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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of an in vitro model of human melanoma invasion based on reconstructed human skin (2000)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 142 (2000), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this study was to compare the invasive properties of normal human cutaneous melanocytes and of a cutaneous melanoma cell line (HBL) in a three-dimensional model of reconstructed human skin. Specifically, we asked to what extent the pigmentary and invasive behaviour of both cells is influenced by their interaction with adjacent skin cells (keratinocytes and fibroblasts) and the basement membrane (BM). In the presence of a BM, normal human melanocytes within this model remained within the basal layer of keratinocytes and did not pigment spontaneously. When the BM was removed, melanocytes were found suprabasally and pigmented extensively. No significant invasion of melanocytes into the dermis was detected in the presence or absence of the BM. HBL melanoma cells showed no significant ability to invade into the dermis in the absence of other cells, irrespective of the presence or absence of the BM. However, when added to keratinocytes and fibroblasts, HBL cells showed a capacity to invade into the dermis, both in the presence and absence of the BM. Associated with HBL invasion into the dermis, we noted significant keratinocyte entry into the dermis. On their own, keratinocytes entered the dermis in the absence of the BM but showed no significant penetration into the dermis when the BM was present. In summary, this model demonstrates clear differences between melanocytes and a melanoma cell line with respect to their invasive properties. It also allows demonstration of interactions between cells, and between cells and the BM. The study also provides evidence for a synergistic interaction between this melanoma cell line and keratinocytes in penetrating the BM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2133.2000.03287.x
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  • 2
    Electronic Resource
    Electronic Resource
    A multiple pin, flip-chip system for microwave and gigabit per second cryogenic device testing at variable temperatures (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1542-1547 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a cryogenic probe and cryostat system to test both active and passive superconducting devices and circuits up to microwave frequencies at variable temperatures. Our system consists of two basic parts: the cryostat and the matching probe. The cryostat is a unique, very efficient, variable temperature, flow-type cryostat, where we control temperature without electrical heaters. It is magnetically shielded and allows rapid testing between 4.2 K and room temperature. Probes developed for this cryostat have a larger number of shorter cables than standard dip-type probes. They are designed to test chips or chip assemblies without additional packaging. Chips or chip assemblies can be quickly mounted and dismounted from a fixed spring-contact assembly. Each probe has 56 wide-bandwidth signal cables. We have repeatedly used these probes for testing both active and passive superconducting integrated circuits up to 20 GHz. The probe and cryostat combination provides a testing capability that is simultaneously high frequency, dc magnetic shielded, has variable cryogenic temperature, and quick turnaround. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1337072
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  • 3
    Electronic Resource
    Electronic Resource
    Antioxidant and anti-inflammatory activities of melanocortin peptides (2004)
    Oxford, UK; Malden, USA : Blackwell Publishing Ltd/Inc
    Experimental dermatology 13 (2004), S. 0 
    Details
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: α-Melanocyte-stimulating hormone (α-MSH) has previously been identified as a potent anti-inflammatory agent in various tissues including the skin. It operates by binding to the melanocortin-1 receptor (MC-1R) which results in the elevation of cyclic AMP. α-MSH opposes the action of several proinflammatory cytokines including tumour necrosis factor-α (TNF-α). We have shown that α-MSH can inhibit TNF-α-stimulated activation of nuclear factor-κB (NF-κB) in human cultured melanocytes, melanoma cells, keratinocytes, fibroblasts, Schwann cells and olfactory ensheathing cells. It also inhibits TNF-α-stimulated upregulation of intercellular adhesion molecule-1 (ICAM-1) in many of these cells and can inhibit peroxide-stimulated activation of glutathione peroxidase, suggesting an antioxidant role. α-MSH is also able to stimulate intracellular calcium release in keratinocytes and fibroblasts (which do not readily show detectible cyclic AMP elevation) but only in the presence of PIA (an adenosine agonist). The carboxyl terminal tripeptides KPV/KP-D-V are reported to be the minimal sequences necessary to convey anti-inflammatory potential, but evidence on how they act is not fully known. Stable transfection of Chinese hamster ovary cells with MC-1R suggests that the KPV peptides operate by this receptor, at least by elevating intracellular calcium. Elevation of cyclic AMP by these tripeptides has not been detected in any cell type studied; however, calcium elevation can inhibit TNF-α-stimulated NF-κB activity (as for cyclic AMP). In conclusion, the MSH peptides convey anti-inflammatory and antioxidant activity in many cell types in skin and nerve, by counteracting proinflammatory cytokine signalling. The KPV peptides appear to act functionally via the MC-1R and can also elevate intracellular calcium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0906-6705.2004.0212ak.x
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Sodium Acid Pyrophosphate in Combination with Sodium Nitrite or Sodium Nitrite/Potassium Sorbate on Clostridium botulinum Growth and Toxin Production in Beef/Pork Frankfurter Emulsions (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 48 (1983), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Combinations of sodium acid pyrophosphate (SAPP) with added sodium nitrite and/or potassium sorbate were tested at various pH levels to determine effectiveness in delaying Clostridium botulinum growth and toxin production in frankfurter emulsions. Formulations containing sodium nitrite (40 ppm), potassium sorbate (0.26%) and SAPP (0.4%) resulted in a greater delay of toxin production (12–18 days) than other combinations (6–12 days) having similar pH values. Treatments containing 0.4% SAPP appeared to be more inhibitory than their counterparts without SAPP, displaying less numbers of toxic samples during the 53-day storage period at 27°C. Aerobic mesophilic colony counts and residual nitrite data showed little difference among treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1983.tb14949.x
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Belly Composition on Sorbate-Cured Bacon (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 47 (1982), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A comparison was made between fat-type and lean-type bellies cured with either 40 ppm sodium nitrite/0.26% potassium sorbate or 120 ppm sodium nitrite. Residual nitrite levels were higher in fat bacon regardless of cure. Sorbate-cured bacon resulted in signiticantly higher TBA numbers than did regular-cure bacon. Nitrosopigment to total pigment ratio did not vary with cure, but did remain significantly higher in fat bacon and roughly paralleled residual nitrite levels. Analysis for nitrosamines indicated greater concentrations in fat bellies compared to lean. Nitrosamines were suppressed though not eliminated, by the sorbate cure in both fat and lean bellies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb11063.x
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  • 6
    Electronic Resource
    Electronic Resource
    Inhibition of Clostridium botulinum Growth from Spore Inocula in Media Containing Sodium Acid Pyrophosphate and Potassium Sorbate with or without added Sodium Chloride (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 49 (1984), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effects of sodium acid pyrophosphate (SAPP), sodium chloride (NaCl) and/or potassium sorbate (PS) on the growth from heat-activated spores of three individual strains or a mixture of ten strains of Clostridium botulinum in peptone-yeast extract-glucose broth at pH 5.55 or 5.85 were measured spectrophotometricalty at A630nm. Growth ratios (GR = treatment/control) based on time to reach A630= 0.35 or 0.04 were calculated and used to compare effects of additives on strains. SAPP, NaCl, PS, and pH exhibited independent significant main effects (p≦0.01) on delaying growth in most C. botulinum strains tested. Combinations of additives without NaCl consistently caused an increase in the GR and an increase in organism sensitivity to additives in the medium. Treatments containing SAPP (0.2 or 0.4%) and PS (0.13 or 0.26%) were more effective for delaying growth than other formulations tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1984.tb12850.x
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Packaging Film and Vacuum Level on Regular and Sorbate-Cured Bacon (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 47 (1982), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Bacon was produced with either 40 ppm NaNO2/0.26% potassium sorbate, or 120 ppm NaNO2. Slices were packaged in either nylon/Surlyn or nylon/Saran/Surlyn pouches and sealed at either a high or intermediate vacuum level. At 0, 10, 21 and 28 days after packaging, residual nitrite, rancidity, pH, residual salt and pigment conversion were measured. Residual nitrite and pH were lower while nitrosopigment conversion was higher in bacon packaged with the high-barrier film. Vacuum level, however, had no effect on any measured characteristic. The sorbate/reduced nitrite cure resulted in lower pigment conversion, lower residual nitrite, and a higher TBA number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb10080.x
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  • 8
    Electronic Resource
    Electronic Resource
    Heck reactions catalyzed by oxide-supported palladium – structure–activity relationships (2000)
    Springer
    Topics in catalysis 13 (2000), S. 319-326 
    Details
    ISSN: 1572-9028
    Keywords: Heck reaction ; formation of carbon–carbon bonds ; oxide-supported palladium ; Pd dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The catalytic activity and selectivity of palladium supported on various metal oxides in carbon–carbon coupling reactions of aryl bromides with styrene (Heck reaction) were investigated. The activity is determined by the nature of the oxide support and the Pd dispersion (structure–activity relationships). The relation of homogeneous (leaching) and heterogeneous mechanisms is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009022030636
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  • 9
    Electronic Resource
    Electronic Resource
    Altered hyperemic response of the coronary arterial bed in alloxan-diabetes (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 738-740 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Reactive hyperemic responses of the coronary arterial bed, provoked by asphyxia or clamping of the coronary artery, were compared in alloxan-diabetic and metabolically healthy dogs. In alloxan-diabetic dogs the response of the coronary arterial bed lasted longer, and its reactivity to hypoxia was lower. Treatment with adenosine caused less vasodilation in diabetic animals than in controls. These changes may be due to the altered reactivity of diabetic vascular smooth muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990301
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  • 10
    Electronic Resource
    Electronic Resource
    Effects on prostaglandins F2α, I2, and indomethacin on isolated coronary arteries from healthy and alloxandiabetic dogs (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 863-864 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Contractile responses of isolated coronary arteries from healthy and alloxan-diabetic dogs to prostaglandin F2α were enhanced by indomethacin and inhibited by prostaglandin I2. The potentiation by indomethacin was more prominent in diabetic vessels than in normal arteries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01985683
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