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61.
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The condensation of substituted allylsiloxanes with aldehydes leads to the highly stereoselective construction of 2,3,4,5-tetrasubstituted tetrahydrofurans. With electron-rich aryl and alpha,beta-unsaturated aldehydes as substrates, the stereochemical outcome at C5 can be dictated by appropriate choice of Lewis acid. The reaction has been applied to a concise (nine step) synthesis of (+)-virgatusin (ent-1). [reaction: see text] 相似文献
64.
Inverted colloidal crystals as three-dimensional cell scaffolds 总被引:1,自引:0,他引:1
Kotov NA Liu Y Wang S Cumming C Eghtedari M Vargas G Motamedi M Nichols J Cortiella J 《Langmuir : the ACS journal of surfaces and colloids》2004,20(19):7887-7892
A new type of three-dimensional scaffold with inverted colloidal crystal geometry for the investigation of topological effects in cell cultures is introduced in this publication. The scaffolds are made by infiltration of the hexagonal crystal lattice of polystyrene spheres with sol-gel formulation and subsequent annealing. It possesses a relatively high degree of order among existing cell scaffolds and affords tight control over the scaffold porosity and tissue organization. The prepared scaffolds can be a convenient system for the investigation of cell-cell and cell-matrix interactions. Their biocompatibility is demonstrated for human hepatocellular carcinoma HEP G2 and human bone marrow HS-5 cell cultures. A preliminary effect of the scaffold topology on cell proliferation is observed. HEP G2 hepatocytes form a large number of 10-15 cell colonies on scaffolds made from 75-microm spheres, while their number diminishes for scaffolds from 10- and 160-microm spheres. Under similar conditions, HS-5 forms smaller colonies consisting of three to four cells in 90-microm cavities. 相似文献
65.
A viscose-rayon-based activated carbon cloth (ACC) was electrochemically oxidized to enhance its cation sorption capacity for comparison with as-received ACC. The ACCs were characterized by sodium capacity measurement, pH titration, zeta potential measurement, elemental analysis, Brunauer-Emmet-Teller surface area, and pore size distribution. Batch sorption experiments showed that electrochemically oxidized ACC (EO) is more effective for the removal of lead and copper ions compared to unoxidized ACC (UO) for both competitive and noncompetitive sorption. For electrochemically oxidized fibers the copper and lead sorption capacities of ACC increased 17 and 4 times, respectively, for noncompetitive sorption and 8.8 and 8.6 times, respectively, for competitive sorption. However, reduction in the sorption capacities for both metals was observed for the competitive sorption. The sorption of lead and copper onto EO was by ion exchange, while that onto UO was likely to be due to surface complex formation. The affinity order of the two metal ions sorbed by UO and EO is Pb(2+)>Cu(2+). The effect of pH on sorption isotherms indicated that metal uptake increased with an increase in solution pH. 相似文献
66.
Ohne Zusammenfassung 相似文献
67.
68.
W.M. Cumming 《Fresenius' Journal of Analytical Chemistry》1925,66(4-5):173-174
Ohne Zusammenfassung 相似文献
69.
Earl M. Anger K. Schröder R. E. Lowe M. A. Mammen L. R. Taylor R. H. Griffith G. C. Holliday H. E. Roscoe F. Scudder H. Bunte E. Terres A. Mittasch W. M. Cumming W. Good und P. Budnikoff 《Fresenius' Journal of Analytical Chemistry》1929,78(7-8):305-315
Ohne Zusammenfassung 相似文献
70.
J. H. Stansbie E. Gilchrist A. Ch. Cumming J. R. Withrow Arthur J. White R. Belasio M. Marchionneschi Ch. Lind W. D. Treadwell A. Sieverts W. Wippelmann H. Graefe Geo Kemerer E. B. Spear S. S. Strahan C. B. Spear E. E. Tainton A. Mazzuchelli B. L. Murray E. P. Schoch F. M. Crawford und John H. Reedy 《Fresenius' Journal of Analytical Chemistry》1917,56(5):246-253
Ohne Zusammenfassung 相似文献