Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Chemistry  (9)
  • Melatonin  (2)
  • Quantitative Histochemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Activity of (Na+K+)-stimulated adenosintriphosphatase in the rat nephron (1969)
    Springer
    Pflügers Archiv 306 (1969), S. 219-226 
    Details
    ISSN: 1432-2013
    Keywords: (Na+K+)-ATPase ; (Mg++)-ATPase ; Rat ; Nephron ; Quantitative Histochemistry ; (Na+K+)-ATPase ; (Mg++)-ATPase ; Ratte ; Nephron ; Quantitative Histochemie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In 17 male Wistar rats in antidiuresis 10 different nephron segments and arteries are identified with the aid of Lowry's technique, dissected and total-and (Mg++)-adenosintriphosphatase (=ATPase) determined. (Na+K+)-activated ATPase in the distal tubule is four to five times (max. eight times) more active than in the proximal segment. This difference of activity may speak for a high pump mechanism mediated by the way of a (Na+K+)-activated enzyme system in the distal nephron and for a partially passive reabsorption of sodium from the proximal convolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00592433
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The antigonadotrophic effect of melatonin in Syrian hamsters is modulated by prostaglandin (1994)
    Springer
    Journal of neural transmission 95 (1994), S. 173-177 
    Details
    ISSN: 1435-1463
    Keywords: Melatonin ; antigonadotrophic ; prostaglandin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary PGE2 was shown to play an essential role in the gonado-inhibiting effect of melatonin in Syrian hamsters by transforming the neuroendocrine signal to gonadal reactivity. Prostaglandin is a vital link in the transduction of photoperiodic information into gonadal function and the difference in its levels brought about by melatonin given at different times of the day could explain the phenomenon why gonadal involution occurs only upon administration of melatonin towards the end of the day. It appears also that the melatonin signal is decoded in the pituitary, probably involving the short loop negative feedback of LH on LH-RH hormones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01271564
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Modification by oxazepam of the diurnal variations in brain125I-melatonin binding sites in sham-operated and pinealectomized rats (1992)
    Springer
    Journal of neural transmission 89 (1992), S. 155-166 
    Details
    ISSN: 1435-1463
    Keywords: Melatonin ; oxazepam ; pinealectomy ; circadian ; diurnal ; brain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Sham-operated and pinealectomized male rats were maintained at 14h light: 10 h dark cycles (lights-on 5.00 h) and injected daily, for 14 days, with oxazepam or vehicle.125I-melatonin binding was recorded in synaptosomes prepared at 10.00, 18.00, and 24.00 h from the hypothalamus, hippocampus and medulla-pons of the rats. In the sham-operated, vehicle treated rats, specific125I-melatonin binding in all brain areas studied was higher at 18.00 h, whereas in the oxazepam-treated animals, binding was higher at 24.00 h than at the other times tested. In the pinealectomized, vehicle-treated rats, the binding recorded at 18.00 h in all three brain areas, was lower than at the other times of day tested. Oxazepam treatment decreased125I-melatonin binding at 24.00 h in the hippocampus and medulla-pons of the pinealectomized rats and did not significantly affect the binding in the hypothalamus. These results indicate the ability of oxazepam, pinealectomy and their combination, to manipulate the diurnal variations in125I-melatonin binding sites in the rat brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01250668
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Drugs for chiral discrimination: Non-coded amino acids and dipeptides by asymmetric hydrogenation (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 10 (1998), S. 535-539 
    Details
    ISSN: 0899-0042
    Keywords: asymmetric hydrogenation ; non-coded amino acids ; enantioselectivity ; dipeptides ; diastereoselectivity ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The enantiomers of Propranolol, Pindolol, and Carazolol, well-known β-blockers, have been used to prepare cationic aminophosphine phosphinite rhodium complexes. Propraphos-Rh and Pindophos-Rh are very efficient catalysts in the asymmetric hydrogenation of N-Boc-protected unusual dehydroamino acid derivatives. Carazolol-Rh is less suitable in both activity and enantioselectivity. Under the same conditions, N-Boc-protected dehydrodipeptides are hydrogenated with diastereoselectivities between 70 and 90% de. Chirality 10:535-539, 1998. © 1998 Wiley-Liss, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 5
    Electronic Resource
    Electronic Resource
    Unusual amino acids VI. Substituted arylamino acids by asymmetric hydrogenation of N-Cbz and N-Boc protected dehydroamino acid derivatives (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 8 (1996), S. 173-188 
    Details
    ISSN: 0899-0042
    Keywords: amino acids ; chiral rhodium complexes ; aminophosphine-phosphinite ; D- and L-enantiomers ; NMR spectra ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Substituted N-Cbz and N-Boc protected arylamino acrylic acids and esters have been prepared and used in asymmetric hydrogenations catalyzed by PROPRAPHOSRh. Stereoselectivities 〉 90% ee could be achieved, the rate of which is dependent on the position of the substituent in the aromatic ring. The N-Boc derivatives provide advantages compared with the N-Cbz analogues. The amino acid derivatives were fully characterized by 19F, 13C, and 1H NMR spectroscopy. © 1996 Wiley-Liss, Inc.
    Additional Material: 12 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 6
    Electronic Resource
    Electronic Resource
    Herstellung von Metall-Matrix-Verbundwerkstoffen mit metallischen Gläsern (1988)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 19 (1988), S. 36-40 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Metal-matrix Composites with Metallic GlassesMetallic glass ribbons are well known for their very high tensile strengths. Since they offer an attractive potential of low-cost volume production, the development of a metallic glass-metal matrix composite should be very attractive. This paper reports first results on the feasibility of fabricating such composites by surface plating or incorporation by various techniques.The influence of fabrication methods on the interfacial bonding was investigated by means of cross-sectional light and electron microscopy.
    Notes: Metallglas-Bänder zeichnen sich durch sehr hohe Zugfestigkeit und kostengünstige Herstellung aus, so daß die Entwicklung eines Metallglas-Metallmatrix-Verbundwerkstoffes ausgesprochen interessant erscheint.Die vorliegende Arbeit berichtet über erste Ergebnisse, solche Verbundwerkstoffe durch Oberflächenbeschichten, verschiedene Einbettmethoden bzw. ein Festkörperreaktionsverfahren herzustellen.Dabei wird vorallem der Einfluß der Herstellungsmethoden auf die Grenzflächenhaftung licht- und elektronenmikroskopisch untersucht.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19880190107
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Differential enzymatic behaviour of single proximal segments of the superficial and juxtamedullary nephron (1969)
    Springer
    Clinical and experimental medicine 151 (1969), S. 93-102 
    Details
    ISSN: 1591-9528
    Keywords: Rat ; Nephron ; Alkaline Phosphatase ; ATPases ; Quantitative Histochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary With three phosphohydrolases, i. e. alkaline phosphatase (Na+K+), ATPase and (Mg++) ATPase, a segmentation of the proximal tubule and a marked difference between the short (superficial) and long (Juxtamedullary) nephron is revealed by quantitative histochemistry. With the exception of the superficial nephron of the male rat, alkaline phosphatase activity increases along the proximal tubule independent of sex. (Na+K+) ATPase and (Mg++) ATPase show in both types of nephrons a decrease of activity along the proximal tubule. The juxtamedullary nephron is more active than the superficial. Parallelism of the site of avtivity for alkaline phosphatase and the location of reabsorption of phosphate ions is discussed. Morphological and physiological data from the literature are brought into connexion with the enzymatic changes of a (Na+K+) ATPase activity decrease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02044665
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Komplexkatalyse. XV. Kationische η3-Allyl-bis(triorganylphosphit)nickel(II)-Komplexe als Katalysatoren für die stereoreguläre Butadienpolymerisation (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 1-11 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complex Catalysis. XV. Cationic η3-Allyl-bis(triorganylphosphite)nickel(II) Complexes as Catalysts for the Stereoregular Butadiene PolymerisationSynthesis and catalytic properties of [C3H5NiL2]PF6 complexes 1a-f with L = tri-ethyl-, -isopropyl-, -phenyl-, -o-tolyl-, -thymyl- and o-biphenylylphosphite are described. It is shown how electronic and steric effects of the phosphite ligands in these complexes control their catalytic activity and selectivity in 1,4-polymerization of butadiene.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260102
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    The Oxidation of Normal Aliphatic Aldehydes. Evidence for a chain termination by combination of acyl and alkyl radicals (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 502-504 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260319
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Komplexkatalyse. XIX. Mitteilung: R. Taube u. U. Schmidt, Z. Chem. 17, 349 (1977).. α-Olefin-Einschub in die Trihapto-allyl-nickel(II)-Gruppierung: Synthese und Eigenschaften von Bis(pentahapto-1,8-nonadien-5-yl-nickel(II)-difluorophosphat)Professor Kurt Issleib zum 60. Geburtstage gewidmet (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 458 (1979), S. 273-280 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Complex Catalysis. X. α-Olefin Insertion into the Trihapto-allyl-nickel(II) Group: Synthesis and Properties of Bis(pentahapto-1,8-nonadiene-5-yl-nickel(II)-difluorophosphate)By reaction of (h3-C3H5)2Ni with difluorophosphoric acid in ether under addition of 1,5-hexadiene bis(pentahapto-1,8-nonadiene-5-yl-nickel(II)-difluorophosphate) could be synthesized in good yield, proving thereby preparatively the 1,2-addition of the trihapto-allyl-nickel(II) fragment to the double bond of an α-olefin for the first time.
    Notes: Durch Reaktion von (h3-C3H5)2Ni mit Difluorophosphorsäure in Ether unter Zusatz von 1,5-Hexadien konnte in guter Ausbeute Bis(pentahapto-1,8-nonadien-5-yl-nickel(II)-difluorophosphat) dargestellt und damit erstmalig die 1,2-Addition des Trihaptoallyl-nickel(II)-Fragments an die Doppelbindung eines α-Olefins präparativ bewiesen werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794580137
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...