spleen-derived EPCs.

<p>EPCs showed endothelium-like cobblestone morphology with characteristic formation of clusters (A). Blue particles are clearly visible in almost every labeled cell with Prussian blue staining (B). (Magnification ×200).</p

Vessel wall area (mm²) of LCCA measured on T₂WI at different time points.

<p>There was no significant difference of vessel wall area among the three groups 1 day and 5 days after artery injury. However, vessel wall area of labeled EPC transfusion group was significantly less than that of unlabeled EPC transfusion group and control group at 15 days after artery injury. Vessel wall areas of EPCs transfusion group were significantly less than that of non-EPC transfusion group at 15 days after artery injury.</p

Histopathological analysis.

<p>Prussian blue staining showed blue particles of Fe₂O₃-PLL labeled EPCs distributing in subendothelium (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0020790#pone-0020790-g007" target="_blank">Figure 7A, 7B</a> indicated 5, 10 days after endothelium injury respectively). <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0020790#pone-0020790-g007" target="_blank">Figure 7C</a> showed crescentic neointima of injured artery in 2 animals of non-EPC transfusion group. (Magnification ×200).</p

Endothelial cell characteristics.

<p>After 7 days culture (A), cells taken up DiI-ac-LDL were red fluorescence (B), bound to FITC-UEA-I displayed green fluorescence (C), and the double-stained cells showed yellow fluorescence in cytoplasm (D). (Magnification ×200).</p

Identification of Lattice Oxygen in Few-Layer Black Phosphorous Exfoliated in Ultrahigh Vacuum and Largely Improved Ambipolar Field-Effect Mobilities by Hydrogenation and Phosphorization

Black phosphorus (BP) has recently attracted considerable attention due to its unique structure and fascinating optical and electronic properties as well as possible applications in photothermal agents. However, its main drawback is rapid degradation in ambient environments of H₂O and O₂, which has led to much research on the improvement of its stability. Unfortunately, this research has not shown great improvement in carrier mobilities. Here, we perform scanning tunneling microscopy observations of few-layer BP (FLBP) sheets exfoliated in ultrahigh vacuum and reveal, for the first time, the existence of lattice oxygen introduced during crystal growth. As a proof-of-concept application, hydrogenation is conducted to remove the lattice oxygen atoms followed by phosphorization, which repairs the phosphorous vacancies caused by mechanical exfoliation and hydrogenation. The resulting FLBP sheets show high ambipolar field-effect mobilities of 1374 cm² V^–1 s^–1 for holes and 607 cm² V^–1 s^–1 for electrons at 2 K. After storage in air for 3 days, the hole and electron mobilities only decrease to 1181 and 518 cm² V^–1 s^–1, respectively, and no structural degradation is observed. This work suggests an effective means to improve both the mobility and stability of BP sheets rendering practical application of FLBP sheets possible