Maize (Zea mays L.) stem is thought to function alternately as a net importing and net exporting organ during ontogeny, depending on whole plant photosynthetic source and sink status. The [(14)C]sucrose and [(14)C]glucose uptake capacity of stem tissues was investigated to increase our understanding of the transport factors which may influence sink status.Uptake from solutions containing up to ...

this paper investigates the use of ‘lexical bundles’ in two broad corpora of journalistic writing. the aim of this study is to compare the use of lexical bundles in the two domains, one consisted of newspaper articles written in english and published in england and the other one comprised of newspaper articles written in persian from iranian publications. for this purpose, the frequency of occu...

BACKGROUND AND AIMS The process of vascular development in plants results in the formation of a specific array of bundles that run throughout the plant in a characteristic spatial arrangement. Although much is known about the genes involved in the specification of procambium, phloem and xylem, the dynamic processes and interactions that define the development of the radial arrangement of such t...

Abstract: Lexical bundles, as building blocks of coherent discourse, have been the subject of much research in the last two decades. While many of such studies have been mainly concerned with  exploring  variations  in  the  use  of  these  word  sequences  across  different  registers  and disciplines, very few have addressed the use of some particular groups of lexical bundles within some gen...

Class III HD-Zip (HD-Zip III) family genes play key roles in a number of fundamental developmental programs in Arabidopsis thaliana, such as embryo patterning, meristem initiation and homeostasis, lateral organ polarity and vascular development. Semidominant gain-of-function alleles of the HD-Zip III genes PHABULOSA (PHB), PHAVOLUTA (PHV) and REVOLUTA (REV) disrupt the negative regulation of th...

as a member of larger familyof formulaic sequences , lexical bundles play different discourse functions in written research articles. this study investigated the use of four-word lexical bundles in published research articles in medicine via natural language processing by computational linguistics. a corpus of 2,420,914 words was extracted from 790 research articles in 33 medical disciplines. f...

The goal of the following research project was to perform a three-dimensional reconstruction of selected CDs and associated AVR as they ascend through the IM/OM border, and determine whether AVR in this region coalesce to form giant vascular bundles, or whether they do so in a more dispersed pattern, interacting with components of the interbundle regions. The previously accepted model of vascul...

The nerve fiber layer of several species of primate has been studied with Golgi silver impregnations and Nissl stains. The morphology, distribution, and density of fibrous astrocytes of the nerve fiber layer are described. Two classes of astrocytes are distinguished: elongated cells whose processes parallel the nerve fiber bundles and cover a rectangular area more than two time longer than wide...