Pluronic® F127 Hydrogel Containing Silver Nanoparticles in Skin Burn Regeneration: An Experimental Approach from Fundamental to Translational Research

Presently, skin burns are considered one of the main public health problems and lack therapeutic options. In recent years, silver nanoparticles (AgNPs) have been widely studied, playing an increasingly important role in wound healing due to their antibacterial activity. This work is focused on the production and characterization of AgNPs loaded in a Pluronic® F127 hydrogel, as well as assessing its antimicrobial and wound-healing potential. Pluronic® F127 has been extensively explored for therapeutic applications mainly due to its appealing properties. The developed AgNPs had an average size of 48.04 ± 14.87 nm (when prepared by method C) and a negative surface charge. Macroscopically, the AgNPs solution presented a translucent yellow coloration with a characteristic absorption peak at 407 nm. Microscopically, the AgNPs presented a multiform morphology with small sizes (~50 nm). Skin permeation studies revealed that no AgNPs permeated the skin after 24 h. AgNPs further demonstrated antimicrobial activity against different bacterial species predominant in burns. A chemical burn model was developed to perform preliminary in vivo assays and the results showed that the performance of the developed AgNPs loaded in hydrogel, with smaller silver dose, was comparable with a commercial silver cream using higher doses. In conclusion, hydrogel-loaded AgNPs is potentially an important resource in the treatment of skin burns due to their proven efficacy by topical administration.

New perspectives for physiotherapy education concerning assistive technology solutions as valid options to enhance functioning and quality of life

Introduction Recognizing that AT service characteristics, including knowledge and reasoning of providers, play a potential role in the appropriated selection and training, with impact on the psychosocial domains of QoL. In Portugal, AT services are detected to be ineffective concerning evaluation, recommendation, advocacy, training and outcome measuring, what could be a reason for these findings.

Objectives To investigate the relationship between AT services characteristics and psychosocial impact of the wheelchairs on users QoL to get insights to new approach models in physiotherapy.

Methodology Procedures included answering to self-administered questionnaires at their own. The dependent variable was the psychosocial impact of assistive devices (PIADS) and the independent variables were satisfaction with AT (QUEST) and AT service characteristics.

Results Participants were 184 wheelchair users for more than one year with diverse diagnosis; age M = 37.3 years, recruited at physiotherapy/rehabilitation settings in Portugal. Wheelchair users are more satisfied with devices than with AT services. Correlations between psychosocial impact of wheelchair are moderate regarding the satisfaction of device dimension, measured by QUEST. No corrections were found to satisfaction with service dimension Manual wheelchair users scored lower psychosocial impact than motorized wheelchair users and that difference was statistically significant.

Conclusion PT should be aware of the newest high technology devices introduced on the market, payment sources and state AT programs as well as destigmatize dependence associated to AT. We got significant insights to AT field and to the development of PT curriculum; PT students need more than the basic level of knowledge and training they achieved at school to feel prepared to provide AT services. After graduation, PTs need continuing education on AT. Strategies are discussed on this report.

The chlorobenzoate dioxygenase genes of Burkholderia sp. strain NK8 involved in the catabolism of chlorobenzoates

Burkholderia sp. NK8 grows abundantly on 3-chlorobenzoate (3CB),4-chlorobenzoate (4CB) and benzoate. The genes encoding the oxidation of (chloro)benzoates (cbeABCD) and catechol (catA, catBC), the LysR-type regulatory gene cbeR and the gene cbeE with unknown function, all of which form a single cluster in NK8, were cloned and analysed. The protein sequence of chlorobenzoate 1,2-dioxygenase (CbeABC) is 50-65% identical to the benzoate dioxygenase (BenABC) of Acinetobacter sp. ADP1, toluate dioxygenase (XylXYZ) of the TOL plasmid pWW0 and 2-halobenzoate dioxygenase (CbdABC) of Burkholderia cepacia 2CBS. Disruption of the cbeA gene resulted in the simultaneous loss of the ability to grow on benzoate and monochlorobenzoates, indicating the involvement of the cbeABCD genes in the degradation of these aromatics. The cbeABCD genes are preceded by catA, the gene for catechol dioxygenase. lacZ transcriptional fusion studies in Pseudomonas putida showed that catA and cbeA are co-expressed under the positive control of cbeR, a LysR-type transcriptional regulatory gene. The cbeA::lacZ transcriptional fusion studies showed that the inducers of the genes are 3CB, 4CB, benzoate and probably cis,cis-muconate. On the other hand, 2-chlorobenzoate (2CB) did not activate the expression of the genes. The chlorobenzoate dioxygenase was able to transform 2CB, 3CB, 4CB and benzoate at considerable rates. 2CB yielded both catechol and 3-chlorocatechol (3CC), and 3CB gave rise to 4-chlorocatechol and 3CC as the major and minor intermediate products, respectively, indicating that the NK8 dioxygenase lacks absolute regiospecificity. The absence of growth of NK8 on 2CB, despite its considerable degradation activity against 2CB, is apparently due to the inability of CbeR to recognize 2CB as an inducer of the expression of the cbe genes.

The acetylator phenotypes of Saudi Arabian diabetics

There is a significant association between the rapid acetylator phenotype and diabetes in European populations. Diabetes is a common problem in Saudi Arabians with some clinical features differentiating it from the disorder in Europeans. A series of 100 Saudi diabetics and 100 Saudi controls has been acetylator phenotyped. The controls showed 33 rapid acetylators (R) and 67 slow acetylators (S), a result closely similar to that previously published for the Saudi population. Overall the diabetics showed 27 R and 73 S which is not significantly different from the controls. The type I diabetics, however, showed two R and 22 S which is not only significantly different from the controls and the type II diabetics, but also the reverse of the association found in European populations.