The Observation of organism in a drop of pond water (Paramecium) under LPO and HPO Compound Microscope Doreenda A. Sabao BS Biology I-A .Lab 1 August 01‚ 2013 INTODUCTION A pond is a body of freshwater smaller than a lake. Ponds are naturally formed by a depression in the ground filling and retaining water. Streams or spring water is usually fed into these bodies. They can also be man-made ponds which can be created by damming a stream‚ digging a hole. Ponds are usually
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Antibiotics are chemicals produced by living organisms that are used to kill or inhibit the growth of other infectious micro-organisms. Most antibiotics prevent the growth of microorganisms‚ which they act on instead of completely killing them. Antibiotics are extra cellular products meaning that they can be extracted for use; Penicillin is an example of this as it comes from the fungus Penicillium notatum. Hormones are chemicals that transfer information and instructions between cells in animals
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Research on Biopolymers Biopolymers are polymers that those that are made from living things and can be broken down by micro-organisms when released into the environment. Polyhydroxybutyrate (PHB) is a polyhydroxyalkanoate produced by a microorganism called Alcaligenes Eutrophs. The bacterial culture is given abundant nutrient for rapid replication. Nutrient supply is then drastically reduced and the bacteria converts the available food into energy storage. This is produced in the form of PHB. PHB
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Available online at www.sciencedirect.com Polyhydroxyalkanoates: bioplastics with a green agenda Tajalli Keshavarz and Ipsita Roy Production of polyhydroxyalkanoates (PHAs) has been investigated for more than eighty years but recently a number of factors including increase in the price of crude oil and public awareness of the environmental issues have become a notable driving force for extended research on biopolymers. The versatility of PHAs has made them good candidates for the study
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are classified and identified to distinguish one organism from another and to group similar organisms by criteria of interest to microbiologists or other scientists. The most important level of this type of classification is the species level. Microorganisms are found almost everywhere on Earth. You have more bacteria living on you than there are people on earth. Yet they could all be packed into something the size of a soup tin. We are used to thinking of germs as being “bad”‚ but it is all these
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The Immune System is a very complicated thing‚ and you can simplify it by comparing it to a defense in football. In football‚ you have three lines of defense‚ just like the Immune System. There is the defensive line‚ linebackers‚ and the secondary. The defensive line is like the first layer of defense‚ the linebackers the second line of defense‚ and the defensive backs the third line of defense. Each of them have their own responsibilities‚ but work together for the same goal. They work as a team
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The Effects of Antibiotics on Bacterial Growth Biology II 1996 Bacteria are the most common and ancient microorganisms on earth. Most bacteria are microscopic‚ measuring 1 micron in length. However‚ colonies of bacteria grown in a laboratory petri dish can be seen with the unaided eye. There are many divisions and classifications of bacteria that assist in identifying them. The first two types of bacteria are archaebacteria and eubacteria. Both groups have common ancestors dating to more
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plagues‚ for example the dark infection and typhus‚ which attacked Europe in the Middle Ages‚ murdering millions in each city‚ and of smallpox‚ which cleared through the New World. The fight is not over‚ nonetheless‚ and never will be. Pathogenic microorganisms‚ organisms‚ infections‚ protozans‚ and worms press on to torment each social order and undoubtedly each individual. They are certain segments of nature. A significant
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Clostridium difficile There are many microbes that live in the human digestive tract. Most keep us regular and healthy. Some of these organisms keep others in check. When the balance of these good and bad organisms is disrupted‚ we can become sick. Clostridium difficile (C.diff or C.difficile) can grow out of control if this happens. This happens when a person is on antibiotics for another reason and the normal flora of the gut is eradicated. Clostridium difficile is typically found in hospitals
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you must have placed 20 cells to create these 20 colonies. These cells are therefore referred to as colony forming units or CFUs for short. From the number of colonies and the dilution of the growth on a plate we are able to count the number of microorganism in an original culture. The equation for that: Concentration of culture in CFU/ml = number of colonies on a plate multiplied by the serial dilution on that same plate In this exercise you were browsing through a refrigerator in a microbiology
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