豫西北地区苹果树生长期叶片黄色异变原因浅析

作者根据多年生产经验,长期深入生产第一线,对苹果树生长期叶片黄色异变进行了调查研究,本文对其进行了总结。笔者从4方面简要描述了苹果树生长期叶片黄色异变的发生原因,包括营养缺乏引起的黄叶、病虫危害引起的黄叶、苹果树生存环境不良引起的黄叶、树体管理失当引起的黄叶,并对其分别进行了简要分析。

豫西北地区苹果树生长期叶片黄色异变障碍矫正技术

针对豫西北地区苹果树生长期叶片黄色异变障碍提出了,从强化树体营养供应、科学防治病虫危害、优化树体生存环境、强化果园树体管理等4个方面入手,详细介绍了苹果树生长期叶片花色异变的预防和矫正技术。

Antibacterial activity of nanostructured Ti-45S5 bioglass-Ag composite against Streptococcus mutans and Staphylococcus aureus

Mechanical alloying and annealing at 1150 °C for 2 h under an argon atmosphere were used to prepare Ti-45S5 bioglass nanocomposites. Ti-45S5 bioglass material was chemically modified by silver. The antibacterial activity of Ti-10% 45S5 bioglass nanocomposite containing silver against Streptococcus mutans and Staphylococcus aureus was studied. Nanocomposites were characterized by X-ray diffraction, scanning electron microscopy equipped with an electron energy dispersive spectrometer and transmission electron microscopy to evaluate phase composition, crystal structure and grain size. In vitro bacterial adhesion study indicated a significantly reduced number of Streptococcus mutans and Staphylococcus aureus on the bulk nanostructured Ti-45S5 bioglass-Ag plate surface in comparison to that on microcrystalline Ti plate surface. Nanostructured Ti-based biomaterials can be considered to be the future generation of dental implants.