Molecular and functional characterization of a mutant allele of the mitogen-activated protein-kinase geneSLT2(MPK1) rescued from yeast autolytic mutants

 We have further characterized the functionality of the Saccharomyces cerevisiae gene SLT2(MPK1), coding for a MAP-kinase homolog essential for cell integrity, which is involved in the Pkc1p signalling pathway. This gene was isolated on the basis of its capacity to complement the thermosensitive-autolytic, osmotic-remediable phenotype of lyt2 mutants. Both slt2Δ and lyt2 mutants displayed a caffeine-sensitive phenotype consisting of cell lysis that was not dependent on temperature. Caffeine concentrations affecting the growth of these mutant strains were dependent on the genetic background, the SSD1 allele being very significant in this regard. The SLT2 allele of several lyt2 strains was both rescued and amplified by PCR. The recovered allele was shown to be non-functional as it could not complement the lytic phenotype of both deletion (slt2Δ) and lyt2 strains. After nucleotide sequencing of the recovered allele, we found that the defect of lyt2 mutants consists in a substitution of an aspartic acid for a glycine at position 35 of the amino-acid sequence of Slt2p. Gly35 is the third glycine of a glycine cluster (Gly-X-Gly-X-X-Gly), a conserved region in protein kinases and other nucleotide-binding proteins. Received: 13 October/27 November 1995     

领导生命周期理论在提高手术室护士预防静脉血栓水平中的应用

目的:探讨领导生命周期理论在提高手术室护士预防静脉血栓(VTE)水平中的应用效果.方法:选取2019年2月—2019年12月本院手术室护士56人作为研究对象,按照随机数字表法,将护士分为观察组和对照组各28人.对照组护士采用常规培训计划进行干预,观察组护士在此基础上采用基于领导生命周期理论的培训模式进行干预.经过6个月的干预,比较两组护士干预期间所管病人VTE发生率,以及干预前后预防VTE知识问卷得分、护士工作满意度量表(MMSS)得分.结果:观察组护士所管病人VTE发生率低于对照组,差异具有统计学意义(P<0.05).两组护士VTE知识问卷得分均高于干预前,观察组护士VTE知识问卷得分、MMSS得分高于对照组,差异均具有统计学意义(P<0.05).结论:基于领导生命周期理论的培训模式有利于提高手术室护士预防VTE知识掌握程度,改善护士工作满意度,同时有效降低病人VTE发生率.     

SLT接触式激光显微手术治疗脊髓髓内肿瘤随机对照研究

目的研究应用接触式激光显微手术治疗髓内肿瘤的疗效。方法对我院1998年3月-2003年4月期间入院所有脊髓髓内肿瘤患者随机分为A组和B组。其中A组接受常规显微手术,B组接受接触式激光器配合显微手术。制定严格的纳入和排除标准。术后采用美国脊髓损伤协会ASIA评分标准评分,评分时间分别为术后3个月、6个月、12个月。采用SPSS统计软件统计分析。结果A组30例,肿瘤全切11例(36.67%);近全切除14例(46.67%),大部切除5例(16.67%)。B组25例,肿瘤全切16例(64.00%);近全切除8例(32.00%)。大部切除1例(4.00%)。对两组治疗前后ASIA评分进行统计分析,术后3个月与术前评分差异有统计学意义(P<0.001)。结论⑴接触式激光可以精确地切除和汽化髓内肿瘤,减少副损伤。⑵接触式激光器配合显微手术与单纯使用显微手术相比增加了脊髓髓内肿瘤的切除率和术后功能好转率。⑶术后6个月内脊髓功能恢复良好,6个月后病情趋于稳定。     

Anti-visceral obesity and antioxidant effects of powdered sea buckthorn (Hippophae rhamnoides L.) leaf tea in diet-induced obese mice

The potential health benefits of tea have long been studied. This study examined the role of powdered sea buckthorn leaf tea (SLT) in high-fat diet-induced obese mice. The mice were fed two different doses of SLT (1% and 5%, wt/wt) for six weeks. SLT suppressed body weight gain in a dose-dependent manner and significantly reduced visceral fat, plasma levels of leptin, triglyceride and total cholesterol and ALT activity compared with the high-fat-fed control mice. SLT also decreased hepatic triglyceride and cholesterol concentrations and lipid accumulation, whereas elevated fecal lipid excretion. High-fat feeding resulted in simultaneously decreasing hepatic FAS and G6PD activities and increasing PAP, β-oxidation and CPT activities. However, SLT supplementation during high-fat feeding led to a significant decrease in PAP, β-oxidation and CPT activities with a simultaneous increase in G6PD activity. The hepatic CYP2E1 activity and hepatic and erythrocyte lipid peroxides were significantly lowered with SLT supplements. Hepatic and erythrocyte SOD and CAT activities were also increased with SLT supplements in a dose-dependent manner, whereas GSH-Px activity was increased in erythrocytes only. These results indicate that SLT has potential anti-visceral obesity and antioxidant effects mediated by the regulation of lipid and antioxidant metabolism in high-fat diet-induced obese mice.     

选择性激光小梁成形术治疗原发性开角型青光眼的临床效果

目的探讨选择性激光小梁成形术(selective laser trabeculoplasty,SLT)治疗原发性开角型青光眼的安全性和有效性.方法对24例30眼原发性开角型青光眼患者,8例10眼原发性开角型青光眼氩激光小梁成形术(argon laser trabeculoplasty,ALT)失败患者,采用倍频Q-开关532nmNd:YAG激光治疗.所有患者上方或下方房角180度范围内进行治疗,能量0.50~1.50mJ,点数80~100点.测量术后1h眼压,术后1d;1周;1月、3月、6月;1年随访,对比术前术后眼压、最佳矫正视力、视野及杯盘比变化.结果患者术前眼压(24.35±6.12)mmHg,术后1h为(18.12±5.23)mmHg,1d为(15.62±3.61)mmHg,1周为(18.14±2.05)mmHg,1月为(16.58±3.22)mmHg,3月为(18.26±2.52)mmHg,6月为(17.02±2.31)mmHg,1年为(18.03±3.41)mmHg;术前患者杯盘比为0.58±0.20,术后1年为0.57±0.30;术前视力0.81±0.30,术后1年视力为0.83±0.41;视野术前术后无变化.结论选择性激光小梁成形术可以有效地降低原发性开角型青光眼及原发性开角型青光眼氩激光小梁成形术失败患者的眼内压.