检索结果-南通市图书馆

Confirming Stereochemical Structures of Strigolactones Produced by Rice and Tobacco

Molecular Plant 2013年第1期6卷 153-163页

作者： Xiaonan Xie Kaori Yoneyama Takaya Kisugi Kenichi Uchida Seisuke Ito Kohki Akiyama Hideo Hayashi takao yokota Takahito Nomura Koichi Yoneyama Weed Science Center Utsunomiya University 350 Mine-machi Utsunomiya 321-8505 Japan Department of Biosciences Faculty of Science and Technology Teikyo University 1-1 Toyosatodai Utsunomiya 320-8851 Japan Graduate School of Life and Environmental Sciences Osaka Prefecture University 1-1 Gakuen-cho Nakaku Sakai Osaka 599-8531 Japan

Major strigolactones （SLs） produced by rice （Oryza sativa L. cv. Nipponbare） and tobacco （Nicotiana tabacum L. cv. Michinoku No. 1） were purified and their stereochemical structures were determined by comparing with optically pure synthetic standards for their NMR and CD data and retention times and mass fragmentations in ESI-LC/MS and GC-MS. SLs purified from root exudates of rice plants were orobanchol, orobanchyl acetate, and ent-2＂-epi-5-deoxystr- igol. In addition to these SLs, 7-oxoorobanchyl acetate and the putative three methoxy-5~deoxystrigol isomers were detected by LC-MS/MS. The production of 7-oxoorobanchyl acetate seemed to occur in the early growth stage, as it was detected only in the root exudates collected during the first week of incubation. The root exudates of tobacco contained at least 11 SLs, including solanacol, solanacyl acetate, orobanchol, ent-2＂-epi-orobanchol, orobanchyl acetate, ent-2＇- epi-orobanchyl acetate, 5-deoxystrigol, ent-2＂-epi-5-deoxystrigol, and three isomers of putative didehydro-orobanchol whose structures remain to be clarified. Furthermore, two sorgolactone isomers but not sorgolactone were detected as minor SLs by LC-MS/MS analysis. It is intriguing to note that rice plants produced only orobanchol-type SLs, derived from ent-2＂-epi-5-deoxystrigol, but both orobanchol-type and strigol-type SLs, derived from 5-deoxystrigol were detected in tobacco plants.

关键词： germination stimulant Orobanche rice root parasitic plant Striga strigolactone tobacco.

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

Effect of Fluidic Diode on Performance of Unidirectional Impulse Turbine

引用

Journal of Thermal Science 2024年第3期33卷 807-814页

作者： DODDAMANI Hithaish ABDUS Samad MANABU takao SHINYA Okuhara M M ASHRAFUL Alam Department of Ocean Engineering Indian Institute of Technology MadrasChennai600036India Department of Mechanical Engineering National Institute of TechnologyMatsue CollegeShimane6908518Japan Center of Support Practical Education National Institute of TechnologyMatsue CollegeShimane6908518Japan Department of Transportation Engineering Osaka Sangyo UniversityDaito5748530Japan

A pair of unidirectional turbines(UT)can operate in oscillatory airflow without additional units.However,this arrangement suffers from poor flow rectification.A fluidic diode(FD)offers variable hydrodynamic resistance based on the flow direction,and this can be coupled with UT to improve flow rectification.In this work,a numerical investigation on the effect of FD with UT is presented using the commercial fluid dynamics software ANSYS Fluent 16.1 with k-ωSST turbulence closure model.Periodic domains of UT and FD are numerically validated individually with experimental results.Later,both are coupled to obtain the combined effect,and these results are compared with the analytical approach.It was observed that coupling FD with UT improved the unit's performance at the lower flow coefficient(<1),but its performance decreased as the flow coefficient increased.Due to the diode's presence,fluid leaving the turbine experiences higher resistance at a higher flow coefficient,which decreases the overall performance of the combined unit.

关键词： wave energy oscillating water column unidirectional impulse turbine fluidic diode flow rectification

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

Using orbital sensitivity analysis to pinpoint the role of orbital interactions in thermoelectric power factor

引用

npj Computational Materials 2023年第1期9卷 937-945页

作者： Wenhao Zhang Jean-François Halet takao Mori WPI Center for Materials Nanoarchitectonics(MANA) National Institute for Materials ScienceTsukubaJapan Graduate School of Pure and Applied Sciences University of TsukubaTsukubaJapan CNRS-Saint-Gobain-NIMS Laboratory for Innovative Key Materials and Structures(LINK)National Institute for Materials ScienceTsukubaJapan

The modification of the electronic band structure is of critical importance for thermoelectric materials whose heat to electricity power generation is related to carrier effective mass and alignment of semiconductor band edges.One approach to optimize the electronic band structure is by modification of orbital interactions through doping or alloying.While the current ab-initio quantum chemical calculations can help us to investigate orbital components of electronic bands,they reveal little information on the relative tunability of electronic states and transport properties with respect to orbital interactions.In this work,we present a method,based on a symmetry-adapted tight-binding model and sensitivity analysis,that can pinpoint the role of orbital interactions in determining electronic band structure and transport properties.As an application,a systematic theoretical analysis is used to show how the power factor of PbTe can/cannot be improved by playing with interatomic orbital interactions.The orbital interaction sensitivity analysis introduced in this work can easily be applied to other compounds or properties.

关键词： properties orbital symmetry

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

P-Frobenius问题与p-对称数值半群

引用

浙江理工大学学报（自然科学版） 2024年第2期51卷 265-270页

作者：应皓天小松尚夫浙江理工大学理学院杭州310018

针对p-Frobenius问题中出现的非对称性问题,利用数值半群理论以及Apery集等工具研究了p-Frobenius问题对应的p-对称数值半群。首先利用数值半群和Apery集等工具对p-Frobenius问题进行预处理,得到了对应数值半群和Apery集的各个变量;并... 详细信息

针对p-Frobenius问题中出现的非对称性问题,利用数值半群理论以及Apery集等工具研究了p-Frobenius问题对应的p-对称数值半群。首先利用数值半群和Apery集等工具对p-Frobenius问题进行预处理,得到了对应数值半群和Apery集的各个变量;并将这些变量与对称数值半群和Frobenius问题进行对比,由此定义了p-对称数值半群,并给出了p-对称性的刻画。在此基础上,首先给出了两大类p-对称数值半群,其次研究了对称数值半群与p-对称数值半群的p化关联性。这两类p-对称数值半群给出了大量具体实例,而p化关联性则可用于处理p-Frobenius问题中出现的非对称问题。

关键词：数值半群线性丢番图方程 Apery集对称性 Frobenius问题

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

Recent progress in solution-processed flexible organic photovoltaics

引用

npj Flexible Electronics 2022年第1期6卷 871-884页

作者： Lulu Sun Kenjiro Fukuda takao Someya Thin-Film Device Laboratory RIKEN2-1 HirosawaWakoSaitama 351-0198Japan Center for Emergent Matter Science(CEMS) RIKEN2-1 HirosawaWakoSaitama 351-0198Japan Department of Electrical Engineering and Information Systems School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan

The certified power conversion efficiency(PCE)of organic photovoltaics(OPV)fabricated in laboratories has improved dramatically to over 19%owing to the rapid development of narrow-bandgap small-molecule acceptors and wide bandgap polymer donor materials.The next pivotal question is how to translate small-area laboratory devices into large-scale commercial applications.This requires the OPV to be solution-processed and flexible to satisfy the requirements of high-throughput and large-scale production such as roll-to-roll printing.This review summarizes and analyzes recent progress in solution-processed flexible OPV.After a detailed discussion from the perspective of the behavior of the narrow bandgap small-molecule acceptor and wide bandgap polymer donor active layer in solution-processed flexible devices,the existing challenges and future directions are discussed.

关键词： donor narrow translate

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

Saccharomyces cerevisiae in neuroscience:how unicellular organism helps to better understand prion protein?

引用

Neural Regeneration Research 2021年第3期16卷 489-495页

作者： takao Ishikawa Department of Molecular Biology Institute of BiochemistryFaculty of BiologyUniversity of WarsawWarsawPoland

The baker's yeast Saccharomyces(S.)cerevisiae is a single-celled eukaryotic model organism widely used in research on life sciences.Being a unicellular organism,S.cerevisiae has some evident limitations in application to neuroscience.However,yeast prions are extensively studied and they are known to share some hallmarks with mammalian prion protein or other amyloidogenic proteins found in the pathogenesis of Alzheimer's,Parkinson's,or Huntington's diseases.Therefore,the yeast S.cerevisiae has been widely used for basic research on aggregation properties of proteins in cellulo and on their propagation.Recently,a yeast-based study revealed that some regions of mammalian prion protein and amyloidβ1–42 are capable of induction and propagation of yeast prions.It is one of the examples showing that evolutionarily distant organisms share common mechanisms underlying the structural conversion of prion proteins making yeast cells a useful system for studying mammalian prion protein.S.cerevisiae has also been used to design novel screening systems for anti-prion compounds from chemical libraries.Yeastbased assays are cheap in maintenance and safe for the researcher,making them a very good choice to perform preliminary screening before further characterization in systems engaging mammalian cells infected with prions.In this review,not only classical red/white colony assay but also yeast-based screening assays developed during last year are discussed.Computational analysis and research carried out using yeast prions force us to expect that prions are widely present in nature.Indeed,the last few years brought us several examples indicating that the mammalian prion protein is no more peculiar protein–it seems that a better understanding of prion proteins nature-wide may aid us with the treatment of prion diseases and other amyloid-related medical conditions.

关键词： amyloid artificial prion baker's yeast budding yeast drug screening fusion protein neurodegenerative diseases prion protein yeast-based assay

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

Association of antithrombotic therapy with postoperative rebleeding in patients with cerebral amyloid angiopathy

引用

Chinese Neurosurgical Journal 2023年第3期9卷 159-165页

作者： Taro Yanagawa Hiroki Sato Kaima Suzuki Hidetoshi Ooigawa Masaki takao Hiroki Kurita Department of Cerebrovascular Surgery International Medical CenterSaitama Medical University1397-1 YamaneHidaka CitySaitama 350-1298Japan Stroke Center Sagamihara Kyodo Hospital4-3-1 HashimotodaiMidori-KuSagamihara CityKanagawa-Pref 252-5188Japan Department of Clinical Laboratory National Center of Neurology and PsychiatryNational Center Hospital4-1-1Ogawa-HigashiKodairaTokyo 187-8502Japan

Background Cerebral amyloid angiopathy is a common cause of subcortical hemorrhage in older adults.Although open hematoma removal may be performed for severe subcortical hemorrhage,its safety in patients with cerebral amyloid angiopathy has not been established,and postoperative rebleeding may occur.Therefore,this study aimed to investigate factors associated with postoperative rebleeding.Methods Out of 145 consecutive patients who had undergone craniotomy for surgical removal of subcortical intracerebral hemorrhage between April 2010 and August 2019 at a single institution in Japan,we examined 109 patients with subcortical hemorrhage who met the inclusion criteria.After excluding 30 patients whose tissue samples were unsuitable for the study,the final study cohort comprised 79 patients.Results Of the 79 patients,50(63%)were diagnosed with cerebral amyloid angiopathy(cerebral amyloid angiopathy group)and 29(37%)were not diagnosed with noncerebral amyloid angiopathy(noncerebral amyloid angiopathy group).Postoperative rebleeding occurred in 12 patients(24%)in the cerebral amyloid angiopathy group and in 2 patients(7%)in the noncerebral amyloid angiopathy group.Preoperative prothrombin time-international normalized ratio and intraoperative bleeding volume were significantly associated with postoperative rebleeding in the cerebral amyloid angiopathy group(odds ratio=42.4,95%confidence interval=1.14-1578;p=0.042 and odds ratio=1.005,95%confidence interval=1.001-1.008;p=0.007,respectively).Conclusions Patients with cerebral amyloid angiopathy-related cerebral hemorrhage who are receiving antithrombotic therapy,particularly warfarin therapy,are at a high risk of postoperative rebleeding.Trial registration Registry and Registration Number of the study:19-220,2019/12/23,retrospectively registered.

关键词： Amyloid-β Antithrombotic therapy Cerebral amyloid angiopathy Postoperative rebleeding Subcortical hemorrhage

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

Brachiocephalic to left brachial vein thrombotic vasculitis accompanying mediastinal pancreatic fistula:A case report

引用

World Journal of Clinical Cases 2022年第32期10卷 11882-11888页

作者： Reiji Kokubo Daisuke Yunaiyama Yu Tajima Natsumi Kugai Mitsuru Okubo Kazuhiro Saito Takayoshi Tsuchiya takao Itoi Department of Radiology Tokyo Medical UniversityTokyo 160-0023Japan Department of Gastroenterology and Hepatology Tokyo Medical UniversityTokyo 160-0023Japan

BACKGROUND Pancreatitis is a severe inflammatory pancreatic disease commonly due to bile duct stones or excessive alcohol usage,with clinical manifestations of abdominal pain,nausea,fever,and fluid collections.Healthy persons with less symptomatic pancreatitis are quite rare.Herein,we report a case of a patient with an undetermined onset of pancreatitis mimicking left arm cellulitis due to thrombotic vasculitis of the brachiocephalic vein.CASE SUMMARY A 50-year-old woman visited our hospital for tenderness in the left arm over several recent days.She was diagnosed with cellulitis on the left arm due to left elbow tenderness.Intravenous antibiotics administration did not improve symptoms and laboratory data worsened;thus,chest and abdominal computed tomography(CT)was performed.CT demonstrated pancreatitis with pseudocyst around the pancreas extending to the mediastinum.Thrombotic vasculitis of the brachiocephalic to left brachial vein was observed,which could be the cause of left elbow pain.A pancreatic fistula was found in the head of the pancreas by endoscopic retrograde cholangiopancreatography,so a pancreatic cyst drainage tube via the duodenum was placed in the pseudocyst.Cyst content culture was positive for Escherichia coli infection.Clinical symptoms,imaging findings,and inflammatory reactions resolved gradually after starting therapeutic intervention.The mediastinal pancreatic pseudocysts shrunk,and the venous thrombi remained but shrunk.CONCLUSION The case of a patient with pancreatitis with an undetermined onset that mimics left arm cellulitis is reported.Deep vein thrombosis should be kept in mind when treating patients with severe inflammatory disease.

关键词： Pancreatic fistula Thrombotic vasculitis Pancreatitis Computed tomography Case report

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

A passive optical fibre sensor based on Fabry-Perot interferometry for bipolar electrostatic monitoring of insulating dielectrics

引用

High Voltage 2023年第4期8卷 682-689页

作者： Jiawei Zhang Zifan Ye Li Wang Zelei Zhang Fan Xu Weichen Dang takao Matsumoto Sombel Diaham Chatchai Putson School of Electrical Engineering Xi'an University of TechnologyXi'anShaanxiChina Universitéde Toulouse UPSINPTLAPLACE(Laboratoire Plasma et Conversion d'Energie)Toulouse Cedex 9France Materials Physics Laboratory Department of PhysicsFaculty of SciencePrince of Songkla University(PSU)SongkhlaThailand

The measurement of the surface charge on the insulating dielectrics is critical to estimate the insulation strength of electrical equipment in operation.Unavoidable interactions with the electromagnetic field,however,generally result in distortion measurement of active sensor.Thus,it is of great significance to investigate a passive sensor for monitoring the deposited charge.Here,a passive optical fibre electrostatic sensor is developed on the principle of Fabry–Perot interference to quantify the surface potential of the insulating dielectrics.The sensitivity of quantifying the electrostatic charge is explored in terms of the wavelength shift in the interference spectrum,and the linear correlation is 0.99.Meanwhile,the sensor can identify a negative quadratic trend with the increase of the surface roughness of the insulating dielectrics.The merits of the proposed sensor such as passive monitoring,bipolar electrostatic detection,and the excellent ability of antielectromagnetic interference are highlighted in the results.Hence,this sensor can serve as an effective tool to monitor the electrostatic charge in the fields of smart electrical equipment,fuel transportation,aerospace,integrate circuit etc.

关键词： electrostatic passive fibre

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

Evaluation of Mechanical Properties of Highly Filled Jute Fiber Reinforced Composites

引用

材料科学与工程（中英文A版） 2023年第4期13卷 104-111页

作者： takao Ota Department of Control Engineering National Institute of TechnologyNara College22 Yata-choYamatokoriyamaNara 639-1080Japan

This study aims for development of highly filled jute fiber reinforced composites that contains jute fiber over fiber weight fraction 60%,and jute fiber reinforced composite was fabricated by the hot-pressing method.The molding temperature was changed from 175°C to 230°C,to investigate the effect of molding temperature on the mechanical properties of jute fiber reinforced composites.The effect of surface treatment of jute fiber on the mechanical properties of jute fiber reinforced composites was also investigated.As a result,the jute fiber reinforced composites using surface treated fiber has low porosity,and the jute fiber reinforced composite having low porosity has high flexural strength and modulus.The jute fiber reinforced composite using acetone treated fiber molded at 200°C has the maximum flexural strength and modulus.

关键词： Natural fiber biodegradable plastics high fiber weight fraction surface treatment mechanical properties.

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：