Methanococcus frisius sp.nov., a new methylotrophic marine methanogen

1986 ◽  
Vol 32 (2) ◽  
pp. 127-131 ◽  
Author(s):  
Karl Heinz Blotevogel ◽  
Ulrich Fischer ◽  
Karl Heinz Lüpkes
Keyword(s):  
Cell Wall ◽  
North Sea ◽  
Base Composition ◽  
West Germany ◽  
Methanogenic Bacterium ◽  
Dna Base Composition ◽  
Gram Negative ◽  
Dna Base ◽  
Highly Sensitive ◽  
Ph Range

A Gram-negative, nonmotile, coccoid methanogenic bacterium of 0.9–1.6 μm in diameter was isolated from shoal mud of the southern North Sea (West Germany). The isolate grew on H2 + CO2, methanol, and methylamines. Best growth occurred between 35 and 42 °C in a pH range of 6.5–7.2. The organism was highly sensitive to detergents and the cell wall probably consisted only of proteins. Growth of the organism was inhibited in the presence of ionophores like monensin or lasalocid. The DNA base composition was 38.2 ± 1.0 mol% G+C. The isolate is considered to be anew species and the name Methanococcus frisius is proposed.

scholarly journals Cell wall, DNA base composition and lipid studies onListeria denitrificans(Prevot)

1983 ◽  
Vol 18 (1-2) ◽  
pp. 131-134 ◽  
Author(s):  
Matthew David Collins ◽  
Sara Feresu ◽  
Dorothy Jones
Keyword(s):  
Cell Wall ◽  
Base Composition ◽  
Dna Base Composition ◽  
Dna Base

Mutants with altered DNA base composition inBacterium paracoli — the evidence from a marker

1971 ◽  
Vol 11 (2) ◽  
pp. 91-95 ◽  
Author(s):  
G. F. Gause ◽  
A. V. Laiko ◽  
M. V. Bibikova ◽  
L. I. Kusovkova ◽  
T. I. Selesneva ◽  
...  
Keyword(s):  
Base Composition ◽  
Dna Base Composition ◽  
Dna Base

William Bateson, Richard Goldschmidt, and Non-Genic Modes of Speciation

2003 ◽  
Vol 11 (04) ◽  
pp. 341-350 ◽  
Author(s):  
D. R. Forsdyke
Keyword(s):  
New Species ◽  
Base Composition ◽  
Hybrid Sterility ◽  
Parental Factors ◽  
Dna Base Composition ◽  
William Bateson ◽  
Dna Base ◽  
Negative Effect ◽  
Positive Effect ◽  
Richard Goldschmidt

Sometimes a cross between two individuals that appear to belong to the same species produces a sterile offspring (i.e., their hybrid is sterile). Thus, the two individuals appear reproductively isolated from each other. If each could find a compatible mate, then new species might emerge. At issue is whether the form of hybrid sterility that precedes sympatric differentiation into species is, in the general case, of genic or non-genic origin. Several recent papers lend the authority of William Bateson to the genic hypothesis, referring to the "Bateson–Dobzhansky–Muller hypothesis". All these papers cite a 1996 paper that, in turn, cites a 1909 paper of Bateson. However, from 1902 until 1926 the latter espoused a non-genic hypothesis that today would be classified as "chromosomal". Analysis of Bateson's 1909 text reveals no recantation. Bateson's non-genic view was similar to that advanced by Richard Goldschmidt in the 1940s. However, Bateson proposed a contribution from parents of abstract factors that, together in their hybrids, complement to bring about a negative effect (hybrid sterility). In contrast, Goldschmidt proposed that normally parents contribute complementary factors making parental chromosomes compatible at meiosis in their hybrids, which hence are fertile (i.e., the parental factors work together to produce a positive effect). When the factors are not sufficiently complementary the parental chromosomes are incompatible in their hybrids, which hence are sterile. The non-genic Batesonian–Goldschmidtian abstractions are now being fleshed-out chemically in terms of DNA base-composition differences.

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