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  • 1
    Electronic Resource
    Electronic Resource
    Pharmacological Therapy for Ventricular Arrhythmias in the Era of the Implantable Cardioverter Defibrillator: Indispensable or Inadvisable? (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 11 (1998), S. 0 
    Details
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8183.1998.tb00124.x
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  • 2
    Electronic Resource
    Electronic Resource
    Insights into the Evolution of Nuclear Dualism in the Ciliates Revealed by Phylogenetic Analysis of rRNA Sequences (1996)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 43 (1996), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The small subunit rRNA gene sequences of the karyorelictean ciliates, Loxodes striatus and Protocruzia sp., and the heterotrichian ciliates, Climacostomum virens and Eufolliculina uhligi, were used to test the evolution of nuclear dualism in the Phylum Ciliophora. Phylogenies derived using a least squares distance method, neighbour joining, and maximum parsimony demonstrate that the karyorelictean ciliates sensu Small and Lynn, 1985 do not form a monophyletic group. However, Loxodes and the heterotrich ciliates form the first branch in the ciliate lineage, and Protocruzia branches, in distance methods, basal to the spirotrich lineage. It is proposed that Protocruzia be removed from the Class Karyorelictea, and placed in closer taxonomic association with the spirotrich lineage. The distribution of nuclear division types along the phylogenetic tree is consistent with the notion that macronuclei incapable of division represent a derived rather than a primitive or “karyorelictid” character trait.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1996.tb01396.x
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  • 3
    Electronic Resource
    Electronic Resource
    Phylogeny of Trichomonads Inferred from Small-Subunit rRNA Sequences (1995)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 42 (1995), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . Small subunit (16S-like) ribosomal RNA sequences were obtained from representatives of all four families constituting the order Trichomonadida. Comparative sequence analysis revealed that the Trichomonadida are a monophyletic lineage and a deep branch of the eukaryotic tree. Relative to other early divergent eukaryotic assemblages the branching pattern within the Trichomonadida is very shallow. This pattern suggests the Trichomonadida radiated recently, perhaps in conjunction with their animal hosts. From a morphological perspective the Devescovinidae and Calonymphidae are considered more derived than the Monocercomonadidae and Trichomonadidae. Molecular trees inferred by distance, parsimony and likelihood techniques consistently show the Devescovinidae and Calonymphidae are the earliest diverging lineages within the Trichomonadida, however bootstrap values do not strongly support a particular branching order. In an analysis of all known 16S-like ribosomal RNA sequences, the Trichomonadida share most recent common ancestry with unidentified protists from the hindgut of the termite Reticulitermes flavipes. The position of two putative free-living trichomonads in the tree is indicative of derivation from symbionts rather than direct descent from some free-living ancestral trichomonad.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1995.tb01604.x
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  • 4
    Electronic Resource
    Electronic Resource
    Phylogenetic Relationships of the Nassulida Within the Phylum Ciliophora Inferred from the Complete Small Subunit rRNA Gene Sequences of Furgasonia blochmanni, Obertrumia georgiana, and Pseudomicrothorax dubius (1995)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 42 (1995), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . Using comparisons of complete small subunit rRNA sequences from the ciliated protozoans Furgasonia blochmanni, Obertrumia georgiana, and Pseudomicrothorax dubius we inferred the phylogenetic position of the Nassulida (Class Nassophorea) within the Ciliophora. In distance matrix analyses the Nassulida share a common ancestry with the colpodean ciliate Colpoda inflata. Distance matrix and parsimony methods convincingly demonstrate that the Nassulida plus Colpodida are members of a complex ciliate assemblage that also includes the oligohymenophorans and phyllopharyngeans. These phylogenetic inferences are largely congruent with recent analyses of 23S-like rRNA gene sequences and morphogenetic features. Groups traditionally thought to represent ancestral lineages now appear as highly derived ciliates. In contrast, heterotrichs which were considered to represent a highly evolved group, diverge at the base of the ciliates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1995.tb01552.x
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  • 5
    Electronic Resource
    Electronic Resource
    An alternative model for neutralization of radon decay products (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 5509-5514 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The widely held view that the majority of radon decay products carry a positive charge at birth, independent of the electric field at the site of production, is challenged. Following Wellisch [Philos. Mag. Suppl. 26, 623 (1913)] we propose that the fraction born charged is in fact a strong function of the electric field, and that neutralization of the decay products must be treated in two distinct parts corresponding to recombination in the initial ionization column and neutralization in the volume of the gas. We illustrate our argument with measurements relating to the birth (by momentum recoil at a surface) of 208Tl ions, and their subsequent transport through argon and air. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367380
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  • 6
    Electronic Resource
    Electronic Resource
    COMMENSURATION AS A SOCIAL PROCESS (1998)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Sociology 24 (1998), S. 313-343 
    Details
    ISSN: 0360-0572
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Sociology
    Notes: Abstract Although it is evident in routine decision-making and a crucial vehicle of rationalization, commensuration as a general social process has been given little consideration by sociologists. This article defines commensuration as the comparison of different entities according to a common metric, notes commensuration's long history as an instrument of social thought, analyzes commensuration as a mode of power, and discusses the cognitive and political stakes inherent in calling something incommensurable. We provide a framework for future empirical study of commensuration and demonstrate how this analytic focus can inform established fields of sociological inquiry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.soc.24.1.313
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  • 7
    Electronic Resource
    Electronic Resource
    12,12-Ethylenedioxy-8α,9α-epoxypodocarpan-19-oic Acid (1998)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 1672-1673 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270198008269
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  • 8
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary X-ray diffraction studies of E. coli porphobilinogen synthase and its heavy-atom derivatives (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 438-440 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Porphobilinogen synthase (PBGS) catalyzes the condensation of two identical substrate molecules, 5-aminolevulinic acid (ALA), in an asymmetric manner to form porphobilinogen. E. coli PBGS is an homooctameric enzyme. The number of active sites is not clear, but each subunit binds one ZnII ion and one MgII ion. Diffraction-quality crystals of native E. coli PBGS have been obtained, and unit-cell dimensions (a = 130.8, c = 144.0 Å) are reported. These crystals diffract to about 3.0 Å resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444997010925
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  • 9
    Electronic Resource
    Electronic Resource
    Divergence of Endocardial QT Interval Components during Programmed Electrical Stimulation Including Observations during Induction of Sustained Ventricular Tachyarrhythmias (1997)
    Springer
    Journal of interventional cardiac electrophysiology 1 (1997), S. 23-31 
    Details
    ISSN: 1572-8595
    Keywords: programmed stimulation ; invasive clinical electrophysiologic testing ; ventricular tachyarrhythmias ; coronary heart disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Measurements were made in 12 normal subjects and during induction ofsustained ventricular tachyarrhythmias in 31 patients with remote myocardialinfarction. QT interval measurements were made semiautomatically withcomputer assistance and the total QT interval was divided into early (QT 1 )and late (QT 2 ) components. QT intervals and QT interval dispersion betweentwo right ventricular endocardial sites were plotted against the degree ofprematurity of the last extrastimulus (S 2 , S 3 , or S 4 ). In the controlgroup, total QT and QT 1 intervals shortened with increasing prematurity ofthe last extrastimulus (p , 0.001). Slopes (positive) were steeper withfaster pacing rates (600, 500, or 400 ms) and more extrastimuli (1 to 3).The relationship between QT 2 intervals and prematurity of the lastextrastimulus was flat, but the slope was slightly negative (p=0.05to,0.001) and did not vary with changes in pacing cycle length or number ofextrastimuli. QT interval dispersion in the control group was minor(95% CI 0-40 ms). During induction of sustained ventriculartachyarrhythmias, total QT and QT 1 intervals were longer (y intercepts)than in the control group (p , 0.05 at 400-ms pacing cycle length) and theirdispersion was increased (p , 0.05). Generally, QT 2 intervals were shorter(p , 0.05 at 600-ms pacing cycle length) during induction of ventriculararrhythmias in comparison with the control group but dispersion wasincreased (p , 0.05 at 400-ms pacing cycle length). QT intervals and QTinterval dispersion show an orderly and predictable relationship withprematurity of the last extrastimulus in normal subjects. These patternsdiffer during induction of sustained ventricular tachyarrhythmias. Suchdifferences may be exploited to derive clinically predictive and usefulmeasurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009706516217
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  • 10
    Electronic Resource
    Electronic Resource
    Primary Structure and Phylogenetic Relationships of a Malate Dehydrogenase Gene from Giardia lamblia (1999)
    Springer
    Journal of molecular evolution 48 (1999), S. 750-755 
    Details
    ISSN: 1432-1432
    Keywords: Key words:Giardia lamblia— Diplomonads — Malate dehydrogenase — Protein phylogeny — Amitochondriate protist
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The lactate and malate dehydrogenases comprise a complex protein superfamily with multiple enzyme homologues found in eubacteria, archaebacteria, and eukaryotes. In this study we describe the sequence and phylogenetic relationships of a malate dehydrogenase (MDH) gene from the amitochondriate diplomonad protist, Giardia lamblia. Parsimony, distance, and maximum-likelihood analyses of the MDH protein family solidly position G. lamblia MDH within a eukaryote cytosolic MDH clade, to the exclusion of chloroplast, mitochondrial, and peroxisomal homologues. Furthermore, G. lamblia MDH is specifically related to a homologue from Trichomonas vaginalis. This MDH topology, together with published phylogenetic analyses of β-tubulin, chaperonin 60, valyl-tRNA synthetase, and EF-1α, suggests a sister-group relationship between diplomonads and parabasalids. Since these amitochondriate lineages contain genes encoding proteins which are characteristic of mitochondria and α-proteobacteria, their shared ancestry suggests that mitochondrial properties were lost in the common ancestor of both groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00006519
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