Results 101 to 110 of about 1,321 (169)

Britain's oldest agnathans [PDF]

open access: yesGeological Magazine, 1975
R.J. Aldridge, Susan Turner
openaire   +1 more source

Fin modules: an evolutionary perspective on appendage disparity in basal vertebrates

open access: yesBMC Biology, 2017
Background Fishes are extremely speciose and also highly disparate in their fin configurations, more specifically in the number of fins present as well as their structure, shape, and size.
Olivier Larouche   +2 more
doaj   +1 more source

Genome-wide microRNA screening in Nile tilapia reveals pervasive isomiRs’ transcription, sex-biased arm switching and increasing complexity of expression throughout development [PDF]

open access: yes, 2018
MicroRNAs (miRNAs) are key regulators of gene expression in multicellular organisms. The elucidation of miRNA function and evolution depends on the identification and characterization of miRNA repertoire of strategic organisms, as the fast-evolving ...
A Brummer   +81 more
core   +2 more sources

Functional constraints in the evolution of brain circuits [PDF]

open access: yes, 2015
Regardless of major anatomical and neurodevelopmental differences, the vertebrate isocortex shows a remarkably well-conserved organization. In the isocortex, reciprocal connections between excitatory and inhibitory neurons are distributed across multiple
Conrado A. Bosman, Francisco Aboitiz
core   +1 more source

Agnathan VIP, PACAP and Their Receptors: Ancestral Origins of Today's Highly Diversified Forms

open access: yesPLoS ONE, 2012
VIP and PACAP are pleiotropic peptides belonging to the secretin superfamily of brain-gut peptides and interact specifically with three receptors (VPAC(1), PAC(1) and VPAC(2)) from the class II B G protein-coupled receptor family. There is immense interest regarding their molecular evolution which is often described closely alongside gene and/or genome
Lee, LTO   +4 more
openaire   +7 more sources

The morphology and sculpture of ossicles in the Cottidae (Teleostei) of the Baltic Sea [PDF]

open access: yes, 2010
Small to very small ossified structures (ossicles) such as cephalic horns, dermal tubercles, fin-ray rods, lateral-line canal segments, branchial tooth plates and gill-raker tubercles of three species of the teleostean fish family Cottidae inhabiting the
Heli Špilev   +4 more
core   +1 more source

Late Devonian (Famennian) jaws: the icriodid multielement apparatus and its function [PDF]

open access: yes, 2001
In this study the conodont multielement apparatus of Late Devonian (Famennian) Icriodus altematus is described which has been reconstructed from clustered group findings and separated elements.
Schülke, Immo
core   +2 more sources

A SINE in the genome of the cephalochordate amphioxus is an Alu element

open access: yesInternational Journal of Biological Sciences, 2006
Transposable elements of about 300 bp, termed “short interspersed nucleotide elements or SINEs are common in eukaryotes. However, Alu elements, SINEs containing restriction sites for the AluI enzyme, have been known only from primates.
doaj  

Karyotype analysis of chub, Squalius cephalus (Linnaeus, 1758) (Teleostei: Cyprinidae) from Karasu River, Erzurum, Turkey [PDF]

open access: yes, 2016
The karyotypic characteristics of chub, Squalius cephalus have been investigated by examining metaphase chromosomes spreads obtained from gill and kidney tissues. The fish used in the study were caught with fishing nets from Dumlu Stream, one of the main
Kilic, D., Sisman, T.
core   +1 more source

The species composition and nutrition of dominant species of fish of Absheron Gulfs of the Caspian Sea [PDF]

open access: yes, 2015
The analysis of net catches made in Absheron Gulfs of the Caspian Sea during 2011-2012 is provided. The ichthyofauna of Absheron Gulfs, including 26 species found in the North Gulf, and 33 species and subspecies found in the South Gulf was studied for ...
Azizov, A.P.   +2 more
core  

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