Home About us Contact
|
Home About us Contact | ||
|
|
||
Rapid Construction (rapid + construction)
Selected AbstractsStudies Directed Toward the Synthesis of Terreulactone A: Rapid Construction of the A, B, C Rings.CHEMINFORM, Issue 24 2006Haibo Liu Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] A One-Pot Non-Aldol,Aldol Vinylogous Mukaiyama Aldol Tandem Sequence for the Rapid Construction of Polyketide Frameworks.CHEMINFORM, Issue 31 2005Nicola Rahn Abstract For Abstract see ChemInform Abstract in Full Text. [source] Truncated Diastereoselective Passerini Reaction, a Rapid Construction of Polysubstituted Oxazole and Peptides Having an ,-Hydroxy-,-amino Acid Component.CHEMINFORM, Issue 38 2004Guylaine Cuny Abstract For Abstract see ChemInform Abstract in Full Text. [source] GLOBALIZATION AND EXTERRITORIALITY IN METROPOLITAN CAIROGEOGRAPHICAL REVIEW, Issue 3 2005PETRA KUPPINGER ABSTRACT. Rapid construction of new spaces like hotels, malls, private clubs, and gated communities in Greater Cairo, Egypt produces structures disconnected spatially and conceptually from most of the existing urban fabric. Their spatial concepts and practices, as well as architectural forms and expertise, are based largely on globally available models. Planning and construction are guided by the search for security in the face of real or imagined fear of the urban masses and political upheaval. Concrete walls, guarded entrances, and high-tech security technology bear witness to these fears. Analysis of the Mena House Hotel, the Grand Egyptian Museum project, and the First Mall in Giza shows how these projects globalize Cairo and localize the global. Often these globalized spaces are remade by creating local and regional ties and design features that were not anticipated by the planners. Such changes shed light on underlying dynamics and contribute to a better understanding of in situ globalization. Whereas their physical features tend to accentuate their globalized nature, these spaces do not exist in isolation from their geographical and cultural contexts. Their everyday realities tell tales of reterritorialization that are frequently overlooked in scholarly debates. [source] Micromorphology of Cotiga Mound, West VirginiaGEOARCHAEOLOGY: AN INTERNATIONAL JOURNAL, Issue 6 2005D.L. Cremeens Micromorphology samples from Cotiga Mound (ca. 2100 yr B.P.) reveal distinct microstructures associated with mound construction and post-construction pedogenesis of the mound materials. The interface between layers of basketloads displays sharp, irregular contacts with little to no evidence of pedoturbation, suggesting rapid construction. Evidence of clay and iron translocation, along with well-preserved charcoal fragments containing identifiable cell structure, were observed in samples collected from hearth features. Both the prepared surface and associated central burial feature at the base of the mound have a complex microstructure, characterized by charcoal layers and zones of clay accumulation, along with microstratification in the prepared surface. Clay translocation, formation of a complex void network, and ironmanganese accumulation were the dominant pedogenic processes that modified the completed mound. © 2005 Wiley Periodicals, Inc. [source] Asymmetric Synthesis of Maraviroc (UK-427,857)ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 13 2010Gui-Ling Zhao Abstract The asymmetric synthesis of Maraviroc (UK-427,857), a chemochine receptor 5 (CCR-5) receptor antagonist, based on an expeditious organocatalytic enantioselective assembly of the chiral ,-amino aldehyde key fragment is presented. The reactions were performed on a gram-scale and allow for the rapid construction of new Maraviroc analogues. [source] Predicting the unexpected: using a qualitative model of a New Zealand dryland ecosystem to anticipate pest management outcomesAUSTRAL ECOLOGY, Issue 4 2009DAVID S. L. RAMSEY Abstract Pest management is expensive and there is often uncertainty about the benefits for the resources being protected. There can also be unintended consequences for other parts of the ecosystem, especially in complex food webs. In making decisions managers generally have to rely on qualitative information collected in a piecemeal fashion. A method to assist decision making is a qualitative modelling approach using fuzzy cognitive maps, a directed graphical model related to neural networks that can take account of interactions between pests and conservation assets in complex food webs. Using all available information on relationships between native and exotic resources and consumers, we generated hypotheses about potential consequences of single-species and multi-species pest control on the long-term equilibrium abundances of other biotic components of an ecosystem. We applied the model to a dryland ecosystem in New Zealand because we had good information on its trophic structure, but the information on the strength of species interactions was imprecise. Our model suggested that pest control is unlikely to significantly boost native invertebrates and lizards in this ecosystem, suggesting that other forms of management may be required for these groups. Most of the pest control regimes tested resulted in greater abundances of at least one other pest species, which could potentially lead to other management problems. Some of the predictions were unexpected, such as more birds resulting from possum and mouse control. We also modelled the effects of an increase in invasive rabbits, which led to unexpected declines of stoats, weasels, mice and possums. These unexpected outcomes resulted from complex indirect pathways in the food web. Fuzzy cognitive maps allow rapid construction of prototype models of complex food webs using a wide range of data and expert opinion. Their utility lies in providing direction for future monitoring efforts and generating hypotheses that can be tested with field experiments. [source] Asymmetric Synthetic Access to the Hetisine Alkaloids: Total Synthesis of (+)-NominineCHEMISTRY - A EUROPEAN JOURNAL, Issue 5 2008Kevin Abstract A dual cycloaddition strategy for the synthesis of the hetisine alkaloids has been developed, illustrated by a concise asymmetric total synthesis of (+)-nominine (7). The approach relies on an early-stage intramolecular 1,3-dipolar cycloaddition of a 4-oxido-isoquinolinium betaine dipole with an ene,nitrile dipolarophile. Subsequent late-stage pyrrolidine-induced dienamine isomerization/Diels,Alder cascade allows for rapid construction of the carbonnitrogen polycyclic skeleton within this class of C20 -diterpenoid alkaloids. [source] Total Synthesis of Ouabagenin and OuabainCHEMISTRY - AN ASIAN JOURNAL, Issue 5 2009Maddi, Sridhar Reddy Dr. Abstract All done! A full account of the total synthesis of ouabagenin and ouabain has been described. The synthesis was achieved through a polyanionic cyclization strategy. Degradation studies provide an ultimate proof for a key intermediate observed in the synthesis. A full account of the total synthesis of ouabagenin and ouabain is described. A highly stereocontrolled anionic cycloaddition for the rapid construction of the basic steroid skeleton is a pivotal conversion for the whole strategy. A careful study was needed to establish the order and the sequence of functional group manipulations. Specific conformational features of the ouabain skeleton allowed us to overcome a few stereochemical problems. Degradation studies on ouabain provided an ultimate proof for a key intermediate, which is used as a relay. Late stage butenolide formation and glycosidation yielded ouabain. [source] | ||||||||||||||||||||||