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VC++实现CAD绘图程序开发的底层关键技术研究 被引量:5
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作者 王笑 刘智强 张克华 《新技术新工艺》 2011年第5期52-54,共3页
介绍了用VC++6.0开发二维CAD绘图程序中涉及到的一些核心技术,如橡皮线技术、特征点捕捉的算法及实现过程。这些技术对于实现图形系统的智能化,以及用户与系统的交互性方面,都有着很高的实用价值。
关键词 橡皮线 捕捉 重画 链表
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运用价值工程电线成本大幅度下降
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作者 马世寰 《工业技术经济》 1985年第1期19-24,共6页
推广使用现代化管理手段是内涵挖潜的有效措施。吉林市电线厂首先选定应用价值工程来降低电线成本,提高了企业的经济效益,改变了企业的面貌。
关键词 价值工程 护层 内涵挖潜 选择价值 现代化管理手段 线芯 铝芯橡皮线 比例关系 功能分析 范围规定
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Molecular Cloning and Bioinformatical Analysis of a cDNA Encoding Mitochondrial 50S Ribosomal Protein L21 from Hevea brasiliensis Muell. Arg.
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作者 邹智 杨礼富 《Agricultural Science & Technology》 CAS 2012年第6期1203-1206,共4页
[Objective] "Tapping panel dryness (TPD)", a syndrome known as tapping incision blocked partly or entirely during latex exploiting, has become the most important factor causing great losses for rubber production. ... [Objective] "Tapping panel dryness (TPD)", a syndrome known as tapping incision blocked partly or entirely during latex exploiting, has become the most important factor causing great losses for rubber production. Aiming to elucidate the molecular mechanism of tapping panel dryness occurrence, this study carried out molecular cloning and bioinformatical analysis of a mRPL21 cDNA sequence, a gene associated with TPD. [Method] In a preliminary study, an expressed sequence tag (EST) encoding a deduced protein homologous to mitochondrial 50S ribosomal protein L21 (mRPL21), which showed to be down-regulated in the latex of TPD-affected rubber trees, was isolated by suppression subtractive hybridization (SSH). After ESTs assembling and RT-PCR validation, an 853 bp cDNA sequence with an open reading frame (ORF) was cloned, which was named as HbmRPL21 under GenBank accession number of HM230670. [Result] Bioinformatical analysis suggests that HbmRPL21 encodes a deduced polypeptide of 271 amino acids with a theoretical molecular weight (Mw) of 30.52 kDa and isolectric point (pI) of 8.40, and HbmRPL21 is a mitochondrion-targeted protein with a conserved domain of Ribosomal_L21p involving translation. Homology analysis reveals high amino acid sequence identity of mRPL21 from plants, while diversity of that between plant and animal kingdom. [Conclusion] This study laid the basis for further revealing the biological functions of mRPL21 in TPD-affected rubber trees. 展开更多
关键词 Hevea brasiliensis Tapping panel dryness syndrome Mitochondrial 50S ribosomal protein L21
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