Search results for "MACRO"

An approach to polymer-supported triplet benzophenone photocatalysts. Application to sustainable photocatalysis of an α-diazocarbonyl compound

2013

Covalent immobilization of 4-hydroxybenzophenone on Merrifield resins affords new heterogeneous polymeric triplet photocatalysts. Their successful application in the intramolecular triplet-sensitized photolysis of a α-diazo β-keto ester has been achieved under sustainable criteria. Remarkably, the simple recovery and reuse for up to five sequential applications have been performed, although resulting in a slightly decreasing activity.

Surfactant-assisted chromogenic sensing of cyanide in water

2009

Chromogenic cyanide recognition in water was achieved by the use of a hydrophobic dye in micellar containers.

A New pH-Dependent Macrocyclic Rhodamine B-Based Fluorescent Probe for Copper Detection in White Wine

2019

For efficiently measuring copper (II) ions in the acidic media of white wine, a new chemosensor based on rhodamine B coupled to a tetraazamacrocyclic ring (13aneN4CH2NH2) was designed and synthesized by a one-pot reaction using ethanol as a green solvent. The obtained chemosensor was characterized via NMR, UV and fluorescent spectra. It was marked with no color emission under neutral pH conditions, with a pink color emission under acidic conditions, and a magenta color emission under acidic conditions where copper (II) ions were present. The sensitivity towards copper (II) ions was tested and verified over Ca2+, Ag+, Zn2+, Mg2+, Co2+, Ni2+, Fe2+, Pb2+, Cd2+, Fe3+, and Mn2+, with a detection…

The hedgehog receptor patched is involved in cholesterol transport.

2011

International audience; BACKGROUND: Sonic hedgehog (Shh) signaling plays a crucial role in growth and patterning during embryonic development, and also in stem cell maintenance and tissue regeneration in adults. Aberrant Shh pathway activation is involved in the development of many tumors, and one of the most affected Shh signaling steps found in these tumors is the regulation of the signaling receptor Smoothened by the Shh receptor Patched. In the present work, we investigated Patched activity and the mechanism by which Patched inhibits Smoothened. METHODOLOGY/PRINCIPAL FINDINGS: Using the well-known Shh-responding cell line of mouse fibroblasts NIH 3T3, we first observed that enhancement …

PCARE and WASF3 regulate ciliary F-actin assembly that is required for the initiation of photoreceptor outer segment disk formation

2020

Significance The photoreceptor outer segments are primary cilia, modified for phototransduction by incorporation of stacked opsin-loaded membrane disks that are continuously regenerated. This process is disrupted in several types of inherited retinal dystrophy, but the driving force remained unclear. We show that C2orf71/PCARE (photoreceptor cilium actin regulator), associated with inherited retinal dystrophy subtype RP54, efficiently recruits the Arp2/3 complex activator WASF3 to the cilium. This activates an actin dynamics-driven expansion of the ciliary tip, resembling membrane evagination in lamellipodia formation. Colocalization of this actin dynamics module to the base of the outer se…

Citizens and scientists work together to monitor marine alien macrophytes

2018

The introduction of non-indigenous species (NIS) is an ongoing phenomenon which has been pointed out as a major threat to biodiversity at different levels. NIS may in time become invasive (Invasive Alien Species “IAS”) and may cause biodiversity loss and ecosystem service changes. The Mediterranean Sea is an important hotspot for marine NIS (ca. 1,000 such species recorded to date. To reduce the risk of future IAS introduction and to better understand their invasive potential and spread dynamics, monitoring and surveillance plans are required. The creation of permanent alarm systems and public awareness campaigns are crucial for reducing the risk of IAS introduction. Since intensive monitor…

Studio sul potenziale morfogenico di segmenti di epicotile di Citrus macrophylla Wester.

2007

Responses of macroalgal community to environmental changes

2009

Species of Cystoseira (Ochrophyta, Fucales) seem to be sensitive to a variety of environmental changes, as a consequence of which, they are now used in ecological status assessment. On the contrary, invasive species tend to be more resilient to disturbances than Cystoseira species, and thus environmental changes to allow them to out-compete these species. All these evidences lead to consider Cystoseira species, as well as invasive species, as biological indicators of environmental changes. Therefore, the effects of environmental changes can be measured through: (1) the assessment of the current state of the popu- lations of Cystoseira species and of invasive species, (2) the comparison of i…

Mandrel-less fabrication of biomimetic electrospun microfiber wires for tissue engineering applications

2021

This study introduces a novel mandrel-less electrodeposition method and a novel electrode prototypes useful for tissue engineering applications. More specifically, in this study a novel fabrication protocol to electrospun fibers-based chords, with length spanning from 2 cm to virtually no limitations on longitudinal length, is presented. For the first part of this study, Poly(ester urethane) urea (PEUU) was used to fabricate, by electrodeposition technique, continuous microfiber wires with controlled micro-architecture and tunable mechanics. A novel apparatus to process degradable or non-degradable polymers was used. Soft tissue injuries are common in daily clinical and surgical practice. O…

Química de coordinación de macrociclos con unidades 1H-pirazol

2016

Esta tesis doctoral se ha realizado dentro del campo de estudio de la química supramolecular y se ha basado en la síntesis de receptores macrocíclicos con unidades 1H-pirazol. Estos receptores pueden formar complejos de coordinación con cationes metálicos y complejos aniónicos con aniones inorgánicos de interés medioambiental mediante la formación de enlaces de hidrógeno intermoleculares. Los objetivos planteados para la realización de esta tesis doctoral son: - Síntesis y caracterización de macrocíclicos con unidades 1H-pirazol L1-L7. - Estudio de los receptores fluorescentes L1 y L2 con cationes de metales de transición. -Estudio de la interacción del receptor L3 con aniones de interés me…