排序方式: 共有29条查询结果,搜索用时 31 毫秒
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William T. Speck Amy J. Behrman Pnina G. Rosenkranz Doria Gordon Herbert S. Rosenkranz 《Photochemistry and photobiology》1980,31(5):513-517
Abstract— The unfertilized oocytes and spermatozoa of the American sea urchin ( Arbacia punctulata ) were exposed to phototherapy lights in order to determine the effect of this treatment regimen on post-irradiation fertilization and embryonic development. Light treatment revealed dose-dependent abnormalities in fertilization and subsequent embryonic development. 相似文献
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E. J. Behrman 《合成通讯》2013,43(9):1455-1456
Inability to reproduce the results of Ref. 1 is reported. 相似文献
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A. S. Behrman 《Fresenius' Journal of Analytical Chemistry》1923,62(5):206
Ohne Zusammenfassung 相似文献
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James Hendrick G. Weissenberger J. Johnston Richards und A. S. Behrman 《Fresenius' Journal of Analytical Chemistry》1918,57(3):150-152
Ohne Zusammenfassung 相似文献
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Sean R. Parkin Edward J. Behrman 《Acta Crystallographica. Section C, Structural Chemistry》2011,67(8):o324-o328
Crystals of 5‐hydroxy‐6‐methyl‐2‐pyridone, (I), grown from a variety of solvents, are invariably trigonal (space group R); these are 5‐hydroxy‐6‐methyl‐2‐pyridone acetone 0.1667‐solvate, C6H7NO2·0.1667C3H6O, (Ia), and 6‐methyl‐5‐hydroxy‐2‐pyridone propan‐2‐ol 0.1667‐solvate, C6H7NO2·0.1667C3H8O, (Ib), and the forms from methanol, (Ic), water, (Id), benzonitrile, (Ie), and benzyl alcohol, (If). They incorporate channels running the length of the c axis that contain extensively disordered solvent molecules. A solvent‐free sublimed powder of 5‐hydroxy‐6‐methyl‐2‐pyridone microcrystals is essentially isostructural. Inversion‐related host molecules interact via pairs of N—H...O hydrogen bonds to form R22(8) dimers. Six of these dimers form large R126(42) puckered rings, in which the O atom of each N—H...O hydrogen bond is also the acceptor in an O—H...O hydrogen bond that involves the 5‐hydroxy group. The large R126(42) rings straddle the axes and form stacked columns viaπ–π interactions between inversion‐related molecules of (I) [mean interplanar spacing = 3.254 Å and ring centroid–centroid distance = 3.688 (2) Å]. The channels are lined by methyl groups, which all point inwards to the centre of the channels. 相似文献
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