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NBL1010型电子加速器的辐照应用 总被引:3,自引:1,他引:2
本文系统介绍NBL 1 0 1 0型电子加速器在半导体器件改性、宝石着色、环保三废处理、辐射化学合成、农业废弃物辐射降解、一次性医疗用品消毒、食品保鲜、药用植物辐照灭菌、水晶着色、辐照商品养护等应用效果 ,并与60 Co辐照加工进行比较 相似文献
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中国粮食作物辐射诱变育种及其影响因素分析 总被引:11,自引:3,他引:11
本文通过辐射诱变育种成果生产函数模型的建立 ,分析了影响新品种产生的各种因素及其作用 ,得出了科研投资、人力资本和辐照设施是决定辐射诱变方法所育成新品种产量水平及推广面积的最重要因素。并得出了并非所有的从事辐射诱变育种的单位必须有辐照设施 ,国家仅需加强具有较强研究能力的从事辐射诱变育种研究单位的辐照设施投资 ,而将节省的经费用于诱变育种研究项目的投入 ,使更多的单位能够进行辐射诱变育种研究工作 ,增加选育出具有更优良变异材料的机会 相似文献
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~(60)Co辐照对白灵菇采后低温贮藏的影响 总被引:3,自引:0,他引:3
以0.8、1.2、1.6和2.0kGy60Coγ射线辐照白灵菇,在4℃下贮藏保鲜。结果表明,经过1.2kGy辐照处理的白灵菇维持了最高的可溶性蛋白质含量和最大的硬度,贮藏保鲜时间最长。白灵菇在贮藏期间的硬度越大,其可溶性蛋白的含量也越高,且二者之间存在显著的相关性。辐照会加大白灵菇的细胞膜透性,破坏细胞膜结构,剂量过大反而会加速营养成分降解和腐烂。 相似文献
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STUDIES IN PEDOGENESIS IN NEW SOUTH WALES 总被引:1,自引:0,他引:1
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Strawberries (Fragaria × ananassa Duch. cv. Nyoho) grown in peat-based substrate often suffer interveinal chlorosis in their immature leaves 10–20 d after planting. Based on our previous results and observations from growing practice, we hypothesized that the cause of this phenomenon could be due to drastic changes in plant nitrogen (N) nutrition in strawberries just after planting into peat bags. To determine optimal sampling time, diurnal variations in foliar ammonium (NH4)-N concentration were evaluated under greenhouse conditions. Results showed a broadly similar pattern of diurnal variation, with the rates increasing to a maximum at midday and decreasing steadily during the second-half of the light period. However, foliar NH4-N concentration was higher under sunny than under cloudy or shaded light conditions. In the second part of this study, changes in foliar NH4-N and in nitrate (NO3)-N in petioles in relation to the occurrence of interveinal chlorosis were investigated. When the plants were supplied with 30 (control) or 50% ‘Ohtsuka A’ nutrient solution for two weeks after planting, foliar NH4-N concentrations increased earlier than petiole NO3-N concentrations, and reached their peak 8 and 10 days after planting in 50% (1.90 μmol g?1 FW) and 30% (1.78 μmol g?1 FW) treatment respectively. Interveinal chlorosis was observed in immature leaves in 50% treatment about 10 days after planting while there was no chlorotic symptom in control treatment. The absence of interveinal chlorosis in immature leaves in control plants, led to the conclusion that a high leaf NH4-N concentration and related accumulation of NH4-N play an important role in triggering interveinal chlorosis. 相似文献
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Several methods for determination of extractable iron (Fe; or so-called “active Fe”) have been proposed. In this study, three methods of Fe extraction were tested: 1.5% phenanthroline (pH 3) and 1 M hydrochloric acid (HCl) from fresh leaves, and 1 M HCl from oven-dry leaves. A six-year-old avocado orchard (cultivar ‘Hass’), grown on a calcareous soil in the proximity of Cabildo (Valparaíso region, Chile), was selected for the study. Samples of mature (5–7 moths-old) leaves of different degree of chlorosis were collected. Total Fe concentrations in chlorotic leaves were similar or even greater than in green leaves. Regressions between the extractable Fe concentrations and the leaf SPAD-color were statistically significant for phenanthroline method, while non-significant for HCl methods. Thus, phenanthroline method was superior over others for diagnosis of Fe deficiency in avocado. Phenanthroline-extractable Fe concentration of 6 mg kg?1 was considered as a critical value for mature avocado leaves. 相似文献