Juvenile hormone I is the principal juvenile hormone in a hemipteran insect,Riptortus clavatus

Juvenile hormone I (JH I) was identified by combined gas chromatography/mass spectrometry as the predominant JH in the hemolymph of female adults of the bean bug,Riptortus clavatus (Thunberg) (Hemiptera: Alydidae). Among JH I, II, and III, JH I was the most effective hormone for inducing the synthesis of yolk proteins in diapause adults.     

Cerebral neurosecretions and regulation of moulting in a haematophagous insectPanstrongylus megistus, (Heteroptera,Reduviidae)

Summary 2 factors elaborated by distinct neurosecretory cells in the pars intercerebralis control moulting inPanstrongylus megistus. The 1st, originating probably in the A cells, activates the thoracic gland. The 2nd, produced by the A cells, acts at an earlier stage in a different way.Supported by CNPq., Brésil and DGRST (aide No. 76.7.0716).     

Crystals of reinke in the nuclei of human testicular interstitial cells

Zusammenfassung Es wird gezeigt, dass in den Leydig'schen Zwischenzellen die Reink'schen Kristalle auch im Zellkern vorkommen und darauf hingewiesen, dass eine Modifikation des Zellkernstoffwechsels zu diesen Bildungen führen könnte.

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This study is supported by a grant from the N.H. & M.R.C.     

On mitochondrial inclusions in granulosa lutein cells of pregnant cows

Zusammenfassung Im Gelbkörper von Kühen wurden während der Periode von 80–240 Trächtigkeitstagen in den Granulosaluteinzellen Einschlüsse gefunden, die beinahe ganze Mitochondrien ausfüllten. Die Elektronendichte war der von Fett-Tröpfchen ähnlich. Die Einschlüsse könnten morphologisch dahin deuten, dass die Mitochondrien zur Steroidsynthese der Granulosazellen enge Beziehungen haben.

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Supported by the F.A.O. Veterinary Faculty for F.A.O.-Fellows and Scholars, The Royal Veterinary and Agricultural University, Copenhagen, Denmark.     

Ciliated biliary epithelial cells in the livers of non-human primates

Zusammenfassung Das Vorkommen von Kinocilien im Epithel der intrahepatischen Gallenwege bei einer Affenart (Saimiri sciureus) wird beschrieben. Diese Cholangiocilien finden sich relativ häufig in vollständig normalen Lebern bei dieser Affenspezies. Die Ultrastruktur dieser Cilien variiert entsprechend der Schnitthöhe und stimmt mit dem typischen Bau der Cilien anderer Zellen überein.     

Intramitochondrial inclusions in maturing and senescent muscle cells of rat myocardium

Summary Intramitochondrial myelin-like structures were found in ventricular myocardial cells of the rat heart. These inclusions were found in both the first 2 postnatal weeks and in senescent stages. The origin of such myelin-like structures could be related to an age-dependent metabolic change, specifically to an inability to oxidize long-chain fatty acids described in both periods.Acknowledgment. This work was supported by grant No. 801/82 of CAICYT.     

Histochemical localization of lipids in the nuclei of human blood and haemopoietic cells

Zusammenfassung Die Anwesenheit von Lipiden im Kern der Zellen des Blutes und der hämopoetischen Organe wurde histochemisch nachgewiesen. Die Lipide scheinen ausschliesslich oder stark überwiegend in der Kernmembran und in den Nukleolen lokalisiert zu sein.     

Dual activity of the pars intercerebralis of Panstrongylus megisturs (Heteroptera, Reduviidae) in the control of oogenesis and molting]

The action of A and A' cells of the pars intercerebralis of P. megistus on female gonial mitosis and meiosis is established experimentally by selective ablations and by implantations of brains devoid of their A cells. Molting is dependent on two factors originating in each neurosecretory cell type.     

The glycocalyx of the epithelial cells of the colon, observed in normal and ulcerous colitic conditions.

Biopsies of subjects affected by ulcerous colitis were stained with ruthenium Red. Alterations of the cellular coat and glycocalyx of the epithelial cells of the colon were identified.     

Nonrandom association of acrocentric chromosomes in human epithelial cells

Summary In diploid, aneuploid and polyploid cells of a human epithelial finite cell line, a statistically significant higher frequency in the involvement of D's than G's in acrocentric chromosome associations was found.Acknowledgments. This work is supported by grant 0044-331 from the National Research Foundation of Greece. We thank Miss M. Margaronis for technical assistance.