共查询到20条相似文献,搜索用时 15 毫秒
1.
Background
Translating a known metabolic network into a dynamic model requires rate laws for all chemical reactions. The mathematical expressions depend on the underlying enzymatic mechanism; they can become quite involved and may contain a large number of parameters. Rate laws and enzyme parameters are still unknown for most enzymes. 相似文献2.
Can B. Aktas Melissa M. Bilec 《The International Journal of Life Cycle Assessment》2012,17(3):362-371
Purpose
Service life of building products has an important influence on life cycle assessment (LCA) results of buildings. The goal of this study was to propose a systematic approach to estimate service life of building products by including both technical and social factors. 相似文献3.
Eugene V Koonin 《Biology direct》2007,2(1):15-21
Background
Recent developments in cosmology radically change the conception of the universe as well as the very notions of "probable" and "possible". The model of eternal inflation implies that all macroscopic histories permitted by laws of physics are repeated an infinite number of times in the infinite multiverse. In contrast to the traditional cosmological models of a single, finite universe, this worldview provides for the origin of an infinite number of complex systems by chance, even as the probability of complexity emerging in any given region of the multiverse is extremely low. This change in perspective has profound implications for the history of any phenomenon, and life on earth cannot be an exception. 相似文献4.
Alexei A Sharov 《Biology direct》2006,1(1):17-10
Background
The size of non-redundant functional genome can be an indicator of biological complexity of living organisms. Several positive feedback mechanisms including gene cooperation and duplication with subsequent specialization may result in the exponential growth of biological complexity in macro-evolution. 相似文献5.
Katarina Nilsson Anna Flysjö Jennifer Davis Sarah Sim Nicole Unger Simon Bell 《The International Journal of Life Cycle Assessment》2010,15(9):916-926
Purpose
The goal of the study was to compare the environmental impact of butter and margarine. Altogether, seven products were studied in three European markets: UK, Germany and France. 相似文献6.
Goal, Scope and Background
Waste associated with the manufacture, use, and disposal of electronic products, or e-waste, is a growing threat to the environment. IT procurement professionals can have a positive affect against that threat through careful consideration of the environmental awareness of their vendors. 相似文献7.
Background
The wealth of prokaryotic genomic data available has revealed that the histories of many genes are inconsistent, leading some to question the value of the tree of life hypothesis. It has been argued that a tree-like representation requires suppressing too much information, and that a more pluralistic approach is necessary for understanding prokaryotic evolution. We argue that trees may still be a useful representation for evolutionary histories in light of new data. 相似文献8.
Claudia Schiffczyk Barbara Romero Christina Jonas Constanze Lahmeyer Friedemann Müller Matthias W Riepe 《BMC neurology》2010,10(1):48
Background
Quality of life (QoL) is increasingly used to characterize the impact of disease and the efficacy of interventions. 相似文献9.
Consequential life cycle assessment: a review 总被引:1,自引:0,他引:1
J. Mason Earles Anthony Halog 《The International Journal of Life Cycle Assessment》2011,16(5):445-453
Purpose
Over the past two decades, consequential life cycle assessment (CLCA) has emerged as a modeling approach for capturing environmental impacts of product systems beyond physical relationships accounted for in attributional LCA (ALCA). Put simply, CLCA represents the convergence of LCA and economic modeling approaches. 相似文献10.
Background
It is common belief that all cellular life forms on earth have a common origin. This view is supported by the universality of the genetic code and the universal conservation of multiple genes, particularly those that encode key components of the translation system. A remarkable recent study claims to provide a formal, homology independent test of the Universal Common Ancestry hypothesis by comparing the ability of a common-ancestry model and a multiple-ancestry model to predict sequences of universally conserved proteins. 相似文献11.
Background
A key event in the origin of life on this planet has been formation of self-replicating RNA-type molecules, which were complex enough to undergo a Darwinian-type evolution (origin of the "RNA world"). However, so far there has been no explanation of how the first RNA-like biopolymers could originate and survive on the primordial Earth. 相似文献12.
Background
The RNA world hypothesis posits that the earliest genetic system consisted of informational RNA molecules that directed the synthesis of modestly functional RNA molecules. Further evidence suggests that it was within this RNA-based genetic system that life developed the ability to synthesize proteins by translating genetic code. Here we investigate the early development of the translation system through an evolutionary survey of protein architectures associated with modern translation. 相似文献13.
Markus Berger Matthias Finkbeiner 《The International Journal of Life Cycle Assessment》2011,16(1):74-81
Introduction
Even though the necessity of a sustainable use of natural resources is widely accepted, there is neither consensus on how “resource use” is clearly defined nor how it should be measured. Depending on the definition, it can comprise raw material consumption only or the consumption and pollution of natural resources. Consequently, lots of indicators can be applied, and the result of a life cycle assessment study aiming to quantify resource use seems to depend on the selection of impact categories. Therefore, this paper aims at analyzing life cycle impact assessment results obtained by means of several indicators to check if different indexes lead to similar results and if the number of indicators can be reduced. 相似文献14.
Ann Pa Jill S. Craven Xiaotao T. Bi Staffan Melin Shahab Sokhansanj 《The International Journal of Life Cycle Assessment》2012,17(2):220-231
Purpose
Environmental footprints of wood pellets produced in British Columbia (BC) of Canada are to be estimated based on industry surveys and published emission factor data. 相似文献15.
Background and Objective
Life cycle assessment (LCA) is a highly data intensive undertaking, where collecting the life cycle inventory (LCI) data is the most labour intensive part. The aim of this paper is to show a method for representing the LCI in a simplified manner which not only allows an estimative, quantitative LCA, but also the application of advanced analysis methods to LCA. 相似文献16.
A molecular timescale of eukaryote evolution and the rise of complex multicellular life 总被引:1,自引:0,他引:1
Background
The pattern and timing of the rise in complex multicellular life during Earth's history has not been established. Great disparity persists between the pattern suggested by the fossil record and that estimated by molecular clocks, especially for plants, animals, fungi, and the deepest branches of the eukaryote tree. Here, we used all available protein sequence data and molecular clock methods to place constraints on the increase in complexity through time. 相似文献17.
Claudia Schiffczyk Christina Jonas Constanze Lahmeyer Friedemann Müller Matthias W Riepe 《BMC neurology》2011,11(1):118
Background
Substituted judgment asks the proxy to decide what the patient would have decided, had he or she been competent. It is unclear whether substituted judgment of the patient's quality of life can serve as a surrogate measure in patients with dementia. 相似文献18.
Background
Cluster analysis is a crucial tool in several biological and medical studies dealing with microarray data. Such studies pose challenging statistical problems due to dimensionality issues, since the number of variables can be much higher than the number of observations. 相似文献19.
Andreas Jørgensen Agathe Le Bocq Liudmila Nazarkina Michael Hauschild 《The International Journal of Life Cycle Assessment》2008,13(2):96-103
Goal, Scope and Background
In recent years several different approaches towards Social Life Cycle Assessment (SLCA) have been developed. The purpose of this review is to compare these approaches in order to highlight methodological differences and general shortcomings. SLCA has several similarities with other social assessment tools, although, in order to limit the expanse of the review, only claims to address social impacts from an LCA-like framework are considered. 相似文献20.