Evaluating a push–pull strategy for management of Drosophila suzukii Matsumura in red raspberry          下载免费PDF全文

Anna K Wallingford  Dong H Cha  Gregory M Loeb 《Pest management science》2018,74(1):120-125

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Effect of catheter size and injection rate of contrast agent on enhancement and image quality for triple‐phase helical computed tomography of the liver in small dogs          下载免费PDF全文

Sang‐Kwon Lee  Dahae Lee  Dongeun Kim  Ahyoung Cha  Jihye Choi 《Veterinary radiology & ultrasound》2017,58(6):664-670

Rapid contrast injection is recommended for triple‐phase helical computed tomography (CT) of the liver. However, a large‐gauge catheter is needed for faster contrast injection and this is not practical for small breed dogs or cats. The purpose of this crossover group study was to evaluate applicability of a lower injection rate with a small‐gauge (G) catheter for triple‐phase hepatic CT in small dogs. Triple‐phase CT images were acquired for six beagle dogs using three protocols: an injection rate of 1.5 ml/s with a 24 G catheter, 3.0 ml/s with a 22 G catheter, and 4.5 ml/s with a 20 G catheter. Enhancement of the aorta, portal vein, and hepatic parenchyma was measured in each phase (arterial, portal, and delayed) and image quality was scored subjectively by two observers. Injection duration, time to scan delay, and time to peak enhancement were also recorded. Contrast injection duration decreased with a higher injection rate (n = 6, P ≤ 0.01), but time to peak enhancement and time to scan delay were not significantly affected by injection rates and catheter sizes. Contrast injection rate did not significantly affect aortic, portal, and hepatic enhancement. In addition, separation between each phase and quality of images was subjectively scored as good regardless of injection rate. Findings from the current study supported using an injection rate of 1.5 ml/s with a catheter size of 24 G for triple‐phase hepatic CT in small dogs (weight < 12 kg).  相似文献   

Responses of phytohormones and gas exchange to mycorrhizal colonization in trifoliate orange subjected to drought stress     

Wan-Xi Wang  Fei Zhang  Zi-Li Chen  Jin Liu  Cha Guo  Jia-Dong He 《Archives of Agronomy and Soil Science》2017,63(1):14-23

Phytohormones have an essential ability to adapt to abiotic stresses, including drought stress (DS), by mediating physiological and molecular processes. Arbuscular mycorrhizas (AMs) can enhance tolerance of DS, but the information regarding phytohormone changes in AM plants exposed to DS is little known. Trifoliate orange (Poncirus trifoliata) seedlings colonized by an AM fungus Funneliformis mosseae were subjected to DS and well-watered for 6 weeks. Plant growth performance, gas exchange, indole-acetic acid (IAA), gibberellins (GAs), brassinosteroids (BRs), abscisic acid (ABA), methyl jasmonate (MeJA) and zeatin riboside (ZR) were determined. The 6-week DS treatment strongly restricted root mycorrhizal colonization. Mycorrhizal inoculation significantly increased plant growth parameters under DS, as compared with non-mycorrhizal treatment. Mycorrhizal treatment also induced significantly higher leaf-relative water content, net photosynthetic rate, transpiration rate and stomatal conductance but lower intercellular CO₂ concentration and leaf temperature under DS, compared with non-mycorrhizal treatment. Mycorrhizal plants under DS condition represented significantly higher leaf ABA, IAA, GAs, BRs and ZR levels than non-mycorrhizal plants. The study, hence, suggested that mycorrhizal inoculation induced the changes of gas exchange and endogenous phytohormone levels to enhance drought tolerance in trifoliate orange.  相似文献   

基于BP神经网络的橡胶苗叶片磷含量高光谱预测   总被引：4，自引：3，他引：1  

郭澎涛  苏艺  茶正早  林清火  罗微  林钊沐 《农业工程学报》2016,32(Z1):177-183

为验证高光谱技术在橡胶苗叶片磷素营养诊断方面的可行性,该文以砂培橡胶苗为研究对象,利用高光谱仪测得不同磷处理水平下橡胶苗叶片光谱反射率,并应用微分技术求取去噪后光谱反射率一阶和二阶导数,以叶片磷含量和光谱变量相关性分析为基础,选择出叶片磷含量敏感波段,最后以敏感波段为输入变量,结合多重线性回归、偏最小二乘回归和反向传播神经网络模型对叶片磷含量进行预测。结果表明:原始光谱反射率555和722 nm、一阶导数674、710、855、1 091、1 197、1 275、1 718、2 181和2 228 nm以及二阶导数816、890、1 339、1 357和2 201 nm为叶片磷含量敏感波段;反向传播神经网络模型预测精度最高,训练集和验证集中预测值和实测值之间的相关系数r分别为0.964和0.967,均方根误差RMSE分别为0.0139和0.00856,模型性能指数(ratio of performance to deviation,RPD)分别为3.71和3.23,证明高光谱技术可以快速、准确诊断橡胶苗叶片磷含量。  相似文献   

Preparation of poly(vinyl alcohol)/ZrO2 composite nanofibers via co-axial electrospinning with higher ZrO2 particle content     

Young Min Im  Tae Hwan Oh  Jin Wook Cha  Young Ho Seo  Jun Sung Hwang  Joseph A. Nathanael  Sung Soo Han  Soon Ho Jang 《Fibers and Polymers》2014,15(10):2066-2071

Poly(vinyl alcohol) (PVA)/zirconium oxide (ZrO₂) composite nanofibers with a skin-core structure were prepared and the effect of ZrO₂ particle content on uniform web formation was investigated. The optimized polymer concentration, tip to collector distance, and applied voltage for electrospinning were 11 wt%, 12 cm, and 20 kV, respectively. Skin-core PVA/ZrO₂ composite nanofibers containing up to 12 wt% ZrO₂ were successfully prepared, but it was difficult to obtain PVA/ZrO₂ composite nanofiber webs via conventional electrospinning. Increasing the amount of ZrO₂ caused the morphology of the PVA/ZrO₂ composite nanofibers to become a non-uniform nanoweb with irregular nanofiber diameters. While it was difficult to obtain a uniform nanofiber web containing a content of ZrO₂ over 6 wt% for conventional electrospinning, a more uniform nanofiber web could be obtained at up to 9 wt% ZrO₂ using a skin-core dual nozzle. More uniform webs could also be obtained when ZrO₂ was in the skin rather than the core.  相似文献   

Effect of pineapple protease on the characteristics of protein fibers     

Joonseok Koh  Sang-Mo Kang  Soo-Jin Kim  Min-Kyung Cha  Yoon-Jung Kwon 《Fibers and Polymers》2006,7(2):180-185

A pineapple protease, bromelain, was used to improve the dyeing properties of protein fibers such as wool and silk. The optimal condition for the activity of the pineapple protease was about 60 °C at pH 7. The wool and silk were treated with the protease extracted from a pineapple and the K/S values of the dyed wool and silk were measured using a spectrophotometer in order to compare the dye uptake. The protease treatment enhanced the dyeing properties of protein fibers without severe changes in mechanical properties. The surface appearances of protease-treated fibers were observed by microscopy.  相似文献   

Automated aerosol puffers effectively deliver 1‐OCTEN‐3‐OL,an oviposition antagonist useful against spotted‐wing drosophila     

Dara G Stockton  Anna K Wallingford  Dong H Cha  Gregory M Loeb 《Pest management science》2021,77(1):389-396

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磷肥在砖红壤中淋溶特征的研究初报   总被引：6，自引：0，他引：6  

林清火  罗微  林钊沐  茶正早 《热带作物学报》2004,25(1):58-63

在实验室用土柱对发育于片麻岩的砖红壤进行磷肥淋溶特征研究。结果表明：随着施肥量增加，PO4^3-累计渗漏量相应增加，但不是简单的线形增加关系，在施P量为106．1kg／hm^2与70．7kg／hm^2之间，P累计渗漏量存在一个“跃变”点：磷素在砖红壤中移动性弱，当施P肥水平为141．5kg／hm^2时，活性磷未能穿透12cm土层；在低灌溉量下，磷的渗漏量与灌水量几乎呈线形增加的趋势，但高灌溉量下，则无显著差异，且在等量灌溉下，多次灌溉比单次灌溉更能促进磷肥的运移。  相似文献   

茶树新品种石佛翠、石佛香选育研究     

查道辛  汪士杰  王文杰  丁宪虎  荣光明 《中国茶叶》2006,28(3):22-23

大别山茶区乃至整个长江以北茶区，由于纬度偏北，早春气温偏低，寒冻与晚霜危害频繁，致使新茶上市偏迟，产量不稳定。江北茶区为绿茶主产区。名优绿茶品种多，目前从该区选育出的品种中产量、品质、抗性兼优的品种较少；从外地引进的品种，相当一部分仍存在一定程度的适制性和抗性（尤其是抗寒性）上的不适应性。为此，进行了适宜在江北茶区栽培的早生、优质、扰寒茶树新品种（尤其是适制名优绿茶的新品种）的选育。经过11年的试验研究，从大别山腹地岳西县石佛茶园群体种中采用单株选种法选育出了早生、优质、抗寒，适制名优绿茶的新品种——石佛翠、石佛香。  相似文献   

云南文山州畜禽饲用秸秆的糖、蛋白和脂类养分的含量和综合等级     

张雪廷  袁恩平  王灿  李罡  王绍祥  李云  赵水灵  钟正阳  李桂琼  杨迪  夏攀  许姹  赵昶灵 《中国农学通报》2022,38(24):145-150

研究旨在阐明云南文山州常用畜禽饲用秸秆的糖、蛋白和脂类养分的含量和综合等级,为该州饲用秸秆的养分评价和配置提供依据。以文山州近年广大畜禽养殖户常用的草果、‘西畴芭蕉芋’、‘文金1号’、‘文紫椒3号’、小米辣、滇重楼、象草和玉米‘文青贮2号’秸秆为材料,用分光光度法测定了秸秆的可溶性糖、总淀粉和可溶性蛋白质含量,用凯氏定氮法和索氏抽提法分别测定了粗蛋白和粗脂肪含量,并用隶属函数法评价了秸秆糖、蛋白和脂类养分的综合等级。结果表明：滇重楼秸秆的可溶性糖和可溶性蛋白质含量均最高,分别为163.603±0.218 mg/g(DW)和16.637±0.038 mg/g(DW),‘文青贮2号’秸秆的总淀粉和粗脂肪含量均最高,分别约为283.008±2.507 mg/g(DW)和(3.598±0.055)%,‘文紫椒3号’秸秆的粗蛋白含量最高,约为(11.864±0.202)%;可溶性糖、总淀粉、可溶性蛋白质、粗蛋白和粗脂肪含量在不同秸秆间的差异均达到极显著水平;8种秸秆糖、蛋白和脂类养分的综合等级为：滇重楼>‘文青贮2号’>小米辣>‘文紫椒3号’>西畴芭蕉芋>象草>‘文金1号’>草果。  相似文献