481 research outputs found
Codariocalyx Gyroides- A New Forage Option for the Humid Tropics
The Southeast Asian shrub legume, Codariocalyx gyroides is adapted to acid, low-fertility soils with poor drainage. Data from 19 RIEPT (International Network for Evaluation of Tropical Pastures) trial sites conducted in the American humid and subhumid tropics were used to define the range of adaptation of C. gyroides. The results show that C. gyroides performs better under high rainfall conditions of the humid tropics with hardly any dry season, and it responds to soil fertility (Ca, P). Future research needs are identified. The release of a commercial cultivar in Colombia is being prepared
A New Kind of Quinonic-Antibiotic Useful Against Multidrug-Resistant S. aureus and E. faecium Infections
Indexación: Scopus.A rapid emergence of resistant bacteria is occurring worldwide, endangering the efficacy of antibiotics and reducing the therapeutic arsenal available for treatment of infectious diseases. In the present study, we developed a new class of compounds with antibacterial activity obtained by a simple, two step synthesis and screened the products for in vitro antibacterial activity against ATCC® strains using the broth microdilution method. The compounds exhibited minimum inhibitory concentrations (MIC) of 1⁻32 μg/mL against Gram-positive ATCC® strains. The structure⁻activity relationship indicated that the thiophenol ring is essential for antibacterial activity and the substituents on the thiophenol ring module, for antibacterial activity. The most promising compounds detected by screening were tested against methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus faecium (VREF) clinical isolates. We found remarkable activity against VREF for compounds 7 and 16, were the MIC50/90 were 2/4 µg/mL and 4/4 µg/mL, respectively, while for vancomycin the MIC50/90 was 256/512 µg/mL. Neither compound affected cell viability in any of the mammalian cell lines at any of the concentrations tested. These in vitro data show that compounds 7 and 16 have an interesting potential to be developed as new antibacterial drugs against infections caused by VREF.https://www.mdpi.com/1420-3049/23/7/177
Analyzing the turbulent planetary boundary layer by remote sensing systems: the Doppler wind lidar, aerosol elastic lidar and microwave radiometer
he planetary boundary layer (PBL) is the lowermost
region of troposphere and is endowed with turbulent
characteristics, which can have mechanical and/or thermodynamic
origins. This behavior gives this layer great importance,
mainly in studies about pollutant dispersion and
weather forecasting. However, the instruments usually applied
in studies of turbulence in the PBL have limitations
in spatial resolution (anemometer towers) or temporal resolution
(instrumentation aboard an aircraft). Ground-based
remote sensing, both active and passive, offers an alternative
for studying the PBL. In this study we show the capabilities
of combining different remote sensing systems (microwave
radiometer – MWR, Doppler lidar – DL – and elastic lidar
– EL) for retrieving a detailed picture on the PBL turbulent
features. The statistical moments of the high frequency distributions
of the vertical wind velocity, derived from DL,
and of the backscattered coefficient, derived from EL, are
corrected by two methodologies, namely first lag correction
and -2=3 law correction. The corrected profiles, obtained
from DL data, present small differences when compared with
the uncorrected profiles, showing the low influence of noise
and the viability of the proposed methodology. Concerning
EL, in addition to analyzing the influence of noise, we explore
the use of different wavelengths that usually include
EL systems operated in extended networks, like the European
Aerosol Research Lidar Network (EARLINET),This work was supported by the Andalusia
Regional Government through project P12-RNM-2409 and by the
Spanish Agencia Estatal de Investigación (AEI) through projects
CGL2016-81092-R and CGL2017-90884-REDT. We acknowledge
the financial support by the European Union’s Horizon 2020
research and innovation program through project ACTRIS-2 (grant
agreement no. 654109)
Economic impact to shipping industry : Economic impact to shipping industry considering Maritime Spatial Planning and green routes in pilot case studies
In this project, three case studies are considered in order to examine the economic impact of the implementation of MSP when considering environmental impact of the shipping industry. Specific characteristics and limitations of areas in the Greek Sea, the Balearic Sea and the Baltic Sea are evaluated with respect to their economic effects on the maritime transport domain.
The purpose of the above is to evaluate the economic impacts and risk implications of different scenarios and particularly:
The economic impact of vessel traffic rerouting and/or reducing the speed in order to reduce the probability of vessel strikes or other negative impact to endangered marine species.
Analysis and treatment of costs (constraints and penalties) from unexpected delays, in addition to the additional transit time cost.
Estimation of the direct and indirect economic impact on the shipping industry and the effects of potential port call dislocation for the implementation of the proposed management options (e.g. speed deceleration or ship rerouting).https://commons.wmu.se/monalisa2/1001/thumbnail.jp
Study of the planetary boundary layer by microwave radiometer, elastic lidar and Doppler lidar estimations in Southern Iberian Peninsula
The Planetary Boundary Layer (PBL) is a relevant part of the atmosphere with a variable extension that clearly plays an important role in fields like air quality or weather forecasting. Passive and active remote sensing systems have been widely applied to analyze PBL characteristics. The combination of different remote sensing techniques allows obtaining a complete picture on the PBL dynamic. In this study, we analyze the PBL using microwave radiometer, elastic lidar and Doppler lidar data. We use co-located data simultaneously gathered in the framework of SLOPE-I (Sierra Nevada Lidar aerOsol Profiling Experiment) campaign at Granada (Spain) during a 90- day period in summer 2016. Firstly, the PBL height (PBLH) obtained from microwave radiometer data is validated against PBLH provided by analyzing co-located radiosondes, showing a good agreement. In a second stage, active remote sensing systems are used for deriving the PBLH. Thus, an extended Kalman filter method is applied to data obtained by the elastic lidar while the vertical wind speed variance method is applied to the Doppler lidar. PBLH's derived by these approaches are compared to PBLH retrieved by the microwave radiometer. The results show a good agreement among these retrievals based on active remote sensing in most of the cases, although some discrepancies appear in instances of intense PBL changes (either growth and/or decrease)
Diseño y optimización de una mezcla de compota, elaborada a partir de pulpa de guayaba, chalarina y oca
Este estudio tuvo como objetivo diseñar y optimizar una mezcla de compota, elaborada a partir de pulpa de guayaba, chalarina y oca. Para ello, se utilizaron frutas de guayaba, chalarina y tubérculos de oca recién cosechados, a los que se extrajeron las pulpas sin presencia de cáscara, pepas y materias extrañas. Seguidamente, las pulpas fueron escaldadas a 90 °C por 5 min y fueron mezcladas en proporciones de 0-100 %, de acuerdo al Diseño de Mezclas Simplex Centroide. La optimización se realizó teniendo en cuenta las variables de respuesta aceptabilidad y diferencial de color (ΔE). Las mezclas elaboradas con altos porcentajes de pulpa de guayaba y chalarina y bajos porcentajes de pulpa de oca mostraron una mayor aceptabilidad. La mezcla con un 66,66 % de pulpa de guayaba, 16,66 % de pulpa de chalarina y 16,66% de pulpa de oca presentó la mayor aceptabilidad de los panelistas. Las mezclas con altos porcentaje de pulpa de guayaba y chalarina y con proporciones iguales de las pulpas de guayaba, chalarina y oca (33,33 %/ 33,33 %/ 33,33 %) presentaron altos valores de ΔE. Los modelos cuadráticos para la aceptabilidad y ΔE exhibieron un mejor ajuste de los datos (R2 ajustado > 0,70), en comparación con los modelos lineales. La mezcla de pulpas óptimas fue la elaborada con 75 % de pulpa de guayaba y 25 % de pulpa de oca. Esto indica que las mezclas elaboradas con pulpa de guayaba y oca fueron las más aceptadas por los panelistas y presentaron el mayor ΔE
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