Yaxin Pei, Zhengsheng Yu, Jing Ji, Aman Khan, Xiangkai Li
Abstract
The Yellow River is the most important water resource in northern China. In the recent past, heavy metal contamination has become severe due to industrial processes and other anthropogenic activities. In this study, riparian soil samples with varying levels of chromium (Cr) pollution severity were collected along the Gansu industrial reach of the Yellow River, including samples from uncontaminated sites (XC, XGU), slightly contaminated sites (LJX, XGD), and heavily contaminated sites (CG, XG). The Cr concentrations of these samples varied from 83.83 mg⋅kg-1(XGU) to 506.58 mg⋅kg-1(XG). The chromate [Cr (VI)] reducing ability in the soils collected in this study followed the sequence of the heavily contaminated > slightly contaminated > the un-contaminated. Common Cr remediation geneschrAandyieFwere detected in the XG and CG samples. qRT-PCR results showed that the expression ofchrAwas up-regulated four and threefold in XG and CG samples, respectively, whereas the expression ofyieFwas up-regulated 66- and 7-fold in the same samples after 30 min treatment with Cr (VI). The copy numbers ofchrAandyieFdidn't change after 35 days incubation with Cr (VI). The microbial communities in the Cr contaminated sampling sites were different from those in the uncontaminated samples. Especially, the relative abundances ofFirmicutesandBacteroideteswere higher whileActinobacteriawas lower in the contaminated group than uncontaminated group. Further, potential indicator species, related to Cr such as Cr-remediation genera (Geobacter, PSB-M-3, Flavobacterium, andMethanosarcina); the Cr-sensitive genera (Skermanella, Iamia, Arthrobacter, andCandidatus Nitrososphaera) were also identified. These data revealed that Cr shifted microbial composition and function. Further, Cr (VI) reducing ability could be related with the expression of Cr remediation genes.
This research output has an Altmetric Attention Score of 10. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 24 February 2018.
All research outputs
#3,221,611
of 23,023,224 outputs
Outputs from Frontiers in Microbiology
#3,004
of 25,143 outputs
Outputs of similar age
#76,110
of 441,133 outputs
Outputs of similar age from Frontiers in Microbiology
#92
of 545 outputs
Altmetric has tracked 23,023,224 research outputs across all sources so far. Compared to these this one has done well and is in the 85th percentile: it's in the top 25% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 25,143 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 6.3. This one has done well, scoring higher than 87% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 441,133 tracked outputs that were published within six weeks on either side of this one in any source. This one has done well, scoring higher than 82% of its contemporaries.
We're also able to compare this research output to 545 others from the same source and published within six weeks on either side of this one. This one has done well, scoring higher than 82% of its contemporaries.
