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  • Organic Chemistry  (8)
  • Binding Sites  (2)
  • Wiley-Blackwell  (8)
  • American Association for the Advancement of Science (AAAS)  (2)
  • American Association for the Advancement of Science
  • American Chemical Society
  • American Physical Society
  • American Physical Society (APS)
  • Institute of Physics
  • 2005-2009
  • 2000-2004
  • 1990-1994  (10)
  • 1980-1984
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  • 1935-1939
  • 1994  (5)
  • 1993  (5)
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  • Wiley-Blackwell  (8)
  • American Association for the Advancement of Science (AAAS)  (2)
  • American Association for the Advancement of Science
  • American Chemical Society
  • American Physical Society
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  • 2005-2009
  • 2000-2004
  • 1990-1994  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    (Z)-1,1-dichloro-2-(4-benzyloxyphenyl)-2,3-bis(4-methoxyphenyl)cyclopropane: The synthesis and enantiomeric separation of an antitumor agent (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 6 (1994), S. 41-45 
    Details
    ISSN: 0899-0042
    Keywords: chiral HPLC ; Chiralpak AD ; amylose carbamate stationary phase ; antiestrogen ; breast cancer ; dichlorotriarylcyclopropane ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (Z)-1,1-Dichloro-2-(4-benzyloxyphenyl)-2,3-bis(4-methoxyphenyl)cyclopropane (5), a potential antitumor agent designed to treat breast cancer, was prepared in three steps. A stereospecific palladium-catalyzed cross coupling reaction which provided the intermediate (Z)-triaryl alkene 4 was a crucial step in the synthesis. Makosza phase transfer reaction on 4 gave the enantiomeric (Z)-dichlorocyclopropane derivatives 5 which were resolved by semipreparative HPLC on a chiral stationary phase consisting of amylose tris-3,5-dimethylphenyl carbamate coated on silica gel. © 1994 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530060108
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  • 2
    Electronic Resource
    Electronic Resource
    Structure elucidation of a Pyoverdin Produced by Pseudomonas aeruginosa ATCC 27 853 (1993)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 83-87 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The primary structure of a pyoverdin (Pa TII) isolated from an iron deficient culture medium of Pseudomonas aeruginosa ATCC 27 853 has been elucidated by spectroscopic methods and degradation studies. Total assignment of 1H and 13C resonances as well as sequential information were achieved by two-dimensional NMR techniques: HOHAHA1, NOESY, HSQC and HMBC. The structure consists of the common pyoverdin chromophore 5-amino-2,3-dihydro-8,9-dihydroxy-1H-pyrimido [1,2-a]quinoline-1-carboxylic acid with succinic acid bound amidically to its amino group and the carboxyl group linked to the N-terminus of D-Ser-D(CHO) OHOrn-L-Orn-Gly-D-aThr-L-Ser-L-cOHOrn. According to the short-hand nomenclature suggested in [2, 3] the pyoverdin may be described as pyoverdin-Q-so′ OGtaSo′*-SUC.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19933350113
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  • 3
    Electronic Resource
    Electronic Resource
    Schwermetall- und chloridhaltige Filterstäube. I. Phasenanalysen und Modellversuche zum Recycling (1993)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 255-261 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Flue Dusts Containing Heavy Metal Ions and Chloride.I. Phase Analysis, Model Experiments for RecyclingFour flue dusts from a cement factory, an electric-furnace steelmaking plant and a municipal waste plant were analyzed by powder diffraction methods. Chloride combines above all with alkali ions or heavy metal ions, especially yielding PbCl2 and KPb2Cl5. The controlled sublimation of these chloride compounds in open crucibles was developed and optimized in our laboratory. Between 850°C and 1150°C and at reaction times from 30 min up to 12 h, the chloride content decreases to below 0.1 wt-%. The sublimed phase mainly consists of alkali and lead chloride. Zinc is found in the flue dust as oxide and is enriched during this process. Recent investigations with a small waelz kiln give analogous results. With our procedure, the manufacturer by himself is able to exploit flue dusts containing a large amount of heavy metal elements and chloride which cannot be deposited. The remaining product contains mainly zinc oxide which can be recycled in the zinc industry or returned to the production process. The sublimed chloride compounds may be recycled in the potash industry.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19933350307
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  • 4
    Electronic Resource
    Electronic Resource
    Epoxidierung von Kohlenstoff-Kohlenstoff-Doppelbindungen in Terpenen durch Linolsäurehydroperoxide (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 1253-1256 
    Details
    ISSN: 0170-2041
    Keywords: Terpenes ; Epoxides ; Linoleic acid derivatives ; Hydroperoxides ; Labeled compounds, 18O2 ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Epoxidation of Carbon-Carbon Double Bonds in Terpenes by Linoleic Acid HydroperoxidesEpoxidation of C=C double bonds in terpenes is achieved by reaction with linoleic acid hydroperoxides (LOOH) exemplified with caryophyllene (3), methyl farnesoate (5) and squalene (8). Linoleic acid (9S)-hydroperoxide was obtained by reaction of linoleic acid (1) with lipoxygenase present in tomato homogenisate. When 18O2-labeled (9S)-LOOH (2) was used 18O was found in the terpene epoxide. While 3 is converted under physiological conditions regioselectively in high yiled into its 4,5-epoxide 4, the yield of epoxidized products from long-chain molecules, e.g. squalene (8), decreases strongly and no regioselectivity was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1993199301204
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  • 5
    Electronic Resource
    Electronic Resource
    Structure Elucidation of the Gallium-Ornibactin Complex by 2D-NMR Spectroscopy (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 43-48 
    Details
    ISSN: 0170-2041
    Keywords: Ornibactin ; Siderophore ; Iron complex ; Gallium complex ; Pseudomonas strain TVV 69 ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From a Pseudomonas strain novel hydroxamate/carboxylate siderophores were isolated which were named ornibactins representing the modified tetrapeptide L-Orn1(Nδ-OH,Nδ-acyl)-D-threo-Asp(β-OH)-L-Ser-L-Orn4(Nδ-OH,N δ-formyl)-1,4-diaminobutane. The side-chain amino function of Orn1(Nδ-OH,Nδ-acyl) is acylated by 3-hydroxyoctanoic acid in the most lipophilic component of the microheterogeneous siderophore mixture. The structure elucidation was based on GC amino acid analysis, GC-MS and electrospray mass spectrometry of the iron complex. The 3-hydroxyoctanoic acid and the primary sequence were established on the basis of 1H and inverse detected 13C two-dimensional NMR spectra (COSY, TOCSY, NOESY, HMQC, HMBC) of the gallium-ornibactin-F complex which allowed the complete assignment of all 1H and 13C signals.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199319930108
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  • 6
    Electronic Resource
    Electronic Resource
    Synthese, Strukturaufklärung und Reaktionen trans-verknüpfter 3, 6-Anhydro-1, 2-O-isopropyliden-α-D-hexofuranosen (1994)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1994 (1994), S. 337-346 
    Details
    ISSN: 0170-2041
    Keywords: Carbohydrates ; Hexofuranoses ; 3, 6-Anhydro-D-hexofuranoses ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis, Structure Elucidation and Reactions of trans-Fused 3, 6-Anhydro-1, 2-O-isopropylidene-α-D-hexofuranosesUnexpectedly, the reaction of 1, 2-O-isopropylidene-5, 6-di-O-(p-tolylsulfonyl)-α-D-allofuranose (7) with KCN in ethanol yielded the first trans-fused 3,6-anhydro-hexofuranose 10. Besides by spectroscopic evidence the structure of 10 was proved by transformation to the tosylated acetal 13 which could also be obtained via an independent route. Further reactions of 10 all resulted in opening of the strained ring system yielding acetals (18-22). By blocking the 5-position with the alkali-resistant ether function this cyclization could also be achieved by more common reagents like NaH in DMF (32). - By applying this procedure to the corresponding α-D-galactofuranose derivative 41 3,6-anhydro-α-D-galactofuranose 42 could also be obtained albeit in low yield. For comparison purposes the 3,6-anhydro-α-D-gulo derivative 47 was synthesized from easily accessible 44.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199419940405
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  • 7
    Electronic Resource
    Electronic Resource
    Enoletherepoxide und ihre Reaktionsprodukte mit Nucleophilen (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 17-21 
    Details
    ISSN: 0170-2041
    Keywords: Enol ethers ; Dioxirane, dimethyl ; Epoxides ; Acetals ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enol Ether Epoxides and Products Resulting from Their Reaction with Nucleophiles1,2-Epoxydecyl pentyl ether (9a) was synthesized by treatment of 1-decenyl pentyl ether (5) with diemthyldioxirane (8). The enol ether epoxide 9a, characterized by its mass, 1H- and 13C-NMR spectra, reacts readily with hydride, O-, S- and N-nucleophiles. Similar reactions are expected to take place in the organism after biological oxidation of plasmalogens to their epoxides. This hypothesis is verified by detection of mixed acetals after tissue workup.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199319930105
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of doubly labeled enantiomerically pure (R)-mevalonolactone from lactic and malic acid (1994)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1994 (1994), S. 167-174 
    Details
    ISSN: 0170-2041
    Keywords: (R)-Mevalonolactone ; Isotopic labeling, 13C, 1H ; Chirality, self-reproduction of ; Lactic acid ; Malic acid ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enantiomerically pure 13C- and 1H-labeled (R)-mevalonolactones are prepared from (S)-malic and/or (S)-lactic acid by Seebachs methodology of self-reproduction of chirality. The two reaction pathways are complementary in the possibilities of multiple isotopic labeling. The labeling potential is exemplified by the synthesis of a doubly 13C, 1H-labeled, one 13C-, and one 1H-labeled mevalonolactone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199419940210
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  • 9
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    The structure of flavocytochrome c sulfide dehydrogenase from a purple phototrophic bacterium (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-10-21
    Description: The structure of the heterodimeric flavocytochrome c sulfide dehydrogenase from Chromatium vinosum was determined at a resolution of 2.53 angstroms. It contains a glutathione reductase-like flavin-binding subunit and a diheme cytochrome subunit. The diheme cytochrome folds as two domains, each resembling mitochondrial cytochrome c, and has an unusual interpropionic acid linkage joining the two heme groups in the interior of the subunit. The active site of the flavoprotein subunit contains a catalytically important disulfide bridge located above the pyrimidine portion of the flavin ring. A tryptophan, threonine, or tyrosine side chain may provide a partial conduit for electron transfer to one of the heme groups located 10 angstroms from the flavin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Z W -- Koh, M -- Van Driessche, G -- Van Beeumen, J J -- Bartsch, R G -- Meyer, T E -- Cusanovich, M A -- Mathews, F S -- GM-20530/GM/NIGMS NIH HHS/ -- GM-21277/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1994 Oct 21;266(5184):430-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7939681" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; Chromatium/*enzymology ; Computer Graphics ; Crystallography, X-Ray ; Cytochrome c Group/*chemistry ; Electron Transport ; Flavin-Adenine Dinucleotide/metabolism ; Hydrogen Bonding ; Models, Molecular ; Oxidoreductases/*chemistry ; Protein Conformation ; Protein Structure, Secondary
    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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  • 10
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    A protein phosphatase 2C involved in ABA signal transduction in Arabidopsis thaliana (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-06-03
    Description: The plant hormone abscisic acid (ABA) mediates various responses such as stomatal closure, the maintenance of seed dormancy, and the inhibition of plant growth. All three responses are affected in the ABA-insensitive mutant abi1 of Arabidopsis thaliana, suggesting that an early step in the signaling of ABA is controlled by the ABI1 locus. The ABI1 gene was cloned by chromosome walking, and a missense mutation was identified in the structural gene of the abi1 mutant. The ABI1 gene encodes a protein with high similarity to protein serine or threonine phosphatases of type 2C with the novel feature of a putative Ca2+ binding site. Thus, the control of the phosphorylation state of cell signaling components by the ABI1 product could mediate pleiotropic hormone responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Meyer, K -- Leube, M P -- Grill, E -- New York, N.Y. -- Science. 1994 Jun 3;264(5164):1452-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Plant Sciences, Swiss Federal Institute of Technology, Zurich.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8197457" target="_blank"〉PubMed〈/a〉
    Keywords: Abscisic Acid/*pharmacology ; Amino Acid Sequence ; Arabidopsis/enzymology/genetics/*metabolism ; *Arabidopsis Proteins ; Binding Sites ; Calcium/metabolism ; Chromosome Walking ; Cloning, Molecular ; Genes, Plant ; Genetic Markers ; Molecular Sequence Data ; Mutation ; Phosphoprotein Phosphatases/chemistry/genetics/*metabolism ; Plants, Genetically Modified ; *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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