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  • Mice  (10)
  • Organic Chemistry  (7)
  • 2010-2014  (10)
  • 2000-2004
  • 1980-1984  (6)
  • 1940-1944  (1)
  • 1930-1934
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis, Properties, and Crystal Structure of Silyl Nitronates (Silyl Esters of aci-Nitroalkanes): Towards the SN2 Reaction Path with Retention of Configuration at Silicon (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 697-710 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An efficient and flexible method for the preparation of silyl nitronates is described (see 1-10). NMR. spectral investigations indicate a rapid 1,3-silyl migration process, with an activation energy of about 10 kcal mol-1. X-ray crystallographic studies on the silyl nitronates 3 and 8 show structures that lean towards an SN2 retention pathway at silicon.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630320
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  • 2
    Electronic Resource
    Electronic Resource
    Erhöhung der Nachweisempfindlichkeit von Cyclosporin A durch Derivatisierung mit 2-Naphthylselenylchlorid (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 728-732 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enhancement of Detection Sensitivity of Cyclosporin A by Derivatization with 2-NapthylselenylchlorideThe UV./HPLC. detection sensitivity of cyclosporine A 1, an immunosuppressive cyclic undecapeptide containing one D-aminoacid and seven N-methylated aminoacids, is enhanced by a factor of 3-4 (limit of detection 5 ng) by conversion of the characteristic side chain of amino-acid-1 to the β-naphthylseleno-substituted tetrahydrofuran derivative 4.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630323
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  • 3
    Electronic Resource
    Electronic Resource
    Herstellung von 1, 3-Diketonen und von Nitro-diketonen durch (1:1)-Acylierungen von Lithiumenolaten mit Acylchloriden (1981)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 64 (1981), S. 716-735 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation of 1,3-Diketones and of Nitro-diketones by (1:1)-Acylation of Lithium Enolates with Acyl ChloridesSlow addition of precooled solutions of lithium enolates in THF (Fig. 1) to solutions of equimolar amounts of acyl chlorides in the same solvent at temperatures between - 80 and - 100° furnishes 1, 3-diketones in acceptable to good yields (Tables 1-3). Even 3-nitropropionyl and 4-nitrobutyryl chloride can be employed for the (1:1)-acylation of enolates to give the synthetically useful 5- and 6-nitro-1, 3-diketones 13 and 25, respectively. The scope and the limitations of this method of preparing 1, 3-diketones are given and are compared with alternative methods.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19810640313
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  • 4
    Electronic Resource
    Electronic Resource
    Improved Nitroaldol Reactions and Reductive Routes to Vicinal AminoalcoholsDedicated to Prof. Vladimir Prelog on the occasion of his 75th birthday (1981)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 64 (1981), S. 2264-2271 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Regioselective and flexible procedures are described for the preparation of a variety of protected vicinal nitroalcohols 1, 3 and 5 (see Scheme 5), as is an efficient method for their reduction to the corresponding vicinal aminoalcohols 2, 4 and 6.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19810640732
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  • 5
    Electronic Resource
    Electronic Resource
    Diastereoselective Synthesis of Nitroaldol DerivativesPart of the results described here was mentioned previously in a review article [1] and in a communication [2]. (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 1101-1133 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three methods are described by which diastereomerically enriched nitroaldols and their O-silylated derivatives can be prepared. threo-Nitroaldols prevail up to 10:1 over the erythro-isomers if doubly deprotonated nitroaldols 28 are quenched with acetic acid (THF/HMPT or DMPU, - 100°) (see Scheme 5 and Table 2). O-Trimethyl- or O-(t-butyl)dimethylsilylated (TBDMSi) erythro-nitroaldols can be obtained by protonation of the corresponding lithium nitronates (35, 39) in THF at low temperature (see Schemes 6 and 7). The erythro-O-TBDMSi-nitroaldol derivatives are also formed in the fluoride catalyzed addition of TBDMSi-nitronates (40-45) to aldehydes (see Schemes 8 and 9), In the latter reaction no 1,2-asymmetric induction is observed if a-branched silylnitronates or aldehydes are employed (see 48/49 and 50/51) - The stereochemical course of the reactions leading to erythro-O-TBDMSi-nitroaldols follows topological rules of broad applicability (see Scheme 10); possible mechnisms are discussed. - The configuration of diasteromerically 13C-NMR. Spectroscopy. - Some examples of the preparation of diastereimerically enriched 1,2-aminolcohols by reduction of the correspondence nitro compounds without loss of configurational purity are described (see Schemes 11 and 12).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650402
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  • 6
    Electronic Resource
    Electronic Resource
    Über eine Räumlich-energetische Ursache der Komplexbildung (1940)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 156 (1940), S. 227-240 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Als Überspannung oder Hypertension der Moleküle wird ein Zustand bezeichnet, bei dem die Moleküle aus den Elementen unter starker Kontraktion, aber relativ geringer Energieabgabe entstanden sind. Die Valenzelektronen befinden sich daher in einem mehr oder weniger hochangeregten Zustand und suchen durch Eingehen neuer, komplexchemischer Reaktionen in einen stabileren Zustand überzugehen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19401560706
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Verseifung aromatischer SulfochlorideHerrn Professor Dr. Dr. h. c. H. G. O. Becker zum 60. Geburtstag gewidmet (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 36-40 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies on the Hydrolysis of Aromatic SulfochloridesThe hydrolysis of aromatic sulfochlorides can bei described by a second-order law. Due to the strength of the base the constants of velocity are between 10-6 (H2O) or 103 (OH-) 1 mol -1 s-1 respectively. The reaction of benzensulfochlorides proceeds according to an addition-elimination mechanism, whereas benzylic sulfochlorides, reacting with a strong base, proceed to an elimination-addition mechanism.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250105
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  • 8
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    Intravascular danger signals guide neutrophils to sites of sterile inflammation (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-10-16
    Description: Neutrophils are recruited from the blood to sites of sterile inflammation, where they contribute to wound healing but may also cause tissue damage. By using spinning disk confocal intravital microscopy, we examined the kinetics and molecular mechanisms of neutrophil recruitment to sites of focal hepatic necrosis in vivo. Adenosine triphosphate released from necrotic cells activated the Nlrp3 inflammasome to generate an inflammatory microenvironment that alerted circulating neutrophils to adhere within liver sinusoids. Subsequently, generation of an intravascular chemokine gradient directed neutrophil migration through healthy tissue toward foci of damage. Lastly, formyl-peptide signals released from necrotic cells guided neutrophils through nonperfused sinusoids into the injury. Thus, dynamic in vivo imaging revealed a multistep hierarchy of directional cues that guide neutrophil localization to sites of sterile inflammation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McDonald, Braedon -- Pittman, Keir -- Menezes, Gustavo B -- Hirota, Simon A -- Slaba, Ingrid -- Waterhouse, Christopher C M -- Beck, Paul L -- Muruve, Daniel A -- Kubes, Paul -- Canadian Institutes of Health Research/Canada -- New York, N.Y. -- Science. 2010 Oct 15;330(6002):362-6. doi: 10.1126/science.1195491.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Immunology Research Group, University of Calgary, Alberta T2N 4N1, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20947763" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Animals ; Carrier Proteins/metabolism ; Cell Adhesion ; Chemokine CXCL2/metabolism ; Chemokines/metabolism ; Chemotaxis, Leukocyte ; Cues ; Endothelium, Vascular/physiology ; Inflammation/*immunology/metabolism/*pathology ; Kinetics ; Liver/blood supply/*immunology/metabolism/*pathology ; Liver Diseases/*immunology/metabolism/*pathology ; Macrophage-1 Antigen/physiology ; Mice ; Microscopy/methods ; Microscopy, Confocal ; Microvessels/physiology ; Necrosis ; *Neutrophil Infiltration ; Neutrophils/physiology ; Peptides/metabolism ; Receptors, Formyl Peptide/metabolism ; Receptors, Interleukin-8B/metabolism ; Receptors, Purinergic P2/metabolism ; Receptors, Purinergic P2X7 ; Signal Transduction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    The C-terminal domain of RNA polymerase II is modified by site-specific methylation (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-04-02
    Description: The carboxy-terminal domain (CTD) of RNA polymerase II (RNAPII) in mammals undergoes extensive posttranslational modification, which is essential for transcriptional initiation and elongation. Here, we show that the CTD of RNAPII is methylated at a single arginine (R1810) by the coactivator-associated arginine methyltransferase 1 (CARM1). Although methylation at R1810 is present on the hyperphosphorylated form of RNAPII in vivo, Ser2 or Ser5 phosphorylation inhibits CARM1 activity toward this site in vitro, suggesting that methylation occurs before transcription initiation. Mutation of R1810 results in the misexpression of a variety of small nuclear RNAs and small nucleolar RNAs, an effect that is also observed in Carm1(-/-) mouse embryo fibroblasts. These results demonstrate that CTD methylation facilitates the expression of select RNAs, perhaps serving to discriminate the RNAPII-associated machinery recruited to distinct gene types.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3773223/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3773223/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sims, Robert J 3rd -- Rojas, Luis Alejandro -- Beck, David -- Bonasio, Roberto -- Schuller, Roland -- Drury, William J 3rd -- Eick, Dirk -- Reinberg, Danny -- F32 GM071166/GM/NIGMS NIH HHS/ -- GM-37120/GM/NIGMS NIH HHS/ -- GM-71166/GM/NIGMS NIH HHS/ -- R01 GM037120/GM/NIGMS NIH HHS/ -- R37 GM037120/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2011 Apr 1;332(6025):99-103. doi: 10.1126/science.1202663.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute (HHMI), Department of Biochemistry, New York University School of Medicine, 522 First Avenue, Smilow 211, New York, NY 10016, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21454787" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arginine/metabolism ; Cell Line ; HeLa Cells ; Humans ; Methylation ; Mice ; Mutation ; Protein Interaction Domains and Motifs ; Protein Structure, Tertiary ; Protein-Arginine N-Methyltransferases/metabolism ; RNA Polymerase II/genetics/*metabolism ; RNA, Small Nuclear/metabolism ; RNA, Small Nucleolar/metabolism ; Recombinant Proteins
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    The structures of COPI-coated vesicles reveal alternate coatomer conformations and interactions (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-05-26
    Description: Transport between compartments of eukaryotic cells is mediated by coated vesicles. The archetypal protein coats COPI, COPII, and clathrin are conserved from yeast to human. Structural studies of COPII and clathrin coats assembled in vitro without membranes suggest that coat components assemble regular cages with the same set of interactions between components. Detailed three-dimensional structures of coated membrane vesicles have not been obtained. Here, we solved the structures of individual COPI-coated membrane vesicles by cryoelectron tomography and subtomogram averaging of in vitro reconstituted budding reactions. The coat protein complex, coatomer, was observed to adopt alternative conformations to change the number of other coatomers with which it interacts and to form vesicles with variable sizes and shapes. This represents a fundamentally different basis for vesicle coat assembly.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Faini, Marco -- Prinz, Simone -- Beck, Rainer -- Schorb, Martin -- Riches, James D -- Bacia, Kirsten -- Brugger, Britta -- Wieland, Felix T -- Briggs, John A G -- New York, N.Y. -- Science. 2012 Jun 15;336(6087):1451-4. doi: 10.1126/science.1221443. Epub 2012 May 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Structural and Computational Biology Unit, European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22628556" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; COP-Coated Vesicles/*chemistry/*ultrastructure ; Coat Protein Complex I/*chemistry ; Coatomer Protein/*chemistry ; Cryoelectron Microscopy ; Electron Microscope Tomography ; Image Processing, Computer-Assisted ; Mice ; Models, Molecular ; Protein Conformation
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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