Seasonal variation in pigmentation and anthocyanidin phenetics in commercial Eustoma flowers   总被引：2，自引：0，他引：2  

A. F. M. Jamal Uddin  Fumio Hashimoto  Toshiki Miwa  Katsuhiro Ohbo  Yusuke Sakata 《Scientia Horticulturae》2004,100(1-4):103-115

The seasonal change in petal color and pigmentation of 29 commercial Eustoma cultivars was studied. The flowers are basically divided into four groups according to the major anthocyanidin phenotype in association with petal coloration, i.e., delphinidin (Dp)-based (purple flower), cyanidin (Cy)-based (reddish purple flower), pelargonidin (Pg)-based (pink flower), and none (white flower) groups. The constitution of petal anthocyanidins was not changed by forcing treatment in most of the flowers. Lightness (L^*) and chroma (C^*, color saturation) showed a change along with the increase/decrease of hue angle difference (ΔH^*), thus simultaneously the chromatic tonalities tended to move to redder and bluer, respectively. Floral pigment clustering described two flower groups in a dendrogram, based on anthocyanidin constitutions as phenetic markers, which are apparently the Dp- and Pg-based phenotypes of anthocyanidin syntheses. The Cy-based flowers made a subcluster with the Pg-based flowers, indicating a close relationship in the biosynthesis of the two anthocyanidins, and suggesting the Dp- and Pg-syntheses complement one another.  相似文献   

保定市一亩泉河河流中COD的变化及污染源分析     

班西雨  杜忠文  王世杰  王建伟  田祖光 《绿色科技》2020,(4):27-29

针对保定市城区水系管理委员会2017年3月公布的黑臭水体河流中的一亩泉河7.23km的黑臭水体段为参考进行了勘查、取样与COD实验工作,从2019年4月12日到2019年5月29日进行了为期一个半月的时间。研究结果表明:保定市一亩泉河河流不同位置COD大小不同、污染原因不同。通过周围景观的变化、对采样点附近居民进行的走访和COD浓度的测定,对一亩泉河的水质状况和污染源进行了全面系统地分析。并为此提出了切实可行、经济有效、便于管理的控制方案。  相似文献   

基于PCA-GA-SVM的甘蔗收获机运行状态识别     

陈远玲  覃东东  孙英杰  高骁卿  班成周  梁云祥 《中国农机化学报》2020,(2):135-140

由于甘蔗收获机在收获过程中智能化水平较低,依靠人工操作很容易对甘蔗收获机的运行状态产生误判,从而造成物流通道堵塞、能源浪费、收割效率低。针对这些问题,提出一种基于主成分分析(PCA)、遗传算法(GA)和支持向量机(SVM)状态识别模型。首先,通过实地采集甘蔗收获机刀盘轴、行走轴、切段轴和风机轴扭矩和行驶速度特征信息,然后通过PCA进行数据降维,最后利用GA优化参数C、γ,使用每个特性信息来训练SVM,对甘蔗收获机运行状态进行分类。结果表明:PCA-GA-SVM状态识别模型对甘蔗收获机运行状态的识别准确率为93.75%,建模时间为3.688 s,与SVM(81.25%,9.487 s)、PCA-SVM(87.5%,5.817 s)和GA-SVM(90%,8.969 s)进行对比,该模型具有最高准确识别率和最快建模速度,具有较大的应用价值。  相似文献   

秦巴山区耕层土壤微量元素空间特征及影响因子——以镇巴县为例   总被引：2，自引：0，他引：2  

姜悦  常庆瑞  赵业婷  班松涛 《中国水土保持科学》2013,(6):50-57

为充分了解与掌握秦巴山区耕层土壤微量元素现状、空间分布规律及其影响因素,为区域土壤微量元素的科学管理及土壤微肥应用提供理论依据和实践指导,以镇巴县为例,基于2010年陕西省耕地地力调查与质量评价项目数据,采用地统计学和GIS相结合的方法,研究秦巴山区耕层土壤有效态Fe、有效态Mn、有效态Cu和有效态Zn的空间特征及其影响因素.结果表明：1）镇巴县耕层土壤有效态Fe、Mn和Cu均属中等变异强度,变异系数介于81.38％～97.57％之间,有效态Zn属强变异强度,变异系数为117.09％;2）空间特征上,根据块金系数值,4种微量元素均表现为中等强度的空间相关性,县域质量分数的空间分布呈南部高、西部低格局,空间变异性是由自然因素（土壤理化性质、地形地貌和常年降水量等）和人为因素（作物熟制和村距等）共同作用而引起的;3）镇巴县耕层土壤整体有效态Cu和Fe质量分数丰富,Zn质量分数适宜,19.14％ Mn缺乏（＜5 mg/kg）,需结合不同的耕作制度、土壤类型及其质量分数丰缺水平进行分区培肥与管理.  相似文献   

Comparison of flower color with anthocyanin composition patterns in evergreen azalea   总被引：2，自引：0，他引：2  

Daiki Mizuta  Takuya Ban  Ikuo Miyajima  Akira Nakatsuka  Nobuo Kobayashi   《Scientia Horticulturae》2009,122(4):594-602

In evergreen azaleas, major anthocyanins were detected from petals of wild species and cultivars by HPLC analysis. Depending on flower color, all samples were divided into three groups: red, purple or white, using the Japan color standard for horticultural plants. The chromatic components a* and b* values of red group samples showed a convergent distribution, whereas those of purple group samples showed a wider distribution. According to the HPLC analysis, red group samples had two to four major anthocyanins, and those of the purple group had two to six major ones. In contrast, no anthocyanins were detected in the white group petals, although anthocyanidins were detected. These results suggest that the anthocyanin constitution of the purple group flowers is more varied than that of the red group flowers, and this wider variety among purple flowers contributes to extending the diversity of flower color in evergreen azalea.  相似文献   

高精度气动比例压力阀设计与特性分析   总被引：3，自引：1，他引：2  

路波  陶国良  袁月峰  刘昊  班伟 《农业机械学报》2009,40(10):181-187

设计了一种两级阀芯活塞式结构的以比例电磁铁为控制元件,采用电反馈闭环控制的高精度气动比例压力阀。该阀输出压力在0.6MPa内连续可调,且稳态精度可达0.25 kPa。建立了比例阀完整的非线性动态模型,分析了主要物理和几何参数对系统动态特性和控制性能的影响;构建了输出因子调整的模糊自适应比例加积分控制器,并利用ATmega16单片机实现了压力在设定范围内的快速高精度控制。实验结果表明,该阀在设计压力范围内具有良好的压力和流量特性;和传统PI算法相比,输出因子调整的模糊自适应算法在改善系统响应和控制稳定性的同时,显著提高了稳态控制精度,具有较高的效率和鲁棒性。  相似文献   

Effects of testosterone on rat placental development     

Satoshi Furukawa  Naho Tsuji  Seigo Hayashi  Yusuke Kuroda  Masayuki Kimura  Chisato Hayakawa  Kazuya Takeuchi  Akihiko Sugiyama 《Journal of toxicologic pathology》2022,35(1):37

We investigated the morphological effects of testosterone on placental development in a rat model of polycystic ovarian syndrome (PCOS). Testosterone propionate (TP), which was subcutaneously administered to pregnant rats with 5 mg/animal from gestation day (GD) 14 to GD 18, induced a maternal weight reduction without mortality or clinical signs from GD 19 onwards. A decrease in fetal and placental weight, an increase in intrauterine growth retardation (IUGR) rates, and histological changes in the placenta were observed on GD 21 but not on GD15 or 17. Histopathologically, on GD 21, the trophoblast septa thickened, and the maternal sinusoids were narrowed in the labyrinth zone, resulting in a small placenta. Additionally, the placental weight, thickness, and histological morphology in the labyrinth zone on GD 21 in the TP-treated group were nearly identical to those on GD 17 in the control and TP-treated groups. Therefore, it was assumed that the testosterone-induced small placenta was induced in association with the developmental inhibition of the fetal part of the placentas from GD 17 onwards.  相似文献   

帽儿山林场樟子松人工林光辐射分布的研究   总被引：1，自引：0，他引：1  

班宏娜  刘兆刚 《森林工程》2010,26(2):20-23

以东北林业大学帽儿山实验林场老山施业区内的樟子松人工林为研究对象,运用WinSCANOPY2006a冠层分析仪采集数据,并结合实地调查,实测5种林龄的樟子松人工林群落内光辐射特征及冠层参数。结果表明：立地条件基本一致的情况下,樟子松人工林内光辐射随林龄增大呈下降趋势,变化范围为8．8－12．32mol·m^-2·d^-1,平均占冠层顶部总辐射的21．21％。对光的吸收能力逐渐增强且树龄为30a以后趋于稳定。林分开阔度的变化范围为10．78％～21．66％,不同林龄群落之间差异显著,随林龄增大而下降。叶面积指数变化范围为2．29～3．47,不同林龄群落之间差异不显著。消光系数（＆）的变化范围为0．47～0．63,消光能力随林龄增大而增强,冠层结构随林龄的变化对消光能力的变化有一定得影响．  相似文献   

Differences between carcass grades in some morphological, behavioral and physiological measurements at early and middle stages of fattening in crossbred steers     

Katsuji UETAKE  Toshie ISHIWATA  Naoshige ABE  Yusuke EGUCHI  Toshio TANAKA 《Animal Science Journal》2005,76(6):581-586

The differential variables for carcass grades were identified from morphological, behavioral and physiological measurements of young steers at a commercial farm. Thirty‐five Japanese Black × Holstein steers aged 6–10 months were randomly assigned to three pens. The steers had free access to ryegrass hay and a restricted amount of concentrate diet for the first 6 months of trial. They were then given oat straw ad libitum and an additional concentrate diet until slaughter. Behavioral observations (15 categories) were carried out once every 2 weeks for 2 h after feeding. Bodyweight was measured, blood sampled (for seven metabolic hormones and five metabolites), ultrasonic scanning conducted and physical measurements taken (10 parts for each animal) in months 1, 3 and 5 (early fattening stage, EFS) and in months 7, 9 and 11 (middle fattening stage, MFS) of the trial. Temperament scores during these procedures, entry order into restraint stalls, social rank and average daily gain were also assessed. A factor analysis and one‐way anova were used to identify clusters of variables which had different factor scores between carcass grades. As for the carcass yields, a cluster of chest girth and depth, bodyweight, withers and hip height, and rump length (P < 0.01), and a cluster of the frequency of scratching the body with facilities (P < 0.05) were identified as differential variables in the EFS. In the MFS, a cluster of concentrations of cortisol and epinephrine, and the frequency of eating straw were identified (P < 0.10). As for the carcass quality grade, a cluster of social rank, triglyceride concentration and the frequencies of stand‐chewing cud and eating hay, and a cluster of the frequency of investigating facilities (both P < 0.10) were identified in the EFS. In the MFS, a cluster of hip height, bodyweight, cannon circumference, chest depth, withers height and chest girth, and a cluster of the frequencies of eating a concentrate diet and stand‐chewing the cud, and social rank (both P < 0.10) were identified. In conclusion, bodyweight, chest girth and depth, withers and hip height were identified as good differential variables for future carcass grades of young steers. Facility enrichment that encourages steers to eat hay in the EFS, and to eat a concentrate diet in and after the MFS would be effective in upgrading carcass grades. High incidence of investigating and scratching the body with facilities and stand‐chewing the cud might lead to lower carcass grades.  相似文献   

Effect of ethephon (2-chloroethylphosphonic acid) on the fruit ripening characters of rabbiteye blueberry     

Takuya Ban  Mihoko Kugishima  Tsuneo Ogata  Shuji Shiozaki  Shosaku Horiuchi  Hisafumi Ueda 《Scientia Horticulturae》2007

Effect of ethephon (2-chloroethylphosphonic acid) application on rabbiteye blueberry fruit quality during the growth period was investigated. Ethephon treatment stimulated the decrement of titratable acidity, anthocyanin accumulation and fruit softening 4 days after treatment and the promoting effects continued through the investigation period. The ripening promotion effect of ethephon on total soluble solids content was observed only 8 days after treatment. Ethephon treatment did not affect the fruit enlargement during the investigation period. From these results, it is concluded that ethephon application for rabbiteye blueberry promote the fruit ripening, but the stimulatory effects of ethephon on fruit ripening were different in degree on each ripening characters.  相似文献