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Showing 1 to 12 of 8296 entries
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Records of Late Pleistocene–Holocene climatic change in Mexico—a review

Cultural Transformation in the Geoscience Community AND Program Evaluation

[No authors listed]
GSID: bIpX6t9feP0J
SE Metcalfe, SL O'Hara, M Caballero… - Quaternary Science …, 2000 - Elsevier

Here we review palaeoclimatic records from Mexico which have a reasonable chronological framework and are readily accessible. Reconstructions are based on pollen, diatoms, sediment chemistry and isotopes, packrat middens and glacial records and are discussed within the context of...

Transforming Content Knowledge: Learning to Teach about Isotopes

Science education

[No authors listed]
GSID: 5IZE3jPeYLQJ
AN Geddis - Science education, 1993 - ERIC

Presents a vignette about Karen, a student teacher in her first attempt at teaching chemical isotopes. Karen focuses on transmitting what she knows. An overview of Schulman's conceptions of pedagogical content knowledge is then provided. Shulman's ideas are employed...

Evaluating natural and anthropogenic trace element inputs along an alpine to urban gradient in the Provo River, Utah, USA

EPSCoR Research Infrastructure Improvement Program AND Program Evaluation

Carling GT, Fernandez DP, Nelson ST.
GSID: QMd9rIXOmMQJ
GT Carling, DG Tingey, DP Fernandez, ST Nelson… - Applied …, 2015 - Elsevier

Numerous natural and anthropogenic processes in a watershed produce the geochemical composition of a river, which can be altered over time by snowmelt and rainfall events and by built infrastructure (ie, dams and diversions). Trace element concentrations coupled with...

MRI: Acquisition of a Customized GC-IRMS for Isotopic Analysis of Nitrate and Nitrous Oxide at URI

EPSCoR Research Infrastructure Improvement Program AND Program Evaluation

Robinson R.
GSID: 6ZDov6mUQ9MJ
R Robinson - 2019 - resp.llas.ac.cn

英文摘要 The instrumentation project focuses on the purchase of an isotope ratio mass spectrometer with a gas chromatographic front end. Specifically the proposal request will customize a new gas source isotope ratio mass spectrometer with a gas chromatographic inlet...

Soil water vapour isotopes identify missing water source for streamside trees

EPSCoR Research Infrastructure Improvement Program AND Program Evaluation

Bowen G, Bowling DR, Oerter EJ.
GSID: -emAxfG1rNYJ
EJ Oerter, G Siebert, DR Bowling, G Bowen - Ecohydrology, 2019 - Wiley Online Library

In a seminal study, Dawson and Ehleringer used deuterium measurements on water to show that boxelder (Acer negundo) and bigtooth maple (Acer grandidentatum) trees growing directly next to a perennial stream in a mountain meadow did not use the...

Late Quaternary environmental change inferred from phytoliths and other soil-related proxies: case studies from the central and southern Great Plains, USA

EPSCoR Research Infrastructure Improvement Program AND Program Evaluation

Cordova CE, Johnson WC, Mandel RD, Palmer MW.
GSID: i8MEF-hnYcEJ
CE Cordova, WC Johnson, RD Mandel, MW Palmer - Catena, 2011 - Elsevier

This study investigates stable carbon isotopes (δ 13 C), opal phytolith assemblages, burnt phytoliths, microscopic charcoal and Sporormiella spores from modern soils and paleosols in Kansas and Oklahoma. Grass and dicot phytoliths in combination with δ 13 C are...

Membrane inlet laser spectroscopy to measure H and O stable isotope compositions of soil and sediment pore water with high sample throughput

EPSCoR Research Infrastructure Improvement Program AND Program Evaluation

Oerter EJ, Pardyjak E, Perelet A.
GSID: M93VooPLSc0J
EJ Oerter, A Perelet, E Pardyjak… - … in Mass Spectrometry, 2017 - Wiley Online Library

Rationale The fast and accurate measurement of H and O stable isotope compositions (δ2H and δ18O values) of soil and sediment pore water remains an impediment to scaling‐up the application of these isotopes in soil and vadose hydrology. Here...

An overview of causes for stable isotopic variations in past European human populations: environmental, ecophysiological, and cultural effects

Cultural Transformation in the Geoscience Community AND Program Evaluation

Richards MP.
GSID: m--HkTO6uikJ
GJV Klinken, MP Richards, BEM Hedges - Biogeochemical approaches to …, 2002 - Springer

The reconstruction of ancient human diet based on carbon and nitrogen analysis has proved to be relatively simple in the New World: utilization of C 4 and marine resources causes relatively large shifts in these stable isotopes. In Europe...

Berkeley Laboratory Isotopes Project's Exploring the Table of Isotopes

field stations

Firestone RB.
GSID: EI9j_qH0yo8J
RB Firestone - 2000 - jbc.bj.uj.edu.pl

Prezentowany opis stanowi element sporządzonej na podstawie analizy krajowych i zagranicznych zasobów cyfrowych bazy wiedzy rejestrującej internetowe źródła informacji z …

Solvent states and spectroscopy of doped helium clusters as a quantum-chemistry-like problem.

Physical chemistry chemical physics : PCCP

Aguirre NF, Villarreal P, Delgado-Barrio G, Mitrushchenkov AO, de Lara-Castells MP.
PMID: 23595125
Phys Chem Chem Phys. 2013 Jul 07;15(25):10126-40. doi: 10.1039/c3cp50282a. Epub 2013 Apr 18.

The Full-Configuration-Interaction Nuclear-Orbital (FCI-NO) approach [J. Chem. Phys., 2009, 131, 19401], as the implementation of the quantum-chemistry ansatz, is overviewed and applied to (He)N-Cl2(X) clusters (N≤ 4). The ground and excited states of both fermionic (3)He and bosonic (4)He...

New analytical approach to calibrate the co-axial HPGe detectors including correction for source matrix self-attenuation.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

Badawi MS, Gouda MM, Nafee SS, El-Khatib AM, El-Mallah EA.
PMID: 23023386
Appl Radiat Isot. 2012 Dec;70(12):2661-8. doi: 10.1016/j.apradiso.2012.08.014. Epub 2012 Aug 31.

To calibrate the co-axial HPGe semiconductor detectors, we introduce a new theoretical approach based on the Direct Statistical method proposed by Selim and Abbas (1995, 1996) to calculate the full-energy peak efficiency for cylindrical detectors. The present method depends...

Protocol: a beginner's guide to the analysis of RNA-directed DNA methylation in plants.

Plant methods

Zhang H, Tang K, Wang B, Duan CG, Lang Z, Zhu JK.
PMID: 24955108
Plant Methods. 2014 Jun 14;10:18. doi: 10.1186/1746-4811-10-18. eCollection 2014.

BACKGROUND: DNA methylation is a conserved epigenetic mark that controls genome stability, development and environmental responses in many eukaryotes. DNA methylation can be guided by non-coding RNAs that include small interfering RNAs and scaffold RNAs. Although measurement of DNA...

Showing 1 to 12 of 8296 entries