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  • Evolution  (61)
  • Springer  (61)
  • American Chemical Society
  • Essen : Verl. Glückauf
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • 2015-2019
  • 2005-2009
  • 1985-1989  (61)
  • 1980-1984
  • 1989  (33)
  • 1986  (28)
Collection
Keywords
Publisher
  • Springer  (61)
  • American Chemical Society
  • Essen : Verl. Glückauf
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
Years
  • 2015-2019
  • 2005-2009
  • 1985-1989  (61)
  • 1980-1984
Year
  • 1
    Electronic Resource
    Electronic Resource
    Evolutionary relationship of psbA genes from cyanobacteria, cyanelles and plastids (1989)
    Springer
    Current genetics 15 (1989), S. 335-340 
    Details
    ISSN: 1432-0983
    Keywords: psbA ; Cyanelle ; Cyanophora paradoxa ; Evolution ; Sequence analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The psbA gene is part of the reaction center of photosystem II in cyanobacteria and the plastids of higher plants. Its primary sequence is highly conserved among all species investigated so far and its sequence shows homologies with the L and M subunits of the reaction center of photosynthetic bacteria. We have analyzed the psbA homolog from a eukaryotic alga, Cyanophora paradoxa, where the gene is encoded on cyanelle DNA. These cyanelles are surrounded by a murein sacculus and resemble cyanobacteria in many other characteristics, although they are genuine organelles that functionally replace plastids. Analysis of the gene revealed a psbA protein identical in length (360 codons) with the cyanobacterial counterpart. The overall sequence identity is, however, more pronounced between cyanelle psbA and the shorter (353 amino acids) psbA product found in higher plants. These data strongly support the postulated bridge position of cyanelles between chloroplasts and free-living cyanobacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00419913
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation and complete sequence of the yeast isoleucyl-tRNA synthetase gene (ILS1) (1989)
    Springer
    Current genetics 15 (1989), S. 99-106 
    Details
    ISSN: 1432-0983
    Keywords: Yeast ; Isoleucyl-tRNA synthetase ; Isoleucine ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The isoleucyl-tRNA synthetase gene (ILS1) from the yeast Saccharomyces cerevisiae was cloned and sequenced. This gene was initially cloned because it cross-hybridizated to what is now presumed to be the isoleucyl-tRNA synthetase gene (cupC) from the protozoan Tetrahymena hhermophila. The ILS1 gene was determined to be 1,072 amino acids in length. A comparison with a recently published sequence of ILS1 1 from another laboratory (Englisch et al. 1987) was made and differences noted. Two promoter elements were detected, one for general amino acid control and one for constitutive transcription. A heat shock protein (hsp70) gene (probably SSA3) was found 237 by upstream from the ILS1 translation start site. The ILS1 amino acid sequence was compared to isoleucyl-tRNA synthetases from other organisms, as well as to valyl-, leucyl- and methionyl-tRNA synthetases. Regions of conservation between these enzymes were found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00435455
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  • 3
    Electronic Resource
    Electronic Resource
    Chloroplast ribosomal DNA organization in the chromophytic alga Olisthodiscus luteus (1989)
    Springer
    Current genetics 15 (1989), S. 221-229 
    Details
    ISSN: 1432-0983
    Keywords: Chloroplast DNA ; Chlorophyll a/c alga ; Evolution ; Ribosomal operon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary There are almost no data describing chloroplast genome organization in chromophytic (chlorophyll a/c) plants. In this study chloroplast ribosomal operon placement and gene organization has been determined for the golden-brown alga Olisthodiscus luteus. Ribosomal RNA genes are located on the chloroplast DNA inverted repeat structure. Nucleotide sequence analysis, demonstrated that in contrast to the larger spacer regions in land plants, the 16S–23S rDNA spacer of O. luteus is only 265 by in length. This spacer contains tRNAIle and tRNAAla genes which lack introns and are separated by only 3 bp. The sequences of the tRNA genes and 16S and 23S rDNA termini flanking the spacer were examined to determine homology between O. luteus, chlorophytic plant chloroplast DNA, and prokaryotes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00435509
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  • 4
    Electronic Resource
    Electronic Resource
    A comparison of theβ A- andβ B-globin gene clusters of sheep (1989)
    Springer
    Journal of molecular evolution 28 (1989), S. 175-184 
    Details
    ISSN: 1432-1432
    Keywords: Sheep ; Globin genes ; Evolution ; Gene duplication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Domestic sheep have two common alleles at the adult β-globin locus,β A andβ B. Here we report the structure of the β-globin locus of A-haplotype sheep. The locus consists of 12 genes, organized as a triplicated 4-gene set: 5′ ∈I-∈II-ΨβI-βC-∈III-∈IV-ΨβII-βA-∈V-∈VI-ΨβIII-βF 3′. This arrangement is identical to that of the closely related goat locus. Sheep with the B haplotype have a locus arrangement consisting of a duplicated four-gene set, lacking the βC gene as well as three other genes present in A sheep and goats. In order to understand the evolutionary history of the B sheep locus, we have sequenced the βB gene from these sheep, and the βB gene from A-haplotype sheep, and compared the sequences to those of the sheep βA, goat βC, and βA, and cow adult β genes. Our results indicate that the βB gene has diverged recently from the βA gene, and therefore the βB locus structure may have resulted from a recent deletion from a triplicated locus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02102474
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  • 5
    Electronic Resource
    Electronic Resource
    An NTP-binding motif is the most conserved sequence in a highly diverged monophyletic group of proteins involved in positive strand RNA viral replication (1989)
    Springer
    Journal of molecular evolution 28 (1989), S. 256-268 
    Details
    ISSN: 1432-1432
    Keywords: Evolution ; Multiple sequence alignment ; NTP binding ; Phylogenetic analysis ; Positive-strand RNA viruses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary NTP-motif, a consensus sequence previously shown to be characteristic of numerous NTP-utilizing enzymes, was identified in nonstructural proteins of several groups of positive-strand RNA viruses. These groups include picorna-, alpha-, and coronaviruses infecting animals and como-, poty-, tobamo-, tricorna-, hordei-, and furoviruses of plants, totalling 21 viruses. It has been demonstrated that the viral NTP-motif-containing proteins constitute three distinct families, the sequences within each family being similar to each other at a statistically highly significant level. A lower, but still valid similarity has also been revealed between the families. An overall alignment has been generated, which includes several highly conserved sequence stretches. The two most prominent of the latter contain the socalled “A” and “B” sites of the NTP-motif, with four of the five invariant amino acid residues observed within these sequences. These observations, taken together with the results of comparative analysis of the positions occupied by respective proteins (domains) in viral multidomain proteins, suggest that all the NTP-motif-containing proteins of positive-strand RNA viruses are homologous, constituting a highly diverged monophyletic group. In this group the “A” and “B” sites of the NTP-motif are the most conserved sequences and, by inference, should play the principal role in the functioning of the proteins. A hypothesis is proposed that all these proteins posses NTP-binding capacity and possibly NTPase activity, performing some NTP-dependent function in viral RNA replication. The importance of phylogenetic analysis for the assessment of the significance of the occurrence of the NTP-motif (and of sequence motifs of this sort in general) in proteins is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02102483
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  • 6
    Electronic Resource
    Electronic Resource
    Mu transposable elements are structurally diverse and distributed throughout the genusZea (1989)
    Springer
    Journal of molecular evolution 29 (1989), S. 28-39 
    Details
    ISSN: 1432-1432
    Keywords: Transposable elements ; Zea mays ; Evolution ; Inverted repeats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The Robertson's Mutator stock of maize exhibits a high mutation rate due to the transposition of theMu family of transposable elements. All characterizedMu elements contain similar ≈200-bp terminal inverted repeats, yet the internal sequences of the elements may be completely unrelated. Non-Mutator stocks of maize have a 20–100-fold lower mutation rate relative to Mutator stocks, yet they contain multiple sequences that hybridize to theMu terminal inverted repeats. Most of these sequences do not cohybridize to internal regions of previously clonedMu elements. We have cloned two such sequences from the maize line B37, a non-Mutator inbred line. These sequences, termedMu4 andMu5, have an organization characteristic of transposable elements and possess ≈200-bpMu terminal inverted repeats that flank internal DNA, which is unrelated to other clonedMu elements.Mu4 andMu5 are both flanked by 9-bp direct repeats as has been observed for otherMu elements. However, we have no direct evidence that they have recently transposed because they have not been found in known genes. Although the internal regions ofMu4 andMu5 are not related by sequence similarity, both elements share an unusual structural feature: the terminal inverted repeats extend more than 100 bp internally fromMu-similar termini. The distribution of these elements in maize lines and related species suggests thatMu elements are an ancient component of the maize genome. Moreover, the structure of theMu termini and the fact thatMu termini are found flanking different internal sequences leads us to speculate thatMu termini once may have been capable of transposing as independent entities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02106179
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  • 7
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    Probable reassortment of genomic elements among elongated RNA-containing plant viruses (1989)
    Springer
    Journal of molecular evolution 29 (1989), S. 52-62 
    Details
    ISSN: 1432-1432
    Keywords: Genome organization ; Evolution ; Plant virus ; RNA recombination ; Sequence similarity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The relationships of genome organization among elongated (rod-shaped and filamentous) plant viruses have been analyzed. Sequences in coding and noncoding regions of barley stripe mosaic virus (BSMV) RNAs 1, 2, and 3 were compared with those of the monopartite RNA genomes of potato virus X (PVX), white clover mosaic virus (WClMV), and tobacco mosaic virus, the bipartite genome of tobacco rattle virus (TRV), the quadripartite genome of beet necrotic yellow vein virus (BNYVV), and icosahedral tricornaviruses. These plant viruses belong to a supergroup having 5′-capped genomic RNAs. The results suggest that the genomic elements in each BSMV RNA are phylogenetically related to those of different plant RNA viruses. RNA 1 resembles the corresponding RNA 1 of tricornaviruses. The putative proteins encoded in BSMV RNA 2 are related to the products of BNYVV RNA 2, PVX RNA, and WClMV RNA. Amino acid sequence comparisons suggest that BSMV RNA 3 resembles TRV RNA 1. Also, it can be proposed that in the case of monopartite genomes, as a rule, every gene or block of genes retains phylogenetic relationships that are independent of adjacent genomic elements of the same RNA. Such differential evolution of individual elements of one and the same viral genome implies a prominent role for gene reassortment in the formation of viral genetic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02106181
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  • 8
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    Intra- and interspecies analyses of the carcinoembryonic antigen (CEA) gene family reveal independent evolution in primates and rodents (1989)
    Springer
    Journal of molecular evolution 29 (1989), S. 126-134 
    Details
    ISSN: 1432-1432
    Keywords: Carcinoembryonic antigen ; Evolution ; Gene family ; Human ; Rat ; Synonymous substitutions ; Silent molecular clock ; Evolutionary trees
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Various rodent and primate DNAs exhibit a stronger intra- than interspecies cross-hybridization with probes derived from the N-terminal domain exons of human and rat carcinoembryonic antigen (CEA)-like genes. Southern analyses also reveal that the human and rat CEA gene families are of similar complexity. We counted at least 10 different genes per human haploid genome. In the rat, approximately seven to nine different N-terminal domain exons that presumably represent different genes appear to be present. We were able to assign the corresponding genomic restriction endonuclease fragments to already isolated CEA gene family members of both human and rat. Highly similar subgroups, as found within the human CEA gene family, seem to be absent from the rat genome. Hybridization with an intron probe from the human nonspecific cross-reacting antigen (NCA) gene and analysis of DNA sequence data indicate the conservation of noncoding regions among CEA-like genes within primates, implicating that whole gene units may have been duplicated. With the help of a computer program and by calculating the rate of synonymous substitutions, evolutionary trees have been derived. From this, we propose that an independent parallel evolution, leading to different CEA gene families, must have taken place in, at least, the primate and rodent orders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02100111
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  • 9
    Electronic Resource
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    Rates of molecular evolution and the fraction of nucleotide positions free to vary (1989)
    Springer
    Journal of molecular evolution 29 (1989), S. 180-187 
    Details
    ISSN: 1432-1432
    Keywords: Divergence ; Mitochondrial DNA ; Molecular evolution ; Constraints ; Two-parameter model ; Evolutionary distance ; Evolution ; Mutation ; Neutral space ; Variable positions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Selective constraints on DNA sequence change were incorporated into a model of DNA divergence by restricting substitutions to a subset of nucleotide positions. A simple model showed that both mutation rate and the fraction of nucleotide positions free to vary are strong determinants of DNA divergence over time. When divergence between two species approaches the fraction of positions free to vary, standard methods that correct for multiple mutations yield severe underestimates of the number of substitutions per site. A modified method appropriate for use with DNA sequence, restriction site, or thermal renaturation data is derived taking this fraction into account. The model also showed that the ratio of divergence in two gene classes (e.g., nuclear and mitochondrial) may vary widely over time even if the ratio of mutation rates remains constant. DNA sequence divergence data are used increasingly to detect differences in rates of molecular evolution. Often, variation in divergence rate is assumed to represent variation in mutation rate. The present model suggests that differing divergence rates among comparisons (either among gene classes or taxa) should be interpreted cautiously. Differences in the fraction of nucleotide positions free to vary can serve as an important alternative hypothesis to explain differences in DNA divergence rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02100116
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  • 10
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    Variation in salmonid mitochondrial DNA: Evolutioinary constraints and mechanisms of substitution (1989)
    Springer
    Journal of molecular evolution 29 (1989), S. 233-245 
    Details
    ISSN: 1432-1432
    Keywords: Mitochondrial DNA ; Salmonids ; Nucleotide sequence ; Transitions ; Transversions ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sequence comparisons were made from 2214 bp of mitochondrial DNA cloned from six Pacific salmonid species. These sequences include the genes for ATPase subunit 6, cytochrome oxidase subunit 3, NADH dehydrogenase subunit 3, NADH dehydrogenase subunit 4L, tRNAGLY, and tRNAARG. Variation is found at 338 silent and 12 nonsilent positions of protein coding genes and 10 positions in the two tRNA sequences. A single 3-bp length difference was also detected. In all pairwise comparisons the sequence divergence observed in the fragment was higher than that previously predicted by restriction enzyme analysis of the entire molecule. The inferred evolutionary relationship of these species is consistent between methods. The distribution of silent variation shows a complex pattern with greatly reduced variation at the junctions of genes. The variation in the tRNA sequences is concentrated in the DHU loop. The close relationship of these species and extensive sequence analyzed allows for an analysis of the spectrum of substitutions that includes the frequencies of all 12 possible substitutions. The observed spectrum of substitutions is related to potential pathways of spontaneous substitution. The salmonid sequences show an extremely high ratio of silent to replacement substitutions. In addition the amino acid sequences of the four proteins coded in this fragment show a consistently high level of identity with theXenopus sequences. Taken together these data are consistent with a slower rate of amino acid substitution among the cold-blooded vertebrates when compared to mammals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02100207
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  • 11
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    Identification of a locality in snake venomα-neurotoxins with a singificant compositional similarity to marine snailα-conotoxins: Implications for evolution and structure/activity (1989)
    Springer
    Journal of molecular evolution 29 (1989), S. 355-366 
    Details
    ISSN: 1432-1432
    Keywords: α-Conotoxin ; α-Neurotoxin ; Erabutoxin b ; Evolution ; Venom
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary α-neurotoxins from elapid snake venoms andα-conotoxins from marine snails bind specifically and with high affinity to nicotinic cholinoceptors. Although both types of toxin are polypeptides, there is more than a fourfold difference in size between the two and no clear sequence homology is evident. A systematic computer search of the three-dimensional structure of erabutoxin b (anα-neurotoxin from the false sea snakeLaticauda semifasciata) was performed to identify the locality that most closely matched the amino acid compositions of the smallerα-conotoxins (from the marine snailsConus magus andConus geographus). The area of greatest similarity centered on residue position 25 of erabutoxin b, a locale that is conserved throughout the snakeα-neurotoxins and their homologues. Six Proteins unrelated to erabutoxin b were compared to theα-conotoxins to show that the extent of the erabutoxin b/α-conotoxin match was too high to be coincidental. Homologues of erabutoxin b, namelyα-cobratoxin fromNaja naja siamensis and cytotoxin VII4 fromNaja mossambica mossambica, were also analyzed. The extent of the matching with theα-conotoxins decreased in the series erabutoxin b〉α-cobratoxin〉cytotoxin VII4, and this also relates the order of similarity to the pharmacological properties of theα-conotoxins. Theα-conotoxin-like area of the snakeα-neurotoxins is peripheral to the site previously considered important for binding to the cholinoceptor, even though it seems to represent the focus of evolutionary convergence between the two types of neurotoxin. The area of resemblance does, however, have strong associations with the conformational behavior of the snake toxins. Hence, the outcome of this study has important consequences for the current ideas on snakeα-neurotoxin structure/activity relationships and the evolutionary origins of neurotoxicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02103622
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  • 12
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    Construction of a physical map of the 45 kb photosynthetic gene cluster of Rhodobacter sphaeroides (1989)
    Springer
    Archives of microbiology 151 (1989), S. 454-458 
    Details
    ISSN: 1432-072X
    Keywords: Photosynthesis ; Photosynthetic bacteria ; Evolution ; Bacteriochlorophyll ; Reaction centres ; Light harvesting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 1) A number of overlapping clones have been isolated from a Rhodobacter sphaeroides gene bank. Following conjugative gene transfer from Escherichia coli these clones restore a wild type phenotype to several mutants unable to synthesise bacteriochlorophyll. 2) The insert DNA was analysed by restriction mapping and together the clones form the basis of the first restriction map of the 45 kb photosynthetic gene cluster of Rb. sphaeroides. 3) This cluster is bounded on one side by puh A encoding the reaction centre H polypeptide and on the other by the puf operon encoding reaction centre L and M apoproteins and light harvesting LH1 and polypeptides. 4) DNA fragments from the 45 kb cluster were used to probe genomic DNA from other photosynthetic bacteria. Using heterologous hybridisation conditions, a significant degree of homology is shown between Rb. sphaeroides and these other bacteria, suggesting close evolutionary links with Rb. capsulatus in particular.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00416606
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  • 13
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    Thermotoga thermarum sp. nov. and Thermotoga neapolitana occurring in African continental solfataric springs (1989)
    Springer
    Archives of microbiology 151 (1989), S. 506-512 
    Details
    ISSN: 1432-072X
    Keywords: Eubacteria ; Evolution ; Extreme thermophile ; Thermotoga
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three new strains of eubacterial hyperthermophiles were isolated from continental solfataric springs at Lac Abbé (Djibouti, Africa). Due to their morphology, lipids, and RNA polymerases they belong to the genus Thermotoga. Strains LA4 and LA10 are closely related to Thermotoga neapolitana found up to now only in the marine environment. Strain LA 3 differs from Thermotoga maritima and Thermotoga neapolitana in significant physiological and molecular properties. It is described as the new species Thermotoga thermarum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454866
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  • 14
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    Enzyme diversity in pearl millet (Pennisetum glaucum) (1989)
    Springer
    Theoretical and applied genetics 77 (1989), S. 634-640 
    Details
    ISSN: 1432-2242
    Keywords: Isoenzymes ; Evolution ; Domestication ; Biological structure ; Genetic distances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The survey of enzyme polymorphism in West African pearl millet cultivars reported by Tostain et al. 1987 has been extended to include populations from other regions of Africa and from India. The eight enzyme systems studied included: alcohol dehydrogenase, β-esterase, catalase, phosphoglucoisomerase, phosphoglucomutase, 6-phosphogluconate dehydrogenase, glutamate oxaloacetate transaminase, and malate dehydrogenase. One-hundred-ninety-nine populations of millet were analyzed, including 74 populations studied earlier. No new enzyme diversity was observed. Intrapopulation diversity ranged from 70%–90% of the total diversity, depending on their regions of origin. Four principal groups were distinguished in the following decreasing order of diversity: early-maturing cultivars from West and East Africa, late — maturing cultivars from West and East Africa, cultivars from India, and cultivars from southern Africa. The early-maturing cultivars were distributed between two principal focal points from East Africa in the East to Mali in the West. In the center were found millets from Niger which were most diverse. Indian and southern African cultivars were distinct, with the former appearing relatively similar to those of Niger, and the latter somewhat similar to late-maturing cultivars from West Africa, a diverse group that included late-maturing cultivars from East Africa. Based on the results obtained, an evolutionary hypothesis proposed here includes: multiple domestications in the Sahel, creation of early-maturing cultivars and their migration eastwards to India plus a southwards migration to Sudanian zone, and creation of late-maturing cultivars and their migration simultaneously westwards, eastwards, and southwards to southern Africa.
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    URL: http://dx.doi.org/10.1007/BF00261235
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  • 15
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    Genomic organization of the ribosomal DNA of sorghum and its close relatives (1989)
    Springer
    Theoretical and applied genetics 77 (1989), S. 844-850 
    Details
    ISSN: 1432-2242
    Keywords: Evolution ; Restriction fragment length polymorphism ; Grasses ; Maize ; Sugarcane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The structure and organization of the ribosomal DNA (rDNA) of sorghum (Sorghum bicolor) and several closely related grasses were determined by gel blot hybridization to cloned maize rDNA. Monocots of the genus Sorghum (sorghum, shattercane, Sudangrass, and Johnsongrass) and the genus Saccharum (sugarcane species) were observed to organize their rDNA as direct tandem repeats of several thousand rDNA monomer units. For the eight restriction enzymes and 14 cleavage sites examined, no variations were seen within all of the S. bicolor races and other Sorghum species investigated. Sorghum, maize, and sugarcane were observed to have very similar rDNA monomer sizes and restriction maps, befitting their close common ancestry. The restriction site variability seen between these three genera demonstrated that sorghum and sugarcane are more closely related to each other than either is to maize. Variation in rDNA monomer lengths were observed frequently within the Sorghum genus. These size variations were localized to the intergenic spacer region of the rDNA monomer. Unlike many maize inbreds, all inbred Sorghum diploids were found to contain only one rDNA monomer size in an individual plant. These results are discussed in light of the comparative timing, rates, and modes of evolutionary events in Sorghum and other grasses. Spacer size variation was found to provide a highly sensitive assay for the genetic contribution of different S. bicolor races and other Sorghum species to a Sorghum population.
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    URL: http://dx.doi.org/10.1007/BF00268337
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  • 16
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    Chromosomal location of gliadin coding genes in T. aestivum ssp. spelta and evidence on the lack of components controlled by Gli-2 loci in wheat aneuploids (1989)
    Springer
    Theoretical and applied genetics 78 (1989), S. 177-183 
    Details
    ISSN: 1432-2242
    Keywords: Wheat aneuploids ; Null forms ; Storage proteins ; Gliadins ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Electrophoretical analyses of the gliadin fraction extracted from seeds of the intervarietal substitution lines of T. aestivum ssp. spelta in the T. aestivum ssp. vulgare cv ‘Chinese Spring’ for the homoeologous groups 1 and 6 and substitution lines of 6D chromosome of ‘Chinese Spring’ in the durum wheat cv ‘Langdon’ allowed the identification of seeds without gliadin proteins controlled by genes on chromosome 6A and 6B. A gliadin component of ‘Chinese Spring’, not previously assigned to any specific chromosome, is controlled by chromosome 6D in the 6D (6A) and 6D (6B) disomic substitution lines of ‘Langdon’. Additional genes controlling the synthesis of this component may be present on other chromosomes, very likely 6A and 6B, since the analysis of the ‘Chinese Spring’ compensating nullisomic-tetrasomics involving the 6D chromosome does not show the loss of this component or any apparent change in staining intensity. Chromosomal location data and two-dimensional gliadin maps reveal close homologies between the two hexaploid wheats, ‘Chinese Spring’ (T. aestivum ssp. vulgare) and T. aestivum ssp. spelta, belonging to different subspecies in the hexaploid group of genomic formula AABBDD. The comparison of gliadin electrophoretic patterns aiding in the identification of evolutionary pathways in wheat is stressed.
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    URL: http://dx.doi.org/10.1007/BF00288796
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  • 17
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    Evidence for the existence of 2n gametes in Lotus tenuis Wald. et Kit. (2n=2x=12): their relevance in evolution and breeding of Lotus corniculatus L. (2n=4x=24) (1989)
    Springer
    Theoretical and applied genetics 78 (1989), S. 400-404 
    Details
    ISSN: 1432-2242
    Keywords: Lotus corniculatus ; Lotus tenuis ; 2n gametes ; Evolution ; Breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Crosses between male sterile L. corniculatus (2n=4x=24) and L. tenuis (2n=2x=12) plants were performed in order to verify the presence of 2n gametes in L. tenuis. All but one of the plants from these crosses had 2n=4x=24 and the L. corniculatus phenotype; this plant had 2n=2x=12 and the L. tenuis phenotype. The plants also showed good quantity of pollen at tripping, good pollen fertility and good percentage of seed setting in the backcross to L. corniculatus. On the whole, both cytological and morphological observations, showing that all but one of the plants from L. corniculatus x L. tenuis were normal tetraploids, suggest the existence of diploandrous gametes in L. tenuis. On the other hand, haploid parthenogenesis probably gave origin to the dihaploid plant 2n=2x=12.
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    URL: http://dx.doi.org/10.1007/BF00265303
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  • 18
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    The characterization and comparative analysis of high-molecular-weight glutenin genes from genomes A and B of a hexaploid bread wheat (1989)
    Springer
    Theoretical and applied genetics 77 (1989), S. 689-700 
    Details
    ISSN: 1432-2242
    Keywords: Triticum ; Homoeoalleles ; Evolution ; Dough ; Gene library
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two high-molecular-weight subunit (HMWS) glutenin genes from the A and B genomes of the hexaploid bread wheat Triticum aestivum L. cv Cheyenne have been isolated and sequenced. Both of these genes are of the high Mr class (x-type) of HMW glutenins, and have not been previously reported. The entire set of six HMW genes from cultivar Cheyenne have now been isolated and characterized. An analysis of the Ax and Bx sequences shows that the Ax sequence is similar to the homoeologous gene from the D genome, while the Bx repeat structure is significantly different. The repetitive region of these proteins can be modelled as a series of interspersed copies of repeat modifs of 6, 9, and 15 amino acid residues. The evolution of these genes includes single-base substitutions over the entire coding region, plus insertion/deletions of single or blocks of repeats in the central repetitive domain.
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    URL: http://dx.doi.org/10.1007/BF00261246
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    Gene sequence for the 9 kDa component of Photosystem II from the cyanobacterium Phormidium laminosum indicates similarities between cyanobacterial and other leader sequences (1989)
    Springer
    Molecular genetics and genomics 216 (1989), S. 334-339 
    Details
    ISSN: 1617-4623
    Keywords: Cyanobacteria ; Evolution ; Thylakoid ; Leader sequence ; Photosystem II
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A 9 kDa polypeptide which is loosely attached to the inner surface of the thylakoid membrane and is important for the oxygen-evolving activity of Photosystem II in the thermophilic cyanobacterium Phormidium laminosum has been purified, a partial amino acid sequence obtained and its gene cloned and sequenced. The derived amino acid sequence indicates that the 9 kDa polypeptide is initially synthesised with an N-terminal leader sequence of 44 amino acids to direct it across the thylakoid membrane. The leader sequence consists of a positively charged N-terminal region, a long hydrophobic region and a typical cleavage site. These features have analogous counterparts in the “thylakoid-transfer domain” of lumenal polypeptides from chloroplasts of higher plants. These findings support the view of the proposed function of this domain in the two-stage processing model for import of lumenal, nuclear-encoded polypeptides. In addition, there is striking primary sequence homology between the leader sequences of the 9 kDa polypeptide and those of alkaline phosphatase (from the periplasmic space of Escherichia coli) and, particularly in the region of the cleavage site, the 16 kDa polypeptide of the oxygen-evolving apparatus in the thylakoid lumen of spinach chloroplasts.
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    URL: http://dx.doi.org/10.1007/BF00334373
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    Mutagenic DNA repair genes on plasmids from the ‘pre-antibiotic era’ (1989)
    Springer
    Molecular genetics and genomics 218 (1989), S. 323-329 
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    ISSN: 1617-4623
    Keywords: Mutagenic DNA repair ; Evolution ; Murray collection ; impCAB
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Resistance transfer factors are natural conjugative plasmids encoding antibiotic resistance. Some also encode mutagenic DNA repair genes giving resistance to DNA damage and induced mutagenesis. It has been shown that antibiotic resistance has been acquired by recent transposition events; however, we show here that mutagenic repair genes existed much earlier on these types of plasmids. Conjugative plasmids from eight incompatibility groups from the Murray collection of ‘pre-antibiotic era’ enterobacteria were tested for complementation of mutagenic repair-deficient Escherichia coli umuC36. Although none of these plasmids carry transposon-encoded drug resistance genes, IncI1 and IncB plasmids were identified which restored ultraviolet resistance and induced mutability to umuC36 mutants. Furthermore they increased the UV resistance and induced mutability of wild-type E. coli, Klebsiella aerogenes and Citrobacter intermedius, thus showing that they could confer a general selective advantage to a variety of hosts. Like know mutagenic repair genes, complementation by these plasmid genes required the SOS response of the host cell. Nucleotide hybridisation showed that these plasmids harboured sequences similar to the impCAB locus, the mutagenic repair operon of modern-day IncI1 plasmids. The evolution of mutagenic repair genes is discussed.
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    URL: http://dx.doi.org/10.1007/BF00331285
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    The non-existence of a principle of natural selection (1989)
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    Biology and philosophy 4 (1989), S. 255-273 
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    ISSN: 1572-8404
    Keywords: Natural Selection ; Evolution ; Principle ; Probability ; Propensity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Philosophy
    Notes: Abstract The theory of natural selection is a rich systematization of biological knowledge without a first principle. When formulations of a proposed principle of natural selection are examined carefully, each is seen to be exhaustively analyzable into a proposition about sources of fitness and a proposition about consequences of fitness. But whenever the fitness of an organic variety is well defined in a given biological situation, its sources are local contingencies together with the background of laws from disciplines other than the theory of natural selection; and the consequences of fitness for the long range fate of organic varieties are essentially applications of probability theory. Hence there is no role and no need for a principle of the theory of natural selection, and any generalities that may hold in that theory are derivative rather than fundamental.
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    URL: http://dx.doi.org/10.1007/BF02426626
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    Does evolutionary biology contribute to ethics? (1989)
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    Biology and philosophy 4 (1989), S. 287-301 
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    ISSN: 1572-8404
    Keywords: Evolution ; Incest Taboo ; Ethics ; Behavioral Development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Philosophy
    Notes: Abstract Human propensities that are the products of Darwinian evolution may combine to generate a form of social behavior that is not itself a direct result of such pressure. This possibility may provide a satisfying explanation for the origin of socially transmitted rules such as the incest taboo. Similarly, the regulatory processes of development that generated adaptations to the environment in the circumstances in which they evolved can produce surprising and sometimes maladaptive consequences for the individual in modern conditions. These combinatorial aspects of social and developmental dynamics leave a subtle but not wholly uninteresting role for evolutionary biology in explaining the origins of human morality.
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    URL: http://dx.doi.org/10.1007/BF02426629
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    How evolutionary biology challenges the classical theory of rational choice (1989)
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    Biology and philosophy 4 (1989), S. 457-481 
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    ISSN: 1572-8404
    Keywords: Evolution ; evolutionary biology ; fitness ; decision theory ; theory of choice ; rationality ; rational behavior ; reductionism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Philosophy
    Notes: Abstract A fundamental philosophical question that arises in connection with evolutionary theory is whether the fittest patterns of behavior are always the most rational. Are fitness and rationality fully compatible? When behavioral rationality is characterized formally as in classical decision theory, the question becomes mathematically meaningful and can be explored systematically by investigating whether the optimally fit behavior predicted by evolutionary process models is decision-theoretically coherent. Upon investigation, it appears that in nontrivial evolutionary models the expected behavior is not always in accord with the norms of the standard theory of decision as ordinarily applied. Many classically irrational acts, e.g. betting on the occurrence of one event in the knowledge that the probabilities favor another, can under certain circumstances constitute adaptive behavior. One interesting interpretation of this clash is that the criterion of rationality offered by classical decision theory is simply incorrect (or at least incomplete) as it stands, and that evolutionary theory should be called upon to provide a more generally applicable theory of rationality. Such a program, should it prove feasible, would amount to the logical reduction of the theory of rational choice to evolutionary theory.
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    URL: http://dx.doi.org/10.1007/BF00162590
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    Hemoglobin polymorphism in macaques with reference to the evolution ofMacaca fascicularis andMacaca mulatta (1989)
    Springer
    Primates 30 (1989), S. 95-102 
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    ISSN: 0032-8332
    Keywords: Macaques ; Hemoglobin ; Duplication hypothesis ; Evolution ; Isoelectric focusing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Blood samples were collected fromMacaca fascicularis andMacaca mulatta living in indoor breeding groups and investigated electrophoretically. Hemoglobin polymorphism was observed in both species. Isoelectric focusing was performed on urea denaturated samples to test the hypothesis of a site duplication at theα-chain locus inM. fascicularis (Barnicot et al., 1970). The results of our investigations do not support the above mentioned hypothesis. Only one locus coding theα-chain was detected, and this is under the control of two alleles. Evolutionary events at the molecular level are discussed, as well asWheatley's hypothesis (1980) that malaria was an important force behind divergence in both species. InM. fascicularis hemoglobin variants might be similarily connected with malaria resistance as in man. We suggest that this was not an important process behind speciation in macaques.
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    Significant differences between the chloroplast genomes of two Acetabularia mediterranea strains (1989)
    Springer
    Molecular genetics and genomics 219 (1989), S. 199-203 
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    ISSN: 1617-4623
    Keywords: Sequence rearrangement ; Gene localization ; Restriction analysis ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The chloroplast DNAs of Acetabularia mediterranea strains 5 and 17 differ significantly in their restriction patterns. Southern blotting analysis using gene probes derived from the coding regions of spinach genes showed that psbB and petB each map to unique restriction fragments which are shared in strains 5 and 17. On the other hand psaA, psbA and rbcL map to different restriction fragments in strains 5 and 17 probably as a result of restriction fragment length polymorphism. In addition to restriction fragment polymorphism there is evidence for much larger differences in the organization of the plastome. The most striking difference is the absence in strain 5 of a 10 kb repeated sequence which has previously been demonstrated in strain 17. However, both strains apparently share at least 8 kb of the 10 kb repeated sequence. Restriction analysis of independent clones of the 10 kb sequence revealed a family of non-identical repeats.
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    Comparison of sequences from the malB regions of Salmonella typhimurium and Enterobacter aerogenes with Escherichia coli K12: A potential new regulatory site in the interoperonic region (1989)
    Springer
    Molecular genetics and genomics 218 (1989), S. 199-207 
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    ISSN: 1617-4623
    Keywords: Maltose transport ; malB region ; Positive regulation ; Palindromic units ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The malE and malK genes from Salmonella typhimurium, and the MalEFG operon and a portion of malK from Enterobacter aerogenes were cloned and sequenced. Plasmid-borne malE genes from both species and the malF and malG genes from E. aerogenes were expressed normally in Escherichia coli, and their products function in maltose transport. This shows that the malB products from the three species are interchangeable, at least in the combinations tested. The general genetic organization of the malB region is conserved. Potential binding sites and distances between them are highly conserved in the regulatory intervals. An unexpected conserved region was detected, which we call the U box, and which could be another target for a regulatory protein. This hypothesis is supported by the presence of the U box in the regulatory, region of the pulA-malX operon in Klebsiella pneumoniae. The intergenic region between malE and malF from S. typhimurium and E. aerogenes, contains inverted repeats similar to the palindromic units (PU or REP) found at the same location in E. coli. The predicted amino acid sequence of the encoded proteins showed 90% or more identity in every pairwise comparison of species.
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    Trophic ecomorphology in eastern Pacific blennioid fishes: character transformation of oral jaws and associated change of their biological roles (1989)
    Springer
    Environmental biology of fishes 24 (1989), S. 199-218 
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    ISSN: 1573-5133
    Keywords: Blenniidae ; Chaenopsidae ; Evolution ; Generalization ; Labrisomidae ; Morphological series ; Oral jaw apparatus ; Specialization ; Tripterygiidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The ecomorphological relationships between the oral jaws and food spectra were highlighted in 34 species of Gulf of California blennioid fishes (5 Tripterygiidae, 13 Labrisomidae, 11 Chaenopsidae and 5 Blenniidae). Twenty-nine species are microcarnivorous, two are omnivorous browsers, two are algae grazers and one was an ‘ectoparasite’ feeder. The spectrum of oral (as opposed to pharyngeal) jaw (OJA) morphology ranges from plesiomorphic, suction-feeding (relatively large, protrusible jaws, with many coniform-caniniform teeth) to apomorphic, biting (relatively small, non protrusible jaws, with a single row of incisiform teeth). As species with similar morphology may widely differ in food, it is concluded, that morphology is not a reliable predictor for ecology in this case. With the exception of a few specialists, species with apomorphic, biting OJA utilize sessile items in addition to mobile categories and thus show a higher food diversity as compared to species with plesiomorphic OJA. Thus in the present case morphological differentiation goes along with ecological generalization. Only three blenniid species with the most apomorphic OJA may be considered as specialized also with regard to food resource utilization. Transformation of morphological characters and the ecological role of the OJA of blennioids may serve as a model to illustrate the steps required to achieve a biting-browsing and grazing feeding apparatus in many taxa of modern acanthopterygian reef fishes.
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    Evolution of structure, order and complexity in biological systems: Part III of a general theory (1989)
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    Journal of biological physics 17 (1989), S. 109-125 
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    ISSN: 1573-0689
    Keywords: Evolution ; order ; complexity ; biological systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract In this, Part III of a general theory, the large-scale features of evolution of structure, order, and complexity are considered as characteristic features of the biological state of matter. This starts with a rigorous formal definition of structure, classes of structural order, complexity, measures of complexity, and how these arise through evolution by a cumulative process of storing information in memory systems. Three such memory systems have evolved: the genetic memory, the immune memory, and the memories of the nervous system. The evolution, characteristic parameters and the limitations of these memory systems are explored. From these considerations emerge the large-scale features of the evolutionary pathways of biological structure, function, and complexity.
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    Dentition patterns among Pacific and Western Atlantic butterflyfishes (Perciformes, Chaetodontidae): relationship to feeding ecology and evolutionary history (1989)
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    Environmental biology of fishes 25 (1989), S. 159-170 
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    ISSN: 1573-5133
    Keywords: Jaws ; Evolution ; Corals ; Teeth ; Cladistics ; Specialists
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The jaw dentition of fifteen species of Pacific and Western Atlantic chaetodontid butterflyfishes was examined in light of their feeding habits and phylogenetic relationships. The ancestral tooth pattern is typical of many of the butterflyfishes, and variations on this basic pattern involve changes in the arrangement, length and number of teeth, and tooth shape to a lesser extent. Many of the more derived conditions can be explained by simple changes in relative jaw shape and size. Despite what appears to be adequate time for evolutionary changes to occur between the Pacific and Western Atlantic faunas, many species retain the generalized tooth arrangement permitting efficient exploitation in a very generalized manner. However, Pacific species as a whole show more specialized morphologies for hard coral feeding than do Western Atlantic species. Cases of parallel and divergent evolution are identified between and among the two faunas. Most morphological change associated with feeding in butterflyfishes is confined to the anterior region of the head, and particularly a few key elements. Suggestions for future morphological studies on the chaetodontids are outlined.
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    Subunit-specific monoclonal antibodies to tarantula hemocyanin, and a common epitope shared with calliphorin (1989)
    Springer
    Journal of comparative physiology 159 (1989), S. 139-151 
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    ISSN: 1432-136X
    Keywords: Calliphorin ; Hemocyanin ; Monoclonal antibodies ; Evolution ; Spiders
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Three murine hybridoma cell lines secreting IgG1 antibodies to 4×6 tarantula (Eurypelma californicum) hemocyanin were isolated, and the monoclonal antibodies Ec-7, Ec-8 and Ec-24 characterized by immunoblotting, immunoelectrophoresis and ELISA. WholeEurypelma hemocyanin, and the isolated subunitsa tog served as probes. For the subunits a novel, quick purification scheme on FPLC combined with immuno-affinity chromatography was established. Additionally, two cell lines secreting IgM antibodies were isolated. These antibodies showed irrelevant cross reactivities. Ec-7 strongly reacts with subunitd and weakly withb. Ec-8 and Ec-24 are specifically directed againstEurypelma subunitsa ande, respectively. The epitopes of Ec-7 and Ec-8 are sequence-dependent, whereas the Ec-24 epitope is conformation-dependent. Ec-8 and Ec-24 are specific forEurypelma hemocyanin. Ec-7 is not reactive to crustacean, centipede or gastropod hemocyanins, but binds to scorpion hemocyanin and to the immunological correlates of subunitsd andf in the hemocyanins of the spiderCupiennius salei and the xiphosuranLimulus polyphemus. In immunoblots with different polyclonal antisera,Eurypelma andAstacus hemocyanin cross-reacted with calliphorin, a larval serum protein from the blowflyCalliphora vicina. Calliphorin and chelicerate hemocyanins share the Ec-7 epitope. Sedimentation coefficients, pH stability regions, subunit size, and electron microscopical appearance of calliphorin are indiscernable from a typical 1×6 arthropod hemocyanin. This relationship is discussed in the context of hemocyanin evolution.
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    Comparative study of musculature in goldon monkey (Rhinopithecus) (1989)
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    Human evolution 4 (1989), S. 63-71 
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    ISSN: 1824-310X
    Keywords: Snub-nosed monkey ; Myology ; Evolution ; Functional anatomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Some differences between the muscular system of three species of golden monkeys were shown. The major features of the myology in these animals, besides that ofCercopithecoidea, are similar to the anthropoid apes and humans. Although most of the features between taxa of golden monkeys are largely homologous, there are also some differences. Our results differ slightly from thosePatterson (1942) obtained inR. roxellanae. Some conclusions reported by Patterson were obviously incorrect, since the specimen he used did not have a head. Many mylogical characters are similar to other species ofCercopithecoidea while some resemble those of apes. Many are similar to those of the leaf monkey, though some of them show much more development. The golden monkey is more advanced than any other species ofCercopithecoidea. We hypothesize that in terms of the myological characters the golden monkeys seem to occupy a position between the leaf monkeys and the apes.
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    Blood markers and genetic evolution in Cercopithecinae (1989)
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    Primates 30 (1989), S. 403-422 
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    ISSN: 0032-8332
    Keywords: Evolution ; Polymorphism ; Phylogeny ; Genetic markers ; Cercopithecinae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Serum proteins and RBC enzymes were surveyed in 16 species (183 animals) of African guenons (tribe Cercopithecini) in order to determine their genetic polymorphism and to establish dendrograms on the basis of their allele frequencies. The molecular data obtained were compared with those of mangabeys (16 animals tested) and discussed in the light of our results inPapio andMacaca. The species surveyed wereCercopithecus neglectus, C. hamlyni, C. l'hoesti (C. l'h. l'hoesti, C. l'h. preussi, andC. l'h. solatus), C. nictitans, C. mitis (C. m. kolbi, C. m. albotorquatus, C. m. stuhlmanni, andC. m. albogularis), C. cephus, C. ascanius, C. erythrotis, C. petaurista, C. mona, C. pogonias, C. wolfi, andC. aethiops, Miopithecus talapoin, Allenopithecus nigroviridis andErythrocebus patas, Lophocebus albigena, andCercocebus torquatus. Eleven loci (ten systems) were studied in red blood cell enzymes and the Gc, Gm, Km, and Bm systems in DBP and immunoglobulin serum proteins. Most of the loci were polymorphic. Similar and different polymorphisms occur in closely related species or subspecies, particularly inCercopithecus. Guenons have phenotypes clearly distinct from mangabeys.
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    Evolution of yields from populations with age-specific cropping (1989)
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    Evolutionary ecology 3 (1989), S. 343-359 
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    ISSN: 1573-8477
    Keywords: Evolution ; exploitation ; fisheries ; Gadus morhua ; life history ; optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Age-specific exploitation of a natural population acts as a selective force on genetic variation in life history traits. Evolution arising from this selection may bring about evolutionary changes in the total yield which the population is able to sustain. An analysis of this process is given for a harvested population with densitydependent recruitment, in which selection of life history traits by cropping is independent of density and frequency. Evolution of the total yield depends on an interplay between the yield from an individual over the course of its life and recruitment; whether the total yield increases or decreases depends on the properties of particular populations. Evolution brought about by harvesting does not, in general, lead to the maximization of the total yield. Nonetheless, by appropriate choice of an age-specific harvest pattern, it is possible in principle to select the life history which gives the maximum total yield following evolution; this harvest pattern is called the ‘evolutionarily stable optimal harvesting strategy’ (ESOHS). Results of the analysis are illustrated with data on the Arcto-Norwegian cod.
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    Nonequilibrium thermodynamics and different axioms of evolution (1986)
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    Acta biotheoretica 35 (1986), S. 77-106 
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    ISSN: 1572-8358
    Keywords: Evolution ; nonequilibrium thermodynamics ; boundary conditions models ; initial conditions models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Proponents of two axioms of biological evolutionary theory have attempted to find justification by reference to nonequilibrium thermodynamics. One states that biological systems and their evolutionary diversification are physically improbable states and transitions, resulting from a selective process; the other asserts that there is an historically constrained inherent directionality in evolutionary dynamics, independent of natural selection, which exerts a self-organizing influence. The first, the Axiom of Improbability, is shown to be nonhistorical and thus, for a theory of change through time, acausal. Its perception of the improbability of living states is at least partially an artifact of closed system thinking. The second, the Axiom of Historically Determined Inherent Directionality, is supported evidentially and has an explicit historical component. Historically constrained dynamic populations are inherently nonequilibrium systems. It is argued that living, evolving systems, when considered to be historically constrained nonequilibrium systems, do not appear improbable at all. Thus, the two axioms are not compatible. Instead, the Axiom of Improbability is considered to result from an unjustified attempt to extend the contingent proximal actions of natural selection into the area of historical, causal explanations. It is thus denied axiomatic status, and the effects of natural selection are subsumed as an additional level of constraint in an evolutionary theory derived from the Axiom of Historically Determined Inherent Directionality.
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    The location and possible evolutionary significance of small dispersed repeats in wheat ctDNA (1986)
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    Current genetics 10 (1986), S. 931-941 
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    ISSN: 1432-0983
    Keywords: T. aestivum ; Chloroplast DNA ; Repeat DNA ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Low-stringency hybridisation between recombinant plasmids representing the complete T. aestivum chloroplast genome has revealed small repeated DNA segments dispersed through the molecule. Thirty-two repeated DNA segments were detected, and they could be divided into 12 unrelated sets; no repeat was detected as multiple copies. The longest of the small repeats mapped just within the large inverted repeat in spinach and mung-bean ctDNAs. It was found to have been duplicated after the divergence of a cereal progenitor to generate a third, dispensible copy, 0.2 kbp downstream of rbcL. In maize at least, this copy has also become integrated, with rbcL, in the mitochondrial genome. Another of the repeats is thought to have mediated a chloroplast DNA inversion (Howe 1985). Thus the diverse collection of small repeats probably represents some consequences and causes of past recombination events as well as a mechanism for further intramolecular ctDNA recombination. Their possible significance in the restructuring and evolution of chloroplast genomes is discussed.
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    Globin evolution in the genusXenopus: Comparative analysis of cDNAs coding for adult globin polypeptides ofXenopus borealis andXenopus tropicalis (1986)
    Springer
    Journal of molecular evolution 23 (1986), S. 211-223 
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    ISSN: 1432-1432
    Keywords: Xenopus tropicalis ; Xenopus borealis ; Globin cDNAs ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Globin mRNAs ofXenopus borealis andXenopus tropicalis have been cloned and sequenced. The nucleotide and derived amino acid sequences were compared with each other and with already available data fromXenopus laevis. This analysis rendered clear evidence that the common ancestor ofX. laevis andX. borealis, but not ofX. tropicalis, had lost one amino acid of the β-globins prior to a genome duplication event that preceded the segregation of the former two species. Replacement-site substitutions were used to calculate a rough time scale of genome duplication and species segregation. The results suggest an ancient separation between theX. laevis and theX. tropicalis groups occurring approximately 110–120 million years ago. Analysis of the amino acid chains demonstrated various alterations. However, some functional domains, like heme-binding sites andα1β2 contact sites, were subject to a high degree of conservation, indicating the existence of functional constraints on them also in the genusXenopus.
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    Comparison of three actin-coding sequences in the mouse; Evolutionary relationships between the actin genes of warm-blooded vertebrates (1986)
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    Journal of molecular evolution 23 (1986), S. 11-22 
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    ISSN: 1432-1432
    Keywords: Actin-coding regions ; Sequence divergence ; Conversion ; Codon usage ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have determined the sequences of three recombinant cDNAs complementary to different mouse actin mRNAs that contain more than 90% of the coding sequences and complete or partial 3′ untranslated regions (3′UTRs): pAM 91, complementary to the actin mRNA expressed in adult skeletal muscle (αsk actin); pAF 81, complementary to an actin mRNA that is accumulated in fetal skeletal muscle and is the major transcript in adult cardiac muscle (αc actin); and pAL 41, identified as complementary to a β nonmuscle actin mRNA on the basis of its 3′UTR sequence. As in other species, the protein sequences of these isoforms are highly (〉93%) conserved, but the three mRNAs show significant divergence (13.8–16.5%) at silent nucleotide positions in their coding regions. A nucleotide region located toward the 5′ end shows significantly less divergence (5.6–8.7%) among the three mouse actin mRNAs; a second region, near the 3′ end, also shows less divergence (6.9%), in this case between the mouse β and αsk actin mRNAs. We propose that recombinational events between actin sequences may have homogenized these regions. Such events distort the calculated evolutionary distances between sequences within a species. Codon usage in the three actin mRNAs is clearly different, and indicates that there is no strict relation between the tissue type, and hence the tRNA precursor pool, and codon usage in these and other muscle mRNAs examined. Analysis of codon usage in these coding sequences in different vertebrate species indicates two tendencies: increases in bias toward the use of G and C in the third codon position in paralogous comparisons (in the order αc), and in orthologous comparisons (in the order chicken 〈 rodent 〈 man). Comparison of actin-coding sequences between species was carried out using the Perler method of analysis. As one moves backward in time, changes at silent sites first accumulate rapidly, then begin to saturate after −(30–40) million years (MY), and actually decrease between −400 and −500 MY. Replacements or silent substitutions therefore cannot be used as evolutionary clocks for these sequences over long periods. Other phenomena, such as gene conversion or isochore compartmentalization, probably distort the estimated divergence time.
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    Primary structures of the 5S ribosomal RNAs of 11 arthropods and applicability of 5S RNA to the study of metazoan evolution (1986)
    Springer
    Journal of molecular evolution 24 (1986), S. 103-109 
    Details
    ISSN: 1432-1432
    Keywords: Evolution ; 5S Ribosomal RNA sequences ; Arthropoda ; Secondary structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 5S Ribosomal RNA sequences have proven to be useful tools in the study of evolutionary relationships among species. However, in reviewing previously published trees constructed from alignments of metazoan 5S RNAs, we noticed several discrepancies with classical evolutionary views. One such discrepancy concerned the phylum Arthropoda, where a crustacean,Artemia salina, seemed to be evolutionarily very remote from four insects. The cause of this phenomenon was studied by determining the 5S RNA sequences of additional arthropods, viz.Limulus polyphemus, Eurypelma californica, Lasiodora erythrocythara, Areneus diadematus, Daphnia magna, Ligia oceanica, Homarus gammarus, Cancer pagurus, Spirobolus sp.,Locusta migratoria, andTenebrio molitor. A tree was then constructed from a dissimilarity matrix by a clustering method known as weighted pair grouping. Application of a correction for unequal evolutionary rates improved the apparent evolutionary position of the arthropods and of some other metazoan species. However, neither the uncorrected nor the corrected tree permitted a completely acceptable reconstruction of metazoan evolution. We presume that this phenomenon is due to random deviations in the evolutionary rate of 5S RNA.
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    Evolutionary role of posttranslational modifications of proteins, as illustrated by the glycosylation characteristics of the digestive enzyme pancreatic ribonuclease (1986)
    Springer
    Journal of molecular evolution 24 (1986), S. 118-120 
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    ISSN: 1432-1432
    Keywords: Glycoprotein ; Evolution ; Ribonuclease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The glycosylation characteristics of the digestive enzyme ribonuclease are summarized. The evolutionary role of this posttranslational modification is discussed and evidence is presented that selection has much influence on the presence or absence of carbohydrate in glycoproteins and on the positions of the carbohydrate attachment sites.
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    Hybridization homology: A new parameter for the analysis of phylogenetic relations, demonstrated with the urkingdom of the archaebacteria (1986)
    Springer
    Journal of molecular evolution 24 (1986), S. 167-173 
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    ISSN: 1432-1432
    Keywords: Ribosomal RNAs ; Cross-hybridization ; Hybridization yield ; Fractional hybridization ; Hybridization homology ; Phylogenetic tree ; Phylogeny ; Evolution ; Archaebacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ribosomal RNAs of 17 species of archaebacteria were hybridized to corresponding and non-corresponding nitrocellulose bound DNAs. The temperature stability of these hybrids and the amount of bound rRNA were determined. A formula was derived to correct the hybridization yields for the different genome lengths and numbers of rRNA operons per genome. This correction made it possible to determine hybridization homologies, as functions of velocity constants, which could then be used in a similar way as sequence homologies. The results were consistent with those from 16S rRNA total sequence data. No correlation was found between the hybridization homologies and the temperature stabilities of the hybrids. This new method is faster and simpler than the method based on total 16S rRNA sequence determination although it provides less total information. Its application to archaebacterial phylogeny has shown theThermococcales to represent a third branch of the kingdom beside the branch of the methanogens + halophiles, and that of theThermoproteales + Sulfolobales. The method has also provided a detailed description of the phylogeny of theSulfolobales showing their origin within theThermoproteales.
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    Receptors for intercellular messenger molecules in microbes: Similarities to vertebrate receptors and possible implications for diseases in man (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 782-788 
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    ISSN: 1420-9071
    Keywords: Evolution ; receptors ; plant hormones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
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    URL: http://dx.doi.org/10.1007/BF01941525
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    Structure and evolution of the small subunit ribosomal RNA gene of Crithidia fasciculata (1986)
    Springer
    Current genetics 10 (1986), S. 405-410 
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    ISSN: 1432-0983
    Keywords: Crithidia fasciculata ; rRNA ; Sequence ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We present the cloning and sequence analysis of the nuclear-encoded Crithidia fasciculata small subunit (SSU) rRNA gene, the longest (2,206 bp) such gene yet characterized by direct sequence analysis. Much of the sequence can be folded to fit a phylogenetically conserved secondary structure model, with the additional length of this gene being accommodated within discrete variable domains that are present in eukaryotic SSU rRNAs. On the basis of sequence comparisons, we conclude that Crithidia contains the most highly diverged SSU rRNA described to date among the eukaryotes, and therefore represents one of the earliest branchings within the eukaryotic primary kingdom.
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    Thermotoga maritima sp. nov. represents a new genus of unique extremely thermophilic eubacteria growing up to 90°C (1986)
    Springer
    Archives of microbiology 144 (1986), S. 324-333 
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    ISSN: 1432-072X
    Keywords: Evolution ; Eubacteria ; Thermophile ; Anaerobe ; Thermotoga maritima
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A novel type of bacterium has been isolated from various geothermally heated locales on the sea floor. The organisms are strictly anaerobic, rod-shaped, fermentative, extremely thermophilic and grow between 55 and 90°C with an optimum of around 80°C. Cells show a unique sheath-like structure and monotrichous flagellation. By 16S rRNA sequencing they clearly belong to the eubacteria, although no close relationship to any known group could be detected. The majority of their lipids appear to be unique in structure among the eubacteria. Isolate MSB8 is described as Thermotoga maritima, representing the new genus Thermotoga.
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    Differences in amino acid sequence of the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase from two species of Dasycladaceae (1986)
    Springer
    Planta 169 (1986), S. 575-582 
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    ISSN: 1432-2048
    Keywords: Acetabularia ; Acicularia ; Chlorophyta ; Chloroplast genome ; Dasycladaceae ; Evolution ; Ribulose-1,5-bisphosphate carboxylase (conservatism)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In contrast to other plants the plastid genome of Acetabularia is larger in size and shows a high degree of variability. This study on the chloroplast-encoded large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase demonstrates that strongly conserved areas also exist in the plastid genome of the Dasycladaceae. Searching for differences in the amino acid sequence of the large subunit from Acetabularia mediterranea and Acicularia schenckii, proteolytic peptides which differ in their elution behaviour in reverse-phase high-performance liquid chromatography were sequenced. Only six amino acids were found to be exchanged in the large subunit from these two species. Since these two species diverged approx. 150 million years ago, these results imply that 0.84 amino-acid exchanges per 100 amino acids have occurred in 108 years, underlining the strong conservatism of the large subunit.
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    Covered and naked barleys from the Himalaya (1986)
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    Theoretical and applied genetics 71 (1986), S. 730-735 
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    ISSN: 1432-2242
    Keywords: Barley ; Hordeum ; Himalaya ; Evolution ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Both reciprocal averaging and discriminant analysis confirm visual impressions that covered and naked barleys from several areas in the Himalaya differ significantly from each other in a multivariate way. Discriminant analysis also suggests similar differences between the ‘occidental’ and ‘oriental’ barleys of Takahashi (1955). Either distinction has implications for our understanding of barley phylogeny and evolution.
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    Genetic changes under domestication in Vicia faba (1986)
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    Theoretical and applied genetics 72 (1986), S. 364-372 
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    ISSN: 1432-2242
    Keywords: Inheritance ; Evolution ; Vicia faba ; Domestication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The components of variation within each one of two sets of landraces and/or cultivars of Vicia faba, respectively constituted of primitive and advanced morphological types, were studied by means of two sets of 8 × 8 diallel crosses with two repetitions. The results show that primitive and modern forms differ from each other in both the intensity and the kind of selective pressures acting on them, mainly on those characters more modified through the domestication process: i.e., seed morphology and the number of flowers per node. Because of the paramount importance of the additive component in the primitive forms, it is suggested that the most important type of selection on them is the stabilizing one. On the contrary, in the most advanced forms the selection is directional and disruptive : directional towards greater yields, and disruptive separating two morphological types, ‘major’ and ‘equina’. The plant response to these different selective pressures has been to modify the genetic control of different characters: thus the primitive forms generally show only additivity while the most advanced forms show additivity as well as directional and asymmetrical dominance.
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    Multiline varieties and disease control (1986)
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    Theoretical and applied genetics 71 (1986), S. 801-809 
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    ISSN: 1432-2242
    Keywords: Multiline varieties ; Disease control ; “Dirty crop” approach ; Evolution ; Pathogens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Existing theoretical models have led to conflicting predictions concerning the likely effect of the widespread use of dirty crop multilines on the evolution of virulence in pathogen populations. Here we attempt to clarify these problems by extending existing models to include selection against unnecessary genes for virulence at two different stages in the life cycle of the pathogen. The results of these studies indicate that the stage of the life cycle at which selection occurs can significantly influence the evolution of virulence in pathogen populations growing on multiline varieties.
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    Covered and naked barleys from the Himalaya (1986)
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    Theoretical and applied genetics 71 (1986), S. 736-741 
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    ISSN: 1432-2242
    Keywords: Barley ; Hordeum ; Himalaya ; Evolution ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Covered and naked barleys from the Himalaya differ significantly from each other in a multivariate way (Murphy and Witcombe 1986). Two hypotheses which could account for this phenomenon are (1) that the caryopsis covering gene (or a gene closely linked with it) exerts a wide-ranging pleiotropic effect, and (2) that the covered and naked types have evolved to differ with respect to the alleles fixed at many loci. Experimental evidence is presented which supports the latter, an explanation which has implications for our understanding of barley phylogeny and evolution.
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    Primary and secondary structural homologies between the HIS4 gene product of Saccharomyces cerevisiae and the hisIE and hisD gene products of Escherichia coli and Salmonella typhimurium (1986)
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    Molecular genetics and genomics 203 (1986), S. 389-396 
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    ISSN: 1617-4623
    Keywords: Histidinol dehydrogenase ; Hydropathy ; Translation ; Gene fusion ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A detailed comparative analysis of the Escherichia coli and Salmonella typhimurium hisIE and hisD gene products and the functionally equivalent, single, HIS4 gene product of Saccharomyces cerevisiae permitted several insights concerning the relationship between these genes. Our analysis supports the idea that HIS4 results from the fusion of hisIE and hisD. The comparison permitted a more precise definition of the functional domains of hisI/HIS4A and hisE/HIS4B as well as the two functional domains of hisD/HIS4C. The homologies between the bacterial and yeast sequences suggest a region of the hisD/HIS4C protein that may constitute one of the active centres. A large fragment at the amino terminal region of the yeast protein is missing from the bacterial hisIE gene product and is probably not needed for catalytic activity. Another region of non-homology in the yeast protein is probably a peptide bridge connecting the HIS4AB domain to HIS4C. Although the overall homology at the level of amino acid sequence is modest (about 38%) there is a striking similarity when the hydropathic patterns and predicted secondary structural configurations of these proteins are compared.
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    Chloroplast ATP synthase of spinach contains nine nonidentical subunit species, six of which are encoded by plastid chromosomes in two operons in a phylogenetically conserved arrangement (1986)
    Springer
    Molecular genetics and genomics 203 (1986), S. 117-128 
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    ISSN: 1617-4623
    Keywords: ATP synthase CF0 genes ; Plastid DNA ; Class II intron ; Evolution ; Spinach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We describe the nucleotide sequence of a 4.0 kilobase pair (kbp) region of the spinach plastid chromosome that encodes three subunits of the ATP synthase CF0 sector proximal to the gene for CF1 subunit alpha. The four genes are located on the same strand and form a transcriptional unit. Our study presents details about the genes and their products, resolves ambiguities in the constitution of the CF0 sector, and establishes precise gene-polypeptide relationships as well as intersubunit homologies in ATP synthases from diverse organisms. The amino acid sequences quences deduced exhibit substantial homology (30%–40%) with published sequences for the F0 subunits a, c (proteolipid) and b from E. coli and mitochondria, which therefore can be presumed to be structurally similar and functionally equivalent. Sequences comparison shows that the counterpart of CF0-I is F0-b. The homologue to the bacterial F0-a is CF0-IV, the product of a newly found gene, designated atpI. The data confirm our previous suggestion that the gene for subunit I, atpF, is split. The gene arrangement is atpI (247 codons)-692 bp spacer-atpH (proteolipid, 81 codons)-395 bp spacer-atpF (exon 1, 145 bp)-764 bp intron class II-atpI (exon 2, 410 bp)-65 bp spacer-atpA (alpha). The detection of atpI implies that the spinach CF0 sector contains four, the entire ATP synthase (CF0-CF1) nine different subunit species. The extra subunit in the membrane sector is the nuclear-encoded component CF0-II which has no known counterpart in E. coli. The six ATP synthase genes that are plastid-encoded are organized in two operons that map 40 kbp away from each other on the organelle chromosome. These transcriptional units, designated atp operons A and B, differ in their functional organisation. The plastid gene arrangement corresponds to the arrangement of genes in the atp (unc) operon of E. coli substantiating the theory that ATP synthase complexes have evolved from a common ancestor.
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    Phylogeny of chromosome races ofFestuca arundinacea andF. mairei (Poaceae) as indicated by seed protein electrophoresis (1986)
    Springer
    Plant systematics and evolution 152 (1986), S. 153-166 
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    ISSN: 1615-6110
    Keywords: Angiosperms ; Poaceae ; Festuca ; Evolution ; seed proteins ; electrophoresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seed protein electrophoresis of four chromosomes races ofFestuca arundinacea, F. mairei and their progenitors showed variation in banding patterns. High protein similarities betweenF. arundinacea, F. mairei, F. scariosa, andF. pratensis indicate close phylogenetic relationships of these species. The ancestry ofF. arundinacea cytotypes could be narrowed to three diploid species:F. scariosa, F. pratensis, andF. rubra or to their close relatives.
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    Assessing evolutionary epistemology (1986)
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    Biology and philosophy 1 (1986), S. 401-459 
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    ISSN: 1572-8404
    Keywords: Evolution ; epistemology ; selection ; analogy ; metaphor ; norms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Philosophy
    Notes: Abstract There are two interrelated but distinct programs which go by the name “evolutionary epistemology.” One attempts to account for the characteristics of cognitive mechanisms in animals and humans by a straightforward extension of the biological theory of evolution to those aspects or traits of animals which are the biological substrates of cognitive activity, e.g., their brains, sensory systems, motor systems, etc. (EEM program). The other program attempts to account for the evaluation of ideas, scientific theories and culture in general by using models and metaphors drawn from evolutionary biology (EET program). The paper begins by distinguishing the two programs and discussing the relationship between them. The next section addresses the metaphorical and analogical relationship between evolutionary epistemology and evolutionary biology. Section IV treats the question of the locus of the epistemological problem in the light of an evolutionary analysis. The key questions here involve the relationship between evolutionary epistemology and traditional epistemology and the legitimacy of evolutionary epistemology as epistemology. Section V examines the underlying ontological presuppositions and implications of evolutionary epistemology. Finally, section VI, which is merely the sketch of a problem, addresses the parallel between evolutionary epistemology and evolutionary ethics.
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    The human extensor digitorum profundus muscle with comments on the evolution of the primate hand (1986)
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    Primates 27 (1986), S. 293-319 
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    ISSN: 0032-8332
    Keywords: Forearm extensors ; Anthropoids ; Trisomy ; Ontogeny ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Forelimb dissections on 14 genera of anthropoids including humans and 17 cases of human aneuploids has revealed a high incidence of “atavistic” musculature (Barash et al., 1970;Aziz, 1981a) in the aneuploids. The phenotypic specificity of this aneuploid musculature clearly manifests developmental retardation and instability (Shapiro, 1983) revealing not only the likely course of embryonic myogenesis in chromosomally normal humans (Cihak, 1972, 1977) but also information relevant to ontogenetic and evolutionary changes. The extensor digitorum profundus proprius complex is particularly illustrative of these characteristics of aneuploid musculature. Our examination of the variation of this muscle complex in human aneuploids and between primate genera reveals how normal ontogeny may proceed, as well as the morphological basis for the evolutionary changes in hand structure and function amongst Primates. We also consider the phylogenetic and functional significance of changes in the extensor digitorum profundus proprius with reference to the divergent locomotory and manipulative capabilities and behavior of Primates.
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    Conservation of primary structure in the hisI gene of the archaebacterium, Methanococcus vannielii, the eubacterium Escherichia coli, and the eucaryote Saccharomyces cerevisiae (1986)
    Springer
    Molecular genetics and genomics 204 (1986), S. 133-140 
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    ISSN: 1617-4623
    Keywords: Archaebacterium ; Methanogen ; Sequence conservation ; Histidine ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A 2.7 kilobase pair (Kb) fragment of DNA, which complements mutations in the hisI locus of Escherichia coli, has been cloned and sequenced from the genome of the methanogenic archaebacterium Methanococcus vannielii. The cloned DNA directs the synthesis of three polypeptides, with molecular weights of 71,000, 29,000 and 15,600 in minicells of E. coli. Subcloning and mutagenesis demonstrates that hisI complementation results from the activity of the 15,600 molecular weight polypeptide. The primary structure of this archaebacterial gene and its gene product have been compared with the functionally equivalent gene and protein from the eubacterium E. coli (hisI) (Chiariotti et al. 1986) and from the eucaryote Saccharomyces cerevisiae (his4A) (Donahue et al. 1982). The DNA sequences of the archaebacterial and eubacterial genes are 40% homologous, the archaebacterial and eucaryotic DNA sequences are 47% homologous and, as previously reported (Bruni et al. 1986) the eubacterial and eucaryotic DNA sequences are 45% homologous. In E. coli the hisI locus is part of a bifunctional gene (hisI/E) within the single his operon. In S. cerevisiae the his4A locus is part of a multifunctional gene (his4) which encodes a protein with at least four enzymatic activities. The his genes of S. cerevisiae do not form an operon and are not physically linked. The M. vannielii hisI gene does not appear to be part of a multifunctional DNA sequence and, although it does appear to be within an operon, the open reading frames (ORFs) 5′ and 3′ to the M. vannielii hisI gene are not related to any published his sequences. The hisI and hisA genes (Cue et al. 1985) of M. vannielii are not closely linked in its genome.
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    Identification and comparisons of the yolk polypeptides and the genes which code for them in D. melanogaster sibling species (1986)
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    Molecular genetics and genomics 204 (1986), S. 302-309 
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    ISSN: 1617-4623
    Keywords: Drosophila ; Yolk polypeptides ; Yolk protein genes ; Evolution ; In situ hybridisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The yolk proteins stored in Drosophila, oocytes for utilisation during embryogenesis are an ideal system for studying the regulation of gene expression during development. The 3 major polypeptides found in yolk in D. melanogaster are synthesised in the fat body and ovarian follicle cells and selectively accumulated by the oocyte during vitellogenesis. In order to understand more about their regulation and the mechanism of uptake, studies on other species are necessary. Three yolk polypeptides have previously been identified in the D. melanogaster sibling species (D. melanogaster, D. simulans, D. mauritiana, D. erecta, D. teissieri, D. orena and D. yakuba). In D. melanogaster three genes located on the X chromosome are known to code for these yolk polypeptides. in this study genomic Southern transfers and in situ hybridisation experiments were carried out on the sibling species. Using the three cloned yolk protein genes from D. melanogaster, homologous sequences could be detected in the sibling species. It is suggested that three yolk protein genes occur in each of these species, all being located on the X chromosome, and that two of the genes are very closely linked in these same species. Yolk protein gene-homologous DNA sequences have also been identified in two more distantly related species D. funebris and D. virilis.
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    Early ontogeny of Adinia xenica (Pisces, Cyprinodontiformes): 3. Comparison and evolutionary significance of some patterns in epigenesis of egg-scattering, hiding and bearing cyprinodontiforms (1986)
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    Environmental biology of fishes 15 (1986), S. 91-105 
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    ISSN: 1573-5133
    Keywords: Fish epigenesis ; Ecology ; Evolution ; Embryonic arrest ; Hatching initiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Developmental patterns as seen in cyprinodontiforms fishes with different reproductive styles are compared, and discussed in relation to ecology and evolutionary significance. The discussion centres around Adinia xenica (its detailed ontogeny presented in two previous sequels to this paper), and, from the existing literature, Fundulus heteroclitus (closely related), Austrofundulus myersi (an annual) and Platypoecilus maculatus (a livebearer). The embryonic resting interval is present in various forms in the first three species, and differences in it and the overall patterns of development are shown to be consistent with ecological conditions. Termination of the resting interval leads immediately to hatching, a process in A. xenica, as in F. heteroclitus, apparently initiated by the appropriate summation of internal and external factors. These factors include any or all of: metabolic changes and increased oxygen requirements, response to light, reduced environmental oxygen, agitation, and increased hydrostatic pressure. They all can cause increased movement by the embryo which is credited with rupturing hatching gland cells and releasing the enzyme(s). Annual fishes experience 3 pronounced resting intervals, termed diapauses. These are discussed in the context of apparent steps and thresholds, and evolutionary ecology. A possible evolutionary sequence, from a simple fractional spawning pattern to diapause, is presented. Morphological differences in primary embryonic respiratory surfaces, as seen in the four species, are related to environmental conditions. The above illustrate ways in which the same basic structures and events are modified to cope with different habitats.
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    Absence of population subdivision in the common shiner, Notropis cornutus (Cyprinidae) (1986)
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    Environmental biology of fishes 15 (1986), S. 151-155 
    Details
    ISSN: 1573-5133
    Keywords: Esterases ; Evolution ; Starch gel electrophoresis ; Gene flow ; Schooling behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Starch gel electrophoresis of the common shiner, Notropis cornutus, was used to determine if this species exhibits genotypic structuring. Specimens were collected from seven widespread localities representing three branches of a single river drainage. χ2 tests revealed no significant heterogeneity of Est-A electromorphs within or between localities except where physical barriers prevent contact. Therefore, schooling behavior of N. cornutus is not associated with significant genotypic structuring of this species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005431
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  • 58
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    Electronic Resource
    Types of feeding in the ontogeny of fishes and the life-history model (1986)
    Springer
    Environmental biology of fishes 16 (1986), S. 11-24 
    Details
    ISSN: 1573-5133
    Keywords: Nutrient acquisition ; Life history ; Evolution ; Saltatory ontogeny ; Endogenous ; Absorptive ; Exogenous ; Mixed feeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Different types of ontogenies in fishes-indirect and direct- are correlated with different nutrient availability and feeding during early life history. A comprehensive life-history model, developed earlier, facilitates the understanding of decisive events in the life of an organism. Embryos with insufficient endogenous food supply (yolk) to build a definitive phenotype directly need the transient form of a nutrient-gathering larva. They represent an indirect development. In contrast, a large endogenous supply of nutrients enables the definitive adult phenotype to develop directly, avoiding an intervening larva and the cost of metamorphosis. The larger and more advanced an individual at the onset of exogenous feeding, the better are its chances to survive. This can be achieved by heterochronies related to feeding. Different types of feeding during the early ontogeny of fishes — endogenous, exogenous, absorptive, and a combination of all (mixed) — are demonstrated and integrated into the life-history model.
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    URL: http://dx.doi.org/10.1007/BF00005156
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  • 59
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    Electronic Resource
    Unique qualities and special problems of the African Great Lakes (1986)
    Springer
    Environmental biology of fishes 17 (1986), S. 161-183 
    Details
    ISSN: 1573-5133
    Keywords: Meromictic ; Evolution ; Diversity ; Cichlidae ; Productivity ; Aquatic reserves ; Flushing ; Pollution ; Fish introductions ; Lake development ; Limnology ; Fishery management ; Conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The African Great Lakes consist of large, deep rift valley lakes (e.g. Malawi & Tanganyika) and shallower lakes between the Eastern and Western Rifts (e.g. Victoria). They are a group comparable in size to the North American Great Lakes, but are old. Most are seasonally thermally stratified, and wind is the decisive factor that determines the annual cycle of cooling and mixing. Lakes Tanganyika, Malawi and Kivu are meromictic, with deep relict hypolimnia. Large magnitudes and time scales of periodic internal motion, where these have been measured, appear unique among lakes. These lakes harbour the world's richest lacustrine fish faunas, and the family Cichlidae provides the supreme example of geographically circumscribed vertebrate evolution. The lakes provide a unique comparative series of natural laboratories for evolutionary studies. Primary production is generally high, but in the deeper lakes standing stocks of plankton and of small fish species are low. These pelagic populations are characterised by very high P:B ratios. The fisheries are productive and of socio-economic importance. Large-scale mechanised fishing is not compatible with the survival of the diverse fish communities. Cichlids appear especially vulnerable to unselective fishing. Aquatic reserves might offer a means of survival for at least some communities. Various pollution threats exist. Because water retention times are long, extremely long for some deep lakes, and flushing rates are low, the lakes are vulnerable to pollution which would be long-lasting. Introductions of alien fishes have mostly had undesirable or disastrous results. While the faunas are one of the significant natural heritages of mankind, their conservation must realistically be linked to the legitimate development of the lakes for the well-being of the people who live there. Scientific value alone will not protect the lakes. Just as survival of African terrestrial wildlife in extensive reserves depends heavily upon tourism, so also might the cichlid flocks in underwater reserves. Greater interest from the international scientific community is needed to further rational development and conservation of these great lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002094
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  • 60
    Electronic Resource
    Electronic Resource
    Unique qualities and special problems of the African Great Lakes (1986)
    Springer
    Environmental biology of fishes 17 (1986), S. 161-183 
    Details
    ISSN: 1573-5133
    Keywords: Meromictic ; Evolution ; Diversity ; Cichlidae ; Productivity ; Aquatic reserves ; Flushing ; Pollution ; Fish introductions ; Lake development ; Limnology ; Fishery management ; Conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The African Great Lakes consist of large, deep rift valley lakes (e.g. Malawi & Tanganyika) and shallower lakes between the Eastern and Western Rifts (e.g. Victoria). They are a group comparable in size to the North American Great Lakes, but are old. Most are seasonally thermally stratified, and wind is the decisive factor that determines the annual cycle of cooling and mixing. Lakes Tanganyika, Malawi and Kivu are meromictic, with deep relict hypolimnia. Large magnitudes and time scales of periodic internal motion, where these have been measured, appear unique among lakes. These lakes harbour the world's richest lacustrine fish faunas, and the family Cichlidae provides the supreme example of geographically circumscribed vertebrate evolution. The lakes provide a unique comparative series of natural laboratories for evolutionary studies. Primary production is generally high, but in the deeper lakes standing stocks of plankton and of small fish species are low. These pelagic populations are characterised by very high P:B ratios. The fisheries are productive and of socio-economic importance. Large-scale mechanised fishing is not compatible with the survival of the diverse fish communities. Cichlids appear especially vulnerable to unselective fishing. Aquatic reserves might offer a means of survival for at least some communities. Various pollution threats exist. Because water retention times are long, extremely long for some deep lakes, and flushing rates are low, the lakes are vulnerable to pollution which would be long-lasting. Introductions of alien fishes have mostly had undesirable or disastrous results. While the faunas are one of the significant natural heritages of mankind, their conservation must realistically be linked to the legitimate development of the lakes for the well-being of the people who live there. Scientific value alone will not protect the lakes. Just as survival of African terrestrial wildlife in extensive reserves depends heavily upon tourism, so also might the cichlid flocks in underwater reserves. Greater interest from the international scientific community is needed to further rational development and conservation of these great lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00698196
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  • 61
    Electronic Resource
    Electronic Resource
    Oxygen consumption of Astyanax fasciatus (Characidae, Pisces): a comparison of epigean and hypogean populations (1986)
    Springer
    Environmental biology of fishes 17 (1986), S. 299-308 
    Details
    ISSN: 1573-5133
    Keywords: Metabolic rate ; Cavernicolous species ; Cave adaptation ; Evolution ; Starvation ; Mexico
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The standard and routine oxygen consumptions of Astyanax fasciatus from one surface population (Rio Teapao) and three cave populations (Chica, Micos and Pachon caves: ‘sAnoptichthys jordani’, the ‘Micosfish’ and ‘Anoptichthys antrobius’) were determined individually over 24 hours by the use of a flow-through respirometer and polarographic oxygen electrodes. The phylogenetically oldest Pachon fish had a significantly lower standard metabolic rate (0.230 ± 0.036 mg O2 g-1 h-1) than the epigean Teapao fish, the hybrid Chica fish and the phylogenetically younger Micos fish (0.314 ± 0.081 mg O2g--1h-1, 0.284 ± 0.048 mg O2g-1h-1, 0.277 ± 0.063 mg O2g-1h-1). No significant differences could be determined among the latter three populations. A significant difference in routine metabolic rate existed only between the Pachon fish (0.309 ± 0.0.56 mg O2g-1h-1) and the Teapao fish (0.415 ± 0.071 mg O2g-1h-1). The Chica fish (0.356 ± 0.084 mg O2g-1h-1) and the Micos fish (0.355 ± 0.080 mg O2 g-1h-1) could not be separated from either the Teapao or the Pachon fish, but a decreasing trend from the surface population through the Chica and the Micos to the Pachon population was obvious. During a starvation period of 29 days the metabolic rate of epigean Teapao and hypogean Pachon fish decreased significantly by 32.5% and 34.8% (standard oxygen consumption rate) and 27.5% and 28.2% (routine oxygen consumption rate), respectively. Body mass loss during the starvation period was 16.3% for the Teapao fish and 9.5% for the Pachon fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00001496
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