Results 51 to 60 of about 1,126 (135)

ANÁLISE DA BIOTINA EM AMOSTRAS DE VITAMINAS COMERCIAIS E MANIPULADA UTILIZANDO ESPECTROSCOPIA NO INFRAVERMELHO FTIR-UATR

Revista Univap, 2017
A biotina, também conhecida como vitamina H, é uma vitamina importante aos organismos vivos, necessária no metabolismo das proteínas e dos carboidratos, ela age diretamente na formação da pele. É uma vitamina hidrossolúvel. As principais fontes alimentares de biotina são frutas, nozes, ovos, carnes, leite e levedura.
Silva, Isabel Christina, Cho, Liu Yao, Sakane, Kumiko Koibuchi   +2 more
openaire   +4 more sources

Fast Reduction of Nitroalkenes Into Nitroalkanes Under Continuous‐Flow Chemical Conditions

European Journal of Organic Chemistry, Volume 29, Issue 24, 23 June 2026.
Flow chemical synthesis was employed for the reduction of nitroalkenes to the corresponding nitroalkanes using sodium borohydride as the reducing agent. The reaction proceeds in only 150 s, affording products from good‐to‐excellent yields (61–96%). Herein, we describe an efficient and rapid continuous‐flow reduction of nitroalkenes to nitroalkanes. The
Iqra Munir, Gianmarco Simonelli, Marino Petrini, Alessandro Palmieri   +3 more
wiley   +1 more source

Processability and Crosslink Density: Role of Peptizers in Natural Rubber and Chlorobutyl Rubber

Journal of Applied Polymer Science, Volume 143, Issue 22, June 10, 2026.
This work evaluates how chemical and physical peptizers affect mastication, vulcanization behavior, and network formation in natural rubber and chlorobutyl rubber. Size‐exclusion chromatography, rheometry, DSC, and swelling analyses demonstrate improved processability but reduced crosslink density with peptizer addition.
Amanda F. Baruel, Sérgio L. G. Petroni, Sandra A. C. de Mello, Jorge C. N. Dutra, Silvana N. Cassu   +4 more
wiley   +1 more source

Navigating the Depths: A Comprehensive Survey of Deep Learning for Passive Underwater Acoustic Target Recognition

IEEE Access
The field of deep learning is a rapidly developing research area with numerous applications across multiple domains. Sonar (SOund Navigation And Ranging) processing has traditionally been a field of statistical analysis.
Nils Muller, Jens Reermann, Tobias Meisen   +2 more
doaj   +1 more source

Sodium Tetraazidoaurate(III)—From Na[AuCl4]·2H2O to Na[Au(N3)4] and Beyond One Step at a Time

Chemistry – A European Journal, Volume 32, Issue 22, 9 June 2026.
Novel sodium chlorido‐/azidoaurate(III) dihydrates Na[AuCl4–x(N3)x]·2H2O (x = 0, 1, 2, 3, 4) provide the first example of a complete series of gradual substitution on tetramer complex anions to be described. Controlled dehydration of Na[Au(N3)4]·2H2O leads to Na[Au(N3)4]·H2O and Na[Au(N3)4], the latter being a highly explosive material.
Mehmet Somer, Joannis Psilitelis, Raul Cardoso‐Gil, Thomas Doert, Franziska Jach, Ayberk Yılmaz, Alexander Ovchinnikov, Yurii Prots, Helge Rosner, Marcus P. Schmidt, Peter Höhn   +10 more
wiley   +1 more source

Formulation and Characterization of Fucoidan‐Based Hydrogels for 3D Printing Applications

Journal of Food Process Engineering, Volume 49, Issue 6, June 2026.
Algal polysaccharide‐based hydrogels combining fucoidan, sodium alginate, and agar showed suitable rheological and structural properties for extrusion‐based 3D printing. The formulation containing equal concentrations of alginate and agar exhibited superior printability, structural stability, and printing fidelity.
Natalie Stephanie Sawada Nunes, Camila Yamashita, Izabel Cristina Freitas Moraes, Loic Hugues Gilles Hilliou, Ciro Cesar Zanini Branco, Charles Windson Isidoro Haminiuk, Arthur Torres Negreiros, Cassia Roberta Malacrida Mayer, Ivanise Guilherme Branco   +8 more
wiley   +1 more source

Assessment of the Interaction between Ammonium Dinitramide and Isocyanurate Bonding Agents for Application on Technologies of Composite Solid Propellants

Propellants, Explosives, Pyrotechnics, Volume 51, Issue 5, Page 724-732, May 2026.
This work investigates the interaction of two isocyanurate‐based bonding agents with ammonium dinitramide: triallyl isocyanurate and 1,3,5‐tris(2‐hydroxyethyl) isocyanurate, which contain alkene and hydroxyl functional groups in their side chains, respectively.
Jessica O. Silva, Josiane R. C. Silva, Kamila P. Cardoso, Milton F. Diniz, Márcio Y. Nagamachi, Luiz F. A. Ferrão   +5 more
wiley   +1 more source

Cross-Domain Contrastive Learning-Based Few-Shot Underwater Acoustic Target Recognition

Journal of Marine Science and Engineering
Underwater Acoustic Target Recognition (UATR) plays a crucial role in underwater detection devices. However, due to the difficulty and high cost of collecting data in the underwater environment, UATR still faces the problem of small datasets.
Xiaodong Cui, Zhuofan He, Yangtao Xue, Keke Tang, Peican Zhu, Jing Han   +5 more
doaj   +1 more source

From Hemp Bast to Lyocell Fiber: Sustainable Process Optimization for Lyocell‐Grade Dissolving Pulp

Journal of Applied Polymer Science, Volume 143, Issue 16, April 20, 2026.
This study presents a sustainable method to produce lyocell‐grade dissolving pulp from Canadian hemp bast fibers. A simplified alkali‐chelation‐bleaching process, free from sulfur and chlorine, yielded high α‐cellulose pulp with low lignin and hemicellulose content. The pulp was successfully spun into continuous hemp‐based lyocell fibers, demonstrating
Md Abu Sayed, Lelia Lawson, Bernardo Araujo Souto, K. M. Abdun Noor, Dagem Z. Haddis, Frehiwot T. Hailu, Jane Batcheller, David C. Bressler, Patricia I. Dolez   +8 more
wiley   +1 more source

Exploration of the Phytochemical and Antidiabetic Properties of Teucrium polium: A Natural Asset for Type 2 Diabetes Management

ChemistryOpen, Volume 15, Issue 4, April 2026.
Teucrium polium shows antidiabetic activity with its phytochemical composition and biological activities. The essential oil is rich in carvacrol, thymol, γ‐terpinene, and o‐cymene, while the aqueous and hydroethanolic extracts are characterized by poliumoside, verbascoside, isorhamnetin‐3‐O‐rutinoside, and apigenin‐7‐rutinoside. Antioxidant activity is
Hajar El Ouadni, Aziz Drioiche, Fadoua El Makhoukhi, Omkulthom Al kamaly, Hannou Zerkani, Smail Amalich, Imane Tagnaout, Mohamed Radi, Yahya Cherrah, Touriya Zair, Katim Alaoui   +10 more
wiley   +1 more source