不同陈化烟叶叶面高温微生物多样性

以国内外不同品种、不同陈化时间的10个烟叶样品为材料,对其叶面高温微生物进行了分离纯化、鉴定和多样性研究,以了解表面高温微生物在烟叶陈化发酵中的作用.结果表明:陈化烟叶表面高温菌总量为103~105个/g,高温细菌占绝对优势,真菌很少,未能分离到放线菌和酵母菌;高温细菌主要包括芽孢杆菌属(Bacillus)和地芽孢杆菌属(Geobacillus)两个属,芽孢杆菌属为优势菌属;高温霉菌主要包括青霉属(Penicillium)和曲霉属(Aspergillus),曲霉属为优势菌属.国内外烟叶表面微生物种类和数量有所差异,与陈化时间和烟叶品种等因素有着密切关系.     

A comparison of dust impacts on polycrystalline and monocrystalline solar photovoltaic performance: an outdoor experimental study

Environmental Science and Pollution Research - Solar cells are considered one of the most important and widespread solar applications in the world. However, the performance of the PV modules is...     

Leaching of rare earths from Abu Tartur (Egypt) phosphate rock with phosphoric acid

The leaching of rare earth elements (REEs) from Egyptian Abu Tartur phosphate rock using phosphoric acid has been examined and was subsequently optimized to better understand if such an approach could be industrially feasible. Preliminary experiments were performed to properly define the design of experiments. Afterward, 2⁴ full factorial design was implemented to optimize the leaching process. Optimum REEs leaching efficiency (96.7 ± 0.9%) was reached with the following conditions: phosphoric acid concentration of 30 wt.-% P₂O₅, liquid/solid ratio, mL/g, of 5:1, at 20 °C, and 120 min of leaching time. The apparent activation energy of the dissolution of REEs from phosphate rock using the phosphoric acid solution was -19.6 kJ/mol. D2EHPA was subsequently applied as an organic solvent for REEs separation from the acquired leach liquor. REEs stripping and precipitation were conducted, and finally, rare earth oxides with a purity of 88.4% were obtained. The leach liquor was further treated with concentrated sulfuric acid to recover the used phosphoric acid and produce gypsum with a purity of >95% at the same time. A flow diagram for this innovative cleaner production process was developed, and larger-scale experiments are proposed to further understand this promising approach to comprehensive phosphate rock processing.

     

河套平原O3浓度时空分布、传输路径及潜在源贡献分析

基于2005—2020年OMI遥感卫星O₃柱浓度数据，结合河套平原23个国控点环境自动监测站大气污染物数据和全球资料同化系统（GDAS）气象资料，探讨河套平原O₃污染时空分布特征、气象因素、传输路径和潜在来源.结果表明：（1）2005—2020年河套平原O₃柱浓度年均值波动上升，年均增长率为2.95%，季节变化表现为春季>冬季>夏季>秋季；（2）空间分布方面：高值区主要分布在东北部地区，南部城市低于北部城市；（3）河套平原地区O₃浓度与气温、日照呈显著正相关，与气压呈显著负相关，而降水、相对湿度、风速对O₃浓度影响具有显著的区域性差异；（4）基于后向轨迹HYSPLIT模型对河套平原地区污染严重城市鄂尔多斯市进行分析，发现远距离气流传输主要来自西北方向，近距离气流传输主要来自西南方向；O₃主要潜在贡献源区存在一定的季节差异：春季主要来自陕西北部与包头市，夏季主要来自陕西北部与山西西部，秋季主要来自内蒙古西部与宁夏银川市、陕西北部，而冬季则主...     

Correction to: Effect of gervital in attenuating hepatotoxicity caused by methotrexate or azathioprine in adult albino rats

Environmental Science and Pollution Research -