violet‚ basic fuchsin‚ or methylene blue. Simple dyes used to stain bacteria have a positive charge cationic (+)‚ therefore‚ they are attracted to the bacteria that are usually negatively charged anionic (-) Depends on the fact that bacteria differ chemically from their surroundings and thus can be stained with their environments Simple stains are used to provide contrast between specimen and background Differential Staining Bacteria react differently to the multiple reagents that are used i.e. Gram
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works as a therapeutic agent by destroys bacteria (bacteriocidal): it inhibits cell wall biosynthesis (by disrupting the normal balance between cell wall biosynthesis and degradation)‚ specifically binding to and inactivating enzymes that function to form the cross-linkages of peptidoglycan strands in bacterial cell walls (weakening said cell walls). Since cell wall expansion also requires the action of enzymes that degrade cell walls‚ exposure of growing bacteria to penicillin results in their lysis
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Bacteria Prokaryotic & Eukaryotic Cells 1-7.Bacteria cells reproduce ASEXUALLY BY BINARY FISSION. Asexually means the offspring comes from one parent Draw what Binary Fission of a bacteria looks like: 8. Label the parts of this prokaryotic cell. [pic] 9. Name several structures that are found in eukaryotic‚ but NOT prokaryotic cells. 10. What type of cells are the most numerous on Earth? 11. What are the most common type of prokaryotic cells? 12. How old are the earliest
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Soil Microbe Lab Antibiotics are chemicals produced by substances that kill or inhibit the growth of bacterial cells (Hurney et al 2013). These microbes‚ such as bacteria found in the soil‚ may seem like they would be harmful to the human body because they attack cells‚ however they are very efficient at only attacking the bacterial cells. Actinomycetes are one of the more common groups of these soil microbes known to produce antibiotics. Antibiotics work because they target specific aspects
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1) What are the organisms/entities of study in the field of microbiology? 2) Who was the first human to publish extensive descriptions of microorganisms? 3) How did Louis Pasteur dismantle the theory of spontaneous generation in bacteria? 4) Who established microorganisms as the causative agent of infectious disease? How did he do this? What was the result of this body of work? 5) What are some of the advancements that were made possible once microorganisms were identified
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the bacteria are unable to convert squalane into squalene for use in the hopanoid biosynthesis pathway. Another possibility is that the bacteria are using other materials than squalane as a preferred substrate in this pathway‚ as they would require less energy to convert into the necessary compounds. Despite the lack of temperature-dependent effects‚ the consistent significant increase in growth in samples treated with squalane indicates that this compound provides some benefit to the bacteria. In
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They are also called bacteria group ● They have cell wall that are made of peptidoglycan ● They have varied shapes ● Basic Shapes of Bacteria ● 1.) Cocci ● They are differently arranged ● They can form pairs (diplococcus)‚ chains (streptococcus)‚ or clusters (staphylococcus) ● They are spherical in shape 2.) Bacilli ● They can also occur in chains (streptobacillus) ● They are spherical in shape 3.) Spirilla ● They are spiral in shape Bioremediation ● “Oil-eating bacteria” ● Scientists at
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Mrs. Hafell 5th Period Biology | 2008-2009 | | Abstract How Food Preservatives affect the growth of Microorganisms? Aya Zbedah Ballard High School The purpose of this project is to see which preservative will either slow down the growth of bacteria or speed up the growth using the three most common preservatives: sugar‚ salt and‚ vinegar. Humans usually have a problem keeping their food safe and clean at the same time to prevent from getting sick. But what they don’t know is that the way they
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cell‚ which would otherwise be unseen. Further‚ in order to use the oil immersion objective of the microscope and thereby obtain the greatest degree of magnification‚ it is convenient to use stained preparations rather than wet mounts.1 Although bacteria do not appear greatly different from their
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“spreading” the bacteria on a nutrient growth media in a specific manner as demonstrated in the lab tonight. In this lab we will be learning two methods to accomplish this task‚ the quadrant streak and the T streak. 1. Quadrant streak 2. T streak [pic] Lab exercise: Following the demonstration of both of these isolation techniques‚ it is your job to see how well you can repeat the procedure‚ and get isolated colonies of bacteria. A colony of bacteria is nothing more
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