检索结果-南通市图书馆

Shoot Apex Demand Determines Assimilate and Nutrients Partitioning and Nutrient-uptake Rate in Tobacco Plants

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2007年第11期49卷 1654-1661页

作者： Huai-Yu Yang Chun-jian li fu-Suo Zhang The Key Laboratory of Plant Nutrition Ministry of Agriculture Key Laboratory of Plant-Soil Interactions Ministry of Education Department of Plant Nutrition China Agricultural University Beijing 100094 China

Our previous experiment revealed that apex-removed plants have larger root systems but a lower K＋-uptake rates than intact tobacco plants. Since the apex is not only a center of growth and metabolism, but also an important place of auxin synthesis and export, the aims of this study were to distinguish whether the apex demand or auxin synthesized in the apex regulates assimilate and nutrients partitioning within plant, and to explain the reason for the lower K＋-uptake rate of the apex-removed plant. In comparison with the control plant, covering the shoot apex with a black transparent plastic bag reduced net increases in dry matter and nutrients; however, the distribution of the dry matter and nutrients between shoot and roots and nutrient-uptake rates were not changed. Removal of the shoot apex shifted the dry mass and nutrients distributions to roots, and reduced the rate of nutrient uptake. Application of 1-naphthylacetic acid （NAA） could partly replace the role of the removed apex, stimulated assimilate and nutrient deposition into the treated tissue, and enhanced the reduced plasma membrane ATPase activity of roots to the control level. However, treatment of the apex-removed plants with NAA could not rescue the reduced nutrient uptake rate and the shifted assimilates and nutrients partitioning caused by excision of the apex. Higher nutrient uptake rate of the intact plants could not be explained by root growth parameters, such as total root surface area and number of root tips. The results from the present study indicate that strong apex demand determined assimilates and nutrients partitioning and nutrient-uptake rate in tobacco （Nicotiana tabacum） plants.

关键词： assimilate and nutrient partitioning auxin nutrient uptake removal of the shoot apex shoot apex demand tobacco (Nicotiana tabacum).

Application of Self-Learning to Heating Process Control of Simulated Continuous Annealing

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2010年第6期17卷 27-31页

作者： WANG Wen-le li jian-ping HUA fu-an liUXiang-hua State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110004 Liaoning China

On the basis of a simulated bright continuous annealing experimental machine, a process control model for heating system was built. The heating model was simplified and self-learning parameters were normalized to enhance the precision of temperature control. By means of the division of temperature layers and the exponential smoothing disposal of the annealing experimental data, the self-learning of the heating model was carried out. Through exponentially smoothing the deviation of self-learning parameters of the heated phase in heating process, dynamic modifications of self-learning parameters and heating electric current were carried out, and the precision of temperature control was confirmed. The application indicated that the process control model for the heating system can control temperature with high precision, and the deviation can be controlled within 8 ℃.

关键词： annealing simulation annealing maehine process control self-learning

Luminescence Properties and Crystal Growth of Er/Yb Codoped KGd(WO_4)_2

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2005年第8期24卷 879-884页

作者： WANG Yan TU Chao-Yang ZHU Zhao-Jie li jian-fu YOU Zhen-Yu WU Bai-Chang State Key Laboratory of Structural Chemistry fujian Institute of Research on theStructure of Matter The Chinese Academy of Sciences ChinaFuzhou Fujian 350002

In this paper, the spectral and luminescence properties of a series of KGd（WO4）2 powder samples codoped with different concentrations of Er^3＋ and Yb^3＋ were reported,and the best doping concentrations were found to be lat% Er^3＋ and 10at% Yb^3＋ for attaining the strongest intensity. The Er^3＋/yb^3＋ codoped KGd（WO4）2 crystal with good optical quality was grown by the TSSG method and the growth conditions were presented. The unpolarized absorption and emission spectra of the crystal have been measured. The strong absorption peak is at 980 nm with a FWHM of 65 nm, and the emission peak is at 1536 nm when pumped by 976 rim. The fluorescence lifetime of manifold ^4I13/2 is estimated to be 4.5 ms at room *** of Er, Yb：KGW crystal have shown it to have necessary combination of properties to get an effective generation of - 1.54 μm eye-safe radiation with laser diode pumping.

关键词： Er Yb:KGW crystal luminescence properties,crystal growth optical properties

Enhancement of Two-photon Absorption by Ce^(3+) Sensitization in Organic Dyes

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2007年第5期23卷 571-573页

作者： li jian-fu SUN Cheng-lin ZHOU Hai-ling XU li-hua YANG Qing-xin jianG Zhan-kui Department of Physics Linyi Normal University Linyi 276005 P. R. China College of Physics Jilin University Changchun 130021 P. R. China Department of Physics Yantai University Yantai 246005 P. R. China

The two-photon absorption（TPA）and TPA-induced frequency upconversion emission properties of the dyes 4-[P-（dicyanoethylamino）crystal]-N-methypyrdinium iodide and the complex of 4-[P-（dicyanoethylamino）crystal]-N-methypyrdinium iodide and Ce（NO3）3 were experimentally *** was found that the TPA cross section for the dye sensitized by Ce3＋ is two factors larger than that of the dye without being sensitized.A three-level system model of the dye molecules was used to analyze the enhancement of TPA by the sensitizer Ce3＋,which indicated that the sensitizer results in the increase of the transition dipole moment from the one-photon allowed excited state（1Bu）to the two-photon allowed excited state（2Ag）.

关键词： Two-photon absorption Frequency upconversion Organic dye

Pheochromocytoma in a 49-year-old woman presenting with acute myocardial infarction:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第15期9卷 3752-3757页

作者： Hao-Yu Wu Yi-Wei Cao Tian-Jiao Gao jian-li fu Lei liang Department of Cardiology Shaanxi Provincial People’s HospitalXi'an 710068Shaanxi ProvinceChina Department of Electrocardiology Shaanxi Provincial People’s HospitalXi'an 710068Shaanxi ProvinceChina Department of Gastroenterology Xi’an Children’s HospitalXi'an 710068Shaanxi ProvinceChina Ultrasonic Diagnosis Center Shaanxi Provincial People’s HospitalXi’an 710068Shaanxi ProvinceChina

BACKGROUND Pheochromocytoma is a rare endocrine tumor arising from chromaffin cells and having extensive and profound effects on the cardiovascular system by continuously or intermittently releasing *** clinical manifestations of pheochromocytoma are diverse,and the typical triad,including episodic headache,palpitations,and sweating,only occurs in 24%of pheochromocytoma patients,which often misleads clinicians into making an incorrect *** herein report the case of a patient with intermittent chest pain and elevated myocardial enzymes for 2 years who was diagnosed with *** SUMMARY A 49-year-old woman presented with intermittent chest pain for 2 *** years ago,the patient experienced chest pain and was diagnosed with acute myocardial infarction,with 25%stenosis in the left *** patient still had intermittent chest pain after *** hours before admission to our hospital,the patient experienced chest pain with nausea and vomiting,lasting for 20 *** I and urinary norepinephrine and catecholamine levels were *** electrocardiogram indicated QT prolongation and ST-segment depression in leads II,III,aVF,and V3-V6.A coronary computed tomography angiogram revealed no evidence of coronary artery *** showed left ventricular enlargement and a decreased posterior inferior wall motion ***-enhanced computed tomography demonstrated an inhomogeneous right adrenal *** patient successfully underwent laparoscopic right adrenalectomy,and histopathology confirmed adrenal *** the first-year follow-up visits,the patient was *** abnormal changes on echocardiography and electro-cardiogram *** Clinicians should be aware of pheochromocytoma.A timely and accurate diagnosis of pheochromocytoma is essential for alleviating serious cardiac complications.

关键词： Pheochromocytoma Catecholamine Cardiac complications Acute myocardial infarction Chest pain Case report

Arrhythmogenic right ventricular cardiomyopathy characterized by recurrent syncope during exercise:A case report

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

World Journal of Clinical Cases 2021年第16期9卷 4095-4103页

作者： Hao-Yu Wu Yi-Wei Cao Tian-Jiao Gao jian-li fu Lei liang Department of Cardiology Shaanxi Provincial People’s HospitalXi'an 710068Shaanxi ProvinceChina Department of Electrocardiology Shaanxi Provincial People’s HospitalXi'an 710068Shaanxi ProvinceChina Department of Gastroenterology Xi’an Children’s HospitalXi’an 710003Shaanxi ProvinceChina Department of Ultrasonic Diagnosis Center Shaanxi Provincial People’s HospitalXi’an 710068Shaanxi ProvinceChina

BACKGROUND Arrhythmogenic right ventricular(RV)cardiomyopathy is a rare and currently underrecognized cardiomyopathy characterized by the replacement of RV myocardium by fibrofatty *** may be asymptomatic or symptomatic(palpitations or syncope)and may induce sudden cardiac death,especially during *** prevent adverse events such as sudden cardiac death and heart failure,early diagnosis and treatment of arrhythmogenic RV cardiomyopathy(ARVC)are *** report a patient with ARVC characterized by recurrent syncope during exercise who was successfully treated with combined endocardial and epicardial catheter *** SUMMARY A 43-year-old man was referred for an episode of syncope during ***,the patient experienced two episodes of syncope without a firm etiological *** electrocardiogram obtained at admission indicated ventricular tachycardia originating from the inferior wall of the right *** ventricular tachycardia was terminated with intravenous propafenone.A repeat electrocardiogram showed a regular sinus rhythm with negative T waves and a delayed S-wave upstroke from leads V1 to *** magnetic resonance imaging showed RV free wall thinning,regional RV akinesia,RV dilatation and fibrofatty infiltration(RV ejection fraction of 38%).An electrophysiological study showed multiple inducible ventricular tachycardia as of a focal mechanism from the right *** and epicardial voltage mapping demonstrated scar tissue in the anterior wall,free wall and posterior wall of the right *** potentials were also *** patient was diagnosed with ARVC and treated with combined endocardial and epicardial catheter ablation with a very satisfactory follow-up *** Clinicians should be aware of ARVC,and further workup,including imaging with multiple modalities,should be *** combination of epicardial and endocardial catheter ablation can lead to a good outcome.

关键词： Arrhythmogenic right ventricular cardiomyopathy Endocardial catheter ablation Epicardial catheter ablation Syncope Exercise Case report

Quantum public-key crypto via EPR pairs

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

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 58-63页

作者： Xiang-Qun fu Hong-Wei li jian-Hong Shi Tan li Wan-Su Bao Henan Key Laboratory of Quantum Information and Cryptography Information Engineering University Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China

With the development of quantum computing technology, quantum public-key cryptography is gradually becoming an alternative to the existing classical public-key cryptography. This paper designs a quantum trapdoor one-way function via EPR pairs and quantum measurements. Based on this, a new quantum public-key cryptosystem is presented, which offers forward security,and can resist the chosen-plaintext attack and chosen-ciphertext attack. Compared with the existing quantum public-key cryptos,eavesdropping can be automatically detected in this new quantum public-key cryptosystem under a necessary condition, which is also detailed in the paper.

关键词： quantum public-key crypto trapdoor one-way function EPR pairs

Tiller fertility is critical for improving grain yield,photosynthesis,and nitrogen efficiency in wheat

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2023年第7期22卷 2054-2066页

作者： DING Yong-gang ZHANG Xin-bo MA Quan li fu-jian TAO Rong-rong ZHU Min li Chun-yan ZHU Xin-kai GUO Wen-shan DING Jin-feng jiangsu Key Laboratory of Crop Genetics and Physiology/jiangsu Key Laboratory of Crop Cultivation and Physiology/Agricultural College Yangzhou UniversityYangzhou 225009P.R.China jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops Yangzhou UniversityYangzhou 225009P.R.China jiangsu Ruihua Agricultural Technology Co. Ltd.Suqian 223800P.R.China

Genetic improvement has promoted wheat’s grain yield and nitrogen use efficiency(NUE)during the past ***,the current wheat cultivars exhibit higher grain yield and NUE than previous cultivars in the Yangtze River Basin,China since the ***,the critical traits and mechanisms of the increased grain yield and NUE remain *** study explores the mechanisms underlying these new cultivars’increased grain yield and NUE by studying 21 local cultivars cultivated for three growing seasons from 2016 to *** positive correlations were observed between grain yield and NUE in the three *** cultivars were grouped into high(HH),medium(MM),and low(LL)grain yield and NUE *** HH group exhibited significantly high grain yield and *** grain yield was attributed to more effective ears by high tiller fertility and greater single-spike yield by increasing post-anthesis single-stem *** to other groups,the HH group demonstrated a longer leaf stay-green ability and a greater flag leaf photosynthetic rate after *** also showed higher N accumulation at pre-anthesis,which contributed to increasing N accumulation per stem,including stem and leaf sheath,leaf blade,and unit leaf area at pre-anthesis,and promoting N uptake efficiency,the main contribution of high ***,tiller fertility was positively related to N accumulation per stem,N accumulation per unit leaf area,leaf stay-green ability,and flag leaf photosynthetic rate,which indicates that improving tiller fertility promoted N uptake,leaf N accumulation,and photosynthetic ability,thereby achieving synchronous improvements in grain yield and ***,tiller fertility is proposed as an important kernel indicator that can be used in the breeding and management of cultivars to improve agricultural efficiency and sustainability.

关键词： grain yield NUE tiller fertility photosynthesis nitrogen uptake

Cardioprotective effects of diltiazem reevaluated by a novel myocardial ischemic model in Chinese miniature swine

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2007年第1期28卷 52-57页

作者： jian-xun liU~2 Zhen YU Xin-zhi li jian-hua fu Xiao-hong SHANG Ai-guo YAN Yue SHI Yan-lei MA Department of Pharmacology,Xiyuan Hospital,China Academy of Chinese Medical Sciences,Beijing 100091,China Department of Pharmacology Xiyuan Hospital China Academy of Chinese Medical Sciences Beijing China

Aim:To develop a new model of myocardial ischemia in Chinese miniature swineand reevaluate the cardioprotective effects of ***:Myocardialischemia was induced by injecting self-embolus into the left anterior descending(LAD)coronary artery in qualified miniature ***(5 ***-1.d-1)wasorally administered to the swine by mixing into normal pig diet from 1 to 6 d afterself-embolus *** coronary angiography,30 point body surface electro-cardiogram(BS-ECG),hemodynamics,biochemistry,quantitative histology andpathohistology were determined 6 d after self-embolus ***:Embo-lization occurred in the LAD coronary artery of the Chinese miniature swine in-jected by *** were significant myocardial ischemia and largecardiac muscle infarction in the Chinese miniature swine,which were accompa-nied with increased BS-ECG,decreased hemodynamic indexes of the cardiac output,cardiac index,left cardiac work and left cardiac work index,and increased systemicvascular resistance *** analysis revealed myocardial degen-eration,necrosis,fibrosis,inflammatory cell infiltration and granulation tissuehyperblastosis(n=6).Diltiazem diminished the extent of the LAD embolism,ame-liorated myocardial ischemia,improved the hemodynamic indexes,increased theplasma superoxide dismutase activity,decreased the plasma malondialdehydecontent,narrowed the myocardial ischemic area and weakened the pathohistologicaldamage in the cardiac muscle(n=6).Conclusion:Myocardial ischemia induced byinjecting self-embolus into the LAD coronary artery in Chinese miniature swine isquite close to clinical pathophysiological *** is effective toinhibit the myocardial ischemia and restore the heart function in this novel model.

关键词： myocardial ischemia diltiazem animal models Chinese miniature swine