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991.
Michele M. Schantz Gauthier Eppe Jean-François Focant Coreen Hamilton N. Alan Heckert Rebecca M. Heltsley Dale Hoover Jennifer M. Keller Stefan D. Leigh Donald G. Patterson Jr Adam L. Pintar Katherine E. Sharpless Andreas Sjödin Wayman E. Turner Stacy S. Vander Pol Stephen A. Wise 《Analytical and bioanalytical chemistry》2013,405(4):1203-1211
Four new Standard Reference Materials (SRMs) have been developed to assist in the quality assurance of chemical contaminant measurements required for human biomonitoring studies, SRM 1953 Organic Contaminants in Non-Fortified Human Milk, SRM 1954 Organic Contaminants in Fortified Human Milk, SRM 1957 Organic Contaminants in Non-Fortified Human Serum, and SRM 1958 Organic Contaminants in Fortified Human Serum. These materials were developed as part of a collaboration between the National Institute of Standards and Technology (NIST) and the Centers for Disease Control and Prevention (CDC) with both agencies contributing data used in the certification of mass fraction values for a wide range of organic contaminants including polychlorinated biphenyl (PCB) congeners, chlorinated pesticides, polybrominated diphenyl ether (PBDE) congeners, and polychlorinated dibenzo-p-dioxin (PCDD) and dibenzofuran (PCDF) congeners. The certified mass fractions of the organic contaminants in unfortified samples, SRM 1953 and SRM 1957, ranged from 12 ng/kg to 2200 ng/kg with the exception of 4,4′-DDE in SRM 1953 at 7400 ng/kg with expanded uncertainties generally <14 %. This agreement suggests that there were no significant biases existing among the multiple methods used for analysis. Figure
Comparison of Concentrations of Selected Compounds in Human Serum and Human Milk Standard Reference Materials (SRMs) 相似文献
992.
Nicolò Mauro Amedea Manfredi Elisabetta Ranucci Patrizia Procacci Michele Laus Diego Antonioli Cristina Mantovani Valerio Magnaghi Paolo Ferruti 《Macromolecular bioscience》2013,13(3):332-347
This paper reports on the synthesis and physico‐chemical, mechanical, and biological characterization of two sets of poly(amidoamine) (PAA) hydrogels with potential as scaffolds for in vivo peripheral nerve regeneration. They are obtained by polyaddition of piperazine with N,N′‐methylenebis(acrylamide) or 1,4‐bis(acryloyl)piperazine with 1,2‐diaminoethane as cross‐linking agent and exhibit a combination of relevant properties, such as mechanical strength, biocompatibility, biodegradability, ability to induce adhesion and proliferation of Schwann cells (SCs) preserving their viability. Moreover, the most promising hydrogels, that is those deriving from 1,4‐bis(acryloyl)piperazine, allow the in vitro growth of the sensitive neurons of the dorsal root ganglia, thus getting around a critical point in the design of conduits for nerve regeneration.
993.
Riccardo Narizzano Fulvia Risso Alfredo Magherini Emanuele Magi Michele Giampieri Carla Devia Gloria Venturelli Eugenio Carlini 《Analytical and bioanalytical chemistry》2013,405(2-3):1115-1121
In the context of the entire analytical process, pre-treatment of soil samples is often inadequately considered although the reliability of the results is definitely compromised if the sample is not properly prepared. In this paper, the effect of drying conditions in soil sample pre-treatment on the determination of polycyclic aromatic hydrocarbons (PAHs) has been studied. A systematic approach has been adopted by varying soil type, drying temperatures and solvent polarity to highlight the effect on the analyte recovery; the relationship between PAH molecular structure and their evaporation process from soils is discussed. Experimental data demonstrate that, concerning temperature-assisted drying procedures, PAHs are divided in two distinct groups: PAHs lighter than pyrene, which are seriously affected by drying temperature; and heavier PAHs that can be considered as non-volatile compounds. For studies involving the analysis of lighter PAHs in environmental samples, working on as-received samples is necessary. 相似文献
994.
Guangcai Xu Dr. Michele Crotti Dr. Thangavelu Saravanan Kim M. Kataja Prof. Dr. Gerrit J. Poelarends 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(26):10460-10464
Peroxygenases are heme-dependent enzymes that use peroxide-borne oxygen to catalyze a wide range of oxyfunctionalization reactions. Herein, we report the engineering of an unusual cofactor-independent peroxygenase based on a promiscuous tautomerase that accepts different hydroperoxides (t-BuOOH and H2O2) to accomplish enantiocomplementary epoxidations of various α,β-unsaturated aldehydes (citral and substituted cinnamaldehydes), providing access to both enantiomers of the corresponding α,β-epoxy-aldehydes. High conversions (up to 98 %), high enantioselectivity (up to 98 % ee), and good product yields (50–80 %) were achieved. The reactions likely proceed via a reactive enzyme-bound iminium ion intermediate, allowing tweaking of the enzyme's activity and selectivity by protein engineering. Our results underscore the potential of catalytic promiscuity for the engineering of new cofactor-independent oxidative enzymes. 相似文献
995.
Prof. Dr. Christer B. Aakeröy Dr. Michele Baldrighi Dr. John Desper Prof. Dr. Pierangelo Metrangolo Prof. Dr. Giuseppe Resnati 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(48):16240-16247
Through a combination of structural chemistry, vibrational spectroscopy, and theory, we have systematically examined the relative structure‐directing importance of a series of ditopic halogen‐bond (XB) donors. The molecular electrostatic potential surfaces of six XB donors were evaluated, which allowed for a charge‐based ranking. Each molecule was then co‐crystallized with 21 XB acceptors and the results have made it possible to map out the supramolecular landscape describing the competition between I/Br–ethynyl donors, perfluorinated I/Br donors, and I/Br–phenyl based donors. The results offer practical guidelines for synthetic crystal engineering driven by robust and directional halogen bonds. 相似文献
996.
An electronic nose and an UV-Vis spectrophotometer, in combination with multivariate analysis, have been used to verify the geographical origin of extra virgin olive oils. Forty-six oil samples from three different areas of Liguria were included in this analysis.Initially, the data obtained from the two instruments were analysed separately. Then, the potential of the synergy between these two technologies for testing food authenticity and quality was investigated.Application of Linear Discriminant Analysis, after feature selection, was sufficient to differentiate the three geographical denominations of Liguria (“Riviera dei Fiori”, “Riviera del Ponente Savonese” and “Riviera di Levante”), obtaining 100% success in classification and close to 100% in prediction. The models built using SIMCA as a class-modelling tool, were not so effective, but confirmed that the results improve using the synergy between different analytical techniques.This paper shows that objective instrumental data related to two important organoleptic features such as oil colour and aroma, supply complementary information. 相似文献
997.
Michele Kelley Nicholas Bryden Sebastian William Atalla Rosa Tamara Branca 《Chemphyschem》2023,24(19):e202300284
Ultra-low field nuclear magnetic resonance spectroscopy (NMR) and imaging (MRI) inherently suffer from a low signal-to-noise ratio due to the small thermal polarization of nuclear spins. Transfer of polarization from a pre-polarized spin system to a thermally polarized spin system via the Spin Polarization Induced Nuclear Overhauser Effect (SPINOE) could potentially be used to overcome this limitation. SPINOE is particularly advantageous at ultra-low magnetic field, where the transferred polarization can be several orders of magnitude higher than thermal polarization. Here we demonstrate direct detection of polarization transfer from highly polarized 129Xe gas spins to 1H spins in solution via SPINOE. At ultra-low field, where thermal nuclear spin polarization is close to background noise levels and where different nuclei can be simultaneously detected in a single spectrum, the dynamics of the polarization transfer can be observed in real time. We show that by simply bubbling hyperpolarized 129Xe into solution, we can enhance 1H polarization levels by a factor of up to 151-fold. While our protocol leads to lower enhancements than those previously reported under extreme Xe gas pressures, the methodology is easily repeatable and allows for on-demand enhanced spectroscopy. SPINOE at ultra-low magnetic field could also be employed to study 129Xe interactions in solutions. 相似文献
998.
Linden James Samara Meropi Decker Stephen Johnson Ellen Boyer Michele Pecs Mlklos Adney William Himmel Michael 《Applied biochemistry and biotechnology》1994,45(1):383-393
Applied Biochemistry and Biotechnology - Optimized acetyl esterase enzyme production conditions usingAspergillus niger ATCC 10864 in 14-L fermentation jars were determined to be 33?C, 1.5 vvm... 相似文献
999.
1000.
We study the problem of an elastic shell-like inclusion with high rigidity in a three-dimensional domain by means of the asymptotic
expansion method. The analysis is carried out in a general framework of curvilinear coordinates. After defining a small real
adimensional parameter ε, we characterize the limit problems when the rigidity of the inclusion has order of magnitude
\frac1e\frac{1}{\varepsilon } and
\frac1e3\frac{1}{\varepsilon^{3}} with respect to the rigidities of the surrounding bodies. Moreover, we prove the strong convergence of the solution of the
initial three-dimensional problem towards the solution of the simplified limit problem. 相似文献