排序方式: 共有30条查询结果,搜索用时 15 毫秒
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MicroRNA-mediated conversion of human fibroblasts to neurons 总被引:2,自引:0,他引:2
Yoo AS Sun AX Li L Shcheglovitov A Portmann T Li Y Lee-Messer C Dolmetsch RE Tsien RW Crabtree GR 《Nature》2011,476(7359):228-231
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In this paper we extend the plane blow-up results of Grundy& McLaughlin (1997) to the three-dimensional Navier-Stokes equations.Using a solution structure originally due to Lin we first providenumerical evidence for the existence of blow-up solutions on- < x, z < , 0 y 1 with boundary conditions on y = 0and y = 1 involving derivatives of the velocity components.The formulation enables us to consider plane and radial flowas special cases. Various features of the computations are isolatedand are used to construct a formal asymptotic solution closeto blow-up. We show that the numerical and asymptotic analysesprovide a mutually consistent global picture which supportsthe conclusion that, for the family of problems we considerhere, blow-up in fact can take place in three dimensions butat an inverse linear rate rather than the faster inverse squareof the plane case. 相似文献
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Ice nucleating-active Pseudomonas fluorescens F264C was fed to Colorado potato beetles to determine bacterial retentioin in the beetle gut and its effect on the cold hardiness of this insect pest. The bacrterium was present in beetles recovered after overwintering in the field, seven months after their exposure to P. fluorescens. Retention was evident not only in the detection of the P. fluorescens ice nucleating gene, inaW, in bacterial cultures from beetle guts but also in the elevated supercooling points of some treated beetles. 相似文献
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HARUN REŞIT YAZAR 《Pramana》2013,81(4):579-585
The sd-interacting boson approximation (sd-IBA) and the df-interacting boson approximation (df-IBA) can be related to each other and the states of the interacting boson approximation model can be identified with the fully symmetric states in the sdf interacting boson approximation model. A systematic study of the sdf-IBA model showed that the constructed Hamiltonian can successfully describe the strong octupole correlations in the deformed nuclei. We showed that the interacting boson approximation may account for many of these K π ?=?0+ states. It was found that the calculated energy spectra of the gadolinium isotopes agree quite well with the experimental data. The observed B(E2) values were also calculated and compared with the experimental data. 相似文献
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H. Dolmetsch 《Colloid and polymer science》1944,108(2-3):183-192
Zusammenfassung Das in vorhergehenden Berichten (l. c.) an Zellstoffasern mit üblichem Aufschlu?grad beschriebene Bauprinzip der Sekund?rwand
wurde nun an in der Entwicklung begriffenem und an ausgewachsenem Fichtenholz sowie an besonders schwach aufgeschlossenem
Fichtenzellstoff beobachtet.
Der Aufbau der Sekund?rschicht erfolgt in verschiedenen scharf getrennten Schichten, deren Konstruktion das Zustandekommen
der verschiedenen Spaltfl?chen sowie die einheitliche maximale Kettenl?nge der Zellulose gut erkl?rt.
Interessant ist besonders das Sichtbarwerden der Querspiralfl?chen in unbehandelten und ungequollenen L?ngsschnitten von Fichtensp?tholztracheiden
sowie die Tatsache, da? sich die Trennfl?chen dieser Flachspiralen nach der Nitrierung der Holzschnitte in organischen L?sungsmitteln
aufl?sen, w?hrend die eigentlichen Spiralg?nge infolge ihres Ligningehaltes ungel?st bleiben.
Die Beobachtung der schwach aufgeschlossenen Zellstoffe erm?glichte eine eingehende Untersuchung der prim?ren Membran und
lie? als Strukturelement derselben deutlich ausgepr?gte ligninreiche Kantenverdickungen in Form von L?ngsleisten erkennen,
mit deren Hilfe die Torsion der Fasern und dadurch entstandene, und also nur vorget?uschte Spiralwindungen im Queltungsbild
festgestellt werden k?nnen.
Die Beobachtung der Ver?nderung der einzelnen Strukturelemente nach Vornahme topochemischer Reaktionen gab Anhaltspunkte für
die Bestimmung des Baumaterials dieser Gebilde. 相似文献
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P. MORLIÉRE M. BAZIN L. DUBERTRET R. SANTUS T. SA E. MELO G. HÜPPE J. HAIGLE P. FORLOT A. BERNARD 《Photochemistry and photobiology》1991,53(1):13-19
5-Geranoxypsoralen, commonly called bergamottin, a major furocoumarin contained in bergamot oil, is reported in vitro as a highly photoreactive psoralen. In ethanol, it exhibits quite a high triplet state quantum yield (approximately 0.37). The triplet state is involved in subsequent photochemistry which depends on the initial concentration and on the presence of oxygen. In contrast to most psoralens, absorption and fluorescence data suggest that 5-geranoxypsoralen does not interact with DNA in the dark. No UVA-induced interstrand cross-links in DNA were shown. 相似文献
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ER Badman GE Patterson JM Wells RE Santini RG Cooks 《Journal of mass spectrometry : JMS》1999,34(8):889-894
Dual-detector differential non-destructive Fourier transform detection in a quadrupole ion trap is shown to improve signal intensity and reduce noise compared with spectra recorded using a single detector. A larger area detector in each end-cap electrode is machined to fit its hyperbolic shape and so minimize field imperfections on the z-axis. Argon, acetophenone and bromobenzene spectra were recorded to allow a comparison between single- and dual-detector (differential) modes of detection and to demonstrate the improvement achieved with differential detection. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
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Multidimensional residual distribution schemes for the convection–diffusion equation are described. Compact upwind cell vertex schemes are used for the discretization of the convective term. For the diffusive term, two approaches are compared: the classical finite element Galerkin formulation, which preserves the compactness of the stencil used for the convective part, and various residual-based approaches in which the diffusive term, evaluated after a reconstruction step, is upwinded along with the convective term. 相似文献
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