Direct deposition and characterization of Langmuir-Blodgett monolayers of soluble polyimides

Langmuir-Blodgett (LB) monolayers of three kinds of soluble polyimides were prepared with the direct deposition method, The monolayer structures were characterized with W-vis absorption spectroscopy, the wide angle X-ray scattering method and electrochemical techniques. The polyimide molecules in the LB monolayers lie orderly on the substrate surfaces with the orientation in which the dianhydride group is normal to the substrate surface and two carbonyl oxygen groups close to the surface. Therefore, the thickness of the three kinds of polyimide LB monolayers are the same because it depends on the distance between the two carbonyl oxygen groups in the same ring. The area of monomeric units are dependent on the length of the diamine group. The model of the molecular packing proposed from the quantomechanical calculation is in good agreement with the experimental results. (C) 1997 Elsevier Science S.A.

DETERMINATION OF AMINOPYRINE AND ITS METABOLITE IN BIOLOGICAL FLUID BY LIQUID-CHROMATOGRAPHY ELECTROCHEMISTRY WITH A GLASSY-CARBON ELECTRODE DISPERSED WITH ALPHA-ALUMINA PARTICLES

A sensitive high-performance liquid chromatographic method has been developed for the quantitative determination of aminopyrine (AM) and its metabolite 4-aminoantipyrine (AAN). The method utilizes reverse-phase chromatography/amperometric detection with a glassy carbon electrode dispersed with alpha-arumina particles as the working electrode, on which the oxidation of AM and AAN was greatly improved compared with that on a bare glassy carbon electrode. As a result, the detection limit was as low as 1.4 ng for AM and 0.8 ng for AAN, and the calibration plots for the above compounds have wide linear ranges from 100 ng/mL to 100 mu g/mL and 60 ng/mL to 80 mu g/mL (for AM and AAN, respectively). The above method was applied for the detection of these materials in human urine with satisfactory results.

OPTICAL AND STRUCTURAL INVESTIGATION OF KMGLA(PO4)(2) PHOSPHATE DOPED WITH EUROPIUM

A new compound KMgLa(PO4)(2), isotypic with monoclinic LaPO4, is reported. Its cell parameters have been determined from X-ray powder diffraction data. Crystallization occurs in the monoclinic space group P2(1)/n (No. 14) with a = 6.839(3) Angstrom, b = 7.066(1) Angstrom, c = 6.523(3) Angstrom, beta = 103.42(4)degrees, and Z = 2. It was found that the KMgLa(PO4)(2) phase was isostructural with monoclinic LaPO4. The difference between them was that half of the La atoms in LaPO4 were couplingly substituted with the same amount of Mg and K atoms. This isomorphous substitution was confirmed by IR and Eu3+-doped excitation and emission spectra and by elemental analysis of single crystals. The spectroscopic data were compared with those of LaPO4:Eu3+. (C) 1995 Academic Press, Inc.

促进剂分子中共轭π键对细胞色素c电化学的影响

比较了具有单功能基团的共轭有机小分子噻吩和四氢噻吩对细胞色素ｃ直接电化学反应的促进作用。发现四氢噻吩不能加速细胞色素ｃ的直接电化学反应。而噻吩是一种很好的促进剂。表明噻吩分子中的共轭π键在加速细胞色素ｃ的电子传递过程中起着重要作用。

ISOPRENE POLYMERIZATION WITH (ETA(3)-C3H5)(2)CECL5MG2(TMED)(2)/ALKYLALUMINUM

(eta(3)-C3H5)(2)CeCl5Mg2(tmed)(2) combined with HAl(i-Bu)(2) or Al(i-Bu)(3) can initiate the polymerization of isoprene with about 50% of the cis-1, 4 microstructure contained in the polymer. The insertion reaction of isoprene occurring between Ce3+ and e

聚合物载体－稀土金属络合物的研究 Ⅻ．聚［苯乙烯－甲基丙烯酸β（甲基亚硫酰基）乙酯］载体－三氯化钕络合物－三异丁基铝体系催化丁二烯聚合的活性

研究了聚［苯乙烯－甲基丙烯酸β（甲基亚硫酰基）乙酯］（ＰＳＭ）载体－三氯化钕（ＮａＣ１３）络合物－Ａｌ（ｉ－Ｂｕ）３体系催化丁二烯聚合的活性与ＰＳＭ转化率和ＰＳＭ·ＮｄＣｌ３络合物组成的关系。实验结果表明，ＰＳＭ转化率为１８．１％～５３．４％，对ＰＳＭ·ＮｄＣｌ３－Ａｌ（ｉ－Ｂｕ）３体系的活性基本上无影响。低功能团含量的ＰＳＭ·ＮｄＣｌ３络合物的活性优于高功能团含量的ＰＳＭ·ＮｄＣｌ３。该络合物中Ｎｄ含量为４．５×１０（－４）ｍｏｌ／ｇ左右时，体系的催化活性最佳。体系的活性随引入的Ｌｅｗｉｓ酸的种类和用量的不同而改变。

POLYANILINE-DISPERSED MERCURY-ELECTRODE FOR THE DETECTION OF MONOCHLORAMINE AND DICHLORAMINE

A novel type of electrochemical detector based on a polyaniline-dispersed mercury-coated glassy carbon chemically modified electrode was investigated for the detection of monochloramine and dichloramine. A polyaniline dispersed-mercury modified electrode, which was prepared by coating polyaniline on a thin mercury film electrode using fast-sweep voltammetry, was developed. The selectivity could be altered using various counter ions incorporated into the polymer. The results indicated that the use of a conducting polymer-based electrochemical sensor for the selective determination of chloramine is a feasible approach.

RAMAN-SPECTROSCOPIC STUDY OF LAYER STRUCTURE COMPOUND [N-CNH2N+1NH3]2ZNCL4

The C-H stretching, C-H bending, C-C stretching and the low-frequency vibration regions have been investigated by Raman spectroscopy for [n-CnH2n+1NH3]2 ZnCl4 with n=7 approximately 12, 16. It is found that their frequency and relative intensities are related to the length of carbon chain in the molecules and present the odd-even effect to carbon atom numbers in chain. Some changes in spectra are interpreted in terms of the different molecular packing and interaction of chain.

钌-钛金属氧化物涂层电极的电子能谱分析

用X-光电子能谱分析了Ru-Ti金属氧化物电极的组成、结构和元素价态。结果表明,电极表面不同于体内,讨论了表面和体内Ti的价态区别对Ru-Ti阳极活性和寿命的影响,指出掺杂Ir和Pd后会提高电极活性。

四氯合锌酸烷基铵层形结构配合物的Raman光谱研究

测定了[n-C_nH_(2n+1)NH_3]ZnCl_4(n=7～12,16)配合物在碳氢伸缩、碳氢弯曲、碳碳伸缩和低频区的Raman光谱.发现它们的频率和相对强度与分子中烷基链的链长有关,并且表现出碳原子数的奇偶效应.从不同的分子堆积结构和分子间相互作用的角度讨论了光谱变化.

阳极氧化无机超滤膜

英国Alcan公司从1986年开发了阳极氧化无机超滤膜,并专门为此成立了名为

Induction and characterization of green pigmentation mutant in Porphyra yezoensis Ueda

The free living conchocelis of Porphyra yezoensis Ueda was treated with N-methyl-N-nitro-N-nitrosoguanidine to induce pigmentation mutants. The artificial green pigmentation mutant of P. yezoensis conchocelis, which was composed entirely of green cells, was isolated through visualization with the unaided eye. The acquired green conchocelis was further developed into a green gametophytic blade. This mutant was relatively stable in color in both gametophytic blade and conchocelis phases. The gametophytic blade mutant was successively cultivated for commerce at some Porphyra farms in Rudong, China, and few wild type or sectorially variegated gametophytic blade occurred, indicating that the green mutant has commercial value. The green mutant was characterized as having lower phycoerythrin and higher phycocyanin content, and SDS-PAGE suggested that phycoerythrin was missing the gamma-subunit in comparison to the wild type. The wild type and the green mutant showed a clear difference in 02 evolution rates in white, green, yellow, and red light, which might be due to the qualitative and quantitative changes of phycoerythrin, and the quantitative difference of phycocyanin. (C) 2008 Elsevier B.V. All rights reserved.

Molecular cloning and functional analysis of cathepsin B in nutrient metabolism during larval development in Meretrix meretrix

Seed rearing is an important part in large scale clam culture industry. Since the nutritional history affects early development in bivalve, the condition of larval nutrition plays a key role in successful seed rearing. So far, the molecular mechanism of nutrient uptake in bivalve larvae is unclear. As one of the important proteolytic enzymes, cathepsin B of several organisms has been reported to be involved in digestion. We intended to analyze whether cathepsin B is involved in larval nutrient metabolism in the economic bivalve, clam Meretrix meretrix. The full length of M. meretrix cathepsin B (MmeCB) cDNA was cloned, which is 1647 bp with an open reading frame of 1014 bp. The deduced amino acid sequence encoded a preproenzyme of 337 residues with Cys-114, His-282 and Asn-302 composing cathepsin B activity center. The temporal and spatial expressions of MmeCB mRNA were examined from trochophore to post larva stages by whole mount in situ hybridization. In trochophore stage, no detectable signal was found. In the later three stages, MmeCB mRNA was detected in the digestive gland, suggesting a possible role of MmeCB in digestion. Moreover, MmeCB mRNA was also observed in the epidermal cells in D-veligers. Cathepsin B specific inhibitor (CA074 methyl ester) was applied to block the activity of cathepsin B in unfed larvae. The average shell lengths of treated larvae were smaller than that in control groups. The results of mRNA epidermal distribution and inhibitor treatment in D-veligers indicated that MmeCB may be also associated with other pathway of nutrient metabolism in larval epidermis. The overall results in this paper revealed that MmeCB might play a role in larval nutrient metabolism. (C) 2008 Elsevier B.V. All rights reserved.