Interactions between phosphorus availability and microbes in a wheat–maize double cropping system: A reduced fertilization scheme

Mechanisms controlling phosphorus(P) availability and the roles of microorganisms in the efficient utilization of soil P in the wheat–maize double cropping system are poorly understood. In the present study, we conducted a pot experiment for four consecutive wheat–maize seasons(2016–2018) using calcareous soils with high(30.36 mg kg^–1) and low(9.78 mg kg^–1) initial Olsen-P content to evaluate the effects of conventional P fertilizer application to both wheat and maize(Pwm) ...     

高油酸花生四川引种试验

为了快速筛选出适应四川生态环境的高油酸花生品种,发掘优质的高油酸资源,进而促进四川高油酸花生产业发展。以16份本地及引进的高油酸花生品种为材料,用调查取样及数据分析法比较以上品种在经济学性状、产量、生长特点、抗性及单株产量等方面的表现。‘中花415’、‘冀花13’、‘豫花37’、‘开农1760’和‘冀花16’在荚果大小、饱果率、出仁率、百仁重、产量、口感等性状上表现优良‘;中花415’、‘豫花37’、‘花育961’、‘冀花13’、‘冀花16’在分枝数、出苗率、长势、抗性等方面综合表现优良;‘开农1760’、‘冀花13’、‘冀花16’、‘豫花37’、‘中花415’在单株总果数、饱果数、饱果率和单株产量上综合表现优异。对‘冀花13’‘、冀花16’‘、豫花37’‘、中花415’表现优良的外引材料将作进一步示范推广,省外引进的品种需要一定时间适应四川本土的环境气候。     

少籽西瓜高产优质栽培技术研究

在湖南西瓜生长前期低温、多雨、寡照,后期高温、干旱的气候条件下,对栽培密度与整枝方式、播种期、有机肥种类与用量等栽培因子对少籽西瓜产量和品质的影响进行研究的结果表明：在海拔３００ｍ左右的平克和丘陵区,肥力中等的砂质水稻土上,少籽西瓜适宜播种期为３月中下旬到４月初,栽培密度为６００株／６６７ｍ＾２,整枝方式为双蔓整枝较适宜。有机肥可明显提高少籽西瓜的产量和品质,有机肥用量至少应占总用氮量的３０％以上     

Experimental research on cardiac fibrosis induced by recombinant mouse interleukin-11 in mice

AIM To observe the effect of recombinant mouse interleukin-11 （rmIL-11）injected subcutaneously into mice on heart structure and function and to determine its pro-fibrotic effect. METHODS C57BL/6 mice were randomly divided into experimental group and control group.The mice in experimental group were injected subcutaneously with recombinant mouse IL-11 at the dose of 100 μg·kg^-1·d^-1 for 3 consecutive weeks, while the control group were given equal volume of normal saline in the same way. After the experiment was finished, the parameters of heart function were measured by echocardiography.The heart weight was weighed and the cardiac weight index (CWI) was calculated. HE staining and Masson's trichrome staining were performed to observe the pathological changes and the extent of myocardial fibrosis in mouse myocardia respectively, and the cardiac collagen volume fraction (CVF) was calculated. The expression levels of extracellular matrix proteins in the myocardial tissues of mice, including type Ⅰ collagen, type Ⅲ collagen and fibronectin, were determined by Western blot. RESULTS Left ventricular ejection fraction and left ventricular fraction shortening in experimental group were obviously lower than those in control group (P<0.01), however left ventricular end-diastolic diamension and left ventricular end systolic dimension were significantly higher than those in control group (P<0.05).Compared with control group, the CWI was increased (P<0.01), the myocardial arrangement was disorder, the necrosis of cardiac myocytes was increased, and excessive deposition of collagen was observed in the myocardial tissues in experimental group. Correspondingly, the CVF and protein levels of type Ⅰ collagen, type Ⅲ collagen and fibronectin in the left ventricle in experimental group were increased significantly (P<0.05). CONCLUSION Injection of rmIL-11 into the mice subcutaneously induces fibrogenesis in the heart, which implies that IL-11 is likely a novel pro-fibrotic factor.     

自由基清除剂对香蕉水分胁迫的保护作用

本文用苯皿酸钠、ａ－生育酚和Ｖ 作为外源自由基清除剂,研究其对香蕉的抗旱保护作用结果表明,外源自由基清除剂预处理降低了干旱条件下香蕉叶片细胞的膜生和膜脂过氧化程度,延缓叶绿素、可溶性蛋白南含量的降低,表现出外源自由基保护剂对减轻干旱引起的自由基伤害,提高香蕉抗旱能力具保护作用。不同清除剂的保护效果存在差异,以ａ－生育酚效果最好。     

单细胞凝胶电泳检测除虫脲光解产物对小鼠肝脏DNA损伤研究

采用单细胞凝胶电泳法对不同浓度除虫脲经紫外光照射后的混合物可能导致小鼠肝脏细胞DNA损伤的作用进行了研究,应用CASP软件分析彗星图像,得出彗星尾部DNA百分含量、彗星尾长、尾距和Olive尾距4个指标.通过SPSS软件分析表明,其光降解混合物导致的彗星拖尾现象与空白组有显著区别,且在一定浓度范围呈现剂量-效应关系,表明不同浓度除虫脲经光降解后其混合物具有一定的致突、致癌性,且毒性随着浓度的降低而减小.     

棉籽和蓖麻籽的冷榨试验与数值模拟

探讨棉籽和蓖麻籽植物油料的冷榨应力-应变关系、应力-压缩比关系以及加载速率对应力-应变关系和应力-压缩比关系的影响,探讨临界压榨压力选取问题。进行了棉籽和蓖麻籽冷榨试验,采用川北方程建立双曲线型应力-应变模型和压缩比的理论计算模型。研究表明,加载速率对油料破碎应力、应变以及应力-应变关系有影响,速率越大,破碎应力和应变越大;棉籽和蓖麻籽的模拟结果与实测值比较吻合。根据压缩比变化率及其斜率曲线近似确定出棉籽和蓖麻籽工程临界压榨压力分别为70 MPa和100 MPa。     

浅论高校图书馆本校文献专藏建设

在特色馆藏的范围内。为本校文献下定义,论述本校文献的基本类型。本校文献专藏建设的意义,分析建设过程中存在的问题。提出相应的解决方案,以期推动大学图书馆本校文献专藏的建设。     

伏毛铁棒锤种子萌发特性的研究

为探明伏毛铁棒锤(Aconitum flavumHand.-Mazz.)种子的萌发特性,采用了物理、化学、植物激素等不同处理方法对种子进行预处理.试验结果表明:①种子在常温(20±1)℃下有休眠现象,发芽率仅为1.3%;②低温15℃是种子发芽的最适宜温度;③机械去皮后种子发芽率有所提高,可达28%;④采用质量分数为100 mg/kg的赤霉素处理24 h,去皮种子发芽率最高可达到86.0%.因此,种皮障碍和内部萌发抑制物的存在是造成种子休眠的重要原因,生产上应首先去掉种子的外种皮,再用适宜浓度的赤霉素处理,会达到理想的出苗效果.     

我国农业领域的知识产权保护探讨

随着经济全球化的发展,知识产权已成为各国发展经济和参与国际竞争的关键因素之一。文章通过对我国农业领域知识产权保护现状及存在问题的分析,提出了提高农业领域知识产权保护的措施。