Turning a native or corroded Mg alloy surface into an anti-corrosion coating in excited CO2

Despite their energy-efficient merits as promising light-weight structural materials, magnesium (Mg) based alloys suffer from inadequate corrosion resistance. One primary reason is that the native surface film on Mg formed in air mainly consists of Mg(OH)2 and MgO, which is porous and unprotective, especially in humid environments. Here, we demonstrate an environmentally benign method to grow a protective film on the surface of Mg/Mg alloy samples at room temperature, via a direct reaction of already-existing surface film with excited CO2. Moreover, for samples that have been corroded obviously on surface, the corrosion products can be converted directly to create a new protective surface. Mechanical tests show that compared with untreated samples, the protective layer can elevate the yield stress, suppress plastic instability and prolong compressive strains without peeling off from the metal surface. This environmentally friendly surface treatment method is promising to protect Mg alloys, including those already-corroded on the surface.China. Ministry of Science and Technology. National Key Research and Development Program (No. 2017YFB0702001)National Natural Science Foundation of China (51621063)National Natural Science Foundation of China (51601141)National Natural Science Foundation of China ( 51401239)Shaanxi Sheng (China). Science and Technology Department (2016KTZDGY-04-03)Shaanxi Sheng (China). Science and Technology Department (2016KTZDGY-04-04)China Postdoctoral Science Foundation (2016M600788)China University of Petroleum. Science Foundation (No. 2462018BJC005)China University of Petroleum. Science Foundation (C201603)National Science Foundation (U.S.) (ECCS-1610806

Changes in satellite-derived spring vegetation green-up date and its linkage to climate in China from 1982 to 2010: a multimethod analysis

International audienc

Stand ages regulate the response of soil respiration to temperature in a Larix principis-rupprechtii plantation

International audienc

Immunohistochemical Study of Expression of Sohlh1 and Sohlh2 in Normal Adult Human Tissues.

The expression pattern of Sohlh1 (spermatogenesis and oogenesis specific basic helix-loop-helix 1) and Sohlh2 in mice has been reported in previous studies. Sohlh1 and Sohlh2 are specifically expressed in spermatogonia, prespermatogonia in male mice and oocytes of primordial and primary follicles in female mice. In this report, we studied the expression pattern of Sohlh1 and Sohlh2 in human adult tissues. Immunohistochemical staining of Sohlh1 and Sohlh2 was performed in 5 samples of normal ovaries and testes, respectively. The results revealed that Sohlh genes are not only expressed in oocytes and spermatogonia, but also in granular cells, theca cells, Sertoli cells and Leydig cells, and in smooth muscles of blood vessel walls. To further investigate the expression of Sohlh genes in other adult human tissues, we collected representative normal adult tissues developed from three embryonic germ layers. Compared with the expression in mice, Sohlhs exhibited a much more extensive expression pattern in human tissues. Sohlhs were detected in testis, ovary and epithelia developed from embryonic endoderm, ectoderm and tissues developed from embryonic mesoderm. Sohlh signals were found in spermatogonia, Sertoli cells and also Leydig cells in testis, while in ovary, the expression was mainly in oocytes of primordial and primary follicles, granular cells and theca cells of secondary follicles. Compared with Sohlh2, the expression of Sohlh1 was stronger and more extensive. Our study explored the expression of Sohlh genes in human tissues and might provide insights for functional studies of Sohlh genes

Exceptional plasticity in the bulk single-crystalline van der Waals semiconductor InSe

Inorganic semiconductors are vital for a number of critical applications but are almost universally brittle. Here, we report the superplastic deformability of indium selenide (InSe). Bulk single-crystalline InSe can be compressed by orders of magnitude and morphed into a Mobius strip or a simple origami at room temperature. The exceptional plasticity of this two-dimensional van der Waals inorganic semiconductor is attributed to the interlayer gliding and cross-layer dislocation slip that are mediated by the long-range In-Se Coulomb interaction across the van der Waals gap and soft intralayer In-Se bonding. We propose a combinatory deformability indicator (Xi) to prescreen candidate bulk semiconductors for use in next-generation deformable or flexible electronics

Representative immunohistochemical staining of <i>Sohlh1</i> and <i>Sohlh2</i> in epithelia of respiratory and digestive system (A-H).

<p>A and B show <i>Sohlh1</i> and <i>Sohlh2</i> expressions in esophagus epithelia respectively. C and D show <i>Sohlh1</i> and <i>Sohlh</i>2 expressions in alveolar cells respectively. E and F show <i>Sohlh1</i> and <i>Sohlh</i>2 expressions in liver respectively. G and H show <i>Sohlh1</i> and <i>Sohlh</i>2 expressions in pancreas. Arrows show positive cells and arrows in different color indicate different cell types. Bars indicate 20μm.</p