Petri dish

Catalase containing, positive, bacteria consist of aerobic, oxygen respiring, and facultative anaerobic, can grow either with or without oxygen, bacteria. Being catalase positive means the bacteria is exposed to hydrogen peroxide in a concentration high enough to make it toxic to the bacteria cells. Thus, the cell needs to break down the hydrogen peroxide into water and oxygen gas to survive. Catalase positive bacteria can include beneficial bacteria. Two harmful bacteria that are catalase…

seeds into six groups of ten. We then labeled each dish by trial and whether it is with or without oil: T1-W, T1-W/O, T2-W, T2-W/O, T3-W, T3-W/O. Following labeling, we placed one paper towel into each of the six three and a half inch plastic petri dishes. Next, we watered each petri dish with two to three milliliters of water. Then, we placed one of the six groups of seeds into each petri dish, on top of the paper towel. All seeds in each petri dish labeled ‘With’ will be sprayed with cooking…

during this process. Procedure Prepare Agar Plates by heating a mixture of 1 Liter purified water and 23 grams Nutrient Agar powder for 15 minutes on a hot plate at 121ºC while stirring consistently. Once the mixture is clear, pour it into the petri dishes one at a time by just barely covering the surface of the plate. Set the plates to the side to settle Tape the meter stick to a counter to measure the drop height of 1.0 meters- leave the meter stick there as a guide from which to drop the…

In one petri dish I used 15ml of pure distilled water (the typical environment of daphnia) as my control to look back on and compare to my experimental group my altered variables. In my three other dishes I started with 15 ml of pure water, 2-3 daphnia, and introduced 2 ml of harmful substance ( Prestone :antifreeze,Bayer Advanced: pesticide, and Malaboro :cigarette ash). After exposing the daphnia to these chemicals, I observed each petri dish and studied the change in behavior…

able to glow, because the sugar (arabinose) needed for the switch to turn on would be present in the agar, letting the gene be able to present itself in the war. In future experiments, the incubation and the amount of E. coli along with the amount of petri dishes could be doubled or even tripled to gain more data that can be better averaged to make a new conclusion to the…

TOLERANCE OF LIVING ORGANISMS TO LIMITING FACTORS Marjorie Villareal INTRODUCTION It is a recognized principle of Ecology that the interactions of organisms and environment are reciprocal. The environment not only determines the conditions under which life exists, but the organisms influence the conditions prevailing in their environment as well (Brett, 1969). When organisms encounter harsh abiotic conditions, they may have one of two responses. Evolutionary adaptations in their morphology,…

One of the kinds of lotions is Jergens Original Scent. It moisturizes because of its nourishing emollients. The chemicals in this lotion are the nourishing emollients. The benefit of these chemicals is to moisturize skin. The second kind of lotion, Aveeno, has a unique oatmeal formula. The different chemicals are dimethicone 1.2% and colloidal oatmeal. The dimethicone 1.2% is the skin protectant. The colloidal oatmeal, protects dry skin, smoothes skin, and makes the skin look healthy.…

five-second rule,” by dropping the food on the floor and using a stopwatch. They would test one time above five seconds. The second time they would test less than five seconds. They would swab the food onto a petri dish and wait for bacteria to grow. After a few days, the results showed both petri dishes grew bacteria whether the food was less than five seconds or more than five seconds.…

were on the top of the lid before retrieved. Under the dissecting microscope, the details of the shell were asymmetrical and smooth. The foot of the snails secreted mucus as they move around the Petri dish. Based on the observation, we hypothesized that these garden snails will move upward if the Petri dish was vertical since it is easier for them to climb upward due to their slime in which lubricate their movement. Also, higher ground will provide them an advantage to seek resources such as…

Hypothesis: Out of the five tested antibiotics, doxycycline will kill the most Rhodococcus rhodochrous because it is generally used to treat mild infections. This will be tested by spreading the bacteria on agar in a Petri dish and adding a small amount of each antibiotic to the Petri dish. Research: Professor Stephen Bell at Indiana University studies the structure, behavior, and evolution of archaebacteria. Recently, he did research on the Sulfolobus genome and how they reproduce. Most…