journal
MENU ▼
Read by QxMD icon Read
search

Luminescence: the Journal of Biological and Chemical Luminescence

journal
https://www.readbyqxmd.com/read/28929575/development-of-an-optical-sensor-for-chlortetracycline-detection-based-on-the-fluorescence-quenching-of-l-tryptophan
#1
Hui Zhang, Hongyun Chen, Shuang Pan, Huan Yang, Jingjing Yan, Xiaoli Hu
A simple and selective spectrofluorimetric method for the detection of chlortetracycline (CTC) was studied. In pH 7.4 buffer medium l-tryptophan (l-Trp), applied as the fluorescence probe, interacted with CTC resulting in fluorescence quenching of the probe. CTC was detected with maximum excitation and emission wavelengths at λex /λem  = 275/350 nm. Notably, quenching of fluorescence intensities was positively proportional to the CTC concentration over the range of 0.65-30 μmol L(-1) and the limit of detection was 0...
September 20, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28929569/evaluation-of-chemical-chaperones-based-on-the-monitoring-of-bip-promoter-activity-and-visualization-of-extracellular-vesicles-by-real-time-bioluminescence-imaging
#2
Tomohisa Horibe, Nanako Okushima, Aya Torisawa, Ryutaro Akiyoshi, Yoko Hatta-Ohashi, Hirobumi Suzuki, Koji Kawakami
It is known that endoplasmic reticulum (ER) stress in cells and extracellular vesicles (EVs) plays a significant role in cancer cells, therefore the evaluation of compounds that can regulate ER stress and EV secretion would be a suitable system for further screening and development of new drugs. In this study, we evaluated chemical chaperones derived from natural products based on monitoring Bip/GRP78 promoter activity during cancer cell growth, at the level of the single cell, by a bioluminescence microscopy system that had several advantages compared with fluorescence imaging...
September 20, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28929568/a-selective-and-sensitive-fluorescent-sensor-for-cysteine-detection-based-on-bi-8-carboxamidoquinoline-derivative-and-cu-2-complex
#3
Guoping Chai, Qingwen Liu, Qiang Fei, Jinling Zhang, Xiaoxiao Sun, Hongyan Shan, Guodong Feng, Yanfu Huan
In this paper, a novel fluorescent sensor 1 for selective and sensitive detection of cysteine was developed based on a complex between bi-8-carboxamidoquinoline derivative ligand (L) and Cu(2+) . The interaction of Cu(2+) with the ligand causes a dramatic fluorescence quenching most likely due to its high affinity towards Cu(2+) and a ligand-metal charge transfer (LMCT) process. The in situ generated L-Cu(2) complex was utilized as a chemosensing ensemble for cysteine. In the presence of cysteine, the fluorophore, L, was released from L-Cu(2) complex because of the strong affinity of cysteine to Cu(2+) via the Cu-S bond, leading to the fluorescence recovery of the ligand...
September 20, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28929579/in-situ-biosensor-for-detection-mirna-in-living-cells-based-on-carbon-nitride-nanosheets-with-catalytic-hairpin-assembly-amplification
#4
Xianjiu Liao, Liqing Li, Jianbin Pan, Tingting Peng, Bin Ge, Qianli Tang
In this study, an ultrasensitive fluorescence turn-on assay for in situ sensing of intracellular microRNA (miRNA) was developed utilizing a carbon nitride nanosheet (CNNS) and a catalytic hairpin assembly (CHA). The CHA showed favourable signal amplification for low-level biomarkers, and CNNS was an excellent candidate as a fluorescence quencher and gene vector. Moreover, the hairpin DNA of CHA could be adsorbed onto the surface of CNNS. An enzyme-free fluorescence biosensor for ultrasensitive sensing of intracellular miRNA in cells based on CHA and CNNS was designed...
September 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28914481/boron-and-nitrogen-co-doped-carbon-dots-as-a-sensitive-fluorescent-probe-for-the-detection-of-curcumin
#5
Wei Bian, Xuan Wang, Yakun Wang, Haifen Yang, Jialin Huang, Zongwei Cai, Martin M F Choi
In this present study, a fluorescent probe was developed to detect curcumin, which is derived from the rhizomes of the turmeric. We used a simple and economical way to synthesize boron and nitrogen co-doped carbon dots (BNCDs) by microwave heating. The maximum emission wavelength of the BNCDs was 450 nm at an excitation wavelength of 360 nm. The as-prepared BNCDs were characterized by multiple analytical techniques such as transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and infrared spectroscopy...
September 15, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28905512/comparison-of-molecular-interactions-of-ag2-te-and-cdte-quantum-dots-with-human-serum-albumin-by-spectroscopic-approaches
#6
Qi Xiao, Yu Liang, Yi Liu, Shuangyan Lu, Shan Huang
Ag2 Te quantum dots (QDs) have attracted great attention in biological applications due to their superior photoluminescence qualities and good biocompatibility, but their potential biotoxicity at a molecular biology level has been rarely discussed. In order to better understand the basic behavior of Ag2 Te QDs in biological systems and compare their biotoxicity to cadmium-containing QDs, a series of spectroscopic measurements was applied to reveal the molecular interactions of Ag2 Te QDs and CdTe QDs with human serum albumin (HSA)...
September 14, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28884966/enhancement-of-the-luminescence-properties-of-sr3-po4-2-dy-3-li-white-light-emitting-phosphors-by-charge-compensator-li-co-doping
#7
Yuhang Li, Siyi Dai, Wentao Zhang, Peicong Zhang, Kehui Qiu
Sr3 (PO4 )2 :Dy(3+) ,Li(+) phosphors were prepared using a simple high temperature solid method for luminescence enhancement. The structures of the as-prepared samples agreed well with the standard phase of Sr3 (PO4 )2 , even when Dy(3+) and Li(+) were introduced. Under ultraviolet excitation at 350 nm, the Sr3 (PO4 )2 :Dy(3+) sample exhibited two emission peaks at 483 nm and 580 nm, which were due to the (4) F9/2  → (6) H15/2 and (4) F9/2  → (6) H13/2 transitions of Dy(3+) ions, respectively. A white light was fabricated using these two emissions from the Sr3 (PO4 )2 :Dy(3+) phosphors...
September 8, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28880436/redox-luminescence-switch-based-on-mn-2-doped-nayf4-yb-er-upconversion-nanorods
#8
Liping Zhang, Jianguo Zhang, Hongqi Chen, Lun Wang
An redox luminescence switch was developed for the sensing of glutathione (GSH), l-cysteine (Cys) or l-ascorbic acid (AA) based on redox reaction. The Mn(2+) -doped NaYF4 :Yb,Er upconversion nanorods (UCNRs) with an emission peak located in the red region were synthesized. The luminescence intensity of the UCNRs could be quenched due to the Mn(2+) could be oxidized to MnO2 by KMnO4 . Subsequently, when the AA, GSH or Cys was added into the MnO2 modified upconversion nanosystem, which could reduced MnO2 to Mn(2+) and the luminescence intensity was recovered...
September 7, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28856794/rapid-and-sensitive-colorimetric-detection-of-ascorbic-acid-in-food-based-on-the-intrinsic-oxidase-like-activity-of-mno2-nanosheets
#9
Liuying He, Feiyang Wang, Ying Chen, Yueying Liu
In this paper, we report a colorimetric sensor for the rapid, selective detection of ascorbic acid (AA) in aqueous solutions. Single-layered MnO2 nanosheets were established as an artificial oxidase; consequently colorless 3,3´,5,5´-tetramethylbenzidine (TMB) was oxidized to a blue product (oxTMB), with increase in absorbance at 650 nm. The absorbance of the reaction system decreased after introduction AA, which reduced MnO2 into Mn(2+) . Under optimum conditions, a detection limit of 62.81 nM for AA in aqueous solutions could be achieved...
August 30, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28853233/terbium-iii-coordination-polymer-copper-ii-compound-as-fluorescent-probe-for-time-resolved-fluorescence-turn-on-detection-of-hydrogen-sulfide
#10
Lili Chen, Hongliang Tan, Fugang Xu, Li Wang
With recognition of the biological importance of hydrogen sulfide (H2 S), we present a simple and effective fluorescent probe for H2 S using a Tb(3+) coordination polymer-Cu(2+) compound (DPA/Tb/G-Cu(2+) ). Dipicolinic acid (DPA) and guanosine (G) can coordinate with Tb(3+) to form a macromolecular coordination polymer (DPA/Tb/G). DPA/Tb/G specifically binds to Cu(2+) in the presence of coexisting cations, and obvious fluorescence quenching is observed. The quenched fluorescence can be exclusively recovered upon the addition of sulfide, which is measured in the mode of time-resolved fluorescence...
August 29, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28816405/synthesis-density-functional-theory-calculations-and-luminescence-of-lanthanide-complexes-with-2-6-bis-3-methoxybenzylidene-hydrazinocarbonyl-pyridine-schiff-base-ligand
#11
Ziyad A Taha, Taher S Ababneh, Ahmed K Hijazi, Qutaiba Abu-Salem, Abdulaziz M Ajlouni, Shroq Ebwany
A pyridine-diacylhydrazone Schiff base ligand, L = 2,6-bis[(3-methoxy benzylidene)hydrazinocarbonyl]pyridine was prepared and characterized by single crystal X-ray diffraction. Lanthanide complexes, Ln-L, {[LnL(NO3 )2 ]NO3 .xH2 O (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Er)} were prepared and characterized by elemental analysis, molar conductance, thermal analysis (TGA/DTGA), mass spectrometry (MS), Fourier transform infra-red (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. Ln-L complexes are isostructural with four binding sites provided by two nitro groups along with four coordination sites for L...
August 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28816400/silica-modified-luminescent-lapo4-eu-lapo4-sio2-core-shell-nanorods-synthesis-structural-and-luminescent-properties
#12
Anees A Ansari
Monoclinic-type tetragonal LaPO4 :Eu (core) and LaPO4 :Eu@LaPO4 (core/shell) nanorods (NRs) were successfully prepared using a urea-based co-precipitation process under ambient conditions. An amorphous silica layer was coated around the luminescent core/shell NRs via the sol-gel process to improve their solubility and colloidal stability in aqueous and non-aqueous media. The prepared nano-products were systematically characterized by X-ray diffraction pattern, transmission electron microscopy, energy dispersive X-ray analysis, and FTIR, UV/Vis, and photoluminescence spectroscopy to examine their phase purity, crystal phase, surface chemistry, solubility and luminescence characteristics...
August 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28816399/preliminary-results-on-the-photoluminescence-and-optically-stimulated-luminescence-in-cu-doped-and-ag-doped-znb2-x4-b%C3%A2-%C3%A2-li-na-k-x%C3%A2-%C3%A2-cl-br-compounds
#13
Milind Jog, Rajesh Patil, Yogesh More, Mukund Kulkarni, Sanjiv Moharil
Photoluminescence, and optically stimulated luminescence in ZnB2 X4 (B; Li,Na,K: X; Cl,Br) compounds doped with Cu(+) or Ag(+) were studied. Double humped emission bands attributable to the activators were observed in all the samples. The observed photoluminescence of Cu(+) and Ag(+) could be identified with 3d(9) 4s(1) ↔3d(10) and 4d(9) 5s(1) ↔5d(10) transitions respectively. The longer wavelength band (400-500 nm range) could be attributed to the Cu(+) or Ag(+) ion replacing alkali ion at the octahedral alkali site whereas short wavelength band (340-400 nm range) is attributed to a Cu or Ag ion at tetrahedral zinc site...
August 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28799722/a-sensitive-surface-enhanced-raman-scattering-method-for-chondroitin-sulfate-with-victoria-blue-4r-molecular-probes-in-nanogold-sol-substrate
#14
Yanghe Luo, Xiaoliang Wang, Qingye Liu, Aihui Liang, Xingcun He, Zhiliang Jiang
Using silver nanoparticles (AgNPs) as the nanocatalyst, l-cysteine rapidly reduced HAuCl4 to make a stable gold nanoparticle sol (Ag/AuNP) that had a high surface-enhanced Raman scattering (SERS) activity in the presence of Victoria blue 4R (VB4r) molecular probes. Under the selected conditions, chondroitin sulfate (Chs) reacted with the VB4r probes to form associated complexes that caused the SERS effect to decrease to 1618 cm(-1) . The decreased SERS intensity was linear to the Chs concentration in the range 3...
August 11, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28786552/effect-of-erbium-ion-concentration-on-structural-and-luminescence-properties-of-lead-borosilicate-glasses-for-fiber-amplifiers
#15
Midde Reddi Babu, N Madhusudhana Rao, A Mohan Babu
This investigation reports, the effect of the concentration of erbium and lead ions on the physical, structural and optical properties of lead borosilicate glasses. These glasses were synthesized by the melt quench method. In the synthesis, the concentration of the erbium (Er(3+) ) ion was varied in the order of 0.0, 0.1, 0.5, 1.0 and 2.0 mol% and lead (Pb(2+) ) ion was varied in the order of 30, 29.9, 29.5, 29 and 28 mol%. The glasses were analyzed using X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and UV-vis-NIR spectroscopy...
August 8, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28776941/ratiometric-fluorescence-detection-of-superoxide-anion-based-on-aunps-bsa-tb-gmp-nanoscale-coordination-polymers
#16
Nan Liu, Juan Hao, Keying Cai, Mulan Zeng, Zhenzhong Huang, Lili Chen, Bingxian Peng, Ping Li, Li Wang, Yonghai Song
A novel ratiometric fluorescence nanosensor for superoxide anion (O2(•-) ) detection was designed with gold nanoparticles-bovine serum albumin (AuNPs-BSA)@terbium/guanosine monophosphate disodium (Tb/GMP) nanoscale coordination polymers (NCPs) (AuNPs-BSA@Tb/GMP NCPs). The abundant hydroxyl and amino groups of AuNPs-BSA acted as binding points for the self-assembly of Tb(3+) and GMP to form core-shell AuNPs-BSA@Tb/GMP NCP nanosensors. The obtained probe exhibited the characteristic fluorescence emission of both AuNPs-BSA and Tb/GMP NCPs...
August 3, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28762668/luminescent-properties-of-single-phase-ba2-x-1-5y-1-5z-p2-o7-xeu-2-yce-3-ztb-3-phosphors-for-white-light-emitting-diode
#17
Sha-Sha Liu, Da-Chuan Zhu, Cong Zhao, Tao Han
A series of Ba2 P2 O7 :xEu(2+) ,yCe(3+) ,zTb(3+) phosphors was synthesized via a co-precipitation method, then their crystal structure, quantum efficiency and luminescent properties were analyzed by XRD and FL, respectively. The results showed that these phosphors not only presented the excitation characteristics of Ba2 P2 O7 :xEu(2+) ,zTb(3+) , but also exhibited that of the Ba2 P2 O7 :yCe(3+) ,zTb(3+) phosphor. Meanwhile, the tri-doped phosphor showed a stronger absorption around 320 nm in contrast with the Eu(2+) /Ce(3+) :Tb(3+) co-doped phosphor...
August 1, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28752574/improved-sensitivity-of-firefly-luminescent-intermediate-based-protein-interaction-assay-using-ser-440-mutant-with-lower-adenylation-activity
#18
Yuki Ohmuro-Matsuyama, Takahiro Yamashita, Huan Lin, Hideki Yamaji, Hiroshi Ueda
Protein-protein interaction assays are important in various fields including molecular biology, diagnostics, and drug screening. We recently designed a novel protein-protein interaction assay, the firefly luminescent intermediate-based protein interaction assay (FlimPIA), that exploited the unique reaction mechanism of firefly luciferase (Fluc). Using two mutant Flucs, each impaired with one of the two half-reactions, namely adenylation and subsequent oxidative luminescent steps, FlimPIA detects the proximity of the two proteins tethered to the mutant Flucs...
July 28, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28745001/investigation-of-the-interaction-of-aurantio-obtusin-with-human-serum-albumin-by-spectroscopic-and-molecular-docking-methods
#19
Jianming Liu, Xuyang Yan, Yuanyuan Yue, Shufang Zhao
The interaction between human serum albumin (HSA) and aurantio-obtusin was investigated by spectroscopic techniques combined with molecular docking. The Stern-Volmer quenching constants (KSV ) decreased from 8.56 × 10(5)  M(-1) to 5.13 × 10(5)  M(-1) with a rise in temperatures from 289 to 310 K, indicating that aurantio-obtusin produced a static quenching of the intrinsic fluorescence of HSA. Time-resolved fluorescence studies proved again that the static quenching mechanism was involved in the interaction...
July 26, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28719145/preparation-of-carbon-dot-based-ratiometric-fluorescent-probes-for-cellular-imaging-from-curcuma-longa
#20
Zihnil Adha Islamy Mazrad, Eun Bi Kang, Insik In, Sung Young Park
This work derived biocompatible and stable probes based on fluorescent nanoparticles (FNPs) from a natural source, Curcuma longa. The multi-color fluorescence emissions from carbonized Curcuma longa (C-FNPs) obtained through defined dehydration conditions are soluble in water and have a small particle size (~17 nm). The surface passivation with polyethylene glycol (PEG) capped with amine groups in FNPs (P-FNPs) generated a probe with a higher quantum yield and longer fluorescence lifetime than obtained with C-FNPs...
July 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
journal
journal
34708
1
2
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"