Results 41 to 50 of about 5,630 (216)

Confirmação da relação entre peixes-bois, "hyraxes" e elefantes, por meio do estudo da proteína das lentes dos olhos () [PDF]

Acta Amazonica, 1980
Resumo As relações filogenéticas entre os membros da super-ordem Paenungulata, os peixes-bois, elefantes e "hyraxes", foram investigadas, utilizando-se a seqüência de análises de aminoácidos da proteína oc A do cristalino da lente dos olhos destes ...
W. W. de Jong, A. Zweers
doaj   +1 more source

Revisiting proboscidean phylogeny and evolution through total evidence and palaeogenetic analyses including Notiomastodon ancient DNA

iScience, 2022
Summary: The extinct Gomphotheriidae is the only proboscidean family that colonized South America. The phylogenetic position of the endemic taxa has been through several revisions using morphological comparisons.
Sina Baleka, Luciano Varela, P. Sebastián Tambusso, Johanna L.A. Paijmans, Dimila Mothé, Thomas W. Stafford, Jr., Richard A. Fariña, Michael Hofreiter   +7 more
doaj   +1 more source

The Hazen Mammoth (Mammuthus columbi), Prairie County, Arkansas [PDF]

, 1974
In May 1965, mammoth remains were exposed during the excavation of a borrow pit for construction of Interstate Highway 40, 2 mi northeast of Hazen, Prairie County, Arkansas.
Puckette, William L., Scholtz, James A.
core   +2 more sources

Frost Tolerance Increases With Plant Height Among Co‐Occurring Alpine Species in the Central Tibetan Plateau

Ecology and Evolution, Volume 16, Issue 5, May 2026.
Frost tolerance (LT50) varies greatly among species coexisting in an alpine community. Taller plants are more frost‐tolerant, reversing the expected intra‐community pattern. Evidence for a frost survival trade‐off: avoidance in short plants vs. tolerance in tall plants.
Ji Suonan, Xuwei Lu, Richard Michalet, Pierre Liancourt, Aimée T. Classen, Wenying Wang, Huichun Xie   +6 more
wiley   +1 more source

Criptógamos do Parque Estadual das Fontes do Ipiranga, São Paulo, SP. Algae, 44: Bacillariophyceae (Surirellales: Epithemia)

Hoehnea
RESUMO Foi realizado um levantamento florístico de Epithemia (Bacillariophyceae) na área do Parque Estadual das Fontes do Ipiranga (PEFI), São Paulo, SP, Brasil, com o objetivo de conhecer a diversidade taxonômica e a variabilidade morfológica do gênero.
Krysna Stephanny de Morais, Simone Alves de Oliveira, Elton Augusto Lehmkuhl, Angela Maria da Silva-Lehmkuhl, Carlos Eduardo de Mattos Bicudo   +4 more
doaj   +1 more source

The accelerating influence of humans on mammalian macroecological patterns over the late Quaternary [PDF]

, 2019
The transition of hominins to a largely meat-based diet ~1.8 million years ago led to the exploitation of other mammals for food and resources. As hominins, particularly archaic and modern humans, became increasingly abundant and dispersed across the ...
Elliott Smith, Rosemary E., Lyons, S. Kathleen, Payne, Jonathan L., Smith, Felisa A., Villaseñor, Amelia   +4 more
core   +1 more source

Sea Surface Temperature and Salinity Changes in the Easternmost Mediterranean During the Pre‐Evaporitic Messinian Controlled by the Restriction at Gibraltar

Paleoceanography and Paleoclimatology, Volume 41, Issue 1, January 2026.
Abstract During the latest Miocene, the Mediterranean Basin was affected by extreme paleoceanographic and paleoenvironmental changes culminating with evaporite (gypsum and halite) formation during the Messinian Salinity Crisis (MSC: 5.97–5.33 Ma).
F. Lanterna, W. Krijgsman, L. Lourens, A. Mulch, I. Vasiliev   +4 more
wiley   +1 more source

(−)-6-epi-Artemisinin, a Natural Stereoisomer of (+)-Artemisinin in the Opposite Enantiomeric Series, from the Endemic Madagascar Plant Saldinia proboscidea, an Atypical Source

Molecules, 2021
Chemical and biological investigation of the Madagascar endemic plant Saldinia proboscidea led to the isolation of an isomer of artemisinin, (−)-6-epi-artemisinin (2). Its structure was elucidated using a combination of NMR and mass spectrometry.
Saholinirina Randrianarivo, Claudine Rasolohery, Sitraka Rafanomezantsoa, Heriniaina Randriamampionona, Liti Haramaty, Roger Marie Rafanomezantsoa, Eric H. Andrianasolo   +6 more
doaj   +1 more source

Re-evaluation of mastodon material from Oregon and Washington, USA, Alberta, Canada, and Hidalgo and Jalisco, Mexico [PDF]

PeerJ
The presence of at least two contemporaneous Pleistocene mastodon taxa in North America (Mammut americanum and M. pacificus) invites re-examination of specimens at the geographic margins of each species in order to determine range boundaries, overlaps ...
Alton C. Dooley Jr, Chris Widga, Brittney E. Stoneburg, Christopher Jass, Victor M. Bravo-Cuevas, Andrew Boehm, Eric Scott, Andrew T. McDonald, Mark Volmut   +8 more
doaj   +2 more sources

Hypercanines: Not just for sabertooths

The Anatomical Record, Volume 308, Issue 11, Page 2831-2842, November 2025.
Abstract Hypercanines are here defined as hypertrophied caniniform teeth, that is, canine teeth that are elongated to serve specific functions in different clades of mammals and their synapsid ancestors. This article presents an overview of the occurrence of hypercanines, their growth, and their function across a broad range of clades.
Lars Werdelin
wiley   +1 more source