Catastatic pathways of adenosine monophosphate in failing cardiac myocytes of patients with congenital heart disease()

AIM:To study the metabolic pathways of adenosine monophosphate (AMP) in the chronic failing cardiac myocytes of patients with congenital heart disease (CHD). METHODS:RESULTS:There was no significant statistic difference among the contents of AMP in three groups (P≥0. 05). The concentration of Ado was lower in the group C (P≤0. 05) and the concentration of IMP was higher significantly (P≤0. 05). There was a significant increase in the ratio of IMP/Ado in the three groups. Negative relationship was found between pre-operative EF of left ventricle and IMP/Ado (K constant). The higher K constant was, the higher incidence of post-operative heart failure would be. CONCLUSION: The metabolic pathway of AMP in the failing cardiac myocytes of CHD may go along with the way to create more IMP. The lower of pre-operative ejection fraction of left ventricle indicates the abnormal change of AMP catabolism, post-operation heart failure may be an important complication in these patients.     

基于灰度截留分割与十色模型的马铃薯表面缺陷检测方法

为探索基于计算机视觉的马铃薯表面缺陷检测新方法,该研究提出能将马铃薯表面疑似缺陷一次性分离出来的快速灰度截留分割方法和用于缺陷识别的十色模型。选择面积比率和十色比率作为缺陷判别特征,对分割出来的深色部位采用阈值法进行缺陷识别。采用基于快速G与亮度截留分割的2种方法对发芽进行识别。通过对326个马铃薯样本的652幅正反面图像进行试验,基于十色模型的缺陷识别方法对分割出来的深色区域的正确识别率为93.6%,基于快速G与亮度截留分割2种方法结合对有芽体图像的正确识别率为97.5%,马铃薯表面缺陷正确检测率为95     

Induction of centrum defects in amberjack Seriola dumerili by exposure of embryos to hypoxia

ABSTRACT:   Artificially hatched Seriola species have the problem of malformation, mainly in their vertebrae, head, and mouth parts. To clarify the cause of vertebral malformation, the effects of hypoxia during embryogenesis on the induction of centrum defects was investigated in artificially hatched amberjack Seriola dumerili . Firstly, 7-somite stage embryos were exposed to waters of 0, 12.5, 25, 50, and 100% dissolved oxygen (DO) for 0.5, 1, 2, 3, 4, and 5 h to confirm the effective dose (DO concentration and duration of exposure) of hypoxia that induces somitic disturbances in newly hatched larvae. Exposure of embryos to 12.5% DO concentration for longer than 0.5 h induced somitic disturbances. Following this result, centrum defects in juveniles were investigated by an induction experiment with embryos exposed to 12.5% DO for 2 h at the gastrula, 1- or 2-somite, 10-somite, 15-somite, or heart beating stage. This experiment revealed that centrum defects were induced only during somitogenesis, and somitic disturbances were the premonitory symptom of centrum defects. These results indicate hypoxia during somitogenesis as a possible cause of centrum defects in amberjack.     

机器视觉在水果缺陷检测中的研究现状

随着我国加入WTO,提高农产品质量和国际竞争力能力是当务之急。为此,对机器视觉在水果缺陷检测进行较为全面地论述。首先简单地介绍了机器视觉在水果分级检测中的重要性,并分别从国内和国外两个方面描述了机器视觉在水果缺陷研究中的最新进展,指出了当今国内外研究中存在的问题和今后进一步研究的设想。     

木质材料表面缺陷计算机视觉测量的识别方法

可应用于传送线与计算机联合处理识别图象，算法输出列出了便于进一步高水准处理识别目标象素的坐标。它为木质材料表面缺陷计算机视觉测量技术提供了一种有效的识别方法。     

基于高光谱成像技术的灵武长枣缺陷识别

为研究快速识别灵武长枣表面裂痕、虫眼、碰伤等常见缺陷的有效方法,利用特征波长主成分分析法结合波段比算法进行长枣裂痕、虫眼、碰伤识别。首先,采用近红外(Near Infrared Reflection,NIR)波段范围的高光谱成像系统获取300个长枣反射图像,提取并分析各类型长枣光谱曲线,选择918~1 678 nm波段范围进行主成分分析,通过权重系数提取特征波长;然后,对特征波长下图像进行主成分分析,选择最优的主成分图像进行识别;最后,对未识别的长枣图像采用波段比算法进一步进行识别。NIR波段的正常枣、虫眼枣、裂痕枣、碰伤枣的识别率分别100%、90%、86%、100%。结果表明:NIR高光谱成像仪对长枣外部缺陷识别是可行的,为多光谱成像技术应用于在线检测长枣品质提供了理论依据。     

农产品品质无损检测技术应用研究

研究目标是开发一种用可见光和近红外光谱(Vis/NIR)检测农产品的非破坏性测定方法。用波长范围为310～1 100nm的可见/近红外分光仪得到枣的光谱测量数据,用于测定交互作用下的枣的内部可溶性固体含量和基于反射系数的枣的表面缺陷;用多元线性回归校准模型来预测可溶性固体含量,校正判别分析判断大枣有或没有表面缺陷。     

THE EFFECT OF SEQUENCE SELECTION AND FIELD STRENGTH ON DETECTION OF OSTEOCHONDRAL DEFECTS IN THE METACARPOPHALANGEAL JOINT

Six cadaver forelimbs were imaged in two high‐field magnetic resonance (MR) systems and one low‐field MR system following the creation of osteochondral defects on the palmar distal aspect of the third metacarpal bone. The following sequences were performed using all three systems: proton density (PD) turbo spin echo, T2^* gradient echo (GRE), T2‐weighted fast spin echo, and short tau inversion recovery. In addition, 3D T1 GRE sagittal standard and motion insensitive sequences were obtained using the low‐field system. PD fat saturated and 3D T1‐weighted spoiled GRE images with and without fat suppression were acquired with the high‐field systems. Lesions were measured and assigned a confidence score. The images obtained using high‐field systems (1.0 and 1.5 T) more accurately represented the osteochondral defects when compared with low‐field system (0.27 T) images. The largest difference was observed when evaluating articular cartilage defects, which were not identified on the low‐field images. Sequence selection affected the appearance of the lesions. On all systems the turbo and fast spin echo sequences more accurately represented the lesion size and shape when compared with the GRE sequences. The T1 GRE sequence is the only sequence that appears to allow visualization of the articular cartilage on the low‐field images, but is limited in providing adequate cartilage visualization. Confidence scores were greater on the high‐field systems when compared with the low‐field system.