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Soil microbiology

Luisa F Gómez, Isaura P Torres, María Del P Jiménez, Juan G McEwen, Catalina de Bedout, Carlos A Peláez, José M Acevedo, María L Taylor, Myrtha Arango
Histoplasma capsulatum is the causative agent of histoplasmosis and this fungus inhabits soils rich in phosphorus and nitrogen that are enriched with bird and bat manure. The replacement of organic matter in agroecosystems is necessary in the tropics, and the use of organic fertilizers has increased. Cases and outbreaks due to the presence of the fungus in these components have been reported. The Instituto Colombiano Agropecuario resolution 150 of 2003 contains the parameters set by the Colombian Technical Standard (NTC 5167) on the physicochemical and microbiological features of fertilizers, but it does not regulate the search for H...
March 12, 2018: American Journal of Tropical Medicine and Hygiene
Oluwadara Oluwaseun Alegbeleye, Ian Singleton, Anderson S Sant'Ana
Foodborne illness resulting from the consumption of contaminated fresh produce is a common phenomenon and has severe effects on human health together with severe economic and social impacts. The implications of foodborne diseases associated with fresh produce have urged research into the numerous ways and mechanisms through which pathogens may gain access to produce, thereby compromising microbiological safety. This review provides a background on the various sources and pathways through which pathogenic bacteria contaminate fresh produce; the survival and proliferation of pathogens on fresh produce while growing and potential methods to reduce microbial contamination before harvest...
August 2018: Food Microbiology
David S Pal, Rajan Tripathee, Matthew C Reid, Karina V R Schäfer, Peter R Jaffé
Biogeochemical processes in wetland soils are complex and are driven by a microbiological community that competes for resources and affects the soil chemistry. Depending on the availability of various electron acceptors, the high carbon input to wetland soils can make them important sources of methane production and emissions. There are two significant pathways for methanogenesis: acetoclastic and hydrogenotrophic methanogenesis. The hydrogenotrophic pathway is dependent on the availability of dissolved hydrogen gas (H2 ), and there is significant competition for available H2 ...
February 26, 2018: Environmental Monitoring and Assessment
Adriano Sofo, Hazem S Elshafie, Antonio Scopa, Stefania M Mang, Ippolito Camele
The growing of microbial resistance leads to a great interest about some natural alternatives to synthetic compounds. This study was carried out in two olive orchards (Olea europaea L., cv. Coratina) South Italy (Basilicata region), one located in a polluted area near a fertilizers factory releasing Zn and the other in a control unpolluted site, both managed with similar cultivation techniques. Olive oil samples were studied from both areas during 2014 and 2015. The soil microbiological status of the polluted and unpolluted orchards has been characterized and the antimicrobial effects of olive oils extracted from polluted plants (PP) and control plants (CP) against some phytopathogens have been explored...
February 19, 2018: Journal of Trace Elements in Medicine and Biology
Edyta Hewelke, Jan Szatyłowicz, Piotr Hewelke, Tomasz Gnatowski, Rufat Aghalarov
The contamination of soil with petroleum products is a major environmental problem. Petroleum products are common soil contaminants as a result of human activities, and they are causing substantial changes in the biological (particularly microbiological) processes, chemical composition, structure and physical properties of soil. The main objective of this study was to assess the impact of soil moisture on CO2 efflux from diesel-contaminated albic podzol soils. Two contamination treatments (3000 and 9000 mg of diesel oil per kg of soil) were prepared for four horizons from two forest study sites with different initial levels of soil water repellency...
2018: Water, Air, and Soil Pollution
L Simon, L Gastaud, D Martiano, C Bailleux, L Hasseine, M Gari-Toussaint
Endophthalmitis is a rare infection of the vitreous and/or aqueous. It can be bacterial or fungal. Exogenous endophthalmitis is the most common form and results from direct inoculation of a pathogen after eye surgery or penetrating trauma. Endophthalmitis can also be endogenous, secondary to disseminated infection. Fungal endophthalmitis is associated with poor prognosis and treatment is difficult given the low penetration of most of the antifungal agents available and the emergence of resistant filamentous fungi like Fusarium...
February 21, 2018: Journal de Mycologie Médicale
Angela Martinez-Perez, Silvia Roure Díez, Moncef Belhasen-Garcia, Diego Torrús-Tendero, Jose Luis Perez-Arellano, Teresa Cabezas, Cristina Soler, Marta Díaz-Menéndez, Miriam Navarro, Begoña Treviño, Fernando Salvador-Vélez
INTRODUCTION: Strongyloides stercoralis is a globally distributed nematode that causes diverse clinical symptoms in humans. Spain, once considered an endemic country, has experienced a recent increase in imported cases. The introduction of serology helps diagnosis and is currently replacing microbiological techniques in some settings, but its sensitivity is variable and can be low in immunocompromised patients. Diagnosis can only be confirmed by identification of larvae. Often, this "gold standard" can only be achieved in severe cases, such as disseminated S...
February 23, 2018: PLoS Neglected Tropical Diseases
Mónika Knáb, Tibor Szili-Kovács, Károly Márialigeti, János Móga, Andrea K Borsodi
Karst areas have great environmental importance as sources of subsurface water and often maintain very sensitive ecosystems. In recent years, increasing number of microbiological studies focused on the bacterial communities of karst soils. In this study, diversity examinations on two distinct Hungarian karst areas, Aggtelek and Tapolca, were performed using parallel cultivation and molecular cloning methods. The phylogenetic affiliation of bacterial strains and molecular clones was determined based on their 16S rRNA gene sequences...
February 23, 2018: Acta Microbiologica et Immunologica Hungarica
Zhi-Neng Hong, Jun Jiang, Jiu-Yu Li, Ren-Kou Xu
Adhesion of bacteria onto minerals is a ubiquitous process that plays a central role in many biogeochemical, microbiology and environmental processes in soil and sediment. Although bacterial adhesion onto soil minerals such as phyllosilicates and Fe-oxides have been investigated extensively, little is known about the mechanisms for bacterial attachment onto Al-oxides. Here, we explored the adhesion of Bacillus subtilis onto gibbsite (γ-AlOOH) under various ionic strengths (1, 10, 50, and 100 mM NaCl) and pHs (pH 4, 7, and 9) by in-situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy...
February 13, 2018: Colloids and Surfaces. B, Biointerfaces
Oriol Baltrons, Montserrat López-Mesas, Mercè Vilaseca, Carmen Gutiérrez-Bouzán, Franck Le Derf, Florence Portet-Koltalo, Cristina Palet
In order to assess the effect of mixed pollutants, the influence of different concentration levels of a mixture of metals (Cr, Co, Pb, Mn, Ni, Cu, Zn) on the biodegradation of some PAHs (phenanthrene, fluoranthene, pyrene, benzo[b]fluoranthene and benzo[a]pyrene) in soil samples was evaluated. To do so, groups of microcosms of a natural soil from the region of Sabadell (Barcelona, Spain) were prepared as a reproduction of the native environment at laboratory scale, under controlled conditions. Mixtures of PAHs and metals were carefully selected, according to soil characterization and microbiological growth preliminary assays, and were added to microcosms...
February 9, 2018: Science of the Total Environment
Motharasan Manogaran, Mohd Yunus Shukor, Nur Adeela Yasid, Khalilah Abdul Khalil, Siti Aqlima Ahmad
The herbicide glyphosate is often used to control weeds in agricultural lands. However, despite its ability to effectively kill weeds at low cost, health problems are still reported due to its toxicity level. The removal of glyphosate from the environment is usually done by microbiological process since chemical process of degradation is ineffective due to the presence of highly stable bonds. Therefore, finding glyphosate-degrading microorganisms in the soil of interest is crucial to remediate this glyphosate...
February 2018: 3 Biotech
Andrea Du Toit
No abstract text is available yet for this article.
February 12, 2018: Nature Reviews. Microbiology
Daniel Wright, Erik Feibert, Stuart Reitz, Clint Shock, Joy Waite-Cusic
The Produce Safety Rule of the U.S. Food Safety Modernization Act includes restrictions on the use of agricultural water of poor microbiological quality. Mitigation options for poor water quality include the application of an irrigation-to-harvest interval of <4 days; however, dry bulb onion production includes an extended irrigation-to-harvest interval (<30 days). This study evaluated conventional curing practices for mitigating Escherichia coli contamination in a field setting. Well water inoculated with rifampin-resistant E...
February 7, 2018: Journal of Food Protection
Ryan P Bartelme, Ben O Oyserman, Jesse E Blom, Osvaldo J Sepulveda-Villet, Ryan J Newton
As the processes facilitated by plant growth promoting microorganisms (PGPMs) become better characterized, it is evident that PGPMs may be critical for successful sustainable agricultural practices. Microbes enrich plant growth through various mechanisms, such as enhancing resistance to disease and drought, producing beneficial molecules, and supplying nutrients and trace metals to the plant rhizosphere. Previous studies of PGPMs have focused primarily on soil-based crops. In contrast, aquaponics is a water-based agricultural system, in which production relies upon internal nutrient recycling to co-cultivate plants with fish...
2018: Frontiers in Microbiology
Taylor K Dunivin, Justine Miller, Ashley Shade
Arsenic (As), a toxic element, has impacted life since early Earth. Thus, microorganisms have evolved many As resistance and tolerance mechanisms to improve their survival outcomes given As exposure. We isolated As resistant bacteria from Centralia, PA, the site of an underground coal seam fire that has been burning since 1962. From a 57.4°C soil collected from a vent above the fire, we isolated 25 unique aerobic As resistant bacterial strains spanning seven genera. We examined their diversity, resistance gene content, transformation abilities, inhibitory concentrations, and growth phenotypes...
2018: PloS One
Daniel Bravo, Sergio Pardo-Díaz, Javier Benavides-Erazo, Gersain Rengifo-Estrada, Olivier Braissant, Clara Leon-Moreno
AIMS: This research aims to assess total-cadmium soil content and microbiological aspects to understand the dynamics of culturable cadmium-tolerant bacteria (CdtB) in cacao soils from northeastern Colombia. METHODS AND RESULTS: An integration of inverted dish plating, Cd determination and a microcalorimetry assay (IMC) was carried out. A farm in Boyacá showed the highest level of total soil Cd (3.74 mg kg-1 ) followed by farms in Santander and Arauca (2.76 and 1...
January 18, 2018: Journal of Applied Microbiology
Liying Wang, Li Ye, Yaqin Yu, Chuanyong Jing
Anaerobic microbiological antimonate [Sb(V)] respiration is a newly discovered process regulating the Sb redox transformation in soils. However, little is known about the role microbiological Sb(V) respiration plays in the fate of Sb in the subsurface, especially in the presence of sulfate and electron shuttles. Herein, we successfully enriched a Sb(V) reducing microbiota (SbRM) from the subsurface near an active Sb mine. SbRM was dominated by genus Alkaliphilus (18-36%), Clostridiaceae (17-18%), Tissierella (24-27%), and Lysinibacillus (16-37%)...
January 9, 2018: Environmental Science & Technology
M V Schelchkova, S P Davydov, D G Fyodorov-Davydov, A I Davydova, G G Boeskorov, N G Solomonov
Microbiological and enzyme activities of extrazonal taiga-steppe soils in the lower reaches of the Kolyma River have been studied for the first time. Contrary to north-taiga cryometamorphic soils, predominating in the area, microbial cenoses under herb-sedge petrophytic and grass-sagebrush-herb thermophytic steppes are characterized by features typical for arid soils. The saturation of the soil profile with microorganisms is greater, and the development of actinomycetes is more intensive. The enzyme complex is characterized by high activity of dehydrogenases...
November 2017: Doklady Biological Sciences: Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections
Edyta Boros-Lajszner, Jadwiga Wyszkowska, Jan Kucharski
Nickel is a heavy metal which is a stable soil pollutant which is difficult to remediate. An attempt to reduce its impact on the environment can be made by changing its solubility. The right level of hydrogen ions and the content of mineral and organic colloids are crucial in this regard. Therefore, methods to neutralise heavy metals in soil are sought. There are no reports in the literature on the possibility of using minerals in the detoxication of a soil environment contaminated with metals. It is important to fill the gap in research on the effect of zeolites on the microbiological, biochemical and physicochemical properties of soils under pressure from heavy metals...
December 30, 2017: Environmental Monitoring and Assessment
Eva Högfors-Rönnholm, Stephan Christel, Krister Dalhem, Tom Lillhonga, Sten Engblom, Peter Österholm, Mark Dopson
Naturally occurring sulfide rich deposits are common along the northern Baltic Sea coast that when exposed to air, release large amounts of acid and metals into receiving water bodies. This causes severe environmental implications for agriculture, forestry, and building of infrastructure. In this study, we investigated the efficiency of ultrafine-grained calcium carbonate and peat (both separately and in combination) to mitigate acid and metal release. The experiments were carried out aerobically that mimicked summer conditions when the groundwater level is low and acid sulfate soils are exposed to oxygen, and anaerobically that is similar to autumn to spring conditions...
December 26, 2017: Science of the Total Environment
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