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Biomedical subjects

B Mody

Publications and source records attributed to B Mody.

9 recordsLinked to original sources

Age estimation using three established methods. A study on Indian population.

Age estimation is an important factor in the identification of an individual in forensic cases. Adult age determination from teeth was carried out using three methods, namely, Johanson method, methods of Kashyap and Koteswar Rao and the average stage of attrition method (ASA). A total of 100 patients were selected. Johanson and Kashyap method uses microscopic measurements, whereas ASA is purely a clinical method. ASA method was found to be the best method. Unsatisfactory results were seen more in Kashyap's technique. In all the three methods overestimates of age were common in mandibular teeth and in teeth taken from female individuals. More studies are needed in Kashyap's method as there are certain difficulties encountered in measuring a few criteria.

Adult↗

Cleavage of vasoactive intestinal peptide at multiple sites by autoantibodies.

Vasoactive intestinal peptide (VIP) fragments generated by autoantibodies purified from the blood of two human beings were separated and sequenced. Based on the identity of these fragments, seven peptide bonds cleaved by the antibodies were identified. Six of the seven scissile bonds are clustered in the region of VIP spanning residues 14-22 and were cleaved by antibodies from both human subjects. The seventh scissile bond is located at residues 7-8 and was cleaved by antibodies from one of the subjects. The scissile bonds link amino acid residues with different size, charge, and hydrophobicity. The hydrolytic activity of the antibodies was selective in that they failed to hydrolyze polypeptides unrelated in sequence to VIP (insulin and atrial natriuretic peptide). These observations demonstrate substrate specific hydrolysis by naturally occurring antibodies and expand the range of peptide bonds hydrolyzed by these antibodies.

Amino Acid Sequence↗

Vasoactive intestinal peptide hydrolysis by antibody light chains.

This paper describes evidence for hydrolysis of a neuropeptide, vasoactive intestinal peptide (VIP), by light chains purified from the IgG of a human subject positive for VIP binding antibodies. Purified IgG was digested with papain, resultant fragment antigen binding (Fab) fragments were reduced with 2-mercaptoethanol and alkylated with iodoacetamide, and light chains were purified by chromatography on immobilized antibodies to light chains and immobilized antibodies to heavy chains. Non-immunoglobulin components were undetectable in the light chain preparation, judged by sodium dodecyl sulfate-electrophoresis and Western blotting with anti-heavy and anti-light chain antibodies. The light chains hydrolyzed VIP with specific activity 32-fold greater than that of Fab, the pH optimum for light chain-mediated VIP hydrolysis was 7.0-7.5, and the hydrolytic activity was saturable (Vmax, 0.19 pmol/min/microgram light chains; substrate concentration at Vmax/2,380 nM).

Autoradiography↗

Damage to the plasma membrane in Escherichia coli K-12 induced by far-ultraviolet radiation and its repair.

Escherichia coli cells treated with low fluences of far-uv radiation (up to 90 J/m2) showed repairable damage to the plasma membrane. The loss of the ability of the cells to exclude citrate was evident from the respiratory stimulation of irradiated cells when citrate was provided exogenously. This loss of a barrier was a result of a structural disorganization of the plasma membrane as seen by freeze-etching electron microscopy. Analysis of the plasma membrane proteins by sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed a characteristic loss of certain membrane proteins. When irradiated cells were incubated in glucose minimal medium at 37 degrees C for various times, a gradual recovery of membrane structure and function was observed. The recovery process was inhibited in the absence of an energy source as well as protein synthesis. The majority of the recovery occurred in the initial 1 h of the postirradiation holding. These results demonstrated that far-uv radiation at a fluence less than the D10 value had a direct or indirect effect on plasma membrane proteins, causing their release from the membrane bilayer. The lost proteins were subsequently regained by de novo protein synthesis.

Cell Membrane↗

Total duodenal diversion for treatment of reflux esophagitis uncontrolled by repeated antireflux procedures.

The operations of Nissen, Hill, and Belsey are adequate in controlling esophaegeal reflux in the majority of patients. In a small percentage however, objective and subjective evidence of esophagitis persists in spite of repeated operations to restore lower esophageal sphincter competency. These failures are then usually treated by operative procedures of great magnitude involving organ interposition. Repeated antireflux operations directed to the gastroesophageal area may in some instances result in impairment of blood supply with an increased risk of both esophageal and gastric fistulae. In the past many observers have felt that reflux esophagitis resulted solely from the effects of acid-pepsin secretions bathing the distal esophagus. Recently experimental and clinical data have indicated the importance of duodenal contents in the etiology and perpetuation of reflux esophagitis. During a recent two year period, 6 patients with persistent reflux esophagitis uncontrolled by repeated antireflux procedures have been seen on our service. These 6 patients, underwent 12 unsuccessful antireflux operations elsewhere. Three of the 6 patients had also been subjected to vagotomy-antrectomy for a coexisting duodenal ulcer. A marked lowering of gastric acidity took place but esophageal reflux and esophagitis persisted. These three patients were treated on our service by takedown of the Billroth I anastomosis, closure of the duodenal stump and diversion of the duodenal contents into a Roux-en-Y limb. Three other patients who had undergone unsuccessful antireflux procedures alone were subjected to antral resection, Roux-en-Y diversion and transthoracid vagotomy. This simplified appraoch to the treatment of persistent esophageal reflux uncontrolled by repeated antireflux procedures has given satisfactory results. The operation should be considered when technical considerations preclude further surgical attempts to perform another effective antireflux operation. Total duodenal diversion should, however, not be considered as the primary operation for the patient suffering from reflux esophagitis. However, in circumstances discussed above this direct approach appears preferable to major resectional procedures.

Adult↗

Acute perforated duodenal ulcer. An evaluation of surgical management.

The surgical management of acute perforated duodenal ulcer has been evaluated in 360 patients. Simple closure was done in 254 patients, with a mortality of 6.7%, a morbidity of 21%, and an average hospital stay of 11.9 days. In 106 patients (29%) who underwent definitive operation for treatment of duodenal ulcer disease at time of perforation, the mortality was 2.8%, the morbidity was 15%, and the average hospital stay was nine days. Follow-up studies of simple closure in patients with no previous ulcer symptoms showed that 72% of the patients remained asymptomatic; in patients with previous ulcer symptoms, only 23% were asymptomatic. Definitive operation for acute perforation is indicated in good-risk patients who have a history of ulcers. Parietal cell vagotomy and simple closure was used in four patients with excellent early results.

Adult↗