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Hongxia Dai, Wenjuan Lü, Xianwei Zuo, Qian Zhu, Congjie Pan, Xiaoying Niu, Juanjuan Liu, HongLi Chen, Xingguo Chen
In this work, we report a durable and sensitive H2O2 biosensor based on boronic acid functionalized metal-organic frameworks (denoted as MIL-100(Cr)-B) as an efficient immobilization matrix of horseradish peroxidase (HRP). MIL-100(Cr)-B features a hierarchical porous structure, extremely high surface area, and sufficient recognition sites, which can significantly increase HRP loading and prevent them from leakage and deactivation. The H2O2 biosensor can be easily achieved without any complex processing. Meanwhile, the immobilized HRP exhibited enhanced stability and remarkable catalytic activity towards H2O2 reduction...
April 18, 2017: Biosensors & Bioelectronics
Ahmad Nikseresht, Asra Daniyali, Mahdi Ali-Mohammadi, Ahmad Afzalinia, Abbas Mirzaie
In this work, esterification of oleic acid by various alcohols is achieved with high yields under ultrasonic irradiation. This reaction performed with a novel heterogeneous catalyst that fabricated by heteropoly acid and Fe(III)-based MOF, namely MIL-53 (Fe). Syntheses of MIL-53 and encapsulation process carry out by ultrasound irradiation at ambient temperature and atmospheric pressure. The prepared composite was characterized by various techniques such as XRD, FT-IR, SEM, BET and ICP that demonstrate excellent catalytic activities, while being highly convenient to synthesize...
July 2017: Ultrasonics Sonochemistry
M Jahurul Islam, Hyun Kook Kim, D Amaranatha Reddy, Yujin Kim, Rory Ma, Heehyun Baek, Joonghan Kim, Tae Kyu Kim
Semiconductor-based photocatalysis is a green method for the removal of toxic organic pollutants by decomposition into harmless products. However, traditional single-component semiconductors are unable to reach high degradation efficiencies due to excessive photo charge carrier recombination. The use of hybrid nanocomposite photocatalysts is a promising strategy for overcoming this problem by reducing recombination as well as ensuring that large amounts of solar energy are harvested. Herein, a novel visible-light-active hybrid nanocomposite, BiOI/MIL-88B(Fe), was successfully synthesized through a simple precipitation method...
April 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Michael A Klatt, Gerd E Schröder-Turk, Klaus Mecke
PURPOSE: Structure-property relations, which relate the shape of the microstructure to physical properties such as transport or mechanical properties, need sensitive measures of structure. What are suitable fabric tensors to quantify the shape of anisotropic heterogeneous materials? The mean intercept length is among the most commonly used characteristics of anisotropy in porous media, e. g., of trabecular bone in medical physics. Yet, in this series of two papers we demonstrate that it has conceptual shortcomings that limit the validity of its results...
April 20, 2017: Medical Physics
Bruna Hinnah Borges Martins de Freitas, Denise da Costa Boamorte Cortela, Silvana Margarida Benevides Ferreira
OBJECTIVE: To identify the historical trend of leprosy epidemiological indicators in individuals under the age of 15 in the state of Mato Grosso. METHODS: Descriptive study with trend analysis of leprosy indicators in individuals under the age of fifteen registered in the Mato Grosso's System for Notifiable Diseases between 2001 and 2013. We used the Prais-Winsten procedure for analyzing generalized linear regression at a significance level of 5%. We considered as increasing time series when the annual percent change was positive, decreasing when negative and stationary when there was no significant difference between its value and zero...
April 10, 2017: Revista de Saúde Pública
Jeroen De Decker, Karel Folens, Jeriffa De Clercq, Maria Meledina, Gustaaf Van Tendeloo, Gijs Du Laing, Pascal Van Der Voort
Mesoporous MIL-101(Cr) is used as host for a ship-in-a-bottle type adsorbent for selective U(VI) recovery from aqueous environments. The acid-resistant cage-type MOF is built in-situ around N,N-Diisobutyl-2-(octylphenylphosphoryl)acetamide (CMPO), a sterically demanding ligand with high U(VI) affinity. This one-step procedure yields an adsorbent which is an ideal compromise between homogeneous and heterogeneous systems, where the ligand can act freely within the pores of MIL-101, without leaching, while the adsorbent is easy separable and reusable...
April 9, 2017: Journal of Hazardous Materials
Xiuna Jia, Pan Zhao, Xiu Ye, Lianjun Zhang, Ting Wang, Qinyu Chen, Xiaohong Hou
As a novel material, metal-organic framework/graphite oxide (MIL-101(Cr)@GO) has great potential for the pretreatment of trace analytes. In the present study, MIL-101(Cr)@GO was synthesized using a solvothermal synthesis method at the nanoscale and was applied as sorbent in the dispersive micro-solid phase extraction (DMSPE) for the enrichment of the trace sulfonamides (SAs) from milk samples for the first time. Several experimental parameters including kinds of sorbents, the effect of pH, the amount of MIL-101(Cr)@GO, ionic strength, adsorption time, desorption solvent and desorption time were investigated...
July 1, 2017: Talanta
Elodie Guillaume, Ludivine Launay, Olivier Dejardin, Véronique Bouvier, Lydia Guittet, Pauline Déan, Annick Notari, Rémy De Mil, Guy Launoy
Evaluation of mobile mammography for reducing social and geographic inequalities in breast cancer screening participation. We examined the responses to first invitations to undergo breast cancer screening from 2003 to 2012 in Orne, a French department. Half of the participants could choose between screening in a radiologist's office or a mobile mammography (MM) unit. We calculated the participation rate and individual participation model according to age group, deprivation quintile and distance. Among participants receiving an MM invitation, the preference was for MM...
April 10, 2017: Preventive Medicine
Yanan Wang, Jiaxi Wang, Mingxia Gao, Xiangmin Zhang
Analysis of protein glycosylation remains a significant challenge due to the low abundance of glycoproteins or N-glycopeptides. Here we have synthesized an amino-functionalized metal-organic framework (MOF) MIL-101(Cr)-NH2 whose surface is grafted with a hydrophilic dendrimer poly(amidoamine) (PAMAM) for N-glycopeptide enrichment based on the hydrophilic interactions. The selected substrate MOF MIL-101(Cr) owns high surface area which provides nice support for peptide adsorption. In addition, the MOF displayed a good hydrophilic property after being modified with amino groups...
April 8, 2017: Proteomics
Xiaoyao Dao, Yonghong Ni
Aluminum-based coordination polymers, MIL-110(Al) nanotubes, were successfully prepared from a mixed solution of methanol and ethanol with the volume ratio of 10 : 10 at room temperature in the absence of any template or surfactant; AlCl3 and sodium 1,3,5-benzenetricarboxylate (Na3BTC) were employed as the initial reactants. The composition, structure, and morphology of the as-obtained nanotubes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrometry (EDS), thermogravimetric analysis (TGA), and inductively coupled plasma atomic emission spectroscopy (ICP-AES)...
April 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Raynald Giovine, Christophe Volkringer, Sharon E Ashbrook, Julien Trébosc, David McKay, Thierry Loiseau, Jean-Paul Amoureux, Olivier Lafon, Frédérique Pourpoint
Advanced solid-state NMR methods and first-principles calculations demonstrate for the first time the formation of penta-coordinated scandium sites. These coordinatively unsatured sites were shown during the thermal activation of scandium-based Metal-Organic Frameworks (MOFs). ⁴⁵Sc NMR experiment allows their specific observation in activated Sc₃BTB₂ and MIL-100(Sc) MOFs. The assignment of the ScO₅ groups is supported by the DFT calculations of NMR parameters. The presence of ScO₅ Lewis acid sites in MIL-100(Sc) explains furthermore its catalytic activity...
April 5, 2017: Chemistry: a European Journal
Matheus Daros Pinto, Anthony J Blazevich, Lars L Andersen, Pedro Mil-Homens, Ronei Silveira Pinto
Commonly used injury risk prediction tests such as the hamstring-to-quadriceps (H:Q) strength ratio appear to be poor predictors of non-contact injury. However, these tests are typically performed in a non-fatigued state, despite accumulated fatigue being an important risk factor for both hamstring strain (HS) and anterior cruciate ligament (ACL) injuries in professional soccer players PURPOSE: To examine the influence of neuromuscular fatigue on the H:Q strength ratio and the association between fatigued and non-fatigued ratio scores, after the effect of different H:Q calculation methods were compared and contrasted METHODS: Thirty-five professional soccer players performed a 30-repetition isokinetic fatigue test protocol...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
Jun-Hao Wang, Ying Zhang, Mian Li, Shu Yan, Dan Li, Xian-Ming Zhang
Chromium(III)-based metal-organic frameworks (Cr-MOFs) are very attractive in a wide range of investigations because of their robustness and high porosity. However, reports on Cr-MOFs are scarce owing to the difficulties in their direct synthesis. Recently developed postsynthetic routes to obtain Cr-MOFs suffered from complicated procedures and a lack of general applicability. Herein, we report a highly efficient and versatile strategy, namely solvent-assisted metal metathesis, to obtain Cr-MOFs from a variety of Fe(III) -MOFs, including several well-known MOFs and a newly synthesized one, through judicious selection of a coordinating solvent...
April 4, 2017: Angewandte Chemie
Karsten Schöller, Marjan Alimi, Guang-Ting Cong, Paul Christos, Roger Härtl
BACKGROUND: Decompression without fusion is a treatment option in patients with lumbar spinal stenosis (LSS) associated with stable low-grade degenerative spondylolisthesis (DS). A minimally invasive unilateral laminotomy (MIL) for "over the top" decompression might be a less destabilizing alternative to traditional open laminectomy (OL). OBJECTIVE: To review secondary fusion rates after open vs minimally invasive decompression surgery. METHODS: We performed a literature search in Pubmed/MEDLINE using the keywords "lumbar spondylolisthesis" and "decompression surgery...
March 1, 2017: Neurosurgery
Xiao Lian, Bing Yan
The recent discovery of lanthanide organic frameworks (Ln-MOFs) offers the potential for biomarkers or metabolites sensing. This is another field that is closely connected with life science and medicine. In this work, a stable and luminescent phosphonate Ln-MOFs MIL-91(Al:Eu) and its derivatives composite Cu(2+)@MIL-91(Al:Eu) were synthesized. The rebound of luminescence of Cu(2+)@MIL-91(Al:Eu) that origin of Eu(3+) is observed in the presence of uric acid. This On-Off-On pattern is utilized for detecting uric acid, which is the final metabolite of purine...
March 30, 2017: Inorganic Chemistry
Fang Gong, Yu-Hong Pan, Xuan Huang, Hua-Yan Zhu, Dong-Lin Jiang
Initially identified as a T cell and mast cell growth factor, interleukin (IL)-9 has long been recognized as an important mediator of asthma. Recently, accumulating results from transgenic mice demonstrated that systemic or lung-specific overexpression of IL-9 caused asthma-associated symptoms. Moreover, anti-mIL-9 antibody (Ab) blocking treatment alleviated disease in animal models of asthma. In light of the large quantity of data from the murine models, MEDI-528, a humanized anti-IL-9 monoclonal Ab has been produced to assess the activity of IL-9 on human asthma...
February 2017: Experimental and Therapeutic Medicine
Feng-Chih Kuo, Ya-Hsien Huang, Fu-Huang Lin, Yi-Jen Hung, Chang-Hsun Hsieh, Chieh-Hua Lu, Sheng-Chiang Su, Chia-Luen Huang, Chien-Hsing Lee, Nain-Feng Chu
BACKGROUND: Morbid obesity is related to chronic inflammation and many metabolic complications. Interleukin (IL)-6 plays a pivotal pathophysiological role in obesity, and IL-6 trans-signaling through the soluble IL-6 receptor (sIL-6R) has a major proinflammatory effect. The aim of this study was to investigate the association between sIL-6R, adipocyte size, and insulin resistance in morbidly obese individuals. METHODS: We measured concentrations of sIL-6R, high-sensitivity C-reactive protein, and lipid parameters and estimated homeostasis model assessment of insulin resistance (HOMA-IR) before the patients underwent bariatric surgery...
March 27, 2017: Metabolic Syndrome and related Disorders
Sebastian Friebe, Alexander Mundstock, Daniel Schneider, Jürgen Caro
The preparation and scalability of zeolite or metal organic framework (MOF) membranes remains a major challenge, and thus prevents the application of these materials in large-scale gas separation. Additionally, several zeolite or MOF materials are quite difficult or nearly impossible to grow as defect-free layers, and require expensive macroporous ceramic or polymer supports. Here, we present new self-supporting zeolite and MOF composite membranes, called Polymer-Stabilized Percolation Membranes (PSPMs), consisting of a pressed gas selective percolation network (in our case ZIF-8, NaX and MIL-140) and a gas-impermeable infiltrated epoxy resin for cohesion...
March 27, 2017: Chemistry: a European Journal
Wenfei Dong, Liaoyuan Yang, Yuming Huang
A facile and rapid post-synthetic strategy was proposed to prepare a glycine functionalized MIL-53(Fe), namely glycine-MIL-53(Fe), by a simple mixing of water dispersible MIL-53(Fe) and glycine. The FT-IR, SEM, XRD and zeta potential were used to characterize the glycine-MIL-53(Fe). The result showed that glycine post-synthetic modification of MIL-53(Fe) did not change in the morphology and crystal structure of MIL-53(Fe). Interestingly, compared with MIL-53(Fe), the glycine-MIL-53(Fe) exhibits an enhanced peroxidase-like activity, which could catalyze the oxidation of TMB by H2O2 to produce an intensive color reaction...
May 15, 2017: Talanta
Jiwoo An, Kira L Rahn, Jared L Anderson
A headspace single drop microextraction (HS-SDME) method and a dispersive liquid-liquid microextraction (DLLME) method were developed using two tetrachloromanganate ([MnCl4(2-)])-based magnetic ionic liquids (MIL) as extraction solvents for the determination of twelve aromatic compounds, including four polyaromatic hydrocarbons, by reversed phase high-performance liquid chromatography (HPLC). The analytical performance of the developed HS-SDME method was compared to the DLLME approach employing the same MILs...
May 15, 2017: Talanta
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