Partial purification and characterization of anhydrotetracycline oxygenase of Streptomyces aureofaciens

Anhydrotetracycline oxygenase was purified both by affinity chromatography and by hydrophobic interaction chromatography. Molecular weight of anhydrotetracycline oxygenase was determined to be 115,000 by Sephadex G-200 gel filtration. Using preparative isoelectric focusing the isoelectric point of the enzyme was estimated to be 5.3. The enzyme showed a sensitivity to thiol-specific inhibitors. During the hydrophobic interaction purification step, the activity dropped considerably. Reactivation occurred when a heat treated crude extract was added to the reaction mixture.     

The Potential of Anti-Bullying Efforts to Prevent Academic Failure and Youth Crime. A Case Using the Olweus Bullying Prevention Program (OBPP)

Prevention Science - The effectiveness of bullying prevention programs has led to expectations that these programs could have effects beyond their primary goals. By reducing the number of victims...     

Die zeitlich-räumliche Verteilung von COVID-19 in Köln und beeinflussende soziale Faktoren im Zeitraum Februar 2020 bis Oktober 2021

Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz - Schon in der frühen Phase der global sehr verschieden verlaufenden COVID-19-Pandemie zeigten sich Hinweise auf den Einfluss...     

罗哌卡因用于下腹部手术后硬膜外自控镇痛的评价

目的　评价罗哌卡因用于下腹部手术后镇痛的有效性和不良反应。方法　 6 0例择期下腹部手术患者 ,随机分为两组 ,第Ⅰ组为罗哌卡因复合PCA吗啡治疗组 ,第Ⅱ组为安慰剂复合PCA吗啡组。观察罗哌卡因镇痛效果及对运动神经阻滞的影响 ,对比两组的血液动力学变化、吗啡用量和不良反应。结果　罗哌卡因复合PCA吗啡治疗组的术后疼痛评分及不良反应明显低于安慰剂复合PCA吗啡组 ,且第Ⅰ组的吗啡用量明显低于安慰剂组。结论　 0 2 %罗哌卡因复合PCA吗啡可安全有效地应用于下腹部术后的镇痛。     

犬胸部爆炸伤后海水浸泡的实验模型建立及早期救治结果分析

目的：建立犬海水浸泡胸部爆炸伤实验模型,探讨早期救治结果。方法：20只成年杂犬随机分为爆炸伤组（n=10)和锐器伤组（n=10)。两组动物均于致伤后浸泡在人工配制的海水中25min,而后打捞出海水环境后予以紧急救治。实验中全程监血液动力学呼吸系统和动脉血气变化。结果：海水浸泡后爆炸伤组的伤情明显重于脱器伤组,经救治后两组生存时间均明显延长,但锐器伤组更为明显。结论：本胸部爆炸伤模型是可行的并且重复性好,创伤后造成的呼吸循环功能变化与临床所见相符,适用于海水浸泡胸部开放伤的早期病理生理研究。爆炸伤的伤情更为严重,除严重电解质紊乱和高渗血症外,严重的肺损伤可能是影响生存时间的重要原因之一。     

PCNA、p53及C—erbB—2在卵巢浆、液粘液性上皮瘤中的表达

目的 研究卵巢浆、粘液性上皮瘤PCNA、p53、C－erbB-2基因产物的表达与细胞增殖关系。方法 采用S－P免疫组化法对110例卵巢浆、粘液性良恶性肿瘤进行PCNA、p53及C－erbB-2的检测。结果 在30例卵巢囊腺瘤、38例交界性囊腺瘤及42例腺癌中,PCNA的阳性表达分别为16.67%、0和0;p53的阳性表达分别为57．89％、39．47％和15．79％;C-erbB-2的阳性表达分别为90．48％、73．80％和42．86％。三组相比差异有显著性（P＜0．05）。p53及C-erbB-2的表达在PCNA强阳性组大于PCNA的弱阳性组及阴性组,在浆液性肿瘤组大于粘液性肿瘤组。结论 卵巢交界性肿瘤在不同程度上具有与腺癌相似的癌基因表达,浆液性腺癌的预后比粘液性腺癌差,可能与癌基因表达阳性率有关。     

白三烯受体拮抗剂对哮喘局部免疫影响的实验研究

目的为研究白三烯(LTs)拮抗剂安可来(Accolate)对哮喘大鼠气道嗜酸性粒细胞(EOS)、淋巴细胞(Lym)浸润以及T细胞活化表达白细胞介素-2受体(IL-2R)的影响,探讨安可来治疗哮喘的作用机制.方法应用卵清蛋白腹腔注射致敏和反复超声雾化吸入激发诱喘建立大鼠哮喘模型.随机分为正常对照组(A组)、阳性对照组(B组)、预防治疗组(C组)和治疗组(D组).A组以生理盐水致敏和激发,B、C、D组建立哮喘模型.C组自激发诱喘前1周起预防性给予安可来饲喂,诱喘期继续治疗.D组自激发日起行安可来饲喂.病理切片观察大鼠支气管壁EOS、Lym浸润,ABC法检测大鼠T细胞IL-2R的表达.结果正常对照组大鼠支气管壁可见少量Lym浸润但无明显EOS浸润和炎症反应,IL-2R阳性细胞数目很少.阳性对照组支气管壁EOS、Lym浸润以及IL-2R阳性细胞数目明显增多,较正常对照组有显著差异(P＜0.01).饲喂安可来预防和(或)治疗能减少支气管壁EOS、Lym浸润以及IL-2R阳性细胞数目,与阳性对照组相比有显著差异(P＜0.05).结论安可来能减轻哮喘大鼠肺组织炎症反应,抑制EOS、Lym等炎症细胞向气道组织的浸润,对大鼠T细胞活化表达IL-2R亦有明显抑制作用.     

PCA在过程故障检测与诊断中的应用

讨论了基于主无分析（PCA）的过程故障检测与诊断的原理,运用T^2统计、Q统计方法,结合贡献图对一典型过程进行了仿真分析,结果表明PCA方法可对简单传感器故障进行检测与诊断,并指出了该方法中的不足,提出了将PCA方法同基于过程动态模型的故障诊断方法相结合的研究思路。     

二羟丙腺苷加高压氧对小鼠脑炎病毒感染的抑制作用

目的 :研究S型与RS型二羟丙腺苷 (DHPA)与高压氧联用对人工感染小白鼠体内日本乙型脑炎 (乙脑 )病毒的抑制作用。方法 :整个实验用两株不同乙脑病毒分两次进行。每次一株 ,乙脑病毒接种小白鼠后将其分组 ,接种后 4～ 6h开始治疗 ,连续 5d ,于开始治疗后第二周末结束实验 ,计算每组小鼠死亡与存活数。结果 :对照组与 (S) DHPA/高压氧联合治疗组及 (RS) DHPA/高压氧联合治疗组效果差异有高度显著性 (P分别 <0 .0 2 5及 <0 .0 1) ,对照组与其他组治疗效果差异无显著性 (P均 >0 .0 5 )。结果 :(S) DHPA或 /及 (RS) DHPA与高压氧联合治疗可抑制人工感染小鼠体内日本乙型脑炎病毒的致病作用。     

Prevalence of Masturbation and Associated Factors Among Older Adults in Four European Countries

Solitary sexual activity is a free, safe, and accessible way to experience sexual pleasure. Despite these advantages, research on masturbation in later life is highly understudied. Using data from a cross-sectional probability-based survey of 3816 European adults (mean age 67 years; range 60–75 years), we explored several sociodemographic, health, attitudinal, and sexual behavioral factors associated with reported masturbation frequency. Across all countries, between 41% and 65% of men and 27% and 40% of women reported any masturbation in the preceding month. Satisfaction with sexual activity and attitudes related to disapproval of sex without love were significant predictors of reported masturbation in almost all countries and in both genders. Age, education, self-perceived health, and depression were for the most part predictive of men’s reported masturbation, but not women’s. Generally, those believing sex is beneficial to older people were more likely to masturbate, while less permissive attitudes decreased the likelihood of reporting masturbation. To improve healthy sexual aging, misinformation about masturbation and sexual attitudes in older people need to be addressed.