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Biomedical subjects

D Biswas

Publications and source records attributed to D Biswas.

At least 55 records · Page 3Linked to original sources
PubMed1993

Observations on the breeding habitats of Aedes aegypti in Calcutta following an episode of dengue haemorrhagic fever.

A year-long (Nov. 1990-Oct. 1991) search for Ae. aegypti larvae was made of all water containers in and around fixed 100 houses at Bowbazar area in Calcutta following an episode of DHF. Out of 10151 containers searched, 615 (6%) were positive. Masonry tanks were the major (64.2%) and preferred (17%) breeding sites of Ae. aegypti. Indoor containers (6.7%) were more conducive to breeding of the vector species than the outdoor ones (3%). Breteau index showing wide variation (25 in December '90 to '93 in August 1991) proved to be the best for measurement of density of larval population of Ae. aegypti and paralleled the fluctuation in both rainfall and humidity. Role of temperature was not pronounced. It was noted that cases of DHF occurred even with the lowest Breteau index in December.

Aedes↗
PubMed1992

A 4-kilobase congo red binding plasmid DNA fragment of Shigella dysenteriae 1 suppresses the growth and cell differentiation in Escherichia coli.

A 4-kilobase congo red binding plasmid DNA fragment of pCAT 120 of Shigella dysenteriae 1 was transferred to an Escherichia coli K12 strain by transformation. Transformants were unable to grow in any liquid broth medium. Electron microscopic studies revealed that the transformants grown on tryptic soy agar were associated in clusters after cell division. Normal cell separation among the transformants in comparison with recipient E. coli K12 was only observed when the growth medium was supplemented with sterile culture filtrate of the recipient strain. An unknown factor(s) required for cell separation located on the chromosome was suppressed by a 4-kb congo red binding plasmid DNA (pCAT 120) fragment of S. dysenteriae 1.

Cell Division↗