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Giner-Llorca M, Locascio A, Del Real JA, Marcos JF, Manzanares P. Novel findings about the mode of action of the antifungal protein PeAfpA against Saccharomyces cerevisiae. Appl Microbiol Biotechnol 2023; 107:6811-6829. [PMID: 37688596 PMCID: PMC10589166 DOI: 10.1007/s00253-023-12749-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/13/2023] [Accepted: 08/24/2023] [Indexed: 09/11/2023]
Abstract
Antifungal proteins (AFPs) from filamentous fungi offer the potential to control fungal infections that threaten human health and food safety. AFPs exhibit broad antifungal spectra against harmful fungi, but limited knowledge of their killing mechanism hinders their potential applicability. PeAfpA from Penicillium expansum shows strong antifungal potency against plant and human fungal pathogens and stands above other AFPs for being active against the yeast Saccharomyces cerevisiae. We took advantage of this and used a model laboratory strain of S. cerevisiae to gain insight into the mode of action of PeAfpA by combining (i) transcriptional profiling, (ii) PeAfpA sensitivity analyses of deletion mutants available in the S. cerevisiae genomic deletion collection and (iii) cell biology studies using confocal microscopy. Results highlighted and confirmed the role of the yeast cell wall (CW) in the interaction with PeAfpA, which can be internalized through both energy-dependent and independent mechanisms. The combined results also suggest an active role of the CW integrity (CWI) pathway and the cAMP-PKA signalling in the PeAfpA killing mechanism. Besides, our studies revealed the involvement of phosphatidylinositol metabolism and the participation of ROX3, which codes for the subunit 19 of the RNA polymerase II mediator complex, in the yeast defence strategy. In conclusion, our study provides clues about both the killing mechanism of PeAfpA and the fungus defence strategies against the protein, suggesting also targets for the development of new antifungals. KEY POINTS: • PeAfpA is a cell-penetrating protein with inhibitory activity against S. cerevisiae. • The CW integrity (CWI) pathway is a key player in the PeAfpA killing mechanism. • Phosphatidylinositol metabolism and ROX3 are involved in the yeast defence strategy.
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Affiliation(s)
- Moisés Giner-Llorca
- Department of Food Biotechnology, Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Catedrático Agustín Escardino 7, Paterna, Valencia, 46980, Spain
| | - Antonella Locascio
- Department of Food Biotechnology, Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Catedrático Agustín Escardino 7, Paterna, Valencia, 46980, Spain
| | - Javier Alonso Del Real
- Department of Food Biotechnology, Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Catedrático Agustín Escardino 7, Paterna, Valencia, 46980, Spain
| | - Jose F Marcos
- Department of Food Biotechnology, Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Catedrático Agustín Escardino 7, Paterna, Valencia, 46980, Spain
| | - Paloma Manzanares
- Department of Food Biotechnology, Instituto de Agroquímica y Tecnología de Alimentos (IATA), Consejo Superior de Investigaciones Científicas (CSIC), Catedrático Agustín Escardino 7, Paterna, Valencia, 46980, Spain.
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2
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Andreu C, Del Olmo ML. Biotechnological applications of biofilms formed by osmotolerant and halotolerant yeasts. Appl Microbiol Biotechnol 2023:10.1007/s00253-023-12589-y. [PMID: 37233754 DOI: 10.1007/s00253-023-12589-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 05/08/2023] [Accepted: 05/10/2023] [Indexed: 05/27/2023]
Abstract
Many microorganisms are capable of developing biofilms under adverse conditions usually related to nutrient limitation. They are complex structures in which cells (in many cases of different species) are embedded in the material that they secrete, the extracellular matrix (ECM), which is composed of proteins, carbohydrates, lipids, and nucleic acids. The ECM has several functions including adhesion, cellular communication, nutrient distribution, and increased community resistance, this being the main drawback when these microorganisms are pathogenic. However, these structures have also proven useful in many biotechnological applications. Until now, the most interest shown in these regards has focused on bacterial biofilms, and the literature describing yeast biofilms is scarce, except for pathological strains. Oceans and other saline reservoirs are full of microorganisms adapted to extreme conditions, and the discovery and knowledge of their properties can be very interesting to explore new uses. Halotolerant and osmotolerant biofilm-forming yeasts have been employed for many years in the food and wine industry, with very few applications in other areas. The experience gained in bioremediation, food production and biocatalysis with bacterial biofilms can be inspiring to find new uses for halotolerant yeast biofilms. In this review, we focus on the biofilms formed by halotolerant and osmotolerant yeasts such as those belonging to Candida, Saccharomyces flor yeasts, Schwannyomyces or Debaryomyces, and their actual or potential biotechnological applications. KEY POINTS: • Biofilm formation by halotolerant and osmotolerant yeasts is reviewed. • Yeasts biofilms have been widely used in food and wine production. • The use of bacterial biofilms in bioremediation can be expanded to halotolerant yeast counterparts.
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Affiliation(s)
- Cecilia Andreu
- Departament de Química Orgànica, Facultat de Farmàcia, Universitat de València, Vicent Andrés Estellés S/N, 46100, València, Burjassot, Spain
| | - Marcel Lí Del Olmo
- Departament de Bioquímica i Biologia Molecular, Facultat de Biologia, Universitat de València, Dr. Moliner 50, 46100, València, Burjassot, Spain.
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Zara G, Budroni M, Mannazzu I, Fancello F, Zara S. Yeast biofilm in food realms: occurrence and control. World J Microbiol Biotechnol 2020; 36:134. [PMID: 32776210 PMCID: PMC7415760 DOI: 10.1007/s11274-020-02911-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 08/04/2020] [Indexed: 12/20/2022]
Abstract
In natural environments, microorganisms form microbial aggregates called biofilms able to adhere to a multitude of different surfaces. Yeasts make no exception to this rule, being able to form biofilms in a plethora of environmental niches. In food realms, yeast biofilms may cause major problems due to their alterative activities. In addition, yeast biofilms are tenacious structures difficult to eradicate or treat with the current arsenal of antifungal agents. Thus, much effort is being made to develop novel approaches to prevent and disrupt yeast biofilms, for example through the use of natural antimicrobials or small molecules with both inhibiting and dispersing properties. The aim of this review is to provide a synopsis of the most recent literature on yeast biofilms regarding: (i) biofilm formation mechanisms; (ii) occurrence in food and in food-related environments; and (iii) inhibition and dispersal using natural compounds, in particular.
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Affiliation(s)
- Giacomo Zara
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy.
| | - Marilena Budroni
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy
| | - Ilaria Mannazzu
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy
| | - Francesco Fancello
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy
| | - Severino Zara
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy.
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4
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Zara G, Bou Zeidan M, Fancello F, Sanna ML, Mannazzu I, Budroni M, Zara S. The administration of L-cysteine and L-arginine inhibits biofilm formation in wild-type biofilm-forming yeast by modulating FLO11 gene expression. Appl Microbiol Biotechnol 2019; 103:7675-7685. [PMID: 31300852 DOI: 10.1007/s00253-019-09996-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 06/17/2019] [Accepted: 06/22/2019] [Indexed: 01/25/2023]
Abstract
Microbial biofilms are undesired in food manufacturing, drinking water distribution systems, and clinical realms. Yeast biofilms are particularly problematic because of the strong capacity of yeast cells to adhere to abiotic surfaces, cells, and tissues. Novel approaches have been developed over recent years to prevent the establishment of microbial biofilms, such as through the use of small molecules with inhibiting and dispersing properties. Here, we studied the inhibitory activity of 11 different amino acids on the biofilm formation ability of three wild-type Saccharomyces cerevisiae strains and the reference strain ∑1278b. Subsequent evaluation of different concentrations of the two most effective amino acids, namely, arginine and cysteine, revealed that they acted in different ways. Arginine prevented biofilm formation by reducing FLO11 gene expression; its addition did not affect cell viability and was even found to enhance cell metabolism (vitality marker) as determined by phenotype microarray (PM) analysis. On the contrary, the addition of cysteine reduced both cell viability and vitality as well as FLO11 expression. Thus, the use of cysteine and arginine as agents against biofilm formation can be diversified depending on the most desired action towards yeast growth.
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Affiliation(s)
- Giacomo Zara
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy.
| | - Marc Bou Zeidan
- Department of Agri-Food Sciences, Holy Spirit University of Kaslik, Jounieh, Lebanon
| | - Francesco Fancello
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy
| | - Maria Lina Sanna
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy
| | - Ilaria Mannazzu
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy
| | - Marilena Budroni
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy
| | - Severino Zara
- Department of Agricultural Sciences, University of Sassari, Sassari, Italy.
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5
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Going with the Flo: The Role of Flo11-Dependent and Independent Interactions in Yeast Mat Formation. J Fungi (Basel) 2018; 4:jof4040132. [PMID: 30544497 PMCID: PMC6308949 DOI: 10.3390/jof4040132] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 11/23/2018] [Accepted: 11/29/2018] [Indexed: 01/20/2023] Open
Abstract
Strains of the bakers’ yeast Saccharomyces cerevisiae that are able to generate a multicellular structure called a mat on low percentage (0.3%) agar plates are given a selective advantage over strains that cannot exhibit this phenotype. This environment may exhibit some similarities to the rotting fruit on which S. cerevisiae often grows in nature. Mat formation occurs when the cells spread over the plate as they grow, and cells in the center of the biofilm aggregate to form multicellular structures that resemble a floral pattern. This multicellular behavior is dependent on the cell surface flocculin Flo11. This review covers recent information on the structure of Flo11 and how this likely impacts mat formation as well as how variegated expression of Flo11 influences mat formation. Finally, it also discusses several Flo11-independent genetic factors that control mat formation, such as vacuolar protein sorting (VPS) genes, cell wall signaling components, and heat shock proteins.
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Coi AL, Legras JL, Zara G, Dequin S, Budroni M. A set of haploid strains available for genetic studies ofSaccharomyces cerevisiaeflor yeasts. FEMS Yeast Res 2016; 16:fow066. [DOI: 10.1093/femsyr/fow066] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/08/2016] [Indexed: 12/20/2022] Open
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Legras JL, Moreno-Garcia J, Zara S, Zara G, Garcia-Martinez T, Mauricio JC, Mannazzu I, Coi AL, Bou Zeidan M, Dequin S, Moreno J, Budroni M. Flor Yeast: New Perspectives Beyond Wine Aging. Front Microbiol 2016; 7:503. [PMID: 27148192 PMCID: PMC4830823 DOI: 10.3389/fmicb.2016.00503] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 03/29/2016] [Indexed: 11/24/2022] Open
Abstract
The most important dogma in white-wine production is the preservation of the wine aroma and the limitation of the oxidative action of oxygen. In contrast, the aging of Sherry and Sherry-like wines is an aerobic process that depends on the oxidative activity of flor strains of Saccharomyces cerevisiae. Under depletion of nitrogen and fermentable carbon sources, these yeast produce aggregates of floating cells and form an air–liquid biofilm on the wine surface, which is also known as velum or flor. This behavior is due to genetic and metabolic peculiarities that differentiate flor yeast from other wine yeast. This review will focus first on the most updated data obtained through the analysis of flor yeast with -omic tools. Comparative genomics, proteomics, and metabolomics of flor and wine yeast strains are shedding new light on several features of these special yeast, and in particular, they have revealed the extent of proteome remodeling imposed by the biofilm life-style. Finally, new insights in terms of promotion and inhibition of biofilm formation through small molecules, amino acids, and di/tri-peptides, and novel possibilities for the exploitation of biofilm immobilization within a fungal hyphae framework, will be discussed.
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Affiliation(s)
- Jean-Luc Legras
- SPO, Institut National de la Recherche Agronomique - SupAgro, Université de Montpellier Montpellier, France
| | - Jaime Moreno-Garcia
- Department of Microbiology, Agrifood Campus of International Excellence ceiA3, University of Cordoba Cordoba, Spain
| | - Severino Zara
- Department of Agricultural Sciences, University of Sassari Sassari, Italy
| | - Giacomo Zara
- Department of Agricultural Sciences, University of Sassari Sassari, Italy
| | - Teresa Garcia-Martinez
- Department of Microbiology, Agrifood Campus of International Excellence ceiA3, University of Cordoba Cordoba, Spain
| | - Juan C Mauricio
- Department of Microbiology, Agrifood Campus of International Excellence ceiA3, University of Cordoba Cordoba, Spain
| | - Ilaria Mannazzu
- Department of Agricultural Sciences, University of Sassari Sassari, Italy
| | - Anna L Coi
- Department of Agricultural Sciences, University of Sassari Sassari, Italy
| | - Marc Bou Zeidan
- Department of Agri-Food Sciences, Holy Spirit University of Kaslik Jounieh, Lebanon
| | - Sylvie Dequin
- SPO, Institut National de la Recherche Agronomique - SupAgro, Université de Montpellier Montpellier, France
| | - Juan Moreno
- Department of Agricultural Chemistry, Agrifood Campus of International Excellence ceiA3, University of Cordoba Cordoba, Spain
| | - Marilena Budroni
- Department of Agricultural Sciences, University of Sassari Sassari, Italy
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Harries E, Gandía M, Carmona L, Marcos JF. The Penicillium digitatum protein O-mannosyltransferase Pmt2 is required for cell wall integrity, conidiogenesis, virulence and sensitivity to the antifungal peptide PAF26. MOLECULAR PLANT PATHOLOGY 2015; 16:748-761. [PMID: 25640475 PMCID: PMC6638402 DOI: 10.1111/mpp.12232] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The activity of protein O-mannosyltransferases (Pmts) affects the morphogenesis and virulence of fungal pathogens. Recently, PMT genes have been shown to determine the sensitivity of Saccharomyces cerevisiae to the antifungal peptide PAF26. This study reports the identification and characterization of the three Pdpmt genes in the citrus post-harvest pathogen Penicillium digitatum. The Pdpmt genes are expressed during fungal growth and fruit infection, with the highest induction for Pdpmt2. Pdpmt2 complemented the growth defect of the S. cerevisiae Δpmt2 strain. The Pdpmt2 gene mutation in P. digitatum caused pleiotropic effects, including a reduction in fungal growth and virulence, whereas its constitutive expression had no phenotypic effect. The Pdpmt2 null mutants also showed a distinctive colourless phenotype with a strong reduction in the number of conidia, which was associated with severe alterations in the development of conidiophores. Additional effects of the Pdpmt2 mutation were hyphal morphological alterations, increased sensitivity to cell wall-interfering compounds and a blockage of invasive growth. In contrast, the Pdpmt2 mutation increased tolerance to oxidative stress and to the antifungal activity of PAF26. These data confirm the role of protein O-glycosylation in the PAF26-mediated antifungal mechanism present in distantly related fungal species. Important to future crop protection strategies, this study demonstrates that a mutation rendering fungi more resistant to an antifungal peptide results in severe deleterious effects on fungal growth and virulence.
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Affiliation(s)
- Eleonora Harries
- Departamento de Ciencia de los Alimentos, Instituto de Agroquímica y Tecnología de Alimentos (IATA), CSIC, Avda, Agustín Escardino-7, Paterna, 46980, Valencia, Spain
| | - Mónica Gandía
- Departamento de Ciencia de los Alimentos, Instituto de Agroquímica y Tecnología de Alimentos (IATA), CSIC, Avda, Agustín Escardino-7, Paterna, 46980, Valencia, Spain
| | - Lourdes Carmona
- Departamento de Ciencia de los Alimentos, Instituto de Agroquímica y Tecnología de Alimentos (IATA), CSIC, Avda, Agustín Escardino-7, Paterna, 46980, Valencia, Spain
| | - Jose F Marcos
- Departamento de Ciencia de los Alimentos, Instituto de Agroquímica y Tecnología de Alimentos (IATA), CSIC, Avda, Agustín Escardino-7, Paterna, 46980, Valencia, Spain
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9
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Kraushaar T, Brückner S, Veelders M, Rhinow D, Schreiner F, Birke R, Pagenstecher A, Mösch HU, Essen LO. Interactions by the Fungal Flo11 Adhesin Depend on a Fibronectin Type III-like Adhesin Domain Girdled by Aromatic Bands. Structure 2015; 23:1005-17. [DOI: 10.1016/j.str.2015.03.021] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 03/06/2015] [Accepted: 03/25/2015] [Indexed: 12/23/2022]
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Concatemerization increases the inhibitory activity of short, cell-penetrating, cationic and tryptophan-rich antifungal peptides. Appl Microbiol Biotechnol 2015; 99:8011-21. [PMID: 25846331 DOI: 10.1007/s00253-015-6541-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 03/05/2015] [Accepted: 03/09/2015] [Indexed: 01/05/2023]
Abstract
There are short cationic and tryptophan-rich antifungal peptides such as the hexapeptide PAF26 (RKKWFW) that have selective toxicity and cell penetration properties against fungal cells. This study demonstrates that concatemeric peptides with tandem repeats of the heptapeptide PAF54 (which is an elongated PAF26 sequence) show increased fungistatic and bacteriostatic activities while maintaining the absence of hemolytic activity of the monomer. The increase in antimicrobial activity of the double-repeated PAF sequences (diPAFs), compared to the nonrepeated PAF, was higher (4-8-fold) than that seen for the triple-repeated sequences (triPAFs) versus the diPAFs (2-fold). However, concatemerization diminished the fungicidal activity against quiescent spores of the filamentous fungus Penicillium digitatum. Peptide solubility and sensitivity to proteolytic degradation were affected by the design of the concatemers: incorporation of the AGPA sequence hinge to separate PAF54 repeats increased solubility while the C-terminal addition of the KDEL sequence decreased in vitro stability. These results led to the design of the triPAF sequence PAF102 of 30 amino acid residues, with increased antimicrobial activity and minimal inhibitory concentration (MIC) value of 1-5 μM depending on the fungus. Further characterization of the mode-of-action of PAF102 demonstrated that it colocalizes first with the fungal cell wall, it is thereafter internalized in an energy dependent manner into hyphal cells of the filamentous fungus Fusarium proliferatum, and finally kills hyphal cells intracellularly. Therefore, PAF102 showed mechanistic properties against fungi similar to the parental PAF26. These observations are of high interest in the future development of PAF-based antimicrobial molecules optimized for their production in biofactories.
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Bou Zeidan M, Zara G, Viti C, Decorosi F, Mannazzu I, Budroni M, Giovannetti L, Zara S. L-histidine inhibits biofilm formation and FLO11-associated phenotypes in Saccharomyces cerevisiae flor yeasts. PLoS One 2014; 9:e112141. [PMID: 25369456 PMCID: PMC4219837 DOI: 10.1371/journal.pone.0112141] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 09/18/2014] [Indexed: 11/19/2022] Open
Abstract
Flor yeasts of Saccharomyces cerevisiae have an innate diversity of Flo11p which codes for a highly hydrophobic and anionic cell-wall glycoprotein with a fundamental role in biofilm formation. In this study, 380 nitrogen compounds were administered to three S. cerevisiae flor strains handling Flo11p alleles with different expression levels. S. cerevisiae strain S288c was used as the reference strain as it cannot produce Flo11p. The flor strains generally metabolized amino acids and dipeptides as the sole nitrogen source, although with some exceptions regarding L-histidine and histidine containing dipeptides. L-histidine completely inhibited growth and its effect on viability was inversely related to Flo11p expression. Accordingly, L-histidine did not affect the viability of the Δflo11 and S288c strains. Also, L-histidine dramatically decreased air-liquid biofilm formation and adhesion to polystyrene of the flor yeasts with no effect on the transcription level of the Flo11p gene. Moreover, L-histidine modified the chitin and glycans content on the cell-wall of flor yeasts. These findings reveal a novel biological activity of L-histidine in controlling the multicellular behavior of yeasts [corrected].
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Affiliation(s)
- Marc Bou Zeidan
- Dipartimento di Agraria, University of Sassari, Sassari, Italy
| | - Giacomo Zara
- Dipartimento di Agraria, University of Sassari, Sassari, Italy
| | - Carlo Viti
- Dipartimento di Scienze delle Produzioni Agroalimentari e dell'Ambiente, University of Florence, Firenze, Italy
| | - Francesca Decorosi
- Dipartimento di Scienze delle Produzioni Agroalimentari e dell'Ambiente, University of Florence, Firenze, Italy
| | - Ilaria Mannazzu
- Dipartimento di Agraria, University of Sassari, Sassari, Italy
| | | | - Luciana Giovannetti
- Dipartimento di Scienze delle Produzioni Agroalimentari e dell'Ambiente, University of Florence, Firenze, Italy
| | - Severino Zara
- Dipartimento di Agraria, University of Sassari, Sassari, Italy
- * E-mail:
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Harries E, Carmona L, Muñoz A, Ibeas JI, Read ND, Gandía M, Marcos JF. Genes involved in protein glycosylation determine the activity and cell internalization of the antifungal peptide PAF26 in Saccharomyces cerevisiae. Fungal Genet Biol 2013; 58-59:105-15. [DOI: 10.1016/j.fgb.2013.08.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 07/29/2013] [Accepted: 08/02/2013] [Indexed: 12/22/2022]
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