Hasil untuk "astro-ph.SR"

Andronikos Paliathanasis

Abstract We consider a quintessence scalar field with a class of hyperbolic potential. This potential effectively introduces matter-like components into the cosmological fluid, contributing to the dark sector of the universe. For the observational analysis, we employ the PantheonPlus and Union3.0 catalogues, Cosmic Chronometers, and Baryon Acoustic Oscillations from the DESI DR2 collaboration. We test the hypothesis that quintessence can unify the dark sector. Our results reveal that, although the quintessence field provides a minor contribution to the matter component, the data do not show any support for the unification scenario.

Paola Carolina Moreira Delgado

Este artigo de revisão apresenta uma introdução à Cosmologia Quântica, incluindo os métodos matemáticos fundamentais para a abordagem canônica, alguns dos problemas conceituais existentes e a conexão dos modelos com possíveis observáveis.

Vitor Cardoso, Francisco Duque

Em Setembro de 2015, os dois conjuntos de espelhos mais perfeitos do mundo moveram-se simultaneamente e da mesma forma, apesar de separados por milhares de quilômetros. Chegara ao fim uma das mais longas buscas da história da ciência. Pela primeira vez a humanidade capturara na Terra uma onda gravitacional. Esta onda foi produzida por um par de buracos negros muito antes do nascimento de Einstein e até de qualquer ser humano. O mundo da física prepara-se agora para uma nova era, em que a astronomia gravitacional nos vai desvendar os segredos sobre as entidades mais misteriosas de todas: os buracos negros.

D. Baines, D. Whynes

D. G. KING-HELE

Mr Sushanta Kumar Barik Sr, Deepika Varshney, Deepa Bisht Sr et al.

BACKGROUND The focus of the study was the comparative evaluation of HIV-1 infected plasma protein purification and 2-D gel electrophoresis protocols. OBJECTIVE Human plasma protein purification is a risk task to perform 2-D gel electrophoresis. Human plasma proteins contain nearly 70% albumin and globulin. The removal of such high abundance high molecular weight proteins is very difficult to perform 2-D gel electrophoresis METHODS To the best of our knowledge, we searched several research papers, developed and adopted various organic and non-organic based protocols for HIV-1 infected human plasma protein purification and various isoelectrofocusing protocols in 2-D gel electrophoresis RESULTS After failure in 2-D gel-electrophoresis performance by these protocols, Aurum serum mini kit (Bio-Rad, USA) was adopted for plasma protein purification for performing 2-D gel electrophoresis. The low-abundance proteins were better resolved by 10% SDS-PAGE in 2-D gel-electrophoresis. Then, we extended the MALDI-TOF/TOF analysis of low-abundance proteins in human plasma by adopting the Aurum serum mini kit ( Bio-Rad, USA) for 2-D gel electrophoresis. CONCLUSIONS Thus, we concluded that, the Aurum serum mini kit (Bio-Rad, USA) is best to perform the 2-D gel electrophoresis of HIV-1 infected human plasma by depleting the high abundant proteins like albumin and globulin

Katherine Kornei

Chih-Hao Li

Sarah DiGiulio

Bruce G. Haffty

Grace Deming, Beth Hufnagel

Results from a sample of 3800 students taking the Astronomy Diagnostic Test Version 2.0 during 2001 have been used to create a profile of nonscience majors taking introductory astronomy at undergraduate institutions across the United States.

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General Electric Co., Philadelphia, PA (United States). Astro Space Div.

P. Cushman