Results 21 to 30 of about 298 (167)
Ultra-estrutura do rim na deficiência de colina experimental.
Acta Médica Portuguesa, 1985 Tem sido postulado corno mecanismo patogenético básico da degeneração hemorrágica dos rins na deficiência de colina, um distúrbio circulatório renal causado por um desequilíbrio entre catecolaminas vaso-constritoras e um vaso-dilatador do tipo ...
Roberto S. Costa, Marcos A. Rossi
doaj +2 more sources
Caracterização ultra-sônica de materiais ferroelétricos com estrutura perovskita e tungstênio-bronze [PDF]
Cerâmica, 2002 Atenuação e velocidade ultra-sônicas e, consequentemente, o módulo de Young de cerâmicas ferroelétricas com estrutura do tipo perovskita e tungstênio-bronze foram medidas entre 2,5 e 30 MHz, à temperatura ambiente, utilizando-se a técnica de pulso-eco ...
A. Moreno-Gobbi +5 more
doaj +3 more sources
Ocorrência, morfologia e ultra-estrutura da glândula de Dufour de Scaptotrigona postica Latreille (Hymenoptera: Apidae) [PDF]
Neotropical Entomology, 2005 The Dufour gland is an accessory gland of the bee reproductive female apparatus. In neotropical stingless bees, this gland has been poorly investigated, concerning to developmental, morphological or biochemical characteristics. In order to collaborate with the knowledge of the Dufour gland in stingless bees, a study of its occurrence, morphology and ...
Fabio Camargo Abdalla +2 more
exaly +5 more sources
Anatomia e ultra-estrutura foliar de Cyperus maritimus Poir. (Cyperaceae): estratégias adaptativas ao ambiente de dunas litorâneas [PDF]
Acta Botanica Brasilica, 2008 Foram analisados aspectos anatômicos e ultra-estruturais foliares de Cyperus maritimus Poir. visando identificar caracteres adaptativos ao ambiente de dunas litorâneas. Para isto, indivíduos ocorrentes nas dunas da Praia de Pipa, Rio Grande do Norte, Brasil, tiveram as folhas submetidas a diferentes análises: microscopia de luz, eletrônica de varredura
Silvia Rodrigues Machado, Alves Marccus
exaly +6 more sources
Has a river dam affected the life‐history traits of a freshwater prawn? [PDF]
Ecology and Evolution, 2020 In recent years, species richness and diversity in aquatic ecosystems has declined as environments are increasingly impacted by anthropic actions. Freshwater prawns are well adapted to survive in a disturbed and heterogeneous environment.
Gicelle M. F. Silva +6 more
doaj +2 more sources
Histoquímica e ultra-estrutura da ontogênese dos tetrasporângios de Hypnea musciformis (Wulfen) J. V. Lamour. (Gigartinales, Rhodophyta) [PDF]
Revista Brasileira De Botanica, 2006 Tetraspore development was studied in Hypnea musciformis (Wulfen) J. V. Lamour. using light and electron microscopes, and techniques of histochemistry. Tetrasporangial differentiation arises from a cortex cell that enlarges. This cell undergoes mitosis to form a tetrasporangial mother cell and a stalk cell.
Zenilda Bouzon
exaly +4 more sources
Memorias do Instituto Oswaldo Cruz, 1989 Ultrastructural analyses revealed the presence of six hemocyte types in the hemolymph of Panstrogylus megistus, partially confirming our previous results obtained through light microscopy. Prohemocytes: small, round hemocytes with a thin cytoplasm layer,
Margherita A. Barracco, Clarice T. Loch
doaj +2 more sources
Revista Brasileira de Fruticultura, 2002 Mangas 'Tommy Atkins' produzidas na região de Ibirá, São Paulo, foram pulverizadas na pré-colheita com cloreto de cálcio, nas concentrações de 0,0%, 2,5% e 5,0%, em três épocas de seu desenvolvimento (40; 60 e 90 dias após a floração) a fim de verificar ...
EVANGELISTA REGINA MARTA +2 more
doaj +2 more sources
Journal of Pharmacological Sciences, 2003 : Propolis is a bee product, which has long been used in folk medicine for the management of different diseases. In this study we evaluated the analgesic and anti-inflammatory effects of a standard ethanolic extract of Bulgarian propolis (Et-Blg) in mice
Niraldo Paulino +6 more
doaj +1 more source
Fisheries management influences phytoplankton biomass of Amazonian floodplain lakes
Journal of Applied Ecology, Volume 58, Issue 4, Page 731-743, April 2021., 2021 Tropical freshwaters fisheries typically assume that fish biomass is controlled by bottom‐up mechanisms, so that overexploitation of large predators would not affect overall ecosystem productivity. Our results, however, show that top‐down forces are important drivers of primary productivity in tropical lakes, above and beyond the effects of bottom‐up ...
João Vitor Campos‐Silva +6 more
wiley +1 more source