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Preliminary study showed that among 40‐ to 100‐kPa O2 atmospheres, 60‐kPa O2 reduced the respiration of fresh‐cut ‘Carabao’ mango cubes the most when held at 5 °C or 13 °C for 42 h. Therefore, the effects of 60‐kPa O2 on the physiology and microbial quality of fresh‐cut ‘Carabao’ and ‘Nam Dokmai’ mango cubes were determined and compared with those held in air. The high‐O2 atmosphere reduced the respiration rate of ‘Carabao’ mango cubes stored at 5 °C but stimulated the rate after 2 d of storage at 13 °C. Browning of ‘Carabao’ cubes was accelerated by 60‐kPa O2 at 13 °C. With ‘Nam Dokmai’ cubes, the high O2 had no effect on respiration rate, browning, and incidence of water‐soaked appearance at 5 °C and 13 °C. The high O2 did not affect texture or ascorbic acid content of ‘Carabao’ and ‘Nam Dokmai’ mango cubes at either temperature. Counts of lactic acid bacteria and molds were below the detection level (2.4 log colony‐forming units [CFU]/g) during storage at both temperatures. However, 60‐kPa O2 stimulated the growth of mesophilic aerobic bacteria on ‘Carabao’ cubes and yeasts of ‘Nam Dokmai’ cubes at 13 °C. The increased microbial count may have been due to the higher pH of cubes stored in 60‐kPa O2 at 13 °C than at 5 °C or in air. Within ‘Nam Dokmai’ mango cubes, the predominant genera in mesophilic aerobic bacteria were Enterobacter, Klebsiella, and Pantoea and in the yeasts were Candida, Cryptococcus, and Rhodotorula. These results indicate that 60‐kPa O2 is not desirable for mango cubes when held at 13 °C. 相似文献
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Chengyan Wang Jiani Xie Xinghua Dong Linqiang Mei Maoru Zhao Zhengwei Leng Houxiang Hu Lele Li Zhanjun Gu Yuliang Zhao 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(16)
The exploration of an old drug for new biomedical applications has an absolute predominance in shortening the clinical conversion time of drugs for clinical application. In this work, carbon nanoparticles suspension injection (CNSI), the first clinically approved carbon nanoparticles in China, is explored as a new nano‐radioprotective agent for potent intestinal radioprotection. CNSI shows powerful radioprotective performance in the intestine under oral administration, including efficient free radical scavenging ability, good biosafety, high chemical stability, and relatively long retention time. For example, CNSI shows high reactive oxygen species (ROS) scavenging activities, which effectively alleviates the mitochondrial dysfunction and DNA double‐strand breaks to protect the cells against radiation‐induced damage. Most importantly, this efficient ROS scavenging ability greatly helps restrain the apoptosis of the small intestinal epithelial and crypt stem cells, which decreases the damage of the mechanical barrier and thus relieves radiation enteritis. Moreover, CNSI helps remove the free radicals in the intestinal microenvironment and thus maintain the balance of intestinal flora so as to mitigate the radiation enteritis. The finding suggests a new application of clinically approved carbon nanoparticles, which not only promotes the development of new intestinal radioprotector, but also has a great potential for clinical transformation. 相似文献
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中国鸭绿江口滨海湿地植物多样性分析 总被引:1,自引:1,他引:0
通过线路、样地调查法及聚类分析等研究方法,对鸭绿江口湿地的植物多样性进行分析。得出以下结论:该地区植物种类丰富多样,以被子植物、双子叶植物为主,优势科现象明显,单种属和少种属占据比率较高,表现出一定残遗性;区系分布类型多样,来源较广泛,具有一定古老性,但特有属、种匮乏;区系温带属性明显,热带成分也比较丰富,说明本区与热带植物区系亲缘关系较高,显示出过渡性,建议应加强植物多样性的保护与管理,减少干扰与破坏,为保护候鸟迁徙地和区域生态安全提供良好环境。 相似文献
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目的探讨水杨酸铬(Ⅲ)配合物{[Cr(Ⅲ)(5-Cl-SA)(en)2]Cl·2H2O·2CH3OH}对肥胖小鼠的减肥效果和对小鼠肠道菌群结构的影响。方法昆明种小鼠随机分为正常组、模型组和药物组,定期称重并收集其粪便;给药9周后,解剖小鼠并测定多项生理生化指标;提取粪便微生物总DNA,PCR扩增16S rDNA V3可变区,并行变性梯度凝胶电泳(DGGE),分析肠道微生物多样性,利用主成分分析(PCA)研究肠道微生物群落组成的变化。结果水杨酸铬(Ⅲ)配合物可显著控制小鼠体重增长,且有减肥功效;给药9周后,小鼠各项生理指标均趋于正常。PCR-DGGE指纹图谱分析结果显示,高脂饲料和受试药物对肠道微生物的多样性影响不大,但对菌群结构影响显著。结论本研究为开发新型减肥药物提供了依据。 相似文献