{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,4,29]],"date-time":"2023-04-29T07:41:26Z","timestamp":1682754086958},"reference-count":39,"publisher":"Akademiai Kiado Zrt.","issue":"4","content-domain":{"domain":["akjournals.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2002,11,1]]},"abstract":"<jats:p>Two types of actinophages, \u03c6S and \u03c6L, were isolated from soil samples by using<jats:italic>Streptomyces scabies<\/jats:italic>MR13, a potato scab pathogen, as an indicator strain. The phages were partially characterized according to their physicochemical properties, plaques and particles morphology and their host-range. The host-range of these phages was narrow for \u03c6S and wide for \u03c6L. The adsorption rate constants of the \u03c6S and \u03c6L were 3.44 \u00d7 10<jats:sup>\u22129<\/jats:sup>and 3.18 \u00d7 10<jats:sup>\u22129<\/jats:sup>ml\/min, and their burst sizes were 1.61 and 3.75 virions, respectively. One-step growth indicated that \u03c6S and \u03c6L have a latent period of 30 min followed by a rise period of 30 min. The temperate character of these phages was tested in other isolates of<jats:italic>Streptomyces<\/jats:italic>. Four of the phages (\u03c6SS3, \u03c6SS12, \u03c6SS13 and \u03c6SS17) were identified as temperate phages, since they were able to lysogenize SS3, SS12, SS13 and SS17. \u03c6SS3, \u03c6SS12 and \u03c6SS13 were homoimmune, and they were heteroimmune with respect to \u03c6SS17. The restriction barriers of lysogenic isolates (SS12, SS13 and SS17) interfered with the blockage of plaques formation by phages (\u03c6SS12, \u03c6SS13 or \u03c6SS17) propagated on them, about 75% of lysogenic isolates had restriction systems. The exposure of the lysogenic isolates (SS12, SS13 and SS17) to UV-irradiation prevented the possible restriction barriers of these isolates, and these barriers could be overcome.<\/jats:p>","DOI":"10.1556\/amicr.49.2002.4.5","type":"journal-article","created":{"date-parts":[[2004,8,26]],"date-time":"2004-08-26T19:44:33Z","timestamp":1093549473000},"page":"469-482","update-policy":"http:\/\/dx.doi.org\/10.1556\/policypage.crossmark.crossref.1","source":"Crossref","is-referenced-by-count":1,"title":["Isolation and characterization of two types of actinophages infecting Streptomyces scabies MR13"],"prefix":"10.1556","volume":"49","author":[{"given":"A.","family":"El-Sayed","sequence":"first","affiliation":[{"name":"1 Zagazig University Department of Botany, Faculty of Science Zagazig Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"G.","family":"El-Didamony","sequence":"additional","affiliation":[{"name":"1 Zagazig University Department of Botany, Faculty of Science 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