Modification of thermal and electrical characteristics of hybrid polymer nanocomposites through gamma irradiation for advanced applications

In this article, we present a straightforward in-situ approach for producing Ag NPs incorporated in graphene oxide (GO) blended with glutaraldehyde (GA) cross-linked polyvinyl alcohol (PVA) matrix. Samples are γ-irradiated by doses of 2, 5, and 10 kGy and in comparison with the pristine films, the thermal conductivity ('k') and effusivity are measured. 'k' decreases with irradiation doses up to 5 kGy and further increase in the dosage results increase in 'k'. We performed FDTD modeling to verify the effect of polarization and periodicity on the absorptivity and emissivity spectra that are correlated to the 'k' and effusivity, empirically. Hence, we can confess that the structural properties of the prepared hybrid nanocomposite are manipulated by γ-irradiation. This attests that the PVA/GO-Ag/GA nanocomposite is radiation-sensitive and could be employed for thermal management systems. Moreover, their strong electrical insulation, as the measured dc conductivity of the γ-irradiated samples is found to be in the range of 2.66 × 10-8-4.319 × 10-7 Sm-1, which is below the percolation threshold of 1.0 × 10-6 Sm-1, demonstrates that they are excellent candidates for the use of thermal management materials. The low 'k' values allow us to use this promising material as thermal insulating substrates in microsensors and microsystems. They are also great choices for usage as wire and cable insulation in nuclear reactors due to their superior electrical insulation.

Levels of satisfaction with rheumatoid arthritis treatment and associated alignment between physicians and patients across Latin America

INTRODUCTION

Discordance (misalignment) regarding treatment satisfaction may exist in real-life clinical practice between patients and their physicians. We aimed to assess physician and patient treatment satisfaction levels and associated degree of misalignment in rheumatoid arthritis (RA).

METHOD

A point-in-time, multinational survey of patients and physicians was conducted in Latin America from December 2014 to October 2015. Physician- and patient-reported satisfaction levels with current RA treatment, alignment levels in satisfaction perception, and factors associated with satisfaction misalignment were assessed through bivariate and logistic regression analyses.

RESULTS

Participating physicians (N = 114) completed 555 patient record forms (PRFs); 372 patients completed self-complete questionnaires (PSC). A total of 346 physician-patient pairs were analyzed. Physicians reported satisfaction with current disease control in 270/346 (78.0%) PRFs; patients reported such satisfaction in 286/346 (82.7%) PSCs. Physician-patient alignment was observed in 78.6% of pairs. Compared with aligned patients, misaligned patients were younger, more likely to have moderate or severe disease (physician subjectively defined), deteriorating or unstable disease (physician subjectively defined), been exposed to a greater number of advanced therapy lines (biologic or Janus kinase inhibitor), greater current pain, a current acute episode, poorer health, and greater disability and impairment. Misaligned patients were less likely to be in remission. Logistic regression analysis revealed that misaligned patients were more likely to experience greater activity impairment.

CONCLUSIONS

High treatment satisfaction and alignment were observed among RA patients and their physicians in Latin America. Misaligned patients were more likely to report more severe disease and were less likely to be in remission. Addressing misalignment may lead to improved RA disease control.Key Points• High treatment satisfaction was observed among RA patients and their treating physicians in Latin America.• One-fifth of physician-patient pairs were misaligned in treatment satisfaction.• Patients misaligned with their physicians reported higher disease activity, lower quality of life, and greater disability than those who were aligned with their physicians.• Understanding and addressing misalignment in treatment satisfaction may improve outcomes in this patient population.

[Hereditary angioedema: a case series and bibliographic update]

BACKGROUND

Hereditary angioedema is an autosomal dominant inherited condition that is characterized by the local development of edema of the skin, subcutaneous tissue, and the walls of almost any organ, including the gastrointestinal and upper respiratory tracts.

OBJECTIVE

To describe the clinical characteristics, diagnosis and treatment of six controlled patients with hereditary angioedema.

PATIENTS AND METHODS

This paper presents clinical characteristics of six patients, four of them members of the same family, and two, isolated, non-family related cases. This contribution is a review of the latest literature related to diagnosis and treatment of hereditary angioedema.

RESULTS

Hereditary angioedema is a rare clinical entity that has a complicated manifestation profile that requires to discard a wide series of differential diagnosis. Deeper knowledge of its genetics and physiopathology will allow us to explore new treatment alternatives in addition to those already available.

CONCLUSIONS

By diffusion of isolated cases or familial cases series, as presented in this paper, the disease recognition and timely treatment will be reached.