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More S.V.,CSIR - National Chemical Laboratory | Khandelwal H.B.,CSIR - National Chemical Laboratory | Joseph M.A.,Central Silk Board | Laxman R.S.,CSIR - National Chemical Laboratory
Journal of Natural Fibers | Year: 2013

Degumming of Chinese bivoltine silk with alkaline proteases from various microbial sources was investigated and compared with commercial enzymes. Among the proteases tested, two fungal and two actinomycete proteases were promising, which showed weight loss similar to conventional method (19.58% to 21.78%). Conidiobolus brefeldianus and BOA-2 proteases were best enzymes, which showed weight loss similar to conventional method with low enzyme concentrations and in shorter time. No significant differences were found in tensile strength or elongation at break by enzymatic degumming indicating that there was no damage to the fiber. Scanning electron micrographs showed the sericin deposits were removed and the fibers were separated. © 2013 Copyright Taylor and Francis Group, LLC.

Vijayan K.,Central Silk Board | Chung M.-C.,Academia Sinica, Taiwan | Tsou C.-H.,Academia Sinica, Taiwan
Scientia Horticulturae | Year: 2012

Intragenomic variability is known to be present in multi-copy gene sequences of several plant species and causes severe problems on molecular phylogenetic analysis. Initial investigation revealed extensive presence of intragenomic variability in nrITS of Camellia. Detailed investigation using 20-30 sequences from each leaf sample of seven species of Camellia revealed considerable sequence variability in terms of Kimura pair-wise distance, nucleotide diversity and Tamura's D parameters. Fluorescence in situ hybridization (FISH) revealed the dispersion of rDNA loci into multiple chromosomes and a small percentage of species in Camellia were allotetraploids. The distribution of rDNA loci into nonhomologous chromosomes along with long generation period and incidence of the interspecific hybridization are considered the major reasons for the failure of complete homogenization of the nrITS repeats by concerted evolution in Camellia. Nevertheless, in the majority diploid species or in the dominant sequence types of the allotetraploids, nrITS sequence variability was not high enough to obliterate the phylogenetic signals. Thus, utilization of nrITS in the phylogeny of Camellia is still possible, if adequate care is taken. © 2012 Elsevier B.V.

Qadri S.M.H.,Central Sericultural Research and Training Institute | Kumaresan P.,Central Silk Board
Indian Silk | Year: 2013

In view of the need for effective and timely redressai of the technology related issues of the farmers and the snag in the extension machinery for obvious reasons on the other hand, participation by the private players has yielded desirable results. The present concept paper suggests expanding the role of the Chawki Rearing Centre as Sericulture Resource Centre, ensuring effective extension.

Kumaresan P.,Central Silk Board
Indian Silk | Year: 2013

The prices of silk in the domestic market depend on various factors viz., production of silk in the country, cost of production vis-à-vis cost of inputs of production, demand for silk, import of silk from China as also prices of consumer commodities. An empirical study made with the available data with regard to the trend in cost of production of cocoon in India vis-à-vis China, helps understand the comparative advantage/disadvantage of Indian sericulture.

Kumaresan P.,Central Silk Board | Qadri S.M.H.,Central Sericultural Research and Training Institute
Indian Journal of Sericulture | Year: 2012

The area under mulberry and raw silk production grew at healthy rates in major silk producing states as well as in the country as a whole during 1980s and earlier part of 1990s. However, the rate of growth in raw silk production decelerated after mid 1990s as a result of decline in mulberry area. Nonetheless, owing to the improved technologies developed and popularized in the field, the productivity levels were sustained over the period. Varying pattern and magnitude of instability in mulberry were recorded across the states. The area instability was observed as the major source of production instability in most of the major silk producing states.

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