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Academic literature on the topic 'Spores et grains de pollen'

Author: Grafiati

Published: 25 May 2024

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Journal articles on the topic "Spores et grains de pollen"

1

Jankovská, Vlasta. "Pollen- and Non Pollen Palynomorphs- Analyses from Svalbard." Czech Polar Reports 7, no. 2 (2017): 123–32. http://dx.doi.org/10.5817/cpr2017-2-12.

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We analysed fifteen samples of a shallow profile “Sverrefjellet Volcano “, located in the NW part of Svalbard – Bockfjord region (see Fig.1). Frequency of pollen grains, spores and NPP (Non Pollen Palynomorphs) was quite low. Only the local taxa (e.g. Salix and Cyperaceae) produced pollen in greater abundance. The pollen spectrum was considerably varied, although pollen grains and spores of most taxa were present in low abundances. This was due to low pollen and spores productivity of the Arctic flora, which propagates mostly in a vegetative way. To obtain as much information from the profile

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Santos, R. P., L. M. Rebelo, E. F. Costa, et al. "Sporopollenin Nanostructure of Ilex paraguariensis A.St.Hil Pollen Grains." Microscopy and Microanalysis 11, S03 (2005): 78–81. http://dx.doi.org/10.1017/s1431927605050932.

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Pollens appear like a fine to coarse powder that is liberated by the microsporangia of Gimnosperms and Angiosperms. The pollen grain wall, the sporoderm, envelopes the microgametophytes (male gametophytes), which produce the male gametes of seed plants. Pollen grains are interesting from the material science point of view since the native polymer, the sporopollenin, found in the sporoderm outer layer (exine), is one of the toughest known materials which is degraded by oxidation but is resistant to reduction. This property permits the sporopollenin persistence as an unaltered polymer in sedimen

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3

Gavrilova, O. A., G. A. Firsov, D. A. Gornov, A. N. Semenov, and A. V. Volchanskaya. "Pollen of Pterocarya (Juglandaceae) representatives from natural habitats and St. Petersburg environments." Proceedings on applied botany, genetics and breeding 183, no. 1 (2022): 188–98. http://dx.doi.org/10.30901/2227-8834-2022-1-188-198.

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Background. Comparative palynomorphological studies of naturally occurring and introduced Pterocarya Kunth representatives reveal the taxonomic significance of pollen morphological features and pollen characters of cultivated plants. The quality of pollen material and the potential of the plants from the Botanical Garden of BIN RAS for introduction are characterized.Materials and methods. Pollen grains were investigated using light, confocal laser scanning and scanning electron microscopes. Fertility was assessed using the standard acetocarmine method.Results. Comparison of pollen morphology i

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4

Cyrille, Yao Kouadio, Kouassi Kouamé Alfred, Bie Goha René, Digbehi Zéli Bruno, and Gbangbot Jean Michel Kouadio. "Caractérisation Palynologique et Palynofaciologique de la Marge Est (Marge d’Abidjan) du Bassin Sédimentaire de Côte d’Ivoire." European Scientific Journal, ESJ 18, no. 33 (2022): 144. http://dx.doi.org/10.19044/esj.2022.v18n33p144.

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Des dépôts offshores localisés à l’Est de la marge d’Abidjan (Côte d’Ivoire) ont fait l’objet d’analyse palynologique et palynofaciologique. Elle a porté sur des déblais de forage à partir desquels trente-deux (32) paires de lames minces palynologiques ont été confectionnées. L’objectif était de mettre en évidence les étages du Tertiaire et la limite K-Pg par les palynomorphes stratigraphiques et de déterminer les environnements de dépôt à travers le palynofaciès. Cinq étages ont ainsi été mis en évidence. Ce sont le Maastrichtien supérieur, le Paléocène inferieur, le Paléocène supérieur, l’Eo

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5

Soares, Emílio Alberto Amaral, Rodolfo Dino, Dominicky Peres Soares, Luzia Antonioli, and Marco Antônio Lima da Silva. "New sedimentological and palynological data from surface Miocene strata in the central Amazonas Basin area." Brazilian Journal of Geology 45, no. 3 (2015): 337–57. http://dx.doi.org/10.1590/2317-488920150030283.

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ABSTRACT The scarcity of stratigraphic data has hindered the demarcation of the outcropping area of Miocene deposits of the Amazon Basin, represented informally by the Novo Remanso Formation. Moreover, this unit is characterized by a sparse and irregular geographic distribution due to its sedimentological features and rare fossil content. Miocene deposits cropping out in central Amazonas Basin area were described in sedimentological terms and analyzed palynologically. All analyses were undertaken in samples collected at the Uatumã River banks (Itapiranga and São Sebastião do Uatumã cities). Li

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6

Koppelhus, Eva B. "Palynology of the Lower Jurassic R0nne Formation on Bornholm, eastern Denmark." Bulletin of the Geological Society of Denmark 39 (December 20, 1991): 91–109. http://dx.doi.org/10.37570/bgsd-1991-39-11.

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Outcrop material from the Lower Jurassic R!!nne Formation on the Danish island of Bornholm, in the Baltic Sea, has been investigated palynologically. The 34 samples examined came from sections through the Munkerup, Sose Bugt and Galgel0kke Members, which amount to about 210 m in stratigraphic thickness in the type area. The aim of this study was to reevaluate the established stratigraphy defined by Gry (1969) and Gravesen et al. (1982) and characterize the three members by means of palynomorphs. 108 taxa have been recorded of which 67 are spores, 39 are pollen grains and 7 aquatic palynomorphs

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7

Renault-Miskovsky, Josette, and Michel Petzold. "Spores et pollen." Geobios 22, no. 4 (1989): 545. http://dx.doi.org/10.1016/s0016-6995(89)80109-3.

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8

Verma, Divya. "PREVALENCE OF AIRBORNE POLLEN GRAINS AND FUNGAL SPORES IN A CITY OF THAR DESERT, INDIA." Journal of Advanced Scientific Research 13, no. 08 (2022): 45–53. http://dx.doi.org/10.55218/jasr.202213808.

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Monitoring of bioaerosols i.e., pollen grains and fungal spores, was undertaken for two consecutive years in a city of Thar Desert- Bikaner, using Gravity Slide Method. A total of 32 different pollen taxa were identified with Annual Pollen Integral (API) of 890 pollen grains per sq. cm in the first year and 906 pollen grains per sq. cm in the second year. The pollen count of non-arboreal plants was much more than that of the arboreal plants. The most prominent annual average pollen percentage was credited to Poaceae (25.91%), followed by Chenopodiaceae/Amaranthaceae (17.57%), Papilionaceae (7.

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9

Katsimpris, Petros, Christos Nikolaidis, Theodora-Eleftheria Deftereou, et al. "Three-year pollen and fungi calendar in a Mediterranean region of the Northeast Greece." Allergologia et Immunopathologia 50, no. 2 (2022): 65–74. http://dx.doi.org/10.15586/aei.v50i2.491.

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Introduction and objectives: Pollen calendars have been proved clinically important in allergic disease management, as differences in airborne allergens exist not only between different countries but also between regions of the same country as well. This study aims to provide new data regarding the atmospheric pollen and fungi content of a Mediterranean region (Western Thrace/North-East Greece) and discuss seasonal trends, differences in pollen grains and fungi spores’ circulation over the years, and correlations with climate parameters. Material and methods: A 7-day continuously running volum

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10

Kasprzyk, Idalia. "Co-occurrence of airborne allergenic pollen grains and fungal spores in Rzeszów, Poland (2000-2002)." Acta Agrobotanica 61, no. 2 (2012): 65–73. http://dx.doi.org/10.5586/aa.2008.034.

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The co-occurrence of airborne allergenic pollen grains and fungal spores was estimated in Rzeszów in the years 2000-2002. The volumetric method was used in this aerobiological study. Six taxa of pollen grains and five types of fungal spores characterized by strong allergenicity and/or high concentrations in the air were analyzed. The time series of pollen grains and fungal spores were compared using PCA analysis. The periods of the greatest concentrations of tree pollen did not coincide with similar periods for herbaceous plants and fungal spores. From February to mid-March, <i>Alnus<

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