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长期以来,鲜切花由于受到新鲜度、时效性 等因素的影响,长途运输损耗较大,即使空运,损耗也在40%以上,而且运输成本较高。为了提高我国鲜切花运输质量和降低成本,中国农业大学观赏园艺系经过5年多的深入研究,解决了切花保鲜的问题,实现了利用火车运输的目标。其措施就是控制鲜切花采收时期、采后进行处理,在运输过程中采用降温和驱除有害气体等。 相似文献
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为了解伊犁马经长途运输过程中的血液生理生化指标的动态变化规律,本试验选用6匹雄性伊犁马,进行路程400 km,历时480 min的长途运输,并分别于上车运输前、中、后等8个时间点采集颈静脉血进行血液指标的检测。结果显示:与上车前相比,在运输4 h时马血液中红细胞总数(RBC)、淋巴细胞比率(LYM%)显著下降(P<0.05),粒细胞(GRAN)和粒细胞比率(GRAN%)显著上升(P<0.05);三碘甲腺原氨酸(T3)、四碘甲腺原氨酸(T4)、生长激素(GH)、皮质醇(COR)、白蛋白(ALD)、胆固醇(CHOL)在运输6 h均显著升高(P<0.05),红细胞压积(HCT)、尿素(UREA)在运输6 h显著下降(P<0.01)。长途运输过程可使马血液指标产生反应并使血液指标呈现先升后降的变化规律,变化的峰值主要出现在运输6 h时,上述指标可作为判定马产生运输应激的关键指标。 相似文献
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《农产品加工.学刊》2021,(13)
采用智能控制仿天然风干和烘烤干燥加工腌腊高原冷水鱼,比较不同干燥方式对产品水分含量、水分活度、硫代巴比妥酸值(Thiobarbituric acid value,TBA)、色泽、质构特性及挥发性风味物质的影响。结果显示,2种干燥方式对水分活度与水分含量无显著差异(p0.05),烘烤风干组硫代巴比妥酸值(TBA)显著更高(p0.05)。仿天然风干产品色泽红亮,硬度较小,弹性更好。2组共检出挥发性风味物质31种,Ⅰ组检出24种,相对含量90.42%;Ⅱ组检出22种,相对含量为94.25%,挥发性风味物种类和对产品风味贡献较大的醛类Ⅰ组显著高于Ⅱ组,表明仿天然风干条件有利于腌腊高原冷水鱼整体风味物质的形成,可为高原冷水鱼的产品研发提供新思路。 相似文献
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现代包装技术在鲜花保鲜中的应用 总被引:1,自引:0,他引:1
正近年来,我国鲜切花需求增长迅猛,并形成了种植、采集、处理、运输、贮藏、销售为一体的产业化运营链。由于切花在运输至销售过程中极易衰老、腐烂,造成商品价值丧失。因此,包装的保鲜作用极为重要。从包装的最初意义来看,包装是在流通中保护产品,方便储运、促进销售的容器,这一观点在包装技术发展迅速的今天仍是大多数,尤其是中小花农对 相似文献
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介绍了运用冷冻干燥技术进行速溶蛋花汤的加工,研究了生产工艺、特点以及影响产品质量的主要因素。试验表明,采用冷冻干燥技术加工的速溶蛋花汤,具有营养丰富、风味独特、方便快捷等特点。 相似文献
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DENG Zhao-jing 《保鲜与加工》2005,(1):153-156
A new definition of inertia,i.e. the momentum is the measuring of inertia of matter, is proposed. The article through and etc., subjects, the correctness of the new notion of inertia:The monentum is the measuring of inertia has been demonstrated, and the unsolved contradictions of the traditional definition of inetia. And the mass is the measuring of inertia has been revealed. 相似文献
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Automobile comfort dynamic simulation is necessary when we predict and evaluate the comfort of a automobile or optimize performance of automobile. The nine DOF vibration model of automobile is established , which acts root mean square value of body in multiple work conditions as comfort evaluation indices. Based on the comfort simulation, the Hongyan 1160 is predicted in the way of comfort. The programmes can be used in many different automobiles . The computational result indicates that the model can simulate vibration of automobile truly. It is significant to research automobile comfort evaluation to optimize performance of automobile and comfort simulation .The computational program can be applied to optimize or simulate which has some reference value. 相似文献
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香蕉是热带亚热带发展中国家重要的粮食作物和碳水化合物来源。但近年来,香蕉生产受到严重的病虫危害。大多数香蕉栽培品种是三倍体,生长周期长,而且不孕。由于没有种子,给繁殖和育种带来一定的困难。遗传转化技术的发展为香蕉品种的改良提供了一种有效的手段。香蕉的遗传转化方法有电激法、基因枪法、农杆菌介导法等。农杆菌介导法的应用是香蕉品种改良的一个重大突破。香蕉遗传转化的外植体也发展到多种,有原生质体,胚性细胞悬浮系,分生组织,以及横切薄片等。近几年,随着分子生物学的发展,出现了转化效率更高,重复性更好的香蕉遗传转化技术。如农杆菌和基因枪结合法,离心辅助农杆菌介导法、真空渗透技术等。这些新技术新方法的出现,必将推动香蕉产业高速发展。 相似文献
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基于RS与GIS技术,利用景观生态学理论及景观格局指数对布尔津县土地利用现状进行定量分析。结果显示为:(1)布尔津县以草地、林地为主要景观类型,镶嵌着耕地、水域等景观类型。(2)四个分区(即高山区、丘陵区、平原区、荒漠区)的林地资源组成差异明显,耕地、居民、交通及工矿用地集中分布在丘陵区和平原区(3)从各项指数来看,高山区的多样性指数较低;平原区是受人文因素最多的区域,景观优势度低,各种土地利用类型比例差异不大,有利于生态可持续发展,但要合理的开发利用;荒漠区生态环境相对脆弱,要加强生态环境的保护与改善。通过该研究对布尔津县的土地利用现状作一个了解,为该县乃至整个地区的景观规划和可持续发展战略提供科学依据。 相似文献
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Applicability of molecular markers in the context of protection of new varieties of cucumber 总被引:2,自引:0,他引:2
G. P. Bernet S. Bramardi D. Calvache E. A. Carbonell M. J. Asins 《Plant Breeding》2003,122(2):146-152
The growing number of candidate varieties presented every year at each national Plant Variety Protection Office and their decreasing genetic variability forces strategies to be adopted that will reduce costs without losing rigour when deciding about the acceptance or rejection of a candidate variety. Molecular markers have been envisaged as a reliable tool to establish differences, but can molecular markers be used for assessing distinctness? A comparison between a molecular and a morphological characterization of 41 seed samples belonging to 36 cucumber varieties and including several external controls has been carried out to investigate the applicability of molecular markers in the context of distinctness, uniformity and stability (DUS) tests and the protection of new varieties. Both types of character indicate the same relationships among main groups, Dutch and Beth‐Alpha types, and Gerking and Slice types, the correlation between distance matrices being only 0.6489. Varieties considered uniform for morphological traits proved not to be so for molecular markers. Therefore, molecular characterization is not offering the same estimates of uniformity and relatedness between varieties as does morphological characterization. External controls were used to establish distinction limits with morphological and molecular dendrograms to focus on those varieties, which were suspiciously similar. The results with cucumber show that molecular identity could be used to assess any lack of distinctness and so corroborate the morphological assessment of candidate varieties. The morphological trait ‘type’ provides distinct characterization of varieties and the molecular characterization of candidate varieties could be used to design better field experiments to assess distinction within each group of morphological cucumber type. 相似文献
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母猪繁殖障碍成因分析 总被引:3,自引:0,他引:3
繁殖障碍是导致母猪淘汰的最主要因素,直接造成母猪非生产天数延长,繁殖猪群生产效率降低,严重影响猪场的经济效益。本文作者对引起母猪繁殖障碍的多方面因素,包括营养因素(如饲养水平、饲料品质、断奶日龄)、环境因素(如温度、湿度、通风、光照)、疫病因素、生产技术及管理因素进行了详细阐述。 相似文献
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