鱼菜共生复合系统研究进展

鱼菜共生是一种由循环水养殖和水耕栽培构成的新型复合生产体系,该体系具有资源利用率高、不用化肥和抗生素、低耗高效、可持续等特点,属于生态环保的现代农业种养系统。虽然鱼菜共生系统近年来被广泛推广应用,但仍缺乏系统化的认知和整体性的分析。总结了鱼菜共生系统技术发展历程、主要内容、研究进展和国内外发展趋势,预测未来鱼菜共生系统构建趋向解耦型、生态型,布局迈向城镇化、立体化,推行大规模智能化、商业化,呈现多元化融合创新等趋势,同时提出相关改善建议,为鱼菜共生复合系统高效构建和可持续发展提供科学思路。

弥散加权磁共振成像的表观扩散系数在肺癌分期、淋巴结转移和胸膜转移中的临床应用价值

回顾性分析2017年至2020年于我院确诊的120例肺癌患者的磁共振成像(MRI)的常规和DWI序列扫描特点,分析表观扩散系数(ADC)平均值、ADC中位值、ADC-5^(th)、ADC-10^(th)、ADC-25^(th)、ADC-50^(th)、ADC-75^(th)、ADC-90^(th)和肺癌分期的相关性。研究结果显示:肺癌不同病理分期、不同分化程度、和是否存在淋巴结转移患者ADC平均值、ADC中位值、ADC-25^(th)、ADC-50^(th)、ADC-75^(th)、ADC-90^(th)之间具有显著差异(均P<0.05),其中分期越高则ADC值越小(P<0.05),分化程度越高ADC值则越低(P<0.05),且淋巴结转移阳性患者的ADC值较阴性患者低(P<0.05)。因此,ADC值对于判断肺癌分期和淋巴结转移具有一定的临床意义。

Effects of dietary menadione on the activity of antioxidant enzymes in abalone, Haliotis discus hannai Ino

A 240-day growth experiment in a re-circulating water system was conducted to investigate the effects of dietary menadione on the growth and antioxidant responses of abalone Haliotis discus hannai Ino. Triplicate groups of juvenile abalone (initial weight: 1.19 ± 0.01 g; shell length: 19.23 ± 0.01 mm) were fed to satiation with 3 semi-purified diets containing 0, 10, and 1 000 mg menadione sodium bisulfite (MSB)/kg, respectively. Results show that there were no significant differences in the rate of weight gain or in the daily increment in shell length of abalone among different treatments. Activities of superoxide dismutase (SOD), glutathione peroxidase (GPX), glutathione S-transferase (GST) and glutathione reductase (GR) in viscera were significantly decreased with dietary menadione. However, activities of these enzymes except for GPX in muscle were increased. Therefore, antioxidant responses of abalone were increased in muscle and decreased in viscera by dietary menadione.

Optical Fiber Grating Sensor for Force Measurement of Anchor Cable

The development of the sensor suitable for measuring large load stress to the anchor cable becomes an important task in bridge construction and maintenance. Therefore, a new type of optical fiber sensor was developed in the laboratory - optical fiber grating sensor for force measurement of anchor cable （OFBFMAC）. No similar report about this kind of sensor has been found up to now in China and other countries. This sensor is proved to be an effective way of monitoring in processes of anchor cable installation, cable cutting, cable force regulation, etc, with the accurate and repeatable measuring results. Its successful application in the tie bar cable force safety monitoring for Wuhan Qingchuan bridge is a new exploration of optical fiber grating sensing technology in bridge tie bar monitoring system.

开口料及猪粪对黑水虻幼虫生长的影响

【目的】探究黑水虻初孵幼虫采用开口料饲喂是否更有利于其后期生长,并研究猪粪与麦麸混合培养料的最适比例。【方法】设初孵阶段采用开口料(全麦麸)饲喂的对照处理及不采用开口料饲喂的试验处理,用猪粪含量分别为90%、80%、60%、50%的麦麸混合培养料进行饲喂。定期测量黑水虻幼虫的体长、体宽、体重。【结果】对照处理中,黑水虻幼虫体长、体宽、体重的增长随着猪粪含量的降低而逐渐增高,在猪粪含量为50%时达到最佳。试验处理中,幼虫的生长指标随着猪粪含量的降低呈现先增后减的趋势,在猪粪含量为80%时达到最佳。比较对照处理与相应试验处理,除猪粪含量为90%的两组差异不显著外,其余整体生长指标均表现为对照处理优于试验处理,且差异显著。【结论】采用开口料饲喂黑水虻初孵幼虫更有利于其后期生长,且粪含量为50%的猪粪麦麸混合培养料对幼虫生长最有利。