Xem 1-20 trên 116 kết quả Evolution of structure
  • (BQ) Ebook Earth Evolution of a habitable world is described in the context of what we know about other planets and the cosmos at large, from the origin of the cosmos to the processes that shape planetary environments and from the origins of life to the inner workings of cells. Astronomy, earth science, planetary science and astrobiology are integrated to give students the whole picture of how the Earth has come to its present state and an understanding of the relationship between key ideas in different fields.

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  • In response to the enactment by the U.S. Congress of the Intermodal Surface Transportation Efficiency Act (ISTEA), the Federal Highway Administration (FHWA) requested that the National Research Council (NRC) conduct a study on nonconventional concrete technology for renewal of the highway infrastructure. ISTEA directed the FHWA to initiate a comprehensive, long-range infrastructure research and development (R&D) program.

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  • The case of homologous monomeric c-type and oligomeric b-type crystallins has been described and analyzed in evolutionary terms. Data and hypotheses from molecular genetics and structural investigations converge and suggest a novel three-phase model for the evolutionary history of crystallin-type proteins. In the divergent cascades of monomeric and oligomeric crystallins, a pivotal role was played by alterations in the gene segments encoding the C-terminal extensions and the intermotif or interdomain linker peptides.

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  • The study of the formation and early evolution of stars has been an ever growing part of astrophysical research. Traditionally, often in the shadow of its big brothers (i.e., the study of stellar structure, stellar atmospheres and the structure of galaxies), it has become evident that early stellar evolution research contributes essentially to these classical fields. There are a few new items on the list of traditional astrophysical studies, some of which are more related to features known from the extreme late stages of stellar evolution.

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  • In this section we look at data concerning 10-year government bond yields. Although our main interest is the default risk, this presents only one channel through which fiscal policies can affect long-term yields. There are other channels operating through monetary-fiscal interaction, which should be reflected in the evolution of yields. Therefore we start our descriptive analysis in this section by looking at yields, forward rates and inflation expectations at a weekly frequency. Then we move to an analysis of interest rate swap spreads, at a weekly and daily frequency.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Structural evolution of GeMn/Ge superlattices grown by molecular beam epitaxy under different growth

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  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Structural evolution of GeMn/Ge superlattices grown by molecular beam epitaxy under different growth conditions

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  • Soon after the first sequences of proteins and nucleic acids became available for comparative analysis, it became apparent that they can play a key role for reconstructing the evolution of life. The availability of the sequence of several proteins prompted the birth of the field of molecular evolution, which aims at both the reconstruction of the biochemical history of life and the understanding of the mechanisms of evolution at the molecular level through the analysis of the macromolecules of existing organisms.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Structure, expression differentiation and evolution of duplicated fiber developmental genes in Gossypium barbadense and G. hirsutum

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Evolution of the rpoB-psbZ region in fern plastid genomes: notable structural rearrangements and highly variable intergenic spacers

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  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : Structural evolution of GeMn/Ge superlattices grown by molecular beam epitaxy under different growth

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Evolution of Wurtzite Structured GaAs Shells Around InAs Nanowire Cores

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  • Since the time of Newton the basic structure of the solar system and the laws that govern the motions of the bodies within it have been well understood. One central body, the Sun, containing most of the mass of the system has a family of attendant planets in more-or-less circular orbits about it. In their turn some of the planets have accompanying satellites, including the Earth with its single satellite, the Moon. With improvements in telescope technology, and more recently through space research, knowledge of the solar system has grown apace.

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  • In contrast, privately held firms have relatively concentrated ownership structures and hence can efficiently communicate among shareholders information via private channels. Therefore, financial information and reported earnings are less important in communicating firm performance, which in turn makes private firms less likely to expend resources (e.g., hiring a high quality auditor) to produce earnings that are highly informative about economic performance.4 Moreover, reported earnings can assume a different role than for public firms.

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  • The main mechanisms shaping the modular evolution of proteins are gene duplication, fusion and fission, recombination and loss of frag-ments. While a large body of research has focused on duplications and fusions, we concentrated, in this study, on how domains are lost.

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  • Crustacean hyperglycemic hormone (CHH) and vitellogenesis-inhibiting hormone (VIH), produced by the X organ–sinus gland neurosecretory com-plex, belong to a peptide group referred to as the CHH family, which is widely distributed in arthropods. In this study, genetic variants and post-translationally modified isoforms of CHH and VIH were characterized in the European lobster Homarus gammarus.

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  • Foundation building is neither picturesque nor especially interesting, but it is indispensable. However fair the structure is to be, one must first lay the rough-hewn stones upon which it is to rest. It would be much pleasanter in this sketch to display at once the minarets and towers, and stained-glass windows; but that can only be done when one's castle is in Spain. Would we comprehend the Germany of to-day, we must hold firmly in our minds an epitome of what it has been, and see vividly the devious path of its development through the ages.

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  • Previous preparations of the Na + F1F0-ATP synthase solubilized by Triton X-100 lacked some of the membrane-embedded motor subunits [Reidlinger J&Mu¨ller V (1994) Eur J Biochem233, 275–283]. To improve the subunit recovery, we revised our purification protocol. The ATP synthase was solu-bilized with dodecylmaltoside and further purified to apparent homogeneity by chromatographic techniques.

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  • L-Arabinitol 4-dehydrogenase (Lad1) of the cellulolytic and hemicellulolytic fungusHypocrea jecorina(anamorph: Trichoderma reesei) has been implicated in the catabolism ofL-arabinose, and genetic evidence also shows that it is involved in the catabolism of D-xylose in xylitol dehydrogenase (xdh1) mutants and of D-galactose in galactokinase (gal1) mutants of H. jecorina.In order to identify the substrate specificity of Lad1, we have recombinantly produced the enzyme inEscherichia coliand purified it to physical homogeneity....

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  • We purified pancreatic deoxyribonuclease I (DNase I) from the shark Heterodontus japonicususing three-step column chromatography. Although its enzymatic properties resem-bled those of other vertebrateDNases I, sharkDNase I was unique inbeingabasicprotein.Full-lengthcDNAs encoding theDNases I of two shark species,H. japonicusandTriakis scyllia, were constructed from their total pancreatic RNAs using RACE.

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