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  • Springer  (42)
  • International Union of Crystallography  (3)
  • Oxford University Press  (2)
  • American Association of Petroleum Geologists  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Gel permeation chromatography for characterization of graft copolymer (1980)
    Springer
    Polymer bulletin 2 (1980), S. 321-324 
    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 The present paper describes the grafting of vinyl monomers onto cellulose nitrate in non-aqueous medium using benzoyl peroxide as a catalyst. The complete separation of the homopolymers and graft copolymer was carried out by selective solvent extraction. The graft copolymer was characterized by IR spectra. The GPC was used as a technique to differentiate between homopolymer, polymer mixture, polyblend, and graft copolymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266708
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  • 2
    Electronic Resource
    Electronic Resource
    Structural considerations from dielectric measurements on the aliphatic alcohols (1975)
    Springer
    Journal of solution chemistry 4 (1975), S. 299-310 
    Details
    ISSN: 1572-8927
    Keywords: Dielectric constant ; ethanol ; high pressure ; Kirkwoodg K factors ; liquid association ; methanol ; n-propanol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Precise static dielectric constants are reported for methanol, ethanol, andn-propanol at 10,25, and 40° C and at pressures up to 3 kbar. The measurements were carried out by a low-frequency bridge method using a threeterminal, all-glass cell. An uncertainty of 0.05% is claimed for the data. The results are compared to data from previous investigations, whith the agreement in the absolute magnitude poor but the agreement in the pressure coefficient reasonable in most cases. The data are analyzed in terms of the Kirkwood correlation factorg K as obtained from the Fröhlich equation. In all cases, theg K factor decreases with increased pressure. The problems involved in calculating this factor from the experimental data are discussed, and it is shown that the trends ing K are very dependent upon the assumptions made in isolating the liquid dipole moment from its gas-phase value. This fact also indicates that an interpretation of theg K values in terms of stepwise association of correlation dipoles is premature at this time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650388
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  • 3
    Electronic Resource
    Electronic Resource
    The pressure dependence of the dielectric constant and density of acetonitrile at three temperatures (1977)
    Springer
    Journal of solution chemistry 6 (1977), S. 357-367 
    Details
    ISSN: 1572-8927
    Keywords: High pressure ; dielectric constants ; density ; acetonitrile ; temperature dependence ; Kirkwoodg factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The static dielectric constant of liquid acetonitrile is reported at 10, 25, and 40°C and at pressures up to 3 kbar. Densities of pure acetonitrile were measured where needed in order to analyze the dielectric measurements using the Kirkwood-Fröhlich equation. The Kirkwood correlation factorg K was found to be less than unity with a positive temperature but negative pressure coefficient, suggesting an increasing anticorrelation of dipoles with decreased temperature and increased pressure. Theg K factors are analyzed by a dipole pair-bonding model as outlined by Dannhauser and Flueckinger in which the lowg K values are attributed to the presence of dimers consisting of completely anticorrelated dipoles. The implication of this model on other measurements, especially MNR relaxation studies, is examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647050
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  • 4
    Electronic Resource
    Electronic Resource
    Hydrogen permeation during zinc-manganese alloy plating (1993)
    Springer
    Journal of applied electrochemistry 23 (1993), S. 358-363 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Electrodeposition of metals from solution is usually accompanied by the simultaneous discharge of hydrogen ions or water molecules. When hydrogen is liberated at an iron/steel surface during electrodeposition, a portion of the hydrogen is absorbed by the metal surface and then diffuses into the interior. The diffused hydrogen produces some detrimental effects, such as reduction in ductility and loss in mechanical strength, leading to hydrogen embrittlement. The present paper reports investigations on hydrogen permeation measurements in zinc-manganese alloy deposition using a modified electrode clamp for easy removal and fixing of the electrode. Hydrogen permeation studies indicate that the porosity of the deposit increases in the following order:Zn-Mn(14.3%), Zn-Mn(2.4%), Zn-Mn(24.8%) and Zn-Mn(37.5%).This is in agreement with the corrosion data obtained which indicates that Zn-Mn alloy deposits with low manganese content show better performance than pure zinc deposits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296692
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  • 5
    Electronic Resource
    Electronic Resource
    Toxicity of β- and -γ-hexachlorocyclohexane in rats of different ages (1991)
    Springer
    Bulletin of environmental contamination and toxicology 47 (1991), S. 623-627 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01700955
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  • 6
    Electronic Resource
    Electronic Resource
    Changes induced by hexachlorocyclohexane isomers in rat liver and testis (1988)
    Springer
    Bulletin of environmental contamination and toxicology 41 (1988), S. 531-539 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02020997
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of dietary curcumin and cholesterol on the progression of experimentally induced diabetes in albino rat (1995)
    Springer
    Molecular and cellular biochemistry 152 (1995), S. 13-21 
    Details
    ISSN: 1573-4919
    Keywords: curcumin ; diabetes ; hyperglycemia ; lipid peroxidation ; urinary metabolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Effect of feeding 0.5% curcumin diet or 1% cholesterol diet was examined in albino rats rendered diabetic with streptozotocin injection. Diabetic rats maintained on curcumin diet for 8 weeks excreted comparatively less amounts of albumin, urea, creatinine and inorganic phosphorus. Urinary excretion of the electrolytes sodium and potassium were also significantly lowored under curcumin treatment. Dietary curcumin also partially reversed the abnormalities in plasma albumin, urea, creatinine and inorganic phosphorus in diabetic animals. On the other hand, glucose excretion or the fasting sugar level was unaffected by dietary curcumin and so also the body weights were not improved to any significant extent. Diabetic rats fed curcumin diet had a lowered relative liver weight at the end of the study compared to other diabetic rat groups. Diabetic rats fed a curcumin diet also showed lowered lipid peroxidation in plasma and urine when compared to other diabetic groups. The extent of lipid peroxidation on the other hand, was still higher in cholesterol fed diabetic groups compared to diabetic rats fed with control diet. Thus, the study reveals that curcumin feeding improves the metabolic status in diabetic condition, despite no effect on hyperglycemic status or the body weights. The mechanism by which curcumin improves this situation is probably by virtue of its hypocholesterolemic influence, antioxidant nature and free radical scavenging property.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01076459
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  • 8
    Electronic Resource
    Electronic Resource
    Hypolipidemic action of curcumin, the active principle of turmeric (Curcuma longa) in streptozotocin induced diabetic rats (1997)
    Springer
    Molecular and cellular biochemistry 166 (1997), S. 169-175 
    Details
    ISSN: 1573-4919
    Keywords: curcumin ; diabetes mellitus ; cholesterol metabolism ; hypolipidemic action
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Streptozotocin-induced diabetic rats were maintained on 0.5% curcumin containing diet for 8 weeks. Blood cholesterol was lowered significantly by dietary curcumin in these diabetic animals. Cholesterol decrease was exclusively from LDL-VLDL fraction. Significant decrease in blood triglyceride and phospholipids was also brought about by dietary curcumin in diabetic rats. In a parallel study, wherein diabetic animals were maintained on a high cholesterol diet, the extents of hypercholesterolemia and phospholipidemia were still higher compared to those maintained on control diet. Curcumin exhibited lowering of cholesterol and phospholipid in these animals also. Liver cholesterol, triglyceride and phospholipid contents were elevated under diabetic conditions. Dietary curcumin showed a distinct tendency to counter these changes in lipid fractions of liver. This effect of curcumin was also seen in diabetic animals maintained on high cholesterol diet. Dietary curcumin also showed significant countering of renal cholesterol and triglycerides elevated in diabetic rats. In order to understand the mechanism of hypocholesterolemic action of dietary curcumin, activities of hepatic cholesterol-7a-hydroxylase and HMG CoA reductase were measured. Hepatic cholesterol-7a-hydroxylase activity was markedly higher in curcumin fed diabetic animals suggesting a higher rate of cholesterol catabolism. (Mol Cell Biochem 166: 169-175, 1997)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006819605211
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  • 9
    Electronic Resource
    Electronic Resource
    Influence of dietary capsaicin and onion on the metabolic abnormalities associated with streptozotocin induced diabetes mellitus (1997)
    Springer
    Molecular and cellular biochemistry 175 (1997), S. 49-57 
    Details
    ISSN: 1573-4919
    Keywords: capsaicin ; onion ; diabetes mellitus ; metabolic abnormalities ; hypolipidemic action
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Effect of feeding 15 mg% capsaicin diet or 3% freeze dried onion powder containing diet were examined in albino rats rendered diabetic with streptozotocin injection. Diabetic rats maintained on onion diet for 8 weeks excreted comparatively less amounts of albumin, urea, creatinine and inorganic phosphorus. Dietary onion also partially reversed the abnormalities in plasma albumin, urea, creatinine and inorganic phosphorus in diabetic animals. Onion also produced a significant reduction in hyperglycemic status of diabetic animals. Diabetic rats maintained on onion diet had a lowered relative liver weight at the end of the study compared to diabetic control group. Diabetic rats fed onion diet also exhibited lowered lipid peroxides in circulation and in urine when compared to diabetic control group. Blood cholesterol was lowered significantly by dietary onion in diabetic animals. Cholesterol decrease was exclusively from LDL-VLDL fraction. Significant decrease in blood phospholipids and tr iglycerides also brought about by dietary onion. Hepatic cholesterol, triglycerides, phospholipids which were elevated under diabetic condition were countered significantly by dietary onion. Dietary capsaicin did not have any significant influence on any of the parameters tested in diabetic rats. Thus, the study reveals that onion feeding improves the metabolic status in diabetic condition, probably because of its hypoglycemic as well as hypocholesterolemic effect. (Mol Cell Biochem 175: 49–57, 1997)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006881027166
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  • 10
    Electronic Resource
    Electronic Resource
    Amelioration of renal lesions associated with diabetes by dietary curcumin in streptozotocin diabetic rats (1998)
    Springer
    Molecular and cellular biochemistry 181 (1998), S. 87-96 
    Details
    ISSN: 1573-4919
    Keywords: curcumin ; diabetes mellitus ; renal lesions ; albuminuria ; renal tubular enzymes ; renal membrane fatty acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Curcumin, the coloring principle of the commonly used spice turmeric (Curcuma longa) was fed at 0.5% in the diet to streptozotocin-induced diabetic Wistar rats for 8 weeks. Renal damage was assessed by the amount of proteins excreted in the urine and the extent of leaching of renal tubular enzymes: NAG, LDH, AsAT, AlAT, alkaline and acid phosphatases. The integrity of kidney was assessed by measuring the activities of several key enzymes of the renal tissue: glucose-6-phosphate dehydrogenase, glucose-6-phosphatase, and LDH (Carbohydrate metabolism), aldose reductase and sorbitol dehydrogenase (polyol pathway), transaminases, ATPases and membrane PUFA/SFA ratio (membrane integrity). Data on enzymuria, albuminuria, activity of kidney ATPases and fatty acid composition of renal membranes in diabetic condition suggested that dietary curcumin brought about significant beneficial modulation of the progression of renal lesions in diabetes. These findings were also corroborated by histological examination of kidney sections. It is inferred that this beneficial ameliorating influence of dietary curcumin on diabetic nephropathy is possibly mediated through its ability to lower blood cholesterol levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006821828706
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