The possible role of group specific component (Gc) (vitamin D-binding protein) in the clearance of cellular actin entering the circulation was examined with 125I-labeled Gc and actin injected into a rabbit model. Although filamentous F-actin is depolymerized primarily by plasma gelsolin, 2 90%
The presence of a varicocele in adult men has been correlated with infertility. This study documents the effect of an experimentally induced unilateral varicocele in 21-day-old juvenile prepubertal and 51-day-old adult rats (n = 10 per group) on subsequent adult testicular function. Varicoceles were induced by partial occlusion of the spermatic vein. There were ten sham-operated and five nonoperated control rats in each age group. The rats were sacrificed 1 month after surgery. Intrascrotal temperatures were elevated in both groups with varicoceles. Histologically, the ipsilateral testes of rats in both age groups demonstrated a decrease in the numbers of functioning seminiferous tubules and germ cells, but the decrease was significantly greater in the juveniles than in the adult rats. No changes were seen in the contralateral testes. Significant titers of cytotoxic sperm antibodies were present in all animals with varicoceles, which is in contrast to controls. The juveniles had significantly lower antibody titers (mean log2 +/- SEM; 3.2 +/- 0.09 vs. 8.5 +/- 1.1, P less than 0.001) than the adults. The induction of a unilateral varicocele damaged spermatogenesis and testicular function to a greater extent in juveniles than in adult rats. This damage may be immune complex-mediated.
17 Verbeswrungen beim Mischen, Granulieren und Trocknen von hochenergetischen pyrotechnischen Mischungen Ubcr eine sicherere und wirksamere Methode des Mischens, Granulierens und Trocknens (MIGRAD) von hochenergetischen pyrotechnischen Mischungen wird berichtet. Es wurde dafiir ein MIGRAD-Mischer bzw. Granulator venvendet, der ausgelegt ist fur das Mischen, Granulieren und Trocknen pyrotechnischer Materialien (10-20 kg) in einer Einfach-Mischkammer. Besondere Merkmale des Prozesses sind Fernbeschickung und -entladung, Herabsetzung des Losungsmittels, verkiirzter Mischungszyklus (40 min), stufenlose Geschwindigkeitseinstellung der Misch-und Granulierwerkzeuge, nach dem neuesten Stand der Technik eingebaute Flammendetektoren und Feuermelder (UV-SO ms, IR-10 ms), Ausblasvorrichtungen, Warmekammer, Vakuumtrockner, Fernsteuerung und -iiberwachung und fernbediente Selbstreinigung des Mischers. Der MischprozeR wurde erprobt fur die Herstellung von einigen 24 pyrotechnischen Mischungen aus 5 Arsenalen bzw . Munitions-Fullanlagen. Sicherheitsdatenblatter fur die Gefahrenklassifikation wurden fur die 24 pyrotechnischen Mischungen erstellt und werden zusammen mit den resultierenden physikalischen Eigenschaften der fertigen Mischungen aufgefuhrt. Amklioration des prockdks utilisks pour mklanger, grander et sbcher les compositions pyrotechniques riches en knergie On prCsente une mtthode sdre et efficace pour mClanger, grander et skcher les compositions pyrotechniques ti haute teneur CnergCtique.On utilise i cet effect un appareil, appelt MIGRAD, qui assure le milange, la granulation et le sCchage de substances pyrotechniques (10-20 kg) dans une seule cuve. L'appareil est rempli et vide par commande 2 distance. I1 ne necessite qu'une quantitC rtduite de solvant, le melange se fait plus rapidement (40 minutes), la vitesse des outils assurant le mtlange et la granulation est r6glable de manikre continue. L'appareil est tquipt de dttecteurs de flammes et de feu de conception tr& moderne (UV-50 ms, IR-10 ms), de soupapes de sfirett, d'un s y s t h e de chauffage et de stchage sous vide, d'une tCl& commande et tClesurveillance, ainsi que d'un dispositif t6ltcommande pour I'auto-nettoyage du melangeur. Le fonctionnement de l'appareil a t t e teste sur 24 compositions pyrotechniques provenant de 5 arsenaux ou poudreries diffkrentes. Pour ces 24 compositions une ttude de stcuritt a Ctt effectute et les fiches correspondantes, ainsi que les proprittks physiques des produits obtenus sont publibes dans le prCsent document. SummaryA safer and more efficient method of mixing, granulating and dryng (MIGRAD) highly energetic (UN 1.1) pyrotechnic composition will be reported, The process uses a MIGRAD mixer/granulator that was tailored to mix, granulate and dry a pyrotechnic material (20-40 lb) within a single mixing chamber. Features of the process include remote loading and unloading, reduced solvent, shortened mixing cycle (40 min), infinitely variable speed control of mixing and granulating impellers, built-in state-of-the-art fire detect...
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