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  • 1
    Electronic Resource
    Electronic Resource
    Demonstration of an optical pipeline adder and design concepts for its microintegration
    Amsterdam : Elsevier
    Optics and Laser Technology 26 (1994), S. 229-237 
    Details
    ISSN: 0030-3992
    Keywords: micro-optics ; optical adder ; optical computing ; space-variant systems ; symbolic substitution ; systolic arrays
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0030-3992(94)90107-4
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  • 2
    Electronic Resource
    Electronic Resource
    Microbially — related redox changes in a subtropical lake I.In situ monitoring of the annual redox cycle (1993)
    Springer
    Biodegradation 21 (1993), S. 1-19 
    Details
    ISSN: 1572-9729
    Keywords: Lake Kinneret ; pe-pH2S dependency ; pe value ; redox cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Using a recently developedin situ multiprobe the redox development in the water column of warm-monomictic Lake Kinneret was investigated during three annual cycles. During the time when sulfide release into the meta- and hypolimnion is initiated, our measurements show a linear relationship, close to the thermodynamic function, between the platinum electrode potential and the amount of sulfide produced by the sulfate reducing bacteria. A change of this relationship during summer stratification coincides with the bloom of the phototrophic sulfur bacteriumChlorobium phaeobacteroides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002685
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  • 3
    Electronic Resource
    Electronic Resource
    Microbially — related redox changes in a subtropical lake 2. Simulation of metalinmetic conditions in a chemostat (1993)
    Springer
    Biodegradation 21 (1993), S. 21-38 
    Details
    ISSN: 1572-9729
    Keywords: chemostat ; pe-pH2S dependency ; pe values ; redox simulations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The individual influence of sulfate reducing and brown phototrophic sulfur bacteria from Lake Kinneret on the metalimnetic redox conditions was investigated by simulating the hydrochemical and microbiological conditions in a specially designed chemostat. The results show a strong correlation between measured redox values and the prevailing hydrogen sulfide concentration leading to a linear relationship. Changes in this relationship allowed differentiation between the on-going microbial processes, sulfate reduction and sulfide oxidation. The comparison ofin vitro andin situ redox values shows that the results of the simulation experiments agree with the data previously measured in the metalimnion of Lake Kinneret.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002686
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  • 4
    Electronic Resource
    Electronic Resource
    Seiche-Induced Resuspension in Lake Kinneret: A Fluorescent Tracer Experiment (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 123-131 
    Details
    ISSN: 1573-2932
    Keywords: fluorescent tracers ; boundary mixing ; sediment resuspension ; sediment traps ; Lake Kinneret ; seiches
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In warm-monomictic Lake Kinneret, wind-induced internal waves with amplitudes of up to 10 meters are common during April October. This study was aimed to follow the horizontal and vertical transport of resuspended particles due to internal wave activity using fluorescently-dyed sediment particles (lake sediments and lyophilized algal cells) as tracers. Color-coded (5 colors) tracers were deployed along a transect perpendicular to the shore, and their dispersion was followed by recovery of labeled particles in sediment traps and in bottom sediment samples using epifluorescence microscopy. Wind-induced internal seiches as the driving force for resuspension were followed using a thermistor chain and a current velocity profiler. Examination of sediment trap and bottom sediment samples indicated particle transport from the hypolimnion to the epilimnion that could be linked to the seiche activity. Horizontal transport of particles was most distinct for littoral sediments whereby particles placed at 5 m depth were exposed to a strong long shore transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018332332430
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  • 5
    Electronic Resource
    Electronic Resource
    Seiche-induced resuspension in Lake Kinneret: A fluorescent tracer experiment (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 123-131 
    Details
    ISSN: 1573-2932
    Keywords: fluorescent tracers ; boundary mixing ; sediment resuspension ; sediment traps ; Lake Kinneret ; seiches
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In warm-monomictic Lake Kinneret, wind-induced internal waves with amplitudes of up to 10 meters are common during April – October. This study was aimed to follow the horizontal and vertical transport of resuspended particles due to internal wave activity using fluorescently-dyed sediment particles (lake sediments and lyophilized algal cells) as tracers. Color-coded (5 colors) tracers were deployed along a transact perpendicular to the shore, and their dispersion was followed by recovery of labeled particles in sediment traps and in bottom sediment samples using epifluorescence microscopy. Wind-induced internal seiches as the driving force for resuspension were followed using a thermistor chain and a current velocity profiler. Examination of sediment trap and bottom sediment samples indicated particle transport from the hypolimnion to the epilimnion that could he linked to the seiche activity. Horizontal transport of particles was most distinct for littoral sediments whereby particles placed at 5 m depth were exposed to a strong long shore transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02406851
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  • 6
    Electronic Resource
    Electronic Resource
    Factors Regulating the Flux of Phosphate at the Sediment - Water Interface of a Subtropical Calcareous Lake: a Simulation Study with Intact Sediment Cores (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 401-409 
    Details
    ISSN: 1573-2932
    Keywords: phosphorus ; P flux ; microbial activity ; redox ; simulation ; Lake Kinneret ; sediment ; accumulative P release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Different factors which interactively control the flux of soluble reactive phosphorus (SRP) at the sediment-water interface (SWI) of Lake Kinneret were studied seasonally. The influence of pH, Eh and microbial activity on SRP flux at the SWI was investigated by manipulating the conditions in the overlying water of intact sediment cores. The calculated diffusive SRP flux out of the sediment was lower in cores sampled during winter and spring than during the period of amixis. Potential SRP release, as measured in the absence of microbial activity, was strongly enhanced upon the transition from oxic to anoxic conditions indicating P release from iron(III)-bound phosphorus. In spring and summer cores, an enhanced SRP flux from sediments at pH 7 in comparison to pH 8 indicated P release from carbonate-bound P which sedimented previously as result of high pH values during the algal spring bloom. Microbial uptake at the SWI was the most important sink for SRP and no net-flux occured under oxic conditions. The higher net-flux of P under anoxic conditions was linked to carbon limitation of the bacteria at the SWI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018335305539
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  • 7
    Electronic Resource
    Electronic Resource
    Factors regulating the flux of phosphate at the sediment — water interface of a subtropical calcareous lake: A simulation study with intact sediment cores (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 401-409 
    Details
    ISSN: 1573-2932
    Keywords: phosphorus ; P flux ; microbial activity ; redox ; simulation ; Lake Kinneret ; sediment ; accumulative P release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Different factors which interactively control the flux of soluble reactive phosphorus (SRP) at the sediment water irterface (SWI) of Lake Kinneret were studied seasonally. The influence of pH, Eh and microbial activity on SRP flux at the SWI was investigated by manipulating the conditions in the overlying water of intact sediment cores. The calculated diffusive SRP flux out of the sediment was lower in cores sampled during winter and spring than during the period of amixis. Potential SRP release, as measured in the absence of microbial activity, was strongly enhanced upon the transition from oxic to anoxic conditions indicating P release from iron(III)-bound phosphorus. In spring and summer cores, an enhanced SRP flux from sediments at pH 7 in comparison to pH 8 indicated P release from carbonate-bound P which sedimented previously as result of high pH values during the algal spring bloom. Microbial uptake at the SWI was the most important sink for SRP and no net-flux occured under oxic conditions. The higher net-flux of P under anoxic conditions was linked to carbon limitation ofthe bacteria at the SWI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02406880
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  • 8
    Electronic Resource
    Electronic Resource
    General water chemistry and quality in newly-created subtropical wetland lake (1998)
    Springer
    Wetlands ecology and management 6 (1998), S. 121-132 
    Details
    ISSN: 1572-9834
    Keywords: Lake Agmon ; Lake Hula ; Lake Kinneret ; phosphorus ; water quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sixty km2 of the southern Hula Valley (northern Israel) peat lands were flooded in 1994 as part of the Hula Valley Restoration Project. The small, shallow lake (110 ha, mean depth 〈 1 m) and network of ca. 90 km of canals created were designed to ameliorate problems (e.g., underground fires, soil subsidence, increased nutrient loading downstream to Lake Kinneret) resulting from drying the Lake Hula wetlands in the 1950s. This new wetland area now serves as the focus for developing eco-tourism in northern Israel. The initial development of this new ecosystem has been followed closely by a multi-disciplinary team of researchers, with an emphasis on water quality in the new lake and the potential impact of the project on Lake Kinneret. Here we report an overview of developments in general water chemistry of Lake Agmon during its first three years (1994–1996). Water quality in Agmon was within general expectations for a shallow lake situated on peat. The first year of Agmon was characterized by the heavy influence of stream and drainage inflows with high pH, alkalinity, turbidity and electrical conductivity and high concentrations of sulfate and total dissolved solids. By the third year, however, many “in lake” processes (e.g., nutrient cycling and algal and macrophytic production) were well-developed and thus strongly affected lake water quality. Excessive phosphorus and nitrogen concentrations in the lake have led to hypertrophy, characterized by low dissolved oxygen concentrations and prolific blooms of nuisance algae. The management of this new ecosystem in the near future will require persistent, and innovative measures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008484506420
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  • 9
    Electronic Resource
    Electronic Resource
    Charakterisierung niederer primärer Amine durch IR-Spektren der 2,4-Dinitrophenylderivate (1968)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 239 (1968), S. 27-28 
    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/BF00518153
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  • 10
    Electronic Resource
    Electronic Resource
    Actinomycin D and the central granules in the nuclear pore complex: Thin sectioning versus negative staining (1972)
    Springer
    Cell & tissue research 127 (1972), S. 230-239 
    Details
    ISSN: 1432-0878
    Keywords: Nuclear pores ; Nucleocytoplasmic exchange ; Actinomycin D ; Tetrahymena ; Amphibian oocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Thin section electron microscopy of Actinomycin D treated Tetrahymena cells and amphibian oocytes (Xenopus laevis, Triturus alpestris) reveal no reduction in the central granules in the nuclear pore complexes. Possible reasons for the diversity between these results and earlier observations using negatively stained isolated nuclear envelopes from the same objects are discussed. The results clearly show that the presence of central granules within the nuclear pores does neither depend on nuclear RNA synthesis nor does indicate nucleocytoplasmic RNA transport. This conclusion leads to a reconsideration of the nature of the central granule. The functioning of the central granule of the nuclear pore complexes is further discussed in connection with recent studies on the ultrastructure of various types of cisternal pores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306805
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