Working as Assistant Professor, Department of Zoology, Durgapur Government College. Interested in mosquito vector control, nanoparticles. Phone: 09434383341 Address: Department of Zoology Durgapur Government College J.N. Avenue, Durgapur Paschim Bardhaman, West Bengal PIN-713214
Abstract A cytochemical technique is established for assessment of succinic dehydrogenase activit... more Abstract A cytochemical technique is established for assessment of succinic dehydrogenase activity separately with Nitro-BT and 2,3,5-triphenyl tetrazolium chloride in different parts of cells, keeping the cellular morphology intact.
SUMMARY 1. When the state of the thyroid is classified as euthyroid or hyperthyroid from a previo... more SUMMARY 1. When the state of the thyroid is classified as euthyroid or hyperthyroid from a previous estimation of clinical symptoms, B.M.R. and plasma-bound iodine concentration (P.B.I.), there is no appreciable overlap in either the maximum uptake, the time to reach the maximum, or in the mean rate of iodine accumulation by the thyroid, during the first 3 hr following oral administration of 100 μc. 131I. 2. The line of demarcation between the hyperthyroid and the euthyroid lies at a maximum uptake of 40% of the administered dose or at a maximum average rate of accumulation of 6%/hr during the first 3 hr. 3. The rate of disappearance of iodine from the blood is not so sharply defined in the two groups. In the euthyroid group it varies from 8 to 19%/hr, while in the hyperthyroid it ranges between 16 and 34%/hr.
ABSTRACT Summary (1) A technique has been established for the determination of 32P uptake of the ... more ABSTRACT Summary (1) A technique has been established for the determination of 32P uptake of the average tumour cell. (2) A correlation was observed between nucleolar morphology, mitotic index and 32P uptake of an average tumour cell of a particular type of tumour. (3) All the above factors increased consistently from the benign tumour to adeno-carcinoma which retains some amount of differentiation in the form of persistent acinar space and finally to carcinoma simplex where the differentiation is minimum.
After prolonged use of the synthetic insecticides, novel insecticides of botanical origin are pre... more After prolonged use of the synthetic insecticides, novel insecticides of botanical origin are preferred for environment safety as well as human life. Present study was conducted to evaluate the larvicidal capability of Capparis zeylanica against Culex quinquefasciatus. Crude, cold and hot aqueous and ethyl acetate solvent extracts of foliages of C. zeylanica were tested against all instars larvae of Cx. quinquefasciatus. Lethal concentrations were determined. Effect on the non target water fauna was also tested. Cent percent mortality was found with 0.25% concentration of crude extracts against 1 st and 2 nd instar larvae. No larvicidal responses were found with cold and hot aqueous extracts. Highest mortality was found against 1 st and 2 nd instar larvae at 90 ppm concentration of ethyl acetate extracts at 72 h post exposure. Non-target populations were found non-responsive to active fraction. Secondary metabolites like Tannin, flavonoids and terpenoid were detected through prelimi...
International journal of pharma and bio sciences, 2015
Moringa oleifera (Lam.) is well known for wide range of medicinal activities and contribution to ... more Moringa oleifera (Lam.) is well known for wide range of medicinal activities and contribution to dietary diversity. The present study focused on investigating the antibacterial potentiality of the crude extract and different solvent extracts of the pods of M. oleifera using agar well diffusion method against pathogenic gram negative bacterial strains namely Pseudomonas fluorescens and Pseudomonas putida and gram positive bacterial strains namely Bacillus mycoides and Bacillus licheniformis. The best result was showed by Petroleum ether extract against the said bacteria. M.I.C. of the aforementioned extract on gram negative bacteria P. fluorescens and P. putida were found to be 28.6 µg/ml and 32.0 µg/ml respectively while 39 µg/ml and 42 µg/ml values were obtained for gram positive bacteria B. mycoides and B. licheniformis respectively. The petroleum ether extract of M. oleifera pods may act as a novel and effective antibacterial agent.
International journal of pharma and bio sciences, 2015
Vector control is the foremost step to diminish the mosquito borne diseases as the proper vaccina... more Vector control is the foremost step to diminish the mosquito borne diseases as the proper vaccinations are yet to develop against those obnoxious diseases. After many resistant cases, it is important to develop other sources of eco-friendly insecticides. The present piece of study was designed to evaluate the mosquito larvicidal efficacy of Operculina turpethum against malarial vector Anopheles stephensi. Hot and cold aqueous leaf extracts, and two different solvent extracts were treated against all the larval instars. LC50 and LC90 values were determined. Statistical justifications were made by log-probit, regression and ANOVA analyses. Cent percent mortality was found against 1 st instar larvae at a concentration of 0.5% hot aqueous and 160 ppm solvent extracts after 72 h of exposure. Non-target organisms were nonresponsive after treatment with the same. From the present study it can be concluded that the bioactive fractions from O. turpethum leave extracts have remarkable mosquit...
A long VA tachycardia during a typical atrioventricular nodal reentrant tachycardia (AVNRT) can b... more A long VA tachycardia during a typical atrioventricular nodal reentrant tachycardia (AVNRT) can be a concomitant atypical AVNRT, atrial tachycardia or rarely atrio-ventricular reentrant tachycardia (AVRT). There are reported associations of AVNRT with other tachycardia substrates. Maneuvers are useful for differentiating the mechanism of the second tachycardia. Atrial tachycardia (AT) is one common association. When the AT originates from the lower triangle of Koch/near coronary sinus ostium, it can mimic slow-slow/fast-slow AVNRT. We encountered an interesting case where a longer VA tachycardia got reproducibly induced when a critically timed atrial premature depolarisation was delivered on typical AVNRT. It was proved to be an AT. A slow pathway modification in the lower TOK was successful to eliminate both the tachycardia substrate.
Inadvertent direct atrial capture and pure his capture can result in variable findings during par... more Inadvertent direct atrial capture and pure his capture can result in variable findings during parahis pacing manoeuvre (PHP). Understanding the results and positioning the pacing bipole towards ventricular aspect (distal his region) is helpful to avoid ambiguous results during PHP.
Mosquitoes are very obnoxious insects and vectors of many diseases like malaria, filariasis, deng... more Mosquitoes are very obnoxious insects and vectors of many diseases like malaria, filariasis, dengue, yellow fever, encephalitis etc. Among these, malaria is transmitted by Anopheles stephensi mainly in urban areas across the temperate country. So, there is an imperative requirement to imply some mechanisms to reduce the mosquito vector to facilitate the reduction of vector borne diseases throughout the globe. But, mosquito control strategies are now in front of a threat because mosquito populations get resistance against the available synthetic insecticides. Besides the chemical insecticides, several other ways to control the vector population proved unsuccessful in most of the cases. Now, various researchers are trying to develop an alternate effective approach to eradicate malaria from the earth by controlling its vector by using a product which is ecofreindly, cost effective, biodegradable, non-toxic and selective in nature. So, by the amalgamation of the two fields namely the na...
Abstract A cytochemical technique is established for assessment of succinic dehydrogenase activit... more Abstract A cytochemical technique is established for assessment of succinic dehydrogenase activity separately with Nitro-BT and 2,3,5-triphenyl tetrazolium chloride in different parts of cells, keeping the cellular morphology intact.
SUMMARY 1. When the state of the thyroid is classified as euthyroid or hyperthyroid from a previo... more SUMMARY 1. When the state of the thyroid is classified as euthyroid or hyperthyroid from a previous estimation of clinical symptoms, B.M.R. and plasma-bound iodine concentration (P.B.I.), there is no appreciable overlap in either the maximum uptake, the time to reach the maximum, or in the mean rate of iodine accumulation by the thyroid, during the first 3 hr following oral administration of 100 μc. 131I. 2. The line of demarcation between the hyperthyroid and the euthyroid lies at a maximum uptake of 40% of the administered dose or at a maximum average rate of accumulation of 6%/hr during the first 3 hr. 3. The rate of disappearance of iodine from the blood is not so sharply defined in the two groups. In the euthyroid group it varies from 8 to 19%/hr, while in the hyperthyroid it ranges between 16 and 34%/hr.
ABSTRACT Summary (1) A technique has been established for the determination of 32P uptake of the ... more ABSTRACT Summary (1) A technique has been established for the determination of 32P uptake of the average tumour cell. (2) A correlation was observed between nucleolar morphology, mitotic index and 32P uptake of an average tumour cell of a particular type of tumour. (3) All the above factors increased consistently from the benign tumour to adeno-carcinoma which retains some amount of differentiation in the form of persistent acinar space and finally to carcinoma simplex where the differentiation is minimum.
After prolonged use of the synthetic insecticides, novel insecticides of botanical origin are pre... more After prolonged use of the synthetic insecticides, novel insecticides of botanical origin are preferred for environment safety as well as human life. Present study was conducted to evaluate the larvicidal capability of Capparis zeylanica against Culex quinquefasciatus. Crude, cold and hot aqueous and ethyl acetate solvent extracts of foliages of C. zeylanica were tested against all instars larvae of Cx. quinquefasciatus. Lethal concentrations were determined. Effect on the non target water fauna was also tested. Cent percent mortality was found with 0.25% concentration of crude extracts against 1 st and 2 nd instar larvae. No larvicidal responses were found with cold and hot aqueous extracts. Highest mortality was found against 1 st and 2 nd instar larvae at 90 ppm concentration of ethyl acetate extracts at 72 h post exposure. Non-target populations were found non-responsive to active fraction. Secondary metabolites like Tannin, flavonoids and terpenoid were detected through prelimi...
International journal of pharma and bio sciences, 2015
Moringa oleifera (Lam.) is well known for wide range of medicinal activities and contribution to ... more Moringa oleifera (Lam.) is well known for wide range of medicinal activities and contribution to dietary diversity. The present study focused on investigating the antibacterial potentiality of the crude extract and different solvent extracts of the pods of M. oleifera using agar well diffusion method against pathogenic gram negative bacterial strains namely Pseudomonas fluorescens and Pseudomonas putida and gram positive bacterial strains namely Bacillus mycoides and Bacillus licheniformis. The best result was showed by Petroleum ether extract against the said bacteria. M.I.C. of the aforementioned extract on gram negative bacteria P. fluorescens and P. putida were found to be 28.6 µg/ml and 32.0 µg/ml respectively while 39 µg/ml and 42 µg/ml values were obtained for gram positive bacteria B. mycoides and B. licheniformis respectively. The petroleum ether extract of M. oleifera pods may act as a novel and effective antibacterial agent.
International journal of pharma and bio sciences, 2015
Vector control is the foremost step to diminish the mosquito borne diseases as the proper vaccina... more Vector control is the foremost step to diminish the mosquito borne diseases as the proper vaccinations are yet to develop against those obnoxious diseases. After many resistant cases, it is important to develop other sources of eco-friendly insecticides. The present piece of study was designed to evaluate the mosquito larvicidal efficacy of Operculina turpethum against malarial vector Anopheles stephensi. Hot and cold aqueous leaf extracts, and two different solvent extracts were treated against all the larval instars. LC50 and LC90 values were determined. Statistical justifications were made by log-probit, regression and ANOVA analyses. Cent percent mortality was found against 1 st instar larvae at a concentration of 0.5% hot aqueous and 160 ppm solvent extracts after 72 h of exposure. Non-target organisms were nonresponsive after treatment with the same. From the present study it can be concluded that the bioactive fractions from O. turpethum leave extracts have remarkable mosquit...
A long VA tachycardia during a typical atrioventricular nodal reentrant tachycardia (AVNRT) can b... more A long VA tachycardia during a typical atrioventricular nodal reentrant tachycardia (AVNRT) can be a concomitant atypical AVNRT, atrial tachycardia or rarely atrio-ventricular reentrant tachycardia (AVRT). There are reported associations of AVNRT with other tachycardia substrates. Maneuvers are useful for differentiating the mechanism of the second tachycardia. Atrial tachycardia (AT) is one common association. When the AT originates from the lower triangle of Koch/near coronary sinus ostium, it can mimic slow-slow/fast-slow AVNRT. We encountered an interesting case where a longer VA tachycardia got reproducibly induced when a critically timed atrial premature depolarisation was delivered on typical AVNRT. It was proved to be an AT. A slow pathway modification in the lower TOK was successful to eliminate both the tachycardia substrate.
Inadvertent direct atrial capture and pure his capture can result in variable findings during par... more Inadvertent direct atrial capture and pure his capture can result in variable findings during parahis pacing manoeuvre (PHP). Understanding the results and positioning the pacing bipole towards ventricular aspect (distal his region) is helpful to avoid ambiguous results during PHP.
Mosquitoes are very obnoxious insects and vectors of many diseases like malaria, filariasis, deng... more Mosquitoes are very obnoxious insects and vectors of many diseases like malaria, filariasis, dengue, yellow fever, encephalitis etc. Among these, malaria is transmitted by Anopheles stephensi mainly in urban areas across the temperate country. So, there is an imperative requirement to imply some mechanisms to reduce the mosquito vector to facilitate the reduction of vector borne diseases throughout the globe. But, mosquito control strategies are now in front of a threat because mosquito populations get resistance against the available synthetic insecticides. Besides the chemical insecticides, several other ways to control the vector population proved unsuccessful in most of the cases. Now, various researchers are trying to develop an alternate effective approach to eradicate malaria from the earth by controlling its vector by using a product which is ecofreindly, cost effective, biodegradable, non-toxic and selective in nature. So, by the amalgamation of the two fields namely the na...
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Papers by Kuntal Bhattacharya