Volume 84, Issue 2
August 1976, pages 37-74
pp 37-41 August 1976
Histochemical study has been carried out on the localization and distribution of α-glycerophosphate, lactate, glucose-6-phosphate and 6-phosphogluconate dehydrogenases in the digenetic trematode,P. cervi. The intense reaction for these enzymes in oral sucker, subcuticle, genital cup and periphery of both testis and ovary was observed. The activity was particularly more pronounced in the parenchyma surrounding the caecum. These results suggest the existence of both Embden-Meyerhof and pentose-phosphate pathways for carbohydrate metabolism.
pp 42-49 August 1976
The procedure for thymectomy in the lizard,C. versicolor has been described. The thymus is situated in the cervical region, attached to the midventral aspect of the internal jugular vein. It is medial to the hypoglossal nerve, dorsal to the internal carotid artery, anterior to the ductus caroticus and caudal to the acute angle formed by the hypoglossal nerve and the internal jugular vein. Sodium pentobarbital and ether were used as anaesthetics. The thymus was approached through a lateral incision in the cervical region. The intervening sternomastoid muscle was pushed aside and the thymus was removed using a pair of fine forceps. Streptopenicillin powder was sprinkled over this area to avoid infection and the wound was closed with a film of kollodium. The feasibility of applying this surgical procedure for the ablation of other organs in the lizard is discussed.
pp 50-55 August 1976
The rhizome is digitately branched. It has a central cylinder, covered by the primary thickening meristem, cortex and epidermis. It undergoes annual secondary growth by the primary thickening meristem producing radially seriated conjunctive parenchyma with collateral vascular bundles to the inside and secondary cortex to the outside. The cork is storied, arising every year in the new secondary cortex.
The primary thickening meristem originates in the perivascular region of hypocotyl, which swells into a tuber-like organ due to the activity of the meristem. It extends into the basal plumular internode and to the base of perennial bud, subtended by the first plumular leaf. The rhizome originates at the epicotylar end of the hypocotyl. The perennial bud is not dormant, and continues further growth of the rhizome. It is sympodial formed by the hypopodia of successive shoots, which are dormant excepting the leader aerial shoots. The primary thickening meristem extends to the base of a new perennial bud, subtended by prophyll. The rhizome branch originates from an accessory bud lying between a perennial bud and its subtending scale.
pp 56-59 August 1976
Changes in glyoogen and glucose levels of cerebral, pleuropedal and visceral ganglia during aestivation inPila globosa were investigated. In general, a decrease in the glycogen level of cerebral and visceral ganglia, and in the glucose level of pleuropedal ganglia was observed during aestivation. Blood glucose levels are depleted on aestivation. It may be concluded that carbohydrates served as energy sources during aestivation inPila globosa.
pp 60-74 August 1976
With a view to investigating the role of the water content in spinlattice relaxation mechanism of water protons, we have measured the water content and T1 in more than one hundred sets of malignant (involved) and uninvolved human biopsies. The involved breast tissues have longer T1 as well as higher water content than those of the corresponding uninvolved tissues. In gastro-intestinal tumours the water content of the uninvolved tissue in general is not much different from that of the involved tissue although the latter have longer T1 values. A similar trend has also been observed in oral tumours. An overall comparison of the data reveals that while the increase in water content is partly responsible for the longer relaxation times in malignant tissues, there is no correlation between the T1 and water content. These results show that other mechanisms apart from the increased water content have also to be considered.