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Fan W Young M Canino J Smith J Oxley J Almirall JR 《Analytical and bioanalytical chemistry》2012,403(2):401-408
Triacetone triperoxide (TATP) is a high explosive synthesized from easily available reactants making it accessible for illicit
uses. In this study, fast detection of TATP is achieved using a novel planar solid-phase microextraction (PSPME) as a preconcentration
and sampling device for headspace analysis offering improved sensitivity and reduced sampling time over the conventional fiber-based
solid-phase microextraction (SPME) when followed by ion mobility spectrometer (IMS) detection. Quantitation and comparison
of the retention capabilities of PSPME as compared to the commercially available SPME were determined using TATP standards
and analyzed using gas chromatography–mass spectrometry for SPME analysis and a commercial IMS with no instrumental modification
for PSPME. Static and dynamic headspace extractions were used and compared for PSPME extractions, in which low milligram quantities
of TATP were detected within 30 s of static mode sampling and less than 5 s in the dynamic mode sampling for PSPME–IMS. 相似文献
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Acid catalyzed nitration has been examined using a variety of novel nitration agents: guanidine nitrate (GN) and nitroguanidine (NQ) as well as the simple nitrate ester, ethylene glycol dinitrate (EGDN). Reactions with either activated or deactivated aromatic substrates proceed rapidly and in high yield. Regioselectivity was similar for all nitrating agents examined. The synthetic advantages of liquid EGDN include high solubility in organic solvents, strong nitration activity and ease of preparation. 相似文献
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Federica Marra Beatrix Petrovicova Francesco Canino Angela Maffia Carmelo Mallamaci Adele Muscolo 《Molecules (Basel, Switzerland)》2022,27(17)
Pomegranate use is increasing worldwide, as it is considered a tasteful healthy food. It is mainly used as fruit, juice, and jam. The pomegranate peel represents about 40–50% of the total fruit weight and contains numerous and diverse bioactive substances. The aim of this research was to analyze the pomegranate peel chemical composition of Wonderful cultivated in Southern Italy and treated with an innovative physic dry concentration procedure in comparison with the peel composition of freeze-dried Wonderful cultivated in Southern Italy, freeze-dried Wonderful cultivated in South Africa, and freeze-dried pomegranate cultivated in India. The specific aim was to verify how much the growth area, cultivar type, and dry procedure influenced the chemical composition of the peels in terms of valuable bioactive compounds. Spectrophotometric and HPLC identification methods were used to detect antioxidants, antioxidant activities, and phenolic and flavonoid components. Results evidenced that in pomegranate peels of Wonderful cultivated in Calabria and dried with the innovative process, total phenolic substances, total flavonoids, vitamin C, vitamin E, and antioxidant activities were the highest. Great amounts of single phenolic acids and flavonoids were found in Calabrian Wonderful peels dried with the innovative process. Overall, it emerged that a great amount of bioactive and diverse compounds found in Calabrian Wonderful pomegranate peel comes from the niche pedoclimatic conditions, and the physic drying innovative methodology turned out to be an advantageous procedure to concentrate and conserve biocompounds. 相似文献
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Massimo Camarda Antonino La Magna Andrea Canino Francesco La Via 《Surface science》2010,604(11-12):939-942
Three dimensional kinetic Monte Carlo simulations on super-lattices are applied to study the evolution of stacking faults during epitaxial growths. We show that, in the case of misoriented close packed substrates, these defects can either extend throughout the entire epilayer (i.e. extended from the substrate up to the surface) or close in dislocation loops, in dependence of the deposition conditions. We explain this behavior in terms of a surface kinetic competition between these defects and the surrounding crystal: if the local growth rate of the defect is larger compared with that of the perfect crystal the defect will expands, otherwise it will closes. This mechanisms allows to explain several experimental results on homo and hetero epitaxies. 相似文献
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Annamaria Canino 《Annali di Matematica Pura ed Applicata》1991,159(1):17-44
Summary We prove some local properties of geodesics on p-convex sets. First of all, we give an intrinsic characterization of geodesic in terms of local minimality for the energy functional. Then, we prove local uniqueness and continuous dependence from extrema for geodesics with assigned endpoints. Further, we show a consequence of these results. 相似文献
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José A Herrera Carlos A Canino Lilia López-Cánovas Regnar Gigato Ana Maria Riverón 《Electrophoresis》2003,24(7-8):1137-1144
We redesigned contour-clamped homogeneous electric field (CHEF) circuitry to eliminate crossover distortion, to set identical potentials at electrodes of each equipotential pair and to drive pairs with transistors in emitter follower stages. An equipotential pair comprised the two electrodes set at the same potential to provide electric field homogeneity inside of the hexagonal array. The new circuitry consisted of two identical circuits, each having a resistor ladder, diodes and transistors. Both circuits were interconnected by diodes that controlled the current flow to electrodes when the array was energized in the 'A' or 'B' direction of the electric field. The total number of transistors was two-thirds of the total number of electrodes. Average voltage deviation from potentials expected at electrodes to achieve a homogeneous electric field was 0.06 V, whereas 0.44 V was obtained with another circuit that used transistors in push-pull stages. The new voltage clamp unit is cheap, generated homogeneous electric field, and gave reproducible and undistorted DNA band patterns. 相似文献
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We study ${W^{2,m(\cdot)}_{loc}}$ regularity for local weak solutions of p(·)-Laplace equations where ${p\in C^1(\Omega) \cap C(\overline{\Omega})}$ and ${\min_{x\in \overline{\Omega}} p(x) > 1}$ . 相似文献
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Annamaria Canino Berardino Sciunzi Alessandro Trombetta 《NoDEA : Nonlinear Differential Equations and Applications》2016,23(2):8
We consider quasilinear elliptic equations involving the p-Laplacian and singular nonlinearities. We prove comparison principles and we deduce some uniqueness results. 相似文献
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Annamaria Canino Francesco Esposito Berardino Sciunzi 《Journal of Differential Equations》2019,266(9):5488-5499
In this paper we consider positive solutions to semilinear elliptic problems with singular nonlinearity. We provide a Höpf type boundary lemma via a suitable scaling argument that allows to deal with the lack of regularity of the solutions up to the boundary. 相似文献