Innovative process for obtaining modified nanocellulose from soybean straw

In the present research, soybean straw was used to prepare nanocellulose (NC) via a ball mill, in different milling times (6, 9, and 12 h) and in-situ modified with an anionic surfactant. NCs were characterized for their chemical structure, surface composition, dimension and stability, morphology, crystalline structure, and thermal stability. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy results indicated a cellulosic structure for NCs and a physical interaction due to the electronic attractions between nanocellulose hydroxyls and surfactant end chain groups. The dynamic light scattering, Zeta potential, and transmission electron microscopy indicated that the in situ modified samples showed smaller sizes and good electrostatic stability. Besides, while ball mill resulted in nanofibers, the in situ modified-NC showed a nanocrystal shape, indicating that the surfactant alters the milling process and cellulose scale reduction. The modified-NC showed lower crystallinity and crystal size than unmodified nanocelluloses due to the surfactant chains' addition and influence during the milling process. The modified-NC showed slightly superior thermal stability. The NC-12S showed smaller particle sizes, high electrostatic, and thermal stability and indicated that 12 h is adequate to prepare modified nanocellulose via in situ modification. The prepared samples could be potentially used as coatings, emulsifiers, and nanocomposites reinforcing agents.

The experiences of maternity in front of hospitalization in high risk pregnances

Introduction

The pregnancy-puerperal cycle is defined as a moment that involves physical, psychological and social changes. There are pregnancies that require specialized care and attention due to the presence of risk factors that may be prior to pregnancy and / or that may be associated with the pregnancy condition itself, which characterize them as high-risk pregnancies. Currently, prenatal care with risk stratification is the main care strategy for pregnant women, once the risk classification is identified, it is possible to promote interventions according to the health needs of each pregnant woman. For this, the risk assessment is carried out at each prenatal consultation, so that, depending on the course of pregnancy, hospitalization becomes necessary. The diagnosis of high-risk pregnancies accompanied by hospitalization has impacts on the woman's life, such as loss of autonomy, a sense of failure and the incidence of greater care and interventions by the health team and the family that can configure practices to control their bodies.

Objective

This work aims to identify the hospitalization process during high-risk pregnancy as a space for the production of projects, resistance and protagonism through the protocols and regulations that configure the hospital context.

Methodology

This is an exploratory analysis of a qualitative approach in public health. A reference maternity hospital in high-risk pregnancy located in a teaching hospital in Greater Vitória was chosen. It will be used to define sampling for convenience. The data will be collected through semi-structured interviews and on-site observations by the researcher. The data analysis methodology used will be content analysis.

Expected Results

It is expected to understand the various practices of protagonism and resistance that permeate the care of hospitalized pregnant women.

Key messages

This work has an impact on the improvement of the maternal and child care network of the public health system in Brazil. This work allows to evaluate the quality of the assistance provided in the public maternity.

CD57+ cells in radicular cyst

AIM

As CD57 antigen is an important modulator of the immune system, the purpose of the present study was to compare the expression of this antigen on radicular cysts (RC) with hyperplastic or atrophic epithelium.

METHODOLOGY

Twenty cases of RC were retrieved and classified as atrophic or hyperplastic. A biotin-streptavidin amplified system was used for identification of the CD57 receptor.

RESULTS

The results demonstrated a greater percentage of CD57+ cells in RC with atrophic epithelium compared to hyperplastic epithelium.

CONCLUSION

As the expression of CD57 is indicative of immunosuppression, it may constitute a negative immunomodulator of RC's epithelium growth. Further studies are necessary to understand the importance of this cell to the biological activity or inactivity of RC's epithelium development.