Testing color evaporation in photon-photon production of J/psi at CERN LEP II

The DELPHI Collaboration has recently reported the measurement of J/psi production in photon-photon collisions at CERN LEP II. These newly available data provide additional proof of the importance of colored c (c) over bar pairs for the production of charmonium, because these data can be explained only by considering resolved photon processes. We show here that the inclusion of color octet contributions to J/psi production in the framework of the color evaporation model is able to reproduce these data. In particular, the transverse-momentum distribution of the J/psi mesons is well described by this model.

Analog Model for Quantum Gravity Effects: Phonons in Random Fluids

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Stochastic quantization of real-time thermal field theory

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

A simple and green analytical method for determination of glyphosate in commercial formulations and water by diffuse reflectance spectroscopy

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

An environmentally friendly reflectometric method for ranitidine determination in pharmaceuticals and human urine

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Detection of propranolol in pharmaceutical formulations by diffuse reflectance spectroscopy

This paper describes an analytical reflectometric method that has an objective not only the industrial quality control but also to detect possible falsifications and/or adulterations of propranolol in pharmaceutical formulations. The method is based on the diffuse reflectance measurements of the colored product (III) of the spot test reaction between propranolol hydrochloride (I) and 2,6-dichloroquinone-4-chloroimide (II) using filter paper as solid support. Spot test conditions have been investigated using experimental design in order to identify and optimize the critical factors. The factors evaluated were DCQ concentration, propranolol solvent and DCQ solvent. The best reaction conditions were achieved with the addition of 30 mu L, of propranolol solution in ethanol 35% (v/v) and 30 mu L of DCQ solution at 70 mg mL(-1) in acetone, in this order. All reflectance measurements were carried out at 500 nm and the linear range was from 8.45 x 10(-4) to 8.45 x 10(-2) mol L-1 (r= 0.998). The limit of detection was 1.01 x 10(-4) mol L-1. No interference was observed from the assessed excipients and drugs. The method was applied to determine propranolol in commercial brands of pharmaceuticals. The results obtained by the proposed method were favorably compared with those given by the British Pharmacopoeia procedure. (C) 2007 Elsevier B.V. All rights reserved.

Corantes têxteis

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Determinação espectrofotométrica de ácido glicólico com ácido cromotrópico assistida por forno de microondas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Sequential injection analysis system with spectrophotometric detection for determination of norfloxacin and ciprofloxacin in pharmaceutical formulations

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Determination of hydrochlorothiazide in pharmaceutical formulations by diffuse reflectance spectroscopy

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Determination of ambroxol in syrups using diffuse reflectance spectroscopy

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Determinação espectrofotométrica por injeção em fluxo de glifosato em formulações comerciais de herbicidas

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Desenvolvimento de um método reflectométrico ambientalmente mais amigável para a determinação de metoclopramida em formulações farmacêuticas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Modos de aplicação de regulador vegetal no algodoeiro, cultivar IAC-22, em diferentes densidades populacionais e níveis de nitrogênio em cobertura

Este trabalho foi desenvolvido nos anos agrícolas de 1996/97, 1997/98, 1998/99 e 1999/00, em experimentos de campo nas localidades de Ribeirão Preto, Tietê, Guaíra, Campinas e Ilha Solteira, no Estado de São Paulo. O delineamento experimental empregado foi o de blocos ao acaso com doze tratamentos arranjados em um esquema fatorial 3 x 2 x 2, visando estudar densidade de plantas (6 ; 10 e 14 plantas por metro); doses de nitrogênio em cobertura (40 e 60 kg.ha-1 de N) e modos de aplicação de regulador vegetal, com aplicação única, no início do florescimento ou parcelada em 4 vezes, desde o desbaste. O sistema de aplicação parcelada propiciou altura média de planta inferior e massa média de capulhos superior àquele obtido com a aplicação única do regulador. A aplicação da maior dose de N implicou obtenção dos maiores valores de N foliar e produtividade de algodão em caroço, bem como menor porcentagem de fibra. O aumento da densidade de plantas de 6 para 10 e 14 plantas por metro, ocasionou redução da porcentagem de fibra e da massa de capulhos.

Chromatic alteration in Arenaeus cribrarius (Lamarck) (Crustacea, Portunidae): an indicator of sexual maturity

Some individuals of the species Arenaeus cribrarius (Lamarck, 1818) bear a characteristic pink abdomen, which is notably different from the usual white coloration. The incidence of this chromatic alteration was determined for a single population and its relation with other individual variables were examined. The individuals were monthly collected from May, 1991 to April, 1993, in Ubatuba, São Paulo, with the aid of a shrimp fishery boat provided with double-rig trawling nets. All specimens were sexed, measured (CW = carapace width), distributed in 10-mm size classes and classified according to growth phase (juvenile and adult), molting condition and development stage of gonads. The occurrence of pink-colored morphs was also recorded. From a total of 2,096 collected individuals, only 60 females (nine of those ovigerous) presented a pink-colored abdomen, which represents 2.9% of the whole sample and 5.2% of the females. Almost all of them were intermolt individuals (96.6%) and 63.3% showed mature gonads. According to published data, size at the onset of functional maturity in A. cribrarius females is around 60 mm CW, from which the incidence of pink morphs and ovigerous crabs were recorded. The obtained results suggest that such a chromatic alteration is associated to sexual maturity in these females. This characteristic may enhance the attraction potential for mating, shortly after the puberty molt.