氯氮平在家兔体内的分布研究

本文用薄层色谱扫描法研究了氯氮平在染毒家兔体内的分布情况，以639mg／kg剂量给家兔灌胃使其染毒致死．检验结果表明，其体内血、尿、胆汁、肝、脾、肾、心、肺和脑内氯氮平的浓度分别为19．1±6．9、50．2±12．6、75．9±12．5、25．9±4．0、34．0±47、13．3±2．2、5．0±2．3、20．0±4．3和43．6±43．4μg／g或μg／ml．     

酒精对乌头碱毒物动力学的影响

用反相高效液相色谱法测定生物样品中的乌头碱．给新西兰兔灌服１．５ｇ／ｋｇ短柄乌头后，乌头碱在免休内的毒物动力学过程为二室开放模型，其Ｋａ、Ａ、Ｂ值分别为１．１６２９±０．４０５３，０．６０４６±０．２５７４，１．１６０７±０．３７８１ｕｇ／ｍｌ．研究了灌服５．７５ｇ酒精对该动力学过程的影响，表明酒精不改变其模型类型，但可明显加速乌头碱的吸收和分布（Ｐ＜０．０１），对消除过程无明显影响，其Ｋａ、Ａ、Ｂ值分别为２．４０２６±０．５３７６，１．２０５１±０．５３２８，１．２０３７±０．４０９５μｇ／ｍｌ。说明酒精可增加短柄乌头的毒性。     

对女性肋骨进行组织形态测量推断年龄

探讨人类密质骨的年龄变化规律 ,为法医学、人类学利用骨骼推断年龄提供新方法。收集 6 7例中国北方汉族女性右侧第六肋骨的中 1/3段 ,制作脱钙骨切片 ,在计算机图像分析仪上测量 9项组织形态学参数 ,并进行多元逐步回归分析 ,得到一个推断年龄的多元回归方程 :^Y =31 2 6 4+0 86 8X2 +2 86 6 93X4 +0 6 89X7-778 874X8-0 0 0 6X9,复相关系数和标准误分别是 0 92 3和 4 0 8。经 2 5例已知年龄的标本检验 ,预测年龄的误差在± 5岁以内的可达 84% ,误差在± 8岁以内的可达 10 0 %。结果表明 :应用肋骨的组织结构特征可准确推断死者年龄     

论县级以上地方人大监督权的有效行使

未作附带阑尾切除组相比较 ,作附带阑尾切除组较年轻 (平均年龄 x±s:4 4± 9.6岁比 4 8± 13.6岁 ,P =0 .0 2 )和有较低的平均体质指数(2 6 .1± 6 .0kg/m2 比 2 9.8± 8.9kg/m2 ,P =0 .0 0 0 9)。关于术后随访的并发症 ,附带切除与未切除阑尾两组间无显著差异。在作附带阑尾切除组的平均住院时间比未切除阑尾组显著延长 (3.6± 1.5 2天比 3.1± 1.1天 ,P =0 .0 0 6 )。然而 ,当患者在术后 2天选择性进食时 ,此差异无显著性延长 (3.16± 1.13比 3.0 4± 1.13天 ,P =0 .5 0 7) ,而从分析中剔除。 31%的组织学标本是异常的 ,管腔纤维闭塞…     

阿普唑仑在家兔体内的分布研究

建立生物检材内阿普唑仑的薄层扫描定性定量检测方法，研究阿普唑仑在染毒家兔体内的分布情况。家兔按21mg/Kg剂量灌胃染毒后4h，其体内肝、脾、肾、肺、心、脑、血、胆汁和尿内阿普唑仑的浓度分别为19．6±6．1、3．3±0．5、3．5±0．3、0．4±0．1、0．4±0．1、1．6±1．8、4．0±1．3、20．4±8．5和8.6±2．4（ug／g或ug／ml）。阿普唑仑在染毒家兔体内的分布不均匀，血、胆汁和尿是阿普唑仑中毒死者毒物分析较好的检材。     

过敏性休克死亡体内血栓素B_2含量变化的研究

本研究采用非平衡法,对青霉素和血清过敏性休克致死机体的血浆、肺、脾和肾中血栓素B_2(Thromboxane,TXB_2)进行放射免疫分析(RIST)。正常对照组血浆中TXB_2含量是9.63±1.77(ng/ml),实验组休克前是9.264±3.01(mg/ml),两者P>0.05。青霉素休克组30.36±10.72(ng/ml);血清休克组40.10±6.51(ng/ml),与对照及休克前相比均P<0.01。对照、青霉素和血清过敏性休克肺中TXB_2依次为:89.90±6.57、171.96±18.07和187.70±18.89(ng/g)(P<0.01)。脾中依次为:68.334±10.09、137.68±15.97和173.72±18.75(ng/g)(P<0.01)。肾中依次为:73.89±5.05、128.30±19.99和152.15±17.77(ng/g)(P<0.01)。过敏性休克致死的机体置室温6或12h,或冰箱48h后,不明显影响TXB_2的检测。研究者认为:发生过敏性休克时,血栓素系统发生剧烈变化,表现为血和脏器中TXB_2的增加,可为确定过敏性休克死亡提供一个重要的生化指标。     

家庭内施暴青年患者临床特点分析

本文对13例在家庭内施暴青年住院患者的临床特点做了观察和分析。发现患者的主要临床相是对父母的辱骂、殴打等暴力行为，但是暴力行为仅局限于家庭之内。多数患者（53.8％）有较长的幼年寄养史（3、6±2．4年，×±SD，下同）。少年期无品行不良史。12例在校时学习成绩优秀。父母文化层次较高，多数父亲性格软弱或相对软弱。发病诱因多为需要自立的生活事件。发病年龄平均17.8±2．6岁，平均病程3．3±2．4年。男女比例约2:1。患者具有任性、自我中心的性格特征，但是未达到人格障碍的程度。家庭心理治疗合并镇静药物对半数患者有效。文章讨论了该类患者的发病原因。     

利多卡因在蛛网膜下腔麻醉致死犬体内的分布

目的 观察利多卡因蛛网膜下腔致死犬体内的分布及脊髓液、脊髓与血液中利多卡因含量的比值。方法薄层扫描法检测血、脊髓液、侧脑室液、各节段脊髓和各脏器组织中利多卡因含量。结果 蛛网膜下腔麻醉致死犬脊髓液、各节段脊髓、脑、血液和其它各脏器中利多卡因含量分别为485.6±51.5μg/ml、226.8±35.2-353.8±44.0μg/g、44.9±11.51μg/g、40.3±6.5μg/ml和13.5±13.7-38.0±9.8μg/g。脊髓液与血液中利多卡因含量之比为12.4±2.7,各节段脊髓与血液之比为5.7±0.9-9.0±2.6。结论 蛛网膜下腔麻醉致死犬脊髓液中利多卡因含量最高,脊髓中次之,血液和其它组织中含量较低。脊髓液/血液、脊髓/血液比值平均可达12.4和5.7-9.0。     

广泛软组织挫伤后血中胆红素和肌红蛋白的改变

目的 探索法医临床学评定广泛软组织挫伤程度量化指标。方法 采用改良的咖啡因法(J-G法)、放射免疫法分别检测广泛软组织挫伤后的人和大鼠血液中的胆红素(Bil)和肌红蛋白(Mb)浓度。结果 大鼠挫伤面积为6％、18％、30％,其血清胆红素浓度分别为4.86±0.4648、7.05±0.2915、8.52±0.1549μmol/1;肌红蛋白浓度分别为16.9140±0.9803、23.3435±1.3349、31.2490±1.8714ng/ml。二者经统计学分析P<0.001,均有显著性差异。结论测定血液中胆红素、肌红蛋白浓度有望成为法医临床学准确评估广泛软组织损伤程度的可靠量化指标。     

盐酸曲马多在大鼠体内的分布特点

目的观察盐酸曲马多在大鼠体内的分布及其特点。方法大鼠以3倍和6倍LD50228mg/kg剂量盐酸曲马多灌胃染毒致死,取材,薄层色谱法检测其心、肺、肝、脾、肾、大脑和血内盐酸曲马多的浓度。结果3倍LD50剂量组大鼠肾、肺、血、肝、大脑、脾和心组织盐酸曲马多的浓度分别为112±15、59±17、53±31、32±19.7、22±11.5、20±20、16.7±8.3μg/g或μg/ml;6倍LD50剂量组大鼠血、肺、肝、心、肾、大脑和脾中盐酸曲马多的浓度分别为107.6±7.2、26.3±20、11.7±6.6、11.2±7.2、10.3±3.6、6.38±0.2、6.1±0.3μg/g或μg/ml。结论3倍LD50剂量组大鼠,肾、肺、血内盐酸曲马多浓度最高;6倍LD50剂量组大鼠血、肺、肝中盐酸曲马多的浓度最高。盐酸曲马多中毒时,血、肝、肺和肾可以作为法医毒物分析的检材。     

Estimation of age from a tooth by means of racemization of an amino acid, especially aspartic acid--comparison of enamel and dentin.

In a study of age estimation from teeth by means of measuring racemization of aspartic acid (Asp), a representative amino acid, the accuracy of data from enamel and dentin in the same tooth was compared. The correlation of D/L ratio of aspartic acid with actual age gave the following parameters: r = 0.928, sigma = +/- 5.2, k = 4.47 x 10(-4) yr-1 in enamel and r = 0.995, sigma = +/- 1.4, k = 5.75 x 10(-4) yr-1. The difference in ages between one estimated by the D/L ratio and the actual one was within +/- 3 years in dentin, while in enamel an error of from 2 to 11 years was observed. Reaction rate constants of the racemization in a dry postmortem state (15 degrees C) were calculated as k = 9.70 x 10(-8) yr-1 in enamel, and k = 1.33 x 10(-7) yr-1 in dentin. Compared to rates determined from teeth recently extracted from living subjects, the rate was higher in dentin than in enamel. These data reconfirmed that dentin is superior to enamel in making exact age estimations from teeth.     

Age estimation using the racemization of amino acid in human dentin

This study was made to improve the validity of age estimation from teeth using amino acid racemization. The correlation between actual age and the D/L ratio of aspartic acid was investigated by analyzing not only the total amino acid but also its fractionated substances, insoluble collagen and soluble peptide. The coefficient values of correlation between the D/L ratio and actual age in adult lower central incisors were 0.996 (sigma = +/- 1.0 year) for the total amino acid, 0.988 (sigma = +/- 1.8 years) for insoluble collagen, and 0.997 (sigma = +/- 0.9 years) for soluble peptide. The corresponding figures in adult first premolars were 0.991 (sigma = +/- 1.6 years), 0.988 (sigma = +/- 1.9 years), and 0.994 (sigma = +/- 1.4 years), respectively. The reactive velocity of aspartic acid racemization was highest for soluble peptide in both the lower central incisors and first premolars and approximately three times as rapid as that for total amino acid. As a result, age estimated from the analysis of soluble peptide was most accurate. The velocity for insoluble collagen was slightly lower than that for total amino acid. Age estimation was attempted from the teeth of an unknown body. These results suggest that the analyses, not only of total amino acid in dentin but also of its fractionated and extracted substances, can lead to higher reliability in age estimation. Soluble peptide, in particular, has been found to be most effective.     

Age Estimation by Amino Acid Racemization in Human Teeth

Abstract: When an unidentified body is found, it is essential to establish the personal identity of the body in addition to investigating the cause of death. Identification is one of the most important functions of forensic dentistry. Fingerprint, dental, and DNA analysis can be used to accurately identify a body. However, if no information is available for identification, age estimation can contribute to the resolution of a case. The authors have been using aspartic acid racemization rates in dentin (D‐aspartic acid/L ‐ aspartic acid : D/L Asp) as an index for age estimation and have obtained satisfactory results. We report five cases of age estimation using the racemization method. In all five cases, estimated ages were accurate within a range ±3 years. We conclude that the racemization method is a reliable and practical method for estimating age.     

Age at death determinations for autopsied remains based on aspartic acid racemization in tooth dentin: importance of postmortem conditions

The extent of aspartic acid racemization in human dentin can be used to assess chronological age of the individual. This novel chemical method of aging human remains has potential applications in forensic sciences. Six autopsy cases have been analyzed for D/L aspartic acid contents, and their ages at death calculated. Independent age information came from known identity, tooth maturation, or tooth wear estimations. The six cases represented a range of postmortem fates: recent demise, burial, and ground surface exposure. Five samples, four recently deceased and one a burial, showed racemization ages in close agreement with other age data. One specimen, subjected to 51 days of open air exposure, exhibited a vastly inflated racemization age. Postmortem conditions are crucial to the accuracy of racemization age at death measurements.     

Age Estimation by Racemization Method in Teeth: Application of Aspartic Acid,Glutamate, and Alanine

Abstract: Here, we report on an experimental approach of simultaneous determination of various amino acids racemization (AAR) rates in teeth. We evaluated the measurements of aspartic acid (Asp), glutamate (Glu), and alanine (Ala) isolated from dentin. Asx D/L rates from total amino acid fraction, generally used for age estimation, showed high correlation (r = 0.98) with age. As Glx and Ala showed very slow racemization kinetics in TA, we performed further analysis of the acid‐soluble protein (SP) fraction. The results supported improved correlation between age and D/L rates for Glu (r = 0.84) and Ala (r = 0.85), as well as for Asp (r = 0.98). By providing further elucidation on dentin protein racemization, the technique offers a considerable opportunity to involve other amino acids in age estimation studies. As the process does not require additional separation steps, the method can be easily adapted to existing protocols.     

Racemization of aspartic acid from human dentin in the estimation of chronological age

The estimation of chronological age in cadavers, human remains and in living human beings by various methods is discussed. These methods, which are based on the age dependent non-enzymatic changes of l-form amino acids to d-form amino acids, mainly aspartic acid, are among the most reliable and accurate methods to date. Most of these methods use gas chromatography (GC). In this review, results of aspartic acid racemization in dentin at different targets are discussed. In addition, pre-considerations and guidelines are given for the selection of dentin from teeth. A pilot project was run to evaluate the efficiency of high performance liquid chromatography (HPLC) coupled with fluorescence detection. New buffer conditions were found to obtain stable derivatives of aspartic acid enantiomers for the estimation of racemization.     

Application of aspartic acid racemization to forensic odontology: post mortem designation of age at death

The extent of racemization of aspartic acid in the dentin of healthy, carious and impacted teeth was used to define the ages of individuals at the time of their death. These determinations were performed with an error of +/- 4 years. This method holds the promise of simplifying procedures in, and extending the application of forensic odontology. The current error range of this method may be reduced by analyzing teeth of the same positional types from deceased individuals of known age. Using this method, it appears that post mortem preservation of up to 10 years has a negligible effect on the values determined for the age of individuals at death.     

The use of the D-, L- aspartic ratio in decalcified collagen from human dentin as an estimator of human age

Among the methods dealing with the age estimation, the evaluation of the ratio of the D-, L- form of the aspartic acid in tissues with a low metabolic turnover is considered to be the most precise. We introduced demineralization of the dentin with 0.5 M EDTA adjusted to pH = 7.4. The advantage of such a procedure is that after demineralization we obtained pure insoluble protein (collagen) and soluble noncollagenous proteins in one step. In this study we analyzed insoluble collagen. The amino acids obtained after the hydrolysis were derivatized into TFA isopropyl esters and analyzed by gas chromatography on Chirasil L-Val capillary column. We analyzed human dentin from the lower canines. The correlation coefficient was 0.93 for our set of 71 persons. The result concurred with those of other scientists.     

气相色谱法测定牙本质中天冬氨酸消旋化程度推断年龄的研究

本文应用手性毛细管柱气相色氨谱法，以酸性异丙醇、三氯乙酸酐为衍生化试剂，对不同年龄人的27颗第一磨牙牙本质中D型与L型天冬氟酸的浓度进行了测定，并计算了二者的比率，建立了消旋化程度与年龄的回归方程，r＝0．9568，SD＝4．5岁，本研究为用牙齿推断人的年龄提供了一个比较客观、准确的新手段。     

The extent of aspartic acid racemization in dentin: a possible method for a more accurate determination of age at death?

In the current study the objective was to find to what extent a reliable determination of age at death is made possible by establishing the degree of aspartic acid racemization in the dentin of teeth. The results of the investigation of 46 teeth are in agreement with the values found by other authors. The method presented makes a reproducible and accurate estimation of age possible. We intend to elaborate and improve this promising method for determination of age at death. The relevant points are presented here.