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  • 1
    Electronic Resource
    Electronic Resource
    NMR chemical shifts of xenon in mixed aprotic solvents: A probe of liquid structure (1986)
    Springer
    Journal of solution chemistry 15 (1986), S. 777-790 
    Details
    ISSN: 1572-8927
    Keywords: NMR ; chemical shifts ; mixed solvents ; xenon ; acetone ; alkanes ; carbon tetrachloride ; N,N-dimethylformamide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The chemical shift of elemental xenon is extremely sensitive to the environment. In aprotic solvents, the presence of xenon has little effect on the solvent structure, and preferential solvation is not observed in any mixed solvent system. Consequently, xenon shifts can reveal the presence of short range order in certain liquids. Chemical shift data are presented for several model systems, including mixtures of different alkanes, alkanes with benzene, alkanes with acetone, and carbon tetrachloride with dimethylformamide (DMF). In certain cases, the xenon shift is strongly non-linear with composition. This effect arises from a specific interaction between the two solvents in the CCl4-DMF system, while it reflects short range liquid order in the acetone-alkane systems. This effect is also apparent in the deviation of the densities of the acetone-alkane mixtures from ideality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646718
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  • 2
    Electronic Resource
    Electronic Resource
    A new proof of finite moment conditions for GI/G/1 busy periods (1989)
    Springer
    Queueing systems 4 (1989), S. 171-178 
    Details
    ISSN: 1572-9443
    Keywords: Random walk ; ladder epoch ; virtual delay ; FIFO ; work
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A generalization of the GI/G/1 queue is considered where the service time of the nth customer and the inter-arrival time between arrivalsn andn+1 may be dependent random variables. New proofs are obtained of finite moment conditions for busy periods and the ladder epochs of a corresponding random walk. The method of proof, which is much different from the usual ones, directly relates busy period moments to virtual and actual delay moments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01158551
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  • 3
    Electronic Resource
    Electronic Resource
    Paramural bodies of Albugo candida (1976)
    Springer
    Archives of microbiology 109 (1976), S. 271-275 
    Details
    ISSN: 1432-072X
    Keywords: Paramural bodies ; Plasmalemmasomes ; Wall formation ; Albugo candida
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The paramural bodies of Albugo candida were formed solely by elaboration of the plasmalemma. Two major forms were recognized: one consisting of plasmalemmal invaginations projecting into the cytoplasm; the other appearing like a pocket containing a number of vesicles and tubules. It is suggested that the first is the basic form of paramural body. In sporangia the paramural bodies break away from the plasmalemma and undergo autodigestion while in vegetative hyphae their tubules and lamellae break up into vesicles that are finally sequestered into the wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446638
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  • 4
    Electronic Resource
    Electronic Resource
    Ternary complexes of copper(II) involving diethylenetriamine and their role in the promotion of hydrolysis of α-amino acid esters (1988)
    Springer
    Transition metal chemistry 13 (1988), S. 379-383 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Ternary complexes of copper(II) with diethylenetriamine (dien), together with monodentate ligands, including α-amino acid esters, were studied using potentiometric and conductometric techniques. The formation constants of the resulting binary and ternary complexes were determined. The kinetics of the base hydrolysis of the above esters in the presence of copper(II)-dien complex were studied at 30°C. The rate and catalysis constants were estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01225132
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  • 5
    Electronic Resource
    Electronic Resource
    Equilibrium and hydrolysis ofα-amino acid esters in ternary complexes of copper(II) involving glycyl-L-tyrosine (1989)
    Springer
    Transition metal chemistry 14 (1989), S. 347-350 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Binary and ternary complexes of copper(II) with glycyl-L-tyrosine and an amino acid ester were investigated by potentiometric and spectrophotometric techniques. The kinetics of base hydrolysis of the above esters in the presence of copper(II)-glycyl-L-tyrosine complex was studied at 30°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01032507
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  • 6
    Electronic Resource
    Electronic Resource
    Hydrolysis ofα-amino acid esters in ternary complexes of copper(II) involving glycyl-DL-valine (1988)
    Springer
    Transition metal chemistry 13 (1988), S. 146-149 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Ternary complexes of copper(II) containing glycyl-DL-valine and amino acid esters were investigated by the potentiometric technique. The kinetics of base hydrolysis of the above esters in the presence of copper(II)-glycyl-DL-valine complex were studied at 30°C. The rate and catalysis constants were estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01087808
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  • 7
    Electronic Resource
    Electronic Resource
    A relaxing factor released by phospholipase A2 in the absence of endothelium (1987)
    Springer
    Molecular and cellular biochemistry 78 (1987), S. 81-88 
    Details
    ISSN: 1573-4919
    Keywords: vascular relaxation ; Phospholipase A2 ; relaxing factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Phospholipase A2 (PLA2) produced slow dose dependent relaxation in intact and endothelium-deprived precontracted rabbit aortic strips. In endothelium-deprived preparations, relaxation induced by PLA2 is inhibited by hemoglobin, methylene blue and parabromophenacylbromide (PBPB), and is potentiated by superoxide dismutase (SOD). Indomethacin has no effect. Relaxation is accompanied by a rise in c-GMP. Phospholipase C causes a significant increase in tension, while Phospholipase D has no effects. In intact aortic strips PLA2 causes a biphasic response with no elevation in c-GMP. The results indicate several common features of the PLA2 released factor with endothelium-derived relaxing factor (EDRF). However PLA2 induced relaxation is not dependent on endothelial cells. Apparently in addition to nitric oxide which may be the endothelium-derived relaxing factor, a second smooth muscle relaxing factor exists which is initiated by PLA2 and is independent of endothelium. The production of the PLA2 produced relaxation is dependent on its specific hydrolytic activity. We call this relaxing factor the phospholipid-derived relaxing factor (PDRF).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224427
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  • 8
    Electronic Resource
    Electronic Resource
    Enlarged map ofAgrobacterium tumefaciens C58 and the location of chromosomal regions which affect tumorigenicity (1986)
    Springer
    Molecular genetics and genomics 205 (1986), S. 153-159 
    Details
    ISSN: 1617-4623
    Keywords: Chromosomal map ; Agrobacterium tumefaciens ; Non-tumorigenic mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A revised and enlarged genetic map of theAgrobacterium tumefaciens C58 chromosome has been produced with the help of plasmid R68.45. Apart from the location of several auxotrophic markers, the map also shows the position of two independent genes,ctu1 andctu2, which, when mutated, block the tumorigenesis of the bacterium. Of these two, onlyctu1 is complemented by the C58 chromosomalvir region cloned by Douglas et al. (1985). The same mutant was complemented by a chromosomal gene or genes located nearleu ofRhizobium meliloti and known to affect the nodulation properties of that bacterium. It has also been observed that C58 tryptophan auxotrophs invariably lose tumorigenicity. Prototrophic revertants and mutants supplied with extra tryptophan for about two weeks after infection produce normal tumours. These investigations suggest that for successful tumorigenesis a continuous supply of tryptophan is needed (to be converted into auxin IAA?) at least during the early stages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02428045
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  • 9
    Electronic Resource
    Electronic Resource
    The role of lysolecithin in the relaxation of vascular smooth muscle (1987)
    Springer
    Bioscience reports 7 (1987), S. 783-789 
    Details
    ISSN: 1573-4935
    Keywords: endothelium ; vascular relaxation ; lysolecithin ; phospholipids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The effect of lysolecithin (lysophosphatidylcholine) on the relaxation of rabbit aortic strip closely resembled that produced by acetylcholine (ACh) which releases the endothelium-derived relaxing factor (EDRF). Relaxation induced by lysolecithin depended on the presence of endothelium and was inhibited by hemoglobin and methylene blue. It appeared to be mediated by the second messenger, c-GMP. Lysolecithin induced relaxation was slower but more persistent than that resulting from the endothelium-derived relaxing factor (EDRF) produced by acetylcholine (ACh). Like lysolecithin, Triton X-100, a non-ionic detergent, also preferentially relaxed aortic strips with intact endothelium. The results demonstrate the importance of phospholipids derived from cell membranes in vascular smooth muscle relaxation. Endothelium-derived relaxing factors appear as a group of heterogeneous substances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01116751
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  • 10
    Electronic Resource
    Electronic Resource
    Response of corn to micronutrients (Zn and Cu) on a saline soil. I. Growth and ionic relationships (1977)
    Springer
    Plant and soil 48 (1977), S. 719-724 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Response of corn to Zn and Cu on a salinized soil in pots has been studied. Zinc increased the dry weights of tops and roots at all levels of NaCl+CaCl2. Increasing Zn level increased the weights considerably at 10 mM NaCl+CaCl2. Copper increased the weight of tops at 10 mM NaCl+CaCl2: it had little effects on plant weights at 50–125 mM NaCl+CaCl2. The growth response of plant to low Cu was somewhat similar to that of higher Zinc. NaCl+CaCl2 treatments, in general, increased Zn concentrations in tops as well as roots. At low Zn application, Zn concentrations in the tops were higher than those in the roots but at high Zn application, the concentrations of Zn in tops were similar to those in the roots. NaCl+CaCl2 treatments increased Cu concentrations in the tops to a slight extent but had a depressive effect on those in the roots. Copper concentrations in the tops were, however, much below those in the roots. The greater retention of Cu in the roots remains to be explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145781
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