| c band variation in polytene chromosomes of chironomus riparius (diptera, chironomidae) from a polluted piedmont station (italy). | c banding in polytene chromosomes of chironomus riparius from a santena polluted station of the river po, italy was described. a large variation in the appearance of c bands was established. the process involved the transformation of euchromatin into heterochromatin. activation of all chromosomes at telomeres was found. a structural modification of telomeric heterochromatin may exist. the centromeric heterochromatin was rarely observed. a high percentage of an amplification (88%) in arm f, b3h, ... | 1997 | 9547063 |
| effect of environmental pollution on the chromosomal variability of chironomus riparius meigen 1804 (diptera, chironomidae) larvae from two piedmont stations. | different frequencies of chromosomal alterations in salivary gland polytene chromosomes ab, cd and ef were described in larvae of chironomus riparius (syn. chironomus thummi) from the trace metal-polluted station of santena on the river banna, near turin, and from the unpolluted station of corio (40 km from turin) which was taken as a reference area. in a sample of 56 larvae from santena, no specimen with the standard karyotype in all cells of the salivary glands was found. different types of ab ... | 2000 | 11138945 |