Results 21 to 30 of about 5,698 (187)

Reference Frames and Astronomy Teaching: The Development of a Topocentric Approach to the Lunar Phases

open access: yesScience Education International, 2019
Research related to the teaching and learning of the lunar phases reveals a low level of understanding of this astronomical phenomenon by most students of all educational levels.
Diego Galperin, Andrés Raviolo
doaj   +1 more source

Gyrochorte “highways” and their environmental significance in shallow-marine sediments [PDF]

open access: yesActa Palaeontologica Polonica, 2020
The reworking of a trace by a subsequently following organism represents a so-called sequorichnial behavior and leads to formation of a “burrowing highway”. Burrowing highways occur more frequently than assumed in the fossil record.
Andreas Wetzel   +2 more
doaj   +1 more source

Río Negro

open access: yesLatin American Literary Review, 2021
El cuento relata el viaje de tres amigos. Un viaje de reconciliación consigo mismos. Huyen, pero también se encuentran.
Claudia Andrea Michel
doaj   +1 more source

El “territorio” y la “salud” en contexto de pandemia

open access: yesAlbuquerque, 2021
El artículo pretende analizar los lenguajes contenciosos habilitados en el campo de la política para dirimir las disputas territoriales que atraviesa el Pueblo Mapuche Tehuelche en Argentina.
Ana Margarita Ramos   +1 more
doaj   +1 more source

Dumont no rio Negro?

open access: yesMaloca: Revista de Estudos Indígenas, 2020
Este ensaio pretende testar aproximações e divergências dos conceitos de hierarquia e sistema em relação ao modo que eles foram pensados por Louis Dumont para a Índia. Parte-se de uma problematização a respeito do “transporte” de conceitos aplicados a realidades etnográficas bastante distintas, para depois tentar, em um regime de aproximações ...
openaire   +2 more sources

Rios da Bacia Amazônica. I. Afluentes do rio Negro [PDF]

open access: yesActa Amazonica, 1984
Foram analisadas e comparadas neste trabalho, quanto às qualidades físico-químicas, amostras de água de 29 (vinte e nove) afluentes do rio Negro, A maioria das águas e muito pobre em sais dissolvidos, e por outro lado bastante ácida, sendo observado que.
Santos, Umberto de Menezes   +4 more
openaire   +5 more sources

The food spectrum of the cardinal - tetra (Paracheirodon axelrodi, Characidae) in its natural habitat Estratégias alimentares do cardinal-tetra (Paracheirodon axelrodi, Characidae) em seu ambiente natural

open access: yesActa Amazonica, 2004
The cardinal tetra (Paracheirodon axelrodi) is the most intensively commercialized ornamental fish from the Rio Negro Basin (Amazonas State, Brasil). Analysis of the stomach and gut contents of fish caught in their natural habitats show conclusively that
Ilse Walker
doaj   +1 more source

Impacto del sacrificio de la arteria radial en la perfusión de la mano. [Impact of radial artery sacrifice in hand perfusion.]

open access: yesRevista de la Asociación Argentina de Ortopedia y Traumatología, 2017
Introducción El ortopedista se enfrenta a situaciones donde impera el sacrificio de la arteria radial, ya sea en el uso del árbol arterial radial como donante de tejido vascularizado en el colgajo de circulación reversa o en situaciones donde la arteria
Gustavo Alberto Breglia   +3 more
doaj   +1 more source

Omnivory and resource - sharing in nutrient - deficient Rio Negro waters: stabilization of biodiversity? Omnivoria e repartição de recursos em águas pobres em nutrientes da Bacia do Rio Negro

open access: yesActa Amazonica, 2009
Amazonian biodiversity is notorious, this is also valid for the fauna of the mineral-deficient waters of the Rio Negro System. Some 25 years of research on the benthic fauna of Central Amazonian streams resulted in species-rich foodwebs with a high ...
Ilse Walker
doaj   +1 more source

Developmental morphology of claspers and clasper‐glands during maturation in Potamotrygon wallacei (Chondrichthyes: Potamotrygoninae)

open access: yesThe Anatomical Record, EarlyView.
Abstract The claspers are the copulatory organs in male elasmobranchs, responsible for directing the semen into the female cloaca (C). However, the microscopic morphology of the claspers remains poorly understood. This study describes the morphology of the claspers and clasper glands (CGs) of cururu stingray (Potamotrygon wallacei) at different ...
Matheus Samuel Cunha Braga   +4 more
wiley   +1 more source

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