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Registros recuperados: 24 | |
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Hernández Tejeda, Tomás. |
Existen diversos factores que pueden influir sobre el deterioro de los ecosistemas forestales del Valle de México y en particular del proceso normal de fecundación y formación de la semilla en los bosques de Pinus hartwegii Lindl., entre los que destacan la contaminación atmosférica por oxidantes fotoquímicos, especialmente el ozono. El objetivo general fue determinar las concentraciones de ozono atmosférico dentro de tres áreas forestales del Valle de México, así como su impacto sobre el follaje y el polen de P. hartwegii. En los bosques de El Ajusco, D. F.; Desierto de los Leones, D. F., y Zoquiapan, Estado de México, se establecieron los nueve sitios de un décimo de hectárea, donde se monitoreo el ozono atmosférico, se realizó la evaluación cualitativa... |
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Palavras-chave: Daño foliar; Fumigación artificial; Granos de polen; Monitoreo de ozono; Pinus hartwegii; Foliar damage; Artificial fumigation; Pollen grains; Ozone monitoring; Botánica; Doctorado. |
Ano: 2014 |
URL: http://hdl.handle.net/10521/2371 |
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Lambert, Clément; Vidal, Muriel; Penaud, Aurélie; Le Roy, Pascal; Goubert, Evelyne; Pailler, Yvan; Stephan, Pierre; Ehrhold, Axel. |
Sedimentological, palynological, and micropalaeontological studies carried out throughout the first half of the Holocene, during the Mesolithic/Neolithic transition in the Bay of Brest (i.e. 9200–9000 and 6600–5300 cal. BP) and in the Bay of Douarnenez (i.e. 9200–8400 cal. BP), allowed characterizing coastal environmental changes under the increasing influence of the relative sea-level rise. The gradual flooding of the two studied sites implied a transition from river valleys to oceanic bays as revealed by the gradual retreat of salt marsh environments, as detected through palynological analysis. In addition, these high-resolution studies highlight the regional imprint of the North Atlantic millennial climate variability in north-western coastal... |
Tipo: Text |
Palavras-chave: Benthic foraminifera; Climate variability; Dinoflagellate cysts; Human impacts; Palaeoenvironments reconstructions; Pollen grains. |
Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00472/58341/60920.pdf |
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Lambert, Clement; Penaud, Aurelie; Vidal, Muriel; Klouch, Khadidja; Gregoire, Gwendoline; Ehrhold, Axel; Eynaud, Frederique; Schmidt, Sabine; Ragueneau, Olivier; Siano, Raffaele. |
For the first time a very high resolution palynological study (mean resolution of 1 to 5 years) was carried out over the last 150 years in a French estuarine environment (Bay of Brest; NW France), allowing direct comparison between the evolution of landscapes, surface water, and human practices on Bay of Brest watersheds, through continental (especially pollen grains) and marine (phytoplanktonic microalgae: cysts of dinoflagellates or dinocysts) microfossils. Thanks to the small size of the watersheds and the close proximity of the depositional environment to the mainland, the Bay of Brest represents an ideal case study for palynological investigations. Palynological data were then compared to published palaeo-genetic analyses conducted on the same core... |
Tipo: Text |
Palavras-chave: Pollen grains; Dinoflagellate cysts; Estuarine dynamics; River runoff; Climate variability. |
Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00410/52110/52813.pdf |
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Aguilar-Sierra,Clara Isabel; Melhem,Therezinha Sant'Anna. |
(Morfologia polínica da tribo Bursereae (Burseraceae) na América do Sul). Dentro da tribo Bursereae, Bursera (L.) Jacq. é um gênero neotropical que compreende sete espécies na América do Sul. Commiphora Jacq., distribuído principalmente nas partes menos úmidas dos trópicos e subtrópicos da África e da Ásia, está representado unicamente por Commiphora leptophloeos (Mart.) Gillet. Foram examinados os grãos de pólen de cinco táxons de Bursereae. O material polínico foi acetolisado, medido, descrito e fotografado sob rnicroscopia óptica e, na maioria dos casos, também em microscopia eletrônica de varredura. As medidas receberam tratamento estatístico adequado ao tamanho da amostra. Os grãos de pólen de Bursera são, geralmente, pequenos, prolato-esferoidais,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Burseraceae; Bursera; Commiphora leptophloeos; Pollen grains. |
Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041998000100003 |
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Zambon,Carolina Ruiz; Silva,Luiz Fernando de Oliveira da; Pio,Rafael; Bianchini,Flávio Gabriel; Oliveira,Adelson Francisco de. |
ABSTRACT In order to ensure success in controlled hybridizations in olive tree cultivation, the information on pollen viability and stigma receptivity is essential. The aim was to establish methodologies that increase the preservation of pollen viability and to establish the time to perform crossbreeds in hybridization studies with olive trees. Three experiments were performed with plants from the cultivar Arbequina, in Maria da Fé, MG, Brazil. In the first experiment, the description of the flower events was performed. In the second, anthers were desiccated in eppendorfs, being stored at three different conditions for pollen viability test: room temperature (27 ºC), refrigerator (8 ºC) and freezer (-10 ºC). In order to evaluate the in vitro germination,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Olea europaea L.; Pollen viability; Pollen grains; Hybridization. |
Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000200291 |
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Santos,Mirane de Oliveira; Lima,Luciene Cristina Lima e; Sales,Margareth Ferreira de; Silva,Juliana Santos. |
ABSTRACT Bernardia and Tragia are the largest genera of the tribes Bernardieae and Plukenetieae (Euphorbiaceae,), with 68 and 125 species, respectively. Very few palynological studies have focused specifically on these genera in spite of the great pollen diversity observed in the family. The present study analyzed the pollen morphology of the Brazilian species of Bernardia and Tragia to identify diagnostic characteristics that could aid in their taxonomic circumscription. The pollen grains of 11 species of Bernardia and five of Tragia were obtained from specimens deposited in the HRB, HUEFS, PEUFR, RB and UFP herbaria, and were analyzed using light and scanning electron microscopy. The analyzed species had small- to medium-sized pollen grains in monads,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bernardieae; Pollen grains; Plukenetieae; Plant taxonomy; Tragiinae. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300474 |
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Silveira Júnior,Cristiano Eduardo Amaral; Saba,Marileide Dias; Jardim,Jomar Gomes. |
The palynology of the following 16 species of Rubiaceae, from Brejinho das Amestistas, was investigated: Coccocypselum hirsutum Bartl. ex DC., Cordiera rigida Kuntze, Coutarea hexandra K.Schum., Declieuxia fruticosa Kuntze, Diodella apiculata (Willd. ex Roem. & Schult.) Delprete, D. radula (Willd. ex Roem. & Schult.) Delprete, D. teres Small., Emmeorhiza umbellata K.Schum., Leptoscela ruellioides Hook. f., Mitracarpus baturitensis Sucre., Mitracarpus villosus Cham. & Schltdl., Palicourea rigida Kunth, Psyllocarpus asparagoides Mart., Richardia grandiflora Steud., Staelia aurea K. Schum., and Staelia galioides DC. The pollen grains were acetolysed to and their morphological characters were analyzed using light and scanning electron... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gentianales; Pollen grains; Palynology. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000200020 |
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Avelino,Luciano Oliveira; Santos,Francisco de Assis Ribeiro dos. |
ABSTRACT Propolis is a resin-like substance composed mainly of resin, wax, essential oils, pollen grains and specific plant parts collected by the honeybee Apis mellifera, which mixes them with fluids they secrete. The components and chemical properties of propolis vary among regions. Therefore, in order assess variation in the botanical composition of propolis, 26 samples of propolis (brown, red, and green) produced throughout northeastern Brazil were analyzed by acetolysis specifically adapted for propolis. In total, 196 pollen types were recorded, representing 123 genera and 47 families, with types of Fabaceae and Rubiaceae being present in 100 % of the samples. Fabaceae was the richest group with 49 pollen types, followed by Malvaceae (10 types),... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Apiculture; Apis mellifera; Beekeeping; Palynology; Pollen grains. |
Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400602 |
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Registros recuperados: 24 | |
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