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Jiping Ma, Zhidan Yao, Liwei Hou, Wenhui Lu, Qipeng Yang, Jinhua Li, Lingxin Chen
Magnetic metal-organic frameworks (MOFs, [MIL-101]) were prepared and used as magnetic solid-phase extraction (MSPE) adsorbents for preconcentration of four kinds of pyrazole/pyrrole pesticides (flusilazole, fipronil, chlorfenapyr, and fenpyroximate) in environmental water samples, followed by high-performance liquid chromatography-diode-array detector (HPLC-DAD) determination. Several variables affecting MSPE efficiency were systematically investigated, including amount of MIL-101, extraction time, sample pH, salt concentration, type of desorption solvent and desorption number of times...
December 1, 2016: Talanta
Pauline K Park, Jeremy W Cannon, Wen Ye, Lorne H Blackbourne, John B Holcomb, William Beninati, Lena M Napolitano
BACKGROUND: The overall incidence and mortality of acute respiratory distress syndrome (ARDS) in civilian trauma settings have decreased over the past four decades; however, the epidemiology and impact of ARDS on modern combat casualty care are unknown. We sought to determine the incidence, risk factors, resource utilization, and mortality associated with ARDS in current combat casualty care. METHODS: This was a retrospective review of mechanically ventilated US combat casualties within the Department of Defense Trauma Registry (formerly the Joint Theater Trauma Registry) during Operation Iraqi Freedom/Enduring Freedom (October 2001 to August 2008) for ARDS development, resource utilization, and mortality...
November 2016: Journal of Trauma and Acute Care Surgery
Pedro Nazareth Aguiar, Gustavo Trautman Stock, Gilberto de Lima Lopes, Michelle Samora de Almeida, Hakaru Tadokoro, Bárbara de Souza Gutierres, Douglas Antônio Rodrigues
Objective: To assess aspects related to cancer in indigenous population. Methods: This is a retrospective study developed in a public university hospital. We included patients with 18 or more years of age, diagnosed with solid tumors, and followed between 2005 and 2015. Clinical features were assessed by descriptive statistics, and survival was evaluated by Kaplan-Meier curves and multivariate Cox regression. Results: Fifty patients were included...
July 2016: Einstein
Irsan E Kooi, Saskia E van Mil, David MacPherson, Berber M Mol, Annette C Moll, Hanne Meijers-Heijboer, Gertjan J L Kaspers, Jacqueline Cloos, Hein Te Riele, Josephine C Dorsman
Several murine retinoblastoma models have been generated by deleting the genes encoding for retinoblastoma susceptibility protein pRb and one of its family members p107 or p130. In Rb(-/-) p107(-/-) retinoblastomas, somatic copy number alterations (SCNAs) like Mdm2 amplification or Cdkn2a deletion targeting the p53-pathway occur, which is uncommon for human retinoblastoma. In our study, we determined SCNAs in retinoblastomas developing in Rb(-/-) p130(-/-) mice and compared this to murine Rb(-/-) p107(-/-) tumors and human tumors...
October 17, 2016: Genes, Chromosomes & Cancer
Yung-Han Shih, Kuen-Yun Wang, Brenda T Singco, Chia-Her Lin, Hsi-Ya Huang
In this study, we first demonstrated the effect of two types of metal-organic framework-polymer (MOF-polymer) monoliths on in-tube solid-phase microextraction (IT-SPME) of sulfonamides. Sulfonamides were successfully adsorbed onto MIL-101(Cr)-polymer but were difficult to elute due to these sulfonamides could interact via Lewis acid-base interaction with the presence of Cr(III) coordinatively unsaturated metal sites (CUS). Moreover, the cage-type topology of MIL-101(Cr) that could produce multiple pathways thus complicates the desorption of the test analytes from the sorbent...
October 17, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Shuai-Ru Zhu, Peng-Fei Liu, Meng-Ke Wu, Wen-Na Zhao, Guo-Chang Li, Kai Tao, Fei-Yan Yi, Lei Han
Metal-organic frameworks (MOFs) are considered as suitable materials for various applications in the area of photocatalysis. On the other hand, 2D BiOBr materials are efficient for the photodegradation of organic dyes under visible light illumination. In this work, BiOBr/NH2-MIL-125(Ti) composite photocatalysts with different NH2-MIL-125(Ti) content were prepared by incorporating NH2-MIL-125(Ti) with BiOBr using a co-precipitation method. A series of characterizations confirmed the strong synergistic effect between BiOBr and NH2-MIL-125(Ti)...
October 17, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Jessica K Bristow, Jonathan M Skelton, Katrine L Svane, Aron Walsh, Julian D Gale
We report the development of a forcefield capable of reproducing accurate lattice dynamics of metal-organic frameworks. Phonon spectra, thermodynamic and mechanical properties, such as free energies, heat capacities and bulk moduli, are calculated using the quasi-harmonic approximation to account for anharmonic behaviour due to thermal expansion. Comparison to density functional theory calculations of properties such as Grüneisen parameters, bulk moduli and thermal expansion supports the accuracy of the derived forcefield model...
October 12, 2016: Physical Chemistry Chemical Physics: PCCP
Sora Choi, Taeho Kim, Hoyeon Ji, Hee Jung Lee, Moonhyun Oh
The growth of one metal-organic framework (MOF) on another MOF for constructing a hetero-compositional hybrid MOF is an interesting research topic because of the curiosity regarding the occurrence of this phenomenon and the value of hybrid MOFs as multi-functional materials or routes for fine-tuning MOF properties. In particular, the anisotropic growth of MOF on MOF is very fascinating for the development of MOFs possessing atypical shapes and heterostructures or abnormal properties. Herein, we clarify the understanding of growth behavior of a secondary MOF on an initial MOF template, such as isotropic or anisotropic ways associated with their cell parameters...
October 11, 2016: Journal of the American Chemical Society
Tanya K Todorova, Xavier Rozanska, Christel Gervais, Alexandre Legrand, Linh N Ho, Pierrick Berruyer, Anne Lesage, Lyndon Emsley, David Farrusseng, Jérôme Canivet, Caroline Mellot-Draznieks
We use density functional theory, newly parameterized molecular dynamics simulations, and last generation (15) N dynamic nuclear polarization surface enhanced solid-state NMR spectroscopy (DNP SENS) to understand graft-host interactions and effects imposed by the metal-organic framework (MOF) host on peptide conformations in a peptide-functionalized MOF. Focusing on two grafts typified by MIL-68-proline (-Pro) and MIL-68-glycine-proline (-Gly-Pro), we identified the most likely peptide conformations adopted in the functionalized hybrid frameworks...
October 11, 2016: Chemistry: a European Journal
Pill Won Seo, Nazmul Abedin Khan, Zubair Hasan, Sung Hwa Jhung
A highly porous metal-organic framework (MOF), MIL-101, was modified to introduce urea or melamine via grafting on open metal sites of the MOF. Adsorptive removal of three artificial sweeteners (ASWs) was studied using the MOFs, with or without modifications (including nitration), and activated carbon (AC). The adsorbed quantities (based on the weight of the adsorbent) of saccharin (SAC) under various conditions decreased in the order urea-MIL-101 > melamine-MIL-101 > MIL-101 > AC > O2N-MIL-101; however, the quantities based on unit surface area are in the order melamine-MIL-101 > urea-MIL-101 > MIL-101 > O2N-MIL-101...
October 10, 2016: ACS Applied Materials & Interfaces
Nan Lu, Ting Wang, Pan Zhao, Lianjun Zhang, Xiaowen Lun, Xueli Zhang, Xiaohong Hou
In the presented work, metal-organic framework (MOF) material MIL-101(Cr) (MIL, Matérial Institute Lavoisier) was used as a sorbent for vortex assisted dispersive micro-solid-phase extraction (VA-D-μ-SPE) of trace amount of metronidazole (MNZ), ronidazole (RNZ), secnidazole (SNZ), dimetridazole (DMZ), tinidazole (TNZ), and ornidazole (ONZ) in different environmental water samples. Ultra-high-performance liquid chromatography coupled with tandem mass spectrometry (UPLC-MS/MS) was used to quantify the target analytes...
October 8, 2016: Analytical and Bioanalytical Chemistry
Najam U Qadir, Syed A M Said, Rached B Mansour, Khalid Mezghani, Anwar Ul-Hamid
Conventional small-scale adsorption chillers generally employ silica-gel/water or zeolite/water working pairs given the relatively high level of mesoporosity and water affinity in these adsorbent materials. However, the coefficient of performance (COP) and specific cooling power (SCP) evaluated for the adsorption chiller using these adsorbent/adsorbate pairs cannot be still considered practically feasible in the context of a commercial system. Metal organic frameworks (MOFs) are not only characterized by much higher water adsorption capacities than these materials, but also can be mass-produced using much simpler methods than the template-assisted synthesis routes of most zeolites...
October 4, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
C Volkringer, C Falaise, P Devaux, R Giovine, V Stevenson, F Pourpoint, O Lafon, M Osmond, C Jeanjacques, B Marcillaud, J C Sabroux, T Loiseau
We report the study of the resistance of archetypal MOFs (MILs, HKUST-1, UiO-66, and ZIF-8) under gamma irradiation. The different porous solids were irradiated with doses up to 1.75 MGy. All the MOFs constructed with transition metals (Cu(2+), Zn(2+), Zr(4+)) exhibit an evident destruction of the framework, whereas the compounds constructed with aluminium remain intact.
October 13, 2016: Chemical Communications: Chem Comm
Sora Choi, Wonhee Cha, Hoyeon Ji, Dooyoung Kim, Hee Jung Lee, Moonhyun Oh
The controlled formation of metal-organic frameworks (MOFs) or coordination polymers (CPs) with suitable components and structural features is one of the most important themes in MOF research. In particular, the reliable preparation of hybrid MOFs containing more than two different kinds of metal ions or organic linkers and a comprehensive understanding of the structural flexibility of MOFs are the central issues for the production of MOFs with the desired properties. We report the synthesis of micro-sized hybrid MOF particles [also known as coordination polymer particles (CPPs)] containing two or three kinds of metal ions in each particle: {FexMyM'1-x-y}-MIL-88B (MIL stands for Materials of Institut Lavoisier, M and M' = Ga, Co, or Mn)...
September 22, 2016: Nanoscale
T Homburg, C Hartwig, H Reinsch, M Wark, N Stock
The structures of the imidazole loaded derivatives of Al-MIL-53 [Al(OH)(1,4-BDC-(CH3)x)] (x = 0, 1, 2) and CAU-11 ([Al(OH)(SDBA)]) (1,4-H2BDC = terephthalic acid; H2SDBA = 4,4'-sulfonyldibenzoic acid) were determined from powder X-ray diffraction data. Impedance spectroscopy measurements were carried out to evaluate their proton conductivities under anhydrous conditions at temperatures up to 110 °C. In Al-MIL-53-(CH3)x_HIm (x = 0, 1, 2) the formation of hydrogen bonds between the framework and the guest molecules results in a decrease in proton conductivity (x0 = 1...
September 27, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
D A Stolper, M L Bender, G B Dreyfus, Y Yan, J A Higgins
The history of atmospheric O2 partial pressures (Po2) is inextricably linked to the coevolution of life and Earth's biogeochemical cycles. Reconstructions of past Po2 rely on models and proxies but often markedly disagree. We present a record of Po2 reconstructed using O2/N2 ratios from ancient air trapped in ice. This record indicates that Po2 declined by 7 per mil (0.7%) over the past 800,000 years, requiring that O2 sinks were ~2% larger than sources. This decline is consistent with changes in burial and weathering fluxes of organic carbon and pyrite driven by either Neogene cooling or increasing Pleistocene erosion rates...
September 23, 2016: Science
Silvânia Suely Caribé de Araújo Andrade, Maria Helena Prado de Mello-Jorge
OBJECTIVE: To estimate the potential years of life lost by road traffic injuries three years after the beginning of the Decade of Action for Traffic Safety. METHODS: We analyzed the data of the Sistema de Informações sobre Mortalidade (SIM - Mortality Information System) related to road traffic injuries, in 2013. We estimated the crude and standardized mortality rates for Brazil and geographic regions. We calculated, for the Country, the proportional mortality according to age groups, education level, race/skin color, and type or quality of the victim while user of the public highway...
October 3, 2016: Revista de Saúde Pública
Meiting Zhao, Kuo Yuan, Yun Wang, Guodong Li, Jun Guo, Lin Gu, Wenping Hu, Huijun Zhao, Zhiyong Tang
Owing to the limited availability of natural sources, the widespread demand of the flavouring, perfume and pharmaceutical industries for unsaturated alcohols is met by producing them from α,β-unsaturated aldehydes, through the selective hydrogenation of the carbon-oxygen group (in preference to the carbon-carbon group). However, developing effective catalysts for this transformation is challenging, because hydrogenation of the carbon-carbon group is thermodynamically favoured. This difficulty is particularly relevant for one major category of heterogeneous catalyst: metal nanoparticles supported on metal oxides...
October 5, 2016: Nature
Pill Won Seo, Biswa Nath Bhadra, Imteaz Ahmed, Nazmul Abedin Khan, Sung Hwa Jhung
Adsorption of typical pharmaceuticals and personal care products (PPCPs) (such as naproxen, ibuprofen and oxybenzone) from aqueous solutions was studied by using the highly porous metal-organic framework (MOF) MIL-101 with and without functionalization. Adsorption results showed that MIL-101s with H-donor functional groups such as -OH and -NH2 were very effective for naproxen adsorption, despite a decrease in porosity, probably because of H-bonding between O atoms on naproxen and H atoms on the adsorbent. For this reason, MIL-101 with two functional groups capable of H-bonding (MIL-101-(OH)2) exhibited remarkable adsorption capacity based on adsorbent surface area...
October 3, 2016: Scientific Reports
Stijn Van der Perre, Anuschka Liekens, Bart Bueken, Dirk E De Vos, Gino V Baron, Joeri F M Denayer
Monodisperse MIL-125(Ti) Metal-Organic Framework crystals were synthesized and studied as stationary phase in high performance liquid chromatography (HPLC). Different pure compounds and model mixtures (including stereoisomer mixtures) were injected from which chromatographic parameters, including selectivities and resolution factors, were determined to evaluate the adsorption properties and separation performance of MIL-125(Ti) in liquid phase. The MIL-125(Ti) framework displayed a trans selectivity for cis/trans difunctionalized cyclohexane molecules with high selectivity and resolution for 1,3-dimethylcyclohexane and 4-ethylcyclohexanol...
October 21, 2016: Journal of Chromatography. A
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