Shantelle Johnson April 8‚ 2012 H4 Introduction When food is unsafe for consumption is called food contamination. Food contamination occurs when foods are spoiled because they might contain microorganisms‚ such as bacteria ‚ parasites‚ or toxic substances that make them unsafe for consumption.Bacteria and parasites on uncooked food can linger on the food if not handle or cooked properly. Food contamination is serious because it results in diseases that affect appromiaxally seventy-six million
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------------------------------------------------- The Processes of the nitrogen cycle Nitrogen fixation Atmospheric nitrogen must be processed‚ or "fixed" (see page on nitrogen fixation)‚ in order to be used by plants. Some fixation occurs in lightning strikes‚ but most fixation is done by free-living or symbiotic bacteria. These bacteria have the nitrogenase enzyme that combines gaseous nitrogen with hydrogen to produce ammonia‚ which is then further converted by the bacteria to make their own organic
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The role of bacteria in the soil Bacteria in the soil play key role in recycling matter in to useful nutrients which can be used by growing plants. This process of recycling matter in the soil by living organisms is called biogeochemical cycle. Bacteria are improving plants growth in other ways too‚ for example bacteria‚ such as Rhizobium‚ are in symbiotic relationship with the root system of some terrestrial plants. The most important elements‚ which allow terrestrial plants grow well‚ are
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bacteria is very resistant to antibiotics‚ and it can lead to sepsis and infection of other body organs‚ another cause is when cultures of infected tissue show a mixture of nonanaerobic bacterial types such as Escherichia coli‚ Klebsiella‚ and Clostridium is a cause if gas is found in the infected tissue. Investigators have concluded that tissues damaged by nonanaerobic to a great extent lead to hypoxia which is a
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outside the human body. It thrives on the back of the nose and throat‚ or in the upper respiratory tract. As such‚ this disease is spread through coughing or sneezing or kissing. 3. Tetanus Tetanus is caused by a toxin produced by the bacterium Clostridium tetani. This disease cannot be spread from person to person but the bacterium is present in the soil‚ in the intestines and feces of household and farm animals as well as human excretion. It is a dangerous disease as it attacks the nervous system
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gastroenterologist. They can perform a variety of tests that include “complete blood count (CBC)‚ erythrocyte sedimentation rate (ESR)‚ C-reactive protein (CRP)” (Riley Children’s Health 1) which are blood tests. “Hemoccult‚ calprotectin‚ culture‚ clostridium difficult (C.diff)” (Riley Children’s Health 1) which are stool tests. “Small bowel barium x-ray‚ ultrasound‚ computed tomography (CT) scan‚ magnetic resonance imaging (MRI) which are a variety of imaging studies (Riley Children’s Health
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are introduced to the products (Hossain et al.‚ 2010; Thi et al.‚ 2013). It has been found that the initial biota of herring fillet are dominated by Shewanella putrefaciens and Pseudomonas species. In addition‚ E. coli‚ Staphylococcus aureus and Clostridium perfringens have been identified from raw frozen seafood. A prevalence study of Aeromonas on catfish in a processing plant showed the predominance of Aeromonas and Pseudomonas spp.‚ Staphylococcus aureus‚ faecal coliform‚ E. coli and Salmonella
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L’eau : Un enjeu stratégique majeur au Proche Orient Les hommes d’Isaac creusèrent dans le lit sec du wadi et y trouvèrent un puits d’eau vive. Le berger de Gerar se prit de querelle avec le berger d’Isaac en disant : "Cette eau nous appartient". Isaac appela le nouveau puits Eshek (querelle) puisqu’il s’était querellé avec le berger. Puis il creusa un nouveau puits ailleurs et ils ne se querellèrent pas à son sujet. Aussi l’appela-t-il Rehovot (spacieux). Il dit : "Il est sûr que l’Éternel a
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ISC Board Important Questions Biology [Set-1] Q1. a) (i). Absorption spectrum and Action spectrum Answer: A curve obtained by plotting the amount of absorption of different wavelengths of light by a particular pigment is called absorption spectrum of that pigment. An action spectrum is a curve showing the effectiveness of different wavelengths of light in stimulating the process being investigated. (ii). Heart Wood and Sap Wood Answer: In most trees the outer light colored region of the wood
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Microbial Mechanisms of Pathogenicity Mechanisms of Pathogenicity • Pathogenicity: • Virulence: Mechanisms of Pathogenicity Figure 15.9 Portals of Entry • Mucous membranes • Skin • Parenteral route Numbers of Invading Microbes • ID50: Infectious dose for 50% of the test population (animals) • Dose of pathogen that will infect half of the test animals • LD50: Lethal dose (of a toxin) for 50% of the test population (animals) • Dose of toxin that will kill half of the test
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