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Gunn器件中畴的静止-渡越-静止模式的实验观察和计算机模拟
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作者 王守武 郑一阳 +1 位作者 郗小林 张进昌 《Journal of Semiconductors》 EI CAS 1983年第4期321-333,共13页
本文讨论在GaAs n^+-n-n^+夹层结构的Cunn器件中畴的静止-渡越-静止模式,进行了实验观察和计算机模拟,指出在超过阈值的偏置电压下,当畴的耗尽层进入阳极附近的高掺杂区后,会逐渐停止下来形成准静态畴,这时畴外电场达到最大值.如果这时... 本文讨论在GaAs n^+-n-n^+夹层结构的Cunn器件中畴的静止-渡越-静止模式,进行了实验观察和计算机模拟,指出在超过阈值的偏置电压下,当畴的耗尽层进入阳极附近的高掺杂区后,会逐渐停止下来形成准静态畴,这时畴外电场达到最大值.如果这时阴极凹口仍不能形成新畴,则准静态畴将进一步调整成为真正的静止畴,而畴外电场也将由最大值下降到一个与偏压无关的固定值.经过理论分析,得到了静止畴所固有的与外加偏压无关的畴外电场与有源区掺杂浓度的关系式,并和计算机模拟的结果相比较,得到很好的符合.如果偏压的增加使准静态畴所对应的畴外电场最大值已经足够使阴极凹口形成新的畴,则静止畴将转变为渡越畴.如果偏压继续增加,使积累层尾部覆盖了阴极凹口,则畴会再次静止下来,直到偏压增加到畴发生雪崩为止.计算和实验表明,后一个静止区的电压变化范围要比前一个大得多.本文还讨论了两个转变电压和温度的关系及扩散系数对静止畴的影响. 展开更多
关键词 The TRAnSFORMATIOnS between stationary and TRAnSIT DOMAInS in a GUnn device which has n^+-n-n^+ SAnDWICH structure with doping gradient near the anode are investigated.Experimental observation computer simulation carried out.When th
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Model of Universe as Described by Dynamic Universe Model
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作者 Satyavarapu Naga Parameswara Gupta 《Open Journal of Modelling and Simulation》 2019年第1期41-78,共38页
In this paper we will see the model of Universe according to Dynamic Universe Model of Cosmology by visualizing various processes that are happening in the Universe as per experimental evidences. For simplifying the m... In this paper we will see the model of Universe according to Dynamic Universe Model of Cosmology by visualizing various processes that are happening in the Universe as per experimental evidences. For simplifying the matter here, we will see in part 1: about the Galaxy life cycle, where the birth and death of Galaxies discussed. Probably Universe gives guidance for the movement of Galaxies. We call this Part 1: Thinking and Reproducing Universe or Mindless Universe? (Galaxy life cycle). We see every day Sun, Stars, Galaxies etc., dissipating enormous energy in the form of radiation by the way of fusion of Hydrogen to helium. So after sometime all the Hydrogen is spent and Universe will die, is it not? … Dynamic Universe Model says that the energy in the form of electromagnetic radiation passing grazingly near any gravitating mass changes in frequency and finally will convert into neutrinos (mass). Hence Dynamic Universe Model proposes another process where energy will be converted back into matter and the cycle energy to mass to energy continues, sustaining the Universe to maintain this present status for ever in this form something like a Steady state model without any expansion. This we will see in Part 2: Energy - Mass - Energy Cycle. After converting energy into mass “how various elements are formed and where they are formed?” will be next logical question. Dynamic Universe Model says that these various particles change into higher massive particles or may get bombarded into stars or planets and various elements are formed. Here we bifurcate the formation of elements into 6 processes. They are for Elementary particles and elements generated in frequency changing process, By Cosmic rays, By Small stars, By Large Stars, By Super Novae and Manmade elements By Neutron Stars. This we will discuss in Part 3: Nucleosynthesis. 展开更多
关键词 DYnAMIC UnIVERSE MODEL Hubble Space Telescope (HST) SITA Simulations (SITA-Simulation of Inter Intra Tautness Attraction Forces Used by DYnAMIC UnIVERSE Model) Singularity-Free COSMOLOGY Blue Shifted GALAXIES Red Shifted GALAXIES Grazing Radiation Frequency Changes Formation of Elements nucleosynthesis DYnAMIC UnIVERSE MODEL Energy to Mass Conversion Methods: n-Body Simulations-Gravitation-Cosmology
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4,4′-N,N′-二苯甲烷双柠康酰亚胺的合成与表征 被引量:3
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作者 刘应玖 王洛礼 《化工生产与技术》 CAS 2009年第4期16-19,33,共5页
柠康酸酐与4,4′-N,N′-二氨基二苯甲烷反应得到4,4′-N,N′-二苯甲烷双柠康酰胺酸(AMIC),再以共沸脱水法制得4,4′-N,N′-二苯甲烷双柠康酰亚胺(BCI)。结果表明,柠康酸酐与MDA的反应以温度35~40℃、每摩尔MDA配溶剂2.5L为佳。利用傅... 柠康酸酐与4,4′-N,N′-二氨基二苯甲烷反应得到4,4′-N,N′-二苯甲烷双柠康酰胺酸(AMIC),再以共沸脱水法制得4,4′-N,N′-二苯甲烷双柠康酰亚胺(BCI)。结果表明,柠康酸酐与MDA的反应以温度35~40℃、每摩尔MDA配溶剂2.5L为佳。利用傅立叶转换红外光谱仪、核磁共振仪、元素分析仪和差示量热计等仪器对BCI进行了表征,证明与预想结构相符。选定的合成条件有效地克服了转位副反应,是制备BCI的一条较好的工艺路线。所得BCI纯度高达94%,其固化物有较好的耐热性。 展开更多
关键词 4 4′-n n′-二苯甲烷双柠康酰亚胺 柠康酸酐 4 4′-/-n n′-二氨基二苯甲烷 4 4′-n n′-二苯甲烷双柠康酰胺酸 合成 表征
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复方氨基酸注射液中有关物质N,N′-二乙酰-L-胱氨酸测定
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作者 祝艺娟 罗倩倩 +2 位作者 方海顺 杜碧莹 苏广海 《中国药品标准》 CAS 2024年第3期273-276,共4页
目的:建立测定复方氨基酸注射液中乙酰半胱氨酸有关物质N,N′-二乙酰-L-胱氨酸含量的高效液相色谱法。方法:采用Atlantis dC_(18)色谱柱(4.6 mm×150 mm,3μm),以甲酸铵溶液(取甲酸铵315 mg,加水960 mL溶解,摇匀)-乙腈-甲酸(970∶30... 目的:建立测定复方氨基酸注射液中乙酰半胱氨酸有关物质N,N′-二乙酰-L-胱氨酸含量的高效液相色谱法。方法:采用Atlantis dC_(18)色谱柱(4.6 mm×150 mm,3μm),以甲酸铵溶液(取甲酸铵315 mg,加水960 mL溶解,摇匀)-乙腈-甲酸(970∶30∶1)为流动相,流速为0.7 mL·min^(-1),检测波长为210 nm。结果:N,N′-二乙酰-L-胱氨酸浓度在2.697~53.94μg·mL^(-1)范围内线性关系良好(r=0.9999),检测限和定量限分别为1.4μg·mL^(-1)和4.4μg·mL^(-1),平均回收率为100.2%,RSD为0.5%。结论:经方法学验证,证明本法适用于复方氨基酸注射液中N,N′-二乙酰-L-胱氨酸的含量测定。 展开更多
关键词 高效液相色谱法 复方氨基酸注射液 n n′-二乙酰-L-胱氨酸 有关物质
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N-异海松酰基-N′-芳杂环基硫脲类衍生物的合成及生物活性
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作者 卢言菊 陈玉湘 +2 位作者 王婧 徐士超 黄申林 《林业工程学报》 CSCD 北大核心 2024年第3期69-76,共8页
为得到潜在的新型抑菌剂和抗肿瘤药物,笔者以异海松酸为原料,先与草酰氯反应制备得到异海松酰氯,后与硫氰化钾反应生成异海松酰基异硫氰酸酯,在此基础上与不同杂环取代胺反应,设计并合成了10个新型N-异海松酰基-N′-芳杂环基硫脲类衍生... 为得到潜在的新型抑菌剂和抗肿瘤药物,笔者以异海松酸为原料,先与草酰氯反应制备得到异海松酰氯,后与硫氰化钾反应生成异海松酰基异硫氰酸酯,在此基础上与不同杂环取代胺反应,设计并合成了10个新型N-异海松酰基-N′-芳杂环基硫脲类衍生物4a~4j,采用傅里叶红外光谱(FT-IR)、氢核磁共振(1H NMR)、碳核磁共振(13C NMR)和质谱(MS)等手段确定了目标化合物的结构,研究了N-异海松酰基-N′-芳杂环基硫脲类衍生物的抑菌及抗肿瘤活性。研究结果表明,大部分N-异海松酰基-N′-芳杂环基硫脲类衍生物对金黄色葡萄球菌都具有良好的抑菌活性,其中化合物4b、4c、4d、4e和4f对金黄色葡萄球菌的最低抑菌质量浓度达到0.98μg/mL,优于对照物青霉素钠,其中化合物4h的最低抑菌质量浓度也达到15.60μg/mL;化合物4i和4j的最低抑菌质量浓度为31.30μg/mL,大部分衍生物对樟子松枯梢病菌和无壳异担子菌无明显的抑菌活性。在浓度为100μmol/L时,部分N-异海松酰基-N′-芳杂环基硫脲类衍生物具有较好的抗肿瘤活性,化合物4f和4g对肝癌细胞的体外抑制率分别为68.59%和82.30%,化合物4g对宫颈癌细胞、前列腺癌细胞和乳腺癌细胞的体外抑制率分别为80.74%、71.21%和62.14%。 展开更多
关键词 异海松酸 n′-芳杂环硫脲类化合物 合成 抑菌活性 抗肿瘤活性
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手性磷酸催化非环状N,N′-缩酮的不对称合成
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作者 李敏 李文哲 +1 位作者 黄敏 张晓梅 《合成化学》 CAS 2024年第7期634-642,共9页
手性N,N′-缩酮是药物分子和生物活性化合物最重要的核心结构之一,也是有机合成中重要的催化剂或配体。因此,不对称合成N,N′-缩酮具有重要意义。通过手性磷酸、溶剂、催化剂负载量和投料比的筛选,确定了最佳的反应条件:在手性磷酸的催... 手性N,N′-缩酮是药物分子和生物活性化合物最重要的核心结构之一,也是有机合成中重要的催化剂或配体。因此,不对称合成N,N′-缩酮具有重要意义。通过手性磷酸、溶剂、催化剂负载量和投料比的筛选,确定了最佳的反应条件:在手性磷酸的催化下,以1,4-二氧六环作为溶剂,5-氨基异噁唑与β,γ-炔基-α-酮亚胺酯在室温下发生区域选择性的氮杂-曼尼希反应,实现异噁唑的不对称N—H烷基化,以中等至良好的收率(46%~83% yield)和较好的对映选择性(82%~92%ee)合成非环状的N,N′-缩酮。所有产物结构由^(1)H NMR,^(13)C NMR和HR-MS(ESI)确证,绝对构型通过X-射线晶体结构分析确定。 展开更多
关键词 n n′-缩酮 手性磷酸催化 5-氨基异噁唑 β γ-炔基-α-酮亚胺酯 区域选择性 不对称合成 氮杂-曼尼希反应
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Antibodies elicited by Newcastle disease virus-vectored H7N9 avian influenza vaccine are functional in activating the complement system
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作者 Zenglei Hu Ya Huang +3 位作者 Jiao Hu Xiaoquan Wang Shunlin Hu Xiufan Liu 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2024年第6期2052-2064,共13页
H7N9 subtype avian influenza virus poses a great challenge for poultry industry.Newcastle disease virus(NDV)-vectored H7N9 avian influenza vaccines(NDV_(vec)H7N9)are effective in disease control because they are prote... H7N9 subtype avian influenza virus poses a great challenge for poultry industry.Newcastle disease virus(NDV)-vectored H7N9 avian influenza vaccines(NDV_(vec)H7N9)are effective in disease control because they are protective and allow mass administration.Of note,these vaccines elicit undetectable H7N9-specific hemagglutination-inhibition(HI)but high IgG antibodies in chickens.However,the molecular basis and protective mechanism underlying this particular antibody immunity remain unclear.Herein,immunization with an NDV_(vec)H7N9 induced low anti-H7N9 HI and virus neutralization titers but high levels of hemagglutinin(HA)-binding IgG antibodies in chickens.Three residues(S150,G151 and S152)in HA of H7N9 virus were identified as the dominant epitopes recognized by the NDV_(vec)H7N9 immune serum.Passively transferred NDV_(vec)H7N9 immune serum conferred complete protection against H7N9 virus infection in chickens.The NDV_(vec)H7N9 immune serum can mediate a potent lysis of HA-expressing and H7N9 virus-infected cells and significantly suppress H7N9 virus infectivity.These activities of the serum were significantly impaired after heat-inactivation or treatment with complement inhibitor,suggesting the engagement of the complement system.Moreover,mutations in the 150-SGS-152 sites in HA resulted in significant reductions in cell lysis and virus neutralization mediated by the NDV_(vec)H7N9 immune serum,indicating the requirement of antibody-antigen binding for complement activity.Therefore,antibodies induced by the NDV_(vec)H7N9 can activate antibody-dependent complement-mediated lysis of H7N9 virus-infected cells and complement-mediated neutralization of H7N9 virus.Our findings unveiled a novel role of the complement in protection conferred by the NDV_(vec)H7N9,highlighting a potential benefit of engaging the complement system in H7N9 vaccine design. 展开更多
关键词 H7n9 subtype avian influenza virus nDV vector vaccine antibody immunity COMPLEMEnT protection
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The Collaboratory for the Study of Earthquake Predictability in China:Experiment Design and Preliminary Results of CSEP2.0
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作者 ZHANG Shengfeng ZHANG Yongxian +3 位作者 Maximilian J.WERNER Kenny G.RAHAM David A.RHOADES JoséA.BAYONA 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2024年第S01期94-97,共4页
Since the inaugural international collaboration under the framework of the Collaboratory for the Study of Earthquake Predictability(CSEP)in 2007,numerous forecast models have been developed and operated for earthquake... Since the inaugural international collaboration under the framework of the Collaboratory for the Study of Earthquake Predictability(CSEP)in 2007,numerous forecast models have been developed and operated for earthquake forecasting experiments across CSEP testing centers(Schorlemmer et al.,2018).Over more than a decade,efforts to compare forecasts with observed earthquakes using numerous statistical test methods and insights into earthquake predictability,which have become a highlight of the CSEP platform. 展开更多
关键词 earthquake forecasting seismicity modeling CSEP2.0 Pattern Informatics(PI)algorithm long-to-intermediate-term forecast Relative Intensity(RI)algorithm Completeness Magnitude S test n test
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Synthesis and Characterization of Hydrogels Based on Potato Starch/Poly(vinyl Alcohol)/N,N′-Methylenebisacrylamide
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作者 Diego David Pinzón-Moreno Eder Clidio Vicuña-Galindo +2 位作者 JoséVulfrano González-Fernández JoséLuis Soto-Gonzales María Verónica Carranza-Oropeza 《Journal of Renewable Materials》 SCIE EI 2022年第8期2179-2201,共23页
Several hydrogels were synthesized by free-radical polymerization in an aqueous medium based on potato starch(PS),poly(vinyl alcohol)(PVA),and N,N′-Methylenebisacrylamide(MBAm),being possible to study these hydrogels... Several hydrogels were synthesized by free-radical polymerization in an aqueous medium based on potato starch(PS),poly(vinyl alcohol)(PVA),and N,N′-Methylenebisacrylamide(MBAm),being possible to study these hydrogels as a function of the proportion of components incorporated.In this way,the products generated from the synthesis were characterized by swelling and deswelling kinetics,the first swelling being verified with Schott and statistical models,allowing to contrast the proximity between the experimental and theoretical behavior.Additionally,water retention in soil(R%),spectroscopy(FTIR),morphological(SEM),and thermal(TGA and DSC)analysis allowing to know the intrinsic characteristics of the material,increasing in general terms the knowledge of this type of material.In this context,it was possible to verify the characteristics and effectiveness of the synthesis and crosslinking of the main components.The experimental results obtained show that the synthesized hydrogels present representative swellings consistent with kinetic and statistical models,optimal thermal stability depending on the amount of crosslinker,and excellent water retention in environments such as soil,presenting it as an excellent alternative to be used in agro-industrial applications in an eco-friendly way. 展开更多
关键词 HYDROGEL potato starch polyvinyl alcohol n n′-Methylenebisacrylamide kinetic swelling and deswelling water retention thermal characterization morphology characterization
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Electroless copper plating process of N, N, N, N′-tetrakis (2-hydroxypropyl) ethylenediamine system with high plating rate
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作者 ZHENG Ya-jie ZOU Wei-hong YI Dan-qing GONG Zhu-qing LI Xin-hai 《Journal of Central South University of Technology》 2005年第z1期82-87,共6页
Electroless copper plating process of N, N, N′, N′-tetrakis (2-hydroxypropyl)ethylenediamine(THPED) chelating agent was researched comprehensively. The results indicate that plating rate decreases with the 3H2O has ... Electroless copper plating process of N, N, N′, N′-tetrakis (2-hydroxypropyl)ethylenediamine(THPED) chelating agent was researched comprehensively. The results indicate that plating rate decreases with the 3H2O has a bad effect on deposits quality, but 2, 2′-dipyridyl and PEG make deposits quality improve greatly. Low concentration of 2-mercaptobenzothiozole (2-MBT) increases plating rate and improves deposits quality, but decreases plating rate and worsens deposits quality when 2-MBT reaches 5 mg/L. The optimal conditions of this electroless MBT are 16.8 g/L, 16.0 mL/L, 13.3 g/L, 0.5 g/L, 5.0 mg/L and 2.0 mg/L, respectively, pH value is 12.75,bath temperature is 30 ℃. Plating rate reaches 9.54 μm/h plating for 30 min in the bath. The SEM images demonstrate that the surface of copper film is smooth and the crystal is fine. 展开更多
关键词 ELECTROLESS copper PLATInG PLATInG RATE n n n′ n′-tetrakis(2-hydroxypropl) ETHYLEnEDIAMInE additive
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Optical properties for N,N’-bis (lnaphyhly)N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine and tris (8-hydroxyquinolinato) aluminum in organic light emitting devices 被引量:1
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作者 Mei Yee Lim Wan Mahmood Mat Yunus +1 位作者 Zainal Abidin Talib Anuar Kassim 《Natural Science》 2010年第6期631-634,共4页
The optical properties of N,N’-bis (Inaphthyl)N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) and tris (8-hydroxyquinolinato) aluminum (Alq3) organic materials used as hole transport and electron transport layers i... The optical properties of N,N’-bis (Inaphthyl)N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) and tris (8-hydroxyquinolinato) aluminum (Alq3) organic materials used as hole transport and electron transport layers in organic light-emitting devices (OLED) have been investigated. The NPB and Alq3 layers were prepared using thermal evaporation method. The results show that the energy band gap of Alq3 is thickness independence while the energy band gap of NPB decreases with the increasing of sample thickness. For the case of photoluminescence the Alq3 with thickness of 84 nm shows the highest relative intensity peak at 510 nm. 展开更多
关键词 Energy Band Gap n n’-Bis (Inaphthyl) -n n’-Diphenyl-1 1’-Biphenyl-4 4’-Diamine Tris (8 Hydroxyquinolinato) Aluminum Organic Light Emitting Diode Photoluminescence
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Exploring the effect of aggregation-induced emission on the excited state intramolecular proton transfer for a bis-imine derivative by quantum mechanics and our own n-layered integrated molecular orbital and molecular mechanics calculations
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作者 Huifang Zhao Chaofan Sun +2 位作者 Xiaochun Liu Hang Yin Ying Shi 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第1期645-649,共5页
We theoretically investigate the excited state intramolecular proton transfer(ESIPT) behavior of the novel fluorophore bis-imine derivative molecule HNP which was designed based on the intersection of 1-(hydrazonometh... We theoretically investigate the excited state intramolecular proton transfer(ESIPT) behavior of the novel fluorophore bis-imine derivative molecule HNP which was designed based on the intersection of 1-(hydrazonomethyl)-naphthalene-2-ol and 1-pyrenecarboxaldehyde. Especially, the density functional theory(DFT) and time-dependent density functional theory(TDDFT) methods for HNP monomer are introduced. Moreover, the "our own n-layered integrated molecular orbital and molecular mechanics"(ONIOM) method(TDDFT:universal force field(UFF)) is used to reveal the aggregation-induced emission(AIE) effect on the ESIPT process for HNP in crystal. Our results confirm that the ESIPT process happens upon the photoexcitation for the HNP monomer and HNP in crystal, which is distinctly monitored by the optimized geometric structures and the potential energy curves. In addition, the results of potential energy curves reveal that the ESIPT process in HNP will be promoted by the AIE effect. Furthermore, the highest occupied molecular orbital(HOMO) and lowest unoccupied molecular orbital(LUMO) for the HNP monomer and HNP in crystal have been calculated. The calculation demonstrates that the electron density decrease of proton donor caused by excitation promotes the ESIPT process. In addition, we find that the variation of atomic dipole moment corrected Hirshfeld population(ADCH) charge for proton acceptor induced by the AIE effect facilitates the ESIPT process. The results will be expected to deepen the understanding of ESIPT dynamics for luminophore under the AIE effect and provide insight into future design of high-efficient AIE compounds. 展开更多
关键词 time-dependent density functional theory(TDDFT) METHOD excited state intramolecular proton transfer(ESIPT) our own n-layered integrated MOLECULAR orbital and MOLECULAR mechanics(OnIOM) METHOD potential energy curves atomic dipole moment corrected Hirshfeld population(ADCH) charge
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Pattern of disharmony between the heart and kidney: Theoretical basis, identification and treatment
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作者 Jian Dong Tianfang Wang +1 位作者 Lihong Zhao Xinran Chen 《Journal of Traditional Chinese Medical Sciences》 2017年第4期317-321,共5页
'Harmony between the heart and kidney' refers to the physiological relationship between these two zang organs in Chinese medicine,while 'disharmony between the heart and kidney' (also called disharmony... 'Harmony between the heart and kidney' refers to the physiological relationship between these two zang organs in Chinese medicine,while 'disharmony between the heart and kidney' (also called disharmony between fire and water) refers to the pathological state.The pattern of disharmony between the heart and kidney is widely observed in patients with insomnia,anxiety disorder and menopausal syndrome,etc..In order to gain a full and systematical understanding of this pattern,from the perspective of ancient Chinese philosophy and zang-fu theory in Chinese medicine,we systematically reviewed and discussed the functions and physiological characteristics of the heart and kidney,the origin and development of theories relating to heart-kidney relationship,the pathogenesis and identification of the pattern,as well as the commonly used classical formulas for its treatment,including Coptis and DonkeyHide Gelatin Decoction (Huánglián (E)jiāo Tāng) and Grand Communication Pill (Jiāotài Wán).Two examples of clinical modifications of these formulas in the treatment of insomnia and menopausal syndrome are provided in this article.It should be noted that in clinical practice,these formulas should be used flexibly,and modified in accordance to the condition of the patient. 展开更多
关键词 Harmony BETWEEn the HEART and KIDnEY Disharmony BETWEEn the HEART and KIDnEY PATTERn of disharmony BETWEEn the HEART and KIDnEY Coptis and Donkey-Hide Gelatin Decoction (Huánglián (E)jiāo ng) Grand Communication Pill (Jiāotài n)
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二氧化硅负载N,N,N′,N′-四甲基-N″-丙基胍盐离子液体的制备及结构表征
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作者 孙帅 郑金颖 +2 位作者 安华良 赵新强 王延吉 《精细石油化工》 CAS CSCD 北大核心 2012年第3期22-27,共6页
采用不同方法制备了阴离子分别为PF6-,CF3SO3-和CH3COO-的二氧化硅负载N,N,N′,N′-四甲基-N″-丙基胍(STMPG)离子液体,利用FT-IR,BET和元素分析等方法对上述负载型离子液体及其前体进行了结构表征,并测定了负载型离子液体的表面酸碱性... 采用不同方法制备了阴离子分别为PF6-,CF3SO3-和CH3COO-的二氧化硅负载N,N,N′,N′-四甲基-N″-丙基胍(STMPG)离子液体,利用FT-IR,BET和元素分析等方法对上述负载型离子液体及其前体进行了结构表征,并测定了负载型离子液体的表面酸碱性,其中[STMPG]CH3COO的pKa值最高,为4.8~6.8。 展开更多
关键词 二氧化硅 氯丙基功能化的二氧化硅 n n n′ n′-四甲基-n″-丙基三乙氧基硅基胍 负载型n n n′ n′-四甲基-n″-丙基胍 负载型n n n′ n′-四甲基-n″-丙基胍盐离子液体
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Dysregulation of RNA modification systems in clinical populations with neurocognitive disorders 被引量:4
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作者 Helen M.Knight Merve DemirbugenÖz Adriana PerezGrovas-Saltijeral 《Neural Regeneration Research》 SCIE CAS CSCD 2024年第6期1256-1261,共6页
The study of modified RNA known as epitranscriptomics has become increasingly relevant in our understanding of disease-modifying mechanisms.Methylation of N6 adenosine(m^(6)A)and C5 cytosine(m^(5)C)bases occur on mRNA... The study of modified RNA known as epitranscriptomics has become increasingly relevant in our understanding of disease-modifying mechanisms.Methylation of N6 adenosine(m^(6)A)and C5 cytosine(m^(5)C)bases occur on mRNAs,tRNA,mt-tRNA,and rRNA species as well as non-coding RNAs.With emerging knowledge of RNA binding proteins that act as writer,reader,and eraser effector proteins,comes a new understanding of physiological processes controlled by these systems.Such processes when spatiotemporally disrupted within cellular nanodomains in highly specialized tissues such as the brain,give rise to different forms of disease.In this review,we discuss accumulating evidence that changes in the m^(6)A and m^(5)C methylation systems contribute to neurocognitive disorders.Early studies first identified mutations within FMR1 to cause intellectual disability Fragile X syndromes several years before FMR1 was identified as an m^(6)A RNA reader protein.Subsequently,familial mutations within the m^(6)A writer gene METTL5,m^(5)C writer genes NSUN2,NSUN3,NSUN5,and NSUN6,as well as THOC2 and THOC6 that form a protein complex with the m^(5)C reader protein ALYREF,were recognized to cause intellectual development disorders.Similarly,differences in expression of the m^(5)C writer and reader effector proteins,NSUN6,NSUN7,and ALYREF in brain tissue are indicated in individuals with Alzheimer's disease,individuals with a high neuropathological load or have suffered traumatic brain injury.Likewise,an abundance of m^(6)A reader and anti-reader proteins are reported to change across brain regions in Lewy bodies diseases,Alzheimer's disease,and individuals with high cognitive reserve.m^(6)A-modified RNAs are also reported significantly more abundant in dementia with Lewy bodies brain tissue but significantly reduced in Parkinson's disease tissue,whilst modified RNAs are misplaced within diseased cells,particularly where synapses are located.In parahippocampal brain tissue,m^(6)A modification is enriched in transcripts associated with psychiatric disorders including conditions with clear cognitive deficits.These findings indicate a diverse set of molecular mechanisms are influenced by RNA methylation systems that can cause neuronal and synaptic dysfunction underlying neurocognitive disorders.Targeting these RNA modification systems brings new prospects for neural regenerative therapies. 展开更多
关键词 5-methylcytosine methylation Alzheimer's disease cognitive diseases epitranscriptomics intellectual disability Lewy body diseases n6 adenosine RnA modification
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Estrogen affects neuropathic pain through upregulating N-methyl-D-aspartate acid receptor 1 expression in the dorsal root ganglion of rats 被引量:8
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作者 Chao Deng Ya-juan Gu +1 位作者 Hong Zhang Jun Zhang 《Neural Regeneration Research》 SCIE CAS CSCD 2017年第3期464-469,共6页
Estrogen affects the generation and transmission of neuropathic pain,but the specific regulatory mechanism is still unclear.Activation of the N-methyl-D-aspartate acid receptor 1(NMDAR1) plays an important role in t... Estrogen affects the generation and transmission of neuropathic pain,but the specific regulatory mechanism is still unclear.Activation of the N-methyl-D-aspartate acid receptor 1(NMDAR1) plays an important role in the production and maintenance of hyperalgesia and allodynia.The present study was conducted to determine whether a relationship exists between estrogen and NMDAR1 in peripheral nerve pain.A chronic sciatic nerve constriction injury model of chronic neuropathic pain was established in rats.These rats were then subcutaneously injected with 17β-estradiol,the NMDAR1 antagonist D(-)-2-amino-5-phosphonopentanoic acid(AP-5),or both once daily for 15 days.Compared with injured drug na?ve rats,rats with chronic sciatic nerve injury that were administered estradiol showed a lower paw withdrawal mechanical threshold and a shorter paw withdrawal thermal latency,indicating increased sensitivity to mechanical and thermal pain.Estrogen administration was also associated with increased expression of NMDAR1 immunoreactivity(as assessed by immunohistochemistry) and protein(as determined by western blot assay) in spinal dorsal root ganglia.This 17β-estradiol-induced increase in NMDAR1 expression was blocked by co-administration with AP-5,whereas AP-5 alone did not affect NMDAR1 expression.These results suggest that 17β-estradiol administration significantly reduced mechanical and thermal pain thresholds in rats with chronic constriction of the sciatic nerve,and that the mechanism for this increased sensitivity may be related to the upregulation of NMDAR1 expression in dorsal root ganglia. 展开更多
关键词 nerve regeneration peripheral nerve injury ESTROGEn 17Β-ESTRADIOL n-rnethyl-D-aspartic acid receptor 1 pain sciatic nerve chronic constriction injury neuropathic pain D(-)-2-amino-5-phosphonopentanoic acid dorsal root ganglion spinal cord IMMUnOREACTIVITY western blot assay neural regeneration
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A Comparative Analysis of the New -3(-n) - 1 Remer Conjecture and a Proof of the 3n + 1 Collatz Conjecture
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作者 Mike Remer 《Journal of Applied Mathematics and Physics》 2023年第8期2216-2220,共5页
This scientific paper is a comparative analysis of two mathematical conjectures. The newly proposed -3(-n) - 1 Remer conjecture and how it is related to and a proof of the more well known 3n + 1 Collatz conjecture. An... This scientific paper is a comparative analysis of two mathematical conjectures. The newly proposed -3(-n) - 1 Remer conjecture and how it is related to and a proof of the more well known 3n + 1 Collatz conjecture. An overview of both conjectures and their respective iterative processes will be presented. Showcasing their unique properties and behavior to each other. Through a detailed comparison, we highlight the similarities and differences between these two conjectures and discuss their significance in the field of mathematics. And how they prove each other to be true. 展开更多
关键词 -3(-n) - 1 Remer Conjecture 3n + 1 Collatz Conjecture Comparative Analysis PROOF natural numbers Integer Sequences Factorial Processes Par-tial Differential Equations Bounded Values Collatz Conjecture Collatz Algo-rithm Collatz Operator Collatz Compliance And Mathematical Conjectures
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Extraction of lanthanide ions with N,N,N′,N′-tetrabutyl-3-oxadiglycolamide from nitric acid media 被引量:1
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作者 Xiu-Jing Peng Yu Cui +2 位作者 Ji-Fei Ma Yulan Li Guo-Xin Sun 《Nuclear Science and Techniques》 SCIE CAS CSCD 2017年第6期190-195,共6页
Extractability and extraction mechanism of lanthanide ions were investigated by using a new extractant,N,Nn,N′,N′-tetrabutyl-3-oxa-diglycolamide(TBDGA),in toluene from nitric acid media.The effects of HNO_3 and TBDG... Extractability and extraction mechanism of lanthanide ions were investigated by using a new extractant,N,Nn,N′,N′-tetrabutyl-3-oxa-diglycolamide(TBDGA),in toluene from nitric acid media.The effects of HNO_3 and TBDGA concentrations,and temperature,on extraction of lanthanide ions were studied.Stoichiometrics of the main extracted species were HNO_3·TBDGA and M(NO_3)_3-3TBDGA(M = Er,Dy,Tb,Gd,La,Ce,Nd,Sm and Eu).The extracted species for metal ions were established to be ionic complex.In this complex,nitrate anion was not coordinated to the central ion.The extraction pattern increased gradually across the lanthanide ions series,showing enhanced affinity of TBDGA toward heavy lanthanide ions.Thermodynamic parameters were investigated for the exothermic extraction reaction. 展开更多
关键词 LAnTHAnIDE ions EXTRACTIOn n n n n-tetrabutyl-3-oxa-diglycolamide nITRIC acid Toluene
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Relationship between high dietary fat intake and Parkinson’s disease risk: a meta-analysis 被引量:3
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作者 Yan Qu Xi Chen +1 位作者 Man-Man Xu Qiang Sun 《Neural Regeneration Research》 SCIE CAS CSCD 2019年第12期2156-2163,共8页
OBJECTIVE: To assess whether dietary fat intake influences Parkinson’s disease risk. DATA SOURCES: We systematically surveyed the Embase and PubMed databases, reviewing manuscripts published prior to October 2018. Th... OBJECTIVE: To assess whether dietary fat intake influences Parkinson’s disease risk. DATA SOURCES: We systematically surveyed the Embase and PubMed databases, reviewing manuscripts published prior to October 2018. The following terms were used:(“Paralysis agitans” OR “Parkinson disease” OR “Parkinson” OR “Parkinson’s” OR “Parkinson’s disease”) AND (“fat” OR “dietary fat” OR “dietary fat intake”). DATA SELECTION: Included studies were those with both dietary fat intake and Parkinson’s disease risk as exposure factors. The Newcastle-Ottawa Scale was adapted to investigate the quality of included studies. Stata V12.0 software was used for statistical analysis. OUTCOME MEASURES: The primary outcomes included the relationship between high total energy intake, high total fat intake, and Parkinson’s disease risk. The secondary outcomes included the relationship between different kinds of fatty acids and Parkinson’s disease risk. RESULTS: Nine articles met the inclusion criteria and were incorporated into this meta-analysis. Four studies scored 7 and the other five studies scored 9 on the Newcastle-Ottawa Scale, meaning that all studies were of high quality. Meta-analysis results showed that high total energy intake was associated with an increased risk of Parkinson’s disease (P = 0.000, odds ratio (OR)= 1.49, 95% confidence interval (CI): 1.26–1.75);in contrast, high total fat intake was not associated with Parkinson’s disease risk (P = 0.123, OR = 1.07, 95% CI: 0.91–1.25). Subgroup analysis revealed that polyunsaturated fatty acid intake (P = 0.010, OR = 1.03, 95% CI: 0.88–1.20) reduced the risk of Parkinson’s disease, while arachidonic acid (P = 0.026, OR = 1.15, 95% CI: 0.97–1.37) and cholesterol (P = 0.002, OR = 1.09, 95% CI: 0.92–1.29) both increased the risk of Parkinson’s disease. Subgroup analysis also demonstrated that, although the results were not significant, consumption of n-3 polyunsaturated fatty acids (P = 0.071, OR = 0.88, 95% CI: 0.73–1.05),α-linolenic acid (P = 0.06, OR = 0.86, 95% CI: 0.72–1.02), and the n-3 to n-6 ratio (P = 0.458, OR = 0.89, 95% CI: 0.75–1.06) were all linked with a trend toward reduced Parkinson’s disease risk. Monounsaturated fatty acid (P = 0.450, OR = 1.06, 95% CI: 0.91–1.23), n-6 polyunsaturated fatty acids (P = 0.100, OR = 1.15, 95% CI: 0.96–1.36) and linoleic acid (P = 0.053, OR = 1.11, 95% CI: 0.94–1.32) intakes were associated with a non-significant trend toward higher PD risk. Saturated fatty acid (P = 0.619, OR = 1.01, 95% CI: 0.87–1.18) intake was not associated with Parkinson’s disease. CONCLUSION: Dietary fat intake affects Parkinson’s disease risk, although this depends on the fatty acid subtype. Higher intake of polyunsaturated fatty acids may reduce the risk of Parkinson’s disease, while higher cholesterol and arachidonic acid intakes may elevate Parkinson’s disease risk. However, further studies and evidence are needed to validate any link between dietary fat intake and Parkinson’s disease. 展开更多
关键词 nerve REGEnERATIOn dietary fat Parkinson's disease risk META-AnALYSIS total energy InTAKE polyunsaturated FATTY ACIDS arachidonic ACID cholesterol α-linolenic ACID linoleic ACID n-3/n-6 polyunsaturated FATTY ACID InTAKE ratio monounsaturated FATTY ACIDS neural REGEnERATIOn
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Effects of long-term partial substitution of inorganic fertilizer with pig manure and/or straw on nitrogen fractions and microbiological properties in greenhouse vegetable soils
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作者 Shuo Yuan Ruonan Li +5 位作者 Yinjie Zhang Hao'an Luan Jiwei Tang Liying Wang Hongjie Ji Shaowen Huang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2024年第6期2083-2098,共16页
Partial substitution of inorganic fertilizers with organic amendments is an important agricultural management practice.An 11-year field experiment(22 cropping periods)was carried out to analyze the impacts of differen... Partial substitution of inorganic fertilizers with organic amendments is an important agricultural management practice.An 11-year field experiment(22 cropping periods)was carried out to analyze the impacts of different partial substitution treatments on crop yields and the transformation of nitrogen fractions in greenhouse vegetable soil.Four treatments with equal N,P_(2)O_(5),and K_(2)O inputs were selected,including complete inorganic fertilizer N(CN),50%inorganic fertilizer N plus 50%pig manure N(CPN),50%inorganic fertilizer N plus 25%pig manure N and 25%corn straw N(CPSN),and 50%inorganic fertilizer N plus 50%corn straw N(CSN).Organic substitution treatments tended to increase crop yields since the 6th cropping period compared to the CN treatment.From the 8th to the 22nd cropping periods,the highest yields were observed in the CPSN treatment where yields were 7.5-11.1%greater than in CN treatment.After 11-year fertilization,compared to CN,organic substitution treatments significantly increased the concentrations of NO_(3)^(-)-N,NH_(4)^(+)-N,acid hydrolysis ammonium-N(AHAN),amino acid-N(AAN),amino sugar-N(ASN),and acid hydrolysis unknown-N(AHUN)in soil by 45.0-69.4,32.8-58.1,49.3-66.6,62.0-69.5,34.5-100.3,and 109.2-172.9%,respectively.Redundancy analysis indicated that soil C/N and OC concentration significantly affected the distribution of N fractions.The highest concentrations of NO_(3)^(-)-N,AHAN,AAN,AHUN were found in the CPSN treatment.Organic substitution treatments increased the activities ofβ-glucosidase,β-cellobiosidase,N-acetyl-glucosamidase,L-aminopeptidase,and phosphatase in the soil.Organic substitution treatments reduced vector length and increased vector angle,indicating alleviation of constraints of C and N on soil microorganisms.Organic substitution treatments increased the total concentrations of phospholipid fatty acids(PLFAs)in the soil by 109.9-205.3%,and increased the relative abundance of G^(+)bacteria and fungi taxa,but decreased the relative abundance of G-bacteria,total bacteria,and actinomycetes.Overall,long-term organic substitution management increased soil OC concentration,C/N,and the microbial population,the latter in turn positively influenced soil enzyme activity.Enhanced microorganism numbers and enzyme activity enhanced soil N sequestration by transforming inorganic N to acid hydrolysis-N(AHN),and enhanced soil N supply capacity by activating non-acid hydrolysis-N(NAHN)to AHN,thus improving vegetable yield.Application of inorganic fertilizer,manure,and straw was a more effective fertilization model for achieving sustainable greenhouse vegetable production than application of inorganic fertilizer alone. 展开更多
关键词 organic substitution management greenhouse vegetable production n fractions microbial community composition extracellular enzyme activity enzyme stoichiometry coefficients
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