免疫抑制剂SIPI-96-1014的分离和鉴别

在应用酵母突变体模型筛选免疫抑制过程中，筛选出一阳性菌株ＳＩＰＩ－９６－１０１４。经过发酵提取，分离和纯化，从其菌丝体中分离出一个活性化合物ＳＩＰＩ－９６－１０１４。通过对其理化性质等光谱数据的分析，确定其结构与化合物邻羟基乙酰苯胺一致。生物学活性研究表明，其对酵母野生株和突变株具有一定的抑制活性，详细的免疫抑制活性有待于进一步研究。     

Accidental ingestion of foreign object: Systematic review,recommendations and report of a case

One of the serious complications during a routine endodontic procedure is accidental ingestion/aspiration of the endodontic instruments, which can happen when proper isolation is not done. There are at present no clear guidelines whether foreign body ingestion in the gastrointestinal tract should be managed conservatively, endoscopically or surgically. A 5 year old boy reported to the Department of Pediatric and Preventive Dentistry, D.A. Pandu Memorial R.V. Dental College, Bangalore, India, with a complaint of pain and swelling in the lower right back teeth region. Endodontic therapy was planned for the affected tooth. During the course of treatment the child accidentally swallowed a 21 mm 15 size K file. Endoscopy was performed immediately but the instrument could not be retrieved. The instrument passed out uneventfully along with the stools 48 h after ingestion.Careful evaluation of the patient immediately after the accident helps in managing the patient effectively along with following the recommended guidelines.     

江苏省蜱及其携带莱姆病螺旋体初步调查

目的：了解我省莱姆病主要传播媒介蜱的种类、分布、消长及其携带莱姆病螺旋体情况。方法：在山区、林区用布旗法及动物体外捕捉法收集蜱，并进行病原体分离。结果：我省长江南北均有蜱存在，隶属１科２属４种；蜱密度有明显季节性，４月初出现，５～６月为高峰，８月逐渐下降，至１０月下旬消失；蜱研磨培养２５组５０管，３个月定期镜检，未发现莱姆病螺旋体。结论：我省蜱的莱姆病传播媒介和贮存宿主作用尚不能定论     

人外周血树突状细胞的分离与鉴定

应用细胞分层剂密度梯度离心辅以细胞贴壁和花环沉降法，分离和纯化人外周血树突状细胞，通过Ｅｔ花环形成细胞测定，荧光染色镜检和ＦＡＣＳ分析表明，分离的细胞纯度可达４０％￣６０％，残留的其他细胞多为ＮＫ细胞，单核细胞和Ｔ细胞，ＦＡＣＳ分析还显示：所分离的细胞表面ＭＨＣⅡ类抗原的阳性率达９７．３４％，扫描电镜观察可见独特的细胞形态，将此类细胞加入体外淋巴细胞增殖反应体系则呈现明显促进作用，提示：分离的细胞     

A technique for isolating heterophils from blood of orange-winged Amazon parrots (Amazona amazonica amazonica)

Blood samples from adult orange-winged Amazon parrots (Amazona amazonica amazonica) were collected to develop a rapid and efficient technique for isolating pure populations of morphologically intact and functional heterophils. In addition, normal haematological parameters for the orange-winged Amazon parrots (n=20) were established and found to be within the reported range of other Amazon species. Heterophil isolation (n=16) was maximally achieved by concentrating the white blood cells with 3% hetastarch prior to running the sample through a polysucrose and disodium diatrizoate centrifugation. The isolation procedure yielded an average heterophil recovery of 61.9%, the purity exceeded 92.6% and viability was 98.9%. Cell integrity was evaluated utilising flow cytometry, cytochemistries, and light microscopy. In this study, isolated heterophils exhibited morphological and cytochemical characteristics similar to whole blood heterophils and were phagocytically active. The results of this study demonstrate that an intact, viable and functionally active heterophil population can successfully be isolated from relatively small volumes of blood and that these cell populations can be further studied employing in vitro bioassaying techniques.     

免疫抑制剂I2190B的分离与鉴别

在筛选免疫抑制剂的过程中，找到了一株吸水类链霉菌Ｉ２１９０，属于ＦＫ－５０６类化合物的产生菌，从其发酵产物中已分离出Ａ、Ｂ二个组份，基于光谱数据和理化特性的分析，证实１２１９０Ｂ和免疫抑制剂ＦＫ－５２０及ＬＤ－６８３５９０（Ｉｍｍｕｎｏｍｙｃｉｎ）均为同一物质。     

Neurobehavioral effects of environmental enrichment and drug abuse vulnerability

Environmental enrichment during development produces a host of neurobehavioral effects in preclinical models. Early work demonstrated that enrichment enhances learning of a variety of behavioral tasks in rats and these changes are associated with neural changes in various cortical regions. In addition to promoting superior learning, more recent evidence suggests that environmental enrichment also has a protective effect in reducing drug abuse vulnerability. The current review describes some of the most important environment-dependent neural changes in reward-relevant brain structures and summarizes some of the key findings from the extensive literature showing how enrichment decreases the impact of drugs of abuse. Some critical neural mechanisms that may mediate the behavioral changes are postulated, along with some notes of caution about the limitations of the work cited.     

437例疑似登革热患者急性期血液病毒分离结果及分析

１９７８～１９９１，广东省登革热流行期间，采集疑似登革热患者急性期血标本４３７例，其中用新生小白鼠分离１４５例，阳性３０例，阳性率为２０．６８％；Ｃ６／３６细胞分离３５１例，阳性１８７例，阳性率５３．８％，。５９份血标本用配对方法检测，表明Ｃ６／３６细胞分离登革病毒敏感性高于新生小白鼠（Ｐ＜０．０１）。病毒分离结果还表明不同型别的登革病毒对新生小白鼠敏感性不同，同型不同年份分离的登革病毒株对新生小白鼠敏感性也不同。     

Occurrence of different genospecies ofBorrelia burgdorferi sensu lato in ixodid ticks of Valais,Switzerland

A total of 825 adult ticks (727Ixodes ricinus, 72Dermacentor marginatus and 26Haemaphysalis punctata) was collected from vegetation in Valais (Switzerland) in 1987 to 1992. They were examined for the presence ofBorrelia burgdorferi sensu lato, the etiologic agent of Lyme borreliosis.B. burgdorferi sensu lato was detected by indirect immunofluorescence assay, dark field microscopy and/or culture in 221 out of 727I. ricinus (30.4%) and none in the other two species. From these 221 infected ticks we obtained 50 isolates. Indirect immunofluorescence assay and culture were used for all ticks but dark field examination has also been performed and compared to the two above mentioned methods for 231I. ricinus. Indirect immunofluorescence was found the most efficient method for the detection of Borrelia in ticks with 54 positive out of 231, followed by dark field examination with 35 positive and culture with 12 isolates. We found no site free of Borrelia whereI. ricinus is present. The rate of infection varied from 9.7 to 47.5%, as detected by the addition of the three methods. Typing of the 50 isolates revealed also a nonhomogeneous distribution of the Borrelia species. Based on the electrophoretic mobility of the OspA and B and immunostaining with species specific monoclonal antibodies (H3TS forB. burgdorferi sensu stricto, D6 forB. garinii and J8.3 forB. afzelii) 4 groups could be observed. Half of the isolates (n=26) were typed asB. burgdorferi sensu stricto, 19 asB. garinii, 3 asB. afzelii and 2 as group VS116. This forth group formed of two isolates from one location is genetically distinct from the 3 former species described in Europe so far. The Borreliae of this group are unreactive with any of the three monoclonal antibodies used.     

用活性碳分离纯化苯丙氨酸的研究

从用固定化细胞生产L-苯丙氨酸的反应液中，应用颗粒活性碳分离纯化L-苯丙氨酸。结果表明，该方法不受大量的无机盐干扰，纯化的L-苯丙氨酸，回收率为70％左右，产品纯度大于99．5％。