This happened because the plate was given no bacteria or anything to start growth. 4. The only plate where the E. coli should glow is on the LB/A/X+ plate. The reason for this is that it was the only plate that was given pBlu and no anti-biotic. This causes it to reproduce blue colonies of bacteria.
Abstract In this experiment we are explored the simple calorimetric estimate for the enthalpy of combustion of different alcohols. Our aim is to find out which alcohol is most efficient. Method First of all we drew up a table – this was what we used to record our results in. We then measured 100cm3 of water into a measuring cylinder and poured the water into steel we then recorded its temperature. We selected a spirit burner and recorded the name of the fuel into our table; we also included the mass of the whole burner.
By showering, swimmers remove the cream and sun lotions that cling to pool tiles, which in turn attract dirt. It also reduces the risk of hair, mucus and faeces entering the water. The risks can be reduced even more if a pool is properly disinfected. Chlorine based chemicals and proper filtration can kill most bacteria. The people at risk are the students and staff because in Ivy House the staff take the children into the pool so they can watch over them and help them float on top of the water so they do not drown or injure themselves.
6/28/2012 The 1st lab procedure performed was the gram stain. Previously, before starting the gram stain I prepared a bacterial smear on a glass slide and used the heat fixing method which was done to help the bacteria cells adhere to the glass, kill them, and also helps make the cells easier to stain by coagulating the cells proteins. The gram stain test helped me identify rather my bacterium would be a negative or positive and determined the microscopic morphology (shape, and arrangement) of my bacterium as well. The test
Therefore the alkalinity of water samples is being calculated. In the second approach, the two volume readings for the respective amounts of sulfuric acid used are being determined an indicator based method. Congo red and bromocresol green are being used as the indicators. Procedure (Outline provided as pre-lab): A. The pH meter was calibrated using standard pH solutions provided.
DATE: 10/2/2012 LAB 3 – PHYSICAL & CHEMICAL PROPERTIES *Adapted from LabPaq Purpose: To determine whether certain changes in matter are chemical or physical, and to describe the changes in detail using observational skills Observations and Experimental Data: Substance: Mg Color: Silver Odor: Slighty Effect of Heat: Particles moved, bubbles flowing up to top Solub. or Reaction w/cold H2O: No reaction Solub. or Reaction w/hot H2O: Bubbles produced from the gas Litmus test: Red turned blue and blue had no change Dilute HCl: Sizzle, steams, heat output Dilute NaOH: Gas was formed. Substance: Cu Color: Redish Brown Odor: None Effect of Heat: Became darker, almost purple like. Solub.
Hydrate Lab The purpose of this lab is to analyze the percent water in a crystalline hydrate and to indentify the hydrate from a list of possible unknowns. The solid hydrate will be heated to remove the water, and the percent can be found by measuring the mass of the solid before and after heating. The hydrate will be indentified by comparing the percent water in the hydrate with the percent water calculated for the possible unknown. Before the lab there are pre-lab questions: 1. Describe the three general safety rules for working with a Bunsen burner.
e Disease Name Legionnaires Disease Causative Agent The causative agent for the Legionnaires Disease is the bacteria called Legionella. These bacteria are naturally found in the environment, most especially in water. The bacteria grow best in warm water. Sometimes it can be found in cooling towers, hot tubs, hot water tanks, large plumbing systems, or even parts of some air – conditioning systems of large buildings. However, these bacteria do not grow in the air – conditioners in cars or windows (Centers for Disease Control, 2011).
If the urea is broken down by H. pylori in the biopsy, there is a change in color around the biopsy on the slide. This means that there is an infection with H. pylori in the stomach. Biopsies also may be cultured in the bacteriology laboratory for the presence of H. pylori; however, this is done infrequently since other simpler tests are available. A recently-developed test for H. pylori is a test in which the presence of the bacterium can be diagnosed with a sample of stool. The test uses an antibody to H. pylori to determine if H. pylori is present in the stool.
A process called mass bleaching has also become a danger to coral reefs. Mass bleaching happens when water temperatures rise to unusual levels, which then causes the coral to release colorful microscopic algae that usually provide the coral polyps with food. This process affects plankton and other small organisms, which in turn affects the fish that typically feed on such organisms. The affect of climate change on coral reefs is only one prime example of how climate change can affect marine life. Phytoplankton populations have also been affected by the warming temperatures in the ocean.