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| Registros recuperados: 27 | |
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| Rodrigues,Luiz Antonio da Costa; Agostini,Kamila da Matta; Alencar,Alexandre Santos de; Mendonça,Cláudia Barbieri Ferreira; Carvalho,Marcelo Araújo de; Gonçalves-Esteves,Vania. |
| ABSTRACT The procedures for a set of techniques to recover grains of pollen 26 and spores from liquid samples are described. Liquefied samples of matrices, such as melting lakes, snow and ice, can provide a record of climatic and environmental events at different geographic and temporal scales. The need for standardization of techniques was demonstrated in research carried out with matrices of snow and water of thawing lakes and snow collected on King George and Joinville islands (Antarctica). The use of the methods described can permit increased rescue of palynomorphs from liquid matrices, thereby adding greater reliability to palynological data and its use as a biotracer of environmental events. Methods of sieving and centrifugation were tested, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antarctica; Ice; Spores; Snow; Technique to recover grains of pollen. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400667 |
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| Freitas,Aline Gonçalves de; Carvalho,Marcelo de Araujo; Toledo,Mauro Bevilacqua de; Mendonça,Claudia Barbieri Ferreira; Gonçalves-Esteves,Vania. |
| This paper presents morphological descriptions and ecological data of cryptogam spores and other non-pollen palynomorphs from Quaternary sediments of Campos Basin, Rio de Janeiro, SE Brazil. The ages were derived from biostratigraphy of planktonic foraminifers and two radiocarbon dates, and suggest that sediment deposition started in the last 140,000 years BP. Thirty different types of palynomorphs were identified, described, and photographed: two bryophyte spores (sensu lato); 21 pteridophyte spores; four freshwater microalgae; onePseudoschizaea; and two microfungi. Some of the identified spores (Sphagnum, Blechnum, Cyatheaceae, Dennstaedtiaceae, Lycopodiella, Microgramma, Polypodium, Acrostichum, Pityrogramma, and Lygodium) are related to the modern... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Campos Basin; Late Pleistocene; Non-pollen palynomorphs; Paleoecology; Spores. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200161 |
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| Hiendlmeyer,Rosane; Randi,Aurea Maria. |
| Light is a limiting factor for fern stablishment because it controls germination of light sensitive spores. The aim of this work was to study the effect of light levels on spore germination in two ornamental ferns native to the Atlantic forest, under natural conditions. Cyathea delgadii is a tree fern and Blechnum brasiliense, a subarborescent fern. The effect of light levels was analyzed in April and July/2003, in Florianópolis, Santa Catarina state, Brazil. Sterilized spores were sown in Erlenmeyer flasks containing mineral culture medium with macronutrients, iron, and benomyl 0.01%. The Erlenmeyer flasks were kept in 50 cm³ boxes covered with black shade netting, which gave 5, 22, 42, and 62% natural light. Irradiance and temperature were scored daily... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ferns; Germination; Light levels; Photoinhibition; Spores. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000400015 |
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| GIACOSA,JUAN P. RAMOS; MORBELLI,MARTA A.; GIUDICE,GABRIELA E.. |
| The genus Lygodium Sw. is one of the few climbing ferns in the world. The spores of L. venustum Sw. and L. volubile Sw. were studied using light, scanning, and transmission electron microscopy. This work is based on herbarium material. The spores are trilete, triangular, with straight to convex sides in polar view. The equatorial diameter is 72-104 µm, and the polar diameter is 64-84 µm. The ornamentation in L. venustum is verrucate-tuberculate while in L. volubile, it is verrucate-tuberculate in the proximal face but with a few ridges on the distal face, where a micro-ornamentation constituted by verrrucae and tubercles is observed. An equatorial ridge is also present. The exospore is two-layered; in L. venustum, it is smooth in contrast with the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lygodiaceae; Lygodium; Morphology; Spores; Ultrastructure. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200699 |
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| Ramos Giacosa,Juan P; Morbelli,Marta A; Giudice,Gabriela E. |
| The spores of Schizaea fistulosa from Chile were studied using light microscopy (LM), scanning (SEM) and transmission electron microscopy (TEM). The spores are monolete and elliptic in polar view. The major equatorial diameter is 71-85 µm and the polar diameter is 54-61 µm. The laesurae are 50-60 µm long and, in some cases, bifurcated. The sporoderm ultrastructure is first mentioned and described here. The exospore is two-layered in section, verrucate-tuberculate with single or fused elements forming short ridges. The perispore is single-layered, 10-30 nm thick and it is only visible under transmission electron microscopy. On the spore surface, numerous, single or fused, spheroids and nanospheroids of different sizes were observed attached to the perispore... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Schizaeaceae; Schizaea fistulosa; Spores; Morphology; Ultrastructure. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722015000100003 |
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| Sella,Sandra Regina Barroso Ruiz; Guizelini,Belquis Palácio; Vandenberghe,Luciana Porto de Souza; Medeiros,Adriane Bianchi Pedroni; Soccol,Carlos Ricardo. |
| Studies were conducted to evaluate Bacillus atrophaeus spores' production by solid-state fermentation (SSF) using sugarcane bagasse as support and soybean molasses as substrate at lab-scale in column bioreactors (forced aeration), plastic bags and Erlenmeyer flasks (aeration by diffusion). Different moisture contents (84%, 86% and 88%; 89%, 91% and 93%) and aeration rates (30mL/min, 45mL/min, 60mL/min and 90mL/min) were studied. The best condition for spore production (3.3x10(10) CFU.g-¹dry matter) in column bioreactor was 80% of initial humidity and no aeration. In Erlenmeyer flasks and plastic bags the best sporulation production reached 1.7 up to 4.7x10(10) CFU.g-1dry matter with 88-93% of initial moisture. The aeration rate had no significant effect on... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus atrophaeus; Spores; Solid state fermentation; Column bioreactor; Biofilm. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000700021 |
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| ANJOS,Taís Ramalho dos; CAVICCHIOLI,Valéria Quintana; LIMA,Joyce Aparecida Santos; VASCONCELLOS,Alenia Naliato; VAZ,Andréia Cristina Nakashima; ROSSI,Gabriel Augusto Marques; CAMPOS-GALVÃO,Maria Emilene Martino; TODOROV,Svetoslav Dimitrov; MATHIAS,Luis Antonio; SCHOCKEN-ITURRINO,Rubén Pablo; NERO,Luís Augusto; VIDAL,Ana Maria Centola. |
| Abstract Spore forming bacteria can play an important role in food quality and safety as spoilage and pathogenic microorganisms due to resistance to heat-treatment. However, there are limited number of studies focused on evaluate the microbiological quality and the occurrence of these bacteria in UHT goat milk, soymilk and dairy beverage of goat milk and soy protein. In this context, 75 samples of these beverages were evaluated regarding heterotrophic mesophilic microorganisms by conventional plate count and selective methods to detect microorganisms from Bacillus cereus group and Clostridium perfringens. Population counts greater than 104 CFU.ml-1 of heterotrophic mesophilic microorganisms were observed in 80% of the lots of goat milk and 100% of the lots... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Foodborne pathogens; Microbiology; PCR; Spores. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612020005006202 |
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| Sangabriel Conde, Wendy. |
| Los hongos micorrízicos arbusculares (HMA) forman una asociación simbiótica con las raíces de las plantas, favoreciendo un incremento en la asimilación de nutrientes del suelo. Los HMA colonizan la mayoría de los cultivos agrícolas; entre ellos, el cultivo del papayo presenta alto grado de dependencia micorrízica. Sin embargo, se cree que esta asociación es afectada por las prácticas de manejo utilizadas. Por lo que, en este trabajo se estudió la diversidad y distribución de especies de HMA así como la colonización y potencial infectivo de éstas en huertas de papayo bajo diferente manejo de producción en Isla, Veracruz. Como resultado de esta investigación, se presenta esta tesis estructurada fundamentalmente en cuatro capítulos. El primero,... |
| Tipo: Tesis |
Palavras-chave: Diversidad; Esporas; Hongos micorrízico-arbusculares; Maestría; Agroecosistemas Tropicales; Diversity; Spores; Arbuscular mycorrhizal fungi. |
| Ano: 2008 |
URL: http://hdl.handle.net/10521/1508 |
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| Pelayo Sánchez, Gabriela. |
| Se evaluó el efecto de seis concentraciones de conidios de Penicillium digitatum con el objetivo de determinar la concentración óptima que permita 100% de infección en frutos de limón persa en postcosecha. El hongo se aisló de frutos de limón mexicano del estado de Colima, Méx. Cada concentración (1 x 105, 3 x 105, 5 x 105, 7 x 105, 9 x 105, 1 x 106 esporas mL-1), se colocó en heridas de 2 mm profundidad x 1mm de ancho, aproximadamente, hechas en frutos en etapa de madurez de corte. Las concentraciones 1 x 105 y 3 x 105 esporas mL-1 mostraron una incidencia de 33 y 50 % de infección, respectivamente, mientras que los frutos inoculados con 5 x 105, 7 x 105, 9 x 105 y 1 x 106 esporas mL-1 presentaron 100% de incidencia de la enfermedad. Asimismo, se... |
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Palavras-chave: Esporas; Concentración; Infección; Control; Fungicidas; Eficiencia; Spores; Concentration; Infection; Fungicides; Efficiency; Fitopatología; Maestría. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/1684 |
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| Registros recuperados: 27 | |
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