187 research outputs found
Multiple cutaneous and hepatic infantile hemangiomas having a successful response to propranolol as monotherapy at neonatal period
No full textInfantile hepatic hemangioma (IHH) is a common liver tumors of infancy with a higher incidence in females. Various treatments for infantile hepatic hemangioma such as systemic corticosteroids, interferon-alpha, vincristine and cyclophosphamide have been suggested, though no consensus exists about the first-choice treatment. Recent evidences suggest that propranolol, a nonselective β-blocker, may be effective and safe as first-line therapy for infantile hepatic hemangioma. We report a case of female born at term with a weight of 2.450 g started to develop multiple cutaneous IHs at 10 days of age and presenting concomitant multiple cutaneous and hepatic infantile hemangiomas confirmed on magnetic resonance imaging. Propranolol, used as monotherapy, was started at 14 days of age at a dose of 2 mg/kg/day orally and maintained for 6 months. Patient was monitored in the hospital during first days of treatment with propranolol, and discharged after no side-effects were detected. Hepatic and cutaneous lesions had complete resolution in three months, although the fibro-fatty residuum of largest cutaneous nodule was still palpable at month 6. A further control after 6 months showed no recurrences. Our report case suggests that propranolol can be a safe and effective first-line therapy for neonates with concomitant multiple cutaneous and hepatic infantile hemangiomas
Surface Organometallic Chemistry Applied To The Preparation Of Well Defined Heterogeneous Catalysts [química Organometálica De Superfície Aplicada à Preparação De Catalisadores Heterogêneos Bem Definidos]
No full textThe study of the reactions of organometallic complexes with the surfaces of inorganic oxides, zeolites and metals constitutes the basis of Surface Organometallic Chemistry (SOMC). The basic rules of organometallic chemistry are often valid when applied to surfaces and well-defined surface organometallic complexes can be obtained. These complexes can be used as heterogeneous catalysts or, by controlled reactions, can be transformed in other species useful for a given catalytic reaction. In some cases, these catalysts exhibit higher activity and/or selectivity than their analogous molecular complexes.256 A985994Basset, J.-M., Gates, B.C., Candy, J.P., Choplin, A., Leconte, M., Quignard, F., Santini, C., (1988) Surface Organometallic Chemistry: Molecular Approaches to Surface Catalysis, , Kluwer Academic Publishers: AmsterdamYermakov, Y.I., (1980) Pure Appl. Chem., 52, p. 2075Candlin, J.P., Thomas, H., (1974) Adv. Chem. 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Tumor lysis syndrome after propranolol therapy in ulcerative infantile hemangioma : rare complication or incidental finding?
No full textA 33-day-old female with an ulcerated infantile hemangioma (IH) undergoing oral therapy with propranolol 2 mg/kg per day developed hyperkalemia and hyperphosphatemia 24 h after starting medication. No electrocardiographic or clinical abnormalities secondary to the electrolyte changes were noticed. A laboratory tumor lysis syndrome (TLS) was diagnosed after excluding other causes of electrolyte imbalance in the diagnostic workup. No treatment was required to reverse the TLS condition, and the propranolol therapy was continued as the electrolyte alterations were only mild. One month later, the IH was remarkably reduced in size and no longer ulcerated. Maintenance of propranolol was extended for a total of 6 months. Parallel to the gradual involution of the IH, serum potassium and phosphorus levels returned within normal levels. We suggest that TLS may be a rare complication of ulcerated IH treated with propranolol. Clinicians must be aware and order appropriate screening tests for TLS in patients at risk. CopyrightA 33-day-old female with an ulcerated infantile hemangioma (IH) undergoing oral therapy with propranolol 2 mg/kg per day developed hyperkalemia and hyperphosphatemia 24 h after starting medication. No electrocardiographic or clinical abnormalities secondary to the electrolyte changes were noticed. A laboratory tumor lysis syndrome (TLS) was diagnosed after excluding other causes of electrolyte imbalance in the diagnostic workup. No treatment was required to reverse the TLS condition, and the propranolol therapy was continued as the electrolyte alterations were only mild. One month later, the IH was remarkably reduced in size and no longer ulcerated. Maintenance of propranolol was extended for a total of 6 months. Parallel to the gradual involution of the IH, serum potassium and phosphorus levels returned within normal levels. We suggest that TLS may be a rare complication of ulcerated IH treated with propranolol. Clinicians must be aware and order appropriate screening tests for TLS in patients at ris
Comparing In Vivo Reflectance Confocal Microscopy, Dermoscopy, and Histology of Clear-Cell Acanthoma
No full textClear cell acanthoma (CCA) is a rare, benign neoplasm of unknown etiology, whose dermoscopic and histological features have been previously described. Usually, CCA can be diagnosed by clinical and dermoscopic examination. In some cases, diagnosis remains uncertain, and histological examination is needed. The aim of this paper was to describe the features of reflectance confocal microscopy (RCM) in diagnosing CCA, compare them with findings on dermoscopy and histology, and evaluate their possible usefulness in CCA evaluation. Five lesions diagnosed clinically as CCA were imaged using dermoscopy and RCM. All lesions were surgically excised to confirm the diagnosis and compare the morphological attributes under light microscopy with in vivo imaging. RCM showed well-circumscribed lesions, often edged by a hyperkeratotic collarette with parakeratosis; inflammatory cells in the spinous layer; large keratinocytes; acanthosis with papillomatosis; epidermal disarray; and dilated capillaries forming glomeruloid shapes in the upper dermis. In this small study, RCM was able to identify most of the established diagnostic histological features of CCA. RCM appears to be a useful tool for in vivo diagnosis of CCA and may help avoid unnecessary biopsies
Surface Organometallic Chemistry Of D(0) Metal Complexes
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Finitude Before Finitude: The case of Rousseau-Bougainville-Diderot
No full textTahiti is synonymous with a long history of exoticism in French thought. Soon after the publication of Bougainville’s travel accounts, it quickly became rightly or wrongly the epitome of Rousseau’s state of nature, and also led to the development of anthropology before anthropology. In this paper, I attempt to reconstruct the discussion between Rousseau, Bougainville and Diderot about exoticism and otherness, and examine the consequences of the 'discovery' of Tahiti for French thought at the time
Facts, Norms and Expected Utility Functions
No full textIn this paper we want to explore an argumentative pattern that provides a normative justification for expected utility functions grounded on empirical evidence, showing how it worked in three different episodes of their development. The argument claims that we should prudentially maximize our expected utility since this is the criterion effectively applied by those who are considered wisest in making risky choices (be it gamblers or businessmen). Yet, to justify the adoption of this rule, it should be proven that this is empirically true: i.e., that a given function allows us to predict the choices of that particular class of agents. We show how expected utility functions were introduced and contested in accordance to this pattern in the 18th century and how it recurred in the 1950s when M. Allais made his case against the neobernoullians.Expected utility;Normative theory;
Heterogenization Of H6pmo9v3o40 And Palladium Acetate In Vpi-5 And Mcm-41 And Their Use In The Catalytic Oxidation Of Benzene To Phenol
No full textThe heteropolyacid H6PMo9V3O40 (HPA) was encapsulated in MCM-41 and VPI-5. When HPA/MCM-41 is used in the direct oxidation of benzene to phenol, the heteropolyacid leaches from the MCM-41 and oxidation takes place in the homogeneous phase. VPI-5 retains the HPA and palladium acetate more efficiently than MCM-41, and can be used as a heterogeneous oxidation catalyst for benzene. However, its activity is very low since only the active species at the pore entrances of VPI-5 are accessible to the reactants.1341-3229235Passoni, L.C., Cruz, A.T., Buffon, R., Schuchardt, U., (1997) J. Mol. Catal. A, 120, p. 117Tsigdinos, G.A., Hallada, C.J., (1968) Inorg. Chem., 7, p. 437Beck, J.S., Vartuli, J.C., Roth, W.J., Leonowicz, M.E., Kresge, C.T., Schmitt, K.D., Chu, C.T.-W., Schlenker, J.L., (1992) J. Am. Chem. Soc., 114, p. 10834Davis, M.E., Montes, C., Hathaway, P.E., Garces, J.M., (1989) Stud. Surf. Sci. Catal., 49, p. 199Kozhevnikov, I.V., Sinnema, A., Jansen, R.J.J., Pamin, K., Van Bekkum, H., (1995) Catal. Lett., 30, p. 241Ryoo, M.-H., Chon, H., (1997) Microporous Mater., 10, p. 35Parton, R.F., Thibault-Starzyk, F., Reynders, R.A., Grobet, P.J., Jacobs, P.A., Bezoukhanova, C.P., Sun, W., Wu, Y., (1995) J. Mol. Catal. A, 97, p. 183Meier, W.M., Olson, D.H., (1992) Zeolites, 12, p. 449Akporiaye, D., Stöcker, M., (1992) Zeolites, 12, p. 351Martens, J.A., Feijen, E., Lievens, J.L., Grobet, P.J., Jacobs, P.A., (1991) J. Phys. Chem., 95, p. 10025Perez, J.O., Chen, P.J., Clearfield, A., (1991) J. Phys. Chem., 55, p. 9994Sulikowski, B., Haber, J., Kubacka, A., Pamin, K., Olejniczak, Z., Ptaszynski, J., (1996) Catal. Lett., 39, p. 27Kozhevnikov, I.V., (1987) Russ. Chem. Rev., 56, p. 81
Surface Organometallic Chemistry Of Vanadium(v): Reactivity Of (butn=)vnp3 Towards Silica
No full textThe reaction of (ButN=)VNp3 towards silica dehydroxylated at 773 K was studied by in situ FT-IR, 13C CP-MAS NMR, 51V MAS NMR, ESR, chemical analysis of the evolved gases and chemical reactivity. Upon heating at 323 K under static vacuum at least four surface organometallic vanadium species are formed. However, after treatment at 373 K under vacuum (SiO)2V(=NBut)Np (B) appears to be the major surface species. This species reacts with neopentane, at 423 K, via a C-H addition to the V=N bond. Heating of B under hydrogen does not lead to surface vanadium hydride species but, presumably, to hydrogenolysis of SiO-V bonds, elimination of NH2But and formation of ionic surface species, [SiO]-[ButNH3]+. © 2001 Elsevier Science B.V.6251101107Choplin, A., Basset, J.-M., (1981) J. Mol. Catal., 23, p. 21. , (a)Basset, J.-M., Gates, B.C., Candy, J.-P., Choplin, A., Leconte, M., Quignard, F., Santini, C.C., (1988) Surface Organometallic Approaches to Surface Catalysis, , (b) (Eds.), Kluwer, DordrechtLamb, H., Gates, B.C., Knözinger, H., (1988) Angew. Chem. Int. Ed. Engl., 27, p. 1127. , (c)Scott, S.L., Basset, J.-M., Niccolai, G.P., Santini, C.C., Candy, J.-P., Lécuyer, C., Quignard, F., Choplin, A., (1994) New J. Chem., 18, p. 115. , (d)Choplin, A., Quignard, F., (1998) Coord. Chem. Rev., 180, p. 1679. , (e)Basset, J.-M., Lefebvre, F., Santini, C., (1998) Coord. Chem. Rev., 180, p. 1703. , (f)Quignard, F., Lécuyer, C., Bougault, C., Lefebvre, F., Choplin, A., Basset, J.-M., (1992) Inorg. Chem., 31, p. 928. , (a)Rosier, C., Niccolai, G.P., Basset, J.M., (1997) J. Am. Chem. Soc., 119, p. 12408. , (b)D'Ornelas, L., Reyes, S., Quignard, F., Choplin, A., Basset, J.-M., (1993) Chem. Lett., p. 1931. , (c)Dufaud, V., Nicolai, G.P., Thivolle-Cazat, J., Basset, J.-M., (1995) J. Am. Chem. Soc., 117, p. 4288. , (d)Ajjou, J.A., Scott, S.L., Paquet, V., (1998) J. Am. Chem. Soc., 120, p. 415. , (e)Buffon, R., Leconte, M., Choplin, A., Basset, J.-M., (1994) J. Chem. Soc. Dalton Trans, p. 1723. , (f)Corker, J., Lefebvre, F., Lécuyer, C., Dufaud, V., Quignard, F., Choplin, A., Evans, J., Basset, J.-M., (1996) Science, 271, p. 966. , and refs. thereinDufaud, V., Basset, J.-M., (1998) Angew. Chem. Int. Ed. Engl., 37, p. 806Vidal, V., Théolier, A., Thivolle-Cazat, J., Basset, J.-M., (1997) Science, 276, p. 99. , (a)Maury, O., Lefort, L., Vidal, V., Thivolle-Cazat, J., Basset, J.-M., (1999) Angew. Chem. Int. Ed., 38, p. 1952. , (b)Ajjou, J.A.N., Rice, G.L., Scott, S.L., (1998) J. Am Chem. Soc., 120, p. 13436De With, J., Horton, A.D., (1993) Angew. Chem. Int. Ed. Engl., 32, p. 903Psaro, R., Ugo, R., Besson, B., Smith, A.K., Basset, J.-M., (1981) J. Organomet. Chem., 213, p. 215Vogel, A.I., (1961) A Textbook of Quantitative Inorganic Analysis, , London: LongmanPreuss, F., Overhoff, G., Becker, H., Häusler, H.J., Frank, W., Reiß, G., (1993) Z. Anorg. Allg. Chem., 619, p. 1827Preuss, F., Becker, H., Wieland, T., (1990) Z. Naturforsch. Teil B, 45, p. 191Curtis, J., Smart, J.C., Robbins, J.L., (1985) Organometallics, 4, p. 1283Hessen, B., Van Bolhuis, F., Teuben, J.H., (1988) J. Am. Chem. Soc., 110, p. 295Gallas, J.P., Lavalley, J.C., Burneau, A., Barres, O., (1991) Langmuir, 7, p. 1235Cheon, J., Rogers, D.M., Girolami, G.S., (1997) J. Am. Chem. Soc., 119, p. 6804Schaller, C.P., Cummins, C.C., Wolczanski, P.T., (1996) J. Am. Chem. Soc., 118, p. 591Schaller, C.P., Cummins, C.C., Wolczanski, P.T., (1993) Inorg. Chem., 32, p. 131Vidal, V., Théolier, A., Thivolle-Cazat, J., Basset, J.-M., Corker, J., (1996) J. Am. Chem. Soc., 118, p. 4595Roddick, D.M., Frizuk, M.D., Seidler, P.F., Hillhouse, G.L., Bercaw, J.E., (1985) Organometallics, 4, p. 97Thompson, M.E., Bexter, S.M., Bulls, A.R., Burger, B.J., Nolan, M.C., Santarsiero, B.D., Schaefer, W.P., Bercaw, J.E., (1987) J. Am. Chem. Soc., 109, p. 203Quignard, F., Lécuyer, C., Choplin, A., Olivier, D., Basset, J.-M., (1992) J. Mol. Catal., 74, p. 353Silverstein, R.M., Bassler, G.C., Morrill, T.C., (1991) Spectrometry Identification of Organic Compounds 5th Edn., , New York: Wile
On The Interaction Of Schrock Mo-alkylidene Complexes With The Surface Of Inorganic Oxides
No full textThis work describes the reactivity of Schrock-type alkylidenemolybdenum(VI) complexes, Mo(= CHCPhMe2)(= NAr)(O(t)Bu)2, I, or Mo(= CHCPhMe2)(= NAr)[OCMe(CF3)2]2, II, with the surface of silica, silica-alumina and niobia. In situ FT-IR studies suggest that I and II are attached to the surface of silica via a Lewis acid base adduct; on silica-alumina, an OH addition to the Mo=N bond seems to take place. Grafting of I and II causes a decrease in their intrinsic catalytic activity as well as a change in the stereoselectivity of II in ROMP of norbornene. (C) 2000 Elsevier Science B.V.1601181187Choplin, A., Basset, J.-M., (1981) J. Mol. Catal., 23, p. 21Basset, J.-M., Gates, B.C., Candy, J.-P., Choplin, A., Leconte, M., Quignard, F., Santini, C.C., (1988), Surface Organometallic Approaches to Surface Catalysis, Kluwer Academic Publishing, AmsterdamLamb, H., Gates, B.C., Knozinger, H., Choplin, A., (1988) Angew. Chem., Int. Ed. Engl., 27, p. 1127Scott, S.L., Basset, J.-M., Niccolai, G.P., Santini, C.C., Candy, J.-P., Lecuyer, C., Quignard, F., (1994) New J. Chem., 18, p. 115Choplin, A., Quignard, F., (1998) Coord. Chem. Rev., 180, p. 1679Basset, J.-M., Lefebvre, F., Santini, C., (1998) Coord. Chem. Rev., 180, p. 1703Ivin, K.J., Mol, J.C., (1997), Olefin Metathesis and Metathesis Polymerization, Academic Press, New YorkShelimov, B.N., Elev, I.V., Kazansky, V.B., (1988) J. Mol. Catal., 46, p. 187Vikulov, K.A., Elev, I.V., Shelimov, B.N., Kazansky, V.B., (1989) Catal. Lett., 2, p. 121Buffon, R., Schuchardt, U., Abras, A., (1995) J. Chem. Soc. Faraday Trans., 91, p. 3511Weiss, K., Lossel, G., (1989) Angew. Chem., Int. Ed. Engl., 28, p. 62Buffon, R., Choplin, A., Leconte, M., Basset, J.-M., Touroude, R., Herrmann, W.A., (1992) J. Mol. Catal., 72, pp. L7Buffon, R., Leconte, M., Choplin, A., Basset, J.-M., (1994) J. Chem. Soc., Dalton Trans., p. 1723Dufaud, V., Niccolai, G.P., Thivolle-Cazat, J., Basset, J.-M., (1995) J. Am. Chem. Soc., 117, p. 4288Ajjou, J.A.N., Scott, S.L., Paquet, V., (1988) J. Am. Chem. Soc., 120, p. 415Aguero, A., Kress, J., Osborn, J.A., (1985) Chem. Soc., Chem. Commun., p. 793Rajagopal, S., Marini, H.J., Marzari, J.A., Miranda, R., (1994) J. Catal., 147, p. 417Rajagopal, S., Marzari, J.A., Miranda, R., (1995) J. Catal., 151, p. 192Buffon, R., (1992), PhD Dissertation, Universite Claude Bernard, FrancePsaro, R., Ugo, R., Besson, B., Smith, A.K., Basset, J.-M., (1981) J. Organomet. Chem., 213, p. 215Nedez, C., Theolier, A., Lefebvre, F., Choplin, A., Basset, J.-M., Joly, J.F., (1993) J. Am. Chem. Soc., 115, p. 722Fox, H.H., Lee, J.-K., Park, L.Y., Schrock, R.R., (1993) Organometallics, 12, p. 759Schrock, R.R., Murdzek, J.S., Bazan, G.C., Robbins, J., Dimare, M., O'Regan, M., (1990) J. Am. Chem. Soc., 112, p. 3875Schrock, R.R., Krouse, S.A., Knoll, K., Feldman, J., Murdzek, J.S., Yang, D.C., (1988) J. Mol. Catal., 46, p. 243Schrock, R.R., Feldman, J., Cannizzo, L.F., Grubbs, R.H., (1987) Macromolecules, 20, p. 116
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