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© INRES Nawaro

Dr. rer. hort. Thorsten Kraska

Researcher & Lecturer

INRES - Renewable Resources

INRES - Horticultural Science

Kontakt

+49 228/ 73-5155 (INRES Horticultural Sciences)

kraska@uni-bonn.de

Adresse

INRES Horticultural Sciences
Auf dem Hügel 6
53121 Bonn

Online Meetings & Office Hours

I am offering an online meeting point & office via Zoom. If you are interested, you can meet me there. The Zoom office is open whenever I am online available. Or write me a short e-mail and we will arrange a meeting.

Students are invited to join my eCampus group where you will find more informations. Students under my supervision will receive an invitation automatically.

My Zoom Meeting Point for you:
https://uni-bonn.zoom.us/j/95126751732?pwd=UU5aT0hMc2JqdnpTMElWOFNteGNvdz09

Research

Horticultural trials

I am a member of the research group for Renewable Resources and Horticultural Sciences within the Institute of Crop Science and Resource Conservation. My own research interests are

  • sustainable horticultural production
  • optimizing cultivation of crops under protected conditions
  • soilless cultivation of vegetables, ornamentals, and fruits using renewables as growing medium
  • alternative growing media for greenhouse production
  • optimization and full valorization of horticultural value chain including side streams
  • use of biorationals to protect crops against biotic and abiotic stress factors
  • bioactive substances from horticultural plants
  • non invasive phenotyping of plants

These research interests are focussed in three major areas:

Growing Media for sustainable plant production

We are particulary interested in the valorization of renewable biomass plants like Miscanthus as growing substrate for horticultural crops such as tomatoes, cucumbers, strawberries, or ornamentals. The research is focussed on Miscanthus as model for alternative growing medium. Our aim is to understand the complex substrate-plant-interactions to optimize plant performance. In our holistic approach we are further interested in the cascading utilization of the substrate before or after its use a growing medium (e.g. direct combustion, re-use as growing medium, feedstock for chemical induustry) including how a pretreatment of the original feedstock can improve quality, how Miscanthus as growing substrate is changing its properties over the cultivation period, and which alternative valorization strategies can be achieved by using Miscanthus as growing medium.  We could alreday show that Miscanthus is a feasible alternative to Stone Wool in soilless cultivation of tomatoes and cucumbers (Kraska et al., 2018, Nguyen et al., 2021). In these studies we could also demonstrate the cascading use a solid fuel showing possible Miscanthus Utilization Pathways as described in the MisCas project. Recently we show that Miscanthus could also be used in soilless cultivation of strawberries in the greenhouseunder practical conditions (Kraska et al., 2019).

Drying (self-drying, siccative) Plant Oils as Biorationals in Plant Protection

Plant oils have been used in plant protection and plant strenthening for many years. We are specifically interested in the utilization of plant oils (triglcerides) derived from linseed (Linum usitatissimum) and Tung Tree (Vernica fordii). These oils are drying through oxidation and build a film on surfaces. We use this self-drying characteristics to protect or to strengthen crops against abiotic and biotic environmental stresses. These plant oils can clearly be distinguished from other oils (essential oils, mineral oils) used in horticulture or agriculture by their chemistry. The oils we used are triglcerides. Their advantage is a low ecotoxicity. Projects so far have been supported by the German Federal Environmental Foundation (DBU) through a personal PhD grant and the Ministry for Environment, Agriculture, Conservation and Consumer Protection of the State of North Rhine-Westphalia (MLUNV) [more]. In 2021 we publish how a new formulation of linseed oil and tung oil protect Green Beans against Bean Rust (Uromyces appendiculatus) (Breiing et al., 20217). These drying oils could be used in organic farming due to their low ecotoxicology and good biological degradability.

plants-10-00143-g005.png
Figure 5 taken from Breiing et al. (2021) showing protective and curative control of bean rust after appication of drying oils (linseed oil, L and tung oil, T) in comparison to other treatments (see open access publication for details) © Breiing et al. (2021)

Valorization of tea hortensias

Hydrangea macrophylla ssp. serrata are traditionally used in China as ceremonial tea (Amacha). The sweet taste of this tea is based on Phyllodulcin. We are interested in the value chain and how cultivation of this crop can be done. Currently we are partner in the SweetTea Project funded by the FNR. In a published study (Moll et al., 2021) we investigated the effect of shading on the dihydroisocoumarin content of Phyllodulcin and Hydarngenol in three hortensia cultivars (Oamacha, Odoriko Amacha, Amagi Amacha). We could show a strong effect of cultivar, but also of leaf position. The effect of shading was not as strong, but we could show by phenotyping using hyperspectral measurements that the lighting regime has an influence on Hydrangea too.

Projects

I am / I have been involved in the following scientific projects:

Running:

  • SweetTea: Aufbau einer nachhaltigen Wertschöpfungskette für den natürlichen Geschmacksmodulierer Phyllodulcin auf Basis der Kultivierung, Prozessierung und Weiterentwicklung von Teehortensien (Hydrangea macrophylla), 2019-2021

Finished:

  • Selbsttrocknende Pflanzenöle (Selfdrying plant oils to protect crops against abiotic and biotic stress factors), 2018-2020
  • Renewable resources for sustainable production of ornamentals and vegetables in greenhouse, 2018-2020
  • RegAff: Regulatory Affairs for plant protection products, biorationals, biobased products and techniques. 2019-2020.
  • Biobasierte, selbsttrocknende Pflanzenölfilme zum Schutz von Pflanzen gegenüber Umweltstress (Substances from renewable resources to protect plants against stress), 2016-2019
  • BioIP - Bio Innovation Park Rheinland - Etablierung eines klimaneutralen, regionalen Wissenschafts- und Gewerbepark (Establishment of a clima neutral, regional Science and Industry Park), 2015-2017
  • MisQual - Genotype and environment as driving factors for quality of lignocelluloses from Miscanthus as raw material for industry, 2014-2015
  • MisCas - Cascade Utilization of Miscanthus to increase resource efficiency (Kaskadennutzung von Miscanthus zur Steigerung der Ressourceneffizienz), 2014-2015

Publications

Publications

  • Chakhashvili, E., Siegmann, B., Muller, O., Verrelst, J., Bendig, J., Kraska, T., Rascher, U. (2022). Retrieval of Crop Variables from Proximal Multispectral UAV Image Data Using PROSAIL in Maize Canopy. Remote Sensing, 14(5), 1247. https://doi.org/10.3390/rs14051247
  • He, F., Thiele, B., Kraska, T., Schurr, U., Kuhn, A.J. (2022). Effects of Root Temperature and Cluster Position on Fruit Quality of Two Cocktail Tomato Cultivars. Agronomy, 12(6), 1275. http://dx.doi.org/10.3390/agronomy12061275
  • Moll, M.D., Kahlert, L., Gross, E., Schwarze, E.‐C., Blings, M., Hillebrand, S., Ley, J., Kraska, T., Pude, R. (2022). VIS‐NIR Modeling of Hydrangenol and Phyllodulcin Contents in Tea‐Hortensia (Hydrangea macrophylla subsp. serrata). Horticulturae, 8, 264.https://doi.org/10.3390/horticulturae8030264
  • Moll, M.D., Tränkner, C., Blings, M., Schwarze, E.-C., Gross, E., Hillebrand, S., Ley, J., Kraska, T., Pude, R. (2022). Proposing a chemometric Normalized Difference Phyllodulcin Index (cNDPI) for phyllodulcin synthesis estimation. JARMAP,  Vol. 30. https://doi.org/10.1016/j.jarmap.2022.100398
  • Nguyen, V.T.H., Kraska, T., Winkler, W., Aydinlik, S., Jackson, B.E., Pude, R. (2022). Primary Mechanical Modification to Improve Performance of Miscanthus as Stand-Alone Growing Substrates. Agronomy, 12, 420. https://doi.org/10.3390/agronomy12020420
  • Breiing, V., Hillmer, J., Schmidt, C., Petry, M., Behrends, B., Steiner, U., Kraska, T., Pude, R. (2021). Fungicidal Efficacy of Drying Plant Oils in Green Beans Against Bean Rust (Uromyces appendiculatus). Plants, 10(1), 143. https://doi.org/10.3390/plants10010143
  • He, F., Thiele, B., Kraus, D., Bouteyine, S., Watt, M., Kraska, T., Schurr, U., Kuhn, A. J. (2021). Effects of Short-Term Root Cooling before Harvest on Yield and Food Quality of Chinese Broccoli (Brassica oleracea var. alboglabra Bailey). Agronomy, 11(3), 577.  https://doi.org/10.3390/agronomy11030577
  • Krämer, J., Siegmann, B., Kraska, T., Muller, O., Rascher, U. (2021). The potential of spatial aggregation to extract remotely sensed sun-induced fluorescence (SIF) of small-sized experimental plots for applications in crop phenotyping. International Journal of Applied Earth Observation and Geoinformation, 104, 102565. https://doi.org/10.1016/j.jag.2021.102565 
  • Luhmer, K., Blum, H., Kraska, T., Döring, T., Pude, R. (2021). Poppy (Papaver somniferum L.) Intercropping with Spring Barley and with White Clover: Benefits and Competitive Effects. Agronomy, 11(5), 948; https://doi.org/10.3390/agronomy11050948
  • Moll, M., Vieregge, A.S., Wiesbaum, C.Blings, M., Vana, F., Hillebrand, S., Ley, J., Kraska, T., Pude, R. (2021). Dihydroisocoumarin Content and Phenotyping of Hydrangea macrophylla subsp. serrata Cultivars under Different Shading Regimes. Agronomy, 11(9), 1743. https://doi.org/10.3390/agronomy11091743
  • Nguyen, V.T.H., Elfers, J., Kühn, H., Kraska, T., Pude, R. (2021). Different Miscanthus genotypes as growing media in soilless tomato cultivation and its subsequent use for combustion. Acta Hortic., 1305, 301-308. https://doi.org/10.17660/ActaHortic.2021.1305.41
  • Siegmann, B., Cendrero-Mateo, M.P., Cogliati, S., Damm, A., Gamon, J., Herrera, D., Jedmowski, C., Junker-Frohn, L.V., Kraska, T., Muller, O., Rademske, P., van der Tol, C., Quiros-Vargas, J. Yang, P., Rascher, U. (2021). Downscaling of far-red solar-induced chlorophyll fluorescence of different crops from canopy to leaf level using a diurnal data set acquired by the airborne imaging spectrometer HyPlant. Remote Sensing of Environment, 262, 112609. https://doi.org/10.1016/j.rse.2021.112609. 50 days free access (until 19 September 2021): https://authors.elsevier.com/c/1dV9l7qzStnqR
  • He, F., Thiele, B., Santhiraraja-Abresch, S., Watt, M., Kraska, T., Ulbrich, A., Kuhn, A.J. (2020). Effects of Root Temperature on the Plant Growth and Food Quality of Chinese Broccoli (Brassica oleracea var. alboglabra Bailey) . Agronomy, 10, 702. https://doi.org/10.3390/agronomy10050702
  • Heinemann, S., Siegmann, B., Thonfeld, T., Muro, J., Jedmowski, C., Kemna, A., Kraska, T., Muller, O., Schultz, J., Udelhoven, T., Wilke, N., Rascher, U. (2020). Land Surface Temperature Retrieval for Agricultural Areas Using a Novel UAV Platform Equipped with a Thermal Infrared and Multispectral Sensor. Remote Sens., 12, 1075. https://doi.org/10.3390/rs12071075
  • Quirós Vargas, J., Bendig, J., Mac Arthur, A., Burkart, A., Julitta, T., Maseyk, K., Thomas, R., Siegmann, B., Rossini, M., Celesti, M., Schüttemeyer, D., Kraska, T., Muller, O., Rascher, R. (2020). Unmanned Aerial Systems (UAS)-Based Methods for Solar Induced Chlorophyll Fluorescence (SIF) Retrieval with Non-Imaging Spectrometers: State of the Art. Remote Sens., 12(10), 1624; Online: https://www.mdpi.com/2072-4292/12/10/1624
  • Keller, B., Matsubara, S., Rascher, U., Pieruschka, R., Steier, A., Kraska, T., Muller, O. (2019). Genotype Specific Photosynthesis x Environment Interactions Captured by Automated Fluorescence Canopy Scans Over Two Fluctuating Growing Seasons. Frontiers in Plant Science, 10, Article 1482, Nov 2019. https://doi.org/10.3389/fpls.2019.01482
  • Siegmann, B., Alonso, L., Celesti, M., Cogliati, S.,Colombo, R., Damm, A., Douglas, S., Guanter, L., Hanus, J., Kataja, K. Kraska, T., Matveeva, M., Moreno, J., Muller, O., Pikl, M., Pinto, F., Quiros Vargas, J., Rademske, P., Rodriguez-Morene, F., Sabater, N., Schickling, A., Schüttemeyer, D., Zemek, F., Rascher, U. (2919). The High-Performance Airborne Imahing Spectrometer HyPlant - From Raw Images to Top-of-Canopy Reflectance and Fluorescence Products: Introduction of an Automatized Processing Chain. Remote Sensing, 11(23), 2760, https://doi.org/10.3390/rs11232760
  • He, F., Thiele, B., Watt, M., Kraska, T., Ulbrich, A., Kuhn, A.J. (2019). Effects of Root Cooling on Plant Growth and Fruit Quality of Cocktail Tomato during two consecutive seasons. J. Food Qual., Artcile ID 3598172. https://doi.org/10.1155/2019/3598172
  • Bergs, M., Völkering, G., Kraska, T., Pude, R., Do, X.T., Kusch, P., Monakhova, Y., Konow, C., Schulze, M. (2019). Miscanthus x giganteus Stem Versus Leaf-Derived Lgnins Differing in Monolignol Ratio and Linkage. Int. J. Mol. Sci., 20, 1200. https://doi.org/10.3390/ijms20051200
  • Wilke, N., Siegmann, B., Klingbeil, L., Burkart, A., Kraska, T., Muller, O., van Doorn, A., Heinemann, S., Rascher, U. (2019). Quantifying Lodging Percentage and Lodging Severity Using a UAV-Based Canopy Height Model Combined with an Objective Threshold Approach. Remote Sens., 11, 515. https://doi.org/10.3390/rs11050515
  • Yang, P., van der Tol, C., Verhoef, W., Damm, A., Schickling, A., Kraska, T., Muller, O., Rascher, U. (2019). Using reflectance to explain vegetation biochemical and structural effectson sun-induced chlorophyll fluorescence. Remote Sensing of Environment, 231, 110996. https://doi.org/10.1016/j.rse.2018.11.039
  • Thomas, S., Behmann, J., Steier, A., Kraska, T., Muller, O., Rascher, U., Mahlein, A.-K. (2018). Quantitative assessment of diseases severity and rating of barley cultivars based on hyperspectral imaging in a non-invasive, automated phenotyping platform. Plant Methods, 14(45). https://doi.org/10.1186/s13007-018-0313-8
  • Kraska, T., Kleinschmidt, B., Weinand, J., Pude, R. (2018). Cascading use of Miscanthus as growing substrate in soilless cultivation of vegetables (tomatoes, cucumbers) and subsequent direct combustion. Sci. Hort., 235, 205-213, https://doi.org/10.1016/j.scienta.2017.11.032
  • Burkart, A., Hecht, V.L., Kraska, T., Rascher, U. (2018). Phenological analysis of unmanned aerial vehicle based time series of barley imagery with high temporal resolution. Precision Agric., 19(1), 134-146.  http://dx.doi.org/10.1007/s11119-017-9504-y
  • Winzer, F. Kraska, T., Eisenberger, C., Kötter, T., Pude, R. (2017). Biomass from fruit trees for combined energy and food production. Biomass Bioenerg, 107, 279-286. https://doi.org/10.​1016/​j.​biombioe.​2017.​10.​027.
  • (Book Chapter) Cendrero-Mateo, M.P., Muller, O., Albrecht, H., Burkart, A., Gatzke, S., Janssen, B., Keller, B., Körber, N., Kraska, T., Matsubara, S., Li, J., Müller-Linow, M., Pieruschka, R., Pinto, F., Rischbeck, P., Schickling, A., Steier, A., Watt, M., Schurr, U., Rascher, U. (2017). Field Phenotyping: Concepts and Examples to Quantify Dynamic Plant Traits across Scales in the Field. In: Chabbi A., Loescher, H.W. (eds.): Terrestrial Ecosystem Research Infrastructure: Challenges and Opportunities. Chapter 3, 53-80. CRC Press, Taylor & Francis, Boca Raton, USA.
  • Ashrafuzzaman, Md., Lubna, F.A., Holtkamp, F., Manning, W.J.,  Kraska, T., Frei, M. (2017).  Diagnosing ozone stress and differential tolerance in rice (Oryza sativa L.) with ethylenediurea (EDU).  Environmental Pollution, 230, 339-350. http://dx.doi.org/10.1016/j.envpol.2017.06.055

Aufklapp-Text

  • Ueda, Y., Frimpong, F., Qi, Y., Matthus, E., Wu, L., Höller, S., Kraska, T., Frei, M. (2015). Genetic dissection of ozone tolerance in rice (Oryza sativa L.) by a genome-wide association study. J. Exp. Bot., 66(1), 293-306. http://dx.doi.org/10.1093/jxb/eru419
  • Rascher, U., Alonso, L., Burkart, A., Cilia, C., Cogliati, R., Colombo, R., Damm, A., DruschM., Guanter, L., Hanus, J., Hyvärinen, T., Julitta, T., Jussila, J., Kataja, K., Kokkalis, P., Kraft, S., Kraska, T., Matveeva, M., Moreno, J., Muller, O., Panigada, C., Pikl, M., Pinto, F., Prey, Pude, R., Rossini, M., Schickling, A., Schurr, U., Schüttemeyer; D., Verrelst, J., Zemek, F. (2015). Sun-induced fluorescence – a new probe of photosynthesis: First maps from the imaging spectrometer HyPlant. Global Change Biology, 21, 4673-4684. http://dx.doi.org/10.1111/gcb.13017
  • Pude, R., Wever, C., Kraska, T. (2022). Sustainable Resources: From Plants to Products. In: Lanzerath, D., Schurr, U., Pinsdorf, C., Stake, M. (eds.), Bioeconomy and Sustainability. Perspectives from Natural and Social Sciences, Economics and Ethics (pages 23-33), Springer, Cham, Switzerland. https://doi.org/10.1007/978-3-030-87402-5
  • Kraska, T., Pude, R. (2019). Miscanthus als Pflanzsubstrat für Erdbeeren - eine nachhaltige Alternative? Obstbau, 11/2019, 570-574 [PDF]
  • Muller, O., Keller, B., Zimmermann, L., Jedmowski, C., Kleist, E., Pingle, V., Acebron, K., Zendonadi dos Santos, N., Steier, A., Freiwald, L., Munoz-Fernandez, I, Wilke, N., Kraska, T., Pieruschka, R., Schurr, U., Rascher, U. (2018). Field Phenotyping and an example of proximal sensing of photosynthesis under elevated CO2.  IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 22-27 July 2018, Valencia, Spain, 8252-8254. http://doi.org/10.1109/IGARSS.2018.8517301
  • Hehmann, D., Völkering, G., Kraska, T., Pude, R. (2017). Entwicklung von Torfersatzstoffen auf der Basis von Nachwachsenden Rohstoffen. Mitt. Ges. Pflanzenbauwiss., 29, 96-97.
  • Kraska, T., Hehmann, D., Kleinschmidt, B., Weinand, J., Pude, R. (2016). Nutzungsmöglichkeiten von Nachwachsenden Rohstoffen in erdelosen Kultursystemen. Mitt. Ges. Pflanzenbauwiss., 28, 178-179. [PDF Tagungsband]
  • Kuhn, A.J., Stollberg, M., Gossen, M., Förster, S., Kraska, T. (2016). Einfluss von HTC-Kohle auf das Pflanzenwachstum in Topfversuchen. Mitt. Ges. Pflanzenbauwiss., 28, 176-177. [PDF Tagungsband]
  • Winzer, F. Kraska, T., Pude, R. (2016). Einsparung von mineralischen Düngern durch die Nutzung regionaler Reststoffströme. Mitt. Ges. Pflanzenbauwiss., 28, 278-279. [PDF Tagungsband]
  • Kraska, T., Winzer, F., Witzel, C.P., Finger, R., Pude, R. (2015). Cascade Utilization of Miscanthus. Biobased Future (Mitteilungsblatt über Biomasse für Energie und Industrie in einer nachhaltigen Wirtschaft), No 4, July 2015, 13. [Online]34
  • Winzer, F., Witzel, C.P., Kraska, T., Finger, R., Pude, R. (2015). Möglichkeiten der Kaskadennutzung von Miscanthus zur Erhöhung der Ressourceneffizienz. Mitt. Ges. Pflanzenbauwiss., 27, 23-24.
  • Hehmann, D., Kraska, T., Völkering, G., Pude, R. (2013). Nutzungsmöglichkeiten von mehrjährigen Biomassepflanzen als Torfesratz in Pflanzsubstraten. Mitt. Ges. Pflanzenbauwiss., 25, 253-254.
  • Kraska, T., Stewart, T. (2002). Diagnosis for Crop Protection - ein Planspiel in der phytomedizinischen Ausbildung. In: Blötz, H. (ed.). Planspiele in der beruflichen Bildung. Aktualisierter Planspielkatalog 2002 sowie Abriss zur Auswahl, Konzeptionierung und Anwendung von Planspielen. Multi Media Publication. Schriftenreihe des Bundesinstitut für Berufsbildung (BiBB). Bertelsmann Verlag, Bielefeld, Germany. Referenced in the apdated versions in 2008, 2015.
  • Hindorf, H., Kraska, T., Johnen, A, Thieron, M. (1999). Disease forecast systems optimising fungicide application in Germany with special reference to PRO_PLANT. In: Lyr, H., Russell, P.E., Dehne, H.-W., Sisler, H.D. (eds.). Modern Fungicides and Antifungal Compounds. 12th International Reinhardsbrunn Symposium, 24-29 May 1998, Friedrichroda, Germany. pages 69-73.
  • Kraska T. (1999). Plant Pathology and the Internet. In: Lyr, H., Russell, P.E., Dehne, H.-W., Sisler, H.D. (eds.). Modern Fungicides and Antifungal Compounds. 12th International Reinhardsbrunn Symposium, 24-29 May 1998, Friedrichroda, Germany. pages 69-73.

Patents

  • Petry, M., Pude, R., Kraska, T. (2018). Verfahren zur Herstellung eines Pflanzenbehandlungsmittels und Verfahren zur Behandlung von Pflanzen (DE 10 2017 000 110 A1 2018.07.12). Offenlegungsschrift vom 12.07.2018 Deutsches Patent- und Markenamt. Online verfügbar: http://www.freepatentsonline.com/DE102017000110.html
  • Skrobek, A., Dehne, H.-W., Kraska, T., Hintz, S., Sieverding, E., Busch, J. (2003). Composition containing fungus and polymeric additive, useful for controlling pests, e.g. insects on plants, has increased activity and stability (DE10148570A1). Offenlegungsschrift vom 10.04.2003 Deutsches Patent- und Markenamt. Online verfügbar: http://www.freepatentsonline.com/DE10148570.html

Teaching

  •  Aktuelle Entwicklungen in den Nutzpflanzenwissenschaften (B-A-P-10), Wintersemester, BSc Agrarwissenschaften
  • Agrar- und Ernährungsforschung (B-AE-O-01), Sommersemester, BSc Agrarwissenschaften, BSc Ernährungs- und Lebensmittelwissenschaften, BSc Ernährungs- und Hauswirtschaftswissenschaft LA BK
  • Tutorenpraktikum (B-AE-O-02), Winter- und Sommersemester, BSc Agrarwissenschaften, BSc Ernährungs- und Lebensmittelwissenschaften, BSc Ernährungs- und Hauswirtschaftswissenschaft LA BK
  • Projektseminar Nachwachsende Rohstoffe (B-A-O-03), Winter- und Sommersemester, BSc Agrarwissenschaften
  • Projektarbeit und Seminar zu Nachwachsenden Rohstoffen (Project module renewable resources) (MA-E-11-PM), Winter- und Sommersemester, MSc Nutzpflanzenwissenschaften (Crop Science)

Further details: Study programs3711 of the Agricultural Faculty or contact me concerning modules I'm involved in.

Service Learning Projects
In cooperation with Service Learning at University of Bonn38 student projects are organized and supervised. Service Learning is an exciting opportunity to get students involved in small research projects with partners from outside the University within their study program. In the following examples of service learning projects I have supervised. If you are interested in such projects in the field of renewable resources of horticulture, contact me.

  • "Das interessiert uns die Bohne" - ein Kaffeesatzprojekt an der Universität Bonn39. Marie Keul, Matthias Spiess, Leon Kalkert and Tom Hasselt were working in summer term 2021 on the utilization of spent coffee ground and came up with several ideas. One of these ideas were small fire starters for BBQ. The upper heating value of spent coffee ground is even higher than that of wood [see Poster]. In her Bachelor Thesis "Nutzungsmöglichkeiten von Kaffeesatz" Marie Keul reviewed this still under-utilized renewable resource in detail.
  • Was is(s)t Bonn40 was a service learning project by Lilian Kupfer and Luisa Beinert in summer term 2021 where the explore the utilization of a guided tour via App through Bonn with a special emphasis on sustainability.

BSc/MSc Thesis

I am always on the lookout for highly self-motivated students, who are encouraged and passionate for science. You are invited to join into our research projects and you will be welcomed in our team. Feel free to contact me any time to find out which research topic suits you best.

If you are interested in a BSc or MSc thesis, please contact me.  A list of supervised BSc and MSc theses can be found here (browse through the list for TK).

...from the past: my PhD research

During my PhD and also a short time after finishing my PhD I have worked on induced resistance in plants. During this research I have worked on possible effects of resistance inducers on DNA methylation. This work has beside my PhD thesis only partly been published. Very recently I have scanned my PhD thesis and the two publications on the topic to make it public.
 
Kraska, T. (1996). Vergleichende Untersuchungen von Resistenzinduktoren, deren Wirkungsweisen und dem EInfluß auf die DNA-Methylierung (Comparative investigations on resistance inducers, their mode of action, and effects on DNA Methylation). Diss. University of Hannover, Germany. Papierflieger, Clausthal-Zellerfeld, ISBN 3-931986-69-1 nawaro . Online (2019): http://dx.doi.org/10.13140/RG.2.2.22058.98246/2 4140 (open access)

  • Schönbeck, F., Kraska, T. (1995): Induced resistance: Mechanisms and application.  3rd Conference of European Foundation for Plant Pathology on Environmental Biotic Factors in Integrated Plant Disease Control. 05-09 September 1995, Polish Acad. Sci, Sci Ctr, Poznan, Poland. pages 495-499.
  • Kraska, T., Schönbeck, F. (1993). About Changes in the Chromatin Structure after Resistance Induction in Hordeum vulgare L. Journal of Phytopathology 137(1):10 - 14. http://10.1111/j.1439-0434.1993.tb01320.x 42 . Online as  PDF
  • Kraska T., Schönbeck F. (1993) Resistance Induction in Barley and the Influence on Genomic DNA Methylation. In: Fritig B., Legrand M. (eds) Mechanisms of Plant Defense Responses. Developments in Plant Pathology, vol 2. Springer, Dordrecht. pages 383-383. https://doi.org/10.1007/978-94-011-1737-1_119 43nawaro
  • Schönbeck, F., Steiner, U., Kraska, T. (1993). Induzierte Resistenz: Kriterien, Mechanismen, Anwendung und Bewertung. Induced resistance: Criteria, mechanisms, practical application and estimation. J. Plant Diseases and Protection, 100(5), 541-557. Available at: https://www.jstor.org/stable/4338681044

...more about me

Here you will find more about me in an uncategorized manner.