Results 241 to 250 of about 178,057 (307)

Natural Aging of Biomaterials in Ambient and Physiological Environments

Advanced NanoBiomed Research, EarlyView.
Biomaterials used in biomedical applications can change their physical properties over time, even under ambient and physiological conditions. This review highlights key studies on the natural aging of materials ranging from soft hydrogels to metals and ceramics, emphasizing how time‐dependent changes influence function and performance.
Shuyu Zhang, Anne E. Staples
wiley   +1 more source

Promiscuity‐Guided Enzyme Evolution via Substrate Multiplexed Screening

Angewandte Chemie, EarlyView.
Through historical context and recent examples, this Minireview summarizes the strengths, limitations, and practical considerations for the implementation of substrate multiplexed screening (SUMS) in enzyme evolution. ABSTRACT An enzyme's ability to react with diverse substrates while maintaining high yield and selectivity, termed “substrate ...
Holly A. Weilbaker, Meghan E. Campbell, Peyton M. Higgins, Andrew R. Buller   +3 more
wiley   +1 more source

Accelerated Discovery‐to‐Unveiling of High‐Performance and Affordable Ammonia Electrode Process by Human–Machine Collaboration Framework

Angewandte Chemie, EarlyView.
By employing dimensionally reduced reaction descriptors, a human–machine collaboration framework for efficient electrochemical nitrate reduction to NH3 electrocatalysts screening is established and drastically shorten the discovery timeframe. A new kinetic model is established in combination with a rotating ring‐disk electrode, unveiling the pivotal ...
Yingying Cheng, Masaki Takeguchi, Abraham Castro Garcia, Ken Sakaushi   +3 more
wiley   +1 more source

Upcycling Water Pollutants Into Long‐Chain Polymers via Synergistic Interfacial Dechlorination and Organic Radical Stabilization

Angewandte Chemie, EarlyView.
HEO‐regulated electronic structure drives nonradical PI activation, promoting ETP‐mediated polymerization of 4CP into high‐molecular‐weight products with enhanced surface enrichment. Concurrent dechlorination occurs via radical coupling and •OHads attack, enabling efficient carbon retention and selective product evolution at the liquid–solid interface.
Ziwei Yao, Yidi Chen, Penghui Shao, Jian Liu, Xiaodan Wang, Kunsheng Hu, Xubiao Luo, Nanqi Ren, Xiaoguang Duan   +8 more
wiley   +1 more source

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Colorimetric Assay of Levodopa

Journal of Pharmaceutical Sciences, 1972
Abstract A new colorimetric assay method for levodopa, based on the reaction with isonicotinic acid hydrazide in alkaline medium, is reported. Data on precision, accuracy, and specificity are also given. The method, owing to its simplicity, is particularly suited for the routine purity control of levodopa.
N, Maggi, A, Cometti
openaire   +2 more sources

Colorimetric assay of digitoxin

Journal of the American Pharmaceutical Association (Scientific ed.), 1948
A colorimetric method in which sodium beta-naphthoquinone-4-sulfonate (purified) is reacted with digitoxin in alkaline solution to form a purple color is proposed for the determination of digitoxin. The purple color quickly reaches a maximum and fades, but the addition of acetic acid at the time of maximum development changes the color to yellow and ...
A T, WARREN, F O, HOWLAND, L W, GREEN
openaire   +2 more sources

Colorimetric Assay of Epinephrine

Journal of Pharmaceutical Sciences, 1974
A new colorimetric assay method for epinephrine, based on the reaction with thiosemicarbazide in alkaline medium, is presented. Beer's law is followed in the range of 25–300 μg. Data on precision, accuracy, and specificity are included. A special calculation is adopted in the presence of norepinephrine.
R B, Salama, S K, Khalil
openaire   +2 more sources

Colorimetric Assay of Nystatin

Journal of Pharmaceutical Sciences, 1963
A colorimetric method to assay nystatin both as powder and in pharmaceutical preparations is described. Nystatin is hydrolyzed with sodium hydroxide; the yellow color produced is extracted from a buffered solution into chloroform and measured colorimetrically. Comparison with microbiological assay is shown in a degradation experiment.
J C, CHANG, A B, HONIG, A T, WARREN, S, LEVINE   +3 more
openaire   +2 more sources

Colorimetric Assay of Disulfiram

Journal of Pharmaceutical Sciences, 1973
A quantitative assay for disulfiram was developed based on color formation during the interaction of disulfiram, ethanol, and cyanide. A linear curve is obtained over a wide range of disulfiram concentrations. Metabolites of disulfiram do not interfere in this assay.
R, Fried, A N, Masoud, F M, Klein
openaire   +2 more sources