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  • 1
    Electronic Resource
    Electronic Resource
    Enhancement of intrinsic photoluminescence due to lateral confinement in InP/InGaAs quantum wires and dots (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3789-3791 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-temperature photoluminescence and photoluminescence excitation experiments have been performed on lattice-matched InGaAs/InP quantum wells, wires, and dots grown by metalorganic vapor-phase epitaxy and processed by electron-beam lithography. An enhancement of the intrinsic photoluminescence mechanism is found with decreasing dimensionality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346307
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  • 2
    Electronic Resource
    Electronic Resource
    Visible Y-junction diode laser with mixed coupling (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 868-870 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental study and theoretical analysis of a phase-locked, visible, λ=670 nm, 2-3 Y-junction semiconductor laser array are presented. In a ridgetype 2-3 Y-junction, AlInGaP/InGaP array, both in-phase and anti-phase array modes are observed to lase simultaneously. The experimental results are discussed in the framework of a model based on the beam propagation method. The influence of the presence of both interferometric and evanescent coupling on the array modes is analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346772
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  • 3
    Electronic Resource
    Electronic Resource
    Observation of laser emission in an InP-AlInAs type II superlattice (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 3087-3089 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the observation of laser emission at low temperature from an optically pumped InP-AlInAs superlattice grown by metalorganic chemical vapor deposition. Independent measurements of low level photoluminescence excitation and optical absorption show that laser emission occurs between spatially separated conduction and valence levels localized, respectively, in InP and AlInAs, with a calculated wave function overlap as low as 0.04. High radiative efficiency observed in this system is believed to be a genuine consequence of the type II band lineup.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106760
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  • 4
    Electronic Resource
    Electronic Resource
    Presence of renin, angiotensinogen, angiotensin II in the lamb anterior pituitary gland: immunocytochemical study after cryoultramicrotomy (1991)
    Springer
    Histochemistry and cell biology 95 (1991), S. 561-566 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The presence of renin, angiotensin I-converting enzyme and angiotensin II detected by immunocytochemistry in the adult male rat anterior pituitary has suggested the existence of a pituitary renin-angiotensin system. To establish another mammalian experimental model we have investigated the presence of renin, angiotensinogen, angiotensin I-converting enzyme, and angiotensin II in five normal lamb anterior pituitaries by immunocytochemistry after cryoultramicrotomy. Renin, angiotensinogen and angiotensin II immunoreactivities were observed only in cytoplasmic granules of lactotrophs, and the three proteins were found co-localized with prolactin in the same granules by double immunolabelling. No immunoreactive angiotensin I-converting enzyme was observed. These results suggest an activation of renin in the cytoplasmic granules of lactotrophs leading to a local synthesis of angiotensin II. Thus, the lamb anterior pituitary may provide a good experimental model for investigating the possible autocrine action of a local renin-angiotensin system on prolactin release in the human pituitary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266742
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  • 5
    Electronic Resource
    Electronic Resource
    Voluntary suppression of defecation delays gastric emptying (1993)
    Springer
    Digestive diseases and sciences 38 (1993), S. 832-836 
    Details
    ISSN: 1573-2568
    Keywords: colon ; constipation ; gastric emptying ; outet obstruction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We wished to test the hypothesis that colonic loading with fecal material leads to delayed gastric emptying. Twelve healthy male volunteers were studied. Each of these subjects went through two randomized study periods of four days. In one of these, the subjects defecated upon urge, in the other period defecation was voluntarily suppressed. Gastric emptying of a semisolid meal (mashed potatoes) was measured with the noninvasive applied potential tomography technique. On day 3 no significant changes in gastric emptying were found, but on day 4 the emptying rate had decreased from 85.8±11.0%/hr (mean±sem) to 70.3±10.9%/hr (P〈0.05) and the T50 had increased from 38.5±3.4 min to 46.2±4.0 min (P〈0.025). The duration of the lag phase (4.1±1.5 min) was not significantly altered by suppression of defecation. Our conclusion is that voluntary suppression of defecation delays gastric emptying in normal subjects. This “cologastric brake” may be involved in the pathogenesis of upper abdominal symptoms in constipated patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01295908
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  • 6
    Electronic Resource
    Electronic Resource
    Ambulatory esophageal pressure and pH monitoring in patients with high-grade reflux esophagitis (1994)
    Springer
    Digestive diseases and sciences 39 (1994), S. 2084-2089 
    Details
    ISSN: 1573-2568
    Keywords: high-grade reflux esophagitis ; 24-hour ambulatory monitoring ; esophageal motility ; pathogenesis reflux esophagitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Using conventional manometry and 24-hr ambulatory pressure and pH monitoring, we investigated esophageal motility and the esophageal motor response to reflux in 11 patients with reflux esophagitis Savary-Miller grade III and IV, and an age- and sex-matched group of 11 healthy controls. The patients had a significantly increased esophageal acid exposure. Conventional manometry showed a significantly decreased LES pressure and distal peristaltic amplitude in patients. The 24-hr monitoring yielded a significant decrease in peristaltic contraction duration and peristaltic propagation velocity in the patient group. Distal peristaltic amplitude was not decreased. Analysis of the contractions occurring in the 2-min period after each reflux episode showed a reduced number of contractions during the upright period, caused by a significantly decreased number of peristaltic contractions. During the supine period, there was a trend towards an increased number of contractions. It is concluded that esophageal motor activity and the response to reflux are impaired in patients with high-grade reflux esophagitis. However, the abnormalities found are only minor and are unlikely to play an important role in the pathogenesis of reflux esophagitis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02090354
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  • 7
    Electronic Resource
    Electronic Resource
    Combined 24-hour recording of esophageal pH and pressure (1991)
    Springer
    Digestive diseases and sciences 36 (1991), S. 98S 
    Details
    ISSN: 1573-2568
    Keywords: esophagus ; pH ; pressure ; 24-hr recording
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Twenty-four-hour ambulatory recording of esophageal pH and pressure is a newly developed technique that has the potential of proving that a patient's noncardiac chest pain is of esophageal origin (esophageal reflux or motor abnormality). Until now four groups described their experiences with application of the technique in the work-up of noncardiac chest pain. It is now clear that the diagnostic yield of the technique in this syndrome is rather limited, especially when the incidence of pain episodes is low. Reflux appears to be a more common cause of chest pain than esophageal motor disorders. Complete quantitative analysis of the 24-hr motility data by hand is very time-consuming, so that automated, computerized data analysis is a prerequisite for more widespread clinical use of the technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01300604
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