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821.
822.
Swarms of the pardaliscid amphipod Halice hesmonectes were sampled at low-temperature hydrothermal vents in the Venture Hydrothermal Fields of the East Pacific Rise. In excess
of 3000 individuals were collected from a range of sites/habitats, and at two points in time (December 1991 and March 1994).
The structure of swarms was described in terms of growth stages, the development of primary and secondary sex characteristics
and the accumulation of nutritional reserves. The results demonstrated that swarms contained a wide range of growth stages,
but that small juveniles and mature males and females were absent. Swarm structure was interpreted as an equilibrium dependent
on the relative proportion of time spent by each growth stage in the swarm habitat. This equilibrium swarm structure was very
similar at different sites and times. Swarms dominated by small juveniles occurred at the northern sites in December 1991
following a period of eruption and new venting in April 1991. Equilibrium swarm structure had become re-established at these
sites by March 1994. The function of swarming was considered. The results indicated that swarming was not associated with
reproductive activity. The available evidence, though not conclusive, suggested that swarms were associated with feeding.
Received: 28 May 1999 / Accepted: 16 February 2000 相似文献
823.
824.
Diane Van Opstal Geerke M. Eggenhuizen Marieke Joosten Karin Diderich Lutgarde Govaerts Robert-Jan Galjaard Attie Go Maarten Knapen Marjan Boter Wai Y. Cheung Nicole van Koetsveld Stefanie van Veen Walter G. de Valk Fernanda Jehee Femke de Vries Iris Hollink Lies Hoefsloot Malgorzata Srebniak 《黑龙江环境通报》2020,40(10):1338-1342
825.
826.
827.
828.
Genome sequencing is increasingly being used to aid genetic diagnosis in fetuses with structural abnormalities detected on ultrasound examination. However, with clinical exome and genome sequencing, there is potential for the recognition and reporting of incidental or secondary findings unrelated to the indication for ordering the sequencing, but of potential medical value for patient care. In the postnatal setting, the American College of Medical Genetics and Genomics (ACMG) has clear guidelines that state that when offering sequencing, secondary findings should be reported in 59 genes for which ACMG consider there is a clinical evidence that pathogenic variants may result in disease that might be prevented or treated, with the option to opt out of receiving this information. However, these guidelines specifically exclude prenatal sequencing. Here, we report the debate on whether or not pathogenic findings in these 59 genes should or should not be reported in the prenatal setting. Although more were in favour of reporting before the debate, there was no significant consensus from the audience. After the debate there was a swing toward not reporting, but a slim majority (55%) remained in favour, indicating that this is an area requiring further research and the development of evidence-based guidelines applicable to prenatal proband and trio sequencing. 相似文献
829.
830.
Maria Neofytou Nathalie Brison Kris Van den Bogaert Luc Dehaspe Koen Devriendt Anja Geerts Joris R. Vermeesch 《黑龙江环境通报》2018,38(2):148-150
Noninvasive prenatal testing (NIPT) can very accurately determine fetal sex during pregnancy. We present an exceptional case where NIPT contradicts the ultrasound-based sex determination. The pregnant woman was recipient of a liver transplant from a male donor. Graft-derived cell-free DNA released into the maternal circulation clouded the NIPT-based sex determination. Hence, NIPT is not advisable when the pregnant mother underwent an organ transplant. 相似文献