Interracial hybridization experiments between D. n. nasuta and D. n. albomicana were made. During gametogenesis there was selective elimination of abnormal gametes in F1 females; hence, only normal gametes were produced. F1 males yielded both normal and abnormal gametes. Fertility tests on F2 and backcross progeny showed males are more often sterile than females. The implications of these findings are discussed.
Inversion polymorphism, including a total of 33 inverted gene orders, was studied in South Indian populations of D. nasuta nasuta. Of these, the X chromosome has one, chromosome 2 has 10, and chromosome 3 has 22 inversions. D. nasuta nasuta has simple, tandem, included, overlapping, and complex types of paracentrics in its polymorphic system. The phylogenetic considerations of these gene orders are discussed.
A nanoparticle preparation (PC@AgNPs), synthesized biogenically using Priva cordifolia leaf extract was found to possess quenching property of stable DPPH and ABTS in dose dependent manner. The PC@AgNPs showed well-established physicochemical stability with respect to temperature, P H and salinity. It showed a broad bactericidal effect against 10 pathogenic bacteria, notably Staphylococcus aureus, Escherichia coli, Shigella flexneri and Vibrio parahaemolyticus. Its non-toxicity up to 500 µg mL −1 concentration to peripheral blood mononuclear cells was recorded. However, its toxic effect against human lung carcinoma cells and human breast adenocarcinoma cell lines at a dose of 500 and 300 µg mL −1 respectively was clearly evident. The catalytic efficiency of PC@AgNPs was demonstrated in methylene blue and methyl orange dye degradation. The studies have suggested possible applications of PC@AgNPs in future biomedical, pharmaceutical, and environmental applications.
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