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https://www.readbyqxmd.com/read/28738657/a-new-strategy-for-fabrication-of-water-dispersible-and-biodegradable-fluorescent-organic-nanoparticles-with-aie-and-esipt-characteristics-and-their-utilization-for-bioimaging
#1
Dazhuang Xu, Meiying Liu, Hui Zou, Jianwen Tian, Hongye Huang, Qing Wan, Yanfeng Dai, Yuanqing Wen, Xiaoyong Zhang, Yen Wei
Fluorescence probes play a crucial role in optical imaging for visualization of complex biological processes. As compared with conventional organic fluorogens, the probes with aggregation-induced emission (AIE) and excited-state intramolecular proton transfer (ESIPT) characteristics show significant advantages in high quantum yield at concentrated and aggregated state, large Stokes shift and low cytotoxicity. However, the synthesis of AIE-active fluorescent probes through the ESIPT mechanism has received only very limited attention...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738622/a-flow-based-procedure-exploiting-the-lab-in-syringe-approach-for-the-determination-of-ester-content-in-biodiesel-and-diesel-biodiesel-blends
#2
Samara Soares, Wanessa R Melchert, Fábio R P Rocha
The ester content is an important parameter to be monitored in biodiesel for evaluation of the transesterification reaction yield and for assessing the purity of the final product. This is also a relevant quality parameter in diesel/biodiesel blends to avoid frauds, because legislation establishes a minimum amount of biodiesel to be added to diesel. The official method EN14103 requires the addition of an alternative internal standard (methyl nonadecanoate) for analysis of biodiesel from bovine tallow because the methyl heptadecanoate is found in high amounts in this product...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738621/determining-heterocyclic-aromatic-amines-in-aqueous-samples-a-novel-dispersive-liquid-liquid-micro-extraction-method-based-on-solidification-of-floating-organic-drop-and-ultrasound-assisted-back-extraction-followed-by-uplc-ms-ms
#3
Romina Canales, María Guiñez, Cristian Bazán, Mario Reta, Soledad Cerutti
A novel dispersive liquid-liquid microextraction based on solidification of floating organic droplet combined with ultrasound assisted back extraction for the determination of four heterocyclic aromatic amines in natural water samples prior ultra high-performance liquid chromatography-tandem mass spectrometry was developed. The analytes were extracted from the water samples by a dispersive liquid-liquid microextraction procedure based on solidification of floating organic drop, which was performed by a mixture composed by a less dense than water extraction solvent, 1-undecanol, and a dispersive solvent, methanol...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738277/new-ruthenium-compounds-bearing-semicarbazone-2-formylopyridine-moiety-playing-with-auxiliary-ligands-for-tuning-the-mechanism-of-biological-activity
#4
Michał Łomzik, Olga Mazuryk, Dorota Rutkowska-Zbik, Grażyna Stochel, Philippe C Gros, Małgorzata Brindell
Two ruthenium(II) complexes Ru1 and Ru2 bearing as a one ligand 2,2'-bipyridine substituted by a semicarbazone 2-formylopyridine moiety (bpySC: 5-(4-{4'-methyl-[2,2'-bipyridine]-4-yl}but-1-yn-1-yl)pyridine-2-carbaldehyde semicarbazone) and as the others 2,2'-bipyridine (bpy) and 4,7-diphenyl-1,10-phenanthroline (dip), respectively, as auxiliary ligands have been prepared. Their biological activity has been studied on murine colon carcinoma (CT26) and human lung adenocarcinoma (A549) cell lines. The anti-proliferative activity was dependent on the presence of bpy or dip in the complex, with one order of magnitude higher cytotoxicity for Ru2 (dip ligands)...
July 14, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28738265/ground-state-charge-transfer-complex-formation-of-some-metalloporphyrins-with-aromatic-solvents-further-theoretical-and-experimental-investigations
#5
Biswajit Roy, Mihir Ghosh, Prajna Mukherjee, Somnath Chowdhury, Bikash C Gupta, Koushik Majhi, Subrata Sinha
In our earlier work (Chem. Phys. Letts. 592 (2014) 149-154), a new broad band was observed in the near infrared region (700-900nm) of the steady state absorption spectra of some metalloporphyrins (zinc tetraphenylporphyrin, zinc octaethylporphyrin and magnesium octaethylporphyrin) in aromatic solvents (chlorobenzene, 1,2-dichlorobenzene, benzonitrile, benzene and toluene) at high concentrations (~10(-4)molL(-1)). The band was ascribed to be due to ground state charge transfer complexation between solute and solvent molecules...
July 19, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28738134/indocyanine-green-angiography-and-optical-coherence-tomography-angiography-of-choroidal-neovascularization-in-age-related-macular-degeneration
#6
Chiara M Eandi, Antonio Ciardella, Mariacristina Parravano, Filippo Missiroli, Camilla Alovisi, Chiara Veronese, Maria C Morara, Massimo Grossi, Gianni Virgili, Federico Ricci
Purpose: To compare the capability of indocyanine green angiography (ICGA) and optical coherence tomography angiography (OCTA) in detecting choroidal neovascularization (CNV). Methods: In this prospective study, patients with CNV detected with fluorescein angiography (FA) underwent ICGA and OCTA, spectral domain OCT (SD-OCT), and infrared or fundus color photographs. CNV lesions were outlined on ICGA and OCTA images, and the composition and size of the CNV was documented...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28738121/incidence-risks-and-types-of-infections-in-pediatric-long-term-care-facilities
#7
Lisa Saiman, Philip Maykowski, Meghan Murray, Bevin Cohen, Natalie Neu, Haomioa Jia, Gordon Hutcheon, Edwin Simpser, Linda Mosiello, Luis Alba, Elaine Larson
Importance: The population of infants, children, and adolescents cared for at pediatric long-term care facilities is increasing in complexity and size and thus consumes substantial health care resources. Infections are a significant cause of morbidity and mortality in this population, but few recent data describe their incidence and effects. Objectives: To describe the types of infections diagnosed in residents of pediatric long-term care facilities, calculate infection rates, and identify risk factors for respiratory tract infections (RTIs)...
July 24, 2017: JAMA Pediatrics
https://www.readbyqxmd.com/read/28738061/magnetic-resonance-imaging-and-tensor-based-morphometry-in-the-mptp-non-human-primate-model-of-parkinson-s-disease
#8
Michel Modo, William R Crum, Madeline Gerwig, Anthony C Vernon, Priya Patel, Michael J Jackson, Sarah Rose, Peter Jenner, Mahmoud M Iravani
Parkinson's disease (PD) is the second most common neurodegenerative disorder producing a variety of motor and cognitive deficits with the causes remaining largely unknown. The gradual loss of the nigrostriatal pathway is currently considered the pivotal pathological event. To better understand the progression of PD and improve treatment management, defining the disease on a structural basis and expanding brain analysis to extra-nigral structures is indispensable. The anatomical complexity and the presence of neuromelanin, make the use of non-human primates an essential element in developing putative imaging biomarkers of PD...
2017: PloS One
https://www.readbyqxmd.com/read/28738009/morphological-evaluation-of-clefts-of-the-lip-palate-or-both-in-dogs
#9
Santiago Peralta, Nadine Fiani, Kimi H Kan-Rohrer, Frank J M Verstraete
OBJECTIVE To systematically characterize the morphology of cleft lip, cleft palate, and cleft lip and palate in dogs. ANIMALS 32 client-owned dogs with clefts of the lip (n = 5), palate (23), or both (4) that had undergone a CT or cone-beam CT scan of the head prior to any surgical procedures involving the oral cavity or face. PROCEDURES Dog signalment and skull type were recorded. The anatomic form of each defect was characterized by use of a widely used human oral-cleft classification system on the basis of CT findings and clinical images...
August 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28737972/identifying-health-information-technology-needs-of-oncologists-to-facilitate-the-adoption-of-genomic-medicine-recommendations-from-the-2016-american-society-of-clinical-oncology-omics-and-precision-oncology-workshop
#10
Kevin S Hughes, Edward P Ambinder, Gregory P Hess, Peter Paul Yu, Elmer V Bernstam, Mark J Routbort, Jean Rene Clemenceau, John T Hamm, Phillip G Febbo, Susan M Domchek, James L Chen, Jeremy L Warner
At the ASCO Data Standards and Interoperability Summit held in May 2016, it was unanimously decided that four areas of current oncology clinical practice have serious, unmet health information technology needs. The following areas of need were identified: 1) omics and precision oncology, 2) advancing interoperability, 3) patient engagement, and 4) value-based oncology. To begin to address these issues, ASCO convened two complementary workshops: the Omics and Precision Oncology Workshop in October 2016 and the Advancing Interoperability Workshop in December 2016...
July 24, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28737914/dft-study-on-the-complexation-of-nota-as-a-bifunctional-chelator-with-radiometal-ions
#11
Fatima Y Adeowo, Bahareh Honarparvar, Adam A Skelton
1,4,7 triazacyclononane-1,4,7 triacetic acid (NOTA) is a key bifunctional chelator utilized for the complexation of metal ions in radiopharmaceutical applications; the ability of these chelators depends on the strength of their binding with ions. The focus of the present work is to evaluate the complexation of Cu2+, Ga3+, Sc3+ and In3+ radiometal ions with NOTA using density functional theory (B3LYP functional) and 6-311+G(2d,2p)/DGDZVP basis sets. The significant role of ion-water interactions in the chelation interaction energies in solution reflects the competition between ion-water and NOTA-ion interaction in the chelation process...
July 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28737910/raman-and-ir-spectroscopy-studies-on-propane-at-pressures-of-up-to-40-gpa
#12
Daniil Kudryavtsev, Aleksandr Serovaiskii, Elena Mukhina, Anton Kolesnikov, Biliana Gasharova, Vladimir Kutcherov, Leonid S Dubrovinsky
Raman and IR spectroscopy studies on propane were performed at pressures of up to 40 GPa at ambient temperatures using the diamond anvil cell technique. Propane undergoes three phase transitions at 6.4(5) GPa, 14.5(5) GPa, and 26.5(5) GPa in Raman spectroscopy and at 7.0(5) GPa, 14.0(5) GPa and 27.0(5) GPa in IR spectroscopy. The phase transitions were identified using the Raman and IR splitting modes and the appearance or disappearance of peaks, which clearly corresponded to the changes in the frequencies of the modes as the pressure changed...
July 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28737821/structure-and-reactivity-of-ru-ii-terpy-n-n-cl-cl-complexes-consequences-for-biological-applications
#13
Marta Chrzanowska, Anna Katafias, Olga Impert, Anna Kozakiewicz, Andrzej Surdykowski, Paulina Brzozowska, Alicja Franke, Achim Zahl, Ralph Puchta, Rudi van Eldik
The crystal structures of [Ru(II)(terpy)(bipy)Cl]Cl·2H2O and [Ru(II)(terpy)(en)Cl]Cl·3H2O, where terpy = 2,2':6',2''-terpyridine, bipy = 2,2'-bipyridine and en = ethylenediamine, were determined and compared to the structure of the complexes in solution obtained by multi-nuclear NMR spectroscopy in DMSOd-6 as a solvent. In aqueous solution, both chlorido complexes aquate fully to the corresponding aqua complexes, viz. [Ru(II)(terpy)(bipy)(H2O)](2+) and [Ru(II)(terpy)(en)(H2O)](2+), within ca. 2 h and ca. 2 min at 37 °C, respectively...
July 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28737814/synthesis-and-characterization-of-1-diphenylphosphino-1-isocyanoferrocene-an-organometallic-ligand-combining-two-different-soft-donor-moieties-and-its-group-11-metal-complexes
#14
Karel Škoch, Ivana Císařová, Jiří Schulz, Ulrich Siemeling, Petr Štěpnička
The development of a practical synthesis of 1'-(diphenylphosphino)-1-aminoferrocene (2) and its P-borane adduct (2B) allowed the facile preparation of 1'-(diphenylphosphino)-1-isocyanoferrocene (1). This compound combining two specific soft-donor moieties was studied as a ligand for univalent Group 11 metal ions. The reactions of 1 with AgCl at 1 : 1 and 2 : 1 molar ratios only led to the coordination polymer [Ag2(μ-Cl)2(μ(P,C)-1)]n (6), while those with Ag[SbF6] provided the dimer [Ag2(Me2CO-κO)2(μ(P,C)-1)2][SbF6]2 and the quadruply-bridged disilver complex [Ag2(μ(P,C)-1)4][SbF6]2 (8), respectively...
July 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28737805/nonhelical-heterometallic-mo2m-npo-4-ncs-2-string-complexes-m-fe-co-ni-with-high-single-molecule-conductance
#15
Wei-Cheng Chang, Che-Wei Chang, Marc Sigrist, Shao-An Hua, Tsai-Jung Liu, Gene-Hsiang Lee, Bih-Yaw Jin, Chun-Hsien Chen, Shie-Ming Peng
Using the planar 1,8-naphthyridin-2(1H)-one (Hnpo) ligand, novel nonhelical HMSCs [Mo2M(npo)4(NCS)2] (M = Fe, Co, Ni) were synthesised and they exhibited high single-molecule conductance.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737804/modulation-of-in-out-and-out-out-conformations-in-x-x-x-phosphatranes-by-lewis-acids
#16
Goar Sánchez-Sanz, Cristina Trujillo, Ibon Alkorta, José Elguero
A theoretical study of [X.X'.X'']phosphatrane:Lewis acid complexes has been carried out in order to analyze how the in:out and out:out conformations can be modulated by the interaction with Lewis acids (LA). It has been found that in:out structures are more stable in larger systems i.e. in [4.4.3]:LA and [4.4.4]:LA than in [3.3.3]:LA and [4.3.3]:LA. The results obtained for the relative energies in conjunction with electron density properties showed that upon complexation, in:out conformers become more stable with the increasing acidity of the corresponding Lewis acid...
July 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28737799/slow-magnetic-relaxation-in-five-coordinate-spin-crossover-cobalt-ii-complexes
#17
Hui-Hui Cui, Jing Wang, Xue-Tai Chen, Zi-Ling Xue
We present the first examples of the coexistence of field induced slow magnetic relaxation and spin-crossover observed in five-coordinate cobalt(ii) complexes [Co(12-TMC)(CH3CN)](X)2 (12-TMC = 1,4,7,10-tetramethyl-1,4,7,10-tetraazacyclododecane, X = BF4(-), 1; PF6(-), 2). The direct-current (dc) magnetic data show a gradual and incomplete spin-crossover at high temperature. 1 and 2 display frequency- and temperature-dependent alternating-current (ac) magnetic susceptibility under an applied dc field of 2500 Oe, which originates from the S = 1/2 spin state of Co(ii) ions...
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737722/induction-of-a-regulatory-phenotype-in-cd3-cd4-hla-dr-t-cells-after-allogeneic-mixed-lymphocyte-culture-indications-of-both-contact-dependent-and-independent-activation
#18
Anne Louise Schacht Revenfeld, Rikke Bæk, Malene Møller Jørgensen, Kim Varming, Allan Stensballe
Although the observation of major histocompatibility complex II (MHCII) receptors on T cells is longstanding, the explanation for this occurrence remains enigmatic. Reports of an inducible, endogenous expression exist, as do studies demonstrating a protein acquisition from other cells by mechanisms including vesicle transfer. Irrespective of origin, the presence of the human MHCII isotype, human leukocyte antigen DR (HLA-DR), potentially identifies a regulatory T cell population. Using an allogeneic mixed lymphocyte culture (MLC) to induce an antigen-specific immune response, the role of antigen-presenting cells (APCs) for the presence of HLA-DR on cluster of differentiation 3(CD3)+ CD4+ T cells was evaluated...
July 24, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28737690/synthesis-physico-chemical-characterization-crystal-structure-and-influence-on-microbial-and-tumor-cells-of-some-co-ii-complexes-with-5-7-dimethyl-1-2-4-triazolo-1-5-a-pyrimidine
#19
Luminiţa Măruţescu, Larisa Calu, Mariana Carmen Chifiriuc, Coralia Bleotu, Constantin-Gabriel Daniliuc, Denisa Fălcescu, Crina Maria Kamerzan, Mihaela Badea, Rodica Olar
Three complexes, namely [Co(dmtp)₂(OH₂)₄][CoCl₄] (1), [Co(dmtp)₂Cl₂] (2) and [Co(dmtp)₂(OH₂)₄]Cl₂∙2H₂O (3) (dmtp: 5,7-dimethyl-1,2,4-triazolo[1,5-a]pyrimidine), were synthesized and characterized by spectral (IR, UV-Vis-NIR), and magnetic measurements at room temperature, as well as single crystal X-ray diffraction. Complex (1) crystallizes in monoclinic system (space group C2/c), complex (2) adopts an orthorhombic system (space group Pbca), and complex (3) crystallizes in triclinic system (space group P1)...
July 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28737474/artemisia-dracunculus-extracts-obtained-by-organic-solvents-and-supercritical-co2-produce-cytotoxic-and-antitumor-effects-in-mice-with-l5178y-lymphoma
#20
Martha Hilda Navarro-Salcedo, Jorge Ivan Delgado-Saucedo, Victor Hugo Siordia-Sánchez, Luis J González-Ortiz, Gustavo Adolfo Castillo-Herrera, Ana M Puebla-Pérez
We investigated the cytotoxic and antitumor effects of nine leaf extracts from Artemisia dracunculus (Tarragon). Five extracts were obtained using different organic solvents and four by supercritical CO2. The cytotoxic effects were expressed as IC50 in 100, 80, 80, 100, and 80 μg/mL by respective solvents: hexane, ethyl acetate, acetone, ethanol, and acetonitrile in L5178Y lymphoma cells. For supercritical CO2 extract A, IC50 was 100 μg/mL; for extracts C and D, IC50 was 150 μg/mL. The antitumor activity was assessed through a tumor growth inhibition test that measured ascites fluid volume and tumor cell counts of BALB/c mice (2 × 10(4) cells L5178Y i...
July 24, 2017: Journal of Medicinal Food
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