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Growth of MoSe2 electrocatalyst from metallic molybdenum nanoparticles for efficient hydrogen evolution
Saim Emin, Plamen Stefanov, Burhancan Aktarla, Takwa Chouki, Boriana Donkova, 2021, izvirni znanstveni članek

Opis: Molybdenum diselenide (MoSe2) is an emerging alternative to platinum-group-metal electrocatalysts for the hydrogen evolution reaction (HER). Herein, the chemical vapor deposition (CVD) approach was demonstrated to be a successful route to grow MoSe2 thin films using colloidal molybdenum nanoparticles (Mo NPs). T
Ključne besede: Water splitting, electrocatalyst, MoSe2
Objavljeno: 15.01.2021; Ogledov: 22; Prenosov: 0
.pdf Polno besedilo (5,12 MB)

Treatment strategies targeting persister cell formation in bacterial pathogens
Fazlurrahman Khan, Dung Pham, Nazia Tabassum, Sandra Folarin Oloketuyi, Young-Mog Kim, 2020, pregledni znanstveni članek

Opis: Persister cells are transiently antibiotic-tolerant and dormant subpopulations that are produced to escape the effects of antibiotics within biofilms or planktonic cell populations. Persister cells are of high clinical importance due to their tolerance to antimicrobial agents and subsequent failure in antibiotic treatments. Understanding persister cell formation mechanisms is therefore highly important for developing effective therapeutic strategies against pathogenic bacterial persisters. Several anti-persister compounds have been previously identified via isolation from natural resources or chemical synthesis. Furthermore, a combination of these compounds with antibiotics or non-antibiotic drugs also allows action on multiple targets while reducing the administration frequency. Here, we present a comprehensive overview of the clinical importance and formation mechanisms of persister cells as well as the current treatment strategies against persister cell formations in chronic infections.
Ključne besede: Biofilm, anti-persister agents, persister cells, pathogenic bacteria, chronic infections
Objavljeno: 14.01.2021; Ogledov: 20; Prenosov: 0
.pdf Polno besedilo (3,31 MB)

Molecules involved in motility regulation in Escherichia coli cells: a review
Fazlurrahman Khan, Nazia Tabassum, Dung :Pham, Sandra Folarin Oloketuyi, Young-Mog Kim, 2020, izvirni znanstveni članek

Opis: The initial colonization of the host organism by commensal, probiotic, and pathogenic Escherichia coli strains is an important step in the development of infections and biofilms. Sensing and colonization of host cell surfaces are governed by flagellar and fimbriae/pili appendages, respectively. Biofilm formation confers great advantages on pathogenic E. coli cells such as protection against the host immune system, antimicrobial agents, and several environmental stress factors. The transition from planktonic to sessile physiological states involves several signaling cascades and factors responsible for the regulation of flagellar motility in E. coli cells. These regulatory factors have thus become important targets to control pathogenicity. Hence, attenuation of flagellar motility is considered a potential therapy against pathogenic E. coli. The present review describes signaling pathways and proteins involved in direct or indirect regulation of flagellar motility. Furthermore, application strategies for antimotility natural or synthetic compounds are discussed also.
Ključne besede: Biofilm formation, Escherichia coli, inhibition, motility, pathogenesis
Objavljeno: 14.01.2021; Ogledov: 19; Prenosov: 0
.pdf Polno besedilo (2,42 MB)

Scientific Advancement in Contemporary Society: Interface between Technology, Law and Science
Adetutu Aina-Pelemo, Ananya Patil, Paul Ejembi, Sandra Folarin Oloketuyi, Iseoluwa Aina, 2019, izvirni znanstveni članek

Opis: This article is premised on the relation of technology and applied sciences with law. The three subjects are not only interwoven but cannot be protected and regulated without the viable use of law. The unprecedented advancement ofscientific innovations has far-reaching implication in virtually all ramifications of human endeavour. Technology is an invention created using science, which needs to be sustained by prudent management and law. The research goal is to narrow down a middle ground where all these independent fields can meet and share a symbiotic relationship without stifling each other. The research seeks to ascertain the knowledge and perception of selected university students of Nigeria and India, about Science, Law and Technology. The authors adopted the doctrinal and empirical research methodology coupled with the use of cases and legislations as source of information. The research revealed that majority of the participants has knowledge about the co-existence and impact of Science, Technology and Law in the society. However, the attitude and perception of the participants constitute a fundamental influence on the degree to which technological orientations occur during learning process. Also, 85% of 200 participants agreed that there is need for frequent education and legislation as science and technology evolves in the society. Hence, this article recommends the implementation and frequent modifications of law to continually protect, encourage and ensure the societal sustainability of ethical standards.
Ključne besede: Advancement, Law, Relations, Science, Sustainability, Technology
Objavljeno: 14.01.2021; Ogledov: 19; Prenosov: 0
.pdf Polno besedilo (572,25 KB)

Chitosan and their derivatives: Antibiofilm drugs against pathogenic bacteria
Fazlurrahman Khan, Dong Pham, Sandra Folarin Oloketuyi, Panchanathan Manivasagan, Junghwan Oh, Young-Mog Kim, 2020, pregledni znanstveni članek

Opis: Biofilm formed by several pathogenic bacteria results in the development of resistance against antimicrobial compounds. The polymeric materials present in the biofilm architecture hinder the entry of antimicrobial compounds through the surface of bacterial cells which are embedded as well as enclosed beneath the biofilm matrix. Recent and past studies explored the alternative approaches to inhibit the formation of biofilm by different agents isolated from plants, animals, and microbes. Among these agents, chitosan and its derivatives have got more attention due to their properties such as biodegradability, biocompatibility, non-allergenic and non-toxicity. Recent researches have focused on employing chitosan and its derivatives as effective agents to inhibit biofilm formation and attenuate virulence properties by various pathogenic bacteria. Such antibiofilm activity of chitosan and its derivatives can be further enhanced by conjugation with a wide range of bioactive compounds. The present review describes the antibiofilm properties of chitosan and its derivatives against the pathogenic bacteria. This review also summarizes the mechanisms of biofilm inhibition exhibited by these molecules. The knowledge of the antibiofilm activities of chitosan and its derivatives as well as their underlying mechanisms provides essential insights for widening their applications in the future.
Ključne besede: Antibiofilm, Biofilm inhibition, Chitosan, Chitosan derivatives, Pathogenic bacteria
Objavljeno: 14.01.2021; Ogledov: 17; Prenosov: 0
.pdf Polno besedilo (3,95 MB)

Antimicrobial efficacy and phytochemical screening of Mushrooms, Lenzites betulinus, and Coriolopsis gallica extracts.
Soji Fakoya, Sandra Folarin Oloketuyi, 2012, izvirni znanstveni članek

Opis: AIM: The spread of multidrug-resistant strains of bacteria makes it necessary to discover new classes of antibacterial and compounds that inhibit these resistant mechanisms. Hence, this study was conducted to evaluate the antimicrobial activities of Lenzites betulinus and Coriolopsis gallica extracts against some bacterial isolates of medical importance. METHOD: The organisms are Pseudomonas aeruginosa, Staphylococcus aureus, Proteus vulgaris, Klebsiella pneumoniae, Escherichia coli. Using agar well diffusion assay, the ethanolic, petroleum ether and aqueous extract of C. gallica was assayed against the bacterial isolates and the result showed that Petroleum ether extract of C. gallica and L. betulinus was able to inhibit P. vulgaris with inhibition zones of 26.0 mm and 20.0 mm respectively. RESULTS: Ethanolic extract of C. gallica also inhibited P. vulgaris with inhibition zone of 22.0 mm while aqueous extract and petroleum ether of L. betulinus inhibited P. aeruginosa with inhibition zones of 20.0 mm and 23.0 mm respectively. E. coli and S. aureus were also inhibited by the aqueous and ethanolic extract of L. betulinus with zones of inhibition 15.0 mm and 26.0 mm against E. coli while 19.0 mm and 22.0 mm against S. aureus respectively. This study also showed the presence of some phytochemicals like tannins, phenolics, flavonoids, steroids, and saponin in the mushrooms with antimicrobial effects against the bacterial isolates used. CONCLUSION: The active components present in ethanolic, aqueous and petroleum ether extracts of C. gallica include phenolics, flavonoids, and steroids while phytochemicals obtained from L. betulinus are phenolics, tannins, flavonoids, and saponin respectively.
Ključne besede: Coriolopsis gallica, Lenzites betulinus, Antimicrobial, Phytochemicals, Bacterial İsolates
Objavljeno: 14.01.2021; Ogledov: 16; Prenosov: 0
.pdf Polno besedilo (500,85 KB)

Inhibition strategies of Listeria monocytogenes biofilms- Current knowledge and future outlooks.
Sandra Folarin Oloketuyi, Fazlurrahman Khanna, 2017, pregledni znanstveni članek

Opis: There is an increasing trend in the food industry on the Listeria monocytogenes biofilm formation and inhibition. This is attributed to its easy survival on contact surfaces, resistance to disinfectants or antibiotics and growth under the stringent condition used for food processing and preservation thereby leading to food contamination products by direct or indirect exposure. Though, there is a lack of conclusive evidences about the mechanism of biofilm formation, in this review, the concept of biofilm formation and various chemical, physical, and green technology approaches to prevent or control the biofilm formed is discussed. State-of-the-art approaches ranging from the application of natural to synthetic molecules with high effectiveness and non-toxicity targeted at the different steps of biofilm formation could positively influence the biofilm inhibition in the future.
Ključne besede: Listeria monocytogenes, biofilm, food industry, inhibition, pathogen
Objavljeno: 14.01.2021; Ogledov: 19; Prenosov: 0
.pdf Polno besedilo (697,40 KB)
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Antimicrobial susceptibility profile of airborne bacteria and fungi at Owena Market, Osun State, Nigeria
Gbenga Folorunsho Oginni, Sandra Folarin Oloketuyi, Olufunke Chukwu, Janet Odunayo, 2017, izvirni znanstveni članek

Opis: Environmental conditions and human activities influence the ubiquity and diversity of microorganisms in the atmosphere thereby acquiring the ability to resist antibiotics which poses serious public threat. Airborne bacteria and fungi isolated using settling plate method from three different points (where kolanuts, meat and onions are sold) at Owena Market, Osun state, Nigeria were assayed for antimicrobial susceptibility using disc diffusion. The microorganisms were identified as Staphylococcus aureus, Bacillus subtilis, Bacillus cereus, Proteus vulgaris, Bacillus megaterium, Alcaligenes spp., Aeromonas spp., Escherichia coli, Micrococcus spp., Streptococcus spp., Mortierella polycephala, Epicoccum nigrum, Alternaria spp., Penicillium chrysogenum, Aspergillus flavus, Acremonium spp., Penicillium oxalicum, Cladosporium cladosporiodes, Rhizopus stolonifer, Stemphylium spp., and Trichoderma spp. About 30% of the bacterial isolates were resistant to the antibacterial agents (antibiotics) and all the bacterial isolates were resistant to at least four or more antibiotics while 18% and 64% of the fungi isolated were susceptible to griseofulvin and ketoconazole, respectively. This study shows that the market environment serves as reservoirs for multiple antibiotic resistant bacteria and fungi capable of causing infectious diseases.
Ključne besede: Airborne microbes, air monitoring, diversity, human activities, multidrug resistance
Objavljeno: 14.01.2021; Ogledov: 8; Prenosov: 0
.pdf Polno besedilo (728,86 KB)

Antibiotics and their different application strategies in controlling the biofilm forming pathogenic bacteria
Fazlurrahman Khan, Dung T N Pham, Sandra Folarin Oloketuyi, Young-Mog Kim, 2020, pregledni znanstveni članek

Opis: Background: The establishment of a biofilm by most pathogenic bacteria has been known as one of the resistance mechanisms against antibiotics. A biofilm is a structural component where the bacterial community adheres to the biotic or abiotic surfaces by the help of Extracellular Polymeric Substances (EPS) produced by bacterial cells. The biofilm matrix possesses the ability to resist several adverse environmental factors, including the effect of antibiotics. Therefore, the resistance of bacterial biofilm-forming cells could be increased up to 1000 times than the planktonic cells, hence requiring a significantly high concentration of antibiotics for treatment. Methods: Up to the present, several methodologies employing antibiotics as an anti-biofilm, antivirulence or quorum quenching agent have been developed for biofilm inhibition and eradication of a pre-formed mature biofilm. Results: Among the anti-biofilm strategies being tested, the sub-minimal inhibitory concentration of several antibiotics either alone or in combination has been shown to inhibit biofilm formation and down-regulate the production of virulence factors. The combinatorial strategies include (1) combination of multiple antibiotics, (2) combination of antibiotics with non-antibiotic agents and (3) loading of antibiotics onto a carrier. Conclusion: The present review paper describes the role of several antibiotics as biofilm inhibitors and also the alternative strategies adopted for applications in eradicating and inhibiting the formation of biofilm by pathogenic bacteria.
Ključne besede: Antibiotics, biofilm inhibition, multiple antibiotics, pathogenic bacteria, resistance mechanism, virulence factors
Objavljeno: 14.01.2021; Ogledov: 8; Prenosov: 0
.pdf Polno besedilo (2,61 MB)

A future perspective on neurodegenerative diseases: Nasopharygneal and gut microbiota
Fazlurrahman Khan, Sandra Folarin Oloketuyi, 2016, pregledni znanstveni članek

Opis: Neurodegenerative diseases are considered a serious life‐threatening issue regardless of age. Resulting nerve damage progressively affects important activities, such as movement, coordination, balance, breathing, speech and the functioning of vital organs. Reports on the subject have concluded that neurodegenerative disease can be caused by mutations of susceptible genes, alcohol consumption, toxins, chemicals and other unknown environmental factors. Although several diagnostic techniques can be used to determine aetiologies, the process is difficult and often fails. Research shows that nasopharyngeal and gut microbiota play important roles in brain to spinal cord coordination. However, no conclusive epidemiologic evidence is available on the roles played by respiratory and gut microbiota in the development of neurodegenerative diseases. Thus, understanding the connection between respiratory and gut microbiota and the nervous system could provide information on causal links. The present review describes future perspectives on the role played by nasopharyngeal and gut microbiota in the development of neurodegenerative diseases.
Ključne besede: culture‐independent, gut, microbiota, nasopharyngeal, neurodegenerative disease
Objavljeno: 14.01.2021; Ogledov: 7; Prenosov: 0
.pdf Polno besedilo (630,54 KB)

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