Results 121 to 130 of about 6,013 (277)

Body Size Regulates Niche Overlap Asymmetry in the Subtropical Andes Rain Shadow: Isotopic Paleoecology of Oligocene South American Ungulates

Integrative Zoology, EarlyView.
This study provides the first isotopic analysis of Oligocene mammals from Quebrada Fiera, Mendoza, Argentina, filling a major gap in South American paleontology. It reveals a latitudinal gradient in aridity due to the Andean rain shadow and highlights the role of (semi)permanent water bodies in sustaining diverse herbivore communities. Additionally, it
Dánae Sanz‐Pérez, Santiago Hernández Del Pino, Esperanza Cerdeño, Manuel Hernández Fernández, Laura Domingo   +4 more
wiley   +1 more source

Halogenated heteroanionic strontrium apatites

, 2013
Some halogenated derivatives of arsenate and vanadate-strontium apatites are studied by i.r. spectroscopy. The results seem to support the ionic migration mechanism suggested elsewhere. © 1982.The authors thank C. SIGÚENZA and T.
Sanz-Pinilla, S., Otero-Aenlle, E., González-Díaz, Pedro F., Galera-Gómez, P.   +3 more
core  

Investigating relationships among strontium, barium, and seasonality in wild baboons

Archaeometry, EarlyView.
Abstract Geochemical profiles of Australopithecus africanus and baboon teeth show fluctuating trace elements, possibly reflecting seasonal diets. Here we use laser ablation–inductively coupled plasma–mass spectrometric measurements of calcium‐normalized strontium and barium ratios (Sr/Ca and Ba/Ca) and ion microprobe analyses of oxygen isotopes (δ18O ...
Maya Bharatiya, Christine Austin, Manish Arora, Janaína N. Ávila, Esme K. Beamish, Wendy Dirks, Daniel R. Green, Nicole D. Leonard, W. Scott McGraw, Larissa Swedell, Ian S. Williams, Jian‐xin Zhao, Tanya M. Smith   +12 more
wiley   +1 more source

Evaluation of the Rb/Sr ratio as an indicator of chemical weathering: a case study from five sedimentary sections in Northeast China

Boreas, EarlyView.
Chemical weathering plays a pivotal role in the Earth's surface material cycle and global climate regulation. It not only facilitates the reconstruction of palaeoclimate characteristics but also provides essential insights into Earth's evolutionary history.
Zhenyu Wei, Yuanyun Xie, Jie Meng, Lei Sun, Chunguo Kang, Yunping Chi, Peng Wu, Haijin Liu, Ruonan Liu, Ruitong Chang   +9 more
wiley   +1 more source

Ecological variability of Hippopotamus antiquus from the late Early–Middle Pleistocene of Megalopolis Basin (Greece): Evidence for dynamic habitats in a glacial microrefugium

Boreas, EarlyView.
This study investigates the ecology of the extinct European Hippopotamus from the late Early–Middle Pleistocene (c. 900–400 ka) sequence of the Megalopolis Basin, a glacial microrefugium for temperate taxa in southern Greece. Using stable carbon (δ13C) and oxygen (δ18O) isotope analyses and microwear analyses of Hippopotamus dental elements, we ...
Effrosyni Roditi, Gabriele Russo, Hervé Bocherens, George E. Konidaris, Athanassios Athanassiou, Florent Rivals, Vangelis Tourloukis, Eleni Panagopoulou, Panagiotis Karkanas, Katerina Harvati   +9 more
wiley   +1 more source

Influence of rubbing during etching on surface roughness and interfacial characteristics of intact enamel

European Journal of Oral Sciences, EarlyView.
Abstract Rubbing phosphoric acid during etching has been shown to improve surface roughness in prepared enamel. This study aimed to compare intact enamel's surface roughness and resin tag lengths after etching with and without rubbing. Extracted sound third molars were used for testing, mesially for conventional and distally for dynamic (rubbing ...
Moana Biedermann, Iosif Sifakakis, Spiros Zinelis, George Eliades, Theodore Eliades, Raphael Patcas   +5 more
wiley   +1 more source

Effect of Solution Composition on Morphological and Structural Features of Carbonated Calcium Apatites

, 1990
The composition of enamel mineral corresponds to that of a calcium carbonato-apatite. For insight to be gained into the precipitation of carbonato-apatites having specific properties (crystal size, morphology, and carbonate incorporation into the ...
E.C. Moreno, Y. Miake, S. Shimoda, T. Aoba   +3 more
core   +1 more source

Graphene oxide–modified fluoridated varnish promotes mineral recovery in demineralized bovine enamel: An in vitro study

European Journal of Oral Sciences, EarlyView.
Abstract This in vitro study evaluated the efficacy of an experimental fluoridated varnish modified with graphene oxide (GO) nanoparticles in arresting initial caries lesion progression and promoting mineral recovery in demineralized bovine enamel.
Mariana Souza Rodrigues, Guilherme José Drigo, Sofia Furlanete Raymundo, Nair Cristina Brondino, Salvatore Sauro, Marilia Mattar de Amoêdo Campos Velo   +5 more
wiley   +1 more source

Influence of carbonate apatite nanoparticles incorporated into commercial dental adhesives on immediate and long‐term microtensile bond strength

European Journal of Oral Sciences, EarlyView.
Abstract This study assessed whether integrating carbonate apatite nanoparticles with a CO3/PO4 molar ratio of 5 (CA5n) into commercial adhesives affected the immediate or the long‐term microtensile bond strength (µTBS) between composite resin and dentin.
Heba E. AbdelRazik, Jon E. Dahl, Mina Aker Sagen   +2 more
wiley   +1 more source

The Laser-Raman Spectroscopic Studies on Human Enamel and Precipitated Carbonate-containing Apatites

, 1981
Laser-Raman spectra of synthetic apatites containing from zero to 12.4 wt% carbonate ions and enamel apatite are reported. Special attention is paid to the correlation between the intensities of the carbonate, phosphate, and hydroxyl modes and the ...
Yutaka Moriwaki, Masayuki Okazaki, Mizuho Nishino, Shinsuke Yamashita, Takaaki Aoba   +4 more
core   +1 more source