Quaternary ammonium compounds‚ QAC‚ are ingredients found in household products such as fabric softeners‚ detergents‚ disinfectants‚ and hair products that consist of dialkyldimethylammonium compounds (DADMC)‚ benzylalkyldimethylammonium compounds (BAC) and alkyltrimethylammonium compounds (ATMAC) (Li and Brownawell 2010). While trying to find the reason why these rivers keep getting contaminated‚ Brownawell found out that the wastewater areas found in surficial sediments around the Hudson River
Premium Fabric softener Concentration
Yentl Smith BIOL 3810-504 Compound Action Potentials Date Performed: 15FEB2011 Date Due: 01MAR2011 Introduction Neurons are the cells that receive and transmit electrical signals (University of North Texas‚ 2010). The ability of the neuron to conduct these impulses is because of an electrochemical voltage across the plasma membrane of that neuron. An action potential is an all or nothing response to a stimulus along a single axon. A compound action potential is a graded response that
Premium Action potential Neuron
nitrateAmmonium Nitrate How they are manufactured? Ammonium nitrate is made commercially by passing ammonia gas (NH3) and a water solution of nitric acid (HNO3) through a pipe. The ammonia combines with the nitric acid to form ammonium nitrate. The formula for this reaction can be written as NH3 + HNO3 → NH4NO3. Large amounts of heat are released during the reaction‚ so the pipe and supporting equipment must be very strong. The solution of ammonium nitrate in water is allowed to evaporate‚ leaving
Premium Ammonia
functional neuron carries important information through action potential‚ this is significant activity of the neurons to allow us to understand abnormality in the nerve that cause disorders. The objective of this study was to trigger a compound nerve action potentials (CAPs) and examine the effects of a stimulus voltage on a nerve and inspect their threshold‚ refractory period and also their velocity. Compound nerve action potentials (CAPs) are summed action potential of one nerve‚ one nerve consists of many
Premium Action potential
appropriate citation style.The last protein structure to mention is quaternary (4º). This type of structure refers to the arrangement of subunits and to the nature of the subunits interactions. To sum this up proteins that consist of more than one polypeptide chain will display quaternary structure. Each individual polypeptide chain in a protein is referred to as a subunit. A dimer is known to be the simplest sort of quaternary structure as it
Premium Metabolism Photosynthesis Cellular respiration
Quaternary Period 2 to 0 Million Years Ago Summary The Quaternary Period began about 1.8 million years ago and consists of two epochs: The Pleistocene Epoch‚ which is 1.8 million to 11‚000 years ago‚ and The Holocene Epoch‚ which is 11‚000 years ago to present. During this time there was very little movement of the continents themselves (Figure 1.3). During this period there were repetitive cycles of cold and warm climate that created the advancing and retreating of ice sheets. The moving of
Premium Glacier
SCIENCE REPORT AMMONIUM NITRATE NH4NO3 Problem Our task was to investigate what the optimum ratio of solute to solvent that will produce the maximum cooling/heating effect? Hypothesis With a smaller quantity of water (50mls) and the same amount of Ammonium Nitrate added. After any period of time the mixture will be a cooler temperature than that of a mixture with a larger quantity of water. Variables X Water X Teaspoons X Time X Ammonium Nitrate X Thermometer X Stirring
Premium Measurement Ammonia Time
fundamental unit of the nervous system. These neurons work together with other excitable cells to produce action potentials when they receive electrical or chemical stimuli. Action potentials can be thought of as an “all-or-nothing” event and occur as a large-scale depolarization when sodium and other positive ions rapidly enter the neuron through membrane channel proteins. Once initiated‚ action potentials travel down the length of the axon and when it reaches the end a neurotransmitter is released
Premium Neuron Action potential Axon
appearance‚ but most importantly there was the catastrophic extinction event of many species near the end of the Quaternary period. The event had a great effect on the species roaming on Earth. The Quaternary extinction event was caused by factors such as global climate fluctuations which pushed many to adaptation and others to extinction. It’s also plausible that hunters contributed to the Quaternary extinction by causing local extinctions. After the last ice age‚ the ecosystem was greatly impacted and a
Premium Global warming Climate change Carbon dioxide
Causes For The Quaternary Extinction Event The quaternary extinction event happened about 10‚000–40‚000 years ago. This even is when megafaunal animals went extinct. This event saw the extinction of more than 178 species. Megafaunals are defined as “A term generally used to refer to the largest animals present within an ecosystem‚ most often used with respect to the array of large-bodied species which suffered extinction during the Quaternary. A strict definition refers to animal species weighing
Premium Extinction Dinosaur Human