共查询到20条相似文献，搜索用时 15 毫秒
1.
枇杷果实采后生理与贮藏保鲜 总被引：3，自引：0，他引：3
综述枇杷果实采后生理,涉及果实呼吸速率、乙烯产生、细胞膜透性、主要营养成分构成、果实硬度变化及冷藏果实果肉木质化发生;讨论枇杷果实耐贮运品种选择,采前田间管理,采收,选别和分级,包装和贮藏保鲜技术;并指出枇杷今后需要进一步研究的领域。 相似文献
2.
3.
1-MCP对果实采后生理影响的研究进展 总被引：1，自引：0，他引：1
李会云 《河南职业技术师范学院学报》2011,(5):33-36
综述了近年来1-MCP对采后果实生理和品质影响的研究进展,并阐述了几种影响1-MCP效应的因素;简要介绍了国内外1-MCP应用和发展现状,对调控果实采后生理和品质的方法提出了新的思路. 相似文献
4.
采后枇杷果实品质及相关酶活性变化的研究 总被引：1，自引：0，他引：1
研究了20℃下贮藏过程两个枇杷品种果实品质及相关酶活性的变化。结果表明:解放钟与早钟6号枇杷果实贮藏期间,可溶性固形物和蛋白质含量逐渐下降。在贮藏前10d,果实硬度变化不明显,早钟6号枇杷果实硬度还略有增大现象;贮藏后期,枇杷果实硬度逐渐减小。类胡萝卜素与木质素含量在贮藏期内均表现为先升高后逐渐下降趋势,而在采后前期果实PAL和POD活性均持续增加,与木质素含量变化具有一定的相关性,表明在20℃下PAL和POD在枇杷果实木质素的代谢中起着重要作用。 相似文献
5.
6.
猕猴桃果实采后呼吸作用的研究 总被引：1，自引：0，他引：1
本试验以中华猕猴桃通山5号、武植3号和美味猕猴桃海沃德果实为试材,探讨了猕猴桃果实采后呼吸作用的变化。结果表明:通山5号、武植3号和海沃德果实采后都有明显的呼吸高峰,且不同品种、不同成熟度的果实呼吸强度有明显差异,呼吸高峰出现时期亦不同。采收时果实成熟度越高,呼吸强度越大,呼吸高峰亦越早。以研究结果看,猕猴桃属明显呼吸跃变果实。 相似文献
7.
菜心是华南地区主要生产的蔬菜之一,但其病虫害严重,贮藏时间短、采后黄化和腐烂损失大等原因影响了菜心的生产与贮藏保鲜。本研究采用不同浓度的茉莉酸甲酯溶液对菜心种子进行浸泡处理,与对照相比,经茉莉酸甲酯处理的菜心在生长期间虫害指数低,根冠比有所提高;在采后2 oC贮藏期间切口腐烂率和叶片黄化率有一定程度降低,其中以浓度为1μmol/L的茉莉酸甲酯处理效果最明显。 相似文献
8.
我国番荔枝采后生理研究进展 总被引：3，自引：0，他引：3
对番荔枝果实的生物学特性、采收成熟度、采后形态变化、采后贮藏期间呼吸强度、乙烯释放量、果肉组织pH值、细胞膜透性、酶活性以及贮藏适温进行了综述，并提出今后番荔枝采后研究的方向． 相似文献
9.
1-甲基环丙烯在果蔬采后生理与保鲜上的研究 总被引：3，自引：0，他引：3
1-甲基环丙烯(1-MCP)是一种新型乙烯抑制剂,能不可逆地结合到细胞的乙烯结合位点上,有效地抑制植物对内源或外源乙烯的敏感性,在园艺商业上具有很大的潜在应用价值.本文综述了1-MCP在水果、蔬菜采后与贮藏保鲜基础研究和应用研究方面的进展,并探讨了1-MCP在生产上应用时应注意的问题及其前景. 相似文献
10.
Yu-ying Zhao Chun-lu Qian Ji-cheng Chen Yan Peng Lin-chun Mao 《Journal of Zhejiang University. Science. B》2010,11(6):443-450
This study was to investigate the responses of phospholipase D (PLD) and lipoxygenase (LOX) to mechanical wounding in postharvest
cucumber (Cucumis sativus L. cv. Biyu-2) fruits. Membrane-associated Ca2+ content, activities and gene expression of PLD and LOX, and contents of phosphatidylcholine (PC), phosphatidylinositol (PI),
and phosphatidic acid (PA) were determined in cucumber fruits following mechanical wounding. Results show that PLD and LOX
activities increased with the PLD and LOX mRNAs which are upregulated upon wounding, while membrane-associated Ca2+ content decreased. Accompanying with the increase of PLD and LOX activities, accumulation of PA and losses of PC and PI were
observed in all fruits, but there were differences of degrees between wounded and control fruits. Results suggest that PLD
and LOX might be the main hydrolytic enzymes of phospholipids in postharvest cucumber fruits participating in the mechanical
wounding injury. The activation of PLD and LOX might be the result of gene expression, which could be stimulated by the Ca2+ flowing from the membrane to the cytoplasm upon receiving the wounding signals. 相似文献
11.
12.
研究了低温对杨梅果实采后生理和贮藏效果的影响.结果表明,与常温对照相比,低温(4℃)抑制了果实呼吸强度,减缓了果实细胞膜透性的增加,延缓杨梅果实总可溶性固形物、维生素C、有机酸等含量的下降,显著提高好果率,说明低温能抑制杨梅采后的衰老腐烂,有利于保持果实品质和延长贮藏期. 相似文献
13.
The multi-billion dollar US tree nut industries rely heavily on methyl bromide fumigation for postharvest insect control and are facing a major challenge with the mandated cessation by 2005 of its use for most applications. There is an urgent need to develop effective and economically viable alternative treatments to replace current phytosanitary and quarantine practices in order to maintain the competitiveness of US agriculture in domestic and international markets. With the reliable heating block system, the thermal death kinetics for fifth-instar codling moth, Indianmeal moth, and navel orangeworm were determined at a heating rate of 18℃/min. A practical process protocol was developed to control the most heat resistant insect pest, fifth-instar navel orangeworm, in in-shell walnuts using a 27 MHz pilot scale radio frequency (RF)system. RF heating to 55℃ and holding in hot air for at least 5 min resulted in 100% mortality of the fifth-instar navel orangeworm. Rancidity, sensory qualities and shell characteristics were not affected by the treatments. If this method can be economically integrated into the handling process, it should have excellent potential as a disinfestation method for in-shell walnuts. 相似文献
14.
Qian Xu Cong-yi Zhu Ming-shang Wang Xue-peng Sun Hong-ye Li 《Journal of Zhejiang University. Science. B》2014,15(2):116-124
Penicillium digitatum is the most important pathogen of postharvest citrus. Gene targeting can be done in P. digitatum using homologous recombination via Agrobacterium tumefaciens mediated transformation (ATMT), but the frequencies are often very low. In the present study, we replaced the Ku80 homolog (a gene of the non-homologous end-joining (NHEJ) pathway) with the hygromycin resistance cassette (hph) by ATMT. No significant change in vegetative growth, conidiation, or pathogenicity was observed in Ku80-deficient strain (ΔPdKu80) of P. digitatum. However, using ΔPdKu80 as a targeting strain, the gene-targeting frequencies for both genes PdbrlA and PdmpkA were significantly increased. These results suggest that Ku80 plays an important role in homologous integration and the created ΔPdKu80 strain would be a good candidate for rapid gene function analysis in P. digitatum. 相似文献
15.
Young Soo Kim Kotnala Balaraju Yongho Jeon 《Journal of Zhejiang University. Science. B》2016,17(12):931-940
In this study, plant growth-promoting rhizobacteria (PGPR) were evaluated as potential biocontrol agents against postharvest pathogens of apple fruits. In vitro bioassays revealed that, out of 30 isolates screened, isolates APEC136 and APEC170 had the most significant inhibitory effects against the mycelial growth of several fungal pathogens. Analysis of 16S ribosomal RNA (rRNA) sequences identified the two effective isolates as Paenibacillus polymyxa and Bacillus subtilis, respectively. The two strains showed greater growth in brain-heart infusion broth than in other growth media. Treatment of harvested apples with suspensions of either strain reduced the symptoms of anthracnose disease caused by two fungal pathogens, Colletotrichum gloeosporioides and Colletotrichum acutatum, and white rot disease caused by Botryosphaeria dothidea. Increased productions of amylase and protease by APEC136, and increased productions of chitinase, amylase, and protease by APEC170 might have been responsible for inhibiting mycelial growth. The isolates caused a greater reduction in the growth of white rot than of anthracnose. These results indicate that the isolates APEC136 and APEC170 are promising agents for the biocontrol of anthracnose and white rot diseases in apples after harvest, and suggest that these isolates may be useful in controlling these diseases under field conditions. 相似文献
16.
黄欣荣 《赣南师范学院学报》2006,27(4):10-15
古代技术是带有神秘色彩的附魅技术,但自从它与现代科学相互结合后,就走上了祛魅的道路。祛魅是现代技术的主要特征,但祛魅后的现代技术在给人类带来丰富的物质享受的同时,也带来了人类精神的匮乏以及人与自然的尖锐矛盾。后现代的技术必须采用人、技术、自然协调发展的生态自然观,走技术返魅的道路。 相似文献
17.
从技术角度来看远程教育本身并不是一种新的技术,而是直接应用音频、视频压缩编码技术,卫星广播技术,网络技术,接入技术,视频会议技术,Web技术,广播和组播技术,流技术,数据库技术,多媒体课件制作技术等现代通信和信息处理技术,实现现代远程教育的目标 相似文献
18.
Feng Liu Albert D. Ritzhaupt Kara Dawson Ann E. Barron 《Educational technology research and development : ETR & D》2017,65(4):795-813
The purpose of this research was to design and test a model of classroom technology integration in the context of K-12 schools. The proposed multilevel path analysis model includes teacher, contextual, and school related variables on a teacher’s use of technology and confidence and comfort using technology as mediators of classroom technology integration. Data were collected from 1235 K-12 teachers, who were located in 336 schools in 41 districts across the state of Florida. The results suggest that a teacher’s experience with technology significantly influenced his or her classroom technology integration. Access to technology in classrooms and the availability of quality technology support were related to classroom technology integration. In addition, how frequently a teacher uses technology and his or her confidence and comfort using technology were mediators for classroom technology integration. These results provide preliminary evidence that the proposed model is both useful and relevant in explaining classroom technology integration in K-12 schools. 相似文献
19.
Sara G. Crocker 《Technology, Pedagogy and Education》2019,28(1):37-52
The saturation of technology in learning environments can create feelings of apprehension in students who are not technologically savvy, especially for community college students who may meet basic expectations for technology use. Despite the infusion of communication technology into higher education, the effects of incorporating this technology in community college classrooms, particularly developmental education courses, remain to be thoroughly studied. Developmental education students enrolled at a multi-campus community college in the southeast of the United States completed a survey containing measures of technology apprehension and achievement emotions. Positive associations among students’ technology apprehension and negative achievement emotions were detected. No significant associations were detected between technology apprehension and the positive achievement emotions of enjoyment, hope and pride. This implies that technology may not play as significant a role in course satisfaction as popular opinion might assume. Data from open-ended questions offered insight into the ways developmental education students view technology and the challenges they face when using technology in their academic pursuits, including concerns related to technology access (i.e. the digital divide). Community college students expect technology in the classroom; however, more research is needed to determine exactly how much and what kind of technology they expect in a specific learning setting. 相似文献
20.
罗贵斌 《福建工程学院学报》2014,(3):296-301
利用“中国科协专利数据库”对1998~2012年美国电气技术领域专利申请进行检索分析。本研究以电气技术一级技术领域、二级技术领域和IPC三个层面的专利指标为基础,分析判断美国电气技术发展趋势。发现美国电气技术发展与经济环境和创新思路关联较大,近年来美国电气技术领域的专利申请主要以电网智能化为目标,主要专利热点分布在电机与电器、通信技术与信息化技术领域。 相似文献