From the time of the Ancient Romans‚ through the Middle Ages‚ and until the late nineteenth century‚ it was generally accepted that life arose spontaneously from non-living matter. Such "spontaneous generation" appeared to occur primarily in decaying matter. For example‚ a seventeenth century idea for the spontaneous generation of mice required placing sweaty underwear and husks of wheat in an open-mouthed jar. Then‚ waiting for about 21 days‚ during which time it was said that the sweat from the
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Microbial spoilage There are three types of microorganisms that cause food spoilage -- yeasts‚ moulds and bacteria. Bacteria are round‚ rod or spiral shaped microorganisms. Bacteria may grow under a wide variety of conditions. There are many types of bacteria that cause spoilage. They can be divided into: spore-forming and non-spore-forming. Bacteria generally prefer low acid foods like vegetables and meat. In order to destroy bacteria spores in a relatively short period of time‚ low acid foods must
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ANTIMICROBIAL ACTIVITY OF CHILI (CAPSICUM ANNUM) EXTRACT An Investigatory Research Presented to Mrs. Presented by CHAPTER I INTRODUCTION Background of the Study . Capsicum annuum is a domesticated species of the plant genus Capsicum native to southern North America and northern South America. Chili has been a part of the human diet in the Americas since
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* 3. Must have living cells to make more cells * Anton Von Leeuwenhoek * Father microbiology & microscopy * Discovered microorganisms (animalcules) * Disproved microorganisms were heaven sent * Put clean bowl out during rainstorm & no microorganism * Let sit * Days later microorganisms formed from air * Ferdinand Cohn * Discovered endospores (enable some bacteria to survive adverse environmental conditions) * Why
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diverse group: Bacteria - Which one of the following sequences exhibits increasing size? Viruses to bacteria to protozoa - Which one of the following would be consistent with the idea of spontaneous generation? Sick people give rise to microorganisms in their body Chapter 3 - The gram stain technique is valuable in distinguishing: different types of bacteria One of the below is wrong - permit eukaryotic motility: Flagella - are involved in group translocation: Chromosomes - Contain
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What Is Microbiology? Microbiology is the study (logy) of very small (micro) living (bio) things. Microbiology is the study of microorganisms. These "bugs" include: bacteria (that’s the Latin plural for bacterium); viruses (that’s the non-Latin plural for virus - virii sounds weird‚ so I don’t say it); and‚ fungi (that’s the Latin plural for fungus - which by now you have guessed‚ or already knew‚ and may not be all that interested to know‚ anyway). Microbiology is actually made up of several
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experiment‚ Escherichia coli is used as a sample to study the growth kinetic of microorganism in shake flask. A different volume of E.coli was transferred into 250ml Erlenmeyer/shake flask containing media for the nutrient of microorganism. The different volume of microorganism transferred will give the different effect of reading on the constant volume of media used. There are three ways to test the growth kinetic rate of microorganism on shake flask‚ which are by optical density (OD)‚ glucose analysis and
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` Study Guide for Exam 1 Chapter 1: 1. What is a “microbe”? What groups of organisms are included in this category? Microbes (microorganisms) are minute living things that individually are too small to be seen with the unaided eye the group includes bacteria‚ fungi‚ protozoa‚ and microscopic algae‚ viruses Only minority of microorganisms are pathogenic(disease-producing) 2. What are some of the benefits provided by microbes? Decompose organic waste‚ producers in the ecosystem
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How would you convince a friend that microorganisms are more than just disease causing agents? An entire kingdom of microorganisms was brought into life 3 billion years ago. Since then «the earth is a fundamentally a microbial planet‚ to which the micro-organisms are recent the relatively unimportant additions» (Wheelis‚ Mark‚ Principles of modern microbiology‚ 2008‚ p.1). The term microorganisms consist of bacteria‚ archaea‚ fungi‚ and protest‚ which can either be unicellular or multicellular
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media 3. Z-streak - is a technique used to isolate a pure strain from a single species of microorganism‚ often bacteria 4. Selective media – a growth medium or culture medium is a liquid or gel designed to support the growth of microorganisms or cells‚ or small plant 5. Differential media -are used to isolate or identify particular organisms. 6. Microaerophiles - A microaerophile is a microorganism that requires oxygen to survive‚ 7. Aerobic - relating to‚ involving‚ or requiring free
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