ISSN:0027-5514    

DOI:10.1080/00275514.1955.12024423

出版商:Taylor&Francis    

年代:1955

数据来源: Taylor

摘要:

SUMMARYSchizosaccharomyces pombeY-658 is deficient for biotin, pantothenic acid, and inositol. The following amounts per ml are sufficient for maximal growth: biotin, 0.001μg; pantothenic acid, 0.1μg inositol, 8.0μg. The inclusion of either thiamine or pyridoxine in the medium resulted in a significant increase in growth over that which occurred in the absence of both. For a maximal growth rate, both were essential.Adenine and uracil had a stimulatory effect on the early growth of the yeast.AlthoughS. pombeY-658 utilized either (NH4)2SO4or asparagine as its sole source of nitrogen, its growth was stimulated by glutamic acid, by aspartic acid, and even more, by vitamin-free casein hydrolyzate.A method of overcoming flocculence is described.

ISSN:0027-5514    

DOI:10.1080/00275514.1955.12024424

出版商:Taylor&Francis    

年代:1955

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1955.12024425

出版商:Taylor&Francis    

年代:1955

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1955.12024426

出版商:Taylor&Francis    

年代:1955

数据来源: Taylor

摘要:

SUMMARYExposures were made over the Atlantic Ocean on two transatlantic flights in June and August, 1951, from Montreal to London and return, using the McGill-GE, slit, and filter samplers. Nutrient plates were exposed in the McGill-GE sampler and plates and silicone slides in the slit sampler. Dilution plates were made from the filters.Cladosporiumwas the commonest fungus, comprising 4108 (82.3%) of the total. Nonsporulating,Alternaria, Pullularia, yeasts,Penicillium, Botrytis, andStemphyliumconstituted 3.2, 2.6, 2.3, 2.1, 1.6, 1.5 and 1.1% of the total colonies. The following eighteen additional genera were present: Popularia, Fusarium, Actinomycetes (Streptomyces),Aspergillus, Oospora, Phoma, Helminthosporium, Cephalothecium, Zythia, Trichoderma, Verticillium, Spicaria, Sporormia, Nigrospora, Cephalosporium, Sphaeronema, Coniothyrium, andChaetomium.Quantitatively the fungi were determined on a cubic foot basis.Cladosporiumin polar air ranged from 0.01 to 0.1 per cubic foot with the McGill-GE sampler and 0.14 to 2.4 per cubic foot with the slit sampler; in tropical air numbers were higher, reaching 7.8 per cubic foot in one air mass over the western Atlantic.Cladosporium herbarumwas the commonest species.C. cladosporioidesandC. macrocarpumwere found occasionally. The remaining genera were less than one per cubic foot.Fungus spores were determined from silicone slides exposed in the slit sampler. The number varied from 0.2 per cubic foot in polar air to 529 per cubic foot in modified tropical air.Cladosporiumspores were most abundant, having concentrations up to 9.0 per cubic foot. In general, the same fungi were obtained on the slides as on the plates except for smuts. Chlamydospores of theUstilagotype were found on all but 7 slides with a high in 4.5 per cubic foot in tropical air near Iceland. Many of the fungus spores were in clusters or groups. Hyphal fragments, and often conidiophores, were present on most of the slides exposed in tropical air.The evidence indicates no gradual diminution as distance from land increases, but that numbers in the air are correlated with air masses and fungi can successfully make the west to east crossing of the Atlantic.

ISSN:0027-5514    

DOI:10.1080/00275514.1955.12024427

出版商:Taylor&Francis    

年代:1955

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1955.12024428

出版商:Taylor&Francis    

年代:1955

数据来源: Taylor

摘要:

SUMMARYFour species of theOphiostomataceaehave been found associated withDendroctonus engelmanniHopkins in bark of dyingPicea engelmanniiParry in Colorado.Leptographium engelmannii, the perfect stage of which has not been observed, is the most prominent and most consistently associated species, and is described as new. It causes a conspicuous stain in the sapwood of the insect-attacked trees.Ophiostoma truncicola, described as new, is frequently present in main galleries of the beetles.Endoconidiophora coerulescensMünch, is also sometimes present in the galleries and on sapwood of logs cut from beetle infested trees. The fourth fungus,Ophiostoma bicolorDavidson and Wells, described as new, has been isolated once fromD. engelmanniadult beetle but was obtained from other sources such asIps hunter?andMonochamus scutellatus(in Canada). All of these were obtained from bark beetle infested Engelmann spruce in Colorado except that the latter species (O. bicolor) was also obtained from Canada and from other hosts.

ISSN:0027-5514    

DOI:10.1080/00275514.1955.12024429

出版商:Taylor&Francis    

年代:1955

数据来源: Taylor

摘要:

SUMMARYA great many strains ofAspergillushave been isolated and examined since the publication of the“Manual of the Aspergilli”by Thom and Raper in 1945. Among this number, strains representing five new species and five new varieties have been encountered. The new species and varieties are described in the present paper, and include:1.Aspergillus paradoxus, doubtfully a member of theA. clavatusgroup, characterized by small clavate vesicles and the production of yellow sclerotium-like bodies.2.Aspergillus aureolus, an ascosporic member of theA. fumigatusgroup, characterized by vegetative mycelium in bright golden shades and ascospores with convex surfaces conspicuously echinulate.3.Aspergillus fischerivar.glaber, duplicating the species in most particulars, but producing ascospores with convex surfaces smooth. (A. fumigatusgroup.)4.Aspergillus violaceus, an ascosporic member of theA. nidulansseries, characterized by a paucity of conidial structures and ascospores in deep violet-blue shades.5.Aspergillus nidulansvar.acristatus, duplicating the species generally but producing ascospores without equatorial crests or surface ornamentation.6.Aspergillus nidulansvar.echinulatus, duplicating the species in most particulars but producing ascospores with convex surfaces echinulate rather than smooth.7.Aspergillus variecolorvar.astellatus, duplicating the species generally, but showing lobed asci and producing ascospores with wide, non-stellate crests. (A. nidulansgroup.)8.Aspergillus deflectus, a member of theA. ustusgroup, characterized by restrictedly growing colonies and conidial heads borne at or near right angles to the main axes of the conidiophores.9.Aspergillus silvaticus, a non-ascosporic form which appears to be intermediate between theA. versicolorandA. nidulansgroups.10.Aspergillus terreusvar.africanus, duplicating the species in most characteristics but producing abundant yellow sclerotium-like bodies.The description ofAspergillus unguis, previously recognized as a non-ascosporic member of theA. nidulansgroup, is emended to include a strain which produces occasional perithecia and ascospores approximating those ofA. nidulans.

ISSN:0027-5514    

DOI:10.1080/00275514.1955.12024430

出版商:Taylor&Francis    

年代:1955

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1955.12024431

出版商:Taylor&Francis    

年代:1955

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1955.12024432

出版商:Taylor&Francis    

年代:1955

数据来源: Taylor