A facile and eco-friendly biosynthetic route for preparing Pd truncated octahedrons (PdTOs) using firmiana simplex leaf extract was reported without any chemical reducing agents. The information of reducing components...
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A facile and eco-friendly biosynthetic route for preparing Pd truncated octahedrons (PdTOs) using firmiana simplex leaf extract was reported without any chemical reducing agents. The information of reducing components, reduction process and time were obtained by ATR-FTIR imaging, FTIR and UV-Vis spectroscopy, respectively. TEM image revealed that more than 75% of PdNPs were composed of PdTOs with an average diameter of 9.2 nm. HR-TEM analysis demonstrated that a single PdTO consisted of the mix of {100} and {111} crystal planes. SAED and XRD pattern confirmed the well crystalline nature of fcc structured PdTOs. The model reactions of electro-oxidation of methanol and reduction of p-nitrophenol (p-NP) were adopted to explore the effects of structure and size of PdNPs on the catalytic properties. In the electro-oxidation of methanol, the forward-scan peak current density (If) of PdTOs was 10.05 mA cm-2, 6.3 times and 1.9 times of PdNPs-0 and PdNPs-4:1, illustrating its superior electro-catalytic property to that of spherical PdNPs. In the p-NP reduction reaction, the apparent rate constant (Ka) over PdTOs was 0.358 min-1, higher than spherical PdNPs-0 (0.08 min-1) with the similar particle size and lower than the same spherical PdNPs-4:1 (0.562 min-1) and commercial Pd/C (0.415 min-1), which all about half the size of PdTOs. It has been demonstrated that electro-chemical oxidation of methanol was a structure-sensitive reaction, while the reduction of p-NP was mainly dependent on the particle size of PdNPs.
目的探讨鼻中隔偏曲(NSD)对患者中鼻甲(MT)位置的影响及其对鼻中隔成形术的临床意义。方法对2018年2月—2019年12月因NSD行鼻中隔成形术联合MT手术的100例患者的鼻窦CT进行回顾性分析。利用GE医疗图像系统(Centricity Enterprise Web 3...
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目的探讨鼻中隔偏曲(NSD)对患者中鼻甲(MT)位置的影响及其对鼻中隔成形术的临床意义。方法对2018年2月—2019年12月因NSD行鼻中隔成形术联合MT手术的100例患者的鼻窦CT进行回顾性分析。利用GE医疗图像系统(Centricity Enterprise Web 3)测量NSD的偏曲程度和鼻腔凹、凸侧MT的结构指标,分析MT结构指标与NSD的偏曲程度之间的关系。结果鼻腔凸侧MT宽度(4.56±1.55)mm显著小于凹侧(7.01±1.75)mm(P<0.01),凸侧MT内侧缘距离中线的距离(5.04±1.37)mm显著大于凹侧(1.48±1.50)mm(P<0.01)。MT宽度与NSD的偏曲程度在凹侧呈正相关(r=0.245;P<0.05),在凸侧呈负相关(r=-0.420;P<0.01)。MT到中线的距离与NSD的偏曲程度在凹侧呈负相关(r=-0.430;P<0.01),在凸侧呈正相关(r=0.549;P<0.01)。结论NSD患者凹侧MT代偿性肥大并向中线移位,凸侧MT适应性缩小并远离中线。在鼻中隔成形术中,对包括泡状中鼻甲(CB)在内的肥大MT有必要给予更多关注。
Background and aims The crude extract of the endophyte Paecilomyces variotii known as ZhiNengCong (ZNC) has function of promoting plant growth and enhancing disease resistance and is widely used in China. Our study ai...
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Background and aims The crude extract of the endophyte Paecilomyces variotii known as ZhiNengCong (ZNC) has function of promoting plant growth and enhancing disease resistance and is widely used in China. Our study aims to evaluate the molecular mechanisms of plant growth promotion and disease protection. Methods We generated transcriptome profiles from ZNC-treated seedlings using RNA sequencing. The function of salicylic acid (SA) in ZNC-mediated immunity was examined using SA biosynthesis and signaling pathway mutants. The concentrations of nitrogen (N) and phosphorus (P) in seedlings under ZNC treatment were measured. The effect of ZNC on the level of the hormone auxin in roots was tested using transgenic plants containing DR5::GFP. Results ZNC exhibited ultrahigh activity in promoting plant growth and enhancing disease resistance, even at concentrations as low as 1-10 ng/ml. ZNC induced ROS accumulation, callose deposition, and expression of PR genes. SA biosynthesis and signaling pathways were required for the ZNC-mediated defense response. Moreover, in improving plant growth, ZNC increased the level of auxin in root tips and regulated the absorption of N and P. Conclusion According to these results, ZNC is a highly effective plant elicitor that promotes plant growth by inducing auxin accumulation at the root tip at low concentrations and enhances plant disease resistance by activating the SA signaling pathway at high concentrations.
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