Increased chemical weathering during the deglacial to mid-Holocene summer monsoon intensification.

Chemical weathering and the ensuing atmospheric carbon dioxide consumption has long been considered to work on geological time periods until recently when some modelling and natural records have shown that the weathering-related CO consumption can change at century to glacial-interglacial time scale. Last glacial to interglacial transition period is a best test case to understand the interplay between Pco-temperature-chemical weathering when a pulse of rapid chemical weathering was initiated. Here we show, from a high resolution 54 ka record from the Andaman Sea in the northern Indian Ocean, that the chemical weathering responds to deglacial to mid-Holocene summer monsoon intensification in the Myanmar watersheds.

Effect of actinomycin-D on the fat body RNA content in Dysdercus koenigii (Heteroptera: Pyrrhocoridae).

The effect of actinomycin-D on the RNA content of the total fat body was studied on day 3, 4, 5 and 6 of the first reproductive cycle in the females. Actinomycin-D exhibited its highest inhibitory effect in insects injected on day 4 and a lower degree of the effect was seen in insects injected on day 5. These results suggest that by the end of day 4, a major quantity of DNA-dependent RNA, necessary for vitellogenin synthesis, has already been synthesised and accumulated.

Histological studies on the neuroendocrine organs and retrocerebal complex of Crynodes peregrinus Fuessly (Chrysomelidae-Coleopt.).

The neuroendocrine system of Crynodes peregrinus has been described by using Alkehyde-Fuchsin technique (AF) on whole amounts and sections. Four groups of neurosecretory cells are present in the brain--including the two median groups with 18-20 cells each and two lateral groups with four cells each. The neurosecretory material (NSM) reaches the corpora cardiaca (CC) by nervi corporis cardiaci I.

Histological study on the retrocerebral-endocrine complex with special reference to neurohaemal involvement of aorta and pericardial cells in Coccinella septempunctata (L.) (Coccinellidae-Coleoptera).

About nine median neurosecretory cells (NSC) are situated in the antero-dorsal position on either side of the pars intercerebralis of the brain. No lateral NSC could be detected. The axonic bundles, after their decussation, emerge out of the brain in the form of a single nervi corporis cardiaci (NCC) on either side.

Histo-physiology of the salivary glands of the red cotton bug, Dysdercus koenigii (Pyrrhocoridae-Heteroptera)--histological, histochemical, autoradiographic and electron-microscopic studies.

1. Gross morphology, histology, histochemistry and ultrastructure of the salivary glands of Dysdercus koenigii have been studied. The mode of origin of saliva was investigated by tracer techniques.

Occurrence of intercellular bridges between follicle epithelial cells in the ovary of Apis mellifica queens.

Hitherto unknown intercellular bridges or fusomes between the follicle epithelial cells investing the oocytes of Apis mellifica queens have been observed both with light and electron microscopy. Usually each follicle cell has 2-3 intercellular bridges. In surfacial paraffin sections, the intercellular bridges can be seen to connect a series of follicle cells which may be branching.

The male accessory reproductive glands and spermatophore in Hydrophilus olivaceus (Polyphaga-Coleoptera).

1 In Hydrophilus olivaceus two pairs of accessory glands of mesodermal origin are associated with the male reproductive apparatus. The inner pair of glands (AG1) are thin-walled, recurved tubes of uniform diameter. Their histology and histochemistry was described.