Read by QxMD icon Read

Chemical luminescence

Mo Li, Yifan Jia, Yan Ling, Yilu Chen, Lu Zhang, Dan Luo, Lidan Lai, Meijun Guo, Dalei Zhang, Min Ren, Hong Xu, Haibin Kuang
Expression and function of the follicle‑stimulating hormone receptor (FSHR) are traditionally thought to be limited to the ovary in females. However, recent studies have indicated that the FSHR is also expressed in endothelial cells of the placental vasculature, and that the haploinsufficiency of the feto‑placental FSHR impaired the growth of the mouse placenta. The aim of the current study was to investigate the placental expression of FSH and FSHR in pregnancies complicated by pre‑eclampsia. Placental tissue samples were collected from 20 pregnancies with pre‑eclampsia and 25 normal pregnancies...
May 18, 2017: Molecular Medicine Reports
Jing-Xing Wu, Bing Yan
Using p-phenylenediamine as a precursor, p-carbon dots (p-CDs) with strong red-light emission were encapsulated into a metal-organic framework (MOF) followed by introduction of green light-emitting Tb(3+) to form a two-color light-emitting hybrid (Tb(3+)@p-CDs/MOF). The as-prepared fluorescent-functionalized MOF not only maintained the excellent optical properties of p-CDs and Tb(3+) to give strong emission, but also had good chemical and physical properties. The chosen p-CDs were aggregated readily in water, which led to only very weak photoluminescence, whereas the opposite effect was noted in the organic solvents ethanol, dimethylformamide and cyclopropane...
May 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
David Wiedmer, Fernanda Cristina Petersen, Jessica Lönn-Stensrud, Hanna Tiainen
The chemical decontamination of infected dental implants is essential for the successful treatment of peri-implantitis. The aim of this study was to assess the antibacterial effect of a hydrogen peroxide-titanium dioxide (H2O2-TiO2) suspension against Staphylococcus epidermidis biofilms. Titanium (Ti) coins were inoculated with a bioluminescent S. epidermidis strain for 8 h and subsequently exposed to H2O2 with and without TiO2 nanoparticles or chlorhexidine (CHX). Bacterial regrowth, bacterial load and viability after decontamination were analyzed by continuous luminescence monitoring, live/dead staining and scanning electron microscopy...
May 19, 2017: Biofouling
Na Niu, Zhuoming Ma, Fei He, Shujun Li, Jian Li, Shou-Xin Liu, Piaoping Yang
Carbon dots, which are less than 10 nm in diameter, have been widely investigated because of their unique luminescence properties and potential for use in bioimaging. In the present work, natural carbon dots (L-CDs) were obtained by molecular aggregation, using ethanol-extracted cellulolytic enzyme lignin. The whole process for the preparation of L-CDs was green and simple to operate and did not use toxic chemical reagents or harsh conditions. The newly prepared L-CDs emitted multicolour photoluminescence following one- and two-photon excitation...
May 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Chris S Hawes, Amy D Lynes, Kevin Byrne, Wolfgang Schmitt, Gavin Ryan, Matthias E Möbius, Thorfinnur Gunnlaugsson
A heterotopic naphthalimide ligand N-(4-picolyl)-4-(4'-carboxyphenoxy)-1,8-naphthalimide HL is utilised for the formation of self-assembled soft materials. In the presence of K(+) ions, L(-) forms a robust photoluminescent hydrogel 1 which is reversible under thermal, mechanical or chemical stimuli.
May 17, 2017: Chemical Communications: Chem Comm
R Viswanath, H S Bhojya Naik, G Arun Kumar, I K Suresh Gowda, S Yallappa
Luminescence technology has been improved with the help of semiconductor nanoparticles that possess novel optical and electrical properties compared with their bulk counterpart. The aim of this study was to design semiconductor nanocrystals in their pure (ZnS) or doped form (ZnS:Mn) with different concentrations of Mn(2+) ions by a wet chemical route stabilized by ethylenediamine tetra-acetic acid (EDTA) and to evaluate their luminescence properties. The nanocrystals were characterized by physicochemical techniques such as X-ray diffraction (XRD), High-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SEAD), EDS, and ultraviolet (UV)-visible light and photoluminescence (PL) studies...
May 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
Luisa De Cola, Chien-Wei Hsu, Elena Longhi, Stephan Sinn, Chris Hawes Hawes, David Young, Paul Kruger
Electrochemiluminescence (ECL) based on [Ru(bpy)3]2+ systems is widely utilized for immunoassays. In order to extend the promising potential of ECL based applications, Ir(III) complexes have recently attracted attention as probes because of their excellent luminescent properties and tunable emission wavelength. Here we describe a series of Ir complexes using a large π-conjugated ligand and different ancillary chelates. The complexes synthesized have been chemically and spectroscopically characterized and used for ECL measurements with annihilation and co-reactant methods...
May 14, 2017: Chemistry, An Asian Journal
Roza R Alieva, Nadezhda S Kudryasheva
Nowadays, physicochemical approach to understanding toxic effects remains underdeveloped. A proper development of such mode would be concerned with simplest bioassay systems. Coelenteramide-Containing Fluorescent Proteins (CLM-CFPs) can serve as proper tools for study primary physicochemical processes in organisms under external exposures. CLM-CFPs are products of bioluminescent reactions of marine coelenterates. As opposed to Green Fluorescent Proteins, the CLM-CFPs are not widely applied in biomedical research, and their potential as colored biomarkers is undervalued now...
August 1, 2017: Talanta
Sicheng Xiong, Yaofeng Zhou, Xiaolin Huang, Ruijin Yu, Weihua Lai, Yonghua Xiong
Herein, for the first time we report a novel direct competitive fluorescence-linked immunosorbent assay (dcFLISA) for the ultrasensitive detection of ochratoxin A (OTA) by introducing a large size polymer beads loaded with quantum dots (QBs) as carrier of competing antigen for decreasing binding affinity to antibody and enhancing the fluorescent signal intensity. When using 255 nm QBs as carrier of competing antigen, the equilibrium dissociation constant of QB based competing antigen to antibodies can be tuned to 100 times higher than that of the horseradish peroxidase (HRP) based competing antigen by controlling labeled amounts of antigen on the surface of QBs...
June 15, 2017: Analytica Chimica Acta
Jixiang Wang, Yunyun Wang, Hao Qiu, Lin Sun, Xiaohui Dai, Jianming Pan, Yongsheng Yan
Fluorescent molecularly imprinted polymers have shown great promise in biological or chemical separations and detection, due to their high stability, selectivity and sensitivity. In this work, fluorescent molecularly imprinted microsphere was synthesized via precipitation polymerization, which could separate efficiently and rapidly detect τ-fluvalinate (a toxic insecticide) in water samples, was reported. The fluorescent imprinted sensor showed excellent stability, outstanding selectivity and the limit of detection low to 12...
May 9, 2017: Scientific Reports
Jie Dong, Hang Xu, Sheng-Li Hou, Zhi-Lei Wu, Bin Zhao
Two multifunctional metal-organic frameworks based on cubane-like tetrahedron Tb4 clusters as nodes have been synthesized and characterized. Compound 1 exhibits a 2D lanthanide-organic framework with Tb4 clusters as nodes, and compound 2 possesses a 3D framework with Tb4 clusters and Mn(2+) as nodes. Interestingly, luminescent investigations on them reveal that the two compounds can act as recyclable luminescent probes for chromium(VI) anion species and the corresponding detection limit can reach 10(-7) mol/L...
May 8, 2017: Inorganic Chemistry
Andrey A Knyazev, Maksim E Karyakin, Aleksandr S Krupin, Ksenia A Romanova, Yuriy G Galyametdinov
Europium(III) complexes that are the anisometric analogues of a well-known Eu(DBM)3Phen (DBM = dibenzoylmethane; Phen = 1,10-phenanthroline) complex were synthesized. Quantum-chemical calculations of the excited states of new Eu(III) complexes and some conjugated polymers showed that poly(N-vinylcarbazole) provides the most efficient energy transfer in polymer films doped with synthesized Eu(III) complexes. These new composite films were prepared, and their luminescence properties were studied. The results of experimental data confirmed theoretical prediction about significant influence introduced in molecular structure long terminal alkyl chains and cyclohexane on the luminescence efficiency of "Ln(III)-polymer" composite...
May 8, 2017: Inorganic Chemistry
Feng Zhang, Hua Yao, Tianshu Chu, Gaowei Zhang, Yi Wang, Yangyi Yang
Nitrofurans are a group of widely used veterinary antibiotics which have been forbidden due to antibiotics pollution. Development of a rapid and effective method for the detection of nitrofuran antibiotics (NFAs) are very important but challenging. Herein, we designed a chemical sensor based on a lanthanide metal-organic framework (Ln-MOF) thin film of {[Eu2(BCA)3(H2O)(DMF)3]·0.5DMF·H2O}n (Eu-BCA, where BCA is 2,2'-biquinoline-4,4'-dicarboxylate) fabricated on the cost-effective stainless steel wire mesh (SSWM) by Co3O4 nano-anchors fixation method...
May 4, 2017: Chemistry: a European Journal
Eva Toth, Sara Lacerda
Lanthanide complexes have attracted continuous attention in the biomedical field and today various imaging applications make use of their versatile magnetic and luminescence properties. In this minireview, we give insights into the mechanistic aspects that allow modulating the relaxation or chemical exchange saturation transfer (CEST) features, thus the MRI efficiency of paramagnetic lanthanide chelates in order to create agents that are capable of providing an MRI response as a function of a specific biomarker...
May 4, 2017: ChemMedChem
Dik-Lung Ma, Zhen-Zhen Dong, Kasipandi Vellaisamy, Ka-Man Cheung, Guanjun Yang, Chung-Hang Leung
By catalyzing highly specific and tightly controlled chemical reactions, enzymes are essential to maintaining normal cellular physiology. However, aberrant enzymatic activity can be linked to the pathogenesis of various diseases. Therefore, the unusual activity of particular enzymes can represent testable biomarkers for the diagnosis or screening of certain diseases. In recent years, G-quadruplex-based platforms have attracted wide attention for the monitoring of enzymatic activities. In this Personal Account, we discuss our group's works on the development of G-quadruplex-based sensing system for enzyme activities by using mainly iridium(III) complexes as luminescent label-free probes...
May 3, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
William P Lustig, Soumya Mukherjee, Nathan D Rudd, Aamod V Desai, Jing Li, Sujit K Ghosh
Metal-organic frameworks (MOFs) or porous coordination polymers (PCPs) are open, crystalline supramolecular coordination architectures with porous facets. These chemically tailorable framework materials are the subject of intense and expansive research, and are particularly relevant in the fields of sensory materials and device engineering. As the subfield of MOF-based sensing has developed, many diverse chemical functionalities have been carefully and rationally implanted into the coordination nanospace of MOF materials...
May 2, 2017: Chemical Society Reviews
Kota Takahashi, Satoru Ito, Kishio Furuya, Shuichi Asano, Masahiro Sokabe, Yoshinori Hasegawa
Extracellular adenosine 5'-triphosphate (ATP) acts as an inflammatory mediator of pulmonary fibrosis. We investigated the effects of mechanical and chemical stimuli on ATP release from primary normal human lung fibroblasts. We visualized the ATP release from fibroblasts in real time using a luminescence imaging system while acquiring differential interference contrast cell images with infrared optics. Immediately following a single uniaxial stretch for 1s, ATP was released from a certain population of cells and spread to surrounding spaces...
April 23, 2017: Respiratory Physiology & Neurobiology
Zhiguo Xia, Kenneth R Poeppelmeier
Adaptable crystalline frameworks are important in modern solid-state chemistry as they are able to accommodate a wide range of elements, oxidation states, and stoichiometries. Owing to this ability, such adaptable framework structures are emerging as the prototypes for technologically important advanced functional materials. In this Account, the idea of cosubstitution is explored as a useful "pairing" concept that can potentially lead to the creation of many new members of one particular framework structure...
April 25, 2017: Accounts of Chemical Research
Ruslan Álvarez-Diduk, Jahir Orozco, Arben Merkoçi
Simple, inexpensive and rapid sensing systems are very demanded for a myriad of uses. Intrinsic properties of emerging paper-based analytical devices have demonstrated considerable potential to fulfill such demand. This work reports an easy-to-use, low cost, and disposable paper-based sensing device for rapid chemical screening with a smartphone readout. The device comprises luminescent graphene quantum dots (GQDs) sensing probes embedded into a nitrocellulose matrix where the resonance energy transfer phenomenon seems to be the sensing mechanism...
April 20, 2017: Scientific Reports
Kinga Gazda, Michal Bazała, Tomasz Węgierski
Calcium is a second messenger that plays a key role in various cellular processes. Monitoring calcium levels is a prerequisite to their understanding. The first calcium indicators for microscopy were the luminescent protein aequorin and chemical probes. These indicators, however, have serious drawbacks, limiting their use in many types of experiments. Cloning of cDNA for the A. victoria GFP and creation of its first spectral variants has initiated the development of fluorescent, genetically encoded calcium indicators (GECI)...
2017: Postepy Biochemii
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"