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  • 1
    Electronic Resource
    Electronic Resource
    Nuclear magnetic spin-lattice relaxation of water protons caused by metal cage compounds (1992)
    s.l. : American Chemical Society
    Bioconjugate chemistry 3 (1992), S. 27-31 
    Details
    ISSN: 1520-4812
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bc00013a004
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  • 2
    Electronic Resource
    Electronic Resource
    Performance of the elliptically polarizing undulator on SPEAR : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1862-1864 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This is a description of the first tests of the elliptically polarizing undulator (EPU) on the SPEAR storage ring at SSRL. The EPU is the first device of its type; it is capable of producing vertically and horizontally plane-polarized light, and right and left circularly polarized light in the 500–1000 eV range. Tests of the EPU were done to characterize its effect on the electron beam in SPEAR. Even at minimum gap, motion of the EPU magnets to vary the polarization of the output radiation caused negligible changes in the tune or the steering of the electron beam, even with no compensation of the steering trim coils. Also measured was the polarization of x rays generated by the EPU using a newly developed multilayer polarimeter built to be efficient in the EPU's energy range. The EPU produces nearly 100% plane and circularly polarized x rays. Using left and right circularly polarized radiation, tests of magnetic circular dichroism on magnetic multilayers were also performed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145807
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  • 3
    Electronic Resource
    Electronic Resource
    Ion sources for heavy ion fusion (invited) : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1098-1101 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The development of ion sources for heavy ion fusion will be reported with particular emphasis on a recently built 2 MV injector. The new injector is based on an electrostatic quadrupole configuration, and has produced pulsed K+ ions of 950 mA peak from a 6.7 in. curved alumino silicate source. The ion beam has reached 2.3 MV with an energy flatness of ±0.2% over 1 μs. The measured normalized edge emittance of less than 1 π mm mrad is close to the source temperature limit. The design, construction, performance, and comparisons with three-dimensional particle-in-cell simulations will be described. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146767
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  • 4
    Electronic Resource
    Electronic Resource
    An elliptically-polarizing undulator with phase adjustable energy and polarization
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 347 (1994), S. 77-82 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0168-9002(94)91858-9
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  • 5
    Electronic Resource
    Electronic Resource
    Potential Remediation of 137Cs and90 Sr Contaminated Soil by Accumulation in Alamo Switchgrass (1998)
    Springer
    Water, air & soil pollution 104 (1998), S. 339-352 
    Details
    ISSN: 1573-2932
    Keywords: phytoremediation ; radionuclides ; switchgrass ; 137Cs ; 90Sr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Cesium-137 (137Cs) and Strontium-90 (90Sr) are radionuclides characteristic of nuclear fallout from nuclear weapons testing and nuclear reactor accidents. Alamo switchgrass (Panicum virginatum L.) is a perennial C4 species native to central North America that produces exceptionally high biomass yields in short periods of time. In three separate experiments, Alamo switchgrass plants were tested for their ability to accumulate 137 Cs and90 Sr from a contaminated growth medium. Plants in experiment 1 were grown in 33 × 20 × 7 cm plastic pans containing 2.5 kg sand. Plants in experiments 2 and 3 were grown in 30 × 3 cm diameter test tubes containing 0.3 kg growth medium. After 3 months of plant growth, either 102 Bq 137Cs or 73 Bq90 Sr g−1 soil were added to the growth medium. Plants in all three experiments were grown within a greenhouse that was maintained at 22 ± 2 °C with a photosynthetic active radiation of 400–700 µmol m−2 s−1 and a 14–16 h photoperiod. Above-ground plant biomass did not differ between plants that were not exposed to these radionuclides (controls) and those that were exposed to growth medium containing 137Cs or90 Sr over the course of the experiment. Plants accumulated 44 and 36% of the total amount of 90Sr and137 Cs added to growth medium after the first 5 harvests. After the first two harvests, the concentration of 137Cs and90 Sr in plant tissue and the amount of 137Cs or90 Sr removed from growth medium declined with each successive harvest. Duration of exposure correlated curvilinearly with accumulation of both 90Sr and 137Cs by plants (r2 = 0.95 and 0.78, respectively). As concentration of both 137Cs and 90Sr in growth medium increased, plant accumulation of both radionuclides increased and correlated curvilinearly in seedlings (r2 = 0.83 and 0.89 respectively).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004994123880
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  • 6
    Electronic Resource
    Electronic Resource
    Phytoremediation of soil contaminated with low concentrations of radionuclides (1996)
    Springer
    Water, air & soil pollution 88 (1996), S. 167-176 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Ecosystems throughout the world have been contaminated with radionuclides by above-ground nuclear testing, nuclear reactor accidents and nuclear power generation. Radioisotopes characteristic of nuclear fission, such as 137Cs and 90Sr, that are released into the environment can become more concentrated as they move up the food chain often becoming human health hazards. Natural environmental processes will redistribute long lived radionuclides that are released into the environment among soil, plants and wildlife. Numerous studies have shown that 137 Cs and 90Sr are not removed from the top 0.4 meters of soil even under high rainfall, and migration rate from the top few centimeters of soil is slow. The top 0.4 meters of the soil is where plant roots actively accumulate elements. Since plants are known to take up and accumulate 137 Cs and 90Sr removal of these radionuclides from contaminated soils by plants could provide a reliable and economical method of remediation. One approach is to use fast growing plants inoculated with mycorrhizal fungi combined with soil organic amendments to maximize the plant accumulation and removal of radionuclides from contaminated soils, followed by harvest of above-ground portion of the plants. High temperature combustion would be used to oxidize plant material concentrating 137 Cs and 90Sr, in ash for disposal. When areas of land have been contaminated with radionuclides are large, using energy intensive engineering solutions to remediate huge volumes of soil is not feasible or economical. Plants are proposed as a viable and cost effective method to remove radionuclides from the soils that have been contaminated by nuclear testing and nuclear reactor accidents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157420
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  • 7
    Electronic Resource
    Electronic Resource
    An effective method to extract DNA from environmental samples for polymerase chain reaction amplification and DNA fingerprint analysis (1994)
    Springer
    Current microbiology 29 (1994), S. 301-307 
    Details
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A rapid direct-extraction method was used to obtain DNA from environmental soil samples. Heat, enzymes, and guanidine isothiocyanate were utilized to lyse cells. The DNA was purified by agarose gel electrophoresis, amplified with 16S rRNA-based primers by use of the polymerase chain reaction, and then digested with the restriction endonucleasePalI. The extraction method was used to obtain DNA from a variety of plants, bacteria, and fungi includingGossypium hirsucum (cotton),Pseudomonas, Bacillus, Streptomyces, andColletotrichum. Up to 100 μg DNA/g (wet weight) of soil and 400 μg DNA/g of plant material were recovered. Restriction endonuclease analysis patterns of amplified rDNA from pure microbial cultures and plant species contained three to five different DNA fragments. Amplified rDNA of mixed population DNA extracts from soil samples, digested with the restriction endonucleasePalI, contained 12–20 DNA fragments, appearing as sample “fingerprints.” Results from eight environmental soil samples that were analyzed suggest that the amplified rDNA fingerprints can be used to help characterize the genetic and biological diversity of the microbial populations in these samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01577445
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  • 8
    Electronic Resource
    Electronic Resource
    Fingerprinting of Mixed Bacterial Strains and BIOLOG Gram-Negative (GN) Substrate Communities by Enterobacterial Repetitive Intergenic Consensus Sequence-PCR (ERIC-PCR) (1999)
    Springer
    Current microbiology 38 (1999), S. 217-223 
    Details
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. PCR-based genomic fingerprinting by use of enterobacterial repetitive intergenic consensus primers (ERIC-PCR) was evaluated for its use in fingerprinting DNA of mixed Gram-negative bacterial strains and BIOLOG Gram-negative (GN) microplate substrate communities. ERIC-PCR fingerprints of six different pure bacterial strains and a combined mixture of the strains were compared with fingerprints obtained by two more established methods: amplified ribosomal DNA restriction analysis (ARDRA) and random amplified polymorphic DNA analysis (RAPD-PCR). The ERIC-PCR fingerprint of the mixed strains was highly reproducible and was more species-specific and representative of the individual strain fingerprints than the ARDRA and RAPD-PCR fingerprints, respectively. ERIC-PCR fingerprinting of model and rhizosphere BIOLOG GN substrate communities also provided clearly distinguishable fingerprints. Results of this study suggest that ERIC-PCR represents a rapid and highly discriminating method for fingerprinting DNA of mixed Gram-negative bacterial strains and BIOLOG GN substrate communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00006790
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