Browsing Facultad de Ciencias Exactas y Naturales by Title
Now showing items 2520-2529 of 2529
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Waste management: a study on generating organic fertilizer from oil and grease trap systems
(Universidad Nacional, Costa Rica, 2022-01-31)The grease and oil trap systems (GOTS) of four university food service establishments (FSE) were assessed and treated to evaluate the potential use of the sludge collected to produce compost. The sludge collected from each ... -
Web 2.0, social networks and E-commerce as marketing tools
(Journal of Theoretical and Applied Electronic Commerce Research, 2014)The spectacular development of the Web 2.0, particularly through online social networks, has awakened much interest in different areas. Marketing is one of them and businesses have decided to experiment with this new type ... -
What do we really know about how velvet worms mate?
(Universidad de Costa Rica (Costa Rica), 2019)After more than a century of studying a phylum that has over 200 species, we only have three reports of the mating itself. Insemination can occur vaginally or through the skin, and it is suspected that the male simply ... -
What do we Think About Water?Public Perception of the Current Situation of Water Resources in Costa Rica: an Indicator of Water Understanding and Management
(Universidad Nacional (Costa Rica), 2020-01-31)The objective of this research was to determine the level of knowledge and perception of the Costa Rican population about water for human consumption, general concepts, the impact of human activities, the ... -
What do we Think About Water?Public Perception of the Current Situation of Water Resources in Costa Rica: an Indicator of Water Understanding and Management
(Universidad Nacional (Costa Rica), 2020-01)The objective of this research was to determine the level of knowledge and perception of the Costa Rican population about water for human consumption, general concepts, the impact of human activities, the ... -
Why do onychophorans and camels need the same gestation time?
(Universidad de Costa Rica (Costa Rica), 2019)One of the many mysteries surrounding onychophorans, is why, despite their small body size, they have gestation periods that are as long as gestation in some mammals. Here we propose that the causes are infrequent feeding ... -
Why do some Australian onychophorans have fantastic heads?
(Universidad de Costa Rica (Costa Rica), 2019)Males of some Australian onychophorans transfer their spermatophores with spectacular structures in their head, such as pits with palps and spines. No one has explained why these structures allow this species to be identified. ... -
Why do velvet worm spermatozoa swim for years?
(Universidad de Costa Rica (Costa Rica), 2019)The sperm of many onychophorans must cross body walls and swim for years before fertilizing an egg. We propose that the cause for such obstacles is the high cost of reproduction in these animals, which leads females to ... -
Zonificación de las áreas propensas a incidentes por ataques de Crocodylus acutus en el Pacífico Central de Costa Rica utilizando un Sistema de Información Geográfico
(Instituto Panamericano de Geografía e Historia (IPGH) (México), 2019-06-27)In recent years, the incidence of attacks by crocodiles in Costa Rica has increased, which is associated with the development of human activities in areas considered as optimal in what I determine as the species’ potential ... -
β- decay of 65Mn to 65Fe
(American Physical Society, 2013-10-07)The low-energy structure of 65Fe has been studied by means of γ and fast-timing spectroscopy at the ISOLDE facility, CERN. A level scheme of 65Fe populated following the β-decay of 65Mn was established for the first time. ...
