Posted in | News | Imaging

WITec Paper Award 2019

WITec is pleased to announce the winners of the annual Paper Award, which recognizes three outstanding peer-reviewed articles from the previous year that feature data acquired with a WITec microscope.

Choosing from among the many excellent publications is never an easy task and WITec thanks all the researchers who submitted their work. This year’s winners are scientists from Austria, England and Finland, who used Raman imaging in their studies of heartwood formation, the origin of Palaeoproterozoic granules and threading dislocations in a semiconducting material.

The Paper Award GOLD

The oldest trees are several thousand years old. How do they reach such an impressive age? During heartwood formation, many trees produce substances which protect them against bacteria, fungi or insects. Martin Felhofer from the University of Natural Resources and Life Sciences in Vienna, Austria, receives the Gold Paper Award 2019 for his research on such impregnating substances, together with his colleagues Batirtze Prats-Mateu, Peter Bock and Notburga Gierlinger. Using confocal Raman imaging, they revealed the sub-cellular distribution of pinosylvins and lipids in different parts of pine tree sections. Both compounds co-localized, but their ratio changed during heartwood formation. While pinosylvins dominated in the heartwood, the sapwood contained mainly lipids. Spruce sapwood usually doesn’t produce pinosylvins. Nevertheless, in vitro impregnation of spruce sapwood with pine extract reproduced the distribution patterns from pine. Thus, the authors hypothesized that the “symbiotic relationship between pinosylvins and lipids” is important for the impregnation process during heartwood formation and protection of the wood against decay.

The Paper Award SILVER

Traces of early microbial life on Earth can be found in the form of their biosignatures preserved in sedimentary rocks. Valuable information on the origin of life can thus be gained from the characterization of sediments. However, deciding if the organic material in sediments is actually of biological origin is not always straightforward. Matthew S. Dodd from University College London, UK, receives the Silver Paper Award 2019 for investigating the origins of granular iron formations (GIFs) together with his colleagues Dominic Papineau, Zhenbing She, Marilyn L. Fogel, Sandra Nederbragt and Franco Pirajno from research institutions worldwide. The origins of GIFs continue to be debated. There are publications that provide support for theories of sediment reworking, mineral precipitation or biological origins. Together with his colleagues, Matthew Dodd characterized Palaeoproterozoic granules from various locations around the world (China, USA, Canada and Australia) using Raman imaging and other techniques. They discussed their findings with respect to potential origins of the granules and found that biological processes and chemically-oscillating reactions played a key role in GIF formation in all locations, although other processes may have contributed as well. For example, some GIFs originated from diagenetic reactions, in which organic matter was oxidized while sulphate or ferric iron was reduced by sulphate- or iron-reducing bacteria. The authors concluded that, “As such, granules have excellent potential to be considered as promising biosignatures for studying Precambrian biogeochemistry, as well as astrobiology.”

The Paper Award BRONZE

Optoelectronic devices, such as light-emitting diodes, detectors, satellites or solar cells, are often produced from gallium nitride (GaN) due to the advantageous properties of this semiconducting material. Methods for growing high-quality GaN crystals are thus required and defects in the crystals need to be detected efficiently and without damaging the sample. Joonas T. Holmi from Aalto University in Finland receives the Bronze Paper Award 2019 for showing how 3D Raman imaging can characterize threading dislocations (TDs) in α-GaN crystals, together with his colleagues Bakhysh H. Bairamov, Sami Suihkonen and Harri Lipsanen. TDs cause local stress in the α-GaN crystal, a defect that is not visible in a wide-field image. However, the stress field causes some peak shifts in the Raman spectrum. Quantifying the Raman peak shift of E2H at each position on the crystal surface made it possible to locate the distortions and estimate the TD density. By recording z-stacks, the propagation of the stress field into the crystal volume could be visualized in 3D. The described method could even characterize the TDs further, distinguishing between edge a-type and mixed a+c-type TDs and the authors discuss how the method can be extended to also identify screw c-type TDs. They conclude by recommending 3D confocal Raman imaging for characterizing TD types in ammonothermally grown α-GaN crystals.

The WITec Paper Award 2019 Winners

GOLD: Martin Felhofer, Batirtze Prats-Mateu, Peter Bock, Notburga Gierlinger (2018) Antifungal stilbene impregnation: transport and distribution on the micron-level. Tree Physiology 38, pp. 1526-1537.

SILVER: Matthew S. Dodd, Dominic Papineau, Zhenbing She, Marilyn L. Fogel, Sandra Nederbragt, Franco Pirajno (2018) Organic remains in late Palaeoproterozoic granular iron formations and implications for the origin of granules. Precambrian Research 310, pp. 133-152.

BRONZE: Joonas T. Holmi, Bakhysh H. Bairamov, Sami Suihkonen, Harri Lipsanen (2018) Identifying threading dislocation types in ammonothermally grown bulk α-GaN by confocal Raman 3-D imaging of volumetric stress distribution. Journal of Crystal Growth 499, pp. 47-54.

For a list of all previous Paper Award winners, please visit

WITec announces the Paper Award 2020

Scientists from all fields of application are invited to participate in the Paper Award 2020 ( Articles published in 2019 in a peer-reviewed journal that feature data obtained with a WITec microscope can be submitted to [email protected] by January 31st, 2020. WITec is looking forward to receiving many outstanding publications again.



Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    WITec GmbH. (2019, July 13). WITec Paper Award 2019. AZoOptics. Retrieved on April 20, 2024 from

  • MLA

    WITec GmbH. "WITec Paper Award 2019". AZoOptics. 20 April 2024. <>.

  • Chicago

    WITec GmbH. "WITec Paper Award 2019". AZoOptics. (accessed April 20, 2024).

  • Harvard

    WITec GmbH. 2019. WITec Paper Award 2019. AZoOptics, viewed 20 April 2024,

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.