Sciencia Acta Xaveriana

1 - 8

Authors: B. Nanjegowda, N. Mal Reddy

The authorized commercial bivoltine silkworm hybrid namely, CSR2 x CSR4 was chosen for the present study. The hybrid was subjected to different temperature and humidity treatments i.e., 25±1°C and RH 65±5% (control), 301C, with combinations of low relative humidity (RH 65±5%) and high RH ( 85±5%) at different stages during rearing and spinning of silkworm larvae. The larvae of after 3rd moult were subjected to different thermal and humidity stress till the assessment of cocoon traits. The comparative rearing performance clearly indicated that the deleterious effect of high temperature and high RH was more pronounced for the majority of traits such as survival, cocoon yield, shell weight, and shell percentage, reelability, filament length, raw silk percentage and filament size than other temperature and RH treatments. The characters can be improved by providing ideal environmental conditions even during spinning stage of larvae affected with high temperature and RH.

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Authors: PV. Madusoodhanan, M. Sharmina

Effect of NaCl on the growth of the Cyanobacteria Westiellopsis prolifica Janet has been studied. Growth was observed in different concentrations of NaCl ranging from 0.1 to 0.9M but, maximum growth, chlorophyll-a ,protein content and ammonia excreation was noted in 0.6 M NaCl.

61 - 72

Authors: D. Prem Anand, T. Kishore Kumar, S. Anbarasu, S. Pandi, S. Selva Kumar, P. Sagayaraj

See the attachment file.

81 - 90

Authors: D. Prem Anand, T. Kishore Kumar, S. Anbarasu, S. Pandi, S. Selva Kumar, P. Sagayaraj

A new organic nonlinear optical (NLO) crystal, Morpholin-4-ium 3 carboxy-2, 3-dihydroxypropanoate (M4CDP) was synthesized and good optical defect free single crystals of M4CDP were grown by slow evaporation solution growth method at room temperature for the first time. UV-Vis-NIR spectrum indicates that the crystal has a very good transmittance in the entire visible and near IR regions of the spectrum suggesting the suitability of the material for NLO applications. The absorbance of M4CDP was used to calculate the refractive index n, the extinction coefficient K and both the real r and imaginary i components of the dielectric constant. The TG trace reveals that the material has good thermal stability. Thermodynamic activation parameters were computed from the TG curve using Coats and Redfern and Non linear regression methods, which confirms second order kinetics.

97 - 102

Authors: P. Benjamin, Jeya Rathna Kumar, A. John De Britto, D. Herin Sheeba Graceli

Plants are the natural medicinal resources. The presence of bioactive compounds and secondary metabolites determined the medicinal values of the plants. The medicinal property of the plant denoted the presence of active compounds in it. The presence of maximum numbers of active compounds exhibit high medicinal values. Solanum species are medicinal herbs used for the treatment of diverse ailments (diabetes, cholera, bronchitis, high blood pressure) and as laxatives. S. nigrum, S. torvum, S. trilobatum, S. surattense and S. melongena are important medicinal plants. Many other Solanum species are also used for medicinal purposes. The medicinal uses and antibacterial activity of the Solanum species are mainly due to the presence of bioactive constituents in the plants. Hence, the present study was focused to screen and separate the bioactive antibacterial constituents from the methanol extracts of leaves of five Solanum species, S. nigrum, S. torvum, S. trilobatum, S. surattense and S. melongena using Thin Layer Chromatography (TLC). The chromatogram was observed under visible light, UV (365), UV (265) and Iodine chamber. Maximum numbers of bands were observed in leaves extracts of S. surattense.

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Authors: P. Santhanam, J. Siva Kumar, T. Siva Kumar

A total of 56 Actinomycetes strains were isolated from Indian western ghat’s soil and their antagonistic activities were tested against six human pathogenic bacteria viz, Escherichia coli, Staphylococcus aureus, Salmonella typhi, Shigella sp.,Klebsiella pneumonia and Bacillus subtilis. Out of 56 strains isolated, only ten strains (WGA2, WGA7, WGA12, WGA15, WGA19, WGA21, WG29, WGA31, WGA37, and WGA49) showed high antibacterial activity against all the tested human bacterial pathogens. Among these, only 5 effective antagonistic strains (WGA7, WGA15, WGA21, WGA37 and WGA49) were selected for mutation study by using physical (UV radiation) and chemical (NTG) mutation methods. After the mutations, antibacterial activity of the strains viz WGA15, WGA49 (UV treated) WGA37 (NTG treated) was increased, but the WGA37 UV treated strain showed a decreased antibacterial activity. All the five strains possess LL-DAP and all the strains contained glycine in their cell wall. Presence of LLdiaminopimelicacid indicates that the cell wall having chemo type–1. So the cell wall property of the genes was identified the Streptomycetes.

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Authors: R. Malathi, S. Ahmed John

Since plants posses mainly medicine properties, the present study was designed to evaluate the antibacterial activities and phytochemical profile of the extracts from leaves of thylaphora asthamatica leaves. The antimicrobial activity was performed by agar disc diffusion method against bacteria viz.Staphylococcus aureis, proteus mirabilis, klebsiella pneumoniae, salmonella typhi, E.coli and fungi aspergillus flavus, aspergellus niger, fusarium. The methanolic extract of leaves of T.asthamatica showed maximum activity than chloroform and aqueous extract. This shows that the plant can be used for medicnal purpose.

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Authors: K. A. Hashim, V. Sobha, P. Pournami, S. Santhosh

Vembanadu Lake is the largest backwater systems of the Kerala State. The present study was carried out to evaluate the heavy metal contents from six different stations. Observations revealed that the heavy metal contents in some stations of this backwater system are beyond the standard limit.

73 - 82

Authors: A. Lourdusamy, P. Annammal, T. Nicholas

Let G = (V;E) be a graph with jVj = p and jEj = q. A total labeling l : V [E !f1;2; : : : ; p+qg is a bijection. The weight l : V [E !N is a function induced by l such that l (v) = l(v)+åx v l(vx) and l (e) = l(u)+l(v)+l(e), where e = uv. If l (v) is a constant for all v 2 V, then G is called vertex-magic. If l (e) is a constant for all e 2 E, then G is said to be edge magic. If G is both vertex magic and edge magic, G is called a totally magic graph. In this paper, we define path magic graphs and prove that any star graph is path magic. We also prove that totally magic graphs are path magic, but not the converse.