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通过对生命体内物质熵交换的分析,指出意识系统在人类生命过程中的绝对支配地位。结合对人类实践的深入探讨,揭示了维持意识系统基本运转的动力——信息熵的交换,以此提出了意识系统的新陈代谢这一概念,并给出意识系统代谢机制的假想模型——麦氏模型。 相似文献
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微量元素硼对小麦生长发育及碳水化合物代谢的影响 总被引:2,自引:0,他引:2
春小麦赛洛斯用适宜浓度的认浸种和各期根外追肥的方法处理后,皆可促进小麦幼苗根系的生长发育;促进生长锥的分化和器官的形成过程;可提高主茎旗叶面积和花粉生活力;可促进小麦叶部和生殖器官糖类的合成和叶内由光合作用制造出的糖类向生殖器官的运转;春小麦赛洛斯用硼进行根外追肥的时期,从孕穗-开花期喷射效果最显;用硼进行播种前处理和根外喷射,皆能提高小麦产量。 相似文献
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知母皂苷是一系列来源于中药知母的、具有多种药理活性的甾体皂苷类天然产物。通过对近年来国内外关于知母皂苷体体内外研究的文献进行综述,有利于深入探索该类成分体内药效的物质基础和作用机制,为进一步研究知母皂苷的药理作用提供化学物质依据,为新药研发提供一定的理论依据。 相似文献
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甘蔗分蘖期叶面喷施 30 0mg/L硝酸稀土溶液 ,以喷清水作对照 ,应用同位素示踪技术和生化分析进行研究 .结果表明 ,稀土元素处理能促进甘蔗根部及叶片对磷素 (3 2 P)的吸收和向外运转以及在生长旺盛部位的累积 ,能促进甘蔗体内无机磷向有机磷的转化 .伸长盛期喷施 30 0mg/L硝酸稀土 ,甘蔗 1叶全磷量显著增加 ,表明分蘖期后一定时期内喷施稀土仍然具有一定的生理效应 . 相似文献
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利用亚硝酸盐还原酶(Nir)降解发酵食品中产生的亚硝酸盐,是应对亚硝酸盐污染的根本对策。研究乳酸菌亚硝酸盐还原酶的分子调控机制,为进一步揭示乳酸菌nir操纵子调控系统的功能及模式元件的组合、新的调控模型和信号传导的分子调控机制奠定基础,对加快寻找安全有效的亚硝酸盐生物降解法,进而保障国家的食品安全具有重要意义。 相似文献
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速度向量成像技术(VVI)为近年来发展起来的比较热门的新型超声技术,是一种能够定量评价心脏功能的无创性检查,能形象、直观地显示心脏室壁运动在纵向、径向和环向上的运动特征,还能够定量、准确和快速评价心肌运动的协调性。VVI可为早期的心脏功能受损提供可靠依据,在糖尿病性心脏病、尿毒症性心脏病、甲状腺功能亢进症性心脏病这些代谢性心肌病中,根据其应变率与应变的变化,有助于心肌病的早期诊断与疗效观察。因此.本文就速度向量成像在代谢性心脏病中的心功能方面进行研究。 相似文献
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The concept of anaerobic ammonium oxidation (ANAMMOX) is presently of great interest. The functional bacteria belonging to the Planctomycete phylum and their metabolism are investigated by microbiologists. Meanwhile, the ANAMMOX is equally valuable in treatment of ammonium-rich wastewaters. Related processes including partial nitritation-ANAMMOX and completely autotrophic nitrogen removal over nitrite (CANON) have been developed, and lab-scale experiments proved that both processes were quite feasible in engineering with appropriate control. Successful full-scale practice in the Netherlands will accelerate application of the process in future. This review introduces the microbiology and more focuses on application of the ANAMMOX process. 相似文献
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You LIU ;Qun WANG ;Ying-bin PAN ;Zhi-jie GAO ;Yan-fen LIU ;Shao-hong CHEN 《浙江大学学报(自然科学英文版)》2008,(1):44-50
Resistin, a newly discovered peptide hormone mainly secreted by adipose tissues, is present at high levels in serum of obese mice and may be a potential link between obesity and insulin resistance in rodents. However, some studies of rat and mouse models have associated insulin resistance and obesity with decreased resistin expression. In humans, no relationship between resistin level and insulin resistance or adiposity was observed. This suggests that additional studies are necessary to determine the specific role ofresistin in the regulation of energy metabolism and adipogenesis. In the present study, we investigated the effect of resistin in vivo on glucose and lipid metabolism by over-expressing resistin in mice by intramuscular injection of a recombinant eukaryotic expression vector pcDNA3.1-Retn encoding porcine resistin gene. After injection, serum resistin and serum glucose (GLU) levels were significantly increased in the pcDNA3.1-Retn-treated mice; there was an obvious difference in total cholesterol (TC) level between the experiment and the control groups on Day 30. In pcDNA3.1-Retn-treated mice, both free fatty acid (FFA) and high density lipoprotein (HDL) cholesterol levels were markedly lower than those of control, whereas HDL cholesterol and triglyceride (TG) levels did not differ between the two groups. Furthermore, lipase activity was expressly lower on Day 20. Our data suggest that resistin over-expressed in mice might be responsible for insulin resistance and parameters related to glucose and lipid metabolism were changed accordingly. 相似文献
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GM(1,1)模型的改进方法及其应用 总被引:18,自引:0,他引:18
考虑外界环境对灰色系统预测模型精确度的影响 ,对GM(1,1)模型进行了改进———用序列算子和影响因子来对原始序列的数据进行一定的处理 ,提高了GM(1,1)模型的精度。通过对我国普通高等学校招生人数及宁夏的农业总产值进行预测 ,说明此种方法的合理性 相似文献