ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Determination of phase transition pressures of ZnTe under quasihydrostatic conditions (1993)
    Springer
    Pure and applied geophysics 141 (1993), S. 643-652 
    Details
    ISSN: 1420-9136
    Keywords: High pressure ; pressure calibration ; ZnTe ; synchrotron X-ray source ; DIA type cubic anvil apparatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Pressure behavior of ZnTe at room temperature was studied using an X-ray energy dispersive method on a DIA type cubic anvil apparatus (SAM-85) at NSLS-X17B1. By using powdered polyethylene, the sample and NaCl for a pressure scale were held under quasihydrostatic conditions, which were confirmed by X-ray diffraction method. Two high-pressure phase transitions were confirmed using X-ray powder diffraction simultaneously with electrical resistance measurements. The phase transition pressures under quasihydrostatic conditions were determined to be 9.6 GPa, at which the resistance increased, and 12.0 GPa, which was the midpoint of a large resistance decrease. Errors in the pressure determinations were estimated to be less than 0.2 GPa. These pressure values may depend on grain size and anisotropic stress effects on the calibrant. From X-ray observation of ZnTe, the bulk modulus of the zinc blende structure was calculated to beK 0=51(3) GPa andK 0 ′ =3.6(0.8), and the first transition at 9.6 GPa was found to have about 9% volume change. It was consistent with an anomaly in the pressure generating curves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00998350
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    (ϖμ/ϖT) P of the lower mantle (1996)
    Springer
    Pure and applied geophysics 146 (1996), S. 533-549 
    Details
    ISSN: 1420-9136
    Keywords: Lower mantle ; seismic tomography ; thermoelasticiti ; composition models ; geodynamics ; shear modulus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We estimate (ϖμ/ϖT) P of the lower mantle at seismic frequencies using two distinct approaches by combining ambient laboratory measurements on lower mantle minerals with seismic data. In the first approach, an upper bound is estimated for |(ϖμ/ϖT) P | by comparing the shear modulus (μ) profile of PREM with laboratory room-temperature data of μ extrapolated to high pressures. The second approach employs a seismic tomography constraint (ϖ lnV S /ϖ lnV P ) P =1.8–2, which directly relates (ϖμ/ϖT) P with (ϖK S /ϖT) P . An average (ϖK S /ϖT) P can be obtained by comparing the well-established room-temperature compression data for lower mantle minerals with theK S profile of PREM along several possible adiabats. Both (ϖK S /ϖT) and (ϖμ/ϖT) depend on silicon content [or (Mg+Fe)/Sil of the model. For various compositions, the two approaches predict rather distinct (ϖμ/ϖT) P vs. (ϖK S /ϖT) P curves, which intersect at a composition similar to pyrolite with (ϖμ/ϖT) P =−0.02 to −0.035 and (ϖK S /ϖT) P =−0.015 to −0.020 GPa/K. The pure perovskite model, on the other hand, yields grossly inconsistent results using the two approaches. We conclude that both vertical and lateral variations in seismic velocities are consistent with variation due to pressure, temperature, and phase transformations of a uniform composition. Additional physical properties of a pyrolite lower mantle are further predicted. Lateral temperature variations are predicted to be about 100–250 K, and the ratio of (ϖ lnp/ϖ lnV S ) P around 0.13 and 0.26. All of these parameters increase slightly with depth if the ratio of (ϖ lnV S /ϖ lnV P ) P remains constant throughout the lower mantle. These predicted values are in excellent agreement with geodynamic analyses, in which the ratios (ϖ ln ϱ/ϖ lnV S ) P and (ϖ ϱ/ϖ lnV S ) P are free parameters arbitrarily adjusted to fit the tomography and geoid data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874732
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Pre-Chill Spray of Chicken Carcasses to Reduce Salmonella typhimurium (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 62 (1997), 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 test chamber was designed and constructed and prechill chicken carcasses inoculated with Salmonella typhimurium were treated in it. They were sprayed with tap water, 0.85% sodium chloride (NaCl), 5% or 10% trisodium phosphate (TSP), 5% or 10% sodium bisulfate (SBS), 0.1% cetylpyridinium chloride (CPC), or 1% lactic acids (LAC) at 207, 345 or 827 kPa pressure for either 30 or 90 sec exposure time. Samples were taken from carcass wash water to determine the most probable number of Salmonella. Compared to tap water spraying, 0.85% NaCl spraying did not significantly reduce Salmonella. The greatest reductions of S. typhimurium, by 10% TSP, 10% SBS, 0.1% CPC or 1% LAC spraying, were 3.7, 2.4, 1.6 or 1.6 log in 90 sec treatments, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1997.tb04441.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Chemical Spray Conditions for Reducing Bacteria on Chicken Skins (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 63 (1998), 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: Chemical spray parameters, including temperature, pressure and exposure time, were evaluated for their effects on reducing Salmonella typhimurium on chicken skins. Pre-chilled chicken carcass skins were inoculated with S. typhimurium and sprayed with 0.1% cetylpyridinium chloride (CPC), 10% trisodium phosphate (TSP), or 2% lactic acid (LA). In the CPC spray, the 40°C treatments resulted in the greatest bacterial reduction. The most effective spray temperatures for LA and TSP treatments were 40 to 55°C. All chemical spray treatments at 207–1034 kPa reduced S. typhimurium. The reduction of S. typhimurium was greatest in all treatments when sprayed with 90 sec spray and 90 sec setting time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1998.tb15816.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Salmonella typhimurium Attached to Chicken Skin Reduced Using Electrical Stimulation and Inorganic Salts (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 59 (1994), 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: Chicken skins inoculated with Salmonella typhimurium at 1 × 108 CFU/mL were subjected to chemical or electrical treatments (4 mA/ cm2 current, 1 kHz frequency and 50% duty cycle) for 10 min in 1% sodium chloride (NaCl), sodium carbonate (Na2CO3), or trisodium phosphate (Na3PO4 12H2O or TSP). Salmonellae on chicken skins and in treatment solutions and rinsing water were enumerated with microbiological platings. Chicken skin was also examined using scanning electron microscopy.S. typhimurium attached to skins were reduced by 90% after electrical treatments in 1% NaCl, Na2CO3, or TSP, while the reduction ranged from 34% to 76% in groups treated by the salts alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1994.tb06888.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    A MEMBRANE SEPARATOR/BIOREACTOR COUPLED WITH ABSORBANCE MEASUREMENT FOR DETECTION OF Escherichia coli O157:H7 (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of rapid methods and automation in microbiology 9 (2001), S. 0 
    Details
    ISSN: 1745-4581
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A membrane separator/bioreactor system was developed for rapid detection of Escherichia coli O157:H7. The system consisted of a membrane separator/bioreactor (0.45 μm of the pore size) to separate the-complexes of E. coli O157:H7 and alkaline phosphatase-conjugated anti-E. coli O157:H7 antibodies from the sample and to produce p-nitrophenol through the enzymatic reaction (p-nitrophenyl phosphate hydrolysis), and an optical detector for measuring the p-nitrophenol absorbance at 400 nm. The membrane material and the flow rate of the substrate for the enzymatic hydrolysis had great effects on the absorbance of p-nitrophenol. The optimum conditions for the enzymatic reaction were determined as 1.0 M Tris buffer, pH 8.0, and 0.1 M MgCl2 for this system. The detection range was 104± 107 CFU/mL with a relative standard deviation of 4.3 ± 14.2%, and whole procedure could be completed in 50 min without any enrichment and culture. Other bacteria such as Salmonella typhimurium, Campylobacter jejuni and Listeria monocytogenes had no significant interference with the detection of E. coli O157:H7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4581.2001.tb00232.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    DETECTION OF VIABLE LISTERIA MONOCYTOGENES IN MILK USING AN ELECTROCHEMICAL METHOD (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of rapid methods and automation in microbiology 11 (2003), S. 0 
    Details
    ISSN: 1745-4581
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract  Growth of Listeria monocytogenes in a Listeria enrichment broth (LEB) was automatically monitored by electrochemical cyclic voltammetric scan using a gold working electrode. Changes in cyclic voltammograms were observed during growth of L. monocytogenes in LEB. The reduction peak at −0.4 V (vs Ag/AgCl) corresponding to the reduction of oxygen dissolved in LEB on cyclic voltammograms was decreasing with proliferation of L. monocytogenes, and disappeared eventually. A pair of reversible redox peaks appeared during growth of L. monocytogenes in LEB. These cyclic voltammetric characteristics can be used to detect L. monocytogenes in various samples. Threshold values (detection time) obtained from the oxygen consumption curves were inversely related to the concentrations of L. monocytogenes in the broth. A calibration curve was obtained by plotting initial cell concentrations (CFU/mL) determined by conventional plate counting, as a function of the detection time. A linear response was found on the calibration curve for L. monocytogenes between 1 ∼ 9 times 100 and 1 ∼ 9 times 105 cells/mL. The detection time was approximately 17 and 6 h for 1 ∼ 9 times 100 and 1 ∼ 9 × 105 cells/mL of viable L. monocytogenes in the broth, respectively. The method was evaluated in detection of L. monocytogenes in milk samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4581.2003.tb00404.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    PCR-BASED FLUORESCENT METHOD FOR RAPID DETECTION OF SALMONELLA TYPHIMURIUM IN POULTRY SAMPLES (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of rapid methods and automation in microbiology 10 (2002), S. 0 
    Details
    ISSN: 1745-4581
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A DNA binding fluorescence method based on polymerase chain reaction (PCR) products was evaluated for rapid detection of Salmonella Typhimurium in poultry products. Wash water samples of chicken carcasses and ground turkey were inoculated with S. Typhimurium to obtain final concentrations of 10° - 105 CFU/mL. One mL of each sample was used to get the DNA template and 5 μL of the sample template was added into 25 μL of SYBR Green PCR Master Mix and two specific Salmonella ompC gene primers. The negative control was the same except 5 μL of each wash solution was added instead of 5 μL sample template. The reaction was carried out in a thermocycler. Finally, the fluorescence signal of each PCR product was measured using a fluorometer. The PCR products were also confirmed by ethidium bromide agarose gel, and the DNA concentrations of the PCR products were measured by a filter fluorescence photometer. The results showed that when bacterial cells increased from 0 to 2 CFU/mL, the fluorescence signal increased significantly. The PCR-based fluorescence method could detect the target bacteria in minutes after PCR amplification compared to hours by gel electrophoresis and also could be done at an earlier time during PCR amplification. The detection limit of this method for S. Typhimurium in the poultry samples was 2 CFU/mL without any enrichment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4581.2002.tb00014.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    A CHEMILUMINESCENCE BIOSENSOR COUPLED WITH IMMUNOMAGNETIC SEPARATION FOR RAPID DETECTION OF SALMONELLA TYPHIMURIUM (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of rapid methods and automation in microbiology 11 (2003), S. 0 
    Details
    ISSN: 1745-4581
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A chemiluminescence biosensor, using a fiber-optic-linked photometer and a data acquisition unit connected to a PC, was developed in conjunction with immunomagnetic separation for rapid detection of Salmonella Typhimurium. Magnetic microbeads coated with Anti-Salmonella antibodies and anti-Salmonella antibodies conjugated with horseradish peroxidase (HRP) were added to artificially-inoculated samples, and the immuno-reaction was completed in 60 min resulting in a sandwich complex. A magnetic field was applied to collect magnetic beads and the addition of luminol to HRP-conjugated antibodies resulted in a chemiluminescence reaction. The signal was collected through a fiber optic light guide, measured with a photometer, and recorded in the data acquisition unit. The minimum detection limit of the chemiluminescence biosensor for S. Typhimurium was 1.97 × 103 CFU/mL and the range of the detectable signal was from 8.6 to 350 mV for cell numbers from 1.97 × 103 to 1.97 × 106 CFU/mL. Signal values for 106 CFU/mL of S. Typhimurium were at least 97 and 394% higher than the corresponding values for S. enteritidis and four times the signal values for others including S. montevideo, S. california, S. heidlberg, and S. seftenberg, respectively. The biosensor response showed a significant difference (P 〈 0.05) between 103 CFU/mL S. Typhimurium and 106 CFU/mL of commonly-occurring bacteria in foods including Listeria monocytogenes, Pseudomonas aeruginosa, Citrobacter freundii, Campylobacter jejuni, Escherichia coli O157, and generic Escherichia coli. A regression equation, V = 0.0262 N 5.7713, with R2= 0.9713 was obtained for the calibration curve over the detection range for S. Typhimurium. The whole procedure could be completed within 90 min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4581.2003.tb00034.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    RAPID DETECTION OF SALMONELLA TYPHIMURIUM IN FOOD SAMPLES USING A BIENZYME ELECTROCHEMICAL BIOSENSOR WITH FLOW INJECTION (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of rapid methods and automation in microbiology 9 (2001), S. 0 
    Details
    ISSN: 1745-4581
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A bienzyme (tyrosinase and horseradish peroxidase) electrochemical biosensor was developed for detection of Salmonella typhimurium, and evaluated for application in a flow injection system coupled with immunomagnetic separation for food samples. Parameters for immunomagnetic separation, enzymatic reaction, flow injection and electrochemical detection were determined using pure culture samples. The selectivity was tested in the presence of Listeria monocytogenes, Campylobacter jejuni and E. coli 0157:H7. The results showed a linear relationship for logarithmic values between peak current ratio and the cell number of S. typhimurium in the range of 103 105 cfu/mL, with R2= 0.99. The detection limit of this method was 1.09 × 103 cfu/mL for S. typhimurium and the detection time was 2.5 h. Samples of chicken carcass wash water and ground beef were used to evaluate the biosensor. The results demonstrated that this biosensor has a potential for rapid detection of different pathogens in various food samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4581.2001.tb00249.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...