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  • 1
    Electronic Resource
    Electronic Resource
    Vanadium K-edge absorption spectrum of bromoperoxidase from Ascophyllum nodosum
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Protein Structure and Molecular 956 (1988), S. 293-299 
    Details
    ISSN: 0167-4838
    Keywords: (Marine brown alga) ; Bromoperoxidase ; Coordination sphere ; K-shell ; NMR, ^5^1V- ; Vanadium protein ; XANES
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0167-4838(88)90146-X
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  • 2
    Electronic Resource
    Electronic Resource
    Larval consumption rates, interspecific predation, and local guild composition of egg-overwintering Agabus (Coleoptera, Dytiscidae) species in vernal ponds (1988)
    Springer
    Oecologia 76 (1988), S. 131-137 
    Details
    ISSN: 1432-1939
    Keywords: Dytiscidae ; Vernal ponds ; Mosquito consumption ; Quild composition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In vernal ponds in the boreal region, egg-over-wintering Agabus species form a guild that feeds mainly on larvae and pupae of aedine mosquitoes. The regular co-existence of very similar Agabus species indicates local communities not structured by interspecific competition. However, the lower number of species in local guilds than in the regional species pool poses a problem of limited membership. We suggest that the species of this guild display habitat differences mainly with respect to water temperature, pond size and prey density. In this view, habitat selection reflects body size and thermal growth response of the species, mainly in connection with larval development. We present field data from two northern Swedish vernal ponds. Based on these data, feeding experiments were performed to test the hypothesis outlined above. At a high prey density, larvae of all instars of the larger species A. erichsoni Gemm. & Har. had a significantly higher consumption rate than those of the smaller species A. opacus Aubé. At a low prey density the differences were smaller, and only the third instar larvae differed significantly. At 2° C, larvae of A. opacus had a significantly higher consumption rate than those of A. congener (Thunberg). At 15° C, no significant difference was observed. In studies of within-guild interspecific predation, always the larger larvae consumed the smaller ones. Field data show that egg hatching is spread out in time, and show interspecific differences. Consequently, the effects of unexpected droughts differ with species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379611
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  • 3
    Electronic Resource
    Electronic Resource
    Dytiscus latissimus and D. circumcinctus (Coleoptera, Dytiscidae) larvae as predators on three case-making caddis larvae (1992)
    Springer
    Hydrobiologia 248 (1992), S. 201-213 
    Details
    ISSN: 1573-5117
    Keywords: predation ; preferences ; behaviour ; dytiscid larvae ; trichopteran larvae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The predacious behaviour of Dytiscus circumcinctus and D. latissimus larvae was studied experimentally. When offered different prey simultaneously, D. latissimus larvae preferred cased caddis larvae relative to mayfly nymphs and isopods, whereas in D. circumcinctus the preference order was reversed. Notonectid nymphs and tadpoles were consumed in higher numbers by D. circumcinctus than by D. latissimus larvae. D. circumcinctus larvae and instar III larvae of D. latissimus most frequently captured caddis larvae through the case wall, whereas the instar I and II larvae of D. latissimus normally attacked the thorax of the exposed larva from above the front opening of the case. Limnephilus borealis, L. nigriceps and L. rhombicus caddis larvae differed in case structure, and they were all successfully captured by D. latissimus and D. circumcinctus instar II and III larvae. Neither capture success nor ingestion efficiency varied significantly between the two Dytiscus species or between different prey species. Instar II and III D. circumcinctus larvae had shorter reaction times than those of D. latissimus. The larger L. borealis and L. rhombicus larvae were preferred by the two last Dytiscus larval instars, and the handling time of these two prey was longer than that of L. nigriceps larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006148
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  • 4
    Electronic Resource
    Electronic Resource
    Distribution patterns of freshwater Ostracoda (Crustacea) in the Canary Islands with regards to habitat use and biogeography (1997)
    Springer
    Hydrobiologia 347 (1997), S. 159-170 
    Details
    ISSN: 1573-5117
    Keywords: Island biogeography ; Ostracoda ; CanaryIslands ; habitat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In this study biogeographic patterns and habitatrelationships of freshwater Ostracoda wereinvestigated in the Canary Island archipelago. Mostdata were collected from published studies, thoughalso new data from Gran Canaria are presented. In all,22 freshwater species are presently known to theCanaries. Six species, viz. Ilyocypris bradyi,Cypris bispinosa, C. pubera, Herpetocypris chevreuxi, Heterocyprisincongruens, and Sarscypridopsis lanzarotensisare new to Gran Canaria, the first two also being newto the Canaries in general. Testing the influence ofa number of variables on faunal richness indicatedonly a weak association with island area. Distancesbetween islands also proved not significant, and sodid other properties of islands, including age,altitude and precipitation. This was in contrast to acomparison set of data comprising aquatic beetles.Like beetles, however, ostracods did not show a nestedpattern, i.e. faunas of species-poor islands were notsubsets of species-rich island faunas. By having lowendemicity (endemic species lacking in the Canaries),the ostracod fauna resembled island fern floras. Bothgroups of organisms have tiny diaspores (diameter〈0.1 mm) and are extensively parthenogeneticsuggesting similar dispersal and founder mechanisms.We identified a pattern (with one exception), wherethose species with distributions extending acrossseveral islands also had wider within-islanddistributions. Many species showed affinities todifferent habitats depending on conductivity of water,altitude and habitat types: whether they werepermanent or temporary, hypogean or epigean, orcharacterized by running or stagnant waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003087806637
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  • 5
    Electronic Resource
    Electronic Resource
    Assemblages of dytiscid predators and culicid prey in relation to environmental factors in natural and clear-cut boreal swamp forest pools (1995)
    Springer
    Hydrobiologia 308 (1995), S. 183-196 
    Details
    ISSN: 1573-5117
    Keywords: species richness ; relative abundance ; Dytiscidae ; Culicidae ; temporary pools ; abiotic effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Assemblages of diving beetles (Dytiscidae) and mosquito immatures (Culicidae) were studied during 1987–1988 in 40 small, more or less temporary, snowmelt pools in spruce swamp forest and clearings at the Arctic Circle in Sweden. Larger pools were warmer than smaller ones, and clearing pools were warmer than forest pools. Temperature differences between pools remained high until late July. Twenty-one dytiscid species, representing three guilds, occurred in the pools, and individual pools had 1–13 species. Ten species occurred in both habitats. A few stenotopic species of boreal swamp forests had in clearing pools apparently been replaced by some species with a preference for more productive, often man-made habitats. Six Aedes species were collected in the clearing pools. Five of these were found in the forest pools, of which three had no mosquito larvae. Dytiscid assemblages in both habitats and culicid assemblages in clearing pools showed strong nested patterns. Abundance and species richness of both culicids and dytiscids were higher in clearing than in forest pools with an area 〉2 m2 after that the effects of pool area had been accounted for (MANCOVA). In both habitats, abundance and species richness of both culicids and dytiscids were strongly and positively correlated with a linear combination of pool area, depth and temperature (Canonical Correlation). Increasing drought frequency of pools had a negative, less significant effect on the biota. In the clearing, the abiotic correlations with abundance were somewhat weakened chiefly by the relatively low abundance values from the largest pool. Distribution and mean abundance of individual dytiscid species were positively related in the clearing pools. Flying dytiscids were trapped in the larger (1.6 m2), but not in the smaller (0.07 m2) artificial pools, and the immigration rate was markedly higher on clearings than in forest. Dug pools were colonized faster on clearings than in forest. Even the flightless Hydroporus melanarius colonized dug pools during the first year.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006870
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  • 6
    Electronic Resource
    Electronic Resource
    Abundance and species richness patterns of diving beetles (Coleoptera, Dytiscidae) from exposed and protected sites in 98 northern Swedish lakes (1996)
    Springer
    Hydrobiologia 321 (1996), S. 83-88 
    Details
    ISSN: 1573-5117
    Keywords: species richness ; abundance ; boreal lakes ; Dystiscidae ; sampling methods ; body length ; substrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Forty species of predaceous diving beetles (Coleoptera, Dytiscidae) were collected in sweepnet samples from 98 boreal lakes in northern Sweden. Samples from protected sites with vegetation had significantly more specimens and species than those from exposed sites without vegetation in the same lakes. No geographically based differences, e.g. latitudinal or in distance from the coast, were found. These gradients were 200 and 150 km long, respectively. Species' distribution in terms of occurence at number of sites was positively correlated with the mean abundance of the species. The relationship between species' abundance and body length was characterized by the lack of large, abundant species. Partial least square regressions on dytiscid abundance and species richness showed low predictive power of lake area, altitude and water chemistry. The seven environmental variables used explained at best 15.3 and 24.4% of the total variance in abundance and species richness, respectively. The results are compared to activity trap catches of dystiscids in lakes in an adjacent region. A majority of the species occured in both materials. However, species occuring in high proportion in one of the materials, were rare in the other material. The mean body length of the species caught more efficiently with traps was not larger than that of those overpresented in net sampling. Based on this study and the available literature data, the regional species pool of boreal lake dytiscids is estimated to 30–40 species. It is still an open question if lake assemblages are markedly poorer than those found in the development of vegetation, whereas the impact of water chemistry is small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018680
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  • 7
    Electronic Resource
    Electronic Resource
    Insects of a small aestival stream in northern Sweden (1994)
    Springer
    Hydrobiologia 294 (1994), S. 17-22 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The insects of a small and cold aestival stream in northern Sweden were studied from semiquantitative kick-samples taken every ten days throughout the ice-free season in 1987. The stream froze solid at least in some sections in some winters. In addition to dipterans that were only identified to the family level, five ephemeropteran, four plecopteran, 11 coleopteran (Dytiscidae), and four trichopteran (Limnephilidae) species were found. Baetis bundyae Lemkuhl, Heptagenia orbiticola Kluge (Ephemeroptera), Nemoura cinerea (Retzius) (Plecoptera), Hydroporus palustris (L), Agabus setulosus (J. Sahlberg) (Coleoptera), Anabolia concentrica (Zetterstedt), Limnephilus coenosus Curtis, and Micopterna sequax McLachlan (Trichoptera) were all common. Malaise trap data are given for Plecoptera. The two ephemeropteran species Heptagenia orbiticola and Metretopus alter Bengtsson, and the plecopteran species Nemoura viki Lillehammer were recorded for the first time in Sweden. The remarkable species composition was attributed to the harsh abiotic and poorly studied environment. We predicted that the larval composition of this stream was representative for aestival streams in northernmost Fennoscandia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017621
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  • 8
    Electronic Resource
    Electronic Resource
    Improving the properties of hard alloy products by machining (1967)
    Springer
    Powder metallurgy and metal ceramics 6 (1967), S. 1011-1013 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The bending strength in plates made by using machining is 25% higher than that of plates pressed into a complete section. 2. An important role in reducing the static bending strength of a concentrated load in products in relation to the method of formation is played by the zone adjacent to the bevel. 3. Making the articles by machining enables us to obtain a better surface finish on the cutting face.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00779970
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  • 9
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    Glycosyl transferases in family 61 mediate arabinofuranosyl transfer onto xylan in grasses (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-01-03
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Large ARF guanine nucleotide exchange factors in membrane trafficking (2008)
    Springer
    Details
    Publication Date: 2008-07-07
    Print ISSN: 1420-682X
    Electronic ISSN: 1420-9071
    Topics: Biology , Medicine
    Published by Springer
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