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  • Articles  (736)
  • evolution  (693)
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  • Springer  (697)
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  • Naturalis Biodiversity Center  (1)
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  • 101
    Electronic Resource
    Electronic Resource
    Metabolic pathways inParacoccus denitrificans and closely related bacteria in relation to the phylogeny of prokaryotes (1992)
    Springer
    Antonie van Leeuwenhoek 61 (1992), S. 1-33 
    Details
    ISSN: 1572-9699
    Keywords: Paracoccus denitrificans ; denitrification ; methylotrophy ; cytochromec ; cytochrome oxidase ; phylogeny ; evolution ; lateral gene transfer ; nitrogen fixation ; Thiosphaera pantotropha
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Denitrification and methylotrophy inParacoccus denitrificans are discussed. The properties of the enzymes of denitrification: the nitrate-nitrite antiporter, nitrate reductase, nitrite reductase, nitric oxide reductase and nitrous oxide reductase are described. The genes for none of these proteins have yet been cloned and sequenced fromP. denitrificans. A number of sequences are available for enzymes fromEscherichia coli, Pseudomonas stutzeri andPseudomonas aeruginosa. It is concluded that pathway specificc-type cytochromes are involved in denitrification. At least 40 genes are involved in denitrification. In methanol oxidation at least 20 genes are involved. In this case too pathway specificc-type cytochromes are involved. The sequence homology between the quinoproteins methanol dehydrogenase, alcoholdehydrogenase and glucose dehydrogenase is discussed. This superfamily of proteins is believed to be derived from a common ancestor. ThemoxFJGI operon determines the structural components of methanol dehydrogenase and the associatedc-type cytochrome. Upstream of this operon 3 regulatory proteins were found. The mox Y protein shows the general features of a sensor protein and the moxX protein those of a regulatory protein. Thus a two component regulatory system is involved in both denitrification and methylotrophy. The phylogeny of prokaryotes based on 16S rRNA sequence is discussed. It is remarkable that the 16S rRNA ofThiosphaera pantotropha is identical to that ofP. denitrificans. Still these bacteria show a number of differences.T. pantotropha is able to denitrify under aerobic circumstances and it shows heterotrophic nitrification. Nitrification and heterotrophic nitrification are found in species belonging to the β-and γ-subdivisions of purple non-sulfur bacteria. Thus the occurrence of heterotrophic nitrification inT. pantotropha which belongs to the α-subdivision of purple non-sulfur bacteria is a remarkable property. FurthermoreT. pantotropha contains two nitrate reductases of which the periplasmic one is supposed to be involved in aerobic denitrification. The nitrite reductase is of the Cu-type and not of the cytochromecd 1 type as inP. denitrificans. Also the cytochromeb of theQbc complex ofT. pantotropha is highly similar to its counterpart inP. denitrificans. It is hypothesized that the differences between these two organisms which both contain large megaplasmids is due to a combination of loss of genetic information and plasmid-coded properties. The distribution of a number of complex metabolic systems in eubacteria and in a number of species belonging to the α-group of purple non sulphur bacteria is reviewed. Two possibilities to explain this haphazard distribution are considered: 1. Lateral gene transfer between distantly related micro organisms occurs frequently. 2. The eubacterial ancestors must have possessed already these properties. The distribution of these properties is due to sporadic loss during evolutionary divergence. With respect to the occurrence and frequency of lateral gene transfer two opposing views exist. According to molecular biologists lateral gene transfer occurs frequently and is very easy. Bacteria are supposed to form one large gene pool. On the other hand population geneticists have provided evidence that strong systems operate that establish reproductive isolation between diverged species and even between closely related cell lines. Data on amino acid sequences of nitrogenase proteins, cytochromesc, cytochrome oxidases, β-subunits of ATP synthase and tryptophan biosynthetic enzymes of various micro organisms were reviewed. In all these cases phylogenetic trees could be constructed based on the amino acid sequence data. In all cases this phylogenetic tree was similar to the one based on 16S rRNA homology. Only in one case evidence for the occurrence of lateral gene transfer was obtained. Therefore it is concluded that lateral gene transfer played a minor role in the distribution of complex metabolic systems among prokaryotes. It must be stressed that this does not exclude the possibility that lateral gene transfer occurred frequently in the initial stage of bacterial evolution. It is hypothesized that the appearance of nitrogen fixation, denitrification and cytochrome oxidase formation were early events in the evolution of micro organisms. Both systems are supposed to have evolved only once. Subsequently the capacity to fix nitrogen or to denitrifymust have been lost many times, just as photosynthetic capacity is supposed to have been lost many times. During evolution many systems have been lost leading to a haphazard distribution of metabolic characters among bacteria. As an example it is suggested that organisms with a respiratory chain similar to that ofEscherichia coli arose by loss of the capacity to form the Qbc complex andc-type cytochromes. The remaining systems could be controlled much better however than in the ancestral organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572119
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  • 102
    Electronic Resource
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    Evolution of novel metabolic pathways for the degradation of chloroaromatic compounds (1997)
    Springer
    Antonie van Leeuwenhoek 71 (1997), S. 159-178 
    Details
    ISSN: 1572-9699
    Keywords: aromatic pathways ; chlorobenzenes ; evolution ; genes ; plasmids ; pseudomonas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chlorobenzenes are substrates not easily metabolized by existing bacteria in the environment. Specific strains, however, have been isolated from polluted environments or in laboratory selection procedures that use chlorobenzenes as their sole carbon and energy source. Genetic analysis indicated that these bacteria have acquired a novel combination of previously existing genes. One of these gene clusters contains the genes for an aromatic ring dioxy-genase and a dihydrodiol dehydrogenase. The other contains the genes for a chlorocatechol oxidative pathway. Comparison of such gene clusters with those from other aromatics degrading bacteria reveals that this process of recombining or assembly of existing genetic material must have occurred in many of them. Similarities of gene functions between pathways suggest that incorporation of existing genetic material has been the most important mechanism of expanding a metabolic pathway. Only in a few cases a horizontal expansion, that is acqui sition of gene functions to accomodate a wider range of substrates which are then all transformed in one central pathway, is observed on the genetic level. Evidence is presented indicating that the assembly process may trigger a faster divergence of nearby gene sequences. Further ‘fine-tuning’, for example by developing a proper regulation, is then the next step in the adaptation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000166400935
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  • 103
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    Evolution of bacterial genomes (1997)
    Springer
    Antonie van Leeuwenhoek 71 (1997), S. 265-270 
    Details
    ISSN: 1572-9699
    Keywords: bacteria ; DNA ; evolution ; genome ; RNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This review examines evolution of bacterial genomes with an emphasis on RNA based life, the transition to functional DNA and small evolving genomes (possibly plasmids) that led to larger, functional bacterial genomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000123216769
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  • 104
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    Bacterial evolution and metabolism (1997)
    Springer
    Antonie van Leeuwenhoek 71 (1997), S. 257-263 
    Details
    ISSN: 1572-9699
    Keywords: bacteria ; energy ; evolution ; genome ; metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This article examines the relationship between (or dependence of) bacterial evolution in prokaryotes and metabolism, and the changing physical-chemical conditions present during early evolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000175217677
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  • 105
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    Molecular evolution in bacteria: Surfaces, cathodes and anodes (1997)
    Springer
    Antonie van Leeuwenhoek 71 (1997), S. 363-368 
    Details
    ISSN: 1572-9699
    Keywords: assembly ; anode ; bacteria ; cathode ; DNA ; evolution ; genetics ; molecular ; surfaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Molecular evolution is examined in bacteria with an emphasis on mineral surfaces, membranes, cathodes and anodes. In early molecular evolution, cathode-anode system may have been naturally occurring on a nm to µm scale. Secondly, the cathode-anode system could have been separated by a primitive, permeable lipid or microsphere on a mineral surface, that was a precursor of a more advanced membrane with a charge differential on either side of the membrane. These aspects will be considered from a theoretical evolutionary perspective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000271219036
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  • 106
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    Molecular evolution and optimization (1997)
    Springer
    Antonie van Leeuwenhoek 72 (1997), S. 251-259 
    Details
    ISSN: 1572-9699
    Keywords: bacteria ; catalysis ; DNA ; enzyme ; evolution ; microorganisms ; optimization ; RNA ; time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Microbial populations (and life) not only evolve, they optimize. The transition from a random, unorganized, lifeless Earth to the present situation, where the Earth is virtually covered with nucleic acids and diverse and complex species, required numerous molecular changes and the integration of metabolic pathways over billions of years. Primitive prokaryotic life was dependent on and constrained by the physical-chemical conditions on the Earth, while slowly reshaping conditions present. In this review, molecular evolution and molecular optimization are examined with an emphasis on the order in which evolutionary events occurred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000456825081
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  • 107
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    A survey of equid mitochondrial DNA: Implications for the evolution, genetic diversity and conservation of Equus (2000)
    Springer
    Conservation genetics 1 (2000), S. 341-355 
    Details
    ISSN: 1572-9737
    Keywords: conservation genetics ; Equus ; evolution ; mitochondrial DNA control region ; mitochondrial 12S rRNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The evolution, taxonomy and conservation of the genus Equuswere investigated by examining the mitochondrial DNA sequences of thecontrol region and 12S rRNA gene. The phylogenetic analysis of thesesequences provides further evidence that the deepest node in thephylogeny of the extant species is a divergence between twolineages; one leading to the ancestor of modern horses (E.ferus, domestic and przewalskii) and the other to thezebra and ass ancestor, with the later speciation events of the zebrasand asses occurring either as one or more rapid radiations, or withextensive secondary contact after speciation. Examination of the geneticdiversity within species suggested that two of the E. hemionussubspecies (E. h. onager and E. h. kulan) onlyrecently diverged, and perhaps, are insufficiently different to beclassified as separate subspecies. The genetic divergence betweendomestic and wild forms of E. ferus (horse) and E.africanus (African ass) was no greater than expected within anequid species. In E. burchelli (plains zebra) there was anindication of mtDNA divergence between populations increasing withdistance. The implications of these results for equid conservation arediscussed and recommendations are made for conservation action.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011559200897
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  • 108
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    The evolution of pathways for aromatic hydrocarbon oxidation inPseudomonas (1994)
    Springer
    Biodegradation 5 (1994), S. 195-217 
    Details
    ISSN: 1572-9729
    Keywords: Aromatic catabolism ; by bacteria (Pseudomonas) ; evolution ; of catabolic pathways ; hydrocarbons ; catabolism of aromatic ; Pseudomonas ; evolution of catabolism in ; oxygenases ; evolution of
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The organisation and nucleotide sequences coding for the catabolism of benzene, toluene (and xylenes), naphthalene and biphenylvia catechol and the extradiol (meta) cleavage pathway inPseudomonas are reviewed and the various factors which may have played a part in their evolution are considered. The data suggests that the complete pathways have evolved in a modular way probably from at least three elements. The commonmeta pathway operons, downstream from the ferredoxin-like protein adjacent to the gene for catechol 2,3-dioxygenase, are highly homologous and clearly share a common ancestry. This common module may have become fused to a gene or genes the product(s) of which could convert a stable chemical (benzoate, salicylate, toluene, benzene, phenol) to catechol, thus forming the lower pathway operons found in modern strains. The upper pathway operons might then have been acquired as a third module at a later stage thus increasing the catabolic versatility of the host strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696460
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  • 109
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    Robert Chambers and Thomas Henry Huxley, Science Correspondents: The Popularization and Dissemination of Nineteenth Century Natural Science (1999)
    Springer
    Journal of the history of biology 32 (1999), S. 343-383 
    Details
    ISSN: 1573-0387
    Keywords: agnosticism ; Darwinian ; evolution ; materialism ; Malthusian ; nebular hypothesis ; popularization ; professionalization ; transitional forms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , History
    Notes: Abstract Robert Chambers and Thomas Henry Huxley helped popularize science by writing for general interest publications when science was becoming increasingly professionalized. A non-professional, Chambers used his family-owned Chambers' Edinburgh Journal to report on scientific discoveries, giving his audience access to ideas that were only available to scientists who regularly attended professional meetings or read published transactions of such forums. He had no formal training in the sciences and little interest in advancing the professional status of scientists; his course of action was determined by his disability and interest in scientific phenomena. His skillful reporting enabled readers to learn how the ideas that flowed from scientific innovation affected their lives, and his series of article in the Journal presenting his rudimentary ideas on evolution, served as a prelude to his important popular work, Vestiges of the Natural History of Creation. Huxley, an example of the new professional class of scientists, defended science and evolution from attacks by religious spokesmen and other opponents of evolution, informing the British public about science through his lectures and articles in such publications as Nineteenth Century. He understood that by popularizing scientific information, he could effectively challenge the old Tory establishment -- with its orthodox religious and political views -- and promote the ideas of the new class of professional scientists. In attempting to transform British society, he frequently came in conflict with theologians and others on issues in which science and religion seemed to contradict each other but refused to discuss matters of science with non-professionals like Chambers, whose popular writing struck a more resonant chord with working class readers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004616403134
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  • 110
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    Conventions and institutions in coordination problems (1996)
    Springer
    De economist 144 (1996), S. 397-428 
    Details
    ISSN: 1572-9982
    Keywords: conventions ; institutions ; game theory ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Summary This survey article starts with a game-theory interpretation of coordination problems that occur in an economy. Three types of games are discussed in which the degree of coordination versus conflict varies. It is shown that game-theoretic techniques for equilibrium selection or securing the highest pay-off outcome do not always suffice, which raises the need for exogenous information. Norms, such as conventions and institutions, may provide this information. The emergence and persistence of norms as well as the relationship between the type of game and the type of norm are discussed. After a discussion on conventions and rationality, some notions from Institutional Economics are introduced, in which institutions are explained as a way to deal with limited and costly information. Some applications are given in the last section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01682834
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  • 111
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    Last Judgment: The Visionary Biology of J. B. S. Haldane (2000)
    Springer
    Journal of the history of biology 33 (2000), S. 457-491 
    Details
    ISSN: 1573-0387
    Keywords: J. B. S. Haldane ; biology ; politics ; genetics ; evolution ; population genetics ; physiology ; Darwinism ; experimental biology ; eugenics ; Britain ; Russia ; India ; Soviet ; Communism ; socialism ; philosophy ; vision ; literature ; popularization ; religion ; human experimentation ; bioethics ; Venus ; Mars ; science fiction ; technocracy ; futurology ; H. G. Wells ; Julian Huxley ; Olaf Stapledon ; C. S. Lewis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , History
    Notes: Abstract This paper seeks to reinterpret the life and work of J. B. S. Haldane by focusing on an illuminating but largely ignored essay he published in1927, “The Last Judgment” – the sequel to his better known work, Daedalus (1924). This astonishing essay expresses a vision of the human future over the next 40,000,000 years, one that revises and updates Wellsian futurism with the long range implications of the “new biology” for human destiny. That vision served as a kind of lifelong credo, one that infused and informed his diverse scientific work, political activities, and popular writing, and that gave unity and coherence to his remarkable career.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004891323595
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  • 112
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    Sex, Death, and Evolution in Proto- and Metazoa, 1876–1913 (2000)
    Springer
    Journal of the history of biology 33 (2000), S. 221-246 
    Details
    ISSN: 1573-0387
    Keywords: August Weismann ; ciliates ; Clifford Dobell ; cytology ; death ; Emile Maupas ; evolution ; Herbert Spencer Jennings ; Otto Bütschli ; Paramecium ; rejuvenescence ; sex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , History
    Notes: Abstract In the period 1875–1920, a debate about the generality and applicability of evolutionary theory to all organisms was motivated by work on unicellular ciliates like Paramecium because of their peculiar nuclear dualism and life cycles. The French cytologist Emile Maupas and the German zoologist August Weismann argued in the 1880s about the evolutionary origins and functions of sex (which in the ciliates is not linked to reproduction), and death (which appeared to be the inevitable fate of lineages denied sexual conjugation), an argument rooted in the question of whether the ciliates and their processes where homologous to other cellular organisms. In the beginning of the twentieth century, this question of homology came to be less important as the ciliates were used by the British protozoologist Clifford Dobell and the American zoologist Herbert Spencer Jennings to study evolutionary processes in general rather than problems of development and cytology. For them, homology mattered less than analogy. This story illustrates two partially distinct problems in evolutionary biology: first, the question of whether all living things have common features and origins; and second, whether their history and current nature can be described by identical mechanisms. Where Maupas (contra Weismann) made the ciliates qualitatively the same as all other organisms in order to create a cohesive evolutionary theory for biology, Jennings and Dobell made them qualitatively different in order to achieve the same end.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004740325150
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  • 113
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    Progressive determination of cell fates along the dorsoventral axis in the sea urchin Heliocidaris erythrogramma (1994)
    Springer
    Development genes and evolution 204 (1994), S. 62-69 
    Details
    ISSN: 1432-041X
    Keywords: Cell determination ; direct development dorsoventral axis ; echinoids ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the direct-developing sea urchinHeliocidaris erythrogramma the first cleavage division bisects the dorsoventral axis of the developing embryo along a frontal plane. In the two-celled embryo one of the blastomeres, the ventral cell (V), gives rise to all pigmented mesenchyme, as well as to the vestibule of the echinus rudiment. Upon isolation, however, the dorsal blastomere (D) displays some regulation, and is able to form a small number of pigmented mesenchyme cells and even a vestibule. We have examined the spatial and temporal determination of cell fates along the dorsoventral axis during subsequent development. We demonstrate that the dorsoventral axis is resident within both cells of the two-celled embryo, but only the ventral pole of this axis has a rigidly fixed identity this early in development. The polarity of this axis remains the same in half-embryos developing from isolated ventral (V) blastomeres, but it can flip 180° in half-embryos developing from isolated dorsal (D) blastomeres. We find that cell fates are progressively determined along the dorsoventral axis up to the time of gastrulation. The ability of dorsal half-embryos to differentiate ventral cell fates diminishes as they are isolated at progressively later stages of development. These results suggest that the determination of cell fates along the dorsoventral axis inH. erythrogramma is regulated via inductive interactions organized by cells within the ventral half of the embryo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00744874
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  • 114
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    Polymorphism in the giant cocoa termite,Neotermes papua (Desneux) (1991)
    Springer
    Insectes sociaux 38 (1991), S. 263-272 
    Details
    ISSN: 1420-9098
    Keywords: Isoptera ; Kalotermitidae ; Neotermes papua ; termites ; caste differentiation ; division of labour ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The direct development ofNeotermes papua (Isoptera: Kalotermitidae) comprises four larval and three nymphal instars before the alate. The first five instars can be easily characterized. The second stage nymphs come morphologically close to the pseudergates, characterized by reduced wing buds. These nymphs can moult stationarily, i.e. with little morphological change, or to presoldiers, or proceed to the alate via the third nymphal stage. Pseudergates originate through a late and reversible deviation from the straight development to the alate. Presoldiers may derive from several stages, up to the last nymphal one; their production is subject to an inhibition by extant soldiers. This developmental schema is congruent with those described in other Kalotermitidae and the Termopsidae. By pinpointing the existence of a large pool of pluripotent individuals, in which the penultimate nymphal stage mingles with pseudergates, the present study also reveals a great similarity betweenNeotermes andProrhinotermes, and suggests that this developmental schema might be generally applicable to termites devoid of a permanent worker caste.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314912
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  • 115
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    Molecular cloning and sequencing of 18S rDNA gene fragments from six different ant species (1993)
    Springer
    Insectes sociaux 40 (1993), S. 325-335 
    Details
    ISSN: 1420-9098
    Keywords: Formicidae ; social parasitism ; PCR ; 18 S ribosomal RNA ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The evolutionary relationship between socially parasitic ants and their hosts is still an unsolved problem. We have compared a 1.2 kb sequence of the 18 S ribosomal RNA genes of the parasitic antsDoronomyrmex kutteri, Harpagoxenus sublaevis andChalepoxenus muellerianus to the sequence of the host speciesLeptothorax acervorum andL. recedens (all subfamily Myrmicinae, tribe Leptothoracini) and to an out-group antCamponotus ligniperda (Formicinae). We found that parasitic species and the host species and alsoCamponotus ligniperda differ at less than 1% of the base positions of the 1.2 kb segment of the 18S rRNA gene. The sequences showed 80.3% identity to the 18 S ribosomal RNA genes of the beetleTenebrio molitor and only 66.5% to that of the dipteranDrosophila melanogaster.
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    URL: http://dx.doi.org/10.1007/BF01242369
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  • 116
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    Development of non-reproductive castes in the neotropical termite generaCornitermes, Embiratermes andRhynchotermes (Isoptera, Nasutitermitinae) (1992)
    Springer
    Insectes sociaux 39 (1992), S. 313-324 
    Details
    ISSN: 1420-9098
    Keywords: Isoptera ; Termitidae ; Nasutitermitinae ; caste differentiation ; phylogeny ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The developmental pattern of the neuter castes was studied in the mandibulate nasute generaCornitermes, Embiratermes andRhynchotermes. InCornitermes walkeri, all the workers and soldiers are male. There are two larval and a single worker instar. Workers can molt into presoldiers. InEmbiratermes chagresi andRhynchotermes perarmatus, both sexes are present among the neuters. A slight sexual dimorphism (males 〉 females) is discernible among both larval instars and among workers ofE. chagresi; female workers can molt into presoldiers. InR. perarmatus, the sexual dimorphism is conspicuous from the first larval instar on. Male larvae go through two instars, then give rise to workers, which do not molt. InR. perarmatus, there is no worker stage in females, but a third larval instar, preceding the presoldier. Hypotheses are proposed as to the evolution of these caste patterns, attempting to conciliate present knowledge of Nasutitermitinae phylogeny and known evolutionary trends affecting termite caste patterns, according to the species' ecology.
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    URL: http://dx.doi.org/10.1007/BF01323951
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  • 117
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    On the elevated intestinal pH of higher termites (Isoptera: Termitidae) (1995)
    Springer
    Insectes sociaux 42 (1995), S. 57-69 
    Details
    ISSN: 1420-9098
    Keywords: Hindgut ; alkalinity ; evolution ; symbionts ; gut morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The pH of the gut contents was measured in 52 species of higher termites (Termitidae), representing 36 genera in all four subfamilies. A statistically significant trend was shown from lower termites with low mean gut pH through to the Termitinae with higher mean gut pHs. Elevation of the pH occurred principally in the first and third proctodaeal segments, reaching values as high as 10.5 in 8 soil-feeding genera and 1 wood-feeding genus of Termitinae. Elevation of gut pH within the Termitidae appears to be independent of the general nature of the feeding substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245699
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  • 118
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    Castes in humivorous and litter-dwelling neotropical nasute termites (Isoptera, Termitidae) (1996)
    Springer
    Insectes sociaux 43 (1996), S. 375-389 
    Details
    ISSN: 1420-9098
    Keywords: Nasutitermitinae ; Subulitermes ; Coatitermes ; Velocitermes ; evolution ; phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The developmental pathways of the neuter castes were studied in three species of Nasutitermitinae from central Panama. The humivorousSubulitermes denisae andCoatitermes clevelandi display several primitive traits: absence of sex dimorphism, representation of both sexes among workers and soldiers, and occurrence of successive worker instars. The litter-dwellingVelocitermes barrocoloradensis has a more complex caste system: female larvae are larger than males and give rise to the large workers, which constitute the bulk of the work force; male larvae proceed to soldiers through a small worker or a special larval instar. The resulting soldier caste is polymorphic. These results support previously formulated hypotheses regarding a link between humivorous diet and reduced polymorphism on the one hand, and between forest-floor foraging and large continuous size variation among soldiers on the other. Whereas the caste systems ofSubulitermes andCoatitermes probably represent a primitive condition,Velocitermes shares derived traits withNasutitermes and the other fully nasute genera previously studied. I therefore hypothesize that ancestors with these advanced features may have spread from the neotropics and be at the origin of most nasute genera, including humivorous taxa, present in other regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01258410
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  • 119
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    Sequence comparisons of the internal transcribed spacer region of ribosomal genes support close relationships between parasitic ants and their respective host species (Hymenoptera: Formicidae) (1996)
    Springer
    Insectes sociaux 43 (1996), S. 53-67 
    Details
    ISSN: 1420-9098
    Keywords: Formicidae ; Leptothoracini ; Tetramoriini ; internal transcribed spacer ; social parasitism ; evolution ; phylogenetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A fragment of the internal transcribed spacer (ITS-1) adjacent to the 5.8S rRNA gene of 20 myrmicine ant species was sequenced. Sequence comparisons were carried out between 11 species of the tribe Leptothoracini, five species of the tribe Tetramoriini, three species of the tribe Solenopsidini and one species of the tribe Myrmicini. Additionally, the formicine antCamponotus ligniperda (tribe Camponotini) was analyzed as an outgroup species. Among all investigated species, the fragment had a variable length of ≈ 230–380 bp with only a few conserved sequence elements. The sequences of this fragment were perfectly identical within four palearctic populations ofLeptothorax acervorum indicating that intraspecific variation is rather low. Within the species of Tetramoriini (includingAnergates atratulus) 94.1% of sequence positions were identical, 95.6% within the species of theLeptothorax s.str.-group and 64.6% within the species of theMyrafant-group. Phylogenetic analysis reveals that the social parasitesHarpagoxenus sublaevis, Doronomyrmex goesswaldi, D. kutteri andD. pacis, Chalepoxenus muellerianus as well asStrongylognathus alpinus andTeleutomyrmex schneideri are most closely related to the groups of their respective host species, which generally confirms the taxonomical classifications of the subfamily Myrmicinae based on morphological criteria. The taxonomical positions of the speciesA. atratulus has as yet been uncertain, however, sequence comparison of the ITS-1 fragment leads to the conclusion thatA. atratulus rather belongs to the tribe Tetramoriini than to the Solenopsidini.
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    The reflection of water waves by shear currents (1977)
    Springer
    Pure and applied geophysics 115 (1977), S. 937-949 
    Details
    ISSN: 1420-9136
    Keywords: Waves ; Currents ; Reflection ; Caustics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The refraction and reflection of linear water waves entering a following jet-type current is considered. A short-wave asymptotic solution is presented and the reflection coefficient found. This varies continuously from zero when the waves are normal to the current to unity when they are very oblique to it. The trapping of waves by an opposing current is also considered.
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    URL: http://dx.doi.org/10.1007/BF00881217
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    Social organization in some primitive Australian ants. I.Nothomyrmecia macrops Clark (1992)
    Springer
    Insectes sociaux 39 (1992), S. 425-438 
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    ISSN: 1420-9098
    Keywords: Formicidae ; Nothomyrmecia ; evolution ; sociogram ; ethogram ; recognition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Results of laboratory-based ethological studies on twoNothomyrmecia macrops colonies with individually marked workers are reported. Interactive behavioural acts constituted less than 1% of all those recorded, revealing a strong tendency by the ants not to engage in social contact. Very few workers performed queen-directed acts. They stayed near the queen, though seldom in direct contact. Division of labour was otherwise barely apparent, except that some individuals showed a propensity to guard the nest entrance. No exchange of food was observed between workers, workers and queen, or adults and larvae (apart from worker placement of prey items with larvae). A queen fed from aDrosophila carcass retrieved from the nest floor, without assistance from workers. Systematic scanned observations confirmed levels of inactivity higher than previously observed in ants (comprising almost 2/3 of recorded behavioural acts). The time budget for activities directed toward the immature stages was the same in both colonies, and fluctuated during the circadian period. Non-nestmate larvae added to worker groups were more frequently licked than nestmate larvae, but this might not involve the particular recognition of nestmateversus non-nestmate brood. These observations support the hypothesis thatNothomyrmecia is primitively eusocial, and of special significance in myrmecology.
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    Structural characteristics of the mammalian spleen indicating storage and release of red blood cells. Aspects of evolutionary and environmental demands (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 159-163 
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    ISSN: 1420-9071
    Keywords: Spleen ; red pulp ; storage ; release ; morphology ; evolution ; structural characteristics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
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    URL: http://dx.doi.org/10.1007/BF02002608
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    Estrogens in insects (1984)
    Springer
    Cellular and molecular life sciences 40 (1984), S. 942-944 
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    ISSN: 1420-9071
    Keywords: Insect hormones ; estradiol ; estriol ; evolution ; sex hormones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Insects representing 5 different orders contain androgen and estrogen-like substances as determined by radioimmunoassay. Estradiol and estriol have been identified by gas chromatography-mass spectrometry. The presence of these steroids in insects suggests that the vertebrate sex hormones have an ancient evolutionary history.
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    On the evolution of the spleen (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 145-152 
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    ISSN: 1420-9071
    Keywords: Spleen ; evolution ; phylogeny ; ontogeny ; non-mammalian spleen ; mammalian spleen ; comparative macromorphology ; comparative micromorphology ; intralienal vessels ; extralienal vessels ; differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
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    URL: http://dx.doi.org/10.1007/BF02002606
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    A ‘missing link’ in the evolution of the egg pedicel in lacewings? (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 624-624 
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    ISSN: 1420-9071
    Keywords: Egg pedicel ; evolution ; lacewings ; Hemerobiidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Brown lacewing eggs (Planipennia: Hemerobiidae) glued to the top of hairs of maize leaves can be seen as an intermediary evolutionary step between depositing the egg directly on the substrate (as in most neuropteroid families) and the protective behavioral adaptation of depositing the egg on a long thin pedicel (as e.g. in the Chrysopidae).
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    A comparison of the activity of flight interneurones in locusts, crickets, dragonflies and mayflies (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 735-738 
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    ISSN: 1420-9071
    Keywords: Insect ; flight ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The activity patterns of interneurones in the flight systems of dragonflies and mayflies were investigated using standard intracellular recording and staining techniques, and were compared with those of crickets and locusts. The results show several basic similarities in the operation of a central motor pattern generator for flight in all four groups of insects. These similarities can be explained as resulting from conservative evolution of flight pattern generating circuitry within the central nervous system.
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    Problems and prospects in morphogenesis (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 633-637 
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    ISSN: 1420-9071
    Keywords: Morphogenesis ; evolution ; development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01941023
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    A cryptic intermediate in the evolution of chameleon tongue projection (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 697-700 
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    ISSN: 1420-9071
    Keywords: Lizard ; Chamaeleontidae ; Agamidae ; tongue ; feeding ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An incipient form of tongue projection occurs inPhrynocephalus helioscopus, a generalized agamid lizard. We argue that this condition represents a functional intermediate between typical lingual prehension and chamaeleontid tongue projection, and that tongue projection evolved in chameleons by augmentation of ancestral mechanisms still operating in related, generalized lizards.
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    URL: http://dx.doi.org/10.1007/BF01941032
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    The genetic code in mitochondria and chloroplasts (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 1117-1126 
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    ISSN: 1420-9071
    Keywords: Genetic code ; mitochondria ; evolution ; organelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The universal genetic code is used without changes in chloroplasts and in mitochondria of green plants. Non-plant mitochondria use codes that include changes from the universal code. Chloroplasts use 31 anticodons in translating the code; a number smaller than that used by bacteria, because chloroplasts have eliminated 10 CNN anticodons that are found in bacteria. Green plant mitochondria (mt) obtain some tRNAs from the cytosol, and genes for some other tRNAs have been acquired from chloroplast DNA. The code in non-plant mt differs from the universal code in the following usages found in various organisms: UGA for Trp, AUA for Met, AGR for Ser and stop, AAA for Asn, CUN for Thr, and possibly UAA for Tyr. CGN codons are not used byTorulopsis yeast mt. Non-plant mt, e.g. in vertebrates, may use a minimum of 22 anticodons for complete translation of mRNA sequences. The following possible causes are regarded as contributing to changes in the non-plant mt: directional mutation pressure, genomic economization, changes in charging specificity of tRNAs, loss of release factor RF2, changes in RF1, changes in anticodons, loss of lysidine-forming enzyme system, and disappearance of codons from coding sequences.
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    The fractal lung: Universal and species-related scaling patterns (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 251-254 
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    ISSN: 1420-9071
    Keywords: Bronchial tree ; evolution ; fractal ; lung airway ; morphogenesis ; renormalization group theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The mammalian lung exhibits features of a fractal tree: heterogeneity, self-similarity and the absence of a characteristic scale. The finite nature of the lung ultimately limits the range over which self-similarity scaling characteristics are applicable. However, generalization based on the scaling features of fractals, provides unique insight into geometric organization of anatomic structures. Furthermore, the mathematical theory of renormalization groups provides a description of the harmonically-modulated inverse power-law scaling observed for bronchial tree dimensions observed in different species. Compared to several mammalian species (dog, rat, hamster), the human lung shows marked differences in the phase of the harmonic modulation for both length and diameter measurements. These inter-species scaling differences suggest that evolutionary factors modify certain universal features of morphogenesis.
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    Endogenous synthesis of peptidoglycan in eukaryotic cells; a novel concept involving its essential role in cell division, tumor formation and the biological clock (1992)
    Springer
    Cellular and molecular life sciences 48 (1992), S. 921-931 
    Details
    ISSN: 1420-9071
    Keywords: Biological clock ; cell division cycle ; diaminopimelate ; evolution ; FSu ; lysine ; muramate ; muramyl dipeptide ; peptidoglycan ; sleep muropeptide ; tumor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Degradation products of peptidoglycan, the universal bacterial cell wall constituent, were previously found in animal tissues and urine. Reassessment and quantitative analysis of available data lead to an original concept, i.e. that eukaryotic cells synthesize peptidoglycan. We present a model in which this endogenously synthesized peptidoglycan is essential for the processes of eukaryotic cell division and sleep induction in animals. Genes for peptidoglycan metabolism, like those for lysine biosynthesis in plants, are probably inherited from endosymbiotic bacteria, the ancestors of mitochondria and chloroplasts. Corollaries of this concept, i.e. roles for peptidoglycan metabolism in tumor formation and in the biological clock, are supported by abundant evidence. We propose that many interactions between bacteria and eukaryotes are conditioned by their common genetic heritage.
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    Sex pheromones and attractants in the Eucosmini and Grapholitini (Lepidoptera, Tortricidae) (1996)
    Springer
    Chemoecology 7 (1996), S. 13-23 
    Details
    ISSN: 1423-0445
    Keywords: sex pheromone ; synergist ; antagonist ; mate recognition ; reproductive isolation ; chemotaxonomoy ; phylogeny ; evolution ; Lepidoptera ; Tortricidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The geometric isomers (E,E)-, (E,Z)-, (Z,E)-, and (Z,Z)-8,10-dodecadien-1-yl acetate were identified as sex pheromone components or sex attractants in the tribes Eucosmini and Grapholitini of the tortricid subfamily Olethreutinae. Species belonging to the more ancestral Tortricinae were not attracted. Each one isomer was behaviourally active in males ofCydia andGrapholita (Grapholitini), either as main pheromone compound, attraction synergist or attraction inhibitor. Their reciprocal attractive/antagonistic activity in a number of species enables specific communication with these four compounds.Pammene, as well as otherGrapholita andCydia responded to the monoenic 8- or 10-dodecen-1-yl acetates. Of the tribes Olethreutini and Eucosmini,Hedya, Epiblema, Eucosma, andNotocelia trimaculana were also attracted to 8,10-dodecadien-1-yl acetates, but several otherNotocelia to 10,12-tetradecadien-1-yl acetates. The female sex pheromones ofC. fagiglandana, C. pyrivora, C. splendana, Epiblema foenella andNotocelia roborana were identified. (E,E)- and (E,Z)-8,10-dodecadien-1-yl acetate are producedvia a commonE9 desaturation pathway inC. splendana. CallingC. nigricana andC. fagiglandana females are attracted to wingfanning males.
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    The accumulation of repetitive and evolutionary conservative RNA during frog embryonic development (1982)
    Springer
    Development genes and evolution 191 (1982), S. 1-4 
    Details
    ISSN: 1432-041X
    Keywords: Embryo ; RNA ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Frog embryo nuclear and cytoplasmic RNA populations, labeled in vivo and in vitro, were hybridized to, filterbound homologous and heterologous DNA. The transcription of homologous (frog) repetitive DNA into nuclear RNA decreases qualitatively during development while the transcription of heterologous (minnow, human) repetitive DNA into nuclear RNA remains relatively constant qualitatively. The diversity of homologous repetitive mRNA increases during development, but there is only a slight change in the diversity of heterologous repetitive mRNA transcripts. There is a marked restriction of transport of the heterologous RNA sequences to the cytoplasm at a later stage of development.
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    Progressive determination of cell fates along the dorsoventral axis in the sea urchin Heliocidaris erythrogramma (1994)
    Springer
    Development genes and evolution 204 (1994), S. 62-69 
    Details
    ISSN: 1432-041X
    Keywords: Cell determination ; direct development dorsoventral axis ; echinoids ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the direct-developing sea urchin Heliocidaris erythrogramma the first cleavage division bisects the dorsoventral axis of the developing embryo along a frontal plane. In the two-celled embryo one of the blastomeres, the ventral cell (V), gives rise to all pigmented mesenchyme, as well as to the vestibule of the echinus rudiment. Upon isolation, however, the dorsal blastomere (D) displays some regulation, and is able to form a small number of pigmented mesenchyme cells and even a vestibule. We have examined the spatial and temporal determination of cell fates along the dorsoventral axis during subsequent development. We demonstrate that the dorsoventral axis is resident within both cells of the two-celled embryo, but only the ventral pole of this axis has a rigidly fixed identity this early in development. The polarity of this axis remains the same in half-embryos developing from isolated ventral (V) blastomeres, but it can flip 180° in half-embryos developing from isolated dorsal (D) blastomeres. We find that cell fates are progressively determined along the dorsoventral axis up to the time of gastrulation. The ability of dorsal half-embryos to differentiate ventral cell fates diminishes as they are isolated at progressively later stages of development. These results suggest that the determination of cell fates along the dorsoventral axis in H. erythrogramma is regulated via inductive interactions organized by cells within the ventral half of the embryo.
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    Chemical defense of a primitive Australian bombardier beetle (Carabidae):Mystropomus regularis (1991)
    Springer
    Chemoecology 2 (1991), S. 29-34 
    Details
    ISSN: 1423-0445
    Keywords: defensive secretion ; hot secretion ; elytral flanges ; evolution ; benzoquinones ; hydrocarbons ; bombardier beetle ; Coleoptera ; Carabidae ; Paussinae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The Australian bombardier beetle,Mystropomus regularis, sprays a mixture of quinones (1,4-benzoquinone, 2-methyl-1,4-benzoquinone, 2-ethyl-1,4-benzoquinone) and hydrocarbons (principallyn-pentadecane). The defensive fluid ist generated explosively in two-chambered glands, and is ejected audibly and hot (maximal recorded temperature = 59°C).Mystropomus is a member of the paussoid lineage of bombardiers. In common with other members of the group, it has a pair of elytral flanges (flanges of Coanda), associated with the gland openings, that serve as launching guides for anteriorly-aimed ejections of spray. It is argued thatMystropomus may be the least derived of flanged paussoids, and the closest living relative of the most primitive of extant bombardiers (Metriini).
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    Wound currents and wound healing in the newt, Notophthalmus viridescens (1990)
    Springer
    Development genes and evolution 198 (1990), S. 355-362 
    Details
    ISSN: 1432-041X
    Keywords: Wound healing ; Currents ; Electric fields ; Newt ; Epithelization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Wounded amphibian skin heals initially by a migration of epithelial cells from the cut edge towards the center of the wound. The density of currents leaving wounds made in Notophthalmus viridescens skin was manipulated in order to determine whether electrical fields associated with these currents might have a significant role in promoting this cell migration during wound healing. Wounds were made with either a needle (200 μm) or a biopsy punch (500 μm). Currents leaving the wounds were measured with a vibrating probe, and the wounds fixed at various times after wounding. When the Na+-dependent currents were reduced by blocking Na+ channels with benzamil, wound healing, as revealed by scanning electron microscopy and by paraffin histology, was impaired. These results are consistent with the hypothesis that there is an electrical component to wound healing.
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    Sex determining mechanisms: An evolutionary perspective (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1285-1296 
    Details
    ISSN: 1420-9071
    Keywords: Sex ; sex determination ; sex ratio ; evolution ; animals ; genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Theories on the evolution of sex determining mechanisms are reviewed for male and female heterogamety, environmental sex determination, and briefly, haplo-diploidy and hermaphroditism. Because of their discrete and well-defined nature, sex determining mechanisms lend themselves to three types of evolutionary questions:what variety occurs and might be expected but does not occur,how do changes occur from one mechanism to another, andwhy do certain changes occur? All three approaches were illustrated for these different sex determining mechanisms. A generality emerging from these studies is that, at the level of selection on the sex ratio, there are no intrinsic problems in evolving from one sex determining mechanism to another: straightforward transitions between different mechanisms exist under various conditions.
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    Phosphoglycerate mutase isozymes in the lower vertebrates (1985)
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    Cellular and molecular life sciences 41 (1985), S. 1471-1472 
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    ISSN: 1420-9071
    Keywords: Phosphoglycerate mutase isozymes ; evolution ; gene duplication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The phosphoglycerate mutase isozyme patterns from cyclostomata, cartilaginous and bony fish were analyzed. The observed patterns indicate that a duplication of a single ancestral gene coding for phosphoglycerate mutase took place during the evolution of the gnathostome vertebrates.
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    Development of hormone receptors: Conclusion (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 788-794 
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    ISSN: 1420-9071
    Keywords: Electrostatic complementation ; evolution ; genetic code ; hydropathic complementation ; receptor imprinting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
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    URL: http://dx.doi.org/10.1007/BF01941526
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    Metabolic iteration, evolution and cognition in cellular proliferation (1987)
    Springer
    Cellular and molecular life sciences 43 (1987), S. 1094-1099 
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    ISSN: 1420-9071
    Keywords: Cognitive processes ; metabolism ; evolution ; biomathematical models ; cell proliferation ; cell growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A model for cellular proliferation is described according to which proliferation ensues when metabolism evolves towards commitment to DNA synthesis, and inhibition of proliferation occurs when enzymic interactions are iterated within a few metabolic pathways, another limiting factor being the supply of metabolites. The model successfully describes cellular growth and division as a ‘cognitive process’ based on interaction within enzymic elements and the genome, and affords an explanation in these terms of some empirical phenomena which have previously been understood only as isolated observations.
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    Implications of toxins in the ecology and evolution of plant pathogenic microorganisms: Bacteria (1991)
    Springer
    Cellular and molecular life sciences 47 (1991), S. 791-803 
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    ISSN: 1420-9071
    Keywords: Phytotoxins ; ecology ; phylogeny ; evolution ; biosynthesis ; coronatine ; phaseolotoxin ; rhizobitoxine ; syringomycin ; syringotoxin ; syringostatin ; tabtoxin ; tagetitoxin ; tropolone ; fireblight toxin ; thaxtomin ; 3-methylthiopropionic acid ; carboxylic acids ; Pseudomonas ; Xanthomonas ; Xanthomonas ; Streptomyces ; Erwinia ; Bradyrhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract This review attempts to rationalise what is known about bacterial phytotoxins and associate it with the ecology and possible evolution of the producing organisms. Study of non-toxin producing variants gives insight into the ecological role of the toxin. Elucidation of chemical structures of phytotoxins has shown that many exist as families of analogous compounds. Studies on the variation of chemical structures and how they are distributed across species and genera can lead to development of hypotheses on evolutionary relationships. Knowledge on biosynthetic pathways to tosins allows recognition of specific enzymatic steps involved in developing the characteristic features of the structures. Phytotoxins often have a potent biochemical activity, and in some cases the producing organism has associated mechanisms to prevent action of the toxin upon itself; in such cases toxigenesis is clearly not a chance event. The various aspects of bacterial toxigenesis indicate that bacterial phytotoxins are special secondary metabolic products that play beneficial roles to the producing organisms in their various ecological niches.
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    The Light Green Cells ofLymnaea: A neuroendocrine model system for stimulus-induced expression of multiple peptide genes in a single cell type (1992)
    Springer
    Cellular and molecular life sciences 48 (1992), S. 464-473 
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    ISSN: 1420-9071
    Keywords: Molluscan insulin-related peptides ; schistosomin ; neuropeptide gene family ; generation of neuropeptide diversity ; stimulus-dependent expression ; information-handling capacity ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We review recent experiments showing that the cerebral neuroendocrine Light Green Cells (LGCs) of the freshwater snail,Lymnaea stagnalis, express a family of distinct though related molluscan insulin-related peptide (MIP) genes. The LGCs are involved in the regulation of a wide range of interrelated life processes associated with growth, (energy) metabolism and reproduction. We consider the mechanism of generation of diversity among MIPs, and present evidence that conditions with distinct effects on growth, metabolism and reproduction also can induce distinct patterns of expression of the MIP and schistosomin genes. The stimulus-dependent expression of multiple neuropeptide genes enormously increases the adaptive potential of a peptidergic neuron. We suggest that this contributes significantly to the information-handling capacity of the brain.
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    Parental care in terrestrial gastropods (1994)
    Springer
    Cellular and molecular life sciences 50 (1994), S. 5-14 
    Details
    ISSN: 1420-9071
    Keywords: parental investment ; juvenile survival ; evolution ; gastropods ; molluscs ; ovoviviparity ; viviparity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Parental care in terrestrial gastropods includes the of oviposition sites, production of large, heavily-yolked eggs supplied with calcium carbonate, provisioning of hatchings with eggs in specis with facultative sibling cannibalism, egg retention, and ovoviviparity. Evidence for true viviparity is scarce in terrestrial gastropods, as it is for postlaying care of eggs, though external egg carrying on the shell occurs in a few species. Care of young has not been observed in any terrestrial gastropod species. Provisioning of eggs with nutrients and calcium carbonate might be the most common form of parental investment. Ovoviviparity allows terrestrial gastropods to persist in habitats otherwise unsuitable for oviparous species (e.g. exposed rock walls). An interspecific comparison demonstrates that egg-retaining and ovoviviparous species produce smaller clutches than oviparous species and suggests a cost of parental care.
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    Evidence for an HLA-C-like locus in the orangutan Pongo pygmaeus (1999)
    Springer
    Immunogenetics 49 (1999), S. 865-871 
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    ISSN: 1432-1211
    Keywords: Key words Orangutan ; MHC class I ; HLA-C ; natural killer cells ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  HLA-B and C are related class I genes which are believed to have arisen by duplication of a common ancestor. Previous study showed the presence of orthologues for both HLA-B and C in African apes but only for HLA-B in Asian apes. These observations suggested that the primate C locus evolved subsequent to the divergence of the Pongidae and Hominidae. From an analysis of orangutan Tengku two HLA-C-like alleles (Popy C*0101 and Popy C*0201) were defined as well as three HLA-B-like (Popy-B) alleles. By contrast, no Popy-C alleles were obtained from orangutan Hati, although three Popy-B alleles were defined. Thus an HLA-C-like locus exists in the orangutan (as well as a duplicated B locus), implying that the primate C locus evolved prior to the divergence of the Pongidae and Hominidae and is at least 12–13 million years old. Uncertain is whether all orangutan MHC haplotypes contain a C locus, as the failure to find C alleles in some individuals could be due to a mispairing of HLA-C-specific primers with certain Popy-C alleles. These results raise the possibilities that other primate species have a C locus and that the regulation of natural killer cells by C allotypes evolved earlier in primate evolution than has been thought.
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    Fluctuation of body temperature and cuckoo brood parasitism (1995)
    Springer
    Ecological research 10 (1995), S. 321-325 
    Details
    ISSN: 1440-1703
    Keywords: body temperature ; brood parasitism ; cuckoo ; evolution ; telemetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Body temperatures of 11 bird species, including cuckoos, were measured in an artificial meteorological room. Ratios of change in body temperature to that in air temperature were thereby obtained for each species. Cuckoos demonstrate a remarkably high value, indicating a particularly low ability to regulate body temperature. Viewed in this light, the cuckoo's parasitic behavior is very likely an adaptation to overcome a physiological disadvantage. This in turn might be expected to reinforce delay in evolution of temperature homeostasis.
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    The ecology and evolution of bacteriocins (1996)
    Springer
    Journal of industrial microbiology and biotechnology 17 (1996), S. 151-158 
    Details
    ISSN: 1476-5535
    Keywords: bacteriocins ; colicins ; evolution ; ecology ; Escherichia coli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract In this review we focus on the ecological and evolutionary forces that determine the frequency and diversity of colicins inEscherichia coli. To begin, we describe that this killing phenotype is ubiquitous inE. coli, with as many as 50% of the isolates from a population producing colicin toxins, and that each population sampled has its own unique distribution of the more than 20 known colicin types. Next, we explore the dynamics of colicinogeny, which exhibits a typical form of frequency dependence, where the likelihood of successful colicin invasion into a population increases as the initial density of colicinogenic cells increases. We then incorporate thoughts on the evolution of chromosomal resistance to colicins and describe how resistance might influence the dynamics of colicinogen invasion and maintenance and the resulting colicin diversity. The final section deals with a genetic and phylogenetic characterization of colicins and a discussion of the evolutionary mechanisms responsible for generating colicin diversity. In this final section we provide details of the different molecular mechanisms known to play a role in generating colicin diversity, including the two most dominant forces in colincin evolution: recombination and positive, deversifying, selection.
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    The origin of life — A task in molecular engineering (1992)
    Springer
    Molecular engineering 1 (1992), S. 377-399 
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    ISSN: 1572-8951
    Keywords: Origin of life ; molecular engineering ; biology ; evolution ; genetic code ; translation machine ; self instruction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In attempting to understand how life originated, we search for a detailed sequence of experimentally testable physico-chemical steps in an appropriately structured system. This goal is approached in two stages. First we search for the organizational structure of processes leading to systems with the basic features of living organisms. This is an engineering problem: finding a certain construct by taking care of logical requirements and restrictions from physics. Then we face this construct with the chemical and geophysical reality, and this leads to the view that systems with the essential features of early living organisms evolve following a distinct pathway. Energy supply and the presence of a particular structure in space and time are necessary to induce and drive the processes triggered by stochastic events; but if these particular conditions are given, the broad line of the evolutionary processes is determined by logical requirements and by chemical and geophysical constrains and invariants. The genetic machinery considered to evolve in this manner agrees, in its organizational structure and in many details, with the actual genetic machinery of biosystems. A surprising simplicity and transparency is observed in the logic of the basic processes involved in the origin of life. In the present view, the processes leading to the origin of life begin in a very particular, highly structured, small region where the relevant chemistry can be quite different from overall prebiotic chemistry. Energy-rich compounds are present in ample amounts and a succession of physico-chemical processes, which are per se thermodynamically allowed, takes place. This is in contrast to popular views that the origin of life is connected with fundamental thermodynamic questions related to the problem of getting order out of chaos.
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    The evolution of the mammalian Y chromosome (1990)
    Springer
    Behavior genetics 20 (1990), S. 109-126 
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    ISSN: 1573-3297
    Keywords: Y chromosome ; DNA ; mammals ; evolution ; behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract There is a predominant theory for the evolution of the mammalian Y chromosome. This theory hypothesizes that genes for sex determination and male-specific traits, as well as sequences for X-Y meiotic pairing, are conserved on the mammalian Y chromosome across all lineages and that all other Y chromosomal genes or sequences have been or will be lost in each mammalian lineage. There are effects of mouse Y chromosomal genes on behaviors and other traits that are not male specific. Under the predominant theory, these Y chromosomal genes could be the same as the conserved genes for sex determination or malespecific traits, or they could be genes that have been lost from the Y chromosomes of other mammalian lineages and that will eventually be lost from the Y chromosome of the rodent lineage. Recently, the evolution of the primate and rodent Y chromosomes has been studied at the DNA level. These studies are summarized and reviewed in this article. The findings of these studies are not fully consistent with the predominant theory for the evolution of the mammalian Y chromosome. Also, they imply that there are other possibilities for the phylogenetic history of Y chromosomal genes of mice with effects on behavior. These are that Y chromosomal genes with effects on mouse behaviors or other traits could be conserved genes other than those for sex determination or malespecific traits or that they could be novel genes on the Y chromosome of the rodent orMus lineage.
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    Gene action in fish of tetraploid origin. I. Cellular and biochemical parameters in cyprinid fish (1975)
    Springer
    Biochemical genetics 13 (1975), S. 45-51 
    Details
    ISSN: 1573-4927
    Keywords: gene action ; polyploidy ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In phylogenetically diploid and tetraploid Cyprinid fish species, erythrocyte volumes, protein contents, and mean activities of the enzymes LDH, 6PGD, and PGI per cell per active gene locus decline with increasing DNA contents. These findings are assumed to reflect an evolutionary tendency of polyploids to regulate their genic activity down to the level of the diploids.
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    Free radicals in aging (1988)
    Springer
    Molecular and cellular biochemistry 84 (1988), S. 155-161 
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    ISSN: 1573-4919
    Keywords: aging ; free radicals ; antioxidants ; disease ; evolution ; longevity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Aging is the progressive accumulation of changes with time that are responsible for the ever-increasing likelihood of disease and death. These irreversible changes are attributed to the aging process. This process is now the major cause of death in the developed countries. This fact is obscured by the protean nature of the contributions of this process to the events which terminate life. The aging process may be due to free radical reations. This theory is supported by: 1) studies on the origin and evolution of life; 2) the numerous studies of the effect of ionizing radiation on living systems; 3) life span experiments in which the diet was modified so as to alter endogenous free radical reaction levels; 4) the plausible explanations it provides for aging phenomena; and 5) the growing number of studies which implicate free radical reactions in the pathogenesis of specific diseases. The relationship between aging and diseases involving free radical reactions seems to be a direct one. Modulation of the normal distribution of deleterious free radical reaction-induced changes throughout the body by genetic and environmental differences between individuals results in patterns of change, in some sufficiently different from the normal aging pattern to be recognized as disease. The growing number of ‘free radical’ diseases includes the two major causes of death, cancer and atherosclerosis. It is reasonable to expect on the basis of present data that a judicious selection of diets and antioxidant supplements will increase the healthy, active life span by 5–10 or more years.
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    Gene action in fish of tetraploid origin. II. Cellular and biochemical parameters in clupeoid and salmonoid fish (1975)
    Springer
    Biochemical genetics 13 (1975), S. 301-309 
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    ISSN: 1573-4927
    Keywords: cell size ; evolution ; gene action ; isoenzymes ; polyplodiy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract By use of cell size, protein and hemoglobin content, and enzyme activities as markers, it becomes apparent that in the course of evolution the gene expression of anciently tetraploid fish of the order Ostariophysi was diploidized, but no such regulatory mechanism has evolved in the phylogenetically tetraploid species of the order Isospondyli. This finding is discussed in terms of possible selective neutrality of tetraploid expression and the phylogenetic age of Isospondyli.
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    Gene action in fish of tetraploid origin. III. Ribosomal DNA amount in cyprinid fish (1976)
    Springer
    Biochemical genetics 14 (1976), S. 19-26 
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    ISSN: 1573-4927
    Keywords: evolution ; polyploidy ; ribosomal RNA genes ; cyprinid fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Phylogenetically diploid and tetraploid cyprinid fish species have cells of very similar volumes and protein contents. This finding has prompted us to postulate a regulatory system established during the evolution of the tetraploids leading to a diploid state of genic expression. It was proposed that this might be accounted for by a selective loss of ribosomal genes. RNA-DNA hybridization experiments, however, reveal a clear-cut 1:2 relationship of ribosomal DNA amounts between the diploid and the tetraploid species.
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    Gene action in fish of tetraploid origin. V. Cellular RNA and protein content and enzyme activities in cyprinid, clupeoid, and salmonoid species (1976)
    Springer
    Biochemical genetics 14 (1976), S. 975-980 
    Details
    ISSN: 1573-4927
    Keywords: evolution ; polyploidy ; RNA content ; protein content ; enzyme activities ; Cyprinidae ; Isospondyli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The ratio of cellular RNA and protein content is about 1:1 between phylogenetically diploid and tetraploid species of the teleost family Cyprinidae, but is roughly in proportion to ploidy in species of the teleost order Isospondyli. Enzyme activities do not unequivocally comply with this scheme. These findings are discussed in view of the hypothesis that a regulatory mechanism which reduces genic activity has evolved in the tetraploid cyprinids but not in the tetraploid species of the order Isospondyli.
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    Serum esterase genetics in rabbits. IV. The prealbumin and β-globulin systems (1977)
    Springer
    Biochemical genetics 15 (1977), S. 989-1000 
    Details
    ISSN: 1573-4927
    Keywords: genetics ; esterases ; evolution ; rabbit ; mouse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Discontinuous starch gel electrophoresis revealed a fourth allele of rabbit prealbumin serum esterase at locus Est-2. This allele is designated Est-2 f and appears to be silent. In addition to the prealbumin serum esterases, another serum esterase system was studied in rabbits. This system is localized in the β-globulin region. Genetic analysis indicated that one locus with two codominant alleles controls the variation in this region. Linkage of this system with Est-1 and Est-2 of the prealbumin serum esterases was demonstrated. Comparison of the arrangement of these esterase loci on linkage group VI with the esterase loci on chromosome 8 of the mouse gives additional support for the theory of evolutionary conservation of chromosomal segments coding for mammalian esterases.
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    Hidden breaks in ribosomal RNA of phylogenetically tetraploid fish and their possible role in the diploidization process (1983)
    Springer
    Biochemical genetics 21 (1983), S. 819-841 
    Details
    ISSN: 1573-4927
    Keywords: evolution ; polyploidy ; ribosomal RNA ; protein synthesis ; gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Hidden breaks occur in the ribosomal RNA of tetraploid Cyprinid fish such that the large ribosomal RNA (28 S) yields upon denaturation two RNA fragments of 8.7×105 and 5.0×105 daltons, whereas the small rRNA (18 S) yields fragments of 3.2×105 to 5.0×104 daltons. In tetraploid Cyprinids hidden breaks occur only in the rRNA of somatic tissue and not in oocytes and sperm cells. Hidden breaks can be detected only slightly in diploid Cyprinid species. Ribosomes purified from somatic tissue of tetraploid Cyprinids show a reduced efficiency in protein synthesis in vitro. The ribosomal proteins from diploid and tetraploid Cyprinid fish show considerable electrophoretic differences. This is discussed in light of a possible functional role of hidden breaks in rRNA in the process of diploidization of gene expression in tetraploid Cyprinid species.
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    Identification of the G-genome donor to Triticum timopheevii by DNA:DNA hybridizations (1985)
    Springer
    Biochemical genetics 23 (1985), S. 125-137 
    Details
    ISSN: 1573-4927
    Keywords: Triticum timopheevii ; Triticum speltoides ; G genome ; tetraploids ; evolution ; DNA hybridizations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In vitro DNA:DNA hybridizations and hydroxyapatite thermal-elution chromatography were employed to identify the diploid Triticum species ancestral to the G genome of Triticum timopheevii. Total genomic, unique-sequence, and repeated-sequence fractions of 3H-T. timopheevii DNA were hybridized to the corresponding fractions of unlabeled DNAs of T. searsii, T. speltoides, T. sharonensis, T. longissimum, and T. bicorne. The heteroduplex thermal stabilities indicated that, of the five species examined, T. speltoides was the most closely related to the G genome of T. timopheevii. Thus, T. spelotides appears to be the G-genome donor to T. timopheevii. The thermal stability profiles further indicated that the repeated DNA fractions from the five diploid species and the tetraploid T. timopheevii are more similar than the unique DNA fractions. This indicates that all of these species are closely related and that the sequences which comprise the current repeated fractions in the various species have not undergone any significant change since the formation of various species.
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    Aldehyde oxidases of Drosophila: Contributions of several enzymes to observed activity patterns (1981)
    Springer
    Biochemical genetics 19 (1981), S. 567-583 
    Details
    ISSN: 1573-4927
    Keywords: aldehyde oxidase ; Drosophila ; evolution ; gene regulation ; isozymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract At least four enzymes contribute to histochemically, electrophoretically, or spectrophotometrically detectable aldehyde oxidase (AO) activity in Drosophila melanogaster. The one we designate AO-1 contributes the majority of activity measured in extracts of whole flies. Pyridoxal oxidase (PO) is also a broad range AO. It is prominent only in midgut and Malpighian tubules, where it apparently accounts for a substantial fraction of total AO activity. The tissue distributions of these enzymes are clearly disparate despite close linkage of their structural loci and parallel dependence on the mal, lxd, and cin loci. A similarly related enzyme, xanthine dehydrogenase (XDH), is detected as an AO only in electrophoretic gels. A fourth broad range AO, not dependent on mal, lxd, and cin, is confined to the ejaculatory bulb. A similar array of AO isozymes is present in phylogenetically distant Drosophila species.
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    Mouse carbonic anhydrase III: Nucleotide sequence and expression studies (1989)
    Springer
    Biochemical genetics 27 (1989), S. 17-30 
    Details
    ISSN: 1573-4927
    Keywords: λgt11 ; evolution ; hormonal regulation ; myoblasts ; isoelectric focusing ; DNA polymorphism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A cDNA for the mouse carbonic anhydrase, CAIII, has been isolated from a λgt11 expression library. The cloned cDNA contains all of the coding region (777 bp) and both 5′ untranslated (86-bp) and 3′ untranslated (217-bp) sequences. The coding sequence shows 87% homology at the nucleotide level and 91% homology, when amino acid residues are compared, with human CAIII. Protein and mRNA analyses show that CAIII is present at low levels in cultured myoblasts and is abundant in adult skeletal muscle and in liver. The marked sex-related differences in CAIII distribution, described for rat liver, are not seen in the mouse. Restriction fragment length polymorphisms usingTaqI andPstI are described which distinguish betweenMus spretus andMus musculus domesticus.
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    Cereal prolamin evolution and homology revealed by sequence analysis (1982)
    Springer
    Biochemical genetics 20 (1982), S. 1039-1053 
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    ISSN: 1573-4927
    Keywords: cereal ; prolamin ; sequence ; homology ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Prolamin mixtures were isolated from oats, rice, normal and high-lysine sorghum, two varieties of pearl millet, two strains of teosinte, and gamma grass and subjected to NH2-terminal amino acid sequence determinations. In each case (except for rice, whose prolamins apparently have blocked or unavailable NH2-terminal residues), primarily a single sequence was observed despite significant heterogeneity, suggesting that prolamin homology in each cereal arose through duplication and mutation of a single ancestral gene. Comparisons were then made to prolamin sequences previously determined for wheat, corn, barley, and rye. Within genera, different varieties or subspecies exhibited few differences, but more distantly related genera, subtribes, and tribes showed increasingly large differences. Within the subfamily Festucoideae, no homology was apparent between prolamins of oats and those of the subtribe Triticinae (including wheat, rye, and barley, for which prolamin homology was previously demonstrated). Within the subfamily Panicoideae, corn was shown to be closely related to teosinte but more distantly to Tripsacum. Sorghum was shown to have diverged less from corn than had millet. These comparisons demonstrate that prolamin sequence analyses can successfully predict and clarify evolutionary relationships of cereals.
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    Evolution of the glycophorin gene family in the hominoid primates (1990)
    Springer
    Biochemical genetics 28 (1990), S. 209-222 
    Details
    ISSN: 1573-4927
    Keywords: glycophorin A ; glycophorin B ; evolution ; primates ; chimpanzee ; gorilla ; orangutan ; gibbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Analysis of nucleotide sequences of the human glycophorin A (GPA) and glycophorin B (GPB) genes has indicated that the GPA gene most closely resembles the ancestral gene, whereas the GPB gene likely arose from the GPA gene by homologous recombination. To study the evolution of the glycophorin gene family in the hominoid primates, restricted DNA on Southern blots from man, pygmy chimpanzee, common chimpanzee, gorilla, orangutan, and gibbon was probed with cDNA fragments encoding the human GPA and GPB coding and 3′-untranslated regions. This showed the presence in all of the hominoid primates of at least one GPA-like gene. In addition, at least one GPB-like gene was detected in man, both chimpanzee species, and gorilla, strongly suggesting that the event that produced the GPB gene occurred in the common ancestor of man-chimpanzee-gorilla. An unexpected finding in this study was the conservation ofEcoRI restriction sites relative to those of the other four enzymes used; the significance of this observation is unclear, but raises the question of nonrandomness ofEcoRI restriction sites in noncoding regions. Further analysis of the evolution of this multigene family, including nucleotide sequence analysis, will be useful in clarification of the evolutionary relationships of the hominoid primates, in correlation with the structure and function of the glycophorin molecules, and in assessment of the role of evolution in the autogenicity of glycophorin determinants.
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    Characterization and genetic control of the prolamins of Haynaldia villosa: Relationship to cultivated species of the Triticeae (rye, wheat, and barley) (1987)
    Springer
    Biochemical genetics 25 (1987), S. 309-325 
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    ISSN: 1573-4927
    Keywords: cereals ; seed proteins ; amino acid sequences ; genetics ; homology ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Haynaldia villosa is a wild grass of the tribe Triticeae, other members of which include the cultivated cereals barley, rye, and wheat. We have made an electrophoretic and chemical characterization of the major seed storage proteins (prolamins) of H. villosa and determined the chromosomal locations of the structural genes for some components using the available wheat/H. villosa chromosome addition lines. As in wheat, barley, and rye, groups of high molecular weight (polymeric), sulfur-poor (monomeric), and sulfur-rich (monomeric γ-type and polymeric) prolamins can be recognized. Most of the components are encoded by genes on chromosome 1 Ha, which is homologous with the chromosomes controlling many of the prolamins in wheat and rye and all of those in barley. In addition, H. villosa also contains α-type sulfur-rich prolamins, previously detected only in wheat and its close relatives. These may be encoded by genes on chromosome 6Ha, which is homologous with the group 6 chromosomes that control the α-type gliadins of wheat. Despite the proposed close relationship between Haynaldia and ryes, no evidence was found for the presence of proteins closely related to the M r 75,000 γ-secalins which are characteristic of wild and cultivated species of Secale.
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    Poly(ADP-ribose) polymerase: Structural conservation among different classes of animals and its implications (1994)
    Springer
    Molecular and cellular biochemistry 138 (1994), S. 25-32 
    Details
    ISSN: 1573-4919
    Keywords: NAD ; evolution ; polymerase chain reaction ; zinc finger ; leucine zipper
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Poly(ADP-ribose) polymerase cDNAs have been isolated from different classes of animals. Cloning of genes from lower eukaryotes has allowed us to investigate directly the biological functions of poly(ADP-ribosyl)ationin vivo. The conservation of specific regions among mammals, chicken,Xenopus laevis, andDrosophila melanogaster reveals the essential structural elements required for recognition of breaks in DNA and for catalytic activity. Cys, His and basic residues in the zinc-finger consensus region are conserved. The carboxyl terminal region corresponding to an NAD-binding domain is strongly conserved. The dinucleotide-binding consensus sequence and β1-αA-β2, Rossmann fold structure, and β-sheet structures are completely conserved from mammals to insect. InDrosophila, a putative leucine-zipper motif has been identified, and other poly(ADP-ribose) polymerases also contain an α-helical, amphipathic structure in the auto-modification domain. In this article, we review the recent structural analyses of the functional domains of poly(ADP-ribose) polymerase in phylogenetically divergent species, and discuss the implications of structural conservation for its biological functions.
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    Developmental specificity and evolution of the acid phosphatase isozymes of Triticum aestivum and its progenitor species (1976)
    Springer
    Biochemical genetics 14 (1976), S. 595-609 
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    ISSN: 1573-4927
    Keywords: Triticum ; acid phosphatase ; isozymes ; developmental genetics ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The tissue and developmental specificities of the acid phosphatase (ACPH) isozymes of Triticum aestivum and its progenitor species T. turgidum and T. tauschii have been determined and compared using the zymogram technique. Tissue and/or developmental variation in relative staining intensity, suggestive of variation in the quantity of active enzyme present, was observed for each of the seven major isozymes expressed. Isozymes homologous to each of the major isozymes of the hexaploid were detected in one or the other of the progenitor species. No difference in the pattern of developmental or tissue specificity was observed between the species for any isozyme. However, ACPH-4, encoded by Acph4, a structural gene linked to chromosome 4A, differs in electrophoretic mobility between T. aestivum and T. turgidum, indicating that divergence has occurred between these species at the Acph4 locus since the origin of the hexaploid. The molecular weight of each of five ACPH isozymes of the hexaploid was determined to be approximately 58,000. This finding, plus the results of the developmental study and the earlier demonstration that the structural genes for six isozymes (including four of those whose molecular weight was determined) are linked to homoeologous chromosomes, provides evidence in support of the suggestion that the ACPH structural genes of hexaploid wheat are homoeologously related.
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    The expression of creatine kinase isozymes in Xenopus tropicalis, Xenopus laevis laevis, and their viable hybrid (1985)
    Springer
    Biochemical genetics 23 (1985), S. 73-88 
    Details
    ISSN: 1573-4927
    Keywords: Xenopus ; creatine kinase ; isozymes ; gene duplication and regulation ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Starch gel electrophoresis of creatine kinase (CK) isozymes of Xenopus tropicalis shows that at least two different genes code for CK in this diploid (2n=20) species. These genes seem to be orthologous to the CK-A and CK-C genes of extant crossopterygian fish. Additional isozymes may be interpreted either as products of duplicate genes or, more probably, as epigenetically modified forms of the homodimers AtAt and CtCt, respectively. The originally tetraploid species X. laevis laevis (2n=36), which may have arisen by hybridization of diploid ancestors some 30–40 million years ago, has retained expression of all duplicate CK-A and CK-C genes. Differential expression during ontogenesis (CK-A genes) and in different adult tissues (CK-C genes) indicates that divergence occurred not only with respect to the primary sequence of these duplicate genes, but also with respect to the regulation of their expression. In the interspecific hybrid X. 1. laevis × X. tropicalis, all parental CK genes appear to be expressed simultaneously in the heart. However, several subunit combinations cannot be detected on the zymograms.
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    URL: http://dx.doi.org/10.1007/BF00499114
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    Immunogenetic study on the polymorphism of serum α2-lipoproteins in mink. IV. Diallelism at the Ld locus of low-density lipoprotein (1981)
    Springer
    Biochemical genetics 19 (1981), S. 997-1015 
    Details
    ISSN: 1573-4927
    Keywords: allotype ; gene ; low-density lipoprotein ; mink ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Antibodies against a new allotype, Ld2, of mink low-density lipoprotein (LDL) were obtained by alloimmunization with a preparation of this lipoprotein. The two known allotypes of LDL, designated Ld1 and Ld2, are coded for by codominant alleles of the autosomal Ld locus. This locus is probably involved in the genetic control of the whole serum pool of LDL molecules. In Ld 1 /Ld 2 heterozygotes, LDL is represented by two homozygous types of molecules, Ld1 and Ld2; it has no hybrid molecules bearing both allotypic specificities together. The results suggest that the Ld locus has, presumably, only two alleles in the mink populations studied. Mink LDL having allotypes Ld1 and Ld2 was found to be homologous to human and pig LDLs. Antigenic specificity of Ld1 allotype was established in the sera of a wide phylogenetic range of mammals and in the human LDL. The parallelism between the phylogenetic antiquity of the Ld 1 gene and its high frequency in mink and other species may be attributed to the selective value of this gene, which has been retained unaltered during macroevolution.
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    URL: http://dx.doi.org/10.1007/BF00504263
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    A fern spore storage protein is genetically similar to the 1.7 S seed storage protein ofBrassica napus (1988)
    Springer
    Biochemical genetics 26 (1988), S. 595-603 
    Details
    ISSN: 1573-4927
    Keywords: storage protein ; evolution ; napin ; matteuccin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The ostrich fern,Matteuccia struthiopteris L., contains two globulin spore storage proteins of 2.2 S and 11.3 S, with physical characteristics similar to those of seed storage proteins ofBrassica napus (rapeseed) andRaphanus sativus (radish). By the use of a cloned cDNA that encodes the 1.7 SB. napus storage protein (napin), gene sequences that hybridized with napin were detected in fern nuclear DNA, and a 900-nucleotide homologous mRNA was detected in developing spores.In vitro translation of this fern mRNA produced a 22-kD polypeptide comparable in size to the 21-kD precursor polypeptide identified inBrassica. No hybridizations were observed between theBrassica 12 S clone and either fern DNA or developing spore mRNA.
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    The Glycophorin A Gene Family in Gorillas: Structure, Expression, and Comparison with the Human and Chimpanzee Homologues (1997)
    Springer
    Biochemical genetics 35 (1997), S. 59-76 
    Details
    ISSN: 1573-4927
    Keywords: glycophorins ; gorilla ; evolution ; gene family ; gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Homologues of MN blood group antigens, encoded by members of the glycophorin A (GPA) gene family, are expressed in man, anthropoid apes, and some species of Old World monkeys. Previous studies had shown that a three-gene framework, most closely related to that in man, is present in the chimpanzee. Here we report the genomic structure, transcript map, and protein expression of the GYPA locus in gorillas. Compared to the corresponding human and chimpanzee homologues, gorilla GPA, GPB, and GPB/E genes each showed a high degree of sequence identity, with the same exon-intron organization. However, the expression of exons III, IV, or V encoding the extracellular or membrane domains of homologous glycophorins varied among the three species. Gorilla GPA and GPB/E genes were unique in that the former occurred in two allelic forms with or without the expression of exon III, whereas the latter contained one (ψ exon III) instead of two silenced exons (ψ exons III and IV). Differences from human but not chimpanzee GPA also included the presence of a hybrid M/N epitope and the absence of the sequon for N-glycosylation. Owing to the retention of a functional exon III, gorilla GPB was more similar to chimpanzee GPB than human GPB. A transspecies allele was identified in the gorilla that gave rise to the Henshaw (He)-like antigen similar to that found in man. These results provide further insight into the model for evolution of the GPA gene family, indicating that the mechanisms underlying inter- and intraspecific polymorphism of glycophorins could predate the divergence of gorillas as the consequence of gene duplication and diversification.
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    URL: http://dx.doi.org/10.1023/A:1022212630370
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    The gene coding for glutamate dehydrogenase inDrosophila melanogaster (1990)
    Springer
    Biochemical genetics 28 (1990), S. 337-346 
    Details
    ISSN: 1573-4927
    Keywords: glutamate dehydrogenase ; Drosophila melanogaster ; gene expression ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract We have isolated theDrosophila melanogaster locus coding forl-glutamate dehydrogenase (EC 1.4.1.3) by virtue of its similarity to the corresponding human gene. There is only one copy of this gene in the fruit fly genome, located on the right arm of chromosome 3 (95D1-4). The transcript includes at least one large intron and matures to a ∼2.4-kb-long polyadenylated RNA whose expression is under developmental control.
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    Multiple restriction fragment length polymorphisms associated with the Vc determinant of the MN blood group-related chimpanzee V-A-B-D system (1990)
    Springer
    Biochemical genetics 28 (1990), S. 223-231 
    Details
    ISSN: 1573-4927
    Keywords: restriction fragment length polymorphisms ; glycophorin A ; glycophorin B ; MN blood group ; V-A-B-D blood group ; Vc antigen ; chimpanzee ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Twelve restriction fragment length polymorphisms (RFLPs) were detected in common chimpanzee using two restriction enzymes (HindIII andMspI) and four DNA probes to the coding regions of the human glycophorin A (GPA) and glycophorin B (GPB) genes and their 3′-untranslated regions. Seven RFLPs correlated with red cell expression of the Vc determinant of the MN blood group-related V-A-B-D system and five RFLPs correlated with nonexpression of this antigen. Animals heterozygous for theV allele that encodes the Vc determinant had all 12 polymorphic restriction fragments and appeared to show reduced intensity of probe hybridization to these fragments, consistent with the presence of aV and a non-V allele. No RFLPs were detected withEcoRI,SstI, orBamHI, in spite of the relatively large segment of DNA (at least 20 kb) involved in the polymorphisms. The RFLPs were chimpanzee specific and were not found in man, gorilla, orangutan, or gibbon. Multiple RFLPs distinguishing primate species are rare and may be useful markers for molecular evolution.
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    Sequence homology and structure predictions of the creatine kinase isoenzymes (1994)
    Springer
    Molecular and cellular biochemistry 133-134 (1994), S. 245-262 
    Details
    ISSN: 1573-4919
    Keywords: creatine kinase ; arginine kinase ; protein sequence comparison ; evolution ; CK framework ; ‘diagnostic boxes’ ; secondary structure prediction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Comparisons of the protein sequences and gene structures of the known creatine kinase isoenzymes and other guanidino kinases revealed high homology and were used to determine the evolutionary relationships of the various guamidino kinases. A ‘CK framework’ is defined, consisting of the most conserved sequence blocks, and ‘diagnostic boxes’ are identified which are characteristic for anyone creatine kinase isoenzyme (e.g. for vertebrate B-CK) and which may serve to distinguish this isoenzyme from all others (e.g. from M-CKs and Mi-CKs). Comparison of the guanidino kinases by near-UV and far-UV circular dichroism further indicates pronounced conservation of secondary structure as well as of aromatic amino acids that are involved in catalysis.
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    URL: http://dx.doi.org/10.1007/BF01267958
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    Gene action in fish of tetraploid origin. IV. Ribosomal DNA amount in clupeoid and salmonoid fish (1976)
    Springer
    Biochemical genetics 14 (1976), S. 293-297 
    Details
    ISSN: 1573-4927
    Keywords: evolution ; polyploidy ; ribosomal RNA genes ; Isospondyli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Phylogenetically tetraploid species of the fish order Isospondyli generally have twice the mean ribosomal gene content as closely related species on the phylogenetically diploid level. Considerable intraspecific variation of rDNA amount was observed. These findings are discussed in view of the hypothesis that selective loss of ribosomal genes may account for diminishing genic activity in phylogenetically tetraploid organisms.
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    URL: http://dx.doi.org/10.1007/BF00484768
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    Coadaptation ofDrosophila and yeasts in their natural habitat (1986)
    Springer
    Journal of chemical ecology 12 (1986), S. 1037-1055 
    Details
    ISSN: 1573-1561
    Keywords: Drosophila ; Diptera ; Drosophilidae ; yeasts ; cactus ; community ecology ; mutualism ; coadaptation ; evolution ; alkaloids ; fatty acids ; sterols
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The mutualistic interactions of cactophilicDrosophila and their associated yeasts in the Sonoran Desert are studied as a system which has evolved within the framework of their host cactus stem chemistry. Because theDrosophila-yeast system is saphrophytic, their responses are not thought to directly influence the evolution of the host. Host cactus stem chemistry appears to play an important role in determining where cactophilicDrosophila breed and feed. Several chemicals have been identified as being important. These include sterols and alkaloids of senita as well as fatty acids and sterol diols of agria and organpipe cactus. Cactus chemistry appears to have a limited role in directly determining the distribution of cactus-specific yeasts. Those effects which are known are due to unusual lipids of organpipe cactus and triterpene glycosides of agria and organpipe cactus.Drosophilayeast interactions are viewed as mutualistic and can take the form of (1) benefits to theDrosophila by either direct nutritional gains or by detoxification of harmful chemicals produced during decay of the host stem tissue and (2) benefits to the yeast in the form of increased likelihood of transmission to new habitats. Experiments on yeast-yeast interactions in decaying agria cactus provide evidence that the yeast community is coadapted. This coadaptation among yeasts occurs in two manners: (1) mutualistic increases in growth rates (which are independent of the presence ofDrosophila larvae) and (2) stabilizing competitive interactions when growth reaches carrying capacity. This latter form is dependent on larval activity and results in benefits to the larvae present. In this sense, the coadapted yeast community is probably also coadapted with respect to itsDrosophila vector.
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    URL: http://dx.doi.org/10.1007/BF01638995
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    Cyanoglycoside gynocardin fromAcraea horta (L.) (Lepidoptera: Acraeinae) (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 2177-2189 
    Details
    ISSN: 1573-1561
    Keywords: Acraea horta ; Lepidoptera ; Acraeinae ; cyclopentenyl cyanoglycoside ; gynocardin ; Kiggelaria africana ; sequestration ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract All stages in the life cycle ofAcraea horta (L.) (Lepidoptera: Acraeinae) were found to release hydrogen cyanide (HCN) from their crushed tissues, and the source of cyanogenesis was present in the hemolymph of adults and larvae. Comparison with standards on thin-layer chromatograms (TLC) revealed the presence in adults of gynocardin, a cyclopentenyl cyanoglycoside also produced by the larval food plant,Kiggelaria africana L. (Flacourtiaceae). Analysis of adults reared on plant species (Passifloraceae) containing gynocardin and/or other cyanoglycosides suggested selective uptake of gynocardin by the larvae. This is the first demonstration of a cyanoglycoside, other than the acyclic linamarin and lotaustralin, occurring in Lepidoptera and the first evidence for the storage byAcraea butterflies of a plant-produced allelochemical. Possible implications for the understanding of the evolution of acraeine host choice are discussed.
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    Evolution of behavioral responses to sex pheromone in mutant laboratory colonies ofTrichoplusia ni (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 231-238 
    Details
    ISSN: 1573-1561
    Keywords: Trichoplusia ni ; Lepidoptera ; Noctuidae ; sex pheromone ; behavior ; evolution ; sexual selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Male cabbage looper moths,Trichoplusia ni, from two colonies in which all females express an abnormal sex pheromone production phenotype were evaluated in a laboratory wind tunnel for upwind flight responses to the normal and abnormal sex pheromones. The abnormal sex pheromone blend consisted of 20 times as much (Z)-9-tetradecenyl acetate and 30-fold less (Z)-5-dodecenyl acetate compared to the normal pheromone blend. Initially, these males exhibited poor behavioral responses to the abnormal sex pheromone and maximum responses to the normal pheromone blend, indicating that there was no linkage between signal production and response. After 49 generations of laboratory rearing, males from the mutant colonies maintained good responses to the normal pheromone and increased their behavioral response to the abnormal sex pheromone to the same levels as for the normal pheromone. Over the same period, normal males maintained their preference for the normal pheromone. These results indicated that evolution had occurred in mutant colonies in favor of greater male responsiveness to the abnormal sex pheromone, resulting in the broadening of the response spectrum to pheromone blend ratios. This evolution presumably resulted from a mating advantage to those males that did not discriminate against mutant-type females in the mutant colonies.
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    Identification of a novel moth sex pheromone inEriocrania cicatricella (Zett.) (Lepidoptera: Eriocraniidae) and its phylogenetic implications (1995)
    Springer
    Journal of chemical ecology 21 (1995), S. 29-43 
    Details
    ISSN: 1573-1561
    Keywords: Eriocrania cicatricella ; Eriocrania sparrmannella ; Eriocraniidae ; Lepidoptera ; sex pheromone ; EAG ; GC-EAD ; mass spectrometry ; synthesis ; evolution ; (Z)-4-hepten-2-one ; (2R)-heptan-2-ol ; (2R)-(Z)-4-hepten-2-ol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Extracts from different body parts of adult femaleEriocrania cicatricella (Zett.) were tested for electrophysiological activity on conspecific male antennae. Extracts from the Vth abdominal segment, containing a pair of exocrine glands, elicited the largest electroantennographic response when compared to extracts of other body parts. Female extracts were analyzed by gas chromatography with simultaneous flame ionization and electroantennographic detection (EAD). The EAD active peaks were identified as (Z)-4-hepten-2-one, (2R)-heptane-2-ol, and (2R)-(Z)-4-hepten-2-ol by coinjection on a gas chromatography and by comparison of mass spectra with those of synthetic standards. In field tests, a blend of these three pheromone components was highly attractive to conspecific males, and a subtractive assay confirmed that the unsaturated alcohol is the major pheromone component, whereas no definite behavioral activity could be assigned to the ketone or the saturated alcohol. A bait containing the two alcohols withS-configuration was attractive to maleE. sparrmannella (Bosc), whereas no males ofE. cicatricella were found in these traps. The sex pheromone compounds inE. cicatricella are chemically similar to pheromones reported in Trichoptera and they are produced in homologous glands.
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    Olefinic acetates, Δ-9,11–14: OAc and Δ-7,9–12: OAc used as sex pheromone components in three geometrid moths,Idaea aversata, I. straminata, andI. biselata (Geometridae, Lepidoptera) (1996)
    Springer
    Journal of chemical ecology 22 (1996), S. 1505-1526 
    Details
    ISSN: 1573-1561
    Keywords: Sex pheromone ; Idaea aversata ; Idaea straminata ; Idaea biselata ; (Z,Z)-9,11-tetradecadienyl acetate ; (Z,Z)-7,9-dodecadienyl acetate ; (Z,E)-7,9-dodecadienyl acetate ; Lepidoptera ; Geometridae ; electroantennography ; single cell recording ; biosynthesis ; phylogeny ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Pheromone compounds so far identified from most geometrid moths consist of all-Z diene, triene, or tetraene hydrocarbons with chain lengths of C17 to C21, and their monoepoxide derivatives biosynthesized from linoleic and linolenic acids. The present study reports the occurrence of olefinic acetates as sex pheromones in three species of Geometridae. (Z,Z)-9,11-tetradecadienyl acetate and (Z,Z)-7,9-dodecadienyl acetate found in female gland extracts ofIdaea aversata elicited significant responses from conspecific male antennae in gas chromatography with electroantennographic detection (GCEAD). In extracts ofI. straminata, (Z,Z)-7,9-dodecadienyl acetate, (E,Z)-7,9-dodecadienyl acetate, and (Z,Z)-7,9-dodecadienyl acetate were found, and the synthetic compounds elicited strong responses from conspecific male antennae. In the third species,I. biselata, only (Z,Z)-7,9-dodecadienyl acetate was found in the female extracts, and this compound elicited a strong EAD response from the conspecific male antenna. The identities of the pheromone components inI. aversata andI. straminata were further confirmed according to their characteristic ions after GC-MS analyses. Single sensillum recordings fromI. aversata showed two types of pheromone-detecting sensilla present on the male antenna. One type contained two receptor neurons, one of which was specifically tuned to (Z,Z)-9,11-tetradecadienyl acetate, the other to (Z,E)-9,11-tetradecadienyl acetate. A second type contained one neuron responding to (Z,Z)-7,9-dodecadienyl acetate. The two types were clearly different also with respect to external morphology, the former being considerably longer and having a larger base diameter. Also inI. straminata two physiological types of sensilla could be distinguished. One type contained two neurons, one of which responded to (Z,Z)-7,9-dodecadienyl acetate, the other to (Z,E)-9,11-tetradecadienyl acetate. The second type contained one neuron, responding to (Z,Z)-7,9-dodecadienyl acetate. No correlation between external morphology and physiological response of the investigated sensilla was observed inI. straminata. In field tests, a two-component blend containing (Z,Z)-9,11-tetradecadienyl acetate and (Z,Z)-7,9-dodecadienyl acetate in a ratio of 10:1 was attractive to males ofI. aversata. This two-component blend was also attractive to males ofI. straminata, but in a ratio of 1:1. High numbers of maleI. biselata were caught in traps baited with (Z,Z)-7,9-dodecadienyl acetate alone. The incorporation of deuterium labels into pheromone components after topical application of deuterium-labeled palmitic acid confirmed that the pheromone components ofI. aversata could be synthesized from this precursor, as has been previously observed for acetate pheromone components of many other moth species. Our results suggest that an evolutionary reversal back to the production of palmitic acid-derived pheromone components has occurred within the geometrid subfamily Sterrhinae.
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    Multiple Functions for Secondary Metabolites in Encrusting Marine Invertebrates (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 1527-1547 
    Details
    ISSN: 1573-1561
    Keywords: Secondary metabolites ; chemical defense ; evolution ; ascidians ; sponges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract We used three chemical fractions (spanning a wide range of polarities) from the extracts of four marine invertebrates, the spongesCrambe crambe andHemimycale columella and the ascidiansCystodytes dellechiajei andPolysyncraton lacazei, to test inhibition of cell division, photosynthesis, and settlement. We used assay organisms from the same habitat, seeking to determine whether a species may display diverse, ecologically relevant bioac-tivities and, if so, whether the same types of compound may be responsible for such activities. Cell division was strongly inhibited by the spongeC. crambe. A dichloromethane fraction fromC. crambe prevented development of sea urchinParacentrotus lividus eggs at a concentration of 10 μg/ml, as did the butanolic fraction, but at higher concentrations (50 and 100 μg/ml). At 50 μg/ml, the aqueous fraction ofC. crambe allowed cell division but prevented eggs from developing beyond the gastrula stage. Similar results were recorded with the dichloromethane fraction ofP. lacazei and from the aqueous fraction ofH. columella. Photosynthesis was unaffected by any of the species at 50 μg/ml. Larval settlement was inhibited by one or another fraction from the four species surveyed at a concentration of 50 μg/ml, althoughC. crambe exhibited the greatest amount of activity. We therefore found that various fractions displayed the same type of bioactivity, while compounds from the same fraction were responsible for multiple activities, suggesting that secondary metabolites are multiple-purpose tools in nature, which is relevant to our understanding of species ecology and evolution. Moreover, results showed that the assessment of the role of chemical compounds is significantly influenced by the assay organism, fractionation procedure, concentration, and duration of experiments. All these factors should be carefully considered when testing ecological hypotheses of the roles of chemically-mediated bioactivities.
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    URL: http://dx.doi.org/10.1023/B:JOEC.0000006420.04002.2e
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    From Chemical to Population Ecology: Infochemical Use in an Evolutionary Context (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 31-49 
    Details
    ISSN: 1573-1561
    Keywords: Chemical ecology ; evolution ; variation ; population dynamics ; community ; species interactions ; infochemical ; semiochemical ; parasitoid ; foraging behavior ; learning ; phenotypic plasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The marriage of chemistry with ecology has been a productive one, providing a wealth of examples of how chemicals play important roles in the loves and lives of living organisms. At first the marriage may have been a simple and monogamous one with the major scientific aim of making proximate analyses of chemically mediated, individual level interactions. But times have changed and chemical ecology is broadening, embracing different approaches and disciplines. There is, for example, increasing appreciation of variability in the systems under study and an increase in evolutionary thinking. Another promising development is greater recognition of the potential importance of chemically mediated interactions for population dynamics and for structuring communities and species coexistence. The latter is an utterly underexplored area in chemical ecology. The field of chemical ecology of insect parasitoids shows some of these promising developments. Responses of parasitoids to infochemicals are increasingly studied with an integrated approach of mechanism and function. This integration of “how” and “why” questions significantly enhances the evolutionary and ecological understanding of stimulus–response patterns. The future challenge in chemical ecology is to demonstrate how chemically mediated interactions steer ecological and evolutionary processes at all levels of ecological organization. To reach this goal there is a need for interdisciplinary collaboration among chemists and ecologists working at different levels of organization and with different approaches, with other disciplines as partners.
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    The effects of crowding on courtship and mating success inDrosophila melanogaster (1987)
    Springer
    Behavior genetics 17 (1987), S. 513-522 
    Details
    ISSN: 1573-3297
    Keywords: Drosophila melanogaster ; courtship ; crowding ; prestimulation ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract The mating times of single males and pairs of males were increased by crowding with virgin females but only at very high densities. Mating times were decreased by the presence of a second male. Quantitative analysis of courtship showed that prestimulation of females in crowded conditions influences mating. The pattern of male courtship was highly consistent across moderate levels of crowding. This suggests thatDrosophila courtships evolved in crowded conditions.
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    URL: http://dx.doi.org/10.1007/BF01073118
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    Kin recognition in birds (1988)
    Springer
    Behavior genetics 18 (1988), S. 465-482 
    Details
    ISSN: 1573-3297
    Keywords: kin recognition ; animal communication ; signature systems ; birds ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract I develop the argument that for a true kin recognition system to evolve, selection must act on both parties: not only must recognition be favored in the donor of care, but reliable identification must be favored in the potential recipient of the care. This perspective suggests two complementary hypotheses, which I discuss and evaluate with data drawn from studies of birds. According to thesignature adaptation hypothesis, when the sender benefits by reliably identifying itself, selection will act directly on phenotypic characters so as to enhance their signature properties. I summarize our studies on parent-offspring recognition in four species of swallows which are consistent with this hypothesis. In particular, acoustical and perceptual analyses of chick calls show that the calls of colonial swallows are more individually distinctive than are the chick calls of noncolonial swallows. According to theantirecognition hypothesis, when the sender doesnot benefit by reliably identifying itself, selection will act so as to minimize signature characteristics. I suggest two contexts for research on this hypothesis. The first context occurs when parentage is uncertain due to extrapair copulations and/or egg-dumping, and the second context occurs when there is a long period between the onset of chick mobility and chick fledging, as occurs typically in gulls. In both instances, parents will be favored to recognize genetic relatedness of offspring but offspring will be favored to conceal it. To date, data from bird studies are consistent with the prediction that the interests of chicks win out in this situation.
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    URL: http://dx.doi.org/10.1007/BF01065515
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    Genetics of escape-avoidance conditioning in laboratory and wild populations of rats: A biometrical approach (1981)
    Springer
    Behavior genetics 11 (1981), S. 533-544 
    Details
    ISSN: 1573-3297
    Keywords: biometrical genetics ; genetic architecture ; evolution ; rat ; wild population ; escape-avoidance conditioning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract The interest of biometrical geneticists in the genetic architecture of behavior is explained with reference to the additive, dominance, and epistatic components of variation and their relation to evolutionary pressures. For one phenotype, escape-avoidance conditioning inRattus norvegicus, a fairly complete description of its genetic architecture has been gradually built and the major conclusions from four studies of this phenotype are reported: a selection study initially demonstrated the presence of large amounts of additive genetic variation and produced phenotypically extreme lines needed for later work; a diallel cross provided the opportunity for detailed examination of the dominance effects; a triple test cross permitted a similar examination of epistatic effects; and finally, another triple test cross using wild rats provided a confirmatory first attempt to test the assumption that a wild population's genetic architecture did not differ markedly from that found in laboratory populations. In relating the genetic findings to the evolutionary significance of behaviors in the escape-avoidance paradigm, it is argued that interspecific comparisons might play a major role.
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    URL: http://dx.doi.org/10.1007/BF01070008
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    The accumulation of geophysical data in digitized format may give glimpses into the evolution of the Earth (2000)
    Springer
    The environmentalist 20 (2000), S. 257-271 
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    ISSN: 1573-2991
    Keywords: evolution ; tides ; sea level ; time series
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The increasing use of computers since the 1960s, has implied the digitization of observations in meteorology, oceanography and other observational sciences. Enough data has been accumulated to suggest that some patterns of evolution in the world may be discernable. The present article deals with what appears as changing tides around Canada.
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    URL: http://dx.doi.org/10.1023/A:1006712100068
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    Biodiversity and biotechnology (1988)
    Springer
    Journal of agricultural and environmental ethics 1 (1988), S. 175-192 
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    ISSN: 1573-322X
    Keywords: Biodiversity ; biotechnology ; ecology ; ecosystem ; environment ; ethics ; evolution ; genetics ; health ; medicine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Philosophy
    Notes: Abstract The maintenance of biodiversity is urged from many quarters and on grounds ranging from aesthetic considerations to its usefulness, particularly for biotechnology. But regardless of the grounds for preserving biodiversity, writers are generally in agreement that it should be preserved. But, in examining the various references “biodiversity,” such as species diversity, genetic diversity, and habitat diversity, it is apparent that we cannot aim to preserve biodiversityas such, since there are a number of conflicts in any such undertaking. In preserving one aspect of biodiversity, we damage another aspect. Five arguments which attempt to ground our moral concern for biodiversity are reviewed and critiqued, not only for their consistency but also for their power to move us to action. The final section of the paper shows how conflicts in the values of personal and environmental health can impair ethical action and especially policy formation.
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    URL: http://dx.doi.org/10.1007/BF01833408
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    Interspecies relationships among ADP-ribosylation factors (ARFs): Evidence of evolutionary pressure to maintain individual identities (1996)
    Springer
    Molecular and cellular biochemistry 159 (1996), S. 15-23 
    Details
    ISSN: 1573-4919
    Keywords: guanine nucleotide-binding proteins ; evolution ; phylogeny ; structure-function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract ADP-ribosylation factors (ARFs) are ∼20-kDa guanine nucleotide-binding proteins that are allosteric activators of the NAD:arginine ADP-ribosyltransferase activity of cholera toxin and appear to play a role in intracellular vesicular trafficking. Although the physiological roles of these proteins have not been defined, it has been presumed that each has a specific intracellular function. To obtain genetic evidence that each ARF is under evolutionary pressure to maintain its structure, and presumably function, rat ARF cDNA clones were isolated and their nucleotide and deduced amino acid sequences were compared to those of other mammalian ARFs. Deduced amino acid sequences for rat ARFs 1, 2, 3, 5 and 6 were identical to those of the known cognate human and bovine ARFs; rat ARF4 was 96% identical to human ARF4. Nucleotide sequences of both the untranslated as well as the coding regions were highly conserved. These results indicate that the ARF proteins are, as a family, extraordinarily well conserved across mammalian species. The unusually high degree of conservation of the untranslated regions is consistent with these regions having important regulatory roles and that individual ARFs contain structurally unique elements required for specific functions.
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    URL: http://dx.doi.org/10.1007/BF00226058
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    Comparative immunochemical studies of primate hemoglobins (1975)
    Springer
    Biochemical genetics 13 (1975), S. 743-757 
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    ISSN: 1573-4927
    Keywords: primate hemoglobins ; antigenicity ; evolution ; radioimmunoassay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The antigenic properties of a number of chromatographically purified primate hemoglobins were compared to those of normal human hemoglobin using a sensitive radioimmunochemical procedure. The degree of inhibition of the antigen-antibody reaction with heterologous hemoglobins appeared to be related to the structural similarity of these proteins to the normal human hemoglobin immunogen. With the exception of the baboon hemoglobin, the antigenicity of the hemoglobins paralleled the phylogeny of the primates. The gorilla and chimpanzee hemoglobins were antigenically identical to normal human hemoglobin, whereas the gibbon and orangutan hemoglobins were substantially more variable. Of the Old World monkey hemoglobins examined, the baboon produced lower inhibition values, suggesting a greater degree of structural dissimilarity than other Cercopithecoidea hemoglobins, which is compatible with a greater rate of evolutionary change occurring in this protein. Using the known amino acid sequences of human and other primate hemoglobins, we have attempted to identify antigenic determinant areas of the proteins.
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    URL: http://dx.doi.org/10.1007/BF00484406
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    Polymorphism and inheritance of gliadin components controlled by chromosome 6A of spring durum wheat (1988)
    Springer
    Biochemical genetics 26 (1988), S. 693-703 
    Details
    ISSN: 1573-4927
    Keywords: wheat ; gliadins ; gel electrophoresis ; evolution ; genetic analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The gliadin composition of 78 spring durum wheat varieties has been studied by one-dimensional (Al-lactate,pH 3.1) and two-dimensional (first dimension, Al-lactate,pH 3.1; second dimension, sodium dodecyl sulfate-polyacrylamide gel) electrophoresis. Analysis of hybrids has shown that all components of the α zone of gliadin spectra are inherited together as blocks and are, probably, coded for by a cluster of tightly linked genes located on chromosome 6A. Fourteen variants of gliadin blocks have been identified, which can be classified into five families on the basis of component composition. All families but one have analogues among chromosome 6A-controlled blocks of bread wheat. The results indicate that some of the genome A diploid genotypes that were ancestors of durum wheats were also ancestors of bread wheats and that polyploid wheats were produced by repeated allopolyploidization events, as has been suggested earlier.
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    URL: http://dx.doi.org/10.1007/BF00553869
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    Polymorphism and inheritance of gliadin components controlled by chromosome 6A of spring durum wheat (1988)
    Springer
    Biochemical genetics 26 (1988), S. 693-703 
    Details
    ISSN: 1573-4927
    Keywords: wheat ; gliadins ; gel electrophoresis ; evolution ; genetic analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The gliadin composition of 78 spring durum wheat varieties has been studied by one-dimensional (Al-lactate,pH 3.1) and two-dimensional (first dimension, Al-lactate,pH 3.1; second dimension, sodium dodecyl sulfate-polyacrylamide gel) electrophoresis. Analysis of hybrids has shown that all components of the α zone of gliadin spectra are inherited together as blocks and are, probably, coded for by a cluster of tightly linked genes located on chromosome 6A. Fourteen variants of gliadin blocks have been identified, which can be classified into five families on the basis of component composition. All families but one have analogues among chromosome 6A-controlled blocks of bread wheat. The results indicate that some of the genome A diploid genotypes that were ancestors of durum wheats were also ancestors of bread wheats and that polyploid wheats were produced by repeated allopolyploidization events, as has been suggested earlier.
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    URL: http://dx.doi.org/10.1007/BF02395516
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    A fern spore storage protein is genetically similar to the 1.7 S seed storage protein ofBrassica napus (1988)
    Springer
    Biochemical genetics 26 (1988), S. 595-603 
    Details
    ISSN: 1573-4927
    Keywords: storage protein ; evolution ; napin ; matteuccin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The ostrich fern,Matteuccia struthiopteris L., contains two globulin spore storage proteins of 2.2 S and 11.3 S, with physical characteristics similar to those of seed storage proteins ofBrassica napus (rapeseed) andRaphanus sativus (radish). By the use of a cloned cDNA that encodes the 1.7 SB. napus storage protein (napin), gene sequences that hybridized with napin were detected in fern nuclear DNA, and a 900-nucleotide homologous mRNA was detected in developing spores.In vitro translation of this fern mRNA produced a 22-kD polypeptide comparable in size to the 21-kD precursor polypeptide identified inBrassica. No hybridizations were observed between theBrassica 12 S clone and either fern DNA or developing spore mRNA.
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    The gene coding for glutamate dehydrogenase inDrosophila melanogaster (1990)
    Springer
    Biochemical genetics 28 (1990), S. 337-346 
    Details
    ISSN: 1573-4927
    Keywords: glutamate dehydrogenase ; Drosophila melanogaster ; gene expression ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract We have isolated theDrosophila melanogaster locus coding forl-glutamate dehydrogenase (EC 1.4.1.3) by virtue of its similarity to the corresponding human gene. There is only one copy of this gene in the fruit fly genome, located on the right arm of chromosome 3 (95D1-4). The transcript includes at least one large intron and matures to a ∼2.4-kb-long polyadenylated RNA whose expression is under developmental control.
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    URL: http://dx.doi.org/10.1007/BF02401423
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    Behavioral measures of drift inMus musculus (1985)
    Springer
    Behavior genetics 15 (1985), S. 483-497 
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    ISSN: 1573-3297
    Keywords: mice ; behavior ; domestication ; drift ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Three populations of randomly bredMus musculus, differing in size and generations of isolation, were scored on a battery of 16 behavioral and 4 physical measures. The pattern of population differences in wheel activity, open-field behavior, skin conductance, and shuttle-box behavior is consistent with the operation of drift associated more closely with small population size than with generations of separation. Other possible explanations are less likely.
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    URL: http://dx.doi.org/10.1007/BF01066241
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    Genetic influences on behavior of infantMus domesticus: A comparison of results from diallels derived from single and multiple populations (1989)
    Springer
    Behavior genetics 19 (1989), S. 551-574 
    Details
    ISSN: 1573-3297
    Keywords: Mus domesticus ; housemice ; infant behavior ; diallel analysis ; genetic variance ; heritability ; genetic dominance ; fitness ; domestication ; heterosis ; heterozygote advantage ; selection ; evolution ; ecological niche
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract A complete diallel cross was generated from six Jax inbred strains ofMus domesticus from diverse origins and a second 6×6 diallel generated from strains derived from a single wild population. During their second day of life, infants from both diallels were tested for latency to orient toward and root beneath mothers and, in a separate test, for latency to attach to mother's nipple. Rooting latency showed a significant additive maternal strain effect but little systematic effect of pup genotype. Nipple attachment latencies exhibited complete genetic dominance favoring rapid attachment, with no maternal effects. Patterns of genetic and environmental influences obtained from the two diallels were highly similar for both behaviors, suggesting that for many traits the requirement that strains be drawn from a common base population may be relaxed.
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    URL: http://dx.doi.org/10.1007/BF01066254
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    Personality and reproductive fitness (1990)
    Springer
    Behavior genetics 20 (1990), S. 563-568 
    Details
    ISSN: 1573-3297
    Keywords: personality ; fertility ; family size ; fitness ; extraversion ; neuroticism ; impulsivity ; genetic architecture ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract The relationship between reproductive success (number of biological children) and personality was explored in 1101 postmenopausal females from the Australian twin registry. The quadratic response surface relating fitness to extraversion (E) and neuroticism (N) showed a saddle point at intermediate levels of E and N. Selection was shown to be stabilizing, i.e.,having an intermediate optimum, along the axis low E, low N-high E, high N and more mildly disruptive, having greater fitness in the extremes, along the axis low N, high E-high N, low E. Neither dimension of personality considered by itself showed a significant linear or quadratic relationship to reproductive success. Sections through the fitness surface, however, show selection tends to favor high neuroticism levels in introverts and low neuroticism levels in extroverts.
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    Primary structure of hemoglobin α-chain ofColumba livia (gray wild pigeon) (1989)
    Springer
    The protein journal 8 (1989), S. 629-646 
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    ISSN: 1573-4943
    Keywords: Primary structure ; α-chain ; hemoglobin ; Columbiformes ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Primary structure of hemoglobin of α-chain ofColumba livia is presented. The separation of α-chain was obtained from globin by ion-exchange chromatography (CMC-52) and reversed-phase HPLC (RP-2 column). Amino acid sequence of intact as well as tryptic digested chain was determined on gas-phase sequencer. Structure is aligned homologously with 21 other species. Among different exchanges, positions α24 (Tyr→Leu), α26 (Ala→Gly), α32 (Met→Leu), α64 (Asp→Glu), α113 (Leu→Phe), and α129 (Leu→Val) are unique to pigeon hemoglobin. The various exchanges in α-chain are discussed with reference to evolution and phylogeny. The results show that the order Columbiformes is evolutionarily closer to the order Anseriformes. Since the pigeon is homogeneous, having HbA (αA-chain) and lacks αD-chain, its phylogenetic placement could be established among birds having single hemoglobin components.
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    Primary structure of hemoglobin from gray partridge (Francolinus pondacerianus, Galliformes) (1989)
    Springer
    The protein journal 8 (1989), S. 647-652 
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    ISSN: 1573-4943
    Keywords: hemoglobin ; primary structure ; gray partridge ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The complete amino acid sequence of the αA-chain of major hemoglobin component from gray partridgeFrancolinus pondacerianus is presented. The major component HbA accounts for 75% of the total hemolysate. Separation of the globin subunits was achieved by ion-exchange chromatography on CM-Cellulose in 8 M urea. The sequence was studied by automatic Edman degradation of the native chain and its tryptic peptides in a gas-phase sequencer. The phylogenetic relationship of Galliformes with other avian orders is discussed.
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    The Amino Acid Sequence of Ribitol Dehydrogenase-F, a Mutant Enzyme with Improved Xylitol Dehydrogenase Activity (1999)
    Springer
    The protein journal 18 (1999), S. 489-495 
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    ISSN: 1573-4943
    Keywords: Klebsiella aerogenes ; ribitol dehydrogenase ; evolution ; mutant structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A mutant ribitol dehydrogenase (RDH-F) was purified from Klebsiella aerogenes strain F which evolved from the wild-type strain A under selective pressure to improve growth on xylitol, a poor substrate used as sole carbon source. The ratio of activities on xylitol (500 mM) and ribitol (50 mM) was 0.154 for RDH-F compared to 0.033 for the wild-type (RDH-A) enzyme. The complete amino acid sequence of RDH-F showed the mutations. Q60 for E60 and V215 for L215 in the single polypeptide chain of 249 amino acid residues. Structural modeling based on homologies with two other microbial dehydrogenases suggests that E60 → Q60 is a neutral mutation, since it lies in a region far from the catalytic site and should not cause structural perturbations. In contrast, L215 → V215 lies in variable region II and would shift a loop that interacts with the NADH cofactor. Another improved ribitol dehydrogenase, RDH-D, contains an A196 → P196 mutation that would disrupt a surface α-helix in region II. Hence conformational changes in this region appear to be responsible for the improved xylitol specificity.
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    Nucleotide sequence ofatpB,rbcL,trnR,dedB andpsaI chloroplast genes from a fernAngiopteris lygodiifolia: a possible emergence of Spermatophyta lineage before the separation of Bryophyta and Pteridophyta (1992)
    Springer
    Plant molecular biology 18 (1992), S. 79-82 
    Details
    ISSN: 1573-5028
    Keywords: Angiopteris lygodiifolia ; atpB ; chloroplast genome ; evolution ; rbcL ; trnR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To elucidate the evolutionary relationship between the Spermatophyta, Pteridophyta and Bryophyta, we cloned a fragment of chloroplast DNA from the fernAngiopteris lygodiifolia (Pteridophyta) and determined its nucleotide sequence. The fragment contained theatpB,rbcL,trnR-CCG,dedB andpsaI genes. Comparisons of the deduced amino acid and nucleotide sequences of these genes from the three plant groups indicate thatAngiopteris sequences are more closely related to those of Bryophyta species (85% identity on average) than to those of seed plants (76% identity on average), supporting a hypothesis that the Bryophyta and Pteridophyta diverged more recently from one another than their common progenitor diverged from that of the Spermatophyta.
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    The activation process of Arabidopsis thaliana A1 gene encoding the translation elongation factor EF-1α is conserved among angiosperms (1992)
    Springer
    Plant molecular biology 18 (1992), S. 1083-1089 
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    ISSN: 1573-5028
    Keywords: translation elongation factor genes ; promoter analysis ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Arabidopsis thaliana, the activation process of the A1 EF-1α gene depends on several elements. Using the GUS reporter gene, transient expression experiments have shown that mutations of upstream cis-acting elements of the A1 promoter, or the deletion of an intron located within the 5′ non-coding region, similarly affect expression in dicot or monocot protoplasts. The results reported here strongly suggest that this 5′ intron is properly spliced in Zea mays. We show that two trans-acting factors, specifically interacting with an upstream activating sequence (the TEF 1 box), are present in nuclear extracts prepared from A. thaliana, Brassica rapa, Nicotiana tabacum and Z. mays. In addition, a DNA sequence homologous to the TEF 1 box, found at approximately the same location within a Lycopersicon esculentum EF-1α promoter, interacts with the same trans-acting factors. Homologies found between the A. thaliana and L. esculentum TEF 1 box sequences have allowed us to define mutations of this upstream element which affect the interaction with the corresponding trans-acting factors. These results support the notion that the activation processes of A. thaliana EF-1α genes have been conserved among angiosperms and provide interesting data on the functional structure of the TEF 1 box.
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    A rice (Oryza sativa L.) cDNA encodes a protein sequence homologous to the eukaryotic ribosomal 5S RNA-binding protein (1993)
    Springer
    Plant molecular biology 23 (1993), S. 409-413 
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    ISSN: 1573-5028
    Keywords: cDNA ; cloning ; rice ; L5 ; ribosomal 5 S RNA-binding protein ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A rice (Oryza sativa L.) cDNA clone coding for the cytoplasmic ribosomal protein L5, which associates with 5 S rRNA for ribosome assembly, was cloned and its nucleotide sequence was determined. The primary structure of rice L5, deduced from the nucleotide sequence, contains 294 amino acids and has intriguing features some of which are also conserved in other eucaryotic homologues. These include: four clusters of basic amino acids, one of which may serve as a nucleolar localization signal; three repeated amino acid sequences; the conservation of glycine residues. This protein was identified as the nuclear-encoded cytoplasmic ribosomal protein L5 of rice by sequence similarity to other eucaryotic ribosomal 5 S RNA-binding proteins of rat, chicken, Xenopus laevis, and Saccharomyces cerevisiae. Rice L5 shares 51 to 62% amino acid sequence identity with the homologues. A group of ribosomal proteins from archaebacteria including Methanococcus vanniellii L18 and Halobacterium cutirubrum L13, which are known to be associated with 5 S rRNA, also related to rice L5 and the other eucaryotic counterparts, suggesting an evolutionary relationship in these ribosomal 5 S RNA-binding proteins.
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    URL: http://dx.doi.org/10.1007/BF00029016
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    A 16 kb small single-copy region separates the plastid DNA inverted repeat of the unicellular red alga Cyanidium caldarium: physical mapping of the IR-flanking regions and nucleotide sequences of the psbD-psbC, rps16, 5S rRNA and rpl21 genes (1992)
    Springer
    Plant molecular biology 19 (1992), S. 1001-1010 
    Details
    ISSN: 1573-5028
    Keywords: Cyanidium caldarium Geitler ; evolution ; Galdieria sulphuraria ; inverted repeat ; plastid DNA ; psbD-psbC operon ; red algae ; 5S rRNA ; rpl21 ; rps16
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The four inverted repeat (IR) flanking regions of the Cyanidium caldarium plastid DNA were cloned. Southern blotting, transcript and sequence analyses of the border regions revealed the psbD-psbC operon and the rps16 gene within the large single-copy region upstream of the 16S rDNA gene and the rpl21 gene downstream of the 5S rDNA within the 16 kb small single-copy region. The size of the IR is ca. 5 kb. The nucleotide sequences of the psbD-psbC, rps16, rpl21 and 5S rRNA genes with the corresponding alignments and physical maps of the regions are presented. Northern analysis revealed a less complex psbD-psbC transcription pattern than has been found in higher plants. Comparisons to other red algal data point to structural diversity within red algal plastid DNA.
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    URL: http://dx.doi.org/10.1007/BF00040531
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    Comparison of regions coding for tRNAHis genes of mitochondrial and chloroplast DNA in sunflower: a proposal concerning the classification of ‘CP-like’ tRNA genes (1992)
    Springer
    Plant molecular biology 20 (1992), S. 1-4 
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    ISSN: 1573-5028
    Keywords: higher plants ; sunflower ; chloroplast genome ; mitochondrial genome ; tRNAHis genes ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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    URL: http://dx.doi.org/10.1007/BF00029143
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