Seasonal and diurnal changes of chlorophyll in a tropical fresh water impoundment

The phytoplankton biomass was estimated in terms of chlorophyll in Sathiar reservoir. The chlorophyll values were high during the low water phase in the reservoir which was also the period of summer. Following the rains and increase in water depth phytoplankton biomass decreases on account of (a) dilution, (b) loss from the reservoir through the outlets and (c) settling to the bottom along with silt. The diel variations of chlorophyll showed that the peak value was reached mostly at 12 noon due to the migration of phytoplankton to the surface.     

Genetic location ofrra mutation and its role in alleviation of rgl restriction

Restriction of glucosyl-free HMC-DNA mediated by RglB is alleviated inrecBC sbcA strains ofEscherichia coli K12. Mutation in the unlinkedrra gene reverses thisrecBC sbcA-mediated alleviation. The map position ofrra is 90.16 min on the standard map, and therra ⁺ gene product counteracts Rgl restriction. The activation of therra gene is controlled by thesbcA gene, and this regulation does not seem to require the involvement of other gene functions.     

Free radical theory of autoimmunity

Background  

Despite great advances in clinical oncology, the molecular mechanisms underlying the failure of chemotherapeutic intervention in treating lymphoproliferative and related disorders are not well understood.     

PknE, a serine/threonine protein kinase from Mycobacterium tuberculosis has a role in adaptive responses

Serine/threonine protein kinases (STPK) play a major role in the physiology and pathogenesis of Mycobacterium tuberculosis. Here, we have examined the role of pknE, a STPK in the adaptive responses of M. tuberculosis using a deletion mutant ΔpknE. The survival of ΔpknE was assessed in the presence of stress (pH, surfactant and cell wall–damaging agents) and anti-tuberculosis drugs. ΔpknE had a defective growth in pH 7.0 and lysozyme (a cell wall–damaging agent) with better survival in pH 5.5, SDS and kanamycin (a second-line anti-tuberculosis drug). Furthermore, ΔpknE was reduced in cell size during growth in liquid media and exhibited hypervirulence in a guinea pig model of infection. In conclusion, our data suggest that pknE plays a role in adaptive response of M. tuberculosis regulating cellular integrity and survival.     

Length-weight relationships of three Clupeiformes species from the Southeast coast of India,Bay of Bengal,Eastern Indian Ocean

This study deals with the length-weight relationships (LWRs) of three commercially important marine fishes belonging to the family Clupeidae from the major landing centers in Tuticorin, Mandapam, Thondi, Nagapattinam and Chennai in southeast coast of India. Monthly sampling were done at the respected landing centers from June, 2018 to April, 2019 from the commercial trawlers (with cod-end mesh size of 25–35 mm) and gill netters (with different mesh size vary from 20 to 170 mm). The estimated ‘b’ values ranged from 3.1215 (Sardinella albella) to 3.1819 (Amblygaster clupeoides) and ‘a’ values varied from 0.0059 (A. clupeoides) to 0.0074 (S. albella). The study also provides a new maximum total length (TL_max) for two species A. clupeoides and Sardinella fimbriata.     

Purification and characterization of a new protease inhibitor from Spatholobus parviflorus seeds which inhibits the larval gut proteases of Spodoptera mauritia (Boisduval) (Lepidoptera: Noctuidae)

Journal of Plant Biochemistry and Biotechnology - Plant protease inhibitors are defense molecules against pests, predators and pathogens. We purified and characterized a new 14 kDa...     

Decolorization of pulp and paper mill effluent by growth ofAspergillus niger

Pulp and paper mill effluent was decolorized by growth ofAspergillus niger. Adding glucose (2.0 g/l) and NH₄H₂PO₄ (1.0 g/l) improved decolorization by the fungus (leaving 19% of original colour) and reduced the BOD₅ (43%) and the COD (41%) of the effluent after 48 h of incubation.

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Résumé L'effluent d'un atelier de pâte à papier a été décoloré par la croissance d'Aspergillus niger. L'ajout de glucose (2.0 g/l) et de NH₄H₂PO₄ (1.0 g/l) a amélioré la décoloration de l'effluent par la molsissure, lalssant 19% de la couleur originale, réduisant la DBO₅ de 43% et la DCO de 41%, après 48 h d'incubation.

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This work was carried out at the Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore-641 003, India.