In situ small angle X-ray scattering investigation of the thermal expansion and related structural information of carbon nanotube composites

In-situ thermal expansion tests on a series of carbon nanotube bucky-paper composites were performed with direct heating within a synchrotron SAXS source. The impact of the samples density and morphology as well as the chemistry and degree of decoration of the carbon nanotubes on the scattering patterns were investigated and correlated to the materials macro-properties. The results demonstrate that simple densification techniques, such as acetone dipping or gold electroless deposition, could reduce greatly the displacements of the carbon nanotubes within the structure and lead to more thermally stable material.     

Inhibition of tyrosine degradation in vivo by the dopa decarboxylase blocking agent NSD-1034

Zusammenfassung Der Stoffwechsel von H ₃ ² -3, 5-l-Tyrosin wurde in mit NSD-1034 (100 mg/kg) vorbehandelten Versuchstieren (Hähnchen, katzen) untersucht. Als Folge des durch NSD-1034 stark gehemmten Abbaus entstanden während der Versuchszeit (ca. 20 min) nahezu kein Tritiumwasser und keine aromatischen Abbauprodukte. Auch die sonst zu beobachtenden radioaktiven Metabolite des H³-Tyrosins (Glutamin- und Asparaginsäure, Dopamin und Noradrenalin) waren nicht nachweisbar. Ausserdem war der Gehalt an H³-Tyrosin in Organen behandelter Tiere höher als in Kontrollen.     

Zuchtmethode und semisynthetische Nährmedien für Apfelwickler

Summary A method for the individual rearing of the codling mothLaspeyresia pomonella is described. The method allows the collection of exactly dated eggs and the rearing of a large number of larvae in a small space. By using the second medium described, it is possible to watch all developmental stages at any time without disturbing them. The average larval survival rate is 70–80%.     

Synthesis of sulfated glycosaminoglycans by the three cell types of the rabbit cornea in culture

Summary Rabbit corneal cells were cultivated for 21 days and then exposed to Na₂ ³⁵SO₄, a precursor of sulfated glycosaminoglycans (GAG). All 3 cell types of the cornea, the fibroblasts, the epithelial as well as the endothelial cells, synthesize GAG. The fractionation-patterns of the epithelial and endothelial GAG are almost identical and differ clearly from the one of fibrolastic GAG.Supported by SNSF, grant No. 3.534.71.     

Carcinogenic activation of benzo(a)pyrene by iodine and ferric chloride in the respiratory tract of Syrian golden hamsters

Summary Benzo(a)pyrene (0.5 mg), in itself weakly carcinogenic, when given in combination with ferric chloride (0,16 mg) or iodine (0,2 mg), alone noncarcinogenic, induced a number of tumors of different parts of the respiratory tract of Syrian golden hamsters.Partially supported by Public Health Service contracts PHS 43-68-959 and NO1 CP33278 from the Division of Cancer Cause and Prevention. The authors wish to thank Mrs Virginia Ooten for her technical assistance.     

The effect of antifibrinolytic agents on wound healing in vitro

Summary The effect of antifibrinolytic agents (antiplasminogen activators) on wound healing was studied in vitro. All these substances caused the proliferating epithelium to change direction and migrate to stratum corneum, resulting in a everted epiboly formation.     

Protein synthesis and cyclic GMP content in rat cardiac muscle after swimming exercise

Summary Rats were exercised for 6 h by swimming. Phenylalanine incorporation into myocardial proteins was increased when 2 h had elapsed after the termination of exercise. Cyclic GMP concentration did not change during the experiment, which indicates that cyclic GMP does not act directly as a trigger of myocardial protein synthesis in volume overload.     

On the origin of wound arylaminopeptidases

Zusammenfassung Die Herkunft der Wundarylaminopeptidasen wurde untersucht, indem man die Enzyme von Leukozyten und von Wundgewebe jeweils bei ein und derselben Ratte verglich. Mit Hilfe von Fraktionierung und bei der Untersuchung ihrer Substratspezifizität und bei Aktivierung durch Dithiothreit zeigte sich, dass die Arylaminopeptidasen im Wundgewebe sich qualitativ von denen in den Leukozyten unterschieden. Weil wir frÜher gezeigt haben, dass sich die Wundarylaminopeptidasen auch von denen im Serum unterscheiden, können wir den Schluss ziehen, dass die Zunahme von Enzymen in Wunden erheblich in dem geschädigten Gewebe selbst während der allerfrÜhesten Heilungsphase herstammt.