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We analyse the process of gravitational collapse using Press-Schechter theory in order to predict the existence of Primordial Black Holes, PBHs, using the Josan’s restriction and the latest cosmological parameters measured by Planck satellite. Assuming a gaussian fluctuation on the perturbation in the early Universe, we find that PBHs with mass M > 1012 kg, have not evaporated yet. Comparing with the mass fraction PBH = 10−20 and assuming that the PBHs energy density should not exceed the Cold Dark Matter, CDM, energy density, we constraint the spectral index (blue espectra) to ns < 1.4 and obtain a value of the power spectrum P ≈ 10−2.
2
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Publicado 2012
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In this work the synthesis of magnetite nanoparticles by coprecipitación in inverse microemulsion, which were introduced inside the pores of the polystyrene nanoparticles is reported. The nanoparticles of porous polystyrene were synthesized by heterogeneous polymerization in semicontinuo, which were employed like cover polymeric due to their biocompatibility and biostability. Through the analysis by X-ray diffraction was verified the structure of the magnetite, and estimated its average diameter of 9 nm. The polystyrene nanoparticles loaded with magnetite were prepared in different compositions magnetite/polymer and were determined by the test of magnetization that the magnetic moment (emu/g) is increased when the content of magnetite in the porous of polystyrene nanoparticles is increased.
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Publicado 2012
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En el presente trabajo se reporta la síntesis de nanopartículas de magnetita por coprecipitación en microemulsión inversa, las cuales fueron luego introducidas dentro de los poros de las nanopartículas de poliestireno. Las nanopartículas de poliestireno poroso fueron sintetizadas por polimerización heterogénea en semicontinuo, las cuales se emplearon como cobertura polimérica debido a su biocompatibilidad y bioestabilidad. Mediante el análisis por difracción de rayos-X se pudo comprobar la estructura de la magnetita (unifásica), y estimar su diámetro promedio de 9 nm. Las nanopartículas de poliestireno cargadas con magnetita fueron preparados en diferentes composiciones magnetita/polímero y se determinó mediante pruebas de magnetización que el momento magnético (emu/g) se incrementa al aumentar el contenido de magnetita en las partículas porosas.
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Publicado 2022
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Tuberculosis (TB) is one of the most fatal infectious diseases, caused by the aerobic bacteria Mycobacterium tuberculosis. It is estimated that one-third of the world’s population is infected with the latent (LTB) version of this disease, with only 5-10% of infected individuals developing its active (ATB) form. Pulmonary adenocarcinoma (PA) is the most common and diverse form of primary lung carcinoma. The simultaneous or sequential occurrence of TB and lung cancer in patients has been widely reported and is known to be an issue for diagnosis and surgical treatment. Raising evidence shows that patients cured of TB represent a group at risk for developing PA. In this work, using sRNA-sequencing, we evaluated the expression patterns of circulating small RNAs available in exosomes extracted from blood samples of Peruvian patients affected by latent tuberculosis, active tuberculosis, or pu...
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Publicado 2019
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J.M.-R. was supported by a doctoral scholarship from CONCYTEC-PERU (224–2014-FONDECYT).
