重组人骨形态发生蛋白-2/7融合基因的构建及其在大肠杆菌中的表达和初步活性测定

构建重组人骨形态发生蛋白－２／７融合体, 研究其在大肠杆菌中的表达及生物学活性。利用ＤＮＡ 重组技术,将编码人骨形态发生蛋白－２ （ＢＭＰ－２） 成熟肽的０．３６ ｋｂ 基因片段与编码人骨形态发生蛋白－７ （ＢＭＰ－７） 成熟肽的０．４４ｋｂ 基因片段连接,得到重组人骨形态发生蛋白－２／７ 融合基因; 经测序鉴定后,将其克隆到表达载体ｐＢＶ２２２中,转化大肠杆菌ＤＨ５α, 温度诱导表达。表达蛋白经初步纯化后测定其对培养小鼠成骨样细胞增殖、分化及碱性磷酸酶活性的影响。克隆质粒转化的工程菌,经４２℃诱导４～６ ｈ 后,高效表达重组人骨形态发生蛋白－２／７, 在ＳＤＳ－ＰＡＧＥ上出现一新的蛋白带, 分子量约２９ ｋｕ,约占菌体总蛋白的２０％ ,表达蛋白以包涵体的形式存在,经初步纯化、裂解、复性后的ＢＭＰ－２／７ 蛋白具有促进成骨样细胞分化、增殖及增加碱性磷酸酶活性的作用。ＢＭＰ－２／７ 融合基因的构建和表达,可能提供一种全新的具有诱导成骨作用的蛋白     

骶后孔解剖学测量及临床意义

目的：通过对骶后孔位置的研究,进一步解决在针炙临床中对八穴定位不准的问题。方法：用游标卡尺对骶后孔的纵、横径及骶后孔间径进行测量,并作统计学处理。结果：测算出100例骶骨（男性54例,女性46例）骶后孔纵、横径和骶后孔中心距后正中线间横径及骶后孔中心间纵径的数值。并结合这些数值,提出比较准确的八穴的定位方法。结论：骶后孔中心距后正中线间横径及骶后孔中心间纵径对八穴的准确定位具有重要指导作用。此外,骶尾椎和腰椎骶化变异对八穴取穴也有一定影响。     

Primary spinal column sarcomas

Summary Five cases of primary spinal column sarcomas are presented. Sarcomas primarily originating from paravertebral soft tissues were excluded. Patients' age ranged from 1 to 14 years (mean 8.4 years). The male: female ratio was 23. Two patients had Ewing's sarcoma (ES) originating from L5-S1 and L4-5 pedicles, respectively; two patients had mesenchymal chondrosarcoma (MCS) originating from L1-2 pedicles and L5 body, respectively; and one patient had osteogenic sarcoma (OS) of C4 body. All patients clinically presented with pain and progressive weakness of the extremities. The time that elapsed between the onset of symptoms and diagnoses ranged from one to five months. All cases were treated with chemotherapy, radiotherapy and subtotal tumour resection with spinal canal decompression. Two cases received posterior spinal fusion operations. Three patients were alive 10 to 98 months following diagnosis. Only the case with ES of L5-S1 pedicles was in complete remission and off therapy at the 98th postoperative month. The two MCS cases were in partial remission, and were receiving chemoterapy at the time of analysis. These tumours caused similar clinical findings and prognoses, and required combined treatment, which consisted of surgery, radiotherapy and chemotherapy; histologically three different types of malignant tumours are presented in the same category. We preferred surgical decompression and stabilization procedures especially for neurologically symptomatic patients, even if they had extensive tumours with high grades. By spinal canal decompression and stabilisation, we did not intend to cure the disease; however, we intended to provide neurological improvement, spinal stabilisation, improved quality of life, early mobilisation of the patient, and cytoreduction by means of surgical tumour ablation, which could render the chemotherapy more effective.     

Agenesis of the vermis with fusion of the cerebellar hemispheres,septo-optic dysplasia and associated anomalies

Summary Agenesis of the cerebellar vermis with fusion of the dentate nuclei and cerebellar hemispheres (rhombencephalosynapsis) is a rare cerebral malformation. We report the case of a 7-h-old girl whose mother had taken the drug phencyclidine during the first 6 weeks of pregnancy. Absence of the septum pellucidum, hypoplasia of the commissural system, optic nerves, chiasm and tracts, moderate hydrocephalus, and agenesis of the posterior lobe of the pituitary were also found. Extracranial congenital anomalies involved the cardiovascular, respiratory, urinary, and musculoskeletal systems. Death was secondary to severe respiratory distress and bradycardia. The literature concerning this rare form of cerebellar malformation is reviewed.     

What is normal binocular vision?

The vergence position of the eyes is determined by the near fixation-accommodationmiosis synkinesis and the fusion mechanism. The contribution of both systems was analysed in 30 normal subjects and 16 subjects with abnormal binocular vision. Prism fixation disparity curves were determined in three different experimental situations: the routine method according to Ogle, a method to stimulate the synkinetic convergence (Experiment I, with one fixation point as sole binocular stimulus) and a method to stimulate the fusion mechanism (Experiment II, with random dot stereograms). Experiment I produced flat curves and Experiment II steep curves. The mean diameter of the horizontal Panum area was 5 minutes of arc in Experiment I and 2 in Experiment II. On the basis of these findings, it was postulated that the synkinetic system operates in the absence of fixation disparity and the fusion system in the presence of fixation disparity. In Experiment II, esodisparities of 100 minutes of arc occur in a number of normal subjects.The dividing line between normal and abnormal binocular vision therefore is blurred. Normal persons can display disparities, the order of magnitude of which is equal to that of the angle of squint in micro-strabismus.     

应用原生质体融合法选育林可霉素高产菌株

将林可霉素产生菌N65—2^#、S78—1^#的原生质体分别热灭活和紫外灭活，并将灭活原生质体用PEG融合，从中获得92-201^#融合株，其摇瓶效价分别较N65—2^#、S78—1^#提高17％、52％，且色素分泌少，传代稳定性强。     

病灶清除椎间植骨治疗胸腰椎结核15例报告

目的 观察病灶清除椎间植骨治疗胸腰椎结核的疗效。方法 全组15例，病灶涉及2节椎体10例，3节椎体5例。术前后凸畸形成角13℃～45℃，平均30℃。手术采用瘸灶清除椎体间植骨融合，使用自体肋骨5例，髂骨10例。植骨加前路钢板固定2例。结果 平均随访4年，优良率92％，植骨融合率97％。术后后凸畸形成角5℃～20℃，平均14℃。结论 胸腰椎结核病灶清除椎间植骨融合，能恢复脊柱的稳定性，骨融合率高，可纠正脊柱后凸畸形，减少晚期腰背痛的发生。     

钛钢螺纹椎体融合器治疗退行性腰椎间盘突出症的远期疗效观察

目的　观察钛钢螺纹椎体融合器 (TFC)手术治疗退行性腰椎间盘突出症的远期疗效。方法　选择 36例腰椎间盘突出症患者 ,随机分为 2组各 18例 ,治疗组采用TFC手术治疗 ,对照组采用单纯椎板开窗、髓核摘除术治疗。治疗后进行融合率、椎间隙高度、椎间孔高度观测和主、客观疗效评价。结果　治疗组椎体融合率达 94 % ,术后椎间隙高度及椎间孔高度增加 ,远期随访无明显丢失 ,临床疗效主客观评估均优于对照组。结论　TFC治疗退行性腰椎间盘突出症 ,可以有效地撑开或保持受累椎间隙 ,扩大椎间孔 ,有利于骨融合 ,可缓解疼痛 ,其远期疗效可靠。     

基于小波变换极大模的多模医学图像融合

多模态医学图像融合由于其对医学临床诊断的意义已引起广泛的关注,基于图像边缘特性的融合方法逐渐成为研究的重点。本文提出了一种基于离散二进小波变换的多尺度边缘检测和图像融合的方法,实现了特征级图像融合。不同于以往的从极大模值点直接重建图像,本文的算法利用极大模值点建立有效的融合规则,然后从融合的小波系数重构信号。融合图像的交互信息和峰值信噪比等检测指标表明此方法优于传统融合算法。