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  • 1
    Electronic Resource
    Electronic Resource
    Strain-induced surface morphology of slightly mismatched InxGa1−xAs films grown on vicinal (100) InP substrates (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 7185-7190 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A surface investigation by atomic force microscope of InP and slightly lattice-mismatched InGaAs epilayers grown by metalorganic vapor phase epitaxy shows the effect of strain on InGaAs/InP surface morphology. Epilayers were grown at 600 °C with arsine at 760 Torr. We could clearly observe the regular step/terrace-like feature of the vicinal surface morphology for InP and InGaAs lattice-matched epilayers. It is shown that the step flow mode appears with a step edge with regular spacing for lattice-matched epilayers. A crosshatch pattern, i.e., an array of perpendicular lines visible at the surface, were obtained for strain-relaxed InGaAs epilayers (|(Δa/a)⊥|〉10−3) with an average separation of 1000–1500 nm. The detailed surface structure of the step edge presents a specific bending of terraces. The influence of step kinetics on the morphological stability of the surface will be illustrated. The relationship between the misfit dislocation network and anisotropic growth rate of the front step will be discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370530
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  • 2
    Electronic Resource
    Electronic Resource
    Dissolution and passivation processes in the corrosion of copper and nickel in KF.2HF at 85 °C (1997)
    Springer
    Journal of applied electrochemistry 27 (1997), S. 267-279 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The process of electrolytic production of fluorine is conducted in a melt of KF.2HF at about 85°C. The metallic cell materials, copper and copper–nickel alloys (Monel), and the steel electrodes that are used as the cathode, are subject to substantial corrosion in the liquid electrolyte. Comparative studies are reported on the relative extent of corrosion of copper and nickel in the above melt, and the respective passivation behaviours of these two metals. The formation of fluoride films on the two metals is examined by means of cyclic voltammetry and complementarily through recording of open-circuit potential-decay transients, following passivation. Flade behaviour is observed and the role of diffusion-controlled processes in depassivation is quantitatively evaluated. Weight-change measurements also support the electrochemically derived results. The passive film at Ni is much less easily reducible than at Cu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018424628739
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  • 3
    Electronic Resource
    Electronic Resource
    Passivation and depassivation of Monel electrodes in KF.2HF melts in comparison with the behaviour of nickel (1997)
    Springer
    Journal of applied electrochemistry 27 (1997), S. 1245-1253 
    Details
    ISSN: 1572-8838
    Keywords: fluorine production ; monel alloy ; corrosion ; passive films ; KF.2HF melts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Commercial fluorine production is conducted from KF.2HF melts at 85∘C in Monel cells that are subject to corrosion. Here we report studies of passivation and depassivation of the Monel in relation to that of Ni, its principal (65 wt % ) constituent, by means of cyclic voltammetry and recording of open-circuit potential-relaxation transients. The latter exhibit arrests at characteristic Flade-type potentials and lead to information on the kinetics of passive film breakdown. The role of diffusion processes in such breakdown and film dissolution is evaluated using the rotating disc electrode technique which enables comparisons to be made with the passivation behaviour of the separate main components of Monel, viz. Ni and Cu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018436004516
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  • 4
    Electronic Resource
    Electronic Resource
    Rotifera, Cladocera, Copepoda, and Ostracoda from coastal wetlands in northeast Algeria (1998)
    Springer
    Hydrobiologia 386 (1998), S. 183-193 
    Details
    ISSN: 1573-5117
    Keywords: freshwater zooplankton ; wetlands ; Algeria ; biogeography ; Afrotropical relict fauna
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two wetland complexes in the El Kala area, northeast Algeria, were sampled for zooplankton over a two-month period (mid-May to mid-July 1993). Some samples from 1976 and 1978 were also studied. A total of 98 taxa (51 species of Microcrustacea and 47 species of Rotifera) are recorded. Twenty-seven of these (26.5% overall) are new to Algeria and/or to the Maghreb and Africa. A significant fraction of Afrotropical species was found in all four groups, beside species of northern (European) origin, and at least one cyclopoid copepod with an Irano-Turanian range. These results confirm the El Kala wetlands as an important relict pocket of species of various historical and geographical origin, and highlight the urgency of safeguarding these sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003538730152
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  • 5
    Electronic Resource
    Electronic Resource
    Feeding preference and population growth of Asplanchna brightwelli (Rotifera) offered two non-evasive prey rotifers (1997)
    Springer
    Hydrobiologia 361 (1997), S. 77-88 
    Details
    ISSN: 1573-5117
    Keywords: Rotifer ; biomass ; predation ; population growth ; handlingtime
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Population growth rates of the predatory rotifer Asplanchna brightwelli were determined at 25 °C using a large (Brachionus calyciflorus) and a small (Anuraeopsis fissa) rotifer prey species in three concentrations (0.5, 0.1 and 2.0 μg dry weight ml-1) and in five combinations. The prey ingestion time by the predator was also measured. For B. calyciflorus the ingestion time (22.97–8.95 s) was more than six times that of A. fissa (3.68 ± 0.93). Regardless of prey type, the population growth of Asplanchna increased with increasing food density. There was a direct correlation between densities of amictic and mictic fernales. The maximum rate of population growth (1.01 ± 0.10 d-1) was higher at high density of A. fissa prey than that at the same density of B. calyciflorus. Progressive increase of A. fissa density in the offered food combination resulted in a corresponding increase of the predator's number. Gut content analysis of A. brightwelli revealed that the number of prey ingested increased with increasing prey densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003189312452
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  • 6
    Electronic Resource
    Electronic Resource
    Culturing the fairy shrimp Streptocephalus dichotomus Baird using livestock waste – a reclamation study (1997)
    Springer
    Hydrobiologia 358 (1997), S. 199-203 
    Details
    ISSN: 1573-5117
    Keywords: fairy shrimp ; organic waste ; reclamation ; biomass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The present study describes a defined culturetechnique for the fairy shrimp, Streptocephalusdichotomus. It emphasizes reclamation of low-cost organiclive-stock waste(cow-dung), lime powder, and urea. These compounds wereused to enrich algal and diatom populations in themedium. These algae and diatoms were fed to filter feedingfairy shrimps to yield anostracanbiomass. A production of 262 ± 6 animals l−1was obtained in an experimental tank compared to 36 ± 4animals l−1 in the controls. Interestingly,the total number of clutches in experimentalfemales (12 ± 2), relative to the control (7 ± 1),increased too.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003136507728
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  • 7
    Electronic Resource
    Electronic Resource
    ERRATUM: A note on the Diaptomidae of Thailand, including redescription of three species and description of a new species (Copepoda, Calanoida) (1998)
    Springer
    Hydrobiologia 377 (1998), S. 217-218 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hydrobiologia 361: 201–223, 1998. Due to technical problems, Figures 91–94 on page 217 of the above volume were poorly reproduced. We now present the correct figures with their captions, on page 218 of this volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003474411353
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  • 8
    Electronic Resource
    Electronic Resource
    Demography and population growth of Asplanchna girodi (Rotifera) as a function of prey (Anuraeopsis fissa) density (1995)
    Springer
    Hydrobiologia 306 (1995), S. 97-107 
    Details
    ISSN: 1573-5117
    Keywords: prey-predator interaction ; population growth ; mortality ; rotifers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory studies on population growth and life table demography of Asplanchna girodi were conducted at 25±1 °c using Anuraeopsis fissa as prey at four (250, 500, 1000 and 2000 ind ml−1) densities. A prey density of 100 ind ml−1 per predator per day did not support A. girodi, while at the highest prey concentration, A. girodi reached a peak of 115±7 ind ml−1. The age distribution of A. girodi indicated that non-adults constituted about 2/3rd of the population at all prey concentrations. A decrease in prey availability resulted in increased mortality of non-adults. At the highest prey density, the rate of population increase (r) was 1.51 d−1. The significance of estimating mortality in population growth studies is discussed. Life table demography of A. girodi was also studied using the same prey at the same concentrations. None of the survivorship parameters (e.g. mean lifespan and mean survivorship) showed a significant relation to prey density. Net reproductive rate and generation time (but not rate of population increase) were affected by prey abundance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016827
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  • 9
    Electronic Resource
    Electronic Resource
    102+ rotifer species (Rotifera: Monogononta) in Broa reservoir (SP., Brazil) on 26 August 1994, with the description of three new species (1995)
    Springer
    Hydrobiologia 316 (1995), S. 183-197 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; Broa reservoir ; new species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The monogonont Rotifera fauna of Lobo (Broa) reservoir (SP., Brazil), present in 12 samples collected on a single date during the cool season (26 August 1994), is listed and commented upon. In total, 102 species could be identified, three of which, Ascomorpha tundisii n.sp., Lecane broaensis n.sp. and Lepadella neglecta n.sp. are new to science. Lecane mitis Harring & Myers and Lepadella elongata Koste are redescribed. A note on the taxonomy of the Ascomorpha saltans-group is added.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017436
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of zooplankton type and abundance on prey consumption by the fairy shrimp, Streptocephalus proboscideus (Anostraca: Crustacea) (1996)
    Springer
    Hydrobiologia 319 (1996), S. 191-202 
    Details
    ISSN: 1573-5117
    Keywords: fairy shrimp ; zooplankton ; prey size ; prey density ; electivity index ; filtration rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory cultured Streptocephalus proboscideus (three sizes (mm), viz. 8.44 ± 0.95 (virgin), 14.18 ± 1.49 (adult I) and 19.24 ± 1.52 (adult II)) were offered (separately for males and females) field collected zooplankton (12 prey types) at three levels of abundance (1.0 ml−1, 2.0 ml−1 and 4.1 ind. ml−1 in 30-minute feeding experiments. Gut contents, analyzed for abundance and diversity of prey type, showed that predator size, sex and their interaction had strong effects on prey consumption. Regardless of their size, and of prey density, S. proboscideus females consumed 25–90% more prey than males. Their filtration rates (adult II) were higher (125 ml ind.−1 h.−1) than those of males (30 ml ind.−1 h.−1) too. Rotifers had the highest numerical percentage in the gut, regardless of predator size or sex. Cladocerans were only consumed by adults I and II. Adult II females consumed 28.5–43.3 µg zooplankton dry weight ind.−1 h.−1. Size distribution of B. longirostris in the field and in the gut were closely similar. This study confirms S. proboscideus as a non-selective filter feeder. Since it did not eat jumping rotifers, copepod nauplii and copepodites, it may contribute to structuring its prey communities, because good escapers will be enriched in the medium, while poor escapers will be depleted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00013732
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