运动性疲劳的细胞机制及研究进展   总被引：18，自引：0，他引：18  

侯春丽  闫守扶  孙红梅 《首都体育学院学报》2003,15(1):89-92

运动性疲劳是一个十分复杂的过程，并受到多种因素的影响，迄今为止人们对其产生的机理仍未达成一致的看法。本文就运动性疲劳的机制问题对近几年来研究的热点及最新进展情况试作阐述。  相似文献   

吸高氧对赛艇运动员大强度运动后血乳酸、酸碱度的影响   总被引：4，自引：0，他引：4  

胡永欣  肖国强 《体育学刊》2002,9(6):131-133

观察赛艇运动员运动后吸入高氧对乳酸(La)、碳酸氢根离子(HCO3^-)和pH值的影响，实验使用测功仪，在15min内划完4000m的运动负荷，测试吸氧量(VO2)、心率(HR)、血La、血pH值和HCO3^-浓度。结果表明，吸氧组与不吸氧组相比，吸氧组血La、pH值恢复得较快，并在运动后5、10min有显性差异；同样吸氧组HCO3^-恢复得较快，且在运动后20、30min有显性差异。结果提示，运动后吸氧可能改善体内酸性环境，加快乳酸的消除，有助于机体的恢复。  相似文献   

Consolidation of Black-dyed Māori Textile Artefacts: Evaluating the Efficacy of Sodium Alginate     

Catherine A. Smith  Rachel A. Paterson  Bronwyn J. Lowe  Rangi Te Kanawa 《文物保护研究》2018,63(3):139-154

Black-dyed artefacts are found in museums worldwide, many produced using an iron-tannate compound. Deterioration of iron-tannate dyed artefacts is an international preservation issue: in New Zealand the deterioration of paru (iron-tannate) dyed Māori textiles is widespread. This article reports experimental work testing the efficacy of sodium alginate, a consolidant developed for deteriorated paru-dyed muka (fibre from harakeke; Phormium tenax). The colour stability, strength retention, and acidity of paru-dyed muka consolidated with sodium alginate (0.25, 0.5, and 1% w/v in water) was tested pre- and post-artificial light ageing. This study found that sodium alginate had no negative effect on paru-dyed muka and in some cases provided benefit. Interestingly, the colour of paru-dyed muka is substantially more stable in UV-filtered light than previously recognised. Also microfading results were in agreement with visual assessments of colour change at 1 Mlux hour exposure, providing confidence in this relatively new technique to assess colour change.  相似文献   

The effect of modifiers on the stability of a vinyl acetate/ethylene copolymer dispersion     

Jane L. Down 《文物保护研究》2016,61(1):26-45

This paper examines the effect of modifiers on the stability of a vinyl acetate/ethylene copolymer dispersion adhesive upon aging. Eighteen common modifiers were added to a well-characterized vinyl acetate/ethylene copolymer dispersion (Dur-O-Set^® E-150) in known concentrations and dry-film samples were subjected to 16–17 years of dark aging and seven to eight years of light aging. Yellowing, pH, gloss, swelling, cohesive strength, and flexibility were monitored for changes upon aging. Generally, the neat Dur-O-Set^® E-150 (no additives) was found to become acidic on aging, but was fairly resistant to yellowing. It also swelled substantially in toluene, was of high gloss, medium strength, and flexible, and remained so on aging. No modifier was found to improve these properties. Various solvents, wetting agents, and thickeners did not alter the properties by much, while plasticizers, freeze-thaw stabilizer, glycerin, and certain fillers had a more negative effect.  相似文献   

木聚糖酶的稳定性研究     

黄建新  朱凤荣 《平原大学学报》2004,21(3):12-13

本文研究了木聚糖酶的稳定性及最适温度和最适pH值。结果发现，木聚糖酶具有较差的热稳定性和较好的pH值稳定性。其最适温度为50℃，最适pH值为4．2。  相似文献   

温度和pH对侧耳属两菌株菌丝生长的影响     

吴政声  翁祖英 《泉州师范学院学报》2005,23(2):86-90

观察在不同温度和pH值条件下，鲍鱼菇8120（Pleurotus abalone 8120）和平菇P54（Pleurotus ostreatus P54）菌丝体的生长情况．结果表明：鲍鱼菇8120菌丝适宜生长温度为20℃～33℃，最适温度为22～28℃。适宜pH值为5．0～8．0，最适pH值为7．2～8．0；平菇P54菌丝适宜生长温度为20℃～33℃，最适温度为25℃～31℃，适宜pH值为5．0～8．0，最适PH值为6．0～6．5．  相似文献   

"酸汤"发酵过程中酸度的动态变化     

石敏  袁玮 《凯里学院学报》2007,25(3):30-31

通过对民族传统食品"酸汤"发酵过程中酸度的测定,得出"酸汤"在发酵中酸度的变化曲线,为实际生产及食用提供理论参考依据.  相似文献   

齐鲁师范学院新校区水质的分析     

刘国鹏  陈荣华  袁东  许青 《山东教育学院学报》2011,26(5):151-155

以齐鲁师范学院章丘新校区生活饮用水（自来水、凉开水）和中水为研究对象,以去离子水为对比样品,分别采用分光光度法、玻璃电极法和EDTA滴定法测定了水样的浊度、pH值和总硬度。实验结果表明,新校区的自来水在这三个方面均符合国家规定的饮用水水质标准,中水符合国家规定的建筑中水水质标准。中水的浊度明显高于自来水。自来水和中水的pH值没有明显差别。加热煮沸后,自来水的总硬度明显降低,pH值略有升高。  相似文献   

湿法脱硫中pH传感器的信号处理研究     

岳香梅  李子萌 《雁北师范学院学报》2011,27(1)

在脱硫工艺中,浆液pH值的控制,关系到脱硫效率的高低。传统的pH值控制系统,具有pH信号反馈响应慢,控制调节浆液的pH值滞后于系统的工艺要求。通过对该问题的研究分析,提出了pH信号反馈采用前反馈控制设计,并据此初步设计了基于微处理芯片的pH信号处理的电路原理图,提高了pH信号反馈的响应速度,从而满足了电厂脱硫的工艺要求。  相似文献   

精处理高速混床出水pH降低的原因分析     

翁梓怀 《科技风》2014,(19):88-88

广东惠州平海发电厂在高速混床投运时出现产水pH降低现象,本文通过试验和分析,认为引起这一现象的原因是混床树脂混和不均,和树脂交叉污染,在碱性水工况下运行时释放出氯离子,导致高速混床产水pH降低。  相似文献