Browsing by Author "Ray, S"
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Item Action of an algicide from a cyanobacterium, Oscillatoria laetevirens, on photosystem II.(2001-12-23) Shrivastava, R; Ray, S; Bagchi, S NOscillatoria laetevirens produces an algicide, named oscillatorin (OS), which inhibits growth of higher plants. Effect of purified oscillatorin and some 'urea-triazine type' herbicides was studied on photosystem II activity and composition of pigment protein complex in spinach thylakoid membrane. For oscillatorin the I50 at 10 microg chlorophyll concentration, inhibitor constant (Ki), specific binding sites and Hill coefficient were calculated to be 1.45, 0.15, 2.3 and 0.2 microM respectively. Metribuzin and oscillatorin affected towards the donor side and brought about identical changes in polypeptide composition of PSII complex. Further, metribuzin and atrazine exerted antagonistic and synergistic responses on oscillatorin action. Some of these parameters were also studied on weed plants to assess upon the weedicidal potential of oscillatorin.Item Altered lipid peroxidation and antioxidant potential in human uterine tumors.(1999-05-24) Ray, S; Chakrabarti, PA comparative study of lipid peroxidation and antioxidant potential has been made in human uterus and uterine tumor. Two types of uterine tumor used are: tumor (I), a fibroid which is the commonest benign solid tumor in uterus and tumor (II), an adenomyoma. Tumor microsomes are less susceptible to lipid peroxidation induced by both enzymic (NADPH-ADP-Fe3+ and xanthine-xanthine-oxidase) and non-enzymic (ascorbate-Fe2+) systems except in the case of tumor (II) microsomes when induced with xanthine-xanthine oxidase. Resistance of tumor microsomes to lipid peroxidation is associated with the low content of substrates in the form of polyunsaturated fatty acids (PUFAs), higher level of alpha-tocopherol, reduced glutathione and protein thiols and altered enzymic antioxidant potential (catalase and superoxide dismutase).Item An analysis of response to neo‑adjuvant chemotherapy in patients with locally advanced breast cancer with emphasis on pathological complete response.(2014-10) Narendra, H; Thomas, J; Ray, S; Fernandes, D JCONTEXT: In India, most breast cancer women present at a locally advanced stage. Routine practice in majority of the cancer centers is to administer neo‑adjuvant chemotherapy (NACT) followed by loco‑regional treatment. Surgery is scheduled after 3 or 4 cycles. The patients who achieve pathological complete response (pCR) are expected do well. AIMS: The present study was conducted to analyze our results with NACT, to know pCR rate, to compare pCR rates among various subgroups and to determine the factors which predict pCR. SETTINGS AND DESIGN: The study was conducted in a tertiary care university affiliated cancer hospital in South India. SUBJECTS AND METHODS: All patients with non‑metastatic locally advanced breast cancer and agreed by the hospital tumor board to receive NACT were included. At each visit, response was assessed according to RECIST criteria. Re‑staging work up and mammography was done prior to surgery. STATISTICAL ANALYSIS USED: Chi square test was used to analyze categorical variables and uni and multivariate analysis were performed to determine the factors predicting pCR rates. RESULTS: A total of 84 patients received NACT. Median age was 46 years (ranged from 28 to 66), 46 patients were premenopausal. Totally 72 patients completed the full course before surgery. Clinical response was complete in 26, partial in 52 and 3 had local progression, one stable and two patient developed distant metastasis. Forty‑eight patients underwent modified radical mastectomy and breast could be conserved in 34 patients, pCR rate was 36%. CONCLUSIONS: Compared with historical controls particularly from India, we could achieve higher pCR rates.Item Analytical Study of Upper Gastrointestinal Endoscopy – 200 cases(Educational Society for Excellence, 2016) Ray, S; Patel, H; Kotecha, J; Parmar, H.Background: Esophagogastroduodenoscopy (EGD) is an important tool to visualize the upper part of the gastrointestinal tract up to the duodenum. It has the added advantage of being not only a diagnostic but also a therapeutic tool. It’s importance in follow up cases is also well documented. It has indeed become a cost effective and reliable tool to modern surgery. Materials and methods: Clinically symptomatic cases of upper GI tract were made to undergo Upper GI Endoscopy after an informed written consent. The study covered 200 patients who were then analysed for different parameters. Our study showed that majority of patients were in their 3rd decade with a male: female ratio of 2.03:1. Pain in abdomen was the main presenting complaint. Study showed that 62% of patients were smokers whereas 71% were non alcoholic. Gastritis was the prominent finding in 41 (20.5%) cases followed by Hiatus Hernia and Reflux Esophagitis in 19.5% and 13% respectively. The study was found to be normal in 28 cases (14%). This study was also able to detect rare findings like esophageal polyp and Mallory Weiss tear. Endoscopy was also done in post Gastojejunostomy patients to assess the stoma from within. Conclusion: Endoscopy has proved to be a valuable tool in diagnosing as well as therapeutically treating patients with various pathologies. Upper GI endoscopy correlated well with the sign and symptom presentations in majority of patients and proved superior to conventional radiological studies. Thus endoscopy is not only useful and superior to many radiological investigations, but also helpful in therapeutic interventions as well as in follow up cases.Item Antibacterial activity of local anaesthetics procaine & lignocaine.(1988-05-01) Dastidar, S G; Das, S; Mookerjee, M; Chattopadhyay, D; Ray, S; Chakrabarty, A NItem Antibacterial activity of the antiinflammatory agent diclofenac sodium.(1998-01-16) Annadurai, S; Basu, S; Ray, S; Dastidar, S G; Chakrabarty, A NAntimicrobial property of ten antiinflammatory drugs was tested with eleven sensitive bacteria belonging to both Gram positive and Gram negative types. Since most of the bacteria were moderate to highly sensitive to diclofenac (Dc), this compound was tested in vitro against 397 bacteria, most of which were inhibited by Dc at 50-100 micrograms/ml level. When tested in vivo, Dc at 1.5 and 3.0 micrograms/g body weight of a Swiss strain of white mice, could significantly protect the animals challenged with 50 MLD of Salmonella typhimurium NCTC 74. According to chi 2 test the in vivo data were highly significant (P < 0.001).Item "Aplastic anemia-paroxysmal nocturnal hemoglobinuria syndrome".(1989-07-01) Ray, S; Marwaha, N; Sarode, RItem Breast conserving surgery for breast cancer: Single institutional experience from Southern India.(2011-10) Narendra, H; Ray, SContext: In India, breast conservation rates vary anywhere from 11 to 34%. This is in contrast to western world where breast conservation rates exceed 70% for early breast cancer. Aims: The present study was conducted to analyze the results of breast conservation surgery (BCS) at our institute and compare with that of other facilities in world. Settings and Design: The study was a prospective, outcome analysis study. All patients who underwent BCS were included. Data pertaining to clinical, pathological characteristics and treatment related outcomes were recorded. Materials and Methods: The study comprised of retrospective collection of prospective data of 88 patients who underwent breast conservation treatment (BCT) till December 2009. Statistical Analysis Used: The statistical analysis included Kaplan-Meier survival analysis for disease-free (DFS) and overall survivals (OS), and univariate analyses to assess each prognostic factor separately using SPSS 16.0 for windows. Results: Most common tumor location was upper outer quadrant and most common histology was infiltrating duct carcinoma. Median age was 45 years. Eighteen patients received preoperative chemotherapy to conserve the breast. Pathological complete response (pCR) in this subgroup was 39%. Majority had node negative disease and 42 tumors were hormone receptor positive. Median follow-up was 49 months. Two patients developed isolated local recurrences which were salvaged surgically. Seven patients had systemic disease of which 5 had simultaneously failed locally. Overall 5-year DFS was 89 %. Conclusions: When given an option, patients with breast cancer do desire to conserve their breast.Item Breeding habitats & seasonal variation in the larval density of Aedes aegypti (L) & Ae. albopictus (Skuse) in an urban garden in Calcutta city.(1999-06-24) Ray, S; Tandon, NA longitudinal study on the breeding habitats and variation in the relative larval density of Ae. aegypti and Ae. albopictus was conducted in an urban garden in Calcutta city. The observations of the study, during October 1995 to September 1996 revealed that both the species showed preference for breeding in earthen, and cement pots, plant pots, chowbachhas and molluscan shells. Ae. albopictus larvae were also found in accumulations of water in bamboo stumps and tree holes. The container positivity and relative larval density of both species was highest during monsoon (June 1996-September 1996) and lowest during summer (February 1996-May 1996). The seasonal variation in container index (CI) of each species was statistically significant (P < 0.05) and showed a positive correlation with rainfall, the seasonal variation in the larval density of both Ae. aegypti and Ae. albopictus in permanent breeding sites was however not statistically significant, indicating that the CI and relative larval density of the two species was unaffected by temperature and humidity. The variation between the larval density and their CI in the same season was not significant, suggesting a perfect adaptation of Ae. aegypti, an urban, and Ae. albopictus, a sylvatic species, to more or less similar aquatic biotypes in an urban garden.Item Breeding habitats and larval indices of Aedes aegypti and Ae. albopictus in the residential areas of Calcutta City.(2000-09-16) Tandon, N; Ray, SAedes aegypti and Ae. albopictus larvae were found breeding in almost all indoor and outdoor, temporary and/or permanent collections of water, either alone or in association with each other in residential areas of the city, the former throughout the year (June'97-May'98) and the latter during monsoons and post-monsoons only. Ae. aegypti showed preference for breeding in chowbachhas, indoors and Ae. albopictus for collections of water in flower pots and discarded containers and outdoors. The larval indices of both the species were highest during monsoons and post-monsoons.Item Centchroman--a post-coital contraceptive agent.(1977-12-01) Anand, N; Ray, SItem Characterization of DNA polymerase-alpha/primase complex from developing embryonic chicken brains.(1994-08-01) Ray, S; Kelley, T J; Fan, L; Basu, SDNA polymerase-alpha and primase activities present in a complex, have been isolated, partially purified, and characterized from embryonic chicken brain. DNA polymerase-alpha activity, characterized by its sensitivity to N-ethyl-maleimide, high sedimentation coefficient (11.3 S), and acidic isoelectric point (5-5.5) was found in all embryonic ages. Primase activity, the enzyme responsible for the initiation of DNA synthesis, co-sedimented with DNA polymerase-alpha activity on a continuous glycerol velocity gradient. A complex containing both DNA polymerase-alpha and primase activities was isolated by DE-23 cellulose column chromatography of cell-free extracts of different embryonic ages of chicken brain. In addition to the primase complexed with DNA polymerase-alpha, a free primase activity was isolated by DE-23 cellulose column chromatography of an ammonium sulfate (0-45%; w/v) precipitated fraction of embryonic chicken brain cell-free extract. DNA polymerase-alpha activity from developing chicken brains in the embryonic stage was purified by immuno-affinity column chromatography. Of all the single-stranded DNA templates tested, primase activity was found to be maximally active with poly dC. Primase activity was not inhibited by a high concentration of alpha-amanitin. The results obtained may provide insight into further understanding of regulation of chromosomal DNA replication in developing tissues.Item Clinical, virological & serological studies on monkey after intravenous inoculation of virulent variola virus.(1970-04-01) Ray, S; Sarkar, J KItem Coronary arteriovenous fistula.(1996-02-01) Kar, A K; Chatterjee, A; Ray, S; Panja, MItem Coxsackievirus A24 variant EH 24/70 and enterovirus type 70 in an epidemic of acute haemorrhagic conjunctivitis--a preliminary report.(1977-05-01) Christopher, S; John, T J; Charles, V; Ray, SItem Cranial neuropathy and bone involvement in primary systemic amyloidosis.(2006-07-09) Ray, S; Pavithran, K; Nair, P SBone involvement in primary systemic amyloidosis is rare. Intracranial involvement in primary amyloidosis has not been reported so far. We report two cases of bone involvement in primary amyloidosis. The first patient also had combined deficiencies of factor IX and XII, while the second patient had associated intracranial involvement and XIIth cranial nerve palsy. Both these cases are unique in that, destructive bone lesions with intracranial involvement and combined factor deficiencies have not been reported in primary amyloidosis previously.Item Current understanding of pathogenesis of coronary artery disease and its future implications.(2000-11-27) Ray, S; Panja, MCoronary artery disease (CAD) is the most important cause of morbidity and mortality in a population. Percutaneous coronary intervention and coronary artery by-pass grafting have greatly changed the treatment of CAD, still many questions remain unanswered. Atherosclerosis is a normal consequence of ageing but some patients may experience it at an earlier age. As regarding pathogenesis of atherosclerosis, it is described often as a focal process which is diffuse in nature primarily involving the vessel intima. Salient features of 'lesion prone areas' in atherosclerosis include increased endothelial permeability to an intimal accumulation of plasma proteins, including albumin, fibronogen and LDL. The clinical expression of atherosclerotic disease activities is determined by pathologic events leading to coronary thrombosis. A vulnerable plaque has the characteristics of: Extracellular lipid pool occupies a large proportion of overall plaque volume, the fibrous cap which separates the lipid core from luminal blood is thinner within, and high macrophage density. Typically these plaques cause < 50% cross-sectional stenosis of the artery. The contribution of CAD is clearly of both genetic and environmental in origin. An increase in shedding of cell adhesion molecules may be a characteristic of atherosclerotic lesion. There is also suggestion that plasminogen activation inhibitor type I (PAI-1) has an important role in atherogenesis. Angiogenic growth factors and their endothelial receptors function as major regulators of blood vessel formation. Thereapeutic angiogenesis can be achieved by exogenously adding VEGF and/or other angiogenic growth factors.Item A cytohistological correlation in salivary gland swelling with special reference to the proposed Milan system(Indian Association of Pathologists and Microbiologists, 2019-09) Mishra, S; Ray, S; Sengupta, M; Sengupta, AContext and Background: Cytological grading of salivary gland lesion, which is a simple, cost-effective, and reproducible method, can be used as a tool for the selection of treatment modality. The proposed Milan classification establishes one guideline for reporting of salivary gland cytology and thus helps in individualized treatment and follow-up. Aims and Objectives: (1) The aims and objectives of this study were to establish the validity and reliability of the Milan classification of cytological grading in salivary gland swelling and (2) to calculate the malignancy risk. Materials and Methods: This prospective study was designed in clinically diagnosed salivary gland swelling at the Department of Pathology of a tertiary care referral hospital. Fine-needle aspiration (FNA) was done, and stained smears were examined under light microscope and cytological findings were noted according to the Milan classification. Tissue for the histopathological study was obtained in 119 cases. The previous cytological findings were compared to subsequent histopathology report. Results: Among 119 FNAs, 2.5% were nondiagnostic and 55.4% were nonneoplastic. While no samples were placed in the atypia of undetermined significance category, benign tumors accounted for 25.2%. About 1.7% was grouped in the salivary gland neoplasm of uncertain malignant potential, 2.5% of cases were categorized as suspicious of malignancy, and 12.6% of cases comprised as malignant tumors. Overall, malignancy risk was observed to be the highest (93.3%) in Category 6 and lowest (3.0%) in nonneoplastic category. Conclusions: The six-tier diagnostic categories of the Milan classification scheme help in segregating patients with salivary gland lesions into the management categories of follow-up, conservative surgery, and radical surgery with/without chemotherapy.Item Detoxification of mercury and organomercurials by nitrogen-fixing soil bacteria.(1989-06) Ray, S; Gachhui, R; Pahan, K; Mandal, A; CHAUDHURY, JMinimal inhibitory concentration values of HgCl2 and 5 organomercurials were determined against 24 mercury-resistant N2-fixing soil bacteria previously isolated from soil and identified in our laboratory. These bacterial strains also displayed multiple antibiotic resistant properties. Typical growth pattern of a highly mercury-resistant Beijerinckia sp (KDr2) was studied in liquid broth supplemented with toxic levels of mercury compounds. Four bacterial strains were selected for determining their ability to volatilize mercury and their Hg-volatilizing capacity was different. Cell-free extracts prepared from overnight mercury-induced cells catalyzed Hg2+-induced NADPH oxidation. Specific activities of Hg2+-reductase which is capable of catalyzing conversion of Hg2+ →Ηg (o) of 10 Hg-resistant bacterial strains are also reported.Item Development of a mutant strain of Aspergillus niger and optimization of some physical factors for improved calcium gluconate production.(1994-12-01) Ray, S; Banik, A KIn the course of mutation studies of Aspergillus niger strain AB with ethylene imine (1:4000), a mutant A. niger AB 501, produced greater amount of calcium gluconate in the culture broth (88.0 g/lit) as against the parent strain (36.0 g/lit) by the surface culture method of fermentation. This mutant was then exposed to UV-rays and a mutant, A.niger AB 1801, was found to produce high calcium gluconate in the culture broth (120 g/lit). The optimum cultural conditions for the production of calcium gluconate by A.niger AB 1801 were pH, 6.5; period of incubation, 9 days; volume of medium in 1 litre flask, 150 ml; temperature, 30 degrees C, volume of inoculum, 7.5 ml of cell suspension containing 2.6 x 10(7) spores and age of inoculum, 6 days old spores of A. niger AB 1801. The maximum yield of calcium gluconate to the above conditions was 168 g/lit. The cultural conditions that support maximum cultural growth did not, however, give optimal yield of calcium gluconate because after having yielded the maximum of calcium gluconate the growth of organism continued to increase further.