配位聚合物[Cd(S2CO-n-C4H9)2]n的合成和晶体结构

报道了正丁基黄原酸钠与硝酸镉形成的二维网状聚合物 [Cd(S2 CO -n -C4H9) 2 ]n 的合成与结构。该配合物属单斜晶系 ,空间群P2 (1) /c,晶胞参数 :a =2 .5 6 4 9(4)nm ,b=0 .5 810 (7)nm ,c=1.1348(41)nm ,β=10 1.70 1(2 ) 0 ,V =1.6 5 6 6 (4)nm3 ,Z =4 ,Dc =1.6 4 7mg/m3 ,F(0 0 0 ) =82 4 ,R1=0 .0 711,wR2 =0 .175 5。     

新型配合物（bpyH）2[Bi2I8（bpy）2]的合成与晶体结构

合成并测定了一种新的配合物--(bpyH)2 [Bi2I8(bpy)2]的晶体结构.该晶体属于正交晶系,Pccn空间群,a=15.991(3),b=17.007(3),c=19.443(4),α=β=γ=90o, V = 5287.4(18)3,μ=11.354mm-1,Z = 4,M = 2059.91,Dc = 2.588g/cm3,F(000)=3680,λ(MO Kα)=0.71073 ,最终偏离因子R1=0.0553,wR2=0.0695.该配合物的结构中,两个Bi原子处于八面体的中心,分别与三个端基碘,两个桥基碘,和一个端基联吡啶配体配位,形成[Bi I4(bpy)]22二聚体;另外两条联吡啶配体通过N…H氢键形成的超分子链贯穿于这些二聚体单元之间.     

Synthesis, structure, and reactivity of an iron(V) nitride

Despite being implicated as important intermediates, iron(V) compounds have proven very challenging to isolate and characterize. Here, we report the preparation of the iron(V) nitrido complex, [PhB((t)BuIm)(3)Fe(V)≡N]BAr(F24) (PhB((t)BuIm)(3)(-) = phenyltris(3-tert-butylimidazol-2-ylidene)borato, BAr(F24) = B(3,5-(CF(3))(2)C(6)H(3))(4)(-)), by one electron oxidation of the iron(IV) nitrido precursor. Single-crystal x-ray diffraction of the iron(V) complex reveals a four-coordinate metal ion with a terminal nitrido ligand. M??bauer and electron paramagnetic resonance spectroscopic characterization, supported by electronic structure calculations, provide evidence for a d(3) iron(V) metal center in a low spin (S = 1/2) electron configuration. Low-temperature reaction of the iron(V) nitrido complex with water under reducing conditions leads to high yields of ammonia with concomitant formation of an iron(II) species.     

量子点增强铁(III)催化鲁米诺-过氧化氢化学发光体系测定铁

[目的]建立利用量子点增强鲁米诺一过氧化氢一铁（Ⅲ）化学发光体系测定铁的新方法。[方法]利用CdTe量子点和鲁米诺一过氧化氢一铁（Ⅲ）化学发光体系对样品溶液中的铁含量进行了测定。[结果]单因素试验表明,量子点强烈地增强了化学发光信号,从而增加了反应体系的灵敏度;当鲁米诺浓度为1．0×10^-4mol／L,量子点浓度为7％,过氧化氢浓度为0．5％时,化学发光信号最强。在10～700ng／ml的浓度范围内,铁的浓度与化学发先强度呈良好的线性关系,其线性回归方程为△I=2．569C＋212．7．检出限为2．25ng／ml,RSD为2．6％。利用该法测得的血清1、2和水样1、2的铁含量分别为143．97、406．05、18．67、16．08ng／ml。[结论]该法可用于测定人血清和自来水中的铁含量。     

Soluble Mn(III) in suboxic zones

Soluble manganese(III) [Mn(III)] has been thought to disproportionate to soluble Mn(II) and particulate Mn(IV)O2 in natural waters, although it persists as complexes in laboratory solutions. We report that, in the Black Sea, soluble Mn(III) concentrations were as high as 5 micromolar and constituted up to 100% of the total dissolved Mn pool. Depth profiles indicated that soluble Mn(III) was produced at the top of the suboxic zone by Mn(II) oxidation and at the bottom of the suboxic zone by Mn(IV)O2 reduction, then stabilized in each case by unknown natural ligands. We also found micromolar concentrations of dissolved Mn(III) in the Chesapeake Bay. Dissolved Mn(III) can maintain the existence of suboxic zones because it can act as either an electron acceptor or donor. Our data indicate that Mn(III) should be ubiquitous at all water column and sediment oxic/anoxic interfaces in the environment.     

Breeding and Evaluation of New Iron Yam (Dioscorea opposita Thunb) Varieties

[Objective] This study was conducted to develop some new iron yam(Dioscorea opposita) varieties with excellent cooking, eating and nutritional qualities.[Method] The fresh weight per plant, drying rate, dry weight per plant, yield, allantoin content, water soluble extract content and disease resistance of seven new iron yam cultivars(No.1, No.2, No.4, No.6, No.8, No.9 and No.10) obtained through spaceflight mutation breeding were measured and compared with control(No.11).Then, the nutrition quality of two elite cultivars No. 6 and No.10 was determined by comparing with the control. [Result] The eight iron yam cultivars ranked in descending order of their fresh weight per plant as follows: No.6(0.255 kg)No.10(0.254 kg)No.4(0.242 kg)No.9(0.237 kg)No.1(0.233 kg)No.11(0.206 kg)No.2(0.191 kg)No.8(0.157 kg). There was no significant difference in fresh weight per plant between No.6 and No.10, but extremely significant difference between No.6 and the control,No.10 and the control. The eight iron yam cultivars ranked in descending order of their drying rate as follows: No.2(32.641%)No.10(32.230%)No.9(28.223%)No.6(25.174%)No.8(25.122%)No.11(25.043%)No.1(24.291%)No.4(20.234%). The drying rate of both No.6 and No.10 was higher than that of the control. The eight iron yam cultivars ranked in descending order of their dry weight per plant as follows:No.10(0.082 kg)No.9(0.067 kg)No.6(0.064 kg)No.2(0.062 kg)No.1(0.056 kg)No.11(0.052 kg)No.4(0.049 kg)No.8(0.039 kg). The dry weight per plant of both No.6and No.10 is higher than that of the control. The eight iron yam cultivars ranked in descending order of their allantoin content as follows No.6(0.484%)No.4(0.467%)No.10(0.399%) No.11(0.386%) No.9(0.378%) No.8(0.350%) No.2(0.342) No.1(0.325%). The allantoin content of No.6 was significantly higher than that of No.10 and the control. There was significant difference in allantoin content between No.6and No.10, but no significant difference between No 10 and the control. The eight iron yam cultivars ranked in descending order of their extract content as follows No.6(20.49%)No.2(16.01%)No.4(15.54%)No.10(15.35%)No.1(14.48%)No.11(14.10%)No.9(13.88%)No.8(11.87%). The extract content of No.6 exhibited extremely significant difference with that of No.10 and the control, and the extract content of No.10 was also significantly different from that of the control. The taste of No.10 was dry, soft, floury, sweet and fragrant, better than that of the other seven cultivars.No.6 had the strongest resistance to Gloeosporium pestis and Cylindrosporium dioscoreae. No.10 had a middle resistance to G. pestis and a strong resistance to C. dioscoreae. No.6 and No.10 had higher contents of starch, reducing sugar, protein and ash, lower water content and better nutrition quality than the control.[Conclusion] No.10 can be popularized as a new variety of edible iron yam, and No.6as a new variety of medicinal iron yam.     

磺胺类药物半抗原的合成及结构表征

本试验合成了4个模拟磺胺类药物母核结构的半抗原,使用1HNMR,FABMS和IR对半抗原结构进行了鉴定。产物结构中,4种间隔臂均位于对氨基本磺酞肤的N1端（-SO4NH-,突出了磺腔类药物的共同结构部分,为预期的半抗原。     

脲酶模型化合物的合成、表征及对尿素水解的影响

报道了对称六齿配体N,N,N',N'-四(2'-苯并咪唑甲基)乙二胺(EDTB)的一种含镍(Ⅱ)单核配合物[Ni(EDTB)CIO4][C6H4,(OH)COO]·CH3CH2OH·H2O(Ⅰ)的合成.时(Ⅰ)进行了元素分析、摩尔电导、紫外-可见光谱、红外光谱的研究,推测该配合物中每个镍(Ⅱ)离子为六配位的八面体结构.用气相色谱法观测该配合物对尿素水解反应的影响,结果表明几乎无催化尿素水解的活性.     

Structure of the hydrated alpha-Al(2)O(3) (0001) surface

The physical and chemical properties of the hydrated alpha-Al(2)O(3) (0001) surface are important for understanding the reactivity of natural and synthetic aluminum-containing oxides. The structure of this surface was determined in the presence of water vapor at 300 kelvin by crystal truncation rod diffraction at a third-generation synchrotron x-ray source. The fully hydrated surface is oxygen terminated, with a 53% contracted double Al layer directly below. The structure is an intermediate between alpha-Al(2)O(3) and gamma-Al(OH)(3), a fully hydroxylated form of alumina. A semiordered oxygen layer about 2.3 angstroms above the terminal oxygen layer is interpreted as adsorbed water. The clean alpha-Al(2)O(3) (0001) surface, in contrast, is Al terminated and significantly relaxed relative to the bulk structure. These differences explain the different reactivities of the clean and hydroxylated surfaces.     

R(-)-苄霜灵的合成研究

N (2 ,6二甲苯基 )丙氨酸甲酯经皂化反应后获得N (2 ,6二甲苯基 )丙氨酸。在甲苯和石油醚混合溶剂中 ,用R (+)或S (- )α甲基苄胺作为拆分剂与N (2 ,6二甲苯基 )丙氨酸反应 ,在不同的温度条件下 ,根据结晶速度不同 ,分别获得R (+)或S (- )N (2 ,6二甲苯基 )丙氨酸的非对映体盐。非对映体盐用 10 0g·L-1NaOH水解 ,10 0g·L-1HCl酸化 ,制得旋光性的N (2 ,6二甲苯基 )丙氨酸后用甲醇酯化 ,获得旋光性N (2 ,6二甲苯基 )丙氨酸甲酯。苯乙酰氯与旋光性N (2 ,6二甲苯基 )丙氨酸甲酯缩合 ,最终生成R (- )苄霜灵     

NDV HN蛋白的结构与功能

新城疫病毒 (ＮＤＶ)属副粘病毒科腮腺炎病毒属成员 ,为反义负链ＲＮＡ病毒。本病毒囊膜为双层类脂膜 ,膜表面的两个纤突糖蛋白负责介导病毒吸附侵入宿主细胞。病毒侵入宿主细胞需要经过两个步骤 :先由Ⅱ型糖蛋白粘附蛋白 (ＨＮ)特异识别细胞表面唾液酸受体、水解唾液酸。同时 ,激活Ⅰ型糖蛋白(Ｆ)促使细胞膜发生融合。ＨＮ蛋白在融合过程中起到促进Ｆ蛋白的融合作用。所有副粘病毒都具有Ⅱ型糖蛋白 ,具有血凝素和神经氨酸酶活性的称为ＨＮ ,在没有神经氨酸酶活性的病毒属中 ,如麻疹病毒属 ,则称为Ｈ。在肺病毒属中同源的附着蛋白无血凝素活…     

Temperature of an Iron Meteoroid in Space

The solar absorptance and hemispherical emittance of meteoritic iron has been measured from -100 degrees to 300 degrees C for a surface characterized by a 400-grit finish. If it is assumed that 10 percent of the surface is optically black because of holes and cracks, the temperature of an iron meteoroid at the earth's mean distance from the sun would be about 90 degrees C.     

High-Pressure Transitions in A(III)B(VI) Compounds: Indium Telluride

Metallic InTe(II) has a NaCl structure with ao = 6.154 A and becomes superconducting below 3.5 degrees K. These results are substantially different from those previously reported. The pressure-temperature diagram to 850 degrees C and 50 kb is presented.     

胭脂鱼精子结构研究

用光学显微镜和透射电子显微镜对胭脂鱼精子的结构进行研究,并在光学显微镜下对精子各部分的长度进行测定.结果表明,胭脂鱼的精子主要分为头部、中段和尾部(鞭毛);头部在光学显微镜下近圆形,透射电镜下头部纵切似马蹄形;头部无顶体,主要由细胞核组成,核内染色质致密,核内有核空泡;核外可见清晰的核膜,头部几乎无细胞质存在;头部后端中央处有一较深的植入窝,深度占细胞核总长约2/3,植入窝内有中心粒复合体.精子的中片紧连在核的后端,由中心粒复合体和袖套组成;袖套两边接近对称;中心粒复合体由近端中心粒和远端中心粒组成;近端中心粒与远端中心粒之间的角度近直角,呈"T"字形;精子尾部轴丝与细胞膜之间有较大的空间,轴丝与细胞膜之间还有囊泡等细胞器;精子尾部有侧鳍;尾部可分为主段和末段,尾部主段具有典型的"9+2"的轴丝结构.光学显微镜测定结果表明,精子头长约(2.56±0.14)μm,尾部约(52.69±5.59)μm,全长约(55.51±5.67)μm.     

四(4-三甲胺苯)卟啉抗原抗体的制备与抗体效价的测定

利用邻硝基苯甲醛和吡咯合成Ｈ２Ｔｎｏ２ＰＰ，再还原成Ｈ２ＴａｍＰＰ，最后合成四（α，α，α，α－Ｏ－三甲胺苯）卟啉。用它免疫ＢＡＬＢ／Ｃ小鼠，酶联免疫吸附法测定抗体效价达６４０。表明该半抗原加载体，可以诱导抗体产生。