Results 261 to 270 of about 1,604,591 (318)

Resumos Tema I - Considerações éticas, políticas e legislativas quanto ao uso de animais na ciência e na indústria

Vigilância Sanitária em Debate: Sociedade, Ciência & Tecnologia, 2014
openaire   +2 more sources

A Low‐Cost Curvature Detection Method for an Untethered Biped Pipeline Climbing Robot with Energy‐Efficient Strategy

Advanced Robotics Research, EarlyView.
A low‐cost pipeline curvature detection method has been proposed for an untethered biped pipeline surface climbing robot (BPCR) system with a five‐degree‐of freedom structure. The BPCR features adaptive vacuum suction cups equipped with multiple laser sensors on the suction modules to detect the curvature of various surfaces.
Zikang Li, Weijian Zhang, Yuan Yin, Qingsong Xu   +3 more
wiley   +1 more source

Biodegradation assessment tests of biopolymers in standardised water: different sources of variability. [PDF]

Biodegradation
Gutiérrez-Rial D, Villar I, Feijóo P, Soto B, Garrido J, Mato S.   +5 more
europepmc   +1 more source

Asymmetric Synthesis of Highly Substituted Spiro[2H‐pyrrole‐2,3‐Succinimide] Derivatives by Copper‐Catalyzed Post‐Ugi Reactions

Advanced Synthesis &Catalysis, EarlyView.
Abstract Herein we present a novel one‐pot methodology for the synthesis of enantioenriched 2H‐pyrrolespirosuccinimides by copper‐catalyzed reactions on Ugi adducts derived from enantiopure α‐alkylbenzyl amines through a chirality transfer process. We have proposed a mechanism, supported by density functional theory (DFT) calculations, where a hydrogen
Javier Gómez‐Ayuso, Israel Carreira‐Barral, Roberto Quesada, María García‐Valverde   +3 more
wiley   +1 more source

The Impact of Biocontrol Agents on the Metabolome of <i>Penicillium nordicum</i> Strains and Its Relation to Ochratoxin A Production on Dry-Cured Ham. [PDF]

Toxins (Basel)
Cebrián E, Roncero E, Luz J, Rodríguez M, Sousa Silva M, Cordeiro C, Núñez F.   +6 more
europepmc   +1 more source

Synthesis of spirolactones from carbonyls via carboborylation of N‐sulfonylhydrazones with alkoxycarbonylalkylboronic acids

Advanced Synthesis &Catalysis, Accepted Article.
A straightforward synthesis of spirolactones from carbonyls via N‐tosylhydrazones is described. The process consist in the reaction between the N‐tosylhydrazone and ethoxycarbonylethylboronic acid or ethoxycarbonylpropylboronic acid, leading to spiro γ‐butyrolactones or δ‐valerolactones respectively. The transformation takes place by carboborylation of
Lucía López, Sara Filgueira, María-Paz Cabal, Alfonso Carlos Valdés-Gómez   +3 more
wiley   +1 more source

Titanium-based hybrid coatings grown using ALD/MLD onto AZ31 screw-like supports for implantable systems. [PDF]

RSC Adv
Silva RM, Oliveira FJ, Lima MF, Silva NA, Miranda G.   +4 more
europepmc   +1 more source

Pot‐Economical Synthesis of Fluorinated Pyrrolizinone Derivatives

Advanced Synthesis &Catalysis, EarlyView.
Abstract A new family of fluorinated dihydropyrrolizinones has been synthesized starting from fluorinated enamino amides and aliphatic conjugated ketones. The reaction comprises a cross metathesis reaction followed by a tandem cycloaromatization/ enamine hydrolysis/ intramolecular Friedel‐Crafts alkylation sequence.
Lidia Prieto, Marcos Escolano, Daniel Gaviña, Luis Paredes‐Soler, Santiago Díaz‐Oltra, María Sánchez‐Roselló, Carlos del Pozo   +6 more
wiley   +1 more source

Minimizing Energy Demand in the Conversion of Levulinic Acid to γ‑Valerolactone via Photothermal Catalysis Using Raney Ni. [PDF]

Adv Sci (Weinh)
Bujaldón R, Fons A, Garcia-Amorós J, Vaca C, Nogués J, Esplandiu MJ, Gómez E, Sepúlveda B, Serrà A.   +8 more
europepmc   +1 more source