1.55μm波长发光的自组织InAs量子点生长

通过引入较长停顿时间，采用分子束外延循环生长方法在350℃低温获得了一种横向聚合的InAs自组织量子点，在荧光光谱中观察到1.55μm波长的发光峰。通过AFM和PL谱的联合研究，表明此低温循环生长方法有利于在长波长发光的量子点的形成。

2.6 s isomer of Nd-129

Nd-129 was produced by irradiation of an enriched target of Ru-96 with a Ar-36 beam and studied by using a helium-jet fast tape transport system in combination with X-gamma and gamma-gamma coincidence measurements. A 2.6s isomer of Nd-129 was observed for the first time and tentatively proposed to be the configuration of 1/2[411].

Metal dependent control of cis-/trans-1,4 regioselectivity in 1,3-butadiene polymerization catalyzed by transition metal complexes supported by 2,6-bis[1-(iminophenyl)ethyl]pyridine

Fe(III), Cr(III), Fe(II), Co(II) and Ni(II) chloride complexes supported by 2,6-bis[1-(iminophenyl)ethyl]pyridine have been synthesized and characterized along with single crystal X-ray diffraction. These complexes, in combination with MAO, have been examined in butadiene polymerization. The catalytic activity and regioselectivity are strongly controlled by metal center and cocatalyst (MAO/Co ratio dependent in the case of Co(II) complex). The activity decreases in the order of Fe(III) > Co(II) > Cr(III) approximate to Ni (II) complexes, in consistent with the space around the metal center. Polybutadiene with different microstructure content, from high trans-1,4 units (88-95% for iron(III) and Cr(III)), medium trans-1,4 and cis-1,4 units (55% and 35%, respectively, for iron(II)) to high cis-1,4 units 79% for Co(II) and 97% for Ni(II) call be easily achieved by varying of the metal center.

聚氯乙烯-尼龙6树脂富集差示光度法测定金

采用聚氯乙烯尼龙６树脂分离富集溶解于王水金精矿样品中的金，然后用亚硫酸钠和碘化钾的混合溶液洗脱，并用硫代米氏酮显色，同时将普通光度法、差示光度法以及稀释有色溶液的差示光度法结合起来进行测定。通过标样验证，结果令人满意。

η~6—芳烃希土有机配合物的合成、结构及性能研究——Ⅰ.Sm(η~6—C_6H_6)(AlCl_4)_3的合成及晶体结构

经过铝粉加热活化的AlCl_3与SmCl_3在苯中反应,得到了Sm(η~6—C_6H_6)(AlCl_4)_3·C_6H_6单晶.其晶体属于三斜晶系,P1空间群,晶胞参数a=9.456(2)(?),b=9.765(3)(?),c=16.776(4)(?),α=96.00(2)°,β=93.76(2)°,γ=111.66(2)°,V=1422.55(?)~3,Z=2.晶体结构是采用Patterson和Fourier合成法解出的,所有非氢原子的坐标及各向异性热振动参数经块矩阵最小二乘法修正,最后偏离因子R=0.031,R_ω=0.035.分子结构中,中心离子Sm(Ⅲ)与六个Cl原子及一个苯环上的六个C原子成键.Sm-C键平均距离2.92(?),Sm-Cl平均距离2.83(?).与希土相连的六个Cl原子,其中之五构成平面五边形,整个分子呈大致的五角双锥形.

Purification and characterization of agarases from a marine bacterium Vibrio sp. F-6

Marine bacterium Vibrio sp. F-6, utilizing agarose as a carbon source to produce agarases, was isolated from seawater samples taken from Qingdao, China. Two agarases (AG-a and AG-b) were purified to a homogeneity from the cultural supernatant of Vibrio sp. F-6 through ammonium sulfate precipitation, Q-Sepharose FF chromatography, and Sephacryl S-100 gel filtration. Molecular weights of agarases were estimated to be 54.0 kDa (AG-a) and 34.5 kDa (AG-b) by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The optimum pH values for AG-a and AG-b were about 7.0 and 9.0, respectively. AG-a was stable in the pH range of 4.0-9.0 and AG-b was stable in the pH range of 4.0-10.0. The optimum temperatures of AG-a and AG-b were 40 and 55 degrees C, respectively. AG-a was stable at temperature below 50 degrees C. AG-b was stable at temperature below 60 degrees C. Zn2+, Mg2+ or Ca2+ increased AG-a activity, while Mn2+, Cu2+ or Ca2+ increased AG-b activity. However, Ag+, Hg2+, Fe3+, EDTA and SDS inhibited AG-a and AG-b activities. The main hydrolysates of agarose by AG-a were neoagarotetraose and neoagarohexaose. The main hydrolysates of agarose by AG-b were neoagarooctaose and neoagarohexaose. When the mixture of AG-a and AG-b were used, agarose was mainly degraded into neoagarobiose.

HPLC测定四川及青海地区獐牙菜植物中6种主要成分的含量

目的:建立反相高效液相色谱法同时测定四川及青海地区部分獐牙菜中獐牙菜苦苷、龙胆苦苷、芒果苷、当药醇苷、异荭草苷、1,8-二羟基-3-甲氧基(口山)酮的含量.方法:采用RP-HPLC,使用Kromasil C_(18)(4.6 mm×250mm,5 μm)柱;流动相甲醇-水(含0.02%磷酸);梯度洗脱程序为0～50 min,甲醇的体积分数(下同)由20%上升至80%;50～55 min由80%增至100%,55～60 min为100%,流速1 mL•min~(-1),检测波长254 nm;柱温35 ℃.结果:6种成分均达到基线分离,线性良好.结论:该方法快速、准确、重复性好,为该类药材的入药提供了理论依据.

国产6种点地梅属植物的核型及其系统学意义

报道了点地梅属6种12个居群的染色体数目和核型。它们的染色体数目（2n）、核型公式（KF）、染色体相对长度组成（CRL）、核型不对称性系数（A. sK％）和核型类型（KT）分别为：点地梅在南京的2个居群都是2n=2x=20，KF=18m+2sm, CRL=2L+6M_2+10M_1+2S，核型KT属于1A型，但核型不对称性系数As. K％分别是55.04％和56.71％；北点地梅在内蒙古锡林郭勒和白音锡勒居群的2n=2x=20，KF分别为16m+2sm+2st+1b和16m+2sm+2st+4b，染色体相对长度组成分别是14M_2+4M_1+2S+1b和12M_2+6M_1+2S+4b，核型不对称性系数As. K％分别是57.65％和58.86％，属2A型和2B型；高原点地梅在青海玛沁县昌马河居群和兴海县温泉居群都是2n=2x=20，KF=10m+8sm+2st。但相对长度组成分别为12M_2+8M_1和4L+6M_2+6M_1+4S, As. K％分别是60.35％和62.57％，属2A型和2B型；雅江点地梅在青海玛多县巴颜喀拉山居群和大通县达坡山居群分别为2n=4x=40和20n=6x=60，KF=36m+2sm+2st和KF=46m+10sm+4st+2b, CRL=2l+20M_2+14M_1+4S和GRL=6L+30M_2+16M_1+8S+2b, As.K％分别为55.62％和58.31％，核型均属于2B；巴颜喀拉山北坡的鳞叶点地梅2n=40、60、80。西藏点地梅青湖居群中有2种细胞型：①2n=2x=24, KF=12m+6sm+6st+4b, CRL=6L+2M_2+8M_1+4S+4b, As. K％＝65.74％，核型属2B；②2n=2x=22,KF=14m+4sm(2SAT)+4st, CRL=4L+6M_2+8M_1(2SAT)+4S,As. K％=63.40％，核型也属于2B。西宁西山湾居群也有2种细胞型；①2n=3x=36, KF=36m,CRL=4L+12M_2+20M_1, As. K％=54.82％，核型属1A；②2n=3x=33,KF=33m, CRL=3L+12M_2+18M_1,As. K％=52.11％，核型属1A。点地梅属的染色体原始基数可能是x=10，在种间或种内观察到有3种核型变化：染色体非整倍性变化、多倍化和核型不对称性变化。将2倍体居群的核型和不对称性进行比较，可以看出点地梅是较对称的核型。因此，在研究的种中应是比较原始的类群。北点地梅的核型不对称性和进化程度高于点地梅而低于高原点地梅和西藏点地梅。染色体多倍化的雅江点地梅、鳞叶点地梅和西藏点地梅等在核型上也许是最进化的类群。