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https://www.readbyqxmd.com/read/29454254/exploration-research-on-synthesis-and-application-of-a-new-dye-containing-di-2-picolyamine
#1
Huihui Zhang, Zeyue Wei, Ying Xia, Min Fang, Weiju Zhu, Xingyuan Yang, Fei Li, Yupeng Tian, Xuanjun Zhang, Hongping Zhou
A newly designed fluorescence dye L based on di-2-picolyamine (DPA) moiety as a chelator was obtained under the protection of N 2 at 120°C, and KI as catalyst with relatively better yield. More interestingly, L not only could selectively and sensitively detect Cu 2+ ions in aqueous medium but also examine the Cu 2+ ions of the actual water samples. Nevertheless, L could be visual in Hela cells with excellent cell permeability, viz, monitoring exogenous Cu 2+ ions as well as realizing an "on-off-on" process...
February 9, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29453613/in-vitro-antioxidant-and-cytotoxic-activities-of-18-plants-from-the-erkowit-region-eastern-sudan
#2
Manar Adam, Gihan O M Elhassan, Sakina Yagi, Fatma Sezer Senol, Ilkay Erdogan Orhan, Abdel Azim Ahmed, Thomas Efferth
We investigated the antioxidant potential and cytotoxicity towards human CCRF-CEM leukemia cells of 57 extracts obtained from 18 plants collected in the Erkowit region, eastern Sudan. The antioxidant activity was determined by measuring the radical scavenging effects against 2,2-diphenyl-1-picrylhydrazyl (DPPH) and N,N-dimethyl-p-phenylendiamine (DMPD), metal-chelation capacity, ferric-reducing (FRAP) and phosphomolibdenum-reducing antioxidant power (PRAP) methods using ELISA microtiter assays. Total phenol and flavonoid amounts of the extracts were determined spectrophotometrically...
February 16, 2018: Natural Products and Bioprospecting
https://www.readbyqxmd.com/read/29453179/enhanced-cr-vi-removal-from-acidic-solutions-using-biochar-modified-by-fe-3-o-4-sio-2-nh-2-particles
#3
Shunquan Shi, Jiakuan Yang, Sha Liang, Mingyang Li, Quan Gan, Keke Xiao, Jingping Hu
Fe 3 O 4 @SiO 2 -NH 2 magnetic particles with core-shell structure were attached on carboxylated biochar derived from phoenix tree leaves to synthesize a novel magnetic biochar for removing Cr(VI) ions from acidic solutions. FSEM, FTEM, XRD characterizations of the synthesized magnetic biochar revealed that the Fe 3 O 4 @SiO 2 -NH 2 magnetic particles distributed uniformly on the surface or macrospores of carboxylated biochar by strong chemical bonding. The Cr(VI) ions adsorption capacity of magnetic biochar was 27...
February 13, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29453030/effects-of-triphenyltin-on-glycinergic-transmission-on-rat-spinal-neurons
#4
Kazuki Noma, Hironari Akaike, Yuki Kurauchi, Hiroshi Katsuki, Yasuo Oyama, Norio Akaike
Glycine is a fast inhibitory transmitter like γ-aminobutyric acid in the mammalian spinal cord and brainstem, and it is involved in motor reflex, nociception, and neuronal development. Triphenyltin (TPT) is an organometallic compound causing environmental hazard to many wild creatures. Our previous findings show that TPT ultimately induces a drain and/or exhaustion of glutamate in excitatory presynaptic nerve terminals, resulted in blockage of neurotransmission as well as methylmercury. Therefore, we have investigated the neurotoxic mechanism how TPT modulates inhibitory glycinergic transmission in the synaptic bouton preparation of rat isolated spinal neurons using a patch clamp technique...
February 13, 2018: Environmental Research
https://www.readbyqxmd.com/read/29452354/alpha-synuclein-inhibits-snx3-retromer-mediated-retrograde-recycling-of-iron-transporters-in-s-cerevisiae-and-c-elegans-models-of-parkinson-s-disease
#5
Dhaval Patel, Chuan Xu, Sureshbabu Nagarajan, Zhengchang Liu, Wayne O Hemphill, Runhua Shi, Vladimir N Uversky, Guy A Caldwell, Kim A Caldwell, Stephan N Witt
We probed the role of alpha-synuclein (α-syn) in modulating sorting nexin 3 (Snx3)-retromer-mediated recycling of iron transporters in Saccharomyces cerevisiae and Caenorhabditis elegans. In yeast, the membrane-bound heterodimer Fet3/Ftr1 is the high affinity iron importer. Fet3 is a membrane-bound multicopper ferroxidase, whose ferroxidase domain is orthologous to human ceruloplasmin (Cp), that oxidizes external Fe+2 to Fe+3; the Fe+3 ions then channel through the Ftr1 permease into the cell. When the concentration of external iron is low (< 1 µM), Fet3/Ftr1 is maintained on the plasma membrane by retrograde endocytic-recycling; whereas, when the concentration of external iron is high (> 10 µM), Fet3/Ftr1 is endocytosed and shunted to the vacuole for degradation...
February 14, 2018: Human Molecular Genetics
https://www.readbyqxmd.com/read/29451813/modulatory-effects-of-alkaloid-extract-from-gongronema-latifolium-utazi-and-lasianthera-africana-editan-on-activities-of-enzymes-relevant-to-neurodegeneration
#6
Esther E Nwanna, Adeniyi A Adebayo, Ganiyu Oboh, Opeyemi B Ogunsuyi, Ayokunle O Ademosun
Most alkaloids are produced by plants as a defense mechanism against herbivores. Since alkaloids are known to possess pharmacological effects, this study sought to investigate the in vitro modulatory effect of alkaloid obtained from two commonly consumed vegetables in southern Nigeria, Lasianthera africana (editan) and Gongronema latifolium (utazi), on some enzyme activities relevant to neurodegeneration. Effects of the alkaloids on cholinesterases (acetylcholinesterase [AChE] and butyrylcholinesterase [BChE]) and monoamine oxidase (MAO) activities were determined in vitro...
February 16, 2018: Journal of Dietary Supplements
https://www.readbyqxmd.com/read/29451651/demetallization-of-enterococcus-faecalis-biofilm-a-preliminary-study
#7
Carlos Estrela, Rodrigo Costa E Silva, Roberta Cerasi Urban, Pablo José Gonçalves, Júlio A Silva, Cyntia R A Estrela, Jesus Djalma Pecora, Ove A Peters
Objectives To determine the concentration of calcium, iron, manganese and zinc ions after the application of chelator to Enterococcus faecalis biofilms. Material and Methods Fifty bovine maxillary central incisors were prepared and inoculated with E. faecalis for 60 days. The following were used as irrigation solutions: 17% EDTA (pH 3, 7 and 10), 2.5% sodium hypochlorite (NaOCl) combined with 17% EDTA (pH 3, 7 and 10), distilled water (pH 3, 7 and 10), and 2.5% NaOCl. Each solution was kept in the root canal for five minutes...
2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29451575/functionalized-cu-3-bis-3-nanoparticles-for-dual-modal-imaging-and-targeted-photothermal-photodynamic-therapy
#8
Yanke Wang, Dongdong Cai, Huixia Wu, Yu Fu, Yang Cao, Yingjian Zhang, Dongmei Wu, Qiwei Tian, Shiping Yang
Multifunctional nano-biomaterials with the integration of diagnostic and therapeutic functions have shown great promise in improving the efficacy of cancer therapy. Herein, a new nanoplatform based on functionalized Cu 3 BiS 3 nanoparticles (NPs) is fabricated for tumour-targeted combination phototherapy. The as-synthesized hydrophobic Cu 3 BiS 3 NPs are modified with DSPE-PEG/DSPE-PEG-NH 2 , followed by the conjugation of the photosensitizer chlorin e6 (Ce6) and the target ligand folic acid (FA). The introduced Ce6 can further form a chelate complex with Gd 3+ ...
February 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29451345/unsymmetrical-cyclic-diborenes-and-thermal-rearrangement-to-a-borylborylene
#9
Tom Stennett, James Mattock, Ivonne Vollert, Alfredo Vargas, Holger Braunschweig
Cyclic diboranes(4) based on a chelating monoanionic benzylphosphine linker were prepared by boron-silicon exchange between arylsilanes and B2Br4. Coordination of Lewis bases to the remaining sp2 boron atom yielded unsymmetrical sp3-sp3 diboranes, which were reduced with KC8 to their corresponding trans-diborenes. These compounds were studied by a combination of spectroscopic methods, X-ray diffraction and DFT calculations. PMe3-stabilized diborene 6 was found to undergo thermal rearrangement to gem-diborene 8...
February 16, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29451227/statural-growth-and-prevalence-of-endocrinopathies-in-relation-to-liver-iron-content-lic-in-adult-patients-with-beta-thalassemia-major-btm-and-sickle-cell-disease-scd
#10
Mohamed A Yassin, Ashraf T Soliman, Vincenzo De Sanctis, Mohammad Aj Abdula, Lubna M Riaz, Firdous F Ghori, Anil Yousaf, Abdulqadir J Nashwan, Sandara Abusamaan, Abbas Moustafa, Samah Kohla, Dina S Soliman
Despite regular blood transfusion and iron chelation therapy, growth impairment and pubertal delay are commonly seen in children and adolescents with transfusion-dependent Beta thalassaemia major (BTM) and sickle cell disease (SCD). We evaluated growth parameters and endocrine disorders in relation to the liver iron concentration (LIC) assessed by the Ferriscan® method in a cohort of adults with SCD (n =40) and BTM (n = 52) receiving blood transfusions and iron chelation therapy since early childhood. Before transfusion, hemoglobin concentration had not been less than 9 g/dl in the past 12 years; subcutaneous daily desferrioxamine was administered for all of them since early childhood (2- 5 years of age)...
February 16, 2018: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/29451226/final-adult-height-and-endocrine-complications-in-young-adults-with-%C3%AE-thalassemia-major-tm-who-received-oral-iron-chelation-oic-in-comparison-with-those-who-did-not-use-oic
#11
Ashraf T Soliman, Mohamed A Yassin, Vincenzo De Sanctis
BACKGROUND: Relatively little is known about endocrine function, bone mineral health, and growth during oral iron chelation therapy in β-thalassemia major patients (TM) on treatment with deferasirox. AIMS OF THE STUDY: To study the frequency of endocrine complications, IGF-1 levels and final adult standing height (FA-Ht) in patients with BTM in two groups of adult patients. PATIENTS AND METHODS: The first group (Group A; 15 patients, 6 females and 9 males) received oral iron chelation therapy (OIC) with deferasirox for 6 years before puberty; the second group (Group B;40 patients) attained the FA-Ht before the use of OIC (iron chelation therapy with deferoxamine (DFO) given subcutaneously, since the age of 2 years)...
February 16, 2018: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/29451224/hypogonadism-in-male-thalassemia-major-patients-pathophysiology-diagnosis-and-treatment
#12
Vincenzo De Sanctis, Ashraf T Soliman, Mohamed A Yassin, Salvatore Di Maio, Shahina Daar, Heba Elsedfy, Nada Soliman, Christos Kattamis
Failure of pubertal growth, delay or absence of sexual development, infertility and sexual dysfunction due to hypogonadism and defective spermatogenesis are frequent and well recognized disturbances among male patients with transfusion dependent (TD) thalassaemia major (β-thal). These problems are attributed mainly to the damage caused by chronic anaemia and the deposition of excess iron in the pituitary gland and testicles. This is a short review of male pubertal disorders in patients with β-thal written by pediatric endocrinologists and haematologists with an interest and active involvement, in the diagnosis and management of these complications in this group of patients...
February 16, 2018: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/29450660/protein-nutritional-value-polyphenols-and-antioxidant-properties-of-corn-fermented-with-agaricus-brasiliensis-and-agaricus-bisporus
#13
Fei-Hong Zhai, Hong-Yan Liu, Jian-Rong Han
Solid-state fermentation (SSF) with Agaricus brasiliensis and Agaricus bisporus on corn was carried out. The results showed that SSF with the two fungi made up the deficiency of tryptophan in corn and improved the protein nutritional value of corn. The conjugated polyphenols contents in fermented corn decreased and free polyphenols (FPP) contents increased. FPP contents in corn fermented with the two fungi reached respectively 25 and 88 times of control, total polyohenols contents reached respectively 1.4 and 3...
February 15, 2018: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/29449563/cinacalcet-mediated-activation-of-the-camkk%C3%AE-lkb1-ampk-pathway-attenuates-diabetic-nephropathy-in-db-db-mice-by-modulation-of-apoptosis-and-autophagy
#14
Ji Hee Lim, Hyung Wook Kim, Min Young Kim, Tae Woo Kim, Eun Nim Kim, Yaeni Kim, Sungjin Chung, Young Soo Kim, Bum Soon Choi, Yong-Soo Kim, Yoon Sik Chang, Hye Won Kim, Cheol Whee Park
Apoptosis and autophagy are harmoniously regulated biological processes for maintaining tissue homeostasis. AMP-activated protein kinase (AMPK) functions as a metabolic sensor to coordinate cellular survival and function in various organs, including the kidney. We investigated the renoprotective effects of cinacalcet in high-glucose treated human glomerular endothelial cells (HGECs), murine podocytes and C57BLKS/J-db/db mice. In cultured HGECs and podocytes, cinacalcet decreased oxidative stress and apoptosis and increased autophagy that were attributed to the increment of intracellular Ca 2+ concentration and the phosphorylation of Ca 2+ /calmodulin-dependent protein kinase kinaseβ (CaMKKβ)-Liver kinase B1 (LKB1)-AMPK and their downstream signals including the phosphorylation of endothelial nitric oxide synthase (eNOS) and increases in superoxide dismutases and B cell leukemia/lymphoma 2/BCL-2-associated X protein expression...
February 15, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29449447/tracers-for-fluorescence-guided-surgery-how-elongation-of-the-polymethine-chain-in-cyanine-dyes-alters-the-pharmacokinetics-of-a-bimodal-c-rgdyk-tracer
#15
Tessa Buckle, Danny M van Willigen, Silvia J Spa, Albertus W Hensbergen, Steffen van der Wal, Clarize M de Korne, Mick M Welling, Henk G van der Poel, James C H Hardwick, Fijs W B van Leeuwen
Objectives: The potential of (receptor-mediated) fluorescence-based image-guided surgery tracers is generally linked to the near-infrared emission profile and good manufacturing production (GMP) availability of fluorescent dyes. Surprisingly, little is known about the critical interaction between the structural composition of the dye and the pharmacokinetics of the tracers. In this study, a bimodal/hybrid tracer design was used to systematically and quantitatively evaluate the influence of elongation of the polymethine chain in a fluorescent cyanine (Cy) dye on the imaging potential of a targeted (RGD-based) tracer...
February 15, 2018: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29447973/extraction-purification-and-antioxidation-of-a-polysaccharide-from-fritillaria-unibracteata-var-wabuensis
#16
Feng Pan, Tian-Jiao Su, Yang Liu, Kai Hou, Chen Chen, Wei Wu
Rich polysaccharides were directly observed in the bulbs of Fritillaria unibracteata var. wabuensis (FUW) using the periodic acid-Schiff (PAS) method and microexamination. An acidic water-soluble heteropolysaccharide (FWPS1-1) was isolated from FUW through ethanol precipitation, decoloration, deproteinization, dialysis and separation using a DE-52 anion-exchange column and a Sepharose G-150 gel filtration column. FWPS1-1 (Mw: ~7.44 kDa) has many branches and long side chains; holds the triple-helix conformation; was composed of mannose (Man), galacturonic acid (GalA), galactose (Gal), xylose (Xyl) and arabinose (Ara) with a molar ratio of 2...
February 12, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29447072/construction-and-structure-studies-of-dna-bipyridine-complexes-as-versatile-scaffolds-for-site-specific-incorporation-of-metal-ions-into-dna
#17
Rui Wang, Srivathsan V Ranganathan, Phensinee Haruehanroengra, Song Mao, Matteo Scalabrin, Daniele Fabris, Alan Chen, Hehua Liu, Abdalla E A Hassan, Jianhua Gan, Jia Sheng
The facile construction of metal-DNA complexes by using 'Click' reactions is reported here. A series of 2'-propargyl-modified DNA oligonucleotides were initially synthesized as structure scaffolds and were then modified through 'Click' reaction to incorporate a bipyridine ligand equipped with an azido group. These metal chelating ligands can be placed in the DNA context in site-specific fashion to provide versatile templates for binding various metal ions, which are exchangeable by using a simple EDTA washing-and-filtration step...
February 15, 2018: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29446625/porous-metal-organic-frameworks-with-chelating-multiamine-sites-for-selective-adsorption-and-chemical-conversion-of-carbon-dioxide
#18
Dan Zhao, Xiao-Hui Liu, Jin-Han Guo, Hua-Jin Xu, Yue Zhao, Yi Lu, Wei-Yin Sun
A combination of carbon dioxide (CO 2 ) capture and chemical fixation in a one-step process is attractive for chemists and environmentalists. In this work, by incorporating chelating multiamine sites to enhance the binding affinity toward CO 2 , two novel metal-organic frameworks (MOFs) [Zn 2 (L)(2,6-NDC) 2 (H 2 O)]·1.5DMF·2H 2 O (1) and [Cd 2 (L)(2,6-NDC) 2 ]·1.5DMF·2H 2 O (2) (L = N 1 -(4-(1H-1,2,4-triazole-1-yl)benzyl)-N 1 -(2-aminoethyl)ethane-1,2-diamine, 2,6-H 2 NDC = 2,6-naphthalenedicarboxylic acid, DMF = N,N-dimethylformamide) were achieved under solvothermal conditions...
February 15, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29446234/a-natural-antioxidant-tannic-acid-mitigates-iron-overload-induced-hepatotoxicity-in-swiss-albino-mice-through-ros-regulation
#19
Tapasree Basu, Sourav Panja, Anil Khushalrao Shendge, Abhishek Das, Nripendranath Mandal
Tannic acid (TA), a water soluble natural polyphenol with 8 gallic acids groups, is abundantly present in various medicinal plants. Previously TA has been investigated for its antimicrobial and antifungal properties. Being a large polyphenol, TA chelates more than 1 metal. Hence TA has been explored for potent antioxidant activities against reactive oxygen species (ROS), reactive nitrogen species (RNS) and as iron chelator in vitro thereby mitigating iron-overload induced hepatotoxicity in vivo. Iron dextran was injected intraperitoneally in Swiss albino mice to induce iron-overload triggered hepatotoxicity, followed by oral administration of TA for remediation...
February 15, 2018: Environmental Toxicology
https://www.readbyqxmd.com/read/29445216/evaluation-of-her2-specific-peptide-ligand-for-its-employment-as-radiolabeled-imaging-probe
#20
Hadis Honarvar, Enrica Calce, Nunzianna Doti, Emma Langella, Anna Orlova, Jos Buijs, Valentina D'Amato, Roberto Bianco, Michele Saviano, Vladimir Tolmachev, Stefania De Luca
HER2 transmembrane receptor is an important target in immunotherapy treatment of breast and gastroesophageal cancer. Molecular imaging of HER2 expression may provide essential prognostic and predictive information concerning disseminated cancer and aid in selection of an optimal therapy. Radiolabeled low molecular weight peptide ligands are particularly attractive as probes for molecular imaging, since they reach and bind to the target and clear from non-target organs and blood stream faster than bulky antibodies...
February 14, 2018: Scientific Reports
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