Results 41 to 50 of about 3,006 (159)

Non-random chromosome positioning in mammalian sperm nuclei, with migration of the sex chromosomes during late spermatogenesis [PDF]

, 2005
Chromosomes are highly organized and compartmentalized in cell nuclei. The analysis of their position is a powerful way to monitor genome organization in different cell types and states.
Abeydeera, L, Bridger, JM, Foster, H, Griffin, DK   +3 more
core   +1 more source

Vivid biofluorescence discovered in the nocturnal Springhare (Pedetidae)

Scientific Reports, 2021
Biofluorescence has been detected in several nocturnal-crepuscular organisms from invertebrates to birds and mammals. Biofluorescence in mammals has been detected across the phylogeny, including the monotreme duck-billed platypus (Ornithorhyncus anatinus)
Erik R. Olson, Michaela R. Carlson, V. M. Sadagopa Ramanujam, Lindsay Sears, Sharon E. Anthony, Paula Spaeth Anich, Leigh Ramon, Alissa Hulstrand, Michaela Jurewicz, Adam S. Gunnelson, Allison M. Kohler, Jonathan G. Martin   +11 more
doaj   +1 more source

Representation results for defeasible logic [PDF]

, 2000
The importance of transformations and normal forms in logic programming, and generally in computer science, is well documented. This paper investigates transformations and normal forms in the context of Defeasible Logic, a simple but efficient formalism ...
Antoniou, G., Billington, D., Governatori, G., Maher, M. J.   +3 more
core   +7 more sources

From armadillos to sloths: Patterns and variations in xenarthran coronary anatomy

The Anatomical Record, EarlyView.
Abstract Species of the superorder Xenarthra play a vital ecological role in the Neotropics. Despite their evolutionary significance, anatomical studies on their coronary circulation remain scarce. This study investigated the coronary anatomy of 82 hearts from nine Xenarthra species across the Dasypodidae, Myrmecophagidae, and Bradypodidae.
Wilson Viotto‐Souza, André Luiz Quagliatto Santos, Marcelo Abidu‐Figueiredo, Thaís Aparecida Silva, Rodrigo Ananias Barreiros Silva, Paulo de Souza‐Junior   +5 more
wiley   +1 more source

Morphometric analysis of postnatal lung development in the gray short‐tailed opossum (Monodelphis domestica): An ultrastructural study

The Anatomical Record, EarlyView.
Abstract An ultrastructural morphometric analysis of the postnatal development of the lung in the gray short‐tailed opossum (Monodelphis domestica) has been conducted to evaluate the morphofunctional status of this poorly developed marsupial lung immediately following parturition.
Kirsten Ferner
wiley   +1 more source

The evolution of imprinting: chromosomal mapping of orthologues of mammalian imprinted domains in monotreme and marsupial mammals

BMC Evolutionary Biology, 2007
Background The evolution of genomic imprinting, the parental-origin specific expression of genes, is the subject of much debate. There are several theories to account for how the mechanism evolved including the hypothesis that it was driven by the ...
Dunham Ian, Graves Jennifer, Hore Timothy, Mungall Andrew J, Clarke Oliver, Rens Willem, Edwards Carol A, Ferguson-Smith Anne C, Ferguson-Smith Malcolm A   +8 more
doaj   +1 more source

Description of the female, nymph and larva and mitochondrial genome, and redescription of the male of Ixodes barkeri Barker, 2019 (Acari: Ixodidae), from the short-beaked echidna, Tachyglossus aculeatus, with a consideration of the most suitable subgenus for this tick

Parasites & Vectors, 2022
Background Ixodes barkeri, a tick with a distinctive ventrolateral horn-like projection on palpal segment 1, was described in 2019 from two male ticks from the Wet Tropics of Far North Queensland, Australia.
Dayana Barker, Samuel Kelava, Renfu Shao, Owen D. Seeman, Malcolm K. Jones, Ryo Nakao, Stephen C. Barker, Dmitry A. Apanaskevich   +7 more
doaj   +1 more source

Placental crises: disruptive selection and maternal under‐investment as the foundations of mammalian placental evolution and dysfunction

Biological Reviews, EarlyView.
ABSTRACT Among the vertebrates, mammals are notable for the dominance of live birth and placental nutrition. The structural diversity of the mammalian placenta is remarkable, despite sharing a single common ancestor and conserved physiological functions.
Davis Laundon, Neil J. Gostling, Ian G. Reddin, Bram G. Sengers, Pascale Chavatte‐Palmer, Rohan M. Lewis   +5 more
wiley   +1 more source

Evolution and survival on eutherian sex chromosomes. [PDF]

PLoS Genetics, 2009
Since the two eutherian sex chromosomes diverged from an ancestral autosomal pair, the X has remained relatively gene-rich, while the Y has lost most of its genes through the accumulation of deleterious mutations in nonrecombining regions.
Melissa A Wilson, Kateryna D Makova
doaj   +1 more source

A comparison of sceptical NAF-free logic programming approaches [PDF]

, 1999
Recently there has been increased interest in logic programming-based default reasoning approaches which are not using negation-as-failure in their object language.
Antoniou, Grigoris, Billington, David, Governatori, Guido, Maher, Michael J.   +3 more
core   +2 more sources