Results 31 to 40 of about 720,445 (294)

Observations and modelling of birch pollen emission and dispersion from an isolated source [PDF]

, 2014
The occurrence of allergic diseases in western countries increased during the last decades due to greater awareness towards a hygienic lifestyle. The hygiene hypothesis relates the reduced expo- sure to microbial pollution to an underdevelopment of the
Michel, Dominik
core   +1 more source

Fullerene-based symmetry in Hibiscus rosa-sinensis pollen. [PDF]

PLoS ONE, 2014
The fullerene molecule belongs to the so-called super materials. The compound is interesting due to its spherical configuration where atoms occupy positions forming a mechanically stable structure.
Kleber Andrade, Sara Guerra, Alexis Debut   +2 more
doaj   +1 more source

Structure and Function of a Multi‐Megadalton Virus‐Like Proteolytic Dodecahedron

Angewandte Chemie, EarlyView.
Zuzalysin, a virulence metallopeptidase of the periodontal pathogen Porphyromonas gingivalis, is secreted as a latent, flexible ≈95‐kDa monomer. Calcium triggers cysteine‐switch activation and hierarchical assembly into pentamers, bipentamers, tripentamers, and a ≈5.6‐MDa, ≈355‐Å dodecahedron. Structures at 1.8–3.6 Å reveal a virus‐sized catalytic cage
Mariusz Madej, Arturo Rodríguez‐Banqueri, Danuta Mizgalska, Borys Szmigielski, Zuzanna Nowakowska, Małgorzata Benedyk‐Machaczka, Monika Bzowska, Katarzyna Mikruta, Juan Sebastián Ramírez‐Larrota, Chinanu Agunanne, Olivier Julien, Anthony J. O'Donoghue, Carsten Scavenius, Mario López‐Martín, Enrique Marcos, Łukasz Koziej, Sebastian Glatt, Pablo Guerra, Ulrich Eckhard, Jan Potempa, F. Xavier Gomis‐Rüth   +20 more
wiley   +2 more sources

Contribution of pollen to atmospheric ice nuclei concentrations [PDF]

Atmospheric Chemistry and Physics, 2014
Recent studies have suggested that the ice-nucleating ability of some types of pollen is derived from non-proteinaceous macromolecules. These macromolecules may become dispersed by the rupturing of the pollen grain during wetting and drying cycles in the
J. D. Hader, T. P. Wright, M. D. Petters
doaj   +1 more source

In vitro germination and viability of pollen grain of coconut accessions1

Revista Ciência Agronômica
Storage as a means of maintaining the pollen viability is important for the preservation of the genetic variability, facilitates the exchange of germplasm and greatly contributes to the generation of variability obtained from artificial crosses ...
Catrine Regina Feitosa Moura, Caroline de Araújo Machado, Ana da Silva Lédo   +2 more
doaj   +1 more source

The effects of nucleotype and genotype upon pollen grain development in Hyacinth and Scilla

, 1982
In pollen grains within anthers of a triploid Hyacinthus orientalis the average duration of the mitotic cycle and the average size of pollen grains are directly proportional to the nuclear DNA amount. The average length of chromosomes at metaphase of the
Rees, H., Karp, A., Jewell, A. W.
core   +1 more source

Artificial intelligence-based classification of pollen grains using attention-guided pollen features aggregation network

Journal of King Saud University: Computer and Information Sciences, 2023
Visual classification of pollen grains is crucial for various agricultural applications, particularly for the protection, monitoring, and tracking of flora to preserve the biome and maintain the quality of honey-based products.
Tahir Mahmood, Jiho Choi, Kang Ryoung Park   +2 more
doaj   +1 more source

Effects of Drought Stress on Pollen Sterility, Grain Yield, Abscisic Acid and Protective Enzymes in Two Winter Wheat Cultivars

Frontiers in Plant Science, 2017
Drought stress induced pollen sterility is a detrimental factor reducing grain number in wheat. Exploring the mechanisms underlying pollen fertility under drought conditions could assist breeding high-yielding wheat cultivars with stress tolerance. Here,
Baodi Dong, Xin Zheng, Haipei Liu, Jason A. Able, Hong Yang, Huan Zhao, Mingming Zhang, Yunzhou Qiao, Yakai Wang, Mengyu Liu   +9 more
doaj   +1 more source

The Pollen Grain

Botanical Gazette, 1897
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
openaire   +3 more sources

Effects of Alternaria alternata f.sp. lycopersici toxins on pollen [PDF]

, 1988
Effects of the phytotoxic compounds (AAL-toxins) isolated from cell-free culture filtrates of Alternaria alternata f.sp. lycopersici on in vitro pollen development were studied. AAL-toxins inhibited both germination and tube growth of pollen from several
Franken, J., Franken, J.,, Witsenboer, H.M.A.,, Witsenboer, H.M.A., Bino, R.J.,, Hille, J., Dons, J.J.M.,, Hille, J.,, Bino, R.J., Dons, J.J.M.   +9 more
core   +2 more sources