Results 21 to 30 of about 182,251 (343)

New postcranial remains of large toxodontian notoungulates from the late Oligocene of Mendoza, Argentina and their systematic implications [PDF]

open access: yesActa Palaeontologica Polonica, 2017
During the last decade, the Deseadan (late Oligocene) Quebrada Fiera locality, Mendoza Province, Argentina, has provided a large amount of mammal remains.
Santiago Hernández Del Pino   +2 more
doaj   +1 more source

Recent Advances and Challenges in Emerging Power Systems

open access: yesInventions
Diminishing fossil fuels, the continually increasing demand for energy due to rapid urbanization, pollution caused by the increased generation of electricity using fossil fuels, the consequent environmental effect, and concerns about man-made global ...
Om P. Malik
doaj   +1 more source

RESOLVING THE ANATOMY OF MATURE SCLERIFIED CONIFER SEED CONES: COMPLEMENTARITY AMONG THREE METHODS

open access: yesPublicación Electrónica de la Asociación Paleontológica Argentina, 2022
Phylogenetic studies of conifers that involve morphology are hindered by gaps in the anatomical characterization of seed cones, a direct result of difficulties encountered in sectioning cones in mature stages, which are often hardened due to ...
Samar Riad El-Abdallah   +4 more
doaj   +1 more source

The Mayer-Eymar collection of Cenozoic mollusks

open access: yesSwiss Journal of Palaeontology, 2022
Karl Mayer (later Karl Mayer-Eymar, 1826–1906) was a stratigrapher and palaeontologist who assembled during his long career a collection of Cenozoic (then “Tertiary”) mollusks that numbers more than 500′000 specimens.
Walter Etter
doaj   +1 more source

Mercury in the environment [PDF]

open access: yes, 1972
Problems in assessing mercury concentrations in environmental materials are discussed. Data for situations involving air, water, rocks, soils, sediments, sludges, fossil fuels, plants, animals, foods, and man are drawn together and briefly evaluated ...
Fulkerson, W.   +3 more
core   +1 more source

Enzymatic degradation of biopolymers in amorphous and molten states: mechanisms and applications

open access: yesFEBS Open Bio, EarlyView.
This review explains how polymer morphology and thermal state shape enzymatic degradation pathways, comparing amorphous and molten biopolymer structures. By integrating structure–reactivity principles with insights from thermodynamics and enzyme engineering, it highlights mechanisms that enable efficient polymer breakdown.
Anđela Pustak, Aleksandra Maršavelski
wiley   +1 more source

The effectiveness of using carbonate isotope measurements of body tissues to infer diet in human evolution: Evidence from wild western chimpanzees (Pan troglodytes verus)* [PDF]

open access: yes, 2015
Changes in diet throughout hominin evolution have been linked with important evolutionary changes. Stable carbon isotope analysis of inorganic apatite carbonate is the main isotopic method used to reconstruct fossil hominin diets; to test its ...
Boesch, Christophe   +3 more
core   +1 more source

Understanding bio‐based polymers: A study of origins, properties, biodegradation and their impact on health and the environment

open access: yesFEBS Open Bio, EarlyView.
This review provides an overview of bio‐based polymer sources, their unique functional properties and their environmental impact, and addresses their role as sustainable alternatives. It discusses end‐of‐life options, including composting and anaerobic digestion for renewable energy.
Sabina Kolbl Repinc   +8 more
wiley   +1 more source

Libro de Resúmenes de las XXXVII Jornadas Argentinas de Paleontología de Vertebrados

open access: yesPublicación Electrónica de la Asociación Paleontológica Argentina
Libro de resúmenesde las XXXVII Jornadas Argentinas de Paleontología de Vertebrados, que tuvo lugar en la Ciudad de Corrientes (Corrientes, Argentina) del 14 al 17 de Mayo de 2024.
Comité Organizador de las XXXVII JAPV
doaj   +1 more source

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