排序方式: 共有62条查询结果,搜索用时 609 毫秒
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以Gunnera/Nostoc共生体为材料,研究、比较了碳水化合物和H2对其固氮活力呼吸速率的影响,结果表明,在正常条件下,外源H2可提高Gunnera/Nostoc共体固氮活力近100%,却使其呼吸速率下降低50%;而碳水化合物(葡萄糖)也可使其固氮活力提高约100%,并使其呼吸速率提高近160%。表明碳水化合物H2均可为Gunnera/Nostoc共生体提高固氮过程的还原力。由于H2的循环利用 相似文献
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大棚栽培多数是长年连作,密闭条件好,土壤中农药的残留问题就更加明显。实验证明藻类植物地木耳可在大棚中生存。通过在大棚种植的蔬菜旁种植地木耳,可使大棚土壤和蔬菜中农药含量降低.降低幅度约为59%。 相似文献
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地木耳(Nostoc commune)是一种固氮蓝藻,其固氮活性是可逆的,在天然草地氮素循环中起着重要的作用。试验模拟了年际间降水量变化和放牧强度对地木耳生长的影响,以期为合理利用和管理天然草地提供依据。结果表明,适度放牧促进了地木耳的生长,其早期和后期生长速度分别是不放牧时的3倍和4倍,不放牧时生长最慢。降水量对地木耳后期生长速度与早期生长速度的影响呈相反的趋势,高降水量显著提高了早期生长速度,是最低降水量时的14倍;平均降水量显著提高了后期生长速度。适度放牧、高降水量时早期生长速度最快,适度放牧、平均降水量时后期生长速度最快。 相似文献
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Kohji Hori Tomoko Ueno-Mohri Takuo Okita Genji Ishibashi 《Plant foods for human nutrition (Dordrecht, Netherlands)》1990,40(3):223-229
Blue-green alga,Nostoc commune, contained moderate amounts of protein and iron. Itsin vitro protein digestibility was 43–50%. The soluble and ionic iron from the alga was extractable to some extent at pH 1.5 but was not detectable at pH 8.0. The digestion by protease did not affect the iron detection. Heat processing at 100 and 120°C failed to increase the digestibility and the content of available iron. The dietary fiber in the alga may be responsible for low protein digestion and low iron availability. 相似文献
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李莉 《(《农业科学与技术》)编辑部》2009,(1)
[Objective]The experiment aimed to explore a new way for observing surface structure of Nostoc sphaeroides Kutzing. [Method] The scanning electron microscope was used to observe the epidermal ultrastructure of wild and cultured Nostoc sphaeroides Kutzing. [Result] The epidermis of wild and cultured Nostoc sphaeroides Kutzing showed mixture structure of fibril colloid which was reticular arranged. The difference between wild and cultured Nostoc sphaeroides Kutzing was that the outer epidermis of cultured Nostoc sphaeroides Kutzing had trichome distribution but the wild Nostoc sphaeroides Kutzing did not has such distribution. The obsevation results of under smaller than 10 μm by scanning electron microscope was touched thick and showed many folds and distortions.[Conclusion] The scanning electron microscope was an effective way to study development of Nostoc sphaeroides Kutzing colony and it was worth popularizing. 相似文献
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