seasonal periods

  This study evaluated genotoxic and cytotoxic potential of water samples through the analysis of Allium cepa root cells exposed to samples from five urban lakes of Alta Floresta, state of Mato Grosso. The samples were obtained in the dry and rainy periods, October 2014 and April 2015, respectively, at five distinct points. The collection points were as follows: Lake 01, located in MT 206; Lake 02, in Avenida Perimetral Rogério Silva; Lake 03, in Sector C; Lake 04 on Teles Pires Avenue; and Lake 05, in the Cidade Bela District. Bioassays using Allium cepa bulbs were taken from the water at each point, and comparisons were made with the negative and positive controls. The results found the presence of genotoxic and cytotoxic activities on the roots of A. cepa, indicating high potential in cell cycle inhibition. This result may also be caused by the influences of seasonal periods, taking into account that in the rainy season there is a greater transport of cytotoxic substances by rain...

Atmospheric particulate matter (PM) refers fine solid and liquid particles suspended in air, strongly dependent of anthropogenic air emissions in urban areas. High PM levels have been measured in several cities around the world. Several important industrial facilities exist in the urban area of A Coruña, NW of Spain. They emit important PM to the air. A network of air quality monitoring stations exists and it allowed knowing the hourly PM 10 concentration in the air. PM 10 is used to denote particles of diameter under 10 µm. Such data is used to know the seasonal and yearly content on PM 10 in the air between 2005 and 2008 in the urban area. The data provided shows small variability in the air PM 10 concentration among stations and seasonal periods. Slightly higher PM 10 concentrations and variability can be observed during spring and summer due to climatic factors, above all in rural and industrial settings located in the outskirts of the city.

Atmospheric particulate matter (PM) refers fine solid and liquid particles suspended in air, strongly dependent of anthropogenic air emissions in urban areas. High PM levels have been measured in several cities around the world. Several important industrial facilities exist in the urban area of A Coruña, NW of Spain. They emit important PM to the air. A network of air quality monitoring stations exists and it allowed knowing the hourly PM 10 concentration in the air. PM 10 is used to denote particles of diameter under 10 µm. Such data is used to know the seasonal and yearly content on PM 10 in the air between 2005 and 2008 in the urban area. The data provided shows small variability in the air PM 10 concentration among stations and seasonal periods. Slightly higher PM 10 concentrations and variability can be observed during spring and summer due to climatic factors, above all in rural and industrial settings located in the outskirts of the city.

Sky condition evaluation in northeast geopolitical zone of Nigeria has been carried out in this paper. Twenty years (2000-2020) data of daily global solar radiation and monthly average bright sunshine hours are sourced from National Aeronautics and Space Administration (NASA) and Nigeria Meteorological Agency (NIMET), respectively. The zone consists of six states. Total average global solar radiation on horizontal surface of 69.05 kWhrm-2 day-1 is estimated for the zone. Monthly average clearness index ranges from 0.42-0.69. These depict that cloudy sky condition is prevalent in northeast of Nigeria. A monthly bright sunshine hour of the geopolitical zone is estimated at 94.16 hrs. Five (5) seasonal classification periods are recorded in Bauchi, Damaturu and Yola. In Gombe and Maidugri, six seasonal classification periods were observed. While in Jalingo, seven seasonal periods were identified. Coefficients of determination are estimated for Angstrom-Page equation for the study locations and zone.

In this study, models for estimating direct normal irradiance (Hb) under various sky conditions in data sparse tropical ecological zones in Nigeria were fitted. The evaluated values of clearness index indicate that the prevailing sky condition in the southern tropical zones is heavily overcast while the northern zones experience partly overcast under all sky conditions. From the analyses of the influences of clearness index on Hb, it was observed that higher values of Hb were recorded in the far north zone of Sahel savannah (FNZSS) of Sokoto while lower values were registered in the far south zone of mangrove swamp of Port Harcourt revealing an increasing trend from FSZMS to FNZSS due to the trends in cloudiness and associated atmospheric moisture with the movement through the Hadley cell calculation system along the equatorial line. The regression correlation models developed from the model performance test indicates that the proposed models could be used to estimate Hb accurately between latitude 4 to 10 o N, that is, mangroves swamp and Guinea savannah tropical zones in Nigeria and other locations with comparable sky conditions.

Os recursos hídricos são altamente contaminados por efluentes urbanos, industriais e agrícolas, consequência do desenvolvimento industrial e crescimento desordenado da população humana. Por essa razão, este trabalho objetivou avaliar o potencial citotóxico das águas dos Ribeirões Varginha e Tabatinga, localizados, respectivamente, na área urbana dos municípios de Califórnia e Mandaguari, região norte central do Estado do Paraná, que recebem efluentes industriais e urbanos pelo seu curso. Para tanto, utilizou-se de uma pesquisa de abordagem qualitativa e de caráter exploratório. Foram utilizadas como sistema-teste as células meristemáticas de raiz de Allium cepa L. As raízes de cebola foram preparadas pela reação de Feulgen e coradas com o reativo de Schiff. Os resultados obtidos mostraram que não houve alterações, estatisticamente significativas, pelo teste do qui-quadrado, nos índices de divisão celular nas células de Allium cepa L., tratadas com as águas dos ribeirões, em relação aos dados obtidos para os controles. Entretanto, considerando que alguns parâmetros físicoquímicos estavam acima dos limites permitidos pela legislação vigente é importante que seja realizado um monitoramento ambiental nas regiões dos ribeirões, no sentido de analisar a citotoxicidade das águas desses, em diferentes épocas do ano, buscando manter a qualidade da água e, consequentemente, de todo o ecossistema.

  This study evaluated genotoxic and cytotoxic potential of water samples through the analysis of Allium cepa root cells exposed to samples from five urban lakes of Alta Floresta, state of Mato Grosso. The samples were obtained in the dry and rainy periods, October 2014 and April 2015, respectively, at five distinct points. The collection points were as follows: Lake 01, located in MT 206; Lake 02, in Avenida Perimetral Rogério Silva; Lake 03, in Sector C; Lake 04 on Teles Pires Avenue; and Lake 05, in the Cidade Bela District. Bioassays using Allium cepa bulbs were taken from the water at each point, and comparisons were made with the negative and positive controls. The results found the presence of genotoxic and cytotoxic activities on the roots of A. cepa, indicating high potential in cell cycle inhibition. This result may also be caused by the influences of seasonal periods, taking into account that in the rainy season there is a greater transport of cytotoxic substances by rain...

This study evaluated genotoxic and cytotoxic potential of water samples through the analysis of Allium cepa root cells exposed to samples from five urban lakes of Alta Floresta, state of Mato Grosso. The samples were obtained in the dry and rainy periods, October 2014 and April 2015, respectively, at five distinct points. The collection points were as follows: Lake 01, located in MT 206; Lake 02, in Avenida Perimetral Rogério Silva; Lake 03, in Sector C; Lake 04 on Teles Pires Avenue; and Lake 05, in the Cidade Bela District. Bioassays using Allium cepa bulbs were taken from the water at each point, and comparisons were made with the negative and positive controls. The results found the presence of genotoxic and cytotoxic activities on the roots of A. cepa, indicating high potential in cell cycle inhibition. This result may also be caused by the influences of seasonal periods, taking into account that in the rainy season there is a greater transport of cytotoxic substances by rainwater, and in the dry season, a higher concentration of pollutants due to the reduction of water volume, resulting in a greater interaction of the concentrators as well as a greater concentration of the elements found in the water of these lagoons.