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Статті в журналах з теми "Particulate matte"
Benenati, Emma P., Joseph P. Shannon, Jessica S. Hagan, and Dean W. Blinn. "Drifting Fine Particulate Organic Matte below Glen Canyon Dam in the Colorado River, Arizona." Journal of Freshwater Ecology 16, no. 2 (June 2001): 235–48. http://dx.doi.org/10.1080/02705060.2001.9663808.
Повний текст джерелаLoss, Arcângelo, Marcos Gervasio Pereira, Sidinei Julio Beutler, Adriano Perin, Marisa de Cassia Piccolo, Shirlei Almeida Assunção, and Everaldo Zonta. "THE IMPACT OF AGRICULTURAL SYSTEMS IN THE SOIL ORGANIC MATTER CONTENT IN BRAZILIAN CERRADO." International Journal of Research -GRANTHAALAYAH 7, no. 8 (August 31, 2019): 220–44. http://dx.doi.org/10.29121/granthaalayah.v7.i8.2019.662.
Повний текст джерелаSzáková, J., J. Sysalová, and P. Tlustoš. "Particular aspects of environmental impact of potentially risk elements from airborne particulate matter." Plant, Soil and Environment 51, No. 8 (November 19, 2011): 376–83. http://dx.doi.org/10.17221/3613-pse.
Повний текст джерелаDanciulescu, Valeriu, Luoana Florentina Pascu, Mihaela Petrescu, Andreea Cozea, Raluca Diodiu, Gheorghita Tanase, and Maria Pasca. "The influence of emission sources on particulate matter pollution in adjacent areas." SIMI 2019, SIMI 2019 (September 20, 2019): 253–58. http://dx.doi.org/10.21698/simi.2019.fp33.
Повний текст джерелаGrimm, Christian, Agnès Feurtet-Mazel, Oleg S. Pokrovsky, and Eric H. Oelkers. "Riverine Particulate Matter Enhances the Growth and Viability of the Marine Diatom Thalassiosira weissflogii." Minerals 13, no. 2 (January 26, 2023): 183. http://dx.doi.org/10.3390/min13020183.
Повний текст джерелаFang, Guor-Cheng, Yuh-Shen Wu, Wen-Jhy Lee, Te-Yen Chou, and I.-Chen Lin. "Seasonal variation in concentration and metallic constituents of atmospheric particulates near the western coast of central Taiwan." Toxicology and Industrial Health 22, no. 5 (June 2006): 193–201. http://dx.doi.org/10.1191/0748233706th262oa.
Повний текст джерелаIda, Munfarida, Sofyan Asep, and Rezagama Arya. "Effect of Organic Particulate Matter on Vegetable Crops and their Control Potentials." E3S Web of Conferences 73 (2018): 05021. http://dx.doi.org/10.1051/e3sconf/20187305021.
Повний текст джерелаMin, Seonghee, and Yoosoo Oh. "A Study of Particulate Matter Area Division Using PM10 Data Clustering: Focusing on the Case of Korean Particulate Matter Observatory." Journal of Advanced Research in Dynamical and Control Systems 11, no. 12-SPECIAL ISSUE (December 31, 2019): 959–65. http://dx.doi.org/10.5373/jardcs/v11sp12/20193300.
Повний текст джерелаYu, Yun Jiang, Qiong Wang, Zhong Ren Nan, Yan Ping Zhang, Hai Peng Lin, and Sheng Li Wang. "Distribution Characteristics and Health Risk Assessment of Heavy Metal Pollutants on Air Particulate Matters in Lanzhou City." Advanced Materials Research 518-523 (May 2012): 961–69. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.961.
Повний текст джерелаKuldeep, Kuldeep, Sohil Sisodiya, and Anil Mathur. "Environmental Risk Assessment Ascribed to Particulate Matter for Kota City, Rajasthan (India)." ECS Transactions 107, no. 1 (April 24, 2022): 543–59. http://dx.doi.org/10.1149/10701.0543ecst.
Повний текст джерелаДисертації з теми "Particulate matte"
Gomes, Nogueira Ana Paula. "Particulate Matter Emission Issues in Brake Systems." Doctoral thesis, Università degli studi di Trento, 2022. http://hdl.handle.net/11572/348039.
Повний текст джерелаCosta, Talitha Lopes Ferreira da. "Origem e composição da matéria orgânica particulada no complexo estuarino-lagunar de Mundaú-Manguaba utilizando lipídios como marcadores moleculares." Universidade do Estado do Rio de Janeiro, 2010. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1626.
Повний текст джерелаO Complexo Estuarino Lagunar Mundaú-Manguaba está sofrendo um processo acelerado de degradação ambiental devido a muitas atividades antrópicas como crescimento urbano desordenado, processamento de cana-de-açúcar, pecuária, efluentes industriais e domésticos. O objetivo deste trabalho é avaliar a composição e distribuição do material particulado em suspensão através de traçadores geoquímicos orgânicos para identificar as fontes potenciais e os padrões de mistura da matéria orgânica no CELMM durante duas campanhas: uma realizada no período seco e a outra no período úmido. As amostras de água foram coletadas na superfície (< 1 m de profundidade), utilizando garrafas de vidro de 4L de capacidade. Os n-alcoois, esteróis e ácidos graxos foram extraídos por Soxhlet e analisados por cromatografia em fase gasosa acoplada a espectrometria de massas. Considerando os resultados obtidos, constatou-se que há uma predominância de matéria orgânica autóctona em ambos os períodos de amostragem no sistema em questão. Contudo, também foi observada a presença de fontes alóctonas e antrópicas, tendo estas uma menor influência durante o período seco.
The Mundaú-Manguaba estuarine lagoon system is located in Maceió, Alagoas, Brazil. This region has been suffering an accelerated process of environmental degradation through many antropic activities like urban growth, sugar-cane processing, cattle breeding, industrials waste and sewage. The aim of this work is to evaluate the suspended particulate matter composition and distribution with organic geochemistry markers to identify the potential sources and mixing processes in the system during the wet and the dry period. The water samples were collected at the surface (<1m of depth), using a 4L glass bottle. Lipids were extracted by Soxhlet and quantified by gas chromatography-mass spectrometry. Considering the obtained results, a predominance of autochthonous sources of organic matter was established for the system. However, the presence of alochthonous and anthropic also was observed with lower influence during the dry period.
Gómez, Ana Maria Mosquera. "Modelagem da dispersão de material particulado na atmosfera a partir de fontes estacionárias utilizando fluidodinâmica computacional." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-24102017-151559/.
Повний текст джерелаIn this study an analysis of the dispersion of particulate matter generated by stationary sources is proposed, by applying Computational Fluid Dynamics (CFD) tools, using an Eulerian model for the flow and a Lagrangean model for the particles, under steady-state conditions in the Fluent software. The model validation is presented in two sessions, the first comprises the study of the atmospheric flow under conditions of neutral stability, including the effects of the heterogeneities of the terrain. In this case, the air flow past a 126m high hill in real scale was adopted. Different turbulence models were compared: standard k-?, k-? RNG and parametrized k-?. The three models presented similar performance and described satisfactorily the trends of the experimental data. Subsequently, the Lagrangean model based on the Eddy life time (DRW - Discrete Random Walk) was used to represent the distribution of particulate matter concentrations in a confined environment. The numerical results satisfactorily describe the particle concentration profiles, but underestimate the values in the region near the wall, which would indicate that a better approximation of the particle deposition should be considered. After these studies, this Eulerian- Lagrangean approach was applied to the case of dispersion of particulate material under neutral atmosphere conditions in a region around the city of Santa Gertrudes-SP, where the Ceramic Complex is responsible for the largest production of ceramic tiles in Brazil. Transit of trucks on unpaved roads has been identified as a source of particulate matter that reaches the urban perimeter of the city. The contributions of the activities related to mining and the preparation of the soil for agricultural use were also studied, although this last one does not add a significant load when compared with the two previous ones. In addition to the influence of the mentioned sources, industrial sources located inside the city also contribute to the scenario.
Faccio, Andréa Tedesco. "Abordagem metabolômica no estudo da exposição gestacional à poluição atmosférica." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-07122015-101244/.
Повний текст джерелаThere are strong evidences regarding negative effects of gestational exposure to air pollution. However, the mechanisms of action of air pollutants are not well established. Maternal anomalous physiological changes during pregnancy may cause permanent changes in offsprings, that might initiate future diseases in adult life. Therefore, the study of those maternal changes during pregnancy is important. Metabolomics is defined as the global analysis of the metabolome of an organism in comparative studies, for the measurement of relative changes in the metabolite abundance, appearance or disappearance. Metabolomics might provide a better understanding of cellular functioning at the molecular level. In this work, an experimental study of maternal gestational exposure to fine particulate matter (PM2.5) was accomplished to evaluate the effects of this exposure to the metabolism, by an untargeted metabolomics analysis of urine from pregnant mice exposed to PM2.5 or to filtered air during pregnancy. A chromatographic and sample preparation methods for urinary untargeted metabolomics analysis by HILIC-MS were optimized. For the chromatography optimization, the influence of mobile phase additives, salt concentration and pH, as well as, the gradient ramp were investigated. The best condition was chosen by the evaluation of peak shape, relative intensity and retention time CV of 15 selected m/z, as well as, the total number of molecular features and the intensity CV of those molecular features. The best condition comprises of 20 mmol/L of ammonium formate as solvent B, and 95% acetonitrile and 5% 400 mmol/L of ammonium formate as solvent A, in the composition of the mobile phase. For the sample preparation, different solvents, along with, their mixtures were examined for the urine protein precipitation. Isopropanol was the solvent that presented the best results for sample preparation. Thus, after the analytical method optimized, urine samples from the progenitors were submitted to untargeted metabolomics analysis by HILIC-MS. The animals\' metabolome were significantly changed by the gestational exposure to particulate matter. It was observed changes in the levels of carnitines, amino acids, peptides, among others. There is some indication that the air pollution has altered the gut microbiota, due to the enhancement of trimethylamine N-oxide (TMAO), a metabolite that is also related to the atherosclerosis process. The level of metabolites related to histidine metabolism were also altered due to PM2.5 exposure. Carnitine and acylcarnitine levels were also increased in the test group, suggesting an altered energy production in the mitochondria.
Souza, Milena Gouveia Oliveira de. "Avaliação da concentração de arsênio em partículas fracionadas por tamanho na atmosfera do Recôncavo Baiano." reponame:Repositório Institucional da UFBA, 2011. http://www.repositorio.ufba.br/ri/handle/ri/10027.
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Atualmente, um dos maiores problemas mundiais é a poluição atmosférica, oriunda essencialmente de fontes antrópicas. Os grandes impactos ambientais, como a degradação da qualidade do ar, são resultados dos processos de desenvolvimento urbano e industrial. O material particulado (MP) tem sido alvo de vários estudos devido aos efeitos nocivos causados ao meio ambiente e a saúde humana. O arsênio, um metalóide que apresenta características tanto de metal como de não-metal, é considerado altamente tóxico. A associação do arsênio ao material particulado pode provocar sérios danos à saúde da população. Os níveis de toxicidade do arsênio são dependentes de sua forma química. As espécies inorgânicas de arsênio, arsenito (AsIII) e arseniato (AsV), são também consideradas agentes carcinogênicos. O Recôncavo Baiano é uma região que apresenta grande importância ambiental, social e econômica para o estado da Bahia. Nesta área encontram-se portos, terminais marítimos e diversos pólos industriais que são as principais fontes de emissão de poluentes para o meio ambiente. O presente trabalho teve por objetivo verificar a concentração do arsênio presentes tanto nas partículas finas, quanto nas partículas grossas do material particulado atmosférico do Recôncavo Baiano, para avaliar as contribuições deste poluente à saúde da população exposta. A determinação de arsênio em material particulado, utilizando a digestão, com HNO3, e a técnica de espectrometria de fluorescência atômica acoplada à geração de hidreto (HG-AFS), mostrou-se eficiente para a matriz estudada com limite de detecção e quantificação de 0,3 ng m-3 e 1 ng m-3, respectivamente. As concentrações médias de arsênio, obtidas no material particulado em algumas regiões do Recôncavo Baiano, estavam em torno de 30 ng m-3, valor cinco vezes maior que o recomendado pela União Européia (6 ng m-3). O arsênio presente no material particulado encontra-se substancialmente nas partículas finas. Alertando para os riscos de exposição da população, nos municípios onde foram feitas as amostragens. Os resultados apresentados neste trabalho são indicativos da necessidade de se atualizar os padrões de qualidade do ar para o Brasil, incluindo outros poluentes como o arsênio
Salvador
Golly, Benjamin. "Etude des sources et de la dynamique atmosphérique de polluants organiques particulaires en vallées alpines : apport de nouveaux traceurs organiques aux modèles récepteurs." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENA019/document.
Повний текст джерелаRecently, Air quality has become a sensitive topic for Rhône-Alpes region due to the formal notice which was addressed by the European Commission for non-compliance with legislation in force. Indeed, certain geographic areas in the region present a lot of overruns in PM10, especially in Alpine valleys during winter. These overruns particles are also accompanied by high concentrations of organic compounds such as polycyclic aromatic hydrocarbons (PAHs), which constitute these PMs. An increase in khowledge about the sources of particulate air pollution and their dynamics in Alpine valleys is necessary, in order to improve the implementation of policies to reduce emissions through better knowledge of the influence of different sources at regional level. This thesis is focused around emissions from industrial sources still poorly known and particularly of the carbon industry highly present in these industrial areas of the valley bottoms. Traditional approaches by metallic elements being not specific, exploration of the organic fraction allowed to propose a complete organic chemical profile. In addition they led us to evidence the benzo(b)naphtho(2,1-d)thiophene (BNT(2,1)), the most abundant particulate compound of the family of sulfur-containing polycyclic aromatic hydrocarbons (PASHs), as a tracer of this source. This compound was detected and quantified on multiple sites in near industrial activities confirming its potential source. In addition the industrial profile was introduced as profile “source” in order to assess its robustness in methodologies of receptor model like the “Chemical Mass Balance “(CMB) and the “Positive Matrix Factorization” (PMF). The results confirmed the interest of the addition of organic compounds to these methodologies. Thus, the industrial profile and the PASHs compounds have allowed to better trace the source usually called “carbon industry” (coal, coke and graphite materials combustions) in the Alpine valleys but also in different French urban sites. In parallel, a non linear regression model (NLRM) was developed to PAH source apportionment, based on the use of specific molecular markers (levoglucosan, hopanes…) and of meteorological data (altitudinal temperature lapse rate). Its implementation has been validated on a set of sites of the Alpine valleys of Arve and Tarentaise. Coupling between this model and the optical measurements of black carbon (BC) by aethalometer, allowed to propose a solution to the poor performance of correlation between PAHs measured and modeled by NLRM model on this site of the Maurienne valley. These low correlations may be related to poor representativeness of organic compounds used to correctly trace the emission sources at some sites. Finally, the inter-comparison of these methodologies for the determination of PAH sources and especially of industrial source allows to validate this methodology in an operational perspective of monitoring of PAH levels on these sites. The work performed during this thesis highlights the interest of the characterizatin of the organic fraction of PM and the biases that may exist on the use of organic compounds for the study of the emission sources. Some alternatives are suggested to clarify ambiguities and improve the source apportionment of PAHs by receptor models
Válio, Vinícius Mori. "Análise do material particulado atmosférico em uma região de São Carlos-SP." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-13082015-144101/.
Повний текст джерелаThis study evaluated the air quality of a central area of the city São Carlos-SP, more precisely on the Campus 1 of the University of São Paulo. In this region there is a large movement of people and vehicles, manly during business hours. This evaluation was made based on determination of one parameter used to verify air quality, the inhalable particulate material (PM) suspended in the air, in other words, particles which have aerodynamic diameter less or equal to 10 μm and can penetrate in the respiratory system, therefore, harmful to human health. The PM was determined in its fractions from 2,5 and 10 μm of diameter (PM10 e PM2,5).). Two different methodologies were used to determinate the concentration of particulate suspended material, photometry by scattered light, using the equipment ADR-1500, and gravimetry, thru PEM (Personal Environmental Monitor). The data obtained from gravimetry were higher than the results found thru photometry. The concentrations found were compared to the limits recommended by World Health Organization for PM and its fractions of 2,5 and 10 μm, equal to 25 and 50 μg/m3. Besides PM, temperature, relative humidity and precipitation were measured. The average values for the concentrations of PM10 and PM2,5 , using gravimetry, which provide more reliable results, it were equal to 48,8 and 23,1 μg/m3, therefore really close to their corresponding limits. The lower concentrations seen for PM10 were, mostly, verified on rainy days, using PEM and ADR. The concentrations of PM2,5 , obtained just using PEM, also had the lowest values during rainy days. A mathematical model was developed to predict PM10 behavior during precipitations, this event has shown to have the most important influence on the concentration of atmospheric particulate matter.
Sánchez, Soberón Francisco. "Assessment of the human health risks and toxicity associated to particles (PM10, PM2.5 and PM1), organic pollutants and metals around cement plants." Doctoral thesis, Universitat Rovira i Virgili, 2018. http://hdl.handle.net/10803/525816.
Повний текст джерелаLas partículas en suspensión (PM) son el contaminante aéreo más peligroso para la salud humana. Éstas se componen de partículas sólidas y líquidas que flotan en el aire y que tienen tamaño y composición química diversa. Las PM suelen clasificarse según su tamaño. Así, aquellas que presentan un diámetro menor de 10 µm se nombran PM10, las menores de 2,5 µm se conocen como PM2.5, y las menores de 1 µm se nombran PM1. Una de las industrias tradicionalmente reconocidas como fuente de PM son las cementeras. Aunque hay numerosos estudios dedicados a las PM alrededor de cementeras, éstos suelen enfocarse en las PM10, ignorando la importancia de aquéllas más pequeñas, y que pueden llegar a zonas más profundas del aparato respiratorio. En la presente tesis se recogieron PM10, PM2.5 y PM1 en un área influenciada por una cementera en diferentes estaciones. Posteriormente, se llevó a cabo una caracterización fisicoquímica de estas partículas, para estudiar sus riesgos inhalatorios y contribución de la cementera al total de PM ambiental. Además, parte de estas partículas se dedicaron a hacer ensayos de in-vitro con células respiratorias, para evaluar su toxicidad. Los mayores niveles de PM se registraron en invierno. Además, se encontró que más del 60% de las partículas respirables son PM1. Esta última fracción contuvo los mayores niveles de algunos metales pesados e hidrocarburos policíclicos, presentando los mayores riesgos para la población. Las pruebas in-vitro revelaron que la fracción fina (PM2.5) daba lugar a una toxicidad general mayor que las PM10. Por último, la contribución de la cementera al total de PM ambiental resultó patente y dependiente del estado productivo de la planta. Los resultados de esta tesis muestran la importancia de estudiar las partículas finas (PM2.5 y PM1) en entornos influenciados por fábricas de cemento.
Particulate matter (PM) is the most dangerous air pollutant for human health. Particulate matter is composed of solid and liquid particles floating in the air and having different size and chemical composition. PMs are usually classified according to their size. Thus, those with a diameter smaller than 10 μm are named PM10, those smaller than 2.5 μm are known as PM2.5, and those smaller than 1 μm are referred as PM1. Cement plants are one of the industries traditionally recognized as sources of PM. Although there are numerous studies dedicated to PM around cement factories, they tend to focus on PM10, ignoring the importance of smaller PM, which can reach deeper areas of the respiratory system. In the present thesis PM10, PM2.5 and PM1 were collected in an area influenced by a cement plant in different seasons. Subsequently, a physicochemical characterization of these particles was carried out to study their inhalation risks and the cement plant's contribution to the total environmental PM. In addition, to evaluate their toxicity part of these particles was dedicated to performing in-vitro tests with respiratory cells. The highest PM levels were recorded in winter. In addition, it was found that more than 60% of the respirable particles are PM1. This last fraction contained the highest levels of some heavy metals and polycyclic hydrocarbons, presenting the greatest risks for the population. In-vitro tests revealed that the fine fraction (PM2.5) resulted in a higher overall toxicity than PM10. Finally, the contribution of the cement company to the total environmental PM was clear and dependent on the productive state of the plant. The results of this thesis highlight the importance of studying fine particles (PM2.5 and PM1) in environments influenced by cement factories.
Alves, Leandro Augusto Bassi. "Avaliação da qualidade ambiental de estabelecimentos comerciais da região central de São Carlos, SP." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-03102013-113541/.
Повний текст джерелаThis study presents the indoor environmental quality of stores in central São Carlos, an inner city of the state of São Paulo, in Brazil. The following parameters were monitored: mass concentration of particulate matter, in its fractions PM10 and PM2.5, noise levels, temperature and relative humidity. Data was collected in three stores in the center of town during seven hours daily, from 10 a.m. to 5 p.m. The stores had, in average, temperature values 5.1 °C higherand relative umidity 35.5% lower than those observed in a weather station located in the countryside. High correlation coefficient between the climate data in the stores and in the weather station was found, indicating that the external environment has great influence in the internal environments studied. Of all samples, 54% indicated thermal discomfort. PM2.5, mass concentrations ranged from 11.4 to 40.6 μg.m-3, exceeding the 24 h WHO guideline (25 μg.m-3) in 35% of the samples. PM10 mass concentrations ranged from 18.4 to 85.7 μg.m-3, exceeding the 24 h WHO guideline (50 μg.m-3) in 33% of the samples. The average inside/outside (I/O) ratio of the particulate matter was of 0.84 for the PM2.5 and 0.88 for the PM10. Mass concentration was 1.8 times greater in the dry season than in rainy season for the PM10, and 1.2 times greater for the PM2.5. Average PM2.5/PM10 ratio was 56%. Correlation coefficient between the gravimetric and particle counter equipments used to determine PM mass concentration was of 0.40 for the PM2.5 and 0.53 for the PM10, and latter had average means 4.2 and 2.0 times smaller, for PM2.5 and PM10, respectively. Noise levels ranged from 50.6 to 67.2 dBA in the internal environment and 56.6 to 72.8 dBA in the external environment, with an average I/O ratio of 0.91. Concerning the 70 dBA daily exposure limit estipulated by WHO, 9% of the sampled days exceeded that value. The location with higher noise pollution was located in front of the street with higher vehicle traffic, and the one with lower noise pollution was located in a street with often congested traffic.
Pires, Adriana. "Efeito da exposição ao material particulado (PM2,5) da poluição atmosférica na espermatogênese de duas gerações de camundongos." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/5/5144/tde-09122009-154418/.
Повний текст джерелаThe present paper describes the effects of real exposure to urban PM2.5 on spermatogenesis by histological analysis of testes of mice (BALB/c) from two generations during fetal or postnatal phases of development and of mice exposed in both phases of development. Parental generations (BALB/c mice) were exposed to air pollution in chambers with or without filters for PM2.5 for 4 months (filtered and non-filtered chambers, respectively), forming two groups, namely non-exposed and exposed. These animals were mated and a frequency of decrease on vaginal plug in the exposed females was observed (p>0.05). The number of pregnant females was reduced as well (p=0.007) and the number of born alive decreased in the non-filtered chamber (186) when compared to the filtered chamber (268); however, the litter size was not altered (p>0.05). After mating, the male were killed, their testes were weighed and fixed in Bouins solution or 4% paraformaldehyde and stained in H&E, PCNA, Ki67 or TUNEL. Half of 1-day old offspring was crossed over between chambers forming the prenatal and postnatal groups; remaining offspring from filtered and non-filtered chambers comprised the non-exposed and pre+postnatally exposed groups, respectively. After 90 days, the animals from first generation were killed and their testes were removed, weighed, fixed and stained like the parental generation. The animals exposed to PM2.5 from the parental generation showed increased testis weight (p=0.002), epididymis weight (p<0.001), relative testis weight (p=0.003), and relative epididymis weight (p=0.001). The germ and somatic cells number was not reduced, and neither was cell proliferation (p>0.05). The apoptosis labeled by H&E was reduced in stage IV (p=0.046) and increased in stage VIII (p=0.019) of spermatogenesis. By using the TUNEL technique, stages IV (p=0.017), V (p=0.035) and VIII (p=0.024) showed fewer apoptosis in the exposed animal group. Stage IV was identified as the most spontaneous apoptosis in both methods: HE (p<0.001) and TUNEL (p<0.001), among the non-exposed animals. The cycle of the seminiferous epithelium was altered with reduced frequency of stage IV between the exposed animals (p=0.005). The animals from the first generation exposed during the prenatal period had a reduced body (p<0.001) and testis weight (p=0.012) and an increased relative testis weight (p=0.013). Differences in germ cell proliferation, apoptosis, and staging were not significantly different among treatment groups (p>0.05). Nevertheless, germ cell populations of post- (p=0.011) and pre+postnatally (p=0.035) PM-exposed animals contained an increased percentage of spermatocytes, while pre- and postnatal groups (p<0.001) had a reduced number of elongated spermatids. Stage IV was shown to be the most sensitive for the occurrence of spontaneous apoptosis in both methods used: H&E (p<0.001); and TUNEL (p<0.001). The normal frequency of the stages between non-exposed animals showed that the final stages are more frequent (VI, VIII e VII) and the beginning stages less frequent (II e I) to both generations. These results suggest that PM2.5 from urban air pollution is capable of altering the male reproductive system and spermatogenesis independently of the period of life when the animals are exposed to it (during or after pregnancy).
Книги з теми "Particulate matte"
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Знайти повний текст джерелаЧастини книг з теми "Particulate matte"
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Повний текст джерелаТези доповідей конференцій з теми "Particulate matte"
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Повний текст джерелаЗвіти організацій з теми "Particulate matte"
Howard, Robert P., Kathryn M. Stephens, Philip D. Whitefield, Donald E. Hagen, Steven L. Achterberg, Elizabeth A. Black, Scott C. Herndon, Michael T. Timko, Richard C. Miake-Lye, and John S. Kinsey. Interim Particulate Matter Test Method for the Determination of Particulate Matter from Gas Turbine Engines. Fort Belvoir, VA: Defense Technical Information Center, July 2011. http://dx.doi.org/10.21236/ada575278.
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