Abstract

Near-field optical microscopy can provide a resolution greater than wavelength of light. In operation, light is passed down a tapered optical fiber and emerges at a fine tip whose diameter is smaller than the wavelength of light. This tip is brought into contact with a fluorescently labeled specimen and is scanned over the surface. Only a fluorophore in the immediate vicinity of the tip is maximally excited. However, there is a low level of excitation in the far field as the light disperses away from the tip. This low level background can be removed by confocal aperture in the imaging optics. We are exploring the alternative strategy of eliminating this background fluorescence by the use of multiple photon excitation. In this scheme, fluorophorr, excitation is proportional to the square or higher powers of the excitation illumination and therefore will essentially only occur in the immediate vicinity of the tip. We are proposing to investigate whether we can get sufficient levels of two-photon excitation in the vicinity of a subwavelength tip to enable images with a good signal to noise ratio to be obtained.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
3P41RR000570-28S1
Application #
6117272
Study Section
Project Start
1998-09-30
Project End
2000-06-30
Budget Start
1997-10-01
Budget End
1998-09-30
Support Year
28
Fiscal Year
1998
Total Cost
Indirect Cost

  Institution

Name
University of Wisconsin Madison
Department
Type
DUNS #
161202122
City
Madison
State
WI
Country
United States
Zip Code
53715

  Publications

Malecki, Marek; Putzer, Emily; Sabo, Chelsea et al. (2014) Directed cardiomyogenesis of autologous human induced pluripotent stem cells recruited to infarcted myocardium with bioengineered antibodies. Mol Cell Ther 2:
Malecki, Marek (2014) 'Above all, do no harm': safeguarding pluripotent stem cell therapy against iatrogenic tumorigenesis. Stem Cell Res Ther 5:73
Mavroudi, Maria; Zarogoulidis, Paul; Porpodis, Konstantinos et al. (2014) Stem cells' guided gene therapy of cancer: New frontier in personalized and targeted therapy. J Cancer Res Ther (Manch) 2:22-33
Malecki, Marek; LaVanne, Christine; Alhambra, Dominique et al. (2013) Safeguarding Stem Cell-Based Regenerative Therapy against Iatrogenic Cancerogenesis: Transgenic Expression of DNASE1, DNASE1L3, DNASE2, DFFB Controlled By POLA1 Promoter in Proliferating and Directed Differentiation Resisting Human Autologous Pluripotent J Stem Cell Res Ther Suppl 9:
Malecki, Marek; Tombokan, Xenia; Anderson, Mark et al. (2013) TRA-1-60(+), SSEA-4(+), POU5F1(+), SOX2(+), NANOG(+) Clones of Pluripotent Stem Cells in the Embryonal Carcinomas of the Testes. J Stem Cell Res Ther 3:
Malecki, Marek (2013) Improved targeting and enhanced retention of the human, autologous, fibroblast-derived, induced, pluripotent stem cells to the sarcomeres of the infarcted myocardium with the aid of the bioengineered, heterospecific, tetravalent antibodies. J Stem Cell Res Ther 3:
Malecki, Marek; Dahlke, Jessica; Haig, Melissa et al. (2013) Eradication of Human Ovarian Cancer Cells by Transgenic Expression of Recombinant DNASE1, DNASE1L3, DNASE2, and DFFB Controlled by EGFR Promoter: Novel Strategy for Targeted Therapy of Cancer. J Genet Syndr Gene Ther 4:152
Zarogoulidis, Paul; Darwiche, Kaid; Sakkas, Antonios et al. (2013) Suicide Gene Therapy for Cancer - Current Strategies. J Genet Syndr Gene Ther 4:
Malecki, Marek; Sabo, Chelsea; Putzer, Emily et al. (2013) Recruitment and retention of human autologous CD34+ CD117+ CD133+ bone marrow stem cells to infarcted myocardium followed by directed vasculogenesis: Novel strategy for cardiac regeneration. Mol Cell Ther 1:
Malecki, Marek; Malecki, Bianca (2012) Routing of Biomolecules and Transgenes' Vectors in Nuclei of Oocytes. J Fertili In Vitro 2012:108-118

Showing the most recent 10 out of 24 publications