scholarly journals Bacterial Consortiums Able to Use Metal-Cyanide Complexes as a Nitrogen Source

Proceedings ◽  
2018 ◽  
Vol 2 (20) ◽  
pp. 1284
Author(s):  
María Isabel Igeño ◽  
Daniel Macías ◽  
María Isabel Guijo ◽  
Rubén Sánchez-Clemente ◽  
Ana G. Población ◽  
...  
Keyword(s):  
Nitrogen Source ◽  
Industrial Effluents ◽  
Free Form ◽  
Bacterial Strains ◽  
Pseudomonas Pseudoalcaligenes ◽  
Metal Cyanide ◽  
Biodegradation Process ◽  
Cyanide Complexes ◽  
Cyano Compounds

Most cyanide-containing industrial effluents also contain other cyano-derivatives and high amounts of metals and metal-cyanide compounds. For this reason, the biotreatment of these wastes requires the use of microorganisms capable to degrade all these different cyano-compounds and to tolerate metals. Pseudomonas pseudoalcaligenes CECT 5344 is a cyanotrophic bacterium capable of metabolize cyanide in its free form, but it is not very efficient at degrading metal-cyanide complexes. Therefore, for the optimization of the cyanide biodegradation process it is essential to find and characterize new bacterial strains, capable of assimilating metal cyanide-complexes, to complement the capacities of P. pseudoalcaligenes CECT 5344.

Highly active double metal cyanide complexes: Effect of central metal and ligand on reaction of epoxide/CO2

2007 ◽  
Vol 18 (7) ◽  
pp. 887-890 ◽  
Author(s):  
Xing Hong Zhang ◽  
Shang Chen ◽  
Xian Ming Wu ◽  
Xue Ke Sun ◽  
Fei Liu ◽  
...  
Keyword(s):  
Central Metal ◽  
Metal Cyanide ◽  
Highly Active ◽  
Cyanide Complexes

scholarly journals Biodegradation of two organic UV-Filters by single bacteria strains

2021 ◽  
Author(s):  
Florentina Laura Chiriac ◽  
Catalina Stoica ◽  
Iuiana Paun ◽  
Florinela Pirvu ◽  
Toma Galaon ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Emerging Contaminants ◽  
Degradation Products ◽  
Aquatic Organisms ◽  
Uv Filters ◽  
Bacterial Strains ◽  
Gram Negative ◽  
Biodegradation Process ◽  
Salmonella Thyphimurium ◽  
Organic Uv Filters

Abstract Organic UV-filters, including 4-hydroxybenzophenone (4-HBP) and 2,4-dihydroxybenzophenone (BP-1), are persistent emerging contaminants whose presence in the environment poses a threat to aquatic organisms due to their endocrine disruptor’s properties. For this reason, finding suitable technological processes for their safety and efficient removal from the environment represent a priority for the scientific community. To the author’s knowledge, until now, there are no studies reporting the biodegradation of 4-HBP and BP-1 by a single bacteria strain. In this paper, there were tested the 4-HBP and BP-1 biodegradation potential of two Gram-positive (Staphylococcus aureus and Enterococcus faecalis) and two Gram-negative (Salmonella typhimurium and Serratia rubidae). The 4-HPB biodegradation process was observed only in the presence of Gram-negative bacterial strains. Thus, the biodegradation rates of 4-HBP reached up to 12.7% after 24h of incubation in presence of Salmonella thyphimurium and up to 24.0% after 24h of incubation with Serratia rubidae. Staphylococcus aureus was able to biodegrade 26.7% of BP-1, while Salmonella thiphymurium was able to biodegrade 14.7% of BP-1 after 24h of incubation. Their biodegradation products generated during the 4-HBP biodegradation process by Serratia rubidae were analyzed through LC-MS/MS analysis. The (bio)degradation products were benzophenone and a multi-hydroxylated derivative of 4-HBP and the degradation pathways were proposed. The data obtained in this study gave important information regarding the 4-HBP and BP-1 potential biodegradation by single bacterial strains.

scholarly journals Optimizing the Management of Cadmium Bioremediation Capacity of Metal-Resistant Pseudomonas sp. Strain Al-Dhabi-126 Isolated from the Industrial City of Saudi Arabian Environment

2019 ◽  
Vol 16 (23) ◽  
pp. 4788 ◽  
Author(s):  
Naif Abdullah Al-Dhabi ◽  
Galal Ali Esmail ◽  
Abdul-Kareem Mohammed Ghilan ◽  
Mariadhas Valan Arasu
Keyword(s):  
Bacterial Strain ◽  
Cadmium Toxicity ◽  
Industrial Effluents ◽  
Pseudomonas Sp ◽  
Bacterial Strains ◽  
16S Rdna Gene ◽  
Sequence Characterization ◽  
Industrial City ◽  
Toxic Pollutant ◽  
Cd Removal

In this study, 23 bacterial strains were isolated from a Cadmium (Cd) contaminated soil in the industrial city, Riyadh of Saudi Arabia. Among these isolates six strains were found to withstand cadmium contamination and grow well. From the six isolates Pseudomonas sp. strain Al-Dhabi-122–127 were found to resist cadmium toxicity to a higher level. The isolates were subjected to biochemical and 16S rDNA gene sequence characterization to confirm their identification. The bacterial strain Al-Dhabi-124 showed 1.5 times higher Cd-degrading activity than Al-Dhabi-122 and Al-Dhabi-123, and Al-Dhabi-126 exhibited 3.5 times higher Cd-degrading activity, higher than the other strains. An atomic absorption spectrophotometer study showed that the strain Al-Dhabi-126 absorbed Cd, and that the bacterial strain Al-Dhabi-126 was found to tolerate cadmium level up to 2100 µg/mL. The bacterial strain Al-Dhabi-126 showed a maximum Cd removal efficacy at pH between 6.0 and 8.0. The efficacy decreased sharply after an increase in pH (9.0). An optimum temperature of 50 °C and pH 6.0 were found to be effective for the Cd removal process by the isolate. The study indicated that the bacterial strain Al-Dhabi-126 can be used effectively for the bioremediation of heavy metals like cadmium, a major toxic pollutant in industrial effluents.

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