Adsorption of metal and uranyl ions onto amidoximated Pinus densiflora bark     

Sung Phil Mun  Chang Sub Ku  Jae Phil Kim 《Wood Science and Technology》2010,44(2):283-299

Pine (Pinus densiflora) bark was chemically modified by grafting with acrylonitrile (AN) through Fenton reaction and conversion of the cyano group to an amidoxime group by reaction with hydroxylamine. Treatments of pine bark with 160 mM H₂O₂ at 40°C yielded ~70% grafting in 6-h reaction. After alkali hydrolysis of amidoximated pine bark (AOPB), its adsorption capacity (q _e) for copper ions was largely increased from 0.5 to 1.8 mmol/g. Adsorption of the hydrolyzed AOPB (HAOPB) followed the pseudo-second-order kinetic model. Among the metal ions tested, the order of adsorption capacity (q _e) predicted by the kinetic model at equilibrium time was Hg²⁺ > UO₂ ²⁺ > Cd²⁺ > Cu²⁺ > Zn²⁺ > Ni²⁺. The adsorption process was pH-dependent, and the adsorption equilibrium was observed in the pH range of 6–7 for all the metal ions. Even though pine bark is a good adsorbent for Hg²⁺ and UO₂ ²⁺ ions, it had a poor affinity for the other ions tested. It was obviously found that HAOPB had very high adsorption abilities for heavy metal and uranyl ions.  相似文献   

作物株型相关性状分子机理的研究进展   总被引：5，自引：0，他引：5  

库丽霞  张君  张伟强  吴连成  张少方  王平安  陈彦惠 《中国农学通报》2010,26(5):20-25

作物株型是通过对光合产物的形成和籽粒填充物的储藏的影响进而决定产量的综合农艺性状,而株高、分蘖数、分蘖夹角和叶夹角是其主要影响因素。对关于控制这些性状的分子机理进行了综述,分析了利用这些基因通过基因工程改良株型进一步提高单位面积产量的可行性。  相似文献   

N-氨甲酰甘氨酸亚铁的合成及表征     

李嘉伟  舒绪刚  张敏  吴信  樊明智  赖荣良  谢倩雯 《仲恺农业技术学院学报》2013,(4):16-19

以N-氨甲酰甘氨酸和七水合硫酸亚铁为原料合成了N-氨甲酰甘氨酸亚铁,并通过正交实验优化得到了最佳合成工艺条件.结果表明,当n(C3H6N2O3)∶n(FeSO4·7H2O)=2∶1时,以水为溶剂,维生素C(VC)为抗氧化剂,NaOH为pH调节剂,弱酸条件下60℃反应10 min,产品收率达到78.1%.  相似文献   

苦菜和蒲公英中总黄酮含量及其抗氧化活性分析     

张坤  李亦楠  苏艳  于军香  郗冬梅  井文倩 《黑龙江农业科学》2013,(11):99-101

为加强苦菜和蒲公英的进一步开发利用,研究了乙醇浓度、料液比和提取时间对苦菜和蒲公英总黄酮得率以及不同浓度提取物对苦菜和蒲公英抗氧化活性的影响。结果表明：苦菜和蒲公英总黄酮提取的最优化条件为提取液乙醇的浓度为60％,料液比为1：30,超声提取时间为0．5h,总黄酮得率分别为6．44％和17．56％。苦菜和蒲公英提取物对DPPH自由基清除率随样品提取物浓度的增大而升高,在浓度为9．6rag·mL^-1时,苦菜和蒲公英提取物的DPPH自由基清除率都达到最大,分别为76．47％和80．39％。  相似文献   

有机锰锌的络合强度与其在肉鸡体内吸收利用的关系及机制     

罗绪刚 《中国家禽》2011,33(9)

1 有机微量元素的概念和分类 1.1 有机微量元素的概念 有机微量元素是指微量元素的无机盐与有机配位体形成产物的总称,如赖氨酸铜、白锰等.有机微量蛋元素产品被研发企业称为所谓的"第三代"微量元素添加剂.有机微量元素营养是动物营养工作者目前研究的热点之一.  相似文献   

Relative bioavailability of selenium yeast for broilers fed a conventional corn–soybean meal diet     

Guoqing Liu  Yuzhen Zhao  Sumei Cao  Xugang Luo  Runlian Wang  Liyang Zhang  Lin Lu  Xiudong Liao 《Journal of animal physiology and animal nutrition》2020,104(4):1052-1066

The present study was conducted to assess the relative bioavailability of selenium (Se) as Se yeast (SY) relative to sodium selenite (SS) for broilers fed a conventional corn–soybean meal diet. A total of 360 one-d-old Arbor Acres commercial broilers were randomly assigned to 5 treatments with 6 replicates per treatment in a completely randomized design involving a 2 (Se sources: SY and SS) × 2 (added Se levels: 0.20 and 0.40 mg Se/kg) factorial design of treatments plus 1 (a Se-unsupplemented control diet) for 42 days. The results showed that Se concentrations in plasma, liver, heart, breast muscle, pancreas and kidney of broilers on d 21 and 42, glutathione peroxidase (GSH-Px) activity in the pancreas on d 21 as well as in the breast muscle and pancreas on d 42, and GSH-Px mRNA levels in the liver, heart, breast muscle and pancreas on d 21 increased linearly (p < .03) as levels of added Se increased. Furthermore, a difference (p ≤ .05) between SY and SS was detected for Se concentrations in plasma, liver, heart, breast muscle, pancreas and kidney, GSH-Px activity in pancreas on both d 21 and 42, as well as pancreatic GSH-Px mRNA level on d 21. Based on slope ratios from the multiple linear regressions of the above indices, the Se bioavailabilities of SY relative to SS (100%) were 111%–394% (p ≤ .05) when calculated from the Se concentrations in plasma, liver, heart, breast muscle, pancreas, kidney and GSH-Px activities in pancreas on d 21 and 42, as well as GSH-Px mRNA level in pancreas on d 21. The results from this study indicated that the Se from SY was more available for enhancing the Se concentrations in plasma or tissues and the expression and activity of GSH-Px in pancreas of broilers than the Se from SS.  相似文献   

石灰性水稻土中硝酸盐依赖型与光合型亚铁氧化过程          下载免费PDF全文

陈志怀  王旭刚  孙丽蓉  董乐恒  郭大勇  石兆勇 《土壤学报》2023,60(1):127-137

厌氧条件下土壤中铁氧化还原过程与土壤氮循环关系密切,且硝酸盐依赖型亚铁氧化(nitrate-dependent ferrous oxidation,NDFO)和光合型亚铁氧化(photosynthetic ferrous oxidation,PFO)是亚铁氧化的两个重要的生物途径,然而目前关于石灰性水稻土中NDFO与PFO之间的关系仍不明晰。以采自黄河中下游地区河南省孟津县的水稻土为样品,设置培养前添加和培养过程中添加10 mmol·L^-1的硝酸根离子/铵离子(NO₃^-/NH₄⁺)的恒温厌氧泥浆培养试验,通过监测泥浆中Fe(Ⅱ)、O₂、NO₃^-和亚硝酸根离子(NO₂^-)的动态变化与培养后的NH₄⁺含量探究了NO₃^-在石灰性水稻土Fe(Ⅱ)氧化过程的作用及其与光合型亚铁氧化的关系。结果...  相似文献   

Fertigation rate,leaching fraction,and growth of potted poinsettia     

Catherine S. M. Ku  David R. Hershey 《Journal of plant nutrition》2013,36(12):1639-1652

Single‐pinched poinsettia (Euphorbia pulcherrima ’V‐14 Glory') in 15‐cm pots received constant fertigation with 50, 100, 200, and 300 mg.L^‐1 nitrogen (N) from a 20N‐4.4 phosphorus (P)‐16.6 potassium (K) fertilizer with a leaching fraction (LF) of 0, 0.2, or 0.4. Plants received 25 irrigations during the 13‐week study. The shoot fresh and dry masses with 50, 100, and 300 mg.L^‐1 N at the 0.4 LF were 30% larger than at the 0 LF. The 300 mg.L^‐1 N fertigated plants had approximately 15% more leaf area and almost 122% more bract area than the 50 mg.L^‐1 N fertigated plants. The leaf N concentration of plants fertigated with 100, 200, and 300 mg.L^‐1 N was near or in the normal range of 4 to 6%, but was below the critical level of 3.5% with 50 mg.L^‐1 N fertigation. In contrast, the leaf P concentration approached or exceeded the toxic level of 0.9% with 100 to 300 mg.L^‐1 N. The N fertigation of 100 to 200 mg.L^‐1 is adequate for producing a quality poinsettia crop. Quality poinsettias can be grown at a 0 LF if quality irrigation water is available. With 11 mg.L^‐1 P via fertigation, the leaf P concentration was in the acceptable range. The P concentration in the 20N‐4.4P‐16.6K complete fertilizer was excessive for poinsettia and would contribute to unnecessary P leaching.  相似文献   

基于地理权重回归模型的土壤有机质空间预测   总被引：3，自引：0，他引：3  

王库 《土壤通报》2013,(1):21-28

准确了解土壤有机质的空间分布是合理施肥的重要前提,也是水土流失控制及保护环境的重要基础。利用113个土壤有机质样点数据,以海拔高度、土壤侵蚀强度、土地利用、比值植被指数、样点至河流的欧氏距离、亚铁矿物指数及坡度为参考因子,来尝试利用GWR(Geographically Weighted Regression)模型探索多重因素作用下的土壤有机质空间分布,并通过与普通线性回归(ordinary least squares,OLS)相比较,来了解GWR模型的精度,进而进行了土壤有机质的空间制图,并对其制图效果进行了评价。结果表明,与OLS模型相比,GWR预测模型它能显著降低AIC(Akaike Information Criterion)值,较大程度地提高模型的决定系数,并有效地减少模型的回归残差值。从制图的总体效果看,GWR模型的预测结果与实测值的吻合程度要优于OLS模型。文章还对利用GWR模型进行回归时的样点数量、因子筛选及因子定量化等方面进行了相应的讨论。  相似文献   

Poultry Residual Composts: Materials Balance and Crop Response     

L. E. Carr  H. L. Brodie  J. C. Bouwkamp  C. S. M. Ku 《Compost science & utilization》2013,21(2):36-43

This paper discusses compost production yields as a percent of raw product mix using poultry litter, poultry processing plant dissolved air flotation skimmings, sawdust, wood chips and ground yard debris. Three different mixes were used and identified as Mixes 1, 2 and 3. Mixes 1 and 2 were produced using windrows and a windrow turner and Mix 3 was made using a covered in-channel compost turner. Mixes 1 and 2 were poultry litter compost with a screened mass yield of 80 and 77 percent, respectively. Mix 3 was a dissolved air flotation compost with a screened mass yield of 40 percent. Results from plant experiments show poultry litter compost can be used successfully in potting mixes for poinsettia and chrysanthemum production. A compost produced from dissolved air flotation skimmings, a poultry processing waste, can be used in field corn production but had little influence in the production of soybeans.  相似文献