Correlation in between the soil's chemical properties and the production variables of teca
NATIVA
Authors: Basso, Sueza; Watzlawick, Luciano Farinha; Pott, Cristiano Andre; Lombardi, Katia Cylene; Homczinski, Isabel
Abstract
The research aimed to correlate soil chemical attributes with production variables in a Teca settlement implanted in a silvipastoral system. The present study was carried out in the municipality of Alta Floresta, State of Mato Grosso, in an area of Silvipastoril System (SSP). The study was carried out in an area of 118 ha with Teca seedlings of clonal origin. For characterization of the study area and subsequent selection of the sample units, a forest inventory was carried out by means of systematic sampling. The variables evaluated were: diameter at breast height (DBH), total height (h), trunk biomass (BsT), twigs (BsG), leaves (BsF) and radicular (BsR). The bases showed a positive correlation with DBH, h, while sodium (Na) and magnesium (Mg) presented a negative correlation with these variables. The BsR and BsT correlated positively with potential acidity and organic matter (OM) and negatively with Na and magnesium (Mg) (BsR and BsG only). Fertilization and soil nutrient correction are very important for the growth and development of teak, and the quantities of these nutrients at different depths interfere with their development.
A heparin-functionalized woven stent graft for endovascular exclusion
COLLOIDS AND SURFACES B-BIOINTERFACES
Authors: Liu, Zekun; Zheng, Zhaozhu; Chen, Kaili; Li, Yi; Wang, Xiaoqin; Li, Gang
Abstract
With the increase of vascular diseases in recent years, it is of importance to develop an anti-occlusion stent graft, which can meet the requirements of transplants for a long term. In this paper, we describe a silk fibroin (SF)/heparin-functionalized bifurcated stent graft (BSG) using textile forming technology. The BSGs were prototyped based on seamless weaving technology, and the surface was modified with SF-loaded heparin under steam/air treatment to improve their patency. The physical properties such as thickness, water permeability, contact angle, mechanical properties, and in vitro drug release and coagulation time of the BSGs were examined. The results showed that heparin modification can improve its coagulation time, and the water permeability resistance of the BSGs reached 1.154 +/- 0.854 mL/(cm(2) x min), while their thicknesses were just 0.085 +/- 0.004 mm. The heparin release of the BSGs showed that the release time was prolonged upon steam treatment by means of the increase in the beta-sheet structure and crystallinity of SF. The viability and attachment of human vascular smooth muscle (HVSM) cells cultured in the release of modified BSGs demonstrated that the modified BSGs could significantly inhibit the proliferation of HVSM cells. The heparin-functionalized BSG with satisfactory thickness, water permeability resistance and anti-occlusion function, which has potential applications in the treatment of vascular diseases.