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Topic: Enzyme


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In the News (Wed 17 Apr 19)

  
  Enzyme K-12 Experiments for Lesson Plans & Science Fair Projects
Enzymes are essential to sustain life because most chemical reactions in biological cells would occur too slowly, or would lead to different products without enzymes.
Enzymes are usually specific as to the reactions they catalyze and the substrates that are involved in these reactions.
Enzymes are very specific and it was suggested by Emil Fischer in 1890 that this was because the enzyme had a particular shape into which the substrate(s) fit exactly.
www.juliantrubin.com /encyclopedia/biochemistry/enzyme.html   (3580 words)

  
 Enzyme Classification
It is recommended that for enzymes that are not the main subject of a paper or abstract, the common names should be used, but they should be identified at their first mention by their code numbers and source.
In the light of the fact that enzyme names and code numbers refer to reactions catalysed rather than to discrete proteins, it is of special importance to give also the source of the enzyme for full identification; in cases where multiple forms are known to exist, knowledge of this should be included where available.
Similarly, when any enzyme acts on more than one substrate (or pair of substrates), the name should normally refer only to one substrate (or pair of substrates), although in certain cases it may be possible to use a term that covers a whole group of substrates, or an alternative substrate may be given in parentheses.
www.chem.qmul.ac.uk /iubmb/enzyme/rules.html   (5788 words)

  
  enzyme - Encyclopedia.com
The first enzyme molecule to be isolated in pure crystalline form was urease, prepared from the jack bean in 1926 by American biochemist J. Sumner, who suggested, contrary to prevailing opinion, that the molecule was a protein.
The efficiency of an enzyme's activity is often measured by the turnover rate, which measures the number of molecules of compound upon which the enzyme works per molecule of enzyme per second.
For example, in the enzyme trysin, its complex tertiary structure brings together a histidine residue from one section of the molecule with glycine and serine residues from another.
www.encyclopedia.com /doc/1E1-enzyme.html   (1793 words)

  
 REACTIONS & ENZYMES
Enzymes can act rapidly, as in the case of carbonic anhydrase (enzymes typically end in the -ase suffix), which causes the chemicals to react 107 times faster than without the enzyme present.
The functioning of the enzyme is determined by the shape of the protein.
The enzymes in a series can be located adjacent to each other (in an organelle or in the membrane of an organelle), thus speeding the reaction process.
www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookEnzym.html   (1582 words)

  
 "Enzyme Deficiency"
Enzymes are responsible for constructing, synthesizing, carrying, dispensing and delivering the many ingredients and chemicals our body uses in its daily business of living.
The enzymes of this blend may work in the laboratory but do not act after ingestion because they would be inactivated (and digested) themselves, along with any other proteins consumed.
Enzymes found in food are digested by the stomach and do not participate in the digestive process.
www.quackwatch.org /01QuackeryRelatedTopics/PhonyAds/mp.html   (2519 words)

  
  Enzymes, Kinetics and Diagnostic Use
Plasma membrane enzymes regulate catalysis within cells in response to extracellular signals, and enzymes of the circulatory system are responsible for regulating the clotting of blood.
Enzymes composed wholly of protein are known as simple enzymes in contrast to complex enzymes, which are composed of protein plus a relatively small organic molecule.
The enzymes known as racemases provide a striking exception to these generalities; in fact, the role of racemases is to convert D isomers to L isomers and vice versa.
web.indstate.edu /thcme/mwking/enzyme-kinetics.html   (5759 words)

  
  Enzyme - Wikipedia, the free encyclopedia
Enzymes are usually specific as to the reactions they catalyze and the substrates that are involved in these reactions.
Enzymes are very specific and it was suggested by Emil Fischer in the 1890s that this was because the enzyme had a particular shape into which the substrate(s) fit exactly.
Malonate is a competitive inhibitor of the enzyme succinate dehydrogenase, which catalyzes the oxidation of succinate to fumarate.
en.wikipedia.org /wiki/Enzyme   (3054 words)

  
 enzyme. The Columbia Encyclopedia, Sixth Edition. 2001-05
The first enzyme molecule to be isolated in pure crystalline form was urease, prepared from the jack bean in 1926 by American biochemist J. Sumner, who suggested, contrary to prevailing opinion, that the molecule was a protein.
The efficiency of an enzyme’s activity is often measured by the turnover rate, which measures the number of molecules of compound upon which the enzyme works per molecule of enzyme per second.
For example, in the enzyme trysin, its complex tertiary structure brings together a histidine residue from one section of the molecule with glycine and serine residues from another.
www.bartleby.com /65/en/enzyme.html   (841 words)

  
 Enzyme Info - Encyclopedia WikiWhat.com   (Site not responding. Last check: )
In biology, an enzyme (from Greek: "in ferment") is a protein, or assemblage of protein molecules, which facilitates (and/or accelerates) a biochemical reaction; enzymes are a form of catalyst.
Enzymes are large proteins that catalyze (accelerate) chemical reactions.
Enzymes are usually specific as to the reactions they catalyze and the chemicals (substrates) that are involved in the reactions.
www.wikiwhat.com /encyclopedia/e/en/enzyme.html   (1766 words)

  
 Bugs in the News - What the Heck is an Enzyme?
An enzyme, like all strictly-defined catalysts, is therefore said to lower the energy of activation of a reaction; but, the catalyst is not changed in any way in the process - kind-of like a conduit - a path through which reactions occur.
Therefore, when the atoms of molecules are acted upon by enzymes, an identical reaction occurs as would have occurred without the enzyme, but, the energy hill required to overcome the getting-close barrier, is much, much smaller than would have been true without the enzyme's help.
An enzyme is required to digest the lactose and to convert it into glucose and galactose (we use both).
people.ku.edu /~jbrown/enzyme.html   (1409 words)

  
 Digestive Enzymes - Vitacost   (Site not responding. Last check: )
In a double-blind study, microencapsulated pancreatic enzymes were shown to reduce gas, bloating, and fullness after a high-fat meal.
Proteolytic enzymes may also improve immune system function, for example, in people with shingles (herpes zoster), though this area of research has not been adequately explored.
The plant-based proteolytic enzyme bromelain comes from the stems of pineapples and is useful in many conditions.
www.vitacost.com /science/hn/Supp/Enzymes.htm   (1438 words)

  
 Introduction to enzyme kinetics
Enzymes are catalysts which reduce the needed activation energy so these reactions proceed at rates that are useful to the cell.
Rather than fit the enzyme progress curve, most analyses of enzyme kinetics fit the initial velocity of the enzyme reaction as a function of substrate concentration.
In defining enzyme concentration, distinguish the concentration of enzyme molecules and concentration of enzyme sites (if the enzyme is a dimer with two active sites, the molar concentration of sites is twice the molar concentration of enzyme).
www.curvefit.com /introduction63.htm   (1108 words)

  
 Drug Discovery & Development   (Site not responding. Last check: )
The enzyme is conjugated to an antibody that is specific for the antigen to be detected.
The stabilization of the active structure of an enzyme by binding with antibodies.
An inactive enzyme precursor that is activated by proteolysis; a zymogen.
www.dddmag.com /scripts/Glossary.asp?RPTID=KWSRCH&SEARCHMETHOD=WORD&SEARCHWORD=Enzyme   (472 words)

  
 Enzyme Practice Quiz/AP Biology   (Site not responding. Last check: )
The substrate bonds to a specific area on the enzyme molecule known as the enzyme's _______________.
Compounds similar in shape to an enzyme's substrate, that can compete with the substrate molecules by binding with the active site of the enzyme are said to be _______________.
An enzyme is generally named by adding ____ to the end of the name of the _____.
www.ekcsk12.org /science/apbio/enzymeqz.html   (1338 words)

  
 Enzymes
Enzymes bind temporarily to one or more of the reactants of the reaction they catalyze.
The enzyme is antibacterial because it degrades the polysaccharide that is found in the cell walls of many bacteria.
In either case, the chain is broken, the two fragments separate from the enzyme, and the enzyme is free to attach to a new location on the bacterial cell wall and continue its work of digesting it.
users.rcn.com /jkimball.ma.ultranet/BiologyPages/E/Enzymes.html   (1853 words)

  
 AllRefer Health - Enzyme
Enzymes are complex proteins that cause a specific chemical change in other substances without being changed themselves.
Enzymes can be found in every organ of the body.
Enzymes exist in the mouth (saliva), stomach (gastric juice), and intestines (pancreatic juice, intestinal juice, and intestinal mucosa).
health.allrefer.com /health/enzyme-info.html   (280 words)

  
 enzyme - Definitions from Dictionary.com
Enzymes are usually very selective in the molecules that they act upon, called substrates, often reacting with only a single substrate.
Enzymes can speed up chemical reactions by up to a millionfold, but only function within a narrow temperature and pH range, outside of which they can lose their structure and become denatured.
Enzymes are involved in such processes as the breaking down of the large protein, starch, and fat molecules in food into smaller molecules during digestion, the joining together of nucleotides into strands of DNA, and the addition of a phosphate group to ADP to form ATP.
dictionary.reference.com /browse/enzyme   (467 words)

  
 Enzymes, Digestive Enzymes - Enzymedica - Enzyme Experts for Candidase, Lactase, Nattokinase, Amylase & More - ...
Kids Digest ™ is a mild potency digestive enzyme formula, which covers all food groups.
We are dedicated to providing you with superior quality enzymes at the most therapeutic levels.
In addition to the digestive enzymes that is on average 6 times stronger than our competitors, Enzymedica has a high amylase, high protease, and high lipase product.
www.enzymedica.com   (411 words)

  
 HowStuffWorks "How Cells Work"
The purpose of an enzyme in a cell is to allow the cell to carry out chemical reactions very quickly.
When an enzyme is formed, it is made by stringing together between 100 and 1,000 amino acids in a very specific and unique order.
The maltase enzyme is a protein that is perfectly shaped to accept a maltose molecule and break the bond (2).
science.howstuffworks.com /cell2.htm   (666 words)

  
 Enzyme Therapy and Cancer
By Nicholas Gonzalez, M.D. The Scottish embryologist, Dr. John Beard, proposed in 1906 that the pancreatic proteolytic enzymes represent the body's main defense against cancer, and would be useful as a treatment for all types of cancer.
Beard believed the enzymes had to be injected, to prevent destruction by hydrochloric acid in the stomach.
The animal glandular products and pancreatic enzymes that we use are derived from animals raised in Australia and New Zealand, where there has been no history of BSE (mad cow disease) or other prion diseases such as scrapie.
www.dr-gonzalez.com /history_of_treatment_txt.htm   (2260 words)

  
 Enzymes, Inc. Home - Digestive Enzyme Supplements to Improve Health through Nutrition
Enzymes, Inc. has been formulating, marketing and distributing enzyme supplements for over two decades.
While protease is present in digestive enzyme formulations and taken with meals, protease has also shown to have beneficial effects on immune and inflammatory processes.
To optimize the ability of the body to assimilate nutrients, in addition to improving the function of enzymes, healthy intestinal flora is recommended.
www.enzymesinc.com   (297 words)

  
 Enzyme Nomenclature
Each enzyme has recorded at the end details of when first published in Enzyme Nomenclature or when added to the database and its subsequent history.
For other enzymes a glossary entry has been added which may be just a systematic name or a link to a graphic representation.
In Enzyme Nomenclature 1992 there was a section on general principles; recommended and systematic names; scheme of classification and numbering of enzymes; and rules for classification and nomenclature.
www.chem.qmul.ac.uk /iubmb/enzyme   (905 words)

  
 More Mechanisms: A Model of Enzyme Kinetics
Enzymes are astounding catalysts that are highly specific for a particular reaction while being extremely versatile at times.
Thus, Brown demonstrated that this enzyme invertase: was not a required ingredient in the stoichiometric reaction, was not consumed as a result of the reaction, increased the rate of the reaction due to its presence.
In brief, this enzyme was serving as a catalyst.
dept.physics.upenn.edu /courses/gladney/mathphys/subsection4_1_6.html   (1769 words)

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