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Sulfate-reducing bacteria (SRB) are most notable for the
Sulfate-reducing bacteria (SRB) are most notable for the

... oxygen, the environmental niches most frequently occupied by these bacteria are anaerobic. ...
Acquisition of Thymidylate Synthetase Activity by a Thymine
Acquisition of Thymidylate Synthetase Activity by a Thymine

... the culture lysed. Experiments were also done to determine the effect of phage infection on the DNA metabolism of thymineless mutants of B. subtilis. A culture of B. subtilis I68 thy-I was grown to a concentration of 3 x io 8 ceUs/ml, in 4oo ml. minimal medium supplemented with acid-hydrolysed casei ...
Helicobacter pylori
Helicobacter pylori

... (stink pink) bacterium. Its outer membrane of lipopolysaccharides, rather than peptidoglycan as found in Gram-positive bacteria. H. pylori use flagella for movement. ...
PDF
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... proliferation in macrophages (Ochman et al., 1996; Cirillo et al., 1998; Hensel et al., 1998). Salmonella typhimurium replicates intracellularly within a vacuole that diverts from the normal phagocytic pathway (MeÂresse et al., 1999b). The Salmonella-containing vacuole (SCV) rapidly loses early endo ...
application~~vnd.ms-powerpoint~~dental plaque part 1
application~~vnd.ms-powerpoint~~dental plaque part 1

... plaque would produce large amounts of noxious products, which would essentially overwhelm the host defenses. ...
DIPHTERIE
DIPHTERIE

... The toxin can also cause nerve damage. Typical targets are nerves to the throat, where poor nerve conduction may cause difficulty swallowing. Nerves to the arms and legs also may become inflamed, causing muscle weakness. If C. diphtheria toxin damages the nerves that help control muscles used in bre ...
The Gram Stain Procedure
The Gram Stain Procedure

... rinsed with alcohol, while other genera were easily decolorized with alcohol and could be then visualized by a contrasting counterstain. This staining procedure defines two bacterial groups: those which retain the primary dyes (“Positive by Gram’s Method” or “Gram-Positive”) and those which are easi ...
Entamoeba histolytica
Entamoeba histolytica

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Entamoeba histolytica
Entamoeba histolytica

... Cysts remain viable in faces for few days, in water for longer periods. Cysts are killed by dryness, heat (over 55ºC) and by chlorine. ...
Entamoeba histolytica
Entamoeba histolytica

... Cysts remain viable in faces for few days, in water for longer periods. Cysts are killed by dryness, heat (over 55ºC) and by chlorine. ...
Photosynthetic electron transport and anaerobic
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... Analysis of puf and puc promoters has been carried out in detail and cis-acting regulatory elements have been identified (reviewed by Klug 1993a). However, the situation regarding trans-acting regulators is less clear. Sganga & Bauer (1992) have identified a gene regA which encodes a trans-acting re ...
Micro Buzzwords for Reproductive
Micro Buzzwords for Reproductive

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Environmental and Food Borne Pathogens Caused by Bacteria Lab
Environmental and Food Borne Pathogens Caused by Bacteria Lab

... food borne illnesses in the US with 128,000 being hospitalized and resulting in over 3,000 deaths. The bacteria we will be looking at are some of the bacteria responsible for these statistics. They are Escherichia coli, Enterobacter spp., Listeria innocua, Salmonella spp., and Staphylococcus aureus. ...
Role of Special Histochemical Stains in Staining
Role of Special Histochemical Stains in Staining

... Utility of the Stain: The carbol fuschin stain helps to identify mycobacteria which are bacilli containing thick waxy cell walls (Latin, myco=wax). Several mycobacteria can cause human disease; the two most significant ones are M. tuberculosis and M.leprae causing tuberculosis and leprosy respective ...
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... no phage free in the medium. Each plaque measured will arise from one infected bacterium. As these infected bacteria begin to lyse and release phage into the medium, plaques will result both from infected cells and from free phage. Because of the way this experiment is begun, with unadsorbed phage b ...
Influence of diet on the structure and function of the bacterial hindgut
Influence of diet on the structure and function of the bacterial hindgut

... To separate bacteria from the eukaryotic tissue, 15 homogenized hindguts were quickly spun (1 s) using a microcentrifuge. The supernatant was then carefully removed and used to extract the hindgut microbial community DNA. Microscopic examination of the supernatant revealed that the gut tissue was ef ...
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Mutations of Bacteria From Virus Sensitivity to Virus Resistance
Mutations of Bacteria From Virus Sensitivity to Virus Resistance

... • If about a billion bacteria mixed with a particular toxin, nearly all of the bacteria are killed. • A few will survive and give rise to colonies that are permanently and specifically resistant to that particular toxin ...
Chapter 20 - Cloudfront.net
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virus and bacteria
virus and bacteria

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... Extracellular receptors and matrix material might participate in direct short-range cell–cell communication between microorganisms and presumably in the differentiation of cells within multicellular communities. However, microorganisms also have the ability to emit and to receive various long-range ...
PulseNet: Using Technology to Track Foodborne
PulseNet: Using Technology to Track Foodborne

... PulseNet seeks to limit the damage. The program, coordinated by the US Centers for Disease Control and Prevention (CDC; www.cdc.gov/pulsenet/), was established as a collaborative group of food safety laboratories in 1996. The decision to create the network — with just 10 labs — was spurred by a food ...
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Unique properties of hyperthermophilic archaea

This article discusses the Unique properties of hyperthermophilic archea. Hyperthermophiles are organisms that can live at temperatures ranging between 70 and 125 °C. They have been the subject of intense study since their discovery in 1977 in the Galapagos Rift. It was thought impossible for life to exist at temperatures as great as 100 °C until Pyrolobus fumarii was discovered in 1997. P. fumarii is an unicellular organism from the domain Archaea living in the hydrothermal vents in black smokers along the Mid-Atlantic Ridge. These organisms can live at 106 °C at a pH of 5.5. In order to get energy from their environment these organisms are facultatively aerobic obligate chemolithoautotrophs, meaning these organisms build biomolecules by harvesting carbon dioxide (CO2) from their environment by using hydrogen (H2) as the primary electron donor and nitrate (NO3−) as the primary electron acceptor. These organisms can even survive the autoclave, which is a machine designed to kill organisms through high temperature and pressure. Because hyperthermophiles live in such hot environments, they need to have DNA, membrane and enzyme modifications in order to withstand the intense thermal energy. Such modifications are currently being studied to better understand what allows an organism or protein to survive such harsh conditions. By learning what allows these organisms to survive such harsh conditions, researchers will be better able to synthesize molecules that are harder to denature that can be used in industry.
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