检索结果-南通市图书馆

Triterpenes from Cabralea canjerana as in Vitro Inhibitors to Light Reactions of Photosynthesis

American Journal of Plant Sciences 2014年第16期5卷 2528-2540页

作者： Beatriz King-Diaz Marcio S.Soares Maria Fatima das G.F.da Silva blas lotina-hennsen Thiago A.M.Veiga Departamento de Bioquimica Facultad de QuimicaUniversidad Nacional Autonoma de Mexico(UNAM)Ciudad UniversitariaMexico D.F.México Universidade Federal de Vicosa(UFV) Rio ParanaibaBrasil Departamento de Química Universidade Federal de Sao Carlos(UFSCar)Sao CarlosBrasil Instituto de Ciencias Ambientais Químicas e FarmaceuticasDepartamento de Ciencias Exatas e da TerraUniversidade Federal de Sao Paulo(UNIFESP)DiademaBrasil

Aims: Cabraleadiol (1), Ocotilone (2) and Odoratone (3) are three triterpenes isolated from Cabralea canjerana (Vell.) Mart. (Meliaceae). They were chemically characterized, and their effect was tested on the light reaction of photosynthesis. Study Design: Natural products were used as models to find new models for inhibitors of photosynthesis. Place and Duration of Study: Departmento de Química, Universidade Federal de São Carlos and Departmento de Bioquímica, Facultad de Química, Universidad Nacional Autonoma de México, between May 2013 and January 2014. Methodology: The natural products had their effect on the light reaction of photosynthesis studied by pollarography and Chlorophyll a (Chl a) fluorescence transients. Results: The compounds inhibited ATP synthesis and electron transport rate (basal, phosphorylating and uncoupled). Therefore, they act as Hill reactions inhibitors. Their inhibition site were located in the range of electron flow from OEC complex and between P680 to QA of PS II, and inhibited the photosystem II (PS II) by inducing the appearance of a K-band which is an indicative that the photochemical apparatus is failing at the donor side of PS II interacting at the OEC complex and by transforming active reaction centers to “heat sinks” or the formation of silent reaction centers unable to reduce QA. Conclusion: Furthermore, these triterpenes inhibit PS II and induce the appearance of small G band which is related with the decreased plastoquinone (PQ) pool reduction.

关键词： Cabralea canjerana Cabraleadiol Ocotilone Odoratone Photosynthesis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

为维持高油价 OPEC+推迟增产

引用

商业周刊（中文版） 2024年第15期 32-33页

作者： Javier blas 程玺(译) 不详

欧佩克+(OPEC+)就像茶包,用热水才能冲开。已故的罗伯特·马布罗(Robert Mabro)作为石油市场的敏锐观察家,总是说这个组织只有面临长期的财务压力时才会采取真正的行动。从最近的举措看,OPEC+似乎仍未察觉到自己已身处加热的水壶之中。

关键词：石油市场财务压力 OPEC 欧佩克高油价

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Comment on "Vortex of Fluid Field as Viewed from Curvature" [Commun. Theor. Phys. 43 (2005) 604]

引用

Communications in Theoretical Physics 2010年第1期53卷 43-44页

作者： blas Herrera Gerard Fortuny Departament d'Enginyeria Informàtica i Matemàtiques Universitat Rovira i Virgili

Here, we make comments to the conclusions of the paper： LIU Shi-Da, Sill Shao-Ying, LIU Shi-Kuo, et al., ＂Vortex of Fluid Field as Viewed from Curvature＂ [Commun. Theor. Phys. 43 （2005） 604].

关键词： curvature vortex

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Invasive strategy in elderly patients with acute coronary syndrome in 2018: close to the truth?

引用

Journal of Geriatric Cardiology 2019年第2期16卷 114-120页

作者： Sergio García-blas Clara Bonanad Juan Sanchis Servei de Cardiologia Hospital Clínic Universitari de València INCLIVA Universitat de ValènciaCIBERCV

Elderly population constitutes an increasingly larger proportion of patients admitted for acute coronary syndromes(ACS).The optimal management of ACS in these patients is still a challenge due to their clinical peculiarities and the paucity of specific data,and they have been traditionally managed more conservatively mainly based on subjective *** ST^segment elevation acute myocardial infarction urgent reperfusion is the standard of care and there is no upper age *** non-ST segment elevation acute myocardial infarction evidence is controversial,incomplete and mainly focused on chronological *** a strict conservative strategy should be avoided,routine invasive strategy may reduce the occurrence of myocardial infarction and need for revascularization at follow-up with no established benefit in terms of *** characteristics associated with aging,such as comorbidities and frailty,further discriminate patient's risk beyond *** is scarce,but it suggests that these features may modulate the benefit of invasive strategy in this *** trials should clarify the optimal management of ACS based on these parameters.

关键词： Acute coronary syndromes Comorbidity Frailty Percutaneous coronary intervention The elderly

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Distortion-stabilized ordered structures in A_(2)BB’O_(7) mixed pyrochlores

引用

npj Computational Materials 2019年第1期5卷 1076-1084页

作者： Ghanshyam Pilania Brian Puchala blas P.Uberuaga Materials Science and Technology Division Los Alamos National LaboratoryLos AlamosNM 87545USA Materials Science and Engineering Department University of MichiganAnn ArborMI 48109USA

Pyrochlore oxides(A2B2O7)are interesting for a number of technological applications,including radiation damage tolerance and as ionic *** pyrochlores—containing two A and/or two B site cations—provide even more flexibility for tailoring properties owing to the diverse chemical and configurational degrees of freedom accessible within this chemical ***,we examine relative stability of different cation orderings in one model double pyrochlore Gd2(Zr_(x)Ti_(1−x))_(2)O_(7),as a function of Zr content *** results show that,in the presence of some very specific local cation arrangements,certain cation-ordered compositions in this system are highly stabilized as a result of large oxygen relaxation displacements,leading to the formation of an ordered‘double’pyrochlore *** origins of these anomalous oxygen relaxations are traced back to both the local cation symmetry and a strong chemical preference of Zr atoms towards adopting a 7-fold coordination environment,as opposed to a 6-fold coordination available in a regular pyrochlore ***,we examine the stability of this type of ordering in 131 other pyrochlore *** of our findings are discussed in relation to the observed composition-dependent ionic conductivity in these systems and connections with previously reported experimental findings are made.

关键词： structure ordered stabilized

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Architecture as device:Estrangement theory from literature to architecture

引用

Frontiers of Architectural Research 2022年第1期11卷 1-12页

作者： Qirui Wan Sergio Martín blas Department of Architectural Design ETSAMUniversidad Politécnica de MadridMadrid28040Spain

What is the estrangement of architecture?The concept has been incessantly mentioned by academics while there seems to be a lack of discussion systematically sorting out the significance,influence,and origins of estrangement asanarchitectural *** aims to discern the meaning of estrangement from the beginning and its process of entering the field of *** first part is expected to answer the following questions:what is estrangement’s original meaning in the field of literature and its variantions?The second part determines what estrangement is in architecture and in what form estrangement is represented according to these *** third part points out the difference during this translation fromliterature to architecture and demonstrates the reasonable inference thatmay actually compose the possibleway of applying the estranging technique in architecture.

关键词： Estrangement Architectural strategy Literature concept Decontextualization Anthropopathic architecture

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The coppice-with-standards silvicultural system as applied to Eucalyptus plantations-a review

引用

Journal of Forestry Research 2014年第2期25卷 237-248页

作者： Antonio Carlos FERRAZ FILHO José Roberto Soares SCOLFORO blas MOLA-YUDEGO Departamento de Ciências Florestais Universidade Federal de Lavras (UFLA) School of Forest Sciences University of Eastern Finland (UEF)

We review the management of Eucalyptus species under a coppice-with-standards （CWS） silvicultural system. CWS management results in product diversification, permitting production of small and large scale timber from the same stand. Eucalyptus species are suitable candidates for CWS management because： there are large worldwide plantation areas, sprouting capacity is high, and eucalypts are multipur- pose species. We discuss （1） short rotation Eucalyptus coppice manage- ment for energy and pulping and （2） Eucalyptus seedling management for solid wood products. We review the literature and discuss experi- ences with Eucalyptus managed under the CWS system. We also assess projects dealing with Eucalyptus coppice management, stand density regulation, pruning, and stand and wood quality. The growth environ- ment of the standard trees （heavy competition up to the first harvest, free growth afterwards） coupled with long rotations （〉20 years） results in high quality logs for solid wood products. Early pruning should be ap- plied to enhance wood quality. We propose a system for the silvicultural management of Eucalyptus under the CWS system, elaborating on the consequences of initial planting density, site productivity, and standard tree densities as well as timing of basic silvicultural applications.

关键词： stand density regulation coppice management pruning silvicultural system stand production diversification CWS

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ischemic stroke:complication of hypertension in hospital west of Almeria in Spain

引用

Family Medicine and Community Health 2013年第1期1卷 8-13页

作者： JV GOMEZ-GONZALEZ blas GIL-EXTREMERA Critical Care Unit and Emergency Department Poniente HospitalAlmeriaSpain Hypertension and Lipid Unit Service of Internal MedicineSan Cecilio University HospitalGranadaSpain

Objective:The aim of this paper was to analyse the etiologic,clinical,and therapeutic characteristics of the ischemic stroke in the comarca of Poniente,Almeria,***:An observational descriptive study was carried out from June 2005 to June 2006 in the Hospital of *** studied 243 patients admitted to Internal Medicine Department diag-nosed with ischemic *** revised the clinical histories of patients using social,demographic,clinical,diagnostic,and therapeutic variables.A descriptive analysis of the variables was performed using SPSS V10.1 ***:A total of 172 patients(70.7%)were admitted to *** time course of the stroke episode was less than 6 hours(40.6%);mean age of patients 73 years(50% males);94% were autochthonous workers,6% immigrants,72% hypertensive,and 35% had a history of previous *** most common symptom was dysarthria(59%);brain CAT scan was performed in all of them within 6 hours after stroke onset,and antiplatelet drugs were given within 48 hours after stroke *** 30% of the patients received early rehabilitation,12% died within the first ***:We found clinical and epidemiologic characteristics similar to those reported in the literature;we found a lower incidence of CVD and a higher time course than the national average.

关键词： Hypertension Stroke Symptoms Risk factors

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Dynamic assessment of variations in pupil diameter using swept‑source anterior segment optical coherence tomography after phakic collamer lens implantation

引用

Eye and Vision 2021年第6期8卷 396-403页

作者： Felix Gonzalez‑Lopez Carmen Bouza‑Miguens Victor Tejerina Vasyl Druchkiv blas Mompean Julio Ortega‑Usobiaga Rafael Bilbao‑Calabuig Department of Refractive Surgery Clinica BavieraMelchor Fernández Almagro928029 MadridSpain Department of Research and Development Clinica BavieraValenciaSpain

Purpose:To dynamically assess variations in pupil diameter induced by changes in brightness in myopic eyes implanted with an implantable collamer lens(ICL,STAAR Surgical)with a central ***:This prospective,observational single-center case series study comprised 65 eyes from 65 consecutive patients undergoing ICL implant.A modified commercially available swept-source Fourier-domain anterior segment optical coherence tomography(AS-OCT)device was used for imaging and performing dynamic pupillometry under changing light conditions before and after a mean follow-up interval of four months after ***:Preoperative mean pupil size under photopic conditions was 3.38±0.64 mm;after surgery,this increased to 3.48±0.61 *** pupil size under scotopic light conditions was 5.72±0.79 mm before surgery and 5.84±0.77 mm *** differences between preoperative and postoperative pupil diameter in miosis and mydriasis were 0.10±0.44 mm(P=0.078)and 0.12±0.58 mm(P=0.098),*** scotopic pupil exceeded the optic zone of the implanted lens in 39 eyes(60%).The mean central vault value was 412±177μm under maximum miosis and 506±190μm under maximum *** found a positive correlation between vault and differences in pupil diameter under all light conditions(P<0.05).Conclusion:Dynamic AS-OCT enables a very precise determination of the pupillary diameter in the iris *** changes in the pupil diameter under different light conditions after the implantation of an ICL are related to the postoperative vault.

关键词： Phakic collamer lens ICL Pupil OCT Central hole Central port Posterior chamber phakic lens

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

引用

International Journal of Digital Earth 2018年第12期11卷 1205-1218页

作者： Ruben Valbuena Ana Hernando Jose Antonio Manzanera Eugenio Martínez-Falero Antonio García-Abril blas Mola-Yudego Department of Plant Sciences Forest Ecology and ConservationUniversity of CambridgeCambridgeUK School of Forest Sciences University of Eastern FinlandJoensuuFinland College of Forestry and Natural Environment Research Group SILVANETUniversidad Politécnica de MadridCiudad UniversitariaMadridSpain

In the context of predicting forest attributes using a combination of airborne LIDAR and multispectral(MS)sensors,we suggest the inclusion of normalized difference vegetation index(NDVI)metrics along with the more traditional LIDAR height *** the data fusion method consists of back-projecting LIDAR returns onto original MS images,avoiding co-registration *** prediction method is based on nonparametric imputation(the most similar neighbor).Predictor selection and accuracy assessment include hypothesis tests and over-fitting prevention *** show improvements when using combinations of LIDAR and MS compared to using either of them *** MS sensor has little explanatory capacity for forest variables dependent on tree height,already well determined from LIDAR ***,there is potential for variables dependent on tree diameters and their *** combination of LIDAR and MS sensors can be very beneficial for predicting variables describing forests structural heterogeneity,which are best described from synergies between LIDAR heights and NDVI *** demonstrate the potential of NDVI metrics to increase prediction accuracy of forest *** inclusion in the predictor dataset may,however,in a few cases be detrimental to accuracy,and therefore we recommend to carefully assess the possible advantages of data fusion on a case-by-case basis.

关键词： Airborne laser scanning forest attribute prediction multispectral imagery data fusion nearest neighbor

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：