玻璃体切除术治疗眼后段异物的临床报告

目的观察玻璃体切除术治疗眼后段异物的临床效果。方法对37例(37只眼)眼后段异物患者进行玻璃体切除术治疗。结果所有病例的眼后段异物均一次性取出,成功率为100%。出院时视力≥0.1者23只眼,继发性青光眼1只眼,继发性眼内出血1只眼,无角膜失代偿及其他并发症。结论玻璃体切除术治疗眼后段异物取出成功率高,并能同时处理其它合并症,是治疗眼后段异物的理想方法。     

武汉地区正常汉族人载脂蛋白B基因区域DNA多态频率的研究

应用载脂蛋白Ｂ（ＡｐｏＢ）ｃＤＮＡ探针（ＬＢ１．５），检测了２１名武汉地区正常汉族人血脂个体的ＡｐｏＢ基因限制性内切酶ＭｓｐⅠ限制性片断长度多态性（ＲＦＬＰ）等位基因频率。结果显示：２１份标本共出现２．３５ｋｂ（Ｍ_１）和２．６０ｋｂ（Ｍ_２）２条杂交片段；突变型等位基因Ｍ_２位于ＡｐｏＢ基因３’端侧翼的高变区（ＨＶＲ）内，其基因频率为０．０２４，并具有种族差异。Ｍ_２基因的检出和基因频率的获得，为进一步揭示ＡｐｏＢ基因区域在脂类代谢中的作用提供了一个很好的遗传标记。     

肝豆状核变性基因连锁图谱的研究

为寻找适于中国人Ｗｉｌｓｏｎ氏病（ＷＤ）基因连锁分析的遗传标记及制定ＷＤ基因所在区域的遗传图谱，我们应用Ｄ１３ｑ１４－２１区域４个ＤＮＡ标记对７５名无亲缘关系个体及９个ＷＤ家系成品进行连锁分析。结果发现４个ＤＮＡ标记中３个标记等位片段与白种人相同而杂合率相异，其中２个ＤＮＡ标记Ｄ１３Ｓ３１，Ｐ１２３Ｍ１．８与ＷＤ基因存在紧密连锁关系。其遗传顺序为：着丝点－Ｒｂ－Ｄ１３Ｓ３１－ＷＮＤ。     

银川市老年人空腹血糖受损与心电图ST段压低的相关性研究

目的：研究宁夏银川市老年人空腹血糖受损与心电图ST段压低的相关性。方法对城市社区958例60岁以上老年人通过调查问卷的方式收集信息和进行临床检查,内容包括询问病史、测量身高、体质量、心电图,实验室检查内容包括空腹血糖（FPG）、甘油三酯（TG）、总胆固醇（TC）、高密度脂蛋白（HDL－C）、低密度脂蛋白胆固醇（ LDL－C）,对空腹血糖受损与心电图ST段压低的相关性进行分析。结果958例受检人群中,血糖正常788例,其中ST段压低40例,占5％（40／788）;空腹血糖受损者有170例,其中ST段压低者有29例,占17％（29／170）,差异有统计学意义（P＜0?05）。空腹血糖受损组血脂代谢紊乱明显,与血糖正常人群比较 TC、TG、LDL－C明显升高（P＜0?05）,HDL－C低于正常水平（P＜0?05）,肥胖（体质量指数）增高人数于正常血糖组（P＜0?05）。吸烟与空腹血糖受损差异无统计学意义。结论空腹血糖受损组心电图ST压低发生率明显高于正常血糖组,与糖代谢异常和脂代谢异常、冠状动脉粥样硬化有关。     

Comparison of Melting Processes for WPC and the Resulting Differences in Thermal Damage,Emissions and Mechanics

The necessity for resource-efficient manufacturing technologies requires new developments within the field of plastic processing. Lightweight design using wood fibers as sustainable reinforcement for thermoplastics might be one solution. The processing of wood fibers requires special attention to the applied thermal load. Even at low processing temperatures, the influence of the dwell time, temperature and shear force is critical to ensure the structural integrity of fibers. Therefore, this article compares different compounding rates for polypropylene with wood fibers and highlights their effects on the olfactory, visual and mechanical properties of the injection-molded part. The study compares one-step processing, using an injection-molding compounder (IMC), with two-step processing, using a twin-scew-extruder (TSE), a heating/cooling mixer (HCM) and an internal mixer (IM) with subsequent injection molding. Although the highest fiber length was achieved by using the IMC, the best mechanical properties were achieved by the HCM and IM. The measured oxidation induction time and volatile organic compound content indicate that the lowest amount of thermal damage occurred when using the HCM and IM. The advantage of one-time melting was evened out by the dwell time. The reinforcement of thermoplastics by wood fibers depends more strongly on the structural integrity of the fibers compared to their length and homogeneity.     

Determination of the Tool–Chip Contact Length for the Cutting Processes

The thermomechanical interaction of the tool with the chip in the most loaded secondary cutting zone depends on the contact length of the tool rake face with the chip. Experimental studies of the dependency of the contact length on the cutting speed, the undeformed chip thickness, and the tool rake angle, performed by the optical method, are used for comparison with the contact length obtained by the FE modeling of the orthogonal cutting process. To determine the parameters of the constitutive Johnson–Cook equation, which serves as a material model of the FE cutting model that has a predominant influence on the contact length, a software-implemented algorithm was developed. This algorithm is based on determining the generalized parameters of the constitutive equation through finding the intersection of these parameter sets. The plurality intersection of the parameter sets of the constitutive equation is determined by means of the design of experiments and refined by subsequent multiple iterations. The comparison of the contact length values, obtained by simulating the cutting process using the generalized parameters of the constitutive equation as a material model with their experimental values, does not exceed 12% for a wide range of cutting speeds and depths of cut, as well as for the tool rake angle.     

新疆维吾尔族青年足长与身高的关系

本文对1988年测量的609名(男296,女313,年龄18～24岁)新疆维吾尔族青年学生足长、身高,按年龄、性别分组,计算了足长和身高的均值、身高与足长的比值,并提出了由足长推算身高的简单公式和回归方程。     

YUYI无毛小鼠生长特性的初步研究

本中心建立的YuYi无毛小鼠封闭群是国内唯一的无毛鼠群体,与昆明小鼠相比,其生长发育相对迟缓,寿命较短(1.5年)。性成熟期为6—7周龄。初生体重:雄性1.9±0.29g,雌性1.39±1.03g。10周龄雄性体长7.5cm,雌性7.63cm,雄性尾长9.35cm,雌性尾长8.98cm。雄鼠最大体重在8同龄为32±1.414g,以后体重有所下降。雌鼠10同龄体重为29.94±4.25g,8周龄以后无毛鼠皮肤出现皱纹。     

不育症患者指长波动不对称性特点的分析

目的 分析宁夏汉族男性不育症患者指长波动不对称性（FA）的特点。方法 遵循体质测量法,计算384例宁夏汉族男性（不育组192例,对照组192例）各指指长FA（2FA、3FA、4FA、5FA）及复合FA（CFA）的均值,比较各均值的差异性。结果 （1）不育组和对照组各指长FA均值分布趋势均为5FA < 3FA < 4FA < 2FA。（2）不育组各指长FA均值均高于对照组,2FA及4FA差异显著（P<0.05）,且不育组2FA与体重指数（BMI）正相关（P<0.05）;不育组2FA分布在|L-R|≥0.04中的人数显著高于对照组（P<0.05）。结论 2FA可能为男性不育的早期筛查提供重要的参考信息。     

伤椎置钉短节段内固定治疗胸腰椎爆裂骨折的效果

〔摘 要〕 目的：比较伤椎置钉与不置钉短节段内固定对胸腰椎爆裂骨折患者的效果。 方法：选取盐城市第三人民医 院 2018 年 12 月至 2020 年 10 月期间收治的 93 例胸腰椎爆裂骨折患者,按照计算机分组法分为对照组（46 例）和观察组 （47 例）。对照组给予不置钉短节段内固定治疗,观察组给予伤椎置钉短节段内固定治疗,观察两组患者围手术期指 标、固定效果以及术后并发症发生情况。 结果：两组患者手术时间、住院时间、术中出血量比较,差异均无统计学意义 （P ＞ 0.05）;术后 6 个月,观察组 Cobb''s 角、伤椎椎体楔形变角均小于对照组,差异具有统计学意义（P ＜ 0.05）;观 察组患者术后并发症发生率（2.13 %）低于对照组（17.39 %）,差异具有统计学意义（P ＜ 0.05）。 结论：伤椎置钉和不 置钉短节段内固定治疗胸腰椎爆裂骨折患者在围手术期指标情况方面相当,但与不置钉短节段内固定相比,伤椎置钉可提 高胸腰椎爆裂骨折患者固定效果,减少术后并发症。