• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 530
  • 444
  • 103
  • 67
  • 58
  • 37
  • 14
  • 13
  • 10
  • 5
  • 5
  • 4
  • 4
  • 4
  • 4
  • Tagged with
  • 1473
  • 681
  • 420
  • 255
  • 218
  • 190
  • 185
  • 185
  • 176
  • 142
  • 138
  • 127
  • 121
  • 118
  • 113
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Modeling and simulation of non linear electrophoresis

Shim, Jaesool, January 2007 (has links) (PDF)
Thesis (Ph. D.)--Washington State University, December 2007. / Includes bibliographical references.
2

A comparative study of thre blood proteins of five species of Oncorhynchus using starch-gel electrophoresis

Jones, Helen January 1963 (has links)
The blood proteins of five species of Oncorhynchus: chum, coho, pink, sockeye and spring salmon, have been separated by starch-gel electrophoresis. Comparisons the protein fractions obtained from representatives of fresh water downstream migrants, maturing upstream migrants and mature adults, have yielded indications of intraspecific differences associated with physiological states. Interspecific comparisons of the protein fractions obtained from salmon in comparable physiological states have yielded further indications of blood protein differences associated with species differences. A taxonomic grouping of the five species has been suggested based on the constant characteristics of their respective protein patterns. The use of a standard protein has provided an efficient means of removing inter-gel variations In protein mobility. / Science, Faculty of / Zoology, Department of / Graduate
3

Procedures for sample clean-up and concentration in capillary zone electrophoresis for determination of drugs in biosamples

Pálmarsdóttir, Sveinbjörg. January 1996 (has links)
Thesis (doctoral)--University of Lund, 1996.
4

Procedures for sample clean-up and concentration in capillary zone electrophoresis for determination of drugs in biosamples

Pálmarsdóttir, Sveinbjörg. January 1996 (has links)
Thesis (doctoral)--University of Lund, 1996.
5

Electrophoretic behaviour of polystyrene microspheres in agarose gels

杜光旭, To, Kwong-yuk. January 1993 (has links)
published_or_final_version / Biochemistry / Doctoral / Doctor of Philosophy
6

A study of microgel particles in aqueous and non-aqueous media using light scattering techniques

Bradbrook, Stewart Mark January 1996 (has links)
No description available.
7

The development of capillary isotachophoresis for use with electrospray mass spectrometry

Eastwood, Catherine Rachel January 2000 (has links)
No description available.
8

Design, testing and optimization of a microfluidic device for capture and concentration of bacteria

Cherla, Srinivas 30 October 2006 (has links)
Effective detection of bacterial pathogens in large sample volumes is a challenging problem. Pre-concentration routines currently in practice before the actual detection process are cumbersome and hard to automate. An effort is made to address the problem of volume discrepancy between day-to-day samples and the concentrated samples needed for analysis. Principles of conceptual design are used in formulating the ‘Need Statement’, ‘Function Structure’ and in identifying the ‘Critical Design Parameters’ and ‘Design Constraints’. Electrokinetic phenomena are used to exploit the surface charges on bacteria. Electrophoresis is used to transport the bacteria to electrode surface and “Electrostatic trapping” is then used to capture these microbes on the electrode surface. The captured microbes can then be concentrated in a concentrator unit. A prototype microfluidic device is fabricated for showing the proof of concept. Optimization is done to minimize hydraulic power consumption and wetted volume. Observations from the initial prototype device along with the optimization results are used in building a new prototype device. Operation of this device is demonstrated by capture of bacteria from flow. Qualitative studies are conducted and preliminary quantification is also done.
9

Capillary electrophoresis in pure nonaqueous solvents

Salimi-Moosavi, Mir Mohammad Hossein 01 January 1997 (has links)
The use of nonaqueous solvents in capillary electrophoresis (CE) was investigated. Nonaqueous solvents used included methanol, ethanol, acetonitrile, dimethylformamide, and molten salts. Both indirect, and direct UV detection as well as electrochemical detection were examined. The behavior of electroosmotic flow and Joule heating was examined as well as selectivity patterns for a variety of inorganic and organic ionic species. Analytes examined included inorganic anions, alkali and alkaline earth metal ions, alkanesulfonates, alkyl sulfates, linear alkylbenzensulfonates, derivatized and free amino acids, and fatty acids. Selectivity was dependent not only on the nature of the solvent, but also on the nature and concentration of the electrolyte. With many inorganic ions completely reversed separation order relative to aqueous systems was observed. Although the addition of metal ions caused changes in resolution, complete separation of alkanesulfonates (C<sub>2</sub>-C<sub>16</sub>) and alkyl sulfates (C<sub>8</sub>-C<sub>18</sub>) was possible by a change from protic (methanol) to aprotic conditions (addition of acetonitrile). The partial separation of positional isomers of linear alkyl benzensulfonate homologues (C<sub>10</sub>-C<sub>15</sub>) was achieved in methanol/acetonitrile mixtures. The complete separation of alkali and alkaline earth metal ions, which has not been reported to date, and separation of potassium and ammonium were observed in a methanol/imidazole electrolyte. Significantly different migration order was achieved for dansylated amino acids compared to aqueous systems. Changes in selectivity of free amino acids were possible in basic and acidic electrolytes. Complete separation of a wide range of fatty acids (C<sub>1</sub>-C<sub>20</sub>) was possible in less than 20 min. The unique selectivity patterns in nonaqueous solvents was related to changes in solvation and ion-interaction effects. The ability to easily adjust selectivity via choice of electrolyte and to inject aqueous samples directly into the nonaqueous electrolytes suggests that such systems may offer significant advantages for many analytical problems. The results illustrate that when selectivity, efficiency, quantitation, and detection limits are taken into consideration, nonaqueous CE approaches should, in many situations, offer a unique alternative to aqueous based CE analyses. Electroosmotic flow was appreciable, and was cathodal in basic solutions. Reversal of electroosmotic flow was observed in the presence of an excess of a strong acid (HCl or HClO<sub>4</sub>) in the separation electrolyte. The nature of electrolyte anion (chloride, perchlorate, and acetate) and solvent (methanol/acetonitrile mixtures) had significant effects on the electroosmotic flow in acidic conditions. Evidence was observed for ion adsorption (protons and anions) on to silica surfaces and ion-interaction in the electrolyte. Adsorption and ion-interaction could be used to control both the direction and magnitude of electroosmotic flow. Reproducibility of electroosmotic flow was good under appropriate experimental conditions (%RSD = 1.1).
10

Design, testing and optimization of a microfluidic device for capture and concentration of bacteria

Cherla, Srinivas 30 October 2006 (has links)
Effective detection of bacterial pathogens in large sample volumes is a challenging problem. Pre-concentration routines currently in practice before the actual detection process are cumbersome and hard to automate. An effort is made to address the problem of volume discrepancy between day-to-day samples and the concentrated samples needed for analysis. Principles of conceptual design are used in formulating the ‘Need Statement’, ‘Function Structure’ and in identifying the ‘Critical Design Parameters’ and ‘Design Constraints’. Electrokinetic phenomena are used to exploit the surface charges on bacteria. Electrophoresis is used to transport the bacteria to electrode surface and “Electrostatic trapping” is then used to capture these microbes on the electrode surface. The captured microbes can then be concentrated in a concentrator unit. A prototype microfluidic device is fabricated for showing the proof of concept. Optimization is done to minimize hydraulic power consumption and wetted volume. Observations from the initial prototype device along with the optimization results are used in building a new prototype device. Operation of this device is demonstrated by capture of bacteria from flow. Qualitative studies are conducted and preliminary quantification is also done.

Page generated in 0.0739 seconds