Results 71 to 80 of about 18,361 (259)

Adaptive Cu Reconstruction in Heterostructure Drives High‐Rate Nitrate‐to‐Ammonia Conversion

Advanced Science, EarlyView.
An adaptively reconstructed Cu/CoOX heterojunction, featuring a surface‐localized, hydroxyl‐rich oxidized Cu species, forms in situ from a CuO/CoOX (Co1Cu9OX) pre‐catalyst during electrochemical nitrate reduction. The self‐adaptive reconstruction and the incorporation of heterostructure regulate nitrogen‐containing intermediate adsorption and *H supply,
Chunyu Yuan, Saikat Bolar, Yongzheng Zhang, Akitaka Ito, Tatsuhiko Ohto, Takeshi Fujita   +5 more
wiley   +1 more source

Influência das características físico-químicas e composição elementar nas cores de méis produzidos por Apis mellifera no sudoeste da Bahia utilizando análise multivariada Influence of physicochemical and elemental composition on honey colors produced by Apis mellifera in southwest Bahia using multivariate analysis

Química Nova, 2010
In this study honey samples produced in the southwest of Bahia were characterized based on physicochemical and mineral (Ca, Mg, Na, K, Mn, Fe and Zn) composition. The metals were determined by atomic absorption spectrophotometry.
Julian Júnio de Jesus Lacerda, José Soares dos Santos, Shaiala Aquino dos Santos, Gisele Brito Rodrigues, Maria Lúcia Pires dos Santos   +4 more
doaj   +1 more source

Studies on Atomic-absorption Spectrophotometry. III. Determination of Nickel in Iron and Steel by Atomic-absorption Spectrophotometry

The Journal of the Society of Chemical Industry, Japan, 1963
原子吸光分光光度法による鉄鋼中のニッケルの定量を研究した。原子吸光分光光度法で,ニッケルの定量をおこなう場合,鉄は10mg/ml以下ならばニッケルの吸収に影響を与えなかった。また,その他の元素もモリブデン酸,リン酸塩,硫酸塩以外は,ニッケルの測定に障害をあたえなかった。モリブデン酸,リン酸塩,硫酸塩が共存するとニッケルの吸収が増大した。しかし,その程度はわずかであり,しかも鉄,クロムなどがかなりの量共存すると,これらの影響は消失した。鉄鋼中のニッケルは試料を酸で分解し,そのまま炎中に噴霧して吸収を測定することにより定量することができる。微量のニッケルを定量する場合には,ニッケルをジエチルジチオカルバミン酸錯化合物として,メチルイソブチルケトンで抽出し,噴霧する方法が適当であった。多量の試料を用い ...
Tsugio Takeuchi, Masami Suzuki, Hideyuki Michiki   +2 more
openaire   +2 more sources

Revolutionising Agricultural Sustainability: New ‘Furrow Tillage’ can Mitigate Short‐Term Soil‐to‐Atmosphere CO2 Flux and Promote Soil‐Plant‐Microbe Health

Advanced Science, EarlyView.
Furrow tillage resolves the conventional‐vs.‐no‐tillage trade‐off by simultaneously cutting CO2 efflux to 2.0–3.0 g C m−2 d−1 and unlocking high nutrient availability for the rice rhizosphere. This scalable agronomic solution strengthens soil health, enhances plant physiology, reshapes microbial metabolism, and shifts paddy systems toward a net ...
Arnab Majumdar, Munish Kumar Upadhyay, Argha Ghosh, Rakesh Biswas, Ioly Kotta Loizou, Martin Buck, Mark Tibbett, Biswajit Giri, Debojyoti Moulick, Manoj Kumar Jaiswal, Tarit Roychowdhury   +10 more
wiley   +1 more source

Determinação de mercúrio em águas sanitárias comercializadas em região do sudeste do Brasil

Revista de Saúde Pública
Para determinação de mercúrio presente como contaminante nas águas sanitárias usadas para desinfecção de água e alimentos, foi proposto um tratamento de amostra com ácido clorídrico para eliminação do cloro.
Odair Zenebon, Franca Durante de Maio, Alice M. Sakuma, Eliani Rosa   +3 more
doaj  

Recent Microextraction Techniques for Determination and Chemical Speciation of Selenium

Open Chemistry, 2017
Research designed to improve extraction has led to the development of microextraction techniques (ME), which involve simple, low cost, and effective preconcentrationof analytes in various matrices.
Ibrahim Ahmed S. A., Al-Farawati Radwan, Hawas Usama, Shaban Yasser   +3 more
doaj   +1 more source

Dielectric Elastomer Actuators as Safe and Effective Tools for Mechanostimulation of Human Cells

Advanced Intelligent Systems, EarlyView.
Replicating physiological forces is crucial for realistic cell models. Dielectric elastomer actuators (DEAs) offer a soft alternative, though their high voltages raised toxicity concerns. We demonstrate that DEA stimulation causes no cell damage, cell death or cell‐cycle disruption, while activating mechanosensitive responses.
Simon Holzer, Chaimae Bahou, Noe Syfrig, Katia Monastyrskaya, Yoan Civet, Ali Hashemi Gheinani, Yves Perriard   +6 more
wiley   +1 more source

Speciation and determination of mercury by various analytical techniques

Reviews in Analytical Chemistry, 2013
Mercury is one of the most important metals to environmental researchers due to its toxicity. In recent years, many authors determined the concentration of mercury and its different forms in the environment, such as soil, water, atmosphere and biota ...
Suvarapu Lakshmi Narayana, Seo Young-Kyo, Baek Sung-Ok   +2 more
doaj   +1 more source

Cell therapy comparison of dental pulp stem cells, hepatocytes, and their exosomes for liver fibrosis treatment in rats

Animal Models and Experimental Medicine, EarlyView.
DPSCs, hepatocytes, and exosomes were tested for liver fibrosis therapy. Exosome‐based treatment exhibited superior antioxidative and regenerative effects. Liver enzymes, oxidative stress, and profibrotic markers were significantly reduced. α‐SMA, desmin, and related gene expression were downregulated.
Sahar Rahimi, Seyedeh Mahdieh Khoshnazar, Ali Derakhshani, Nader Shahrokhi   +3 more
wiley   +1 more source

Analysis of Mercurial Preservatives in Different Vaccines by Cold Vapor Atomic Absorption Spectrophotometry

Journal of Analytical Science and Technology, 2012
Vaccines with low concentration of mercurial preservatives, such as thiomersal, are in use in Albania. A simple and a sensitive method by using CVAAS method for the determination of mercury in vaccine samples is described.
Pranvera Lazo, Merita Kucuku
doaj