共查询到20条相似文献,搜索用时 375 毫秒
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J R Udry 《Journal of biosocial science》1979,11(4):433-441
Data from an urban sample of American women of reproductive ages demonstrate that age at menarche is correlated with age at first intercourse, that age at first intercourse is correlated with age at first pregnancy, and that menarche is therefore correlated with age at first pregnancy. This applied to both blacks and whites when examined for the early years of the reproductive cycle. Girls with early menarche, compared to those with late menarche, are more than twice as likely to have had intercourse by age 16, and almost twice as likely to have given birth or had a pregnancy terminated by age 18. It is therefore useful to think of the timing of menarche as an indicator of the probability of early intercourse and early childbearing. 相似文献
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《Fly》2013,7(3):139-141
On August 1, 2006 the Howard Hughes Medical Institute’s first stand-alone research campus opened at Janelia Farm, near Washington DC. Our mission at Janelia is to do exceptional fundamental research. Our two scientific foci are to understand the function of neural circuits and to develop synergistic imaging technologies. To achieve this we have changed many of the conventions of academic and/or industrial science. The founding director at Janelia is the well-known Drosophilist Gerry Rubin, who has been a central figure in fly molecular, developmental and genomic biology in recent decades. Not coincidentally, we at Janelia fully appreciate the potential of flies to contribute to an understanding of neuronal circuits. Our objectives are ambitious, and in the first ten months of operations at Janelia we have made some good beginnings which I will describe below. 相似文献
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On August 1, 2006 the Howard Hughes Medical Institute's first stand-alone research campus opened at Janelia Farm, near Washington DC. Our mission at Janelia is to do exceptional fundamental research. Our two scientific foci are to understand the function of neural circuits and to develop synergistic imaging technologies. To achieve this we have changed many of the conventions of academic and/or industrial science. The founding director at Janelia is the well-known Drosophilist Gerry Rubin, who has been a central figure in fly molecular, developmental and genomic biology in recent decades. Not coincidentally, we at Janelia fully appreciate the potential of flies to contribute to an understanding of neuronal circuits. Our objectives are ambitious, and in the first ten months of operations at Janelia we have made some good beginnings. 相似文献
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Sophie G. Martin 《Molecular biology of the cell》2012,23(21):4148-4150
I am tremendously honored to receive the 2012 Women in Cell Biology Junior Award. In this essay, I recount my career path over the past 15 years. Although many details are specific to my own experiences, I hope that some generalizations can be made to encourage more women to pursue independent scientific careers. Mine is a story of choosing a captivating question, making the most of your opportunities, and finding a balance with life outside the lab.It is a great honor to have been awarded the 2012 Women in Cell Biology Junior Award from the ASCB. Looking back at the 15 years I have spent doing research in cell biology, my overwhelming feeling is that it has been and still is a lot of fun. I am extremely fortunate to have a job that I truly enjoy and that gives me complete intellectual freedom. My lab choices over the years were motivated by scientific curiosity and enthusiasm for new environments and topics, rather than by career building. It is thus truly amazing to be rewarded for (rather a lot of) work enjoyed. 相似文献
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A geometrical model of the emergence of a primordium at the shoot apex in dicotyledons is proposed. It is based on recent fundamental results on plant morphogenesis, i.e.:
- the emergence is preceded by the reorganization of the microtubules of the cortical cytoskeleton, leading to a new orientation of the synthesis of the cell wall microfibrils;
- the resulting global stress is related to the general orientation of the cell growth.
- Why does the principal stem shift its growth direction after each lateral emergence?
- Why do the three axes involved in any ramification (namely the old and the new principal stems and the lateral emergence) exhibit a plane configuration whereas this is an essentially three dimensional phenomenon?
- Does phyllotaxis exclusively depend upon the local emergence of a primordium?
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The annual meeting of the American Society for Cell Biology (ASCB) is a large and diverse gathering. At last year's meeting**The American Society for Cell Biology 38th Annual Meeting, San Francisco, USA; 12-16 December, 1998. Program chair: Jennifer Lippincott-Schwartz., there were over 8000 attendees, and the topics discussed covered many areas of cell biology. It would be impossible to cover the entire meeting within a trends in CELL BIOLOGY report, so instead we are focusing on an aspect of it that provided some of the most interesting and fruitful discussions. On Saturday afternoon, before the main symposia began, there were 11 special-interest subgroup meetings. The atmosphere at these meetings was informal, and they encouraged open and frank discussion of data and issues. This report provides a brief summary of the discussions at seven of the special-interest subgroup meetings. 相似文献
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