196,576 research outputs found
Impacto das políticas de lazer na região do bairro Aero Rancho. Campo Grande/MS
No full textImpacto das políticas de lazer na região do bairro Aero Rancho. Campo Grande/MS / Felipe Soligo Barbosa, Luciane Coelho Rabel, Joyce Priscila Samudio da Silva, Julio Arani Pinheiro Xavier. – Campo Grande: UCDB, 2009As políticas de lazer são foco de inúmeras pesquisas e publicações no País, nos dias atuais (BARBOSA, 2008; MARCELLINO, 2002a, 2003; MARIANO, 2008; MENNEH, 2002). São eixos fundamentais de uma política de lazer: o uso do espaço urbano e a construção e animação dos equipamentos de lazer (BARBUY, 1980; MARCELLINO, 2002a; SANTOS, 1982; WILHEIM, 1976). Desse modo, é imprescindível para a democratização do lazer, mais especificamente dos conteúdos físico-esportivos, a elaboração de políticas públicas. Entretanto, não se pode deixar levar pela falácia do tarefismo, ou da política de atividades que, na maioria das vezes, acabam por constituir-se em eventos isolados e não em políticas de animação como processo. Faz-se necessário também atenção aos quatro eixos de uma política de lazer: reordenação da jornada de trabalho; reordenação do solo urbano, incluindo aí os espaços e equipamentos específicos de lazer; política de formação e desenvolvimento de pessoal para que os profissionais envolvidos trabalhem de forma coerente com os conceitos atuais e uma política de animação (MARCELLINO, 2007a).rede CEDES / M
Radon as a natural tracer for monitoring napl groundwater contamination
No full textIn this research, the radioactive noble gas radon was used as a tracer for Non-Aqueous Phase Liquids (NAPLs) contamination, since it is much more soluble in these substances than in air or water. Soil radon remains trapped within the NAPLs, resulting in a local reduction in the radon concentration within close proximity to the contaminated area. This technique was applied to a contaminated site in Roma (Italy). The main residual NAPLs are total hydrocarbons and methyl-tertiary-butyl ether (MTBE), a water-soluble additive. The monitoring activities included two sampling campaigns of groundwater from 18 wells in February and May 2020. Concentration maps were produced using radon data. The results show that the radon deficit traces the location of NAPLs in the fuelling station very well, with a residual source zone extending in a NNW-SSE direction. A good correspondence between a low amount of radon and a higher concentration of NAPLs was found. A reduction in the average amount of radon in the May 2020 survey indicated a stronger remobilization of NAPLs compared to that of the February 2020 monitoring campaign. The peaks of Volatile Organic Compounds (VOCs) detected between 8–9 and 11–12 m depths indicate the presence of residual blobs of NAPLs in the vadose zone of the aquifer
Tracing NAPL Contamination of Groundwater Using Natural Radon: A Case-Study in Roma (Central Italy)
No full textIn this research, the radioactive noble gas radon was used as a
tracer for Non-Aqueous Phase Liquids (NAPLs) contamination,
since it is much more soluble in these substances than in air or
water. Soil radon remains trapped within the NAPLs, resulting in
a local reduction in the radon concentration within close
proximity to the contaminated area. This technique was applied
to a contaminated site in Roma (Italy). The main residual NAPLs
are total hydrocarbons and methyl-tertiary-butyl ether (MTBE), a
water-soluble additive. The monitoring activities included four
sampling campaigns of groundwater from 18 wells from
February 2020 to February 2021. Concentration maps were
produced using radon data. The results show that the radon
deficit traces the location of NAPLs in the fuelling station very
well, with a residual source zone extending in NNW-SSE
direction. A good correspondence between a low amount of
radon and a higher concentration of NAPLs was found. The
peaks of Volatile Organic Compounds (VOCs) detected between
8–9 and 11–12 m depths indicate the presence of residual blobs
of NAPLs in the vadose zone of the aquifer
Using 222-Radon as tracer for areal and vertical distribution of hydrocarbon contaminations
No full textNon-aqueous Phase Liquids (NAPLs), including crude oil and its refined products, produce a long lasting
impact on the enviroment due to unwilling releases. Storage sites of fuel and pump stations are often involved
in unwilling NAPL spills in the subsoil and/or groundwater. The non-polar nature of these contaminants
confers them a slight solubility in water, causing a reduced efficency of the most common remediation
techniques. These limitations result in long-term remediation activities with high related costs. Unconventional
characterization methods like the Radon (222Rn)-deficit technique are meant to supplement and optimize the
conventional approach by providing dense spatial information in quasi-real time, and at a reasonable cost
(De Miguel et al., 2020). Schubert (2015) presented a comprehensive review of the use of 222Rn as a natural
tracer to assess subsurface NAPL contamination. In the present work Radon deficit technique was applied to
determine the vertical distribution of Rn in groundwater inside a gasoline contaminated area. Twelve passive
accumulators PDMS-AC (polydimethylsiloxane mixed with activated carbon) were inserted at different depth
inside fenestrated piezometers and left for two weeks to maximize the Rn accumulation. Then they were
measured by high resolution gamma spectometry. PDMS-AC are characterized by a high permeability to Rn
and impermeability to water (Voltaggio & Spadoni, 2013). The obtained results suggest the possible application
of Radon deficit to find not only the areal but also the vertical distribution of a NAPL contamination in the
saturated level. This datum could offer interesting applications to estimate initial and residual volumes of the
contaminant during remediation procedures
U/Th dating of a tufa deposit from the Carsoli intramontane basin (Abruzzo, Italy)
No full textA few km far from the confluence of the Fioi valley into the Carsoli basin, some hundreds m2 wide and ca. 1.5 m thick carbonatic deposit is present, embedded within late Middle Pleistocene alluvial gravel. The deposit formation might be related to sub-aerial deposition of CaCO3 (tufa) from emerging groundwater. A U/Th dating to 46 ± 6 ka BP constrains the deposit within the MIS 3, corresponding to a phase of warming between the MIS 4 and 2
Identification of kinetochores and DNA synthesis in micronuclei induced by mitomycin C and colchicine in Chinese hamster ovary cells.
No full textThe presence of kinetochore and DNA synthesis in micronuclei (MN) induced in Chinese hamster ovary (CHO) cells by clastogenic and aneuploidogenic substances such as mitomycin C (MMC) and colchicine was determined by immunofluorescence technique using CREST antikinetochore antibodies and anti-bromodeoxyuridine (BrdUrd) antibodies. A cytofluorimetric analysis was also performed. Colchicine significantly increased micronucleated cells at least up to 96 h from the end of treatment. As expected, among colchicine-induced micronucleated cells the majority contained at least one CREST + MN. MMC induced a significant increase in micronucleated cells up to 120 h from the end of treatment and the great majority of MN lacked kinetochore fluorescence, indicating that MMC-induced MN were derived from acentric fragments. However, colchicine and MMC at 48 and 72 h from the end of treatment induced a significant increase of CREST- and CREST + MN, respectively, suggesting an induction of clastogenicity by colchicine and aneuploidy by MMC. The clastogenic effect of colchicine after 48 h was also confirmed by the presence of chromatid fragments in metaphase cells. A cytofluorimetric analysis indicated that, as aspected, colchicine and MMC interfere with the G2/M and S phases, respectively; however, a slight interference of colchicine with the S phase was also observed. DNA synthesis was present in MN and it was in most cases synchronous with synthesis in the main nucleus. The frequency of cells with MN in S phase observed in untreated or MMC-treated cells is in agreement with the proportion of cells without MN showing DNA synthesis. On the contrary, the frequency of cells with MN in S phase observed in colchicine-treated cells was significantly lower than that observed in control and MMC-treated cells
Isterectomia vaginale e addominale: confronto e prospettive. A proposito di 385 consecutivi
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