l-序列的采样元素分布及k-错线性复杂度

证明了极大周期FCSR序列的任意采样序列在一个周期内0,1元素分布几乎平衡,利用这一分布性质研究了连接数为强2-素数的l-序列的k-错线性复杂度,结果显示这类l-序列具有非常稳定的线性复杂度。

Localization of Na+-K+ ATPases in Quasi-Native Cell Membranes

Na+-K+ ATPases have been observed and located by in situ AFM and single molecule recognition technique, topography and recognition imaging (TREC) that is a unique technique to specifically identify single protein in complex during AFM imaging. Na+-K+ ATPases were well distributed in the inner leaflet of cell membranes with about 10% aggregations in total recognized proteins. The height of Na+-K+ ATPases measured by AFM is in the range of 12-14 nm, which is very consistent with the cryoelectron microscopy result. The unbinding force between Na+-K+ ATPases in the membrane and anti-ATPases on the AFM tip is about 80 pN with the apparent loading rate at 40 nN/s.

Phase diagram data for several salt plus salt aqueous biphasic systems at 298.15 K

Phase diagrams corresponding to aqueous biphasic systems of salt (the organic ionic liquid of salts [C(4)mim]Cl, [C(6)mim]Cl, and [C(8)mim]Cl) + salt (K3PO4, K2CO3) + water were determined at 298.15 K. The binodal curve was fitted to the Merchuk equation. Tie lines assigned from mass phase ratios according to the lever arm rule were satisfactorily described using the Othmer-Tobias and Bancroft equations.

空气中合成M_2B_4O_7∶Eu~(3+)(M=Na,K)荧光体及其性质表征

以 M2 B4 O7( M=Na,K)为基质 ,在空气中掺杂稀土元素 Eu3+ 得到了 Na2 B4 O7∶ Eu3+ 和 K2 B4 O7∶ Eu3+荧光体 .探讨了体系的烧结条件和荧光性质 ,分析了晶体的结构 .结果表明 ,虽然两种体系的最佳合成条件不同 ,但是体系中都同时存在 [BO4 ]和 [BO3]结构 ;稀土离子 Eu3+ 的发光以电偶极跃迁5D0 -7F2 为主 ,处于非中心对称的格位上 ,并且可以很好地存在于基质中 ,Na2 B4 O7∶Eu3+ 具有较强的发光强度

Gadolinium heteropoly complex K-17[Gd(P2W17O61)(2)] as a potential MRI contrast agent

Gadolinium heteropoly complex K-17[Gd(P2W17O61)(2)] has been evaluated by in vitro and in vivo experiments as a potential contrast agent for magnetic resonance imaging (MRI). The thermal analysis and conductivity study indicate that this complex has good thermal stability and wide pH stability range. The T-1 relaxivity is 7.59 mM(-1) s(-1) in aqueous solution and 7.97 mM(-1) s(-1) in 0.725 mmol l(-1) bovine serum albumin (BSA) solution at 25degreesC and 9.39 T, respectively. MR imaging of three male Sprague-Dawley rats showed remarkable enhancement in rat liver after intravenous injection, which persisted longer than with Gd-DTPA. The signal intensity increased by 57.1 +/- 16.9% during the whole imaging period at 0.082 mmol kg(-1) dose. Our preliminary in vitro and in vivo studies indicate that K-17[Gd(P2W17O61)(2)] is a potential liver-specific MRI contrast agent.

超细Mo-Co-K催化剂的制备及其选区电子衍射表征

中国科学院山西煤炭化学研究所