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Articles by M.K. Sinha
Total Records ( 7 ) for M.K. Sinha
  G. Lokesh , Putkho Paul Pao , K.N. Madhusudhan , P.K. Kar , A.K. Srivastava , M.K. Sinha , R. Manohar Reddy , P.M. Muniswamy Reddy and B.C. Prasad
  The wild silkworm, tropical tasar Antheraea mylitta Drury being mainly culturing in central and eastern parts of India and produces famous tasar silk. This insect species expresses divergent phenotypic characters in response to varying ecological and climatic conditions thus exists as ecoraces. Hence, in the present study, three ecoraces viz., Daba, Sukinda (Semi-domesticated) and Sarihan (wild) have been selected for the assessment of the variability in silk gland related traits. The parameters of the silk glands studied like comparative length, weight and silk gland to larval body mass index. Besides, some biochemical contents of the silk gland tissue were also studied in three ecoraces. The results showed significant variations at p<5% in all the parameters among the three ecoraces studied, also showed the sexual dimorphism in expression of silk gland features and economic traits. The semi-domesticated Daba ecorace showed higher performance in most of the parameters with comparatively greater in silk gland weight (22%) and in body mass index (>16%). Apart from this, wild ecorace Sarihan cocoons showed higher shell ratio (>10% over the value of other ecoraces). The study infers that, there is wide variability in the expression of phenotype with respect to silk gland related traits among the different ecoraces of tropical tasar silkworm A. mylitta. Since the silk glands are site of biosynthesis of silk proteins, these may be considered for the assessment of diversity or characterization of different ecoraces of tropical tasar silkworm.
  M.K. Sinha , B.R. Das , A. Srivastava and A.K. Saxena
  This research work reports on the influence of process parameters like voltage, spinning electrode speed, distance between electrodes and solution concentration on the morphology and tensile properties of electrospun nanofibrous PVA webs. The electrospinng spinning assignment is carried out with the commercially available Nanospinder machine. The morphological developments are explained on the basis of nanofibre diameter and web density as depicted by the FESEM images. The tensile properties are measured in terms of the mean tensile stress and Young’s modulus. The influence of individual parameters in isolation is studied herewith for assessing their individual influence and accordingly can be put together in order to control the process for proper development of nano webs morphology. The correlation of morphological developments and tensile properties is brought out for deciding the effective combination of process parameters in order to obtain stronger nanofibrous webs.
  R.M. Reddy , M.K. Sinha , K.P.K. Kumar , N.S. Gahlot , A.K. Srivastava , P.K. Kar and B.C. Prasad
  The aim of the present study is to explore hybridization influence to achieve the potential of silk yield and quality in commercial tasarculture, as against the current status of applying only a few wild and semi-domesticated ecoraces of Antheraea mylitta D to produce raw silk during commercial crop rearing season (September-December). The four F1 hybrid combinations generated using Daba, Jata and Raily tasar ecoraces of seed crop rearing season (July-August) were evaluated during commercial crop season of 2007 and 2008 for the influence of hybridization as positive heterosis in the traits of economically important silk productivity and filament denier. The F1 hybrid, Daba x Jata has recorded positive heterosis in single shell weight (+25.6%), total silk yield (+79.0%) and silk filament length (+68.1%), but for silk filament of high denier (11.98 d) followed by its reciprocal hybrid, JataxDaba in shell weight (+18.8%), silk yield (+68.1%), filament length (+63.8%) and filament of highest denier (12.32 d). Though, the RailyxDaba hybrid could show highest heterosis in shell weight (2.47 g) with filament of least denier (10.86 d), the improvement in filament length was marginal (+44.7%) and heterosis in silk yield was negative (-47.0%), while the performance of DabaxRaily hybrid was least among the hybrids. The study infers hybridization influence on silk related traits at F1 level as positive heterosis and the application feasibility of DabaxJata and JataxDaba hybrids during commercial crop rearing season for higher silk productivity with silk filament denier at least better than one of the parents of F1 hybrid combination.
  R. Manohar Reddy , M.K. Sinha and B.C. Prasad
  Though, India enjoys the availability and practice of mulberry, tasar (tropical/temperate), eri and muga silks, the utilization of tropical tasar seri-biodiversity, however requires appropriate breeding methods so to exploit the global demand of this vanya silk, besides reforming tribals, weaker sections and landless rural populace on economic front. Among the existing forty four ecoraces of Antheraea mylitta Drury, only Daba and Sukinda are commercially applied for cocoon production and want is in situ conservation and ex situ stabilization of additional ecoraces, particularly the Shorea robusta (sal) based, as amenable parental base for hybridization and silk production. The breeding for disease and adversity resistance, correlation among the trait(s) of commercial value as the tasar silkworm being an eco-insect reared outdoor and exploring the biotechnological tools for transgenic application appears pragmatic and worth. The management of genotype and environment interaction through multilocational breeding stations irrespective of rearing seasons applying compatible ecorace; breed or line(s) and involving the beneficiaries for their indigenous knowledge along with trained breeders is the indispensable strategy to achieve the tasar raw silk productivity and quality. The review has dealt with feasible breeding scenario of tasar silkworm in attaining the qualitative yield for the commercial sustenance of tropical tasarculture.
  Pardeep Bishnoi and M.K. Sinha
  This research validates the computational results regarding the effects of viscosity, the flow rate on the dynamics of drop formation in the continuous jetting mode with the experimental results available in the literature. In this research, volume of fluid method is used for tracking the droplet during detachment process. Various stages of drop formation including ejection and neck development of liquid thread and its breakoff into primary drops are studied. The deviation of pressure is also analyzed. The variation of the smallest width of thread and thread length is also studied for various time periods. It is also observed that the size of the primary drop increases slightly with the increase in surface tension and decreasing viscosity whereas while the effect of density on the size of the primary drop is negligible. Furthermore, mathematical models using power law, allometric curve and exponential decay function were also constructed. The coefficient of determination also achieved the higher values (0.97-0.99). Drop formation process is widely used in IC engines for atomization purposes in the paint industry and especially in the medical field for determining certain diseases.
  R. Manohar Reddy , Suresh Rai , A.K. Srivastava , P.K. Kar , M.K. Sinha and B.C. Prasad
  Assorted F1 hybrids and reciprocals of divergent tasar ecoraces of Antheraea mylitta viz., Daba, Jata and Raily were evaluated for relative heterosis. The DabaxJata [R] (random female and male) and its reciprocal hybrids have recorded high positive heterosis for fecundity (+17.45 and +1.70%), egg fertility (+11.58 and +7.20%), shell weight (+34.76 and +27.44%), silk ratio (+30.49 and +24.15%) and silk yields (+94.33 and +82.51%), respectively. Dabax Jata [PxS] (high pupal female and high shell male) hybrid, although recorded positive heterosis for all traits, but was next to random parental hybrids. The DabaxJata [PxP] (high pupal female and high pupal male) combination and its reciprocal have shown positive heterosis only for fecundity (+22.13 and +35.89%), while DabaxJata [SxS] (high shell female and high shell male) hybrid and its reciprocal are positive in shell weight (+45.12 and +33.54%) and silk ratios (+26.95 and 27.95%). All hybrids of DabaxRaily including reciprocals have shown negative heterosis for fecundity and silk yields. However, DabaxRaily [R], [SxS], [PxS] hybrids and their reciprocals have shown uneven positive heterosis for egg fertility (+1.65 to +20.74%), shell weight (+7.56 to +56.98%) and silk ratios (+1.02 to +54%). In general, all reciprocal F1 hybrids of Daba, Jata and Raily ecoraces have shown lesser heterosis. The dissimilar performance of assorted F1 hybrids and reciprocals of Daba, Jata and Raily ecoraces reveal their varied potential on relative heterosis. However, the study infers commercial prospective and optimal seed cocoon expediency in Daba and Jata ecoraces as F1 hybrids [R] and reciprocals. While, the trait specific positive heterosis in high pupal and high shell hybrids (assorted F1 hybrids) have application in segregating lines with desired traits and aggregating them in to needy one(s).
  R. Manohar Reddy , M.K. Sinha and B.C. Prasad
  In spite of huge availability of nature grown tropical tasar silkworm food plants and rural tribal man power, the tasarculture and raw silk production is yet to attain the potential. The reason being the inadequacy of prospective commercial silkworm seed and breed options, and the urgent need is a coherent application of existing parental races by effective selection. The global demand for vanya silks in general and tasar silk in particular, call-for sustainable utilization of country’s seri-biodiversity potential. Viability and productivity proportion of tasarculture in terms of seeds, cocoons and essentially raw silk, need attention for its vital role in reforming the livelihood and economic condition of rural, backward and tribal farmers. The conventional approaches on basic stock maintenance, commercial seed production, selective use of parental races or parents for heterosis and heterobeltiosis, method of backcrossing to exploit the traits of commercial importance and applying the advantage of GenotypexEnvironment (GxE) interactions are indispensable. In spite of current knowledge on sophisticated transgenic silkworm, appropriate application of on-hand parental resource material and methodologies can expedite tasar silk productivity improvement in addition to up-keep the agro based cottage industry’s cost-effectiveness and biodiversity conservation. The review deals with the current situation and probable strategies for enhancing the productivity and quality of tasar raw silk.
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