Buscar
Mostrando ítems 21-30 de 1133
Diversity of the ichthyofauna in the Serra do Mar State Park- Núcleo Santa Virgínia, Sáo Paulo State, Brazil
(2006-07-01)
The aim of this work was to assess and compare the diversity of the ichthyofauna in three headwater rivers of Paraíba-do-Sul basin in the Serra do Mar State Park, Núcleo Santa Virgínia. A total of 1,774 specimens of 16 ...
Primary productivity maintenance through chlorophyll a changes in Elodea potamogeton during an annual cycle
(Elsevier, 1992)
Measurements of the photosynthetic rate (oxygen exchange) and concentration of chlorophyll a (Chl a) were conducted, during an annual light cycle, in Elodea potamogeton (Bert.) Espinosa, a submerged limnic plant with ...
Characterization of the Interactions between Endocrine Disruptors and Aquatic Humic Substances from Tropical Rivers
(Soc Brasileira Quimica, 2011-01-01)
Interactions between two endocrine disruptors (ED) and aquatic humic substances (AHS) from tropical rivers were studied using an ultrafiltration system equipped with a 1 kDa cut-off cellulose membrane to separate free ED ...
In situ application of a cellulose bag and an ion exchanger for differentiation of labile and inert metal species in aquatic systems
(Springer Heidelberg, 2008-02-01)
This work involved the development and application of a new analytical procedure for in-situ characterization of the lability of metal species in aquatic systems by using a system equipped with a diffusion membrane and ...
Benefits of kinesiotherapy and aquatic rehabilitation on sickle cell anemia. A case report
(Funpec-editora, 2010-01-01)
The process of hemoglobin polymerization and the consequent sickling of red blood cells that occurs in patients with sickle cell disease shortens the half-life of red blood cells. It causes vaso-occlusive complications, ...
Aquatic macrophyte distribution in relation to water and sediment conditions in the Itaipu Reservoir, Brazil
(Kluwer Academic Publ, 1999-11-01)
Aquatic macrophyte community distribution along the eastern shoreline of the Itaipu Reservoir (one of the South America's largest impoundments) is described in relation to limnological and sedimentological factors. The ...
Solar Radiation Effect on the Complexation Capacity of Aquatic Humic Substances with Metals
(Soc Brasileira Quimica, 2012-10-01)
This study had as main objective to assess the effect of solar radiation on the capacity of the aquatic humic substances (AHS) to complex Al3+, Cr3+, CrO42- and Ni2+. Microcosms were prepared with AHS from Preto River ...
Interaction of arsenic species with tropical river aquatic humic substances enriched with aluminum and iron
(2016-04-01)
The mobility and bioavailability of arsenic (As) are strongly controlled by adsorption/precipitation processes involving metal oxides. However, the organic matter present in the environment, in combination with these oxides, ...
The breathing pattern and the ventilatory response to aquatic and aerial hypoxia and hypercarbia in the frog Pipa carvalhoi
(Elsevier B.V., 2012-07-01)
Anuran amphibians are known to exhibit an intermittent pattern of pulmonary ventilation and to exhibit an increased ventilatory response to hypoxia and hypercarbia. However, only a few species have been studied to date. ...
Estimating the isotopic niche of males and females of false killer whales (Pseudorca crassidens) from Magellan Strait, Chile
(Blackwell Publishing Inc., 2018)