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Biomedical subjects

S K Mittal

Publications and source records attributed to S K Mittal.

At least 19 recordsLinked to original sources
PubMed1992

Sequence analysis of bovine adenovirus type 3 early region 3 and fibre protein genes.

The DNA sequences of the early region 3 (E3) and fibre protein genes of bovine adenovirus type 3 (BAd3) have been determined and the amino acid sequences predicted to be encoded by their open reading frames (ORFs) compared to those of the fibre and E3 proteins from other Ads. One of the BAd3-E3 proteins contains a region homologous to the 14.7K E3 protein of human Ad5 (HAd5). The putative BAd3 fibre protein contains a number of regions homologous to the HAd2 fibre protein sequence, but is predicted to be 244 amino acids longer owing to an increase in the number of repeating structural motifs of hydrophobic amino acid residues in the shaft region. Sequences to the left of the BAd3-E3 gene region contained the 3' end of another ORF with extensive identity with the hexon-associated protein precursor (pVIII) of HAd2. Like mouse Ad1 and canine Ad1, the BAd3 E3 gene is approximately 1.5 kb, about half the size of the E3 region of HAd2 and HAd5.

Adenoviridae↗
PubMed1992

Acute osteomyelitis: early diagnosis by ultrasonography.

A prospective study was carried out to evaluate the role of ultrasound in early detection of infections of bone. Presence of a hypoechoic collection adjacent to bone was considered highly suggestive of osteomyelitis whereas a hypoechoic collection away from the bone implied a soft tissue abscess. Cellulitis presented as increased subcutaneous thickness. Of the 31 patients clinically suspected to have osteomyelitis, and subjected to ultrasound, 25 were proven to be osteomyelitis at surgery or by subsequent radiological changes, 4 had soft tissue abscesses and the remaining 2 had cellulitis. Co-existent hip joint effusion was seen in 2 patients. It is felt that ultrasound is simple and non-invasive investigation, capable of detecting bone and soft tissue infections.

Acute Disease↗
PubMed1992

Clinical and epidemiological features of acute gastroenteritis caused by human rotavirus subgroups.

Rotavirus was detected in 44 (15.28%) of 288 hospitalised children suffering from gastroenteritis in Delhi over a period of one year. Of these 44 children, subgroup I and II rotaviruses were detected in 13 (29.55%) and 25 (56.82%) children respectively. Samples from 5 (11.36%) children did not react with either subgroup I or II monoclonal antibodies, indicating the presence of a third subgroup. Both subgroups I and II were detected in one (2.27%) case. The median ages of the children infected by subgroup I and II rotavirus were 7 and 12 months respectively. Rotavirus was more prevalent in boys than in girls. The peak of rotavirus infection was seen in the early winter months. The difference of maximum and minimum monthly temperatures correlated significantly (p less than 0.05) with the incidence of rotavirus infection. Subgroup II was the predominant group throughout the period of study and caused a significantly higher incidence of severe diarrhoea than did subgroup I.

Acute Disease↗
PubMed1991

Hemobilia in a child with liver abscess.

Hemobilia in children is rare and has so far been described only as a complication of blunt abdominal trauma. A case of hemobilia secondary to liver abscess treated successfully by selective arterial embolization is described. Hemobilia should be considered in any case of gastrointestinal hemorrhage before any operative intervention is undertaken.

Angiography↗
PubMed1991

Comparison of latex agglutination and polyacrylamide gel electrophoresis with enzyme linked immunosorbent assay for detecting human rotavirus in stool specimens.

One hundred and forty five stool samples from children below 2 years of age, hospitalized with diarrhea were tested for rotavirus antigen by enzyme linked immunosorbent assay (ELISA), latex agglutination test using commercially available kit Rotastat (Ranbaxy Diagnostic, India) and by polyacrylamide gel electrophoresis. Twenty eight samples were positive for the virus antigen by all the three assay systems. The sensitivity of latex agglutination (LA) and polyacrylamide gel electrophoresis (PAGE) was 91.4% (32/35) and 80% (28/35), respectively; the corresponding specificity was 98.18% (108/110) and 100% (110/110), respectively. Latex agglutination was the least complex, required the least amount of apparatus and provided a result within a short time. It showed a high specificity and a reasonable amount of sensitivity and the results correlated well with ELISA and PAGE.

Antigens, Viral↗
PubMed1991

Pyogenic meningitis: sonographic evaluation.

Forty infants with proven pyogenic meningitis were evaluated by real time cranial sonography. A spectrum of sonographic abnormalities was observed which included echogenic sulci, focal or diffuse increase in parenchymal echoes, ventriculitis, ventriculomegaly with or without aqueductal block, subdural collection, parenchymal infarcts, abscess and subdural empyema. There were two infants with normal sonogram while encephalomalacia was seen in another two patients. An excellent correlation was observed between clinical profile, cerebrospinal fluid biochemistry and sonographic findings.

Brain Abscess↗
PubMed1990

Identification of the gene homologous to HSV major DNA binding protein in the BHV-1 genome.

By means of Southern blot hybridisation using a cloned herpes simplex virus (HSV) major DNA binding protein (MDBP) gene as probe, the putative MDBP gene of BHV-1 was located within the Hind III G fragment which mapped between 0.352 and 0.381 map units of the BHV-1 genome. Moreover, an antiserum raised to HSV MDBP precipitated a 120kD polypeptide in a radio-immunoprecipitation test.

Animals↗
PubMed1989

Analysis of the bovine herpesvirus type 1 thymidine kinase (TK) gene from wild-type virus and TK-deficient mutants.

Five thymidine kinase (TK)-deficient mutants (B1 to B5) of bovine herpesvirus type 1 (BHV-1) were isolated by selection for resistance to the nucleotide analogue bromovinyldeoxyuridine. The genetic lesion in mutant B1 was localized in a 2.7 kb SalI-SalI subfragment (fTK2.7) which maps between 0.456 and 0.475 within the HindIII A fragment of the BHV-1 genome. The tk genes from wild-type and the TK-mutants B1 to B5 were cloned and sequenced using eight unique synthetic primers designed from a published sequence. The BHV-1 tk gene sequence for the strain 6660 contained some differences compared with that published previously for strain LA. Alignment of the predicted amino acid sequence of the BHV-1 TK polypeptide with different herpesvirus TKs revealed five strongly conserved regions and also identified putative functional relationships with other enzymes. Several interesting features were apparent in the tk gene sequences from the TK- mutants. The TK mutant B1 was a typical frameshift and chain termination mutant due to the deletion of a single base. The tk gene sequence of mutant B2 revealed the deletion of three bases resulting in the loss of valine at amino acid residue 174 of the TK polypeptide. The tk genes of mutants B3 to B5 contained an identical change of a single base addition resulting in frameshift and premature chain termination. In contrast to wild-type BHV-1, the TK-defective mutants were incapable of adsorbing TK-neutralizing antibodies from serum.

Amino Acid Sequence↗
PubMed1989

Upper gastrointestinal endoscopy in children.

Diagnostic and therapeutic upper gastrointestinal endoscopy was carried out among 200 children. The procedure proved useful in detecting causes of various upper gastrointestinal problems especially hematemesis and dysphagia. It was also helpful in early detection of esophageal varices in children with suspected portal hypertension. Duodenal biopsies could be obtained in all children being investigated for chronic diarrhea and proved helpful in diagnosing three cases of celiac disease. Fiberoptic endoscopy has a large role to play in pediatric practice and is largely a safe procedure.

Child↗