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Topic: Trimer (chemistry)

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In the News (Wed 17 Jul 19)

They used a porphyrin trimer catalyst that is inspired by biological enzymes.
The catalyst we studied is built with a porphyrin trimer motif.
The shape of this trimer is described in figure 2.2.
www.ch.ic.ac.uk /rzepa/watoc96/abstracts/39/Watoc.html   (492 words)

  trimer | | Dictionary & Translation by Babylon
Ein Trimer ist ein Molekül, das aus drei Untereinheiten, den Monomeren, besteht (vergleiche dazu: Dimer).
Trimer is een gemeente in het Franse departement Ille-et-Vilaine (regio Bretagne) en telt 161 inwoners (2005).
Trimer è un comune francese di 102 abitanti situato nel dipartimento di Ille-et-Vilaine nella regione della Bretagna.
www.babylon.com /definition/trimer/All   (302 words)

 trimer - OneLook Dictionary Search
trimer : Encarta® World English Dictionary, North American Edition [home, info]
trimer : Compact Oxford English Dictionary [home, info]
trimer : Dorland's Illustrated Medical Dictionary [home, info]
www.onelook.com /?w=trimer&ls=a   (152 words)

 Trimer (chemistry) Encyclopedia   (Site not responding. Last check: )
In chemistry a trimer is a reaction product of three identical molecules.
Chemical compounds that very easily form trimers are aliphatic isocyanates and cyanic acids as an early intermediate in a polymerisation process, see also oligomers.
Second are sulphonic-acid-modified trimers which give dispersibility similar to polyether-modified trimers coupled...
www.hallencyclopedia.com /topic/Trimer_(chemistry).html   (125 words)

 Joyce (Higgins)Easter's Publications
The localization of a G-protein to the plasma membrane, as well as its interaction with the appropriate receptor and effector, are essential for its function.
In addition, the association of a G-protein's subunits to form its trimer is required for interaction with its receptor.
Recent advances which elucidate the contributions that the post-translational modifications of the gamma subunit have on the assembly, membrane association, and function of the G-protein trimer reveal that these modifications are required for important protein-protein, in addition to membrane-protein, interactions.
facultystaff.vwc.edu /~jeaster/pubs.html   (1295 words)

 Investigations of Ultrafast Exciton Dynamics in Allophycocyanin Trimer
On the basis of this approximation, we construct a vibronic model, which describes the six chromophores in the APC trimer.
We analyze the absorption and CD spectra of the APC trimer, as well as oscillatory behaviors appearing in the pump-probe profiles and kinetics observed in the femtosecond anisotropy profile.
Photorelated biosystems like the APC trimer may achieve an efficient IC by adjusting the electronic energy gap, promoting mode and vibronic coupling constant due to the breakdown of adiabatic approximation.
pubs.acs.org /cgi-bin/abstract.cgi/jpcafh/2001/105/i39/abs/jp011266a.html   (307 words)

Thiazyl chloride (N≡SCl) thermally derived from the preformed trimer and that made from the interaction of urethane, thionyl chloride and pyridine in benzene (Katz reagent) react somewhat differently with dibenzoyl –ethane, -ethene (E and Z) and –ethyne.
The close parallel between the action of this mixture and of thiazyl chloride [which is in equilibrium with its trimer 1 in solution] generated from its trimer is not always observed however, particularly when the substrate can react with thionyl chloride or ethyl carbamate, as the following results show.
Thus we see that differences are to be expected in the reactions of trimer 1 and Katz reagent where the substrate reacts irreversibly with thionyl chloride, for example by cyclodehydration, or with ethyl carbamate, for example by Michael-type addition.
www.arkat-usa.org /home.aspx?VIEW=MANUSCRIPT&MSID=321   (1510 words)

 Water clusters: Untangling the mysteries of the liquid, one molecule at a time -- Keutsch and Saykally, ...
The water trimer has a chiral cyclic equilibrium structure with each water monomer acting as a single hydrogen bond donor and acceptor (75, 98).
The bifurcation tunneling motion (b) in the water trimer consists of the exchange of a free and a bound hydrogen together with the flipping motion of the free hydrogens on the two neighboring water monomers.
The chiral homodromic equilibrium structure of the water pentamer is analogous to that of the water trimer.
www.pnas.org /cgi/content/full/191266498v1   (6659 words)

 Structures of the two 3D domain-swapped RNase A trimers -- Liu et al. 11 (2): 371 -- Protein Science
The two trimers were heated at 55°C for 5 min, loaded onto a cation exchange Vydac S column, and eluted as described in Materials and Methods.
The major trimer (broken line) dissociates into the minor dimer, the major dimer, and the monomer, whereas the minor trimer (solid line) dissociates into the major dimer and the monomer.
Cross-linking of the major trimer (A) yields the cross-linked monomer, the intact monomer, and the cross-linked minor dimer, whereas cross-linking of the minor trimer (B) yields the cross-linked monomer and the intact monomer.
www.proteinscience.org /cgi/content/full/11/2/371   (5955 words)

 Jean Baum - Rutgers Chemistry and Chemical Biology Department
Using these peptides, we have characterized the conformational heterogeneity of various unfolded monomer forms, the conformation and dynamics of various trimer forms and long lived transient kinetic intermediate states.
We are pinpointing the stage in folding at which the defect is occurring by comparing NMR conformation, dynamics and folding of the unfolded, long-lived intermediate and trimer states of peptides with Gly-->X mutations along with real time folding experiments.
N labeled peptides are being designed to investigate the role of the local sequences surrounding the substitution site, the role of sequences N terminal to the substitution site and the role of the substituting residue.
rutchem.rutgers.edu /faculty/baum.html   (1093 words)

 Actin Cytoskeleton
Describe the steps involved in cell movement including: extension of the cell membrane, formation of focal adhesions, movement of the cell body and deadhesion.
Compare the "chemistry of the front and rear of a moving cell".
This is the slow, or lag phase of the polymerization process.
www.cytochemistry.net /Cell-biology/actin_filaments_intro.htm   (1450 words)

 Arnold M. Guloy   (Site not responding. Last check: )
The remarkable materials offer useful model systems for understanding the chemistry and physics of low-dimensional materials, particularly their electronic, optical and superconducting properties.
The underdeveloped chemistry of intermetallics and their unpredictable phase stabilities offers a serious challenge to solid state chemists.
Our work on intermetallics, using careful synthesis and characterization, and the application of viable theoretical models, is part of the overall attempt to understand the structure-property-chemical bonding relationships in solid materials.
www.chem.uh.edu /Faculty/Guloy   (496 words)

 Graduate Program: Department of Chemistry and Biochemistry, CU Boulder
The Seventeen Kilodalton Protein (Skp) is a trimeric periplasmic chaperone that assists outer membrane proteins in their folding and insertion into membranes.
The structure of the Skp trimer resembles a jellyfish with alpha-helical tentacles protruding from a beta barrel body defining a central cavity.
Department of Chemistry and Biochemistry · University of Colorado, Boulder
www.colorado.edu /biochemistry/grad_research.html   (1206 words)

 Best When Used By. . .. In the Pipeline:
Formaldehyde trimerizes into 1,3,5-trioxane, and acetaldehyde trimerizes into 2,4,6-trimethyl-1,3,5-trioxane (paracetaldehyde), as far as I know those are the two most common aldehyde trimers.
However, simple mixing of formaldehyde or its trimer with ammonium hydroxide followed by evaporation yields hexamethylenetetramine (hexamine, urotropin) which can be nitrated under very specific conditions (the details of which, dear reader, I shall not divulge) to produce the energetic materials known as RDX and HMX.
That reminds me of a chemistry prof's explanation of why he got into chemistry- he's sort of a hippie type, and he said, "In the 60s there were two reasons to get into chemistry- drugs and explosives.
pipeline.corante.com /archives/2006/06/07/best_when_used_by_.php   (2302 words)

 Dmitri G. Fedorov's homepage   (Site not responding. Last check: )
It is obtained with the FMO method for the quantum chemistry part and a set of the FMOcube utilities (included in the tools set supplied with GAMESS).
More precisely, this is the difference of the 2 and 1-body densities from a 2-body FMO-RHF calculation, plotted with the cutoff=0.0005 using Molekel (a free graphics software).
If you have become very keen on water trimers, here is another way of plotting this quantity.
staff.aist.go.jp /d.g.fedorov/wtrimer.html   (268 words)

 Metkinen Chemistry - reagents for DNA and RNA synthesis
Metkinen Chemistry - reagents for DNA and RNA synthesis
Metkinen Chemistry unveiled a biotransformation technology that has enabled for the first time the cost-effective commercial production of purine nucleoside analogues for use in the development of oligonluceotide therapeutics and for research applications...
They are building blocks for the synthesis of pharmaceutical oligonucleotide analogues and initial compounds for preparation of corresponding nucleoside 5'-di- and triphosphates.
www.metkinenchemistry.com   (528 words)

 The Protonation-Deprotonation Kinetics of the Protonated Schiff Base in Bicelle Bacteriorhodopsin Crystals -- Sanii et ...
In the native membrane, the bR molecules are arranged as hexagonal
The protein units are arranged as parallel trimers.
The presence of the trimer structure of the protein units
www.biophysj.org /cgi/content/full/89/1/444   (5035 words)

 Metkinen Chemistry
Metkinen Chemistry's biotransformation technology addresses the problems of traditional synthetic methods and offers alternative variants of biotransformation.
Metkinen Chemistry focuses on research and manufacture of reagents for RNA and DNA synthesis.
We have expert knowledge of nucleoside chemistry, reagents for oligonucleotide synthesis, phosphoramidites and various solid supports.
www.bioscreening.com /companies/metkinen_chemistry   (235 words)

 Department of Chemistry and Biochemistry Faculty
Molecular biology, protein chemistry, mass spectrometry and enzymological studies are used in combination to determine which amino acids are responsible for the fine substrate specificity of each enzyme, in binding substrates and mediating the reactions catalyzed by these proteins.
Development of the multi-dimensional NMR methodology for the resonance assignment and structural characterization of paramagnetic molecules to determine the scope and limits of multi-nuclear and multi-dimensional NMR spectroscopy for the structural analysis of paramagnetic molecules.
Intercalation chemistry of zeolites, adsorption of heavy metals by zeolites and iron oxides.
lewis.sfsu.edu /main.faculty.htm   (2233 words)

 Chemistry: electrical and wave energy patents new
Chemistry: electrical and wave energy patents - Monitor Patents
There are a variety ways to browse Chemistry: electrical and wave energy patent applications on our website including browsing by date, agent, inventor, and industry.
If you are interested in receiving occasional emails regarding Chemistry: electrical and wave energy patents we recommend signing up for free keyword monitoring by email.
www.freshpatents.com /Chemistry--electrical-and-wave-energy-dtnewntc204.php   (3352 words)

 UM Chemistry
By using a supersonic nozzle, weakly bound species (such as s water dimer or trimer) can be formed as a gas expands through a pinhole into a vacuum.
This technique makes it possible to study the structures, dipole moments, internal dynamics and interaction forces for a variety of dimers, trimers, and small clusters held together by very weak forces.
Complexes of water or methanol with a variety of partners have probed H-bonding interactions and solvent effects.Dimers and trimers involving greenhouse gases such as carbon dioxide or nitrous oxide have been a recent interest.
www.umich.edu /~michchem/faculty/kuczkowski   (437 words)

 Department of Chemistry and Biochemistry Faculty
Organic Synthesis, chemistry of singlet oxygen and organic peroxides, chemistry of fulvenes, small ring compounds, cycloadditions, heterocyclic chemistry.
Development of the multi-dimensional NMR methodology for the resonance assignment and structural characterization of paramagnetic molecules to determine the scope and limits of multi-nuclear and multi-dimensional NMR spectroscopy for the structural analysis of paramagnetic molecules.
Intercalation chemistry of zeolites, adsorption of heavy metals by zeolites and iron oxides.
www.chembiochem.sfsu.edu /main.faculty.htm   (2094 words)

 Chemistry Department | Brandeis University
Traditional chemistry curricula are responsible for creating the impression (in the budding inorganic or organic chemist) that "all real chemistry is done in solution." In many curricula, little more than a few lectures over four years are allocated to a discussion of the solid state.
On the other hand, the "traditional" solid-state chemist has preferred to remain aloof from organic or inorganic molecular crystals, which are generally low-melting, difficult to get pure, and are soft and readily distorted so that they tend to contain many defects and imperfections.
Further, solid-state reactions are of singular interest since many of them are highly selective, giving very pure products which may not be available from solution processes.
www.chem.brandeis.edu /foxman.html   (387 words)

 Mauritz - Sol Gel Research
This chemistry produces a variety of inorganic networks from silicon or metal alkoxide monomer precursors.
This suggests that the rate of dimerization is low, however, once dimers form, they react preferentially with monomers to form trimers, which in turn react with monomers to form tetrameters.
Cyclization occurs because of the proximity of the chain ends and the substantial depletion of the monomer population.
www.psrc.usm.edu /mauritz/solgel.html   (2637 words)

 Proteins - Tertiary Structure
The influenza virus haemaglutinin protein is another structure in which disulfide bonds stabilize a conformation wildly different than expected.
The molecule is a trimer of identical polypeptide chains, each of which has a globular "head" containing the host-receptor binding site and the antigenic determinants
The looped-out sections of chain contain the antigenic regions; amino acid mutations in these regions alter the antigenic character of the molecule, resulting in the recurring influenza epidemics with which we all are familiar.
chemistry.umeche.maine.edu /CHY431/Proteins11.html   (458 words)

 AllRefer.com - polymer (Chemistry) - Encyclopedia
You are here : AllRefer.com > Reference > Encyclopedia > Chemistry, General > polymer
The simple molecules that may become structural units are themselves called monomers; two monomers combine to form a dimer, and three monomers, a trimer.
A structural unit is a group having two or more bonding sites.
reference.allrefer.com /encyclopedia/P/polymer.html   (426 words)

 Nickel Chemistry
The Nickel (II) ion forms many stable complexes as predicted by the Irving Williams series.
Whilst there are no other important oxidation states to consider, the Ni(II) ion can exist in a wide variety of CN's which complicates its coordination chemistry.
The Department of Chemistry, University of the West Indies,
wwwchem.uwimona.edu.jm /courses/nickel.html   (1693 words)

 Cobalt Chemistry
Another important complex in the history of coordination chemistry is hexol.
This was the first complex that could be resolved into its optical isomers that did not contain carbon atoms.
A noticeable difference between chromium(III) and cobalt(III) chemistry is that cobalt complexes are much less susceptible to hydrolysis, though limited hydrolysis, leading to polynuclear cobaltammines with bridging OH- groups, is well known.
wwwchem.uwimona.edu.jm /courses/cobalt.html   (981 words)

 UGA Chemistry | Research | Faculty
The Center for Computational Quantum Chemistry seeks to develop theoretical and computational methods through mathematical models for describing and understanding the movement and function of electrons in molecules and to apply the theoretical methods to significant problems of broad chemical interest.
organosilicon chemistry, specifically the prediction and understanding of the properties of silicon analogs of both common and unknown hydrocarbon compounds;
the study of molecular ions and ion clusters pertinent to atmospheric chemistry.
www.chem.uga.edu /DoC/ResFacHFS.html   (247 words)

 Francesco Iachello: Yale Chemistry   (Site not responding. Last check: )
Although sophisticated mathematical methods are used, the research is aimed at the interpretation and understanding of experimental data, often obtained at the research laboratories of the Yale Chemistry Department.
Such is the case of the study of intensities of Franck-Condon transitions, studied in collaboration with the group of P.H. Vaccaro.
This research is also part of a wider interdisciplinary research that covers areas both in Physics and Chemistry.
www.chem.yale.edu /faculty/iachello.html   (669 words)

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