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  • 1
    Electronic Resource
    Electronic Resource
    Building an Integrative Model of Extra Role Work Behaviors: A Comparison of Counterproductive Work Behavior with Organizational Citizenship Behavior (2002)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    International journal of selection and assessment 10 (2002), S. 0 
    Details
    ISSN: 1468-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Researchers have recently drawn attention to performance elements that extend beyond task performance (often labeled as organizational citizenship behavior, or OCB). A second stream of research concerns detrimental, potentially destructive acts that hurt colleagues or organizations (labeled counterproductive work behavior, or CWB). Spector and Fox (in press) have proposed a model based upon conceptual parallels that may help connect these two disparate fields of research, using positive and negative emotions as intermediary variables between environmental conditions and extra-role work behaviors. The current study tested portions of the overall model, and found reasonable support for the components. Suggestions for further research designed to test the overall model are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1468-2389.00193
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  • 2
    Electronic Resource
    Electronic Resource
    Morphological correlates of locomotor performance in hatchling Amblyrhynchus cristatus (1995)
    Springer
    Oecologia 103 (1995), S. 261-264 
    Details
    ISSN: 1432-1939
    Keywords: Maximum velocity ; Body size ; Hind limb components ; Relative limb lengths ; Amblyrhynchus cristatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Previous studies of locomotor performance from a variety of perspectives often assumed that speed and limb length were strongly correlated. Despite support of this assumption from biomechanical models, few empirical studies have demonstrated a significant relationship between measures of locomotor capacity, such as maximum velocity, and length of the hindlimb at either the inter- or intra-specific level. We examined whether one measure of locomotor performance, maximum velocity, correlates with body size and elements of the hindlimb in hatchling marine iguanas (Amblyrhynchus cristatus). Larger hatchlings ran faster. Removing the effects of body size revealed that relative lengths of the tibia and hindfoot correlated with size-adjusted maximum velocity. Individuals with relatively long tibia and short pes were relatively faster than individuals with short tibia and long pes. Functional morphological analyses predict that femur length should correlate with maximum velocity. However, our analyses failed to support this prediction. Because hatchling marine iguanas exploit relatively open habitats, the relationship between maximum velocity and limb morphology may be interpreted as an adaptation enhancing escape from predators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329089
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  • 3
    Electronic Resource
    Electronic Resource
    Nuclear mutations affecting plastoquinone accumulation in maize (1992)
    Springer
    Photosynthesis research 31 (1992), S. 99-111 
    Details
    ISSN: 1573-5079
    Keywords: Photosystem II ; plastoquinone ; QA ; QB ; transposable element
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have isolated and characterized two nuclear mutations which affect plastoquinone accumulation in maize. The mutations, hcf103 and hcf114, modify the same genetic locus. Plants homozygous for either mutant allele exhibit reduced PS II electron transport activity, reduced variable chlorophyll fluorescence and reduced delayed fluorescence yield. In these ways, hcf103 and hcf114 resemble previously described PS II mutants which lack stably assembled PS II reaction center complexes. However, unlike most previously described PS II mutants, hcf103 and hcf114 possess stable membrane-associated PS II complexes. Plastoquinone (PQ-9), which performs a variety of redox functions essential to normal non-cyclic electron transport, is severely depleted in the mutants. The lack of PS II electron transport activity is attributed to the absence of PQ-9. This is the first report of mutants deficient in PQ which do not also suffer serious pleiotropic defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028787
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  • 4
    Electronic Resource
    Electronic Resource
    Anomalous electron transport activity in a Photosystem I-deficient maize mutant (1990)
    Springer
    Photosynthesis research 24 (1990), S. 81-88 
    Details
    ISSN: 1573-5079
    Keywords: CP1 ; electron transport ; hcf ; mutant ; Photosystem I ; transposable element
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthesis mutations were induced in maize lines bearing the transposable DNA element system, Mutator. Two Photosystem I mutants (hcf101 and hcf104) which were isolated are described here. Maize plants homozygous for the hcf104 mutation are seedling lethal and exhibit a high in vivo chlorophyll fluorescence yield. They lack ∼60% of CP1, P700 and PSI-specific electron transport activity relative to normal sibling plants. The comparable depletion of these three measures of PS I content conforms to the pattern reported for many other PS I-deficient mutants. Maize plants homozygous for hcf101 are seedling lethal and also exhibit high in vivo chlorophyll fluorescence yield. They lack 80–90% of CP1 and P700 but sustain steady state levels of PS I-specific electron transport activity at 70% of normal. Previous reports of similar apparent PS I hyperactivity are discussed and an explanation for the elevated steady state level of PS I electron transport activity in hcf101 is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032647
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  • 5
    Electronic Resource
    Electronic Resource
    Transposon mutagenesis of nuclear photosynthetic genes in Zea mays (1988)
    Springer
    Photosynthesis research 18 (1988), S. 33-59 
    Details
    ISSN: 1573-5079
    Keywords: cloning ; mutation ; photosynthesis mutant ; transposon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The discovery of a new maize (Zea mays L.) transposon system, Mutator, and the cloning of the 1.4 kilobase transposon, Mul, have made feasible the isolation of nuclear photosynthetic genes which are recognized only by their mutant phenotype. Mutant maize plants which express a high chlorophyll fluorescent (hcf) phenotype due to a defect in the electron transport or photophosphorylation apparatus have been isolated following mutagenesis with an active Mutator stock. The affected genes and their products in these mutants are inaccessible to classical methods of analysis. However, mutagenesis with the Mutator transposon makes it possible to isolate these genes. Although the PSII-deficient mutant hcf3 has been thoroughly studied by classical photo-biological methods, the nature of the lesion which results in the observed phenotype has not been established. A Mutator-induced allele of hcf3 has been isolated. A fragment of genomic DNA has been identified which is homologous to Mul and co-segregates with the mutant phenotype. This fragment is expected to contain a portion of the hcf3 locus which will be used to clone the normal gene. Direct study of the gene can provide insight into the nature and function of its polypeptide product. This approach can be used to study any photosynthetic gene which has been interrupted by a transposon. The isolation of more than 100 different chemically-induced hcf mutants, most of which can not be fully characterized using classical means, indicates the wealth of information which can be obtained using a transposon tagging technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042979
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  • 6
    Electronic Resource
    Electronic Resource
    Energy transfer for low temperature fluorescence in PS II mutant thylakoids (1995)
    Springer
    Photosynthesis research 44 (1995), S. 117-125 
    Details
    ISSN: 1573-5079
    Keywords: chlorophyll fluorescence ; chlorophyll-protein complex ; maize mutant ; photosynthesis ; thylakoid membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Chl-protein complexes of three maize (Zea mays L.) mutants and one barley (Hordeum vulgare L.) mutant were analyzed using low temperature Chl fluorescence emissions spectroscopy and LDS-polyacrylamide gel electrophoresis. The maize mutants hcf-3, hcf-19, and hcf-114 all exhibited a high Chl fluorescence (hcf) phenotype indicating a disruption of the energy transfer within the photosynthetic apparatus. The mutations in each of these maize mutants affects Photosystem II. The barley mutant analyzed was the well characterized Chl b-less mutant chlorina-f2, which did not exhibit the hcf phenotype. Chlorina-f2 was used because no complete Chl b-less mutant of maize is available. Analysis of hcf-3, hcf-19, and hcf-114 revealed that in the absence of CP43, LHC II can still transfer excitation energy to CP47. These results suggest that in mutant membranes LHC II can interact with CP47 as well as CP43. This functional interaction of LHC II with CP47 may only occur in the absence of CP43, however, it is possible that LHC II is positioned in the thylakoid membranes in a manner which allows association with both CP43 and CP47.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018302
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