Results 101 to 110 of about 211,080 (309)

Phenotypic and genetic variation within the Cricotopus sylvestris species-group (Diptera, Chironomidae), across a Nearctic - Palaearctic gradient

open access: yesFauna Norvegica, 2012
Intraspecific variation sometimes obscures species boundaries and makes identification of certain Chironomidae difficult. This is true for many species in the genus Cricotopus. We used DNA barcode data and multivariate statistical analyses to investigate
Susan Gresens   +2 more
doaj   +1 more source

Four Clovis Points from San Augustine County, Texas [PDF]

open access: yes, 1993
Four surface-collected Clovis points (two complete, two fragmentary) from the northeastern valley margin of the Angelina River in San Augustine County are described.
Brown, Kenneth M.
core   +1 more source

"Two tribes": Handaxe shape variation shows distinct regional cultural groups in southeastern Britain between 424 000 and 374 000 BP

open access: yesJournal of Quaternary Science, EarlyView.
ABSTRACT This paper examines regional and chronological variations in Acheulean handaxe morphology during Marine Isotope Stage 11 (c. 425–365 ka BP) in Britain. Using a data set of 737 handaxes from 13 securely dated sites in East Anglia and the Thames Valley, we apply three‐dimensional geometric morphometric analysis to examine morphological ...
Mark White   +5 more
wiley   +1 more source

Comments on Caddo Origins in Northwest Louisiana [PDF]

open access: yes, 2009
This paper presents some of my thoughts on the issue of Caddo origins from the perspective of the Red River drainage in northwest Louisiana. These ideas were assembled prior to the Caddo discussion group meeting held in December 2008 and have been only ...
Girard, Jeffery S.
core   +1 more source

Decoupling climate and human impacts on the nitrogen cycle during the Irish Bronze Age

open access: yesJournal of Quaternary Science, EarlyView.
ABSTRACT Disentangling climate variability and human activity in past nitrogen cycling is key to understanding ecosystems. Previous studies in Ireland observed a widespread, permanent shift in terrestrial nitrogen cycling during Later Prehistory, potentially linked to intensifying land‐use.
Sarah Ferrandin   +2 more
wiley   +1 more source

Book Review: A Naturalist in Indian Territory: The Journals of S. W. Woodhouse [PDF]

open access: yes, 1994
Samuel Washington Woodhouse, a Philadelphia physician and avid ornithologist, was appointed surgeon-naturalist of two expeditions to survey the Creek-Cherokee boundary in Indian Territory.
Keener, Barbara
core   +1 more source

Late Quaternary climatic variability in the Eastern Mediterranean recorded in Hermes Cave, Corinth Rift, Greece

open access: yesJournal of Quaternary Science, EarlyView.
ABSTRACT The Greek peninsula lies at the intersection of major atmospheric circulation systems, making it a key location for reconstructing past climate variability in the Eastern Mediterranean. In this study, we present a new high‐resolution multi‐proxy speleothem record from Hermes Cave, located on the shoulder of the Corinth Rift in southern Greece.
Ch. Pennos   +10 more
wiley   +1 more source

Compound‐Specific Stable Isotope Analysis Improves the Association Between Dairy Fatty Acid Biomarkers and Dairy Intake: A Secondary Analysis

open access: yesLipids, EarlyView.
ABSTRACT Increasing evidence suggests that dairy consumption may decrease the risk of chronic diseases. However, this association remains unclear due to methodological limitations. As a part of a secondary analysis, we used compound‐specific stable isotope analysis to increase the accuracy of the dairy FA biomarkers (15:0, 17:0), considering that each ...
Camilla Parzanini   +8 more
wiley   +1 more source

Contrasting patterns of prehistoric human diet and subsistence in northernmost Europe

open access: yesScientific Reports, 2018
Current archaeological evidence indicates the transition from hunting-fishing-gathering to agriculture in Northern Europe was a gradual process. This transition was especially complex in the prehistoric North Fennoscandian landscape where the high ...
Mirva Pääkkönen   +4 more
doaj   +1 more source

Anaerobic Corrosion Phenomena of Cast Iron and Copper in Artificial Groundwater at Elevated Temperature

open access: yesMaterials and Corrosion, EarlyView.
This study examines corrosion of copper and cast iron as candidate canister materials for high‐level radioactive waste disposal in contact with bentonite suspension. The influence of three electrolyte compositions on corrosion behavior under repository‐relevant conditions is assessed.
Louisa Panjiyar   +2 more
wiley   +1 more source

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