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6 results on '"Serrano, B. R."'

1. Broadband spintronic detection of the absolute field strength of terahertz electromagnetic pulses

Author

Chekhov, A. L., Behovits, Y., Martens, U., Serrano, B. R., Wolf, M., Seifert, T. S., Muenzenberg, M., and Kampfrath, T.

Subjects
Physics - Optics
Abstract

We demonstrate detection of broadband intense terahertz electromagnetic pulses by Zeeman-torque sampling (ZTS). Our approach is based on magneto-optic probing of the Zeeman torque the terahertz magnetic field exerts on the magnetization of a ferromagnet. Using an 8 nm thick iron film as sensor, we detect pulses from a silicon-based spintronic terahertz emitter with bandwidth 0.1-11 THz and peak field >0.1 MV/cm. Static calibration provides access to absolute transient THz field strengths. We show relevant added values of ZTS compared to electro-optic sampling (EOS): an absolute and echo-free transfer function with simple frequency dependence, linearity even at high terahertz field amplitudes, the straightforward calibration of EOS response functions and the modulation of the polarization-sensitive direction by an external AC magnetic field. Consequently, ZTS has interesting applications even beyond the accurate characterization of broadband high-field terahertz pulses for nonlinear terahertz spectroscopy.

Published
2023

3. Effect of quercetin on granulosa cells development from hierarchical follicles in chicken.

Author

Li, T., Feng, Y., Chen, Z., Hou, Q., Serrano, B. R., Barcenas, A. R., Wu, P., Zhao, W., and Shen, M.

Subjects
GRANULOSA cells, QUERCETIN, OVARIAN follicle, PROLIFERATING cell nuclear antigen, CHICKENS, PROGESTERONE receptors, ENZYME-linked immunosorbent assay, GENE expression
Abstract

1. The bioflavonoid quercetin is a biologically active component, but its functional regulation of granulosa cells (GCs) during chicken follicular development is little studied. To investigate the effect of quercetin on follicular development in laying hens, an in vitro study was conducted on granulosa cells from hierarchical follicles treated with quercetin. 2. The effect of quercetin on cell activity, proliferation and apoptosis of granulosa cells was detected by CCK-8, EdU and apoptosis assays. The effect on progesterone secretion from granulosa cells was investigated by enzyme-linked immunosorbent assay (ELISA). Expression of proliferating cell nuclear antigen (PCNA) mRNA and oestrogen receptors (ERs), as well as the expression of steroid acute regulatory protein (StAR), cytochrome P450 cholesterol side chain cleavage enzyme (P450scc) and 3β-hydroxysteroid dehydrogenase (3β-HSD) mRNA during progesterone synthesis, were measured by real-time quantitative polymerase chain reaction (RT-qPCR). PCNA, StAR and CYP11A1 protein expression levels were detected using Western blotting (WB). 3. The results showed that treatment with quercetin in granulosa cells significantly enhanced cell vitality and proliferation, reduced apoptosis and promoted the expression of gene and protein levels of PCNA. The levels of progesterone secretion increased significantly following quercetin treatment, as did the expression levels of StAR and CYP11A1 using the Western Blot (WB) method. 4. The mRNA expression levels of ERα were significantly upregulated in the 100 ng/ml and 1000 ng/ml quercetin-treated groups, while there was no significant difference in expression levels of ERβ mRNA. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Modeling of DSTATCOM Devices to Improve Dynamic Voltage Stability in a Microgrid with High Penetration of Motor Loads.

Author

Paredes, L. A., Serrano, B. R., and Molina, M. G.

Subjects
DYNAMIC stability, MICROGRIDS, INDUCTION machinery, SYNCHRONOUS capacitors, PULSE width modulation, INDUCTION motors, VOLTAGE regulators
Abstract

Copyright of Revista Técnica Energía is the property of Centro Nacional de Control de Energia CENACE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2020
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6. Voltage Stability Improvement with a DSTATCOM in a Microgrid Integrated by DG Solar Photovoltaic and Conventional.

Author

Paredes, L. A., Serrano, B. R., and Molina, M. G.

Subjects
ELECTRIC power, ELECTRIC power systems, ELECTRIC potential, DYNAMIC simulation, TEST systems, ELECTROSTATIC discharges
Abstract

Copyright of Revista Técnica Energía is the property of Centro Nacional de Control de Energia CENACE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2020

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