里氏木霉重组t-PA的酶性质的研究

利用分光光度计对里氏木霉重组t-PA的性质进行了研究,结果表明该酶对高温较为敏感,60℃酶完全失活;在pH6.4~7.6范围内,作用时间的长短对酶活力影响不大,保持较大的酶活;Zn2+和Fe3+离子对其有抑制的作用,Mg2+、Ca2+、Cu2+、Fe2+、Mn2+、Na+、K+对酶有激活的作用。     

Caryopsis morphology of the Chloridoideae (Gramineae) and its systematic implications

Macro- and micromorphological analysis of the caryopses of 58 taxa belonging to 45 genera of Chloridoideae allows the recognition of three caryopsis types according to differences in ventral face and hilum morphology. First is the convex ventral face, corresponding with a leaf-shaped hilum, observed in the tribe Pappophoreae. Second is the flat ventral face, corresponding with a rudimentary, needle-shaped or oblong hilum, observed in the tribes Eragrostideae and Leptureae. The third type, observed in the tribe Cynodonteae, is the concave ventral face, corresponding with a grooved or triangular hilum. The ventral face and hilum, together with other useful caryopsis characters, including six different shapes, seven types of spermoderm sculpture and three types of stylopodium, may be used as diagnostic characteristics of genera, and even species, in Chloridoideae. A key to identify the different species of 45 genera is provided.  © 2005 The Linnean Society of London, Botanical Journal of the Linnean Society , 2005, 148 , 57–72.     

Transgenic mice overexpressingγ-aminobutyric acid transporter subtypeⅠ develop obesity

INTRODUCTION7-aminobutyricacid(GABA)isthemajorinhibitoryneurotransmitterinthevertebratecelltralnervoussystemwhereitactingesavaxietyofGABAreceptortypes.TheneurotransmissionofGABAisthoughttobeterllilnatedbyit'srapidre-uptakeviaGABAtransportersintopresynapticneuronsandsurroundingglialcellsll,2].BesidesfUnctioningintheterminationofsynaptictransmission,GABAtransportersplayacriticalroleintheregUlationofthemagnitudeanddurationofGABA'sactionandmayajsomediatethereleaseofGABAintotheedrac…