—We describe a new springsnail species, Pyrgulopsis hualapaiensis, from the Lower Colorado River basin (northwestern Arizona) that has an ovateto narrow-conic shell and narrow penis ornamented with a small gland on the distal edge of the lobe. This new species differs from closely similar congeners from the Lower Colorado River basin in several details of female reproductive anatomy and in its ...

Sludge management in waste stabilization ponds (WSPs) is essential for safeguarding the system performance. Sludge accumulation patterns in WSPs are strongly influenced by the pond hydrodynamics. CFD modeling was applied to study the relation between velocity profiles and sludge deposition during 10 years of operation of the Ucubamba WSP in Cuenca (Ecuador). One tracer experiment was performed ...

Los Foraminíferos fósiles de un afloramiento diatomitas en Cobatillas, dentro la Cuenca Neógena Hellín (Albacete), pueden interpretarse como una paleobiocenosis ambiente restringido. ejemplares presentan alteraciones su superficie debido posiblemente al alto contenido sílice del sedimento. La génesis los materiales sedimentarios y fósil cuenca, puede estar relacionada con enfriamiento general M...

José Luís Lobo1; José Antonio Nieto2; Vanesa Zorrilla1; Noelia Garrido2; Olga Madridano3; Justo Ruíz4; Dominique Farge-Bancel5; Gregorio Tiberio6; Fernando Uresandi7; Manuel Monreal8; the RIETE Investigators* 1Department of Pneumonology, Hospital de Txagorritxu, Vitoria, Spain; 2Department of Internal Medicine, Hospital Virgen de la Luz, Cuenca, Spain; 3Department of Internal Medicine, Hospital...

There are 25,000–30,000 playa wetlands in the intensively cultivated Southern Great Plains of the United States. Knowledge of area and watershed influences on wetland flora are needed to guide their conservation. We surveyed plant-community composition in 224 playas over 360,000 km 2 and examined the relationships of species richness and diversity (Shannon’s) to playa area and watershed disturb...

Petroleum-derived products, such as lubricant oils, are non-renewable resources that, after use, must be collected and processed properly to avoid negative environmental impacts. A circular economy of used oils requires the re-refining reuse same. Similar most countries in Latin America, management Ecuador is still incipient few cities collect treat this material properly. In Cuenca, ETAPA comp...

In this paper, we obtain some results on the nonoscillatory behaviour of the system (1), which contains as particular cases, some well known systems. By negation, oscillation criteria are derived for these systems. In the last section we present some examples and remarks, and various well known oscillation criteria are obtained. Universidad de la Cuenca del Plata Lavalle 50 (3400) Corrientes Ar...