{"title":"Light-microscopical studies on development and morphology of a bacterium of the genus Pasteuria parasitizing Heterodera goettingiana","authors":"R. Winkelheide , D. Sturhan","doi":"10.1016/S0232-4393(11)80113-7","DOIUrl":"10.1016/S0232-4393(11)80113-7","url":null,"abstract":"<div><p>In a <em>Pasteuria</em> population found in pea cyst nematodes, <em>Heterodera goettingiana</em>, at Münster/Germany (HGP) the developmental cycle is similar to that in the three nematode-parasitic Pasteuria species described so far. In contrast to <em>P. penetrans</em> and <em>P. nishizawae</em>, however, infection takes place in the second-stage juveniles, in which also the whole developmental cycle is completed. Females or cysts of <em>H. goettingiana</em> were never found to be infected; in males spores attached to the cuticle were rarely observed. In comparison to the <em>Pasteuria</em> species parasitizing <em>Meloidogyne</em> resp. <em>Heterodera elachista</em> and other cyst nematodes, the reproduction rate of 500 spores/nematode is extremely low. Distinction of the different <em>Pasteuria</em> species or isolates by light microscopy is difficult. HGP spores show obvious morphological differences to <em>P. thornei</em> only which is parasitizing <em>Pratylenchus</em>.</p></div><div><p>Bei einer an Erbsencystennematoden <em>(Heterodera goettingiana)</em> in Münster gefundenen <em>Pasteuria</em>-Population (HGP) verläuft die Entwicklung ähnlich wie bei den bisher beschriebenen drei nematodenparasitären <em>Pasteuria</em>-Arten. In Abweichung zu <em>P. penetrans</em> und <em>P. nishizawae</em> erfolgt die Infektion jedoch bei den L<sub>2</sub>-Juvenilen, in denen auch der gesamte Entwicklungszyklus durchlaufen wird. Eine Infektion von Weibchen oder Cysten wurde nicht beobachtet, selten eine Anheftung von Sporen an der Cuticula bei den Männchen von <em>H. goettingiana</em>. Im Vergleich zu den <em>Meloidogyne</em> bzw. <em>Heterodera elachista</em> und andere Cystennematoden parasitierenden <em>Pasteuria</em>-Arten ist die Vermehrungsrate mit durchschnittlich 500 Sporen/Nematode äußerst gering. Lichtmikroskopisch lassen sich die verschiedenen <em>Pasteuria</em>-Arten/Isolate nur schwer unterscheiden. HGP-Sporen zeigen lediglich gegenüber der <em>Pratylenchus</em> parasitierenden Art <em>P. thornei</em> deutliche morphologische Abweichungen.</p></div>","PeriodicalId":77473,"journal":{"name":"Zentralblatt fur Mikrobiologie","volume":"148 2","pages":"Pages 109-116"},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0232-4393(11)80113-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56538299","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":"Fusarium poae and Fusarium sporotrichioides in cereal grains of the Slovak Republic","authors":"Zdenka Jesenská","doi":"10.1016/S0232-4393(11)80116-2","DOIUrl":"10.1016/S0232-4393(11)80116-2","url":null,"abstract":"<div><p>The occurrence of <em>Fusarium poae</em> and <em>F. sporotrichioides</em> was examinated in 37172 cereal grains of 229 samples from the Slovak Republic. In an area where strains of <em>Fusarium</em> parasitized. 40% of grains on average, owing to unfavourable weather, 5 strains of <em>F. poae</em> were isolated (0.5 % out of 1015 strains of <em>Fusarium</em>). In an area where the situation was less unfavourable, <em>Fusarium</em> spp. contaminated on average 4.1% of grains, <em>F. poae</em> were present in 6.1 % out of 82 strains of <em>Fusarium</em>.</p><p>When cereal ripened and harvested under climatically favourable conditions. <em>Fusarium</em> spp. were isolated, on average, out of 3.0% of grains, but the strains of <em>F. poae</em> made an essential part of the mycoflora (25.5 % out of 985 isolated <em>Fusarium</em> strains). In three samples there were ascertained 5%, 15% and 19.5% of grains contaminated by strains of <em>F. poae, F. sporotrichioides</em> was isolated only 5 times.</p></div><div><p>Es wurde das Vorkommen von <em>Fusarium poae</em> und <em>F. sporotrichioides</em> in 37172 Getreidekörnern von 229 Proben aus der Slowakischen Republik untersucht. In dem Gebiet, wo die <em>Fusarium</em>-Arten als Folge ungünstigen Wetters durchschnittlich in 40 % der Körner parasitierten, wurde <em>F. poae</em> 5mal isoliert (0.5 % von 1015 <em>Fusarium</em>-Stämmen). Im Gebiet mit weniger ungünstiger Wetterlage kontaminierten die Fusarien durchschnittlich 4,1% der Körner. <em>F. poae</em> stellte 6,1 % der 82 isolierten <em>Fusarium</em>-Stämme. Wenn die Reife des Getreides und die Ernte unter klimatisch günstigen Bedingungen ablief, wurden <em>Fusarien</em> durchschnittlich aus 3,0% der Körner isoliert, wobei <em>F. poae</em> am häufigsten vorkam (25,5% von 985 Fusarium-Stämmen). In 3 Proben waren 5%, 15% und 19,5% der Körner mit <em>F. poae</em> kontaminiert. <em>F. sporotrichioides</em> wurde nur 5mal isoliert.</p></div>","PeriodicalId":77473,"journal":{"name":"Zentralblatt fur Mikrobiologie","volume":"148 2","pages":"Pages 129-136"},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0232-4393(11)80116-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19463251","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":"Fungal flora of cement polluted soils in Egypt","authors":"S.K. Hemida, M.M.K. Bagy , A.M.A. Khallil","doi":"10.1016/S0232-4393(11)80118-6","DOIUrl":"10.1016/S0232-4393(11)80118-6","url":null,"abstract":"<div><p>Mycoflora of 40 soil samples collected from cultivated and desert soils, exposed to cement dust were studied. Ten species belonging to 7 genera of zoosporic fungi, in addition to <em>Dactylella rhompospora</em> (aquatic hyphomycetes) were recovered from cultivated and desert soils, using baiting technique. <em>Pythium debaryanum</em> and <em>Dictyuchus sterilis</em> were the commonest species. Seventy-one species in addition to two varieties, which belong to 34 genera were collected from 20 samples of each of cultivated (20 genera and 45 species + 1 var.) and desert (31 genera and 61 species + 2 var.) soils, on glucose-agar medium. On cellulose-agar medium, fifty-six species and 2 varieties representing 26 genera were collected from 20 samples of each of cultivated (24 genera and 40 species + 2 var.) and desert (20 genera and 40 species + 2 var.) soils. <em>Aspergillus, Penicillium</em> and <em>Emericella</em> were the most frequent genera in the studied soils on both media.</p></div><div><p>Die Mycoflora von Kulturböden und mit Zementstaub belasteten Böden wurde vergleichsweise studiert (40 Bodenproben). Es wurden 10 Arten zoosporen-bildender Pilze, die zu 7 Gattungen gehörten inklusive <em>Dactylella rhompospora</em> (aquatischer Hyphomycet), mit Hilfe der Fangtechnik gefunden. <em>Pythium debaryanum</em> und <em>Dictyuchus sterilis</em> waren die verbreitetsten Arten. Aus je 20 Sammelproben von Kulturböden bzw. verunreinigten Böden wurden auf Glucose-Agar-Medium 71 Arten inklusive 2 Varietäten gefunden. Diese gehörten zu 34 Gattungen. In kultivierten Böden waren 20 Gattungen und 45 Arten plus 1 Varietät erfaßt, in den belasteten Böden 31 Gattungen und 61 Arten plus 2 Varietäten. Auf Cellulose-Agar-Medium wurden 56 Arten inklusive 2 Varietäten erfaßt, die in 26 Gattungen eingeteilt werden konnten, davon 24 Gattungen und 40 Arten plus 2 Varietäten in Kulturböden und 20 Gattungen und 40 Arten inklusive 2 Varietäten in den belasteten Böden. <em>Aspergillus, Penicillium</em> und <em>Emericella</em> wurden am häufigsten in beiden Böden und auf beiden Medien gefunden.</p></div>","PeriodicalId":77473,"journal":{"name":"Zentralblatt fur Mikrobiologie","volume":"148 2","pages":"Pages 148-157"},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0232-4393(11)80118-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56537837","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":"Mycoflora and mycotoxin of hazelnut (Corylus avellana L.) and walnut (Juglans regia L.) seeds in Egypt","authors":"A.I.I. Abdel-Hafez , Sabah M. Saber","doi":"10.1016/S0232-4393(11)80117-4","DOIUrl":"10.1016/S0232-4393(11)80117-4","url":null,"abstract":"<div><p>Fifty-one species and 3 varieties appertaining to 20 genera were collected from 20 samples of each of hazelnut and walnut seeds on glucose- and 40% (W/V) sucrose-Czapek's agar at 25 °C and 45 °C with the most common mesophiles were <em>Aspergillus flavus, A. fumigatus, A. niger, Cladosporium cladosporioides, C. herbarum, Penicillium chrysogenum, P. citrinum</em> and <em>P. oxalicum. Fusarium</em> (represented by <em>F. equiseti, F. moniliforme</em> and <em>F. oxysporum</em>) was recovered from walnut seeds in moderate frequency (on glucose-Czapek's agar).</p><p><em>Eurotium</em> (<em>E. amstelodami, E. chevalieri, E. repens</em> and <em>E. rubrum</em>) was completely absent on glucose agar, but it was isolated in high frequency from the two types of seeds on 40% sucrose-Czapek's agar.</p><p><em>Aspergillus fumigatus</em> and <em>Rhizomucor pusillus</em> were the most common thermophilic fungi in hazelnut and walnut seeds on glucose agar at 45 °C. <em>Humicola grisea</em> var. <em>themoidae</em> and <em>Thermoascus aurantiacus</em> were encountered rarely from walnuts.</p><p>The nuts samples were assayed for natural occurrence of aflatoxins B<sub>1</sub>, B<sub>2</sub>, G<sub>1</sub> and G<sub>2</sub>, citrinin, ochratoxin A, patulin, sterigmatocystin, zearalenone, T-2 toxin and diacetoxyscirpenol by thin layer chromatography analysis. Aflatoxin was detected in 90% of hazelnut samples (25–175 μg/kg) and 75% of walnut samples (15–25 μg/kg). Zearalenone was detected in one sample of walnut (125 μg/kg). This is the first report for the presence of zearalenone in walnut. The other mycotoxins were not detected.</p></div><div><p>51 Arten und 3 Varietäten, die zu 20 Gattungen gehörten, wurden aus jeweils 20 Proben von Haselnuß- und Walnußfrüchten auf Glucose- und 40% (W/V) Saccharose-Czapek-Agar bei 25°C und 45°C isoliert. Die verbreitetsten mesophilen Pilze waren <em>Aspergillus flavus, A. fumigatus, A. niger, Cladosporium cladosporioides, C. herbarum, Penicillium chrysogenum, P. citrinum</em> und <em>P. oxalicum</em>. Fusarium, repräsentiert durch <em>F. equiseti, F. moniliforme</em> und <em>F. oxysporum</em> wurden in geringerer Häufigkeit auf Wulnußfrüchten (Glucose-Czapek-Agar) gefunden. <em>Eurotium</em> (<em>E. amstelodami, E. chevalieri, E. repens</em> und <em>E. rubrum</em>) fehlten vollkommen auf Glucose-Agar, wurden aber häufig auf 40% Saccharose-Czapek-Agar gefunden.</p><p><em>Aspergillus fumigatus</em> und <em>Rhizomucor pusillus</em> waren die verbreitetsten thermophilen Pilze in Haselnuß-und Walnußfrüchten (Glucoseagar, 45°C). <em>Humicola grisea</em> var. <em>themoidae</em> und <em>Thermoascus aurantiacus</em> wurden selten von Walnüssen isoliert.</p><p>Die Nußproben wurden auf ihr natürliches Vorkommen an Aflatoxinen B<sub>1</sub>, B<sub>2</sub>, G<sub>1</sub> und G<sub>2</sub>, Citrinin, Ochratoxin A, Patulin, Sterigmatocystin, Zearalenone, T-2-Toxin und Diacetoxyscirpenol mit Hilfe der Dünnschichtchromatografie analysiert. Afla","PeriodicalId":77473,"journal":{"name":"Zentralblatt fur Mikrobiologie","volume":"148 2","pages":"Pages 137-147"},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0232-4393(11)80117-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19463252","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":"The localization of toxin in the cells of Pasteurella multocida","authors":"Wilfried Erler","doi":"10.1016/S0232-4393(11)80109-5","DOIUrl":"10.1016/S0232-4393(11)80109-5","url":null,"abstract":"<div><p>The application of the degradation procedure for Gram-negative bacteria according to Bewick and Lo to <em>Pasteurella multocida</em> indicates that the obvious localization of the toxin is in the periplasm. The stability of the outer membrane and of the substances adhering to it is essential for the release of the toxin. The production of the toxin clearly depend on the media used.</p></div><div><p>Die Anwendung des Degradations Verfahrens für gramnegative Bakterien nach Bewick und Lo auf <em>Pasteurella multocida</em> läßt in bezug auf das Vorkommen des Toxins in der Bakterienzelle eindeutig auf dessen Lokalisation im periplasmatischen Raum schließen. Für die Freisetzung des Toxins ist die Stabilität der äußeren Membran und der ihr aufgelagerten Substanzen maßgebend. Hinsichtlich der Toxinproduktion besteht eine eindeutige Abhängigkeit von den verwendeten Medien.</p></div>","PeriodicalId":77473,"journal":{"name":"Zentralblatt fur Mikrobiologie","volume":"148 2","pages":"Pages 83-87"},"PeriodicalIF":0.0,"publicationDate":"1993-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0232-4393(11)80109-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19463253","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":"Einfluß einer vorausgehenden Bodentrocknung auf Herbizidwirkungen gegenüber Mikroorganismen sowie der Nitrifikation und dem Celluloseabbau","authors":"H.-P. Malkomes","doi":"10.1016/S0232-4393(11)80076-4","DOIUrl":"10.1016/S0232-4393(11)80076-4","url":null,"abstract":"<div><p>A loamy sand soil was dried, stored up to four months and remoistened before the herbicides ‘Kerb 50 W’ (Propyzamide) and ‘Flüssig Herbogil’ (Dinoterb) were applied. The influence of drying on microbial populations, nitrification and cellulose decomposition as well as on microbial response to the herbicides was investigated. In fresh soil especially ‘Flüssig Herbogil’ caused dose-dependent changes in microbial populations and reduced nitrification. The cellulose decomposition was inhibited or stimulated depending in the period of decomposition. Dry storage changed microbial populations and their response to the herbicides, but had less pronounced effects on nitrification. It also increased the duration of inhibited cellulose decomposition. Therefore, these results even require precise description of the conditions under which the soils were stored before they were used in ecotoxicological laboratory trials.</p></div><div><p>In einem lehmigen Sandboden wurde der Einfluß einer bis zu vier Monate dauernden Trockenlagerung vor Versuchsbeginn auf Mikroorganismen, die Nitrifikation und den Celluloseabbau sowie deren Beeinflussung durch die Herbizide ‚Kerb 50 W‛ (Propyzamid) und ‚Flüssig Herbogil‛ (Dinoterb) untersucht. Im nicht gelagerten Boden verursachte vor allem ‚Flüssig Herbogil‛ dosisabhängige Populationsveränderungen und eine Hemmung der Nitrifikation. Der Celluloseabbau wurde je nach Abbauphase gehemmt oder stimuliert. Die Trockenlagerung modifizierte die Mikroorganismenpopulationen, weniger die Nitrifikation, und deren Reaktion auf die Herbizide. Sie verlängerte beim Celluloseabbau die Phase der herbizidbedingten Hemmungen. Aus dem vorliegenden Versuch ergibt sich die Notwendigkeit, für ökotoxikologische Laborversuche auch die Lagerungsbedingungen der Versuchsböden vor Versuchsbeginn möglichst genau zu kennzeichnen.</p></div>","PeriodicalId":77473,"journal":{"name":"Zentralblatt fur Mikrobiologie","volume":"148 1","pages":"Pages 24-31"},"PeriodicalIF":0.0,"publicationDate":"1993-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0232-4393(11)80076-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56536817","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":"[Labeling of yeast protoplasts by neutral red and nile blue for fusion experiments].","authors":"K Schöps, G Menzel","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Neutral red and Nile blue were found to be suitable for staining protoplasts from various strains of Saccharomyces cerevisiae. The absorption of stains by the protoplasts was dependent on the pH value, for both stains. At a pH of 7.9 the protoplasts of the fusion partners could be stained differently and therefore it was possible to observe the fusion between the various strains of yeast. Consequently the prerequisites were created for the following micromanipulation.</p>","PeriodicalId":77473,"journal":{"name":"Zentralblatt fur Mikrobiologie","volume":"148 1","pages":"11-5"},"PeriodicalIF":0.0,"publicationDate":"1993-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19434560","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}
V Maipa, C Papadopoulou, C Pappas, D Dimitriou, L Voutsinas, H Malatou
{"title":"Survival of Salmonella enteritidis during the manufacture of feta cheese made of pasteurized ewe's milk.","authors":"V Maipa, C Papadopoulou, C Pappas, D Dimitriou, L Voutsinas, H Malatou","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The behaviour of Salmonella enteritidis during the Feta cheese making process was investigated. Two lots of pasteurized whole ewe's milk were inoculated to contain 10(6) cfu/ml of S. enteritidis (strain AS1 and AS2) and were processed into Feta cheese following standard procedures. All samples were examined for S. enteritidis both quantitatively and qualitatively, while moisture, fat, water activity and pH were also measured. S. enteritidis was enumerated in duplicate samples by surface plating on SS agar. Selected salmonella-like colonies were identified biochemically and serologically. The enumerations have shown that S. enteritidis was initially entrapped in the curd. Then the growth of S. enteritidis gradually decreased and no Salmonellae were quantitatively enumerated after the 23rd day. However S. enteritidis was detected qualitatively in samples taken until the 38th day.</p>","PeriodicalId":77473,"journal":{"name":"Zentralblatt fur Mikrobiologie","volume":"148 1","pages":"66-73"},"PeriodicalIF":0.0,"publicationDate":"1993-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19434563","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}