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Biomedical subjects

W Kunz

Publications and source records attributed to W Kunz.

At least 145 records · Page 8Linked to original sources
PubMed1975

Underreplication of satellite dnas in polyploid ovarian tissue of Drosophila virilis.

The satellite DNAs of Drosophila virilis have been examined in diploid and polyploid tissues by isopycnic ultracentrifugation and thermal denaturation experiments. Previous work has established that the satellite DNAs are underreplicated in the polytene chromosomes of the salivary glands of D. virilis. The results of the present experiments demonstrate that this underreplication also takes place in the ovaries which contain nurse cells and follicle cells. These tissues are polyploid but do not show polytene chromosomes.

Animals↗
PubMed1972

Uber einen energieunabhängigen austausch der alkali-ionen Li(+), Na(+), K(+), Rb(+) und Cs(+) GEGEN H(+) in der membran intakter und desintegrierter rattenlebermitochondrien.

1. The energy-independent exchange of alkali metal cations against protons was investigated in intact and disintegrated mitochondria. The exchange is not specific for different alkali metal ions.2. In intact mitochondria the apparent K(m) for the energy-independent exchange range from 5 to 25 mM (Cs(+), Rb(+), K(+) 5-10 mM; Na(+) 15 mM; Li(+) 20 mM). At all ions studied the maximum release of protons was 15-20 nval/mg protein.3. In disintegrated mitochondria there are no differences between the alkali metal ions (apparent K(m) 30 mM; maximum H(+)-release 50 nval/mg protein).4. Directly accessible binding sites seem to exist in the outer membrane. Binding sites in the inner membrane are accessible only after disintegration, but not after addition of valinomycin + rotenone.

Journal Article↗