Results 121 to 130 of about 15,558,174 (350)

Hippopotamyrus ansorgii species complex in the Upper Zambezi River System with a description of a new species, H. szaboi (Mormyridae) [PDF]

open access: yes, 2004
Specimens referable to Hippopotamyrus ansorgii sampled from the Upper Zambezi River System within Caprivi (Namibia) represent a complex of three species, two of which coexist in the Upper Zambezi River, and a third that inhabits a nearby river, the ...
Kramer, Bernd   +2 more
core   +1 more source

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

open access: yesFEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

Species Recognition and Cryptic Species in the Tuber indicum Complex

open access: yesPLoS ONE, 2011
Morphological delimitation of Asian black truffles, including Tuber himalayense, T. indicum, T. sinense, T. pseudohimalayense, T. formosanum and T. pseudoexcavatum, has remained problematic and even phylogenetic analyses have been controversial. In this study, we combined five years of field investigation in China with morphological study and DNA ...
Juan Chen, Shun-Xing Guo, Pei-Gui Liu
openaire   +4 more sources

A New Argyreia Lour. (Convolvulaceae) from Northern Thailand

open access: yesTaxonomy
Argyreia elegans Traiperm, Tetsana & Chitchak, sp. nov., from northern Thailand is described and illustrated. The new species resembles A. kerrii Craib but differs in terms of having lanceolate to oblong leaves, up to two inflorescences (each bearing 1–3
Natthaphong Chitchak   +3 more
doaj   +1 more source

A step‐by‐step protocol for meiotic chromosome counts in flowering plants: A powerful and economical technique revisited

open access: yesApplications in Plant Sciences, 2020
Premise Counting chromosomes is a fundamental botanical technique, yet it is often intimidating and increasingly sidestepped. Once mastered, the basic protocol can be applied to a broad range of taxa and research questions.
Michael D. Windham   +5 more
doaj   +1 more source

Faunal Composition, Wing Polymorphism and Seasonal Abundance of Some Flea Beetles (Coleoptera: Chrysomelidae) in Southern Quebec (Canada) [PDF]

open access: yes, 2018
Chrysomelidae (51 taxa) were collected with flight intercept traps from May through October during 1987-1989, in four sites near a raspberry plantation in southern Quebec.
Levesque, Claire, Levesque, Gilles-Yvon
core   +2 more sources

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

open access: yesFEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel   +13 more
wiley   +1 more source

Ring Trials on Obsoletus Complex Species [PDF]

open access: yesRevue d’Elevage et de Médecine Vétérinaire des Pays Tropicaux, 2009
Resumen en inglès, ver archivo ...
Cetre-Sossah, Catherine   +5 more
openaire   +1 more source

Additional contribution to the bryophyte flora of Chapada Diamantina National Park, State of Bahia, Brazil [PDF]

open access: yes, 1998
This paper represents an additional contribution toward the knowledge of a bryophyte flora of Chapada Diamantina National Park in the State of Bahia, Brazil, in which are reported 27 species of mosses belonging to 22 genera and 14 families, and four ...
Bastos, Cid José Passos   +2 more
core  

Ecological spectrums of heterotrophic flagellates (protista) in water bodies of ukrainian polissya area [PDF]

open access: yes, 2010
Dependence of 26 heterotrophic flagellate species development in central part of Ukrainian Polissya area from operating pH and concentrations of dissolved organic matter and oxygen in the waters is considered.
Dovgal, I. V., Shevchuк, S. Yu
core   +1 more source

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