Home About us Contact
|
Home About us Contact | ||
|
|
||
Selective Growth (selective + growth)
Selected AbstractsSelective growth of Staphylococcus aureus from flushed dairy manure wastewater using acriflavine-supplemented mannitol salt agarLETTERS IN APPLIED MICROBIOLOGY, Issue 6 2006J.A. Davis Abstract Aims:, To investigate the use of mannitol salt agar (MSA) supplemented with acriflavine for selective growth and quantification of Staphylococcus aureus from flushed dairy manure wastewater (FDMW). Methods and Results:, Minimal inhibitory concentrations of acriflavine in MSA were determined by comparing the growth of S. aureus subsp. aureus (ATCC 33591) and Staphylococcus epidermidis (ATCC 155) in pure culture. Acriflavine concentrations of 1·3, 1·4 and 1·5 mg l,1 reduced CFU of S. epidermidis by 43%, 55% and 87%, respectively, while CFU of S. aureus subsp. aureus were only reduced by 15%, 20% and 26% at the respective concentrations of acriflavine. MSA supplemented with 1·5 mg l,1 acriflavine was tested for selective growth of indigenous S. aureus from three grab samples of FDMW. Acriflavine concentrations of 1·5 mg l,1 reduced background flora without significantly reducing (P < 0·05) indigenous S. aureus counts. Conclusions:, Acriflavine-supplemented MSA provides an effective media for selective growth and quantification of indigenous S. aureus from FDMW in the presence of high levels of background microflora. Significance and Impact of the Study:,S. aureus is implicated for mastitis infections in dairy cows. Therefore, a reliable means for monitoring and detecting the organism in FDMW provides a tool for measuring the effectiveness of treatment for reducing S. aureus levels and implementing flushwater recycling without affecting herd health. [source] Selective growth of GaN nanocolumns by Al thin layer on substratePHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 6 2007Shunsuke Ishizawa Abstract For the application of GaN nanocolumns, one of the most important issues is to control their shapes and positions. We demonstrated a selective RF-MBE growth of GaN nanocolumns using patterned Al thin pre-deposited layers on a substrate via their nitridation. As the nanocolumns were grown at the edge of the nitrided Al patterns, a possibility of controlling the shape and the position of nanocolumns was suggested. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Platinum Surface Modification of SBA-15 by ,-Radiation Treatment,ADVANCED MATERIALS, Issue 6 2003T. Yamada Modification of the mesoporous surface of SBA-15 with platinum has been successfully carried out by means of ,-radiation treatment. This novel treatment allows the selective growth of platinum in the SBA-15 micropores (see Figure). This is in contrast to traditional temperature treatment, in which platinum particles or rods also grow in the mesopores. [source] Preparation of a Highly Conductive Al2O3/TiN Interlayer Nanocomposite through Selective Matrix Grain GrowthJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 3 2006Xihai Jin An electroconductive TiN/Al2O3 nanocomposite was prepared by a selective matrix grain growth method, using a powder mixture of submicrosized ,-Al2O3, nanosized ,-Al2O3, and TiN nanoparticles synthesized through an in situ nitridation process. During sintering, a self-concentration of TiN nanoparticles at the matrix grain boundary occurred, as a result of the selective growth of large ,-Al2O3 matrix grains. Under suitable sintering conditions, a typical interlayer nanostructure with a continuous nanosized TiN interlayer was formed along the Al2O3 matrix grain boundary, and the electroconducting behavior of the material was significantly improved. Twelve volume percent TiN/Al2O3 nanocomposite with such an interlayer nanostructure showed an unprecedentedly low resistivity of 8 × 10,3,·cm, which was more than two orders lower than the TiN/Al2O3 nanocomposite without such an interlayer nanostructure. [source] Selective growth of Staphylococcus aureus from flushed dairy manure wastewater using acriflavine-supplemented mannitol salt agarLETTERS IN APPLIED MICROBIOLOGY, Issue 6 2006J.A. Davis Abstract Aims:, To investigate the use of mannitol salt agar (MSA) supplemented with acriflavine for selective growth and quantification of Staphylococcus aureus from flushed dairy manure wastewater (FDMW). Methods and Results:, Minimal inhibitory concentrations of acriflavine in MSA were determined by comparing the growth of S. aureus subsp. aureus (ATCC 33591) and Staphylococcus epidermidis (ATCC 155) in pure culture. Acriflavine concentrations of 1·3, 1·4 and 1·5 mg l,1 reduced CFU of S. epidermidis by 43%, 55% and 87%, respectively, while CFU of S. aureus subsp. aureus were only reduced by 15%, 20% and 26% at the respective concentrations of acriflavine. MSA supplemented with 1·5 mg l,1 acriflavine was tested for selective growth of indigenous S. aureus from three grab samples of FDMW. Acriflavine concentrations of 1·5 mg l,1 reduced background flora without significantly reducing (P < 0·05) indigenous S. aureus counts. Conclusions:, Acriflavine-supplemented MSA provides an effective media for selective growth and quantification of indigenous S. aureus from FDMW in the presence of high levels of background microflora. Significance and Impact of the Study:,S. aureus is implicated for mastitis infections in dairy cows. Therefore, a reliable means for monitoring and detecting the organism in FDMW provides a tool for measuring the effectiveness of treatment for reducing S. aureus levels and implementing flushwater recycling without affecting herd health. [source] Thermal precipitation of self-organized PbTe quantum dots in CdTe host matrixPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 9 2008K. Koike Abstract This paper describes a selective growth of PbTe/CdTe quantum wells (QWs) and quantum dots (QDs) in CdTe host matrix by molecular beam epitaxy. These two tellurides possess almost identical lattice constants, but differ fundamentally in their lattice structure. Owing to a strong phase separation by the lattice-type mismatch, insertion of a PbTe thin layer in CdTe matrix at higher temperatures than 280 °C was resulted in a self-organized growth of coherent and three-dimensionally isotropic QDs. The same growth procedure at lower temperatures, on the other hand, yielded a conventional QW structure with sharp heterointerface. This QW structure, however, was found to precipitate well-ordered QD-array by a postgrowth annealing, indicating that the QD formation is induced by the minimization of interface energy between the inmiscible two tellurides. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Cytogenetic analysis of trophoblasts by comparative genomic hybridization in embryo-fetal development anomaliesPRENATAL DIAGNOSIS, Issue 8 2001A. C. Tabet Abstract Cytogenetic studies of spontaneous abortions or intrauterine fetal death depend on conventional tissue culturing and karyotyping. This technique has limitations such as culture failure and selective growth of maternal cells. Fluorescent in situ hybridization (FISH) using specific probes permits diagnosis of aneuploidies but is limited to one or a few chromosomal regions. Comparative genomic hybridization (CGH) provides an overview of chromosomal gains and losses in a single hybridization directly from DNA samples. In a prospective study, we analyzed by CGH trophoblast cells from 21 fetuses in cases of spontaneous abortions, intrauterine fetal death or polymalformed syndrome. Six numerical chromosomal abnormalities including one trisomy 7, one trisomy 10, three trisomies 18, one trisomy 21 and one monosomy X have been correctly identified by CGH. One structural abnormality of the long arm of chromosome 1 has been characterized by CGH. One triploidy and two balanced pericentromeric inversions of chromosome 9 have not been identified by CGH. Sexual chromosomal constitutions were concordant by both classical cytogenetic technique and CGH. Contribution of trophoblast analysis by CGH in embryo-fetal development anomalies is discussed. Copyright © 2001 John Wiley & Sons, Ltd. [source] Very High Yield Growth of Vertically Aligned Single-Walled Carbon Nanotubes by Point-Arc Microwave Plasma CVD,CHEMICAL VAPOR DEPOSITION, Issue 3 2005F. Zhong A very high yield, selective growth of dense, vertically aligned single-walled carbon nanotubes (SWNTs) has been demonstrated for the first time on Si substrates with a sandwich-like coating structure of Al2O3/Fe/Al2O3 at a low (600,°C) temperature by point-arc microwave plasma CVD. The SWNT film thickness increases continuously with the growth time, suggesting an almost unlimited life time for the catalyst. A film thickness of 420,,m, and production yield of SWNTs to catalyst of about 770,000,% can be achieved within 2,h. [source] | ||||||||||||||||