نتایج جستجو برای: accumulators species

تعداد نتایج: 548385  

2013
Jie Yang Nathan G. Swenson Min Cao George B. Chuyong Corneille E. N. Ewango Robert Howe David Kenfack Duncan Thomas Amy Wolf Luxiang Lin

Ecologists have historically used species-area relationships (SARs) as a tool to understand the spatial distribution of species. Recent work has extended SARs to focus on individual-level distributions to generate individual species area relationships (ISARs). The ISAR approach quantifies whether individuals of a species tend have more or less species richness surrounding them than expected by ...

Journal: :journal of rangeland science 0
mehdi moameri assistant professor, university of mohaghegh ardabili, ardabil, iran mohammad jafari university of tehran ali tavili university of tehran babak motasharezadeh university of tehran mohammad ali zare chahuoki university of tehran

there are many remediating methods for the polluted soils but only phytoremediation is a cost effective, environmental friendly, aesthetically pleasing approach that is most suitable for many countries. the purpose of this study was to investigate the potential of native plants for phytoremediation of contaminated soils with lead, zinc, cadmium and nickel in the rangelands around national lead ...

There are many remediating methods for the polluted soils but only phytoremediation is a cost effective, environmental friendly, aesthetically pleasing approach that is most suitable for many countries. The purpose of this study was to investigate the potential of native plants for phytoremediation of contaminated soils with lead, zinc, cadmium and nickel in the rangelands around National Lead ...

Journal: :Plant physiology 1981
D C Eustice F J Kull A Shrift

Selenium-accumulator plants synthesize selenium compounds that differ from those produced by nonaccumulators. To determine if there are any subcellular differences between accumulators and nonaccumulators in the use of selenomethionine in vitro, polysomes from Astragalus crotalariae (accumulator) and Astragalus lentiginosis (nonaccumulator) were translated in the presence of selenomethionine. P...

Journal: :Annals of botany 2003
Steven Jansen Toshihiro Watanabe Steven Dessein Erik Smets Elmar Robbrecht

Concentrations of Al, Si, Fe, Mn, Cu and Ca were analysed in leaves of ten Rubiaceae species, most of which are Al accumulators, and these were compared with concentrations in one species of Melastomataceae. Quantitative data confirmed the distribution of Al accumulation as previously determined by semi-quantitative tests, and suggest that there is an apparent congruency between the shoot Al co...

Journal: :IACR Cryptology ePrint Archive 2015
David Derler Christian Hanser Daniel Slamanig

Cryptographic accumulators allow to accumulate a finite set of values into a single succinct accumulator. For every accumulated value, one can efficiently compute a witness, which certifies its membership in the accumulator. However, it is computationally infeasible to find a witness for any nonaccumulated value. Since their introduction, various accumulator schemes for numerous practical appli...

2015
Martina Sura-de Jong Ray J. B. Reynolds Klara Richterova Lucie Musilova Lucian C. Staicu Iva Chocholata Jennifer J. Cappa Safiyh Taghavi Daniel van der Lelie Tomas Frantik Iva Dolinova Michal Strejcek Alyssa T. Cochran Petra Lovecka Elizabeth A. H. Pilon-Smits

Selenium (Se)-rich plants may be used to provide dietary Se to humans and livestock, and also to clean up Se-polluted soils or waters. This study focused on endophytic bacteria of plants that hyperaccumulate selenium (Se) to 0.5-1% of dry weight. Terminal restriction fragment length polymorphism (T-RFLP) analysis was used to compare the diversity of endophytic bacteria of hyperaccumulators Stan...

2007
Jiangtao Li Ninghui Li Rui Xue

Based on the notion of accumulators, we propose a new cryptographic scheme called universal accumulators. This scheme enables one to commit to a set of values using a short accumulator and to efficiently compute a membership witness of any value that has been accumulated. Unlike traditional accumulators, this scheme also enables one to efficiently compute a nonmembership witness of any value th...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2007
Thorsten Wiegand C V Savitri Gunatilleke I A U Nimal Gunatilleke Andreas Huth

A persistent challenge in ecology is to explain the high diversity of tree species in tropical forests. Although the role of species characteristics in maintaining tree diversity in tropical forests has been the subject of theory and debate for decades, spatial patterns in local diversity have not been analyzed from the viewpoint of individual species. To measure scale-dependent local diversity...

2015
Cheng-Han Tsai Yi-Ching Lin Thorsten Wiegand Takefumi Nakazawa Sheng-Hsin Su Chih-Hao Hsieh Tzung-Su Ding

The spatial structure of species richness is often characterized by the species-area relationship (SAR). However, the SAR approach rarely considers the spatial variability of individual plants that arises from species interactions and species' habitat associations. Here, we explored how the interactions of individual plants of target species influence SAR patterns at a range of neighborhood dis...

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