Results 121 to 130 of about 116,124 (306)

ANÁLISIS FORENSE DE MUESTRAS DE COCAÍNA PRODUCIDAS EN COLOMBIA: I. PERFIL CROMATOGRÁFICO DE MUESTRAS DE CLORHIDRATO DE COCAÍNA FORENSIC ANALYSIS OF COCAINE SAMPLES PRODUCED IN COLOMBIA: I. CHROMATOGRAPHIC PROFILING

Vitae, 2009
En este estudio, se perfilan cromátograficamente sesenta y cinco (65) muestras decomisadas de clorhidrato de cocaína. Se les determina la pureza y se hace análisis cualitativo de adulterantes, diluyentes y solventes residuales ocluidos.
William F GARZÓN M, Fabián PARADA A, Néstor M FLORIÁN R   +2 more
doaj  

Applicability of the steady‐state oxygen stable isotope method for estimating metabolism in low‐productivity Arctic lakes

Limnology and Oceanography: Methods, EarlyView.
Abstract Metabolism is a key property of lake ecosystem functioning, but logistical challenges make it difficult to estimate across remote regions. The steady‐state dissolved oxygen (DO) stable isotope method (18O method) estimates metabolism from discrete water samples and thus enables large‐scale surveys.
Fredrik Alriksson, Marcus Klaus, Cristian Gudasz, Matthew Bogard, Gerard Rocher‐Ros, Dominic Vachon, Jan Karlsson   +6 more
wiley   +1 more source

Uncertainty in aquatic greenhouse gas flux estimates arises from subjective processing of floating chamber time series

Limnology and Oceanography: Methods, EarlyView.
Abstract Accurate quantification of greenhouse gas (GHG) fluxes from aquatic systems is essential for constraining regional and global carbon budgets. Closed floating chambers are widely used to measure carbon dioxide (CO2) and methane (CH4) fluxes at the water–air interface, yet large uncertainties persist due to subjective processing of chamber time ...
Camille Minaudo, Miguel Cabrera‐Brufau, Jorge Juan Montes‐Pérez, Katrin Attermeyer, Antonio Camacho, Alba Camacho‐Santamans, Constantin Cazacu, Relu Giuca, Ana Lillebø, Benjamin Misteli, Daniel Morant, Biel Obrador, Bruna R.F. Oliveira, Jolita Petkuviené, Antonio Picazo Mozo, Carlos Rochera, Daniel von Schiller   +16 more
wiley   +1 more source

An unbiased approach elucidates variation in (S)-(+)-linalool, a context-specific mediator of a tri-trophic interaction in wild tobacco

, 2019
Plant volatile organic compounds (VOCs) mediate many interactions, and the function of common VOCs is especially likely to depend on ecological context.
Baldwin, I., Fandino, R., Gase, K., Halitschke, R., He, J., Knaden, M., Köllner, T., Luck, K., Murdock, M., Ray, R., Schuman, M.   +10 more
core   +1 more source

headspace Evaluation Report: Independent Evaluation headspace: The National Youth Mental Health Foundation

, 2009
SPRC Report Series 19 ...
Muir, K, Powell, A, Patulny, R, Flaxman, S, McDermott, S, Oprea, I, Gendera, S, Vespignani, J, Sitek, T, Abelló, D, Katz, I   +10 more
openaire   +2 more sources

Chemical Ionization Mass Spectrometry: Fundamental Principles, Diverse Applications, and the Latest Technological Frontiers

Mass Spectrometry Reviews, EarlyView.
ABSTRACT The review examines the evolution of chemical ionization mass spectrometry (CI‐MS), a technique developed in 1966 by Field and Munson. CI is a soft‐ionization method that produces more intense molecular ions with less fragmentation than electron ionization (EI).
Malvika Dutt, Adriana Arigò, Giorgio Famiglini, Pierangela Palma, Achille Cappiello   +4 more
wiley   +1 more source

The oxygen‐sensing FixLJ represses nitrogen fixation in Rhodopseudomonas palustris in response to oxygen

mLife, EarlyView.
Abstract Biological nitrogen fixation in symbiotic diazotrophs is subject to oxygen regulation by an oxygen‐sensing FixLJ two‐component system under micro‐oxic conditions. However, it remains unclear whether this mechanism is conserved in free‐living diazotrophs.
Lingwei Cui, Yan Zeng, Mengmei Wang, Lu Huang, Zheyi Wang, Ying Liu, Yanning Zheng   +6 more
wiley   +1 more source

Simultaneous determination of 22 volatile organic compounds in urine of automotive spray painting workers using static headspace gas chromatography-mass spectrometry

环境与职业医学
BackgroundAutomotive repair workers are exposed to a wide variety of volatile organic compounds (VOCs) during painting operations, which poses significant health risks.
Mengmeng LIU, Junyu PAN, Baofeng LIU, Qiang ZENG   +3 more
doaj   +1 more source

GC-Recomposition-Olfactometry (GC-R) and multivariate study of three terpenoid compounds in the aroma profile of Angostura bitters. [PDF]

, 2019
Foods and beverage aroma results from multicomponent mixtures of volatile compounds present in the food that interact with olfactory receptors and produce a perceptual response in the brain.
Ebeler, Susan E, Heymann, Hildegarde, Hjelmeland, Anna K, Johnson, Arielle J   +3 more
core  

Generalist‐pollinated Arabis alpina exhibits floral scent variation at multiple scales

Nordic Journal of Botany, EarlyView.
Plants that depend on animals for reproduction often use complex floral traits to attract pollinators. Floral scent is recognized as part of the pollinator attraction module and can be shaped by plant‐pollinator interactions. In recent decades, research has started to reveal the dynamic properties of floral scent, identifying patterns of spatial and ...
Hanna Thosteman, Katherine Eisen, Clara McNaughton Montgomery, Xuefei Cheng, Loretta Pace, Magne Friberg   +5 more
wiley   +1 more source