Search results for "solu"
showing 10 items of 7577 documents
TiO2-based photocatalysts impregnated with metallo-porphyrins employed for degradation of 4-nitrophenol in aqueous solutions: role of metal and macro…
2007
Photodegradation of organic compounds in water solutions by means of economically advantageous and environment-friendly processes is a topic of growing interest. In recent years a great attention has been devoted to TiO2-based photocatalysts for the oxidative degradation of various organic pollutants. In this context, we have prepared new photo-catalytic polycrystalline TiO2 systems impregnated with sensitizers, i.e., copper, iron or manganese porphyrins, and investigated their photoactivity for 4-nitrophenol oxidation compared with that of bare TiO2. A significant improvement of the photoreactivity was observed in the case of TiO2 impregnated with copper porphyrin, while only a slight bene…
The Interconnecting Hairpin Extension "Arm": An Essential Allosteric Element of Phytochrome Activity
2023
In red-light sensing phytochromes, isomerization of the bilin chromophore triggers structural and dynamic changes across multiple domains, ultimately leading to control of the output module (OPM) activity. In between, a hairpin structure, "arm", extends from an interconnecting domain to the chromophore region. Here, by removing this protein segment in a bacteriophytochrome from Deinococcus radiodurans (DrBphP), we show that the arm is crucial for signal transduction. Crystallographic, spectroscopic, and biochemical data indicate that this variant maintains the properties of DrBphP in the resting state. Spectroscopic data also reveal that the armless systems maintain the ability to respond t…
Viidennen sukupolven matkapuhelinverkkojen arkkitehtuuri
2017
Tulevaisuudessa maailman mobiiliverkoissa kulkevan datan määrä kasvaa yhä kiihtyvällä tahdilla ja kirjallisuudessa on siksi pohdittu mobiiliverkkojen seuraavaa suurta kehitysaskelta. Tässä tutkielmassa käydään läpi viidennen sukupolven matkapuhelinverkoissa hyödynnettäviä teknologioita, sekä mahdollisia tapoja rakentaa 5g-verkko. Etenkin suurta verkon kapasiteettia vaativilla alueilla verkon rakenne tulee muuttumaan ja tällöin mobiiliverkot eivät ole enää yhtä makrosolupainotteisia kuin ennen. In the future the amount of data in the world's mobile networks will increase and thus in literature there has been discussion about the next great step in the development of mobile networks. This the…
Esijännitystason vaikutus lihassolun pituuteen eksentrisessä lihastyössä
2001
Desarrollo de nuevas estrategias analíticas basadas en la espectrometría de masas de alta resolución (HRMS) para el control de plaguicidas y sus meta…
2018
El uso de plaguicidas en la agricultura, permiten aumentar el rendimiento de las cosechas, evitando pérdidas debidas a animales, plantas y microorganismos que pueden llegar a tener un efecto negativo sobre la producción agrícola. Así, debido a su uso intensivo en las prácticas agrícolas, los plaguicidas pueden contaminar los distintos compartimentos ambientales (agua, suelo, aire, etc). Actualmente, aproximadamente 500 sustancias activas están autorizadas por la Unión Europea para ser aplicadas a los distintos cultivos siguiendo la Regulación CE 1107/2009. Una parte de los plaguicidas se emiten a la atmósfera durante y después de su aplicación. En la atmósfera, los plaguicidas pueden llegar…
Biocompatibility and Antibacterial Properties of ZnO-Incorporated Anodic Oxide Coatings on TiZrNb Alloy
2020
In a present paper, we demonstrate novel approach to form ceramic coatings with incorporated ZnO nanoparticles (NPs) on low modulus TiZrNb alloy with enhanced biocompatibility and antibacterial parameters. Plasma Electrolytic Oxidation (PEO) was used to integrate ZnO nanoparticles (average size 12&ndash
The relationship between visible light emission and species fraction of the hydrogen ion beams extracted from 2.45 GHz microwave discharge.
2015
The relationship between Balmer-α and Fulcher-band emissions with extracted H + , H + 2 , and H + 3 ions is demonstrated for a 2.45 GHz microwave discharge. Ion mass spectra and optical measurements of Balmer-α and Fulcher-band emissions have been obtained with a Wien Filter having an optical viewport on the plasma chamber axis. The beam of approximately 1 mA is analyzed for different plasma conditions simultaneously with the measurement of light emissions both with temporal resolution. The use of visible light emissions as a valuable diagnostic tool for monitoring the species fraction of the extracted beams is proposed. peerReviewed
Facile and efficient chemical functionalization of aliphatic polyesters by cross metathesis
2016
International audience; An effective preparation of new tailor-made macromolecular materials via a combination of two (atom-efficient) catalytic transformations is reported. First, new aliphatic polyesters with alternated composition have been prepared using a salen aluminum catalyst system. Next, the pendant vinyl moieties in those copolymers have been selectively transformed into various functional groups by metathesis in the presence of homogeneous Grubbs catalysts. The latter metathesis reaction has been optimized in terms of catalytic activity and selectivity, to define the conditions for an effective and safe procedure that does not affect the macromolecular architecture. All polymer …
High-resolution laser spectroscopy of long-lived plutonium isotopes
2017
Long-lived isotopes of plutonium were studied using two complementary techniques, high-resolution resonance ionisation spectroscopy (HR-RIS) and collinear laser spectroscopy (CLS). Isotope shifts have been measured on the $5f^67s^2\ ^7F_0 \rightarrow 5f^56d^27s\ (J=1)$ and $5f^67s^2\ ^7F_1 \rightarrow 5f^67s7p\ (J=2)$ atomic transitions using the HR-RIS method and the hyperfine factors have been extracted for the odd mass nuclei $^{239,241}$Pu. Collinear laser spectroscopy was performed on the $5f^67s\ ^8F_{1/2} \rightarrow J=1/2\; (27523.61\text{cm}^{-1})$ ionic transition with the hyperfine $A$ factors measured for $^{239}$Pu. Changes in mean-squared charge radii have been extracted and s…
Effect of substrate rigidity on distribution of nuclear actin and lamin A
2016
Tämä tutkimus keskittyi analysoimaan, onko solun ulkopuolisen ympäristön jäykkyydellä vaikutusta tuman sisäisten proteiinien jakautumiseen. Tuman mekanosensitiivisyyden vaikutusta lamiini A:n ja aktiinin sijaintiin tumassa tutkittiin soluilla, joita kasvatettiin eri jäykkyisillä kasvualustoilla. Kokeissa laskettiin lamiini A:n suhteellinen määrä vertaamalla tumalevyyn sitoutunutta ja tumassa vapaana olevaa lamiini A:ta, sekä suhteellinen määrä aktiinille vertaamalla tumansisäisen aktiinin määrää solulimassa olevaan. Kahta eri jäykkyistä (1,5 kPa ja 33 kPa Youngin moduluksella) polyakryyliamidi (PAA)-geeliä käytettiin säädettävänä kasvualustana soluille. Näillä geeleillä kasvatettiin hiiren …