منابع مشابه
on semihypergroups and hypergroups
in this thesis, first the notion of weak mutual associativity (w.m.a.) and the necessary and sufficient condition for a $(l,gamma)$-associated hypersemigroup $(h, ast)$ derived from some family of $lesssim$-preordered semigroups to be a hypergroup, are given. second, by proving the fact that the concrete categories, semihypergroups and hypergroups have not free objects we will introduce t...
15 صفحه اولMicrocyclic rusts of hollyhock (Alcea rosea)
Rust fungi infecting hollyhock and other plants in Malveae are frequently intercepted at ports of entry to the USA, particularly Puccinia malvacearum and P. heterogenea. These two species can be difficult to distinguish and can be further confused with other, less common species of microcyclic rust fungi infecting hollyhock: P. heterospora, P. lobata, P. platyspora, and P. sherardiana. Molecula...
متن کاملFunctional genomic approaches in cereal rusts
Cereal rust fungi are pathogens of major importance to agriculture, threatening cereal production worldwide. Targeted breeding for resistance, based on information from fungal surveys and population structure analyses of virulence, has been effective. Nevertheless, breakdown of resistance occurs frequently and continued efforts are needed to understand how these fungi overcome resistance and to...
متن کاملLack of communication rusts and ages stem cells
Life-long hematopoietic demands are filled by a pool of hematopoietic stem cells (HSC) with self-renewal and multipotential differentiation ability. Generation of reactive oxygen species (ROS) at low and moderate levels is required for HSC activity. However, a sustained, abnormal increase in ROS production occurs under aging and genotoxic stress, which inhibits HSC self-renewal and induces HSC ...
متن کاملcompactifications and function spaces on weighted semigruops
chapter one is devoted to a moderate discussion on preliminaries, according to our requirements. chapter two which is based on our work in (24) is devoted introducting weighted semigroups (s, w), and studying some famous function spaces on them, especially the relations between go (s, w) and other function speces are invesigated. in fact this chapter is a complement to (32). one of the main fea...
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ژورنال
عنوان ژورنال: American Journal of Botany
سال: 1921
ISSN: 0002-9122
DOI: 10.2307/2435466