Population growth in yeast Aim: To study the population growth rate of yeast‚ a microorganism Saccharomyces cerevesiae Variables: | | Units | Independent variable | Time the readings were taken | Hours | Dependent variable | Absorbance (increasing yeast population) | - | Controlled variables | Units | Possible effects on result | The wave lengths | Nanometer | since the transmission and absorbance is being measured at a specific wave length‚ so if we change it the results
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Diagram 1Which of the following microorganisms are growing on the bread? | | A | | B | | | C | | D | | 4. | Which of the following conditions are the most suitable for microorganisms to grow in? | | A | Hot and dry | | B | Damp and warm | | C | Wet and hot | | D | Cold and warm | 5. | Food preservation is a process by which ... | | A | microorganisms are killed. | | B | food is treated so that it will keep. | | C | microorganisms are removed from food. | |
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Probiotics Today‚ there are evidences that probiotic strains used as commercial bacteria are safe to use in applications. The safety of the probiotic products is appraised with the phenotypic and genotypic characteristics and the statistics of used microorganisms (Çakır 2003). Safety aspects of probiotic bacteria include the following requirements. 1. Strains for human use are preferred to be human origin. 2. They are isolated from healthy human gastrointestinal tract. 3. They have to be non-pathogenic
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billion years to a time when the Earth was covered with oceans that regularly reached the boiling point‚ hundreds of millions of years before dinosaurs roamed the earth. The field of food microbiology is a very broad one‚ encompassing the study of microorganisms which have both beneficial and deleterious effects on the quality and safety of raw and processed foods. Food science is a discipline concerned with all aspects of food - beginning after harvesting‚ and ending with consumption by the consumer
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The bacteria that ferment lactose die off as the Ph drops. Salmonella survives because it does not use lactose. The TBGB broth‚ is the second step in isolating Salmonella‚ from other bacteria in the sample. It inhibits the growth Gram-positive microorganisms and some Gram-negative bacilli. Brilliant Green Agar (BGA) isolates salmonella because they do not ferment lactose‚ so they grow red. LIA and TSI confirm if salmonella is growing on BGA. Spinach sample B tested positive during the LIA and TSI
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aerobically with the help of microorganism which in the presence of oxygen degrade the organic matter present in the waste water till the BOD value reaches the acceptable level. This process is known as the activated sludge process this treatment removes. The required bacteria for this process are being grown in a controlled manner by adding M aqua culture .In the first aeration tank diffused aerators are used aerobic digestion of organic matter by the microorganism and urea ‚ DAP is added in all
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2/21/01 Food Irradiation: Solution to Hunger or Killer Mutagen? People all over the world are starving for fresh‚ uncontaminated food. Insects‚ pests‚ and invisible microorganisms are not what the public want to find on their dinner plates. Throughout history‚ life has depended on ways of treating food to reduce or destroy these naturally occurring harmful contaminants and to enable foods to be stored after harvesting so that they can be saved for use at other times of the year. With increasing
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it has a negligible effect on the availability of fixed nitrogen. So‚ nitrogen is often the limiting factor for growth and biomass production in all environments where there is suitable climate and availability of water to support life. Microorganisms have a central role in almost all aspects of nitrogen availability and thus for life support on earth: some bacteria can convert N2 into ammonia by the process termed nitrogen fixation; these bacteria are either free-living or form symbiotic
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Introduction The dirtiest thing you own maybe your cell phone. Imagine what touches your phone the most‚ probably your hands and face. Since cell phones are everywhere and have become one of the most helpful tools of our generation‚ they have their drawbacks. The use of cell phones happens everywhere today‚ one place being the hospital. From a study of phones and spreading of bacteria associated with health care associated infections‚ Karabay states‚ “Our study reveals that mobile phones may
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of the samples were done in uncontrolled environmental conditions. According to the study of Millet and Lonvaud-Funel (2000)‚ the growth of microorganisms in the fermentation of vinegar is affected by the optimum temperature and environment for microbial growth. Based on the result for the microbial identification and isolation of the sample‚ the microorganism that was identified
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