منابع مشابه
Torrey Botanical Society Succession after Elimination of Buried Seeds from a Recently Plowed Field
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متن کاملTorrey Botanical Society Co - Occurrence of Oak Subgenera : Implications for Niche Differentiation
MOHLER, C. L. (Section of Ecology & Systematics, Division of Biological Sciences, Cornell University, Ithaca, NY 14853). Co-occurrence of oak subgenera: implications for niche differentiation. Bull. Torrey Bot. Club 117: 247-255. 1990.-It is generally very difficult todetermine whether the coexistence of two tree species in a forest is due to a difference inthe species' niches or due to disturb...
متن کاملTorrey , Matthew
I t is now 16 years since Nowikoff (1908) accelerated the division rate of Paramecium by adding thyroid gland to his cultures. Later , Shumway (1914) reached the same conclusion after a series of more critical and painstaking experiments, and in the following year Budington and Harvey (1915) showed tha t thyroids from various vertebrates would produce similar results. Still later, Shumway (1917...
متن کاملHarry Beal Torrey , Matthew
I t is now 16 years since Nowikoff (1908) accelerated the division rate of Paramecium by adding thyroid gland to his cultures. Later , Shumway (1914) reached the same conclusion after a series of more critical and painstaking experiments, and in the following year Budington and Harvey (1915) showed tha t thyroids from various vertebrates would produce similar results. Still later, Shumway (1917...
متن کاملBotanical ratchets.
Ratcheting surfaces are a common motif in nature and appear in plant awns and grasses. They are known to proffer selective advantages for seed dispersion and burial. In two simple model experiments, we show that these anisotropically toothed surfaces naturally serve as motion rectifiers and generically move in a unidirectional manner, when subjected to temporally and spatially symmetric excitat...
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ژورنال
عنوان ژورنال: Science
سال: 1902
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.15.388.908