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排序方式: 共有591条查询结果,搜索用时 46 毫秒
61.
Ed. Polenske 《Fresenius' Journal of Analytical Chemistry》1907,46(8):538-540
Ohne Zusammenfassung 相似文献
62.
Karl Dietrich Fritz Frank und Ed. Marckwald 《Fresenius' Journal of Analytical Chemistry》1919,58(6-7):296-301
Ohne Zusammenfassung 相似文献
63.
Ed. Wiltheiss 《Mathematische Annalen》1888,31(3):410-423
Ohne Zusammenfassung 相似文献
64.
Ed. Fabini und Hankó 《Fresenius' Journal of Analytical Chemistry》1892,31(1):198-199
Ohne Zusammenfassung 相似文献
65.
Ed Fredkin 《International Journal of Theoretical Physics》2003,42(2):145-145
66.
An improved version of the “pop-corn” model for baryon production in quark and gluon jets is presented. With a reduced number of parameters the model reproduces well both production rates for different baryon species and baryon momentum distributions. Predictions are presented for a set of baryon-antibaryon correlations. 相似文献
67.
Raphael Ed. Liesegang 《Colloid and polymer science》1928,45(2):112-114
Zusammenfassung Zur Aufdeckung der ?rtlichen W?rmeverteilungen in den nach J. Uri-Lloyd geb?nderten Flüssigkeiten lassen sich die Trübungen
benutzen, welche gewisse Alkaloide infolge der Alkalit?tszunahme einer Sulfitl?sung beim Erw?rmen annehmen. 相似文献
68.
Paweł Górnaś Inga Mišina Ilze Grāvīte Arianne Soliven Edīte Kaufmane Dalija Segliņa 《Natural product research》2015,29(13):1222-1227
Composition of tocochromanols in kernels recovered from 16 different apricot varieties (Prunus armeniaca L.) was studied. Three tocopherol (T) homologues, namely α, γ and δ, were quantified in all tested samples by an RP-HPLC/FLD method. The γ-T was the main tocopherol homologue identified in apricot kernels and constituted approximately 93% of total detected tocopherols. The RP-UPLC-ESI/MSn method detected trace amounts of two tocotrienol homologues α and γ in the apricot kernels. The concentration of individual tocopherol homologues in kernels of different apricots varieties, expressed in mg/100 g dwb, was in the following range: 1.38–4.41 (α-T), 42.48–73.27 (γ-T) and 0.77–2.09 (δ-T). Moreover, the ratio between individual tocopherol homologues α:γ:δ was nearly constant in all varieties and amounted to approximately 2:39:1. 相似文献
69.
Dai T Tegos GP St Denis TG Anderson D Sinofsky E Hamblin MR 《Photochemistry and photobiology》2011,87(1):250-255
Central venous catheters (CVC) are widely used in the United States and are associated with 250,000 to 500,000 CVC-related infections in hospitals annually. We used a catheter made from ultraviolet-C (UVC) transmissive material to test whether delivery of UVC from the lumen would allow inactivation of microorganisms on the outer surface of CVC. When the catheter was exposed to UVC irradiation from a cold cathode fluorescent lamp inside the catheter lumen at a radiant exposure of 3.6 mJ cm(-2) , more than 6-log(10) of drug-resistant Gram-positive bacteria adhered to the outer surface of the catheter were inactivated. Three to 7-log(10) of drug-resistant Gram-negative bacteria and 2.80-log(10) of fungi were inactivated at a radiant exposure of 11 mJ cm(-2).UVC irradiation also offered a highly selective inactivation of bacteria over keratinocytes under exactly comparable conditions. After 11 mJ cm(-2) UVC light had been delivered, over 6-log(10) of bacteria were inactivated while the viability loss of the keratinocytes was only about 57%. 相似文献
70.
Strotman NA Baxter CA Brands KM Cleator E Krska SW Reamer RA Wallace DJ Wright TJ 《Journal of the American Chemical Society》2011,133(21):8362-8371
The first example of an intramolecular asymmetric reductive amination of a dialkyl ketone with an aliphatic amine has been developed for the synthesis of Suvorexant (MK-4305), a potent dual Orexin antagonist under development for the treatment of sleep disorders. This challenging transformation is mediated by a novel Ru-based transfer hydrogenation catalyst that provides the desired diazepane ring in 97% yield and 94.5% ee. Mechanistic studies have revealed that CO(2), produced as a necessary byproduct of this transfer hydrogenation reaction, has pronounced effects on the efficiency of the Ru catalyst, the form of the amine product, and the kinetics of the transformation. A simple kinetic model explains how product inhibition by CO(2) leads to overall first-order kinetics, but yields an apparent zero-order dependence on initial substrate concentration. The deleterious effects of CO(2) on reaction rates and product isolation can be overcome by purging CO(2) from the system. Moreover, the rate of ketone hydrogenation can be greatly accelerated by purging of CO(2) or trapping with nucleophilic secondary amines. 相似文献