高频超声联合PSV、RI、Adler血流分级在甲状腺良恶性结节中的诊断价值

本研究探讨高频超声联合彩色多普勒超声参数在诊断甲状腺良恶性结节中的价值。选取40例甲状腺癌患者作为观察组,42例甲状腺良性结节患者作为对照组,比较两组、不同N和T分期患者高频超声联合彩色多普勒超声参数,并对数据进行统计分析。两组结节形态、边界、回声、钙化超声征象比较,差异具有统计学意义(P<0.05)。观察组A/T_C、A/T_L、TI-RADS分级评分、PSV、RI、Adler血流分级评分高于对照组(P<0.05)。各参数联合诊断恶性甲状腺结节的AUC为0.902,诊断N1分期的AUC为0.879,诊断Ⅲ+Ⅳ分期的AUC为0.915,均大于任一单一参数(P<0.05)。可见采用高频超声、彩色多普勒超声联合观测甲状腺结节征象与A/T_C、A/T_L、TI-RADS分级、PSV、RI、Adler分级,可诊断结节性质,并能评估恶性结节患者术前肿瘤分期,为临床治疗、决策提供量化参考。     

利用电流积分器和峰值保持单元改进固体电极上的多重峰测量和提高记录仪记录伏安图的精确性

本文推荐采用电流积分器和峰值保持(检测)器作为插入单元,以测量积分电量代替峰高测量,改进固体电极上的测量浓度范围。并采用峰值检测器提高记录仪的响应,使之适用于500～1000mV/s扫描速率下的伏安测定。本文以T(Ⅳ)作为例子证明上述优点。     

无线、远程对产妇血流动力学的连续监测技术的临床应用研究

探究一种创新的、无创的、反射式光体积描记术为基础的设备对产妇分娩和分娩期间血流动力学的连续监测情况。选取81例足月低风险产妇参与本研究。给产妇佩戴新型反射式PPG设备,该设备每5 s自动采集心输出量(CO)、血压(BP)、每搏输出量(SV)、全身血管阻力(SVR)、心率(HR),并将所有数据上传到基于智能手机的应用程序和数据云。使用Power BI分析工具(Microsoft)对收集的数据进行大数据分析。比较胎膜破裂、硬膜外麻醉、胎儿分娩和胎盘排出前后的平均测量值。结果显示,硬膜外麻醉与CO轻微升高相关(P<0.05),原因是HR和SV均无显著增加。在SVR反向下降时,血压保持稳定(P<0.05)。胎儿分娩与CO峰值相关,之后CO迅速下降(P<0.05)。平均血压在整个分娩过程中保持稳定,胎儿分娩时略有增加(P<0.05),反映出CO增加和SVR降低(P<0.05)。胎盘排出与CO的第二个峰值和SVR的降低相关。因此,一种新型反射式PPG设备可用于对产妇在分娩和分娩期间的血流动力学监测中。并利用这些数据确定正常值和异常值,以便在分娩和分娩期间制定安全方案。     

鸭肉中克百威和西维因的同步荧光光谱解析及定量分析

采用同步荧光法分析了鸭肉中农药的荧光特征,其次利用同步荧光峰值法对鸭肉中农药残留进行定量分析。发现2种农药鸭肉体系中都有一个同步荧光峰,分别是克百威的荧光特征(Δλ=120 nm,λex=335 nm)和西维因的荧光特征(Δλ=140 nm,λex=322 nm);在一定浓度范围内荧光强度与浓度良好的线性关系,其克百威-鸭肉和西维因-鸭肉体系中预测样本的相关系数(R2)分别为0.991和0.994。为快速、准确检测鸭肉中农药残留含量提供了新方法。     

缺血性脑卒中患者MCA血流速度及脉动指数变化的相关分析

目的探讨并分析缺血性脑卒中患者MCA血流速度及脉动指数的变化。方法选取2016年1月—2017年1月就诊于佳木斯大学附属第一医院神经三科门诊及住院部的120例缺血性脑卒中住院患者,其中男性56例,女性64例。使用经颅多普勒超声诊断仪探查患者双侧大脑中动脉,测出患者大脑中动脉的血流速度和脉动指数。比较所有患者患侧与健侧的大脑中动脉血流速度和脉动指数变化。结果所有患者患侧大脑中动脉收缩期最快血流速度(t=15.63,P﹤0.05)、舒张期最快血流速度(t=10.61,P﹤0.05)明显小于健侧;而平均血流速度患侧与健侧比较无统计学意义(t=0.58,P0.05);并且大脑中动脉供脉动指数值明显高于健侧(t=3.54,P﹤0.05)。结论缺血性脑卒中患者大脑中动脉供血区脑梗死,临床进行TCD观察患者大脑中动脉血流速度及脉动指数的变化的临床诊疗,预判病情变化有指导意义。     

超声多模态评分、血流参数在不明原因复发性自然流产患者体内的变化及联合预测价值

本文探讨超声多模态评分、血流参数在不明原因复发性自然流产患者体内的变化及联合预测价值。选取不明原因复发性自然流产(URSA)早孕患者86例,根据孕12周内是否发生流产分为未流产组(62例)与流产组(24例),另选择同期正常早孕孕妇86例作为对照组。均行子宫内膜超声多模态评分、子宫动脉血流参数[搏动指数(PI)、阻力指数(RI)、收缩期峰值流速/舒张末期流速(S/D)]检查,发现超声多模态评分、PI、RI、S/D与URSA早孕患者β-HCG、孕酮及发生流产显著相关,联合预测URSA早孕患者发生流产的AUC为0.886,95%CI为0.806～0.965,敏感度为83.33%,特异度为83.87%,优于各指标单独预测。由此可见,URSA早孕患者的超声多模态评分和血流参数呈异常状态,联合预测流产的价值良好,能为临床及早采取干预措施提供有效信息。     

改进计时电流法的数学模型和电路实现

当采用电化学计时电流法对样品进行检测时,由于检测系统的延迟,采集到的电化学信号会产生偏差,这种现象在多通道电化学信号快速采集时尤为明显.为克服该问题,我们提出一种新的电化学方法来快速产生电流峰值,通过测量峰值快速准确地测出被测物浓度.本文首先为该方法建立理论模型,推导出电流峰值与被测物的浓度关系;再引入经典控制理论中的控制环节来改进传统电化学电路以实现该方法,并加入峰值检测电路来准确获取电流峰值信号;最后,利用该方法研究K3[Fe(CN)6]和3,3′,5,5′-四甲基联苯胺(TMB)溶液的电化学反应,证明了本方法相比传统计时电流法具有更高的信噪比和灵敏度,电流峰值与浓度呈线性关系,并且检测结果不受采样时间延迟的影响,克服了计时电流法的不足.     

Synthesis and structure of hydroxyisoxazolidines and derivatives of hydroxylamine and alkenals

The reactions of N-substituted hydroxylamines with alkenals serve as a method for the synthesis of the corresponding 2-substituted 3(5)-hydroxyisoxazolidines. The reaction pathway is determined by the nature of the substituent attached to the nitrogen atom. Ring-chain isomerism has been detected in these newly obtained compoundsTranslated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1270–1276, September, 1987.     

Investigation of adhesion and mobility of polyurethane and epoxy-rubber glues and adhesives

The values of activation parameters in uncured and cured epoxy resins, rubbers, and blends thereof are investigated. The dependences of activation energy and adhesion strength of epoxy-rubber compositions on rubber content are determined. The correlation of adhesion and activation energy values for polyurethane rubber and epoxy-rubber compositions is shown.     

Crystal and molecular structure of aroyl- and acetylhydrazones of acet- and benzaldehydes

Aroyl- and acetylhydrazones of acet- (I) and benzaldehydes (IV) and benzoylhydrazones of acet- (II) and benzaldehydes (III) were studied by x-ray structural and quantum-chemical methods in order to establish their structures. Compund (I) was the EEZ structure in the crystal. Calculations and spectral data showed that the EEE form occurs in nonpolar solvents and in the gas phase. According to crystallographic data molecules (I)–(IV) are the E-isomers (relative to the N-N bond) and the hydrazone fragments are planar. Intermolecular N-H...O H-bonds from in the crystals. The data obtained suggest that the majority of acylhydrazones are conformationally rigid on dissolution although exceptions do occur. Apparently the reasons for the difference of acetyl- and benzoylhydrazones in electrocarboxylation reactions are electronic and not steric factors.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 75–81, January, 1991.     

Mass and NMR spectra of haplophyllidine and perforine and of their derivatives

Conclusions The mass and NMR spectra of haplophyllidine, perforine, and their derivatives have been studied. The influence of the open and cyclic forms of the molecular ion on the nature of the fragmentation has been discussed. The main routes of fragmentation of the compounds considered are due to the presence of substituents at C₈ and C₄.Khimiya Prirodnykh Soedinenii, Vol. 5, No. 4, pp. 273–279, 1969     

Synthesis and characterization of triazenide and triazene complexes of ruthenium and osmium

Triazenide [M(eta2-1,3-ArNNNAr)P4]BPh4 [M = Ru, Os; Ar = Ph, p-tolyl; P = P(OMe)3, P(OEt)3, PPh(OEt)2] complexes were prepared by allowing triflate [M(kappa2-OTf)P4]OTf species to react first with 1,3-ArN=NN(H)Ar triazene and then with an excess of triethylamine. Alternatively, ruthenium triazenide [Ru(eta2-1,3-ArNNNAr)P4]BPh4 derivatives were obtained by reacting hydride [RuH(eta2-H2)P4]+ and RuH(kappa1-OTf)P4 compounds with 1,3-diaryltriazene. The complexes were characterized by spectroscopy and X-ray crystallography of the [Ru(eta2-1,3-PhNNNPh){P(OEt)3}4]BPh4 derivative. Hydride triazene [OsH(eta1-1,3-ArN=NN(H)Ar)P4]BPh4 [P = P(OEt)3, PPh(OEt)2; Ar = Ph, p-tolyl] and [RuH{eta1-1,3-p-tolyl-N=NN(H)-p-tolyl}{PPh(OEt)2}4]BPh4 derivatives were prepared by allowing kappa1-triflate MH(kappa1-OTf)P4 to react with 1,3-diaryltriazene. The [Os(kappa1-OTf){eta1-1,3-PhN=NN(H)Ph}{P(OEt)3}4]BPh4 intermediate was also obtained. Variable-temperature NMR studies were carried out using 15N-labeled triazene complexes prepared from the 1,3-Ph15N=N15N(H)Ph ligand. Osmium dihydrogen [OsH(eta2-H2)P4]BPh4 complexes [P = P(OEt)3, PPh(OEt)2] react with 1,3-ArN=NN(H)Ar triazene to give the hydride-diazene [OsH(ArN=NH)P4]BPh4 derivatives. The X-ray crystal structure determination of the [OsH(PhN=NH){PPh(OEt)2}4]BPh4 complex is reported. A reaction path to explain the formation of the diazene complexes is also reported.     

Glycolate and Thioglycolate Complexes of Rhenium and Their Oxidative Elimination of Ethylene and of Glycol

Selenium dioxide and osmium tetroxide are effective reagents and catalysts for olefin oxidation, although, owing to their toxicity, reservations remain as to their applicability.^[1] We are therefore seeking more easily handled metal oxides that are soluble in organic solvents and that are as effective as osmium tetroxide in carrying out stereospecific cis hydroxylation of olefins. The rhenium(VII ) oxide 1 , which has meanwhile become readily accessible, is a favorable candidate.^[2]     

The chemical transport of molybdenum and tungsten and of their dioxides and sulfides

Experiments have been made and an extensive thermodynamic discussion has taken place concerning the chemical transport of Mo, W, MoO₂, WO₂, MoS₂ and WS₂ in the presence of iodine. Efforts have been made to find the species via which Mo and W can migrate within the gas phase.Results: In each case the transport proceeds via the oxide iodides MoO₂J₂ and WO₂J₂ respectively, as already known for the dioxides. Thus the chemical transport of Mo, W, MoS₂ and WS₂ needs not only J₂ but also H₂O, usually liberated from the wall of the quartz ampoule.By means of J₂ + H₂O, the metals can be transported into the high temperature region of the ampoule (e.g., 1050 → 1150°C), whereas the transport of the sulfides proceeds in the opposite direction (e.g., 900 → 700°C).For the sulfide-transport the influence of the ratio of the transport agents $\text{J}{}_2\text{H}{}_2\text{O}$ has been discussed.The water content of the quartz glass out of which the ampoules are made is an important source for water, influencing the reactions.The addition of graphite which considerably lowers the H₂O partial pressure prevents any transport of the metals or the sulfides, which proves that the use of J₂ alone as a transport agent is insufficient in these cases.The gaseous iodides MoJ_x and WJ_z are without any importance under the experimental conditions used for the transport of the metals, their dioxides and sulfides.The partial pressures of MoO₂(OH)₂ and WO₂(OH)₂ under the experimental conditions chosen may usually be neglected. But in the system $\text{MoO}{}_2\text{H}{}_2\text{O}$ the transport via MoO₂(OH)₂ (1000 → 800°C) has been observed.The synthesis of MoO₂ and WO₂, starting with the elements or with powder of metal and trioxide is promoted by the addition of J₂. The reaction steps involved are discussed.