Microbiology Research Journal International http://journalmrji.com/index.php/MRJI <p style="text-align: justify;"><strong>Microbiology Research Journal International (ISSN:&nbsp;2456-7043)</strong> is dedicated to publish research papers, reviews, and short communications in all areas of Microbiology such as virology, mycology, parasitology, bacteriology, clinical microbiology, phycology, parasitology, protozoology, microbial physiology, immunology, microbial genetics, medical microbiology, microbial pathogenesis and epidemiology disease pathology and immunology, probiotics and prebiotics</p> SCIENCEDOMAIN international en-US Microbiology Research Journal International 2456-7043 Antibacterial Effects of Oregano Essential Oil (OEO) and Its Potential Applications http://journalmrji.com/index.php/MRJI/article/view/30209 <p>Essential oils (EOs) are commonly used in food industry, due that they possess antioxidative and antimicrobial properties. There are few essential oils that have been used in medicine, due to its potent antibacterial activity against intrahospital pathogens. OEO has experimentally shown potent antibacterial effect on nosocomial Gram-positive bacteria, therefore it can be very useful in hospital environments, where there are many bacterial pathogens, which are the etiological agents of nosocomial infections and most of them are resistant to several antibiotics.</p> <p><strong>Objective:</strong> The aim of this study was to determine antimicrobial effect of OEO on most frequent bacterial intrahospital pathogens: MRSA, MRSE comparatively to selected ATCC bacterial reference strains.</p> <p><strong>Methods:</strong> This experimental study investigates the antibacterial action of oregano (<em>Origanum vulgare</em>) essential oil (OvEO) on two human pathogens: <em>Staphylococcus aureus</em> (SA) and <em>Staphylococcus epidermidis </em>(SE) Here, we used OEO against one of the most prominent antibiotic-resistant bacterial strains: methicillin-resistant SA (MRSA<em>mecA+ </em>= Meticillin Resistant SA and <em>mecA- = Meticillin</em><em> Resistance SA</em> ), methicillin-resistant SE (MRSEmecA+ = Meticillin Resistance Staphylococcus epidermidis <em>mecA+</em>) and reference strains: <em>S. aureus </em>ATCC 700699,<em> S. epidermidis </em>ATCC 359845 and <em>E. coli </em>ATCC 25922. Bactericidal effects of the OEO on these bacteria were mainly evaluated using undiluted and four serial dilutions in coconut oil (CCO) l: 1:10, 1:100, 1:200, 1:400.</p> <p><strong>Results: </strong>OEO, undiluted and 4 serial dilutions showed potent antibacterial activity against all strains tested. In conclusion, this OEO could be used as an alternative in medicine. The ability of OEO to inhibit and kill clinical Multi-Drug-Resistant (MDR): MRSA and MRSE strains, highlights it´s potential for use in the management of drug-resistant MDR infections in hospitals wards.</p> R. Cabrera-Contreras R. Morelos-Ramírez J. P. Quiróz-Ríos D. Muñoz-Quiróz ##submission.copyrightStatement## 2020-05-19 2020-05-19 19 25 10.9734/mrji/2020/v30i430209 Antifungal Activity of Pericopsis (Afrormosia) laxiflora (Benth.) Bark on Ringworm Germs http://journalmrji.com/index.php/MRJI/article/view/30207 <p>Dermatophytes are responsible for ringworms that are very often found on the heads of children in Africa. In Côte d'Ivoire, ringworms have been the subject of several studies revealing fairly high frequencies.</p> <p><strong>Aims: </strong>The present work consisted essentially in studying the antifungal activity of the barks of <em>Pericopsis laxiflora</em>, a plant from the Ivorian pharmacopoeia on germs responsible for ringworm.</p> <p><strong>Methodology:</strong> The 70% hydroethanolic extract of the bark of <em>Pericopsis laxiflora</em> was prepared and tested on <em>Trichophyton mentagrophytes</em> and <em>Trichophyton rubrum</em>. In addition, by staining and precipitation tests, phytochemical sorting was carried out on this extract.</p> <p><strong>Results:</strong> Faced with the hydroethanolic extract, <em>Trichophyton mentagrophytes</em> recorded a Minimun Inhibitory Concentration (MIC) which is equal to the Minimun Fungicidal Concentration(MFC) (MIC = MFC = 6.25 mg/mL). For the fungal strain of <em>T. rubrum</em>, the MFC obtained (100 mg/mL) was twice the MIC (50 mg/mL). The phytochemical study of this extract revealed the presence of sterols and polyterpenes, flavonoids and catechic tannins.</p> <p><strong>Conclusion:</strong> The results suggest that <em>P. laxiflora</em> extract could therefore be useful in the fight against dermatophytes.</p> Ouattara Abou Bolou Gbouhoury Eric-Kévin Koffi Allali Eugène Yasseu Hyacinthe Ouattara Karamoko Coulibaly Adama ##submission.copyrightStatement## 2020-05-11 2020-05-11 1 9 10.9734/mrji/2020/v30i430207 Polyethylene Biodegradation Potentials of Pseudomonas aeruginosa and Micrococcus sp. Isolated from Waste Dumps and Farmlands in Nsukka, Enugu State, Nigeria http://journalmrji.com/index.php/MRJI/article/view/30208 <p><strong>Background:</strong> Low Density Polyethylene (LDPE) are plastic materials extensively used in packaging, constituting recalcitrant environmental pollutants that defy natural degradation processes.</p> <p><strong>Aim:</strong> This study isolated bacteria from a Nigerian environment and assessed their potential for LDPE biodegradation.</p> <p><strong>Methods:</strong> Using standard procedures, Bacteria were isolated from polythene samples collected from farmlands and waste dump sites in Nsukka metropolis. Mineral salt medium (MSM) was prepared, with LPDE as sole carbon source, and used for isolation. Optical density (OD<sub>600</sub> nm) was used to study bacterial growth on LDPE as sole carbon source as proof of biodegradation. Both organisms demonstrated steady growth on LDPE over time.</p> <p><strong>Results:</strong> <em>Pseudomonas aeruginosa</em> and <em>Micrococcus</em> sp. were identified based on morphological and biochemical characteristics. Ability to grow on LDPE as a sole carbon source was studied as evidence of polyethylene biodegradation. Organisms were inoculated into MSM and incubated at 37°C and 50°C for 15 days. Maximum growth was recorded after 15 days of incubation for both organisms. <em>P. aeruginosa</em> and <em>Micrococcus</em> sp. showed steady growth at 37°C as well as 50 ⁰C. <em>Micrococcus</em> sp. recorded highest growth; 0.324 nm and 0.312 nm at 37°C and 50°C respectively, after 15 days. Similarly, <em>P. aeruginosa</em> recorded highest growth of 0.40 nm and 0.258 nm for 37°C and 50°C respectively. LDPE degradation increased with increase in time.</p> <p><strong>Conclusion:</strong> This study demonstrates the enormous polyethylene-degrading potentials of <em>P. aeruginosa</em> and <em>Micrococcus</em> sp. isolated from Nsukka, Nigeria.</p> Vincent Chigor Chidiebele Nwankwo Uchenna Ogbodo Joseph Ugwu ##submission.copyrightStatement## 2020-05-19 2020-05-19 10 18 10.9734/mrji/2020/v30i430208 Nasal Carriage of Methicillin-Resistant Staphylococcus aureus in Intensive Care Units of Two University Hospitals in Cameroon http://journalmrji.com/index.php/MRJI/article/view/30210 <p><strong>Aim:</strong> The aim of this work was to carry out a screen for methicillin-resistant <em>Staphylococcus aureus</em> (<em>S. aureus</em>) in nasal cavity of patients in the intensive care units of the University Hospital Center (UHC) and the Central Hospital of Yaounde (CHY) in Cameroon.</p> <p><strong>Study Design:</strong> A cross-sectional descriptive study was carried out.</p> <p><strong>Pace and Duration of the Study:</strong> Collection of nasal swab was done in Intensive Care Unit of University Teaching Hospital of Yaounde, and Intensive Care Unit of Central Hospital of Yaounde. Identification and susceptibility test were done in bacteriology laboratory of University Hospital Center, Yaounde between August 2018 and March 2019.</p> <p><strong>Methods: </strong>Nasal swabs were collected from patients by performing rotation in each nose. The identification of bacteria was carried out by observation of mannitol fermentation on Chapman agar, catalase, coagulase and DNAse tests. The susceptibility test was carried out by the method of diffusion of the discs in Mueller-Hinton agar.</p> <p><strong>Results:</strong> A total of 29 <em>S. aureus</em> were identified from 127 patients of which 44.10% were women &nbsp;and 55.90% were men. The antibiotic resistance profile showed cross-resistance of <em>S. aureus</em> between cefoxitin and others antibiotics with high resistance of amoxicillin, Amoxi / Clavulanic, fusidic acid, gentamycin and tetracycline with rates ranging from 62% to 82%. We detected 58.62% resistant species to cefoxitin and 51.72% were resistant to vancomycin. Statistical analysis found that there was not association between age groups, gender with nasal carriage of <em>S. aureus</em>. However there was an association (P=0,0060) between the hospital attended and the portage of <em>S. aureus.</em></p> <p><strong>Conclusion:</strong> The prevalence of Methicillin-resistant <em>S. aureus</em> (MRSA) is quite high in intensive care patients. <em>Staphylococcus aureus</em> isolated from carriers also shows resistance to others antibiotics. This can increase the incidence of nosocomial infections. There is a need to implement effective control strategies to prevent infection cross transmission in intensive care Units.</p> Hortense Gonsu Kamga Yves Le Grand Napa Tchuedji Emilia Lyonga Mbamyah Jérémie Djiraibe Anicette Chafa Betbeui Michel Noubom Bonaventure Jemea Paul Owono Etoundi Arthur Essomba ##submission.copyrightStatement## 2020-05-23 2020-05-23 26 33 10.9734/mrji/2020/v30i430210 Oxidal® Ameliorates the Ty1 Retrotransposition Induced by Methyl Methanesulfonate in Saccharomyces cerevisiae http://journalmrji.com/index.php/MRJI/article/view/30211 <p><strong>Aim: </strong>The aim of the study was to evaluate the potential of Oxidal® to decrease the Ty1 retrotransposition rate in a model system <em>Saccharomyces cerevisiae</em>.</p> <p><strong>Study Design: </strong><em>Saccharomyces cerevisiae</em> cell suspensions were pre-treated with different concentrations Oxidal® and subsequently treated with 16mM methyl methanesulfonate. (MMS)</p> <p><strong>Methodology: </strong>The potential of various concentrations Oxidal® was evaluated based on “spot” test and Ty1 retro-transposition test.</p> <p><strong>Results: </strong>Data revealed that only 5% Oxidal® possesses some cytotoxic properties. Lack of Ty1 retro-transposition was observed after single treatment with 1, 2.5 and 5% Oxidal® concentrations.</p> <p>On the other hand, all the tested concentrations showed promising results against the standard carcinogen methyl methane sulfonate. The most pronounced anti-carcinogenic and cytoprotective effects were observed after pre-treatment with 2.5% Oxidal®, which could be attributed to the antioxidant properties of the combination of ingredients; methylene blue, salicylic acid and caffeine. Further studies could reveal the exact mechanism of action of the supplement and the role of the antioxidant potential.</p> <p><strong>Conclusion: </strong>New data is provided concerning the potential of Oxidal® at low concentrations to protect <em>Saccharomyces cerevisiae</em> cells from MMS-induced Ty1 retro-transposition. The cytoprotective properties of the supplement were also obtained. These results could be considered as a basis for further studies revealing the exact mechanisms of cell protection of the Oxidal®. Additionally, our data could also serve as an important step of the in-depth research of a potential antiviral activity.</p> Teodora Todorova Martin Dimitrov Ignat Ignatov Georgi Gluhchev Georgi Dinkov ##submission.copyrightStatement## 2020-05-23 2020-05-23 34 42 10.9734/mrji/2020/v30i430211