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  • 1
    Electronic Resource
    Electronic Resource
    Fully integrated probe for proton nuclear magnetic resonance magnetometry (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 2764-2768 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this article, we present the first fully integrated nuclear magnetic resonance probe ever realized. Planar spiral coils, a radio-frequency preamplifier, a mixer, and an audio-frequency amplifier are integrated using a standard complementary metal–oxide–semiconductor technology on a single silicon chip of 10 mm2. A 1 mm3 solid sample of cis-polyisoprene, placed over one of the integrated coils, is used as resonating material. The realized integrated probe allows measurements of static magnetic fields from 0.7 to 7 T with a magnetic-field resolution better than 1 ppm/Hz1/2, an absolute accuracy better than 3 ppm, and a spatial resolution of about 1 mm. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1374599
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  • 2
    Electronic Resource
    Electronic Resource
    Quantized current jumps in silicon photoconductors at room temperature (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 3787-3791 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the observation of quantized jumps due to single-carrier trapping and detrapping at defect states in silicon photoconductors of 103 μm3 in volume. A specifically designed electrical test structure in a low-doped (2×1014 cm−3) silicon crystal was fabricated. It consists in four substrate resistances connected in a Wheatstone bridge. After the exposure to light, the bridge offset voltage recovers its equilibrium value with steps of 5–10 μV, corresponding to the emission or capture of a single carrier. Such structures also display random telegraph signals in the dark, with steps of similar amplitude. This behavior is observed with structures processed on Czochralski-grown substrates and not with those processed on float-zone substrates. Simple calculations based on quantized free carrier concentration variations corroborate the above measurements. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371288
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  • 3
    Electronic Resource
    Electronic Resource
    High accuracy magnetic field measurements with a Hall probe (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2703-2707 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A silicon-based temperature stabilized axial Hall probe with an absolute accuracy of ±40 ppm in the full range between 0 and 6 T is presented. The absolute calibration of the probe is performed against a nuclear magnetic resonance (NMR) probe. The application of the probe to a magnetic field profile of a 5 T superconducting magnet system, with field gradients as high as 30 T/m, reaching an overall accuracy of better than ±100 ppm, is demonstrated. In addition to the high absolute accuracy, this Hall probe allows high spatial resolution measurements of inhomogeneous fields in configurations where present NMR probes are not usable. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149831
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  • 4
    Electronic Resource
    Electronic Resource
    High-accuracy oxygen polarograph for photosynthetic systems (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 486-491 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new system is presented here, whose design is based on the electrochemical phenomena occurring on the platinum electrode that we examined before [P. Meunier and R. Popovic (unpublished)]. The architecture of the system is articulated around an IBM-PC computer which controls the polarization of the electrodes, the triggering of the flash lamp, and the acquisition of data. The potentiostat circuit and new electrode design improve the response of the electrode to a rise time of 4 ms and a decay time constant of 21 ms, without the signal being distorted by filters and without using the first derivative of the signal. This polarograph shows a 50-dB signal-to-noise ratio (0.3% error) during experiments with the motile algae Dunaliella tertiolecta. The determination of amplitudes of oxygen production is performed with third-order cubic spline interpolations, after subtraction of the current base line. The resulting accuracy and reproducibility will enable researchers to attain a higher degree of refinement in the quantification of properties of the oxygen evolving complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139867
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  • 5
    Electronic Resource
    Electronic Resource
    Automatic integrating fluorometer using an Apple-II and Scope-85 (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 934-936 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The system presented here measures the fluorescence of plant samples in in vivo and in vitro automatically, calculating the principal photosynthetic parameters of the sample (evaluation of the F0 level of fluorescence, normalization of the fluorescence curve, rate of light trapped at the PSII complex, maximum quantum yield of photochemistry, average fluorescence induction time, and evaluation of the number of PSII reaction centers) as well as measuring heat dissipation kinetics. Because this system offers higher speed, more versatility, and greater accuracy (3%) than manual methods, it is a unique and valuable tool for laboratories involved in fluorescence research in the photosynthesis field. To demonstrate the use of this system and its superior performance, this article describes classic experiments carried out with the alga Dunaliella tertiolecta.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139753
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  • 6
    Electronic Resource
    Electronic Resource
    Quasipersistent change in Hall sensitivity after illumination (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3610-3611 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A quasipersistent change in the magnetic sensitivity of nonplate-like Hall sensors after light exposure has been discovered. The recovery time constant is about 10 min. The observed effect is very similar to the persistent photoconductivity (PPC) which has been described some time ago in silicon bulk material. Surprisingly, the new effect is about 1 order of magnitude stronger than the PPC. The similar recovery behavior of both effects suggests a common origin in precipitated oxygen clusters in the active zone. The amplitude of the variations is highly dependent on the cluster concentration in the substrate. The presented Hall sensors give a sensitive means to characterize the oxygen-denuded zone in Czochralski wafers. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1329162
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  • 7
    Electronic Resource
    Electronic Resource
    Protective role of CaCl"2 against Pb^2^+ inhibition in photosystem II
    Amsterdam : Elsevier
    FEBS Letters 271 (1990), S. 181-184 
    Details
    ISSN: 0014-5793
    Keywords: Calcium chloride ; Electron transport ; Extrinsic polypeptide ; Lead inhibition ; Oxygen evolution ; Photosystem II ; Variable fluorescence
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(90)80401-4
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  • 8
    Electronic Resource
    Electronic Resource
    Relationship between the redox-state of P-700 and photosystem I-mediated proton translocation studied with chloroplasts from dark-grown Pinus nigra seedlings
    Amsterdam : Elsevier
    FEBS Letters 81 (1977), S. 65-68 
    Details
    ISSN: 0014-5793
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(77)80929-0
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  • 9
    Electronic Resource
    Electronic Resource
    Mercury inhibition at the donor side of photosystem II is reversed by chloride
    Amsterdam : Elsevier
    FEBS Letters 321 (1993), S. 19-23 
    Details
    ISSN: 0014-5793
    Keywords: Calcium ; Chloride ; Electron transport ; Mercury ; Oxygen evolution ; Photosystem II
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(93)80612-X
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  • 10
    Electronic Resource
    Electronic Resource
    Oxygen-quenched chlorophyll a fluorescence and electron transport in barley during greening (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 62 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Seedlings of barley (Hordeum vulgare L. cv. Conquest) were dark-grown for 7 days and then transferred to light. The time courses of chlorophyll a fluorescence induction underwent changes during greening periods of from 3 to 48 h. Yields of variable fluorescence during greening correlated with electron transport capacity via photosystem II (PS II) except at the early stage from 3 to 6 h. The discrepancy may result from there being only a small amount of light harvesting complex associated with PSII for 3 to 6 h greening. Oxygen quenching effects were interpreted as indicating the development of the electron transport system and the organization of light harvesting complex associated with PSII. The most intensive O2 quenching of relative fluorescence is found during the early stage of greening when the ratio of the primary quinone electron acceptor (Q) to chlorophyll is high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb04584.x
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