scholarly journals The Classification of Micrococci and Staphylococci Based on their DNA Base Composition and Adansonian Analysis

1966 ◽  
Vol 44 (2) ◽  
pp. 281-292 ◽  
Author(s):  
S. ROSYPAL ◽  
A. ROSYPALOVA ◽  
J. HOREJS
Keyword(s):  
Base Composition ◽  
Dna Base Composition ◽  
Dna Base

DNA base composition, nature of intracellular DNA, morphology, and classification of bacteriophages infecting Micrococcus luteus

1979 ◽  
Vol 25 (9) ◽  
pp. 1027-1035 ◽  
Author(s):  
Scott W. Compton ◽  
John A. Mayo ◽  
Melanie Ehrlich ◽  
H. W. Ackermann ◽  
Lise Tremblay ◽  
...  
Keyword(s):  
Host Range ◽  
Base Composition ◽  
Micrococcus Luteus ◽  
Gc Content ◽  
Dna Base Composition ◽  
Bacterial Virus ◽  
Double Stranded Dna ◽  
Dna Base

Ten bacteriophages infecting Micrococcus luteus have been characterized. All phages contain double-stranded DNA, of 64.3–73.5 mol% guanine plus cytosine (GC). The DNA of phage N7 has the highest GC content reported for any bacterial virus. No unusual bases have been found. The intracellular replicating DNAs of six phages are covalently closed circular molecules. All 10 phages have isometric, probably icosahedral, heads and long, flexible, noncontractile tails and can be sorted into two morphological groups based on size and presence or absence of a collar. Host-range studies indicate six host-range groups.

New species of Humicola: an approach to genetic and biochemical classification

1976 ◽  
Vol 54 (24) ◽  
pp. 2755-2768 ◽  
Author(s):  
Marco de Bertoldi
Keyword(s):  
New Species ◽  
Base Composition ◽  
Genetic Relationships ◽  
Morphological Characters ◽  
Morphological Features ◽  
Dna Base Composition ◽  
Dna Base

Thirteen new species of Humicola are described: H. aurea, H. glauca, H. lutea, H. piriformis, H. repens, H. sardiniae, H. variabilis, H. atra, H. austera, H. globosa, H. nivea, H. rugosa, and H. veronae. The classification is based not only on morphological characters but also on genetic and biochemical ones. In Hyphomycetes similarities in morphology do not necessarily indicate genetic relationships. DNA base composition (guanine–cytosine percentage, GC%) and electrophoretic characteristics of enzymes used together with morphological features have proved to be useful and of taxonomical value in the classification of the new species of Humicola.

DNA base composition and the taxonomy of the Oomycetes

1972 ◽  
Vol 18 (7) ◽  
pp. 963-968 ◽  
Author(s):  
Beverley R. Green ◽  
Michael W. Dick
Keyword(s):  
Base Composition ◽  
Gradient Centrifugation ◽  
Cesium Chloride ◽  
Generic Level ◽  
Dna Base Composition ◽  
Composition Data ◽  
General Base ◽  
Dna Base ◽  
Cscl Gradient

The DNA base compositions of seven members of the Saprolegniaceae were determined by cesium chloride (CsCl) gradient centrifugation. In general, base composition data correlated with morphological classification, but in several cases it indicated the necessity for revisions. In particular, Achlya inflata (eccentric group) was 42% guanine–cytosine (GC), while A. racemosa, A. sparrowii, and A. colorata (racemose group) were 51–52% GC.Two isolates of Saprolegnia diclina and one of S. parasitica were 58–59% GC and all contained 10–20% of a lighter density satellite DNA.Analysis of thermal denaturation curves by a modification of De Ley's method (J. Theoret. Biol. 22: 89 (1969)) showed that as little as 7.4% GC difference represents a large difference in DNA sequence homology. Therefore, base composition data by itself can provide a rigorous aid to the classification of the oomycetous fungi at the generic level.

Classification of the genus Humicola Traaen: II. The DNA base composition of some strains within the genus

1972 ◽  
Vol 47 (1-2) ◽  
pp. 153-159 ◽  
Author(s):  
A. A. Lepidi ◽  
M. P. Nuti ◽  
M. Bertoldi ◽  
M. Santulli
Keyword(s):  
Base Composition ◽  
Dna Base Composition ◽  
Dna Base
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