Study on the difference of photochromic and thermochromic mechanism of ethylenediamine trimolybdate

Ethylenediamine trimolybdate ((C2H10N2)[Mo3O10], denoted as ENTMo) shows unusual photochromic and thermochromic properties. The color of the white ENTMo compounds becomes reddish brown gradually under UV irradiation, and changes gradually to blue-black upon annealing. XRD patterns and FT-IR spectra verify that the crystal structure of the colored samples is almost unchanged except distortion. UV-vis diffuse reflectance spectra (DRS) and ESR spectra of the photochromic and the thermochromic samples could confirm that there must exist difference between thermochromic and photochromic mechanism.

Formation of a metastable phase induced by a liquid crystalline phase in a novel chloropoly(aryl ether ketone)

The phase transition behavior of a thermotropic liquid crystalline poly(aryl ether ketone) synthesized by nucleophilic substitution reactions of 4,4'-biphenol (BP), and chlorohydroquinone (CH) with 1,4-bis(4-fluorobenzoyl)benzene (BF) has been investigated by differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). The copolymer exhibits multiple first order phase transitions, which are associated with crystal-to-smectic liquid crystal transition and smectic liquid crystal-to-isotropic transition. When the cooling rate is low (<10C/min), only stable crystal from I is formed. With the cooling rate being high (>20 degreesC/min), the metastable crystal form II is formed, which always coexists with form I. The liquid crystalline phase plays an important role in the formation of metastable phase form II.

MALDI-TOF-MS法用于谷脱甘肽S-转移酶分子量的测定

利用MALDI-TOF-MS法测定了谷胱甘肽S-转移酶的分子量,并讨论和对比了三种不同基质对其影响,认为用α-氰基-4-羟基肉桂酸(α-CHC)作基质是最佳适宜条件。实验结果表明本方法优于其它传统的测定生物大分子分子量方法。

Efficient cleavage of ribonucleoside 3',5'-cyclic phosphates and deoxyribonucleoside 3',5'-cyclic phosphate by lanthanides

The cleavage of 3',5'-cAMP, 3',5'-cGMP and 3',5'-dcAMP by lanthanides has been investigated by HPLC and H-1 NMR. Rapid cleavage of cAMP, cGMP and dcAMP by Ce(III) under air at pH 8 and 37 degrees C has been observed. Regioselective cleavage of P-O(5') bond in cAMP, cGMP and dc;aMP tu give the corresponding 3'-AMP, 3'-GMP and 3'-dAMP by lanthanide chlorides has been achieved, and 3'-AMP and 3'-GMP are cleaved to adenosine(A) and guanosine(CT) more slowly, respectively, The notable difference in reactivity between Ce(III) and the other lanthanide ions under air has also been studied. The cleavage is enhanced with the increase in the molar fraction of Ce(IV). The fast cleavage of cAMP by Ce(III) under air at pH 8 is ascribed to the resultant Ce(IV) in the reaction mixture.

Truly chlorine-resistant polyamide reverse osmosis composite membrane

Truly chlorine-resistant polyamide reverse osmosis composite membranes were prepared by cross-linking the interface of the composite membrane. Such membranes possessed chlorine resistance one order of magnitude more than those of the commercially used polyamide composite membranes. The effect of the degree of cross-linking on chlorine resistance was also described. (C) 1996 John Wiley & Sons, Inc.

Influence of the earth rotation on the interfacial wave solutions and wave-induced tangential stress in a two-layer fluid system

Interfacial waves and wave-induced tangential stress are studied for geostrophic small amplitude waves of two-layer fluid with a top free surface and a flat bottom. The solutions were deduced from the general form of linear fluid dynamic equations of two-layer fluid under the f-plane approximation, and wave-induced tangential stress were estimated based on the solutions obtained. As expected; the solutions derived from the present work include as special cases those obtained by Sun et al. (2004. Science in China, Set. D, 47(12): 1147-1154) for geostrophic small amplitude surface wave solutions and wave-induced tangential stress if tire density of the upper layer is much smaller than that of the lower layer. The results show that the interface and the surface will oscillate synchronously, and the influence of the earth's rotation both on the surface wave solutions and the interfacial wave solutions should be considered.

矮嵩草光合作用与环境因素关系的比较研究

以青海高原不同海拔地区生长的矮肖草为材料, 研究高山植物光合作用随海拔梯度的变化特征及对生长环境和低温胁迫的反应随海拨升高矮篙草叶绿素含量有降低的趋势, 而叶绿素值和类胡萝卜素含量则随海拔升高而增高。生长地区海拔越高矮篙草光合速率、光补偿点、光饱和点越高而光合表观量子产额则随海拨升高而降低光呼吸强度有随海拨升高而降低的趋甄矮篙草光合作用特性受生长环境因素的影响。低温胁迫导致矮篙草光合速率、表观量子产额降低, 低温下的光照加剧了光合作用抑制的程度。

面向供应链管理的企业集成

本文指出面向供应链管理的企业集成是人们对制造业实践和先进制造理论和技术的研究和开发的结果，实现供应链上的企业集成和优化，开发多企业集成控制管理系统是未来制造业追求的目标。本文介绍了企业管理的发展历程，提出了面向供应链的企业集成模式，指出其中信息技术所占的地位。简单介绍了多企业集成的开发方法和我们的方案。 　

卟啉作为人体早期砷暴露生物标志的研究

采用氢化物发生原子吸收分析了贵州省燃煤污染型砷中毒区和非砷中毒区(对照)居民尿样中砷浓度,采用高效液相色谱法分析了卟啉浓度,考察了燃煤污染造成的人体砷暴露与尿液中卟啉排泄改变的关系,寻求慢性砷中毒早期健康效应的生物标志物.结果显示,与对照组相比,砷暴露组尿卟啉Ⅲ(uroporphyrin-Ⅲ)和粪卟啉Ⅲ(coproporphyrin-Ⅲ)显著增高(p<0.01,p<0.01),粪卟啉Ⅰ(coproporphyrin-Ⅰ)比对照组增高,但不显著;不同性别组间比较,对照组和暴露组的中龄(20-40岁)群体尿液中,尿卟啉Ⅲ的浓度在男性和女性群体之间呈显著性的差异(p<0.01),其它年龄组中,这一指标在不同性别群体之间未见显著性差异;不同年龄分层比较,低龄组(<20岁)尿卟啉Ⅲ和粪卟啉Ⅲ比对照显著增高(p<0.01,p<0.01),中龄组(20-40岁)和高龄组

Recomendações técnicas para o cultivo de soja em regiões de baixas latitudes (< 12oS).

Calagem e adubacao; Cultivares recomendadas; Populacao densidade e epocas de semeadura; Instalacao da lavoura; Tecnologia de sementes; Doencas; Plantas daninhas; Manejo de pragas; Colheita; Fatores que afetam a eficiencia; Preparo do solo; Epoca de semeadura, espacamento e densidade; Cultivares; Plantas daninhas; Retardamento de colheita; Umidade de graos; Regulagem e conducao da maquina; Avaliacao de perdas; Retencao foliar ("haste verde").

Theatre/Archaeology: Disciplinary Dialogues

Pearson, Mike, Shanks, Michael, Theatre/Archaeology (London: Routledge, 2001), pp.xviii+215 RAE2008

Depolarization of sperm membrane potential is a common feature of men with subfertility and is associated with low fertilization rate at IVF

STUDY QUESTION. Are significant abnormalities in outward (K+) conductance and resting membrane potential (Vm) present in the spermatozoa of patients undertaking IVF and ICSI and if so, what is their functional effect on fertilization success? SUMMARY ANSWER. Negligible outward conductance (≈5% of patients) or an enhanced inward conductance (≈4% of patients), both of which caused depolarization of Vm, were associated with a low rate of fertilization following IVF. WHAT IS KNOWN ALREADY. Sperm-specific potassium channel knockout mice are infertile with defects in sperm function, suggesting that these channels are essential for fertility. These observations suggest that malfunction of K+ channels in human spermatozoa might contribute significantly to the occurrence of subfertility in men. However, remarkably little is known of the nature of K+ channels in human spermatozoa or the incidence and functional consequences of K+ channel defects. STUDY DESIGN, SIZE AND DURATION. Spermatozoa were obtained from healthy volunteer research donors and subfertile IVF and ICSI patients attending a hospital assisted reproductive techniques clinic between May 2013 and December 2015. In total, 40 IVF patients, 41 ICSI patients and 26 normozoospermic donors took part in the study. PARTICIPANTS/MATERIALS, SETTING, METHODS. Samples were examined using electrophysiology (whole-cell patch clamping). Where abnormal electrophysiological characteristics were identified, spermatozoa were further examined for Ca2+ influx induced by progesterone and penetration into viscous media if sufficient sample was available. Full exome sequencing was performed to specifically evaluate potassium calcium-activated channel subfamily M α 1 (KCNMA1), potassium calcium-activated channel subfamily U member 1 (KCNU1) and leucine-rich repeat containing 52 (LRRC52) genes and others associated with K+ signalling. In IVF patients, comparison with fertilization rates was done to assess the functional significance of the electrophysiological abnormalities. MAIN RESULTS AND THE ROLE OF CHANCE. Patch clamp electrophysiology was used to assess outward (K+) conductance and resting membrane potential (Vm) and signalling/motility assays were used to assess functional characteristics of sperm from IVF and ICSI patient samples. The mean Vm and outward membrane conductance in sperm from IVF and ICSI patients were not significantly different from those of control (donor) sperm prepared under the same conditions, but variation between individuals was significantly greater (P< 0.02) with a large number of outliers (>25%). In particular, in ≈10% of patients (7/81), we observed either a negligible outward conductance (4 patients) or an enhanced inward current (3 patients), both of which caused depolarization of Vm. Analysis of clinical data from the IVF patients showed significant association of depolarized Vm (≥0 mV) with low fertilization rate (P= 0.012). Spermatozoa with electrophysiological abnormities (conductance and Vm) responded normally to progesterone with elevation of [Ca2+]i and penetration of viscous medium, indicating retention of cation channel of sperm (CatSper) channel function. LIMITATIONS, REASONS FOR CAUTION. For practical, technical, ethical and logistical reasons, we could not obtain sufficient additional semen samples from men with conductance abnormalities to establish the cause of the conductance defects. Full exome sequencing was only available in two men with conductance defects. WIDER IMPLICATIONS OF THE FINDINGS. These data add significantly to the understanding of the role of ion channels in human sperm function and its impact on male fertility. Impaired potassium channel conductance (Gm) and/or Vm regulation is both common and complex in human spermatozoa and importantly is associated with impaired fertilization capacity when the Vm of cells is completely depolarized.

Atitudes dos médicos dentistas no tratamento médico-dentário de pacientes com deficiência mental

Monografia apresentada à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Licenciada em Medicina Dentária