On topological structures of fuzzy parametrized soft sets

In this paper, we introduce the topological structure of fuzzy parametrized soft sets and fuzzy parametrized soft mappings. We define the notion of quasi-coincidence for fuzzy parametrized soft sets and investigated basic properties of it. We study the closure, interior, base, continuity and compactness and properties of these concepts in fuzzy parametrized soft topological space

Yunus Emre

Taha Toros Arşivi, Dosya No: 91/A-Yunus Emr

Sisli geceler

Halide Nusret'in Yeni Şark'ta tefrika edilen Sisli Geceler adlı romanıTelif hakları nedeniyle romanın tam metni verilememiştir

Cornea engineering on polyester carriers

In this study, biodegradable polyester based carriers were designed for tissue engineering of the epithelial and the stromal layers of the cornea, and the final construct was tested in vitro. In the construction of the epithelial layer, micropatterned films were prepared from blends of biodegradable and biocompatible polyesters of natural (PHBV) and synthetic (P(L/DL)LA) origin, and these films were seeded with D407 (retinal pigment epithelial) cells. To improve cell adhesion and growth, the films were coated with fibronectin. To serve as the stromal layer of the cornea, highly porous foams of P(L/DL)LA-PHBV blends were seeded with 3T3 fibroblasts. Cell numbers on the polyester carriers were significantly higher than those on the tissue culture polystyrene control. The cells and the carriers were characterized scanning electron micrographs showed that the foam was highly porous and the pores were interconnected. 3T3 Fibroblasts were distributed quite homogeneously at the seeding site, but probably because of the high thickness of the carrier (∼6 mm); they could not sufficiently populate the core (central parts of the foam) during the test duration. The D407 cells formed multilayers on the micropatterned polyester film. Immunohistochemical studies showed that the cells retained their phenotype during culturing; D407 cells formed tight junctions characteristic of epithelial cells, and 3T3 cells deposited collagen type I into the foams. On the basis of these results, we concluded that the micropatterned films and the foams made of P(L/DL)LA-PHBV blends have a serious potential as tissue engineering carriers for the reconstruction of the epithelial and stromal layers of the cornea. © 2006 Wiley Periodicals, Inc

The effect of CRP/albumin ratio on prognosis of hospitalized patients due to COVID-19

Introduction: COVID-19 disease caused by the SARS-Cov-2 virus is characterized by clinical spectra of varying severity. Coagulopathy and inflammation are the most important factors associated with COVID-19 severity. The use of a biomarker of inflammation and coagulation factors has not yet been clarified. The present study aimed to examine the role of CRP/Albumin, an inflammation marker, in predicting the course of COVID-19 disease.Methods: The Demographic, laboratory, and prognosis of 457 patients who were hospitalized during the COVID-19 pandemic service between April and May 2020 were analyzed retrospectively. The relationship between the patients' CRP/Albumin ratio and disease severity, length of hospital stays, and prognosis were analyzed.Results: The rate of hospitalization in the intensive care unit was 10.5% (n=48), mechanical ventilation was 8.1% (n=37), and death was 1.3% (n=6). The CRP/albumin ratio was statistically higher in those with lung infiltration (p=0.005), those who were taken to the intensive care unit (p lt;0.001), and those who needed mechanical ventilation (p lt;0.001). A positive significant correlation was found between the length of hospital stay and the CRP/albumin ratio(r=0.412, p lt; 0.001).Conclusion: The CRP/Albumin ratio is thought to be an auxiliary marker for doctors in the early transfer of patients to the intensive care unit, the early detection of those in need of MV, and the determination of lung infiltration.Keywords: COVID-19, CRP/albumin ratio, prognosi

Structural reinforcement of cell-laden hydrogels with microfabricated three dimensional scaffolds

Hydrogels commonly used in tissue engineering are mechanically soft and thus often display structural weakness. Herein, we introduce a strategy for enhancing the structural integrity and fracture toughness of cell-laden hydrogels by incorporating a three-dimensional (3D) microfabricated scaffold as a structural element. Digital micromirror device projection printing (DMD-PP) system, a rapid prototyping technology which employs a layer-by-layer stereolithographic approach, was utilized to efficiently fabricate 3D scaffolds made from photocrosslinkable poly(ethylene glycol) diacrylate (PEGDA). The scaffold was incorporated into a photocrosslinkable gelatin hydrogel by placing it in a pre-gel solution, and inducing in situ hydrogel formation. The resulting scaffold-reinforced hydrogels demonstrated a significant increase in ultimate stress and provided structural support for mechanically weak hydrogels. In addition, the scaffold did not affect the rigidity of hydrogels, as it was not involved in the crosslinking reaction to form the hydrogel. Therefore, the presented approach could avoid inadvertent and undesired changes in the hydrogel rigidity which is a known regulator of cellular activities. Furthermore, the biocompatibility of scaffold-reinforced hydrogels was confirmed by evaluating the viability and proliferation of encapsulated fibroblasts. Overall, the strategy of incorporating 3D scaffolds into hydrogels as structural reinforcements presented in this study will be highly useful for enhancing the mechanical toughness of hydrogels for various tissue engineering applications.open3

Three-Dimensional Graphene Nano-Networks with High Quality and Mass Production Capability via Precursor-Assisted Chemical Vapor Deposition

We report a novel approach to synthesize chemical vapor deposition-grown three-dimensional graphene nano-networks (3D-GNs) that can be mass produced with large-area coverage. Annealing of a PVA/iron precursor under a hydrogen environment, infiltrated into 3D-assembled-colloidal silicas reduces iron ions and generates few-layer graphene by precipitation of carbon on the iron surface. The 3D-GN can be grown on any electronic device-compatible substrate, such as Al2O3, Si, GaN, or Quartz. The conductivity and surface area of a 3D-GN are 52 S/cm and 1,025 m(2)/g, respectively, which are much better than the previously reported values. Furthermore, electrochemical double-layer capacitors based on the 3D-GN have superior supercapacitor performance with a specific capacitance of 245 F/g and 96.5% retention after 6,000 cycles due to the outstanding conductivity and large surface area. The excellent performance of the 3D-GN as an electrode for supercapacitors suggests the great potential of interconnected graphene networks in nano-electronic devices and energy-related materials.open15