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Institute
- Biochemie und Chemie (354) (remove)
Die Bedeutung der Toleranztests für die Diagnostik der diabetischen Vorstadien wird aus den pathophysiologischen Voraussetzungen abgeleitet. Die Methode der Wahl ist der einzeitige orale Glucosetoleranztest mit 100g Glucose (oder Glucoseoligosacchariden). Dieses Verfahren erfaßt die wesentlichen physiologisch wichtigen Funktionen, was für den intravenösen Glucosetoleranztest und für den Tolbutamidtest nicht gilt. Gleichzeitig ist der orale Toleranztest am einfachsten durchzuführen. Lediglich bei Störungen im Gastrointestinalbereich kann der intravenöse Glucosetoleranztest angezeigt sein. Es gibt keine wichtige Indikation für den Tolbutamidtest.
Die verschiedenen Störmöglichkeiten sowie Fehlermöglichkeiten bei der Durchführung des Glucosetoleranztests werden besprochen.
Die Winkelabhängigkeit des ZEEMAN-Effektes der Kernquadrupolresonanzen (35Cl) eines Einkristalls von ortho-Dichlorbenzol wurde bei — 35°C vermessen. Das Kristallsystem ist monoklin. Die z-Achsen der Feldgradiententensoren im Molekül bilden einen Winkel von (64,7 ±0,5)°. Der Asymmetrieparameter des Feldgradienten hat einen Wert von 0,100 ± 0,01. Die Winkelmeßeinrichtung wird beschrieben.
The nuclear magnetic resonance of 133Cs (I=7/2) has been studied at room temperature in the isostructural compounds Cs2CuCl4, Cs2CuBr4, Cs2CoCl4 and Cs2ZnCl4. The nuclear quadrupole coupling tensors and the magnetic shift tensors have been determined at the two inequivalent sites of the unit cell for all complexes. A satisfactory description of the quadrupole coupling (νq ≲ 20 kc) with a point charge model is only possible by reducing the charge on the central ion of the MX4 tetrahedron to +1-1. Large isotropic shifts (up to 0.5%) with smaller anisotropic contributions have been found in the paramagnetic compounds. The diamagnetic Cs2ZnCl4 shows shift up to 0.03% relative to CsCl.
Es wird das Mikrowellenspektrum eines symmetrischen Kreisels (tert.-Butyljodid) untersucht, in dem sich die HFS-Komponenten des Schwingungsgrundzustandes mit denen einiger angeregten Vibrationszustände überlagern. Dabei gelingt es, eine allgemeine Methode zur Analyse eines mit den genannten Schwierigkeiten behafteten Spektrums zu entwickeln. Die Auswertung ergibt im Falle des tert.-Butyljodids folgende Konstanten: e Q q = -1709,5 ± 5,5 MHz, B = 1560,60 ± 0,01 MHz, DJ = 0,20 ± 0,10 kHz, DJK = 0,70 ± 0,07 kHz, rC-J = 2,190 ± 0,005 Å.
(NBu4)2[Co4(SPh)6Cl4] (1) and [Co4(SPh)6CU(PPh3)2] (2) are prepared by the reaction of (NBu4)[CoCl3(PPh3)] and [CoCl2(PPh3)2] with PhSSiMe3 in toluene solution. The overall description of the Co4S6Cl4 core is that o f a nearly regular Co4-tetrahedron inscribed in an irregular octahedron of the bridging S atoms resulting in an “adamantane” type cage. 1 reacts with Na[Mn(CO)5] to form the dinuclear complex (NBu4)[Mn2(SPh)3(CO)6] (4). Each Mn atom is bound to three CO and three μ2-SPh ligands. The Mn-Mn contact (318.5 pm) does not indicate metal-metal bonding.
A nucleoprotein of a vitrous consistency was extracted from the gonads of the coalfish (Gadus virens).
The preparation of deoxyribonucleic acid (DNA) from this nucleoprotein and from staphylococci is described. Both of these different kinds of DNA have been mixed with bovine serum albumin or cytochrom c respectively to produce solutions which subsequently were spread onto the Langmuir trough under defined conditions.
After transfer of aliquots from the surface monolayers to carbon support films the preparations were examined with the electron microscope. The micrographs show threads of various lengths, partly stretched, partly folded in loops, consisting of DNA molecules embedded in a protein envelope.
Measurements and calculations of 5900 particles of the complex of Gadus virens-DNA-Albumin, with relatively short threads show a distribution of discontinuous character. If length is plotted against number then it occurs that there are maxima of different lengths of threads. The abscissae of these maxima obey the ratio 1 : 2 : 4 : 8. This holds for longer threads too the maxima of which, however, have smaller ordinate values.
UV-mikrospektrophotometrische Messungen der Nucleinsäuren- und Eiweißkörper-Konzentration sowie der Kern- und Nukleolengröße nach Virusinfektion und unspezifischer Reizung der Chorion-Allantoismembran zeigen, daß es in beiden Fällen zu einer gleich starken Stimulierung des nucleinsäuren- und eiweißkörperbildenden Systems der Zelle kommt. Bei der Infektion mit Vaccinevirus auf das Ektoderm setzt die Reaktion der Membranzellen in der Eklipse ein, nach Infektion mit Newcastle-Disease-Virus fällt der Titeranstieg mit der Zellreaktion zeitlich zusammen.
Für eine Gruppe von Di- und Tripeptiden wurden die Geschwindigkeitskonstanten sowie die Arrhenius schen Aktivierungsenergien und Aktionskonstanten der sauren Hydrolyse der einzelnen Peptidbindungen gemessen. Zeitgesetz und Abstufungen der Aktivierungsenergien lassen sich nur unter bestimmten Annahmen über die Solvatation der Reaktionsteilnehmer auf der Grundlage des Ingold- Benderschen Mechanismus interpretieren. Aktionskonstante und Aktivierungsenergien weisen einen symbaten Gang auf.
Induction of the enzyme Δ5-3-ketosteroid isomerase in Pseudomonas testosteroni was found to be strongly inhibited by reserpine and by the alkaloids of Vinca and Ergot. Morphine, colchicine and papaverine caused weaker inhibition whilst a series of other alkaloids were almost ineffective. Ergot alkaloids were inhibitory towards all steroids tested, androgens, oestrogens and progestagens, and a similar effect was shown with the other inducible enzymes, 3α- and 3β.17β-hydroxysteroid-dehydrogenase.
Experiments with cell-free protein synthesis indicate that reserpine inhibits the induction of messenger RNA.
The unimolecular thermal decomposition of chloroethane-2-d3 and chloroethane-2-d1 was studied in a static system at two temperatures and at pressures between 0.1 and 10 mm Hg. The rate constants for the high pressure limit were obtained from these measurements and used to calculate the Arrhenius equations. The decomposition of chloroethane-2-d3 was also studied at high conversions and yielded almost exclusively (97%) DCl and CD2CH2 as shown by mass spectrometric analysis thus proving a molecular elimination mechanism via a four-centered reaction complex.