Stability study of ceftazidime was realized in order to investigate kinetics of degradation of this drug both in powder for injection and reconstituted sample. Ceftazidime was submitted to conditions of accelerated thermal degradation and photodegradation. Analyses of the degraded samples were performed by microbiological assay and decomposition reactions could be described by zero-order and se...

Targeting photosensitizers to cancer cells by conjugating them with specific antibodies, able to recognize and bind to tumor-associated antigens, is today one of the most attractive strategies in photodynamic therapy (PDT). This comprehensive review updates on chemical routes available for the preparation of photo-immunoconjugates (PICs), which show dual chemical and biological functionalities:...

Stabilization against thermal and photo-induced brightness reversion of high-brightness BCTMP (bleached chemithermomechanical pulp) by various sulfur compounds was investigated. Ethylene glycol bisthioglycolate and 3mercapto-1,2-propanediol were the most effective additives that provided bleaching action and prevented thermal and light-induced brighmess reversion. The stabilizing activity of th...

In the infrared spectrum, two contributions to shadows exist: one part is reflective shadows resulting from occlusion of instantly reflected infrared rays, and the other part is thermal (IR) shadows occurring through occlusion of irradiance in the past. The realization of thermal shadows requires a thermal balance calculation in four-dimensions (three-dimensional geometry in one-dimensional tim...

Spin-crossover crystals show multi-step responses to femtosecond light excitation. The local molecular photo-switching from low to high spin states occurs on sub-picosecond timescale. It is followed by additional conversion due to elastic (ns) and thermal (μs) effects. In [Fe(phen)2(NCS)2] crystals discussed herein, the thermal switching can be made unobtrusive for the investigation of cooperat...

Two routes to the thermal decomposition of poly(propylene carbonate) (PPC) have been consideredpolymer chain-end unzipping and random chain scission. The inhibition and catalysis of each mechanism has been studied. End-capping of low molecular weight (2 kDa) PPC has been achieved and confirmed with NMR analysis resulting in stabilization from unzipping. Citric acid was used as an additive and s...

This paper presents the dynamic simulation model to characterize water pumping and heating installation using PV/Thermal panel (PV/T) is developed. The model consists of a set of mathematical equations governing the main components of the system; namely: transparent cover, solar cell, absorber plate and operating fluid. The model is based on the analysis of the energy balance which includes the...

In this paper we report the use of photothermal techniques such as Thermal lens (TL) spectrometry, Photoacoustic and heat capacity, rcp, to determine the thermo-optical parameters, such as thermal conductivity (K), thermal diffusivity (D), specific heat (cp) and the optical path dependence with temperature (ds/dT), of an undoped polycrystalline 3C-SiC. To our knowledge, this is the first time t...

BACKGROUND Acne vulgaris is the most common disease of the skin affecting adolescents and young adults causing psychological distress. The combination of antibiotic resistance, adverse effects of topical and systemic anti acne medications and desire for high tech approaches have all led to new enthusiasm for light based acne treatment. Intense pulse light (IPL) therapy has three modes of action...