Results 281 to 290 of about 1,285,891 (313)
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Science News, 1986
A t one time, scientists thought that mountains and valleys arise because the earth is shrinking; all the wrinkles, folds, faults and other deformations in the planet's crust were likened to the crinkly skin of a drying apple. Then came the theory of plate tectonics, which revolutionized the earth sciences and gave researchers a more tenable framework ...
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A t one time, scientists thought that mountains and valleys arise because the earth is shrinking; all the wrinkles, folds, faults and other deformations in the planet's crust were likened to the crinkly skin of a drying apple. Then came the theory of plate tectonics, which revolutionized the earth sciences and gave researchers a more tenable framework ...
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Decomposition of Root Tips, Fine Roots, and Coarse Roots
2020Decomposition of fine-root litter is much less studied than that of foliar litter although fine root litter is a major contributor to litter input to the forest soil. This chapter is devoted to decomposition of root tips and fine roots. Root litter decomposition may be studied using litter bags, through following remaining root mass in soil cores, or ...
Charles McClaugherty, Björn Berg
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Australian Dental Journal, 1986
Abstract— Over the past years a great deal of work has been done in the field of tooth root resorption but notwithstanding this, understanding of the subject has progressed very little. This paper reviews the subject and suggests ways of minimizing root resorption or perhaps even eliminating it.
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Abstract— Over the past years a great deal of work has been done in the field of tooth root resorption but notwithstanding this, understanding of the subject has progressed very little. This paper reviews the subject and suggests ways of minimizing root resorption or perhaps even eliminating it.
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Journal of the History of Ideas, 1995
S'appuyant sur les travaux de L. Febvre et D. Wotton, l'A. retrace l'historiographie des preuves et des persuasions qui ont contribue au debat sur l'incroyance et l'atheisme, depuis le spinozisme jusqu'au neorepublicanisme, et depuis le christianisme primitif jusqu'a l'heterodoxie ...
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S'appuyant sur les travaux de L. Febvre et D. Wotton, l'A. retrace l'historiographie des preuves et des persuasions qui ont contribue au debat sur l'incroyance et l'atheisme, depuis le spinozisme jusqu'au neorepublicanisme, et depuis le christianisme primitif jusqu'a l'heterodoxie ...
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International Journal of Algebra and Computation, 2001
In this work we study the problem of determining an unambiguous p-root of a language, i.e. a solution of the equation Xp=L when L is a language and the product is unambiguous. We show that every language admits at most one unambiguous root and that the problem of the existence of the unambiguous root is undecidable for the class of context free ...
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In this work we study the problem of determining an unambiguous p-root of a language, i.e. a solution of the equation Xp=L when L is a language and the product is unambiguous. We show that every language admits at most one unambiguous root and that the problem of the existence of the unambiguous root is undecidable for the class of context free ...
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Science, 2021
A new influx of funds could help realize Africa's Great Green Wall. But will the massive tree-planting effort learn from past failures?
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A new influx of funds could help realize Africa's Great Green Wall. But will the massive tree-planting effort learn from past failures?
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Science, 2012
Plant Science![Figure][1] CREDIT: DIANE DIEDERICH/ISTOCK PHOTO Too much salt is as bad for plants as it is for us. For plants, salt stress and drought stress go hand in hand. Some of the more rapid responses to salt stress are signaled through actions of the sucrose nonfermenting ...
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Plant Science![Figure][1] CREDIT: DIANE DIEDERICH/ISTOCK PHOTO Too much salt is as bad for plants as it is for us. For plants, salt stress and drought stress go hand in hand. Some of the more rapid responses to salt stress are signaled through actions of the sucrose nonfermenting ...
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Root Growth and Rooting of Basswood
Botanical Gazette, 1968Seedling root growth of basswood (Tilia americana L.) was observed in soil pits between nursery rows, in pots (by inverting the soil ball), and in Lucite cylinders in the greenhouse. Root growth occurred primarily during late spring, summer, and fall in the nursery. It occurred throughout the year in the greenhouse.
James N. Cummins, William C. Ashby
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Physiologia Plantarum, 1990
Nodulin gene expression is an integral and highly specific part of the formation of nitrogen‐fixing nodules on the roots of leguminous plants. Dependent on the time of expression during root nodule development, nodulin genes can be divided into early and late nodulin genes.
Nap, J.P.H., Bisseling, T.
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Nodulin gene expression is an integral and highly specific part of the formation of nitrogen‐fixing nodules on the roots of leguminous plants. Dependent on the time of expression during root nodule development, nodulin genes can be divided into early and late nodulin genes.
Nap, J.P.H., Bisseling, T.
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On generation of the root lattice by roots
Mathematical Proceedings of the Cambridge Philosophical Society, 2007AbstractLet Φ be a root system and let Γ ⊆ Φ. In this short paper we prove that Γ contains a ${\mathbb Z}$-basis of the lattice that it generates.
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