mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
液-质联用测定血浆中西咪替丁的含量

目的: 建立LC-APCI-MS法测定血浆中西咪替丁的血药浓度. 方法: 采用Zorbax SB-C_(18) (2.1 mm×100 mm, 3.5 μm)色谱柱; 流动相为甲醇-0.1%甲酸(60:40). 大气压化学电离源(APCI), 选择正离子模式检测, 采用选择离子监测(SIM)方式进行定量分析, 检测离子为m/z 253(西咪替丁),m/z 180(内标非那西丁). 结果: 血浆中西咪替丁在10 ~200μ·gL~(-1)范围内线性关系良好, 最低检测限为 10 μg·L~(-1),西咪替丁的平均萃取回收率为74.2%~75.1%, 日内及日间RSD都低于13%. 结论: 该方法操作简便、灵敏度高, 可用于西咪替丁的临床血药浓度监测
HPLC测定雌二醇凝胶中雌二醇的含量

雌二醇凝胶是当代雌激素替补治疗(HRT)中,应用较为广泛的一种透皮吸收给药方式。其主要成分为雌二醇,临床适用于绝经后妇女雌激素缺乏而引起的一系列疾病[1]。为了控制制剂的质量,保证药物的安全、有效、质量可控,本实验参考了国内外相关资料[2-3],建立了HPLC测定雌二醇含量的方法。与已有方法比较,此法操作简便,快速准确,可作为透皮控释制剂的质量控制方法。实验所测雌二醇凝胶已获得批准,属于新药(国药准字H20051153),规格为:40 g:24 mg
毛细管电泳研究最新亮点

多聚磷酸盐是一种由几个至数百个磷酸残基相互聚合形成的线性多聚体,广泛存在于自然界的无机环境和细菌,真菌等低等单细胞生物和高等哺乳动物等生命有机体中.多聚磷酸盐分析是探寻地球生命的化学和生物起源的基本研究内容.传统的多聚磷酸盐分析主要采用凝胶电泳和凝胶染色检测,方法烦琐,耗时长.采用阴离子交换色谱结合电导检测,对磷酸盐聚合度应用范围较窄.多聚磷酸盐的毛细管电泳分析主要采用涂层毛细管和管内填充线性聚丙烯酰胺筛分介质的方法,其在毛细管的重复使用,方法的重现性以及高聚合度多聚磷酸盐的分析中存在不足.Whitesides等用低黏度的聚N,N-二甲基丙烯酰胺(PDMA)作为毛细管凝胶电泳介质,以对苯二甲酸盐为背景吸收电解质,通过优化背景电解质的pH等手段实现了聚合度可达70的聚磷酸盐的高分辨分离和间接灵敏检测.通过在出口端样品瓶中加入聚乙二醇(PEG)与毛细管内溶液密度平衡,使分离电流稳定,重现性提高.该方法简单,方便,并可拓展用于其他无生色团的生物高分子多聚阴离子混合物(如硫酸多糖,低聚磷酸盐二酯,磷壁酸,透明质酸,磷酸软骨素等)的高分辨分析检测.详见:Anal Chem,2010,82:6838~6846
氰化物生产企业突发性中毒事故应急救援体系构建

氰化物生产企业突发中毒事故时有发生,除自然因素 (地震、水灾、泥石流、火灾、风灾、雷电等)之外,人为因素导致的事故呈日显增多的趋势(恐怖者破坏、战争、交通事故、建筑物坍塌、违反操作规程等). 国外最为著名的氰化物中毒事故是发生在印度(1984年)博帕尔农药厂的异氰酸甲酯45吨泄露事故,致20余万人中毒, 2500人死亡,其对环境的污染至今未除[1]. 据不完全统计,近年来,我国发生急性氰化物大小中毒事件共9起,致使71人急性中毒, 8人(11. 3%)死亡,在其中的一次较大的事故中,氰化物致人员中毒达40人,死亡2人[2]. 氰化物生产企业突发事故难以预料,常伴有爆炸、燃烧等情况,事故现场人员除因氰化物急性中毒可能迅速致死之外,还可能合并爆炸伤、化学灼伤,致使中毒病员的病情更加复杂、危重,给医务人员的诊治工作带来许多麻烦和难度. 另外,事故现场释放出的气态或液态毒物可借风势、水流扩散,致周围大气或江河污染,而累及周边单位、居民区、学校甚至邻国,造成人民生命财产更大损失. 故此,制定既有效又实用的突发性氰化物中毒事故的预防和应急救援体系,显得尤为重要
轨道减振器的减振效果分析

火车轨道减振器已有多种类型,多数选用橡胶减振器(见图1),原因是价格便宜,能大量生产.它的变形是压缩和剪切的组合.将这种减振器安装在钢轨与枕木之间,这时车辆减振系统属于多自由度,线性系统受随机激励的受迫振动
不同施肥处理对大豆生理性状及产量的影响

通过采用盆栽法,研究了7种不同施肥处理对大豆苗期、花期、荚期、鼓粒期叶绿素含量、根瘤重、根干重、干物重和产量性状及产量的影响. 结果表明,70%化肥+生物肥+花期和鼓粒期分两次喷施叶面肥,此处理能明显改善大豆各项生理性状,不同施肥处理均能提高大豆产量,以90%化肥和有机肥进行配合施用获得最高产量
频振式诱蛾杀虫灯在水稻上的应用效果探析

通过对佳多频振式诱蛾杀虫灯在水稻上的应用效果进行试验示范,结果表明:杀虫灯能诱杀稻纵卷叶螟、稻飞虱、粘虫、二化螟、稻叶蝉、稻蝽类和金龟子等水稻上主要害虫,其中稻飞虱、稻纵卷叶螟分别占诱杀主要害虫数量的66.19%和30.88%;平均每天每盏灯诱杀水稻主要害虫61.96头. 灯控区较非灯控区加权平均施药次数减少1.87次,减少成本投入457.24元/hm~2. 加权平均产量为8 715.75 kg/hm~2,较非灯控区平均单产7 918.05 kg/hm~2缩值后增加638.16 kg/hm~2,增产10.08%. 灯控区危害程度明显减轻,高峰期危害时间相对缩短,损失降低
加快葡萄产业化进程,打造南方"吐鲁番"----专访湖南农业大学石雪晖教授

一亩葡萄收益过万?种植葡萄能有上亿的年收益?是的,这些都不是神话,而创造这一奇迹的就是全国先进工作者、湖南农业大学教授石雪晖. 她在常德澧县推广葡萄种植技术,每亩红提收入达10500~15750元,种植面积发展到2.4万亩,年收益上亿元,使澧县的葡萄产业获得大发展. 本月,<<湖南农业科学>>记者就葡萄在湖南的种植效益及产业推广等问题专访了石教授
肺淋巴上皮样癌一例报告

肺淋巴上皮样癌(lymphoepitheloid carcinoma.LELC)是一种罕见的肿瘤,Begin等[1]于1987年首先报道.根据WHO的2004年肺癌组织学类型分类,该病被归入肺大细胞癌的变异型.目前世界报道的病例多见于我国华南省份以及台湾和香港地区,提示该病具有显著的地理分布特点
多种抗生素致急性过敏性间质性肾炎1例报告

1临床资料患者女性,53岁,因"乏力、恶心、呕吐2周"入院. 2009年10月由于"上呼吸道感染"在当地卫生所注射青霉素4d、红霉素2d、头孢菌素3d后,检查发现"血尿、蛋白尿、肾功能异常",每日尿量约600ml,随后入我院肾内科治疗. 否认既往有自身免疫性疾病、恶性肿瘤、代谢性疾病史;患者平素食欲欠佳、厌食. 体检:面色苍白,血压110/70mmHg(1mmHg=0.133kPa),全身皮肤无皮疹. 实验室检查:血常规白细胞计数10.3×109/L,血红蛋白105g/L,血细胞比容0.316,中性粒细胞0.74. 尿检蛋白,24h尿蛋白定量1700mg,WBC32个/HPF,尿本-周蛋白(+);尿白细胞分类: 中性分叶核粒细胞0. 46, 淋巴细胞0.26,单核细胞0. 16, 嗜酸分叶核粒细胞0.12. 肾功能: 血β2-MG 4.896mg/L, 尿β2-MG>10 mg/L, 尿al-MG>33 mg/L. 总蛋白75 g/L, 白蛋白38 g/L, C反应蛋白24.7 mg/L, 各项免疫指标及肝病4项均正常. 双肾B超示: 左肾109 mm×49 mm;右肾100 mm×41 mm. 骨髓检查: 粒系细胞增多, 嗜酸粒细胞可见, 红系细胞增多, 以晚幼红细胞为主, 排除多发性骨髓瘤. 胃镜检查: 胃窦炎伴有幽门痉挛. 肾功能进行性恶化, 血肌酐最高达795 μmol/L. 肾组织病理: 免疫荧光检查均阴性; 光镜示肾间质水肿, 可见大量淋巴细胞、单核细胞、嗜酸粒细胞浸润, 肾小管颗粒上皮变性、空泡变性, 部分上皮脱落, 肾小球病变不明显(图1). 临床诊断: 急性肾衰竭; 病理诊断: 急性过敏性间质性肾炎. 入院1周后, 给予甲泼尼龙40 mg/d静滴, 3周后肾功能逐渐恢复至血肌酐151.4 μmol/L, 出院后口服甲泼尼龙8周(1 mg/kg), 之后减量口服(每2周减5 mg). 随访期间复查肾功能正常
干细胞研究进展消息

干细胞是人体及其各种组织细胞的最初来源, 具有高度自我复制、高度增殖和多向分化的潜能. 干细胞研究正在向现代生命科学和医学的各个领域交叉渗透, 干细胞技术也从一种实验室概念逐渐转变成能够看得见的现实. 干细胞研究已成为生命科学中的热点. 介于此, 本刊将就干细胞的最新研究进展情况设立专栏, 为广大读者提供了解干细胞研究的平台
A novel high voltage start up circuit for an integrated switched mode power supply

A novel high voltage start up circuit for providing an initial bias voltage to an' integrated switched mode power supply (SMPS) is presented. An enhanced mode VDMOS transistor, the gate of which is biased by a floating pisland, is used to provide start up current and sustain high voltage. An NMOS transistor having a high source to ground breakdown voltage is included to extend the bias voltage range to the SMPS. Simulation results indicate that the high voltage start up circuit can start and restart as designed. The proposed structure is believed to be more energy saving and cost-effective compared with other solutions
1.DCM, FSM, dead time and width controllers for a high frequency high efficiency buck DC-DC converter over a wide load range

This paper presents a width controller, a dead time controller, a discontinuous current mode (DCM) controller and a frequency skipping modulation (FSM) controller for a high frequency high efficiency buck DC-DC converter. To improve the efficiency over a wide load range, especially at high switching frequency, the dead time controller and width controller are applied to enhance the high load efficiency, while the DCM controller and FSM controller are proposed to increase the light load efficiency. The proposed DC-DC converter controllers have been designed and fabricated in the Chartered 0.35 μm CMOS process, and the measured results show that the efficiency of the buck DC-DC converter is above 80% over a wide load current range from 8 to 570 mA, and the peak efficiency is 86% at 10 MHz switching frequency
A Ga-doped ZnO transparent conduct layer for GaN-based LEDs

An 8 μm thick Ga-doped ZnO (GZO) film grown by metal-source vapor phase epitaxy was deposited on a GaN-based light-emitting diode (LED) to substitute for the conventional ITO as a transparent conduct layer (TCL). Electroluminescence spectra exhibited that the intensity value of LED emission with a GZO TCL is markedly improved by 23.6% as compared to an LED with an ITO TCL at 20 mA. In addition, the forward voltage of the LED with a GZO TCL at 20 mA is higher than that of the conventional LED. To investigate the reason for the increase of the forward voltage, X-ray photoelectron spectroscopy was performed to analyze the interface properties of the GZO/p-GaN heterojunction. The large valence band offset (2.24 ± 0.21 eV) resulting from the formation of Ga_20_3 in the GZO/p-GaN interface was attributed to the increase of the forward voltage
Chlorine gas sensors using hybrid organic semiconductors of PANI/ZnPcCl_(16)

PANI/ZnPcCl_(16) (polyaniline doped with sulfosalicylic acid/hexadecachloro zinc phthalocyanine) powders were vacuum co-deposited onto Si substrates, where Pt interdigitated electrodes were made by micromachining. The PANI/ZnPcCl_(16) films were characterized and analyzed by SEM, and the influencing factors on its intrinsic performance were analyzed and sensitivities of the sensors were investigated by exposure to chlorine (Cl_2) gas. The results showed that powders prepared with a stoichiometric ratio of (ZnPcCl_(16))_(0.6)(PANI)_(0.4) had a preferential sensitivity to Cl_2 gas, superior to those prepared otherwise; the optimal vacuum co-deposition conditions for the films are a substrate temperature of 160 ℃, an evaporation temperature of 425 ℃ and a film thickness of 75 nm; elevating the operation temperature (above 100 ℃) or increasing the gas concentration (over 100 ppm) would improve the response characteristics, but there should be upper levels for each. Finally, the gas sensing mechanism of PANI/ZnPcCl_(16) films was also discussed
A low jitter, low spur multiphase phase-locked loop for an IR-UWB receiver

A low jitter, low spur multiphase phase-locked loop (PLL) for an impulse radio ultra-wideband (IR-UWB) receiver is presented. The PLL is based on a ring oscillator in order to simultaneously meet the jitter requirement, low power consumption and multiphase clock output. In this design, a noise and matching improved voltage-controlled oscillator (VCO) is devised to enhance the timing accuracy and phase noise performance of multiphase clocks. By good matching achieved in the charge pump and careful choice of the loop filter bandwidth, the reference spur is suppressed. A phase noise of-118.42 dBc/Hz at a frequency offset of 1 MHz, RMS jitter of 1.53 ps and reference spur of -66.81 dBc are achieved at a carrier frequency of 264 MHz in measurement. The chip was manufactured in 0.13 μm CMOS technology and consumes 4.23 mW from a 1.2 V supply while occupying 0.14 mm~2 area
Young's modulus characterization of low-k films of nanoporous Black Diamond' by surface acoustic waves

The laser-generated surface acoustic wave (SAW) technique is an accurate, fast and nondestructive solution to determine the mechanical properties of ultra thin films. SAWs are dispersive during the wave propagation on the layered structure. The Young's moduli of thin films can be obtained by matching the experimentally and theoretically calculated dispersive SAW curves. A short ultraviolet laser pulse is employed to generate the broad spectral range of the dispersive SAWs. The frequency range of dispersive SAWs in this study reaches 180 MHz, which is adequate for the SAW technique applied for the investigated samples. In this work, the Young's moduli of a series of nanoporous Black Diamond TM low dielectric constant (low-k) films deposited on a Si (100) substrate are characterized successfully by the SAW technique
A fully integrated UHF RFID reader SoC for handheld applications in the 0.18 μm CMOS process

A low cost fully integrated single-chip UHF radio frequency identification (RFID) reader SoC for short distance handheld applications is presented. The SoC integrates all building blocks-including an RF transceiver, a PLL frequency synthesizer, a digital baseband and an MCU-in a 0.18 μm CMOS process. A high-linearity RX frontend is designed to handle the large self-interferer. A class-E power amplifier with high power efficiency is also integrated to fulfill the function of a UHF passive RFID reader. The measured maximum output power of the transmitter is 20.28 dBm and the measured receiver sensitivity is -60 dBm. The digital baseband including MCU core consumes 3.91 mW with a clock of 10 MHz and the analog part including power amplifier consumes 368.4 mW. The chip has a die area of 5.1 x 3.8 mm~2 including pads
Now and future of mouse mutagenesis for human disease models

One of the major objectives of the Human Genome Project is to understand the biological function of the gene and genome as well as to develop clinical applications for human diseases. For this purpose, the experimental validations and preclinical trails by using animal models are indispensable. The mouse (Mus musculus) is one of the best animal models because genetics is well established in the mouse and embryonic manipulation technologies are also well developed. Large-scale mouse mutagenesis projects have been conducted to develop various mouse models since 1997. Originally, the phenotype-driven mutagenesis with N-ethyl-N-nitrosourea (ENU) has been the major efforts internationally then knockout/conditional mouse projects and gene-driven mutagenesis have been following. At the beginning, simple monogenic traits in the experimental condition have been elucidated. Then, more complex traits with variety of environmental interactions and gene-to-gene interactions (epistasis) have been challenged with mutant mice. In addition, chromosomal substitution strains and collaborative cross strains are also available to elucidate the complex traits in the mouse. Altogether, mouse models with mutagenesis and various laboratory strains will accelerate the studies of functional genomics in the mouse as well as in human
Developing new SSR markers from ESTs of pea (Pisum sativum L.)

The development of expressed sequence tags (ESTs) from p a has provided a useful source for mining novel simple sequence repeat (SSR) markers. In the present research, ir order to find EST-derived SSR markers, 18552 pea ESTs from the National Center for Biotechnology Information (NCBI) database were downloaded and assembled into 10086 unigenes. A total of 586 microsatellites in 530 unigenes were identified, indicating that merely 5.25% of sequences contained SSRs. The most abundant SSRs within pea were tri-nucleotide repeat motifs, and among all the tri-nucleotide repeats, the motif GAA was the most abundant type. In total, 49 SSRs were used for primer design. EST-SSR loci were subsequently screened on 10 widely adapted varieties in China. Of these, nine loci showed polymorphic profiles that revealed two to three alleles per locus. The polymorphism information content value ranged from 0.18 to 0.58 with an average of 0.41. Furthermore, transferable analysis revealed that some of these loci showed transferability to faba bean. Because of their polymorphism and transferability, these nine novel EST-SSRs will be valuable tools for marker-assisted breeding and comparative mapping of pea in the future
The role of K-opioid receptor activation in mediating antinociception and addiction

The K-opioid receptor (KOR), a member of the opioid receptor family, is widely expressed in the central nervous system and peripheral tissues. Substantial evidence has shown that activation of KOR by agonists and endogenous opioid peptides in vivo may produce a stronganalgesic effect that is free from the abuse potential and the adverse side effects of μ-opioid receptor (MOR) agonists, such as morphine. In addition, activation of the KOR has also been shown to exert an inverse effect on morphine-induced adverse actions, such as tolerance, reward, and impairment of learning and memory. Therefore, the KOR has received much attention in the effort to develop alternative analgesics to MOR agonists and agents for the treatment of drug addiction. However, KOR agonists also produce several severe undesirable side effects such as dysphoria, water diuresis, salivation, emesis, and sedation in nonhuman primates, which may limit the clinical utility of KOR agonists for pain and drug abuse treatment. This article will review the role of KOR activation in mediating antinociception and addiction. The possible therapeutic application of K-agonists in the treatment of pain and drug addiction is also discussed
银杏达莫联合赛百纤溶酶治疗早期脑梗塞的临床分析

目的观察银杏达莫联合赛百纤溶酶对早期脑梗塞的临床治疗效果.方法随机将67例急性脑梗塞患者分为对照组和联合治疗组, 对照组33例, 给予纤溶酶治疗, 联合治疗组34例, 给予银杏达莫联合赛百纤溶酶治疗, 二组疗程均在治疗一个月后评定疗效.结果联合治疗组总有效率明显高于对照组(P<0.05), 且其神经功能缺损程度评分、血脂水平较对照组明显降低(P<0.05), 高密度脂蛋白胆固醇(HDL-C)则明显升高(P<0.05).结论银杏达莫联合赛百纤溶酶联合应用治疗早期脑梗塞效果显著, 能有效改善神经功能, 有效降低患者血脂水平
膝骨性关节炎经筋辨证的步态分析研究

目的探讨膝骨性关节炎患者不同经筋证型的步态特征.方法选取不同经筋证型的19例膝骨性关节炎(KOA)患者共30个患膝, 运用足底压力测量系统测试步角、足跟部冲量、旋内旋外值及地面最大垂直反力出现时间占支撑期总时间的百分比.结果在步角和足跟部冲量上, 少阳经筋病变膝和三阴经筋病变膝均大于正常(P<0.05), 足阳明经筋病变膝正常;阳明经筋病变膝在支撑中期旋外均值大于正常(P<0.05), 少阳经筋病变膝在推离期旋内均值大于正常(P< 0.05), 而三阴经筋病变膝在推离期旋外均值大于正常(P<0.05);阳明经筋病变膝地面最大垂直反力出现时间显著推迟 (P<0.05);而少阳经筋病变膝和三阴经筋病变膝与正常值相比无统计学差异(P>0.20).结论KOA患者不同经筋证型在步角、足跟部冲量、旋内旋外值、地面最大垂直反力出现时间等步态指标上各有不同, 可以作为KOA患者经筋辨证的客观依据
Minimally invasive esophagectomy

Esophageal resection is associated with a high morbidity and mortality rate. Minimally invasive esophagectomy (MIE) might theoretically decrease this rate. We reviewed the current literature on MIE, with a focus on the available techniques, outcomes and comparison with open surgery. This review shows that the available literature on MIE is still crowded with heterogeneous studies with different techniques. There are no controlled and randomized trials, and the few retrospective comparative cohort studies are limited by small numbers of patients and biased by historical controls of open surgery. Based on the available literature, there is no evidence that MIE brings clear benefits compared to conventional esophagectomy. Increasing experience and the report of larger series might change this scenario
ICC density predicts bacterial overgrowth in a rat model of post-infectious IBS

AIM: To investigate the interstitial cells of Cajal (ICC) number using a new rat model. METHODS: Sprague-Dawley rats were assigned to two groups. The first group received gavage with Campylobacterjejuni (C. jejuni 81-176. The second group was gavaged with placebo. Three months after clearance of Campylobacter from the stool, precise segments of duodenum, jejunum, and ileum were ligated in self-contained loops of bowel that were preserved in anaerobic bags. Deep muscular plexus ICC (DMP-ICC) were quantified by two blinded readers assessing the tissue in a random, coded order. The number of ICC per villus was compared among controls (C-), Campylobacter recovered rats without small intestinal bacterial overgrowth (SIBO), and Campylobacter recovered rats with SIBO. RESULTS: Three months after recovery, 27% of rats gavaged with C. jejuni had SIBO. The rats with SIBO had a lower number of DMP-ICC than controls in the jejunum and ileum. Additionally there appeared to be a density threshold of 0.12 DMP-ICC/villus that was associated with SIBO. If ileal density of DMP-ICC was < 0.12 ICC/villus, 54% of rats had SIBO compared to 9% among ileal sections with > 0.12 (P < 0.05). If the density of ICC was < 0.12 DMP-ICC/villus in more than one location of the bowel, 88% of these had SIBO compared to 6% in those who did not (P < 0.001). CONCLUSION: In this post-infectious rat model, the development of SIBO appears to be associated with a reduction in DMP-ICC. Further study of this rat model might help understand the pathophysiology of postinfectious irritable bowel syndrome
Wavelet Packet-based Feedback System for Medical Image Fusion

In order to meet the requirements of medical research, diagnosis and treatment, a new algorithm for image fusion based on the wavelet packet transform in conjunction with both subjective and objective assessments is put forward in the paper. Compared to the wavelet transform, the wavelet packet transform is more intricate and effective for the medical image fusion. As indicated by the experimental results, parameters of the feedback system of the new algorithm are significantly superior to those of the wavelet transform, with practicability and accuracy
Radiator Optimization of LED Street Lamp Based on Parameterized Language APDL of ANSYS

Heat management is one of the burning questions for the spreading of LED lighting, one solution for which is to design radiators reasonably. In this article, a radiator sold on the market was modeled on ANSYS using APDL and an optimum radiator structure was achieved by making use of the optimization function of ANSYS. The radiator efficiency was increased by optimizing several parameters simultaneously. Experimental results indicate that the volume of the optimum radiator is decreased to 75. 79% of that of the initial model with the junction temperature remaining at the primary level, which saves a considerable amount of material with higher radiant efficiency
Organochlorine Pesticides (OCPs) in Soils Along the Eastern Slope of the Tibetan Plateau

Soil samples collected from several sites along an altitudinal transect on the eastern slope of the Tibetan Plateau were analyzed for hexachlorobenzenes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs). The results showed that HCHs and DDTs were found in the soil samples from the remote high altitude areas away from source regions, which confirmed the long-range atmospheric transport phenomenon of these organochlorine pesticides (OCPs) insecticides. The OCP concentrations in the soils had a significant negative correlation with altitude; they showed a trend to increase with decreasing altitude, but the increase was not continuous, being interrupted at some moderate-altitude sites on the transect. The distances from the source region, landforms, soil properties, and physical-chemical properties of OCPs were more important than total organic carbon content to the distribution of OCPs in soils disturbed by human activities. An analysis of the compositions of HCH isomers and DDTs revealed predominantly low ratios of a-HCH to y-HCH, ranging from 0.06 to 4.79, which suggested current lindane inputs. On the other hand, low p, p'-DDT/p, p'-DDE and o, p'-DDT/p, p'-DDT ratios were observed, indicating mainly aged historical DDT residues in the study area
Estimating Leaf Chlorophyll Content Using Red Edge Parameters

Hyperspectral remote sensing makes it possible to non-destructively monitor leaf chlorophyll content (LCC). This study characterized the geometric patterns of the first derivative reflectance spectra in the red edge region of rapeseed (Brassica napus L.) and wheat (Triticum aestivum L.) crops. The ratio of the red edge area less than 718 nm to the entire red edge area was negatively correlated with LCC. This finding allowed the construction of a new red edge parameter, defined as red edge symmetry (RES). Compared to the commonly used red edge parameters (red edge position, red edge amplitude, and red edge area), RES was a better predictor of LCC. Furthermore, RES was easily calculated using the reflectance of red edge boundary wavebands at 675 and 755 nm (R675 and R755) and reflectance of red edge center wavelength at 718 nm (R_(718)), with the equation RES = (R_(718) - R_(675))/(R_(755) - R_(675)). In addition, RES was simulated effectively with wide wavebands from the airborne hyperspectral sensor AVIRIS and satellite hyperspectral sensor Hyperion. The close relationships between the simulated RES and LCC indicated a high feasibility of estimating LCC with simulated RES from AVIRIS and Hyperion data. This made RES readily applicable to common airborne and satellite hyperspectral data derived from AVIRIS and Hyperion sources, as well as ground-based spectral reflectance data
Arbuscular Mycorrhizal Fungal Inoculation Enhances Suppression of Cucumber Fusarium Wilt in Greenhouse Soils

A pot experiment was conducted to study the plant growth and fruit yields of cucumber (Cucumis sativus L.) on a greenhouse soil with or without inoculation of arbuscular mycorrhizal fungi (AMFs) and Fusarium ozysporum f. sp. cucumerinum under unsterilized conditions. Two AMF inocula were tested: only one AMF strain Glomus caledonium 90036 and an AMF consortium mainly consisting of Glomus spp. and Acaulospora spp. There were four treatments including no inoculation (control), inoculation with F. oxysporum but without mycorrhizae (FO), inoculation with F. oxysporum and G. caledonium (FO+M1), and inoculation with F. ozysporum and the AMF consortium (FO+M2). Cucumber plants were harvested at weeks 3 and 9 after transplanting. Compared with the control, the FO treatment without AMF inoculation had less biomass both at weeks 3 and 9 (P< 0.05) and had higher incidence of Fusarium wilt and produced no cucumber fruit at week 9. Both FO+M1 and FO+M2 treatments had higher mycorrhizal colonization than the treatments which received no AMF inoculation at week 3 (P< 0.05), but only the FO+M2 treatment elevated plant biomass, decreased the incidence of Fusarium wilt, and improved cucumber yields to the same level as the control at week 9. The results indicated that the AMF consortium could suppress Fusarium wilt of cucumber and, therefore, showed potential as a biological control agent in greenhouse agroecosystems
异步电动机矢量控制(一)

交流电动机的矢量控制变频调速系统已在高性能变频调速领域得到最广泛应用, 特别是异步电动机系统用得最多, 但它的原理较难理解.介绍这原理的书籍和论文已很多~[1-2], 它们大多用抽象的矩阵公式描述电动机, 从它出发推导控制策略, 理论严谨, 但较抽象, 工程技术人员难看懂.本讲座的不同之处首先是从物理概念出发来阐述矢量控制原理, 无抽象的矩阵推导
小半夏汤研究述要

小半夏汤出自张仲景<<金匮要略·痰饮咳嗽病脉证并治第十二>>~[1], 由半夏、生姜组成, 功能祛痰降逆, 主治痰饮停胃、胃气上逆所致的呕吐, 被后世尊为止呕之祖方.本文对小半夏汤的源流发展、临床应用以及实验研究作以回顾与评述, 以期对拓展本方研究思路有所裨益。
中药配方颗粒研究的思考

中医药是中国人以其独特的智慧, 以"天人合一"、"取象比类"的思维模式理解和认识生命, 对发生在人体复杂生命体系中的疾病进行治疗长期实践取得的伟大文化成就和科学成就, 是我国拥有自主知识产权的领域, 其核心思想和精髓是"辨证论治"、"整体观念", 即根据不同的病人和不同的情况, 因病因时因地制宜和多成分、多靶点、多层次的进行调节和治疗, 使其在疾病的治疗上显示某些独特的疗效, 尤其引人注目的是, 面对一些西医药也束手无策的疑难杂症, 中医药更显示了其独特的治疗优势
络必通颗粒对DPN大鼠神经电生理及Na~+, K~+-ATP酶活性的影响

目的:通过观察络必通对糖尿病周围神经病变大鼠血糖、糖化血红蛋白、神经电生理、Na~+, k~+-ATP酶活性等指标的作用, 明确络必通的作用靶点和相关药效机理.方法:(1)建立DPN大鼠模型;(2)络必通药效观察:按随机数字表法对正常大鼠与DPN大鼠分组, 分别为正常组、模型组、阳性对照组(糖脉康)、络必通小、中、大剂量组, 用药8周.结果: (1)糖尿病大鼠周围神经病变模型建立成功;(2)络必通颗粒有一定的降血糖作用, 并对糖化血红蛋白有一定改善, 与模型组比较有显著差异(P<0.05);(3)经络必通颗粒治疗后的糖尿病大鼠坐骨神经中的Na~+, k~+-ATP酶活性升高, 并对糖尿病大鼠周围神经功能有明显的改善作用, 与模型组比较有差异(P<0.05);结论:络必通对大鼠糖尿病及其周围神经病变有一定的治疗作用, 可能与降低血糖、糖化血红蛋白, 提高外周神经Na~+, k~+-ATP酶活性, 改善微循环有关
HPLC法测定兰考泡桐花中洋芹素和熊果酸的含量

目的:测定兰考泡桐花中主要成分洋芹素和熊果酸的含量.方法:采用高效液相色谱法测定洋芹素和熊果酸的含量, 分析柱为ZORBAX XDB-C_(18)柱(4.6 mm×250 mm, 5μm);洋芹素以甲醇一水(45:55)为流动相, 检测波长340 nm;熊果酸以甲醇-水(90:10)为流动相, 检测波长210 nm;流速为1.0 mL/min, 柱温24℃.结果:洋芹素进样量在0.22-1. 10μg范围内具有良好的线性关系(R~2=0.9999)平均加样回收率为99.45%, RSD为1.50%;熊果酸进样量在2.08~ 10.40μg范围内具有良好的线性关系(R~2=0.9983);平均加样回收率为99.35%, RSD为1.85%.结论:该方法简便、准确、重复性好, 可用于测定洋芹素和熊果酸的含量