Sciencia Acta Xaveriana

1 - 16

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.

23 - 29

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.

49 - 57

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.