Klaus-Günter Collatz

  • Citations Per Year
Learn More
1. The emulsifiers of a cricket (Gryllus bimaculatus DeGeer), two spiders (Tegenaria atrica C.L. Koch andCupiennius salei Keyserling), and a crayfish (Orconectes limosus Rafinesque) were analyzed by a simple micromethod for rapid determination of surface tension and thin-layer chromatographic separation of surface-active substances (cf. the fractionation(More)
The blowfly Phormia is currently used for studying various aspects of aging. In the context of comparative life history studies this fly can be characterized as an example of an 'r' selected type with a short life span and explosive reproduction. This is in contrast to the mecopteran fly Panorpa which shows senescence even under free living conditions and(More)
1. Whole bodies of the spider, Tegenaria atrica the fly, Protophormia terrae novae, and the crayfish, Orconectes limosus have been analyzed for their main organic constituents. The data are summarized in Table 1. Detailed analyses of the lipids including fatty acids, free amino acids and carbohydrates are given in Tables 2 to 5. 2. The main storage(More)
1. From the digestive juice of the snailHelix pomatia, two fractions with surface activity ≦42 dyne/cm (calculated for the original volume) were isolated. 2. Alkaline hydrolysis of the emulsifiers yields a mixture of fatty acids glycerol, sulfate, and wax alcohols (Table 2). An undecadienoic acid represents about 45% wt. of the fatty acid composition (Table(More)
The multiplicity of different life forms in the world of organisms contrast strikingly with the uniformity of aging mechanisms. For this reason, even insects may be employed as model organisms for aging processes. Ultrastructural changes in aging mitochondria, for example, are also known in insect physiology. Further examples are changes in biochemical(More)
The fatty acid composition in the male crayfish, Orconectes limosus, was analysed by gas-liquid chromatography. The fatty acids were found to have a specific distribution in different lipid classes. The composition corresponds to those of a “fresh water animal in winter” with the most important acids: C16∶0, C18∶1, C20∶2, C20∶4 (including about 53% of the(More)
The age-dependent variations in the amount of food ingestion, egg production, and flight activity of protein-fed female Phormia terrae novae were analyzed. Also the influence of mating and forced physical performance on the time course of these parameters and on life span were tested. In virgin females, the life span with the investigated factors is(More)