2. Do background research – Utilizing at least one scholarly source, describe how variations in dissolved oxygen content in a body of water can affect fish populations. Answer = “Oxygen depletions are the most common cause of fish kills in ponds. (Aquaplant, 2014).” Based on my observation of the chart and what I read, the higher the dissolved oxygen levels the number of fish drops. Dissolved oxygen levels can also cause fish to suffocate and be more susceptible to diseases.
The herbicidal activity of disodium methanearsenate is when it reacts with sulfydryl group ( S-H group ) in the amino acid cysteine. When cysteine in plant enzymes reacts with arsenical compound it inhibits the function of enzyme causing the death of the plant. Unfortunately, similar chemical effects as well occur in animals. The investigators collected samples of discoloured grass as well as organs of deer for the determination of the presence of arsenic acid and its concentration. According to the publication of Association of Official Analytical Chemists common method for quantitative determination of arsenic compound is through distillation of arsenic as arsine and concentration can be determined through colorimetric measurements.
Jack Xia 2nd period A day Apes Effect of pH on Crayfish Growth Ecostudy In this study, the effect of ph on crayfish growth will be investigated. This experiment will help scientists understand how different levels of PH can have a negative or positive effect on organisms, specifically crayfish. This study could ultimately help scientists further understand the importance of wetlands and how environmental changes in the wetlands can affect the organisms that live in it. The experiment itself will analyze the effects of PH’s on the growth of crayfish by conducting a careful, controlled experiment that specifically targets the two variables. In this experiment, the PH is the independent variable, as it is predetermined based on the experiment and is not effected by anything else.
Determination of the Cause of a “Fish-Kill” in the Clark Fork of the Columbia River Introduction: The Clark Fork of the Columbia River has been experiencing large fish kills possibly due to the presence of Group IA IIA and IIIA metal ions (Na+, K+, Li+ Ca2+, Ba2+, Sr2+, Cu2+, and Fe2+). Ions such as these contribute to the salinity and/or toxicity of the water. Water that is either too salty or too toxic may cause fish kills. This experiment will show what ions are present in a sample of the contaminated water and determine if the ions present are at toxic levels. Water samples from the Clark Fork have been taken and will be tested using both absorption and emissions spectroscopy in order to check the levels of group IA and IIA metal ions.
The island is infected with the virus ANSD so these scientists have to carefully unfold this mystery. Throughout the book Dr. Blum and his medical team perform different tests on the infected ones to better understand what is the difference between the humans and the zombies. This would help them know of the human is already infected so they can have an idea whether it is “human” or “No longer human”. In order to see what the virus is capable of, the medical dissects the zombie brains, hearts, lungs, skin, and digestive system. After all this was performed, drawings were made to help give a better idea and supply more details of all the internal organs.
Contamination with pathogenic bacteria from the human/animal reservoir can occur when the landing place is unhygienic or when the fish are washed with contaminated water. Upon the processing of fish, its exposure to water is a critical part as pathogens may be present in the water used which can cause contamination and spoilage (Shoolongela & Schneider, 2012). Contamination of food can occur because of problems in food production, preparation, storage or cooking. The aquatic environment and soft tissue of fishes make it extremely susceptible to microbial contamination. Contamination commonly occurs in the environment in which the seafood (fish) is usually caught, during harvesting, and preparation (Wekell, Manger, Kolburn, Adams & Hill, 1994).
Grade 8 Science Name: Date: Period: The Decomposition of Water Lab Due: Question: Does a chemical or physical change take place when an electric current is passed through water? Hypothesis: _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ Materials: 2 test tubes 1 beaker peg board 2 rubber stoppers 2 electrodes power supply with leads electrolyte water paper towel wood splint matches NaOH Procedure: see “Teacher Notes” Apparatus: See attached paper Results Qualitative Observations: ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ Quantitative Observations: ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ Quantitative Observations from the class (chart of hydrogen/oxygen ratio) Conclusion Questions: 1. Does passing an electric current through water cause a chemical
Megan Jackson English 201 Bauman September 14, 2015 “Human-Animal Food Web” Sandra Steingraber wrote “Tune of the Tunafish” as to raise awareness about the mercury in seafood. There is an especially heavy concern towards the high levels which are in tuna fish, Steingraber says. High mercury content in fish has been known to have many negative effects on the human body. Some of these negative effects can be very serious and threatening, especially when considering neurological health. As Steingraber stated in her story, “Mercury has been shown to paralyze migrating brain cells and hold back their cell division.
The bone has to be cleaned up so they can avoid any containments then part of the bone is crushed up into pieces. With those pieces they need to fast-track the process of chemical reaction which they use hydrochloric acid, so it can dissolve the hard layer of the bone. Gelatinisation is the second part of the process the bone goes into so the archaeologists can figure out the radiocarbon age. This process helps the bone remove all the containments so it can turn into a texture that always the water to be used in sequences of chemical reactions to change all carbon atoms that remains in the bone into benzene. Scintillator chemical is added into the liquid benzene with that going they connect it to a liquid scintillator spectrometer to count per minute of the decays that occurred.
The Consequences of Overfishing Overfishing has been identified across the world as a prominent environmental issue. Fish and other marine animals, such as sharks, sea turtles and dolphin, are retrieved from the oceans through indiscriminate fishing practices at a rate that cannot be sustained by natural reproduction (Jackson, 2001). Systematic overfishing with bottom trawling, dredges, and drift nets depletes the ocean of innumerable species at an alarming rate and alters the ecological balance in marine environments. The actions of shortsighted commercial fishermen have brought tremendous adverse environmental and economic consequences upon the entire world. The continuation of unrestricted fishing will worsen world hunger among impoverished coastal communities, many of whom depend on the abundance of fish to feed themselves and their families, and result in ultimate environmental chaos and the extinction of thousands of In recent years, the demand for fish, a healthy food rich in omega-3 fatty acids and lean protein, has sky-rocketed.