共查询到20条相似文献,搜索用时 15 毫秒
1.
Joyce Smith Cooper Liila Woods Seung Jin Lee 《The International Journal of Life Cycle Assessment》2008,13(5):389-400
Background, aims and scope
The goal of this work is to provide methodological information for modeling distance and backhaul for commodity transport in a life cycle inventory (LCI). The scope includes a review of modeling parameters accounted for in transport unit process models and accounted for in unit process models using transported materials. Assumptions related to backhaul (or return trip) and transport distance are characterized and evaluated. A case study explores the contribution of transport and the bearing of assumptions on the life cycle of select US-produced metals. 相似文献2.
Background
Automatic semantic role labeling (SRL) is a natural language processing (NLP) technique that maps sentences to semantic representations. This technique has been widely studied in the recent years, but mostly with data in newswire domains. Here, we report on a SRL model for identifying the semantic roles of biomedical predicates describing protein transport in GeneRIFs – manually curated sentences focusing on gene functions. To avoid the computational cost of syntactic parsing, and because the boundaries of our protein transport roles often did not match up with syntactic phrase boundaries, we approached this problem with a word-chunking paradigm and trained support vector machine classifiers to classify words as being at the beginning, inside or outside of a protein transport role. 相似文献3.
Yu Bai Lin Luo Ester van der Voet 《The International Journal of Life Cycle Assessment》2010,15(5):468-477
Background, aim, and scope
The increasing gasoline price, the depletion of fossil resources, and the negative environmental consequences of driving with petroleum fuels have driven the development of alternative transport fuels. Bioethanol, which is converted from cellulosic feedstocks, has attracted increasing attention as one such alternative. This study assesses the environmental impact of using ethanol from switchgrass as transport fuel and compares the results with the ones of gasoline to analyze the potential of developing switchgrass ethanol as an environmentally sustainable transport fuel. 相似文献4.
Daisuke Yamauchi Kazuhiro Nakaya Nithya N Raveendran Donald G Harbidge Ruchira Singh Philine Wangemann Daniel C Marcus 《BMC physiology》2010,10(1):1
Background
The low luminal Ca2+ concentration of mammalian endolymph in the inner ear is required for normal hearing and balance. We recently reported the expression of mRNA for a Ca2+-absorptive transport system in primary cultures of semicircular canal duct (SCCD) epithelium. 相似文献5.
Antonio Dobon Pilar Cordero Fatima Kreft Søren R. Østergaard Helle Antvorskov Mats Robertsson Maria Smolander Mercedes Hortal 《The International Journal of Life Cycle Assessment》2011,16(6):537-547
Purpose
This paper is the second part of a two-paper series dealing with the sustainability evaluation of a new communicative packaging concept. The communicative packaging concept includes a device that allows changing the expiry date of the product as function of temperature during transport and storage: a flexible best-before-date (FBBD). Such device was analysed in a consumer unit consisting of a nanoclay-based polylactic acid tray filled with pork chops. 相似文献6.
Chuan Ren Tingjian Chen Jingqing Zhang Ling Liang Zhanglin Lin 《Microbial cell factories》2009,8(1):66-9
Background
Xylose is a second most abundant sugar component of lignocellulose besides glucose. Efficient fermentation of xylose is important for the economics of biomass-based biorefineries. However, sugar mixtures are sequentially consumed in xylose co-fermentation with glucose due to carbon catabolite repression (CCR) in microorganisms. As xylose transmembrance transport is one of the steps repressed by CCR, it is therefore of interest to develop a transporter that is less sensitive to the glucose inhibition or CCR. 相似文献7.
Mohamad Hamdi Marco A Sanchez Lauren C Beene Qianyong Liu Scott M Landfear Barry P Rosen Zijuan Liu 《BMC molecular biology》2009,10(1):104
Background
Arsenic is one of the most ubiquitous toxins and endangers the health of tens of millions of humans worldwide. It is a mainly a water-borne contaminant. Inorganic trivalent arsenic (AsIII) is one of the major species that exists environmentally. The transport of AsIII has been studied in microbes, plants and mammals. Members of the aquaglyceroporin family have been shown to actively conduct AsIII and its organic metabolite, monomethylarsenite (MAsIII). However, the transport of AsIII and MAsIII in in any fish species has not been characterized. 相似文献8.
Esterina Fazio Pietro Medica Vincenzo Aronica Loredana Grasso Adriana Ferlazzo 《Acta veterinaria Scandinavica》2008,50(1):6
Background
Since transport evokes physiological adjustments that include endocrine responses, the objective of this study was to examine the responses of circulating β-endorphin, adrenocorticotrophic hormone (ACTH) and cortisol levels to transport stress in stallions. 相似文献9.
Chia-Cheng Li Tin-Yun Ho Chia-Hung Kao Shih-Lu Wu Ji-An Liang Chien-Yun Hsiang 《Journal of biomedical science》2010,17(1):89
Background
Sodium/iodide symporter (NIS) mediates the active transport and accumulation of iodide from the blood into the thyroid gland. His-226 located in the extracellular region of NIS has been demonstrated to be critical for iodide transport in our previous study. The conserved charged amino acid residues in the extracellular region of NIS were therefore characterized in this study. 相似文献10.
Kouroush Sadegh Zadeh Hubert J Montas Adel Shirmohammadi 《Theoretical biology & medical modelling》2006,3(1):36-19
Background
Quantification of in-vivo biomolecule mass transport and reaction rate parameters from experimental data obtained by Fluorescence Recovery after Photobleaching (FRAP) is becoming more important. 相似文献11.
Hong-Juan He Qian Wang Wei-Wei Zheng Jin-Xing Wang Qi-Sheng Song Xiao-Fan Zhao 《BMC cell biology》2010,11(1):1
Background
Nuclear transport factor 2 and small GTPase Ran participate in the nucleo-cytoplasm transport of macromolecules, but their function in the 20-hydroxyecdysone (20E) signal transduction pathway are not well known. 相似文献12.
Kouroush Sadegh Zadeh Howard C Elman Hubert J Montas Adel Shirmohammadi 《Biomedical engineering online》2007,6(1):24
Background
Biological mass transport processes determine the behavior and function of cells, regulate interactions between synthetic agents and recipient targets, and are key elements in the design and use of biosensors. Accurately predicting the outcomes of such processes is crucial to both enhancing our understanding of how these systems function, enabling the design of effective strategies to control their function, and verifying that engineered solutions perform according to plan. 相似文献13.
Background
The transport of intra-cellular particles by microtubules is a major biological function. Under appropriate in vitro conditions, microtubule preparations behave as a 'complex' system and show 'emergent' phenomena. In particular, they form dissipative structures that self-organise over macroscopic distances by a combination of reaction and diffusion. 相似文献14.
Kinesins and myosins transport cargos to specific locations along microtubules and actin filaments, respectively. The relative contribution of the two transport systems for cell polarization varies extensively in different cell types, with some cells relying exclusively on actin-based transport while others mainly use microtubules. Using fission yeast, we asked whether one transport system can substitute for the other. In this organism, microtubules and actin cables both contribute to polarized growth by transporting cargos to cell poles, but with distinct roles: microtubules transport landmarks to label cell poles for growth and actin assembly but do not directly contribute to the growth process [1]. Actin cables serve as tracks for myosin V delivery of growth vesicles to cell poles [
[2]
,
[3]
and
[4]
]. We engineered a chimera between the motor domain of the kinesin 7 Tea2 and the globular tail of the myosin V Myo52, which we show transports Ypt3, a myosin cargo receptor, to cell poles along microtubules. Remarkably, this chimera restores polarized growth and viability to cells lacking actin cables. It also bypasses the normal microtubule-dependent marking of cell poles for polarized growth, but not for other functions. Thus, a synthetic motor protein successfully redirects cargos along a distinct cytoskeletal route.
相似文献
Video Abstract
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Background
Investigation of bioheat transfer problems requires the evaluation of temporal and spatial distributions of temperature. This class of problems has been traditionally addressed using the Pennes bioheat equation. Transport of heat by conduction, and by temperature-dependent, spatially heterogeneous blood perfusion is modeled here using a transport lattice approach. 相似文献17.
Cláudia Echevenguá Teixeira Luciane Sartori Alexandra Rodrigues Finotti 《The International Journal of Life Cycle Assessment》2010,15(2):212-220
Background, aim, and scope
Semi-trailers with load boxes are the most important mode of grain transport by land in the world. Load boxes can be produced with different materials such as: wood, steel, and synthetic material. They are responsible for effectiveness retention and quality of grains during the transport. Among the main aspects to be considered and valued when selecting materials for load boxes are the final mass of the semi-trailer, loss of grains, and mechanical properties. Environmental performance is another important aspect to be taken into account for developing and selecting new materials in this kind of application. This study presents a comparative environmental evaluation of load boxes built from two different materials (a wood panel and a three-layer synthetic (TLS) panel). Mass balance and life cycle assessment (LCA) were used in this study. 相似文献18.
19.
Background and Aims
Imperforate tracheary elements (ITEs) in wood of vessel-bearing angiosperms may or may not transport water. Despite the significance of hydraulic transport for defining ITE types, the combination of cell structure with water transport visualization in planta has received little attention. This study provides a quantitative analysis of structural features associated with the conductive vs. non-conductive nature of ITEs.Methods
Visualization of water transport was studied in 15 angiosperm species by dye injection and cryo-scanning electron microscopy. Structural features of ITEs were examined using light and electron microscopy.Key Results
ITEs connected to each other by pit pairs with complete pit membranes contributed to water transport, while cells showing pit membranes with perforations up to 2 µm were hydraulically not functional. A close relationship was found between pit diameter and pit density, with both characters significantly higher in conductive than in non-conductive cells. In species with both conductive and non-conductive ITEs, a larger diameter was characteristic of the conductive cells. Water transport showed no apparent relationship with the length of ITEs and vessel grouping.Conclusions
The structure and density of pits between ITEs represent the main anatomical characters determining water transport. The pit membrane structure of ITEs provides a reliable, but practically challenging, criterion to determine their conductive status. It is suggested that the term tracheids should strictly be used for conductive ITEs, while fibre-tracheids and libriform fibres are non-conductive. 相似文献20.
Andrea Del Duce Marcel Gauch Hans-Jörg Althaus 《The International Journal of Life Cycle Assessment》2016,21(9):1314-1326