The Forgotten Genius of Norman Z. McLeod Essay Example for Free

The Forgotten Genius of Norman Z. McLeod Essay â€Å"He was a very nice guy and a fairly good director,† said Groucho Marx of comedy director Norman Z. McLeod, â€Å"but no genius. † Norman Zenos McLeod helmed three of the most popular comedy films of all time and yet his name is practically forgotten nowadays. He is not as famous today as, say, Howard Hawks, Preston Sturges or even Frank Capra. He didn’t win any Oscars, nor is he the subject of any film introspective or intimate biography. Neither is his directorial style discussed in any lengthy review by Roger Ebert or any other reputable authority on film. But McLeod’s name is up there with the other greats of his era and his legacy seemed to have endured in many of his movies. McLeod was born in Grayling, Michigan from a family that had no connections at all to show business. Before he discovered the movies, he spent two years fighting World War I in France as a fighter pilot in the US Army. McLeod became an animator before he even discovered that he could direct in the movies. He learned the comedy trade at the Christie Film Co. , which specialized in comedy shorts. His first full-length film was the 1928 silent film, Taking a Chance. McLeod was working for Paramount when he directed the Marx Brothers in two movies, Monkey Business and Horse Feathers, which today are considered two of the team’s best. Horse Feathers especially show the Marx Brothers at their wackiest and most anarchic. The material for the movie was based on the brothers’ stage act, which means that before it was ever brought to film it was already familiar stuff for its actors. They only had to transfer the action in front of the camera and on celluloid, so to speak. It is not easy to imagine anyone directing the incomparable Marx Brothers on stage and on film but McLeod did and he seemed to have done a very good job at it, too. Critics, however, are somewhat contemptuous of his abilities, calling him a Paramount â€Å"functionary† and â€Å"a specialist comedy director†. Matthew Coniam in his blog â€Å"The Marx Brothers: Council of Britain† said of McLeod: Norman Z. McLeod does not enjoy much of a reputation per se. He reminds me of that line in one of the Sherlock Holmes stories, where the great detective tells Watson: â€Å"Some people, without possessing genius, have a remarkable power of stimulating. † For a comedian’s director like McLeod, praise rarely comes any higher. After all, there’s something innately ludicrous about the notion of anybody actually directing the Marx Brothers or WC Fields. But both acts could make bad films, and certainly did when not properly handled. Meanwhile, Monkey Business, Horse Feathers and It’s a Gift (1933) have no business outside of anybody’s list of the twenty greatest comedies ever made, and all three have Norman McLeods name on the dotted line. What did he have that many of their other directors lacked? He didn’t try to impose his personality to the detriment of theirs and – a rarer gift than you might think – he obviously got all the jokes. (15) McLeod certainly got all the jokes. And one of them was that you don’t attempt to direct a great talent like the Marx Brothers you simply give them enough space to move and allow them to do their own wacky and hilarious stuff without interference. And that’s exactly what McLeod did in Horse Feathers. Horse Feathers makes no more sense than a Saturday Night Live episode. But the movie does revel in anarchy, reams of it, and elevates the non-sequitur as close to an art form as it can get. It is filled with Grouchos special brand of humor (e. g. , â€Å"Why don’t you go home to your wife? I’ll tell you what, I’ll go home to your wife and, outside of the improvement, she’ll never know the difference,†) and features the very popular song â€Å"Everyone Says I Love You†, which was sang in three different versions in the movie by Zeppo, Chico and Groucho. Harpo, of course, hummed a version of it in his ubiquitous harp. For most of the time, McLeod keeps the camera trained on his actors and then gets out of the way. He did manage some well staged moments in the finale, where the boys win the football match by driving a make-shift chariot on the track. Most importantly, McLeod kept the pace from flagging, even during the Zeppo sequences, (Zeppo as usual played the straight man to his brothers) with the result that there’s hardly a wasted moment in the film. The movie is also pure, unadulterated Marx Brothers without influence from anyone. It resembles a wide, open canvass where the figures of Groucho, Chico, Harpo and Zeppo moved in perfect synchrony, alert and pro-active to each other’s movement and dialogue. And McLeod’s ever-present camera never fails to capture this synchrony, nor the twitches in Groucho’s eyebrows when he utters a joke. The Swordfish scene, for example, is a master combination of both action and framing. It is easy for a director to intrude and even improvise on the scene to make it funnier but McLeod’s camera remained unobtrusive throughout, allowing the actors the liberty to shine and the audience full appreciation of the lively action on the screen. The camera never shifted from actor to actor but held steady on all the players, rather like a passive and mute witness even as the scene grew more hilarious by the minute. The style is reminiscent of a Bugs Bunny and Elmer Fudd confrontation scene, which is not surprising given McLeod’s animation background. The director doesn’t interfere with the scene but he instinctively knows when to move back or off as the case may be, which shows he knows the material than he is given credit for. McLeod understands that comedy is a sight gag. If you cut too soon or if you focus on the wrong person, the comedy will fall flat in seconds, which is why Groucho is given the full close-up treatment when he tells the audience they have a choice to leave the theater while Chico does his thing on the piano. McLeod employed the same technique in the pond scene where Groucho sings the third version of the song, â€Å"Everyone Says I Love You†. Any director worth his salt would have given Groucho the whole close-up treatment just to watch his changing expression as he sings to the college widow but McLeod did not, preferring to train his camera between his two players, wholly anticipating the audience’s reaction as the song’s rather racy lyrics is being sung to the diaphanous-gowned and seductively preening presence of the widow on the opposite end of the small canoe. At one point, McLeod’s camera also framed a duck to reinforce the joke then with a sly wink finally settled on a Life Savers candy which Groucho threw at the widow when she fell off the boat into the water. You can almost hear the uproarious laughter the gag must have elicited from the audience. For McLeod, a joke works best when it is supported by visuals caught mid-action by the camera. He employs this kind of visual style in the W. C. Fields movie, It’s a Gift, which he also directed. The story of a henpecked grocer who yearns to own an orange grove in California, W. C. Fields has never been put to better use than in It’s a Gift. The scene where a blind man wielding an unruly cane visits Fields’ store is already a classic. The scene piles visual gag upon visual gag, and ends in an uproarious yet heart pounding sequence of the same blind man crossing a street while police cars, ambulances and a fire truck raced around him on the suddenly busy intersection. Another scene of Fields attempting to sleep on his porch while things and people around him keep him from doing so is an amazing study of both talent and directorial marksmanship. Like his treatment with the Marx Brothers, McLeod didn’t even attempt to reign in the great W. C. Fields but he made sure that same enormous talent is ably supported by an ever increasing mania of visual sights and gags. The scene is priceless in both comic timing and visualization and the movie has often been cited as W. C. Field’s best and funniest picture, undoubtedly one of the greatest, classic comedies ever made. Maybe the reason why McLeod is overlooked by historians and film buffs is the fact that he never wrote any of his materials and his visuals were never fancy but were strictly utilitarian that served the purpose only of the scene at hand. He never experimented with angles or lightings but captured his subjects as they were, making their trademark shenanigans to elicit a laugh. McLeod also worked with the biggest talents and biggest egos in show business. In addition to other classics like It’s a Gift and Monkey Business, McLeod also directed Danny Kaye in the Secret Life of Walter Mitty, the story of another henpecked who escapes the misery of his life by imagining all sorts of exciting identities for himself. Another big talent directed by McLeod is Bob Hope, Mr. Showman himself, whom McLeod directed in The Paleface and Road to Rio. His association with the biggest names in Hollywood of his era could have been a disservice to McLeod. Certainly he knew his talents and he knew comedy and he combined both to perfect effect. But in the end, one doesn’t watch a Norman Z. McLeod movie starring the Marx Brothers or W. C. Fields or Danny Kaye, it was always the top talent first and the director second. In a sense, that was what McLeod did so well, to so totally efface himself that any movie he helmed turned out as a worthy vehicle for the top talent his studio has signed on to. Also, most of his films tapped perfectly into the commercial mood of their times, which is why they were usually popular then and are often forgotten today. Critics also point out that McLeod has very little visual style and seems more competent than inspired. As if his films happened all by themselves and he just happened to be there. He also happened to understand his role in making these movies. For a quiet and self-effacing man like this very unlikely director, that could have been high praise indeed. Work Cited Coniam, Matthew. The Z, incidentally, stands for ‘Zenos’. The Marx Brothers Council of Britain Page 15. 21 May 2009. Blogger. com. http://marxcouncil. blogspot. com/search/label/Norman%20Z. %20McLeod. 3 May 2010.

Cattle breeding: Sanitary practices and perceptions

Cattle breeding: Sanitary practices and perceptions Chapter 1: Introduction Cattle are raised mainly for meat and dairy products in Mauritius. Cattle breeding are an essential component of modern agriculture. According to norms, safe food of animal origin must be free from pathogens and contaminants. There is a need to reduce the risk and if possible, eliminate it at the on the farm stage. Cattle disease compromise animal welfare, reduce productivity and can also infect human beings. Sanitary conditions and perceptions in cattle breeding farms are very important to ensure a better health of the cattle and consumers of the products. The main reason for disease prevention and management for breeders is the gain in productivity. Sanitary conditions are very crucial in the disease prevention and management. The health of the cow and its environment, improperly cleaned and sanitized milk handling equipment, and workers who milk cows and come in contact with milk due to a number of reasons could serve as sources of microbial contamination of milk (Yirsaw A.W,2004). Contaminants in the form of chemical residues are also of concern to public. Controlling the safety of food of animal origin at the primary production stage therefore involves all the measures (implemented at the farm or production unit level) necessary to ensure that these contaminants do not end up in animal products, or, if they do, that their levels do not exceed the maximum permissible levels, notably the maximum residue limits and microbiological criteria set by Codex Alimentarius Commission (OIE, 2008). Many factors influence milk composition and hence the nature and abundance of the microbial load. The conditions of raw milk production, in particular the hygienic practices of farmers (e.g washing of milking equipment an d pre and post milking udder preparation), determine the contents in useful products and spoilage microorganisms (lafarge V et al, 2004). Henceforth, this case study of dairy cattle breeders, help in meeting the following objectives of the project. The main objective of the study is to assess sanitary practices and perceptions in dairy cattle breeding farms. The specific objectives are: To assess the sanitary milking practices in dairy cattle breeding farm through pre-milking teat disinfection, foremilk rejection and post-milking teat disinfection. To investigate on sanitation practices in dairy cattle breeding farm through practices of cleaning and sanitizing milking equipment. To assess level of awareness on mastitis and sanitary conditions at farmers working place. To evaluate responses based on survey questionnaire on sanitary practices and perceptions on dairy cattle breeding farms. Chapter 2: Literature Review Evolution of dairy cattle breeding Mauritius is categorized as a net food importing country. The dairy production contributes negligibly to the countrys economy with only 2% local milk production (AREU, 2007). According to Milliken (1986), there were about 22,000 milch cattle in 1914, representing a little more than 50% of the total cattle herd at this time (Heera MK, 2008). However the number of cattle head and farmers has been steadily declining over the years, leading to the current situation of only 7150 heads for 1758 breeders (CSO, 2008). Traditionally, the dairy industry in Mauritius was dominated by backyard producers, mostly women. But many of them abandoned farming in the 1980s to take higher paid jobs in the textile and clothing manufacturing industry (Ackbarally N, 2009). Simultaneously the sanitary problems (number of complaints due to lack of sanitation) and diseases, poor management also accounts for the decline. Food crisis in relation to dairy cattle rearing The food crisis which has hit with alarming speed and force the planet over the past recent years has showed how vulnerable net importing countries, like Mauritius, are against such situation. The milk (UHT and powdered) import bill has increased from Rs 975 M in 2001 to Rs 1.8 billion in 2007, representing a 85 per cent rise, while the import volume has remained unchanged (around 17,500 tonnes) (Anon, 2009a). Since the early 1980s milk consumption has grown more than 3 percent per year in developing countries and is projected to grow even faster through 2020. Meat consumption has been growing about 5 percent per year and is expected to grow 2.7% per year through 2020 compared to a low 0.6% per year in rich countries (Zessin K.H, 2002). Hence in response to the global rising food prices and shortages, the government is implementing measures to foster local production of milk and meat to mitigate, in short and medium term, the dependency of the country on imported food commodities. To stimulate dairy production, the government has introduced a battery of grants and loans to purchase equipment, import improved genetic breeds and acquire land for grazing (Ackbarally N, 2009). Importance of Sanitation in dairy cattle breeding farm Sanitary condition is defined as the state of sanitation whereby sanitation is the formulation and application of measures designed to protect public health (wikipedia). The cattle breeding are often viewed as a lucrative opportunity. There are nevertheless a series of complications which may arise during such an event if proper hygiene and sanitation is not maintained. When it comes to sanitation at farm, it is closely linked with Food safety which is now universally recognized as a public health priority. There are a series of precaution that can be taken by farmers, right at the first stage of the food chain, to optimise the food safety control of products of animal origin (OIE, 2006). This inevitably means controlling the health status of the animals from which food products are derived. World organization for animal health (OIE) In this age of globalisation, ensuring healthy, hazard-free food is one of the key issues for international organisations working in this field. To this end, the World Organisation for Animal Health (OIE), the Food and Agriculture Organization of the United Nations (FAO), the World Health Organization (WHO) and the Codex Alimentarius Commission (CAC) work closely together, each in its area of competence (OIE, 2008). Since 2002, the OIE has had responsibility for animal production food safety. The renewed importance conferred by the Sanitary and Phytosanitary measures (SPS Agreement) to the OIE and to WHO/FAO has spurred the interest of countries around the globe (Zessin K.H, 2002). Preliminary Environmental report Cattle rearing do have certain direct and indirect impacts on the environment which require special attention while setting up a farm. Those impacts are mostly associated with solid and liquid waste originating from the farm such as; wastewater from cleaning activities, urine, and manure. Other problems such odour nuisance and flies nuisance are not to be omitted. In case the farm is near residential areas, consultation with neighbours and all other bodies who are likely to be affected by the farm is compulsory. According to Environmental Protection Act 2002, livestock rearing on a scale of up to 20 heads require a Preliminary Environmental Report in which all the environmental and socio-economic parameters are addressed and their impacts are identified and taken into account in the project design (Anon, 2009b). Dairy cattle breeding There are mainly three types of farms in Mauritius. These are: Small Scale farms Locally cattle breeding are more of a family business. Cattle rearing are carried out in a traditional manner in the backyard as a part time activity. The small cattle breeders also known as cowkeepers mostly live in the country side and they own on average two to three lactating cows that are kept in enclosed shed(RATES, 2004). The level of inputs and management vary greatly among the farmers and they are generally low because of limited facilities and lack of financial resources. Medium Scale farms Medium scale farm is quite similar to small scale farm. However they have slightly better management practices in terms of inputs (e.g. better feeding system) and modern techniques are applied e.g. use of milking machine ( Ackbarally N, 2009). Large Scale farms Presently there are two private farms namely Golden Cream Dairy farm ltd at Salazie and SKC Surat Co Ltd at Rose-Belle who are operating at large scale for commercial milk production. Another type of large scale farms which have almost ceased to exist is the Government Dairy farm. In the past there were three Government dairy farms that would keep around 200 head of cattle. Richelieu Livestock Breeding Station (RLPU) has been converted into a quarantine station and recently the Palmar Livestock Breeding Station has been closed. Presently there exists only the Curepipe livestock Research station where other species of livestock are also reared with the main objective to carry out research and development activities in livestock production and training for the benefit of farmers. Guiding objective for good dairy farming practice The guiding objective for good dairy farming practice is that milk should be produce on-farm from healthy animals under generally accepted conditions. This is achieved by applying good agricultural practice in the five areas. Health Management Cows that produce milk need to be healthy and an effective health care programme should be in place. Animal health care includes different veterinary treatments given to the animals for early detection of diseases, prevention of disease spread among healthy animals, prevention of transmission of zoonoses and to ensure traceability (FAO/IDF, 2004). It is important to have strict control of any animal introductions to prevent the movement of the infectious diseases onto the farm. Sick animals are liable to be a major source of disease to healthy animals and hence need to be segregated to reduce the chances of diseases spreading. In case where animals are imported or brought from other local farms, they need to be kept in isolation from the existing herd for about 30 days. This is done again to prevent contamination of existing herds by parasites and pathogens (AREU, 2004). Other activities such as vaccination and deworming schedules, hoof management and routine health assessment form p art of a good Health Management. Guidelines to be followed for effective housing of cows Dairy housing systems have a substantial impact on the overall health and longevity of dairy cattle (Barberg A.E et al, 2007). In addition to keeping animals healthy, a critical part of husbandry is also to make sure they are kept visibly clean. It is of particular importance, to reduce the possibility of contamination of the food, for milking animals and for animals destined for slaughter not to have dirty outer coats. A major influence on the cleanliness of the animals is the type of housing, the material used as bedding and the underfoot conditions if the animals are kept outside (A M Johnston, 2000). Where cows are kept indoors it is important that suitable and adequate buildings be provided if the cows are to be fully productive. Good dairy farm buildings are extremely important in considering any of the hygienic aspects of milk handling (WHO, 1962). The design of the housing system is also important so that there is adequate space and facilities to optimize feeding, collection of manure, cleaning, washing, artificial insemination. The housing system can be either loose or tied system with adequate space and facilities to optimize feeding, collection of manure, cleaning, washing, artificial insemination and milking (AREU, 2007). Layout The general layout of a dairy farm should be according to the number and category of animals to be housed. The cowhouse is a specialized building which should be carefully designed and constructed so as to provide comfortable and healthy housing for the cows and at the same time to enable them to be milked in clean conditions. Housing must be managed hygienically to avoid soiling of animal. A standing of 1.5m long has been found most suitable to enable cows to lie clean, but with the smaller breeds of cow 1.4m or less may be sufficient (WHO, 1962). Moreover it should be free of obstruction and hazards; dead ends, and steep and slippery pathways should be avoided. It should be resistant to adverse weather conditions and consequences thereof especially cyclones, unseasonal change causing cold or heat stress (FAO/IDF, 2004). The windows should be fitted with hinged shutters to be used in case of cyclonic conditions. Floor The floor should be non-slippery to minimize slipping and bruising due to rough uneven floors. Unsuitable floors may inhibit mounting or lead to injuries during mating. The floor should be preferably sloping 10 cm above surrounding ground to enable drainage of urine in a canal leading to a suitable point of disposal as required by the Sanitary Authority (AREU, 2007). Wall Plastering of the wall to a height of at least 1.5m is recommended to prevent accumulation of dirt, disease germs and to facilitate cleaning (WHO, 1962). Cowshed should be provided with at least two doors, one opening on the feeding passage and the other one on the manure cum milking passage. Ventilation and lighting The regular renewal of the air in a cowshed is essential for the maintenance of the health of the cows and prevention of contamination of milk (WHO, 1962). The cowshed should have sufficient openings to allow natural ventilation and adequate sunlight. This will enable proper supply of fresh air to remove humidity, allow heat dissipation and prevent build-up of gases such as carbon dioxide, ammonia or slurry gases (FAO/IDF, 2004). Direct sunlight helps to keep the shed dry and would act as a germ killer. Water Supply Water supply plays an imminent role in maintaining a proper sanitary balance in breeding farms. Besides being used for drinking purpose, efficient water supply helps in cleaning and other activities leading to part of proper sanitation. The cow needs a lot of water (up to 50L daily) to be able to produce saliva for rumination and milk production. It is best to allow the animal continuous access to ample fresh and clean water (AREU, 2004). Water is an obvious potential source of pathogens because it can contain nutrients from feed or manure and be contaminated with pathogens, thereby serving as a vehicle to contaminate or infect animals on consumption (CAST, 2004). E. coli 0157:H7 is found commonly in water troughs on farms and feedlots and persists in these environments for as long as four months (Lejeune J.T et al, 2001). Water supplies should be clear and free of excrement (FAO/IDF, 2004). Feed Management For healthy living and proper growth, reproduction and milk production, dairy cattle require a daily balanced diet. The feed contains nutrient namely carbohydrates, fat, proteins, minerals (e.g. calcium, phosphorus) and vitamins (A, D, E, K). Moreover, foodstuffs which are fed to animals must be free from both pathogens and undesirable residues. Since Mauritius is mainly based on a zero-grazing system, breeders have to make provision for forage based on a cut-and-carry fodder system. The source of forages varies among breeders; they are collected from Sugar Cane Estates or along roadsides, fallow lands, riverbanks, and state lands or vegetable fields (Heera M.K, 2008). Withholding periods should be applied to forage crops if they have been treated with agricultural chemical, prior to use as feed. Control storage conditions of feed The different control measures in relation to feedstuffs and its storage are as follows: Feeds intended for different species should be separated. No animal material should be included in dairy cattle feed rations. Appropriate storage conditions should be ensured to avoid feed contamination. It should be ensured that animals are not able to come into contact with contaminants in areas where these feed products are stored and mixed. Hay and dry feeds should be protected from a moist environment, silage and other fermented crops should be kept under hermetically sealed conditions(AREU,2004) Moldy feed should be rejected (FAO/IDF, 2004); feeding of any moldy stock feed to milking cows should be avoided. Particular care should be taken with wheat bran, silage, hay, bagasse, cotton seed cake as these contain poisonous fungal toxins that can be transferred to milk. Fungal mycotoxins may also be present in pasture. In New Zealand, the ingestion of saprophytic fungus containing the toxin, sporidesmin, causes the disease facial eczema with impaired liver function, photosensitivity, decreased milk production and sometimes death (Ferraud C, 1995). Although the disease is uncommon in other temperate countries, it is important to realize that increased forage use carries the risk of an increased incidence of pasture borne mycotoxicoses. Milk Milk plays an important role in our daily diet. Cows milk contains a wide array of key nutrients that help support human health. It is an excellent source of protein, calcium, potassium and phosphorus. Apart from being a nutritional food, milk has a high water activity, moderate pH of 6.4 to 6.6 and ample supply of nutrients, making for an excellent medium for microbial growth. There is wide spectrum of bacteria present in nature which can contaminate milk rendering it unsafe for human consumption or unfit for further processing. Human pathogens known or likely to contaminate raw milk Microorganisms are widely present in animals and in their environment. Disease in animals is inevitable on farms, no matter how good the husbandry (Johnston, 2000). The diseases that form the greatest threat to animals are caused by microorganisms that invade the body. Diseases could be infectious (of viral or bacterial origin), non-infectious (caused by parasites) or metabolic (caused by imbalanced diet). Specific infectious diseases are generally restricted to the large farms and metabolic diseases are more commonly seen in cattle belonging to small breeders (Sibartie D, 2001). Healthy dairy cattle are considered a reservoir for several of the most important food borne human disease pathogens (Tauxe, 1997). Nontyphoidal Salmonella spp. and Campylobacter jejuni are considered important treats to food safety because of the enormous number of illness they cause. Cattle have been shown to carry Salmonella at rates as high as 64% (CAST, 2004). Listeria monocytogenes and Escherichia coli 0157:H7 are priority pathogens because of the severity of symptoms associated with infection and because of the number of deaths that occur in infected people. All of these pathogens are shed in cattle feces and can contaminate dairy farm premises including unpasteurised bulk tank milk (Ruegg P.L, 2003). Milk borne diseases Human-health threats from livestock come in two basic forms: (i) zoonotic diseases, and (ii) food-borne illnesses. Zoonotic diseases are those that arise in animals but can be transmitted to humans. Potentially pandemic viruses, such as influenza, are the most newsworthy, but many others exist, including rabies, brucellosis and anthrax (FAO 2009). A joint FAO/WHO Expert Committee (1970) on milk hygiene classified milk-borne diseases: infections of animals that can be transmitted to man: Primary importance: Tuberculosis, Brucellosis, Streptoccocal infections, ;Staphyloccocal enterotoxin poisoning, Salmonellosis, Q fever. Lesser importance; cowpox, Foot and mouth disease, Anthrax, Leptospirosis and Tick-borne encephalitis infections primary to man that can be transmitted through milk: Typhoid and paratyphoid fevers, Shigellosis, Cholera, Enteropathogenic Escherchia coli, Non-diarrhoeal diseases, Streptococcal infections, Staphylococcal food poisoning, Diphtheria, Tuberculosis, Enteroviruses and Viral hepatitis (Kamalam S, 2005) Outbreaks associated to milk Warnings to consumers about the risks of drinking raw milk have been stepped up over recent years because health professionals are trying to protect health and have seen a resurgence in milkborne diseases that had dropped dramatically with pasteurization, as raw milk has become trendy and its marketing has increased (Szwarc S, 2009). Mastitis Worldwide, mastitis is the most common disease in dairy cattle (Tan et al, 2009). Mastitis is defined as an infection of the udder, caused by bacteria entering the quarter through the teat end. According to the US national mastitis council(1996); mastitis is an inflammation of the mammary gland in response to injury for the purpose of destroying and neutralizing the infectious agents and to prepare the way for healing and return to normal function ( Fadlelmoula A.A, 2007). This results in physical, chemical and microbial changes in the milk. It can be caused by a variety of bacteria or even fungi, the most common in Mauritius being Staphylococcus epidermidis (Sibartie D, 2001). Mastitis in dairy cattle represents a disease problem which is difficult to prevent or control effectively, since so many different workers have pointed out special instances which indicate that the susceptibility to mastitis manifested by related animals might have genetic basis: various studies have given heritability estimates for mastitis resistance ranging from 0.05 to 0.38 (Warwick E J et al, 1979). Principles of mastitis control Worldwide, farmers have achieved tremendous success in reducing the incidence of contagious mastitis by adopting five basic principles of mastitis control (Ruegg P.L, 2003): Postmilking teat disinfection Universal dry cow antibiotic therapy Appropriate treatment of clinical cases Culling of chronically infected cows Regular milking machine maintenance Sources of contamination of raw milk There are several principal sources of contamination of milk. From the time the milk leaves the udder, until it is dispersed into containers, everything with which it comes into contact is a potential source of more microorganisms. Within the udder Healthy Udder For many years, it was believed that milk drawn directly from the udder of a healthy cow was a sterile fluid, that is, it contained no living microorganisms (Yirsaw A.W, 2004). In healthy cows, many microorganisms resides in the teat cistern, teat canal and teat apex. Natural flora within the udder of healthy animals is not considered to contribute significantly to the total numbers of microorganisms in the bulk milk, nor the potential increase in bacterial numbers during refrigerated storage (Murphy S.C et al, 2000). The first few streams of milk from each teat should be collected, separated, discarded. This flushes out the organisms that entered the teat through the teat opening (FSA, 2006). Unhealthy Udder In cows having mastitis, the infected udders can shed lots of microorganisms into the milk. Selim and Culor (1997) found that Streptococci and coliforms are the most dominant isolated bacteria from milk followed by Staphylococcus spp (Yagoub S.O et al, 2005 ; Murphy S.C et al, 2000). Exterior of the udder Usually the microorganisms from the skin of the animals and the microorganisms from the environment where the cow is kept and milked cause contamination to the exterior of the udder. Common organisms associated with the bedding materials are staphylococci, streptococci, coliforms, spore formers, and other gram-negative organisms (Murphy et al, 2000; Elmoslemany A.M, 2009). Surface of milk handling and storage equipment The most important factor affecting the total bulk milk bacteria count is the cleanliness of the milking system. Utensils and equipment are known to be the greatest sources of contaminants. They may account for as much as 100,000 to billion organisms per milliliter (Murphy S.C et al, 2000). Pails, strainers, milking machines, cans, pipes bottles, and other equipment used for the handling of milk are sometimes not properly washed and sanitized. Organisms survive in the cracks, corners, crevices, dents, scratches and other irregularities of the utensils. Such neglect affords ideal conditions for the growth of microorganisms before the utensils are being used again. Refrigeration is also essential to prevent or slow the growth of bacteria in raw milk. Sanitary practices The consumers are nowadays well conscious about food hygiene and they demand high standards of milk quality. Hence it is fundamental that breeders respect the quality criteria of their product to satisfy the demand and to remain in competition. Milking performed under strict hygienic conditions, with strict attention to sanitary practices, will reduce the entry of microorganisms into the milk. Naturally the fewer the organisms that get into the milk, the fewer have a chance to grow. Personal hygiene of milk handler At all stages hygiene is necessary to prevent contamination of milk. This starts from the person first handling the milk that is the milker and all throughout its handling. It is the responsibility of the milker to follow strict level of personal hygiene to prevent direct contamination of the milk. Personal hygiene of milk handler includes the following (CAC, 2004): The milker should be in good health; those with an open wound or suffering from any skin disease or any other contagious disease should not come in contact with the milk. Any injury on hands or forearms must be covered with a water-resistant bandage. He should possess a valid food handler certificate issued by Sanitary Authority Effective washing of hands and arms with proper means; adequate clean water, soap, nail brush, and thereafter drying hands and arms with a clean cloth or disposable paper towel. He should properly trim nails and must not wear ring or any other jewelry so as not to injure the udder or teats. Neat appearance; wearing clean clothes, hair cap to cover hair. Smoking is not permitted in areas for milking, and milk storage (FSA, 2006). Pre-milking practices A good milking technique is essential for the production of safe raw milk. Cleaning of teats before milking is important to remove both visible soiling (e.g. feces, bedding, mud, residual post milking disinfectant) and bacteria which could contaminate the milk. Washing with water gives the cleanest udder, teat and flank. The water should be between 200C to 400C. Long hairs from the flank and udder should be removed regularly. The wet udder should be dried with paper towel which should be used only once to prevent the spread of bacteria and other pathogens to other cows. If paper towels are not available, sterilized cloth can be used but should be replaced regularly. Thorough washing and drying may be followed by treating with disinfectant (e.g. sodium hypochlorite solution or Dipal), an approved pre-dip solution which must be effectively removed before hand milking or cluster attachment. The use of predipping using iodine has demonstrated to reduce standard plate count and coliform c ounts in raw milk by five- and six-fold respectively as compared to other methods of premilking udder preparation (Galton et al, 1986). The overall reduction of microbial loads in raw milk through the use of predipping should result in reduced numbers of zoonotic pathogens. Predipping has been shown to reduce the risk of listeria monocytogenes in milk filters by almost four-fold (Ruegg, 2003). Foremilk rejection Before the real milking can start each quarter should be inspected for physical/chemical/organoleptic abnormalities by checking the foremilk. The first milk should be spread on a dark surface, a foremilk cup or a dark tile. Abnormal milk shows discoloration, flakes, shreds, clots, blood spots and/or wateriness (Bonnier et al, 2004). If the milk shows such warning signs then the milk should be kept aside because of the risks to humans. The examination of milk must also be done before attaching milking units. Fore-milking assists early detection of mastitis removes potentially contaminated milk from the teat canal and stimulates milk let down. Cows with infected udder (mastitis) and those under treatment with antibiotics should be milked last and the contaminated milk disposed of properly (FSA, 2006). Post-milking practices After fore-milking the milker will be aware if milk quality is satisfactory or not. If milk is free from warning signs, milking of the healthy udder can carried out for human consumption. To milk the cow clean, dry hand must be used and the whole hand should be used instead of only thumb and forefinger because the latter grip is considered bad for udder health and flow rate (Bonnier et al, 2004). Equipment used during milking As soon as milk comes out from the udder it gets into contact with the surface of the recipient vessel for example bucket/pail or aluminium can. Surfaces are usually metal, stainless steel, tinned steel or plastic and they should all be kept in good hygienic conditions. Nowadays Stainless Steel is used as the material of construction for Dairy and Food processing equipments world over to achieve the most exact requirements for easy maintenance, sanitation, product preservation, corrosion resistance and to avoid health hazardous effects of aluminium and plastic (http://www.busiverse.com/dairyproducts). The design of milking equipment, where used, and cans, should ensure there are no crevices or recesses that can interfere with proper cleaning (CAC, 2004). Chapter 3: Methodology Data collection Data collection was done by carrying out a questionnaire based survey. The questionnaire assessed the various sanitary practices and perceptions on the dairy farms. Desk study of recent reports on cattle breeding sector was also conducted to get relevant information on the topic. Moreover key informants like the Agricultural Research Extension Unit situated at St Pierre and the Veterinary Service Division at Reduit were approached. An appointment was fixed through contacts by email and phone call. After interviewing the concerned party, an idea of the current situation as concerned the cattle breeding of the livestock sector was obtained. The names, contact numbers and addresses of the dairy cattle breeders around the island were obtained. Statistical data was obtained from the government website of central statistic division. Questionnaire design The study was based on questionnaire survey among the dairy cattle breeders. While designing the questionnaire, the data collected was considered. The survey covered both management practices used on the farm and it was also composed of questions regarding beliefs and opinions about selected dairy breeding farm issues. The questionnaire consisted of different parts namely the sanitary condition of the cowshed, Pre-milking practices, post milking practices, and animal health. The types of questions used were mainly close ended type and only a few open ended. Sample size The sampling population was the dairy cattle breeders in Mauritius. It is obvious that the whole population cannot be surveyed, thus a total of 26 breeders were randomly selected using random numbers from a sampling frame that included addresses of all dairy cattle breeders registered by AREU. The her

Transition Elements And Coordination Compounds Biology Essay

Transition Elements And Coordination Compounds Biology Essay As we know, Manganese is found in the first row of transition metal with the electron configuration [Ar] 3d5 4s2. Besides that, Manganese has different type of oxidation states when it appears as a compound and the oxidation state is from Mn(-III) until Mn(VII). So, we know that the compounds of manganese range in the oxidation number have a different of 10 electrons. In the experiment 1, we prepare tris(acetylacetonato)manganese(III), Mn(acac)3 by using manganese(II) chloride tetrahydrate and potassium permanganate act as oxidation agent to oxidise manganese(II) chloride to acetylacetonemanganese(III). Manganese(III) acetylacetonate is an one- electron oxidant. Manganese(III) acetylacetonate is high spin. It has also a distorted octahedral structure. This distortion is due to the Jahn-Teller effect. (Absolute Astronomy, 2009). The structure of Manganese(III) acetylacetonate is shown as below:- (Source: Tcieurope.com) The equation is as follow:- MnCl2 + 4H2O Mn(H2O)4Cl2 Mn(H2O)4] Cl + 2HC5H7O2 + NaC2H3O2 Mn(C5H7O2)2 + NaCl + HC2H2O2 4Mn(C5H7O2)2 + KMnO4 + 7HC5H7O2 + HC2H3O2 5Mn(C5H7O2)3 + KC2H3O2 + 4H2O Furthermore, bis(acetylacetonato)oxovanadium(IV) is also known as Vanadyl acetylacetonate, VO(acac)2. As we know, it is a blue green complex. bis(acetylacetonato)oxovanadium(IV) has a vanadyl group, VO2+. The vanadyl group is bonded to 2 acetylacetonate anions and the structure of the compound is as follow:- This complex can be made from vanadium(IV) or vanadium(V). In our experiment, bis(acetylacetonato)oxovanadium(IV) was prepared from vanadium(V) oxide and the equation is as follow:- V2O5 + 2H2SO4 + EtOH 2VOSO4 + 3H2O + CH3CHO VOSO4 + 2HC5H7O2 + Na2CO3 VO(C5H7O2)2 + Na2So4 + H2O + CO2 (Absolute Astronomy, 2009) Besides that, both of the acetylacetonato (acac) groups of bis(acetylacetonato)oxovanadium(IV) are able to be exchanged with organic ligands having coordinating atoms of different potentialities. (Maurya, 2003) Both Manganese(III) acetylacetonate and bis(acetylacetonato)oxovanadium(IV) are bond with acetylacetonate which known as ligand. The precursor for acetylacetonate is acetylacetone with formula CÂ ­5H8O2. However, acetylacetonate is an anion. It can bind to corresponding cation but it very hard to exist as a free ion in solution. In addition, Cobalt is a hard, gray metal. It has a proton number 27. Besided that, there are two types of cobalt ions namely Co2+ and Co3+. First, Co3+ ion is more weaker than the Co2+ ion. However, the complex ion formed with higher oxidation state is more stable. ( Â °zmir Institute of Technology, n.d.). So that, Cobalt(III) complexes are kinetically inert. Co3+ can undergo a process known as ligand exchange reactions slowly which compared to Co2+ complexes. The cobalt(III) complexes are usually in octahedral shape. In the experiment, chloropentaamminecobalt(III) chloride is being synthesized. The structure is as follow:- (Source: Chemicalbook.com) The complex is prepared by the oxidation of ammoniacal solution of cobalt(II) salts by using hydrogen peroxide. The formula is as follow:- Co2+ + NH4+ + 1/2H202 → [Co(NH3)5H20]3+ [Co(NH3)5H20]3+ + 3Cl- → [Co(NH3)5Cl]Cl2 + H20 ( Â °zmir Institute of Technology, n.d.) Materials and Methods : Experiment one 5g of MnCl2.4H20 1.3g of NaC2H3O2.3H2O NaC2H3O2.3H2O Dissolved in 200cm3 of distilled water. 21cm3 of 2HC5H7O2 slowly added 1g of KMnO4 Present of two-phase layer Solution A added in with stirring Dissolved in 50cm3 of distilled water. 13g of NaC2H3O2.3H2O Solution B added in Solution A Solution B Dissolved in 50cm3 of distilled water. Heated with 60oC for 30 minutes Complex washed with acetone Solid complex filtered by suction Resultant solution was cooled with ice-cold water Experiment 2 Experiment 3 Recrystallise Results : For experiment 1, from the equation below, I can get the theoretical mass of the Mn(acac)3 solid complex by : Mn(H2O)4] Cl + 2HC5H7O2 + NaC2H3O2 Mn(C5H7O2)2 + NaCl + HC2H2O2 4Mn(C5H7O2)2 + KMnO4 + 7HC5H7O2 + HC2H3O2 5Mn(C5H7O2)3 + KC2H3O2 + 4H2O From the equation, we know that 1 mol of Mn(H2O)4] Cl = 1 mol of Mn(C5H7O2)2. So, 5 g of Mn(H2O)4] Cl = 0.0308 mol is also = 0.0308 mol of Mn(C5H7O2)2. From the second equation, 4 mol of Mn(C5H7O2)2 = 5 mol of Mn(acac)3 0.0308 mol of Mn(C5H7O2)2 = 0.0385 mol. Of Mn(acac)3 So, theoretical weight of Mn(acac)3 = 0.0385 mol X 252.938 g/mol theoretical weight of Mn(acac)3 = 9.7381 g The following shows the method to get our experimental weight: Weight of Sample tube 14. 8180 g Weight of Sample tube + solid complex , Mn(acac)3 18.7785 g So, the experimental weight of Mn(acac)3complexes were 3.9605 g Percentage yield of Mn(acac)3complexes we get was = 3.9605 g / 9.7381 g X 100 % = 40.67 % Next, Magnetic moment of Mn(acac)3complexes were calculated as follow : m = 0.9278g- 0.8193g = 0.1085g Ro= -33 L = 2.4cm R= 1165 (paramagnetic) CBal = 1 X(g) = [CBal X L X (R-Ro) ] / 109 X m X(g) of Mn(acac)3complexes = 2.65 X 10-5 So, Mn(acac)3complexes are paramagnetic FTIR Interpretation of IR spectrum for complexes will be written in discussion. For experiment 2, from the equation below, I can get the theoretical mass of the [Co(NH3)5Cl]Cl2 solid complex by : Co2+ + NH4+ + 1/2H202 → [Co(NH3)5H20]3+ [Co(NH3)5H20]3+ + 3Cl- → [Co(NH3)5Cl]Cl2 + H20 From the above equation, 1 mol of Co2+ = 1 mol of [Co(NH3)5H2O]3+ 12g of Co2+ = 0.0504 mol So 0.0504 mol of [Co(NH3)5H20]3+= 0.0504 mol of [Co(NH3)5Cl]Cl2 Theoretical weight of [Co(NH3)5Cl]Cl2 solid complexes = 0.0504 mol X 250.433 g/mol = 12.6218 g The following shows the method to get our experimental weight: Weight of Sample tube 14. 9285 g Weight of Sample tube + solid complex , 22.3723 g So, the experimental weight of [Co(NH3)5Cl]Cl2 solid complexes = 7.4438 g Percentage yield of [Co(NH3)5Cl]Cl2complexes = 7.4438 g / 12.6218 g X 100 % = 58.98 % Next, Magnetic moment of [Co(NH3)5Cl]Cl2complexes were calculated as follow : m = 0.9264g- 0.8207g = 0.1057g Ro= -36 L = 2.1cm R= -41 (dimagnetic) CBal = 1 X(g) = [CBal X L X (R-Ro) ] / 109 X m X(g) of [Co(NH3)5Cl]Cl2complexes = -9.9338 X 10-8 So, [Co(NH3)5Cl]Cl2complexes are diamagnetic FTIR For experiment 3, from the equation below, I can get the theoretical mass of the [Vo(acac)2(H2O)] solid complex by : V2O5 + 2H2SO4 + EtOH 2VOSO4 + 3H2O + CH3CHO VOSO4 + 2HC5H7O2 + Na2CO3 VO(C5H7O2)2 + Na2So4 + H2O + CO2 From the above equation, 1 mol of V2O5 = 2 mol of VOSO4 2g 0f V2O5 = 0.011 mol = 0.022 mol of VOSO4 2 mol of VOSO4 = 2 mol of VO(C5H7O2)2 Theoretical weight of VO(C5H7O2)2= 0.022 mol X 264.94 g/mol = 5.8287 g The following shows the method to get our experimental weight: Weight of Sample tube 14.8445 g Weight of Sample tube + solid complex , 18.5818 g So, the experimental weight of VO(C5H7O2)2= 3.7373 g Percentage yield of VO(C5H7O2)2= 3.7373 g / 5.8287 g X 100% = 64.12% Next, Magnetic moment of impure VO(C5H7O2)2 complexes were calculated as follow : m = 0.8880g 0.8244 g = 0.0636g Ro= -34 L = 2.5cm R= 72 (paramagnetic) CBal = 1 X(g) = [CBal X L X (R-Ro) ] / 109 X m X(g) of impure VO(C5H7O2)2complexes = 4.17 X 10-6 So, VO(C5H7O2)2complexes are paramagnetic Magnetic moment of pure VO(C5H7O2)2 complexes were calculated as follow : m = 0.8947g -0.8211 = 0.0736g Ro= -33 L = 2.3cm R= 144 (paramagnetic) CBal = 1 X(g) of pure VO(C5H7O2)2complexes = 5.53 X 10-6 FTIR Interpretation of IR spectrum for complexes will be written in discussion. Impure VO(C5H7O2)2 Pure VO(C5H7O2)2 Discussion : Interpretation of IR spectrum for tris(acetylacetonato)manganese(III): Wavenumber (cm-1) Description of bands 2921.1 2959.7 -relative intensity : weak CH stretching of CH3 1593.9 1508.0 -relative intensity : strong -(C=C) stretching -(C=CH) deformation 1387.2 -relative intensity : strong -(CH3)- symmetric C-H deformation 1253.5 -relative intensity : strong -(C=C) stretching -(C-CH3) stretching 1016.8 -relative intensity : strong -(CH3) out-of plane bending 923.2 -relative intensity : strong -(C-CH3) stretching 777.0 -relative intensity : strong -(C-H)deformation 678.1 -relative intensity : medium/ strong -(C-CH3)stretching,(O=C-CH3) deformation -(Mn-O) stretching indicates metal-ligand bond 460.1 relative intensity : weak (C=C) stretching,(C-CH3) stretching -(Mn-O) stretching that also indicatesmetal-ligand bond Interpretation of IR spectrum for chloropentaamminecobalt(III) chloride: Wavenumber (cm-1) Description of bands 3258.0 -relative intensity : strong NH3stretch 1576.2 -relative intensity : medium -degenerate asymmetric NH3stretching 1307.8 -relative intensity : strong -symmetric NH3angle deformation 844.9 -relative intensity : strong -NH3rocking 487.6 -(Co-Cl) stretching indicates metal-ligand bond Interpretation of IR spectrum for impure bis(acetylacetonato)oxovanadium(IV): Wavenumber (cm-1) Description of bands 1556.8 1521.0 -relative intensity : medium (C=O) stretching -( C=C),(C=CH) stretching 1418.7 -relative intensity : medium -(CH3) deformation 1374.0 1357.6 -relative intensity : strong -(C=O) stretching -(CH3) deformation mode 1286.6 -relative intensity : strong -(C=C=C) stretching 998.2 -relative intensity : strong and sharp -stretching of V=O bond -it also indicates the metal-ligand bond. 1018.6 -relative intensity : strong -(CH3) rocking 936.1 -relative intensity : strong -(C-CH3) stretching -(C=O) stretching 798.6 -relative intensity : medium -(C-H) out-of-plane bending 685.9 657.2 -relative intensity : medium/ weak -(ring) deformation out-of-plane bending for: 609.2 -(ring) deformation Interpretation of IR spectrum for pure bis(acetylacetonato)oxovanadium(IV): Wavenumber (cm-1) Description of bands 1563.0 1520.0 -relative intensity : medium (C=O) stretching -( C=C),(C=CH) stretching 1499.6 -relative intensity : medium -(CH3) deformation 1380.0 1349.0 -relative intensity : strong -(C=O) stretching -(CH3) deformation mode 1288.3 -relative intensity : strong -(C=C=C) stretching 995.0 -relative intensity : strong and sharp -stretching of V=O bond -it also indicates the metal-ligand bond. 1018.2 -relative intensity : strong -(CH3) rocking 935.7 -relative intensity : strong -(C-CH3) stretching -(C=O) stretching 798.8 798.0 -relative intensity : medium -(C-H) out-of-plane bending 686.0 -relative intensity : medium/ weak -(ring) deformation out-of-plane bending for: 609.7 -(ring) deformation FTIR is known as Fourier Transform Infrared Spectroscopy. This FTIR can be used to identify different types of chemical bond which is either organic compound or inorganic compound. So no two different compounds will have same spectrum. However, FTIR may cause destructive to our sample compare to magnetic susceptibility which is non-destructive. Besides that, magnetic susceptibility can be group by paramagnetic, diamagnetic and ferromagnetic. Paramagnetic substance is those attracted by strong magnetic field but those repelled by magnetic field are diamagnetic substances. Besides that, we can also confirm the shape by using magnetic susceptibility. The Cobalt ion to form Chloropentaamminecobalt(III) chloride has 6 electron in d orbital. According to crystal field theory, if the complex is in octahedral shape, the electron can be arranged like below:- Low-spin high-spin eg eg t2g t2g If the complex is in tetrahedral shape, the electron are arranged as below:- t2g eg Magnetic Susceptibility for chloropentaamminecobalt(III) chloride is -9.9338 X 10-8 and it is diamagnetic. Only the low-spin octahedral shape shows diamagnetic properties, so the shape of chloropentaamminecobalt(III) chloride is octahedral. Furthermore, for tris(acetylacetonato)manganese(III), the Mn3+ ion has 4 electron in d orbital, and the arrangement in octahedral shape will as follows:- Low-spin High-spin eg eg t2g t2g For the arrangement in tetrahedral shape, the electrons are arranged as below:- t2g eg Magnetic Susceptibility for tris(acetylacetonato)manganese(III) is 2.65 X 10-5 and it is paramagnetic. So the shape of tris(acetylacetonato)manganese(III) is octahedral. However we cannot determine whether is low-spin or high-spin in this situation because we are not calculating the pairing energy for the complex. In addition, there is only one electron in d orbital for vanadium ion of bis(acetylacetonato)oxovanadium(IV). Magnetic susceptibility for it is 4.17 X 10-6 and it is paramagnetic. The shape is octahedral and the arrangement of electron is as follow:- eg t2g Acetylacetonate is delocalized and formed resonance structure as follow : The structure of Co(NH3)5Cl]Cl2 is as follow : The structure of [VO(ACAC)2] is as follow : Moreover, oxovanadium complexes act as insulin mimetics, nucleolytic and anticancer. To recognize insulin- mimetic complexes, a simple and fast in-vitro assay is developed. Besides that, an accurate assessment of the cells taken up of glucose, in-vitro assay with Ehrlich can be used. The oxovanadium complexes can cleave DNA without the present of hydrogen peroxide. Then, its nucleolytic efficiency is also greater but it is affected by the choice of buffer and pH. The oxovanadium complexes is also an anticancer agent against human ovarian cancer. Actually, I have acquired a lot of new knowledge among these three experiments. First, experiment one and two are easier to carry out compared to experiment three. This is because experiment one and two involved oxidation which Mn2+ was oxidized to Mn3+ ; Co2+ was oxidized to Co3+. Whereas experiment 3 involved reduction which reduced VO5+ to VO4+. At the beginning of each experiments, we heated up the sample in open air. It is easier to oxidize the compound than reduce the compound in the presence of oxygen. So, we need more time to heated the V2O5. During the first time of experiment three, I failed to get a blue color solid powder. This is because I heated the sample in the open air and I failed to control the heater. So, after the filtration process, I got a white solid powder. Therefore, I learnt from the mistake and during the second time I used reflux method. This time I can control the heating process well. The ethanol was not evaporated much. After filtration, I got quite a lot of blue solid powder. So, I knew that, for reduction process, we cannot heat the sample too quickly and heat too long. If we heated too long, most of the product will evaporate. Next, from the FTIR spectrum, I can observe that the spectrum from the first and third experiment are quite similar. This is because, the peak from the spectrum are mostly from the acetylacetonato (acac). However, spectrum from experiment two is quite different from other experiment because mostly the peaks come from Cl compared to other experiments. The percentage yield of the complexes from all the three experiment that I have calculate out was not so high. This is maybe due to the washing of the product with acetone, some of the product was dissolved and washed away. However, there are other factors which cause problem to our results. First, most of the heating plate we used cannot function well. I changed many heating plate during the experiment. Next, we have kept our half way done sample for more than 7 days. The results may not be so accurate anymore. Another factor maybe due to the volume and amount of the sample and other material we measure are not accurate. Our product may contain some impurities. However, some of the precaution was taken during the experiment. In these experiments, some of the chemical was corrosive and poisonous such as concentrated HCl and H2SO4. So, we poured the chemical carefully in the fume board. Next, before using any instrument, we read through the manual to understand the steps to function the magnetic susceptibility balance. We also taken down some important steps to function the FTIR spectrophotometer. I have asked some help from lab assistant on where to get the material for experiment. Conclusion : The percentage yield for tris(acetylacetonato)manganese(III) is 40.67%, chloropentaamminecobalt(III) chloride is 58.98% and (acetylacetonato)oxovanadium(IV) is 64.12%. For tris(acetylacetonato)manganese(III), the peak for two Mn-O bond are at the region approximately 678.1 cm-1 and 458.3 cm-1. For chloropentaamminecobalt(III) chloride, the peak for Co-N bond is at 669.2 cm-1 while Co-Cl bond is at 486.2 cm-1. For bis(acetylacetonato)oxovanadium(IV), the peak for V=O bond is at 997.4 cm-1 region. Magnetic Susceptibility for tris(acetylacetonato)manganese(III) is 2.65 x 10-5 and it is paramagnetic. Besides, Magnetic Susceptibility for chloropentaamminecobalt(III) chloride is -9.93x 10-8 and is diamagnetic. For bis(acetylacetonato)oxovanadium(IV), magnetic susceptibility for impure complex and pure complex are 4.17X 10-6 and 5.53X 10-6 respectively. They are paramagnetic.

Fred McFeely Rogers :: Mister Rogers Mr. Rogers

Fred McFeely Rogers Fred McFeely Rogers was born on March 20, 1928 in Latrobe, Pennsylvania. He studied at Dartmouth College in Hanover between 1946 and 1948. Mr. Rogers received his BA in Music Composition in 1951, from Rolling College in Winter Park, Florida. After college, Mr. Rogers studied in the Ministry and intended to preach after he was ordained in 1962, but was diverted by television. Mr. Rogers began working for a local Children’s channel series â€Å"The Children’s Corner.† While working for this local channel, In 1963, Mr. Rogers moved to Toronto where he began working for a Canadian Broadcasting Company and had his debut in â€Å"MisteRogers† In 1966 he received the rights to move the program to Pittsburgh. Here, Mr. Rogers aired his Internationally known â€Å"Mr. Rogers Neighborhood† from 1968 – 2001. Mr. Rogers has received many awards for his television show. He received 4 Emmy awards, 1 for lifetime achievement. He received the Peabody Award in 1983 â€Å"in Recognition of 25 beautiful years in the neighborhood.† Mr. Rogers also received the Presidential Medal of Freedom for Contributions to childrens education. As stated by President George W. Bush at the ceremony, â€Å"Fred Rogers has proven that television can soothe the soul and nurture the spirit and teach the very young.† Not all of Mr. Rogers life was perfect. Throughout his career, Mr. Rogers has faced some criticism and even had some Urban Legends develop. â€Å"I feel the greatest gift we can give to anybody is the gift of our honest self† as put by Mr. Roger. When in fact, that is not how others always viewed him. One of these Urban Legends was the claim that Mr. Rogers had a violent past. Fred McFeely Rogers :: Mister Rogers Mr. Rogers Fred McFeely Rogers Fred McFeely Rogers was born on March 20, 1928 in Latrobe, Pennsylvania. He studied at Dartmouth College in Hanover between 1946 and 1948. Mr. Rogers received his BA in Music Composition in 1951, from Rolling College in Winter Park, Florida. After college, Mr. Rogers studied in the Ministry and intended to preach after he was ordained in 1962, but was diverted by television. Mr. Rogers began working for a local Children’s channel series â€Å"The Children’s Corner.† While working for this local channel, In 1963, Mr. Rogers moved to Toronto where he began working for a Canadian Broadcasting Company and had his debut in â€Å"MisteRogers† In 1966 he received the rights to move the program to Pittsburgh. Here, Mr. Rogers aired his Internationally known â€Å"Mr. Rogers Neighborhood† from 1968 – 2001. Mr. Rogers has received many awards for his television show. He received 4 Emmy awards, 1 for lifetime achievement. He received the Peabody Award in 1983 â€Å"in Recognition of 25 beautiful years in the neighborhood.† Mr. Rogers also received the Presidential Medal of Freedom for Contributions to childrens education. As stated by President George W. Bush at the ceremony, â€Å"Fred Rogers has proven that television can soothe the soul and nurture the spirit and teach the very young.† Not all of Mr. Rogers life was perfect. Throughout his career, Mr. Rogers has faced some criticism and even had some Urban Legends develop. â€Å"I feel the greatest gift we can give to anybody is the gift of our honest self† as put by Mr. Roger. When in fact, that is not how others always viewed him. One of these Urban Legends was the claim that Mr. Rogers had a violent past.

Pollution Essay: Forests Counter-Act Global Warming :: Environment, Climate Change

An important ecosystem service provided by forests is the ability to counter-act the effects of global warming. Carbon dioxide, a contributing factor to global warming, is taken up by the plants and vegetation contained in forests through photosynthesis and the resulting carbon is stored in both living and dead plant biomass. This process, known as carbon sequestration, greatly reduces the potential for global climate change (IPCC 2001). Forest cover also affects the albedo, that is, the proportion of incident solar radiation that is reflected by the earths surface. The dense green coloured canopy of tropical forests have a low albedo when compared with grasslands or deforested areas. This allows for more incident solar radiation to be absorbed and cooler air termperatures (O’Brien 1996). Perhaps the most important ecosystem service provided by forests, which is a basic requirement for life, is the supply of clean water. Forests facilitate the storage of clean water through filtering precipitation through the tree canopy. This, in effect, slows the rate at which precipitation collects at the ground surface allowing it to remain unsaturated. It is estimated that over 2/3 of the clean water supply is United States is contained within stream water, which was filtered through forests, with a direct value exceeding $27 billion per year (Snail 2009). This clean water can be captured and stored in watersheds that in turn, can be used for variety of purposes including agriculture, municipal drinking water, recreational activities and habitat for wildlife. Global forests provide habitat for wildlife, which in turn, contribute to the maintenance of ecological processes. Wildlife is directly utilized by humans for hunting, observation and ecotourism. However wildlife is considered an important ecosystem service because of its indirect contribution to many other ecological processes. Wildlife plays an important role in the pollination and seed dispersal of crops. Eighty percent of the world 1,330 cultivated crop species are pollinated by wild pollinators who typically live in forested regions (Abroamorvitz 1997). Additionally wildlife plays an important role in biologically controlling pest populations, specifically in timber species (Snail 2009). Works Cited Wiersum, K.F. 1984. Surface erosion under various tropical agroforestry systems. In: O’Loughlin, C.L. and Pearce, A.J. (eds.) Proceedings Symposium on Effects of Forest Land Use on Erosion and Slope Stability.

Questions about map

List four questions about map objectives that would influence the design of a map. What am I making this map for and what am I trying to accomplish? Who will be viewing? Why will it be used? Is there privacy issues surrounding the project? 2. What factors should be considered In evaluating the balance of a map? Placement of features, the size of features, alignment of features, usage of space 3. What types of colors generally work best for maps? How can the psychology of colors be used to enhance a map's meaning?Pastels and earth are good for big map areas. Bold colors are good for emphasis. Some things have associations with colors. For example green for plant life or blue for water 4. List three common pitfalls that amateurs make when creating legends. Cryptic filenames, poor formatting of numeric numbers and not adjusting neatness for balance 5. What is a geographic coordinate system, and why is it a poor choice for creating maps? This is a bad method for making maps because of t he distortion the system makes when projecting the map.A geographic coordinate system does this cause it is a system based on a sphere. 6. What four properties are distorted by map projections? Which tend to be preserved by conic projections? What distortions are present in TM and State Plane projections? Area Shape Direction and Distance can all be distorted. TM and state plane are better for small area mapping as they tend to preserve area and distance. 7. Examine the map projections on the inside front cover of this text.List which projection(s) might be suitable for a (a) map of a county, (b) map of the united States, c) United States map used to calculate travel distances, and (d) United States map used to calculate areas. A)= TM or state plane b)= Equidistant Conic or Lambert conformal conic c)= Equidistant Conic d)= Albert Equal Area Conic 8. When does a north arrow not point up? When should a north arrow not be used? If a projection messes up the direction a north arrow cann ot be used as It does not conform with the data. A gratuities grid can be used to show north 9.If you have an Archive license and wish to create and use annotation In different AP documents, how would you need to store It? An annotation Is stored as a feature class In a sedateness. 10. What Is the difference between the map scale, the scale range, and the reference scale? Map scale- Is the ratio of units from the map to the world Scale range- controls the range of the scale at which the features are allowed to appear Reference scale- scale that determines at which symbols or text labels appear at their assigned size CHI GIS By Will-Huber 2. What factors should be considered in evaluating the balance of a map?Placement rejection(s) might be suitable for a (a) map of a county, (b) map of the United States, a projection messes up the direction a north arrow cannot be used as it does not 9. If you have an Archive license and wish to create and use annotation in different map documents, how would you need to store it? An annotation is stored as a feature class in a sedateness. 10. What is the scale= is the ratio of units from the map to the world Scale range= controls the range of the scale at which the features are allowed to appear Reference scale= scale that determines at which symbols or text labels

Pencils Are Better Than Pens – Debate

Pencils are better than Pens Ladies and gentlemen, When you go to war you want to be prepared with the right weapons. Having the wrong ones can limit you success and impair your skills. Isn’t this the same case for writing a paper? When you sit down to write a paper you want to make your ideas flow, to be able to erase false ones, and stay focused; pencils enable you to do all of those things more effectively than pens. Pencils have erasers to fix all your mistakes, they’re 100% organic, and contrary to pens, which can be very messy, pencils are neat and long lasting.When you are writing, you make mistakes all the time. You write words messily, you spell them wrong, and you mix up the order of what you are trying to say. If you are writing with a pen you have to scribble out all of those misspelled words or draw arrows to where you want things to be. When you’re done, it looks like a paper in disarray. If you write with a pencil you don’t have to do any of that. You can erase all of your misspelled words, and neatly move sentences to where ever you want. When you’re finished your paper looks faultless.It has no messy scribbles or long confusing arrows, everything is precisely how you want it to be. Of course scientists have created an erasable pen, but it doesn’t work as well as pencils. Erasable pens can erase, but they normally leave streaks or smudges on the page. You also can’t just use any eraser on it, it has to be a special eraser that costs more than a regular pencil eraser. Pencils are much more affective at erasing and keeping papers mess free. Secondly, pencils are 100 percent organic. They are made up of cedar, graphite, and metal.Which are all organic substances. Pens are made up of plastic and ink. Ink is made up of oil, which is harmful to the earth. Plastic is not organic, and pollutes the environment. Also if you break a pen in half, it is permanently broken, and becomes incredibly messy. Once th ey are broken they end up getting thrown away, and produce more trash. When a pencil is broken in half. All you have to do is sharpen it, and you have two pencils! This then reduces the amount of wasted materials. With that in mind, pens are much messier than pencils. Pencils can’t write n you or other objects besides paper. But pens on the other hand can write on almost any surface. Even when you write, you can smudge it all over your page when its not dry, it gets all over your hands, and it’s very hard to get off of your skin. Once your skin absorbs the ink it can give you ink poisoning. But pencils can’t poison you, or do anything permanently harmful to you, and they are mess free. Lastly, pencils are a very useful and long lasting utensil. According to Dixon Ticonderoga Pencil Company, pencils can draw a line 35 miles long.And according to bicworld. com pens can draw a line 1. 24 miles long. Using one pencil is the equivalent to using 28 pens. One organic p encil eliminates much more waste than 28 pens do. In conclusion, pencils are the prime utensil for writing a paper. Pencils have erasers to erase all your mistakes. They are 100 percent organic, and unlike pens they are neat and long lasting. You don't want to impair your skills nor limit your success, so when you sit down to write a paper, remember to use the better writing utensil, the pencil. Thank you.