Dynamic imaging of the lungs using x-ray phase contrast

High quality real-time imaging of lungs in vivo presents considerable challenges. We demonstrate here that phase contrast x-ray imaging is capable of dynamically imaging the lungs. It retains many of the advantages of simple x-ray imaging, whilst also being able to map weakly absorbing soft tissues based on refractive index differences. Preliminary results reported herein show that this novel imaging technique can identify and locate airway liquid and allows lung aeration in newborn rabbit pups to be dynamically visualized.     

活性氧在脊髓损伤中的作用

脊髓损伤(spinal cord injury，SCI)治疗的实验性研究在18世纪就已经开始，研究者发现兴奋性毒性、Ca2+超载、神经元凋亡与氧化应激参与了神经损伤病理过程。近期研究中活性氧学说在脊髓损伤中的作用越来越受到研究者的重视，并有研究表明线粒体呼吸链、炎症反应中的呼吸爆发等多种途径参与了SCI后活性氧生成。本文在阐述活性氧生物学作用的同时，并结合近年来以活性氧为靶点的SCI治疗策略做一小结。     

Role of angiotensin Ⅱ and JAK2 signal pathway in transdifferentation of renal tubular cells in mice after acute ischemic followed by reperfusion

Objective To investigate the effect of angiotensin (Ang) Ⅱ and its Janns-activated kinase-2 (JAK2) signal pathway in transdifferentiation of renal tubular cells under the challenge of acute ischemic reperfusion injury.Methods Models of acute ischemic reperfusion injury were established and the level of local Ang Ⅱ ,a key element of renin-angiotensin system (RAS),in kidney was measured using radioimmunity technique.The expression of α-smooth muscle actin (α-SMA),a phenotype of mesenchymal cells,was detected by RT-PCR and inununohistochemistry methods.Renal tubule cells ( NRK-52E) were cultured with various concentration of Ang Ⅱ ,followed by blocking of PD123319,Ang U receptor 2 antagonist,and AG490,an inhibitor of JAK2 signal pathway.Results Ang 0 of kidney tissue increased immediately after acute ischemic-reperfusion injury,in time dependent fashion.Expression of α-SMA in renal tubule cells was found at 48 hours after ischemic-reperfusion injury and in NRK-52E cells treated by high concentration of Ang Ⅱ and was dose and time dependent.The peak of α-SMA expression was seen after 30 minute treatment at the dose of 10-9'mol/L,which was interrupted by both of PD123319 and AG490.Conclusions Transdifferentiarion of renal tubular epithelial cells occurs under acute ischemic- reperfusion injury.Local renin-angiotensin system may play a role in the transdifferentiation of TEC through AT2 receptor and its JAK2 signal pathway.     

湖南侗族左扣手人群的手纹分析

目的　对湖南侗族左扣手人群的手纹分布特点进行研究 ,积累侗族群体遗传学与民族学资料。方法　用油墨拓印法捺印手纹 ,放大镜下观察分析。结果　侗族左扣手人的指纹分型特点是 :尺箕 >简斗 >双箕斗 >桡箕 >简弓 >帐弓 ;Ws型在各手指的出现率、掌褶纹类型的百分率、以及总指纹嵴数和a -b纹嵴线数存在明显的性差 (P <0 0 5或P <0 0 1) ;女性Ws和Lu的出现率、男性Ws和Wd在各指的分布 ,以及通贯型掌褶纹百分率与对照组存在明显差异 (P <0 0 5或P <0 0 1)。结论　湖南侗族左扣手人的斗型纹与掌褶纹的分布具有一定的特异性     

抗HPT单克隆抗体的制备与生物学特性鉴定

目的：制备抗潮霉素B磷酸转移酶(HPT)的单克隆抗体(McAb)，建立一种快速检测转基因作物中该选择标记基因HPT编码蛋白的方法。方法：用基因重组潮霉素B磷酸转移酶(HPT)抗原免疫BALB/C小鼠，采用杂交瘤技术制备McAb。选择不同的抗原决定簇与兔抗HPT多抗配对，建立双抗夹心ELISA检测HPT抗原。结果：筛选出四株稳定分泌抗HPT单抗的杂交瘤细胞株，IgG亚类鉴定均为IgG1，ELISA检测证实单抗可特异性识别细胞培养上清、重组子菌体裂解产物中及纯化出的HPT蛋白。结合位点测定实验表明4株单抗是针对不同的抗原决定簇，与多克隆抗体组成双抗夹心ELISA法，均可较好地检测到HPT抗原。检测的灵敏度为30ng／ml，且与别的无关抗原无交叉反应性。结论：4株杂交瘤细胞株特异性好，亲和力强，组成双抗夹心ELISA法可用于快速、灵敏检测HPT抗原。     

湖南侗族指纹白线正常值分析

目的 :分析侗族指纹白线的出现率 ,并探讨其相关因素。材料与方法 :用油墨拓印法印取指纹图 ,按Schouman方法确定指纹白线 ,并对获取的资料进行统计分析。结果 :(1 )湖南侗族指纹白线出现率为 3 7 2 7% ,女性明显高于男性 (P <0 .0 0 1 ) ;(2 )侗族左手指纹白线出现率明显高于右手 (P <0 .0 0 1 ) ;(3 )侗族AB血型人指纹白线出现率低于其他血型人群 (P <0 .0 5 ) ;(4 )指纹白线在各手指的出现率按中指 >环指 >示指 >拇指 >小指的顺序排列。结论 :湖南侗族指纹白线出现率高于我国其他几个民族 ,其出现率与性别、手别、指别、血型有关     

斯蒂克勒综合征5例分析

目的 探讨斯蒂克勒综合征的眼部及其他临床表现。方法 对一个家第三代５例患者进行临床分析。结果 ５例患者主要眼部表现为不同程度的近视、白内障、玻璃体变性、尖发难治的视网膜脱离。患者身材疲长,下颌稍小,无关节病和脊柱异常。结论 我勒综合征是一种罕见的以眼部症状为特征的遗传性闰病。     

Increased muscle stiffness after anterior cruciate ligament reconstruction – memory on injury?

Residual impairment of knee function was tested in 25 patients 6 to 12 months after successful unilateral reconstruction of the anterior cruciate ligament. The control group comprised 25 healthy individuals. Jumping onto one foot from a height of 20 cm was taken as a prototype of similar everyday activities. We measured maximum flexion of the knee during the landing phase of the jump, and the degree of knee flexion at the time of maximum deceleration of the knee against gravity during jumping using the three-dimensional optical motion analysis system-ELITE. In the group of patients, measured parametres were significantly smaller on the operated side than on the unaffected side. These two measured values were significantly smaller on both legs in group of patients as compared to the values in the control group. The results of our study indicate that functional disturbance persisted for 6 to 12 months after anterior cruciate reconstruction. This may be due to the changed muscle activation pattern of the knee causing increased stiffness of knee muscles. It seems that re-programming of the central nervous system occurred in order to protect the injured lower extremities from another injury.     

The axial load teardrop fracture. A biomechanical, clinical and roentgenographic analysis

The anteroinferior cervical vertebral body corner fracture was originally described by Schneider and Cann as the "teardrop" fracture. This report analyzes the biomechanical, clinical, and roentgenographic features of 55 such fractures obtained from the National Football Head and Neck Injury Registry. Teardrop fractures resulting from tackle football characteristically occurred in players attempting to make a tackle in which initial contact was made with the top or crown of the helmet. There were two fracture patterns associated with the anteroinferior corner (teardrop) fracture fragment: 1) the isolated fracture, which is usually not associated with permanent neurologic sequelae; and 2) the three-part, two-plane fracture in which there is an associated sagittal vertebral body fracture as well as fracture of the posterior neural arch. This latter pattern was almost always associated with permanent neurologic sequelae, specifically quadriplegia. Axial loading of the cervical spine was clearly identified as a mechanism of injury for both fracture patterns. Roentgenographic examination must include both anteroposterior and lateral views with computed tomography or tomography as necessary to determine the presence of the sagittal vertebral body fracture and the integrity of the posterior neural arch.