期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
基于机器视觉技术的单粒葡萄质量与果径预测分级研究 被引量:12
1
作者 李俊伟 郭俊先 +2 位作者 胡光辉 刘军 虞飞宇 《新疆农业科学》 CAS CSCD 北大核心 2014年第10期1862-1868,共7页
【目的】采用机器视觉技术,针对新疆无核白和红提单粒葡萄的质量和果径大小进行预测和分级研究。【方法】在不同的颜色特征空间模型,预处理原始图像,采用最大类间方差法分割目标区域;采用数学形态学方法去除二值图像中部分果梗及噪声点... 【目的】采用机器视觉技术,针对新疆无核白和红提单粒葡萄的质量和果径大小进行预测和分级研究。【方法】在不同的颜色特征空间模型,预处理原始图像,采用最大类间方差法分割目标区域;采用数学形态学方法去除二值图像中部分果梗及噪声点,获得最佳二值图像;基于二值图像,分析获取单粒葡萄的几何特征;最后,分别采用一元线性回归法和偏最小二乘回归法预测单粒葡萄的质量和果径,采用二次判别分析法对单粒葡萄的质量和果径进行分级。【结果】利用短轴与果形指数特征相结合建立的偏最小二乘回归模型可有效预测单粒葡萄的质量和果径,预测决定系数达到0.98和0.945;基于该特征组合的二次判别分析法可用于单粒葡萄的质量和果径分级,准确率超过85%。【结论】机器视觉技术能够较准确预测单粒葡萄的质量和果径,并能对质量和果径进行分级。 展开更多
关键词 机器视觉 单粒葡萄 回归分析 二次判别分析 质量 果径 分级
下载PDF
Study on neoplasia of hydatidiform mole by detecting telomerase reverse transcriptase mRNA expression in peripheral blood mononuclear cells
2
作者 Bao Lijun Xu Jing +3 位作者 Yang Shangwu Li Fen Zou Yuliang Huang Hui 《Journal of Medical Colleges of PLA(China)》 CAS 2010年第2期84-90,共7页
By setting up a real-time fluorescent quantitative RT-PCR assay to detect human telomerase reverse transcriptase (hTERT) mRNA in hydatidiform mole in peripheral blood mononuclear cells, to analyze the correlation be... By setting up a real-time fluorescent quantitative RT-PCR assay to detect human telomerase reverse transcriptase (hTERT) mRNA in hydatidiform mole in peripheral blood mononuclear cells, to analyze the correlation between the expression level of hTERT mRNA and the prognosis of hydatidiform mole, and to evaluate the clinic value of quantitative determination of hTERT mRNA in the diagnosis of hydatidiform mole. Methods: A real-time fluorescent quantitative RT-PCR (FQ RT-PCR) assay based on TaqMan fluorescence methodology and the Light-Cycler system was used to quantify the full range of hTERT mRNA copy numbers in 30 samples of hydatidiform mole and the neoplasia of hydatidiform mole. The normalized hTERT (NhTERT) was standardized by quantifying the number of GAPDH transcripts as internal control and expressed as 100x (hTERT/GAPDH) ratio. Based on the prognosis of the hydatidiform mole, the patients were divided into two groups: the experimental group and the control group, to compare the telomerase reverse transcriptase mRNA expression in peripheral blood mononuclear cells. Results: hTERT mRNA was both expressed in the peripheral blood mononuclear cells and pathological tissues in the mole experimental group and the control group. In the mole experimental group, the values were 6.31±0.32 and 6.24±0.44, respectively, and there was no significant difference between them (P〉0.05). But in the control group the values were 1.21±0.65 and 1.40±0.61, respectively, and there was no significant difference between them (P〉0.05) The values in experimental group was significantly higher than those in the control group (P〈0.01). Conclusion: Quantitative determination of hTERT mRNA by FQ RT-PCR is a rapid and sensitive method, hTERT in peripheral blood mononuclear cells may have potential use as a biomarker for the early detection of the prognosis of the hydatidiform mole. 展开更多
关键词 FQ RT-PCR Hydatidiform mole TELOMERASE Reverse transcriptase
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部