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Adjustable levels of strong turbulence in a positive/negative ion plasma (1993)

Sheehan, D. P. ; McWilliams, R. ; Rynn, N.

New York, NY : American Institute of Physics (AIP)

Physics of Fluids 5 (1993), S. 1523-1528

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Positive/negative ion plasmas, composed of Ba+, SF6−, and residual electrons, were observed to display characteristics of strong turbulence. Experiments on the UCI Q machine linked the presence of negative ions (and the depletion of electrons) with large density fluctuations (δn/n(approximately-equal-to)1), large-amplitude, low-frequency electrostatic noise (f≤20 kHz), and rapid transport of ions across magnetic field lines (D⊥(approximately-equal-to)104 cm2/sec). Ion velocity distributions were heated parallel to and cooled perpendicular to the confining magnetic field. The partial pressure of gaseous SF6 was shown to serve as a regulator of plasma turbulence. Turbulence levels could be smoothly varied from quiescent states (δn/n(approximately-equal-to)0.01) to strongly turbulent states (δn/n(approximately-equal-to)1).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.860892

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Digitale Medien

Device for dispersal of micrometer- and submicrometer-sized particles in vacuum (1990)

Sheehan, D. P. ; Carillo, M. ; Heidbrink, W.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 61 (1990), S. 3871-3875

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A simple, versatile device for dispersing micrometer- and submicrometer-sized particles in vacuum is described. The source allows control of particle size (0.5 μm≤l≤200 μm) and particle flux density up to roughly 107 cm−2 s−1. Several types of microparticles were successfully dispersed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1141515

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Digitale Medien

Simple overdense rf plasma source (1990)

McWilliams, R. ; Edrich, D. ; Platt, R. C. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 61 (1990), S. 3460-3463

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: A simple, gas-fed, radio-frequency-driven plasma source is described. By use of lower hybrid waves, noble gas plasmas were produced with electron densities up to 1012 cm−3 over a range of magnetic fields from 400 G to 1.5 kG and rf frequencies from 2–220 MHz.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1141603

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Detection of estrogen receptor (ER) in the rat brain using rat anti-ER monoclonal IgG with the unlabeled antibody method (1991)

Henry, W. W. ; Medlock, K. L. ; Sheehan, D. M. ; [weitere]

Springer

Histochemistry and cell biology 96 (1991), S. 157-162

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ISSN: 1432-119X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Summary Application of Sternberger's unlabeled antibody enzyme method for detection of the estrogen receptor (ER) using a rat primary antibody with rat tissues has been discouraged, presumably because nonspecific staining of endogenous IgG was expected with the required anti-rat IgG bridging antibody. Because the blood-brain barrier greatly reduces immunoglobulin infiltration into the brain, we hypothesized that rat brain tissue could be specifically immunostained using rat IgG primary antibodies. A rat monoclonal anti-ER antibody (H222) specifically stained ERs in the brains of ovariectomized but not in ovariectomized estrogen-treated rats. In contrast, the uterus, a well-perfused target organ stained intensely in a nonspecific fashion. Dense populations of estrogen receptors were observed in the medial preoptic area, the bed nucleus of the stria terminalis, and the arcuate and ventromedial nuclei of the hypothalamus. A monoclonal rat IgG directed against alpha-tubulin labeled primarily cortical dendrites quite distinct from the neuronal nuclei that are the primary antigenic sites for the estrogen receptor antibody. These results confirm that the sensitive unlabeled antibody method can be applied to rat brain tissues, even when the primary antibody is rat IgG and that labeling of endogenous IgG may be used as a simple method to evaluate the integrity of the blood brain barrier.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00315987

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