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Ion channels formed by the peptide gramicidin A in planar lipid membranes have been reported to react very sensitively upon irradiation of the membrane by ionizing radiation (radiolysis), by UV light (photolysis), or by visible light in the presence of appropriate photosensitizers (photodynamic inactivation). In all three cases the effect is due to the(More)
Hybrids from reciprocal erosses between twoChironomus thummi thummi andCh. th. piger laboratory stocks show four abnormalities in comparison to the parental stocks. One cross direction (Ch. th. thummi ♂ x Ch. th. piger ♀) is characterized by chromosome aberrations, reduced hatchability and malformations, whereas in reciprocal hybrids both sexes are sterile.(More)
A high-pressure-liquid-chromatographic method suitable for the separation and sensitive detection of putreanine and isoputreanine is described. This method allowed us to study the formation of the metabolites of the oxidative deamination of spermidine and N1-acetylspermidine. Administration of spermidine trishydrochloride to mice causes a time-dependent(More)
After crossing experiments between twoChironomus subspecies the HLE hybrid dysgenesis syndrome occurs non-reciprocally in the F1 hybrids if the males of each of the fourCh. th. thummi strains (HL, So, G, Kr) are crossed to females ofCh. th. piger, strain E. In hybrid egg masses, differences in the strength of the abnormal trait ‘reduced egg hatch’ were(More)
Two Giemsa banding methods (C banding and RB banding) are described which selectively stain the centromere bands of polytene salivary gland chromosomes in a number of Chironomus species. — By the C banding method the polytene chromosome appearance is changed grossly. Chromosome bands, as far as they are identifiable, are stained pale with the exception of(More)
Females of Chironomus thummi thummi (stock H1) were backcrossed with hybrid males of the cross Ch. thummi thummi (H1) ♀♀ x Ch. thummi piger (E) ♂♂ in order to test which of the four piger chromosomes determine the temperature sensitive non-reciprocal gonadal dysgenesis originally observed in the thummi ♀♀ x piger ♂♂ hybrids. In the backcross rudimentary(More)
Mitotic and meiotic chromosomes of Schistocerca gregaria were C-, mild N- and strong N-banded. After C-banding, three out of eleven autosomes show, in addition to the centromeric C-bands, a second C-band. — The mild N-banding method produces a single N-band in each of only four chromosomes. With the exception of one N-band these mild N-bands correspond to(More)