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  • 1
    Electronic Resource
    Electronic Resource
    An Improved Magnesite Crucible (1940)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 12 (1940), S. 48-51 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac50141a018
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  • 2
    Electronic Resource
    Electronic Resource
    The age, growth and reproduction of the stone loach Noemacheilus barbatulus (L.) in a Dorset chalk stream (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 13 (1983), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 〈list xml:id="l1" style="custom"〉1In this highly productive chalk stream the stone loach, sampled by electrofishing over a 30 month period, had a high growth rate reaching a mean length of 65 mm in 1 year and 93 mm in 2 years. The fish were short-lived in contrast to most slow-growing populations in the U.K. and Finland with 11 group fish comprising 8.8% and III group fish only 1.1% of the total number.2The loach were fractional spawners: a 75 mm female produced an estimated 10,620 eggs between late April and early August totalling 46% of the loach's initial weight.3In March and April some small 0 group females contained only poorly developed eggs and up to 10% of 0 group fish may have failed to spawn.4Amongst loach 〉52 mm in length in March and April there was an exponential relationship between absolute fecundity and fish length but no relationship between relative fecundity and length. There was. however, a relationship between fish length and both gonadosomatic index and maximum egg size, which may indicate that large fish began to spawn first.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1983.tb00678.x
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  • 3
    Electronic Resource
    Electronic Resource
    Growth and production of five species of Ephemeroptera larvae from an experimental recirculating stream (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 12 (1982), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. The production and growth of the larvae of five species of Ephemeroptera in an experimental recirculating stream-channel are described. The most abundant species were Baetis rhodani, which achieved a maximum population density of c. 29,000 m-2 in August, and Ephemerella ignita which reached a density of c. 13,000 m-2 in the spring. Three other common speeies, Paraleptophlebia submarginata, Centroptilum luteolum and Caenis rivulorum were present at lower densities (〈 1000 m-2). B. rhodani had five cohorts in a year whilst C. luteolum had two or possibly three. E. ignita, C. rivulorum and P. submarginata were univoltine. Mean speeifie growth rates were calculated for each species, the maximum being 3.26±0.49% length day-1 for E. ignita (3 April—15 May). Production of each of these five species of Ephemeroptera was calculated giving a total annual production of 10.2 g dry wt m-2 (computational method).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1982.tb00607.x
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  • 4
    Electronic Resource
    Electronic Resource
    Life-history and production of the amphipod Gammarus pulex in a Dorset chalk stream (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 9 (1979), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. The seasonal variation in population density of Gammarus pulex was studied in a Dorset chalk stream. The numbers increased markedly in June and July and reached a maximum of c. 10000m−2 in September whilst the most rapid decline in density occurred in October-November and reached a minimum of 820 m−2 in February. The animals occurred in greater densities in habitats containing Ranunculus or Callitriche than in those devoid of vegetation. The population structure was determined monthly and was split into juveniles (length 〈4mm), immature males, immature females, mature males and ovigerous females. The percentage of juveniles (39–76) was always the highest of any of the categories. Ovigerous females were found at all times of the year. The sex ratio varied with the time of year both for immatures and matures, although there was approximately a 1:1 ratio for the mature individuals. Seasonal variation in biomass showed a maximum of 7.l g dry wt m−2 in September and a minimum of 1.4 g dry wt m−2 in March. Production was calculated by two methods giving values of 12.9 g dry wt m−2 year−1 and 12.8 g dry wt m−2 year−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1979.tb01508.x
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on Chironomidae in experimental recirculating stream systems. II. The growth, development and production of a spring generation of Orthocladius (Euorthodadius) calvus Pinder (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 15 (1985), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 〈list xml:id="l1" style="custom"〉1 Orthodadius (Euorthodadius) calvus Pinder. similar to Orthocladius (Euorthodadius) thienemanni Kieffer. colonized a new gravel substratum in two recirculating stream channels. A maximum population density of 68.621 m-2 was attained after only 16 days. This had fallen to a negligible density by the thirty-third day.2Some recruitment occurred over most of the study period (April-May 1981) and no single sharply defined cohort was evident. There was a large range of body lengths within each instar. and considerable overlap between instars. The population density estimates for instars I and II were low compared with instars III and IV.3The relationship between instantaneous growth rate (g) and geometric mean length indicated that growth was best described by a Gompertz curve. Growth rate decreased with increasing length from a value of about 40% length day-1 at 2 mm body length to about 5% length day-1 at 9 mm.4Growth rates for individual larvae, kept in culture, were very variable with maximum rates close to the values determined from the field data. Mean duration of larval life was 16 days.5Estimates of production for the study period ranged from 13.5 g dry wt m-2 (Channel III, size-frequency method) to 34.2 g dry wt m-2 (Channel II, Allen's graphical method, values corrected for non-linear growth).6Gut contents were estimated to represent about 55% of the total weight therefore production values should be reduced by this amount.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1985.tb00197.x
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of interaction between the stone loach Noemacheilus barbatulus (L.) and the bullhead Cottus gobio (L.) on prey and habitat selection (1991)
    Springer
    Hydrobiologia 220 (1991), S. 1-7 
    Details
    ISSN: 1573-5117
    Keywords: fish ; invertebrate prey ; rivers ; habitat preference ; selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Stone loach and bullhead were given a choice of Chironomus and Asellus prey in experiments using solitary fish and fish in company. Solitary fish ate more than fish in company. The effect of light and substratum type on feeding was investigated. Both species ate more prey items on gravel than silt when a significant difference was observed. Bullhead ate more than loach in the light on both substrata. The only experiment in which loach ate more than bullhead was on a silt substratum in the dark. It is concluded that these two species utilise different components of the available food resources in chalk streams by adopting different habitats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017487
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  • 7
    Electronic Resource
    Electronic Resource
    Gasanalytische Arbeiten (1928)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 75 (1928), S. 190-199 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01470431
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  • 8
    Electronic Resource
    Electronic Resource
    Removal of hydrogen peroxide by a 1-cysteine peroxiredoxin enzyme of the filarial parasite Dirofilaria immitis (2000)
    Springer
    Parasitology research 86 (2000), S. 200-206 
    Details
    ISSN: 1432-1955
    Keywords: AbbreviationsL3 Third-stage larvae ; L4 Fourth-stage larvae ; SOD Superoxide dismutase ; GPx Glutathione peroxidase ; TSA Thiol-specific antioxidant ; Prx Peroxiredoxin ; TPx Thioredoxin peroxidase ; E-S products Excretory-secretory products ; MCO: Metal-ion-catalyzed oxidation ; rDiPrx-1 Recombinant D. immitis 1-Cys Pxr ; DTT Dithiothreitol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Prior studies have shown that filarial nematodes can effectively metabolize hydrogen peroxide in excess of that generated by activated host cells. However, the mechanisms of H2O2 removal by the filarial parasites are unclear. Herein we report the results of studies carried out on the biochemical activity and on immunolocalization of a recombinant peroxiredoxin (Prx) enzyme from the dog filarial parasite Dirofilaria immitis. A full-length cDNA encoding a 1-Cys Prx enzyme from the dog heartworm D. immitis was expressed in Escherichia coli as a recombinant polyhistidine fusion protein (rDiPrx-1). rDiPrx-1 was capable of reducing H2O2 in the presence of dithiothreitol. The apparent kinetic constants determined for DiPrx-1 using H2O2 as a substrate were a Michaelis constant (K m) of 16.28 mM and a maximal velocity (v max) of 16 μmol min−1. Consistent with the enzyme activity, D. immitis adult worms could detoxify exogenously added H2O2 in vitro. Antibodies to rDiPrx-1 identified a 27-kDa native antigen in parasite extracts and larval and adult excretory-secretory products. The antibodies were used to localize the native antigen to the lateral hypodermal chords of both male and female worms by immunohistochemistry. In addition, labeling was seen in the afibrillar muscle cells in male worms and in some areas of the uterine wall in female worms. Thus, DiPrx-1 is the first parasite Prx to be shown to detoxify exogenously added H2O2 in an in vitro system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004360050032
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  • 9
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    Unknown
    Saddle antenna radio frequency ion sources (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-10-07
    Description: Existing RF ion sources for accelerators have specific efficiencies for H + and H − ion generation ∼3–5 mA/cm 2 kW, where about 50 kW of RF power is typically needed for 50 mA beam current production. The Saddle Antenna (SA) surface plasma source (SPS) described here was developed to improve H − ion production efficiency, reliability, and availability. In SA RF ion source, the efficiency of positive ion generation in the plasma has been improved to 200 mA/cm 2 kW. After cesiation, the current of negative ions to the collector was increased from 1 mA to 10 mA with RF power ∼1.5 kW in the plasma (6 mm diameter emission aperture) and up to 30 mA with ∼4 kW RF. Continuous wave (CW) operation of the SA SPS has been tested on the test stand. The general design of the CW SA SPS is based on the pulsed version. Some modifications were made to improve the cooling and cesiation stability. CW operation with negative ion extraction was tested with RF power up to ∼1.2 kW in the plasma with production up to Ic = 7 mA. A stable long time generation of H − beam without degradation was demonstrated in RF discharge with AlN discharge chamber.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics (AIP)
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  • 10
    facet.materialart.
    Unknown
    Gasanalytische Arbeiten (1928)
    Springer
    Details
    Publication Date: 1928-05-01
    Print ISSN: 1618-2642
    Electronic ISSN: 1618-2650
    Topics: Chemistry and Pharmacology
    Published by Springer
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