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  • 1
    Electronic Resource
    Electronic Resource
    Carrier recombination rate in GaAs-AlGaAs single quantum well lasers under high levels of excitation (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2083-2085 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The carrier recombination rate in GaAs-AlGaAs single quantum well layers is investigated using a small-signal technique for carrier densities from 1017 to 1019/cm3. For carrier densities up to mid 1018/cm3, the inverse of the differential carrier lifetime, 1/τd, increases linearly with the carrier density. The differential rate, however, saturates at higher carrier densities and remains nearly constant for carrier densities higher than 1019/cm3. The deviation from the bulk recombination behavior is due to a portion of the injected carriers populating the semicontinuum states where the rate for the radiative transition is much smaller. The experimental data indicate that the runaway increase of threshold current with decreasing cavity length commonly observed in the short-cavity lasers is mainly due to the loss of carrier confinement at high carrier densities rather than due to fast carrier-depleting processes, such as Auger recombination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102979
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  • 2
    Electronic Resource
    Electronic Resource
    GaN metal–semiconductor–metal photodetectors grown on lithium gallate substrates by molecular-beam epitaxy (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1372-1374 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The growth, fabrication, and characterization of ultraviolet metal–semiconductor–metal (MSM) GaN photodetectors grown on LiGaO2 by molecular-beam epitaxy are reported herein. GaN/LiGaO2 material with dislocation densities of approximately 108 cm−2 and x-ray diffraction (00.4) full width at half maximum of 75 arcsec results in MSMs showing high responsivity, 0.105 A/W, at a reverse bias voltage of 20 V at 308 nm, and low dark currents of 7.88 pA at a 60 V reverse bias. Given the etch selectivity of the GaN/LiGaO2 system and the excellent performance of these devices, GaN device integration onto alternative substrates appears promising. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1398320
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  • 3
    Electronic Resource
    Electronic Resource
    Infectious gastroenteritis caused by Vibrio harveyi (V. carchariae) in cultured red drum, Sciaenops ocellatus (2003)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 19 (2003), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary An outbreak of serious mortality among the cultured red drum Sciaenops ocellatus (L.) characterized by a swollen intestine containing transparent yellow fluid (ascites and gastroenteritis) occurred in July 2000 in Taiwan. A motile strain Rd 0700 was isolated from head kidney and/or the intestinal yellow fluid on tryptone soya agar (TSA) supplemented with 2% (w/v) NaCl and/or thiosulfate citrate bile salt (TCBS) sucrose agar plates. Applying biochemical characteristics, this strain was characterized and identified as Vibrio harveyi (V. carchariae). The bacteria could be re-isolated from kidney, liver, and the transparent yellow fluid of swollen intestine of fish after bacterial challenge. The LD50 values of the organism and its extracellular products (ECP) were 2.9×107 colony forming units (CFU) and 3.85 μg protein g−1 fish body weight, respectively. All moribund/dead fish exhibited gastroenteritis except those killed within 12 h. This is a first report showing that intraperitoneal (i.p.) injection of the ECP from V. carchariae is lethal to red drum and can reproduce gastroenteritis in the fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0426.2003.00356.x
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  • 4
    Electronic Resource
    Electronic Resource
    An Intelligent Business Advisor System for Stock Investment (1997)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Expert systems 14 (1997), S. 0 
    Details
    ISSN: 1468-0394
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Computer Science
    Notes: This paper presents an intelligent system to assist small investors to determine stock trend signals for investment in stock business. A pilot system is built providing three main categories of technical and analysis theories, namely momentum, moving average, and support/resistance line. It has extensive graphic interface design to facilitate the usage of the system. For novice investors, the system is associated with tutoring features and it supports analysis study of the rationale behind some system recommendations. Skilful investors can explore the various theories for the prediction by means of adjusting the weightings, combinations and even some independent variables allocated by the intelligent system. General users can therefore formulate their investment strategies upon system recommendations under different investment criteria accordingly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1468-0394.00049
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  • 5
    Electronic Resource
    Electronic Resource
    Susceptibility of salmonid erythrocytes to lysis by bacterial lipopolysaccharides (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 14 (1991), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Bacterial lipopolysaccharide (LPS) is known to have binding affinity for mammalian erythrocyte membranes but does not cause haemolysis. In this study, LPS from eight different bacterial species all possessed haemolytic activity for salmonid erythrocytes. There were some differences in haemolytic activity among the different bacterial LPS after 2 h incubation. Lytic titres continued to increase with time for some LPS species reaching extremely high litres after 20 h incubation for the Salmonella minnesota LPS. The LPS extracted by the hot-phenol method from extracellular products (ECP) of Aeromonas salmonicida was more haemolytic than that extracted from the bacterial cell walls. Separated lipid A- and O-antigen fractions of A. salmonicida LPS had a similar low haemolytic activity. When A. salmonicida LPS, lipid A- and O-antigen were pre-incubated with bovine serum albumin, only LPS extracted from ECP retained any haemolytic activity. The LPS types used in this study were not haemolytic for rabbit erythrocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1991.tb00598.x
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  • 6
    Electronic Resource
    Electronic Resource
    The role of the lethal extracellular cytolysin of Aeromonas salmonicida in the pathology of furunculosis (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 14 (1991), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. The histopathological effects of intramuscular (i.m.) and intraperitoneal injections of the purified lethal cytolytic toxin of A. salmonicida in Atlantic salmon, Salmo salar L., were restricted to extensive degranulation of eosinophilic granular cells (EGCs) in the gills (both routes) and a limited coagulative necrosis of muscle fibres at the site of i.m. injection. The severity of these lesions did not apparently differ amongst fish that were moribund within 48 h and the surviving fish at 90 h. Previous studies indicate a maximum time to death caused by this toxin of 48 h. Thus, it is difficult to account for death of the fish from the toxin solely on the grounds of the histopathological features. It is suggested that a complex metabolic dysfunction results in death. The mechanism of ‘furuncle’ formation was demonstrated to result from a combined effect of the cytolysin and the purified 70-kDa protease present in the ECP. When i.m.-injected singly, the purified cytolysin produced a limited coagulative necrosis and the purified protease produced a limited liquefaction and haemorrhaging. In combination, they induced the extensive liquefactive haemorrhagic ‘furuncle’ characteristic of the whole ECP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1991.tb00597.x
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  • 7
    Electronic Resource
    Electronic Resource
    Flavanone and other constituents from Onychium siliculosum
    Amsterdam : Elsevier
    Phytochemistry 20 (1981), S. 527-529 
    Details
    ISSN: 0031-9422
    Keywords: Onychium siliculosum ; Pteridaceae ; flavanones ; pterosins ; structure elucidation.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)84186-2
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  • 8
    Electronic Resource
    Electronic Resource
    The phospholipid composition of Atlantic salmon, Salmo solar L., erythrocyte membranes (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 35 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb02981.x
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  • 9
    Electronic Resource
    Electronic Resource
    The quantitative relationship of lethality between extracellular protease and extracellular haemolysin of Aeromonas salmonicida in Atlantic salmon (Salmo salar L.) (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 61 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract An additive relationship of lethality between purified protease and haemolysin of the extracellular products (ECP) of Aeromonas salmonicida was demonstrated by i.p. injection in Atlantic salmon (Salmo salar L.). The lethal toxicity of the combinations of protease and haemolysin follow a linear regression line y=−54.54x+ 2400. The LD50 of protease and haemolysin when injected separately was 2400 ng/g fish and 44 ng protein/g fish, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03565.x
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  • 10
    Electronic Resource
    Electronic Resource
    Mapping the surface regions of Pseudomonas aeruginosa PAK pilin: the importance of the C-terminal region for adherence to human buccal epithelial cells (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 3 (1989), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The adherence of non-mucoid Pseudomonas aeruginosa strains is believed to be mediated by the pilus, which consists of a single protein subunit of 15000 Oaltons called pilin. Ten antipeptide antisera were raised to map the surface regions of pilin from P. aeruginosa strain K (PAK). Only one of the antipeptide antisera to the eight predicted surface regions failed to react with PAK pili in direct ELISA. Five out of eight synthetic peptides representing the eight predicted surface regions reacted with anti-PAK pilus anti-serum, indicating their surface exposure. Combining the antipeptide and antipilus antisera results, all eight predicted surface regions were demonstrated to be surface-exposed. The PAK 128-144-OH peptide produced the best binding antiserum to PAK pili. Only antipeptide Fab fragments directed against the disulphide bridged C-terminal region of PAK piiin blocked the adherence of pili to human buccal epithelial cells, which suggests that this region contains the receptor-binding domain of the PAK pilus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1989.tb00135.x
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