Library

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
  • 1965-1969  (2)
  • Inorganic Chemistry  (1)
  • Mikropunktionstechniken  (1)
  • 1
    ISSN: 1432-2013
    Keywords: Na Transport ; Na Permeability ; K Transport ; Adrenal Insufficiency ; Micropuncture Techniques ; Na-Transport ; Na-Permeabilität ; K-Transport ; Nebenniereninsuffizienz ; Mikropunktionstechniken
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Int the proximal and distal surface tubules isotonic Na reabsorption (Φ Naout) is impaired by adrenalectomy. In the present experiments the time course of development of transtubular Na concentration differences (Na) P −(Na) TF was studied in the proximal convolution. 1. Na concentration was measured in free flow mannitol diuresis. Endproximal (Na) P −(Na) TF averaged 23.0±0.5 meq/l after 8.5±0.6 sec (controls) and 15.2±1.7 meq/l after 13.6±0.5 sec (adrenalectomized rats). 2. In modified stopped flow experiments tubular fluid, aspirated at the beginning of the proximal convolution in mannitol diuresis, was injected between two oil columnes and reaspirated after 28–36 sec of contact time. (Na) P −(Na) TF was 30.1±1.4 meq/l and 24.7±2.5 meq/l in the controls and adrenalectomized rats respectively. 3. (Na) P −(Na) TF in steady state (i. e. after 60 sec of contact time) were 33.6±0.8 meq/l and 41.8±1.2 meq/l in the 2 groups. From the results we derive at the conclusion that in adrenal insufficiency proximal sodium reabsorption is not only affected by an impairment of the intrinsic transport capacity but also by a proportional decrease of leak permeability for sodium. 4. Due to an increased transit time in adrenal insufficiency fractional reabsorption of sodium and of potassium was unchanged in the proximal convolution. Therefore it seems likely that the same compensation mechanism as for sodium holds for potassium and the reabsorption of potassium is impaired in adrenal insufficiency also in the proximal convolution.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 355 (1967), S. 145-151 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aluminium chloride gives on reduction in pyridine a radical solution whose ESR spectrum indicates spin coupling with two Al, two N and two H nuclei, the latter being protons in 6-position. It is derived that bis-(N-dichloroaluminium)-1,1′,2,2′-tetrahydro-4,4′-bipyridyl is formed, which dissociates into radicals at the C—C linkage between the two dihydropyridyl groups. This suggestion is also based on the formation of the same radical from Cl2AlH and 4,4′-bipyridyl, and on its observed NMR contact shifts.
    Notes: Aluminiumchlorid bildet bei der Reduktion in Pyridin eine (Abb. 1a, b) radikalische Lösung, deren ESR-Spektrum durch die Kopplung des Elektronenspins mit zwei Al-, zwei N- und zwei H-Kernen zu deuten ist. Versuche mit partiell deuterierten Pyridinen zeigen, daß es sich bei den Wasserstoffatomkernen um Protonen in 6-Stellung handeln muß. Die aus diesen Ergebnissen abgeleitete Struktur ist die eines Bis-(N-dichloraluminium)-1,1′,2,2′-tetrahydro-4,4′-bipyridyls, das an der Verknüpfungsstelle zweier Dihydropyridylreste in Radikale zu dissoziieren vermag. Gestützt wird diese Formulierung durch die Addition von Dichloralan Cl2AlH, an 4,4′-Bipyridyl, bei der das gleiche Radikal entsteht. Zur Ergänzung der ESR-Kopplungskonstanten wurden die „paramagnetischen Kontaktverschiebungen“ im NMR-Spektrum gemessen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...