排序方式： 共有2条查询结果，搜索用时 46 毫秒
1
1.
Detection of sulfur-oxidizing bacteria has largely been dependent on targeted gene sequencing technology or traditional cell cultivation, which usually takes from days to months to carry out. This clearly does not meet the requirements of analysis for time-sensitive samples and/or complicated environmental samples. Since energy-dispersive X-ray spectrometry (EDS) can be used to simultaneously detect multiple elements in a sample, including sulfur, with minimal sample treatment, this technology was applied to detect sulfur-oxidizing bacteria using their high sulfur content within the cell. This article describes the application of scanning electron microscopy imaging coupled with EDS mapping for quick detection of sulfur oxidizers in contaminated environmental water samples, with minimal sample handling. Scanning electron microscopy imaging revealed the existence of dense granules within the bacterial cells, while EDS identified large amounts of sulfur within them. EDS mapping localized the sulfur to these granules. Subsequent 16S rRNA gene sequencing showed that the bacteria detected in our samples belonged to the genus Chromatium, which are sulfur oxidizers. Thus, EDS mapping made it possible to identify sulfur oxidizers in environmental samples based on localized sulfur within their cells, within a short time (within 24 h of sampling). This technique has wide ranging applications for detection of sulfur bacteria in environmental water samples. 相似文献
2.
以叉鞭金藻(Dicrateria inornata)为研究对象,分析了不同质量浓度四溴双酚A(TBBPA)污染下微藻光合色素含量、可溶性蛋白含量、超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量,以及细胞形态和细胞内部结构的变化。研究结果显示:在TBBPA较低质量浓度(0.5和2.0mg/L)污染条件下,叉鞭金藻的叶绿素a(Chl-a)、叶绿素c(Chl-c)和类胡萝卜素(Car)含量显著高于对照组,其含量第24小时达最大值;较高质量浓度(4.0和8.0mg/L)污染条件下,3种色素含量则显著低于对照组,其含量在第24小时达最小值。实验期间各实验组叉鞭金藻的可溶性蛋白含量、SOD活性和MDA含量主要被诱导;4.0mg/L的TBBPA作用叉鞭金藻96h后,藻细胞表面形态和内部亚显微结构均发生变化,与光合色素含量降低、MDA含量增加相一致。 相似文献
1