Vergleichende Untersuchungen über verschiedene Methoden zur Bestimmung der glomerulären Filtrationsrate mit 51Cr-EDTA

Es wird über Untersuchungen an 55 Patienten berichtet, bei denen die Clearance für 51Cr-EDTA i.V., Depot-51Cr-EDTA s.c. und gleichzeitigei.v. undsc. Gabe den Ergebnissen der klassischen Inulinclearance gegenübergestellt wurde. Wenn auch bei den Depot-51Cr-EDTA-Gaben eine noch ausreichende Übereinstimmung mit den Inulinwerten gegeben war, so waren die Ergebnisse doch signifikant ungünstiger als bei Verwendung von 51Cr-EDTA i.v. im fallenden Blutspiegel. Durch die subkutane Verabreichung scheint kein ausreichender steady-state zu erreichen zu sein.

Crystallization of a multienzyme complex: fatty acid synthetase from yeast

The crystallization of purified fatty acid synthetase from yeast is facilitated by seeding techniques. The first seed crystals appeared as particles with almost negligible enzymatic activity in a solution that had been left at 4 degrees C for 15 months. Subsequently, the crystallization time has been reduced to two days, and the crystals now isolated have retained their full enzymatic activity. The loss of synthetase activity that can result from prolonged exposure during crystallization is attributable specifically to damage of the enzyme component responsible for condensation activity. Crystalline synthetase is identical to purified but noncrystalline synthetase by all criteria so far examined.

Ultrastructure of mitochondria and crystal-containing bodies in mature ballistospores of the fungus Basidiobolus ranarum as revealed by freeze-etching

By using the freeze-etch technique, a regular pattern on both sides of the outer mitochondrial membrane can be demonstrated in mature spores of Basidiobolus ranarum. Bands consisting of 5 to 10 parallel ridges, each of which is 20 nm wide, envelop the outer as well as the inner side of this membrane. Hexagonal crystals, probably representing stored protein, are enclosed in special bodies with a very smooth surrounding unit membrane. The crystals are formed by parallel rods which consist of globular subunits, 6.5 to 7.0 nm wide.

Interpretation of frozen-fractured membranes of Lipomyces lipofer

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