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  • 1
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    Radiocarbon dates from the Akrotiri excavations (1990)
    In:  EPIC3Thera and the Aegean World III Proceedings of the 3rd International Congress, Santorini, Greece, 1989 (D A Hardy, A C Renfrew, eds ) Thera Foundation, London,3, Chronology, pp. 179-187
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 2
    Electronic Resource
    Electronic Resource
    Dependence of bump rate and bump size in Limulus ventral nerve photoreceptor on light adaptation and calcium concentration (1980)
    Springer
    European biophysics journal 6 (1980), S. 271-285 
    Details
    ISSN: 1432-1017
    Keywords: Limulus photoreceptor ; Bump ; Light adaptation ; Extracellular calcium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Bumps were recorded in Limulus ventral nerve photoreceptor as deflections in membrane voltage during 10 s illuminations by dim light which were repeated every 20 s. The bump amplitude vs frequency distribution and its dependence on the intensity of a preadapting light flash are described. Light adaptation which diminishes the average bump amplitude alters the character of the bump amplitude distribution from a curve with a convex region to a continuously falling concave curve. Weak light adaptation can increase frequency (and height) of the bumps elicited by constant stimuli. Raising the external Ca2+-concentration from 10 to 40 mmol/l augments the effect of a preadapting light flash in diminishing the bump amplitudes and also increases the bump frequency. The results are consistent with the assumptions that light adaptation is based on a Ca2+-dependent reduction of the amplification factor which determines the bump size and that the coupling between light induced rhodopsin reactions and bump generation is Ca2+-dependent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00538228
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  • 3
    Electronic Resource
    Electronic Resource
    Calcium deficiency in Limulus photoreceptors causes a change in the latency distribution of bumps (1981)
    Springer
    European biophysics journal 7 (1981), S. 344-344 
    Details
    ISSN: 1432-1017
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02425474
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  • 4
    Electronic Resource
    Electronic Resource
    Bump latency distribution and bump adaptation of limulus ventral nerve photoreceptor in varied extracellular calcium concentrations (1983)
    Springer
    European biophysics journal 9 (1983), S. 329-339 
    Details
    ISSN: 1432-1017
    Keywords: Limulus photoreceptor ; Bump latencies distribution ; Bump amplitudes ; Light adaptation ; Extracellular calcium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract 1) Bumps were recorded as voltage signals following dim flashes of light. Bump amplitude and width did not much depend upon external Ca2+-concentration. However, the distribution of bump latencies was strongly shifted to longer latencies and broadened more than two-fold when the external Ca2+-concentration was lowered from 10 mmol/l to 0.25 mmol/l. Raising the external Ca2+-concentration to 40 mmol/l had the opposite effect. A preadapting light flash caused shortening and narrowing of bump latency distribution similar to the effect of raised external Ca2+-concentration. 2) The bump amplitude is not correlated with the length of the latent period of the bump, indicating that the amplification processes determining the bump size are distinctly different from those which determine the latent period. 3) In a 10 s light/10 s dark cycle, a weak preadapting light flash slightly enlarges, a stronger flash diminishes the average bump amplitude (bump adaptation). The Calcium dependence of bump adaptation which was studied for external Ca2+-concentrations ranging from 〈 1 nmol/l to 100 mmol/l is relatively weak: Lowering the external Ca2+-concentration to 〈 1 nmol/l reduces, raising it to 40 mmol/l Ca2+ slightly intensifies the diminution of bump size due to light adaptation. 4) The average amplitude of the “light bumps” (recorded during the 10 s light period) is larger than that of the “dark bumps” (recording during the dark period), because the light-evoked bumps are on the average larger than the spontaneously generated bumps. 5) A preadapting light flash increases the rate both of light-evoked, and of spontaneous bumps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00535668
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  • 5
    Electronic Resource
    Electronic Resource
    EFFECT OF SELECTED SOLUTES ON GROWTH AND RECOVERY OF A RADIATION-RESISTANT Moraxella SP. (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A highly radiation-resistant Moraxella sp. from beef was more resistant to gamma radiation in frozen beef than Clostridium botulinum 33A spores. Even though the Moraxella sp. was extremely radiation-resistant, its recovery after irradiation was markedly influenced by the plating medium. Fewer colony-forming units were recovered in Tryptic Soy Agar (TSA) than in Plate Count Agar (PCA), and differences in recovery became more pronounced with increasing radiation dose. Growth studies of the nonirradiated Moraxella sp. suggested the presence of dialyzable inhibitory factor(s) in Trypticase Soy Broth (TSB) and TSA. The low (0.5%) concentration of NaCl in TSA was shown to be mainly responsible for the slow growth and reduced recovery after irradiation. Reduced recovery was also obtained by plating the Moraxella sp. in PCA plus 0.5% NaCl or PCA plus 6% glucose after irradiation. It was noted that 2 other highly radiation-resistant isolates identified as Moraxella sp. gave similar results. Sensitivity to low solute concentrations, therefore, appeared to be a general phenomenon for this group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1978.tb02497.x
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  • 6
    Electronic Resource
    Electronic Resource
    EFFECT OF IRRADIATION TEMPERATURE AND DRYING ON SURVIVAL OF HIGHLY RADIATION-RESISTANT BACTERIA IN COMPLEX MENSTRUA (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of temperature and water availability on the shape of the sigmoidal radiation inactivation curves of highly resistant bacteria was determined. The resistance of Micrococcus radiodurans and Moraxella sp. to gamma radiation was much higher in ground beef at subfreezing temperatures (-30 + 10°C) than at ambient temperatures (20-37°C). Irradiation in the frozen state lengthened the shoulder (phase of resistance prior to simple exponential death rate) of the inactivation curve. An even greater extension of the shoulder and protective effect resulted after lyophilization of Moraxella sp. Radiation sensitivity in the dry state was not temperature dependent. Lyophilized samples that had subsequently absorbed water exhibited greater sensitivity to radiation with a shorter shoulder on the inactivation curve. These results indicated that the effectiveness of irradiation in inactivating radiation-resistant bacteria in foods is highly dependent on the microenvironment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb09130.x
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  • 7
    Electronic Resource
    Electronic Resource
    Iodide ion-sensitive field-effect structures
    Amsterdam : Elsevier
    Sensors and Actuators B: Chemical 15 (1993), S. 192-194 
    Details
    ISSN: 0925-4005
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0925-4005(93)85049-G
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  • 8
    Electronic Resource
    Electronic Resource
    Penetration depth, microwave surface resistance, and gap ratio in NbN and Ba1−xKxBiO3 thin films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 244-246 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report values of the zero temperature magnetic penetration depth λ(0), microwave surface resistance Rs, and gap ratio 2Δ(0)/kBTc in technologically useful thin films of NbN and Ba1−xKxBiO3. A novel analysis technique was used to extract the absolute magnitude of λ(0) and 2Δ(0)/kBTc from shifts in resonant frequency of a parallel-plate resonator. For NbN and Ba1−xKxBiO3 values of λ(0)=3900±200 A(ring) and 3300±200 A(ring) were obtained, respectively. The gap ratios were found to be 2Δ(0)/kBTc=4.1±0.1 and 3.8±0.5, respectively, for Tc=16.3 K in NbN and Tc=17.2 K in Ba1−xKxBiO3. The surface resistance measurements on Ba1−xKxBiO3 represent the lowest values ever reported at microwave frequencies in this material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111517
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  • 9
    Electronic Resource
    Electronic Resource
    Fe-doped sodium aluminosilicate thin films: conductivity, microstructural organization and sensor properties
    Amsterdam : Elsevier
    Solid State Ionics 74 (1994), S. 165-178 
    Details
    ISSN: 0167-2738
    Keywords: Conductivity ; Microstructure ; Sensor ; Thin films
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-2738(94)90207-0
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  • 10
    Electronic Resource
    Electronic Resource
    Surface- and microanalytical characterization of ion-implanted Si-C-N layers (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 630-633 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The development of production methods for carbonitridic hard coatings needs information on depth distributions of the layer components as well as on stoichiometries and binding states of the layer constituents. Si-C-N samples were produced by implanting 13C- and 15N-ions into c-Si 〈111〉, and the implanted layers were investigated by means of NRA depth profiling. Afterwards several samples were characterized by surface analytical techniques, and XPS- and AES depth profiles were measured for typical samples. The measurements confirm the NRA depth profiles and stoichiometries. Furthermore, in all depth ranges C 1s- and N 1s binding energies are observed which are consistent with those of carbonitrides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050973
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