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  • 1
    Digitale Medien
    Digitale Medien
    Modification of metal/GaN contacts with GaAs interlayers (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6539-6541 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have investigated feasibility of GaAs interlayers for the metal/GaN interface with synchrotron-radiation photoelectron spectroscopy. We have found that the use of piranha/HCl solutions is effective as a surface cleaning technique for GaN. We have confirmed that (111) GaAs grows epitaxially on a (0001) GaN substrate. Pd/GaAs/GaN sandwich structures have been successfully fabricated with molecular beam epitaxy. We have confirmed the GaAs interlayer modifies the band diagram at the metal/GaN interface. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.370158
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  • 2
    Digitale Medien
    Digitale Medien
    Characterization of carrier-trapping phenomena in ultrathin chemical oxides using x-ray photoelectron spectroscopy time-dependent measurements (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2011-2013 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report a technique to characterize carrier-trapping phenomena in SiO2 by measuring the Si 2p core-level energy of Si substrates covered with thin SiO2 layers as a function of x-ray irradiation time. It is found that the Si 2p peak energy, which corresponds to the band bending at the SiO2/Si interface, changes as the x-ray irradiation time increases. We attribute this to carrier-trapping phenomena in SiO2. By using this technique, it is found that the carrier-trapping phenomena differ remarkably among several chemical oxides. We also discuss the atomic structure of the traps that cause the trapping phenomena. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.123730
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  • 3
    Digitale Medien
    Digitale Medien
    Synthetic surfactants for protecting cultured fish against toxic phytoplankton (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 29 (1998), S. 0 
    Details
    ISSN: 1365-2109
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Polyoxyethylene alkyl esters, which are surface-active agents, were chemically synthesized from fatty acids (C12-C18) on reaction with different moles of polyethylene oxides, and were tested for effectiveness against the toxic raphidophytes Chattonella marina (Subrahmanyan) Hara & Chihara and C. antiqua (Hada) Ono. The synthetic surfactants destroyed cultured cells from these two species. Although the synthetic surfactants also exhibited ichthyotoxicity, this was lowered by increasing the molarity of ethylene oxide (EO) in alkyl ester molecules. Young yellowtail, Seriola quinqueradiata Temminck & Schlegel, survived exposure to C. marina (5000-5500 cells mLT−1) or C. antiqua (3000-3500 cells mL−1) cultures with the addition of 4-5 p.p.m. oleyl ester EO 14, but died within an hour without the addition of this surfactant.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2109.1998.00239.x
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  • 4
    Digitale Medien
    Digitale Medien
    Identification of T-cell epitope sequences on an important mite antigen (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 27 (1997), S. 0 
    Details
    ISSN: 1365-2222
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background T-cell epitopes on Der 1 and Der 2 groups, the major mite allergens, have been intensively analysed, while those on the other important allergens remain to be elucidated. We have cloned four cDNAs coding for important mite allergens on the basis of frequency and capacity of IgE binding. Stimulatory action of glutathione S-transferase-fused Mag1 on lymphocytes from mite-allergic patients was relatively high among them.Objective To identify T-cell epitopes on Mag1, we studied the stimulating activity of truncated Mag1 proteins and synthetic peptides on proliferative response of lymphocytes from mite antigen-immunized mice and mite-sensitive patients.Methods Truncated Mag1 proteins were expressed as a fusion protein with β-galactosidase in Escherichia coli pop2136 carrying a variety of deleted Mag1 inserts. Murine T-cell epitope regions were estimated by the truncated antigen-induced lymphocyte proliferation assay. Overlapping peptides covering the whole sequence of the presumed T-cell epitope regions were synthesized to identify the epitope core. sequences using murine and human Mag1-specific T-cell lines.Results Amino acid range 56–70 on Mag1 molecule showed remarkable stimulatory action on murine T cells, while amino acid ranges 51–65 and 86–100 had potent stimulatory activity on human T cells.Conclusion These results suggest that Mag1 is a valuable antigen suitable for studies on T-cell responses and T-cell epitopes in mice and humans.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2222.1997.tb01261.x
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  • 5
    Digitale Medien
    Digitale Medien
    ADENYLATE CYCLASE AND CYCLIC 3′,5′-NUCLEOTIDE PHOSPHODIESTERASE ACTIVITIES IN MUSCLES FROM STRESS-SUSCEPTIBLE AND CONTROL PIGS (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 42 (1977), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Recent results from our laboratory indicate that muscles obtained at 3 min postmortem from stress susceptible (SS) pigs have slightly higher levels of cyclic AMP (c-AMP) than muscles from control (C) pigs. Since c-AMP affects glycogenolysis and an abnormality of this process is a characteristic of SS pigs, this research was conducted to determine whether the elevation in c-AMP level is due to an increase in the rate of synthesis or to a decrease in the rate of c-AMP degradation. Specific activities of adenylate cyclase, the synthetic enzyme, were 146 f 62 (SD) for SS and 168 ± 46 pmoles/min/mg protein for-C; this difference was not significant (P = 0.05). Specific activities of cyclic 3′,5′-nucleo-tide phosphodiesterase, the degradative enzyme, were 403 ± 58 for SS and 415 ± 66 pmoles/min/mg protein for C; this difference was not significant (P = 0.05).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1977.tb01231.x
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  • 6
    Digitale Medien
    Digitale Medien
    RELATIONSHIP OF CYCLIC-AMP AND PHOSPHORYLASE a IN STRESS-SUSCEPTIBLE AND CONTROL PIGS (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 42 (1977), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Muscles from stress-susceptible (SS) pigs are often characterized by a rapid rate of glycogenolysis, but the mechanism which is responsible for this abnormality is unknown. As part of an effort to define the mechanism, we determined the relationship between cyclic AMP (c-AMP) and phosphorylase a activity in SS and control (C) pigs. Longissimus muscles were obtained from SS and C uias at 3. 30. 60 and 120 min postexsanguination. At 3 mm, c-AMP levels were 1555 ? 94 and 1309 ± 29 pica moles/g muscle from SS and C, respectively, and differed significantly (P = 0.05). Levels at ofher times were not significantly different. Ratios of phosphorylase a to a±b (total) activities at 3 min were 0.303 ± 0.047 and 0.157 ± 0.028 for SS and C, respectively, and differed significantly (P = 0.05). Differences were not significant after 3 min. Total activities at 3 min were 0.617 ± 0.119 and 0.535 ± 0.047 mg phosphorus liberated/10 min/mg protein. These results, without accounting for ofher mechanisms which might regulate phosphorylase activation, indicate that higher c-AMP levels at 3 min could produce higher phosphorylase a levels in SS than in C pigs. Whether this difference is adequate to explain the difference in rate of glycogenolysis needs further clarification.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1977.tb01230.x
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  • 7
    Digitale Medien
    Digitale Medien
    PALATABILITY AND VISUAL ACCEPTANCE OF DARK, NORMAL AND PALE COLORED PORCINE M. LONGISSIMUS (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 41 (1976), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Pork loins from carcasses weighing 68–75 kg were compared for quality characteristics. A total of 120 loins, with equal numbers of pale and watery, normal and dark colored loins, were evaluated. Pale chops had a significantly higher cooking loss than normal or dark colored chops. The consumer panel scored the pale chops significantly lower in organoleptic acceptability than normal or dark chops. The trained panel gave a similar rating for the organoleptic evaluation. When the consumer panel selected pork chops from a retail display case, the normal colored chops received the highest rating and the pale, watery chops the lowest. The pale chops were the most unstable and developed a greenish-gray cast after 2–3 days' storage. The normal colored chops had significantly more intramuscular fat and less protein than either pale or dark chops.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1976.tb00685.x
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  • 8
    Digitale Medien
    Digitale Medien
    Response of human gingival fibroblasts to prostaglandins (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 30 (1995), S. 0 
    Details
    ISSN: 1600-0765
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The effects of various prostaglandins (PGs) on the functions of human gingival fibroblasts (Gin-1 cells; ATCC CRL 1292) were examined by phase-contrast microscopy, cell-counting and radioautographic experiments. Tested PGs were PGA1, PGA2, PGB1, PGB2, PGD2, PGE1, PGE2, PGF1α, PGF2α, PGI2, 6-keto-PGF1α, 9α-11α-methanoepoxy-PGF2α, and thromboxane (TX) B2. PGA1, and PGD2 at 30 μM caused morphological deformation of Gin-1 cells. All the PGs tested at 30 μM suppressed the proliferation of Gin-1 cells in the logarithmic growth phase. Furthermore, all the PGs tested at 10 μM suppressed DNA synthesis, collagen synthesis, and noncollagenous protein synthesis in confluent Gin-1 cells, while exerting no effect on GAG synthesis. The concentrations of PGs used are beyond those found in healthy gingiva. However, in periodontitis the local concentrations of some PGs within the gingiva are expected to be extremely elevated beyond the physiological level. These results suggest that PGs may play an important role as a negative regulator in metabolism and some pathologic gingival conditions by suppressing the functions of gingival fibroblasts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0765.1995.tb01280.x
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  • 9
    Digitale Medien
    Digitale Medien
    CYCLIC AMP IN LONGISSIMUS MUSCLE FROM CONTROL AND STRESS SUSCEPTIBLE PIGS (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 41 (1976), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: As part of a continuing study to define the etiology of porcine stress syndrome and pale, soft, exudative pork, cyclic AMP (c-AMP) levels in longissimus muscle from stress susceptible (SS) and control (C) pigs were compared. At 3 min postmortem, levels of c-AMP were significantly higher for SS than for C pigs; thereafter differences were not significant. Variations in initial levels of glycogen affected lactate, pH and color of the postmortem muscles but did not affect c-AMP levels. Initial levels of glycogen were higher for SS pigs killed in the morning than for those killed in the afternoon. Results of this study indicate that further study, using greater numbers of pigs, is warranted to establish whether the 3 min postmortem level of c-AMP can be used as an objective measure of stress susceptibility.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1976.tb01113.x
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  • 10
    Digitale Medien
    Digitale Medien
    CHEMICAL COMPOSITION OF CHOPS FROM PALE, SOFT, EXUDATIVE (PSE) AND NORMAL PORK LOINS (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Chops from normal or pale, soft and exudative (PSE) pork loins were displayed under simulated retail conditions, and drip was collected. During display, drip from chops was greater for PSE than normal loins, but the drip from both types of chops contained similar concentration of protein, free amino acids, total amino acids, sodium, potassium, calcium and magnesium. However, loss per kg lean was higher in the PSE chops for protein (P 〈 0.01) and potassium, calcium and magnesium (P 〈 0.05). The lean tissue from PSE chops contained more protein but less ether extract and energy than did lean from normal chops. Differences between PSE and normal chops were not significant for dry matter, ash, sodium, potassium, calcium, magnesium, phosphorus, iron, copper, zinc, free amino acids or total amino acids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb08474.x
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