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71.
Nickolai A. Tchurikov Tatiana I. Gerasimova Terrell K. Johnson Nickolai I. Barbakar Alexander L. Kenzior Georgii P. Georgiev 《Molecular & general genetics : MGG》1989,219(1-2):241-248
We have cloned from the Oregon R strain of Drosophila melanogaster a 240 kb segment of DNA that contains the cut (ct) locus, and characterized the region for the presence of repetitive elements. Within this region at least five copies of the suffix element were detected, as well as several putatively novel mobile elements. A number of mutations obtained from the unstable ct
MR2 strain and its derivatives were mapped within the cut locus. Comparison between parental and daughter strains indicates that frequently two or more independent transposition events involving the cut locus occur simultaneously within a single germ cell, thus providing a molecular basis for the transposition explosion phenomenon. 相似文献
72.
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74.
Cut marks on the Bodo cranium: a case of prehistoric defleshing 总被引:1,自引:0,他引:1
T D White 《American journal of physical anthropology》1986,69(4):503-509
Cut marks were discovered on the Middle Pleistocene Bodo cranium from Ethiopia. The cut marks most closely resemble experimental damage caused by the application of stone tools to fresh bone. This discovery constitutes the earliest solid evidence for intentional defleshing of a human ancestor and offers new research avenues for the investigation of early hominid mortuary practices. 相似文献
75.
Needle surface area inCryptomeria japonica was measured using a newly proposed cut method. Sample needles of various lengths were taken from foliage shoots belonging
to various height layers of nine trees growing at three sites. Needles were cut into small pieces with a hand-made cutter
made of razor blades and washers. By measuring the circumference and thickness of each piece, its lateral area was calculated
and summed to give the total surface area of the needle. For estimating the surface area of a needle (s), two linear parameters of needle size termedy
n*
and /were proposed:y
n*
was the distance between the needle tip and the uppermost point of attachment of the needle to the shoot, whilel was the distance between the needle tip and the lowermost point of attachment. The power-form relationship betweens andl was superior to thes-y
n*
relationship, since the former did not differ significantly among shoots of different diameter. Based on thes-l relationship, the total surface area of a shoot was estimated from thel-census of the shoot. Specific leaf area of a shoot (SLA), defined as half of the shoot surface area divided by the dry weight of the shoot, decreased from 90 to 3 [cm2g(dry wt)−1] with the diameter of the woody tissue of the foliage shoot. 相似文献