lactose fermentation. On an SS plate‚ lactose fermenters will appear pink. In addition‚ SS agar contains thiosulfate‚ which if reduced to hydrogen sulfide by an organism‚ will react with ferric iron in the medium to produce a black center in the bacterial colonies. Kligler’s iron agar (KIA) slant also served as an indicator for hydrogen sulfide production‚ but from the degradation of cysteine‚ not thiosulfate. If synthesized‚ the H2S reacted with ferrous salts in the
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bacterium‚ protest‚ mold or yeast? Bacteria Bacteria Bacteria Bacteria 3. General characteristics. Morphology: Bacilli pleomorphic-( cocci ->filaments) varies Motility: flagella Gram reaction: gram negative Requirement growth: aerobe Opportunistic Pathogen Fastidious Requires special media( charcoal yeast extract) or cell culture Hard to gram stain Morphology: bacilli Motility: flagella Gram reaction: gram negative Requirement growth: aerobe Oxidase positive Catalase
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Abstract The ecology of diatoms may be better explained by conceptualizing them as composite organisms consisting of the host cell and its bacterial associates. Our previous investigated diatom-bacterial interactions at the single-cell level found that bacterial assemblages varied substantially even among closely related individual host cells. The bacterial assemblages associated with single cells could be separated into three distinct groups‚ but these groups occurred irrespective of host cell
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B.Sc. First Year Semester – I Paper I .Fundamentals of Microbiology Credit - 1 1 Scope & relevance of Microbiology i) ii) iii) Definition & concepts Types of microorganism Distribution of microorganisms in nature 2. Development of Microbiology as a Scientific Discipline 1.1 History i) ii) iii) iv) v) vi) Credit – 2 Early observation of microorganisms Spontaneous generation conflict : Contribution of scientists Recognition of the microbial role in diseases. Koch’s postulates Recognition of microbial
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cotton swab was then thrown in the trash. The bacterial loop was then used to make the second and third streaks on the plate. After each streak‚ the loop was sterilized in the Bunsen burner. The lid was then replaced onto the Petri plate‚ and was moved to the incubator for 48 hours at 35 degrees Celsius. The same procedure was used on all of the samples. Following the 48 hour incubation period‚ the Petri plates were observed for colony morphology‚ and the results were recorded. A Gram
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order to observe the varying morphologies within the colonies. Resulting data was analyzed to provide understanding of the use of differing culture media and conditions for bacterial growth. RESULTSFour different agar types were used in this experiment. The first (Nutrient) allowed for growth of both E. coli and S. aureus. The second agar used (MKL) inhibited the growth of S. aureus but allowed the growth of E. coli. The third (ASH) yielded growth of both bacterial species. The fourth (Mannitol)
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This lab experiment serves as a model for community succession using bacterial colonies as the model. A bacterial colony grows from a single bacterium and is composed of millions of cells. Each colony has distinctive colony morphology: size‚ shape‚ color‚ consistency‚ and color. Community succession is a phenomenon observed in the organizational hierarchy of all living organisms. Community succession is not limited to bacterial colonies‚ but spans the entire community of life. As the community
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Screening and identification of rhizobacteria isolated from heavy metal contaminated soils INTRODUCTION As a result of human activities such as mining‚ agriculture and industrial activity‚ heavy metal pollution has become one of the most serious environmental problems today. Elevated levels of heavy metals not only decrease soil microbial activity and crop production‚ but also threaten human health through the food chain. Soil microorganisms can degrade organic contaminants‚ while metals need
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cause disease in humans‚ animals‚ plants‚ or any other organisms. In fact‚ all organisms made up of eukaryotic cells probably evolved from bacteria-like organisms‚ which were some of the earliest forms of life. In this chapter‚ we will learn how bacterial groups are differentiated from each other and how important bacteria are in the world of microbiology. The discussion emphasizes bacteria that are considered to be of practical importance‚ those important in medicine‚ or those that illustrate biologically
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Viruses: A virus is a small infectious agent that replicates only inside the living cells of other organisms. A virus is a small parasite that cannot reproduce by itself. Once it infects a susceptible cell‚ however‚ a virus can direct the cell to produce many more viruses. Viruses can infect all types of life forms‚ such as animals and plants to microorganisms‚ including bacteria and archaea. Genetic materials of viruses: Most viruses have either RNA or DNA as their genetic material. The nucleic
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