无缝线非超乳声化术联合后节灌注治疗玻璃体切除术后高度近视合并黑核白内障

目的 探讨玻璃体切除术后高度近视合并黑核白内障的手术方法和术中技巧。方法 对2016年3月-2021年11月收治的11例玻璃体切除术后高度近视合并黑核白内障,在平坦部玻璃体腔灌注下采用无缝线非超声乳化术行白内障囊外摘除及人工晶体植入术。结果 所有手术均获成功,术后矫正视力较术前矫正视力提高3行1例,提高2行4例,提高1行5例,1例黄斑病变严重者视力无变化。术中植入囊袋张力环2例,后囊膜破裂1例,术后角膜水肿7例,2-3天后逐步消退。结论 在玻璃体腔灌注下采用无缝线非超声乳化术治疗玻璃体切除术后高度近视合并黑核白内障安全有效,注意细节操作是手术成功的关键。

手法小切口白内障手术摘除黑核白内障的评估

【目的】评估对黑核白内障患者行手法小切口白内障摘除术(MSICS)的安全性和视力预后。【方法】对31名黑核白内障患者,实行手法小切口白术内障摘除术,并对晶状体核的大小进行测量。术后进行随访。【结果】31名黑核白内障患者31只眼行MSICS术。术后长期随访17人。31名患者的平均年龄为67.2(S=9.5)岁(范围49～85岁),其中女性占63.8%,术后长期随诊患者复查时间中位数为11个月(4～21个月)。术后第1天,UCVA≥0.30者70.96%。17名患者术后复查有16例(94.12%)BCVA≥0.3。有5例被发现于切口处轻度角膜水肿,前房反应轻微。没发现术后渗漏、浅前房及前房出血病例。以钢尺测量娩出后的晶状体核,其直径中位数为8.7mm(范围8.1～9.5mm)。以患者对侧未手术眼做对照,黑核组角膜散光为1.27m-1高于对照组角膜散光为0.78m-1(P﹤0.05)。【结论】手法小切口白内障摘除术用于治疗黑核白内障是安全有效的。

闪光视网膜电图对黑核白内障术后效果的评价

目的:研究闪光视网膜电图对黑核白内障术后效果的预测意义。方法:对21例28眼黑核白内障施行现代囊外及人工晶体植入术,术前常规行闪光视网膜电图检测,检测结果为:ERG各波形未引出或最大反应引出低平波。结果:白内障术后随访三个月至两年,矫正视力低于0.1者2眼,0.1至0.5者17眼,0.6至1.0者9眼。结论:闪光视网膜电图虽可做为视网膜功能评价的客观指标,可预测白内障术后效果,但该项检查受多种因素的影响,在黑核白内障病人闪光视网膜电图波形可能极差,然而白内障术后却获得了良好的视力,所以该检查不能作为对视网膜功能的唯一评价指标,要结合临床及其它检查结果综合分析,增强黑核白内障病人接受手术的信心。

美军全球信息栅格黑核加密技术发展研究

全球信息栅格(GIG)是美军目前最庞大的一项信息基础设施,是美军实现网络中心战,完成军事革命的重要推动器。GIG是各种组织机构和军兵种构建的网络之网络,这些网络相互之间如何实现保密通信是美军一直在探索的问题。黑核加密技术是美军发展全球信息栅格(GIG)所必需的13种关键技术之一,它对美军实现GIG信息保证具有十分重要的意义,为此,美军开展了积极且深入的研究。文中概述了美军GIG黑核技术的研究背景、发展现状及面临的挑战,最后提出了一些思考。

黑胸大蠊浓核症病毒对雌成虫生殖的亚致死影响

用黑胸大蠊浓核症病毒(Periplaneta fuliginosa densonucleosis virus,PfDNV)三种浓度处理黑胸大蠊8-9龄雌性若虫,对雌成虫生殖有亚致死影响。试验结果表明,雌成虫寿命分别平均减少121d、145d和179d;产卵期分别平均缩短62d、56d和121d;每雌成虫产卵鞘数分别平均减少16个(占57％)、20个(占72％)和25个(占88％),每雌成虫产卵数分别平均减少354粒(占55％)、453粒(占71％)和558粒(占86％);生殖力分别平均下降177倍(占55％)、226倍(占71％)和279倍(占88％)。卵鞘活力分别下降28％、28％和20％。雌成虫在产卵盛期的前4个月持续受到DNV的影响,每雌每月平均产卵数分别减少30粒(占40％)、69粒(占48％)、63粒(占47％)和55粒(占50％),生殖力分别下降15倍、34倍、31倍和28倍。

黑胸大蠊浓核症病毒(P_fDNV)的研究——Ⅲ 最佳感染液回感效果测定

本气报道:从已制备的11种黑胸大蠊浓核症病毒(P_fDNV)感染液中,测定出最佳感染液为第一次分离出的上清液,其LT_(50)比其它感染均短,仅44天;死亡率高达97.92％。

黑榄核破壳机械装置的设计与研究

文章针对黑榄核,仁需求量大但获取效率低的问题,采用自动化流水线代替传统人工开榄核,全自动地完成破壳以及核、仁的筛分。整体生产线大致工作流程为:榄核的定向排列、尺寸筛分、运输、切割、破壳以及核、仁的筛分。在流水线设计时主要采用了振动盘、直线送料器、链轮运输机、气动压具以及直线筛料机等机构。另外,针对榄核的不规则性,设计了3个加工尺寸的模具。后期通过有限元分析校核,证明设计机构均合理。

探究高分辨率核磁黑血成像技术评估颅内静脉及静脉窦血栓形成病程分期的价值

目的:探讨高分辨率核磁黑血成像技术评估颅内静脉及静脉窦血栓形成病程分期的价值。方法:选取颅内静脉及静脉窦血栓患者74例,全部患者均接受高分辨率核磁黑血成像技术检查,按照临床症状发生和核磁黑血成像检查时间,分为慢性组(>15d)和急性组(≤14d),慢性组28例,急性组46例。比较两组血栓信号差异。根据磁共振静脉成像检查结果对血管节段水平核磁黑血成像诊断的准确性。结果:急性组血栓信号噪声比及对比噪声比均高于慢性组,差异具有统计学意义(P<0.05);全部患者中磁共振静脉成像检查共发现318处血栓,高分辨率核磁黑血成像技术准确识别304处,在704处排除血栓,诊断敏感度为95.6%(304/318),特异度为98.0%(704/718)。结论:高分辨率核磁黑血成像技术可对颅内静脉及静脉窦急性和慢性血栓进行有效区分。

空心高斯涡旋光束的远场特性

基于角谱法和稳相法,推导出了空心高斯涡旋光束的TE波和TM波在自由空间远场传输和能流密度的解析表达式,研究了其相位奇点和能流密度分布。结果表明,空心高斯涡旋光束的远场特性主要跟控制参数有关。改变光束中的涡旋离轴量,光涡旋和能流密度黑核会发生移动。圆刃型位错线的半径和能流密度暗环位置跟束腰宽度有关,而能流密度的对称性主要受涡旋离轴量的影响。

高能核-核碰撞的靶核黑碎片发射

本文提出了高能核-核碰撞中靶核旁观体接触层的摩擦蒸发机制,计算给出了靶核黑碎片的多重数、方位角、空间角、横动量、动量和动能的分布规律,并与200GeV/N^(16)O与核乳胶相互作用的有关实验结果作了比较.

Karyotype Analysis of Lycium ruthenicum Murr.

Karyotype analysis of Lycium ruthenicum Murr. was carried out in this study. The results showed that the chromosome number was 2n=2x=24; the arm index was 48; the ratio of the longest chromosome to the shortest one was 1.31; the proportions of chromosomes with arm ratio higher than 2 was 0.08; the asymmetry index was 57.02; the karyotype type was 2A; and the karyotype formula was 2n=-24=20m＋4sm.

探讨常规制片中空气结晶及处理方法

封片程序是常规制片过程中的收关环节,日常工作中发现切片必须湿封,用温箱烤干或电吹风吹干后干燥切片,易引起细胞收缩、龟裂或切片出现黑色结晶样小点[1],切片频繁出现空气结晶,在镜下见类似色素样的点状缩晶和黑色光滑的细胞核[2],导致细胞核内细微结构无法观察,严重影响病理诊断。

Research on the Karyotype and Evolution of Drosophila melanogaster Species Group

Mitotic metaphase chromosomes of 34 species of Drosophila melanogaster species group were examined. Certain new karyotypes were described for the first time, and their evolutionary and interspecific genetic relationships among 8 subgroups of D. melanogaster species group were analyzed systematically. The results were as follows. The basic karyotype of elegans subgroup was type A. The karyotypes of eugracilis subgroup, melanogaster subgroup, and ficusphila subgroup were all type C. The karyotypes of takahashii subgroup and suzukii subgroup were both type C and type D. The montium subgroup had six kinds of karyotypes types B, C, C＇, D, D＇, and E. The ananassae subgroup had three kinds of karyotypes： types F, G, and H. Thus, the melanogaster species group was classified into five pedigrees based on the diversity of these karyotypes： 1） elegans; 2） eugracilis-melanogasterficusphila; 3） takkahashii-suzukii; 4） montium; 5） ananassae. The above-mentioned results in karyotypic evolution were consistent with those of DNA sequence analysis reported by Yang except for the elegans subgroup and this subgroup was considered as the ancestral subgroup. Karyotype analysis of the same drosophila from different isofemale lines indicated that the same Drosophila from different places showed karyotypic variation which might be due to different geographical environment and evolutionary degree or interaction between the two factors.

Comparative study of the chromosome karyotypes of two species of grasshoppers in Megaulacobothrus Caudell (Orthoptera: Acridoidea)

The chromosome karyotypes of Chorthippus （Megaulacobothrus） aethalinus （Zubovsky） and Ch. （M.） chinensis Tarbinsky were compared. Results show that the chromosome numbers of the two species fit 2n （♂） = 17 = 16 ＋ XO, in which three pairs of autosomal and sex chromosomes were terminal chromosomes, and the other five pairs of autosomes were metacentric chromosomes. These are diagnosis characters for Chorthippus. However, these two species can be distinguished by the different chromosome formula （CF） and the relative length （RL）. The CF in Ch. （M.） aethalinus is K （2n, ♂） = 6m ＋ 11t = 6L ＋ 6M ＋ 4S ＋ XO, whereas that of Ch. （M.） chinensis is K （2n, ♂） = 6m ＋ 11t = 6L ＋ 8M ＋ 2S ＋ XO. In addition, we also found that the relative lengths of sex chromosomes in the two species were different from each other. The sex-chromosome of Ch. （M.） aethalinus is located at the fifth position and its relative length is 8.33% whereas that of Ch. （M.） chinensis is at the eighth position and its relative length is 5.53%. These results show that significantly different genetic features exist for the two species of Chorthippus.

Optimization of Conditions for the Extraction of Melanin from Walnut Husk

[Objective] This study was conducted optimize the conditions for the ex- traction of melanin from walnut husk. [Method] Melanin was isolated from walnut husk through alkali extraction and acid precipitation, and the factors that may influ- ence the extraction efficiency： temperature, duration, NaOH concentration and solid- liquid ratio were set at different levels. [Result] The optimal conditions for the ex- traction of melanin from walhut husk were temperature of 80 ℃, extraction duration of 120 min, NaOH concentration of 70 mol/L, and solid-liquid ratio of 1：20. [Conclu- sion] The optimal conditions for the extraction of melanin from walnut husk deter- mined in the present study will provide references for the development and utiliza- tion of natural melanin.

Purification and characterization of Moschatin, a novel type Ⅰ ribosomeinactivating protein from the mature seeds of pumpkin (Cucurbita moschata), and preparation of its immunotoxin against human melanoma cells

A novel ribosome-inactivating protein designated Moschatin from the mature seeds of pumpkin (Cucurbita moschata) has been successively purified to homogeneity, using ammonium sulfate precipitation, CM-cellulose 52 column chromatography, Blue Sepharose CL-6B Affinity column chromatography and FPLC size-exclusion column chromatography. Moschatin is a type 1 RIP with a pI of 9.4 and molecular weight of~29 kD. It is a rRNA N-glycosidase and potently blocked the protein synthesis in the rabbit reticulocyte lysate with a IC_(50) of 0.26 nM. Using the anti-human melanoma McAb Ng76, a novel immunotoxin Moschatin-Ng76 was prepared successfully and it efficiently inhibited the growth of targeted melanoma cells M_(21) with a IC_(50) of 0.04 nM, 1500 times lower than that of free Moschatin. The results implied that Moschatin could be used as a new potential anticancer agent.

以咀嚼困难起病的颈内动脉夹层1例报告

颈部动脉夹层是导致青年脑卒中的重要原因之一,可自发或外伤后起病,累及颈部各个动脉血管,临床表现多样,累及颈内动脉致症状性闭塞则多表现一过性单眼黑朦、偏瘫、失语甚至意识丧失。本文报道1例以咀嚼困难起病的颈内动脉夹层患者,对其诊治过程的系列追踪,并对其发病机制、临床表现、影像学表现、治疗手段进行讨论,让我们重新复习一下颈内动脉夹层特征性的超声表现。

A New Combination and Two Varieties of Polystigmate Gomphonema (Gomphonemaceae Bacillariophyta) from Heilongjiang Province, China

The authors discribed a new polystigmate combination, Gomphonema turris Ehr. var. okamurae (Skv.) Fan et Bao.comb.nov., and two new varieties, Gomphonema turris Ehr. var. latum Fan et Wang. var. nov. and Gomphonema acuminatum var. obtusum Fan et Bao, var. nov., that were distinguished by frustule morphology under LM. The samples were collected from freshwater of Heilongjiang Province, China.

A Multi-parameter Model for Radio Dichotomy of Active Galactic Nuclei and Jets

Based on the coexistence of the Blandford-Znajek and magnetic coupling processes in black hole （BH） accretion disc, a multi-parameter model for jet powers and radio loudnees of active galactic nuclei （AGNs） is studied. It turns out that radio-loudnees of AGNs couM be governed by five parameters： （i） the BH spin, （ii） a power-law index of the variation of the magnetic field on the disc; （iii） a parameter determining the position of the inner edge of the disc, （iv） the ratio of the pressure of the magnetic field on the horizon to the ram pressure of the innermost parts of an accretion flow, and （v） the ratio of the angular velocity of the open field lines to that of the horizon. The observed dichotomy between radio-loud and radio-quiet AGNs is well interpreted by the effects of the above parameters. Furthermore, we discuss the derivative of radio loudness of AGNs with respect to each parameter separately. In addition, the effect of the screw instability on radio loudness of AGNs is discussed.