检索结果-南通市图书馆

Effect of phosphorus fluctuation caused by river water dilution in eutrophic lake on competition between blue-green alga Microcystis aeruginosa and diatom Cyclotella sp.

引用

Journal of Environmental Sciences 2010年第11期22卷 1666-1673页

作者： Yoshimasa Amano Yusuke Sakai Takumi Sekiya Kimitaka Takeya Kazuo Taki motoi machida Graduate School of Engineering Chiba University Safety and Health Organization Chiba University Faculty of Engineering Chiba Institute of Technology

Tega-numa （Lake Tega） is one of the eutrophic lakes in Japan. For the improvement of water quality in Lake Tega, the North- chiba Water Conveyance Channel was constructed in 2000, which transfer water from Tone River into the lake. After 2000, the dominant species of diatoms, mainly Cyclotella sp., have been replacing blue-green algae, mainly Microcystis aeruginosa in Lake Tega. This transition of dominant species would be due to the dilution, but the detail mechanism has not been understood yet. This study examined the relationship between phosphorus fluctuation caused by river water dilution to Lake Tega and dominance of algal species, M. aeruginosa or Cyclotella sp. based on the single-species and the mixed-species culture experiments. The single-species culture experiment showed that the half-saturation constant and uptake rate of phosphorus were one order lower and seven times higher for M. aeruginosa than those for Cyclotella sp. These findings implied that M. aeruginosa would possess a potential for the growth and survival over Cyclotella sp. in the phosphorus limited condition. The superiority of M. aeruginosa was reflected in the outcome of the mixed-species culture experiment, i.e., dominance of M. aeruginosa, even phosphorus concentration was lowered to 0.01 mg-P/L. Therefore, it could be concluded that the decrease in phosphorus concentration due to the river water dilution to Lake Tega would be interpreted as a minor factor for the transition of dominant species from M. aeruginosa to Cyclotella sp.

关键词： eutrophic lake water quality improvement water blooms Microcystis aeruginosa Cyclotella sp.

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

Background diseases and the number of previous intravitreal aflibercept injections on immediate intraocular pressure increase and vitreous reflux rate in phakic eyes

引用

International Journal of Ophthalmology(English edition) 2024年第3期17卷 545-550页

作者： Tetsuya Muto Shigeki machida Shinichiro Imaizumi Department of Ophthalmology Dokkyo Medical University Saitama Medical CenterKoshigaya 343-8555Japan Imaizumi Eye Hospital Koriyama 963-8877Japan Fukushima Medical University Fukushima 960-1295Japan

●AIM:To evaluate the effect of background diseases and number of previous intravitreal aflibercept injections(IVAIs)on immediate intraocular pressure(IOP)increase and vitreous reflux(VR)rate and to evaluate the correlation of both age and axial length with immediate IOP increase and VR rate.●METHODS:This study included 105 patients with cystoid macular edema secondary to retinal vein occlusion,35 patients with diabetic macular edema,69 patients with neovascular age-related macular degeneration(nAMD),and 12 patients with myopic choroidal neovascularization,which underwent first-time *** correlation of immediate IOP increase and VR rates with the four background diseases was ***,the correlation of age with immediate IOP increase and VR rate as well as correlation of axial length with immediate IOP increase and VR rate were ***,54 patients with nAMD were treated with IVAI>10 times(multiple IVAIs).Moreover,the correlation of immediate IOP increase and VR rates with first-time and multiple IVAIs in nAMD was determined.●RESULTS:The immediate IOP increase(P=0.16)and VR rates(P=0.50)were almost similar among the four background *** immediate postinjection IOP and age,VR rate and age,immediate postinjection IOP and axial length,or VR rate and axial length were not correlated in the four background *** immediate IOP increase(P=0.66)and VR rates(P=0.28)did not significantly differ between first-time and multiple IVAIs in nAMD.●CONCLUSION:Background diseases and number of previous IVAIs have no effect on immediate IOP increase and VR ***,age and axial length have no correlation on immediate IOP increase and VR rate.

关键词： aflibercept intraocular pressure vitreous reflux intravitreal injection

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

Relationship between Helium Degassing of Cattle-Manure-Compost Adsorbents and Copper Ions Removal

引用

International Journal of Organic Chemistry 2012年第3期2卷 262-266页

作者： Muhammad Abbas Ahmad Zaini Mohd Azizi Che Yunus Yoshimasa Aman motoi machida Centre of Lipids Engineering & Applied Research Universiti Teknologi Malaysia Skudai Johor Malaysia Safety and Health Organization Chiba University Chiba Japan

This work was aimed to investigate the effect of helium degassing of cattle-manure-compost (CMC) based activated carbons on the adsorptive removal of copper ions from aqueous solution. Degassing temperatures were 500℃, 800℃ and 1000℃. Activated carbons were characterized according to surface chemistry and pore structures. Adsorption of copper ions was carried out using the conventional bottle-point technique to which the equilibrium data were correlated to Langmuir and Freundlich models. Results indicated that the uptake of copper ions could be well characterized by Langmuir model. It was found that the adsorption of copper ions decreased with significant decrease in surface area as a result of helium degassing at higher temperature. The increase of electron density on graphene layers offered higher affinity towards copper ions at lower equilibrium concentration. It was inferred that copper ions favorably adsorbed on mesopores at lower equilibrium concentration and switched to micropores at higher equilibrium concentration.

关键词： Activated Carbon Adsorption Copper Ions Cattle-Manure-Compost Helium Degassing

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

町田三郎先生的《管子》研究(二)

引用

管子学刊 2024年第2期 111-128页

作者： [日]町田三郎邓红(译) 北九州市立大学文学部日本福冈北九州802-0841

町田三郎是日本著名管子研究专家,他的《管子》研究成果之二即《町田三郎先生的〈管子〉研究(二)》包括以下两篇文章:第一篇,《关于〈管子〉“轻重篇”》。作者认为“轻重篇”是《管子》“对形而上世界的抛弃和对形而下世界的肯定”,大... 详细信息

町田三郎是日本著名管子研究专家,他的《管子》研究成果之二即《町田三郎先生的〈管子〉研究(二)》包括以下两篇文章:第一篇,《关于〈管子〉“轻重篇”》。作者认为“轻重篇”是《管子》“对形而上世界的抛弃和对形而下世界的肯定”,大致产生于西汉初期出现大规模饥馑的时代,并最终形成于吕后时代至文、景盛世。“轻重篇”虽然不否定强本节用的积极作用,但认为由国家运用轻重政策加强经济流通的治世效果更好。值得注意的是,作者认为“轻重篇”产生的政权并非西汉中央集权,而是地方侯国——齐国。第二篇,《〈管子〉的思想——以“外言类”为中心》。作者认为这部分内容有四个特点:一是“外言”八篇都掺杂有诸家思想,二是以君臣之分、强调秩序为主,三是重视对政治的道义性反省和对政治本身的思索,四是内在潜伏着对土地和经济的强烈关心。作者强调“外言篇”的理论根据在于“中”的概念。

关键词：町田三郎《管子》研究 “轻重篇” “外言类”

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

Relationship between Helium Degassing of Cattle-Manure-Compost Adsorbents and Copper Ions Removal

引用

International Journal of Organic Chemistry（有机化学国际期刊） 2012年第3期

作者： Muhammad Abbas Ahmad Zaini Mohd Azizi Che Yunus Yoshimasa Aman motoi machida

来源：评论

学校读者我要写书评

暂无评论

On fluorescence imaging:The diffusion equation model and recovery of the absorption coefficient of fluorophores

引用

Science China Mathematics 2022年第6期65卷 1179-1198页

作者： Jijun Liu Manabu machida Gen Nakamura Goro Nishimura Chunlong Sun School of Mathematics Southeast UniversityNanjing 210096China Institute for Medical Photonics Research Hamamatsu University School of MedicineHamamatsu 431-3192Japan Department of Mathematics Hokkaido UniversitySapporo 060-0810Japan Research Institute for Electronic Science Hokkaido UniversitySapporo 060-0810Japan

To quantify fluorescence imaging of biological tissues,we need to solve an inverse problem for the coupled radiative transfer equations which describe the excitation and emission fields in biological *** begin by giving a concise mathematical argument to derive coupled diffusion equations with the Robin boundary condition as an approximation of the radiative transfer *** by using this coupled system of equations as a model for the fluorescence imaging,we have a nonlinear inverse problem to identify the absorption coefficient in this *** associated linearized inverse problem is to ignore the absorbing effect on the excitation *** firstly establish the estimates of errors on the excitation field and the solution to the inverse problem,which ensures the reasonability of the model approximation *** numerical verification is presented to show the validity of such a linearizing process ***,based on the analytic expressions of excitation and emission fields,the identifiability of the absorption coefficient from the linearized inverse problem is rigorously analyzed for the absorption coefficient in the special form,revealing the physical difficulty of the3-dimensional imaging model by the back scattering diffusive system.

关键词： fluorescence imaging diffusion equation inverse problem linearization error estimates identifiability

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

Microwave Behavior of α-Fe/Fe_3B/Y_2O_3 Nanocomposites in GHz Range Prepared by Melt-Spun Technique

引用

Journal of Rare Earths 2004年第1期22卷 13-16页

作者： Masahiro Itoh Ken-ichi machida Collaborative Research Center for Advanced Science and Technology Collaborative Research Center for Advanced Science and Technology Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 JapanOsaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan

Nanocomposites α-Fe/Fe 3B/Y 2O 3 were prepared by a melt-spun technique, and the electromagnetic wave absorption properties were measured in the 0 05～20 05 GHz range. Compared with α-Fe/Y 2O 3 composites, the resonance frequency (f r) of α-Fe/Fe 3B/Y 2O 3 shifted to a higher frequency range due to the large anisotropy field (H A) of tetragonal Fe 3B (～0 4 mA·m -1). The relative permittivity (ε r=ε r′-jε r″) was constantly low over the 0 5～10 GHz region, which indicates that the composite powders have a high resistivity (ρ=～100 Ωm). The effective electromagnetic wave absorption (RL<-20 dB) was obtained in a frequency range of 2.7～6.5 GHz on resin composites of 80% (mass fraction) α-Fe/Fe 3B/Y 2O 3 powders, with thickness of 6～3 mm respectively. A minimum reflection loss of -33 dB was observed at 4.5 GHz with an absorber thickness of 4 mm.

关键词： melt-spun nanocomposites electromagnetic wave absorption anisotropy field matching frequency

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

Crystal Structure of Arabidopsis thaliana Dawdle Forkhead-Associated Domain Reveals a Conserved Phospho-Threonine Recognition Cleft for Dicer-Like 1 Binding

引用

Molecular Plant 2013年第4期6卷 1290-1300页

作者： Satoru machida Y.Adam Yuan Department of Biological Sciences and Centre for Bioimaging Sciences National University of Singapore 14 Science Drive 4 Singapore 117543 Singapore Temasek Lifesciences Laboratory National University of Singapore 1 Research Link Singapore 117604 Singapore Mechanobiology Institute National University of Singapore T-lab Building 5A Engineering Drive 1 Singapore 117411 Singapore

Dawdle （DDL） is a microRNA processing protein essential for the development of Arabidopsis. DDL contains a putative nuclear localization signal at its amino-terminus and forkhead-associated （FHA） domain at the carboxyl-termi- nus. Here, we report the crystal structure of the FHA domain of Arabidopsis Dawdle, determined by multiple-wavelength anomalous dispersion method at 1.7-A resolution. DDL FHA structure displays a seven-stranded 13-sandwich architec- ture that contains a unique structural motif comprising two long anti-parallel strands. Strikingly, crystal packing of the DDL FHA domain reveals that a glutamate residue from the symmetry-related DDL FHA domain, a structural mimic of the phospho-threonine, is specifically recognized by the structurally conserved phospho-threonine binding cleft. Consistently with the structural observations, co-immuno-precipitation experiments performed in Nicotiana benthami- ana show that the DDL FHA domain co-immuno-precipitates with DCL1 fragments containing the predicted pThr＋3（lle/ Val/Leu/Asp） motif. Taken together, we count the recognition of the target residue by the canonical binding cleft of the DDL FHA domain as the key molecular event to instate FHA domain-mediated protein-protein interaction in plant miRNA processing.

关键词： Arabidopsis DCL1 Arabidopsis DDL forkhead-associated domain phospho-threonine microRNA processing.

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

Magnetic Properties of Nd-Fe-B Sintered Magnet Powders Recovered by Yb Metal Vapor Sorption

引用

Journal of Rare Earths 2004年第1期22卷 152-156页

作者： Horikawa T Itoh M Suzuki Shunji machida K Collaborative Research Center for Advanced Science and Technology Collaborative Research Center for Advanced Science and TechnologyCollaborative Research Center for Advanced Science and TechnologyCollaborative Research Center for Advanced Science and Technology Osaka University Osaka 565-0871 Japan Osaka University Osaka 565-0871 Japan Osaka University Osaka 565-0871 Japan Osaka University Osaka 565-0871 Japan

Fine ground powders of Nd-Fe-B sintered magnet bulks (particle size=46～125 μm in diameter) were coated and alloyed with Yb metal by sorbing them. A significant recovery of the decreased magnetic properties of the ground powders (remanence B r=～0.95 T, coercivity H cj =～227 kA·m -1 and maximum energy product (BH) max=～48 8 kJ·m -3) was observed in accordance with increasing temperature up to 800 ℃. The sorbing temperature and time for Yb metal vapor were optimized and after heating at 800 ℃ for 90 min and annealing subsequently at 610 ℃ for 60 min, the B r, H cj and (BH) max values were increased to be 0.98 T, 712 kA·m -1 and 173 kJ·m -3, respectively. From the microstructural characterizations of resulting samples by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe X-ray microanalyzer (EPMA), it is found that the sorbed Yb metal uniformly covers the surface and diffuses to the Nd-rich grain boundary of fine ground powders of Nd-Fe-B sintered magnet bulks forming a (Nd,Yb)Fe 2 phase.

关键词： metal materials Nd 2Fe 14B sintered magnets metal vapor sorption magnetic properties recovery rare earths

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

Synthesis and luminescent properties of low oxygen contained Eu^(2+)-doped Ca-α-SiAlON phosphor from calcium cyanamide reduction

引用

Journal of Rare Earths 2008年第2期26卷 198-202页

作者： PIAO Xianqing Ken-ichi machida Takashi Horikawa Hiromasa Hanzawa Center for Advanced Science and Innovation Osaka University 2-1 Yamadaoka Suita

A new convenient calcium cyanamide （CaCN2） reduction route was developed to synthesize the Eu^2＋ activated Ca-α-SiAION phosphors containing low oxygen content. The luminescence properties of the obtained products were investigated for white LEDs application. The critical Eu^2＋ concentration in various hosts and its effect on the photoluminescence properties were studied. The optimized sample （10at.% Eu^2＋ vs. Ca^2＋） could be efficiently excited by the current GaN/InGaN blue LED chips and provided emission intensity competitive with that of YAG：Ce^3＋（P46-Y3） standard, revealing that this phosphor was a potential candidate for phosphor-converted white LEDs.

关键词： nitride phosphor white LEDs SiAION Eu^2+ CaCN2 rare earths

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

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

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

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：