共查询到20条相似文献,搜索用时 22 毫秒
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Lan Barnes 《The Physician and sportsmedicine》2013,41(4):211-214
Fifty years worth of data and dozens of doctoral students later, Franklin M. Henry remembers his early vision of physical education and how the field evolved into a modern academic discipline. 相似文献
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目的 利用真核毕赤酵母高效表达原核的耐辐射奇球菌pprI基因,建立高效表达及纯化PprI蛋白质的技术路线。方法 根据毕赤酵母密码子的偏爱性,改造耐辐射奇球菌pprI基因的编码序列,利用PCR技术全合成改造过的pprI基因,并在其N末端添加一个6×His标签。PCR产物经纯化后克隆到毕赤酵母表达载体pHBM-905A中,利用Cop I和Not I双酶切并回收线性化的目的片段后,转化毕赤酵母GS115菌株。将获得的毕赤酵母转化子诱导表达,SDS-PAGE、Western blot和质谱检测培养上清液,用Ni-NTA柱纯化目的蛋白,BCA法测定蛋白浓度。结果 新合成的耐辐射奇球菌pprI基因编码序列正确,毕赤酵母转化菌株的培养上清液经SDS-PAGE和Western blot均可检测到相对分子质量为43000的目的蛋白条带,经质谱检测证实该目的蛋白为耐辐射奇球菌PprI蛋白。选用Ni-NTA柱获得了大量纯化的PprI蛋白,应用浓度为250 mmol/L的咪唑淋洗时,PprI蛋白洗脱率最高。BCA法测得纯化蛋白浓度为0.35 mg/ml。结论 建立了一种新的适于毕赤酵母表达的耐辐射奇球菌pprI基因,成功构建了分泌表达PprI蛋白质的重组毕赤酵母工程菌株,建立了高效表达目的蛋白的技术路线,并获得了高效表达和纯化的PprI蛋白。 相似文献
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Brian Moffit Murray Reicher Robert Lufkin John Bentson 《Computerized medical imaging and graphics》1988,12(5)
In order to develop an optimal routine magnetic resonance (MR) spine scanning protocol, we have compared the relative efficacy of performing T1- and T2-weighted images in patients with various disorders of the lumbar region. Forty cases were randomly selected from studies performed from 1984 to 1987 and the TI- and T2-weighted images of each case were separated and interpreted blindly and independently by two neuroradiologists.Our results indicate no significant difference between T1- and T2-weighted images in the depiction of disc protrusion. The T2-weighted images were superior in depicting disc dessication, but the clinical significance of identifying a dessication disc remains uncertain. No significant difference in the depiction of osteophytes was seen between T1- and T2-weighted images. Cases of tethered cord, metastatic disease, and arachnoiditis were better delineated with T1-weighted images. The increase in signal of cerebrospinal fluid (CSF) with T2-weighting often obscured lesions within the spinal canal. In a signal case of postoperative diskitis, the T2-weighted images disclosed disc space abnormalities and epidural fluid collections not appreciated on T1 -weighted images. The T1-weighted images, however, did show thecal sac and adjacent epidural extension more clearly. In cases of metastatic disease, increase in the signal of metastases with T2 weighting often rendered them isointense to surrounding medullary bone.Given the lack of superiority of T2-weighted images over T1-weighted images in evaluating intervertebral disc protrusions and the superiority of T1-weighted images in depicting nearly all other abnormalities observed in this series, we no longer acquire T2-weighted images of the lumbar spine on a routine basis. In selected cases, such as evaluation of infected diskitis, T2-weighted imaging may have additional value. 相似文献
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目的 分析国内外关于耐辐射异常球菌(DR)的研究现状,明确前沿与热点问题,初步评析其发展前景,为进一步的研究提供信息和方向。 方法 以Web of Science和中国知网数据库为文献来源,检索2009至2018年主题词为“耐辐射异常球菌”、“耐辐射奇球菌”、“Deinococcus radiodurans”的相关文献,根据发文量、发文期刊、作者信息、关键词以及国家等进行文献计量分析,同时通过国内外文献可视化分析的权威工具CiteSpace V.5.5软件对以上信息进行多元、分时、动态地分析,探索它们之间的关系,分析其研究的发展态势、热点及前沿领域等。 结果 共纳入1026篇英文文献和157篇中文文献。英文文献数量近十年呈持平递减趋势;中文文献数量则呈波动变化,其引证文献却呈上升的趋势。英文发文量最多的作者是HUA YJ(华跃进)(48篇),中文发文量最多的作者是陈明(14篇)。国外主要发文期刊是美国的Plos One和Journal of Biological Chemistry,国内的则是《核农学报》;进行这些研究的机构主要是大学和原子能研究中心,发文量前3的国家为美国、中国和法国;研究热点主要围绕DR的抗性基因,具体研究方向较分散。 结论 DR的研究主要集中在其抗性基因,因此其耐辐射的机制今后依然是一个研究热点,且其在医学治疗、农业和环境治理等方面的应用研究具有很大的探索空间。 相似文献
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目的 建立变态反应性接触性皮炎(allergic contact dermatitis,ACD)体内外模型。方法 采用二硝基氟苯(2,4-dinitrofluorobenzene,DNFB)建立小鼠耳廓ACD模型,计算耳肿胀度、HE染色;离体培养ACD小鼠T淋巴细胞,MTT法分析细胞增殖活性,免疫荧光检测CD4的表达水平,双抗体夹心ELISA法检测细胞因子IL-2和IL-4的含量。结果 小鼠ACD模型耳可见明显肿胀、大量炎性反应细胞浸润;模型小鼠T淋巴细胞体外培养能维持一定时程的高反应性及CD4的高水平表达,IL-2的峰值显著高于IL-4峰值。结论 成功建立了简单、快速、可靠的体内外ACD模型,可为评估变应原对人类健康的风险及筛选抗ACD免疫调节新药积累实验依据。 相似文献
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《Clinical radiology》2019,74(12):972.e1-972.e8
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