Results 41 to 50 of about 489,615 (166)

Evolutionary dynamics of olfactory receptor genes in chordates: interaction between environments and genomic contents

open access: yesHuman Genomics, 2009
Olfaction is essential for the survival of animals. Versatile odour molecules in the environment are received by olfactory receptors (ORs), which form the largest multigene family in vertebrates. Identification of the entire repertories of OR genes using
Niimura Yoshihito
doaj   +1 more source

Carbon, nitrogen, and oxygen stable isotopes in modern tooth enamel: A case study from Gorongosa National Park, central Mozambique

open access: yesFrontiers in Ecology and Evolution, 2022
The analyses of the stable isotope ratios of carbon (δ13C), nitrogen (δ15N), and oxygen (δ18O) in animal tissues are powerful tools for reconstructing the feeding behavior of individual animals and characterizing trophic interactions in food webs.
Tina Lüdecke   +41 more
doaj   +1 more source

Analisis Kebutuhan LKPD Praktikum Berbasis Inkuiri Terbimbing Berbantu Teka-teki Silang pada Materi Vertebrata untuk Peserta Didik SMA

open access: yesFondatia : Jurnal Pendidikan Dasar, 2022
The study aims to identify the needs of students for the LKPD practicum as a guide book in pratical activities. As well as addressing problems in the selection of learning media in accordance with the learning activities carried out.
Alfionita Anggraini   +3 more
doaj   +1 more source

The Natural History of Teneurins: A Billion Years of Evolution in Three Key Steps

open access: yesFrontiers in Neuroscience, 2019
The entire evolutionary history of the animal gene family, Teneurin, can be summed up in three key steps, plus three salient footnotes. In a shared ancestor of all bilaterians, the first step began with gene fusions that created a protein with an amino ...
Ron Wides
doaj   +1 more source

Context-Aware Transformers For Spinal Cancer Detection and Radiological Grading [PDF]

open access: yesarXiv, 2022
This paper proposes a novel transformer-based model architecture for medical imaging problems involving analysis of vertebrae. It considers two applications of such models in MR images: (a) detection of spinal metastases and the related conditions of vertebral fractures and metastatic cord compression, (b) radiological grading of common degenerative ...
arxiv  

Fibronectin Contributes To Notochord Intercalation In The Invertebrate Chordate, Ciona Intestinalis [PDF]

open access: yes, 2016
Background: Genomic analysis has upended chordate phylogeny, placing the tunicates as the sister group to the vertebrates. This taxonomic rearrangement raises questions about the emergence of a tunicate/vertebrate ancestor.
Cha, A.   +4 more
core   +1 more source

Microborings in mid Cretaceous fish teeth [PDF]

open access: yes, 1999
Fish teeth and other remains from the British Cretaceous contain abundant evidence for post-mortem colonization by endolithic organisms. The borings are here recognised as occurring in three morphotypes, including a flask-shaped form not previously ...
Brett   +13 more
core   +1 more source

Ontogenetic stomach development in catshark Scyliorhinus canicula.

open access: yesFrontiers in Marine Science, 2015
The gastrointestinal tract (GIT) of vertebrates develops from a simple undifferentiated tube into highly differentiated regions for the digestion and absorption of nutrients.
Odete Goncalves   +4 more
doaj   +1 more source

VertDetect: Fully End-to-End 3D Vertebral Instance Segmentation Model [PDF]

open access: yesarXiv, 2023
Vertebral detection and segmentation are critical steps for treatment planning in spine surgery and radiation therapy. Accurate identification and segmentation are complicated in imaging that does not include the full spine, in cases with variations in anatomy (T13 and/or L6 vertebrae), and in the presence of fracture or hardware.
arxiv  

Membrane Proteins Mediating Reception and Transduction in Chemosensory Neurons in Mosquitoes

open access: yesFrontiers in Physiology, 2018
Mosquitoes use chemical cues to modulate important behaviors such as feeding, mating, and egg laying. The primary chemosensory organs comprising the paired antennae, maxillary palps and labial palps are adorned with porous sensilla that house primary ...
Jackson T. Sparks   +5 more
doaj   +1 more source

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