Results 41 to 50 of about 891 (176)

Laminar shell structure of Antigonambonites planus (Pander, 1830) (Brachiopoda, Billingsellida) [PDF]

Estonian Journal of Earth Sciences, 2017
The order Billingsellida comprises brachiopods with laminar and fibrous shells, however, the data on their microstructure are scanty and the taxonomic value of differences in their shell structure is uncertain.
Anna Madison
doaj   +1 more source

Structural Basis of GABAB Receptor Activation during Evolution

Advanced Science, Volume 12, Issue 37, October 6, 2025.
This study explores the structural and functional mechanisms of the drosophila GABAB receptor, a key role in neurotransmission. Using cryo‐EM, the research reveals how the receptor's activation differs from its human counterpart, highlighting unique evolutionary features.
Guofei Hou, Shenglan Zhang, Cangsong Shen, Suyu Ji, Binqian Zou, Chanjuan Xu, Liang Li, Dandan Shen, Jiayin Liang, Haidi Chen, Philippe Rondard, Cheng Deng, Jun He, Yan Zhang, Jianfeng Liu   +14 more
wiley   +1 more source

Testing the core–periphery hypothesis: a standardised multi‐phylum assessment of genetic diversity of marine coastal species

Ecography, Volume 2025, Issue 10, October 2025.
The core–periphery hypothesis (CPH) predicts that genetic diversity is greatest at the centre and lowest at the edges of a species' distribution because genetic diversity is a function of a species' abundance, which is also expected to be greatest at the centre and lowest at the edges of the distribution. Variants of the CPH include the ‘Ramped North' (
Daniel Cárcamo, Mailiu Díaz Peña, Jonathan P. A. Gardner   +2 more
wiley   +1 more source

Taxon‐specific BLAST percent identity thresholds for identification of unknown sequences using metabarcoding

Methods in Ecology and Evolution, Volume 16, Issue 10, Page 2380-2394, October 2025.
Abstract The identification of organisms in environmental samples using metabarcoding relies on factors such as taxonomic assignment methods, genetic markers, reference databases and confidence thresholds for taxonomic assignment. Because lineages evolve at different rates, a global threshold (e.g.
Paula Pappalardo, Jan M. Hemmi, Ryuji J. Machida, Matthieu Leray, Allen G. Collins, Karen J. Osborn   +5 more
wiley   +1 more source

PHOTOGRAPHY: A CONVENIENT TECHNIQUE FOR RECORDING SERIAL TRANSVERSE SECTIONS OF BRACHIOPODS

Rivista Italiana di Paleontologia e Stratigrafia, 2017
A review of the bibliography coupled with the Authors' personal experience shows that drawing, as a technique for recording serial transverse sections of Brachiopods is inadequate and inaccurate.
CHIARA BENIGNI, CARLA FERLIGA
doaj   +1 more source

The loss of the urea cycle and ornithine metabolism in different insect orders: An omics approach

Insect Molecular Biology, Volume 34, Issue 5, Page 632-644, October 2025.
Among urea cycle enzymes, only the nitric oxide synthase gene is universally present across insect genomes. All Hemiptera species lack the enzymes needed to convert citrulline to arginine, and some also lack the pathway from arginine to ornithine. Putrescine and spermidine synthesis is conserved in all insects, but aphids lack the capability to produce
Jessica Cristina Silva Martins, Héctor Antônio Assunção Romão, Carolina Kurotusch Canettieri, Amanda Caetano Cercilian, Patrícia Rasteiro Ordiale Oliveira, Clelia Ferreira, Walter R. Terra, Renata de Oliveira Dias   +7 more
wiley   +1 more source

Biofouling reduction by lantern nets exchange and its relationship with production and survival of Argopecten purpuratus in Samanco Bay, Peru

Journal of the World Aquaculture Society, Volume 56, Issue 5, October 2025.
Abstract The aquaculture of Argopecten purpuratus (Peruvian scallop) is a profitable activity with positive impacts on the local economy. However, the development of biofouling on the culture lantern nets generates negative environmental impacts that affect its sustainability.
Rómulo E. Loayza‐Aguilar, Guillermo B. Saldaña‐Rojas, Fernando Merino, Gustavo E. Olivos‐Ramirez   +3 more
wiley   +1 more source

Biostratigraphy and correlation of the Cambrian Series 2 (Stage 4) to Miaolingian (Wuliuan) Thorntonia Limestone, south‐eastern Georgina Basin (Queensland, Australia)

Papers in Palaeontology, Volume 11, Issue 5, September/October 2025.
Abstract The Australian Cambrian stratigraphic record is one of the most complete for any continent. However, there is a general division, with older Cambrian rocks in South Australia (predominantly Terreneuvian, Stage 2 to Miaolingian, Wuliuan) and younger rocks in northern Australia (mostly latest Series 2, Stage 4 and younger), with minimal ...
Marissa J. Betts, Patrick M. Smith, John R. Paterson, Evelyn M. Mervine, Daniel A. Stirling, James D. Holmes   +5 more
wiley   +1 more source

Between the Poles: Rethinking Global Patterns in Sea Anemone Biodiversity

Journal of Biogeography, Volume 52, Issue 8, August 2025.
ABSTRACT Aim To assess global sampling coverage of sea anemones and global species richness across four different spatial resolutions, and analyse these along latitudinal gradients to investigate true bimodality and the extent to which these patterns have been influenced by uneven sampling efforts. Location The study encompasses a global scale.
Charlotte Benedict, Michael Broe, Marymegan Daly, Maanas Nukala   +3 more
wiley   +1 more source

Development of the Brachiopoda [PDF]

American Journal of Science, 1891
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openaire   +2 more sources