贮运条件对草莓主要色素成分稳定性的影响     

吕婉莹  贾冬梅  胡云峰  陈君然 《农学学报》2021,11(6):73-77

草莓在贮藏和运输期间会产生褪色现象,花青素含量逐渐减少。为研究光照时间、温度、pH、金属离子对草莓花青素的影响,探索合适的加工与贮运条件,在花青素含量保持一致的情况下设置4种反应条件,探讨光照时间、温度、pH、金属离子对草莓花青素的影响。草莓花青素在自然光下照射8 h,吸光度值下降25%,温度高于60℃后,吸光度值下降67%。当pH>7时,吸光度值下降85%,添加Na⁺、Mg²⁺后的色素提取液反应2 h后所测吸光度值分别保持在0.070和0.050左右,而添加Fe³⁺后测得的吸光度值下降87%。实验结果表明,草莓在贮运过程中应避光、低温、保持酸性条件,且避免与铁制品接触。  相似文献   

Plant–soil interactions in metal contaminated soils     

《Soil biology & biochemistry》2015

The legacy of industrialization has left many soils contaminated. However, soil organisms and plant communities can thrive in spite of metal contamination and, in some cases, metabolize and help in remediation. The responses of plants and soil organisms to contamination are mutually dependent and dynamic. Plant–soil feedbacks are central to the development of any terrestrial community; they are ongoing in both contaminated and healthy soils. However, the theory that governs plant–soil feedbacks in healthy soils needs to be studied in contaminated soils. In healthy soils, negative feedbacks (i.e. pathogens) play a central role in shaping plant community structure. However to our knowledge, the nature of feedback relationships has never been addressed in contaminated soils. Here we review literature that supports a plant–soil feedback approach to understanding the ecology of metal-contaminated soil. Further, we discuss the idea that within these soils, the role of positive as opposed to negative plant–soil feedbacks may be more important. Testing this idea in a rigorous way in any ecosystem is challenging, and metal contamination imposes an additional abiotic constraint. We discuss research goals and experimental approaches to study plant–soil interactions applicable to metal-contaminated soils; these insights can be extended to other contaminated environments and restoration efforts.  相似文献   

不同品系小麦和小黑麦种子中金属元素含量的比较研究   总被引：8，自引：1，他引：8  

吴兆明  王玉琦 《作物学报》1996,22(5):565-567

应用中子活化分析技术，分析了２５个品系小麦和小黑麦种子中的金属元素的含量。检测出１９种元素，其中必需的营养元素９种，重点比较了微量营养元素的含量。结果表明，不同品种上种子中元素一有较大的差异，表明在营养元素的吸收利用上存在着不同的基因型，本实验为有效利用土壤营养元素物小麦育种提供了选择基因型和进行筛选的依据。  相似文献   

金属注射成形技术在喷雾机零件制造中的应用   总被引：1，自引：0，他引：1  

龚洵迪  王大承  田自祥  肖平安 《农业机械学报》2004,35(2):122-125

概述了金属注射成形技术的工艺过程和特点，给出了在喷雾机喷雾头组件这一典型农机零件上的应用实例，并对喷雾头组件用注射成形工艺制造中粘结剂成分的选择、混炼工艺、脱脂方法和烧结过程等进行了探索。通过研究制造出了尺寸精度和力学性能均满足要求的产品，产品致密度达到98．5％。生产工艺得到明显简化。  相似文献   

金属离子对霍山石斛类原球茎增殖及植株再生的影响   总被引：5，自引：1，他引：5  

查学强  罗建平  石玮  姜绍通 《园艺学报》2006,33(1):179-181

 采用单因素浓度试验和正交试验研究了Mg²⁺ 、Ca²⁺ 、Fe²⁺ 、Mn²⁺和Zn²⁺离子对液体培养霍山石斛类原球茎增殖的影响。结果表明, 5种金属离子对类原球茎增殖影响的主次顺序为Fe²⁺ >Mn²⁺ >Mg²⁺ >Ca²⁺ > Zn^{2 +} , 促进类原球茎增殖的优化组合为Mg²⁺ 1.5 mmol·L ^-1、Ca²⁺ 4.5 mmol·L ^-1、Fe²⁺ 0.1 mmol·L ^-1、Mn²⁺ 0.5 mmol·L ^-1、Zn²⁺ 0.06 mmol·L ^-1。经优化的液体培养基增殖的类原球茎能保持植株再生能力, 平均每克类原球茎增殖后可再生植株1 985.2株, 是相同时间内对照类原球茎再生植株数的4.2倍。  相似文献   

浅谈我国农田土壤重金属污染现状及修复研究          下载免费PDF全文

朱雅琪 《现代农业科技》2024,(5)

农田土壤重金属污染导致农作物重金属含量超标,这些重金属随食物链进入人体内,对人体健康造成危害。了解农田土壤重金属污染现状、重金属污染对农作物的危害,以及污染农田的治理修复,对维护人体健康具有重要意义。本文综述了我国农田土壤重金属污染现状,分析了农田土壤重金属污染可能对农作物造成的影响,概括了目前农田土壤重金属污染的主要治理方式,并分析了这些治理方式的差异性和优缺点,对未来农田土壤重金属污染治理的方向作出了展望。为该领域初学者了解该领域研究方向、发展趋势和研究热点提供了指导,也为我国农田土壤重金属污染治理的进一步研究提供参考。  相似文献   

新型规整填料塔间歇精馏优化操作研究     

李飘英  邹德正 《林产化学与工业》1992,12(2):126-133

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Fire-resistant performance of a laminated veneer lumber joint with metal plate connectors protected with graphite phenolic sphere sheeting     

Bambang Subyakto  Toshimitsu Hata  Isamu Ide  Shuichi Kawai 《Journal of Wood Science》2001,47(3):199-207

Creep under fire of laminated veneer lumber (LVL) joined with metal connectors was studied. The fire-resistant performance of LVL butt joints connected with metal plates protected with graphite phenolic sphere (GPS) sheeting was discussed. The GPS sheeting was overlaid on the joint in different sizes and locations. The joint was exposed to a burner with a top flame temperature of 800°C and loaded with a load of 200 N to test for creep under fire. The results showed that the fire-resistant performance of the joint was markedly improved by the sheeting. The size and location of the GPS sheet significantly affected the time to rupture of the specimen, which was six times longer than that without GPS. Temperature measurements at the joint showed that the GPS sheeting distributed the heat along the surface and delayed failure. Thermographic images and analyses clarified the improvement in fire-resistant properties due to GPS.  相似文献   

Use of treated mine water for rainbow trout (Oncorhynchus mykiss) culture: a production scale assessment   总被引：1，自引：0，他引：1  

Roger C. Viadero  Jr.  Aislinn E. Tierney  Kenneth J. Semmens   《Aquacultural Engineering》2004,31(3-4):319-336

In previous proof-of-concept work, it was shown that the use of treated coal mine water for rainbow trout (Oncorhynchus mykiss) culture in a cage was technically feasible, though only a 50-fish bioassay was grown and no work on production-related issues was conducted. To further advance the use of treated mine water, an under-utilized water resource throughout Mid Appalachia, work was conducted to assess the effects of using treated coal mine water for the intensive production of rainbow trout in a flow-through system. During this study, comprehensive water quality data were collected to supplement fish weight and length data taken during routine monthly sampling events. The 8000 fish grew well in the raceway system over the 9 months of production, where a feed conversion ratio of 1.4 and a condition factor of 5.1 × 10⁻⁴ were measured with stocking and harvest densities of 26.4 and 50.2 kg/m³, respectively. Further, total net production was 3275 kg (7220 lb) with 98.6% survival. Throughout the study, dissolved ion concentrations (Fe, Al, Mg, Ca, and SO₄) often exceeded recommended tolerance limits. Further, elevated ammonia nitrogen concentrations generated from a component of the mine water-treatment process were identified as a potential limiting factor for aquaculture development. However, when the non-ideal effects of high ionic strength and the speciation of dissolved metal–ligand complexes were taken into account, the concentrations of free metal ions were within recommended tolerance limits.  相似文献   

拓展校际交流合作 推进世界一流农业大学建设简     

丰蓉  张红生 《中国农业教育》2014,(1):16-19,49

国际化是世界一流农业大学建设的重要抓手之一。通过与国际知名高等教育研究机构及不同国家或地区有代表性的高水平大学签署不同类型的交流与合作协议,有针对性地开展校际间的教授互访、学生联合培养、合作科研和信息资料交换等多个方面的实质性交流与合作,推动学校国际化进程,为世界一流农业大学建设服务。  相似文献