Recurrent branch retinal vein occlusion with factor V leiden mutation.
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Factor V↗
Biomedical subjects
S Banik
Publications and source records attributed to S Banik.
Effect of microwave irradiated Methanosarcina barkeri DSM-804 on biomethanation.
Methanosarcina barkeri DSM-804, a methanogenic bacterium, when exposed to microwave radiation of frequencies ranging from 13.5 to 36.5 GHz, showed faster growth in comparison to the unirradiated bacterial culture. Methane concentration in the biogas generated from the irradiated culture was higher than that from unirradiated one, which was to 76.3% on the 15th day of incubation at a microwave radiation frequency of 31.5 GHz, 10 dbm power when irradiated for 2 h. Microscopic study of pure culture revealed that the cells of M. barkeri were more in number and their cell diameter was enlarged by 20%. Inoculation of the culture in a biogas digester containing a combination of jute waste and vegetable market waste as substrate increased the efficacy of biomethanation and reduced its lag phase significantly.
Biotechnology↗
Argon nanobubbles in Al(111): a photoemission study.
Two fundamental manifestations of Al conduction electron response to Ar atom core hole in the final state of photoemission have been studied in implanted Ar bubbles in Al(111). Ar 2p binding energy and the Doniach-Sunjić asymmetry of the core-level line shape vary systematically as functions of Ar+ implantation energy and number of ions bombarded (fluence). The observations are explained by relating the strength of Al conduction electron screening to the size of the Ar nanobubbles.
Journal Article↗
Bioeffects of microwave--a brief review.
Since the 18th century scientists have been intrigued by the interaction of electromagnetic fields (EMFs) and various life processes. Attention has been focussed on EMFs in different frequency ranges, of which microwave frequency range forms an important part. Microwaves are part of the electromagnetic spectrum and are considered to be that radiation ranging in frequency from 300 million cycles per second (300 MHz) to 300 billion cycles per second (300 GHz), which correspond to a wavelength range of 1 m down to 1 mm. This nonionising electromagnetic radiation is absorbed at molecular level and manifests as changes in vibrational energy of the molecules or heat (Microwaves irradiating the community, Hidden hazards, Bantan Books publisher, Australia, 1991). Identifying and evaluating the biological effects of microwaves have been complex and controversial. Because of the paucity of information on the mechanism of interaction between microwave and biological systems, there has been a persistent view in physical and engineering sciences, that microwave fields are incapable of inducing bioeffects other than by heating (Health Physics 61 (1991) 3). Of late, the nonthermal effects of microwaves on tissue responses are being documented (Physiol. Rev. 61 (1981) 435; Annals of New York Acad. Sci. 247 (1975) 232; J. Microwave Power 14 (1979) 351; Bioelectromagnetics 7 (1986a) 45; Bioelectromagnetics 7 (1986b) 315; Biologic Effects and Health Hazards of Microwave Radiation, Warsaw, Polish Medical Publication (1974) 289; Biologic Effects and Health hazards of the microwave Radiation, Warsaw, Polish Medical Publication (1974) 22; Multidisciplinory perspectives in event-related brain potential research, Washington DC, US Environmental Protection Agency, (1978) 444). The present article is an attempt to familiarise the reader with pertinent information regarding the effects, mainly athermal, of microwave irradiation on biologic systems, especially microorganisms.
Animals↗
Cadmium-induced alterations of hepatic lipid peroxidation, glutathione S-transferase activity and reduced glutathione level and their possible correlation with chromosomal aberration in mice: a time course study.
Cadmium, a heavy metal, has been found to possess a potent toxic effect on liver and bone marrow. In the present study, attempts were made to understand whether or not any correlation existed between hepatic lipid peroxidation, glutathione S-transferase activity, reduced glutathione level and chromosome aberrations, micronucleus and mitotic index in bone marrow cells of Balb/C male mice. Cadmium chloride (2.5 mg/kg b.wt.), when administered subcutaneously for 7 alternate days, exerted duration-dependent toxic effects on hepatic biochemical and cytogenetic parameters of bone marrow. A shorter time interval (5 days) elicited no significant alteration in the case of biochemical parameters, but with the advancement of time (i.e. after 10 and 15 days) lipid peroxidation showed 102% (p < 0.001) elevation and after 15 days, glutathione S-transferase activity and reduced glutathione level decreased by 35%, (p < 0.001) and 32% (p < 0.001), respectively, from the control values with concomitant elevation of chromosomal aberrations (30%) and micronucleus (2.32%) but the mitotic index was inhibited by 1.26%. The results of our study, provided evidence of cadmium-induced duration-dependent depression of GSH-mediated GST-catalysed detoxication capacity of the host and that this was presumably related to the induction of chromosomal aberrations. The clastogenic efficacy of this heavy metal was thus evident from the study.
Animals↗
Increase in the concentrations of brain serotonin and 5-hydroxyindoleacetic acid during growth of a transplanted murine lymphoma.
The concentrations of serotonin (5-HT) and its metabolite, 5-hydroxyindoleacetic acid (5-HIAA) were studied in discrete brain areas of mice bearing transplantable Dalton's lymphoma (DL). Marked rise in 5-HT level (p < 0.05) was observed in serotonin secreting cell rich area--raphe region--as well as in hypothalamus and caudate putamen. High 5-HT level in these discrete areas was maintained throughout the period of tumor growth. Appreciable increase in 5-HT concentration was also observed in midbrain at the late stage (day 15 post-transplantation) of tumor growth. Unlike 5-HT, there was little change in 5-HIAA levels at the early stage (day 7) of tumor growth, and this was followed by a fall in 5-HIAA level around day 10 post-transplantation. However, the concentration of this 5-HT metabolite increased considerably at the late phase of tumor proliferation. The results suggest a close relationship between serotonin level in discrete brain regions and growth of an experimental tumor in mice.
Animals↗
Alterations of brain serotonin during experimental tumor growth in mice.
Concentrations of serotonin (5-HT) and its metabolite 5-hydroxyindoleacetic acid (5-HIAA) were studied in discrete areas of brain and in large intestine of Swiss mice following transplantation of Sarcoma 180 (S 180) ascites tumor. Significant increase in 5-HT levels (2 to 3.5-fold over controls, P < 0.05) was observed in raphe region of the brain throughout the period of tumor growth. Concomitant increase, although of lesser magnitude, was recorded in raphe 5-HIAA content. 5-HT content of hypothalamus, mid brain and caudate putamen, on the other hand, remained relatively unaltered except for an increase at the advanced stage of the disease. While mid brain and hypothalamic 5-HIAA were elevated at the late stage, 5-HIAA values of caudate putamen were normal or slightly reduced during the progression of tumor. Both 5-HT and 5-HIAA levels of the large intestine showed an early decline followed by a modest increase at the late stages. Brain and plasma tryptophan levels were also elevated significantly (P < 0.05) in the tumor hosts. The results suggest a close relationship between increase in serotonin concentrations in the brain, particularly in raphe region, and the progression of S-180 tumor in mice.
Animals↗
Lymphocytic glomerulitis in an Ask-Upmark kidney.
Lymphocytic glomerulitis in the Ask-Upmark kidney is a rare phenomenon. A case is reported in which the majority of the lymphoid cell infiltrate within the glomeruli was demonstrated to be of T cell origin.
Adult↗
Granulocytic sarcoma of the cervix: an immunohistochemical, histochemical, and ultrastructural study.
Light microscopical and routine immunohistochemical studies of a cervical neoplasm in a 32 year old woman initially suggested a histiocytic lymphoma, but histochemical staining for chloroacetate esterase established the correct diagnosis. This was supported by electron microscopic findings. Eight months later the patient developed a granulocytic sarcoma in her left breast and haemotological features of acute myeloid leukaemia. Accurate initial diagnosis of granulocytic sarcoma in a non-leukaemic patient may reduce the risk of subsequent acute myeloid leukaemia if appropriate chemotherapy is begun in time.
Adult↗
Fibrocystic disease in the male breast.
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Adult↗
Sarcoidosis of the breast.
Sarcoid granulomata were found incidentally in the mammary lobules adjacent to an excised fibroadenoma in a case of sarcoidosis of the breast. The diagnosis of sarcoidosis was established by the radiological finding of bilateral hilar lymphadenopathy, raised concentrations of serum angiotensin converting enzyme and lysozyme, and, finally, by a positive Kveim test.
Adenofibroma↗
Non-Hodgkin's lymphoma arising in adenolymphoma--a report of two cases.
Two cases of follicle centre cell lymphoma, apparently arising within adenolymphomas of the parotid gland, are reported. These are discussed in relation to the histogenesis of adenolymphoma and their possible relationship to mucosa-associated lymphoid tissue.
Adenolymphoma↗
Adult nephroblastoma with glomerular intracapillary deposits of IgM in the contralateral kidney.
A 43-year-old man who presented with hematuria had a nephroblastoma in the right kidney. After nephrectomy the patient was treated with irradiation and chemotherapy. Despite the development of pulmonary metastases he remained reasonably well for several years. He died of metastatic disease 8 years after presentation. Histological study of the contralateral kidney at autopsy revealed intracapillary glomerular deposits of IgM.
Adult↗
An unusual variant of multiple endocrine neoplasia syndrome: a case report.
A case of multiple endocrine neoplasia syndrome (MEN) in a 57-year-old woman with multiple endocrine tumours involving the pancreas, parathyroid and thyroid glands is reported. An unusual feature was the presence of collision tumours in the pituitary and adrenal. In the pituitary there were adenomas and a meningioma whereas in the adrenal there was a carcinoma along with a myelolipoma. Such collision tumours in the pituitary and adrenal as components of MEN syndrome have not been previously described.
Adenoma↗
Possible role of pituitary in Mitomycin C induced inhibition of testicular steroidogenesis.
To find out the role of pituitary in Mitomycin C (MC) induced reduction of testicular steroidogenesis, MC was administered along with HCG and the testicular steroidogenic activity was assessed on the basis of different parameters which are directly and indirectly related to the rate of testicular steroid biogenesis. The results indicate that MC induced reduction in testicular steroidogenesis is not only due to its direct effect but suppression of pituitary gonadotrophin secretion may be one of the responsible factor.
3-Hydroxysteroid Dehydrogenases↗
Phosphate-solubilizing potentiality of the microorganisms capable of utilizing aluminium phosphate as a sole phosphate source.
Eight bacteria, each of the genus Bacillus, two actinomycetes, each of the genus Streptomyces, and six fungi, one each of the genus Penicillium and Chaetomium and four of the genus Aspergillus, were isolated on AlPO4-sucrose agar from a typical Indian lateritic soil (Typic Ochragualf). All of them were capable of solubilizing Ca3(PO4)2 to a higher degree than AlPO4. Bacillus subtilis (B-7655), LAB4, Bacillus sp., LAB5, Penicillium sp., LAF2, and Aspergillus spp., LAF3 and LAF4, were solubilizing Ca3(PO4)2 very efficiently, but AlPO4 to a lesser degree. Bacillus spp., LAB1, LAB2, LAB5, LAB6 and LAB7, Chaetomium nigricolor, LAF1, and Aspergillus spp., LAF5 and LAF6, were unable to bring detectable amounts of soluble phosphorus to solution from AlPO4. Except Chaetomium, all the other organisms produced free aliphatic organic acid in detectable amounts. The organic acids produced were oxalic, succinic, citric, and 2-keto gluconic acid. 2-Keto gluconic acid, singly and in combination with succinic or citric acid, accounted for higher solubilization. Amount of free organic acids in the growth medium was not directly correlated with phosphate solubilization.
Aluminum Compounds↗
Haemorrhagic breast infarction complicating anticoagulant therapy.
Haemorrhagic infarction of the breast induced by anticoagulant therapy is rare and has been infrequently reported in the literature. The following report illustrates such a case in which there was development of massive haemorrhagic infarction of the breast during treatment with nicoumalone for deep venous thrombosis after an operation for carcinoma of the colon.
Acenocoumarol↗
Effect of continuous light on the blood and urinary sugar levels in alloxan diabetic rats.
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Alloxan↗