Results 11 to 20 of about 1,484 (212)
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 +3 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
exaly +6 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
DIFERENTES NÍVEIS DE BETAÍNA NA RAÇÃO DE SUÍNOS SOBRE A ESTRUTURA E ULTRA-ESTRUTURA DA MUCOSA INTESTINAL [PDF]
Ciência Animal Brasileira, 2015 Foram avaliados os efeitos da adição de diferentes níveis de betaína (0,0%, 0,1%, 0,2%, 0,3%) sobre amorfologia do intestino delgado. Foram utilizados 52 leitões desmamados aos 23 dias de idade e pesomédio de 5,4 kg, quatro níveis de betaína e cinco ...
Paulo Roberto Ribeiro +6 more
doaj +4 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.
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
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
Retinal toxicity effects of intraocular injection of bupivacaine in rabbits [PDF]
, 2002 Purpose: To evaluate morphologic alterations caused by intravitreous injection of bupivacaine, a long-term local anesthetic agent much used in ocular regional blockades, in the retina of albino rabbits.
Farah, Michel Eid +3 more
core +3 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
Características ultra-estruturais do nó sinoatrial de rato Wistar
Acta Scientiarum. Health Sciences, 2008 As características ultra-estruturais do nó sinoatrial (NSA) de 5 ratos machos da variedade Wistar, com 3 meses de idade, foram estudadas por meio de microscopia eletrônica de transmissão (MET). Fragmento pequeno, contendo a região do NSA e área adjacente
Silvana Regina de Melo +2 more
doaj +1 more source