Infra-Red Active Dirac Plasmon Serie in Potassium Doped-Graphene (KC 8) Nanoribbons Array on Al 2 O 3 Substrate

A theoretical formulation of the electromagnetic response in graphene ribbons on dielectric substrate is derived in the framework of the ab initio method. The formulation is applied to calculate the electromagnetic energy absorption in an array of potassium-doped graphene nanoribbons (KC8-NR) deposited on a dielectric Al2O3 substrate. It is demonstrated that the replacement of the flat KC8 by an array of KC8-NR transforms the Drude tail in the absorption spectra into a series of infrared-active Dirac plasmon resonances.
It is also shown that the series of Dirac plasmon resonances, when unfolded across the extended Brillouin zones, resembles the Dirac plasmon. The Dirac plasmon resonances’ band structure, within the first Brillouin zone, is calculated. Finally, an excellent agreement between the theoretical absorption and recent experimental results for differential transmission through graphene on an SiO2/Si surface is presented. The theoretically predicted micrometer graphene nanoribbons intercalation compound (GNRIC) in a stage-I-like KC8 is confirmed to be synthesized for Dirac plasmon resonances.

Red blood cells contain enzymatically active GPx4 whose abundance anticorrelates with hemolysis during blood bank storage

The antioxidant function of the phospholipid hydroperoxide glutathione peroxidase (GPx4) is vital for the homeostasis of many cell types, from neoplastic cells to normal erythroid precursors. However, some functional proteins in erythroid precursors are lost during the development of red blood cells (RBCs); whether GPx4 is maintained as an active enzyme in mature RBCs has remained unclear. Our meta-analyses of existing RBC proteomics and metabolomics studies revealed the abundance of GPx4 to be correlated with lipid-anchored proteins. In addition, GPx4 anti-correlated with lyso-phospholipids and complement system proteins, further supporting the presence of active GPx4 in mature RBCs.
To test the potential biological relevance of GPx4 in mature RBCs, we correlated the rate of hemolysis of human RBCs during storage with the abundance of GPx4 and other heritable RBC proteins. Of the molecules that anti-correlated with the rate of hemolysis of RBCs, proteins that mediate the cellular response to hydroperoxides, including GPx4, have the greatest enrichment. Western blotting further confirmed the presence of GPx4 antigenic protein in RBCs. Using an assay optimized to measure the activity of GPx4 in RBCs, we found GPx4 to be an active enzyme in mature RBCs, suggesting that GPx4 protects RBCs from hemolysis during blood bank storage.

An AIRE-active far-red ratiometric fluorescent chemosensor for specifically sensing Zn 2+ and resultant Zn 2+ complex for subsequent pyrophosphate detection in almost pure aqueous media

A simple Schiff-base fluorescent chemosensor (1) was synthesized by the reaction of 3-amino-pyrazine-2-carbohydrazide and 7-diethylamino-3-formylcoumarin; the sensor 1 displayed a notable green emission at 524 nm in DMSO and an aggregation-induced ratiometric emission (AIRE) at 555 nm in an almost buffered aqueous media (0.5% DMSO content). The AIRE of 1 was quenched following binding to Zn2+ ions, while the fluorescence emission in the far-red region was evidently enhanced at 628 nm. Notably, the ratiometric signal output could be utilized to specifically distinguish Zn2+ among various metal ions.
Moreover, the 1-Zn2+ complex was effectively employed as a fluorescent ratiometric chemosensor for pyrophosphate (PPi) detection. The detection limit was 3.52 μM and 2.45 μM for Zn2+ and PPi, respectively. The binding mechanism was evaluated by 1H NMR, ESI-MS, single-crystal X-ray diffraction, TEM, time-resolved fluorescence spectrophotometry, and density functional theory studies. Overall, owing to its sensitive fluorescence behavior, cell imaging studies demonstrated that this sensor is capable of sensing Zn2+ and PPi in living cells.

A highly emissive AIE-active luminophore exhibiting deep-red to near-infrared piezochromism and high-quality lasing

  • Further development of high-efficiency and low-cost organic fluorescent materials is intrinsically hampered by the energy gap law and spin statistics, especially in the near-infrared (NIR) region. Here we design a novel building block with aggregation-induced emission (AIE) activity for realizing highly efficient luminophores covering the deep-red and NIR region, which originates from an increase in the orbital overlap and electron-withdrawing ability. An organic donor-acceptor molecule (BPMT) with the building block is prepared and can readily form J-type molecular columns with multiple C-H⋯N/O interactions.
  • Notably, such synthesized materials can emit fluorescence centered at 701 nm with extremely high photoluminescence quantum yields (PLQYs) of 48.7%. Experimental and theoretical investigations reveal that the formation of the hybridized local and charge-transfer (HLCT) state and substantial C-H⋯N/O interactions contribute to a fast radiative decay rate and a slow nonradiative decay rate, respectively, resulting in high PLQYs in the solid state covering the NIR range. Remarkably, such BPMT crystals, as a first example, reveal strong-penetrability piezochromism along with a distinct PL change from the deep-red (λ max = 704 nm) to NIR (λ max = 821 nm) region.
  • Moreover, such typical AIE-active luminophores are demonstrated to be a good candidate as a lasing medium. Together with epoxy resin by a self-assembly method, a microlaser is successfully illustrated with a lasing wavelength of 735.2 nm at a threshold of 22.3 kW cm-2. These results provide a promising approach to extend the contents of deep-red/NIR luminophores and open a new avenue to enable applications ranging from chemical sensing to lasing.

Red Active Caspase Staining Kit

K2052-100 ApexBio 100 assays 572 EUR

Red Active Caspase Staining Kit

K2052-25 ApexBio 25 assays 238 EUR

Red Active Caspase-3 Staining Kit

K2053-100 ApexBio 100 assays 572 EUR

Red Active Caspase-3 Staining Kit

K2053-25 ApexBio 25 assays 238 EUR

Red Active Caspase-8 Staining Kit

K2054-100 ApexBio 100 assays 572 EUR

Red Active Caspase-8 Staining Kit

K2054-25 ApexBio 25 assays 238 EUR

Red Active Caspase-9 Staining Kit

K2055-100 ApexBio 100 assays 572 EUR

Red Active Caspase-9 Staining Kit

K2055-25 ApexBio 25 assays 238 EUR

CaspGLOW Red Active Caspase Staining Kit

55R-1297 Fitzgerald 25 assays 296 EUR

CaspGLOW? Red Active Caspase Staining Kit

K190-100 Biovision 523 EUR

CaspGLOW? Red Active Caspase Staining Kit

K190-25 Biovision 240 EUR

CaspGLOW Red Active Caspase 3 Staining Kit

55R-1298 Fitzgerald 25 assays 296 EUR

CaspGLOW Red Active Caspase 8 Staining Kit

55R-1299 Fitzgerald 25 assays 296 EUR

CaspGLOW Red Active Caspase 9 Staining Kit

55R-1300 Fitzgerald 25 assays 296 EUR

CaspGLOW? Red Active Caspase-3 Staining Kit

K193-100 Biovision 533 EUR

CaspGLOW? Red Active Caspase-3 Staining Kit

K193-25 Biovision 240 EUR

CaspGLOW? Red Active Caspase-8 Staining Kit

K198-100 Biovision 523 EUR

CaspGLOW? Red Active Caspase-8 Staining Kit

K198-25 Biovision 240 EUR

CaspGLOW? Red Active Caspase-9 Staining Kit

K199-100 Biovision 517 EUR

CaspGLOW? Red Active Caspase-9 Staining Kit

K199-25 Biovision 240 EUR

Methyl red

MB0627 Bio Basic 25g 61.31 EUR

Neutral red

NB0652 Bio Basic 25g 65.66 EUR

Phenol red

PB0420 Bio Basic 25g 70.88 EUR

Congo Red

HY-D0236 MedChemExpress 500mg 133 EUR

Charge Transfer Metal-Organic Framework Containing the Red-Ox Active TTF/NDI Units for Highly Efficient Near-Infrared Photothermal Conversion

Metal-organic frameworks (MOFs), as a class of new inorganic-organic hybrid crystal materials, may have important application in near-infrared (NIR) photothermal conversion. Herein, we obtained a new charge transfer MOF ( Co-MOF ) with mixed ligands of H 4 TTFTB and bpmNDI incorporating red-ox active tetrathiafulvalene/naphthalene diimide (TTF/NDI) units into one system. Due to the presence of TTF/NDI oxidative and reductive couples, stable radicals can be observed in the MOF.
Additionally, the charge transfer from the electron donor (TTF) to the acceptor (NDI) units results in a broad absorption in NIR region. Co-MOF exhibited the efficient photothermal effect induced by irradiating with NIR laser. Under the 808 nm laser (0.5 W cm -2 ) illumination, the temperature of Co-MOF promptly increases from room temperature to 151.7 °C in only 10 s. Furthermore, a series of polydimethylsiloxane (PDMS) films doped with trace amount of Co-MOF showed efficient NIR photothermal conversion.
Irradiated by 808 nm laser with power of 0.5 W cm -2 , the temperature of [email protected] (0.6 wt%) film can reach a plateau at 62 °C from 20 °C within 100 s. Our experimental results from [email protected] film demonstrates that the effectiveness and feasibility of the material in promising photothermal applications.

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