Results 81 to 90 of about 68,403 (337)

An accurate determination of the Avogadro constant by counting the atoms in a 28Si crystal

open access: yes, 2010
The Avogadro constant links the atomic and the macroscopic properties of matter. Since the molar Planck constant is well known via the measurement of the Rydberg constant, it is also closely related to the Planck constant.
Andreas, B.   +25 more
core   +1 more source

Vibrational Strong Coupling of Thin Water Layers Using Plasmonic Cavities

open access: yesAdvanced Optical Materials, EarlyView.
The high electric field concentration of plasmonic modes in nanogroove array cavities enables vibrational strong coupling with ultrathin water layers located directly at the metal surface, opening up a new potential pathway for tuning electrocatalytic reactions.
Jyoti Lather   +7 more
wiley   +1 more source

Cinética do fósforo em tecidos de suínos alimentados com dietas contendo enzima fitase Phosphorus kinetics in tissue of growing pigs fed diets containing phytase enzyme

open access: yesArquivo Brasileiro de Medicina Veterinária e Zootecnia, 2004
O experimento foi desenvolvido para avaliar a cinética do P em tecidos de suínos em crescimento, alimentados com rações contendo P orgânico e vários níveis de fitase, com o uso do 32P como indicador.
J.A. Moreira   +3 more
doaj   +1 more source

One‐Pot Cascade Synthesis of Isoquinolinone‐Fused Quinoxalines Through Sequential Rh(III)/Pd(II) Catalysis

open access: yesAdvanced Synthesis &Catalysis, EarlyView.
A new one‐pot, dual catalytic strategy for the synthesis of polycyclic isoquinolinone‐fused quinoxalines from commercially available N‐(2‐acetamidophenyl)benzamides and 1,3‐diynes is reported. This transformation proceeds via Rh(III)/Pd(II)‐mediated sequential NH/CH activation/annulation. Detailed mechanistic studies elucidate the reaction pathway. A
Wei‐Jung Chiu   +3 more
wiley   +1 more source

Absorção de fósforo por híbridos de milho cultivados em solo de cerrado Phosphorus absorption by of corn hybrids grown in savana soils

open access: yesScientia Agricola, 2002
Nos últimos anos, a região do cerrado tem sido uma das principais áreas de expansão agrícola, porém seus solos apresentam grandes limitações à produção agrícola devido à sua elevada acidez e baixa fertilidade natural, principalmente quanto à ...
Cristiano Fernandes, Takashi Muraoka
doaj   +1 more source

Nicotine Reprograms Aging‐Related Metabolism and Protects Against Motor Decline in Mice

open access: yesAdvanced Science, EarlyView.
Long‐term oral nicotine intake protects against age‐related motor decline in mice without eliciting systemic toxicity. Integrated multi‐organ metabolomic profiling and longitudinal gut microbiota analyses reveal that nicotine induces coordinated remodeling of glycolipid and sphingolipid metabolism, enhances NAD⁺ bioavailability, and suppresses ceramide
Shuhui Jia   +29 more
wiley   +1 more source

Blank correction considerations for isotope dilution and reverse isotope dilution calibration: Determination of methylmercury in fish tissue

open access: yesJournal of Analytical Atomic Spectrometry, 2005
A mathematical approach to the accurate correction of the blank when applying isotope dilution (ID) and reverse ID is presented. The manner in which blank correction is undertaken is critical to the quality of the final results. Direct subtraction of a procedural blank from the gross analyte concentration is only valid when the blank contributes to the
Yang, L., Sturgeon, R.
openaire   +3 more sources

Ratio of natural isotopes of nitrogen. I. Primary results: soils of Dombes [Translation from: Revue d'Ecologie et de Biologie du Sol 14, 279-287, 1977] [PDF]

open access: yes, 1980
Utilization of the heavy isotope of nitrogen as a tracer has found numerous applications in soil biology. It allows better definition of different stages of the nitrogen cycle, in particular the immobilization-mineralization cycle.
Chalamet, A.   +2 more
core  

Three Li-rich K giants: IRAS 12327-6523, IRAS 13539-4153, and IRAS 17596-3952

open access: yes, 2005
We report on spectroscopic analyses of three K giants previously suggested to be Li-rich: IRAS 12327-6523, IRAS 13539-4153, and IRAS 17596-3952. High-resolution optical spectra and the LTE model atmospheres are used to derive the stellar parameters: ($T_{
Bacham E. Reddy   +6 more
core   +1 more source

Homeostasis of Gut Microbiota Protects against Susceptibility to Fungal Pneumonia

open access: yesAdvanced Science, EarlyView.
Fungal pneumonia induces inflammation, shown by heightened IL‐6, IL‐1β, TNF‐α levels and a growth in Staphylococcus in the alveolar flora. The gut microbiota, acting through the gut‐lung axis via blood, impacts fungal pneumonia susceptibility by altering lung metabolism and inflammatory responses.
Jian Ji   +12 more
wiley   +1 more source

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