Arsenate can replace inorganic phosphate in step 6 of glycolysis that produces 1,3-bisphosphoglycerate instead of glyceraldehyde 3-phospahte. This yields 1-arseno-3-phosphoglycerate instead, which is unstable and quickly hydrolyzes, forming the next intermediate in the pathway, 3-phosphoglycerate. This is the same product that is normally formed in step 7. This is a problem because the product forms before it should and therefore does not reach the enzyme so the energy released cannot be harvested to generated ATP. Arsenate wastes energy by the uncoupling phosphotransfer reaction so its very POISONOUS. However, glycolysis still proceeds. Arsenate can then also inhibit the conversion of pyruvate into acetyl-CoA, blocking the Krebs cycle and therefore resulting in further loss of ATP. …show more content…
Nevertheless, small changes in enzyme activities and affinities could be observed. For instance, arsenate can cause hexokinase to work slower. Next Slide (with graph)- Attached is the graph that shows the difference between the enzyme activities when phosphorus is used and when arsenic is used. As you can tell, the enzyme activity decreases when arsenic is added. At the level of the Krebs cycle, it primarily inhibits enzymes that require lipoic acid as a cofactor, such as pyruvate and alpha-ketogluterate dehydrogenase. This then inhibits the Krebs Cycle, which stops the production of reduced NAD (NADH). Therefore, arsenic poisoning kills by allosteric inhibition of essential metabolic enzymes, leading to death from multi-organ
The chemical elements are divided into two broad groups, the metals and the non-metals. In this experiment, you will examine some members of the metal group and identify similarities and differences in their physical and chemical properties. Metals are the elements that are found in the left of the periodic table with high electrical and thermal conductivity. Metals lose electrons to create positive ion charges. Metals have a unique shine, are prone to forming, have a high tendency to form cations, and combine with oxygen to give mostly basic oxides.
Lab 27. Stoichiometry and Chemical Reactions Report In our lab we were asked Which Balanced Chemical Equation Best Represents the Thermal Decomposition of Sodium Bicarbonate. Sodium Bicarbonate is a chemical compound with the formula NaHCO3, also known as baking soda. In the process to answer our guiding question we have to determine how atoms are rearranged during a chemical reaction.
Ursolic acid increases the enzymes, superoxide dismutase, glutathione reductase, glutathione s-transferase, and glutathione peroxidase and actual glutathione levels in the body substantially. This can reverse disrupted oxidative phosphorylation (OXPHOS) in the mitochondria. Disruption of ATP causes cells to revert to enzymatic ATP production through aerobic glycolysis in the cytoplasm, a process that can convert normal cells into cancer cells. Therefore, it’s an increase in enzymes and glutathione that helps to reverse the disrupted ATP production process to normal.
Secondary Energy Failure (Approx. 8-16 hours later) Decrease in high-energy phosphates impairs the Na+ / K+ pump and results in an acute influx of Na+, Cl-, and water Causes cell lysis & cytotoxic edema, and results in excessive release of excitatory neurotransmitters like glutamate (due to these receptors being permeable to Na+), as well as the generation of free radicals This triggers an “excitotoxic cascade”: Influx of Ca2+ & thus release of Ca2+ from intracellular stores, which activates enzymes to stimulate the production of excessive amounts of nitric oxide (results in NO neurotoxicity), which triggers the generation of free radicals & degradation of cellular lipids and proteins (and causes injury to the mitochondria ) Results in neuronal
ADME 1. The most common route of exposure to Arsenic: The primary routes of arsenic exposure are ingestion (about 80%) (Vahter, 2002) and inhalation. Ingestion most commonly occurs through consumption of food and water containing arsenic.
Glucose 6-phosphate dehydrogenase is the first enzyme in the pentose phosphate pathway. The pentose phosphate pathway is the major pathway cells use to generate NADPH, an important co-enzyme involved in oxidation/reduction reactions. One consequence of glucose 6-phosphate dehydrogenase deficiency is the premature death of red blood cells. This is because the lack of the enzyme leads to insufficient production of NADPH, which is needed to reduce glutathione, an antioxidant that helps protect red blood cells from oxidative stress by eliminating reactive oxygen species. Without glucose 6-phosphate dehydrogenase, reactive oxygen species accumulate which leads to the formation of aggregates of cross-linked hemoglobin and premature death in red
Properties of Ionic and Covalent Substances Lab Report Introduction The purpose of this lab was to determine which of the following substances: wax, sugar, and salt, are an ionic compound and which are a covalent compound. In order to accurately digest the experiments results, research of definitions of each relating led to the following information: ionic compounds are positive and negatively charged ions that experience attraction to each other and pull together in a cluster of ionic bonds; they are the strongest compound, are separated in high temperatures, and can be separated by polar water molecules. A covalent compound forms when two or more nonmetal atoms share valence electrons; covalent compounds are also
Acids are proton donors in chemical reactions which increase the number of hydrogen ions in a solution while bases are proton acceptors in reactions which reduce the number of hydrogen ions in a solution. Therefore, an acidic solution has more hydrogen ions than a basic solution; and basic solution has more hydroxide ions than an acidic solution. Acid substances taste sour. They have a pH lower than 7 and turns blue litmus paper into red. Meanwhile, bases are slippery and taste bitter.
INTRODUCTION: Arginase is an enzyme- enzymes are biological catalyst which drives a reaction at the speed of life. Arginase is a hydrolase, hydrolases catalyze hydrolysis reactions, this is determined via the E.C number (Nelson and Cox 2008). Arginase has the EC number is 3.5.3.1 (Schomburg 2015). The enzyme ‘commission number’ is the arithmetical classification that is used for enzymes which indicates the chemical reaction they catalyze.
This leads to lipid peroxidation and oxidative DNA loss but can interfere with physiology and intracellular signal transduction. The resulting change in intracellular redox status leads to the activation of protein kinase, for example, tyrosine kinase, protein kinase c, and the mario-activated protein kinase cascade leading to modified cellular functions. Oxidative stress compounds hypothyroidism. Hypothyroidism is a state that increases the oxidative stress. In this study, the biomarker is high in MDA level therapy-innocent primary hypothyroid patients.
Production of powerful oxidant, peroxynitrite (ONOO–) is considered as ‘reactive nitrogen species’ (RNS). Further this may further produce other reactive species similar to hydroxyl radical (•OH) however not always interaction between superoxide radical (•O2–) and nitric oxide (NO•) results in biologically harmful effect. During many enzymatic reaction, SOD-catalysed dismutation form O2 and hydrogen peroxide (H2O2) or it is formed by spontaneously reduction of two molecules of (•O2–). Hydrogen peroxide (H2O2) & superoxide radical (•O2–) enters into the cells in the same way as H2O enters. In the presence of transition metal ions like low molecular mass iron or copper,
Four of the total 47 patients with acute OP poisoning had obviously elevated Amylase and Lipase levels (Amylase> 300 U/L; Lipase >60 U/L). Only two of the patients with Amylase levels between 100 and 300 U/L had elevated levels of Lipase. None of the patients with normal Amylase levels had elevated levels of Lipase. A total of 12.76% were diagnosed as acute Pancreatitis (19). Pathology behind development of acute pancreatitis in patients after organophosphorous ingestion is not very clear.
Introduction The goal of the experiment is to examine how the rate of reaction between Hydrochloric acid and Sodium thiosulphate is affected by altering the concentrations. The concentration of Sodium thiosulfate will be altered by adding deionised water and decreasing the amount of Sodium thiosulphate. Once the Sodium thiosulphate has been tested several times. The effect of concentration on the rate of reaction can be examined in this experiment.
Abstract The unknown concentration of benzoic acid used when titrated with standardized 0.1031M NaOH and the solubility was calculated at two different temperatures (20◦C and 30◦C). With the aid of the Van’t Hoff equation, the enthalpy of solution of benzoic acid at those temperatures was determined as 10.82 KJ. This compares well with the value of 10.27KJ found in the literature.
Most of the research showed that the destruction of cell membrane is the main reason of inactivation. It has been also indicated that TiO2 can cause damage to Amino Acids and DNA. Researchers have suggested a number of mechanisms for this process. Based on the deconstruction of cell structure, the most important targets which can play a key role in inactivation process are extracellular and intracellular target sites. For extracellular target sites, the most convincing research showed that lipids are the major targets for oxidative radical attack.