Search results for "ACID"
showing 10 items of 13107 documents
Fatty acid composition as biomarkers of freshwater microalgae: analysis of 37 strains of microalgae in 22 genera and in seven classes
2013
The fatty acid (FA) composition of algae is an important determinant of their food quality for consumers, and FAs can also be used as biomarkers for biochemical and energetic pathways in food webs. FA analyses of 7 freshwater algal classes and 37 strains showed clear similarity within classes and strong differences amongst classes. Class was a dominant factor (66.4%) explaining variation in FA signatures of microalgae. The 7 algal classes comprised 4 separate groups according to their FA profiles: (1) Chlorophyceae and Trebouxiophyceae, (2) Bacillariophyceae, (3) Cryptophyceae, Chrysophyceae, and Raphidophyceae, and (4) Euglenophyceae. Each group had a characteristic FA composition, althoug…
Low-protein vegetarian diet does not have a short-term effect on blood acid¿base status but raises oxygen consumption during submaximal cycling
2012
Background. Acid–base balance refers to the equilibrium between acids and bases in the human body. Nutrition may affect acid–base balance and further physical performance. With the help of PRAL (potential renal acid load), a low-protein vegetarian diet (LPVD) was designed to enhance the production of bases in body. The aim of this study was to investigate if LPVD has an effect on blood acid–base status and performance during submaximal and maximal aerobic cycling. Methods. Nine healthy, recreationally active men (age 23.5 ± 3.4 yr) participated in the study and were randomly divided into two groups in a cross-over study design. Group 1 followed LPVD for 4 days and group 2 ate normally (ND) …
Biological and Proteomic Characterization of the Anti-Cancer Potency of Aqueous Extracts from Cell-Free Coelomic Fluid of Arbacia lixula Sea Urchin i…
2022
Echinoderms are an acknowledged source of bioactive compounds exerting various beneficial effects on human health. Here, we examined the potential in vitro anti-hepatocarcinoma effects of aqueous extracts of the cell-free coelomic fluid obtained from the sea urchin Arbacia lixula using the HepG2 cell line as a model system. This was accomplished by employing a combination of colorimetric, microscopic and flow cytometric assays to determine cell viability, cell cycle distribution, the possible onset of apoptosis, the accumulation rate of acidic vesicular organelles, mitochondrial polarization, cell redox state and cell locomotory ability. The obtained data show that exposed HepG2 cells under…
Antecedentes estratégicos de la capacidad de innovación empresarial y sus efectos en los resultados
2016
La presente tesis doctoral propone un modelo teórico sobre los antecedentes estratégicos que influyen en la capacidad de innovación de la empresa y su relación con los resultados empresariales. El modelo se construye desde una aproximación integradora de teorías y enfoques que une la teoría de recursos y capacidades y su extensión al enfoque de las capacidades dinámicas y el enfoque basado en el conocimiento, el enfoque al marketing, la teoría del aprendizaje organizacional y la Lógica Dominante del Servicio. Tras una aproximación cualitativa, el modelo se contrastó empíricamente con una muestra representativa de 210 empresas de Valencia y su área metropolitana con representación proporcion…
Relación entre la innovación y el performance en empresas de base tecnológica (ebts) del sector de tecnologías de información en Colombia
2017
El presente trabajo busca contribuir mediante el examen de los procesos de innovación a nivel microeconómico, a la identificación de las dificultades e incentivos de las empresas para emprender esfuerzos de innovación, y los efectos que tienen sobre el desempeño de las firmas que emprenden esos procesos de innovación. En el contexto relacionado de los procesos de innovación, las organizaciones buscan mantener o desarrollar ventajas competitivas que les permitan aprovechar y lograr un posicionamiento estratégico en el entorno socio económico al cual pertenecen. Estas ventajas competitivas se vinculan habitualmente con los recursos y capacidades empresariales u organizativos que desarrolla ca…
Relay Catalysis: Enantioselective Synthesis of Cyclic Benzo-Fused Homoallylic Alcohols by Chiral BrOnsted Acid-Catalyzed Allylboration/Ring Closing M…
2013
Six- and seven-membered benzo-fused cyclic homoallylic alcohols can be readily synthesized by a tandem chiral BrOnsted acid-catalyzed allyl (crotyl)boration/ring closing metathesis sequence performed under orthogonal relay catalysis conditions. Excellent enantio- and diastereoselectivities are obtained in most of the cases. In addition, the parent crotylboration/RCM process is also described. The required substrates, ortho-vinylbenzaldehydes, are readily available in one step from commercially available starting materials. Both catalysts and reactants are also available from commercial suppliers. The reaction shows broad functional group compatibility and is also suitable for heteroaromatic…
Effects of temperature rising and ocean acidification on reproductive success in the sea urchin Arbacia lixula (L.)
2011
Estudio de la vía visual mediante tomografía de coherencia óptica y resonancia magnética cerebral y medular para la formulación y validación de model…
2020
Estudiar la correlación entre valores de tomografía de coherencia óptica (OCT, Optical Coherence Tomography) peripapilar y macular con volumetrías cerebrales y espinales determinadas a partir de imágenes de resonancia magnética (RM), teniendo en cuenta el tipo de esclerosis múltiple (EM) y el antecedente de neuritis óptica (NO). Formular y validar modelos matemáticos para la predicción de la discromatopsia y de la discapacidad a partir de marcadores clínicos y paraclínicos. MATERIAL Y MÉTODO: Estudio observacional, analítico y transversal de 92 pacientes de la Unidad Mixta de EM y Neurorregeneración del Hospital Universitario y Politécnico La Fe de Valencia. De cada paciente se recogieron l…
The Missing Member of the Partially O-Alkylated Resorcinarene Family: Synthesis and Conformation of Methyl Tetramethoxy Resorcinarene
2013
An improved Lewis acid catalyzed synthesis method for methyl tetramethoxy resorcinarene is described, which produced the missing lower rim methyl derivative of this partially O-alkylated resorcinarene family. Structural characterization by means of variable temperature NMR experiments and single crystal X-ray diffraction studies furthermore revealed that the resorcinarene core adopts different conformations in the solid state and in solution. peerReviewed