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298 results on '"Roy Choudhury S"'

1. Extensive unilobar primary pulmonary tuberculosis in an infant: A diagnostic dilemma

Author

Chadha Rajiv, Tripathi Rakesh Kumar, Singh Dharmendra, and Roy Choudhury S

Subjects
Tuberculosis, primary cavitating pulmonary tuberculosis, pulmonary sequestration, Pediatrics, RJ1-570, Surgery, RD1-811
Abstract

An 11-month old boy presented with frequent episodes of fever and cough over the past 6 months. Investigations revealed a large space-occupying lesion in the upper lobe of the left lung, the remaining lung fields being clear. There was no history of contact with tuberculosis and the tuberculin test was negative. A CT scan of the chest suggested the presence of a pulmonary sequestration in the upper lobe of the left lung. Surgical excision of the affected lobe was performed and histopathological examination of the excised lobe revealed extensive tuberculosis with caseous necrosis. The presentation of progressive primary tuberculosis in infants is discussed along with the diagnostic difficulties in cases with an atypical presentation.

Published
2005

8. Surfactant Liquid Crystals: Phase Diagrams and Phase Behavior

Author

Shin, Sung T., Kumar, Satyendra, Greenhill-Hooper, M. J., Platz, G., Thunig, C., Hoffmann, H., Sjöblom, J., Blokhus, A. M., Friberg, S., Miller, C. A., Gradzielski, M., Kramer, U., Taddei, G., Carmona-Ribeiro, A. M., Hix, S., Chachaty, C., Bredel, T., Korb, J. P., Van der Maarel§, J. R. C., Coppola, L., La Mesa, C., Ranieri, G. A., Terenzi, M., Amaral, L. Q., Itri, R., Antón, R. E., Andérez, J. M., Graciaa, A., Lachaise, J., Salager, J. L., Amorim da Costa, A. M., Jansson, Mikael, Thurmond, Robin, Brown, Michael, Khetrapal, C. L., Katre, Y. R., Solanki, S. K., Plumley, S., Kuzma, M. R., Auvray, Xavier, Rico, I., Lattes, Armand, Friberg, S. E., Wang, J. F., Sun, W. M., López, Rafael, Millán, Sonia, Fucugauchi, Luz Alicia, Fendler, Janos H., Roy Choudhury, S., Yadav, R., Maitra, A. N., Jain, P. C., Sarraf, R., Partyka, S., Keh, E., Huang, Zhi, Gu, Tiren, Varadaraj, R., Valint, P., Bock, J., Zushma, S., Brons, N., Mittal, K. L., editor, and Shah, D. O., editor

Published
1991
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50. Vasopressinergic neurons and the associated blood vessels in the rat anterior hypothalamus, an immunohistochemical study

Author

Ray, Prajnan K. and Roy Choudhury, S.

Subjects
Vasopressin immunocytochemistry, 6 - Ciencias aplicadas::61 - Medicina [CDU], Paraventricular nucleus
Abstract

The paraventricular (PVN) and supraoptic (SON) nuclei of the hypothalamic neurosecretory system have been extensively investigated by many workers. The functional aspects of vasopressin secretion (elaborated by the PVN and SON neurons) in relation to the vasculature of the anterior hypothalamus are also well documented. However, the available data concerning vasopressin (VP) functions are largely based on physiological studies. Corroborative morphological correlation with regard to this has received little attention. The present report elucidates the intricate anatomical relationships between the VP-neurons and the adjoining capillaries in the rat anterior hypothalamus. A peroxidase-antiperoxidase (PAP) immunocytochemical study, using a commercial VP antibody, was carried out for this purpose. The observations are interpreted from a functional standpoint. VP-immunostained elements, i.e. the somata and the processes (mainly dendrites), were localized (i) close to the wall, (ii) on the endothelium, and (iii) occasionally, in the lumen of the hypothalamic capillaries. The findings provide immunocytochemical evidence that the vasopressinergic elements are in direct relationship with the hypothalamic vasculature. This raises some interesting possibilities for the former to be involved in: (i) affecting the permeability of the blood-brain barrier for transport of various nutrient substances (important in aging and Alzheimer's disease), (ii) inducing an alteration in the water permeability of the brain vessels on which depends the precise adjustment of brain water content and of brain volume (fundamental to normal functioning of the brain), and (iii) serving as osmoreceptors of the blood flowing through the capillaries and thus providing a feedback mechanism for VP modulation.

Published
1990

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