共查询到20条相似文献，搜索用时 93 毫秒
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枳砧纽荷尔脐橙(Citrus sinensis Osbeck.)盆栽苗,在碱性紫色石骨子土中单独或混合加入砷、铅、汞,以研究砷、铅、汞在植株器官组织中的分布与累积。在3 a的盆栽试验期间,土壤中的砷、铅、汞质量分数分别维持在添加质量分数的30%～86%、46%～64%和84%～118%。结果表明,不同重金属在植株不同器官部位质量分数不一样,砷和汞在植株器官组织中的质量分数表现相同特征,根系>叶片>枝干>果皮>果肉,而铅为:根系>枝干>叶片>果皮>果肉。高质量分数处理的根系中砷、铅和汞质量分数最高分别达到7.2、773.6、0.50 mg.kg-1,而砷、铅和汞在果皮中最高质量分数仅分别为0.15、0.06、0.006 mg.kg-1,果肉中最高质量分数分别为0.06、0.05、0.004 mg.kg-1,砷、铅、汞在果实中的最高质量分数远低于国家绿色食品限值标准。未发现土壤砷+铅+汞混合处理对其在植株器官组织内的累积有任何拮抗或协同效应。 相似文献
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四种鲜牛肝菌成分分析 总被引：1，自引：0，他引：1
采用原子吸收分光光度法、比色法等方法对美味牛肝菌、华美牛肝菌、美柄牛肝菌和绒柄牛肝菌4种鲜牛肝菌的粗蛋白、粗脂肪、矿质元素、有害元素的含量进行测定.结果表明,4种鲜牛肝菌中,粗蛋白、粗脂肪、总糖和粗纤维的含量范围分别是4.38%～5.42%、2.47%～3.07%、1.26%～3.85%、1.23%～1.56%;矿质元素铁、锌、钙的含量范围分别是19.62～37.96mg/kg、6.53～9.67mg/kg、146.23～298.02mg/kg;总砷含量未检出,有害元素总汞、铅、镉的含量范围分别是0.06～0.73mg/kg、0.4～0.62mg/kg、0.075～0.105mg/kg.结论：这4种野生鲜牛肝菌含有丰富的营养成分,但华美牛肝菌、美柄牛肝菌中总汞含量较高,值得关注. 相似文献
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宜宾芽菜是宜宾地方特有的传统产业,从清乾隆年间开始种植生产、加工,迄今已有280年历史,深受美食家和全国人民喜爱.绿色栽培宜宾芽菜专用青菜(叶用芥菜),为宜宾芽菜加工企业提供了稳定的、优质的专用原料,是擦亮四川省宜宾市翠屏区"中国芽菜之乡"金字招牌,把"宜宾芽菜"打造成为继"五粮液""宜宾早茶"后的又一张靓丽名片的坚实基础. 相似文献
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AIM：To establish a fast, accurate and economical technique for culturing mouse pulmonary arteriolar smooth muscle cells (PASMCs), and to explore the effects of hypoxia on the proliferation and apoptosis of the PASMCs. METHODS：In sterile condition, the pulmonary artery was isolated from the male BALB/c mice by digesting with collagenase I, and the cells were cultured in fetal bovine serum-coated flask. Centrifugal procedure was not used during the cell passage. The cell morphology was observed under an inverted phase-contrast microscope. α-Smooth muscle actin was identified by immunocytochemistry and immunofluorescence. The effects of hypoxia on the proliferation and apoptosis of the PASMCs were detected by CCK-8 assay and TUNEL assay. RESULTS：PASMCs were identified by the methods of immunocytochemistry, immunofluorescence staining and observation of morphology. Unlike the rat PASMCs with typical subcultured peak-vally pattern, the mouse PASMCs showed a lot different without a peak-vally pattern. The cells could be subcultured after 5 d to 7 d and there was 3 to 5 generations depending on the activity of the cells. CCK-8 assay demonstrated that the A values of PASMCs exposed to hypoxia increased after 24 h (P＜0.05) as compared with normoxia. TUNEL result showed that the apoptotic index of the PASMCs in hypoxia decreased after 24 h (P<0.05). CONCLUSION：This technique for obtaining cultured mouse PASMCs is simple, fast, accurate and economical. The digestion time is easy to control. Hypoxia promotes the proliferation and inhibits the apoptosis of PASMCs. 相似文献
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小檗碱和壳聚糖抗蔬菜病原真菌活性测定及复合膜制备 总被引：2，自引：0，他引：2
研究了小檗碱和壳聚糖对几种常见蔬菜病原真菌的抑制活性,以及以小檗碱和壳聚糖为主料制备复合膜的方法,并测定了该膜的药物释放效果。试验表明:低浓度(0.234 mg/mL)小檗碱即可抑制辣椒炭疽病菌(Vermicularia capsici)等5种蔬菜病原真菌的生长。20 mg/mL浓度壳聚糖对番茄灰霉病菌(Botrytis cinerea)的抑制率高达65%,而对其余4种果蔬病原真菌也有一定的抑制作用。为了集成这2种天然化合物的优点,制备了小檗碱-壳聚糖复合膜,该膜具有缓释功能,在模拟外部环境(磷酸缓冲液,pH 6.8)条件下,20 d小檗碱累计释放率接近25%,提示其在果蔬贮藏抗菌中的应用价值。 相似文献
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钾肥在小白菜和萝卜上的施用效果 总被引：6，自引：0，他引：6
采用盆栽试验方法研究了施用钾肥对小白菜、萝卜生长发育、产量、品质及钾素含量的影响。结果表明 ,施用钾肥对小白菜和水萝卜的株高、叶片数无显著的影响 ,但可提高水萝卜块根的产量 ,提高幅度为 31.0 4 %～ 97.93%。施用钾肥可提高小白菜和萝卜的蛋白质和VC含量 ,降低硝酸盐含量 ,增加植株的钾素含量 相似文献
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Fresh onion seeds desiccated to 6.0% seed moisture content (SMC) were stored in various packaging materials under different storage conditions. Seeds packed in aluminum-laminated pouches beside those stored with silica gel at 25 °C maintained satisfactory germinability and vigour after 12 months. Desiccated seeds stored in moisture impervious containers produced more vigourous seedlings. Germination potential of onion seeds increased with reduced SMC besides storage in moisture impervious packets along with desiccants as physiological and biochemical attributes are regulated. Seed viability and vigour decreased with accelerated ageing due to increased lipid peroxidation, decreased activities of several free radical and peroxide scavenging enzymes. Electrical conductance of seed leachates also increased with ageing. Thus, adoption of appropriate storage temperature and moisture control techniques would significantly affect onion seed quality, which was due to minimum accumulation of free peroxide radicals and enhanced activity of free radical scavenging enzymes. 相似文献
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大棚葡萄种植过程中,容易产生多种病虫害,如黑痘病、炭疽病等。针对当前山西省大棚葡萄的种植情况,本文分析了大棚葡萄常见的病虫害,重点阐述了病虫害防治技术,如物理防治、化学防治、农业防治、生物防治等,为大棚葡萄病虫害的科学防治提供参考。 相似文献
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云南红河州泸西县为云南重要的苹果新产区,调查鉴定泸西县苹果病虫害的发生情况,对泸西县的苹果病虫害防控,苹果产业发展具有重要意义。本研究系统调查和鉴定了云南红河州泸西县向阳乡习峨村、三塘乡、向阳乡沙马村等3个苹果产区的病虫害。通过室内病原显微观察,对真菌病原进行形态鉴定,应用RT-PCR检测技术与测序鉴定病毒,害虫形态鉴定。最终结果表明:云南泸西苹果病虫害共8种,其中真菌病害3种,有斑点落叶病、枝干轮纹病、褐斑病;病毒病害2种,有苹果茎沟病毒病、苹果花叶病毒病;虫害3种,蚜虫、蓟马和金纹细蛾3种虫害。其中斑点落叶病和褐斑病为主要病害,病毒病害其次,虫害发生率较小。其次通过调查与鉴定,否定了危险性病害苹果炭疽叶枯病在云南泸西的存在。 相似文献
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