PALEOECOLOGY: Turning Over a New Leaf
نویسندگان
چکیده
منابع مشابه
Turning over a new leaf. Tobacco.
Anticipating a diminishing market for cigarettes and other tobacco products in the future, researchers around the country are studying alternative uses for tobacco plants. The most promising field of research for tobacco involves the genetic engineering of tobacco plants to produce various substances such as industrial chemicals, pharmaceuticals, and consumer product ingredients. Tobacco has be...
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Among the many products found in the bustling markets of the Yemeni capital Sana’a are bundles of stripped branches covered by scraps of cloth or plastic, put there to preserve the freshness of the tender oval leaves, known locally as khat. Grown in the surrounding highland towns, khat is picked at dawn from groves of the tall-growing Catha edulis plant and by midday has found a buyer who that ...
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Hawaiian endemic tree Acacia koa is a model for heteroblasty with bipinnately compound leaves and phyllodes. Previous studies suggested three hypotheses for their functional differentiation: an advantage of leaves for early growth or shade tolerance, and an advantage of phyllodes for drought tolerance. We tested the ability of these hypotheses to explain differences between leaf types for potte...
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Aortic valve diseases are debilitating cardiovascular disorders associated with significant morbidity and mortality. Although there continue to be major efforts to improve the longevity of replacement valves and to improve tissue engineered substitutes,1 the underlying mechanisms that may be responsible for the initiation and development of valve pathology have received less attention than have...
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ژورنال
عنوان ژورنال: Science
سال: 2004
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.305.5690.1535c