Results 11 to 20 of about 764,204 (311)
BMC Plant Biology, 2023 Background Phosphorus (P) deficiency in desert ecosystems is widespread. Generally, desert species may allocate an enormous proportion of photosynthetic carbon to their root systems to adjust their P-acquisition strategies.
Yanju Gao +3 more
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Effects of short-term nitrogen and phosphorus addition on leaf stoichiometry of a dominant alpine grass [PDF]
PeerJ, 2021 The effects of increasing nitrogen (N) and phosphorus (P) deposition on the nutrient stoichiometry of soil and plant are gaining improving recognition. However, whether and how the responses of N cycle coupled with P of the soil–plant system to external ...
YaLan Liu +5 more
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SSRN Electronic Journal, 2017 Exploiting a novel geo-referenced data set of population diversity across ethnic groups, this research advances the hypothesis and empirically establishes that variation in population diversity across human societies, as determined in the course of the exodus of humans from Africa tens of thousands of years ago, contributed to the differential ...
Oded Galor, Marc Klemp
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Large-girth roots of graphs [PDF]
, 2010 We study the problem of recognizing graph powers and computing roots of graphs. Our focus is on classes of graphs with no short cycles. We provide a polynomial time recognition algorithm for r-th powers of graphs of girth at least 2r vertical bar 3, thus
Adamaszek, Michal +4 more
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The impact of the Lisbon Treaty on the development of EU immigration legislation
Croatian Yearbook of European Law and Policy, 2009 Although the status of the Lisbon Treaty is still pending, the possible impact that it can have on the EU’s immigration legislation is worth analysing and discussing.
Lehte Roots
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Physiological changes of three woody plants exposed to progressive salt stress
Photosynthetica, 2021 The saline character of water imposes restrictions on plant growth and survival in the Taklamakan Desert, China. Experiments were conducted on woody plant species, Tamarix ramosissima, Populus euphratica, and Haloxylon ammodendron grown under different ...
Y. LU, F.J. ZENG, X.Y. LI, B. ZHANG
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The New EURODAC Regulation: Fingerprints as a Source of Informal Discrimination
Baltic Journal of European studies, 2015 The EURODAC Regulation establishes the database of the fingerprints of asylum seekers. In 2015, the new EURODAC Regulation came in force and some basic concepts that were not in the previous regulation have been changed.
Roots Lehte
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Systematic Biology, 2012 The estimation of phylogenetic relationships is an essential component of understanding evolution. Accurate phylogenetic estimation is difficult, however, when internodes are short and old, when genealogical discordance is common due to large ancestral effective population sizes or ancestral population structure, and when homoplasy is prevalent ...
Bewick, A. +3 more
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What do local foods consumers want?
Journal of Agriculture, Food Systems, and Community Development, 2022 The local foods movement is now firmly entrenched in the public imagination and as a feature of the larger food economy. With the most recent wave of local food retail markets now in its second decade, scholarly attention has turned to the factors that
Matthew Mariola +2 more
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, 2006 A wide range of counting and occurrence constraints can be specified with just two global primitives: the Range constraint, which computes the range of values used by a sequence of variables, and the Roots constraint, which computes the variables mapping onto a set of values. We focus here on the Roots constraint.
Christian Bessiere +4 more
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