Differences in the geographic distribution of lymphoma subtypes in Golden retrievers in the USA

The purpose of this cross‐sectional study was to examine differences in the geographic distribution of two distinct subtypes of canine lymphoma (CL), B‐cell lymphoma (BCL) and T‐zone lymphoma (TZL), in the USA while accounting for heritable risks associated with the outcome of disease through inclusion of only one breed of dog. This study included 454 Golden retrievers and associations between geographic areas of the USA and the phenotypic variant of lymphoma were examined using multivariable logistic regression. There was a detectable difference in the geographic distribution of BCL and TZL with dogs in the Northeast [odds ratio (OR) = 3.4, 95% confidence interval (CI) = 1.6–7.0] and East North Central regions (OR = 12.1, 95%CI = 3.6–40.5) being more likely to be diagnosed with TZL as compared to dogs in the Mountain region of the USA. The finding of non‐random geographic distribution of lymphoma subtypes suggest that environmental risk factors may contribute to the development of different types of CL.     

空间自相关性对冬小麦种植面积空间抽样效率的影响

空间抽样是实现区域农作物面积高效估算的重要手段,农作物分布受自然条件等因素影响普遍存在空间自相关性,但以往针对空间相关性对农作物面积抽样效率的影响研究明显不足.该研究选取安徽省凤台县为研究区,通过2017年4月4景GF-1全色多光谱影像(Panchromatic and Multispectral,PMS)与Googl...     

黄土侧向变形的真三轴试验研究

保持小主应力、中主应力不变,在大主应力方向加荷是实际工程中存在的一种应力路径,就该应力路径分别对不同含水率的重塑黄土进行了几组真三轴试验,对其应力-应变关系及反映侧向变形变化规律的泊松比进行了特定条件下的研究.研究结果表明,应力-应变关系的偏差应力和初始切线模量随含水率的增大而减小,相同的偏差应力下含水率越大侧向应变就越大.在上述应力路径下剪切,中主应力方向首先压缩,但表现不明显,很快就转为膨胀,小主应力方向膨胀,泊松比可以大于0.5,且小主应力方向膨胀量大于中主应力膨胀量.     

修剪施肥相结合对低产低效茶园茶叶品质的影响

[目的]研究修剪和施肥交互作用对低质低效茶园茶叶品质的影响,探讨修剪方式和施肥方式对低产低效茶园质量的提升作用。[方法]4种修剪方法分别为轻修剪、深修剪、重修剪和台刈,2种肥料分别为氨基酸肥和塔式生物肥,分析水浸出物、氨基酸、茶多酚、咖啡碱含量。[结果]轻修剪结合施用有机肥可提高茶叶水浸出物和茶多酚含量;重修剪结合施用有机肥可提高茶叶氨基酸含量,降低茶叶咖啡碱含量。[结论]该研究可为低产低效茶园茶叶的高产优质栽培提供参考。     

中卫市生态园林城市绿地系统规划研究

在对中卫市城市绿地调查的基础上,对中卫市生态园林城市绿地系统进行规划研究,以解决该地区可利用资源丰富,但利用难度大的问题。依据国家生态园林城市建设标准,提出中卫市生态园林城市绿地系统规划目标,将城市绿地系统规划为"一城三区,三轴贯穿,功能互补"的布局结构,即北部防风固沙生态景观区,中部城市景观环境建设区,南部黄河湿地游隙保护区,以及东西、南北、滨河三条生态景观轴,从整体布局到分类规划、近远期规划,确定中卫市绿地系统"绿环围城,多层防护,从外向内"的整体规划方向,实现将中卫市建设成生态园林城市的目的,并为其他沙漠边缘地带城市建设提供一定的借鉴。     

浅谈岩生植物及其在园林中的应用

岩生植物具有植株低矮,株形紧密;根系发达,耐干旱,耐瘠薄土壤;生长缓慢,生活期长;花色艳丽等特点.岩生植物按自然分类系统分为苔藓植物、蕨类植物、裸子植物、被子植物.按光照要求分为喜光类、耐荫类、喜阴湿类.按在园林中的应用分类,分为草本类、藤木类、灌木及矮乔类、蕨类、苔藓地衣类.论述了岩生植物在园林中的应用形式、岩生植物的选择与配置等.     

浅析园林植物造景

园林植物是园林规划设计的灵魂,在全局中起着不可低估的作用。它遵循着设计应有的原则和规律,以自己独特的方式,将园林植物之美应用于园林规划设计之中。     

我国人口流动的现状及影响因素分析

改革开放以来，我国人口流动的规模不断扩大。本文阐述了我国人口流动的现状，并运用多元线性回归计量实证模型对影响人口转移取向的基本因素进行了分析，最后提出了从政府行为角度对待当前人口流动问题的政策方向。     

Differential responses of cells from human skin keratinocyte and bovine mammary epithelium to attack by pore-forming Staphylococcus aureus alpha-toxin

Human skin keratinocytes HaCat attacked by Staphylococcus aureus α-toxin showed a transient drop of cellular ATP levels whereas in toxin-perforated bovine mammary epithelial cells (BMEC), the ATP levels dropped more slowly. Morphologically, during the ATP level depletion, HaCat cell developed a spacious intracellular vacuole together with the transient influx of trypan blue. WST-1 signal, which tested the function of mitochondrial enzyme in viable cells, also decreased concomitantly. On the other hand, BMEC excluded trypan blue and vacuolation was not observed throughout the experiment. We conclude that mammary epithelial cells resist the toxin better than keratinocytes. This is the first report showing that α-toxin enhances transient membrane permeability to large molecules, temporary vacuole formation and the transient defect of mitochondrial enzyme in viable cells without cell lysis.     

香港远足径建设管理经验及启示

远足作为最受欢迎的健身休闲活动,实现了居民与郊野的良性互动,许多城市开始关注并尝试建设远足体系。香港通过远足径的建设形成连接郊野公园的网络,并实现郊野公园的功能提升与拓展,提供了可资借鉴的样本。根据其概念和内涵,分析了远足径与绿道在功能定位和管理体制上的差异。以港岛径为例,归纳了选线规划和游径设施设计要点,总结了植被优化修复、安全保障管理、多元社会参与、花事活动组织方面的管理运营经验,并探讨港岛径对其他城市远足径建设与运营的启示。