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  • Springer  (345)
  • Wiley-Blackwell
  • American Institute of Physics (AIP)
  • 2020-2022  (160)
  • 1975-1979  (207)
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  • 1
    Electronic Resource
    Electronic Resource
    On the calculation of sugar concentration in flower nectar (1979)
    Springer
    Oecologia 41 (1979), S. 301-304 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary There are several sources of potential error in calculating the concentration or energy value of floral nectar. Errors resulting from confusing data become substantial with increasing concentration. The different methods of expressing sugar concentration are here clarified, and the correct methods of converting from one to the other are provided. Refractometers in use in field studies usually read on a weight per total weight basis; this is recommended as the mode of statement. The perils of oversimplifying conversions from this mode, as is often done, are pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377434
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  • 2
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    On the calculation of sugar concentration in flower nectar (1979)
    Springer
    Details
    Publication Date: 1979-08-01
    Print ISSN: 0029-8549
    Electronic ISSN: 1432-1939
    Topics: Biology
    Published by Springer
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Polynomial interpolation and the Chinese Remainder Theorem for algebraic systems (1975)
    Springer
    Mathematische Zeitschrift 143 (1975), S. 165-174 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01187059
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Flying locust visual responses in a radial wind tunnel (1979)
    Springer
    Journal of comparative physiology 131 (1979), S. 39-47 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. In order to observe the response of a flying locust to stationary and moving patterns, a new wind tunnel has been developed, tested and described. 2. The flying locust, free to yaw and move laterally, is capable of flying stably and in a natural flight posture whilst fixated on simple visual patterns. Both rotational and translational movements were monitored by transducers. 3. Locusts can orientate towards a stripe and near but not directly towards a black-white vertical interface. 4. Removal of visual stimuli by switching off or gradually reducing the pattern illumination resulted in less accurately controlled flight in 92% of trials. 5. Locusts maintained orientation when one eye was covered. 6. Locusts responded to moving striped patterns. They could accurately follow speeds ranging from 1.2° s−1 to 90° s−1. Some animals ceased to follow the stripes after a period of time which varied from insect to insect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00613082
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  • 5
    Electronic Resource
    Electronic Resource
    The wing movements of flying locusts during steering behaviour (1979)
    Springer
    Journal of comparative physiology 131 (1979), S. 49-58 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. A flight balance is described which provides freedom for the flying locust to roll, yaw and move laterally (Fig. 1). 2. High-speed film taken from various angles of locusts manoeuvering in radial and laminar wind tunnels reveals considerable variations in phase, amplitude and pronation, particularly in the forewings, but forewing pronation is the only variable that can be reliably correlated with turning. 3. Flying locusts stimulated by a light lateral to their flight direction make a banked turn towards the light (Fig. 11). 4. Wing, leg and abdomen movements producing these banked turns are identical to those causing attempted yaw turns, and hence roll and yaw are produced by the same wing and body motions. The animal has no way of isolating yaw and roll components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00613083
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  • 6
    Electronic Resource
    Electronic Resource
    The role of bacteria in the nutrition of aquatic detritivores (1976)
    Springer
    Oecologia 24 (1976), S. 95-104 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Bacteriological analyses of the guts of four common lotic invertebrates are described. The results from these analyses suggest thatSimulium andChironomus digest at least half of the bacteria that they ingest in situ, but no evidence has been found for the digestion of bacteria byBaëtis or byEphemerella. Moreover,Simulium andChironomus do not appear to be selective, with regard to bacterial type, in their digestion. The limitations of the method are discussed and the relative importance of bacteria compared with other components of the insects' diet is assessed. Evidence is presented which supports the hypothesis that bacteria are not as quantitatively important as other components of the detrital food material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572753
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  • 7
    Electronic Resource
    Electronic Resource
    Demographic attributes of dispersing southern bog lemmings (Synaptomys cooperi) in eastern Kansas (1979)
    Springer
    Oecologia 40 (1979), S. 91-101 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Demographic attributes of southern bog lemmings colonizing two removal grids were compared with those of residents on neighboring control grids over a two year period in eastern Kansas. There was a positive association between the number of lemmings colonizing the removal grids and density of the control grids. Overall, 41% of the losses from the two control grids was accounted for by dispersal. The following differences were observed comparing residents with dispersers: 1) a greater proportion of males colonized the removal grids, 2) a lower percentage of adult females colonizing the removal grids were in breeding condition, whereas the reverse was true for subadult females, and 3) a greater proportion of subadults colonized the removal grids. These results are consistent with those obtained for other microtine species. “I don't understand”, said the scientist, “why you lemmings all rush down to the sea and drown yourselves”. “How curious”, said the lemming. “The one thing I don't understand is why you human beings don't” — from Intervie with a Lemming by James Thurber.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388813
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  • 8
    Electronic Resource
    Electronic Resource
    The role of forewing muscles in the control of direction in flying locusts (1979)
    Springer
    Journal of comparative physiology 131 (1979), S. 59-66 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Locust forewing muscles were recorded whilst the animal was free to manoeuvre. 2. First and second mesothoracic basalars (depressors) and first and second tergosternal muscles (elevators) show changes in firing patterns associated with turning. 3. The phase between left and right first basalars was subject to large and rapid changes. The phase between left and right first tergosternals changed less markedly. 4. Ipsilateral first and second basalars were not tightly linked in either burst length or phase. 5. Ipsilateral first and second tergosternals were very tightly linked in burst and phase changes. 6. The mesothoracic subalar changed its firing pattern less than any other of the muscles studied. 7. The results are discussed in relation to known pathways in the flight motor system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00613084
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  • 9
    Electronic Resource
    Electronic Resource
    Toxicity and persistence of low-level PCB in adult wistar rats, fetuses, and young (1977)
    Springer
    Archives of environmental contamination and toxicology 5 (1977), S. 143-156 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Aroclor 1254 was fed to female and male rats daily for 9 weeks at a dose of 6.4 mg/kg in their drinking water. Control animals received plain tap water plus the emulsifier (0.15% Tween 80). Elevated mixed function oxidase (MFO) activity appeared to be due to 2,4,5,2′,4′,5′- and 2,4,5,2′3′4′-hexachlorobiphenyls, since only these compounds were present to any degree in the tissues of the animals when MFO activity persisted after termination of exposure. The placenta apparently is an effective barrier to PCB transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220897
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  • 10
    Electronic Resource
    Electronic Resource
    Residues of Atrazine andN-deethylated Atrazine in water from five agricultural watersheds in Québec (1978)
    Springer
    Archives of environmental contamination and toxicology 7 (1978), S. 221-235 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) andN-deethylated atrazine (2-chloro-4-amino-6-isopropylamino-s-triazine) were monitored (1974 and 1975) in five rivers which drained agricultural areas in the Yamaska river basin of Québec. Water samples were collected frequently from April to December each year from sites near the outflow of each river. The water samples were extracted with benzene, chloroform, or ethyl acetate and the extracts were analyzed by gas chromatography using a Hall electrolytic conductivity detector and an alkali-flame detector. Atrazine andN-deethylated atrazine residues ranged in concentration from 0.01 to 26.9 μg/L and 〈0.01 to 1.34 μg/L, respectively, over the monitoring period. The highest levels of atrazine were observed in July each year and they coincided with the herbicide spraying season in this region and with occasional heavy rainfall events. Discharges (kg/yr) of atrazine from the five rivers were related to corn-growing area in each watershed. Losses of atrazine ranged from 0.1 to 2.9% of the atrazine that was estimated to have been applied in each watershed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02332051
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