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   

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   

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   

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   

Synthesis,characterization and aggregation and fluorescence properties of novel highly soluble zinc phthalocyanines bearing tetrakis-4-(3-(piperidin-1-yl)phenoxy) with tetra and dodecachloro substituents     

Palanisamy Muthukumar  Hak-Soo Kim  Kyo-Sun Ku  Jong Ho Park  Young-A. Son 《Fibers and Polymers》2016,17(4):553-559

The synthesis of two new phthalocyanine precursors 4-(3-(piperidin-1-yl)phenoxy) with mono (2) and trichloro (3) substituents were carried out in this work. Cyclotetramerization of these precursors with zinc acetate gave novel tetrakis-4-(3-(piperidin-1-yl)phenoxy) with tetra (4) and dodecachloro (5) substituted zinc phthalocyanines. The synthesized new compounds were characterized using FT-IR, ¹H NMR, electronic absorption spectroscopy, mass spectra and elemental analysis. The aggregation behavior of zinc phthalocyanines 4 and 5 was investigated in different concentrations of dichloromethane (DCM). Zinc phthalocyanines 4 and 5 showed good solubility in different organic solvents such as DCM, CHCl₃, THF, benzene and toluene. Further, the aggregation behavior of zinc phthalocyanines 4 and 5 was studied before and after the addition of Triton X100. Further, the fluorescence quantum yields of zinc phthalocyanines 4 and 5 were calculated in the presence and absence of Triton X100.  相似文献   

Antioxidant properties of monomeric,oligomeric, and polymeric fractions in hot water extract from <Emphasis Type="Italic">Pinus radiata</Emphasis> bark     

Chang Sub Ku  Sung Phil Mun 《Wood Science and Technology》2008,42(1):47-60

Hot water extract (HWE) from Pinus radiata bark was fractionated into monomeric polyphenol (MPP), oligomeric proanthocyanidin (OPA), and polymeric proanthocyanidin (PPA) fractions by monitoring the UV-visible spectrum of the eluted fractions. Nine polyphenols were identified in MPP: three phenolic acids and six flavonoids. The major compounds of MPP were taxifolin (456 μg/mg), catechins (240 μg/mg), and protocatechuic acid (46.2 μg/mg). The OPA components ranged from dimers to hexamers. PPA comprised procyanidin (PC, 94%), a small amount of prodelphinidin (PD, 6%), and also the higher trans configuration, rather than the cis configuration, of C2-C3. The average molecular weight (Mw, Mn), polydispersity (Mw/Mn), and DP of PPA were 3,800 (Mw), 1,200 (Mn), 3.2 and 13, respectively. The potential antioxidant activities of HWE and the three fractions were estimated using proton- or electron-donating assays containing 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical, 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) radical cation, superoxide anion (O₂^•−), hydrogen peroxide (H₂O₂), reducing power and lipid peroxidation. All the bark fractions exhibited potent quenching abilities against both commercially available radicals (DPPH•, ABTS^•+) and chemically induced radicals (H₂O₂, O₂^•−), as well as strong reducing power and inhibitory activity of lipid peroxidation. Particularly, OPA showed a hydrogen peroxide scavenging activity significantly higher (p < 0.05) than that of the other fractions. From 2-thiobarbituric acid reactive substances and ferric thiocyanate assays, PPA was suspected to act by essentially delaying the formation of hydroperoxide by quenching free oxygen radicals that operates in oil-in-water emulsion.  相似文献   

Development and future direction of induced systemic resistance in plants   总被引：7，自引：0，他引：7  

Joseph Ku 《Crop Protection》2000,19(8-10):859-861

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花生品种在巴州地区复播的综合评价     

陈晋瑞  杜珊珊  张磊磊  库尔班·牙生 《中国农学通报》2020,36(34):15-19

为筛选适宜在新疆巴音郭楞蒙古自治州复播种植的花生品种,在巴州地区复播种植6个花生品种,采用灰色关联度分析方法对10个农艺性状进行综合评价,并分析产量与各农艺性状的相关性。结果表明,综合评价中,各花生品种的等权关联度与加权关联度排列位次一致,排列位次为‘吉花4号’>‘四粒红’>‘DF05’>‘远杂9102’>‘DF06’>‘闽花6号’。‘吉花4号’综合性状评价优于对照‘四粒红’,适宜在新疆巴州地区复播条件下推广种植。而花生‘DF05’、‘远杂9102’、‘DF06’、‘闽花6号’的综合农艺性状劣于对照‘四粒红’,不建议推广种植。相关分析表明,产量与出仁率呈显著正相关。研究结果为巴州地区引进花生高产品种提供了材料基础和理论依据。  相似文献   

Importance of Staphylococcus hyicus ssp hyicus as a cause of arthritis in pigs up to 12 weeks of age     

BD HILL  BG CORNEY  TM WAGNER 《Australian veterinary journal》1996,73(5):179-181

Lame pigs, up to 12 weeks of age, were necropsied to establish a diagnosis. Of 175 pigs examined, 165 were confirmed to have arthritis by histopathological examination of joint tissues. Lesions were most common in the elbow and tarsal joints and least common in the joints of the feet. Typically, there was severe fibrinopurulent inflammation of synovial membranes regardless of the bacteria isolated. A bacterial aetiology was found in 114 (69%) of the 165 pigs. In arthritic pigs in which an aetiology was established the causative agents were Staphylococcus hyicus ssp hyicus (24.6%), Streptococcus equisimilis (26.3%), Actinomyces pyogenes (13.2%), Staphylococcus aureus (7.9%) and Haemophilus parasuis (7.9%). While gender did not affect the prevalence of arthritis, there was an age influence, most of the pigs culled for arthritis being under 6 weeks of age.  相似文献