Search results for "Diffusion"
showing 10 items of 1615 documents
Polygonal mesh segmentation by surface curvature diffusion.
2011
In Vitro Evaluation of Poly(lactide-co-glycolide) In Situ Forming Gels for Bedaquiline Fumarate Salt and Pharmacokinetics Following Subcutaneous Inje…
2021
This study evaluated in vitro and in vivo drug release of bedaquiline from in situ forming gels (ISGs) containing 200 mg eq./g bedaquiline fumarate salt prepared with four different grades of poly(d,l-lactide) (PDLLA) or poly(d,l-lactide-co-glycolide) (PLGA) with a lactide/glycolide ratio of 50/50 or 75/25 and acid (A) or ester (E) end-capping in N-methyl-2-pyrrolidone at a polymer/solvent ratio of 20/80% (w/w). Mean in vitro drug release in 0.05 M phosphate buffer pH 7.4 with 1% (w/v) sodium lauryl sulphate was 37.3, 47.1, 53.3, and 62.3% within 28 days for ISGs containing PLGA5050A, PDLLA, PLGA7525A, and PLGA7525E, respectively. The data suggested that drug release was primarily controlle…
Exploring fast proton transfer events associated with lateral proton diffusion on the surface of membranes
2019
Proton diffusion (PD) across biological membranes is a fundamental process in many biological systems, and much experimental and theoretical effort has been employed for deciphering it. Here, we report on a spectroscopic probe, which can be tightly tethered to the membrane, for following fast (nanosecond) proton transfer events on the surface of membranes. Our probe is composed of a photoacid that serves as our light-induced proton source for the initiation of the PD process. We use our probe to follow PD, and its pH dependence, on the surface of lipid vesicles composed of a zwitterionic headgroup, a negative headgroup, a headgroup that is composed only from the negative phosphate group, or…
History of Spanish research in psychology seen through the scientific journals collected in the Web of Science during the period 2003-2012
2017
Resumen La abundancia y nivel de las publicaciones científicas constituye un indicador de la capacidad, trayectoria y calidad científica de un país, área temática o grupo de investigación. El grado de visibilidad internacional de una revista es un importante indicador sobre su calidad y cada vez es más considerado por las agencias de evaluación de los méritos científicos. Este estudio ofrece un análisis de la evolución de la actividad española en psicología, vista a través de su producción científica en las revistas de psicología recogidas en las bases de datos JCR del SSCI (Social Sciences Citation Index) y del SCI (Science Citation Index) durante 2003-2012. Los resultados indican un creci…
Eina interactiva per a l'anàlisi de fraus editorials en salut
2019
Revistes depredadores; Fraus editorials; Investigació; Publicació Predatory magazines; Editorial frauds; Investigation; Publication Revistas depredadoras; Fraudes editoriales; Investigación; Publicación INTRODUCCIÓ Es presenta una eina destinada als investigadors, elaborada a la Biblioteca de Ciències de la Salut de la UV. L’objectiu és comprovar la credibilitat de revistes potencialment fraudulentes, mitjançant l’anàlisi de la seua presència en bases de dades, recursos d’avaluacio de revistes científiques i el seu grau d’acompliment dels criteris de les associacions d’editors de publicacions mèdiques: https://airtable.com/shruAWiTvt9ubJnCn/tblRP5wUJfU83lbv5?blocks=hide MÈTODE S'ha partit d…
The influence of seawater intrusion on pollulant diffusion in an industrialized coastal area
2006
Germination Pattern of Chamaerops humilis Seed after Short-Time Storage
2015
Dwarf fan palm (Chamaerops humilis) plays an important ecological role in the thermo Mediterranean vegetation stage, both in woodlands, xerophitic shrub communities and degraded ecosystems. Dwarf fan palm is typically propagated from seeds. Whereas other palm species show reduced germination after few months of seed storage, no information is available on the effects of storage time on seed germinability . We examined the germination pattern of dwarf palm seeds aged after a storage of four, six or eight months in comparison to fresh seed (control). A covariance analysis was performed to test the effect of time within seed-storage treatment. The germination patterns were significantly fitted…
In-situ observation of β-ray induced optical absorption in a-SiO2: radiation darkening and room temperature recovery
2008
Social network analysis and political phenomena: a contribution to the small world theory
2014
Spectroscopic studies of semiconducting single-walled carbon nanotubes
2010
The unique nature of optical properties of single-walled carbon nanotubes (SWCNT), together with their promising potential applications, have created enormous interest towards the photophysics of SWCNT. Many aspects of carbon nanotubes originate from the electronic structure of carbon honeycomb lattice and one-dimensionality. SWCNTs exist in various chiral structures and diameters, which the optical and electrical properties are dependent on. It has been discovered that SWCNT excited states are excitonic with strong Coulomb interaction between the electron and the hole. However, many features of excitons are not yet well defined, such as absorption cross-sections, fluorescence quantum yield…