satisfactory method employed to evaluate the effectiveness of antiseptic agents against selected test organism. In this method‚ sterile filter paper disk is impregnated with an antiseotic and placed on fresh heavily inoculated agar plate of a test organism. Following incubation‚ the agar plate is looked for a zone of inhibition. The presence of a clear zone of inhibition surrounding the disk is indicative of inhibitory (antimicrobial) activity against the organism. This experiment deal with the evaluation
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penguins. Not many foresaw the radiating shine of the Moon jellies swimming in their glimmering tank. Their unique resplendent glowing bodies propelled smoothly through the water. At sudden first glance these aquatic invertebrates seem like something from outer space. Though in reality they are a very common species of jellies that live in the temperate and tropical shallow waters of the ocean or at home in an acrylic tank. Like all animals Moon Jellies have their own special features such as their body
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Question: How does the size of the cell affect its efficiency in exchanging substances through several ways‚ like diffusion? Aim: To plan and carry out an investigation to show the relationship between volume/Cm3‚ surface area‚ and diffusion using agar cubes measured in time/s; and to demonstrate‚ using diffusion‚ why the size of cells is limited‚ keeping the room temperature and pressure constant. Hypothesis: I expect to find that when the surface area to volume of a cell reaches a certain level
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alcohol solution‚ 1 Zip bag‚ 1 Pan to heat agar‚ 1 Isopropyl alcohol (rubbing alcohol)‚ 1 Cultures: S. epidermidis and L. acidophilus‚ 1 Gloves‚ Disposable‚ 1 Pencil‚ marking‚ 11 Petri dish‚ 60 mm‚ 2 Candles (flame source)‚ 1 Thermometer-in-cardboard-tube‚6 Test Tube(6)‚ 16 x 125 mm in Bubble Bag‚ 1 Test tube holder‚ 1 Test-tube-rack-6x21-mm‚ 1 Pipet Graduated Small (5 mL)‚ 1 Baker’s Yeast Packet – Saccharomyces cerevisiae‚ 1 Agar‚ MRS - 18 mL in Glass Tube‚ 4 Agar‚ Nutrient - 18 mL in Glass Tube‚ 1 Broth
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of different concentration of protease. In this experiment‚ a plate of milk agar is needed for comparing the result of each sample. Circular wells were dug on the milk agar plates by the use of cork borer‚ and extracts could be put into the wells by dropper. One must note that milk-agar is white in color due to casein. If protease is present‚ casein will be digested by the enzyme giving a clear zone in the milk-agar plate. The size of the clear zone can help us to determine whether fruits differ
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in partial fulfilment of requirements in Biology 101.1 under Prof. Kimverly Hazel Coronel‚ 1st sem‚ 2013-2014 ABSTRACT The effect of molecular weight on the rate of diffusion was assessed using the agar-water gel test. The agar-water gel set up was composed of a six petri dish of agar-water gel containing two wells. Pinch of potassium permanganate (KMnO4) and methylene blue (C16H18N3SCl) were simultaneously introduced to each dish and measured the distance and its rate. Methylene blue‚ having
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differed between my group’s nutrient agar and MAC agar plates. In courgette‚ there was moderate growth in nutrient agar while it was heavy in Mac agar. In beef broth‚ there was slight growth in nutrient agar while it was negative in MAC agar. In fresh basil‚ growth was heavy in nutrient agar while it was heavy in MAC agar. Where cottage cheese was the ingredient‚ both plates had heavy growth. For walnut‚ growth was slight in nutrient agar while it was negative in MAC agar. Generally‚ the slight difference
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environment keep on changing meaning they went form grabbing the mixed food from the table to grabbing Jelly-beans from table to grabbing jelly-beans from the carpet to grabbing popcorn for the carpet making it hard for some utensil (bird beak) to grab the food and surviving which eventually caused them to die. Not only did the environment change but the food source also chance. It went form mixed food to jelly beans and popcorn but as the food change and the amount of food got limited causing the non-fitness
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Diffusion in agar cubes Introduction: All cells are dependent on a processes called diffusion‚ which is the movement of a substance from an area of higher concentration to an area of lower concentration. Cells need to obtain certain essential substances‚ like oxygen‚ for their survival. The rate of diffusion is said to be dependent upon the various factors: Size of molecules that have to diffuse‚ concentration gradient‚ the distance across which diffusion occurs‚ number of pores/openings‚ surface
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appropriate media using aseptic transfer techniques. The necessity and value of collecting‚ identifying and analyzing is critical for learning how diseases are acquired‚ spread and therefore prevented. Materials Sterile nutrient agar petri dish Wax Pencil Lens paper Sterile blood agar petri dish Igniter Immersion oil Sterile cotton swabs Crystal violet dye Pen Incubator Grams iodine Paper Refrigerator Alcohol acetone Distilled water Safranin dye Inoculating loop Sink Bunsen
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