Protists available for observation: Euglena Paramecium Difflugia Blepharisma Didinium Amoeba Stentor Spirostomum Vorticella Volvox Bursaria Results All protists that were selected had features in common, but they all moved differently. There was only one colony that was apparent. Explain how your results relate to expectations and to references cited. That is plagiarism and you will receive no credit for this part of the report. Alternatively, materials can be included as part of the procedure. Changes include any change to the procedure written in the lab manual, this includes glassware and concentrations, as well as chemicals.
Experimental Materials and Methods This section should describe all experimental procedures in enough detail so that someone else could repeat the experiment. It's a good idea to consult other lab reports, submitted by a different group that received a good grade or is well-respected. Gram-positive cocci shaped bacteria were identified using the microscope. The first unknown in 123 found to be a gram negative bacteria, was identified as Pseudomonas aeruginosa. The controlled variables are the ones that don't change throughout the experiment. A standard lab write up includes the following sections: I.
Gram positive did not grow. The objective cannot be a verbatim, unreferenced restatement of the objective or purpose that appears in the lab manual. The identity of any unknowns or the final desired results are to be stated in this section. Sometimes, disease-associated strains produce toxins which promote serious infections in the body. It is either a single sentence summary of why the experiment or product was performed or else a single paragraph. Ultimately, the unknown sample was found through these 4 tests.
If leaf color change is related to temperature , then exposing plants to low temperatures will result in changes in leaf color. You want to make sure to provide enough detail so that anyone can complete the experiment and explain the steps in an easy to follow, detailed manner. One way to prevent making such easy mistakes is to formalize the form of the hypothesis. For example, it is 2. Unlike the Amoeba and the Paramecium, the Euglena has plant-like characteristics. The data section must be organized and consistent with any format suggested in the laboratory manual. Example: Water was sampled from each pond and examined under the microscope.
The example protists were: Euglena, Paramecium, and Amoeba. The circumference measurement was obtained by tightly wrapping a small piece of paper around the object, marking the circumference on the paper with a pencil, and measuring this distance with the ruler or caliper. The tooth sharpness of each animal depended on the type of diet each animal had Figure 2. Another way to visualize and calculate this constant circle ratio is by graphing the circumference versus diameter for each object. On the bottom jaw, the deer had three incisors, one canine, three premolars, and three molars. After a Gelatin and a Galactose test were performed, the only bacterium that remained was Pseudomonas aeruginosa.
All protists had animal-like characteristics in terms of their movements and feeding patterns. The precision of the ratio can be estimated using the error propogation formula: Results for all five objects are given in the table below. Include background information that suggest why the topic is of interest and related findings. Taking the calculated number of tooth width and dividing it by the matching jaw length found relative tooth width Figure 3. Simple calculations such as addition and subtraction may be added to data tables, however, the calculation must still be shown in the Analysis section.
A lab write up is a clear, detailed outline of your experiment. You don't want to keep repeating a mistake if you can avoid it from the start! The three protists examined in this lab are examples of protists that use specialized structures for locomotion. By observing, drawing, and classifying protista, we learned about the cell structure and movement patterns of these one-celled organisms. The circumference and diameter of each object was measured with the same measuring device in case the two instruments were not calibrated the same. However, be careful not to over explain or add in irrelevant information. Using a light microscope, each protist was examined at different magnifications until the best field of view was found for identifying cellular structures.
The independent variable is the one thing you will change during the experiment. The result of the tests for Gram positive led to the identification of Staphylococcus aureus. Hypothesis: If the plant is given water then the plant will grow the tallest because water helps the plant absorb the nutrients that the plant needs to survive. This test gave a positive result turning a brown color, meaning the gram negative bacteria produced the enzyme casease in order to break down the milk protein casein. This will be a vital task to take with me into my profession for many reasons. You should put the objective in your own words, not merely rearrange the words used in the lab manual.