Search results for "Mines"

Luminescent inks based on Eu:PO4 nanoparticles and polyvinyl alcohol for anti-counterfeiting

2022

Grafeenioksidin luminesenssiominaisuudet

2016

Grafeeni on yksikerroksinen hiililevy, joka muodostuu toisiinsa sp2-sidoksilla kiinnittyneistä hiilistä. Grafeenioksidi on grafeenin hapettunut muoto, jossa levyn pintaan on liittynyt funktionaalisia happiryhmiä. Grafeenioksidilla on havaittu laaja luminesenssi, joka riippuu sen hapetusasteesta, pH:sta, viritysaallonpituudesta ja konsentraatiosta. Luminesenssin on arveltu aiheutuvan mm. grafeenioksidin sp2-alueista kvanttirajoituksen takia. Energia voi kvantituttua näillä pienillä alueilla happialueiden muodostaessa potentiaaliseinät niille. Luminesenssin on myös ehdotettu aiheutuvan rakennevirheistä aiheutuvista lokalisoiduista tiloista, funktionaalisten happiryhmien protonaatiosta ja depr…

Heterometallic Au(I)–Cu(I) Clusters : Luminescence Studies and 1O2 Production

2023

Two different organometallic gold(I) compounds containing naphthalene and phenanthrene as fluorophores and 2-pyridyldiphenylphosphane as the ancillary ligand were synthesized (compounds 1 with naphthalene and 2 with phenanthrene). They were reacted with three different copper(I) salts with different counterions (PF6–, OTf–, and BF4–; OTf = triflate) to obtain six Au(I)/Cu(I) heterometallic clusters (compounds 1a–c for naphthalene derivatives and 2a–c for phenanthrene derivatives). The heterometallic compounds present red pure room-temperature phosphorescence in both solution, the solid state, and air-equilibrated samples, as a difference with the dual emission recorded for the gold(I) precu…

Asymmetric Ring Opening in Tetrazine‐based Ligand Affording a Tetranuclear Opto‐Magnetic Ytterbium Complex

2021

We report the formation of a tetranuclear lanthanide cluster, [Yb 4 (bpzch) 2 (fod) 10 ] ( 1 ), which occurs from a serendipitous ring opening of the functionalized tetrazine bridging ligand, bpztz (3,6‐dipyrazin‐2‐yl‐1,2,4,5‐tetrazine) upon reacting with Yb(fod) 3 (fod ‐ = 6,6,7,7,8,8,8‐heptafluoro‐2,2‐dimethyl‐3,5‐octandionate). Compound 1 was structurally elucidated via single‐crystal X‐ray crystallography and subsequently magnetically and spectroscopically characterized to analyse its magnetisation dynamics and its luminescence behaviour. Computational studies validate the observed M J energy levels attained by spectroscopy and provides a clearer picture of the slow relaxation of the ma…

Triplet-State Position and Crystal-Field Tuning in Opto‐Magnetic Lanthanide Complexes : Two Sides of the Same Coin

2019

Lanthanide complex‐based luminescence thermometry and single‐molecule magnetism are two effervescent research fields, owing to the great promise they hold from an application standpoint. The high thermal sensitivity achievable, their contactless nature, along with sub‐micrometric spatial resolution make these luminescent thermometers appealing for accurate temperature probing in miniaturized electronics. To that end, single‐molecule magnets (SMMs) are expected to revolutionize the field of spintronics, thanks to the improvements made in terms of their working temperature – now surpassing that of liquid nitrogen – and manipulation of their spin state. Hence, the combination of such opto‐magn…

Potential Carcinogens in Makeup Cosmetics

2023

Facial makeup cosmetics are commonly used products that are applied to the skin, and their ingredients come into contact with it for many years. Consequently, they should only contain substances that are considered safe or used within an allowable range of established concentrations. According to current European laws, all cosmetics approved for use should be entirely safe for their users, and the responsibility for this lies with manufacturers, distributors, and importers. However, the use of cosmetics can be associated with undesirable effects due to the presence of certain chemical substances. An analysis of 50 random facial makeup cosmetics commercially available on the European Union m…

Current advancement in immunosensing of p53 tumor suppressor protein based on nanomaterials: Analytical approach

2017

Abstract The utility of detection of p53 in tomorrow's personalized health care field will mean early and accurate diagnosis of many types of cancers. This review is meant to provide an overview of the various types of immunosensors and immunoassay have been developed for determination of p53, along with significant advances over the last several years in related technologies. In addition, this review described: • Most frequently applied principles in immunoassay/immunosensing of p53. • The aspects of fabrication in the perspective of immunoassay/immunosensing applications. • The potential of various electrochemical, electrochemiluminescence immunosensors for the determination of p53 within…

Projection and Pinhole-Based Data Acquisition for Small-Animal SPECT Using Storage Phosphor Technology

2007

Three-dimensional Single Photon Emission Computed Tomography (SPECT) can provide high-resolution insight into biomolecular distribution and pharmacokinetics. However, instrument availability and distribution is limited at present,and imaging times can be considerable. To evaluate the large array of novel agents which are becoming available,we find that storage phosphor-based in vivo imaging can provide an important,rapid-throughput transition from the traditional ex vivo sacrifice/gamma counting and autoradiography to full-time course SPECT.

Performance Comparison of a Flow Cytometry-based and Two Commercial Chemiluminescent Immunoassays for Detection and Quantification of Antibodies Bind…

2021

ABSTRACTThe performance of a laboratory-developed quantitative IgG/IgA flow cytometry-based immunoassay (FCI) using Jurkat T cells stably expressing full-length native S protein was compared against Elecsys® electrochemiluminiscent (ECLIA) Anti-SARS-CoV-2 S (Roche Diagnostics, Pleasanton, CA, USA), and LIAISON® SARS-CoV-2 TrimericS IgG chemiluminiscent assay (CLIA) (Diasorin S.p.a, Saluggia, IT) for detection and quantitation of SARS-CoV-2-specific antibodies. A total of 225 serum/plasma specimens from 120 acute or convalescent COVID-19 individuals were included. Overall, IgG/IgA-FCI yielded the highest number of positives (n=179), followed by IgA-FCI (n=177), Roche ECLIA (n=175), IgG-FCI (…

Morelloflavone, a novel biflavonoid inhibitor of human secretory phospholipase A2 with anti-inflammatory activity

1997

Abstract The flavanonylflavone morelloflavone inhibited secretory phospholipase A 2 (PLA 2 ) in vitro , with a high potency on the human recombinant synovial and bee venom enzymes ( IC 50 = 0.9 and 0.6 μM, respectively). The inhibition was apparently irreversible. In contrast, the compound was inactive on cytosolic PLA 2 activity from human monocytes. Morelloflavone scavenged reactive oxygen species generated by human neutrophils ( IC 50 = 2.7 and 1.8 μM for luminol and lucigenin, respectively) but did not modify cellular responses such as degranulation or eicosanoid release. This biflavonoid exerted anti-inflammatory effects in animal models, with a potent inhibition of 12-O-tetradecanoylp…