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1.
By analyzing the progeny of crosses involving brown eye mutants and the wild types in two members of Drosophila nasuta subgroup namely D. n. nasuta and D. n. albomicans we could show that the mutant gene is recessive, located in the chromosome 2 and the alleles of this gene are present at
different loci. A study of fitness in the eye color mutants in comparison with the wild types revealed that D. n. nasuta mutant has higher viability at both 25 ± 1°C and ambient temperatures; while D. n. albomicans mutant has faster rate of development only at 25 ± 1°C. Quantitative analysis of eye pigments in the mutants revealed that
there is biosynthesis of both pteridines and xanthommatins unlike in bw/bw of D. melanogaster, where only xanthommatins are synthesized. In both the species, the pteridine quantities in mutants are similar; whereas
xanthommatin quantity in
is 10 times higher than that of
. Further, the F1 progeny of intraspecific crosses (wild type X mutant) are found to have high amounts of pteridine, even when compared with
parental wild type.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
2.
Fulzele Devanand P. Satdive Ramesh K. Pol B. B. 《Plant Cell, Tissue and Organ Culture》2002,69(3):285-288
Untransformed root cultures of Nothapodytes foetida were established from immature zygotic embryos on MS basal medium supplemented with different concentration of growth regulators. Alkaloid contents in untransformed root cultures showed that root elongation and growth regulators accompanied product synthesis. Basal medium supplemented with NAA and BA achieved maximum number of elongated roots. Maximum concentration of camptothecin (0.01% DW) and 9-methoxy camptothecin (0.0016% DW) were synthesised by untransformed root cultures incubated on MS medium supplemented with NAA (71.36 M) and BA (8.87 M). Culture medium containing NAA (71.36 M) and Kn (9.29 M) proliferated callus interspersed with roots which synthesised camptothecin (0.00017% DW) and 9-methoxy-camptothecin (0.000058% DW). 相似文献
3.
E. M. Tul'skaya G. M. Streshinskaya I. B. Naumova A. S. Shashkov L. P. Terekhova 《Archives of microbiology》1993,160(4):299-305
The cell-wall teichoic acids of Nocardiopsis dassonvillei IMRU 509T, IMRU 504 and IMRU 1250 and Nocardiopsis antarctius VKM Ac-836T have the same unique structure that has not heretofore been found in bacteria. The polymer is built of 10 to 13 repeating units:
相似文献
4.
The life history ofNephus reunioni, introduced from the Reunioni island has been studied. Optimum temperature for the development of the entomophagous insect
is 24–25°C. In this case the population has the highest survival at preimaginal stages, life duration of adults and reproductive
capacity. The rate of population growth was calculated by the formula:
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