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  • 1
    Electronic Resource
    Electronic Resource
    Peptide YY enhances NaCl and water absorption in the rat colon in vivo (1992)
    Springer
    Cellular and molecular life sciences 48 (1992), S. 47-50 
    Details
    ISSN: 1420-9071
    Keywords: Peptide YY ; vasoactive intestinal peptide ; colon ; electrolyte and water transport ; rat ; in vivo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Peptide YY (PYY) is thought to possess paracrine and endocrine functions. The highest concentrations of this peptide are in the colonic mucosa. The effect of PYY on electrolyte and water transport in the rat colon was studied in vivo. Under urethane anesthesia, rat colonic loops were perfused at a constant rate with physiological buffer solution containing phenol red as a nonabsorbable volume marker, and net movements of water, sodium, chloride and potassium in the perfused colon were determined every 10 min. Intravenous administration of PYY produced a dose-dependent increase in the net absorption of sodium chloride and water, as well as a decrease in the net secretion of potassium. PYY inhibited the reduction in net absorption of sodium chloride and water evoked by vasoactive intestinal peptide (VIP), but did not affect the VIP-evoked increase in net potassium secretion. These findings suggest that PYY acts as an enhancer of sodium chloride and water absorption and as an antagonist to VIP-induced secretion in the colon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01923605
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  • 2
    Electronic Resource
    Electronic Resource
    Skew Young Diagram Method in Spectral Decomposition of Integrable Lattice Models (1997)
    Springer
    Communications in mathematical physics 185 (1997), S. 441-465 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: The spectral decomposition of the path space of the vertex model associated to the vector representation of the quantized affine algebra is studied. We give a one-to-one correspondence between the spin configurations and the semistandard tableaux of skew Young diagrams. As a result we obtain a formula of the characters for the degeneracy of the spectrum in terms of skew Schur functions. We conjecture that our result describes the -module contents of the Yangian -module structures of the level 1 integrable modules of the affine Lie algebra . An analogous result is obtained also for a vertex model associated to the quantized twisted affine algebra , where characters appear for the degeneracy of the spectrum. The relations to the spectrum of the Haldane-Shastry and the Polychronakos models are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002200050098
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  • 3
    Electronic Resource
    Electronic Resource
    Development of the myocardial contractile system (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 936-944 
    Details
    ISSN: 1420-9071
    Keywords: Contractile system ; fetus ; premature myocardium ; calcium ; sarcoplasmic reticulum ; contractile protein ; sarcolemma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Recent studies regarding developmental changes in the myocardial contractile system from fetal, newborn, and adult animals are reviewed. From the data obtained so far, we conclude that in the early fetus myocardial contraction is mainly dependent on Ca which enters via the sarcolemma. Ca release from the sarcoplasmic reticulum is minimal. The role of the sarcoplasmic reticulum as a source of contractile Ca increases and the role of Ca influx across the sarcolemma in contractile system decreases with development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01939887
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  • 4
    Electronic Resource
    Electronic Resource
    Naturally occurring heterocycles inducing drought resistance in plants (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 356-357 
    Details
    ISSN: 1420-9071
    Keywords: Diketopiperazines ; hydroxyproline ; drought resistance ; plant growth regulators
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary During screening of animal metabolites which induce drought resistance in plants, two diketopiperazines, cyclo(L-Hyp-L-Pro) (1) and cyclo(L-Hyp-L-Leu) (2), emerged as effective. When rice seeds were pretreated with the cyclic dipeptides (1 and2) during their germination period, the resulting seedlings showed significant resistance to water-stress caused by 0.5–1.5% NaCl solution or 2.5–5.0% mannitol solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01961283
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  • 5
    Electronic Resource
    Electronic Resource
    Changes in pollen tube behaviour induced by carbon dioxide and their role in overcoming self-incompatibility in Brassica (1989)
    Springer
    Sexual plant reproduction 2 (1989), S. 109-115 
    Details
    ISSN: 1432-2145
    Keywords: Self-incompatibility ; CO2 treatment ; Pollen tube growth ; Brassica ; Diplotaxis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Comparative studies on self-pollination after the application of high concentrations of CO2 gas, which is known to overcome the self-incompatibility reaction in Cruciferous species, have revealed significant changes in the pollen tubes of germinating grains prior to their penetration into the papilla cells. A remarkable increase in the width of the pollen tube was induced by treating the stigmatic papillae with high CO2 concentrations. The width of the pollen tube appeared to be greatest with CO2 concentrations ranging from 3% to 5%; these concentrations were also optimal for tube penetration. Callose accumulation was extensively induced in the stigmatic papilla with 10%–20% of CO2, although a typical callosic reaction remained through the ranges appropriate for blocking self-incompatibility. Observations using the scanning electron microscope (SEM) after pollination revealed that compatible pollen tubes in cross-pollinations fused completely to the papular surface during tube penetration, while in self-pollination, pollen tubes remained on the papilla with some additional diffusate. In the case of CO2 treatment for self-pollination, some pollen tubes behaved very similarly to the incompatible or compatible ones already described, while others were different from both of them: they showed a complete fusion, similar to compatible ones, with additional diffusate, similar to incompatible ones. These responses of the pollen and stigma to high CO2 concentrations are discussed with respect to their effect upon the expression of self-incompatibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00191999
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrastructural study on the stylar transmitting tissue in Japanese pear (1991)
    Springer
    Sexual plant reproduction 4 (1991), S. 95-103 
    Details
    ISSN: 1432-2145
    Keywords: Solid style ; Transmitting tissue ; Secretion ; Japanese pear (Pyrus serotina Rehd.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The stylar transmitting tissue in the mature pistil of the Japanese pear consists of its component cells and intercellular heterogeneous secretions. The cytoplasm of the periplasmic region contains two different organelles that are characteristic of floral bud development. One of these is the vesicle, which is derived from rough ER and transferred to the periplasmic region of the cell during an early stage of the floral bud. The other one is the lipid droplet, which reacts to polysaccharidic staining and is seen throughout floral bud development. The lipid droplets are closely associated with the Golgi bodies and seem to be dissolved in the vacuole. The materials found in the vacuoles appear to diffuse and pass through the cell walls as intercellular substances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196494
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  • 7
    Electronic Resource
    Electronic Resource
    Glow discharge polymerizations of tetrafluoroethylene, perfluoromethylcyclohexane and perfluorotoluene investigated by infrared spectroscopy and ESCA (1983)
    Springer
    Polymer bulletin 9 (1983), S. 502-506 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Glow discharge polymerizations of tetrafluoroethylene, perfluoromethylcyclohexane and perfluorotoluene were investigated by infrared spectroscopy and ESCA to clarify the contribution of olefinic double bonds and cyclic structures. The products formed from the three compounds were deposited as filmy polymers containing large amount of fluorine. Their polymeric chains are composed of CF, CF-CFn, CF2 and CF3 groups and have less dependency on chemical structures of the starting compounds. The polymer-forming process involves not only chain reactions via addition reaction to double bonds and via ringopening reaction but also the rupture of C-F bonds and the rearrangement of the ruptured fluorine atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265235
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  • 8
    Electronic Resource
    Electronic Resource
    Successive determinations of210PB,210PO,226RA,228RA and selected actinides in seawater and sea sediment (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 138 (1990), S. 321-330 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Plutonium 239,240 was measured using large-volume water samples from the North Pacific and its adjacent seas. The vertical profiles of239,240Pu show features that are similar to those reported in earlier papers with a subsurface maxima of around 660 m and a significant concentration increase in the North Pacific bottom waters. It became evident that the239,240Pu concentration in deep bottom water is proportional to the inventory of the nuclides in the overlying water column and that the appearent distribution ratios of the nuclides between deep-sea sediment and bottom water lie in a relatively narrow range of about 2×104 to 105, independent of sea area and warter depth. The latter implies that239,240Pu may follow a reversible-type partition process at a deep water/sediment interface. In order to substantiate this assumption, it is desirable to study the phenomenon for Pu as well as for other long-lived radionuclides, both artificial and natural. From this point of view, an analytical procedure for the successive determination of selected long-lived radionuclides was studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039855
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of polonium-210 in phosphoric acid (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 240 (1999), S. 887-891 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Polonium-210 in phosphoric acid has been recognized as a significant source of alpha contamination of processed Si-wafers for memory devices of computer. In the present work, a convenient method was developed for the determination of trace210Po in phosphoric acid of high purity. For the determination,209Po was used as a yield tracer. The present method consists of (1) addition of the tracer to 5 ml aliquot of phosphoric acid sample, (2) pH adjustment (to 2) of the sample solution to make up electrolytic solution, (3) electrodeposition for the simultaneous achievement of Po separation and preparation of counting source on stainless-steel disc, and (4) alpha-ray spectrometry. By the developed method, more than 95% of Po was separated from phosphoric acid sample onto counting disc. The minimum detectable radioactivity of210Po in 5 ml of phosphoric acid was about 0.03 mBq by counting the electrodeposited alpha-activity for 10 days under a counting efficiency of ≈30%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349867
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of polonium-210 in phosphoric acid (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 242 (1999), S. 251-251 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02345930
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