为探究银杏外种皮(Ginkgo biloba sarcotesta)与垂序商陆叶(Phytolacca americana leaf)提取物复配剂对小菜蛾及其主要危害对象十字花科植物幼苗的生理影响,本研究利用直接测量、显微解剖、分光光度法等多种方法测定了复配剂作用前后小...为探究银杏外种皮(Ginkgo biloba sarcotesta)与垂序商陆叶(Phytolacca americana leaf)提取物复配剂对小菜蛾及其主要危害对象十字花科植物幼苗的生理影响,本研究利用直接测量、显微解剖、分光光度法等多种方法测定了复配剂作用前后小菜蛾及十字花科代表性植物萝卜幼苗的生理变化。结果发现:复配剂处理下未被致死小菜蛾幼虫继续完成发育并化蛹结茧,但茧重及羽化率显著低于对照组(P<0.05);复配剂未致小菜蛾幼虫肠道出现明显形状、颜色、表观结构变化,但显著降低了幼虫体内神经传导、解毒、抗氧化相关的乙酰胆碱酯酶、羧酸酯酶、过氧化物酶、过氧化氢酶活性(P<0.05);复配剂对萝卜幼苗的株高、鲜重、干重有一定抑制效应,并引发幼苗体内SOD活性、POD活性、MDA含量、叶片电导率增加及叶片净光合速率的动态变化(先降后升)。结果提示,复配剂协同影响了小菜蛾幼虫体内神经、解毒、抗氧化多种生理机能,且复配剂毒性效应可持续小菜蛾整个生命阶段;其施用还诱发十字花科植物幼苗出现生长抑制及生理应激,因此在达到防治效果前提下应尽量降低复配剂的使用浓度。展开更多
In order to enhance the contrast of low-light images and reduce noise in them, we propose an image enhancement method based on Retinex theory and dual-tree complex wavelet transform(DT-CWT). The method first converts ...In order to enhance the contrast of low-light images and reduce noise in them, we propose an image enhancement method based on Retinex theory and dual-tree complex wavelet transform(DT-CWT). The method first converts an image from the RGB color space to the HSV color space and decomposes the V-channel by dual-tree complex wavelet transform. Next, an improved local adaptive tone mapping method is applied to process the low frequency components of the image, and a soft threshold denoising algorithm is used to denoise the high frequency components of the image. Then, the V-channel is rebuilt and the contrast is adjusted using white balance method. Finally, the processed image is converted back into the RGB color space as the enhanced result. Experimental results show that the proposed method can effectively improve the performance in terms of contrast enhancement, noise reduction and color reproduction.展开更多
文摘为探究银杏外种皮(Ginkgo biloba sarcotesta)与垂序商陆叶(Phytolacca americana leaf)提取物复配剂对小菜蛾及其主要危害对象十字花科植物幼苗的生理影响,本研究利用直接测量、显微解剖、分光光度法等多种方法测定了复配剂作用前后小菜蛾及十字花科代表性植物萝卜幼苗的生理变化。结果发现:复配剂处理下未被致死小菜蛾幼虫继续完成发育并化蛹结茧,但茧重及羽化率显著低于对照组(P<0.05);复配剂未致小菜蛾幼虫肠道出现明显形状、颜色、表观结构变化,但显著降低了幼虫体内神经传导、解毒、抗氧化相关的乙酰胆碱酯酶、羧酸酯酶、过氧化物酶、过氧化氢酶活性(P<0.05);复配剂对萝卜幼苗的株高、鲜重、干重有一定抑制效应,并引发幼苗体内SOD活性、POD活性、MDA含量、叶片电导率增加及叶片净光合速率的动态变化(先降后升)。结果提示,复配剂协同影响了小菜蛾幼虫体内神经、解毒、抗氧化多种生理机能,且复配剂毒性效应可持续小菜蛾整个生命阶段;其施用还诱发十字花科植物幼苗出现生长抑制及生理应激,因此在达到防治效果前提下应尽量降低复配剂的使用浓度。
基金supported in part by the National Natural Science Foundation of China(Nos.61602257 and 61501260)the Natural Science Foundation of Jiangsu Province(No.BK20160904)+2 种基金the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX17_0776)the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province(No.16KJB520035)the NUPTSF(Nos.NY214039 and NY215033)
文摘In order to enhance the contrast of low-light images and reduce noise in them, we propose an image enhancement method based on Retinex theory and dual-tree complex wavelet transform(DT-CWT). The method first converts an image from the RGB color space to the HSV color space and decomposes the V-channel by dual-tree complex wavelet transform. Next, an improved local adaptive tone mapping method is applied to process the low frequency components of the image, and a soft threshold denoising algorithm is used to denoise the high frequency components of the image. Then, the V-channel is rebuilt and the contrast is adjusted using white balance method. Finally, the processed image is converted back into the RGB color space as the enhanced result. Experimental results show that the proposed method can effectively improve the performance in terms of contrast enhancement, noise reduction and color reproduction.
