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Ren, X.Y.,Zhao, C.X.,Niu, C.Y.,Wang, J.Q.,Jia, Y.,Cho, J.H. North-Holland 2016 Physics letters. Section A. Vol.380 No.46
<P>As the analog of carbon allotropes, new three-dimensional (3D) boron nitride (BN) allotropes have attracted much attention of researchers due to their great importance in fundamental sciences and wide practical applications. Here, based on first-principles density-functional theory calculations, we predict two new stable BN allotropes: One is H-18-BN with the P (6) over bar m2 (D-3h(1)) symmetry containing eighteen atoms in the hexagonal unit cell and the other is Rh6-BN with the R (3) over barm (C-3v(5)) symmetry containing six atoms in the rhombohedral primitive unit cell. The dynamic stabilities of the two structures are examined through the phonon spectrum analysis as well as molecular dynamics simulations, whereas the mechanical properties are analyzed by elastic constants, bulk modulus and shear modulus. From the analysis of the enthalpy evolution with respect to pressure, we find that h-BN can be transformed into either H-18-BN or RH6-BN structure under a higher pressure of similar to 15 GPa. We also find that both the H-18-BN and Rh6-BN allotropes are brittle materials with indirect band gaps of 2.31 and 4.48 eV, respectively. The simulated XRD spectra provide detailed structural information of H-18-BN and Rh6-BN for future experimental examinations. Our findings not only greatly enrich the existing structural family of 3D-BN materials but also stimulate further experiments. (C) 2016 Elsevier B.V. All rights reserved.</P>
Zhang, Y.,Jia, R.X.,Pan, M.H.,Lu, Y.,Cui, X.S.,Kim, N.H.,Sun, S.C. Butterworths, etc 2017 Theriogenology Vol. No.
T-2 toxin is a type A mycotoxin produced by various Fusarium species, while HT-2 toxin is a major metabolite of T-2 toxin. Both T-2 toxin and HT-2 toxin are known to have deleterious effects on animals. Our previous work showed that HT-2 treatment caused the failure of porcine oocyte maturation. In this study, we reported that HT-2 also affected porcine embryo development. In HT-2 toxin treated group, all the percentages of embryos in 2-cell, 4-cell and blastocyst stage were significantly lower compared with those in control groups. We then explored the causes from the epigenetic modification aspect of the oocytes. The analysis of fluorescence intensity showed that 5-methyl cytosine (5 mC) level was increased after exposure to HT-2 toxin in porcine oocytes, indicating that the general DNA methylation level increased in the treated porcine oocytes. In addition, histone modifications were also affected, since our results showed that H3K4me2 and H3K9me2 levels were increased in the oocytes from HT-2-treated group. Therefore, our results indicated that HT-2 toxin decreased porcine embryo developmental competence through altering the epigenetic modifications of oocytes.
Synthesis and Characterization of hollow Fe_3O_4 submicrospheres by a Simple Solvothermal Synthesis
L. F. Duan,S. S. Jia,T. H. Wang,L. J. Zhao 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.5
Hollow single crystal Fe_3O_4 submicrospheres, which exhibit excellent magnetic properties, have been synthesized by a simple solvothermal process. These Fe3O4 particles have nanocrystallites with an average diameter of about 300 nm and are constructed with a hollow sphere structure that has an inside diameter of about 70 nm. The growth of the hollow Fe_3O_4 submicrospheres involves the cooperation of Ostwald ripening and oriented re-aggregation with increasing reaction time. As the oriented aggregation continues, adjacent nanocrystals fuse together along the (311) direction and the final product is formed as hollow spheres. Optional re-aggregation of the Fe3O4 hollow spheres may happen in the EG and N_2H_4·H_2O solution. The synthesized Fe_3O_4 particles show different magnetic properties and can be adjustable with morphological variation.
K. W. Shao,W. H. Zhou,K. Gao,X. G. Zhu,P. Jia,Y. Li 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
Catastrophic brittle failure prevents the application of bulk metallic glasses (BMGs).The brittle La69Co17Al14BMG showslarge compressive plasticity when compressed in constrained conditions. Here the compressive plasticity of this BMG wassystematically studied by decreasing aspect ratio (height/diameter) of the samples in uniaxial compression and the brittleductiletransition occurs at an aspect ratio of 0.36. With the increase of the plasticity (decrease of the aspect ratio), the hardnessdecreases firstly and then increases, however, the relaxation enthalpy indicating its structure increases monotonically. Our findings provide a powerful experimental support for the application of brittle La-based BMGs.
Search for light tetraquark states in ϒ(1S) and ϒ(2S) decays
Jia, S.,Shen, C. P.,Yuan, C. Z.,Adachi, I.,Ahn, J. K.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Behera, P.,Berge American Physical Society 2017 Physical review. D Vol.96 No.11
<P>We search for the J(PC) = 0(--) and 1(+-) light tetraquark states with masses up to 2.46 GeV/c(2) in gamma(1S) and gamma(2S) decays with data samples of (102 +/- 2) million and (158 +/- 4) million events, respectively, collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90% credibility level (C. L.) upper limits on their branching fractions in Upsilon(1S) and Upsilon(2S) decays are obtained. The inclusive branching fractions of the Upsilon(1S) and Upsilon(2S) decays into final states with f(1)(1285) are measured to be B(Upsilon(1S) -> f(1)(1285) + anything) = (46 +/- 28(stat) +/- 13(syst)) x 10(-4) and B(Upsilon(2S) -> f(1)(1285) + anything) = (22 +/- 15(stat) +/- 6.3(syst)) x 10(-4). The measured chi(b2) -> J/Psi + anything branching fraction is measured to be (1.50 +/- 0.34(stat) +/- 0.22(syst)) x 10(-3), and 90% C. L. upper limits for the chi(b0;b1) -> J/Psi + anything branching fractions are found to be 2.3 x 10(-3) and 1.1 x 10(-3), respectively. For B(chi(b1) -> omega + anything), the branching fraction is measured to be (4.9 +/- 1.3(stat) +/- 0.6(syst) x 10(-2). All results reported here are the first measurements for these modes.</P>
Jia, B.,Jeong, H.I.,Kim, K.H.,Jeon, C.O. Elsevier Science Publishers 2016 Journal of biotechnology Vol.226 No.-
<P>Zhongshania aliphaticivorans SM-2(T), a degrader of aliphatic hydrocarbons, is a Gram-negative, rod-shaped, flagellated, facultatively aerobic bacterium. Here, we report the genome sequence of strain SM-2(T), which has a size of 4,204,359 bp with 44 tRNAs, 9 rRNAs, and 3664 protein-coding genes. In addition, several genes encoding aliphatic hydrocarbon degraders (alkane 1-monooxygenase, haloalkane dehalogenase, and cytochrome P450) were detected in the genome shedding light on the function of pollutants degradation. (C) 2016 Elsevier B.V. All rights reserved.</P>
Observation of e+e−→γχc1 and search for e+e−→γχc0 , γχc2 , and γηc at s near 10.6 GeV at Belle
Jia, S.,Wang, X. L.,Shen, C. P.,Yuan, C. Z.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Bansal, V.,Behera, P.,Beleñ,o, C.,Berger, M.,Bhu American Physical Society 2018 Physical Review D Vol.98 No.9
Integrative view of 2-oxoglutarate/Fe(II)-dependent oxygenase diversity and functions in bacteria
Jia, B.,Jia, X.,Kim, K.H.,Jeon, C.O. Elsevier/North-Holland 2017 Biochimica et biophysica acta, General subjects Vol.1861 No.2
Background: The 2-oxoglutarate/Fe(II)-dependent oxygenase (2OG oxygenase) superfamily is extremely diverse and includes enzymes responsible for protein modification, DNA and mRNA repair, and synthesis of secondary metabolites. Methods: To investigate the evolutionary relationship and make functional inferences within this remarkably diverse superfamily in bacteria, we used a protein sequence similarity network and other bioinformatics tools to analyze the bacterial proteins in the superfamily. Results: The network based on experimentally characterized 2OG oxygenases reflects functional clustering. Networks based on all of the bacterial 2OG oxygenases from the Interpro database indicate that only few proteins in this superfamily are functionally defined. The uneven distribution of the enzymes supports the hypothesis that horizontal gene transfer plays an important role in 2OG oxygenase evolution. A hydrophobic tyrosine residue binding the primary substrates at the N-termini is conserved. At the C-termini, the iron-binding, oxoglutarate-binding, and hydrophobic motifs are conserved and coevolved. Considering the proteins in the family are largely unexplored, we annotated them by the Pfam database and hundreds of novel and multi-domain proteins are discovered. Among them, a two-domain protein containing an N-terminal peroxiredoxin domain and a C-terminal 2OG oxygenase domain was characterized enzymatically. The results show that the enzyme could catalyze the reduction of peroxide using 2-oxoglutarate as an electron donor. Conclusions: Our observations suggest relatively low evolutionary pressure on the bacterial 2OG oxygenases and a straightforward electron transfer pathway catalyzed by the two-domain 2OG oxygenase. General significance: This work enables an expanded understanding of the diversity, evolution, and functions of bacterial 2OG oxygenases.
Effects of Genotypes on In Vitro Maturation and Fertilization of Frozen-Thawed Porcine Oocytes
Jia, Y. H.,H. J. Jin,M. S. Wee,H. T. Cheong,B. K. Yang,C. K. Park 한국동물생명공학회(구 한국동물번식학회) 2005 Reproductive & developmental biology Vol.29 No.4
In the present study, we investigated the effects of genotypes on in vitro maturation and fertilization in porcine fresh/frozen-thawed oocytes. The porcine cumulus-oocyte complexes (COCs) were divided into four groups according to whether they were: (1) in vitro matured; (2) cryopreserved and in vitro matured; (3) in vitro fertilized and (4) cryopreserved, and in vitro fertilized. Maturation of porcine COCs was accomplished by incubation in NCSU23 medium. Immature oocytes were cryopreserved by Open Pulled Straws (OPS) method according to Vajta et al., (1998). Oocytes stained by Acetic-Orcein method were observed under the microscope. DNA extracted from the ovaries was analyzed by RAPD (random amplified polymorphic DNA) and SSCP (single strand conformational polymorphisrrt) method. The rates of oocytes maturation and fertilization were significantly high in AA genotype. The results indicated that in vitro maturation and fertilization in porcine fresh/frozen-thawed oocytes may be affected by genotypes in pigs.