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277960 documents, page 1 of 27796

Chemistry of Substituted Quinolinones. Part VI. Synthesis and Nucleophilic Reactions of 4-Chloro-8-methylquinolin-2(1H)-one and its Thione Analogue

The synthesis of 4-chloro-8-methylquinolin-2(1H)-one and its thione analogue is described. Some nucleophilic substitution reactions of the 4-chloro group were carried out to get new 4-substituted 2-quinolinones and quinolinethiones, such as 4-sulfanyl, hydrazino, azido and amino derivatives, which are of important synthetic use. The structure of the new compounds was established by their elemental analysis, IR and 1H-NMR spectra. Also the mass fragmentation pattern of some products is discussed.

Mixed Logic and Storage Operators

International audience; In 1990 J-L. Krivine introduced the notion of storage operators. They are $\lambda$-terms which simulate call-by-value in the call-by-name strategy and they can be used in order to modelize assignment instructions. J-L. Krivine has shown that there is a very simple second order type in AF2 type system for storage operators using Gödel translation of classical to intuitionistic logic. In order to modelize the control operators, J-L. Krivine has extended the system AF2 t...

Polyhedral Properties of the Uncapacitated Multiple Allocation Hub Location Problem

We examine the feasibility polyhedron of the uncapacitated hub location problem (UHL) with multiple allocation, which has applications in the fields of air passenger and cargo transportation, telecommunication and postal delivery services. In particular we determine the dimension and derive some classes of facets of this polyhedron. We develop some general rules about lifting facets from the uncapacitated facility location (UFL) for UHL and projecting facets from UHL to UFL. By applying these...

Inundaciones de ramblas y barrancos en las tierras valencianas (1980-1999) : causas, procesos y espacios inundables

En este trabajo se analizan los ocho episodios de inundaciones más importantes ocurridos en el País Valenciano durante los últimos 20 años. El análisis de la situación sinóptica que han provocado las precipitaciones extraordinarias demuestra que el paso de las depresiones o vaguadas frías del Jet Stream en otoño no ha sido siempre el factor responsable. La rapidez de la respuesta hidrológica, característica de las avenidas súbitas, se ha hecho evidente la mayor parte de los episodios se...

The Contribution of Field OB Stars to the Ionization of the Diffuse Ionized Gas in M33

(Abridged) We present a study of the ionizing stars associated with the diffuse ionized gas (DIG) and HII regions in the nearby spiral galaxy M33. We compare our Schmidt H-alpha image to the far-ultraviolet (FUV, 1520A) image from the Ultraviolet Imaging Telescope (UIT). The H-alpha/FUV ratio is higher in HII regions than in the DIG, suggesting an older population of ionizing stars in the DIG. When compared to models of evolving stellar populations, the N(Lyc)/FUV ratio in HII regions is cons...

BCL-2 family protein expression and platinum drug resistance in ovarian carcinoma

The expression of the BCL-2 family proteins, BCL-2, BAX, BCLXLand BAK have been determined in a panel of 12 human ovarian carcinoma cell lines encompassing a wide range in sensitivity to cisplatin. Whereas BAX, BCLXLand BAK levels did not correlate with sensitivity, there was a statistically significant inverse correlation (r = ?0.81;P = 0.002) between growth inhibition by cisplatin and BCL-2 levels. In sublines possessing acquired resistance to various platinum-based drugs or across a panel ...

Experimental search for molecular-nuclear transitions in water

Experimental search for molecular-nuclear transitions H_2O\to^{18}Ne^*(4.522,1^-)\to^{18}F\to^{18}O in water molecules was carried out. The measurements were performed in a low-background laboratory at the Baksan Neutrino Observatory. Under the assumption that the above transitions take place, the estimate for the half-life time of water molecule was found to be about 10^{18} years.

Willingness to pay for rural landscape preservation: A case study in Mediterranean agriculture

In this paper we present welfare estimates from a contingent valuation (CV) study which investigates the potential benefits derived by tourists from the implementation of a programme aimed at preserving the traditional agricultural landscape in a typical Mediterranean area: the National Park of Cilento (Southern Italy). Here, under current market conditions, farming activities are being gradually abandoned. As a result, the alternative to the cultivated landscape is a much less appealing one,...

Validating a framework for participatory ergonomics

Recognising the diversity of Participatory Ergonomics (PE) and the need for better research and practice guidance, the Health and Safety Executive in the UK commissioned a guidance document. A modified set of dimensions has now been produced as a conceptual framework for understanding PE. In this paper the framework is validated within a structured exercise, involving case studies previously carried out by peers of TNO Work and Employment. Thus the framework has been produced in the UK and be...