共查询到20条相似文献,搜索用时 15 毫秒
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Helmut Hölder 《Pal?ontologische Zeitschrift》1983,57(3-4):325-328
F. A. Quenstedt (University of Tübingen 1837–1889), master of Jurassic stratigraphy, was contrary to some misunderstandings also a forerunner of the gradualistic evolutionary idea. 相似文献
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Wolfgang Riegraf 《Pal?ontologische Zeitschrift》2000,74(3):281-303
E. F. v. Schlotheim described 46 species of Jurassic and Cretaceous belemnites in 1813,1820, and 1832. Their type specimens are in part housed at the Humboldt University of Berlin. The holotype ofBelemnites irregularis is here refigured. Lectotypes forB. acuarius, B. canaliculatus, B. clavatus, B. giganteus, andB. tripartitus are designated and figured for the first time. The lectotype ofBelemnites giganteus is designated to be the neotype ofBelemnites suevicus Klein 1773. 36 species are nomina nuda and nomina dubia, because none of their type specimens could be detected, among them the invalidB. paxillosus v. Schlotheim 1820, which is, according to its lectotype designated herein, likeBelemnites giganteus, a junior synonym ofMegateuthis suevica (Klein 1773). An original type specimenof Belemnites mucronatusv. Schlotheim 1813, for which a neotype had already been ruled by the ICZN in 1985, was re-discovered in thev. Schlotheim collection in 1996.v. Schlotheim’s belemnites were up to now designated to be type species of 12 genera. 相似文献
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《中国科学:生命科学英文版》2015,(11)
<正>The Department of Biology at Peking University was established in 1925,with Mr.Tan Xi Hong as its inaugural department head.In 1993,the department was renamed the School of Life Sciences.During the past 90 years,a steady stream of students has enrolled in the department in order to explore the secrets of life and to dedicate themselves to the advancement of society. 相似文献
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E. Stresemann und Ad. Schneider 《Journal of Ornithology》1938,86(2):302-307
Ohne Zusammenfassung 相似文献
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O. V. Amitrov G. A. Afanasjeva A. F. Bannikov I. S. Barskov M. F. Bogoslovskaya M. S. Boiko M. A. Fedonkin I. A. Gontsharova R. V. Gorjunova L. B. Iljina V. A. Konovalova L. F. Kuzina Ya. M. Kuzmina V. B. Kushlina S. S. Lazarev T. B. Leonova A. V. Lopatin A. V. Mazaev I. N. Manankov V. V. Mitta I. A. Mikhailova L. A. Nevesskaja S. V. Nikolaeva L. I. Novitskaya A. G. Ponomarenko S. V. Popov A. P. Rasnitsyn S. V. Rozhnov A. Yu. Rozanov M. A. Shishkin B. S. Sokolov A. N. Solovjev L. P. Tatarinov L. A. Viskova B. T. Yanin A. L. Yurina F. A. Zhuravleva 《Paleontological Journal》2007,41(3):345-346
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The response of marine phytoplankton to the ongoing increase in atmospheric pCO2 reflects the consequences of both increased CO2 concentration and decreased pH in surface seawater. In the model diatom Thalassiosira weissflogii, we explored the effects of varying pCO2 and pH, independently and in concert, on photosynthesis and respiration by incubating samples in water enriched in H2 18O. In long-term experiments (~6-h) at saturating light intensity, we observed no effects of pH or pCO2 on growth rate, photosynthesis or respiration. This absence of a measurable response reflects the very small change in energy used by the carbon concentrating mechanism (CCM) compared to the energy used in carbon fixation. In short-term experiments (~3 min), we also observed no effects of pCO2 or pH, even under limiting light intensity. We surmise that in T. weissflogii, it is the photosynthetic production of NADPH and ATP, rather than the CO2-saturation of Rubisco that controls the rate of photosynthesis at low irradiance. In short-term experiments, we observed a slightly higher respiration rate at low pH at the onset of the dark period, possibly reflecting the energy used for exporting H+ and maintaining pH homeostasis. Based on what is known of the biochemistry of marine phytoplankton, our results are likely generalizable to other diatoms and a number of other eukaryotic species. The direct effects of ocean acidification on growth, photosynthesis and respiration in these organisms should be small over the range of atmospheric pCO2 predicted for the twenty-first century. 相似文献
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Joshua Buhs 《Journal of the history of biology》2000,33(1):27-70
Ideas about the natural world are intertwined with the personalities, practices, and the workplaces of scientists. The relationships
between these categories are explored in the life of the taxonomist William Steel Creighton. Creighton studied taxonomy under
William Morton Wheeler at Harvard University. He took the rules he learned from Wheeler out of the museum and into the field.
In testing the rules against a new situation, Creighton found them wanting. He sought a new set of taxonomic principles, one
he eventually found in Ernst Mayr's Systematics and the Origin of Species. Mayr's ideas tied together a number of themes running through Creighton's life: the need for a revised taxonomy, the emphasis
on fieldwork, and the search for a new power center for ant taxonomy after Wheeler died. Creighton's adoption of Mayr's ideas
as part of his professional identity also had very real implications for his career path: field studies required long and
intensive studies,
and Creighton would always be a slow worker. His method of taxonomy contrasted sharply not only with Wheeler's but also with
two of his younger colleagues, William L. Brown and E. O. Wilson, who took over Wheeler's spot at Harvard in 1950. The disputes
between these men over ant taxonomy involved, in addition to questions of technical interest, questions about where and how
best to do taxonomy and who could speak withthe most authority. Creighton's story reveals how these questions are interrelated.
The story also reveals the importance of Mayr's book for changes occurring in taxonomy in the middle of the twentieth century.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Susan Scheer Shoshanna Nakelsky Trista Bingham Mark Damesyn Dan Sun Chi-Sheng Chin Anthony Buckman Karen E. Mark 《PloS one》2013,8(2)