Evaluation of heavy metals tolerant bacterial strains as antioxidant agents and plant growth promoters

This study aimed to evaluate three heavy metal tolerant bacterial strains (HMTB) namely Alcaligenes faecalis MG257493.1, Bacillus cereus MG257494.1 and Alcaligenes faecalis MG966440.1 as antioxidant agents and plant growth promotors under laboratory conditions. Their abilities to inhibit 2,2-DiPhenyl-2-Picrylhydrazyl hydrate (DPPH) as non-enzymatic antioxidant activity and produce plant growth promoters (indole acetic acid (IAA), gibberellins (GA3), salicylic acid (SA), proline (Pro.), sidrophores, exopolysaccharide (EPS) and biosurfactant) were estimated in presence of four heavy metals Zinc (Zn2+) cadmium (Cd2+), copper (Cu2+) and lead (Pb2+) at 1000 and 1500 mg/l. Results showed that the antioxidant activities of three strains were increased with the increasing of heavy metals concentration. All tested strains were able to produce all estimated plant growth promoters in the presence or absence of heavy metals and the highest amounts of all compounds were recorded in media free of heavy metals and decreased with the increasing of heavy metals concentration. Also, results proved that the three evaluated strains were considered as heavy metal tolerant-plant growth promoting bacteria (HMT-PGPB) and have beneficial characteristics for remediating the contaminated mine tailing soil.
Source: Biocatalysis and Agricultural Biotechnology - Category: Biotechnology Source Type: research

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Conclusions: This work provides two new effective quaternized canthin-6-one derivatives as candidate bactericide, promoting the development of natural-sourced bactericides and preservatives.
Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
Publication date: Available online 13 April 2019Source: Materials Science and Engineering: CAuthor(s): Harish Chandra, Deepak Patel, Pragati Kumari, J.S. Jangwan, Saurabh YadavAbstractThe field of nanoscience or nanotechnology is gaining popularity day by day and it is now well established field of interdisciplinary sciences. Nanoparticles are synthesized by various methods but suffer from few limitations such as toxicity. To overcome the limitations of various synthesis methods, the focus has shifted to new radius which involves biological organisms such as plants i.e. green synthesis. This phyto-mediated approach using v...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
Publication date: Available online 13 April 2019Source: Materials Science and Engineering: CAuthor(s): Shahnaz Majeed, Farah Hanani Binti Aripin, Nur Syafiqah Binti Shoeb, Mohammed Danish, M.N. Mohamad Ibrahim, Rokiah HashimAbstractThe aim of the current study was to biosynthesize the silver nanoparticles (AgNPs) from the bacterial strain of Bacillus cereus (ATCC 14579) extracellularly. When bacterial extract was challenged with 1 mM silver nitrate (AgNO3) the color of the extract changed into brown confirms the formation of nanoparticles. These nanoparticles were capped with bovine serum albumin (BSA). UV- visible spect...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
Publication date: Available online 17 April 2019Source: Microbial PathogenesisAuthor(s): Fatima Nehal, Mouna Sahnoun, Slim Smaoui, Bassem Jaouadi, Samir Bejar, Sbaihia MohammedAbstractA new exopolysaccharide (EPS) was produced by the Lactococcus lactis F-mou strain (LT898177.1) isolated from the Sahrawi camel milk in the Bir-Naam region, Algeria. The most influential production parameters were screened by the Plackett-Burman design for enhancing EPS yield utilizing the Mech-Degla juice as a low-cost raw material. An optimum condition of a 0.49 of inoculum size, a 100 rpm of agitation rate, and a 12 h of incubation peri...
Source: Microbial Pathogenesis - Category: Infectious Diseases Source Type: research
R. Akamatsu et al.
Source: Emerging Infectious Diseases Journal - Category: Infectious Diseases Source Type: research
This study provides new insight into the characterization of foodborne C. perfringens and highlights the potential of WGS for the investigation of FBOs. Introduction Clostridium perfringens is a Gram-positive, spore-forming, anaerobic, rod-shaped bacterium, known as an important causative agent of foodborne and non-foodborne gastroenteritis (Grass et al., 2013). The ability of this bacterium to form resistant spores contributes to its survival in many environmental niches, including soil, sewage, foods, and the intestinal microbiota of humans and animals (Xiao, 2014; Li et al., 2016). C. perfringens can cause necro...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
In this study, isolates of Gram positive Lysinibacillus xylanilyticus associated with red seaweed species were evaluated for antibacterial activity against plant pathogenic bacterium X. oryzae pv. oryzae which cause bacterial blight in rice using disc and well diffusion assays. The isolate HVT234 among the isolates of L. xylanilyticus associated with red seaweed species exhibit high antibacterial activity. The optimum level of extracellular antibacterial protein synthesize in HVT234 was recorded when cultured in 1.5% inoculum in seawater medium with lactose carbon and ammonium chloride nitrogen at pH 7.0 at 35 °C f...
Source: Biocatalysis and Agricultural Biotechnology - Category: Biotechnology Source Type: research
This study aimed to (1) compare content, composition, and antimicrobial activity of J. oxycedrus EO samples from plants growing in Bulgaria and Serbia, and (2) quantify morphological variations of leaves. Тhe EO content (yield) in dried juniper leaves varied from 0.06% (Кopaonik, Serbia) to 0.24% (Markovo, Bulgaria). We identified 51 EO constituents, belonging to monoterpenes, sesquiterpenes, and diterpenes. The class monoterpenes (monoterpene hydrocarbons and oxygenated monoterpenes) were the predominant compounds, representing 38.6–65.4% of the total EO, consisting primarily of α-pinene, limonene, sabinene,...
Source: Biochemical Systematics and Ecology - Category: Biochemistry Source Type: research
Conclusion γPGA-producing Bacillus spp. were isolated during fermentation of OSL and LOSL at 0–12 h. These isolates exhibited antibacterial and ACE inhibitory activities at different concentrations. The individual antibacterial activities of γPGA were bacteriostatic while the combined use exhibited bactericidal characteristics. Although the ACE inhibitory activities were low, OSL and LOSL are promising sources for developing functional microorganisms with a beneficial impact on health. The importance lies in the benefits derived from the use of local resources. Author Contributions TA contributed to th...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Conclusions Nucleoside hydrolases are vital enzymes for the replication of Leishmania, conserved phylogenetic marker of the genus and strong-specific immunogens. We demonstrated that NH36 is an excellent target for chemotherapy of visceral leishmaniasis. Searching for the most immunogenic fraction of promastigotes of Leishmania we described the FML antigen of L. (L.) donovani, that has as its main component, the NH36 Nucleoside hydrolase. We developed second–generation vaccines with the FML and the NH36 native antigens, and with the NH36 recombinant protein. In addition, we obtained a third generation vaccine based ...
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
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