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   

芨芨草水土保持功能的初步研究   总被引：9，自引：0，他引：9  

王库 《水土保持研究》2001,8(2):157-159

芨芨草是黄土高原地区广泛分布的禾本科植物.人们对其水土保持方面的定量研究基本上还处于空白.通过对芨芨草草地土壤抗冲性、渗透性、土壤抗剪强度等指标的研究,来探讨芨芨草的水土保持功能.结果表明:芨芨草能明显提高土壤的抗冲性、渗透性及土壤的抗剪强度,并能增加地表的覆盖度.芨芨草在黄土高原地区的水土保持工作中有着广阔的应用前景.  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

  相似文献   

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   

Design of Neural Network Predictor for the Physical Properties of Almond Nuts     

İkbal Eski  Bünyamin Demir  Feyza Gürbüz  Zeynel Abidin Kuş  Kadir Uğurtan Yilmaz  Mehmet Uzun  Sezai Ercişli 《Erwerbs-Obstbau》2018,60(2):153-160

In this study, an adaptive neuro fuzzy interface system (ANFIS) based predictor was designed to predict the physical properties of four almond types. Measurements of the dimensions, length, width and thickness were carried out for one hundred randomly selected samples of each type. With using these three major perpendicular dimensions, some physical parameters such as projected area, arithmetic mean diameter, geometric mean diameter, sphericity, surface area, volume, shape index and aspect ratio were estimated. In in a various Artificial Neural Network (ANN) structures, ANFIS structure which has given the best results was selected. The parameters analytically estimated and those predicted were given in the form of figures. The root mean-squared error (RMSE) was found to be 0.0001 which is quite low. ANFIS approach has given a superior outcome in the prediction of the Physical Properties of Almond Nuts.  相似文献   

我国畜禽饲料资源中微量元素铁含量分布的调查研究     

马雪莲  张丽阳  王良治  刘东元  吕林  廖秀冬  罗绪刚 《动物营养学报》2019,31(8):3821-3829

本调查旨在研究我国不同地区间各种饲料原料中铁含量分布情况,以及我国畜禽基础饲粮中铁含量,从而为饲粮中合理添补铁提供科学依据。采集全国31个省、直辖市和自治区的37种共3 719个主要畜禽饲料原料,经微波消解后,用IRIS IntrepidⅡ等离子体发射光谱仪测定其中铁含量。结果表明:这37种饲料原料的平均铁含量为21.3~2 472.0 mg/kg,而各类饲料原料铁含量平均值分布规律为:矿物质饲料(1 178 mg/kg)>动物性蛋白质饲料(1 030 mg/kg)>牧草饲料(433 mg/kg)>秸秆饲料(404 mg/kg)>谷物籽实加工副产品(260 mg/kg)>植物性蛋白质饲料(181 mg/kg)>谷物籽实饲料(71.2 mg/kg)。通过比较不同省(自治区)的玉米、小麦和豆粕的铁含量发现,不同省(自治区)同一种饲料原料的铁含量均存在显著差异(P<0.05)。根据全国各地猪、鸡常用的142个饲料配方所计算出的基础饲粮中铁含量为70.6~86.1 mg/kg,如按我国猪、鸡饲养标准(2004)或NRC(1994)畜禽铁营养需要量的要求,基础饲粮中总铁含量可提供猪、鸡生长前期约4/5的铁营养需要量,可提供猪、鸡生长后期的铁营养需要量,但上述估算尚未考虑不同饲料原料中铁的利用率。由此可见,不同种类和不同地区饲料原料中铁含量差异较大;全国各地猪、鸡常用的基础饲料配方中总铁含量可提供猪、鸡整个生长期大部分的铁营养需要量。因此,在实际生产中,应充分考虑不同地区基础饲粮中的总铁含量及其利用率,精准配制饲粮,以满足畜禽高效生产的需要,同时减少铁的添加及其排放对环境的污染。  相似文献   

松苗立枯病的研究Ⅰ、分布损失、征状类型、病原、和栽培影响     

吴友三  高雅  顾嗣芳  刘正南  陈锡芳  钟兆康 《植物保护学报》1963,2(2):179-186

松苗立枯病是东北地区针叶树育苗上的重要问题,其中以落叶松、樟子松、和红松等幼苗发病较重,油松和赤松等幼苗发病为轻。幼苗发病征状有土内腐死、猝倒、立枯、地上腐烂、和一、二年生大苗发生枯萎落叶等五个类型。诱致松苗发生侵染性立枯病的病菌,有 Rhizoctonia、Pythium 和 Fusarium等三种菌类,其中 Rhizoctonia 尤为主要。松苗立枯病发生的轻重与育苗措施有密切关系,地势低洼或位于山脚下坡的苗圃或苗床,一般发病较重。种子经雪藏混砂催芽处理后,能提早种子萌芽、出土和齐苗,有降低发病程度的作用。光照多少对幼苗发病有影响。根据苗圃的调查观察,全光育苗发病率低,遮蔭育苗发病率高;但在沈阳试验结果还不能证实这一点,相反的半遮蔭育苗要好些。  相似文献   

基于PCV3-Cap蛋白间接ELISA检测方法的建立及临床应用     

王俊伟  陈芳洲  库旭钢  李畅  何启盖 《畜牧兽医学报》2019,(2):454-460

为了建立一种敏感和特异的猪圆环病毒3型(PCV3)抗体检测方法,对PCV3-Cap蛋白抗原表位预测发现其抗原表位多聚集在C端(羧基端),而N端前33氨基酸为核定位序列。以截断N端前120个氨基酸后的PCV3ORF2序列为靶基因,设计引物。以PCV3阳性病料为模板,PCR扩增截短的ORF2基因,并将其克隆至pET-30a载体构建重组质粒,并转染至大肠杆菌E.coli BL21感受态细胞,获得重组菌后选择最佳诱导表达条件,采用Ni-NTA亲和层析柱纯化表达产物。以纯化后的重组Cap蛋白作为包被抗原,建立PCV3间接ELISA (indirectELISA)诊断方法,并初步用于临床样品检测。结果:从阳性病料中扩增出大小为285bp的PCV3ORF2基因片段,重组质粒经双酶切和测序鉴定构建成功。采用1mmol·L-1 IPTG诱导,在37℃条件下培养6h重组菌,重组蛋白获最佳表达。Western blot结果表明,该重组蛋白与PCV3阳性血清具有较好的反应原性。ELISA的最佳包被抗原质量浓度为1μg·mL-1,待检血清最佳稀释度为1∶20,酶标抗体最佳工作浓度为1∶5 000。阳性判定值为S/P≥0.273。批内和批间系数均小于10%,表明该方法具有较好的重复性。PCV2阳性血清用本方法检测为阴性,表明该方法有较好的特异性。检测采集的439份临床猪血清,PCV3抗体阳性检出率为60.59%(266/439)。结果表明,本研究建立了一种快速、简便、敏感、特异的猪圆环病毒3型(PCV3)抗体检测方法。  相似文献   

基于PCA的农机购置补贴绩效评价研究     

董倩楠  任维民  刘旭刚  吴海平 《中国农机化学报》2020,(3):219-224

针对农机购置补贴绩效评价过程中存在的数据统计繁杂、人工处理耗费时间长、计算结果易出错、不能及时得到数据结果等问题,本文提出了一种基于PCA进行绩效评价的新方法,并与常用的因子分析法及图表比对法进行了结果比对。结果显示,该方法结果准确,且前三主分量累积比率达到83.16%接近85%(常用阈值),可用前三主分量代替整体研究失分率。经过在近两年的绩效考评工作中实践验证,该方法操作简便,结果简明,特别在数据量庞大情况下该法优势更加明显,适用于农机购置补贴绩效考核评价。  相似文献