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Increase of YBa2Cu3O7 critical currents by Mo substitution and high-pressure oxygen annealing
Los A.,Dabrowski B.,Rogacki K. 한국물리학회 2021 Current Applied Physics Vol.27 No.-
We have previously shown for powders that Mo substitution into the CuO chains of YBa2Cu3O7 can create effective pinning centres which significantly increase the critical current density (jc) in 7 T field by a factor of 4 and 10 at 50 and 60 K, respectively (Rogacki et al., 2006) [1]. The present work reports on the influence of the Mo substitution and high-pressure oxygen annealing on the pinning properties and critical currents of YBa2Cu3- xMoxO7-d by comparing pure (x = 0, d > 0) and substituted (x = 0.03, d < 0) single crystals. Pinning properties have been investigated by measurements of magnetization loops and calculations of jc in the ab-plane, in the temperature range from 2 to 90 K and in fields up to 14 T. Depending on the Mo substitution and the oxygen treatment, several types of pinning centres increasing jc have been revealed and analysed in the frame of Dew- Hughes’ and Kramer’s models.
Controlled electroplating and electromigration in nickel electrodes for nanogap formation
Los Santos Valladares, Luis De,Leon Felix, Lizbet,Bustamante Dominguez, Angel,Mitrelias, Thanos,Sfigakis, Francois,Khondaker, Saiful I,Barnes, Crispin H W,Majima, Yutaka IOP Pub 2010 Nanotechnology Vol.21 No.44
<P>We report the fabrication of nickel nanospaced electrodes by electroplating and electromigration for nanoelectronic devices. Using a conventional electrochemical cell, nanogaps can be obtained by controlling the plating time alone and after a careful optimization of electrodeposition parameters such as electrolyte bath, applied potential, cleaning, etc. During the process, the gap width decreases exponentially with time until the electrode gaps are completely bridged. Once the bridge is formed, the <I>ex situ</I> electromigration technique can reopen the nanogap. When the gap is ∼ 1 nm, tunneling current–voltage characterization shows asymmetry which can be corrected by an external magnetic field. This suggests that charge transfer in the nickel electrodes depends on the orientation of magnetic moments. </P>
de los Angeles Rivera-Juarez, Maria,Rosas-Murrieta, Nora Hilda,Mendieta-Carmona, Victoriano,Hernandez-Pacheco, Raquel Esneidy,Zamora-Ginez, Irma,Rodea-Avila, Carlos,Apresa-Garcia, Teresa,Garay-Villar, Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.3
Sialyltransferase gene expression is altered in several cancers, including examples in the cervix. Transcriptional regulation of the responsible genes depends on different promoters. We aimed to determine the association of single-nucleotide polymorphisms in the B3 promoter of the ST3GAL4 gene and the P1 promoter of the ST6GAL1 gene with cervical premalignant lesions or cervical cancer. A blood sample and/or cervical scrapes were obtained from 104 women with normal cytology, 154 with premalignant lesions and 100 with cervical cancer. We also included 119 blood samples of random donors. The polymorphisms were identified by sequencing from PCR products. For the B3 promoter, a fragment of 506 bp (from nucleotide -408 to +98) was analyzed, and for the P1 promoter a 490 bp (-326 to +164) fragment. The polymorphism analysis showed that at SNP rs10893506, genotypes CC and CT of the ST3GAL4 B3 promoter were associated with the presence of premalignant lesions (OR=2.89; 95%CI 1.72-4.85) and cervical cancer (OR=2.23; 95%CI 1.27-3.91). We detected only one allele of each polymorphism in the ST6GAL1 P1 promoter. We did not detect any genetic variability in the P1 promoter region in our study population. Our results suggest that the rs10893506 polymorphism -22C/T may increase susceptibility to premalignant and malignant lesions of the cervix.
Attaching Thiolated Superconductor Grains on Gold Surfaces for Nanoelectronics Applications
De Los Santos Valladares, Luis,Bustamante Dominguez, Angel,Llandro, Justin,Suzuki, Seiichi,Mitrelias, Thanos,Bellido Quispe, Richard,Barnes, Crispin H. W.,Majima, Yutaka IOP Publishing 2010 Japanese journal of applied physics Vol.49 No.r9
de los Reyes, Benildo G,Mohanty, Bijayalaxmi,Yun, Song Joong,Park, Myoung-Ryoul,Lee, Dong-Yup Springer US 2015 Rice Vol.8 No.-
<P>Dissecting the upstream regulatory architecture of rice genes and their cognate regulator proteins is at the core of network biology and its applications to comparative functional genomics. With the rapidly advancing comparative genomics resources in the genus <I>Oryza</I>, a reference genome annotation that defines the various cis-elements and trans-acting factors that interface each gene locus with various intrinsic and extrinsic signals for growth, development, reproduction and adaptation must be established to facilitate the understanding of phenotypic variation in the context of regulatory networks. Such information is also important to establish the foundation for mining non-coding sequence variation that defines novel alleles and epialleles across the enormous phenotypic diversity represented in rice germplasm. This review presents a synthesis of the state of knowledge and consensus trends regarding the various cis-acting and trans-acting components that define spatio-temporal regulation of rice genes based on representative examples from both foundational studies in other model and non-model plants, and more recent studies in rice. The goal is to summarize the baseline for systematic upstream sequence annotation of the rapidly advancing genome sequence resources in <I>Oryza</I> in preparation for genus-wide functional genomics. Perspectives on the potential applications of such information for gene discovery, network engineering and genomics-enabled rice breeding are also discussed.</P>
Alexander De Los Reyes,Elizabeth Ann Prieto,Karim Omambac,Jeremy Porquez,Lorenzo Lopez Jr.,Karl Cedric Gonzales,John Daniel Vasquez,Mae Agatha Tumanguil,Joselito Muldera,Kohji Yamamoto,Masahiko Tani,A 한국물리학회 2017 Current Applied Physics Vol.17 No.4
We investigate the effects of an externally applied magnetic field on the terahertz (THz) emission of Gallium Manganese Arsenide (GaMnAs) films grown via molecular beam epitaxy (MBE). Results show that low Mn-doping in GaMnAs resulted to increased THz emission as compared with a SI-GaAs substrate. Further increase in Mn-doping content resulted to a comparably less THz emission, which is attributed to reduced crystallinity and higher free-carrier absorption. Under an external magnetic field, the contributions of the Bup and Bdown-related THz emission were observed to be asymmetric: possibly due to intrinsic magnetic properties of GaMnAs.
María de los Ángeles Carrasco-Ruiz,Laura G. Hernández-Aragón,Jesús Ramsés Chávez-Ríos,Jorge Rodríguez-Antolín,Pablo Pacheco,Margarita Martínez-Gómez,Estela Cuevas-Romero,Francisco Castelán 대한배뇨장애요실금학회 2018 International Neurourology Journal Vol.22 No.3
Purpose: To characterize the relationship between serum estradiol levels and the expression of glucose transporter type 4 (Glut4) in the pubococcygeus and iliococcygeus muscles in female rats. Methods: The muscles were excised from virgin rats during the metestrus and proestrus stages of the estrous cycle, and from sham and ovariectomized rats implanted with empty or estradiol benzoate–filled capsules. The expression of estrogen receptors (ERs) was inspected in the muscles at metestrus and proestrus. Relative Glut4 expression, glycogen content, and serum glucose levels were measured. Appropriate statistical tests were done to identify significant differences (P≤0.05). Results: The pubococcygeus and iliococcygeus muscles expressed ERα and ERβ. Glut4 expression and glycogen content in the pubococcygeus muscle were higher at proestrus than at metestrus. No significant changes were observed in the iliococcygeus muscle. In ovariectomized rats, the administration of estradiol benzoate increased Glut4 expression and glycogen content in the pubococcygeus muscle alone. Conclusions: High serum estradiol levels increased Glut4 expression and glycogen content in the pubococcygeus muscle, but not in the iliococcygeus muscle.