共查询到20条相似文献，搜索用时 71 毫秒
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以海南"保研-7号"红毛丹为材料,研究不同贮藏温度(2、5、8、13、21℃)对红毛丹果皮褐变及贮藏品质的影响。结果表明,红毛丹在21℃贮藏第7天果皮褐变指数高达0.87,已无商品价值;5℃贮藏能较好地保持红毛丹果皮和果肉品质,显著抑制红毛丹果实呼吸作用及果皮褐变,保持红毛丹果皮和果毛颜色,14 d好果率达89%,较好地保持果实可溶性固形物含量(SSC),降低可滴定酸(TA)含量,保持较高的固酸比和VC含量,抑制细胞膜相对电导率升高。说明5℃为红毛丹果实贮藏适合的温度;8℃贮藏10 d内能够保持果皮和果肉新鲜品质;2℃贮藏7 d果皮颜色迅速褐变,果毛失水严重,出现明显冷害,同时SSC和VC损失增加,固酸比降低,果皮细胞相对电导率明显增加,红毛丹外观品质急剧降低。 相似文献
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研究了在常温（20±1）℃和冷藏（0±0.5）℃条件下澳洲青苹苹果不同采收期对果实采后品质、生理和虎皮病发病率的影响。结果表明,晚采果实的品质和风味相对较好。常温贮藏条件下,晚采果实的乙烯跃变出现时间较早,但采收期对乙烯峰值的大小影响不大,直至果实严重腐烂也未发生虎皮病;冷藏条件下,延迟采收期能明显抑制和延缓澳洲青苹苹果虎皮病的发生,保持果实较高的可溶性固形物含量;贮藏后期早采果实的腐烂率急剧升高是由极其严重的虎皮病造成的。但果实采收越晚,耐贮性越差,腐烂率高而且腐烂出现的时间早,不宜长期贮藏。因此,综合上述因素,建议辽西地区澳洲青苹苹果贮藏果实应于生长发育后期（163～170 d）的10月中下旬采收,常温20℃条件下贮藏30～40 d,冷藏0℃条件下贮藏180 d内,虎皮病发病率低,可保持良好的品质与风味。 相似文献
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为明确用于贮藏的维纳斯黄金苹果果实最佳采收期和最适贮藏温度。研究了3次采收期结合(-1.5±0.5),(0±0.5),(3±0.5)℃3个精准贮藏温度对维纳斯黄金苹果冷藏后20℃货架期果实品质和防褐变保鲜的效应。结果表明,采收期Ⅰ(相对早采)结合-1.5℃(相对低温)贮藏能保持果实较高的硬度,但果实可溶性固形物含量(SSC)低、口感和风味较差,货架期间出现了不同程度的果皮、果心和果肉褐变;采收期Ⅲ(相对晚采)结合3℃(相对高温)贮藏至1月20日,果实SSC高、口感和风味好,但贮藏至3月20日+20℃平衡24 h和货架放置7 d,果肉发绵并严重褐变。结果还表明,与-1.5,3.0℃相比,0℃维持了贮藏后期果实较高的硬度、SSC、可滴定酸(TA)和抗坏血酸含量,并更好地保持了果实叶绿素荧光活力,延缓了果实衰老。对于同一贮藏温度来说,采收期Ⅱ果实的TA和抗坏血酸含量高于采收期Ⅰ、Ⅲ。采收期Ⅱ、Ⅲ结合0,3℃能保持中短期贮藏的维纳斯黄金苹果较好的商品性和内在品质。对于中长期贮藏的维纳斯黄金苹果来说,采收期Ⅱ结合0℃精准温度贮藏,既能有效抑制果实褐变、减缓果实软化衰老,又能维持货架期果实较好的风... 相似文献
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选用八成熟安哥诺李为试材,将果实预冷至0℃后,采用三种保鲜方式进行处理：1 PVC保鲜袋包装,袋内放置高锰酸钾乙烯吸收剂和仲丁胺盐缓释防腐剂;2袋内放置高锰酸钾乙烯吸收剂;3果实置于泡沫箱中,再将泡沫箱装入硅窗保鲜袋内。果实均于（0±0.5）℃的冷库内贮藏100 d,研究不同处理的保鲜效果。结果表明,李果冷藏100 d均未出现腐烂,说明腐烂并不是制约其长期贮藏的主导因素,而严重的果肉褐变和风味下降才是影响安哥诺李长期贮藏的瓶颈;在0℃贮藏70 d之内,三种处理李子的果皮、果肉颜色、风味与入贮前相比虽然有些变化,但并不影响其商品性,能够较好地保持短期贮藏李子的感官品质。总体上,处理1的保鲜效果要优于处理2和处理3,处理3的果实褐变最严重。 相似文献
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贮藏温度对嘎啦苹果贮藏期及货架期品质的影响 总被引：3，自引：0，他引：3
以早熟品种嘎啦苹果为试料,将采后新鲜的嘎啦苹果分别置于0、5、25℃(常温)条件下贮藏,通过对贮藏及货架期间果实各项指标的测定和分析,研究不同贮藏温度对嘎啦苹果采后品质及货架期的影响。结果表明:25℃常温贮藏21 d后,嘎啦苹果果实失去良好的品质,不再具有商品价值;0℃和5℃低温有利于保持果实的硬度和可溶性果胶含量,抑制乙烯释放量和呼吸强度的上升以及腐烂的发生,延缓成熟衰老,较好地保持果实的鲜食品质,且0℃比5℃贮藏的效果好;0℃和5℃低温贮藏28 d后嘎啦苹果的货架期为7 d。 相似文献
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圆黄梨和黄金梨的贮藏保鲜试验研究 总被引：2，自引：0，他引：2
结合新型乙烯抑制剂1-MCP(1-甲基环丙烯)和温度预处理,对圆黄梨和黄金梨的贮藏特性进行试验研究。结果表明,无论是常温贮藏还是冷库低温贮藏,在贮前进行1-MCP处理和适当的温度预处理,都可以显著抑制果实贮藏过程中的软化和可滴定酸含量的下降,使果实的风味和品质好于同期对照,延长果实的贮藏寿命,提高贮藏质量。不同剂量1-MCP处理对圆黄梨和黄金梨果实的保鲜效果无显著差异。过度热处理会加重果实腐烂和褐变,预处理温度以35℃为宜。 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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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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Efficiency of water use of early plantings of sunflower 总被引：4，自引：0，他引：4
M. Auxiliadora Soriano Francisco Orgaz Francisco J. Villalobos Elías Fereres 《European Journal of Agronomy》2004,21(4):465-476
Rain fed crop production in Mediterranean environments depends to a large extent on strategies that avoid the intense summer drought. Early plantings of sunflower have given consistently higher yields in such environments, but the basis for such yield increases has not been explored. We conducted two field experiments at Cordoba (Spain) to investigate the effects of an early and a late planting date on the components of water-limited crop productivity; namely, water use (T), water use efficiency (TE) and harvest index (HI) of sunflower. The results were generalized by simulating rain fed sunflower yields, under early (1 January) and late (15 March) plantings, for a 25-year period with the aid of a simulation model of the Ceres type (OILCROP-SUN) which has been validated in Cordoba. Experimental seed yields of early plantings in 1989 and 1996 were 2.0 and 3.0 t ha−1, while late plantings yields were 1.3 and 2.4 t ha−1, for the 2 years. Average simulated yields were 2.7 ± 1.1 and 1.9 ± 0.7 t ha−1 for early and late plantings, respectively. For the 2 years, T of early plantings was higher than that of late plantings, but the response of TE and HI to planting date was not the same in the two experiments. In the simulation exercise, T and TE of early plantings were consistently higher than those of late plantings, while there were no differences in the HI for the two planting dates. We conclude that early plantings of sunflower increase rain fed yields by increasing both T and TE, while the impact of planting date on HI very much depends on the crop water stress pattern, which is quite variable from year to year even in the predictable Mediterranean environment. 相似文献
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The cotyledon and hypocotyl of eight varieties of alfalfa( Medicago sativa L. )are used to study the effect of different cultivation procedures and genotypes on embryogenic callus and embryoid induction,plant development and transplant of alfalfa.The varieties of alfalfa with high embryoid induction rate and high differentiation rate are screened. A high frequency regeneration system for alfalfa tissue culture is established:which is benifical to the gene transformation of alfalfa. 相似文献
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Based on the relation between the incipient yield pressure and the limit of yielding in cylinder according to the elastic disabled rule, a laboratorial method of determining limit of yielding of material is designed and a set of experimental data were gained by the method. The incipient yield pressure of the cylinder is gained by analyzing the experimental data, and then the limit of yielding is gained. The laboratorial method has a good reliability as the experimental value has a little error to the theory value. It has a definite engineering signification and theory value to research the mechanical capability of material and the disabled rule of high pressure vessel. 相似文献