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  • Artikel  (52)
  • Springer  (52)
  • 1985-1989  (48)
  • 1955-1959  (2)
  • 1940-1944  (2)
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  • Artikel  (52)
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  • 1
    Digitale Medien
    Digitale Medien
    Complexation with diol host compounds. Part 2. Structures of 1,1,2,2-tetraphenylethane-1,2-diol and its 1∶2 molecular inclusion complex with dimethylsulphoxide (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 809-822 
    Details
    ISSN: 1572-8854
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The structures of 1,1,2,2-tetraphenylethane-1,2-diol and its 1∶2 molecular inclusion complex with dmso have been elucidated by X-ray crystallography from single crystal diffraction data. Crystals of the host, compound I, are monoclinic, space groupP21/n, witha=17.669(6) Å,b=6.144(6) Å,c=17.873(6) Å,β=92.67(3)°,z=4. Crystals of the clathrate, compound II, are triclinic,P¯1, witha=9.138(5) Å,b=18.384(6) Å,c=18.496(3) Å,α=61.16(2)°,β=83.22(3)°, γ=88.06(3)°,Z=4. Both structures were solved by direct methods and refined to finalR values of 0.072 and 0.107, respectively. Compound I is partially disordered and its packing is governed by strong intermolecular hydrogen bonds. Compound II is characterized by crossing channels which accommodate the guest dmso molecules. The thermal properties of the latter compound have been characterized by DTA and TGA thermograms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01185348
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  • 2
    Digitale Medien
    Digitale Medien
    Complexation with diol host compounds. Part 3. Molecular inclusion of 4-methylcyclohexanone and 2-methylcyclohexanone by the host,trans-9,10-dihydroxy-9,10-diphenyl-9,10-dihydroanthracene (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 847-859 
    Details
    ISSN: 1572-8854
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The structures of the 1∶2 molecular complexes oftrans-9,10-dihydroxy-9,10-diphenyl-9,10-dihydroanthracene with 4-methylcyclohexanone (1) and with 2-methylcyclohexanone (2) have been determined by X-ray crystallography. The crystal data are as follows: Compound (1):P22/c,a=8.838(2) Å,b=8.92(1) Å,c=20.879(8)=Å,β=98.67(2)°,V=1627(2) Å3,Z=2 andR=0.062 for 2201 unique MoKα reflections; Compound (2):P¯1,a=8.917(3) Å,b=9.900(2) Å,c=11.250(4) Å,a=68.72(2)°,β=64.39(3)°, γ=74.86(2)°,V=828.1(5) Å3,Z=1 andR=0.098 for 2563 unique reflections. Both inclusion compounds exhibit O-H⋯O=C hydrogen bonding interactions. The thermal properties of these compounds have been characterized by DTA and TGA thermograms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01185351
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  • 3
    Digitale Medien
    Digitale Medien
    Sustained hysteresis in a catalysed reaction: Hydrogenolysis of alkanes on Re/Al2O3 catalysts (1989)
    Springer
    Catalysis letters 2 (1989), S. 257-261 
    Details
    ISSN: 1572-879X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Alkane hydrogenolysis on Re/Al2O3 catalysts has been studied by a thermal cycling procedure. Because deactivation occurs during heating and is then reversed at higher temperatures, rates are much faster during cooling than during heating. Rates during subsequent thermal cycles are reproducible. Re is 104 times more active than Pt for hydrogenolysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00770222
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  • 4
    Digitale Medien
    Digitale Medien
    A transformation of the two-body problem (1985)
    Springer
    Celestial mechanics and dynamical astronomy 35 (1985), S. 1-7 
    Details
    ISSN: 1572-9478
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A transformation of the differential equations of motion of the two-body problem in the spherical coordinates to oscillator form is derived. It is shown that the independent variable transformation dt/ds=r2 is a transformation which makes the oscillator form possible.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01229108
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  • 5
    Digitale Medien
    Digitale Medien
    Measurement of energy and charged particle emission in the central rapidity region from O+A andp+A collisions at 14.5 GeV/c per nucleon and preliminary results from Si+A collisions (1988)
    Springer
    The European physical journal 38 (1988), S. 35-43 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The first data from a16O beam of total energy 232 GeV at the BNL Tandem-AGS are discussed. Preliminary results from a28Si beam of total energy 406 GeV are also shown. The full complement of E802, including a magnetic spectrometer, was used for the28Si measurement. A different experimental arrangement was used for16O. Comparison measurements with proton beams are presented for both configurations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01574512
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  • 6
    Digitale Medien
    Digitale Medien
    Calcium and sodium distribution and movements in smooth muscle (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 981-988 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Ca, Mg, Na ; electron probe analysis ; mitochondria ; sarcoplasmic reticulum ; inositol trisphosphate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Electron probe microanalysis (EPMA) has been used to study the subcellular distribution of Ca, Na, K. Cl, and Mg in smooth muscle. The EPMA results indicate that the sarcoplasmic reticulum (SR) is the majorintracellular source and sink of activator Ca: norepinephrine decreases the Ca content of the junctional SR in portal vein smooth muscle. Mitochondria do not play a significant role in regulating cytoplasmic free Ca2+, but mitochondrial Ca content can be altered to a degree compatible with suggestions that fluctuations in matrix Ca contribute to the control of mitochondrial metabolism. The rise intotal cytoplasmic Ca during a maintained, maximal contraction is very much greater than the rise in free Ca2+, and is probably in excess of the known binding sites available on calmodulin and myosin. Cell Ca is not increased in normal cells that are Na-loaded. The non-Donnan distribution of Cl is not due to compartmentalization, but reflects high cytoplasmic Cl. Na-loading of smooth muscle in K-free solutions is temperature dependent, and may exhibit cellular heterogeneity undetected by conventional techniques. The total cell Mg is equivalent to approximately 12 mM, and less than 50% of it can be accounted for by binding to ATP and to actin. Mitochondrial monovalent cations in smooth muscle are relatively rapidly exchangeable.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01952118
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  • 7
    Digitale Medien
    Digitale Medien
    The effect of carbonaceous deposits on product selectivity in alkane hydrogenolysis (1989)
    Springer
    Catalysis letters 3 (1989), S. 359-363 
    Details
    ISSN: 1572-879X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The hydrogenolysis of propane and of n-butane on Pt/Al2O3 and Pt-Re/Al2O3 catalysts has been studied using a stepwise temperature programme which reveals clearly the effects of carbonaceous deposits on both rate and product selectivities. On Pt/Al2O3 catalysts, deposits formed during the reaction of n-butane suppress C2H6 formation and enhance C3H8 formation, due solely to a decrease in the probability of central C-C bond fission. On Pt-Re/Al2O3, such deposits have little or no effect on product selectivities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00771263
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  • 8
    Digitale Medien
    Digitale Medien
    Atmosphere-ocean interaction in mid-latitude storms (1988)
    Springer
    Meteorology and atmospheric physics 38 (1988), S. 50-63 
    Details
    ISSN: 1436-5065
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geographie , Physik
    Notizen: Summary Surface fluxes of heat, latent heat, and momentum, and entrainment fluxes and vertical motion at the top of the boundary layer have been calculated for limited regions of several mid-latitude ocean storms. Results have been combined to describe distributions of boundary layer processes which are characteristic of such storms. Surface heat fluxes have important effects in the region west of cold or occluded fronts and are relatively unimportant within a band of about 200 km width east of fronts. Entrainment in pre-frontal regions is driven largely by vertical shear at the top of the boundary layer, while in post-frontal regions it is driven largely by surface heat flux. Boundary layers are well defined in regions more than roughly 200 km east or west of fronts; but closer to fronts boundary layers are not well defined due to the combined effects of entrainment, condensation, and vertical motion associated with the distribution of surface stress.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01029947
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  • 9
    Digitale Medien
    Digitale Medien
    Construction and expression of synthetic DNA fragments coding for polypeptides with elevated levels of essential amino acids (1985)
    Springer
    Applied microbiology and biotechnology 21 (1985), S. 200-205 
    Details
    ISSN: 1432-0614
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Summary Polypeptides, with elevated levels of essential amino acids, could be useful as partial protein supplements to food and feeds. To obtain DNA fragments coding for these polymers, oligonucleotides were constructed by random synthesis of a mixture of appropriate codon pairs and inserted into a bacterial plasmid in E. coli. Two of the isolated fragments were subjected to DNA sequence analysis and theoretically code for polypeptides containing up to 23% lysine, 12% tryptophan, 12% methionine, 6% isoleucine, and 6% threonine. These five amino acids make up 60% of the total amino acid content of the peptide, compared with 25% for the same amino acids in α lactalbumin, a milk protein considered to be high in essential amino acids. These fragments, when fused to an active bacterial promoter, which directs the synthesis of chloramphenicol acetyl transferase (CAT), cause bacteria, harboring these modified genes, to take up more lysine as compared to control cells and produce commensurately larger CAT polypeptides. This method of gene synthesis may permit production of polypeptides with a specified amino acid composition to supplement specific diets low in the essential amino acids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00295122
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  • 10
    Digitale Medien
    Digitale Medien
    The influence of hypertension upon the normal cardiovascular responses to hemorrhagic hypotension and shock (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 607-609 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Hypertension ; hypotension ; vascular compensation ; vascular decompensation ; hemorrhage ; shock
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The data suggest that rats genetically inbred to be hypertensive (SHR) are less able to compensate for hemorrhage and shock than their normotensive controls (WKY). Two reasons for this genetic dysfunction are: 1) SHRs seem to depend more on innervated alpha 1 than noninnervated alpha 2 adrenoreceptors for vasoconstriction; and 2) the vascular smooth muscle hypertrophy noted in SHRs may interfere with effective vasoconstriction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02007680
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