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Biomedical subjects

S N Chatterjee

Publications and source records attributed to S N Chatterjee.

At least 55 records · Page 3Linked to original sources
PubMed1989

Furazolidone-induced interstrand cross-links in Vibrio cholerae DNA. Study of conformational change by circular dichroism.

Vibrio cholerae DNA bearing furazolidone-induced interstand cross-links show a change in the characteristic circular dichroism spectra of the DNA itself in dilute buffer. The change in c.d. spectra was characterized by a shift of the positive band around 272 nm to lower wavelength and a loss of ellipticity of the negative band around 242 nm, and is similar to that exhibited by mitomycin linked Vibrio cholerae DNA under identical conditions and is suggestive of a conformational change of DNA bearing such cross-links. Both furazolidone-induced and mitomycin-induced cross-linking of Vibrio cholerae DNA inhibited the salt-induced conformation change, i.e. increase in winding angle of DNA, the percentage inhibition being greater for mitomycin-linked DNA.

Buffers↗
PubMed1989

Observations on human bone-marrow for Leishmania donovani.

During the recent epidemic in North Bihar, a total of 65 cases which were clinically designated as Kala-azar had been subjected to bone-marrow aspiration from the iliac crest, out of which the L.D. body was demonstrated in 55 cases (84.61 per cent). Culture analysis of bone-marrow on modified Tobie's medium, revealed that ten cases (15.39 per cent) which were negative for L.D. body did not show any leptomonads, whereas out of 55 L.D. body positive cases, the promastigote forms developed in 22 cases (40.00 per cent). The probable reasons for the negative findings and also the age and sex distribution in Kala-azar are discussed in brief.

Adolescent↗
PubMed1988

Liposomes as membrane model for study of lipid peroxidation.

This article describes the properties, production and characterization of liposomes with special reference to their use as membrane model for the study of lipid peroxidation. It presents briefly the methods that can be used for the assay of liposomal lipid peroxidation and brings out the special advantages these liposomes provide in elucidating the mechanism of lipid peroxidation by different physical and chemical agents. Studies involving liposomal lipid peroxidation by different agents and the consequent changes in the structure and function of liposomal membrane have been reviewed briefly.

Animals↗
PubMed1988

Osteosarcoma.

Explore the source record for details and available documents.

Bone Neoplasms↗
PubMed1987

Ultraviolet inactivation and photoreactivation of the cholera phage 'kappa'.

The lysogenic cholera phage, 'Kappa' is some ten to twenty folds more resistant to UV (254 nm) than are most of the T. phages of E. coli, or the cholera phage PL 163/10, or the host V. cholerae strain H218 Smr, the 37% (D37) and 10% (D10) survival doses being 255.8 J/m2 and 633.6 J/m2 respectively. The UV-irradiated 'Kappa' phages could be photoreactivated in the host V. cholerae strain H218 Smr to a maximum extent of 40%. The removal of the number of lethal hits per phage by the survival-enhancement treatment (photoreactivation) with time followed an exponential relation, the constant probability of removal of lethal hit per unit time being 2.8 x 10(-2)min-1. The UV-irradiated phages could also be Weigle reactivated in the host strain H218 Smr by a small degree, the maximum reactivation factor (ratio of survivals in UV-irradiated and non-irradiated hosts) being 1.50.

Bacteriophages↗
PubMed1987

DNA damage by 5-nitro-2-furylacrylic acid, a nitrofuran derivative.

5-Nitro-2-furylacrylic acid (5-NFA) caused dose dependent inhibition of growth of Escherichia coli K-12 strain AB 2480 (uvr-, rec-), the 37% (D37) and 10% (D10) survival doses being 1.0 microgram/ml.h and 1.75 micrograms/ml.h, respectively. Although much higher doses of drug were required to achieve comparable inhibition of growth of E. coli strain 1157 (repair proficient), significant filamentation of these cells was produced by treatment with 1.0 microgram/ml 5-NFA for 4 hr. Ultraviolet absorption data and thermal chromatography through hydroxyapatite (HAP) column revealed that 5-NFA treatment of E. coli strain AB 2480 produced more than 80% of DNA reversibly bihelical due to the formation of interstrand cross-links and the initial part of the reaction obeyed a first order relation. 5-NFA also produced dose-dependent increase of prophage induction in E. coli strain GY 5027: envA, uvrB, ampA1, strA (lambda). The implications of the action of 5-NFA on DNA in relation to the induction of 'SOS' functions and carcinogenesis were discussed.

Acrylates↗
PubMed1987

Spontaneous release of malondialdehyde from ultraviolet light exposed liposomal membranes.

UV absorption spectroscopy revealed the presence of MDA with characteristic maximum at about 266 nm in the dialysate of the UV irradiated liposomal suspension. The amount of MDA released increased linearly with increasing UV dose. The fluorescence method for the assay of MDA was found nearly 1500-fold more sensitive than the TBA colour reaction method.

Kinetics↗
PubMed1986

Pulmonary infections. The Minnesota randomized prospective trial of cyclosporine vs azathioprine-antilymphocyte globulin for immunosuppression in renal allograft recipients.

Nineteen of 224 renal allograft recipients who were prospectively randomized to receive either cyclosporine (n = 117) or azathioprine sodium-antilymphocyte globulin (n = 107) for immunosuppression suffered from one period of pneumonia (14 azathioprine and five cyclosporine recipients); two recipients of azathioprine had two episodes. Four patients in the azathioprine group and one in the cyclosporine group died, for mortalities of 3.7% and 0.85%, respectively. The percentage of pneumonia-free patients at one year was 96.3% in the cyclosporine group while it was 90.8% in the azathioprine group. Nondiabetics, women, and recipients of grafts from living related donors were at a statistically lower risk of developing pneumonia when treated with cyclosporine. Viral (cytomegalovirus), fungal (Candida, Aspergillus), and multibacterial causes of pneumonia each occurred with a similar incidence.

Adult↗
PubMed1986

Ultrasonic radiation induced lipid peroxidation in liposomal membrane.

Ultrasonic radiation produced a dose dependent linear increase in lipid peroxidation (MDA formation) in the liposomal membrane. The yield of MDA was significantly inhibited by butylated hydroxytoluene (BHT), the antioxidant, sodium formate, the OH. radical scavenger, and EDTA, the metal ion chelator. Ascorbic acid at low concentration increased the ultrasonic induced MDA formation while high concentrations inhibited lipid peroxidation. A mechanism of ultrasound induced lipid peroxidation is suggested.

Ascorbic Acid↗
PubMed1985

Failure of B-cold lymphocytotoxins to enhance cadaveric renal allograft survival.

In a three-year period between January 1980 and December 1982, 242 consecutive cadaver transplant recipients in one center were tested before transplantation by cytotoxicity against a random panel of T and B lymphocytes at 5 degrees C and 37 degrees C incubation. They were also tested for HLA-A, B, and DR antigens. Kidney transplants were carried out with the primary objective of achieving a two-DR match. Kidney transplants were carried out only in the absence of T-warm positive cross-matches. All patients were followed for a minimum period of one year after transplant. There have been no exclusions, and all causes of failure, including death, have been counted as graft losses. Patients were stratified according to HLA-A, B, and DR matches and were also divided into high-antibody and low-antibody groups. The recipients with no antibodies had the best one-year graft survival (66%). Recipients with B-cold antibodies did not have enhanced one-year graft survival (51%). Recipients with B-warm antibodies did indifferently (56%). The worst results were seen in recipients who had pretransplant T-warm antibodies (42%) though the number of patients in this group was small.

B-Lymphocytes↗