Signature of coexistence of superconductivity and ferromagnetism in two-dimensional NbSe\u3csub\u3e2\u3c/sub\u3e triggered by surface molecular adsorption

Ferromagnetism is usually deemed incompatible with superconductivity. Consequently, the coexistence of superconductivity and ferromagnetism is usually observed only in elegantly designed multi-ingredient structures in which the two competing electronic states originate from separate structural components. Here we report the use of surface molecular adsorption to induce ferromagnetism in two-dimensional superconducting NbSe2, representing the freestanding case of the coexistence of superconductivity and ferromagnetism in one two-dimensional nanomaterial. Surface-structural modulation of the ultrathin superconducting NbSe2 by polar reductive hydrazine molecules triggers a slight elongation of the covalent Nb–Se bond, which weakens the covalent interaction and enhances the ionicity of the tetravalent Nb with unpaired electrons, yielding ferromagnetic ordering. The induced ferromagnetic momentum couples with conduction electrons generating unique correlated effects of intrinsic negative magnetoresistance and the Kondo effect. We anticipate that the surface molecular adsorption will be a powerful tool to regulate spin ordering in the two-dimensional paradigm

Amorphous Alloy: Promising Precursor to Form Nanoflowerpot

Nanoporous copper is fabricated by dealloying the amorphous Ti2Cu alloy in 0.03 M HF electrolyte. The pore and ligament sizes of the nanoporous copper can be readily tailored by controlling the dealloying time. The as-prepared nanoporous copper provides fine and uniform nanoflowerpots to grow highly dispersed Au nanoflowers. The blooming Au nanoflowers in the nanoporous copper flowerpots exhibit both high catalytic activity and stability towards the oxidation of glucose, indicating that the amorphous alloys are ideal precursors to form nanoflowerpot which can grow functional nanoflowers

Post-disaster Transitional Housing for Displaced People

Post-disaster displacement, with the increasing frequency and intensity of natural disasters, is quickly arising to become one of the most serious humanitarian challenges in the 21st century. As post-disaster housing spans several phases, the transitional housing phase is equally crucial as emergency sheltering and permanent housing: as dwellers remain in transitional housing projects up to years, their physical and emotional wellbeing is directly influenced by their surrounding built environment. Existing literature and practice have not paid enough attention to the built structures of post-disaster transitional housing. This thesis revisits past practices world-wide and architectural theory in the 20th century. Arguing that current transitional-housing design methodology is still deeply rooted in early 20th century Modernist ideologies, this thesis ties the missing link between architectural theory and humanitarian built environment design. Through examining theories and case studies, this thesis stresses the importance of approaching post-disaster transitional housing through the lens of architectural design, and makes suggestions for future improvements

Mesenchymal Stem Cell-Like Properties in Fibroblasts

Fibroblasts are biologically dynamic and morphologically heterogeneous and are the most abundant connective tissue cells, with diverse structures depending on their location and activity. The main function of fibroblasts is to maintain the structural integrity of connective tissues by continuously secreting precursors of the extracellular matrix. Recent advances in our knowledge on pathophysiologic features of fibroblasts revealed that in some situations epithelial cells can give rise to fibroblasts by epithelial-mesenchymal transition (EMT) and conversely, in some other situations, fibroblasts may give rise to epithelia by undergoing a mesenchymal to epithelial transition (MET). Given an opportunity to differentiate to other cells, fibroblasts may foster a novel clue for in situ tissue repair and contribute to cellular mechanisms of mesenchymal stem cell-like features under normal or pathological conditions. They have also been shown to suppress immune responses in vitro. Because of these properties, fibroblasts have recently received a very high profile in the literature. This review summarizes our understanding of the origins, mesenchymal stem cell-like characteristics and potency of directed differentiation of fibroblasts. In addition, we also present the evidence that mesenchymal stem cells and fibroblasts share much more in common than previously recognized

Multiple Directional Differentiation Difference of Neonatal Rat Fibroblasts from Six Organs

Background/Aims: Fibroblasts are abundantly distributed throughout connective tissues in the body and are very important in maintaining the structural and functional integrity. Recent reports have proved that fibroblasts and mesenchymal stem cells share much more in common than previously recognized. The aim of this study was to investigate comparative studies in fibroblasts on the differences in the expression of molecular markers and differentiation capacity from different organs. Methods: Combined trypsin/collagenase enzymes digestion method was used to isolate and culture the fibroblasts derived from heart, liver, spleen, lung, kidney and skin. Cell activity was determined by methyl thiazolyl tetrazolium (MTT) assay. Common molecular markers for fibroblasts such as vimentin, DDR2 and FSP1, stem cell markers nanog, c-kit and sca-1 were detected by RT-PCR, immunofluorescence and western blotting. The osteogenic, adipogenic and cardiogenic differentiations of fibroblasts were performed by inductive culture in special mediums, and analyzed by Alizarin red, Oil red O and immunofluorescence staining of cTnT respectively. Results: The proliferation rate of fibroblasts in lung was faster than in other five organs. Common molecular markers for fibroblasts were expressed differently in different organs. DDR2 was strongly expressed in fibroblasts in the heart, partly expressed in the heart, skin, liver and spleen. Interestingly, no expression of DDR2 was detected in liver and kidney. However, vimentin and FSP1 were consistently expressed in fibroblasts from skin, liver, kidney, spleen and lung. nanog expression in fibroblasts from lung was less than that from heart, skin, liver and spleen (P ). c-kit expression in fibroblasts from heart, skin and kidney was higher than that from spleen (P ), while the c-kit positive fibroblasts from liver was obviously higher than that from spleen (P ). But sca-1 expression in fibroblasts from lung was the lowest among six organs (P ). Directed differentiation in vitro had demonstrated that skin fibroblasts had the strongest multiple differentiation potential, and the next was cardiac fibroblasts. And fibroblasts in liver and kidney had the advantage in myocardial differentiation, while fibroblasts in spleen only had the advantage in osteogenic differentiation. Conclusions: There are obvious heterogeneity in molecular markers and muti-directional differentiation in fibroblasts from six organs