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  • 1
    Electronic Resource
    Electronic Resource
    Dependence of membrane potential on Ca^2^+ transport in cultured cytotrophoblasts of human immature placentas
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 685 (1982), S. 162-168 
    Details
    ISSN: 0005-2736
    Keywords: (Human cytotrophoblast culture) ; Ca^2^+ channel ; Ca^2^+ transport ; K^+ channel ; Membrane potential ; Placenta
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(82)90093-1
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  • 2
    Electronic Resource
    Electronic Resource
    Depolarization induced by injection of cyclic nucleotides into frog taste cell
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 904 (1987), S. 187-190 
    Details
    ISSN: 0005-2736
    Keywords: (Frog taste cell) ; Depolarization ; Membrane potential ; cyclic AMP ; cyclic GMP
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(87)90367-1
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  • 3
    Electronic Resource
    Electronic Resource
    Synchronous oscillation of the cytoplasmic Ca^2^+ concentration and membrane potential in cultured epithelial cells (Intestine 407)
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Molecular Cell Research 887 (1986), S. 105-112 
    Details
    ISSN: 0167-4889
    Keywords: (Epithelial 407 cell) ; Calcium store ; Concentration oscillation ; Membrane potential ; intracellular Ca^2^+
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-4889(86)90129-1
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  • 4
    Electronic Resource
    Electronic Resource
    Cross section of supercooled238UF6 in multiphoton absorption induced by 16 micrometer Raman-laser radiation (1994)
    Springer
    Applied physics 59 (1994), S. 475-477 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of multiphoton absorption of 16 µm Raman-laser radiation in supercooled238UF6 at 90 K were performed by using a pulsed Laval nozzle with an optical path length of 50 cm. The laser fluence was varied between 50 and 500 mJ/cm2 for four frequencies in the range from 625 to 629 cm−1. The energy absorbed by238UF6 molecules was investigated as a function of laser frequency or fluence, and highly accurate results were obtained with the use of the nozzle whose optical path length is much greater than that of nozzles used before. The results indicated that the absorption cross section at the peak absorption frequency (627.8cm−1) was proportional to the −1/3 power of the fluence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081071
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  • 5
    Electronic Resource
    Electronic Resource
    Measurements of235U/238U isotopic ratio in the photoproduct UF5 by multiphoton ionization and time-of-flight mass spectrometry (1996)
    Springer
    Applied physics 62 (1996), S. 515-519 
    Details
    ISSN: 1432-0649
    Keywords: 07.75 ; 33.00 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A MultiPhoton-Ionization Time-Of-Flight Mass Spectrometry (MPI/TOFMS) apparatus was developed for real-time measurement of the uranium isotopic ratio in nascent UF5 formed by the 266 nm photolysis of effusive UF6 ( 〈 300 K, ≈ 1.3 × 10−4 Pa). The UF5 was selectively and efficiently multiphoton ionized by 532 nm radiation at appreciably low fluences ( 〈 10 J/cm2). The main ions observed, U+ and U2+, were subsequently analyzed with a TOFMS with mass resolution of 1190 to separate235U n+ and238U n+ completely. The isotopic ratio measurements showed good precision resulting from the excellent agreement which was observed between the isotopic ratios in UF5 products and those in a parent UF6 sample. These results suggested that the MPI/TOFMS method can be applied to the real-time analysis of separation factors in the molecular laser isotope separation of uranium by ionization of UF5 following the infrared photodissociation of UF6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081053
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  • 6
    Electronic Resource
    Electronic Resource
    Vibrational predissociation of UF6 clusters in supersonic Laval nozzle flow (1996)
    Springer
    Applied physics 63 (1996), S. 57-61 
    Details
    ISSN: 1432-0649
    Keywords: 33.00 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The time-dependent change in the concentration of UF6 monomers populated in the ground state was monitored in a supersonic Laval nozzle flow with an infrared diode-laser spectrometer in which the frequency of the laser beam was fixed at theυ = 1 ← 0 transition (627.7 cm−1) of theν 3 vibrational mode of the238UF6 monomer. The concentration of UF6 monomers in the ground state increased immediately after a single shot from a Raman laser tuned to a vibrational mode of UF6 clusters (614.8 cm−1) was applied to the gas in the nozzle. Subsequently, this concentration leveled off and slowly returned to the previous level. These results indicate that the population of UF6 monomers in the ground state increased as a result of the predissociation of UF6 clusters vibrationally excited with Raman laser radiation. It is demonstrated that one can utilize this procedure for vibrational predissociation of UF6 clusters as a technique to increase the concentration of UF6 monomers in an irradiation zone for molecular laser isotope separation of uranium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01112839
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  • 7
    Electronic Resource
    Electronic Resource
    Contrast ratio and separation factor in multiphoton dissociation of supercooled UF6 irradiated with multifrequency 16 μm Raman-laser radiation (1996)
    Springer
    Applied physics 62 (1996), S. 77-81 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In infrared multiphoton dissociation of supercooled UF6 irradiated with multifrequency para-H2 Raman laser beams, separation factors and contrast ratios were measured by selective multiphoton ionization of the photoproduct UF5 at 532 nm followed by time-of-flight mass spectrometric analysis. The relationship between separation factor and contrast ratio is discussed theoretically and quantitatively investigated in the experiments. From this relationship, we obtain the irradiation conditions of the laser-beam fluences for attaining a high separation factor and estimate the value of the intrinsic separation factor in multifrequency dissociation of UF6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081251
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  • 8
    Electronic Resource
    Electronic Resource
    Accommodative properties of fast and slow pyramidal tract cells and their modification by different levels of their membrane potential (1968)
    Springer
    Experimental brain research 5 (1968), S. 189-201 
    Details
    ISSN: 1432-1106
    Keywords: Accommodation ; PT cell ; Membrane potential ; Fast-slow cell groups
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. Threshold-latency curves were determined by intracellular application of linearly rising currents to cat pyramidal tract (PT) cells under various conditions of impalement. The nature of the curves was found to vary considerably, depending mainly upon the resting potential level. Three different types of curves were distinguished: (1) the ceiling type at relatively high resting potentials, (2) the simple type at moderate levels and (3) the minimal gradient type under depolarized conditions. In the first type, the ceiling increased with increasing membrane potential level. The second type attained an extremely low ceiling. 2. After eliminating the effects of the resting potential, a significant difference was still found between the ceilings of fast and slow PT cells, the ceilings being higher in the former than in the latter. 3. Parameters determining the threshold-latency curve were analyzed by applying current steps intracellularly, as described in previous paper. The variations of the ceiling due to the resting potential level were found to be dominated by the first exponential component of the membrane, while those between fast and slow cells were ascribable to the second exponential component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238663
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  • 9
    Electronic Resource
    Electronic Resource
    Corticofugal influences on transmission to the dorsal spinocerebellar tract from hindlimb primary afferents (1967)
    Springer
    Experimental brain research 3 (1967), S. 135-149 
    Details
    ISSN: 1432-1106
    Keywords: DSCT ; Corticospinal ; Inhibition ; Excitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Effects from the cerebral cortex on neurones of the dorsal spinocerebellar tract (DSCT) were examined: I. In group I units (units receiving monosynaptic excitation from group I fibres) repetitive stimulation of the contralateral sensorimotor cortex usually inhibited impulse transmission from the primary afferents. The inhibition had a latency of 10–20 msec and lasted for 82-100 msec or more. Discharges induced by muscle stretch were also inhibited by the cortical stimulation. DSCT units belonging to extensors and flexors were both inhibited from the cortex. In a small percentage of group I units the inhibition was preceded by a shorter-lasting excitation. 2. FRA units (units receiving excitation from cutaneous and/or high threshold muscle afferents) were typically excited by the cortical stimulation. The excitation was often followed by a period of depression of transmission from the periphery. 3. It is suggested from the effective cortical area and experiments with lesions in the medullary pyramid and in the spinal cord that the inhibition in group I units and the excitation of FRA units are both mediated by the corticospinal tract. Experiments were also made to determine the level where the cell body of a given DSCT unit is located, and the results from 56 units are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233258
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  • 10
    Electronic Resource
    Electronic Resource
    Cortically evoked pre-and postsynaptic inhibition of impulse transmission to the dorsal spinocerebellar tract (1967)
    Springer
    Experimental brain research 3 (1967), S. 163-177 
    Details
    ISSN: 1432-1106
    Keywords: DSCT ; Postsynaptic inhibition ; Presynaptic inhibition ; Corticospinal ; Primary afferents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Synaptic actions evoked from primary afferents and the sensorimotor cortex in neurones of the dorsal spinocerebellar tract were investigated: 1. Stimulation of the anterior lobe of the cerebellum produced a small IPSP in only one but not in the other six neurones examined. 2. IPSPs were induced not only from group I fibres (in 41% of group I neurones) but also from cutaneous and/or high threshold muscle afferents (in 37%). 3. Stimulation of the contralateral sensorimotor cortex evoked IPSPs in 80% of group I neurones. The IPSP had a latency of 10–15 msec and lasted for 40–100 msec. EPSPs were evoked from the cortex in a small number of neurones. 4. Effects from the cortex were compared with those from primary afferents in individual neurones. The cortical IPSPs were induced independently of whether the neurone received monosynaptic EPSP from extensor or flexor group I fibres. The cortical IPSPs (or EPSPs) occurred more frequently in neurones which exhibited polysynaptic IPSPs (or EPSPs) from primary afferents. 5. The few FRA neurones encountered were all excited from the cortex. Excitability measurements of primary afferent terminals in or near Clarke's column showed that a terminal depolarization is evoked from the cortex in group Ib but not in Ia afferents. The relative importance of post-and presynaptic inhibition of transmission to the DSCT is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233260
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