Residues,dissipation and risk evaluation of spiroxamine in open-field-grown strawberries using liquid chromatography tandem mass spectrometry

The dissipation dynamic and residues of spiroxamine in open-field-grown strawberries were determined using liquid chromatography tandem mass spectrometry (LC–MS/MS). Spiroxamine application was performed according to Egyptian good agricultural practices recommendation. A QuEChERS-based extraction method along with direct analysis with an LC–MS/MS analytical method were optimized and validated, and the specificity of the techniques used was considered satisfactory. Good linearity (R² > 0.999) was obtained for spiroxamine within the range of 0.001–0.1 μg/ml. The mean recoveries varied between 97.1 and 108.2%, with inter- and intra-day precision (RSD) <4.9%. The limit of quantitation for spiroxamine was 0.001 mg/kg. The results indicated that spiroxamine degradation in strawberry followed first–order kinetics (R² > 0.9929) with an estimated half-life value of 4.71 days. Considering the Australian maximum residue limit (0.05 mg/kg) in strawberry and based on the results from residue trials with a preharvest interval of 14 days for strawberry, compliance can be expected. The present results could provide guidance to fully evaluate the risks of spiroxamine residues, preventing any potential health risk to consumers.     

Approximate dynamic programming algorithms for optimal dosage decisions in controlled ovarian hyperstimulation

In the controlled ovarian hyperstimulation (COH) treatment, clinicians monitor the patients’ physiological responses to gonadotropin administration to tradeoff between pregnancy probability and ovarian hyperstimulation syndrome (OHSS). We formulate the dosage control problem in the COH treatment as a stochastic dynamic program and design approximate dynamic programming (ADP) algorithms to overcome the well-known curses of dimensionality in Markov decision processes (MDP). Our numerical experiments indicate that the piecewise linear (PWL) approximation ADP algorithms can obtain policies that are very close to the one obtained by the MDP benchmark with significantly less solution time.     

福州市老年人健康自我管理能力及影响因素分析

目的 调查福州市老年人的健康自我管理能力现状,分析其影响因素,为进一步提高福州市老年人生活质量提供依据。方法 采用自行设计的一般情况调查表和成年人健康自我管理能力测评量表对福州市953名老年人进行问卷调查。结果 老年人的健康自我管理能力平均得分为（143.90 ±17.52）分,其中自我管理认知维度均分最高（3.95 ±0.65）,健康自我管理环境维度均分最低(3.67 ±0.64),年龄、患病情况、文化程度对其健康自我管理能力有影响。结论 福州市老年人的健康自我管理能力还有待于提高。老年照护工作人员应多关注高龄、患有慢性病和文化程度低的老年人。     

茯砖茶主要化学成分及其功效研究进展

茯砖茶属于黑茶中的珍贵品种,为后发酵茶,具有极特殊的发花工艺。其特别风味和保健功效深受消费者青睐。为茯砖茶得到更好地研究与开发,就茯砖茶所富含的茶多酚、茶多糖、氨基酸、咖啡碱等多种成分及其减肥降脂、降血糖、抗氧化等保健功效进行综述,同时探讨了目前茯砖茶研究过程中存在的问题,展望了茯砖茶未来的发展前景,对茯砖茶的进一步加工利用奠定了基础。     

医疗卫生工作者心理健康水平现状

 为了解医疗卫生工作者心理健康水平的现状,从2017年科技工作者心理状况调查的数据中选取医疗卫生工作者样本1463人,同时抽取其他科技工作者1441人作为对照组。调查结果发现：医疗卫生工作者抑郁风险低于对照组,焦虑和自杀意念与对照组无显著差异,工作倦怠及情感衰竭度显著高于对照组;医疗卫生工作者心理健康群体差异明显,50岁后抑郁和焦虑水平均降低,正高级职称人群的抑郁和焦虑水平均较低。情绪调控方式上,压制组表现出更多的抑郁和焦虑风险;同时,医疗卫生工作者存在睡眠时间不足、运动次数和运动时长不足、工作时长过长的问题;在心理健康服务方面,医疗卫生工作者整体优于对照组。建议改善医疗卫生工作者工作时长和工作压力,倡导健康生活方式,并提高情绪调节能力。     

封闭式运动减肥对肥胖青少年体质健康的影响

对44名14～19岁肥胖青少年进行6周的封闭式饮食控制及运动,测定实验对象的身体形态、身体机能、身体素质和血液健康等指标.通过数理统计方法对实验所测得的数据进行分析.结果表明:肥胖青少年的脂肪量、体质量、体脂率都有明显的下降(P0.05);肺活量逐渐上升,身体素质指标(耐力、柔韧、50 m跑)与血液健康指标(血脂TC、甘油三酯TG、空腔胰岛素FINS)都呈非常明显改善(P0.01).封闭式运动减肥对青少年肥胖者体质健康具有良好的效能表现.     

洛阳居民健康云服务平台的设计

采用智能云技术实现了移动客户群体的生命体征信息的便携式采集。通过简化的通信协议,实现了服务器端对海量的生命体征信息进行数据分析和数据挖掘,并在客户端用图形化方式进行显示。集成这些功能,实现了洛阳居民健康云服务平台,该平台已成功应用于洛阳市公共健康信息管理中心。     

关于提高普通高校女大学生身体素质的思考

通过对内蒙古师范大学在校女大学生有关体育活动的问卷调查的分析,结合我国普通高校体育课及课外活动的开展现状和发展趋势,就如何提高普通高校在校女大学生身体素质的问题,提出了几点建议.     

The Impact of Research Culture on Mental Health & Diversity in STEM

The onset of COVID-19, coupled with the finer lens placed on systemic racial disparities within our society, has resulted in increased discussions around mental health. Despite this, mental health struggles in research are still often viewed as individual weaknesses and not the result of a larger dysfunctional research culture. Mental health interventions in the science, technology, engineering, and mathematics (STEM) academic community often focus on what individuals can do to improve their mental health instead of focusing on improving the research environment. In this paper, we present four aspects of research that may heavily impact mental health based on our experiences as research scientists: bullying and harassment; precarity of contracts; diversity, inclusion, and accessibility; and the competitive research landscape. Based on these aspects, we propose systemic changes that institutions must adopt to ensure their research culture is supportive and allows everyone to thrive.     

云南东川区域重金属环境暴露健康风险评价

以云南省昆明市东川主要河流及附近土壤、植物为研究对象,对其进行采样分析,并根据美国环境保护署(U.S.EPA)推荐健康风险评价方法对东川流域多种环境因素进行了重金属的健康风险评价。结果表明,水环境中致癌物质造成的风险最大,风险值在2.35×10^(-4)~8.27×10^(-4),达到U.S.EPA推荐的最大值10^(-4),植物根部的健康风险值为0.40×10^(-1)~7.00×10^(-1),茎叶部分的风险值为2.42×10^(-2)~15.24×10^(-2),根部存在的重金属对人体的健康风险约为茎叶部分的5倍;土壤中非致癌物质的健康风险影响较大,总健康风险值区间为0.64×10^(-1)~3.83×10^(-1)。评价结果可为该区域地表水、土壤和植物资源的污染治理、保护开发提供依据。