INVESTIGATION OF THE PHYSICAL PROPERTIES OF MELTBLOWN NONWOVENS FOR AIR FILTRATION

WOS: 000322802700008Textile filters are industrial textiles used in filtration applications. Among textile materials, especially nonwovens are suitable for filtration applications, because of their complex structures and appropriate thickness. Nonwoven filters are used in various application areas of technical textiles such as medtech, mobiltech, protech, packtech and hometech. Meltblown nonwovens are a unique class of materials, characterized by high surface are, porosity, softness and absorbency due to their microstructure. In this study polypropylene meltblown nonwovens were produced for the purpose of air filtration. Physical properties, namely thickness, basis weight, tensile properties, air permeability, and fibre diameter of were measured and effect of various production parameters on the physical properties of PP meltblown nonwovens were investigated and possibility for using such materials in air filtration was discussed

Acute renal failure after myeloablative allogeneic hematopoietic stem cell transplantation: incidence, risk factors, and relationship with the quantity of transplanted cells

Aim: Acute renal failure (ARF) after hematopoietic stem cell transplantation (HSCT) is a widespread complication leading to considerable morbidity and mortality. The present study aims to determine the incidence and risk factors of ARF and to investigate whether there exists a relationship between the renal injury indicators and quantity of the transplanted stem cells in a uniform patient population after allogeneic myeloablative HSCT. Methods: Patients undergoing myeloablative allogeneic HSCT from 2007 to 2008 were monitored prospectively in terms of their renal functions during the first 100 days after transplantation. ARF was defined as a twofold rise in serum creatinine concentration of baseline value or a >50% decrease in creatinine clearance and classified into three grades. Results: ARF occurred in 51.3% of patients over a period of 100 days after HSCT. ARF developed in 12 (60.0%) patients within the first 2 weeks, whereas in 8 (40.0%) of them ARF development was observed within 2-4 weeks. No correlation was found between ARF development and the quantity of the infused hematopoietic stem cells. Additionally, we were not able to identify a particular cause which was significantly associated with the occurrence of ARF after HSCT. Conclusion: A 51.3% incidence of ARF was found in patients after myeloablative allogeneic HSCT. ARF in HSCT patients could not be linked to a single cause. Rather a combination of multiple risk factors seems to be responsible for ARF development