10,000 publications from this institution
A micro-mechanistic understanding of bone fracture that encompasses how cracks interact with the underlying microstructure and defines their local failure mode is lacking, despite extensive research n the response of bone to a variety of factors like aging, loading, and/or disease.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBase-Free Silylene Complexes without .pi.-Donor Stabilization. Molecular Structure of [Cp*(PMe3)2Ru:SiMe2][B(C6F5)4]Steven K. Grumbine, T. Don Tilley, Frederick P. Arnold, and Arnold L. RheingoldCite this: J. Am. Chem. Soc. 1994, 116, 12, 5495–5496Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://doi.org/10.1021/ja00091a074RIGHTS & PERMISSIONSArticle Views387Altmetric-Citations100LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (265 KB) Get e-AlertsSupporting Info (2)»Supporting Information Supporting Information Get e-Alerts
Three metalorganic complex arrays (MOCAs) with a specific sequence of metal centers as well as that of amino acid units were synthesized. These MOCAs are also isomers exhibiting a gelation capability dependent on the location of the metal complexes in the arrays.
The warm season (mid‐June through late August) partitioning between sensible ( H ) and latent ( LE ) heat flux, or the Bowen ratio (β = H / LE ), was investigated at 27 sites over 66 site years within the international network of eddy covariance sites (FLUXNET). Variability in β across ecosystems and climates was analyzed by quantifying general climatic and surface characteristics that control flux partitioning. The climatic control on β was quantified using the climatological resistance ( R i ), which is proportional to the ratio of vapor pressure deficit (difference between saturation vapor pressure and atmospheric vapor pressure) to net radiation (large values of R i decrease β). The control of flux partitioning by the vegetation and underlying surface was quantified by computing the surface resistance to water vapor transport ( R c , with large values tending to increase β). There was a considerable range in flux partitioning characteristics ( R c , R i and β) among sites, but it was possible to define some general differences between vegetation types and climates. Deciduous forest sites and the agricultural site had the lowest values of R c and β (0.25–0.50). Coniferous forests typically had a larger R c and higher β (typically between 0.50 and 1.00 but also much larger). However, there was notable variability in R c and R i between coniferous site years, most notably differences between oceanic and continental climates and sites with a distinct dry summer season (Mediterranean climate). Sites with Mediterranean climates generally had the highest net radiation, R c , R i , and β. There was considerable variability in β between grassland site years, primarily the result of interannual differences in soil water content and R c .
Abstract Das nach einem einfachen 4‐Stufen‐Verfahren dargestellte Polystyrolboronsäure‐Harz (II) wird bei der Acylierung der α‐L‐Rhamncpyranoside (IV) verwendet.
No abstract is provided for this article.
Two types of insoluble polystyrene resins bearing vinylbenzaldehyde units have been prepared and used with high efficiency as temporary protecting groups in the synthesis of 2,3 disubstituted derivatives of methyl α-D-glucopyranoside.
The functionalization of C-H bonds has created new approaches to preparing organic molecules by enabling new strategic "disconnections" during the planning of a synthetic route. Such functionalizations also have created the ability to derivatize complex molecules by modifying one or more of the many C-H bonds. For these reasons, researchers are developing new types of functionalization reactions of C-H bonds and new applications of these processes. These C-H bond functionalization reactions can be divided into two general classes: those directed by coordination to an existing functional group prior to the cleavage of the C-H bond (directed) and those occurring without coordination prior to cleavage of the C-H bond (undirected). The undirected functionalizations of C-H bonds are much less common and more challenging to develop than the directed reactions. This outlook will focus on undirected C-H bond functionalization, as well as related reactions that occur by a noncovalent association of the catalyst prior to C-H bond cleavage. The inherent challenges of conducting undirected functionalizations of C-H bonds and the methods for undirected functionalization that are being developed will be presented, along with the factors that govern selectivity in these reactions. Finally, this outlook discusses future directions for research on undirected C-H functionalization, with an emphasis on the limitations that must be overcome if this type of methodology is to become widely used in academia and in industry.
