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racemization

Examples

  • Wikipedia has an article on: Racemization. Wikipedia racemization (plural racemizations) (chemistry) The formation of a racemate from a pure Retrieved from "http:///wiki/racemization". — “racemization - Wiktionary”,
  • Racemization dating is a process which uses the measurement of the decay rate of carbon protein amino acids to date once-living organic tissue. — “Racemization Dating”,
  • Thaler has investigated racemization – the conversion of an optically active compound to a racemic form, which has no optical "Tracey's study is significant because it marks the first time that racemization has been looked on as a sign of life on other. — “Chemical reaction research to evaluate extraterrestrial samples”,
  • racemization resulted in overestimation of D-enantiomers and could lead to erroneous conclusions about the The range of racemization was determined with proteins and. — “Karl Kaiser and Ronald Benner. Hydrolysis-induced”,
  • A low tendency for racemization is a key requirement. This is especially true for solid phase peptide synthesis—quantitative yields with short reaction times are of Scheme 1: The benzotriazole derivatives HOBt and HOAt are commonly used additives to suppress racemization in peptide coupling reactions. — “COMU – Safer and More Efficient Peptide Coupling Reagent”,
  • is a not-for-profit web portal set up by It was set up following the GSA session in 2003 in honour of Glenn Goodfriend, one of the most innovative uses of the technique, who found application of amino acid racemization in areas most of use would not have imagined. — “racemization”,
  • Of these, temperature is generally thought to play the most significant role in determining the rate of racemization since a 1o increase in temperature results in a 2025% increase in the racemization rate.1,2 Clearly, this factor alone carries with it a huge potential for error. — “Amino Acid Racemization Dating”,
  • Amino acids complete the racemization process when the amounts of L and D amino acids are equal. As a dating technique, racemization has practical application in the fields of Archaeology, Geochemistry, Marine Geology,. — “Electron Spin Resonance Dating”, mnsu.edu
  • Recently, we have developed highly efficient DKR protocols for secondary alcohols in which the traditional enzymatic resolution is combined with an "in situ" racemization of the substrate using a ruthenium(II) racemization catalyst (1) at ambient temperature (Figure 1).[32,34]. — “Beilstein Journal of Organic Chemistry | Full text | Large”,
  • Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. Definition of RACEMIZATION : the action or process of changing from an optically active compound into a racemic compound or mixture. — ra·ce·mize\rā. — “Racemization - Definition and More from the Free Merriam”, merriam-
  • Definition of racemization in the Online Dictionary. Meaning of racemization. Pronunciation of racemization. Translations of racemization. racemization synonyms, racemization antonyms. Information about racemization in the free online English. — “racemization - definition of racemization by the Free Online”,
  • Creation Ministries International, home of Creation Magazine; scientific evidence supporting Genesis Krenvolden, et al, Racemization of Amino Acids in Sediments from Saranich Inlet, British Columbia', Science, Vol. 169, September 1970, pp. 1079–1082. — “Shaking hands on a recent creation”,
  • racemization n. Conversion of an optically active substance to a racemic form. — “racemization: Definition from ”,
  • Definition of racemization in the Medical Dictionary. racemization explanation. Information about racemization in Free online English dictionary. What is racemization? Meaning of racemization medical term. What does racemization mean?. — “racemization - definition of racemization in the Medical”, medical-
  • Definition of racemization from Webster's New World College Dictionary. Meaning of racemization. Pronunciation of racemization. Definition of the word racemization. Origin of the word racemization. — “racemization - Definition of racemization at ”,
  • Racemization information including symptoms, causes, diseases, symptoms, treatments, and other medical and health issues. — “Racemization - ”,
  • The process by which an optically active substance is transformed into the corresponding racemic modification is known as racemization; the converse process, by which a racemic modification is separated into the two enantiomorphs, is known as resolution. — “racemization (chemistry) -- Britannica Online Encyclopedia”,
  • At a widely publicized news conference in August of 1972, Dr. Jeffrey Bada of Scripps Institute of Oceanography announced the "discovery" of a new dating method based on the rate of racemization of amino acids in fossil material. He was quoted as. — “The Amino Acid Racemization Dating Method”,
  • However, as soon as the creature dies, the L-amino acids start to spontaneously convert to the D-form through a process called "racemization". If the rate of conversion can be determined, this process of racemization might be useful as a sort of "clock" to determine the time of death. — “Amino Acid Racemization Dating”,
  • By ***yzing how much racemization of its aspartic acid occurred, scientists can determine how old the tooth's owner was at death — generally By the way, if you're curious about why racemization is so much less accurate a clock than C-14 for dating a tooth's age, part of. — “Teeth As A Forensic Clock - Science News”,
  • The rate of racemization (from L-forms to a mixture of L-forms and D-forms) has been used as a way of dating biological samples in tissues with slow rates of turnover, forensic samples, and fossils in geological deposits[citation needed]. [edit] References ^ Brignole, Ed. — “Racemization - Wikipedia, the free encyclopedia”,
  • These are important to amino acid dating because racemization occurs much faster Other extreme environment studies concern racemization. repair mechanisms in extreme cold dormant states and hydrothermal vent. — “Amino Acid Racemization”,

Videos

  • Accidents & Irony Strength team: "You are not an accident. Nobody in this gym is an accident. Somebody created each of you with an important purpose." It disturbs me when creationists equate a world without god to an existence where all things are accidental. It doesn't so much disturb me because I find the idea of an ungoverned existence frightening, or even that they don't understand that an ungoverned existence does not equate to one with no order, rules of probability and/or basic structure - you know, like natural laws. The truly disturbing part of that false equivalency is the scientific ignorance that makes Creationists blind to their own irony. Their position of a God creating us just as we are today, and the planet six to eight thousand years ago requires them to consider a myriad of individually clarified pieces of scientific evidence from multiple disciplines to be circumstantial and accidental. It's the creationist position that requires it to be an accident or coincidence that chimpanzee and human genomes are more than 98% identical, and that fossils from around the world have been independently discovered, dated, and studied- contradicting biblical claims about earth-age and species development. It's they who believe earth dating techniques including carbon , dendrochronology, amino acid racemization, palomagnetic and others performed by separate scientists in separate locations consistently yield remarkably similar results about the age of our planet ...
  • Enols and tautomerism (2) Organic chemistry: Enols and enolates; tautomerism. Racemization at an α-carbon; deuterium exchange at an α-carbon. Enols as nucleophiles; acid-catalyzed α-halogenation. Boiling point of aldehydes and ketones This is a recording of a tutoring session, posted with the student's permission. These videos are offered on a "pay-what-you-like" basis. You can pay for the use of the videos at my website: www.freelance- For a list of all the available video series, arranged in suggested viewing order, go to my website. For a playlist containing all the videos in this series, click here: (1) Enols and enolates (2) Continued. Tautomerism (3) Continued (4) Continued (5) Continued (6) Continued. Racemization at an α-carbon (7) Continued. Deuterium exchange at an α-carbon (8) Continued. Enols as nucleophiles (9) Acid-catalyzed α-halogenation (10) Continued. Boiling point of aldehydes and ketones
  • IE Organic Lecture 9.2 - Stereoisomers & Energy, Racemizatio Diastereomers are different in energy; enantiomers are equal in energy. This fact forms the basis for most of organic chemists' thinking about reactions involving stereoisomers. Learn more about this idea, and about the interconversion of enantiomers (racemization), in this video. For more free educational content, visit .
  • RATE (Radioisotopes And The Age of the Earth) New Findings Show Flaws In Old-Earth Dating Methods - By measuring amounts of different products of radioactive decay, scientists have discovered that a process called "accelerated nuclear decay" must have occurred—in other words, the rate that elements decay in rocks was sped up in the past, making it much faster than we see today. Tune in to part two of our series to learn how they came to this conclusion—and how this is powerful evidence for a young earth. New Rate Data Support a Young World - . What Comes after RATE? - . The Amino Acid Racemization Dating Method - . Consequences of Time Dependent Nuclear Decay Indices on Half Lives - . Quotes by Evolutionary Scientists Against Evolution - Live broadcasting with instant message - www.justin.tv KJV1611 Bible -
  • Following DrSim0n's Trail of Absurdity Illustrations courtesy of linkmeup2003... Here are my points... in order of appearance: 1. My point was that it wouldn't be extremely unlikely for the microspheres to run into a single tar versus them clumping together and "going away" because they are in the *ocean*, surrounded by a lot of water, and would have to find each other to clump together. If you argue that they still *will* find each other... then you must concede that the nucleotides will "find each other" as well... and while it might take a little longer to bond than tars, they will still be bonding together. They will then not be able to get into the microsphere because the chain of nucleotides is too big. 2. Your article speaks about *only* hexose... and then it goes on to say that it *might* be able to explain a *theoretical* basis for a *plausible* mechanism behind the homochirality of ribose and deoxyribose. That means that nucleotides *can* form into a pure-D mixture naturalistic ally? Nope... just that they really believe it, and are willing to jump to that conclusion based upon nothing but a guess. Nice try... And then if you say that they are *catalysts*, and that it would just take more time to catalyze ribose or deoxyribose, then why can't they demosntrate a *small* change over a *small* time. And then... if it takes a *super* long time, you have to worry about racemization. 3. A philosopher, or mathematician, who creates a theory like ID which is falsifiable, and can be falsified by observations ...
  • Enols and tautomerism (1) Organic chemistry: Enols and enolates; tautomerism. Racemization at an α-carbon; deuterium exchange at an α-carbon. Enols as nucleophiles; acid-catalyzed α-halogenation. Boiling point of aldehydes and ketones This is a recording of a tutoring session, posted with the student's permission. These videos are offered on a "pay-what-you-like" basis. You can pay for the use of the videos at my website: www.freelance- For a list of all the available video series, arranged in suggested viewing order, go to my website. For a playlist containing all the videos in this series, click here: (1) Enols and enolates (2) Continued. Tautomerism (3) Continued (4) Continued (5) Continued (6) Continued. Racemization at an α-carbon (7) Continued. Deuterium exchange at an α-carbon (8) Continued. Enols as nucleophiles (9) Acid-catalyzed α-halogenation (10) Continued. Boiling point of aldehydes and ketones
  • Organic Chemistry Rap Just a little Organic Chemistry rap I made this summer Produced by Shawn Jahan /shawnjahan MP3 Download: Lyrics: I didn't make the A, but I can still remember the name Of every carbon based molecule that you could create Just dots and lines to memorize, flying into my eyes I can synthesize in half the time that it takes for you to draw a bond of pi That's two lines drawn through the middle of a row of C's ...Because I know the E's, I know my SP's, my SP2's and my 3's And the international union of pure and applied chemistry sucks! For making my life a living hell with all the rules they made up We've got enantiomers, diastereomers, I know it probably sounds like I'm just throwing out words And when I'm cooking my dinner and the smells start brewing I can't help but think of Huckel and his silly old rules Yeah, it's the ochem song I should probably be studying but this is more fun But the sound waves look like an NMR And I still can't tell if my clock is S or R Yeah, it's the ochem song I should probably be studying but this is more fun But the sound waves look like an NMR And I still can't tell if my clock is S or R Alkenes, alkynes, alkanes, they all sound the same! It's just a couple of letters in there differentiating the name And I have to admit the one that I hated most was probably epoxides Because it's hard to know a structure when it's coming in from all sides! But my favorite may have been deprotonation via claisen It's a two way tie ...
  • 28. Stereochemical Nomenclature; Racemization and Resolution Freshman Organic Chemistry (CHEM 125) Determination of the actual atomic arrangement in tartaric acid in 1949 motivated a change in stereochemical nomenclature from Fischer's 1891 genealogical convention (D, L) to the CIP scheme (R, S) based on conventional group priorities. Configurational isomers can be interconverted by racemization and epimerization. Pure enantiomers can be separated from racemic mixtures by resolution schemes based on selective crystallization of conglomerates or temporary formation of diastereomers. Complete course materials are available at the Open Yale Courses website: open.yale.edu This course was recorded in Fall 2008.