Response of murine spermatocytes to the metaphase-arresting effect of several mitotic arrestants

Three mitotic arrestants, colchicine, Colcemid and vinblastine, were evaluated for their effects on producing meiotic arrest in the laboratory mouse. Colchicine is the most effective and its effect is both dose- and time-dependent. Treatment of mice with 40 mg/kg of colchicine for 3 h resulted in drastic improvement of the yield and quality of M-II figures. This treatment did not appear to increase the aneuploidy frequency in M-II's.     

工业和环境流体力学中的振荡流

通过对多孔介质、湍射流的振荡流等研究的叙述，说明尽管流动现象是很复杂的，但振荡流在工业与环境流体力学中具有广泛的应用．借助先进的计算机技术和实验技术，对于振荡流的了解将会得到进一步的深入．     

Pentoxifylline attenuates acute lung injury induced by microemboli

Pentoxifylline (PTX), a methylxanthine derivative, effectively prevents acute lung injury in different animal models. To investigate whether PTX would attenuate acute lung injury induced by microemboli resulting from treatment with calcium chloride (CaCl₂) suspension, an isolated blood-perfused rat lung model was used. Pretreatment with PTX prevented the increase in pulmonary arterial pressure (PAP), lung weight gain and protein concentration in the lavage fluid after CaCl₂ treatment.     

Characterization and relative abundance of maxi-chloride channels in Epstein-Barr virus (EBV) producer: B95-8 cells

Several Epstein-Barr virus (EBV)-transformed cell lines were used to investigate the pathogenesis of lymphoproliferative diseases and nasopharyngeal carcinoma. The studies focus on the events occurring inside the membrane. On only one occasion, the cell membrane of EBV-transformed B lymphocytes from a cystic fibrosis patient was found to express defective Cl channels (CFTR; Cystic Fibrosis Transmembrane conductance Regulator), as in the airway epithelial cell. No other type of channel in EBV-transformed cells has so far been investigated. In this study, the cell membrane of the B95-8 cell was examined by the patch-clamp technique and compared to the non-EBV-infected BJAB cell. The high conductance (300 pS) maxi-chloride (Cl) channel activity was the most frequently observed event in inside-out configurations. Under similar experimental conditions, we have found a significantly higher probability of detecting maxi-Cl channel activity on the cell membrane of B95-8 cells (69%) than on BJAB cells (27%), or as previously reported on resting murine B lymphocytes (38%) or intact human T lymphocytes (37%). The relative abundance of the maxi-Cl channel on B95-8 cells may be linked to EBV infection and/or secretory ability.     

Relationship Between Measured Friction Coefficients and Two Tread Groove Design Parameters for Footwear Pads

Introduction Slips and falls are common phenomena both in work- places and leisure activities. The coefficient of fric- tion (COF) between footwear and the floor is regarded as the most critical item determining the occurrence of a slip. It is commonly ac…     

Fe,Mn—Si—Cr合金中γ→ε马氏体相变及其逆相变的内耗特征

用静电音频内耗仪测试了Ｆｅ－Ｍｎ－Ｓｉ－Ｃｒ形状记忆合金在－１００￣３００℃温度范围内耗及模量变化,研究了γ→ε马氏体相变及其逆相变的内耗特征。结果表明,γ→ε马氏体相变及其逆相变具有不同的机制,在相变过程中未出现软模现象,可见该合金的层错形核可能无需点阵软化。相变过程中的模量变化归因子于ε相模量高于γ相的模量。     

Fe—Mn—Si合金中层错几率和淬火空位对ε马氏体相变温度的影响

用Ｘ衍射线形分析法测定了Ｆｅ－３０．３％Ｍｎ－６．１％Ｓｉ（质量分数）形状记忆合金经不同温度淬火和经退火后的层错几率Ｐｓｆ．研究了淬火空位、层错几率与马氏体相变点Ｍｓ的关系．结果表明,增加淬火空位将促进层错的形成,使Ｍｓ提高;且Ｍｓ与１／Ｐｓｆ呈线性关系．对可能的机理进行了讨论．     

用间羧基偶氮氯膦─树脂相分光光度法测定钪

本文研究了间羧基偶氮氯膦（ＣＰＡｍＫ）在树脂相中与钪的显色条件。在盐酸介质中，以阴离子交换树脂吸附Ｓｃ－ＣＰＡｍＫ络阴离子。钪与试剂在０．０６ｍｏｌ／Ｌ盐酸介质中生成１：２的螯合物，在波长６７５ｎｍ处有最大吸收，表观摩尔吸光系数ε＝１４０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。在５０ｍｌ溶液中，１－７μｇＳｃ／５０ｍｌ符合比耳定律，应用于合金中钪的直接测定，结果良好。     

Value of video-assisted thoracoscopic surgery in the diagnosis and treatment of pulmonary tuberculoma: 53 cases analysis and review of literature

Tuberculoma of the lung is one of manifestations in tuberculosis and usually presents as a solitary pulmonary nodule (SPN). It is difficult to differentiate tuberculoma from SPN by other benign or malignant diseases. At present, the crucial role of video-assisted thoracoscopic surgery (VATS) in diagnosis and treatment of pulmonary diseases has been well acknowledged. Here, we reported 53 patients undergoing VATS resection for tuberculomas in our series. No postoperative mortality was found and only two patients experienced prolonged air-leakage (>7 d) and two had minor wound infections that were recovered after anti-tuberculosis or antibiotic treatment. Anti-tuberculosis chemotherapy from 6 to 12 months was routinely used postoperatively. We conclude that VATS is a satisfactory tool for the diagnosis and treatment of tuberculoma and can also establish a reliable diagnosis for all patients with SPNs.