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An Independent Synthesis of Phospholipids in the Femur and Tibia of White Rats (1952)

CLAASSEN, V. ; VOGELS, R. J. ; WÖSTMANN, B.

[s.l.] : Nature Publishing Group

Nature 169 (1952), S. 191-192

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] Zilversmit et al.1 have shown that the specific activity of a component, before reaching its maximum value, must be smaller than the specific activity of its precursor. Now there are good reasons for assuming that for rats the plasma contains little or no cephalin, and that sphingomyelin accounts ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/169191a0

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Some fundamental remarks on the polarographic determination of the catalase activity and the H2O2 production of bacteria (1950)

Aussen, B. S. ; Kingma Boltjes, T. Y. ; Wöstmann, B. S. J.

Springer

Antonie van Leeuwenhoek 16 (1950), S. 65-78

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ISSN: 1572-9699

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Conclusions and summary 1. Oxygen has two polarographic waves of equal height (h.w.p. −0.05 V and −1.07 V), which disturb the direct polarographic determination of H2O2. 2. In determining H2O2 it is possible to eliminate this disturbance by reducing the total height of the waves by 2 × the height of the first O2 wave. 3. In a decomposing H2O2 solution the O2 concentration exceeds more than 5 × the normal O2 concentration in an aqueous solution. 4. In a decomposing H2O2 solution the H2O2 concentration at each moment can only be determined by taking into account the O2 concentration at that moment. 5. Determination without this correction presents too small a catalase activity and may even result in characterising catalase positive bacteria as catalase negative. 6. It is possible to demonstrate the H2O2 production of catalase negative bacteria by the polarographic method.