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  • Springer  (170)
  • Nature Publishing Group  (7)
  • American Physical Society (APS)  (4)
  • 1
    Electronic Resource
    Electronic Resource
    The geological results of measurements of gravity in East Carmarthenshire (1955)
    Springer
    Pure and applied geophysics 32 (1955), S. 43-53 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Observations of gravity over the Palaeozoic rocks of East Carmarthenshire show this to be an area of positive Bouguer anomalies, and throughout the district the isogams are aligned in a «Caledonoid» direction. The regional gradient over the anthracite coalfield can largely be explained in terms of known structure, while the anomaly values in the Towy valley above Llandeilo seem to have been affected by facies variations and contemporaneous volcanic activity. Fairly large anomalies are recorded near Carmarthen, and these may be associated with similar anomalies known near Aberystwyth (Cook & Thirlaway, 1950); they are interpreted as an expression of the Welsh geosyncline. The gravity low discovered in St. George's Channel byBrowne & Cooper (1950) is re-interpreted in terms of the depth of the pre-Palaeozoic floor. There is no marked evidence to indicate the presence of a concealed «granitic» intrusion beneath the coalfield, nor to substantiate the view that there was once a great thickness of Permian or later cover.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01993595
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  • 2
    Electronic Resource
    Electronic Resource
    The echo response inGnathonemus petersii (Mormyridae) (1974)
    Springer
    Journal of comparative physiology 92 (1974), S. 181-200 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Gnathonemus petersii respond to each other's electric organ discharge (EOD) with an “echo” discharge of their own at a latency of about 12 msec. This response persists until interfish distances reach about 30 cm (Fig. 4). 2. Artificial electrical stimuli were used to further characterize the response. Response threshold, latency dependence on stimulus intensity, polarity characteristics (Figs. 5–7), and differential regional sensitivity indicate that “medium” electroreceptors in the anterior region of the animal underlie the response. 3. Response probability depends upon the delay of the stimulus after the last EOD and also upon the instantaneous EOD rate (Figs. 8, 9). The echo response in turn resets the EOD rhythm of the responding animal (Fig. 10). These results suggest that the echo input pathway terminates on the presumed mesencephalic command center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694505
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  • 3
    Electronic Resource
    Electronic Resource
    Electric organ discharge patterns during dominance related behavioral displays inGnathonemus petersii (Mormyridae) (1974)
    Springer
    Journal of comparative physiology 92 (1974), S. 201-228 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. The electric organ discharge (EOD) patterns seen in pairs of mormyrid fishes (Gnathonemus petersii) during displays related to aggression and establishment of dominance are described. 2. A new method of reliably separating the discharges of the two fish was used. In this method a fine wire was attached to the tail of one animal (Fig. 1). 3. Discharge patterns were examined at different stages during the characteristic sequence of overt behavioral events which usually occurred after an intruder was put into a tank in which another fish of the same species had been resident for 1 hour or more. The resident attacked the intruder immediately, the intruder being initially unresponsive. After a few minutes, however, the two fish entered into intense, mutual, antiparallel displays (Fig. 2). The displays occurred repeatedly during a period of 0.5–30 min. This period ended suddenly with one of the fish clearly dominant as shown by one-sided attacks and avoiding behavior by the submissive fish. 4. All attacks were accompanied by a smooth acceleration to a high discharge rate which was usually terminated abruptly (Fig. 3). Anti-parallel behavior was accompanied by similar accelerations in both fish. Interdischarge intervals during these high rates changed discretely between those of about 15 msec and those of about 9 msec (Figs. 3–9). Initial attacks before the antiparallel period usually produced no effect or a brief acceleration in the discharges of the attacked animal. Similar attacks when dominance was well established caused a slowing of the discharge rate of the attacked fish. 5. The echo response in which one fish responds to the EOD of another with a discharge of its own at a latency between 11 and 14 msec was seen at all stages of the encounter. This latency corresponded rather exactly to the gap in the interval histogram between the shorter intervals around 9 msec and the longer ones around 15 (Figs. 11, 12). This correspondence led to a degree of avoidance of near synchronous discharges during those attacks which did not cause either slowing or accelerations in the attacked animal (Fig. 11). A degree of synchrony avoidance also occurred during the mutually high discharge rates of antiparallel behavior. This resulted from the phase locking of the two discharge trains which was often present at these times and which was probably due to the echo responses (Fig. 13). 6. Several features of the individual discharge trains and of their interaction were examined during the period of antiparallel activity. This was done in order to see if some critical parameter could be detected which would allow one to predict the winner of the encounter and which might be used as a signal by the fish themselves. No single feature among those we examined was clearly and consistently related to the outcome of the encounter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694506
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  • 4
    Electronic Resource
    Electronic Resource
    A Methyl Cytidine from the Ribonucleic Acid of Anacystis nidulans (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 238-239 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Freshly harvested cells grown in a continuous culture chamber1 were used for isolating ribonucleic acid from Anacystis nidulans. It was found that the method of Ogur and Rosen2 was most suitable. Ribonucleic acid constitutes 0 -37-0 -50 per cent of the fresh weight of the cells. Ribonucleic acid ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/186238a0
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  • 5
    Electronic Resource
    Electronic Resource
    Hive-Bees do not necessarily Sacrifice their Lives when they Sting (1934)
    [s.l.] : Nature Publishing Group
    Nature 134 (1934), S. 290-290 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MY scepticism regarding the frequent statement, for example, Bischoff1, that worker bees (Apis mellifica) cannot withdraw their barbed sting, and thus invariably die when they have stung, was first aroused by observing a raid by wasps (Vespa germanica) on a hive in Essex, in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/134290b0
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of Antibody in vitro by Lymph Node Fragments using Absorbable Gelatin Sponges (1966)
    [s.l.] : Nature Publishing Group
    Nature 210 (1966), S. 645-645 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Young, adult New Zealand rabbits were immunized with rat serum albumin (RSA) (prepared by ammonium sulphate fractionation of whole rat serum, pure by the criterion of immunoelectrophoresis) and bovine serum albumin (BSA) (obtained from Pentex Incorporated, Kankakee, Illinois). The rabbits were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/210645a0
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of Zirconium Additions on the Epsilon Phase of the Titanium-Aluminium System (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 183-184 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Eighteen experimental alloys were prepared from high-purity aluminium (99-99 per cent), titanium (99-99 per cent), and zirconium (99-72 per cent Zr containing 0-21 per cent Hf). Twenty-gram button specimens of each composition, as indicated in Fig. 1, were arc-melted in a high-purity argon-helium ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/207183a0
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  • 8
    Electronic Resource
    Electronic Resource
    Population fluctuations of the western tent caterpillar in southwestern British Columbia (2000)
    Springer
    Population ecology 42 (2000), S. 231-241 
    Details
    ISSN: 1437-5613
    Keywords: Key words Population cycles ; Nucleopolyhedrovirus ; NPV ; Insect quality ; Metapopulation ; Island populations ; Forest tent caterpillars ; Sublethal disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cyclic populations of western tent caterpillars fluctuate with a periodicity of 6–11 years in southwestern British Columbia, Canada. Typically, larval survival is high in early stages of the population increase, begins to decline midway through the increase phase, and is low through several generations of the population decline. Fecundity is generally high in increasing and in peak populations but is also reduced during the population decline. Poor survival and low fecundity for several generations cause the lag in recovery of populations that is necessary for cyclic dynamics. The dynamics of tent caterpillar populations vary among sites, which suggests a metapopulation structure; island populations in the rainshadow of Vancouver Island have more consistent cyclic dynamics than mainland populations in British Columbia. Sudden outbreaks of populations that last a single year suggest that dispersal from source to sink populations may occur late in the phase of population increase. Wellington earlier discussed qualitative variation among tent caterpillar individuals as an aspect of population fluctuations. The variation in caterpillar activity he observed was largely statistically nonsignificant. Recent observations show that the frequency of elongate tents as described by Wellington to characterize active caterpillars varies among populations but does not change in a consistent pattern with population density. The level of infection from nucleopolyhedrovirus (NPV) was high in some populations at peak density but was not associated with all population declines. Sublethal infection can reduce the fecundity of surviving moths, and there is a weak association between viral infection and egg mass size in field populations. The impact of weather in synchronizing or desynchronizing populations is a factor to be investigated further.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00012002
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  • 9
    Electronic Resource
    Electronic Resource
    The age of (a tiny part of) the Australian continent (1985)
    [s.l.] : Nature Publishing Group
    Nature 317 (1985), S. 559-560 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SCH„RER and All¨gre1, using isotope dilution analysis of single grains and fragments of zircon, recently failed to substantiate a report by Froude et al.2, based on the ion microprobe SHRIMP3, of zircons older than 4,100 Myr from Mt Narryer, Western Australia. In their discussion, Sch¤rer and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/317559c0
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  • 10
    Electronic Resource
    Electronic Resource
    Ion microprobe identification of 4,100–4,200 Myr-old terrestrial zircons (1983)
    [s.l.] : Nature Publishing Group
    Nature 304 (1983), S. 616-618 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Simplified geological map of the Mt Narryer region showing:o·, Location of dated gneisses with Sm-Nd model ages1 in Myr. +, Location of quartzite samples (+A, GSWA sample site 71932; +B, GSWA sample sites 71921 and 71924). The quartzites in which the zircons occur are part of a thick ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/304616a0
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