Chromate-Reducing Profile of Bacterial Strains Isolated from Industrial Effluents

Rizvi, Fariha Zakria; Kanwal, Wajiha; Faisal, Muhammad

doi:10.15244/pjoes/61881

Cited by 10 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present studied area, the water source comes from the muddy beach area, which might be the reason for the increase or dominance of Exiguobacterium spp. that was proved as a potential candidate for use as a bioinoculant for the remediation of contaminated soils because this genus has been shown to tolerate the stress of heavy metals, such as cadmium, mercury, copper, zinc, arsenic and manganese (Rizvi et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

16S rRNA sequences of Exiguobacterium spp. bacteria dominant in a biofloc pond cultured with whiteleg shrimp, Penaeus vannamei

Manan

Rosland

Deris

et al. 2022

Aquaculture Research

View full text Add to dashboard Cite

Biofloc technology is being applied increasingly in shrimp aquaculture. Many countries have adopted this technology to increase shrimp aquaculture production. Owing to its major importance, this study was conducted to identify the bacterial population from biofloc aquaculture shrimp pond water of Singkir Laut, Kedah, Malaysia. Samples of mature biofloc were collected from the biofloc pond water at different shrimp ages (day of culture [DOC]): DOC30, DOC60 and DOC90. Overall, 43 sequences of bacterial species were blasted, which were identified as Exiguobacterium spp., Bacillus spp., Vibrio spp., Acinetobacter junii, Cobetia marina, Rheinheimera aquimaris and Pseudoalteromonas spp. These bacterial species were identified mostly from heterotrophic plate count agar. The bacterial species of Exiguobacterium aestuarii, Exiguobacterium profundum and Exiguobacterium aurantiacum were identified with 16S rRNA gene sequence similarities of 98.45–99.44%. Bacterial species of Bacillus pumilus, Bacillus velezensis, Bacillus cereus, Bacillus safensis and Bacillus subtilis were identified with 16S rRNA gene sequence similarities of 98.81–99.21%. Bacterial species of Vibrio diazotrophicus, Vibrio diabolicus, Vibrio natriegens and Vibrio harveyi were identified with 16S rRNA gene sequence similarities of 98.03–99.19%. Bacteria from Rheinheimera aquimaris were also identified with 16S rRNA gene sequence similarities of 98.69–99.26%; this bacterium is a novel bacterium identified from biofloc samples of the present study and has not been reported from biofloc samples in any previous study. Exiguobacterium spp. from the novel strains of E. aestuarii and E. profundum were identified as dominant, with 23 of 43 samples isolated from a shrimp pond at time points DOC30, DOC60 and DOC90; these bacteria are Gram‐variable rod‐shaped organisms that are capable of producing extracellular enzyme activity to break down chemical structures, thereby helping to remove organic compounds from aquaculture waste. Exiguobacterium spp. are usually identified in tidal flat sediments and on muddy sea coasts. This discovery is consistent with the site of the shrimp pond near to a muddy beach area, which might be the source of seawater leading to the predominance of this type of bacteria in the biofloc samples in the studied pond.

show abstract

Section: Discussionmentioning

confidence: 99%

16S rRNA sequences of Exiguobacterium spp. bacteria dominant in a biofloc pond cultured with whiteleg shrimp, Penaeus vannamei

Manan

Rosland

Deris

et al. 2022

Aquaculture Research

View full text Add to dashboard Cite

show abstract

“…So far, 20 species have been identified within this genus from diverse habitats, including marine water, permafrost to hot spring, food processing plants, and soil (see review by Pandey 2020). Various species of Exiguobacterium have been studied for industrial use, including enzyme production (Kasana and Pandey 2018), bioremediation of pesticide, and degradation of toxic compounds (Rizvi et al 2016;Mohapatra et al 2017), and some of them have the potential to promote plant growth (Chauhan et al 2015;Kumar and Verma 2018). The agroutility of Exiguobacterium has been confirmed by its ability to suppress the fungal diseases of cereal crops and to inhibit the growth and development of plant pathogens (Selvakumar et al 2009).…”

Section: Discussionmentioning

confidence: 99%

Isolation and identification of a pathogenic bacterium, Exiguobacterium oxidotolerans XP-2, from the abnormal diseased mature sporophytes of a commercially cultivated brown seaweed Saccharina japonica

Chen

Zhuang

Qiu³

et al. 2021

J Appl Phycol

View full text Add to dashboard Cite

Diseases of the commercially cultivated brown seaweed Saccharina japonica have been noticed since the 1960s in China. However, the usually opportunistic nature of the pathogenic bacteria of seaweeds is still a main obstacle for isolating and identifying pathogenic bacteria responsible for causing diseases of the cultivated S. japonica. In this study, a Gram-positive bacterium XP-2 was isolated from the abnormal diseased mature sporophytes of S. japonica. Pathogenicity test indicated that XP-2 could cause green-rotten disease in healthy juvenile sporophytes and significant algal ultrastructural changes were observed after S. japonica was infected by XP-2. The cells shrank, and the thylakoids of the chloroplasts became blurred after 12 h of re-infection. At 24 h slight deformation was observed in the structure of the mitochondria, chloroplasts, and nucleus. There also were many vacuoles in the infected cells. After 31 h of re-infection, mitochondrial structure and thylakoids became more indistinct. SEM and TEM observations indicated that XP-2 was rod-shaped with no flagella. Analysis of the full length 16S rRNA gene sequence and physiological and chemical characteristics indicated that XP-2 was closely related to Exiguobacterium oxidotolerans 12280 T . Based on these results, XP-2 was designated Exiguobacterium oxidotolerans XP-2. The pathogenicity of E. oxidotolerans XP-2 was identified by Koch's Postulate under laboratory conditions. These results enrich the growing list of pathogenic bacteria in commercially cultivated seaweeds and also provide a foundation for investigating the virulence mechanisms of pathogenic bacteria of commercially cultivated seaweeds in the near future.

show abstract

“…It is calculated that about 450 kg of solid waste as well as 50 m 3 of wastewater are released for every 200 kg of leather produced [4]. The tannery wastewater is well known as a complex liquid that contains high levels of organic loading, dissolved and suspended solids, saline, and other specific pollutants [5][6][7][8][9][10]. The wastewater also causes a series long-term affects to both water and soil [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Structural Characteristics and Collagen Reaction Ability of Polyphenols in Larch Tanning Wastewater – an Important Hint for Vegetable Tanning Wastewater Recycling

Teng

Wang

et al. 2017

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

Wastewater recycling technologies have been widely used in tanneries to reduce environmental impacts. However, only a few recycling methods have been developed for vegetable tanning processes due to limited knowledge of their wastewaters. In this study, the structures of the polyphenols in the larch tanning wastewater (LTW) and commercial larch tannin (CLT) were characterized with spectrographic and chromatographic analysis. Structures of these polyphenols were illustrated accordingly; their collagen reaction abilities were then tested with thermal analysis and visualized with a molecular docking software. Results showed that polyphenols in LTW and CLT were all procyanidins. However, average molecular weight of the polyphenols in LTW was 1104Da, in contrast to an obviously higher value for the CLT sample (3334Da). Meanwhile, the LTW presented obvious lower reactivity in the collagen-polyphenol reaction, including lower thermal stabilities and docking energies, fewer hydrogen bonds, and lower interaction energies. These results provide a hint for vegetable tanning wastewater recycling: because of these structural differences, reactivity of the polyphenols in wastewater are lower than the ones in commercial tannins. Therefore, before the recycling processes, polyphenols must be chemically modified in accordance with these structural differences.

show abstract

Chromate-Reducing Profile of Bacterial Strains Isolated from Industrial Effluents

Cited by 10 publications

References 16 publications

16S rRNA sequences of Exiguobacterium spp. bacteria dominant in a biofloc pond cultured with whiteleg shrimp, Penaeus vannamei

16S rRNA sequences of Exiguobacterium spp. bacteria dominant in a biofloc pond cultured with whiteleg shrimp, Penaeus vannamei

Isolation and identification of a pathogenic bacterium, Exiguobacterium oxidotolerans XP-2, from the abnormal diseased mature sporophytes of a commercially cultivated brown seaweed Saccharina japonica

Structural Characteristics and Collagen Reaction Ability of Polyphenols in Larch Tanning Wastewater – an Important Hint for Vegetable Tanning Wastewater Recycling

Contact Info

Product

Resources

About