Judul: Kualitas kokon hibrid ulat sutera (Bombyx mori L.) berdasarkan umur kokon
Abstrak: Cocoon l~arvestt ime significantly influenced the cocoon quality. Cocoon is harvested when the pupa is formed, the body becomes brown and h e skin is hard enough. The aim of this research was to investigate the influence of cocoon age on the cocoon quality and pupae complete fornl from two silkworn1 hybrids i.e. BS 07 and BS 10, and each hybrid differed by sex. The research was done from 1" to March 3oth 2006. The data were collected from three days old up to six days old cocoon and was analyzed using repeated measures of variance and completely randomized design of factorial pattern 2x2 with 5 replications. If the trearment had significantly effect on the variable that measured, it was continued with Least Squares Means Method. The parameters observed in this research were cocoqn we ght, single shell weight, shell ratio 2nd the complete fo~mo f pupae. The result of this research indicated significantly effect (Pi0,Ol) on cocoon weight, single shell weight and shell ratio and there was interaction among silkworm strain, scx and cocoon age. Cocoon weight, single shell weight and shell ratio were decline from three days old to four days old cocoon. Cocoon weight was decrease at four days old to six days old cocoon, but single shell weight and shell ratio were constant. Mortality between 5 to 10% from thee d;ys old up to six days old cocoon. Keywords: Silkworm, cocoon quality, pupac agc
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Judul: The Growth of Silkworm ( Bombyx mori L. ) New Hybrid and Commersial's Type
Abstrak: Silkworm larvae has a silk gland that produces silk threads. Silk thread quality is obtained from a qualified cocoon. Clean cocoons with no stains and have a strong fiber will havea high value. To attain qualified cocoons then the larvae feed consumption must be taken into account. The feed consumed will affect the growth performances such as body weight and body weight gain which are the most decisive indicator of the quality of cocoon. This study aimed to evaluate the growth of new hybridobtained from reciprocal cross breeding system and commercial type. The Completely Randomized Design was used as the experimental design with six hybrids as the treatment, i.e. H1 (Mainland China rase 808♂ X Japan race 108 ♀), H2 (Mainland China race 903 ♂ X Japan race 806 ♀), H3(Japan race 903 ♀ X Mainland China race 806 ♂), H4 (Mainland China race 808 ♀ X Japan race 108 ♂), H5 (commercial silkworm C301), and H6 (commercial silkworm BS09). The data taken from 30 larvae hybrid each were analyzed by ANOVA (95%) and then by Tukey test. The results showed that H2 (Mainland China race 903 ♂ X Japan race 806 ♀) was superior hybrid than any hybrid based on the variables of feed consumption, body weight gain, feed conversion, and mortality.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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