my experiment to test the effects of topical chemicals on bacteria living on my hands. In doing this experiment I used hand soap and hand sanitizer on the living bacteria. I followed the procedure for setting up the bacteria culture as listed in the lab manual. I swabbed the bacteria sample from my palm‚ fingers and finger tips. In addition to the two experimental variables‚ I had two separate control quadrants‚ one containing water and the other containing bleach. After completing the bacteria culture
Premium Bacteria Microbiology Antibiotic resistance
glucose to acetylmethylcarbinol. The test will react with alpha-naphthol and potassium hydroxide if glucose is being broken down and turn a red color. If a test is positive it will show a maroon colored band on the top portion of the broth. Lab Results E. coli is MR+ because it does ferment glucose and the has a high acidity produced during the fermentation. E Coli is VP- because it does not make acetyl methyl carbinol‚ a neutral product. E. Coli produces more acidic products S. epidermidis
Free Bacteria Metabolism Protein
are endocytosis‚ exocytosis‚ and phagocytosis. Passive transport does not require energy it is powered by the concentration gradient of the molecule. Examples of passive transport are diffusion‚ facilitated diffusion‚ filtration‚ and osmosis. In our Osmosis Lab I used a Grade a large egg from the grocery store. Its circumference is 5 ½ inches it is smooth with no cracks. I carefully place the egg in a clear plastic cup and fill the cup with vinegar. I immediately notice bubbles covering the egg
Premium Cell membrane Red blood cell
of this molecular movement. Diffusion is the random movement of molecules from an area of higher concentration to areas of lower concentration. Osmosis is a special kind of diffusion where water moves through a selectively permeable membrane that only allows certain molecules to diffuse though (Lab Manual 7e‚ 2010). Diffusion or osmosis occurs until dynamic equilibrium has been reached. This is the point where the concentrations in both areas are equal and no net movement will occur
Premium Osmosis Concentration Diffusion
biology sbi4uo-a | Osmosis and Diffusion Lab | By: Elora Hobbin | | Group Members : Ashley Riley-Roy and Adam Reynolds | 9/11/2012 | | Introduction: Osmosis and diffusion are two procedures that are critical for cell survival. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. Osmosis is the movement of water molecules across a cell’s membrane. These two procedures help a cell to survive because they help maintain homestasis
Premium Water Diffusion Molecular diffusion
BIO 162 Microbiology for Allied Health D. Page Baluch Microbiology Many technical terms‚ names of cell structures are formed from Latin or Greek roots micro - very small; bio – life; ology – study study of very small living organisms that cannot be seen with unaided eyes Microorganisms or microbes They are virtually everywhere - ubiquitous Types of Microorganisms Bacteria Fungus Yeast & molds Bacillus E. coli Algae Archaebacteria Diatom Dead Sea salt pillar
Premium Microbiology Bacteria
Egg Osmosis Lab Introduction What is osmosis? Osmosis is a very important part of biology. It is the spontaneous passage of water or other solvents through a semipermeable membrane. A semipermeable membrane is one that blocks the passage of dissolved substances. Osmosis occurs when there is an imbalance of solutes outside of a cell versus inside the cell. A solution that has a higher concentration of solutes than another solution is said to be hypertonic‚ and water molecules tend to diffuse into
Premium Osmosis Tea
My Investigation on osmosis Osmosis is a special kind of diffusion. While diffusion can describe the movement of any kind of molecule‚ osmosis is only about the movement of water molecules. To show this diffusion I will be using potato discs‚ of the same size and mass‚ in different concentrations of sugar solution to find out whether the mass of the discs increases or decreases depending on the concentration. I predict that when the sugar solution is 0% the mass will increase as there is
Premium Concentration Chemistry Solution
Osmosis using potato cores and sucrose solution 1.0 Abstract This experiment’s ultimate goal is to find the water potential of the potato cell. This was achieved through placing potato cores in different concentrations of sucrose (0.2%‚ 0.4%‚ 0.6%‚ 0.8%‚ 1.0%‚ 2.0%‚ 3.0% and 4.0%) solution and to observe how much water was gained or lost through osmosis to reach a prediction of the concentration within the potato cell. The results displayed that the concentration of sucrose within the potato cell
Premium Osmosis
Demonstrating osmosis Introduction The movement of water in and out of a system bounded by a membrane permeable to water‚ but not certain other substances‚ can be inferred by either mass changes or volume changes in that system. It is possible to monitor other changes in physical conditions‚ such as texture. Monitoring mass enables quantification of the changes‚ whereas other changes may only be qualitatively measured. Equipment / materials 4 eggs Sugar Distilled water Acetic acid Scales
Premium Water Acetic acid Oxygen