be similar to the pictures below. (In these examples‚ the time after plating is different for the two samples‚ so be aware that the colonies in these photos are different sizes for a reason.) We will culture our bacteria for about 2-7 days. Characteristics are most visible if the bacteria are examined using a stereoscopic scope. E. coli Shape (form): circular Margin: entire Elevation: raised Size: punctiform‚ small Texture (surface): smooth Appearance: shiny Pigmentation: nonpigmented (colorless)
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differences between bacteria‚ viruses‚ fungi and parasites. Answer to 1.1 – The difference between bacteria‚ viruses‚ fungi and parasites are: Bacteria – Bacteria is a single celled organism‚ bacteria have evolved to be in any environment and can be found in any substance/surface and also in the human body‚ only 1% of bacteria is actually harmful. It’s bad or infectious bacteria that causes illness as they rapidly reproduce and produce a toxin that kills or mutates cells‚ bacteria is also self-sufficient
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This is because gold is very resistant to bacteria. Bacteria are microscopic single-celled organisms. Bacteria are prokaryotes‚ meaning the entire organism consists of a single cell with a simple internal structure. The DNA of a prokaryote is neatly packed in the nucleus. The bacterial DNA floats freely in a twisted threadlike mass called the nucleoid. Gold is unaffected by almost everything. The only materials that can affect gold are man-made. Since bacteria are a natural organism‚ it cannot react
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Associate Program Material Levels of Life Worksheet Complete all three parts of this worksheet. Part I: Atomic Structure – Fill in the missing information on atomic structure and organic compounds. |Atomic Structure | |Subatomic Particle |Charge |Location in an Atom | |Proton
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able to observe motility? Carbohydrate Fermentation Testing Questions A. What is fermentation? B. Why is it important not to incubate the fermentation tubes beyond 24 hours? C. Why is phenol red added to the fermentation tubes? D. Why do bacteria have differences in the carbohydrates they can ferment? E. Why does the formation of yellow color indicate fermentation? F. What information can be gained by running a fermentation series on a particular microbe? G. What does a dark pink or red
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Application of lactic acid bacteria There are four major categories for the current uses and applications of LAB: food‚ cosmetic‚ pharmaceutical‚ and chemical applications. In food industry Recent years the interest increased in using LAB by using bacteriocin-like inhibitory substances (BLIS) because of their potential use as a natural antimicrobial agent to enhance the food safety of food products and increase the nutritional values of the food. Foods that fermented by LAB such as cheese
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CHAPTER 4: THE ORGANIZATION OF LIFE VOCABULARY LIST DEFINE THE FOLLOWING TERMS FROM THE GLOSSARY: ECOSYSTEM: a community of organisms and their abiotic environment. BIOTIC FACTOR: an environmental factor that is associated with or results from the activities of living organisms (100) ABIOTIC FACTOR: describes the non-living part of the environment‚ including water‚ rocks‚ light‚ and temperature. ORGANISM: a living; anything that can carry out life processes
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INTRODUCTION The enzyme catalase converts hydrogen peroxide (H2O2) to water and O2. The evolution of O2 causes bubbling. Thus‚ catalase-positive organisms that are mixed into hydrogen peroxide will cause bubbling (catalase-negative organisms will not). This test is good for distinguishing between Gram-positive cocci in chains (catalase negative) versus Gram-positive cocci in clusters (catalase positive). The coagulase test is used to differentiate Staphylococcus aureus from coagulase-negative
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diseases can kill many people that are drinking water on the tap water and mostly on the drinking fountain; people might drink on a drinking fountain which is dirty because of the different people that are drinking and spiting their saliva on to it‚ bacteria can easily contaminate the water that is coming out from the drinking fountain. Bacteria’s are also found everywhere in the surroundings; even the sink in our home might have bacteria’s because of the dirty place‚ and in the school also have bacteria’s
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Aims The purpose of the two experiments was to determine the fundamental effects that temperature has on the growth and survival of bacteria. During the first experiment five different bacterial broth cultures of Escherichia coli‚ Pseudomonas fluorescens‚ Enterococcus faecalis‚ Bacillus subtilis and Bacillus stearothermophilus were individually incubated at temperatures of 5‚ 25‚ 37‚ 45 and 55°C for one week in an aim to distinguish the effect temperature has on growth and survival of the five different
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