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  • 1990-1994  (19)
  • 1965-1969  (6)
  • 1990  (19)
  • 1965  (6)
  • Inorganic Chemistry  (15)
  • Polymer and Materials Science  (6)
  • Chlorophyta  (2)
  • Lepus americanus  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of high light on the efficiency of photochemical energy conversion in a variety of lichen species with green and blue-green phycobionts (1990)
    Springer
    Planta 180 (1990), S. 400-409 
    Details
    ISSN: 1432-2048
    Keywords: Chlorophyll fluorescence ; Chlorophyta ; Cyanobacteria ; Desiccation ; Lichens ; Light stress ; Photoinhibition in phycobionts ; Phycobiont
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Exposure to high light induced a quantitatively similar decrease in the rate of photosynthesis at limiting photon flux density (PFD) and of photosystem II (PSII) photochemical efficiency, FV/FM, in both green and blue-green algal lichens which were fully hydrated. Such depressions in the efficiency of photochemical energy conversion were generally reversible in green algal lichens but rather sustained in blue-green algal lichens. This greater susceptibility of blue-green algal lichens to sustained photoinhibition was not related to differences in the capacity to utilize light in photosynthesis, since the light-and CO2-saturated rates of photosynthetic O2 evolution were similar in the two groups. These reductions of PSII photochemical efficiency were, however, largely prevented in lichen thalli which were fully desiccated prior to exposure to high PFD. Thalli of green algal lichens which were allowed to desiccate during the exposure to high light exhibited similar recovery kinetics to those which were kept fully hydrated, whereas bluegreen algal lichens which became desiccated during a similar exposure exhibited greatly accelerated recovery compared to those which were kept fully hydrated. Thus, green algal lichens were able to recover from exposure to excessive PFDs when thalli were in either the hydrated or desiccated state during such an exposure, whereas in blue-green algal lichens the decrease in photochemical efficiency was reversible in thalli illuminated in the desiccated state but rather sustained subsequent to illumination of thalli in the hydrated state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198792
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Germacrone defends labrador tea from browsing by snowshoe hares (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 1961-1970 
    Details
    ISSN: 1573-1561
    Keywords: Labrador tea ; Ledum groenlandicum ; snowshoe hare ; Lepus americanus ; herbivore ; plant chemical defense ; germacrone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Labrador tea (Ledum groenlandicum), a slow-growing late successional evergreen, is highly unpalatable to snowshoe hares (Lepus americanus). Germacrone, a sesquiterpene that is the major component of the essential oil ofL. groenlandicum, was shown by bioassay to be a potent antifeedant to hares. Its concentrations in leaves and intemodes of the plant are high enough to defendL. groenlandicum from hares. This chemical defense of Labrador tea from herbivory is consistent with the resource availability theory of antiherbivore defense.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020508
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Winter chemical defense of Alaskan balsam poplar against snowshoe hares (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 1941-1959 
    Details
    ISSN: 1573-1561
    Keywords: Balsam poplar ; Populus balsamifera ; snowshoe hare ; Lepus americanus ; plant chemical defense ; herbivore ; cineol ; benzyl alcohol ; bisabolol ; 6-hydroxycyclohexenone ; salicaldehyde
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Palatabilities of parts and growth stages of balsam poplar (Populus balsamifera) to snowshoe hares (Lepus americanus) are related to concentrations of specific plant metabolites that act as antifeedants. Buds are defended from hares by cineol, benzyl alcohol, and (+)-α-bisabolol. Internodes are defended by 6-hydroxycylohexenone (6-HCH) and salicaldehyde. Although defense of interaodes depends upon both compounds, the defense of juvenile internodes is principally related to salicaldehyde concentration; the defense of internode current annual growth is principally related to 6-HCH concentration. The concentration of 6-HCH can be supplemented by the hydrolysis of phenol glycosides when plant tissue is disrupted, raising the possibility of a dynamic element of the chemical defense of poplar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020507
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of high light on the efficiency of photochemical energy conversion in a variety of lichen species with green and blue-green phycobionts (1990)
    Springer
    Planta 180 (1990), S. 400-409 
    Details
    ISSN: 1432-2048
    Keywords: Chlorophyll fluorescence ; Chlorophyta ; Cyanobacteria ; Desiccation ; Lichens ; Light stress ; Photoinhibition in phycobionts ; Phycobiont
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Exposure to high light induced a quantitatively similar decrease in the rate of photosynthesis at limiting photon flux density (PFD) and of photosystem II (PSII) photochemical efficiency, FV/FM, in both green and blue-green algal lichens which were fully hydrated. Such depressions in the efficiency of photochemical energy conversion were generally reversible in green algal lichens but rather sustained in blue-green algal lichens. This greater susceptibility of blue-green algal lichens to sustained photoinhibition was not related to differences in the capacity to utilize light in photosynthesis, since the light-and CO2-saturated rates of photosynthetic O2 evolution were similar in the two groups. These reductions of PSII photochemical efficiency were, however, largely prevented in lichen thalli which were fully desiccated prior to exposure to high PFD. Thalli of green algal lichens which were allowed to desiccate during the exposure to high light exhibited similar recovery kinetics to those which were kept fully hydrated, whereas bluegreen algal lichens which became desiccated during a similar exposure exhibited greatly accelerated recovery compared to those which were kept fully hydrated. Thus, green algal lichens were able to recover from exposure to excessive PFDs when thalli were in either the hydrated or desiccated state during such an exposure, whereas in blue-green algal lichens the decrease in photochemical efficiency was reversible in thalli illuminated in the desiccated state but rather sustained subsequent to illumination of thalli in the hydrated state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160396
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Thermodynamic cycle-perturbation study of the binding of trifluoroacetyl dipeptide anilide inhibitors with porcine pancreatic elastase (1990)
    New York : Wiley-Blackwell
    Biopolymers 30 (1990), S. 773-780 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The variety of results of crystallographic studies of the serine proteases complexed with isocoumnrin inhibitors presents a challenging problem to modeling methods and molecular energetics. Therefore, the thermodynamic cycle-perturbation technique has been used to study a model system of elastase and two peptidic inhibitors. Using the program AMBER, the technique correctly predicts changes of the binding constants for the trifluoroacetyl dipeptide inhibitors in comparison with available experimental (kinetic and crystallographic) data. However, the absolute values obtained are shown to be sensitive to the specific electrostatic interaction potential parameters used in the simulations. The reader and user are cautioned that thermodynamic cyle-perturbation results may be too optimistic by underestimating the accuracy of free energy values. This is especially a matter of concern for those cases where a direct comparison with experimental values is not possible, viz., (1) the simulation of binding of novel compounds, (2) structurally uncertain binding sites, or (3) structurally different binding modes. With our best 4-31G* ESP (electrostatic potential) charges we were able to reproduce experimentally determined free energy differences (ΔΔA) with an accuracy of about 1.5 kcal/mol. Dynamically induced structural changes in the binding site of elastase, and particularly changes in hydrogen-bond patterns of the binding site, are also reported.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360300712
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  • 6
    Electronic Resource
    Electronic Resource
    Diaminozucker, VI. Die Synthese der 2.6-Diamino-2.6-didesoxy-β-D-mannose. Ein Derivat der 2.6-Imino-2.6-didesoxy-α-D-altrose (1965)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 98 (1965), S. 93-97 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Inversion des C-3 im Molekül des D-Altrosamins unter Nachbargruppenbeteiligung führte zum Oxazolin III und zum Aziridin IV. Durch Einführung einer Aminogruppe in III und Ringöffnung wurde das 2.6-Diamino-2.6-didesoxy-β-D-mannose-dihydrochlorid kristallisiert erhalten.  -  Umsetzung des Tosylamins XII mit Natriumacetat ergab Ringschluß zu einem Derivat der 2.6-Imino-2.6-didesoxy-α-D-altrose (XIII).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19650980110
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  • 7
    Electronic Resource
    Electronic Resource
    Schwefel-Stickstoff-Fluorverbindungen, XIV: Notiz über Darstellung und Eigenschaften von NSF2N(C2H5)2 (1965)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 98 (1965), S. 2049-2050 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19650980643
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  • 8
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Silyl-Komplexe, 34 Ein zweikerniger Gold-Silyl-Komplex mit Gold-Gold-Wechselwirkung zwischen einer (R3P)2Au- und einer (R′3Si)ClAu-Einheit (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 791-793 
    Details
    ISSN: 0009-2940
    Keywords: Gold complex, dinuclear / Silyl complex / Gold - gold interaction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition-Metal Silyl Complexes, 34. - A Dinuclear Gold Silyl Complex with Gold- Gold Interaction Between an (R3P)2Au and an (R′3,Si)ClAu UnitPh2MeP-Au-Cl reacts with Ph2MeP-Au-SiPh3 to form the dinuclear complex (Ph2MeP)2Au2(Cl)SiPh3, which is in equilibrium with its starting compounds. An X-ray structure analysis reveals that it consists of a (Ph2MeP)2Au and a (Ph3Si)ClAu unit, which are held together by Au-Au interaction [298.07(4) Pm]. The approximately linear AuL2 units are orthogonal to each other.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230423
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  • 9
    Electronic Resource
    Electronic Resource
    Synthese und Reaktionen von Hydrido(oxim)-, Hydrido(oximato)- und Alkenyl(oximato)-Komplexen des Rutheniums und Osmiums (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 697-702 
    Details
    ISSN: 0009-2940
    Keywords: Osmium complexes/Oximato ligands, bidentate/Ruthenium complexes/Ring opening, ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Reactions of Hydrido(oxime), Hydrido(oximato) and Alkenyl(oximato) Complexes of Ruthenium and OsmiumThe carbonyl(hydrido) complexes MHCl(CO)[PMe(tBu)2]2 (4: M = Ru; 5: M = Os) react with aldoximes and ketoximes to give the octahedral hydrido(oxime)ruthenium and -osmium compounds MHCl(CO)[N(OH)=CRR′](PMe(tBu)2]2 (8-13) in high yields. Using MHCl(CO)(PiPr3)2 (6, 7) as starting materials, the complexes MHCl(CO)[N(OH)=CRR′](PiPr3)2 (14-16) are obtained. Reactions of 9 (M = Os; R = R′ = CH3) illustrate that the oxime ligand in the hydrido(oxime) compounds is easily displaced by Lewis bases. Either from 4, 5 and Na[N(O) = CRR′] in methanol or from 8-13 and NaH in THF the hydrido(oximato) complexes 20-25 in which the oximato ligand is coordinated via N and O, are formed almost quantitatively. CO opens the three-membered ring by cleavage of the M-N bond. Analogously, the alkenyl(oximato) compounds 28-30 are obtained from M[(E)-CH = CHPh]Cl(CO)[PMe(tBu)2)2]2 (18: M = Os; 27: M = Ru) with Na[N(O) = CRR′].
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230408
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamic properties of the first enzymatic reaction steps of porcine pancreatic elastase. How rigid is the active site of the native enzyme? Molecular dynamics simulation (1990)
    New York : Wiley-Blackwell
    Biopolymers 30 (1990), S. 781-796 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two molecular dynamics simulations (100 and 50 ps) of native porcine pancreatic elastase i.e., without bound substrate and with the active site hydrated by a dome of water (630 molecules) have been performed. Dynamical properties of the catalytic tetrad have been examined. While relative conformations of the Asp 102, His 57, and Ser 214 are rather stable in time, the side chain of Ser 195 undergoes several conformational changes. No preferences are observed for the formation of a hydrogen bond between the Oγ—H group (Ser 195) and nitrogen N∊ (His 57). A cluster of ordered water molecules effectively competes with the H—Oγ group (Ser 195) and thereby prevents the formation of this H bond, which is generally agreed to be crucial for catalysis.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360300713
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