Daphnia

to compare the resting heart rate of a Daphnia, to its heart rate after 5 different substances were tested on it: Aspirin, Nasal Spray, Alka Seltzer, Coffee and Tea. Daphnia’s are often used as an experimental animal in lab settings because they are small, have a short life span and are easily maintained, only needing water to survive. For this specific lab, it was important that we have a test subject whose heart is visible under a microscope. The Daphnia was perfect because these water fleas…

Daphnias affected Heart Rate This lab experiment was conducted on Daphnias to test the chemical effects on its heart rate. In this experiment we determined the effects of caffeine and alcohol on the small organism. If the Daphnia is submerged in alcohol the heart rate will slow down, as if it’s submerged in caffeine it will speed up. The experiment measured how the stimulant caffeine or alcohol affected the Daphnia. The objective was to see how alcohol and caffeine would affect the…

Introduction The purpose of this experiment was to test whether or not the heart rate of a daphnia was effected by three different solutions being added: alcohol, lactic acid and, caffeine. We determined that when alcohol was added the heart rate would decrease. When lactic acid was added the heart rate would decrease, as well. When caffeine was added the heart rate would increase. We determined that alcohol would slow the heart rate because it is a depressant. Since humans that drink alcohol…

It can not be determined that ammonium sulfate can be used to find the LC50 of Daphnia Magna. In every trial, there was no data that was consistent or logical to be used to determine an accurate LC50. The LC50 is the point at which the concentration of a pollutant is lethal to 50% of the organisms. Static toxicity tests occur when the aquatic organisms are exposed to the same pollutant concentration for the duration of the test. The data in the first two trials had mostly 100% death rates…

This research proposal seeks to test the hypothesis that pesticide run-off from agriculture, even in small amounts, can have a devastating impact on the aquatic ecosystem, in particular that of Daphnia.  For years, pesticides have been known to have devastating impact on the ecosystems surrounding the agricultural centers they are used in. On a regular basis, run-off from farms that utilize both fertilizers and pesticides can seep into the watershed and slowly trickle into bodies of water…

natural alewife lakes, and not at all like the plankton of Crystal Lake before Alosa was a significant element in the open-water community. Crystal Lake in 1942 resembled the lakes without alewives in that its plankton was dominated by Diaptomus and Daphnia. Thus this showed that the majority of the zooplankton are less than about 0.6 millimeter in length when Alosa is abundant, whereas the majority of specimens of the dominant species in the same lake before Alosa…

activities of animals. Since temperature and the survival of an organism are strongly linked to each other, it is very important to understand how and why all living organisms are considerably affected by temperature. Unlike endotherms such as humans, daphnia and goldfish are perfect examples of ectotherms which rely mainly on environmental sources of heat to warm their bodies. They are also scientifically…

serotonin, norepinephrine and dopamine in various regions of the brain relative to the amount of aspartame consumption (Neonatal, 10). These responses, or lack thereof, pose potentially detrimental effects toward general behavior and physiology (Daphnia,…

TASK 4 CORRELATING STRUCTURE ACTIVITY RELATIONSHIPS Task 4 aims to develop knowledge of the relationship between the structure of ENMs and their toxicity. In this study, different kinds of metal oxide nanoparticles, carbon nanotubes, and graphenes will be tested their toxicities and then their structures and their toxicities will be found their correlations. For MONMs, different coatings of ZnO will be tested toxicities and observed the relationships, while differences in their sizes and…

(a) The Paramecium population in the lab (graph a) appears to have a logistical population growth. Visually, the data and trend line of the graph create an S-shaped curve, which is the shape of a logistical population growth. A logistical population growth is a population growth that initially occurs at a constant rate of increase over time, but then levels out as the carrying capacity of the environment is approached. For 10 days the population increases at a steady rate. However, after day 10…