ABSTRACT
We report on the high-resolution spectroscopic observations of two planetary transits of the hot Jupiter KELT-7b (Mp = 1.28 ± 0.17MJup, Teq = 2028 K) observed with the High Optical ...Resolution Spectrograph (HORuS) mounted on the 10.4-m Gran Telescopio Canarias (GTC). A new set of stellar parameters are obtained for the rapidly rotating parent star from the analysis of the spectra. Using the newly derived stellar mass and radius, and the planetary transit data of the Transiting Exoplanet Survey Satellite (TESS) together with the HORuS velocities and the photometric and spectroscopic data available in the literature, we update and improve the ephemeris of KELT-7b. Our results indicate that KELT-7 has an angle λ = −10.55 ± 0.27 deg between the sky projections of the star’s spin axis and the planet’s orbital axis. By combining this angle and our newly derived stellar rotation period of 1.38 ± 0.05 d, we obtained a 3D obliquity ψ = 12.4 ± 11.7 deg (or 167.6 deg), thus reinforcing that KELT-7 is a well-aligned planetary system. We search for the presence of Hα, Li i, Na i, Mg i, and Ca ii features in the transmission spectrum of KELT-7b but we are only able to determine upper limits of 0.08–1.4 per cent on their presence after accounting for the contribution of the stellar variability to the extracted planetary spectrum. We also discuss the impact of stellar variability on the planetary data. Our results reinforce the importance of monitoring the parent star when performing high-resolution transmission spectroscopy of the planetary atmosphere in the presence of stellar activity.
When a monkeypox virus outbreak began in several parts of the world in May 2022, timely and accurate diagnosis became mandatory. In our laboratory, a real-time quantitative PCR was designed and ...evaluated in several patient samples and compared with isolation results. Genomic viral load was related to virus viability.
Introducción: Durante el proceso de industrialización del mango se generan cerca del 40 % de subproductos (SP, cáscara y pasta). Estos SP contienen carotenoides que benefician a la salud del ...consumidor. Por lo tanto, es un tema de interés conocer si los carotenoides pueden ser bioaccesibles. De tal manera, la extracción asistida por ultrasonido (EAU) ha demostrado ser una herramienta útil para aumentar la bioaccesibilidad de diversos compuestos bioactivos. Se propone elaborar bebidas con SP de mango ‘Ataulfo’ aplicando la EAU y evaluando la bioaccesibilidad de los carotenoides in vitro.Método: Se elaboraron 4 bebidas: una control (BC) y tres utilizando la EAU (B-EAU1: XTE: 30 min, XAS: 30 %, XC: 0.8; B-EAU2: XTE: 15 min, XAS: 70 %, XC: 0.4; B-EAU3: XTE: 12 min, XAS: 100 % y XC: 1). Se determinó el perfil de los carotenoides por HPLC-DAD y la bioaccesibilidad in vitro de los carotenoides. Se evaluó la liberación de los compuestos en la digestión gástrica (DG) e intestinal (DI); así como la retención de éstos en la fracción indigestible soluble (FIS) e insoluble (FII). De esta manera, se determinó el porcentaje de bioaccesibilidad (%BA) de los carotenoides. Se determinó la cinética de liberación durante 180 min,estimando los parámetros cinéticos.Resultados: El contenido de los carotenoides osciló entre 0.01 a 3.29 µg/100 mL en las bebidas de mango. Las xantofilas mostraron diferencia significativa en todas las bebidas con EAU en la DI. La EAU tuvo un efecto negativo sobre el contenido de β-criptoxantina, luteína, y β-caroteno en B-EAU2 y B-EAU3. Por otra parte, el contenido de α-caroteno fue similar en todas las bebidas. En la DI, el contenido de α-caroteno y β-caroteno fueron altos en la BC y los contenidos de luteína y zeaxantina fueron mayores en B-EAU1. El %BA de luteína, zeaxantina, α-caroteno y β-caroteno en la B-EAU1 fue del 95.63, 56.88, 58.68 y 90.54 %, respectivamente. Sin embargo, la β-criptoxantina y zeaxantina fueron los menos bioaccesibles en BC y B-EAU3 con 96.5 y Zea 92.3 %, respectivamente. La B-EAU1 presentó una mayor velocidad de liberación de luteína, β-criptoxantina y β-caroteno.Discusión o Conclusión: La EAU ocasionó una disminución en el contenido de los carotenoides, debido probablemente a reacciones de isomerización. La liberación de xantófilas y carotenos en las bebidas de mango, pudo deberse a factores asociados a los componentes de la matriz del alimento, interacciones de los carotenoides con otros componentes y el tratamiento al que se sometieron las bebidas. Por otro lado, la EAU favoreció la liberación de estos compuestos. La presencia de carotenoides en la FIS y FII se puede atribuir a la fibra dietética de la cáscara y la goma xantan adicionada. La EAU contribuyó al aumento del %BA de los carotenos y xantofilas. También, los parámetros de las cinéticas de liberación mostraron que el EAU facilitó el transporte de los carotenoides. Por lo tanto, los parámetros de la cinetica de liberación muestran que existen factores que influyen este fenómeno como la acción sinérgica o antagónica entre los carotenoides y otros componentes.
We report the discovery of HN Lib b, a sub-Neptunian mass planet orbiting the nearby (
d
≈ = 6.25 pc) M4.0 V star HN Lib detected by our CARMENES radial-velocity (RV) survey. We determined a ...planetary minimum mass of
M
b
sin
i
= 5.46 ± 0.75
M
⊕
and an orbital period of
P
b
= 36.116 ± 0.029 d, using ~5 yr of CARMENES data, as well as archival RVs from HARPS and HIRES spanning more than 13 yr. The flux received by the planet equals half the instellation on Earth, which places it in the middle of the conservative habitable zone (HZ) of its host star. The RV data show evidence for another planet candidate with
M
c
sin
i
= 9.7 ± 1.9
M
⊕
and
P
c
= 113.46 ± 0.20 d. The long-term stability of the signal and the fact that the best model for our data is a two-planet model with an independent activity component stand as strong arguments for establishing a planetary origin. However, we cannot rule out stellar activity due to its proximity to the rotation period of HN Lib, which we measured using CARMENES activity indicators and photometric data from a ground-based multi-site campaign as well as archival data. The discovery adds HN Lib b to the shortlist of super-Earth planets in the habitable zone of M dwarfs, but HN Lib c probably cannot be inhabited because, if confirmed, it would most likely be an icy giant.
This study reports the degree of heavy metal pollution (Cr, Cu, Ni, Pb, Zn and V) in 135 urban topsoil samples from the metropolitan area of Mexico City. Pollution indices (PI) were calculated to ...identify the metal accumulation with respect to the background values. The levels of heavy metals in the analyzed samples show a wide range of variation. Lead, Zn and Cu are the elements most enriched in the analyzed area, presenting pollution indexes of up to 23.8, 21.6 and 12.4, respectively. Geochemical maps were produced to assess the spatial distribution of pollution index. It is concluded that emissions from vehicles may be the major source of Pb urban contamination; furthermore, other small or large factories are possible sources for soil pollution (Cu, Zn). The concentration of Cr, Ni, and V in most of the analyzed samples do not appear to reach pollution levels. The assessment of the soil environmental quality in the metropolitan area Mexico City in terms of PI can be used as the basis for a regular monitoring program for implementing suitable pollution control measures.
•First work of phenolic composition after seaweed application to Tempranillo vineyard.•Ascophyllum nodosum extract foliar application at two dosages in two seasons.•Seaweed treatements improved grape ...stilbenes concentration.•However, its effect on the rest of phenolic compounds content depended on the vintage.
The study of seaweeds is increasing in viticulture due to their implications on plant protection and grape quality. This trial aimed to study the effects of foliar applications of an Ascophyllum nodosum extract at low (0.25%, v v−1) and high (0.50%, v v−1) dosages on grape and wine phenolic compounds in 2017 and 2018. In grapes, seaweed biostimulation increased the content of malvidin-3-glc, myricetin-3-glc and myricetin-3-gal in 2017 season. Moreover, both treatments improved the synthesis of trans-piceid and total stilbenes in both seasons. Sensory analysis revealed that 2017 wines had more color than the 2018 wines, which coincided with color intensity parameters. Therefore, seaweed applications to grapevines improved stilbenes content in grapes independently of the season and its effects on the rest of phenolic compounds in grapes and wines depended strongly of season factor.
Light is an energy source and key environmental factor for plants. Out of the different light wavelengths, blue-light is one of the most relevant spectral regions because of its relation to ...anthocyanins biosynthesis. Among the compounds present in grapes, anthocyanins determine their main organoleptic and healthy properties; while a minimum concentration of ammonium and amino acids is necessary for a desirable development of the alcoholic fermentation. Moreover, amino acids are precursors of several volatile compounds synthetized during the fermentation. The aim of this study was to assess the influence of riboflavin (vitamin B2) applications, at harvest and one week later,to grapevine leaves in combination with post-harvest blue-light irradiation on Tempranillo (Vitis vinifera L.) grape anthocyanins and amino acidscomposition. The combination of blue-light irradiation and two riboflavin doses as well as theseindividual factors affected both grape anthocyanins and amino acidsconcentrations. After one week of storage, anthocyanins concentration diminished when clusters were irradiated with blue-light; while for amino acids content, the trend to increase or decrease is dependent on the riboflavin dose applied in vines and the storage time.
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•The 2 doses of riboflavin (0.5 and 1 mM) applied in vines increased grape amino acid concentration.•At harvest, the content of five anthocyanins was affected by riboflavin application.•Grape anthocyanins content decreased after one week of blue-light irradiation.
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