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The tumorigenicity of DNA from polyoma virus after cleavage with a variety of restriction enzymes was evaluated in suckling hamsters. Cleavage with enzymes that interrupt the region of the genome coding for the large tumor (T) antigen of polyoma virus markedly enhanced the tumorigenicity above that observed with DNA I of the virus. Cell lines established in vitro from tumors induced by polyoma virions, polyoma virus DNA I, or polyoma virus DNA that had been cleaved with restriction endonucleases in the early region all contain the polyoma virus middle and small T antigens but not the large T antigen of polyoma virus is not required for maintenance of the transformed state and probably not for initiation of tumorigenesis by viral DNA.
Interrupting the early region of polyoma virus DNA enhances tumorigenicity.
M A Israel, D T Simmons, S L Hourihan, W P Rowe, and M A Martin
The present study, deal about the antibiosis activity of soil bacteria, isolated from 10 different locations of rhizosphere and diverse cultivation at Kochi, Kerala, India. The bacteria were isolated by standard serial dilution plate techniques. Morphological characterization of the isolate was done by Gram’s staining and found that all of them gram positive. Isolated bacteria were tested against 6 human pathogens viz., Escherichia coli, Enterococcus sp., Pseudomonas aeruginosa, Klebsiella pneumoniae, Staphylococcus aureus and Acinetobacter sp. Primary screening was carried out by perpendicular streaking and seed overlay method. Based on the result of primary screening most potential isolates of S1A1 and S7A3 were selected for secondary screening. Both the isolates showed positive results against Enterococcus sp. and S.aureus. The maximum antagonistic activity of 20.98 and 27.08 mm zone of inhibition was recorded at S1A1 against Enterococcus sp. and S. aureus respectively, at 180 µl concentration. Molecular identification was carried out by 16S rRNA sequence. The 16S rRNA was amplified from the DNA samples by using PCR. The amplified 16S rRNA PCR products were purified and sequenced. The sequences were subjected to NCBI BLAST. The isolates S1A1 and S7A3 BLAST results showed 99% and 95% respectively, similarity with the available database sequence of Bacillus amyloliquefaciens. The sequences were deposited in GenBank and the accession numbers KY864390 (S1A1) and KY880975 (S7A3) were obtained.
Soil bacteria, Isolates, 16S rRNA, PCR
Antibacterial activity of soil bacteria isolated from Kochi, India and their molecular identification
Davis Gislin,a,b,⁎ Dorairaj Sudarsanam,a Gnanaprakasam Antony Raj,b and Kathirvelu Baskarb,⁎
A revision of the New Zealand endemic Lepidium oleraceum and allied species is presented. Sixteen species are recognised, 10 of these are new. The new species are segregated on the basis of morphological characters supported by molecular data obtained from three DNA markers (two rDNA and one cpDNA). One species, Lepidium castellanum sp. nov., is endemic to the Kermadec Islands where it is sympatric with Lepidium oleraceum. The North Island of New Zealand supports four species, with two of them, Lepidium amissum sp. nov. and Lepidium obtusatum, now extinct. The South Island supports six species, that, aside from Lepidium banksii, Lepidium flexicaule and Lepidium oleraceum, are all confined to the south-eastern half of the island (Lepidium aegrum sp. nov., Lepidium crassum sp. nov. and Lepidium juvencum sp. nov.). One of these, Lepidium juvencum sp. nov., extends to Stewart Island. The Chatham Islands support six species (Lepidium flexicaule, Lepidium oblitum sp. nov., Lepidium oleraceum, Lepidium oligodontum sp. nov., Lepidium panniforme sp. nov., and Lepidium rekohuense sp. nov.), one of which, Lepidium oligodontum sp. nov., extends to the Antipodes Islands group. The remote, subantarctic Bounty Islands group supports one endemic, Lepidium seditiosum sp. nov., which is the only vascular plant to be recorded from there. Lepidium limenophylax sp. nov. is known from islands off the south-western side of Stewart Island/Rakiura, The Snares and Auckland islands. Lepidium naufragorum, although not related to Lepidium oleraceum and its allies, is also treated because populations with entire leaves are now known. Typification is undertaken for Lepidium banksii, Lepidium oleraceum, Lepidium oleraceum var. acutidentatum, var. frondosum and var. serrulatum.
New Zealand Archipelago, Kermadec Islands, Brassicaceae, Lepidium, L. oleraceum group, new species, L. aegrum sp. nov., L. amissum sp. nov., L. castellanum sp. nov., L. crassum sp. nov., L. juvencum sp. nov., L. limenophylax sp. nov., L. oblitum sp. nov., L. oligodontum sp. nov., L. panniforme sp. nov., L. rekohuense sp. nov., L. seditiosum sp. nov., typifications, ecology, conservation
New Lepidium (Brassicaceae) from New Zealand
P. J. de Lange,1 P. B. Heenan,2 G. J. Houliston,3 J. R. Rolfe,4 and A. D. Mitchell5