A. The typical human mouth contains a writhing orgy of bacteria. Most of these. Most of these microscopic organisms are bengin‚ and some are even beneficial‚ but one particular variety is a conspicuous troublemaker: Streptococcus mutans. These ubiquitous bacteria thrive on sugars in the mouth‚ which they consume while excreting lactic acid. This acid is responsible for the great majority of tooth decay in humankind because it erodes the enamel and dentin of the teeth. B. A Florida-based company
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Cryptosporidium Parvum Case Summary Johnny Doe‚ a 26-year old patient‚ is admitted to the local hospital’s emergency department with the complaints of severe nausea‚ abdominal cramps‚ and watery diarrhea. Johnny was previously diagnosed with HIV‚ about five years ago. The diarrhea began about two weeks ago and he has had eight to twelve watery stools per day‚ and also refers to a loss of appetite and low fevers. He is an active swimmer and goes swimming frequently in the local town lake as well as
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CHAPTER I INTRODUCTION 1. ENTEROCOCCUS FAECALIS AND STAPHYLOCOCCUS AUREUS OUTLINE The Human indigenous micro flora consists of opportunistic pathogens along with other nonpathogenic bacterial strains. Two eloquent members of the category of gram- positive bacteria‚ Enterococcus faecalis and Staphylococcus aureus belong to this category. Being a facultative anaerobe‚ aero tolerant anaerobe respectively‚ both of these organisms inhabited the human body for centuries. Ability to thrive in extreme condition
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I had # 8 organism‚ Bacillus subtilis. Bacillus subtilis is a Gram-positive bacteria‚ rod-shaped and catalase positive. In order to figure out what is my unknown organism for this assignment‚ I had to perform series of tests. First was the glucose‚ lactose‚ and sucrose test. Through these three tests‚ I was able to detect the ability of the microorganism to ferment a specific carbohydrate. Fermentation reactions are observed by the color change in pH. In class‚ we used phenol red as the pH indicator
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Bacteria have to developed a variety of mechanisms that allow them to enter the cells of their host‚ whether to replicate or to transmit the pathogen. One method of this is through pili. Pili are thin rods anchored to the outer membrane of bacteria with an adhesin at the tip. This adhesin is what gives the bacteria their binding specificity. Pili can serve a variety of roles such as‚ adhesion or the transfer of material during bacterial conjugation. Fimbria are a type of pili that are solely for
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Bonnie Bassler claims that bacteria although simple have complex systems that they use to communicate with each other to coordinate. This is crucial to humans because Dr. Bassler considers humans to be 90-99% bacterial. Dr. Bassler states we have about one trillion human cells but we have about 10 trillion bacterial cells that either live in or on humans. The number of bacterial genes in those cells outnumber humans by 100 times since humans only have 30‚000 genes. These bacteria share a mutualistic
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Aseptic Technique & Culturing Microbes Questions A. What is the difference between a bactericidal and bacteriostatic agent? What is the difference between sterilization and disinfection? Control of growth refers to the prevention of growth of microorganisms. This control is affected in two basic ways: by killing microorganisms or by inhibiting the growth of microorganisms
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Gram Positive Unknown: “Enterococcus faecalis” Family: enterococcaceae Genus: enterococcus Species: faecalis Gram + Oxygen class: facultative anaerobe Temperature class: mesophile – they can grow in the range of 10 °C - 45 °C pH class: can grow at a pH range of (4.6 – 9.9) with the optimum at 7.5 Enterococci can survive very harsh environments including extreme alkaline pH 9.6 and salt concentrations (basic). Environment: They can
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Pathogen Project #7 Salmonella 1) What type of microbe: G - bacterium 2) What is the natural habitat of your pathogen‚ that is‚ where does it reproduce or what is the reservoir? Animals are the main reservoir for Salmonella. It also lives on eggs‚ raw meats‚ unpasteurized milk‚ fruits‚ and vegetables. 3) What disease it causes – that is‚ the MAIN disease it causes: The primary disease Salmonella causes is gastroenteritis. Gastroenteritis causes bloating‚ abdominal cramping and most commonly
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In medical facilities it is necessary to equips materials and surfaces with a high level of hygiene using antimicrobial agents to protect them against bacteria and other micro organisms to prevent infections caused by bacteria and contribute significantly to reduce health costs. Benefits of nanoscale coatings in this sector include long lasting antimicrobial effect‚ constant release of the active substance‚ effectiveness against bacteria and other micro-organisms‚ no chemical impurities‚ easy processing
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