Der Einfluss von Röntgenstrahlen und Hypothermie auf den Hämoglobingehalt des einzelnen Erythrozyten neugeborener Hausmäuse

Summary New-born mice were exposed to a dosage of 600 R X-rays. If the mice were irradiated under extreme hypothermy, we found a decrease of the content of hemoglobin in the single erythrocyte below the level of animals that were subjected to irradiation or hypothermy only.     

Urease inhibition by hydroxamic acids

Summary Ureases from jack beans andRhodototorula pilimanae were observed to be inhibited by primary hydroxamic acids but were not inhibited by acyclic-secondary (N-alkyl) hydroxamic acids.This project was supported by a Lamar University organized research grant.     

Effects of sleep and arousal on the processing of visual information in the cat

Single units in the cat lateral geniculate nucleus and primary visual cortex show changes in both spontaneous and visually evoked firing as a function of the state of wakefulness. On arousal spontaneous firing is smoother and often reduced, whereas evoked responses are usually enhanced; the result is an increase in the signal-to-noise ratio. Single- and double-label 2-deoxyglucose autoradiographs show further that slow-wave sleep differentially depresses visually evoked activity in the deeper layers of the visual cortex.     

Degradation of type I collagen fibrils synthesized by human dental pulp cells in explant culture exposed toActinomyces viscosus. Electron microscope immunotyping

Summary Actinomyces viscosus Be 66, added to pulpal cells in culture, does not cause apparent cellular damage. The extracellular matrix consists of altered collagen fibrils and thin filaments, immunochemically identified as type I collagen. They probably represent the first steps of collagen degradation.This work was supported by INSERM (ATP: 77-85) and CNRS (RCP: 533).     

On the formation of the myotomes in avian embryos. An experimental and scanning electron microscope study

Summary The formation of the myotomes to chick embryos was studied by using experimental and scanning electron microscope techniques. With the aid of the quail-chick marker system, it was demonstrated that the dermatome gives rise to the myotome plate. SEM studies support the conclusion that the myotome cells originate only from the edges of the dermatome.Supported by the Deutsche Forschungsgemeinschaft (Ch 44/2).     

Fusion of microsomal vesicles

Summary Studies which indicate the fusion of rat liver microsomal vesicles show that the rate of fusion of microsomal vesicles, as revealed by electron microscopic examinations, is dependent on the fusion temperature and the amount of detergent present in the microsomal suspension.Acknowledgments. We thank Miss R. Kannler for excellent technical assistance. The electron microscopy was performed in Anatomisches Institut and the Strahlenzentrum of the University of Giessen. This investigation was supported by the Deutsche Forschungsgemeinschaft (Schu 54/5) and by the Stiftung Volkswagenwerk (AZ 11 2454).     

Respiratory function of blood and relative weight of certain organs in two species of shrew: Crocidura russula and Suncus etruscus (Soricidae mammals)]

A high oxygen capacity combined with a low oxygen affinity and a large Bohr effect achieve a high oxygen transport capacity in small shrews. The high metabolic rate (Suncus estruscus: 100 to 350 ml O2/kg. min) can be explained by the combination of the favorable blood parameters with a high relative heart weight (1,2% of body weight) and heart frequencies of 1,000 to 1,350 per minute.