Home About us Contact
|
Home About us Contact | ||
|
|
||
Full Description (full + description)
Selected AbstractsThree new or little-known Chassalia (Rubiaceae) species from west and central AfricaNORDIC JOURNAL OF BOTANY, Issue 1 2010Olivier Lachenaud A new species from Liberia and Côte d'Ivoire, Chassalia bicostata O. Lachenaud & Jongkind, is described and compared with its two close relatives, C. pteropetala (K. Schum.) Cheek and C. pleuroneura (K. Schum.) O. Lachenaud, both from central Africa. The latter is here transferred to Chassalia from Psychotria. All three species share deeply bifid stipules, which are an unusual feature in Chassalia. Full descriptions and illustrations are given for the three taxa. [source] Two new and endangered species of Coffea (Rubiaceae) from the Eastern Arc Mountains (Tanzania) and notes on associated conservation issuesBOTANICAL JOURNAL OF THE LINNEAN SOCIETY, Issue 2 2004AARON P. DAVIS Coffea bridsoniae and C. kihansiensis are described as new species from the Eastern Arc Mountains, Tanzania. Full descriptions and conservation assessments are given, and affinities with other East African Coffea species are discussed. Supplementary taxonomic notes on Tanzanian Coffea are given, including a concise species checklist. Conservation issues concerning Tanzanian Coffea and the Kihansi River Gorge are briefly covered. © 2004 The Linnean Society of London, Botanical Journal of the Linnean Society, 2004, 146, 237,245. [source] Organic Single-Crystal Schottky Gate TransistorsADVANCED MATERIALS, Issue 36 2009Toshihiko Kaji Schottky contacts and Schottky gate transistors on organic single crystals are successfully fabricated, and enable the complete understanding of the operating mechanism as well as a full description of the energy-band diagram. This represents a considerable step forward in the understanding of organic semiconductors, and offers a viable route for organic-device design. [source] Genome-wide analysis of gene expression in adult Anopheles gambiaeINSECT MOLECULAR BIOLOGY, Issue 1 2006O. Marinotti Abstract With their genome sequenced, Anopheles gambiae mosquitoes now serve as a powerful tool for basic research in comparative, evolutionary and developmental biology. The knowledge generated by these studies is expected to reveal molecular targets for novel vector control and pathogen transmission blocking strategies. Comparisons of gene-expression profiles between adult male and nonblood-fed female Anopheles gambiae mosquitoes revealed that roughly 22% of the genes showed sex-dependent regulation. Blood-fed females switch the majority of their metabolism to blood digestion and egg formation within 3 h after the meal is ingested, in detriment to other activities such as flight and response to environment stimuli. Changes in gene expression are most evident during the first, second and third days after a blood meal, when as many as 50% of all genes showed significant variation in transcript accumulation. After laying the first cluster of eggs (between 72 and 96 h after the blood meal), mosquitoes return to a nongonotrophic stage, similar but not identical to that of 3-day-old nonblood-fed females. Ageing and/or the nutritional state of mosquitoes at 15 days after a blood meal is reflected by the down-regulation of ,5% of all genes. A full description of the large number of genes regulated at each analysed time point and each biochemical pathway or biological processes in which they are involved is not possible within the scope of this contribution. Therefore, we present descriptions of groups of genes displaying major differences in transcript accumulation during the adult mosquito life. However, a publicly available searchable database (http://www.angagepuci.bio.uci.edu/) has been made available so that detailed analyses of specific groups of genes based on their descriptions, functions or levels of gene expression variation can be performed by interested investigators according to their needs. [source] Practical performance of digital cellular system in mass rapid transit environmentsINTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 2 2005Y. P. ZhangArticle first published online: 13 DEC 200 Abstract Leaky coaxial cables have found applications in the creation of network infrastructures for mobile and personal communication services in underground and enclosed spaces. A digital cellular system based on the GSM 900 standard and using radiated mode leaky coaxial cables has been implemented in an underground mass rapid transit environment. This paper presents the practical performance evaluation of the system. First, we start with a brief introduction of a radiated mode leaky coaxial cable and the digital cellular system GSM 900, and then we move into a full description of the measurement campaign; next we focus on an analysis of the measured performance data about received signal level, received signal quality, speech quality index and grade of service. The results show that the system performance is generally good; however, the poor system performance often occurs at the terminals of the leaky coaxial cable. In addition, it is found that the system performance is highly correlated with the density of train passenger. The higher train passenger density degrades the system performance. Copyright © 2004 John Wiley & Sons, Ltd. [source] In Vivo Gene Transfer Studies on the Regulation and Function of the Vasopressin and Oxytocin GenesJOURNAL OF NEUROENDOCRINOLOGY, Issue 2 2003D. Murphy Abstract Novel genes can be introduced into the germline of rats and mice by microinjecting fertilized one-cell eggs with fragments of cloned DNA. A gene sequence can thus be studied within the physiological integrity of the resulting transgenic animals, without any prior knowledge of its regulation and function. These technologies have been used to elucidate the mechanisms by which the expression of the two genes in the locus that codes for the neuropeptides vasopressin and oxytocin is confined to, and regulated physiologically within, specific groups of neurones in the hypothalamus. A number of groups have described transgenes, derived from racine, murine and bovine sources, in both rat and mouse hosts, that mimic the appropriate expression of the endogenous vasopressin and genes in magnocellular neurones (MCNs) of the supraoptic and paraventricular nuclei. However, despite considerable effort, a full description of the cis -acting sequences mediating the regulation of the vasopressin-oxytocin locus remains elusive. Two general conclusions have nonetheless been reached. First, that the proximal promoters of both genes are unable to confer any cell-specific regulatory controls. Second, that sequences downstream of the promoter, within the structural gene and/or the intergenic region that separates the two genes, are crucial for appropriate expression. Despite these limitations, sufficient knowledge has been garnered to specifically direct the expression of reporter genes to vasopressin and oxytocin MCNs. Further, it has been shown that reporter proteins can be directed to the regulated secretory pathway, from where they are subject to appropriate physiological release. The use of MCN expression vectors will thus enable the study of the physiology of these neurones through the targeted expression of biologically active molecules. However, the germline transgenic approach has a number of limitations involving the interpretation of phenotypes, as well as the large cost, labour and time demands. High-throughput somatic gene transfer techniques, principally involving the stereotaxic injection of hypothalamic neuronal groups with replication-deficient adenoviral vectors, are now being developed that obviate these difficulties, and which enable the robust, long-lasting expression of biologically active proteins in vasopressin and oxytocin MCNs. [source] Soliton solutions of the Toda hierarchy on quasi-periodic backgrounds revisitedMATHEMATISCHE NACHRICHTEN, Issue 4 2009Iryna Egorova Abstract We investigate soliton solutions of the Toda hierarchy on a quasi-periodic finite-gap background by means of the double commutation method and the inverse scattering transform. In particular, we compute the phase shift caused by a soliton on a quasi-periodic finite-gap background. Furthermore, we consider short range perturbations via scattering theory. We give a full description of the effect of the double commutation method on the scattering data and establish the inverse scattering transform in this setting (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Metaphors for Navigating NegotiationsNEGOTIATION JOURNAL, Issue 3 2005Thomas H. Smith A metaphor operates covertly to gain tacit agreement on direction, means, and ends without full description or rationale. It constrains a discussion, focusing on certain concerns while masking others. Becoming consciously aware of the metaphors commonly used during negotiation offers valuable insights into meanings not overtly discussed. This awareness helps reveal intentions and implicit evaluations while also illuminating obvious areas for mutual gain. It suggests ways to reinforce rapport, to persevere in negotiating, to reflect and query usefully, and to explore and propose different options. Drawing on the large body of applied metaphor research, including conceptual metaphor theory, several structural properties of metaphor are explained. Their usefulness in detecting metaphors, elaborating how metaphors map issues being discussed, and unpacking meaning is illustrated using excerpts from a negotiation case transcript. This article argues that when a negotiator becomes conscious of such metaphors, more options become available for intelligent exploration. [source] Time-cure-temperature superposition for the prediction of instantaneous viscoelastic properties during curePOLYMER ENGINEERING & SCIENCE, Issue 6 2000Yongsung Eom The relative sequence of shrinkage and evolution of modulus of a thermoset resin during cure leads to the build-up of internal stresses, especially if the resin is constrained by the presence of other materials in the form of a substrate or reinforcing fibers. To enable prediction of the levels of internal stress generated during processing and to determine appropriate processing windows, the evolution of the modulus of an epoxy-amine system during cure has been characterized and described with a phenomenological model. A combined reaction kinetics model is used to determine the degree of conversion of the epoxy over any complete range of cure. The chemorheological properties of the resin are measured as a function of curing temperature with a torsional parallel plate rheometer. A new phenomenological approach for time-cure-temperature superposition is proposed for predicting the relaxation modulus at any moment during cure and at any cure temperature. The combination of these two models provides a full description of the instantaneous viscoelastic properties during cure. This approach, which can be adapted to any curing resin, provides suitable tools for the analysis of viscoelastic stress build-up following any industrially relevant cure cycle. [source] The Roman fine wares of ed-Dur (Umm al-Qaiwain, U.A.E.) and their distribution in the Persian Gulf and the Indian OceanARABIAN ARCHAEOLOGY AND EPIGRAPHY, Issue 1 2007Katrien RuttenArticle first published online: 4 MAY 200 Excavations and surveys at ed-Dur have produced a small amount of Roman fine ware sherds of varied Mediterranean origin. This article aims to offer a full description and analysis of this material and to assess the distribution of these wares from their region of production to their final destination at ed-Dur. These wares reveal a local Arabian exchange system of Mediterranean goods and provide evidence for a link between the two major sea routes through the Persian Gulf and the Indian Ocean. [source] On the possibility of using polycrystalline material in the development of structure-based generic assaysACTA CRYSTALLOGRAPHICA SECTION D, Issue 4 2009Marc Allaire The discovery of ligands that bind specifically to a targeted protein benefits from the development of generic assays for high-throughput screening of a library of chemicals. Protein powder diffraction (PPD) has been proposed as a potential method for use as a structure-based assay for high-throughput screening applications. Building on this effort, powder samples of bound/unbound states of soluble hen-egg white lysozyme precipitated with sodium chloride were compared. The correlation coefficients calculated between the raw diffraction profiles were consistent with the known binding properties of the ligands and suggested that the PPD approach can be used even prior to a full description using stereochemically restrained Rietveld refinement. [source] | |||||||||||||