Measurement of pH micro-heterogeneity in natural cheese matrices by fluorescence lifetime imaging

  • 1Teagasc Food Research Centre, Moorepark, Fermoy, Ireland
  • 2Department of Biology, W. M. Keck Center for Cellular Imaging, University of Virginia, Charlottesville, VA, USA
  • 3Department of Sport Medicine, Third Faculty of Medicine, Charles University, Prague, Czech Republic
  • 4Department of Life Sciences, Faculty of Science and Engineering, University of Limerick, Limerick, Ireland
  • 5Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic

 

Abstract: http://journal.frontiersin.org/article/10.3389/fmicb.2015.00183/abstract

Keywords: cheese matrix, C-SNARF-4, Oregon Green, pH micro-heterogeneity, fluorescence lifetime, FLIM, natural cheese

Citation: Burdikova Z, Svindrych Z, Pala J, Hickey CD, Wilkinson MG, Panek J, Auty MAE, Periasamy A and Sheehan JJ (2015) Measurement of pH micro-heterogeneity in natural cheese matrices by fluorescence lifetime imaging. Front. Microbiol. 6:183. doi: 10.3389/fmicb.2015.00183

Received: 28 September 2014; Accepted: 19 February 2015;
Published: 06 March 2015.

Nobel prize in Chemistry 2014 was awarded jointly to Eric Betzig, Stefan W. Hell and William E. Moerner “for the development of super-resolved fluorescence microscopy”! 

Eric Betzig
Janelia Farm Research Campus, Howard Hughes Medical Institute, Ashburn, VA, USA,

Stefan W. Hell
Max Planck Institute for Biophysical Chemistry, Göttingen, and German Cancer Research Center, Heidelberg, Germany

and

William E. Moerner
Stanford University, Stanford, CA, USA

“for the development of super-resolved fluorescence microscopy”

Source: Surpassing the limitations of the light microscope

Details on scientific backgroung: Super-resolved fluorescence microscopy.pdf

14 Feb 2014

The opening of the confocal imaging facility is organized at Ruder Boskovic Institute in Zagreb in Februady 27, 2014. The meeting consists of lectures focused on the current advanced methods in confocal microscopy nowdays, and application lectures. In the afternoon, there will be introduced the best microscope worldwide for the advanced image acquisition, live cells imaging and spectral based FLIM – Leica TCS SP8 X SMD.

20140227-IRB_Zagreb-confocal-opening-web

The confocal imaging facility is equipped with newly installed Leica TCS SP8 X SMD and Leica TCS SP2 AOBS confocal laser scanning microscopes. Leica TCS SP8 X SMD is equipped with:
– pulsed White Light Laser with full tunability in 1 nm step size in the spectrum 470-670 nm
– tandem scanner consisting of FOV scanner with maximum file format 64 MPx, and the fastest scanner worldwide with 40 fps at 512×512 pxls in several spectral detectors
– combination of PMT, FLIM-PMT and HyD spectral detectors for and ideal optimalization of experimental setup
– PicoQuant detection for two channel spectral detection of FLIM

13 Dec 2013

Two Ph.D. students – Mgr. Lucie Nováková and Mgr. Kristína Kovačovicová from the lab of MVDr. Martin Anger, Ph.D. (CEITEC Veterinary Institute Brno, Czech Republic) were successful in Leica Microsystem calendar contest. Their images are presented in Leica calendar 2014 – November and December.

A whole calendar is available at: Leica Microsystems Calendar 2014 – Now and Then

Standard 3D scanning modes in confocal laser scanning microscopy.

Meiotic Maturation: The image is a montage of selected time frames from a time-lapse recording of the meiotic maturation of a mouse oocyte. The images are an overlay of fluorescence images with images acquired using transmitted light as contrasting method.
Meiotic Maturation: The image is a montage of selected time frames from a time-lapse recording of the meiotic maturation of a mouse oocyte. The images are an overlay of fluorescence images with images acquired using transmitted light as contrasting method.
 Polar Body Extrusion: Montage of spindles from mouse oocytes during the polar body extrusion process.
Polar Body Extrusion: Montage of spindles from mouse oocytes during the polar body extrusion process.
11 Dec 2013

Description from Nature Medicine, Dec 2013, Vol. 19, No. 12:
“Improved methods for identifying and tracking single podocytes in the intact kidney could improve our understanding of the mechanisms of glomerular injury and regeneration. In this issue (p1661), Janos Peti-Peterdi and his colleagues describe the use of Podocin-Confetti mice to image podocytes in vivo. The cover shows podocytes labeled in one of four colors (blue, green, yellow or red) and the renal vasculature.”

11 Dec 2013

The Advanced Techniques Day focused on advanced microscopy technique of superresolution microscopy STED and novel 3D STED will be held at Vinicna 7, Prague 2 (lecture hall B3-Fotochemie). This technique is able to scan your samples in a very low illumination volume down to 50 nm in xy plane and <120 nm in z plane without additional data processing.

STED_Leica_Event

12. 12. Superresolution microscopy (STED & 3D STED) plus confocal bits

9:00 – 10:00 Rolf Borlinghaus (Senior Scientist, Leica Microsystems), Three Dimensions in Microscopy – spectral confocal and a preview on 3D-STED
10:00 – 11:00 Alberto Diaspro (Director Nanophysics IIT Genova), Pushing STED further
11:00 – 11:15 Coffee break
11:15 – 12:00 Bettina Griesshaber (Product Manager Confocal DSA, Leica Microsystems), Deeper imaging with TCS SP8 MP
12:00 – 13:00 Summary and discussion

28 Sep 2013

Optical imaging devices have a finite depth of field and diffraction-limited resolution. The depth of field problem was tackled first with confocal microscopes; diffraction-unlimited resolution has been available for a few years now with super-resolution microscopes. Super-resolution microscopes with a solved depth of field problem are now available. Localization super-resolution uses astigmatism-based z-coding. STED super-resolution employs a mixed phase mask concept for tunable super-resolution in lateral and axial dimensions. Dr. Rolf T. Borlinghaus

Read more at: Super-resolution Microscopy and the Third Dimension