Volume 84, Issue 3
September 1976, pages 75-115
pp 75-89 September 1976
The food and water intake, body weight, and locomotor activity (wheel runs) were studied before and after stereotaxic electrolytic lesions at different planes of caudate nuclei of adult male and female albino rats. Lesions of lateral preoptic area, medial forebrain bundle and marginal regions of globi pallidi led to aphagia and adipsia lasting for 8–38 days. Locomotor activity, however, remained normal and there was no motor deficit. There was significant increase in wheel running (100%–450%), after tiny lesions in the anterior part of caudate nucleus (A 8·6) whereas marked drop (50–90%) in daily wheel running was observed with posterior lesions at A 7·6. Increase in body weight (30–35%) and food and water intake (15–20%) without any change in locomotor activity resulted after tiny symmetrical lesions involving caudate nucleus just above the globus pallidus (A 7·4). Lesions involving nucleus accumbens, medial preoptic area and ventromedio-marginal part of caudate nucleus, however led to 10–25% decrease in body weight in spite of 30–35% increase in food intake. The results suggest a differential striato-pallidal regulation of food and water intake, body weight and activity.
pp 90-94 September 1976
The roots ofAristolochia tagala Cham. are useful in important medicinal preparations. The morphology of the plant and pharmacognostical details of the root are described with suitable illustrations.
pp 95-100 September 1976
Physiological studies on the effects of hormonal imbalance on the CNS - 2. Time course of the effects of extirpation of Pars distalis on the levels of cholesterol in the brain of the frog,Rana cyanophlictis
The levels of cholesterol in the fore, mid and hind brain regions were determined in normal and Pars distalis ablatedRana cyanophlictis, at various time intervals after the operation. The time course of the effects of removal of Pars distalis showed an initial overshoot (shock effect) and a recovery phase leading to a new stabilized stage. In general ablation of Pars distalis resulted in the elevation of the levels of cholesterol during the first week after the operation (P>0·05, 0·001 and 0·001 for the fore, mid and hind brain on the first day after the operation). Regional differences in the magnitude of response were significant. A possible relationship between adrenal steroids and thyroid hormones and cholesterol synthesis is suggested.
pp 101-108 September 1976
Experiments were designed to study the effect of different growth regulators (IAA, GA3, ABA, ETH, CCC, MH) on pollen germination and pollen tube elongation inArachis hypogea. IAA greatly stimulated pollen germination while some of the chemicals (ABA, ETH) enhanced pollen tube elongation. Pollen treated with IAA, GA3 and ETH sequence caused maximal elongation of pollen tubes. Auxin seems to act at the germination stage while gibberellin at the early and ethylene at the late pollen tube stages, respectively. The results indicate that in the germination of pollen and tube elongation, there is repression-derepression mechanism operative.
pp 109-115 September 1976
The morphology of two new species of flagellates, namelyMonocercomonoides marathwadensis n.sp., fromPeriplaneta americana andM. polyphagae n.sp., fromPolyphaga indica is described. The former species is characterised by the presence of four basal granules arranged in two groups of two each, a moderately long funis and a flexible axostyle of uneven thickness. The latter has two blepharoplasts, a short, thick and rod-like funis and a filamentous axostyle. The organisms measure 6·7–14·9 × 4·6–14·4μ (9·5 × 8·2μ) and 6·7–12·3 × 4·6–10·8 μ (8·6 × 7·2μ) respectively.