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Browsing Department of Chemistry by Title
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(Massachusetts Institute of Technology, 2008)Seven- and eight-membered carbocycles are key features in numerous naturally occurring organic substances, many of which are biologically important natural products. This thesis describes studies directed towards the ...
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(Massachusetts Institute of Technology, 2002)The intramolecular [4 + 2] cycloaddition reactions of c,-alkynyl carbonyl compounds are described. This reaction, the first heterocyclic variant of the enyne cycloaddition reaction, affords a product with a dihydroisobenzofuran ...
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(Massachusetts Institute of Technology, 1996)
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Intramolecular Heck couplings of unactivated alkyl electrophiles : synthetic and mechanistic studies (Massachusetts Institute of Technology, 2007)A method for the palladium-catalyzed intramolecular Heck coupling of unactivated alkyl bromides and chlorides is described. The optimal catalyst system was composed of Pd2(MeO-dba)3 as the metal source and N-heterocyclic ...
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Investigating asparagine-linked glycosylation substrate : specificity and effects on protein folding (Massachusetts Institute of Technology, 2009)N-linked glycosylation is a ubiquitous form of protein modification whereby a preassembled oligosaccharide is covalently attached the asparagine side chain of an acceptor protein. This process involves numerous enzymes, ...
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(Massachusetts Institute of Technology, 2006)N-linked protein glycosylation is characterized by the formation of a -glycosylamine linkage to an asparagine residue within the Asn-Xaa-Ser/Thr consensus sequence. This modification is found in organisms from eukaryotic, ...
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(Massachusetts Institute of Technology, 2010)The optical measurements described in this thesis reveal interactions among bound electron-hole pairs known as excitons in a semiconductor nanostructure. Excitons are quasiparticles that can form when light is absorbed by ...
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(Massachusetts Institute of Technology, 2006)The biosynthesis of asparagine-linked glycoproteins, highly conserved throughout all eukaryotes, requires a dolichylpyrophosphate-linked tetradecasaccharide precursor (Dol-PP-GlcNAc2Man9Glc3), from which the tetradecasaccharide ...
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(Massachusetts Institute of Technology, 2011)Asparagine-linked protein glycosylation entails the stepwise assembly of an oligosaccharide onto a polyisoprenyl diphosphate carrier, followed by the en bloc transfer of the glycan onto acceptor proteins by oligosaccharyl ...
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(Massachusetts Institute of Technology, 2012)Dynamic Nuclear Polarization (DNP) enhances signal to noise in NMR experiments, by transferring the large electron Boltzmann polarization to nuclear polarization, via application of pulsed or continuous-wave microwave ...
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Investigation of freezing properties of polar statospheric cloud particles with optical microscopy (Massachusetts Institute of Technology, 1997)
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(Massachusetts Institute of Technology, 2011)Hydrophobic polycations have been shown to completely kill bacterial, fungal, and viral pathogens, on-contact. Herein we describe advances with this technology on two fronts: (1) innovation of a polycationic-derivative ...
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(Massachusetts Institute of Technology, 2005)For a complete description of protein folding dynamics and the structure of the folded state, of unfolded and of non-native states of proteins and the kinetics of protein folding from the unfolded state to the folded state ...
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(Massachusetts Institute of Technology, 2008)Inside the cell, ribonucleotide reductases (RNRs) are responsible for the conversion of nucleotides to 2'-deoxynucleotides, an essential step in DNA biosynthesis and repair. The E. coli RNR is the best studied RNR to date ...
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(Massachusetts Institute of Technology, 2003)Oligosaccharyl transferase catalyzes the first commited step in N-linked glycosylation. The enzyme complex from Saccharomyces cerevisiae includes nine membrane bound proteins located in the lipid bilayer of the endoplasmic ...
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(Massachusetts Institute of Technology, 1957)
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Investigation of zinc metalloneurochemistry with fluorescent sensors based on fluorescein platforms (Massachusetts Institute of Technology, 2003)Chapter 1. CoordinationChemistry for the Neurosciences Metal ions are integral components of numerous enzymes and proteins. Although the field of bioinorganic chemistry has not focused on the brain and central nervous ...
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(Massachusetts Institute of Technology, 2013)Chapter 2 investigates the mechanism of the temperature-controlled polymerization of 3- methyl-3-phenylcyclopropene (MPCP) by Mo(NAr)(CHCMe 2Ph)(Pyr)(OTPP) (Ar = 2,6- diisopropylphenyl, Pyr = pyrrolide, OTPP = 2,3,5,6-te ...
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(Massachusetts Institute of Technology, 1980)
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(Massachusetts Institute of Technology, 2009)Ribonucleotide reductases (RNRs) catalyze the conversion of nucleotides to deoxynucleotides supplying the dNTPs required for DNA replication and DNA repair. Class I RNRs require two subunits ([alpha] and [beta]) for activity. ...
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