几种微生物杀线剂对温室芹菜根结线虫病的防治效果

为减少化学农药用量,本试验选取黑曲霉Y61菌剂、产紫青霉MH111菌剂及3%芽孢杆菌微乳剂与噻唑膦混合使用处理温室土壤防治芹菜根结线虫。结果表明:处理1(黑曲霉Y61菌剂+噻唑膦颗粒剂)、处理2(黑曲霉Y61菌剂+噻唑膦颗粒剂+地牛)、处理3(黑曲霉Y61菌剂+噻唑膦颗粒剂+沃尔坦)、处理4(3%芽孢杆菌微乳剂+噻唑膦颗粒剂)、处理5(产紫青霉MH111菌剂+噻唑膦颗粒剂)、处理6(产紫青霉MH111菌剂+噻唑膦颗粒剂+地牛)和处理7(噻唑膦颗粒剂)7个处理,药后90 d土壤中2龄幼虫数量P_f/P分别为2.22、3.80、1.48、2.66、0.67、1.40、2.80和4.92。药后90 d各处理防治效果分别为75.3%、78.2%、76.3%、52.1%、53.2%、52.2%和80.2%。药后90 d各处理产量增加为17.2%、18.5%、30.1%、2.7%、12.8%、19.7%和28.4%。综合试验结果得出,将噻唑膦与生物菌剂混合使用可以有效防治芹菜根结线虫病。

社区干预对老年骨质疏松症患者的调查与护理研究

目的 探讨社区干预对老年骨质疏松症患者的调查与护理研究。方法 将2016年1月至2016年12月在广州市花都区人民医院治疗的94例老年骨质疏松症患者随机分为对照组和观察组,各47例,对照组未给予社区护理干预,观察组给予社区护理干预,对比两组健康行为改善率、骨密度变化、生活质量。结果 观察组坚持每天喝牛奶、坚持户外晒太阳、坚持运动锻炼、戒烟戒酒、合理膳食等健康行为改善率明显高于对照组(P<0.05);观察组护理6个月后的左股骨、L1-4骨密度明显高于对照组(P<0.05);观察组BP、SF、MH、RP、PF、VT、RE、GH等SF-36评分明显高于对照组(P<0.05)。结论 社区干预对老年骨质疏松症患者的调查与护理效果显著,能有效提升患者的健康行为率,提高骨密度,改善生活质量,具有积极的临床意义。

新诊断糖尿病合并NAFLD患者血清高分子量脂联素、HOMA-IR及其比值与肝纤维化的相关性

目的探讨新诊断2型糖尿病合并非酒精性脂肪性肝病(NAFLD)患者血清高分子量脂联素(HMWA)、稳态模型胰岛素抵抗指数(HOMA-IR)及两者比值(A/H)与肝纤维化的相关性。方法回顾性分析2020年5月至2021年5月广州市花都区人民医院收治的279例新诊断2型糖尿病合并NAFLD患者的临床资料,分析其肝纤维化发生情况,并采用单因素分析、多因素logistic回归分析法探讨患者肝纤维化的独立影响因素,判断HMWA、HOMA-IR和A/H比值对肝纤维化的预测价值。结果新诊断2型糖尿病合并NAFLD患者肝纤维化患病率为15.77%(44/279)。肝纤维化患者血清HMWA、HOMA-IR和A/H比值水平分别为1.20(0.91,1.78)mg/L、3.41(2.57,5.70)和0.33(0.18,0.62),非肝纤维化患者血清HMWA、HOMA-IR和A/H比值水平分别为2.74(1.57,3.84)mg/L、2.18(1.61,3.12)和1.21(0.55,2.16)。两组患者血清HMWA、HOMA-IR和A/H比值水平比较,差异均有统计学意义(P<0.05)。除年龄、腰围外,HMWA、HOMA-IR和A/H亦是2型糖尿病合并NAFLD患者发生肝纤维化的独立影响因素(P<0.05),且其对肝纤维化有一定预测价值,A/H的曲线下面积明显大于HMWA和HOMA-IR(Z=2.768,P=0.006;Z=2.491,P=0.013),当A/H比值最佳截断值为0.52时,灵敏度为75.00%,特异度为78.72%。结论HMWA、HOMA-I和A/H与2型糖尿病合并NAFLD患者肝纤维化发生风险独立相关,并具有一定预测价值,A/H的预测效能最佳。

Lymphocyte Subsets and Sister-chromatid Exchanges in the Students Exposed to Formaldehyde Vapor

The present report evaluates the effects of formaldehyde (FA) exposure on peripheral lymphocytes by using heth genetic and immunological parameters. Twenty-three non-smoking students in the study had inhalation exposure to 0.508 ±0. 299 mg/m3 of FA for a Period of 8 weeks (3h × 3 times each week) during anatomy classes. As for composition of lymphocyte subsets after FA exposare,significant increase was found in the percentage of CD19(B cells), while sighficant decrease was observed in CD3(total T cells), CD4(T helper-inducer cells), and CD8(T cytotoxic-suppressior cells) with a P<0 .01. Increase in the ratio of T-helper-inducer cells to T-cytotoxic-suppressor cells (T4 / T8) was also observed with statistical sighcance after exposure (P < 0.001). In the meanwhile,no significant difference (P > 0 .05) was reported between lymphocyte prolifendion rate and sisterchromatid exchange (SCE) at the exposure level and duration. It is suggested that the lymphocyte subsets may be most susceptible to the effects of FA, though a single immunological endpoint is rarely related with pathophysiological interpretation.

Micronuclei in Nasal Mucosa, Oral Mucosa and Lymphocytes in Students Exposed to Formaldehyde Vapor in Anatomy Class

The frequency of micronuclei (MN) in cells of the nasal mucosa, oral mucosa and in lym-phocytes was evaluated for 25 students in anatomy classes exposed to formaldehyde (FA) overan 8-week period. Each student served as his or her own control. The time-weighted averageconcentration (TWA) of fOrmaldehyde in anatomical laboratories and in students' dormitorieswas 0. 508 ± 0. 299 mg/m3 and 0. 012 ± 0. 0025mg/m3, respectively. A higher frequency ofmicronuclei was observed in nasal and oral exfoliative cells after formaldehyde exposure (3. 85± 1. 48 vs 1 .20± 0. 676 and 0. 857 ± 0. 558 vs 0. 568 ± 0. 317, paired-t test: P< 0. 001and P < 0. 01, respectively). No significant increase in the frequency of lymphocyte micronu-clei was found after formaldehyde exposure (P >0. 05 ). The present study shows that nasalmucosa cel1s exposed through respiration are the chief target of FA-induced genotoxic effects

成都市水环境信息化建设与研究

分析了当前全国、四川省及成都市水环境的基本情况,结合成都市水环境业务需求和信息化基础,讨论了成都市水环境管理信息化建设顶层设计的必要性和可行性,对水环境信息化做了顶层设计、对重点业务进行了详细设计、提出了技术路线,并对系统建设实际应用、所遇问题和未来发展方向进行了探讨。

竹醋液处理叶菜种子的效果

为提高蔬菜的产量和质量,通过种子带菌检测、种子发芽和幼苗生物量测定试验,研究了竹醋液对芹菜、快菜和生菜3种叶菜种子的保健效果。结果表明:竹醋液可有效降低上述种子的带菌率,最高防效33.30%、22.17%和50.00%,低于次氯酸钠,与碧护(0.136%赤·吲乙·芸)相当。竹醋液可有效促进3种叶菜种子发芽,最高增效92.72%、9.28%和15.38%,优于次氯酸钠,略低或接近碧护。竹醋液还对3种叶菜的株高和根长具有一定促进作用,对芹菜的影响不及对照处理与对生菜的影响相当,对快菜的影响则优于对照处理。

UPS电源在电力系统运行安全中的保障作用

社会的不断进步、城市的不断扩张、人们对电能需求的不断提升,这些都在督促着电力行业跟上时代的发展和科技的进步,电力行业兴起了电力系统自动化、智能电网等符合社会发展的新型供电运行体系,并且已经在很多领域有了较为广泛的应用,电力系统自动化和智能电网的应用有效的降低了对人员需求,节省对物资的消耗,且在使用上简便高效,而这些新电力运行体系的运用对电力基础系统的安全和稳定提出了更高的要求,而UPS电源便作为一个保障电力系统自动化和智能电网安全有效运行的产物出现在电力系统当中,本文对当前电力行业发展对电力系统安全运行以及UPS电源的需求进行分析,接着对UPS电源的特点及其对于电力系统运行的重要作用进行研究,最后对ups电源的应用和维护进行分析。

XAFS applications in semiconductors

X-ray absorption fine structure (XAFS) has experienced a rapid development in the last three decades and has proven to be a powerful structural characterization technique nowadays. In this review, the XAFS basic principles including the theory, the data analysis, and the experiments have been introduced in detail. To show its strength as a local structure probe, the XAFS applications in semiconductors are summarized comprehensively, that is, thin films, quantum wells and dots, dilute magnetic semiconductors, and so on. In addition, certain new XAFS-related techniques, such as in-situ XAFS, micro-XAFS, and time-resolved XAFS are also shown.

Growth of Few-Layer Graphene on Sapphire Substrates by Directly Depositing Carbon Atoms

Few-layer graphene(FLG)is successfully grown on sapphire substrates by directly depositing carbon atoms at the substrate temperature of 1300℃ in a molecular beam epitaxy chamber.The reflection high energy diffraction,Raman spectroscopy and near-edge x-ray absorption fine structure are used to characterize the sample,which confirm the formation of graphene layers.The mean domain size of FLG is around 29.2nm and the layer number is about 2–3.The results demonstrate that the grown FLG displays a turbostratic stacking structure similar to that of the FLG produced by annealing C-terminated𝛼α-SiC surface.