Mycological research最新文献

{"title":"Development and use of quantitative competitive PCR assays for relative quantifying rumen anaerobic fungal populations in both in vitro and in vivo systems","authors":"Mohammad H. Sekhavati ,&nbsp;Mohsen Danesh Mesgaran ,&nbsp;Mohammad R. Nassiri ,&nbsp;Tahereh Mohammadabadi ,&nbsp;Farkhondeh Rezaii ,&nbsp;Adham Fani Maleki","doi":"10.1016/j.mycres.2009.07.017","DOIUrl":"10.1016/j.mycres.2009.07.017","url":null,"abstract":"<div><p>This paper describes the use of a quantitative competitive polymerase chain reaction (QC-PCR) assay; using PCR primers to the rRNA locus of rumen fungi and a standard-control DNA including design and validation. In order to test the efficiency of this method for quantifying anaerobic rumen fungi, it has been attempted to evaluate this method in <em>in vitro</em> conditions by comparing with an assay based on measuring cell wall chitin. The changes in fungal growth have been studied when they are grown in <em>in vitro</em> on either untreated (US) or sodium hydroxide treated wheat straw (TS). Results showed that rumen fungi growth was significantly higher in treated samples compared with untreated during the 12<!--> <!-->d incubation (<em>P</em> <!-->&lt;<!--> <!-->0.05) and plotting the chitin assay's results against the competitive PCR's showed high positive correlation (<em>R</em>² <!-->≥<!--> <!-->0.87). The low mean values of the coefficients of variance in repeatability in the QC-PCR method against the chitin assay demonstrated more reliability of this new approach. And finally, the efficiency of this method was investigated in <em>in vivo</em> conditions. Samples of rumen fluid were collected from four fistulated Holstein steers which were fed four different diets (basal diet, high starch, high sucrose and starch plus sucrose) in rotation. The results of QC-PCR showed that addition of these non-structural carbohydrates to the basal diets caused a significant decrease in rumen anaerobic fungi biomass. The QC-PCR method appears to be a reliable and can be used for rumen samples.</p></div>","PeriodicalId":19045,"journal":{"name":"Mycological research","volume":"113 10","pages":"Pages 1146-1153"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mycres.2009.07.017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40003893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Do Sebacinales commonly associate with plant roots as endophytes?","authors":"Marc-André Selosse ,&nbsp;Marie-Pierre Dubois ,&nbsp;Nadir Alvarez","doi":"10.1016/j.mycres.2009.07.004","DOIUrl":"10.1016/j.mycres.2009.07.004","url":null,"abstract":"<div><p>Sebacinales are basal Hymenomycetes with diverse mycorrhizal abilities, ranging from ectomycorrhizae to ericoid and orchid mycorrhizae. Several previous PCR or isolation works raised the possibility that Sebacinales are endophytes in plant roots. We tested this hypothesis in an isolation-independent approach by using specific PCR primers for ribosomal DNA of Sebacinales on AM mycorrhizal or non-mycorrhizal roots. Thirty-nine plant species were sampled on a Caribbean and two European sites (3 repetition per species and site), covering 25 families in monocots and eudicots. PCR signals were obtained from 40 samples (28.9<!--> <!-->%) from 27 species (69.2<!--> <!-->%) and all sites. Whenever sequencing was successful, a sequence belonging to Sebacinales was recovered. A phylogenetic approach revealed that 13 of them belonged to clade B (encompassing ericoid and orchid mycorrhizal species) and 4 to clade A (usually encompassing only ectomycorrhizal species). These data suggest that Sebacinales may be endophytic in many angiosperm roots, and that this condition is plesiomorphic in Sebacinales. They bridge the gap between physiological studies, inoculating Sebacinales (<em>Piriformospora indica</em> or <em>Sebacina vermifera</em>) on diverse plants and molecular ecology, hitherto restricting Sebacinales to mycorrhizal interactions. Structural and functional aspects of the interaction deserve further studies.</p></div>","PeriodicalId":19045,"journal":{"name":"Mycological research","volume":"113 10","pages":"Pages 1062-1069"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mycres.2009.07.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28314022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genetic diversity of Labyrinthula terrestris, a newly emergent plant pathogen, and the discovery of new Labyrinthulid organisms","authors":"Greg W. Douhan ,&nbsp;Mary W. Olsen ,&nbsp;Amanda Herrell ,&nbsp;Charles Winder ,&nbsp;Frank Wong ,&nbsp;Kate Entwistle","doi":"10.1016/j.mycres.2009.08.002","DOIUrl":"10.1016/j.mycres.2009.08.002","url":null,"abstract":"<div><p>Labyrinthuloid organisms are thought almost exclusively to be only associated with marine environments. However in 1995, a disease of turfgrass suddenly appeared that was eventually determined to be caused by a new <em>Labyrinthula</em> species (<em>Labyrinthula terrestris</em>). The disease is primarily thought to be caused by the use of elevated salinity irrigation water, making it a unique example of an emergent plant disease potentially induced by human activity. Our objective was to examine diversity of <em>L. terrestris</em> from broadly distributed isolates using AFLP, sequence analysis of two rDNA loci (SSU &amp; LSU-ITS), and pathogenicity tests since previous research on a limited number of isolates found no variability based in ITS and SSU. In contrast to previous work, 18 unique genotypes were found out of a total of 29 analyzed based on AFLP. Sequence variability was only found in a single pathogenic isolate (Laby 31) that was isolated from the United Kingdom. The divergence based on AFLP and sequence analysis suggests that this isolate is a distinct species but closely related to the other <em>L. terrestris</em> isolates examined. Two putatively new nonpathogenic Labyrinthulid species were also found (Laby 13 &amp; 32). Our results suggest that these organisms may be widely distributed in terrestrial environments based on the diversity found in this study and may have long been associated with terrestrial plants. Our results also suggest that more Labyrinthulid organisms may potentially emerge as new plant pathogens in the future if salinification of agricultural systems continues to increases worldwide.</p></div>","PeriodicalId":19045,"journal":{"name":"Mycological research","volume":"113 10","pages":"Pages 1192-1199"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mycres.2009.08.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28341312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Induced proteome of Trichoderma harzianum by Botrytis cinerea","authors":"Hsueh-Hui Yang ,&nbsp;Siwy Ling Yang ,&nbsp;Kou-Cheng Peng ,&nbsp;Chaur-Tsuen Lo ,&nbsp;Shu-Ying Liu","doi":"10.1016/j.mycres.2009.04.004","DOIUrl":"10.1016/j.mycres.2009.04.004","url":null,"abstract":"<div><p>As a notable biocontrol agent, <em>Trichoderma harzianum</em> can antagonize a diverse array of phytopathogenic fungi, including <em>Botrytis cinerea</em>, <em>Rhizoctonia solani</em> and <em>Fusarium oxysporum</em>. Elucidating the biocontrol mechanism of <em>T. harzianum</em> in response to the pathogens enables it to be exploited in the control of plant diseases. Two-dimensional gel electrophoresis (2-DE) was performed to obtain secreted protein patterns of <em>T. harzianum</em> ETS 323, grown in media that contained glucose, a mixture of glucose and deactivated <em>B. cinerea</em> mycelia, deactivated <em>B. cinerea</em> mycelia or deactivated <em>T. harzianum</em> mycelia. Selected protein spots were identified using liquid chromatography–tandem mass spectrometry (LC–MS/MS). Ninety one out of 100 excised protein spots were analyzed and some proteins were sequence identified. Of these, one <span>l</span>-amino acid oxidase (LAAO) and two endochitinases were uniquely induced in the media that contained deactivated <em>B. cinerea</em> mycelia as the sole carbon source. Activities of the cell wall-degrading enzymes (CWDEs), including β-1,3-glucanases, β-1,6-glucanases, chitinases, proteases and xylanases, were significantly higher in media with deactivated <em>B. cinerea</em> mycelia than in other media. This finding suggests that the cell wall of <em>B. cinerea</em> is indeed the primary target of <em>T. harzianum</em> ETS 323 in the biocontrol mechanism. The possible roles of LAAO and xylanase were also discussed.</p></div>","PeriodicalId":19045,"journal":{"name":"Mycological research","volume":"113 9","pages":"Pages 924-932"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mycres.2009.04.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28157860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cystobasidiopsis nirenbergiae, a new agaricostilbomycete (Pucciniomycotina)","authors":"Robert Bauer ,&nbsp;Berthold Metzler ,&nbsp;Dominik Begerow ,&nbsp;Franz Oberwinkler","doi":"10.1016/j.mycres.2009.05.003","DOIUrl":"10.1016/j.mycres.2009.05.003","url":null,"abstract":"<div><p>A new genus, <em>Cystobasidiopsis</em>, and a new species, <em>Cystobasidiopsis nirenbergiae</em>, are described for a fungus isolated from an arable loess soil in Ahlum near Braunschweig, Niedersachsen, Germany. An integrated analysis of morphological, ecological, ultrastructural and molecular data indicates that the new species belongs to the <em>Chionosphaeraceae</em> within the <em>Agaricostilbales</em>. Relevant characteristics of the new species are discussed and compared with those of related taxa.</p></div>","PeriodicalId":19045,"journal":{"name":"Mycological research","volume":"113 9","pages":"Pages 960-966"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mycres.2009.05.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28224994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diversity and distribution of fungal foliar endophytes in New Zealand Podocarpaceae","authors":"Sucheta Joshee ,&nbsp;Barbara C. Paulus ,&nbsp;Duckchul Park ,&nbsp;Peter R. Johnston","doi":"10.1016/j.mycres.2009.06.004","DOIUrl":"10.1016/j.mycres.2009.06.004","url":null,"abstract":"<div><p>The diversity and distribution of fungal endophytes in the leaves of four podocarps (<em>Dacrydium cupressinum</em>, <em>Prumnopitys ferruginea</em>, <em>Dacrycarpus dacrydioides</em>, and <em>Podocarpus totara</em>, all <em>Podocarpaceae</em>) and an angiosperm (<em>Kunzea ericoides</em>, <em>Myrtaceae</em>) occurring in close stands were studied. The effects of host species, locality, and season on endophyte assemblages were investigated. Host species was the major factor shaping endophyte assemblages. The spatial separation of sites and seasonal differences played significant but lesser roles. The mycobiota of each host species included both generalist and largely host-specialised fungi. The host-specialists were often observed at low frequencies on some of the other hosts. There was no clear evidence for family-level specialisation across the <em>Podocarpaceae</em>. Of the 17 species found at similar frequencies on several of the podocarp species, 15 were found also on <em>Kunzea</em>. Many of the endophytes isolated appear to represent species of fungi not previously recognised from New Zealand.</p></div>","PeriodicalId":19045,"journal":{"name":"Mycological research","volume":"113 9","pages":"Pages 1003-1015"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mycres.2009.06.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28253571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New fungal genera, Tectonidula gen. nov. for Calosphaeria-like fungi with holoblastic-denticulate conidiogenesis and Natantiella gen. nov. for three species segregated from Ceratostomella","authors":"Martina Réblová ,&nbsp;Václav Štěpánek","doi":"10.1016/j.mycres.2009.06.003","DOIUrl":"10.1016/j.mycres.2009.06.003","url":null,"abstract":"<div><p>Two morphologically similar groups of ascomycetes with globose to subglobose perithecia, elongate necks, unitunicate asci floating freely at maturity, and hyaline ascospores currently placed in <em>Calosphaeria s. lat.</em> and <em>Ceratostomella s. lat.</em>, respectively, are studied. The <em>Calosphaeria</em>-like fungi have groups of perithecia growing between cortex and wood, arranged in circular groups with converging necks and piercing the cortex in a common point; the asci with a shallow apical ring and U- to horseshoe-shaped hyaline ascospores are compared with <em>Calosphaeria pulchella</em>, the type species of the genus. Conidiogenesis of the investigated <em>Calosphaeria</em>-like fungi is holoblastic-denticulate; ramichloridium-like and sporothrix-like conidiophores and conidia were formed <em>in vitro</em>. Ascospore and ascus morphology, structure of the ascal apex, ascogenous system, mode of conidiogenesis and the large subunit rRNA sequences of this group differ considerably from <em>C. pulchella</em> and both groups are unrelated. Thus a new genus, <em>Tectonidula</em>, is described with two accepted species, <em>T. hippocrepida</em> and <em>T. fagi</em>; they are separated by ascospore and ascus morphology and holoblastic-denticulate conidiogenesis from the core species of <em>Calosphaeria</em>. The placement of <em>Tectonidula</em> among perithecial ascomycetes is discussed. The relationship of <em>Tectonidula</em> with <em>Barbatosphaeria</em> and two ramichloridium-like hyphomycetous genera <em>Rhodoveronaea</em> and <em>Myrmecridium</em> is investigated. Three species formerly attributed to <em>Ceratostomella</em> are studied. The revision of the herbarium type specimen and fresh material of <em>Ceratostomella ligneola</em> revealed that it is conspecific with <em>Ceratostomella ampullasca</em> and <em>Ceratostomella similis</em>. The LSU phylogeny clearly separated <em>C. ligneola</em> from <em>Ceratostomella s. str</em>. and morphologically similar <em>Lentomitella</em>. On the basis of molecular sequence data and detailed comparison of morphology of asci, ascospores and ascogenous system the genus <em>Natantiella</em> is described for <em>C. ligneola</em> with <em>C. ampullasca</em> and <em>C. similis</em> as its synonyms. <em>Natantiella</em> produced sterile mycelium <em>in vitro</em>.</p></div>","PeriodicalId":19045,"journal":{"name":"Mycological research","volume":"113 9","pages":"Pages 991-1002"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mycres.2009.06.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28255099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An optimized microsatellite marker set for detection of Metarhizium anisopliae genotype diversity on field and regional scales","authors":"Catherine Oulevey,&nbsp;Franco Widmer,&nbsp;Roland Kölliker,&nbsp;Jürg Enkerli","doi":"10.1016/j.mycres.2009.06.005","DOIUrl":"10.1016/j.mycres.2009.06.005","url":null,"abstract":"<div><p>Thirty-three <em>Metarhizium anisopliae</em> isolates sampled across Switzerland as well as 35 and 36 <em>M. anisopliae</em> isolates sampled from two field sites were assembled in three isolate collections. All isolates were analyzed using 27 newly developed and 14 previously published microsatellite markers. The 41 markers allowed for detection of 25 genotypes in the Swiss collection while 30 and 11 genotypes were detected in the two field collections. This indicated high genetic diversity on a regional as well as on a field scale. In order to improve genotyping efficiency, an optimized marker set, which allows discrimination of a large number of genotypes with as few markers as possible was developed. The optimized marker set consisted of 16 common markers, which provided resolution close to maximal resolution in all three collections (91–93 %). The results demonstrated that optimized marker sets have to be validated before large scale application to previously unassessed collections in order to avoid suboptimal resolution. This genetic tool will be valuable for analyses of genetic population structure of <em>M. anisopliae</em> in different habitats on a regional as well as on a field scale.</p></div>","PeriodicalId":19045,"journal":{"name":"Mycological research","volume":"113 9","pages":"Pages 1016-1024"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mycres.2009.06.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28254290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphological and phylogenetic analyses of Pythium species in South Africa","authors":"Adéle McLeod ,&nbsp;Wilhelm J. Botha ,&nbsp;Julia C. Meitz ,&nbsp;Chris F.J. Spies ,&nbsp;Yared T. Tewoldemedhin ,&nbsp;Lizel Mostert","doi":"10.1016/j.mycres.2009.04.009","DOIUrl":"10.1016/j.mycres.2009.04.009","url":null,"abstract":"<div><p>The genus <em>Pythium</em> is important in agriculture, since it contains many plant pathogenic species, as well as species that can promote plant growth and some that have biocontrol potential. In South Africa, very little is known about the diversity of <em>Pythium</em> species within agricultural soil, irrigation and hydroponic systems. Therefore, the aim of the study was to characterise a selection of 85 <em>Pythium</em> isolates collected in South Africa from 1991 through to 2007. The isolates were characterised morphologically as well as through sequence and phylogenetic analyses of the internal transcribed spacer regions (ITS) and the 5.8S gene of the nuclear ribosomal DNA. Phylogenetic analyses showed that the isolates represented ten of the 11 published <em>Pythium</em> clades [Lévesque &amp; De Cock, 2004. Molecular phylogeny and taxonomy of the genus <em>Pythium</em>. <em>Mycological Research</em> 108: 1363–1383]. Characterisation of isolates in clade D and J suggested that the phylogenetic concept of <em>Pythium acanthicum</em> and <em>Pythium perplexum</em> respectively, needs further investigation in order to enable reliable species identification within these clades. Our phylogenetic analyses of <em>Pythium</em> species in clade B also showed that species with globose sporangia group basal within this clade, and are not dispersed within the clade as previously reported. The 85 South African isolates represented 34 known species, of which 20 species have not been reported previously in South Africa. Additionally, three isolates (PPRI 8428, 8300 and 8418) were identified that may each represent putative new species, <em>Pythium</em> sp. WJB-1 to WJB-3.</p></div>","PeriodicalId":19045,"journal":{"name":"Mycological research","volume":"113 9","pages":"Pages 933-951"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mycres.2009.04.009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28192356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cytoskeleton and mitochondrial morphology of saprotrophs and the pathogen Heterobasidion annosum in the presence of Suillus bovinus metabolites","authors":"Joanna Mucha,&nbsp;Marcin Zadworny,&nbsp;Antoni Werner","doi":"10.1016/j.mycres.2009.06.002","DOIUrl":"10.1016/j.mycres.2009.06.002","url":null,"abstract":"<div><p>Ectomycorrhizal fungi are known to synthesize antifungal compounds both <em>in vitro</em> and in symbiosis with the host-plants. Culture filtrates of the ectomycorrhizal fungus <em>Suillus bovinus</em> (at pHs of 2.5–6) showed antifungal activity towards saprotrophs <em>Trichoderma harzianum</em>, and <em>Trichoderma virens</em> and the pathogen <em>Heterobasidion annosum</em>, by significantly suppressing their growth relative to sterile liquid medium at the same pHs. In the presence of the culture filtrates, hyphae of the saprotrophs and the pathogen were characterized by distensions, irregular and frequent branching, tip damage and cytoplasm coagulation. Since hyphal abnormalities may be evoked by disruptions in the cytoskeleton and mitochondria, their structural changes were also examined. Depolymerization of microtubules was confirmed for all of the fungi. Serious damage to mitochondria morphology may cause significant functional impairment. Growth of mycelia was inhibited in the lower pH <em>S. bovinus</em> culture filtrate, and the mitochondrial morphology was altered. This suggests that the activity of antifungal compounds synthesized by ectomycorrhizal fungus is significantly affected by pH.</p></div>","PeriodicalId":19045,"journal":{"name":"Mycological research","volume":"113 9","pages":"Pages 981-990"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mycres.2009.06.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"28255101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}