PSM Microbiology <p style="text-align: justify;">PSM Microbiology (ISSN: 2518-3834) is a peer-reviewed, multidisciplinary, open access,&nbsp; international journal that considers articles on all aspects of microbiology and allied sciences.</p> en-US (PSM Microbiology) (MANI MUGHAL) Tue, 13 Feb 2018 21:23:56 +0000 OJS 60 Anti-Candida activity of cinnamon Inhibition of virulence factors of clinical strains of Candida albicans by essential oil of Cinnamomum zeylanicum <p>Essential oil of cinnamon (<em>Cinnamomum zeylanicum)</em> has been used in medicine and food additives. In the present work, we examined the antifungal activity of essential oil extracted from <em>C. zeylanicum</em> bark against oral opportunistic strains of <em>Candida</em> <em>albicans</em>. In addition, we verified the capability of this essential oil to inhibit fungal adhesion to buccal epithelial cells (BECs), germ tube formation, and proteinase activities. Cinnamon oil presented minimum inhibitory concentration (MIC) values that ranged from 31.2 to 125 µg mL<sup>-1 </sup>against the isolates of the tested <em>C. albicans</em> strains. Cinnamon essential oil could inhibit the adhesion of <em>C. albicans</em> to BECs for all of the isolates tested in present study. The <em>C. albicans</em> strains showed inhibited proteinase production after treatment with cinnamon oil, based on the MIC values determined for each <em>C. albicans </em>strain. Cinnamon oil was also able to inhibit the germ tube formation of all isolates of <em>C. albicans</em>, with the percentage of inhibition ranging from 44.7 to 82.9%. Our results showed that cinnamon oil presented potent antifungal activity and the ability to inhibit virulence factors of oral pathogenic strains of <em>C. albicans</em>.</p> Priscila Cordeiro de Lima Carvalho, Nivea Pereira de Sá, Inayara Cristina Alves Lacerda, Carla Pataro, Luiz Henrique Rosa, Rodrigo Silva Alves, Juliana Pereira Lyon, Carlos Augusto Rosa, Susana Johann ##submission.copyrightStatement## Wed, 21 Feb 2018 22:10:07 +0000 Utilisation of Pesticides by Soil Microorganisms <p>While pesticides are considered somewhat essential in modern agriculture, their indiscriminate use has been linked to loss of biodiversity and ecosystem function as well as accumulation in food produce and the poisoning of groundwater. The utilisation of selected pesticides by microorganisms isolated from soil samples was observed. The pesticides tested were the organophosphorus insecticide – Diazinon and Herbicides – Primextra 500FW and Vetox 85. Detection of a zone of clearing was used to identify the Vetox 85-utilising microorganisms. Utilisers of Diazinon and Primextra 500FW were isolated by enriching the soil with mineral salt broth and providing Diazinon and Primextra as sole carbon and energy sources. This method was equally used for the <em>in vitro</em> degradation of the pesticides. Degradation was monitored using total viable cell numbers, pH and optical density. Generation times and growth rates of selected utilisers were determined. The Vetox 85-utilisers were found to be 0.32% of the total aerobic heterotrophic counts. The pesticide-degraders isolated were <em>Vibrio, Acinetobacter, Pseudomonas, Arthrobacter, Flavobacterium, Bacillus, Aeromonas, Rhizopus </em>and <em>Penicillium </em>species<em>. Vibrio, Acinetobacter, Pseudomonas, Arthrobacter</em> and <em>Rhizopus</em> were selected for degradation studies.<em> Vibrio</em> sp. showed the greatest pesticide utilisation capacity unexpectedly surpassing the mixed cultures, however, mixed cultures generally showed better degradative capacities than single cultures.&nbsp; <em>Vibrio</em> sp. had the highest growth rate while <em>Rhizopus</em> sp. had the lowest; <em>Rhizopus</em> sp. consequently showed the highest generation time alongside the mixed culture of <em>Vibrio</em> sp. and <em>Acinetobacter </em>sp. while <em>Vibrio</em> had the lowest generation time. The results showed that while these pesticides are relatively biodegradable <em>in vitro</em>, they are only utilisable by a limited number of indigenous soil microorganisms.</p> Anwuli U Osadebe, Raphael Maduabum, Gideon C Okpokwasili ##submission.copyrightStatement## Tue, 27 Feb 2018 00:00:00 +0000 Determination of Cutoff of IgM ELISA for Diagnosis of Scrub typhus in Hilly Northern State of Himachal Pradesh <p>The aim of the study was to determine geographically relevant cutoffs for IgM ELISA in Himachal Pradesh. A total of 392 individuals including 292 patients of all age groups with clinically suspected scrub typhus and 100 healthy people were enrolled after taking a proper consent at Indira Gandhi Medical College, Shimla. An indirect ELISA that detects IgM antibodies to&nbsp;<em>Orientia tsutsugamushi</em>&nbsp;was performed in all serum samples. The serum samples from patients were subjected to IgM immunofluorescent antibody (IFA) (Fuller Laboratories, USA). A receiver operating characteristic (ROC) curve was drawn for ELISA to generate cutoff for the test. A total of 192 patients were found to be positive for scrub typhus. A set of 100 sera samples collected from healthy volunteers from Shimla were used to establish region specific cutoff for IgM ELISA. The cut off calculated from healthy volunteer was mean OD +3 standard deviation = 0.5. The ROC curve analysis of 392 participants revealed a cutoff-OD value of 0.46 with sensitivity and specificity of 91.7% and 99.5% respectively. Hence, a cutoff-OD value of 0.46 or 0.5 can be used as the cutoff for the diagnosis of scrub typhus for Himachal Pradesh based on our findings.</p> Anshu Gupta ##submission.copyrightStatement## Tue, 13 Feb 2018 00:00:00 +0000