J. Fuentes

Universidad Juárez Autónoma de Tabasco

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Joaquin Estevez-Delgado

Universidad Michoacana de San Nicolás de Hidalgo

A. M. Watson

Universidad Nacional Autónoma de México

Carlos Espejo

Universidad Nacional Autónoma de México

Gabino Estévez-Delgado

Universidad Michoacana de San Nicolás de Hidalgo

Joel Arturo Rodríguez Ceballos

Universidad Michoacana de San Nicolás de Hidalgo

V. Bringas

Center for Engineering and Industrial Development

Modesto Pineda Duran

Instituto Tecnologico de Orizaba

J. A. López

Tecnológico de Monterrey

Oscar Chapa

Universidad Nacional Autónoma de México

Salvador Cuevas

Universidad Nacional Autónoma de México

Cooperative Institutions

Gemini South Observatory

Universidad Nacional Autónoma de México

Instituto de Astrofísica de Canarias

Australian Astronomical Observatory

Herzberg Institute of Astrophysics

Gemini North Observatory

Consejo Superior de Investigaciones Científicas

NSF’s NOIRLab

Macquarie University

Universidad de La Laguna

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Using Green Fluorescent Protein to Correlate Temperature and Fluorescence Intensity into Bacterial Systems

Journal of Nuclear Physics Material Sciences Radiation and Applications (2016)

K. Beltran J.M. De Jesus-Miranda Judith Alejandra Velázquez Castro L.A. Mandujano-Rosas J. Fuentes

The unique and stunning spectroscopic properties of Green Fluorescent Protein (GFP) from the jellyfish Aequorea victoria, not to mention of its remarkable structural stability, have made it one of the most widely studied and used molecular tool in medicine, biochemistry, and cell biology. Its high fluorescent quantum yield is due to its chromophore, structure responsible of emitting green visible light when excited at 395 nm. Although it is noteworthy that there is enormous available information of the wonderful luminescent properties of GFP, the fact is that there are features and properties unexplored yet, particulary about its capabilities as molecular reporter in several biological processes. In this work, we used recombinant DNA technology to express the protein in bacteria; prepared the bacterial system both in liquid and solid media, and assembled an experimental set to expose those media to a laser beam; thereby we excited the protein chromophore and used emission spectroscopy in order to observe variations in fluorescence when the bacterial system is exposed to different temperatures.

Aequorea victoria

Chromophore

Quantum yield

10.15415/jnp.2016.41005

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FRIDA, the diffraction limited NIR imager and IFS for the GTC

J. A. López José Antonio Lorente Acosta L. Álvarez V. Bringas N. Cardiel

FRIDA (InFRared Imager and Dissector for the Adaptive optics system of GTC) is a near infrared, diffraction limited imager and integral field spectrograph that has been designed and is being built as a collaborative project between GTC partner institutions from Mexico, Spain and the USA. FRIDA will operate with the adaptive optics system of GTC. Three different scales are provided in imaging mode, 0.010, 0.020 and 0.040 arcsec pixel−1. The integral field unit is based on a monolithic image slicer that will slice up the field of view into 30 slices. The IFS spaxels have a 2:1 pixels aspect ratio (2 along the spectral axis an 1 along the spatial axis) and it will offer three different spectral resolutions, R ∼ 1000, 5000 and 30,000, the latter over selectable regions in the H & K bands. Thus FRIDA will exploit the diffraction limit of a 10.4 m telescope with superb image quality and spectral resolutions suitable to tackle a large range of topical astrophysical problems. FRIDA has started systems integration and is scheduled to be ready for fully integrated system tests by the end of 2015 and be delivered to GTC shortly after. Here we present an overview of its design, current status and potential scientific applications.

Integral field spectrograph

Spectral resolution

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A charged perfect fluid solution

Modern Physics Letters A (2020)

Joaquin Estevez-Delgado Jose Vega Cabrera J. Fuentes Joel Arturo Rodríguez Ceballos Modesto Pineda Duran

A static and spherically symmetric stellar model is described by a perfect charged fluid. Its construction is done using the solution of the Einstein–Maxwell equations for which we specify the temporal metric and the electric field which is a monotonic increasing function null in the center. The density, pressure and speed of sound turn out to be regular functions, positive and monotonic decreasing as function of the radial distance. Also, the speed of sound is lower than the speed of light, that is to say, it does not violate the condition of causality. The value of compactness [Formula: see text], so the model is useful to represent neutron stars of quark stars. In a complementary manner, we report the physical values when describing a star of mass [Formula: see text] and radius [Formula: see text], in such case [Formula: see text], and given the presence of the charge, the interval for the central density [Formula: see text].

Perfect fluid

Speed of Sound

Star (game theory)

10.1142/s0217732320501205

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INTEGRAL: an Optical-Fiber System for 2-D Spectroscopy on the 4.2-in William Herschel Telescope

S. Arribas C. del Burgo D. Carter L. Cavaller Ryan Edwards

William Herschel Telescope

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Singular Lagrangians and the Faddeev-Jackiw Formalism in Classical Mechanics

International Journal of Theoretical Physics (2024)

J. Fuentes Carlos Manuel López Arellano Jaime Manuel Cabrera

Formalism (music)

10.1007/s10773-024-05626-7

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Dipolar distribution generated by laser-induced plasma (LIP) in air in earliest instants

Journal of Physics D Applied Physics (2013)

J. Fuentes C. Sánchez-Aké F. Bredice M. Villagrán-Munı́z

We present an experimental investigation of the electric field potential and magnetic field generated by a laser-induced plasma in air, for time delays 0 ≤ t ≤ 50 ns. The laser used is a Nd : YAG, λ = 1064 nm, 10 ns at FWHM, and the irradiance applied is I = (1011–1012) W cm−2. We find that the collective effect of the charges in the plasma form a dynamic dipole distribution aligned with the laser beam axis. This experimental result is explained based on the mobility of the electric charges detected by mapping near the plasma with a coaxial cable probe. Shadowgraphy and fast photography techniques show that the plasma ionization front advances asymmetrically and mostly toward the lens. The intrinsic dipole moment is estimated by applying an external electric field. The magnetic diagnostic shows the presence of a current aligned with the laser beam that gives rise to an azimuthal magnetic field, corroborating the observed dipolar configuration.

10.1088/0022-3727/46/49/495202

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Relativistic charged stellar modeling with a perfect fluid sphere

Communications in Theoretical Physics (2023)

Joaquin Estevez-Delgado Joel Arturo Rodríguez Ceballos J. Fuentes Jaysa B. Cabrera -Antonio Rendón Romero

Abstract In this report we present the generalization of a solution to Einstein’s equations with perfect fluid for the case of Einstein–Maxwell with perfect fluid. The effect of the charge is reflected by a parameter, ν , and its interval is determined by the positivity condition from the pressure in the interior of the star. It is shown that the solution is stable according to the Zeldovich criteria as well as in relation to the criteria of the adiabatic index. The compactness, u = GM / c 2 R , of this charged model is greater than it is for the chargeless case as a result of the effect of the presence of the charge. This allows it to represent stars with a high compactness, in particular a graphic analysis is presented for the star SAX J1808.4-3658 with mass M = 1.435 M ⊙ and radius R = 7.07 km. From these data and employing the solution, we obtain that the total maximum charge for the star is Q = 2.4085 × 10 20 C.

Star (game theory)

Perfect fluid

10.1088/1572-9494/ace95a

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A stellar model in Rastall gravity with perfect fluid

International Journal of Modern Physics A (2024)

J. Fuentes Joaquin Estevez-Delgado Jose Vega Cabrera Joel Arturo Rodríguez Ceballos Rafael Soto-Espitia

Perfect fluid

10.1142/s0217751x24501318

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