Results 41 to 50 of about 194,000 (176)

Pollinator efficiency, rather than bee decline, explains a shift to hummingbird pollination in tropical montane forests

open access: yesNew Phytologist, Volume 251, Issue 4, Page 2237-2247, August 2026.
Hummingbird pollination is a hallmark of American plant diversity and has long been thought to evolve in tropical mountains due to declining bee activity. Using sister species of Costus specialized on bees (C. kuntzei) and hummingbirds (C. wilsonii), we show that this shift is not driven by reduced bee visitation with elevation, but by greater ...
Pedro Juárez   +7 more
wiley   +1 more source

CLASSIFICAÇÃO DE MONTANHAS PELA ALTURA [PDF]

open access: yes, 2005
Existem algumas formas para definir montanhas e classificá-las em classes de tamanho em função de alguns parâmetros: altura, altitude e zona alpina. Neste trabalho é sugerida uma classificação baseada no relevo relativo (altura) que define o seguinte ...
Antonio Paulo Faria
core   +1 more source

Primera contribución a la diversidad de Heteroptera (Insecta: Hemiptera) en un ecosistema pastoril de La Puna de Jujuy (Argentina)

open access: yesActa Zoológica Lilloana
Este trabajo tiene como finalidad presentar una lista preliminar de la composición taxonómica con comentarios sobre las características biológicas y ecológicas, de las Heteroptera presentes en un ecosistema pastoril de la localidad de Santa Catalina ...
Eugenia Fernanda Contreras   +5 more
doaj   +1 more source

Distribución vertical de colémbolos muscícolas en un bosque de Abies religiosa del Estado de México, México

open access: yesRevista Mexicana de Biodiversidad, 2010
Se estudió la distribución de colémbolos asociados a musgos epífi tos, considerando 3 diferentes alturas sobre el árbol soporte: 0 m, 1 m y 2 m. El estudio se realizó en la localidad de San Rafael, Estado de México, en un bosque de Abies religiosa.
Leopoldo Q. Cutz-Pool Cutz-Pool   +3 more
doaj   +1 more source

Impact of bicarbonate on ionized calcium and cardiac function in albumin‐free Langendorff perfusion in hearts of male rats

open access: yesPhysiological Reports, Volume 14, Issue 15, August 2026.
Abstract The adult Langendorff methodology lacks standardization, with inconsistencies in the pH and calcium concentrations of Krebs–Henseleit (K‐H) solution. The aim of this study was to clarify these inconsistencies. Adult male Wistar rat hearts were subjected to 40 or 80 min of global ischemia followed by reperfusion.
Jan Doul   +4 more
wiley   +1 more source

Bionator UFSC: fundamentos e protocolo clínico de tratamento [PDF]

open access: yes, 2014
TCC (graduação) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Curso de Odontologia.A Classe II esquelética, 1ª divisão, de Angle, é uma da maloclusões mais comuns, sendo caracterizada pela relação anteroposterior anormal entre os
Mazzarolo, Leonardo
core  

Is There Life After Death? The Role of Standing Dead Phorophytes in Supporting Tropical Epiphyte Diversity

open access: yesBiotropica, Volume 58, Issue 4, July 2026.
ABSTRACT Global increases in tree mortality from climate change and land‐use are altering forest structures, impacting canopy‐dwelling plants like vascular epiphytes, which depend on host trees (phorophytes). When a phorophyte dies standing, it becomes a snag, the local substrate conditions change and microclimatic exposure may increase, particularly ...
Camila Nardy Delgado   +3 more
wiley   +1 more source

Zonas de altura y páramos, espacios de vida y desarrollo [PDF]

open access: yes
El AVSF coordina los Programas de capacitación para el Manejo de Páramos y Zonas de Altura, dirigido tanto a Técnicos/as de campo como a promotores/as campesinos/as, conjuntamente con el consorcio CAMAREN, desde el año 2006.
Lasso, Renata
core   +1 more source

Aspectos ontogenéticos y bioecológicos de Apanteles ayerzai Brethes (Hymenoptera: Braconidae)

open access: yesActa Zoológica Lilloana, 1990
Se incluye una descripción de los caracteres morfológicos de diferentes estadios inmaduros, con el fin de reconocer esta especie. También se evalúan aspectos sobre biología y ecología de Apanteles ayerzai en relación a sus huéspedes, Ascia monuste y ...
L. E. Neder de Roman   +1 more
doaj  

A Case Report on Maxillary Ameloblastic Fibroma in a 55-Year-Old Man

open access: yesPhilippine Journal of Otolaryngology Head and Neck Surgery
 Ameloblastic Fibroma (AF) accounts for only 2% of all odontogenic tumors.1 It has been shown to be more common in males than females.2 A malignant transformation of this tumor is known as ameloblastic fibrosarcoma.
Ma. Elline Faye Mendoza, Irlan Altura
doaj   +1 more source

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