Chemotaxis

Goals E. coli is a type of bacteria that sense and swim towards sugar, amino acids, pyrimidines and electron acceptors. Thus, the goal of this experiment was to determine whether E. coli has a direct motion or random motion when a chemoattractant (glucose) was present. This was done by observing the velocity before and after the chemoattractant and by making Log-Log Plot. Theoretical Chemotaxis refers to the ability of organisms to move in response to the presence of a chemical. The movement of organisms could be either attractant in the same direction as chemoattractants , or it can repel the chemoattractant. Direct motion is defined when an organism move with regard to a reference point in a followed pathway. However, bacteria might also move randomly as a result of their collision with other fast moving particles in various environments. When there is a gradient present, E. coli moves to the chemical emitted from the chemoattractant. The attracted chemical binds to the chemoreceptors known as methyl-accepting chemotaxis proteins in the cell membrane of E. coli. E. coli…

Project Name: The effect of sugar and salt solution on the chemotaxis of planarians Introduction Questions: The research question is, “What is the effect of sugar and salt solution on the chemotaxis of planaria?” This research question is worth asking to see if planarians have an affinity toward salt or sugar solutions. By studying different types of organisms, we are better able to see the type of environment that organisms like to live in. This allows us to have a better understanding…

Chemotaxis is the directional migration of cells in response to a chemical stimulus. The movement of these cells can either be directed towards favourable chemicals (chemoattractants) or unfavourable chemicals (chemorepellents). In particular, sugars and amino acids can attract many species of bacteria via chemotaxis, and the main method used to identify these chemicals is an assay that uses a glass capillary (Abe et al., 2017). In the capillary assay, the outer chamber contains mobile cells…

The effects of gene mutation on Olfactory Sensory Neurons in Caenorhabditis Elegans Amira Brown University of California, Santa Barbara Abstract This experiment examines the effects of distinct odorants on chemotaxis behavior of the nematode worm, Caenorhabditis elegans (C. Elegans). Nematode worms are appropriate for sensory physiology studies because its neuronal wiring is similar to that of humans. We focused on the role of three sensory neurons in the nose of the…

Only our individual syd-1 data was able to exactly match with the theoretical chemotaxis index. There are many potential reasons why the worms did not move towards the diacetyl, however, it was surprising how syd-1expressed such a strong experimental chemotaxis of 1.00 compared to even our negative control which had a value of 0.583. Our second experimental variable dpy-2 had an experimental chemotaxis of 0.737. These two chemotaxis values had a higher chemotaxis value than our negative…

20 bugs into the center chamber and watched them wander around until they started to settle in one area. After the 10 minutes was up, the most pillbugs were in the solution made with a concentration of 15 g of sucrose and 35 mL of water. We discerned that the bugs showed a reaction to chemotaxis since there was no water, but they were attracted to the solutions that were made with more water. The two most popular chambers were those of 15 g of sucrose and 35 mL of water, and 20 g of sucrose with…

neurological behavior. The purpose of this experiment is to determine whether the chemical, 2-nonanone, exhibits attraction or repulsion towards the olfaction of C. elegans. With our previous experiment, we observed the attractive properties of diacetyl, but now we want to observe the chemotaxis index (CI) of 2-nonanone. The previous experiment allowed us to determine the average CI of a test solution with diacetyl to be 0.525, while the control solution with ethanol was observed to be 0.009.…

the extreme conditions, conditions that other marine life and wildlife in general are not able to handle, and also live in conditions with high amounts of algae as their food source. My predictions for the experiments on which certain niches Brine Shrimp like and not like is that for the Phototaxis they will like the light more than they like dark since they prefer warm and well lit habitats. For the Thermotaxis experiment I predict they will go to the side that has the warmer temperatures…

● In this experiment, my lab partner and I wanted to examine the taxis of planarians. Taxis is an innate behavior behavioral response by an organism to a stimulus where an organism moves either towards the positive taxis or away from negative the taxis of the stimulus. There are different types of taxis which include chemotaxis, hydrotaxis, phototaxis, chemotaxis, and thigmotaxis. Phototaxis is a behavior in which the organisms show a spatial relationship to a source of stimulation, even…

proteins—is only 2 nm(15,18). Some components of flagellar apparatus are common to most bacterial species but significant deviation across bacterial species is also rarely observed. The study of various proteins throws light onto the evolutionary history of this notable organelle(15) .The expression of the components of the flagella at the appropriate time and within correct environment is controlled by a very complex yet remarkable regulatory system. The additional functions of flagella involve…