Growing bacteria lab report

Tip the slide and add several drops of the ethyl alcohol to the upper end.

Bacteria experiments college

References Bacteria Parasites Remedies. If known samples are not available, you can gram stain a sample from your petri dish, but there will be no way to check your accuracy. This type of media is used for the detection of microorganisms and by molecular biologists to detect recombinant strains of bacteria. Bunsen burner 6. This introduces a solution of the bacteria or fungi to a substrate which provides them nutrients. To learn how to make sterile microbiological agar plate media and pour agar plates. Both methods separate the individual cells so that, when they multiply, each will form a discrete colony which may then be used to inoculate more medium, with the assurance that only one type of organism will be present. The second quarter was streaked without passing the loop in the previous streaks. Add about drops of iodine to the smear. The loop is spread around another fourth of the plate much like the previous step. Although great care was taken to avoid contamination of the sterile agar plates, both students dried their hands with non-sterile hand towels prior to inoculating the second agar plate.

Introduction The modern streak plate procedure has evolved from attempts by Robert Koch and other early microbiologists to obtain pure bacterial cultures in order to study them, as detailed in an paper authored by Koch.

The volume was adjusted to about 80 ml and pH to 7 using NaOH. References Bacteria Parasites Remedies.

Bacteria experiment ideas

This introduces a solution of the bacteria or fungi to a substrate which provides them nutrients. We hypothesized that the plate inoculated with a clean fingertip would present with fewer bacterial colonies than those inoculated with an unwashed fingertip. Lactococcus lactis Include sketches, photos, or descriptions of samples you viewed in the lab. The loop is spread around another fourth of the plate much like the previous step. Boston: Benjamin Cummings. This is done by streaking, enhance by the sterilized inoculation loop. Many people are unaware of the impact that bacteria has on our everyday lives. Eubacteria are placed in a division depending on the type of cell wall they have. First, we gently rubbed one fingertip in a sterilized agar plate using caution to avoid contamination from the air while the lid was open. Although the difference between the unwashed and washed cultures was not remarkable, there was a slight reduction in the number of bacterial colonies present on the plates that were inoculated with our clean hands. Agar, because of its characteristics of melting only when boiled, rarely being digested by bacteria, and providing a substance in which other nutrients could be dissolved, proved to be a suitable material on which to grow bacteria. The streak plate is then incubated, usually for 24 to 36 hours, to allow the bacteria to reproduce. Example : If volumes of ml are made, 1g of agar will be used 6. Microbial Growth Control.

Don't forget to write down the names of your samples to include in your lab report later. Nutrition, Culture, and Metabolism of Microorganisms. Define the following terms: a Selective media Selective media allow certain types of organisms to grow, and inhibit the growth of other organisms.

growing bacteria lab worksheet

There were 3 distinct bacterial colonies in the agar plates created after hand washing compared to 4 bacterial colonies on the agar plates inoculated with unwashed hands. Like other growth medium, the formulations of agar used in plates may be classified as either defined or undefined; defined medium being synthesized from the individual chemicals as required by the organism so that the exact molecular composition is known, while undefined medium is made up of natural products such as yeast extract, where the precise composition is unknown.

The lid of the sterile LB plate prepared was raised and the loop was streaked across approximately one-quarter of the plate.

Both agar plates were sealed with Parafilm to prevent contamination.

Culturing bacteria on agar plates

Although great care was taken to avoid contamination of the sterile agar plates, both students dried their hands with non-sterile hand towels prior to inoculating the second agar plate. There were 3 distinct bacterial colonies in the agar plates created after hand washing compared to 4 bacterial colonies on the agar plates inoculated with unwashed hands. Both agar plates were sealed with Parafilm to prevent contamination. Probiotic bacteria provide positive health effects to the host. An autoclave is a pressurized device designed to heat aqueous solutions above their boiling point to achieve sterilization. References Bacteria Parasites Remedies. As the container is heated the pressure rises due to the constant volume of the container. It was allowed to cool in 10 seconds. The volume was adjusted to about 80 ml and pH to 7 using NaOH. Distilled water was added to the final volume ml in a graduated cylinder. Marking pen Methods A. The second quarter was streaked without passing the loop in the previous streaks.

Step 5 was repeated with a third and fourth quarter of the plate and the lid was replaced. Probiotic bacteria provide positive health effects to the host. The loop is sterilized and the procedure is repeated.

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Bacteria Growing Experiments in Petri Plates