Publications (13)27.49 Total impact
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Article: Dietary total antioxidant capacity is associated with diet and plasma antioxidant status in healthy young adults.
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ABSTRACT: Dietary total antioxidant capacity (TAC), based on the cumulative antioxidant activities of all the antioxidants present in food, has been shown to be inversely associated with risks of chronic diseases. However, dietary TAC has not been validated for its relevance in a healthy young population or for reliability and predictability for antioxidant status. Our study aimed to validate TAC as a tool in assessing antioxidant intake and to investigate whether dietary TAC predicts plasma antioxidant status in a healthy young population. Sixty healthy, nonsmoking college students at the University of Connecticut ages 18 to 25 years were recruited. Thirty-day food records and two 12-hour fasting blood samples were collected for dietary and plasma antioxidant assessments. After adjustment for total energy intake, TAC from diet and supplement was positively correlated with intakes of carotenoids (P<0.01), beta carotene (P<0.05), β-cryptoxanthin (P<0.05), flavonoids (P<0.0001), isoflavones (P<0.01), flavan-3-ols (P<0.01), flavones (P<0.05), and flavonols (P<0.0001). Dietary TAC was an independent predictor of plasma TAC determined by vitamin C equivalent antioxidant capacity (P<0.01) and by ferric-reducing ability of plasma (P<0.0001), plasma glutathione peroxidase (P<0.01), red blood cell glutathione peroxidase (P<0.05), α-tocopherol (P<0.05), and lutein (P<0.05). Results were similar for TAC from diet sources only. The findings suggest that dietary TAC is a good predictor of dietary and plasma antioxidant status in this sample of young adult men and women.Journal of the Academy of Nutrition and Dietetics. 10/2012; 112(10):1626-35. -
Article: Sickle cell disease incidence among newborns in New York State by maternal race/ethnicity and nativity.
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ABSTRACT: Purpose:Sickle cell disease is estimated to occur in 1:300-400 African-American births, with higher rates among immigrants from Africa and the Caribbean, and is less common among Hispanic births. This study determined sickle cell disease incidence among New York State newborns stratified by maternal race/ethnicity and nativity.Methods:Newborns with confirmed sickle cell disease born to New York State residents were identified by the New York State newborn screening program for the years 2000-2008 and matched to birth records to obtain birth and maternal information. Annual incidence rates were computed and bivariate analyses were conducted to examine associations with maternal race/ethnicity and nativity.Results:From 2000 to 2008, 1,911 New York State newborns were diagnosed with sickle cell disease and matched to the birth certificate files. One in every 1,146 live births was diagnosed with sickle cell disease. Newborns of non-Hispanic black mothers accounted for 86% of sickle cell disease cases whereas newborns of Hispanic mothers accounted for 12% of cases. The estimated incidence was 1:230 live births for non-Hispanic black mothers, 1:2,320 births for Hispanic mothers, and 1:41,647 births for non-Hispanic white mothers. Newborns of foreign-born non-Hispanic black mothers had a twofold higher incidence of sickle cell disease than those born to US-born non-Hispanic black mothers (P < 0.001).Conclusion:This study provides the first US estimates of sickle cell disease incidence by maternal nativity. Women born outside the United States account for the majority of children with sickle cell disease born in New York State. Such findings identify at-risk populations and inform outreach activities that promote ongoing, high-quality medical management to affected children.Genet Med advance online publication 27 September 2012Genetics in Medicine (2012); doi:10.1038/gim.2012.128.Genetics in medicine: official journal of the American College of Medical Genetics 09/2012; · 3.92 Impact Factor -
Article: The complete mitochondrial genome of the dragon swallowtail,Sericinus montela Gray(Lepidoptera:Papilionidae) and its phylogenetic implication
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ABSTRACT: The phylogenetic relationship between the zerynthiids and the other groups of Papilionidae has long been a controversial issue.In this study,the complete nucleotide sequences of the mitochondrial genome(mitogenome) of Sericinus montela belonging to the zerynthiids was determined using long PCR and conserved primer walking approaches.Meanwhile,the phylogenetic analysis of this species with other representative papilionid species was conducted to clarify their phylogenetic relationships on the mitogenomic level.The results showed that the entire mitochondrial DNA(mtDNA) molecule is 15 242 bp in length with the content of A,T,G and C of 40.1%,40.8%,7.4% and 11.7%,respectively,and its nucleotide composition of the genome is highly A+T biased(80.8%);all the 13 protein coding genes(PCGs) use standard initiation codons ATN,and all the PCGs use common stop codon(TAA),except for the ND4 and ND4L genes,which terminate with a single T;all tRNA genes form a typical clover-leaf secondary structure,except for the tRNASer(AGN),whose DHU arm forms a simple loop;there are twelve intergenic spacer regions ranging from 2 to 65 bp in size,and fifteen overlaps ranging from 1 to 8 bp in size in the mitogenome sequence.The neighbor joining and maximum parsimony phylogenetic analyses based on the 13 PCG sequences showed that Sericins montela and Luehdorfia chinensis form a clade that is sister to the Parnassius bremeri,suggesting that they should be designated as a taxon of tribal level within the subfamily Parnassiinae in the family of Papilionidae. 锯凤蝶类与凤蝶科其他类群的系统发生关系及其分类学地位一直存在争议。本研究采用PCR和long PCR技术测定了属于锯凤蝶类的丝带凤蝶Sericinus montelus线粒体基因组全序列;结合已有的其他凤蝶科物种的相应序列数据,基于13个蛋白质编码基因重建了凤蝶科主要类群的系统发生树,探讨了它们 之间的系统发生关系。基因组分析结果表明:丝带凤蝶线粒体基因组全长15242bp,包括13个编码蛋白基因(ATP6,ATP8,COⅠ-Ⅲ,ND1- 6,ND4L和Cytb)、22个tRNA基因、16S和12SrRNA基因以及非编码的控制区;基因组A,T,G和C含量分别为40.1%,40.8% ,7.4%和11.7%,表现出明显的AT偏倚。所有的蛋白质编码基因都使用标准的起始密码子(ATN);除ND4和ND4L基因使用单个的T作为终止密 码子外,其余蛋白编码基因都使用了标准的终止密码子(TAA)。除丝氨酸tRNA的二氢尿苷突环缺失外,所有tRNA基因都形成典型的三叶草型结构。基因 组中共存在12个大小介于2~65bp之间的基因间隔区以及15个大小介于1~8bp之间的基因重叠区,其中,存在于COⅡ和tRNALys之间的24b p的间隔区在其他鳞翅目昆虫中未曾见到。以邻接法和最大简约法并基于13个蛋白质编码基因序列对凤蝶科进行了系统发生分析。结果显示,丝带凤蝶和中华虎凤 蝶Luehdorfia chinensis先构成一个支系,再和冰清绢蝶Parnassius bremeri构成姊妹群;表明锯凤蝶类应作为族级分类单元归于凤蝶科下的绢蝶亚科。Acta Entomologica Sinica. 01/2012; 55(1):91-100. -
Article: Performance of an Integrated Gasification Combined Cycle System with Different System Integration Options
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ABSTRACT: The integrated gasification combined cycle system includes a gasifier, air separation unit (ASU), heat recovery steam generator (HRSG), syngas coolers, and combined cycle system. The HRSG, syngas coolers, ASU, and gas turbine can affect the system efficiency, and their integration is of importance. This work investigates the integration of the HRSG and syngas coolers and the integration of the gas turbine and the ASU. First, it is found that the best match between the HRSG and syngas coolers is for the HRSG to provide high-pressure water to the syngas coolers, which return superheated steam back to the HRSG. Second, from the viewpoint of system efficiency, it is found that a lower integration air separation coefficient (Xas) or higher nitrogen re-injection coefficient (Xgn) is acceptable for an integrated gasification combined cycle system with a low-pressure ASU. A lower Xas is recommended for Xgn = 0%, and Xas = 50% is acceptable for Xgn = 100%. For Xas = 0%, Xgn = 30% is recommended, and a higher Xgn is recommended for Xas = 100%.02/2010; -
Article: Self-Assembly of a Series of Metal−Organic Frameworks Based on 4-Pyridyl-1,2,4-triazole and Copper(II) Ion
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ABSTRACT: Using 4-pyridyl-1,2,4-triazole (pytrz) as ligand and a variety of copper(II) salts, nine copper(II) coordination polymers, {[Cu(pytrz)(OH)]X}n (X = Cl−, (1); Br−, (2); (NO3−)·H2O, (3); BF4−, (4); CF3SO3−, (5)), {[Cu(pytrz)2](BF4)2·2H2O}n (6), {[Cu3(pytrz)2(OH)2(NO2)2(H2O)2](NO3)2·H2O}n (7), {[Cu3(pytrz)2(OH)2(H2O)2](SO4)2·10H2O}n (8), and {[Cu4(pytrz)4(OH)2(H2O)2](SiF6)3·11.5H2O}n (9), were prepared and their crystal structures were determined via single-crystal X-ray diffraction. Complexes 1−3 crystallize in a chiral space group P212121 and exhibits a three-dimensional (3D) chiral framework constructed by left-handed (CuO)n helixes (L). Complex 4 consists of (CuO)n helixes with the opposite chirality (R) and have the analogous cationic framework as 1. The structure of 5 is constructed through (CuO)n zigzag chains and represents the same (327583)(372) topology as 1−4. Complex 6 exhibits a novel two-dimensional (2D) Kagomé topology with bidentate pytrz. The structures of complexes 7 and 8 are based on trinuclear Cu3 clusters, and both display a 2D 44-net when only considering pytrz as bridges. In 7, the NO2− anions act as bridges to connect the 44-nets to form a 3D α-polonium-type network. Complex 9 have four characteristically independent Cu2+ ions and construct a tetranuclear Cu4 cluster, and the Cu4 clusters are bridged by tridentate pytrz to form a 3D porous cationic coordination polymer.05/2009; -
Article: A heterometallic porous material for hydrogen adsorption.
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ABSTRACT: Two kinds of heterometallic complexes, {[Sm2(L)6Co2][Co(H2O)6].3H2O}n (Sm-Co) and {[Sm2(L)6Zn3(H2O)6].1.5H2O}n (Sm-Zn) (H2L=oxydiacetic acid), were synthesized under hydrothermal conditions. In Sm-Co, each L chelates to one Sm3+ center and bonds to two Co2+ ions in an anti-anti configuration. Sm and Co atoms are arrayed alternatively and connected by O-C-O bridges to form a cubic octahedral cage as the secondary building unit. Consequently, topological NaCl nets with high symmetry in the cubic space group Fdc have been constructed. It is interesting to note that Sm-Co contains interesting 2-fold interpenetrating 3D hydrogen-bonding supramolecular networks while in Sm-Zn each L adopts a syn-syn configuration to link two Zn2+ ions. Carboxylate groups bridge adjacent Sm and Zn atoms to create two kinds of metallocycles, Sm2(COO)4Zn2 and Sm6(COO)12Zn6, to be further assembled into a highly ordered 3D nanotubular structure. Sm-Zn represents the largest porous material among the heterometallic coordination polymers and the first example in the investigation of hydrogen adsorption. Sm-Zn possesses hydrogen storage capacity of up to 1.19 wt % at 77 K and 0.54 wt % at 298 K, respectively.Inorganic Chemistry 06/2007; 46(11):4530-4. · 4.60 Impact Factor -
Article: Tuned triazolatesilver(I) luminescent complexes from zero- to three-dimensionality based on bi- to tetratopic bridged ligands.
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ABSTRACT: The self-assembly of silver(I) salts with bitopic triazole ligands 4-(salicylideneamino)-1,2,4-triazole (L1) and 4-(2-pyridinyl)-1,2,4-triazole (L2) produced dinuclear complexes and a 1D molecular-ladder coordination polymer, while the reaction of tritopic ligand 4-(3-pyridinyl)-1,2,4-triazole (L3) with AgClO4 afforded a right-handed helical 2D network with (4,4) topology, a meso layer constructed via left- and right-handed helical chains with AgBF4, and a 2D 4.8(2) net containing no helical chain with AgNO3. Using a tetratopic triazole ligand 2,6-bis(4-triazolyl)pyridine (L4), a 3D coordination polymer was isolated. This complex contains a cationic 4.63 network with rhombic channels, accepting two columns of uncoordinated ClO4(-) anions filling into every central cavity. Our results show that (i) the increase of coordination sites of the ligands is an effective route to obtaining higher-dimensional structures and (ii) anions could influence the configuration of the ligand to tune the coordination network topology from those with helical chains to those without. In the solid state, all of the complexes exhibit strong fluorescent emission bands, which may be assigned to intraligand fluorescent emission. The luminescent properties of these complexes in a water solution varied from blue light to green light at ambient temperature.Inorganic Chemistry 04/2007; 46(6):2002-10. · 4.60 Impact Factor -
Article: Self-assembly and anion-exchange properties of a discrete cage and 3D coordination networks based on cage structures.
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ABSTRACT: By using tridentate ligand 4-(3-pyridinyl)-1,2,4-triazole (pytrz), cage-like complexes of {[Cu(mu2-pytrz)2](ClO4)(SO4)0.5C2H5OH.0.25 H2O}6 (1), {[Cu3(mu3-pytrz)4(mu2-Cl)2(H2O)2](ClO4)2Cl(2).2 H2O}n (2), and {[Cu3(mu3-pytrz)3(mu3-O)(H2O)3](ClO4)2.5(BF4)(1.5)5.25 H2O}n (3) have been synthesized with different copper(II) salts. Complex 1 represents the second example of a M6L12 metal-organic octahedron with an overall Th symmetry. Complex 2 is constructed from a 3(8) cage-building unit (CBU) and each CBU connects six neighboring cages to give the first 3D metal-organic framework (MOF) based on octahedral M6L12. Complex 3 is built from Cu24(pytrz)12 CBUs with the trinuclear copper clusters serving as second building units (SBUs) and decorating each corner of the M24L12 polyhedron. The Cu24(pytrz)12 building unit is linked by extra ligands to give an extended 3D framework that has the formula Cu24(pytrz)24 and possesses a CaB6 topology. The mixed anions ClO4- and BF4- in 3 are both included in the inner cavity of the cage and can be completely exchanged by ClO4- through the open windows of the cage, as evidenced by the crystal structure of the 3D MOF {[Cu3(mu3-pytrz)3(mu3-O)(H2O)3](ClO4)(4)4.5 H2O}n (4). Complex 4 can also be synthesized when employing 1 as a precursor in an extensive study of the anion-exchange reaction. This represents the first successful conversion of a discrete cage into a 3D coordination network based on a cage structure. Complex 2 remains invariable during anion-exchange reactions because uncoordinated Cl- ions are located in the comparatively small inner cavity.Chemistry 02/2007; 13(29):8131-8. · 5.93 Impact Factor -
Article: Synthesis, crystal structure, and characterization of new tetranuclear Ag(I) complexes with triazole bridges.
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ABSTRACT: The self-assembly of Ag(I) ions with 3,5-dimethyl-4-amino-1,2,4-triazole (L1) and 4-salicylideneamino-1,2,4-triazole (L2) gave two novel complexes, [Ag4(mu2-L1)6][Ag4(mu2-L1)6(CH3CN)2](ClO4)8.2H2O (1) and [Ag4(mu2-L2)6(CH3CN)2](AsF6)4.2H2O (2), both of which contain tetranuclearic clusters constructed via Ag(I) ions and six N1,N2-bridged triazoles with a Ag4N12 core. When 4-(6-amino-2-pyridyl)-1,2,4-triazole (L3) was employed, {[Ag4(mu2-L3)4(mu3-L3)2](CF3SO3)4.H2O}n (3), {[Ag4(mu2-L3)4(mu3-L3)2](ClO4)4}n (4), and {[Ag4(mu2-L3)2(mu3-L3)4](PF6)4.CH3CN.0.75H2O}n (5) were isolated. 3 and 4 are 1D polymers, while 5 is a 2D polymer. 1D and 2D coordination polymers are constructed via the self-assembly of Ag4N12 cores as secondary building units (SBUs). The connection of these SBUs can be represented as a ladderlike structure for 1D polymers and a 4.8(2) net for 2D polymers. Electrospray ionization mass spectrometry measurements and NMR (1H and 13C) studies demonstrate that the tetranuclear SBU retains its integrity and the coordination polymers decompose into the tetranuclear Ag4N12 core in solution. 2 exhibits blue emission in the solid state and green emission in solution at ambient temperature. Strong blue fluorescence for complexes 3-5 in the solid state can be assigned to the intraligand fluorescent emission.Inorganic Chemistry 08/2006; 45(15):5822-9. · 4.60 Impact Factor -
Article: Synthesis of a series of 4-pyridyl-1,2,4-triazole-containing cadmium(II) luminescent complexes.
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ABSTRACT: Using two 4-substitued triazole ligands, 4-(pyrid-2-yl)-1,2,4-triazole (L(1)) and 4-(pyrid-3-yl)-1,2,4-triazole (L(2)), a series of novel triazole-cadmium(II) complexes varying from zero- to three-dimensional have been prepared and their crystal structures determined via single-crystal X-ray diffraction. [Cd(2)(micro(2)-L(1))(3)(L(1))(2)(NO(3))(mu(2)-NO(3))(H(2)O)(2)](NO(3))(2).1.75H(2)O (1) is a binuclear complex containing bidendate, monodedate and free nitrate anions. When the bridging anions SCN(-) and dca (dca = N(CN)(2)(-)) were added to the reaction system of 1, one-dimensional (1D) [Cd(L(1))(2)(NCS)(2)](n) (2) and two-dimensional (2D) [Cd(L(1))(2)(dca)(2)](n) (3) were isolated, respectively. When L(2) instead of L(1) was used, [Cd(L(2))(2)(NCS)(2)(H(2)O)(2)] (4) and 1D [Cd(L(2))(2)(dca)(2)](n) (5) were obtained. When the ratio of Cd to L(2) was changed from 1:2 to 1:1 in the reaction system of 5, three-dimensional (3D) {[Cd(3)(micro(2)-L(2))(3)(dca)(6)].0.75H(2)O}(n) (6) with 1D microporous channels along the a direction was isolated. Further investigations on other Cd(ii) salts and the L(2) ligand in a Cd to L(2) ratio of 1:1, an unexpected complex [Cd(mu(2)-L(2))(mu(3)-SO(4))(H(2)O)](n) (7) with a 3D open framework was obtained. All of the complexes exhibit strong blue fluorescence emission bands in the solid state at ambient temperature, of which the excitation and emission maxima are red-shifted to longer wavelength as compared to those in water. Powder X-ray diffraction and thermal studies were used to investigate the bulk nature of the 3D coordination polymers 6 and 7.Dalton Transactions 03/2006; · 3.84 Impact Factor -
Article: Channel inclusion complexation of organometallics: dipolar alignment for second harmonic generation
04/2002; -
Article: 2D and 3D sulfate-water supramolecular networks templated via triazole-nickel(II) complexes
Inorganica Chimica Acta. 359(12):3824-3830. -
Article: A porous 3d-4f heterometallic metal–organic framework for hydrogen storage
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ABSTRACT: A heterometallic metal–organic framework, {[Ce(oda)3Zn1.5(H2O)3]·0.75H2O}n (1, H2oda = oxydiacetic acid), has been synthesized under hydrothermal condition. The single-crystal X-ray diffraction analysis reveals that compound 1 belongs to hexagonal crystal system with space group P6/mcc and exhibits 3D porous framework. The hydrogen adsorption experiments suggest that 1 possesses reversible hydrogen storage capacity, up to 1.34 wt.% at 77 K and 0.86 wt.% at 298 K, respectively.International Journal of Hydrogen Energy.
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Institutions
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2012
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Albany State University
Albany, GA, USA
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2006–2007
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Nankai University
- • Department of Chemistry
- • The State Key Laboratory of Elemento-Organic Chemistry
Tianjin, Tianjin Shi, China
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