Biomedical subjects

S N Mukherjee

Publications and source records attributed to S N Mukherjee.

12 recordsLinked to original sources

PubMed2006

A study for evaluation of contaminant transport characteristics through fine-grained soil.

Transport of soluble toxic substances through porous media lead to some significant geoenvironmental problems, for example, leachate migration from municipal and industrial solid waste resulting from unregulated disposal. Advection, dispersion, diffusion, and decay are reported to be the principal mechanisms in such phenomena. Geotechnical properties of the soil also play a significant role in this deterioration. In the present study, laboratory tests were conducted to formulate an appropriate method for assessment of migration of metal ions, such as nickel, through the soil. Relevant kinetic and process parameters, such as aquifer data, surface area, dielectric constant, pH of zero point charge (pHzpc), and permeability were also studied. One-dimensional mathematical modeling was used to describe the dynamics of the process. The present investigation was carried out at an ash pond site of a thermal power plant situated in West Bengal, India.

Environmental Monitoring↗

PubMed2003

Performance of Spodoptera litura Fabricius on different host plants: influence of nitrogen and total phenolics of plants and mid-gut esterase activity of the insect.

Five host plants [castor, Ricinus communis (Carolus Linnaeus); cotton, Gossypium hirsutm (Carolus Linnaeus); tomato, Lycopersicum esculentum (Philip Miller); mint, Mentha arvensis (Carolus Linnaeus) and cabbage, Brassica oleracea (Carolus Linnaeus)] belonging to different families were used to study the performance of the Asian armyworm, Spodoptera litura larvae. Highest consumption of food and dry weight gain was observed in larvae fed on castor. Mint did not support optimum larval growth because of low digestibility and low efficiency of conversion of digested food to body matter. Dry weight gain ranged from 26.64 mg on mint to 86.80 mg in castor. These differences tend to be related to nitrogen and total phenolics content of the leaf tissues; however, the most clear-cut correlation is an inverse one between the host plant preference and the ratio of total phenolics to nitrogen in the leaf tissues. Mid-gut esterase activity in larvae showed an increasing trend with the increase in total phenolics: nitrogen ratio in the test plants and the order of mid-gut esterase activity in larvae was mint > cabbage > cotton > tomato > castor.

Animals↗

PubMed1997

Laboratory screening of different Bacillus thuringiensis strains against certain lepidopteran pests and subsequent field evaluation on the pod boring pest complex of pigeonpea (Cajanus cajan).

Laboratory evaluation of different Bacillus thuringiensis subspecies revealed that B. thuringiensis subsp. kurstaki (NCIM 2514) at 10(8) spores/ml concentration caused more than 85% mortality to the neonate larvae of the lepidopteran insects Spodoptera litura (F.) and Phthorimaea operculella (Z.). This strain at 10(10) spores/ml concentration was effective against the major lepidopteran pests comprising the pod boring complex of pigeonpea (Cajanus cajan), viz. Helicoverpa armigera (H.) and Exelastia atomosa (W.) under the field trials. Total grain yield from this treatment was least 1.5 times more than the untreated control.

Animals↗

PubMed1993

An apparatus for the experimental demonstration of behavioural responses of the cyclopoid copepod, Mesocyclops leuckarti sensu lato to light and temperature.

To demonstrate the behavioural responses of Mesocyclops leuckarti sensu lato to light and temperature, an apparatus was designed and fabricated. It was found that light did not effect the orientational response significantly (p > 0.05) compared to the control. However, temperature gradient definitely influenced the orientational response (p < 0.05). The suitability of this apparatus for studying the behavioural response of other aquatic organisms are also discussed.

Animals↗

PubMed1990

Effect of azadirachtin on Mesocyclops leuckarti sensu lato, vector of dracunculiasis.

Extension or otherwise of characteristic insect development inhibitory effects of the neem sesquiterpenoid azadirachtin have been examined on eggs and nauplii of the crustacean cyclops, M. leuckarti sensu lato, a major vector of guineaworm disease at 0.1 ppm and above doses. Azadirachtin reduced survival of early nauplii (N1 to N3) at 0.1 ppm and above doses. No such effect was observed when eggs and late nauplii (N4 to N5) were exposed. Azadirachtin did not affect the moult cycle when late nauplii (N4 to N5) were exposed continuously till adulthood. At all concentrations tested, adult cyclops exhibited normal mating.

Animals↗

PubMed1989