Plant architecture is commonly defined by the adjacency of organs within the structure and their properties. Few studies consider the effect of endogenous temporal factors, namely phenological factors, on the establishment of plant architecture. This study hypothesized that, in addition to the effect of environmental factors, the observed plant architecture results from both endogenous structur...

Postembryonic shoot development in maize (Zea mays L.) is divided into a juvenile vegetative phase, an adult vegetative phase, and a reproductive phase that differ in the expression of many morphological traits. A reduction in the endogenous levels of bioactive gibberellins (GAs) conditioned by any one of the dwarf1, dwarf3, dwarf5, or anther ear1 mutations in maize delays the transition from j...

www.frontiersin.org encountered in the vegetative state makes it utterly difficult to identify possible REM sleep other than by the presence of muscular atonia and eye movements – note that nocturnal penile erections have been convincingly shown in vegetative patients (Cologan et al., in press). The brain’s metabolic activity in a coma, as measured by fluorodeoxyglucose positron emission tomogr...

The purine nucleoside phosphorylases (PN-phosphorylase) from spores and vegetative cells of Bacillus cereus were each purified to electrophoretic homogeneity. The turnover numbers for the spore and vegetative cell enzymes were 145 and 181 moles of inosine cleaved per mole of enzyme per set, respectively. The PN-phosphorylase from vegetative cells was more anionic than that from the spores durin...

Polysomes were isolated from an enterotoxigenic strain of Clostridium perfringens during vegetative growth and at 1-h intervals after transfer into Duncan-Strong sporulation medium. During vegetative growth, about 67% of the ribosomes were in polysomal complexes. This proportion decreased to about 20% during the first 2 h in sporulation medium and then gradually increased to a maximum of 45% at...

Females of woody dioecious species usually devote more resources to reproduction than males. This may lead to a decrease in female survival and growth. The costs of reproduction, however, can be lightened through a number of mechanisms, as for example avoiding the temporal coincidence of reproduction and vegetative growth. The aim of this study was to evaluate whether males and females of P. le...

The apical shoot drives the yearly new stem growth of conifer trees, is the primary site for the establishment of chemical and physical defences, and is important in establishing subsequent perennial growth. This organ presents an interesting developmental system, with growth and development progressing from a meristematic tip through development of a primary vascular system, to a base with ful...

Precociously germinating Brassica napus (oilseed rape) embryos produce extra cotyledons or chimeric organs with sectors of cotyledon and leaf tissue, rather than leaves, at the shoot apex. To investigate this phenomenon in more detail, scanning electron microscopy was used to examine the development of organ primordia at the shoot apex. In situ hybridizations with molecular markers of the embry...

a bstract background: in recent years, the lack of organ for transplantation has resulted in health planners and authorities in all countries, including iran, paying serious attention to the issue. despite the above-mentioned fact, families with a member affected by brain death are not interested in organ donation. objective: this study is aimed at making an investigation into the decision-maki...