Critical electrolyte concentration of chromatin in polytene chromosomes of Trichosia pubescens (Diptera, Sciaridae)
نویسندگان
چکیده
منابع مشابه
Experimental induction of gene activity in the salivary gland chromosomes of Trichosia pubescens (Diptera: Sciaridae)
During the course of experiments with larvae of Trichosia pubescens, we have unexpectedly found that diethyl ether or chloroform anesthesia induces a large puff in a specific band in the polytene chromosomes of the salivary glands. This puff develops a few minutes after the treatment, attaining its maximum size after 60-100 min, and regresses completely 200 min after its activation. Through aut...
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Dipteran polytene chromosomes provide an excellent model for understanding in species complexes, as well as for structural and functional cytogenetics. The status of species in the Culex pipiens complex is controversial and the use of polytene chromosomes for cytogenetic analysis in the subfamily Culicinae has been difficult because of methodological problems. In this study, Malpighian tubule p...
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Wereport here a cytogenetic analysis of themelonßy,Bactrocera cucurbitae, Coquillett (Diptera: Tephritidae), a species of signiÞcant agricultural importance. The mitotic karyotype and detailed photographic maps of the larval salivary gland polytene chromosomes of the species are presented. The mitotic karyotype consists of six pairs of chromosomes including one pair of heteromorphic sex (XX/XY)...
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Locations of Z-DNA in polytene chromosomes
In polytene chromosomes of Drosophila hydei and D. melanogaster, Z-DNA was identified in varying distribution after different conditions for fixation were used. When salivary glands were fixed and squashed in 50% acetic acid alone, Z-DNA was found in the less dense DNA regions, such as interbands, some puffs, and a few of the less dense bands. Prefixation that combined ethanol and acetic acid e...
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ژورنال
عنوان ژورنال: Genetics and Molecular Biology
سال: 1998
ISSN: 1415-4757
DOI: 10.1590/s1415-47571998000200003