Ce_(0.95)Ca_(0.05)F_(3-x)固体电解质氧传感器的研究

本文研究了Ce_(0.95)Ca_(0.05)F_(3-x)固体电解质及其氧传感器的制备和性质。在150℃时,Po_2在10~(-2)～10~(-1)MPa范围内传感器件的电位变化正比于Po_2的对数值。同时研究了不同参比电极和敏感电极对传感性能的影响。以Bi+BiF_3为参比电极时,EMF值稳定较快;当Pd作为敏感电极时,传感元件的响应较快;以RuO_2作敏感电极时,传感器件较灵敏。文章还讨论了敏感机理。

Cys-92, Cys-95, and the C-terminal 12 residues of the Vibrio harveyi ferric uptake regulator (Fur) are functionally inessential

Ferric uptake regulator (Fur) is a global regulator involved in multiple aspects of bacterial life. The gene encoding the Vibrio harveyi Fur (Fur(vh)) was cloned from a pathogenic V. harveyi strain isolated from diseased fish. Furvh shares 77% overall sequence identity with the Escherichia coli Fur (Fur(Ec)) and could complement a mutant of Fur(Ec). Like Fur(Ec), Fur(Vh), possesses two cysteine residues at positions 92 and 95, yet unlike Fur(Ec), in which these cysteine residues constitute part of the metal ion coordination site and hence are vital to the repressor activity, C92 and C95 of Fur(Vh) proved to be functionally inessential. Further study identified a Vibrio Fur signature sequence, which is preserved in all the ten Vibrio Fur proteins that have been discovered to date but in none of the non-vibrio Fur proteins. Site-directed and random mutation analyses of the signature residues, the cysteine residues, and seven highly charged amino acid residues indicated that D9, H32, C137, and K138 of Fur(vh) are functionally important but D9, C137, and K138 can be replaced by more than one functional substitutes. Systematic deletion analysis demonstrated that the C-terminal 12 residues of Fur(Vh) are functionally inessential. These results (i) indicated that the activation mechanism, or certain aspects of which, of Fur(Vh) is possibly different from that of Fur(Ec); and (ii) suggested that it is not very likely that the C-terminal 12 residues play any significant role in the activation or stability of Fur(Vh); and (iii) provided insights into the potential function of the local structure involving C137 and K138.

春小麦新品种高原314及其栽培技术

高原314是中国科学院西北高原生物研究所农业中心通过有性杂交培育的春小麦新品种，2001年12月通过青海省农作物品种审定委员会审定，品种原代号为95-314，现定名为高原314，属小麦Var. graecum Korn的变种。品种组合为：高原602 * {[ST142 * [(82宁182 * 82原11) * 47-2]] * [(78-17-3 * 83-228-3) * (Chanal * 338)]}F_3。

95-2重穗型小麦品系生长动态分析

对重穗型小麦品系95－2生长动态分析结果表明，95－2较一般概念上的栽培品系株型粗壮、高大．在整个生育期保持较高的有效光合面积，形成较高的生物学产量，根系发达，形成大穗大粒，体现了源大、库大的特点，茎拜系统也具良好的输导性能。在下一步超高产、稳产品种培育中，植株叶型及其合理配置是一个着重要考虑和解决的问题。

岩石圈伸展对粤北下庄矿田铀成矿的制约机制研究

地球动力学与成矿关系的研究是地球科学研究的前沿领域，而陆内岩石圈伸展与成矿的关系的研究则是该领域相对比较薄弱的环节。 华南地区于白垩—古近纪发生了岩石圈强烈的伸展减薄事件，且岩石圈伸展减薄与该区同时期形成的众多金属和非金属矿床有密切的成因联系，尤其是华南地区的花岗岩型热液铀矿床，显示了与该区岩石圈伸展作用可能有多方面的成因联系。粤北下庄铀矿田位于位于南岭铀-多金属成矿带的南部，是华南地区典型的花岗岩型热液铀矿区，本次研究在深入细致的野外地质工作的基础上，运用流体包裹体地球化学、元素地球化学、同位素地球化学等方法手段，开展了对下庄铀矿田成矿流体性质、成矿过程中元素的活动规律、成矿流体来源及演化等方面的系统研究，初步探讨了岩石圈伸展对该区铀成矿的制约机制，并建立了可能的矿床成因模式。通过研究，本次工作获得了以下几点主要认识： （1）通过对下庄铀矿田部分铀矿床流体包裹体显微测温、激光拉曼光谱及液相成分分析研究，查明了下庄矿田铀矿床矿前期热液属中高温（200℃~350℃）、低盐度（0.72%~5.95%NaCl）、密度中等（0.703~0.830g/cm3）、活动深度较深（2.29km~5.74km）、富∑CO2、相对还原性质的流体；成矿期热液属中低温（主要为154℃ ~250℃）、低盐度（0~1.83%NaCl）、密度中等（0.628~0.867g/cm3）、活动深度较浅（0.19km~1.62km）、富F-、相对氧化性质的流体。 （2）矿石矿矿物电子探针测试分析及岩、矿石的微量元素地球化学分析研研究表明，本区铀矿床主要的原生铀矿物为沥青铀矿、铀石、钛铀矿，铀矿物的形成与Si、Ca、W等元素有密切的关系，而其它金属元素未显示明显地富集。矿石、脉石矿物部分继承了原岩的稀土元素组成，且在原岩基础上又有高度的演化。 （3）进行了矿区内碳酸盐的C、O同位素和黄铁矿的He、Ar稀有气体同位素的分析研究。研究表明，矿化剂∑CO2主要为幔源，大量的He、Ar等稀有气体也来自于地幔。矿区发育的深大断裂构造可能控制了幔源挥发份的加入。 （4）脉石矿物碳酸盐和萤石的Sr、Nd同位素地球化学研究显示，成矿流体中的这些元素主要源于地壳，南区矿床（338、339）的Sr、Nd组成则为富含壳源Sr、Nd的流体与幔源基性脉岩不同程度的水—岩反应所致。另外，碳酸盐铅同位素研究显示，下庄矿区成矿物质铀可能来自帽峰式后期流体交代的花岗岩体。 （5）岩石圈伸展与下庄矿田铀成矿有关系密切：下庄矿田铀矿床明显受伸展构造控制，伸展构造既为导矿构造，又为储矿构造；岩石圈伸展导致的地温梯度升高，大地热流平均值加大，驱动热液流体的流动，为铀成矿提供了主要的热驱动力；岩石圈伸展产生的深大断裂导通了壳幔间的联系，使幔源脱气成因挥发份（主要为∑CO2）沿断裂上升，加入壳源热水循环系统，从而参与了铀成矿。 （6）初步建立了下庄矿田“岩石圈伸展体系下大陆热水系统铀矿床成因模式”。模式认为，华南地区白垩—古近纪岩石圈伸展作用引发区内热水流体的大规模循环，且伸展引起的幔源脱气作用产生的挥发份（主要为ΣCO2）加入了贫铀、贫矿化剂的循环的地下热水中，形成了富矿化剂热水。富矿化剂热水从富铀花岗岩中浸出铀（氧化作用），变为富矿化剂、富铀热液流体，这种热液流体在伸展引起的热驱动下沿构造上升，热液流体上升到浅部时，由于地球化学障、流体压力释放等因素的影响，U被还原沉淀，并在有利部位富集成矿。

Levantamento de banco de sementes e de flora daninha emergente no manejo integrado de plantas daninhas, em lavouras de soja no Parana - 95/96.

1997

Contribution to the knowledge of the genus "Cladonia" in Macaronesia

Sixteen species of the genus Cladonia are reported from Macaronesia from the Canary Islands. Three species are new to canarian flora and, two of them new to Macaronesia. The chemical variation of the taxa is reported. A phytogeographic distribution of the taxa with data on their habitat and ecology are presented.

Otras vías de aprendizaje: el reconocimiento de la experiencia profesional en la universidad. El caso de la UNED

Nadie cuestiona que una fuente de aprendizaje es el propio ámbito de trabajo, en el que todo profesional resuelve las funciones y tareas a las que se enfrenta diariamente a partir de su formación y de su experiencia. Reconocer esta experiencia en las titulaciones de Grado es un tema aún no resuelto. Pero este reconocimiento exige un proceso de evaluación, apoyado en metodologías y herramientas fiables y válidas, a partir del cual se valide que una persona ha adquirido un determinado nivel de logro en unas competencias en el marco de una cualificación profesional determinada. A raíz de los resultados obtenidos en 2 convocatorias dirigidas al reconocimiento de la experiencia profesional en el Grado en Educación Social impartido por la UNED, este articulo lleva a cabo un análisis de carácter descriptivo y en perspectiva comparada, entre ambas ediciones (2011-12 y 2012-13), con el fin de valorar la pertinencia de este proceso y la calidad de los resultados obtenidos. Con una muestra de 421 estudiantes hemos inferido la validez del procedimiento propuesto. Además, esta realidad nos muestra cuáles son las áreas de intervención más demandadas, los puntos fuertes y débiles de estos profesionales, las competencias más y menos consolidadas de acuerdo a la titulación que se imparte, etc. Disponer de estos datos, además de favorecer el desarrollo profesional de nuestros estudiantes, aporta una información clave para perfilar mejor las competencias específicas del título, trabajar de forma coordinada y colaborativa entre el mundo académico y el profesional, a la vez que responder a un derecho de nuestros estudiantes. 

Effects of intrahippocampal NAC(61-95) injections on memory in the rat and attenuation with vitamin E

Parkinson's disease (PD)-related dementia affects approximately 40% of PD patients and the severity of this dementia correlates significantly with the density of Lewy body (LB) deposition in the PD brain. Aggregated alpha-synuclein protein is the major component of LB's and the non-amyloid component (NAC) region of alpha-synuclein, residues 61-95, is essential for the aggregation and toxicity of this protein. The current study evaluated the effect of pre-aggregated NAC(61-95) injected into the CA3 area of the dorsal hippocampus of the brain on memory in the rat. Previous research has suggested that oxidative stress processes may play a role in the neuropathology of PD, therefore the effect of treatment with vitamin E, an antioxidant, was also evaluated. Male Sprague-Dawley rats were trained in two-lever operant chambers under an alternating-lever cyclic-ratio (ALCR) schedule of food reinforcement. When responding showed no trends, subjects were divided into four groups. Two groups were injected bilaterally into the dorsal hippocampus with aggregated NAC(61-95) (5 mu l suspension), and two groups were injected bilaterally into the dorsal hippocampus with sterile water (5 mu l). Subgroups were treated with either vitamin E (150 mg/kg in Soya oil) or vehicle (Soya oil) daily. Injection of NAC(61-95) induced memory deficits and vitamin E treatment alleviated these. In addition, NAC(61-95) injections induced activated astrocytes and chronic treatment with vitamin E reduced the numbers of activated astrocytes. These results suggest that aggregated NAC(61-95) and associated oxidative stress, may play a role in the pathogenesis of cognitive deficits seen in PD-induced dementia. (C) 2009 Elsevier Inc. All rights reserved.