OBSERVATIONS ON THE SOILS OF THE DEPARTMENT OF PANDO (BOLIVIA) AND THEIR PRODUCTIVE POTENTIAL

OBSERVATIONS ON THE SOILS OF THE DEPARTMENT OF PANDO (BOLIVIA) AND THEIR PRODUCTIVE POTENTIA

K VALUES OF THE SOILS OF PUERTO RICO

K VALUES OF THE SOILS OF PUERTO RIC

CACAO PRODUCTION ON WELL-DRAINED SOILS ALONG THE BANKS OF THE MAMORE RIVER ON NORTHEASTERN BOLIVIA

CACAO PRODUCTION ON WELL-DRAINED SOILS ALONG THE BANKS OF THE MAMORE RIVER ON NORTHEASTERN BOLIVI

EXPLORATORY TESTS ON POSSIBLE INJURIOUS AFTER EFFECTS OF PIGEON PEAS ON SUBSEQUENT CROPS

EXPLORATORY TESTS ON POSSIBLE INJURIOUS AFTER EFFECTS OF PIGEON PEAS ON SUBSEQUENT CROP

K VALVES OF THE SOILS OF THE ACUL WATERSHED IN HAITI

K VALVES OF THE SOILS OF THE ACUL WATERSHED IN HAIT

Analysis of a spatial Lotka-Volterra model with a finite range predator-prey interaction

We perform an analysis of a recent spatial version of the classical Lotka-Volterra model, where a finite scale controls individuals' interaction. We study the behavior of the predator-prey dynamics in physical spaces higher than one, showing how spatial patterns can emerge for some values of the interaction range and of the diffusion parameter.Comment: 7 pages, 7 figure

PREVALENCIA DE Cryptosporidium parvum EN ESCOLARES DE SONORA, MEXICO

La criptosporidiosis es un problema de salud pública, afectando principalmente a personas inmunocomprometidas, niños y ancianos. Esta infección tiene diferentes factores causales y se le ha asociado con altas tasas de morbilidad en la población afectada. Criptosporidiosis es cosmopolita, pero su prevalencia es más alta en sociedades subdesarrollada aunque actualmente la misma se desconoce en México. El objetivo de este estudio fue determinar la prevalencia actual de Cryptosporidium parvum (C. parvum) en una subpoblación de escolares del municipio de Hermosillo, Sonora, México. Se usó ELISA para detectar antígenos fecales de C. parvum. Se invitó a participar a 720 escolares registrados oficialmente en tres primarias públicas. 175 niñas y 145 niños, de edades entre 6 a 13 años participaron voluntariamente durante septiembre a diciembre 2008. De los 320 escolares estudiados, 121 (37,8 %) mostraron infección por C. parvum. No se encontró diferencia en la prevalencia de criptosporidiosis entre sexos (p = 0,15), ni entre áreas suburbana y rural (p = 0,18). Se observó un aumento de la infección con la edad en este estudio. Criptosporidiosis quizá es un serio problema de salud pública en el estado de Sonora y se requieren estudios adicionales que lo confirmen para que las autoridades responsables puedan prevenir y controlar la infección

Exposure to secondhand and thirdhand smoke in private vehicles : Measurements in air and dust samples

This study aimed to estimate airborne nicotine concentrations and nicotine, cotinine, and tobacco-specific nitrosamines (TSNAs) in settled dust from private cars in Spain and the UK. We measured vapor-phase nicotine concentrations in a convenience sample of 45 private cars from Spain (N = 30) and the UK (N = 15) in 2017-2018. We recruited non-smoking drivers (n = 20), smoking drivers who do not smoke inside the car (n = 15), and smoking drivers who smoke inside (n = 10). Nicotine, cotinine, and three TSNAs (NNK, NNN, NNA) were also measured in settled dust in a random subsample (n = 20). We computed medians and interquartile ranges (IQR) of secondhand smoke (SHS) and thirdhand smoke (THS) compounds according to the drivers' profile. 24-h samples yielded median airborne nicotine concentrations below the limit of quantification (LOQ) (IQR: <LOQ - <LOQ) in non-smokers' cars, 0.23 μg/m (IQR:0.18-0.45) in cars of smokers not smoking inside, and 3.53 μg/m, (IQR:1.74-6.38) in cars of smokers smoking inside (p < 0.001). Nicotine concentrations measured only while travelling increased to 21.44 μg/m (IQR:6.60-86.15) in cars of smokers smoking inside. THS concentrations were higher in all cars of smokers, and specially in cars of drivers smoking inside (nicotine: 38.9 μg/g (IQR:19.3-105.7); NNK: 28.5 ng/g (IQR:26.6-70.2); NNN: 23.7 ng/g (IQR:14.3-55.3)), THS concentrations being up to six times those in non-smokers' cars. All cars of smokers had measurable SHS and THS pollution, the exposure levels markedly higher in vehicles of drivers where smoking took place. Our results evidence the need for policies to prohibit smoking in vehicles, but also urge for more comprehensive strategies aiming towards the elimination of tobacco consumption

The state of the Martian climate

60°N was +2.0°C, relative to the 1981–2010 average value (Fig. 5.1). This marks a new high for the record. The average annual surface air temperature (SAT) anomaly for 2016 for land stations north of starting in 1900, and is a significant increase over the previous highest value of +1.2°C, which was observed in 2007, 2011, and 2015. Average global annual temperatures also showed record values in 2015 and 2016. Currently, the Arctic is warming at more than twice the rate of lower latitudes