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  • Articles  (38)
  • Springer  (38)
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  • Articles  (38)
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  • 1
    Electronic Resource
    Electronic Resource
    Electromagnetic perturbations of charged Kerr geometry (1976)
    Springer
    Letters in mathematical physics 1 (1976), S. 105-109 
    Details
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The freedom associated with infinitesimal co-ordinate transformations and infinitesimal tetrad rotations within the Newman Penrose formalism is used when considering electromagnetic perturbations of type D geometries. In particular, it is shown that for the charged Kerr geometry, a suitable choice of tetrad rotation leads to equations for the perturbed Newman Penrose components φ 0 and φ 2 which are closely related to those for the uncharged case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00398371
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  • 2
    Electronic Resource
    Electronic Resource
    Vegetation dynamics in impounded marshes along the Indian River Lagoon, Florida, USA (1990)
    Springer
    Environmental management 14 (1990), S. 397-409 
    Details
    ISSN: 1432-1009
    Keywords: Batis ; Impoundment ; Mangroves ; Salicornia ; Salt marsh ; Vegetation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Data are presented on the vegetation dynamics of two impounded marshes along the Indian River Lagoon, in east-central Florida, USA. Vegetation in one of the marshes (IRC 12) was totally eliminated by overflooding and by hypersaline conditions (salinities over 100 ppt) that developed there in 1979 after the culvert connecting the marsh with the lagoon was closed. Over 20% recovery of the herbaceous halophytesSalicornia virginica, S. bigelovii, andBatis maritima was observed at that site after the culvert was reopened in 1982, but total cover in the marsh remains well below the original 75%. No recovery of mangroves was observed at this site. The second site (SLC 24), while remaining isolated from the lagoon during much of the study, did not suffer the complete elimination of vegetation experienced at the first site. At this location, mangroves increased in cover and frequency with a concomitant decrease in herbaceous halophytes. Considerable damage to the vegetation was evident at IRC 12 when the impoundment was closed and flooded for mosquito control in 1986. Although the damage was temporary, its occurrence emphasizes the need of planning and constant monitoring and adjustment of management details as conditions within particular marshes change. Storms and hurricanes may be important in promoting a replacement of black mangroves by red mangroves in closed impoundments because the former cannot tolerate pneumatophore submergence for long periods of time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02394208
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  • 3
    Electronic Resource
    Electronic Resource
    Karyotypes and DNA values for members of the suborder Esocoidei (Osteichthyes: Salmoniformes) (1971)
    Springer
    Chromosoma 34 (1971), S. 436-447 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Karyotypes prepared from tissues of gills, gonads, fins, liver, and spleen, yielded the following diploid numbers: all Esox spp. 50, all Umbra spp. (excluding U. krameri) 22, Novumbra hubbsi 48, Dallia pectoralis 78. DNA measurements from Feulgen stain content of erythrocytes, indicated that the species could be divided into two categories: 30–39% of human-Esox spp., Dallia pectoralis, Novumbra hubbsi: 70% of human-Umbra spp. Chromosomal polymorphism was not observed among the various tissues examined nor was it observed among specimens from different habitats. Both the karyotypes and the DNA values indicated that the present tendency to combine the genera Umbra, Novumbra, and Dallia in the single family Umbridae may be ill advised.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326315
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular mapping of the py-1 gene for resistance to corky root rot (Pyrenochaeta lycopersici) in tomato (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 784-788 
    Details
    ISSN: 1432-2242
    Keywords: Key words CAP ; py-1 ; RAPD ; RFLP ; Breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We report the molecular mapping of the py-1 gene for resistance to corky root rot [Pyrenochaeta lycopersici (Schneider and Gerlach)] in tomato using RAPD and RFLP marker analysis. DNA from near-isogenic lines (NILs) of tomato differing in corky root rot resistance was screened with 575 random oligonucleotide primers to detect polymorphic DNAs linked to py-1. Three primers (OPW-04, OPC-02, OPG-19) revealed polymorphisms between the NILs. Twelve resistant and eight susceptible DNA pools derived from segregating F3 families were used to confirm that the RAPD markers were linked to the py-1 gene. Two of the linked amplified fragments, corresponding to OPW-04 and OPC-02, were subsequently cloned and mapped on the tomato molecular linkage map as RFLPs. These clones were located between TG40 and CT31 on the short arm of chromosome 3. Further analysis with selected RFLP markers showed that 7% (8.8 cM) of chromosome 3 of the resistant line ‘Moboglan’ was introgressed from the L. peruvianum donor parent. Three RFLP markers (TG40, TG324, and TG479) from the introgressed part of chromosome 3 were converted to cleaved amplified polymorphism (CAP) markers for use in a polymerase chain reaction (PCR) assay. These PCR markers will allow rapid large-scale screening of tomato populations for corky root rot resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050956
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  • 5
    Electronic Resource
    Electronic Resource
    Chromosomal localization and molecular-marker tagging of the powdery mildew resistance gene (Lv) in tomato (1994)
    Springer
    Theoretical and applied genetics 89 (1994), S. 76-79 
    Details
    ISSN: 1432-2242
    Keywords: Powdery mildew (Leveillula taurica) ; Tomato ; RAPD ; RFLP ; Lv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We report the tagging of a powdery mildew [Leveillula taurica (Lév.) Arnaud.] resistance gene (Lv) in tomato using RAPD and RFLP markers. DNA from a resistant (cv Laurica) and a susceptible cultivar were screened with 300 random primers that were used to amplify DNA of resistant and susceptible plants. Four primers yielded fragments that were unique to the resistant line and linked to the resistance gene in an F2 population. One of these amplified fragments, OP248, with a molecular weight of 0.7 kb, was subsequently mapped to chromosome 12, 1 cM away from CT134. Using RFLP markers located on chromosome 12, it was shown that approximately one half of chromosome 12 (about 42 cM), in the resistant variety is comprised of foreign DNA, presumably introgressed with the resistance gene from the wild species L. chilense. Further analysis of a backcross population revealed that the Lv gene lies in the 5.5-cM interval between RFLP markers, CT211 and CT219. As a prelude to map-based cloning of the Lv gene, we are currently enriching the density of markers in this region by a combination of RAPD primers and other techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226986
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  • 6
    Electronic Resource
    Electronic Resource
    High-resolution genetic map of the Lv resistance locus in tomato (1997)
    Springer
    Theoretical and applied genetics 95 (1997), S. 220-223 
    Details
    ISSN: 1432-2242
    Keywords: Key words Powdery mildew (Leveillula taurica) ; Tomato-RAPD-RFLP ; Marker-assisted breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Bulked segregant analysis and high-resolution mapping were used to pinpoint the position of the Lv gene for resistance to Leveillula taurica in tomato. Mapping in an F2, corresponding to more than 3800 gametes, indicates that Lv is positioned within the 0.84-cM interval defined by the RFLP markers CT121 and CT129, with the closest marker, CT121, being only 0.16 cM from the gene. The tight linkage of these markers demonstrates their usefulness in marker-assisted breeding for Lv, and the high-resolution map provides a starting a starting point for positional cloning of this resistance gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050551
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  • 7
    Electronic Resource
    Electronic Resource
    Hunger-dependent predator inspection and foraging behaviours in the threespine stickleback (Gasterosteus aculeatus) under predation risk (1994)
    Springer
    Behavioral ecology and sociobiology 34 (1994), S. 359-366 
    Details
    ISSN: 1432-0762
    Keywords: Predation risk ; Hunger ; Predator inspection ; Foraging ; Fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Individual fish commonly leave the relative safety of the shoal to approach potential predators at a distance. Not all members of a shoal are equally likely to initiate such predator inspection visits. Here, we show for the first time that the current hunger state of individual fish strongly influences their predator inspection behaviour, as well as their foraging rate, in the face of predation hazard. When all members of threespine stickleback (Gasterosteus aculeatus) test shoals were in a similar hunger state, they were equally likely to inspect a trout predator model alone and did not differ in the frequency of their inspection visits or foraging rate. However, when individual sticklebacks in a shoal differed in their hunger state, the food-deprived (i.e. hungrier) member of the shoal fed at a higher rate, was significantly more likely to initiate solitary predator inspection visits, and inspected the predator model significantly more often than its less hungry (i.e. well-fed) shoal mates. Individual fish which inspected the predator model more frequently also tended to have higher feeding rates. The results indicate that the hungrier fish in a shoal are more willing to take greater risks to inspect a potential threat at a distance, compared with their well-fed shoal mates, and suggest that they may gain a foraging benefit in doing so. If marked asymmetries in hunger state exist among members of fish shoals, then mutual cooperation during predator inspection visits may be difficult to achieve because well-fed individuals are not as likely to initiate or participate in inspection visits as are hungry individuals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209782
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  • 8
    Electronic Resource
    Electronic Resource
    Hunger-dependent predator inspection and foraging behaviours in the threespine stickleback (Gasterosteus aculeatus) under predation risk (1994)
    Springer
    Behavioral ecology and sociobiology 34 (1994), S. 359-366 
    Details
    ISSN: 1432-0762
    Keywords: Key words: Predation risk ; Hunger ; Predator inspection ; Foraging ; Fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Individual fish commonly leave the relative safety of the shoal to approach potential predators at a distance. Not all members of a shoal are equally likely to initiate such predator inspection visits. Here, we show for the first time that the current hunger state of individual fish strongly influences their predator inspection behaviour, as well as their foraging rate, in the face of predation hazard. When all members of threespine stickleback (Gasterosteus aculeatus) test shoals were in a similar hunger state, they were equally likely to inspect a trout predator model alone and did not differ in the frequency of their inspection visits or foraging rate. However, when individual sticklebacks in a shoal differed in their hunger state, the food-deprived (i.e. hungrier) member of the shoal fed at a higher rate, was significantly more likely to initiate solitary predator inspection visits, and inspected the predator model significantly more often than its less hungry (i.e. well-fed) shoal mates. Individual fish which inspected the predator model more frequently also tended to have higher feeding rates. The results indicate that the hungrier fish in a shoal are more willing to take greater risks to inspect a potential threat at a distance, compared with their well-fed shoal mates, and suggest that they may gain a foraging benefit in doing so. If marked asymmetries in hunger state exist among members of fish shoals, then mutual cooperation during predator inspection visits may be difficult to achieve because well-fed individuals are not as likely to initiate or participate in inspection visits as are hungry individuals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209782
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  • 9
    Electronic Resource
    Electronic Resource
    Hunger-dependent predator inspection and foraging behaviours in the threespine stickleback (Gasterosteus aculeatus) under predation risk (1994)
    Springer
    Behavioral ecology and sociobiology 34 (1994), S. 359-366 
    Details
    ISSN: 1432-0762
    Keywords: Predation risk ; Hunger ; Predator inspection ; Foraging ; Fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Individual fish commonly leave the relative safety of the shoal to approach potential predators at a distance. Not all members of a shoal are equally likely to initiate such predator inspection visits. Here, we show for the first time that the current hunger state of individual fish strongly influences their predator inspection behaviour, as well as their foraging rate, in the face of predation hazard. When all members of threespine stickleback (Gasterosteus aculeatus) test shoals were in a similar hunger state, they were equally likely to inspect a trout predator model alone and did not differ in the frequency of their inspection visits or foraging rate. However, when individual sticklebacks in a shoal differed in their hunger state, the food-deprived (i.e. hungrier) member of the shoal fed at a higher rate, was significantly more likely to initiate solitary predator inspection visits, and inspected the predator model significantly more often than its less hungry (i.e. well-fed) shoal mates. Individual fish which inspected the predator model more frequently also tended to have higher feeding rates. The results indicate that the hungrier fish in a shoal are more willing to take greater risks to inspect a potential threat at a distance, compared with their well-fed shoal mates, and suggest that they may gain a foraging benefit in doing so. If marked asymmetries in hunger state exist among members of fish shoals, then mutual cooperation during predator inspection visits may be difficult to achieve because well-fed individuals are not as likely to initiate or participate in inspection visits as are hungry individuals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197006
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  • 10
    Electronic Resource
    Electronic Resource
    Estimation of the cure rate of epichlorohydrin/bisphenol a type epoxy resins (1971)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 253 (1971), S. 279-283 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A new method is described for estimating the curing rates of epichlorohydrin/bisphenol A epoxy resins cured with complex amines or polyamides. The ground-up resins are suspended in p-dioxane and reacted for 30 min with an excess of hydrogen bromide generated in situ. The excess halide is then titrated potentiometrically with mercuric perchlorate, using a bromide-selective indicator electrode in conjunction with an expanded-scale pH meter. Results are in agreement with those obtained by following the disappearance of the oxirane absorption band at 10.95 μm. Average error was 0.9%.
    Notes: Zusammenfassung Ein neues Verfahren wird beschrieben für Epoxyharze, die mit komplexen Aminen oder Polyamiden gehärtet wurden. Die gemahlenen Harze werden in p-Dioxan suspendiert und 30 min der Reaktion mit überschüssigem, in situ erzeugtem Bromwasserstoff unterworfen. Der Überschuß wird dann potentiometrisch mit Quecksilberperchlorat titriert, wobei eine bromidselektive Indicatorelektrode in Verbindung mit einem pH-Meter mit Skalendehnung benutzt wird. Die Ergebnisse stimmen mit denjenigen überein, die durch Verfolgung des Verschwindens der Oxiran-Absorptionsbande bei 10,95 μm erhalten wurden. Der durchschnittliche Fehler lag bei 0,9%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430087
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