• Title, Summary, Keyword: Bombyx mori L

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The Whitening Effect by Water Extracts of Bombyx Mori Linne (백강잠(Bombyx Mori Linne) 물추출물의 미백 효능)

  • Ann, Young-Hee;Choi, Jeung-Sook
    • Journal of the Korean Society of Fashion and Beauty
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    • v.4 no.4
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    • pp.81-86
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    • 2006
  • Numerous novel ingredients have been introduced for the hight functionality of whitening cosmetics. Tough the preliminary research, we have found water extracts Bombyx mori have high whitening efficacy. The results of the research for the whitening effect of Bombyx Mori L. are as follow 1. Bombyx Mori L. inhibited concentration dependently the generation of melanin increased by the stimulation of $\alpha$-MSH and protoporphyrin IX, and $IC_{50}$ value was 8.3, 9.2 ${\mu}M$ respectively. 2. Melanin increased by the stimulation of $\alpha$-MSH and protoporphyrin IX was five to seven times superior in the inhibiting effect, compared with kojic acid used as positive control group. 3. Bombyx Mori L. did not have a decolorizing effect on melanin already generated. 3. Bombyx Mori L. was observed to have toxicity of over 100 ${\mu}M$ for the mouse melanoma B16 cells. Therefore, These results suggest that water extracts of Bombyx mori have inhibitory activity against mushroom tyrosinase and inhibitory activity of melanin synthesis in B16 melanoma cells in vitro.

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Prevention of Diapause in Bivoltine Eggs of the Silkworm, Bombyx mori, L., through a Cross with the Race KS-10 as Male Parent

  • Mundkur, Rajendra;Murthy, Mallesha;Mahadevappa;Raghuraman, R.;Bongale, U.D.
    • International Journal of Industrial Entomology
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    • v.9 no.1
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    • pp.107-109
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    • 2004
  • The present investigation reports a phenomenon hitherto unknown in tropical sericulture, wherein dia-pause nature of bivoltine eggs is overcome through a cross with a non-diapausing race of silkworm, Bombyx mori, L. Eggs of bivoltine silkworm Bombyx mori, L. generally do not hatch under tropical conditions. To prevent diapause, they are subjected to acid treatment or low temperature hibernation scheduled. A race developed at KSSRDI is found to prevent the diapause nature of bivoltine eggs when crossed as male parent, without any acid treatment or hibernation schedule. This phenomenon is reported for the first time, being unique, opens up interesting area of research in silkworm genetics of commercial implications in the industry.

Effect of Mating Duration and Multiple Use of Male Moth on Reproductive Performance of Some Cross Breeds of Silkworm, Bombyx mori L.

  • Sarkar, Kunal;Mandal, Manmatha;Moorthy, Shanmugam Manthira
    • International Journal of Industrial Entomology
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    • v.19 no.2
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    • pp.215-219
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    • 2009
  • The effect of mating duration and multiple use of male on fecundity and fertility was investigated in the hybrids of Silkworm, Bombyx mori L. One hour to five hours of mating duration did not affect egg laying (fecundity) significantly, while fertilization affected significantly. Below 50% fertility was noticed when mating duration was reduced to below two hours. Similarly multiple use of male caused significant reduction in fertility but not fecundity. Till fourth mating no significant reduction in fertility was observed, thereafter fertility reduced considerably.

Intrinsic bent DNA colocalizes with the sequence involved in the Nd-sD mutation in the Bombyx mori fibroin light chain gene

  • Barbosa, Joice Felipes;Bravo, Juliana Pereira;Takeda, Karen Izumi;Zanatta, Daniela Bertolini;Silva, Jose Luis Da Conceicao;Balani, Valerio Americo;Fiorini, Adriana;Fernandez, Maria Aparecida
    • BMB Reports
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    • v.41 no.5
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    • pp.394-399
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    • 2008
  • Multiple sequence alignments of the Bombyx mori fibroin light chain gene (fib-L) from hybrids and from Chinese and Japanese strains demonstrated that 51.6% of the fib-L third intron is conserved. One of these conserved segments, 41 bp long, contains the sequence CGTTATTATACATATT, which is duplicated in the B. mori Nd-$s^D$ mutant. In the present work, electrophoretic mobility assays and computational analyses revealed a major peak of intrinsic bent DNA within the segment that undergoes breakage in the previously-described Nd-$s^D$ mutation. This result suggested that this intrinsically-curved region might mediate DNA cleavage and enhance recombination events in the third intron of the Bombyx mori fib-L gene.

Implications of Temperature and Humidity on Pupation Patterns in the Silkworm, Bombyx mori L.

  • Lakshminarayana, P.;Naik, S.Sankar;Reddy, N.Sivarami
    • International Journal of Industrial Entomology
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    • v.5 no.1
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    • pp.67-71
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    • 2002
  • The implications of temperature (25,30 and 35$^{\circ}C$) and relative humidity (60, 70 and 80%) on the pupation patterns were studied in the silkworm, Bombyx mori L. Larvae of two pure silkworm breeds, Pure Mysore (PM) and NB4D2 and their hybrid, PM ${\times}4 NB4D2 were reared under experimental conditions under natural day photoperiodic (LD 12: 12) condition. The three developmental marker events viz., larval ripening, pharate pupal formation and pupal formation occurred at or around the beginning of the photo-phase. The computed of mean vector (equation omitted), based on the circular statistics, also confirmed the above. However, the length of mean vector, r and the mean vector angular variance, s varied according to temperature and humidity conditions imposed; the variations being non-significant. Extreme temperature and humidity conditions, however, resulted in reduction in pupation rate (%) for PM and PM ${\times}4 NB4D2. On the other hand, in NB4D2 pupation percentage reduced below the economic level. The temperature and humidity together seems to exert synergic impact on the pupation rate at least in the silkworm Bombyx mori, L.

Mating Behaviour in Mulberry Silkworm, Bombyx mori (L.)

  • Saheb N. M. Biram;Singh Tribhuwan;Kalappa H. K.;Saratchandra B.
    • International Journal of Industrial Entomology
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    • v.10 no.2
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    • pp.87-94
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    • 2005
  • Mating is an essential behavioural social event in the life cycle of silkworm, Bombyx mori (L.) for the perpetuation of population. A number of intrinsic and extrinsic factors and events of significant importance are involved in successful mating and egg deposition by an adult silk moth which besides biochemical, physiological and environmental factors also includes attraction of reproductively competent male and female moth for mating, duration and frequency of mating, age of moth at the time of mating, reuse of male moth in the production of eggs etc. An attempt has been made in this review article to elucidate briefly the behaviour of male towards female moth after eclosion, impact of duration and frequency of mating on egg deposition and oviposition, reuse of mated male moth in the production of quality and quantity eggs etc. in the silk-worm, B. mori and its significance in silkworm seed production.

Studies on Analysis of Combining Ability in the Mulberry Silkworm, Bombyx mori L.

  • Singh, Ravindra;Rao, D.Raghavendra;Kariappa, B.K.;Premalatha, V.;Dandin, S.B.
    • International Journal of Industrial Entomology
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    • v.6 no.2
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    • pp.107-113
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    • 2003
  • Analysis of combining ability is a widely used biometrical tool to select promising parents and hybrids, to determine the kinds and relative magnitudes of genetic variability among hybrids as well as to forecast yield attributes in early breeding generations both in plants and animals. Various statistical approaches like Jinks and Hayman (1953), Griffing (1956), Kempthorne (1957) etc. have been extensively applied in plants. These approaches have also been tried in the mulberry silkworm, Bombyx mori L. In the present review, an attempt has been made to collect most of the studies carried out on combining ability in silkworm at one place and make it available to the scientists engaged in sericultural research.

Evaluation and Identification of Promising Bivoltine Hybrids of Silkworm, Bombyx mori L., for Monsoon and Spring Season of Uttar Pradesh

  • Jaiswal, Kamal;Goel, Rachna
    • International Journal of Industrial Entomology
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    • v.6 no.2
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    • pp.183-190
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    • 2003
  • An attempt was made to identify superior bivoltine silkworm hybrid suitable for monsoon and spring season of Uttar Pradesh. Breeds with superior cocoon characters and their more popularity in an area were major parameters on basis of which breeds from different regions were selected. Six bivoltine hybrids of silkworm (Bombyx mori L.) of different geographical regions were reared in monsoon (three hybrids) and spring season (three hybrids) during 2000-2002 i.e., for three years at Babasaheb Bhimrao Ambedkar University, Lucknow. Their performances were analyzed statistically for nine characters. The analysis made on a number of traits viz., hatching percentage, larval duration, pupation rate, yield /10000 larvae (by no.), yield /10000 larvae (by weight), cocoon weight, cocoon shell weight, cocoon shell ratio, showed the superiority of one bivoltine hybrid out of the three bivoltine hybrids studied in each season. $SH6{\times}{NB_4}{D_2}$ was found to be superior in major cocoon parameters in both the seasons i.e., monsoon and spring season of Uttar Pradesh.

Correlation Coefficient Studies on Certain Quantitative Traits in the Silkworm, Bombyx mori L.

  • Begum, A.Naseema;Yamamoto, T.
    • International Journal of Industrial Entomology
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    • v.5 no.1
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    • pp.44-52
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    • 2002
  • To understand the relationship among different quantitative traits, correlation studies were performed by utilizing eighty-eight inbred strains of silkworm, Bombyx mori L. on twelve economic characters. Analysis resulted in correlation of 5th instar period with total larval period (r = 0.7882), cocoon weight with shell weight (r = 0.8326), shell weight with shell ratio (r = 0.5067), shell ratio with raw silk % (r = 0.7570), raw silk % with filament length (r = 0.3490), filament size (denier) with reelability (r = 0.3193) and boil-off loss % (r = 0.2792). Negative correlation was observed among filament length with filament size (r = 0.7582) and reelability with boil-off loss % (r = -0.3236). Correlation of different quantitative characters for quality silk production is discussed.