Virpi Virjamo

Characterisation, Recovery and Activity of Hydrophobic Compounds in Norway Spruce Log Soaking Pit Water: Could they be Used in Wood Preservative Formulations?

Barbero-López, Aitor; Vek, Viljem; Poljanšek, Ida; Virjamo, Virpi; López-Gómez, Yeray Manuel; Sainio, Tuomo; Humar, Miha; Oven, Primož; Haapala, Antti. 2022. Waste and biomass valorization. 13: 2553-2564 A1 Journal article (refereed), original research

Responses in growth and emissions of biogenic volatile organic compounds in Scots pine, Norway spruce and silver birch seedlings to different warming treatments in a controlled field experiment

Pikkarainen, Laura; Nissinen, Katri; Ghimire, Rajendra Prasad; Kivimäenpää, Minna; Ikonen, Veli-Pekka; Kilpeläinen, Antti; Virjamo, Virpi; Yu, Hao; Kirsikka-Aho, Sara; Salminen, Timo; Hirvonen, Jukka; Vahimaa, Timo; Luoranen, Jaana; Peltola, Heli. 2022. Science of the total environment. 821: A1 Journal article (refereed), original research

Accumulation of phenolics and growth of dioecious Populus tremula (L.) seedlings over three growing seasons under elevated temperature and UVB radiation

Sobuj, Norul; Nissinen, Katri; Virjamo, Virpi; Salonen, Anneli; Sivadasan, Unnikrishnan; Randriamanana, Tendry; Ikonen, Veli-Pekka; Kilpeläinen, Antti; Julkunen-Tiitto, Riitta; Nybakken, Line; Mehtätalo, Lauri; Peltola, Heli. 2021. Plant physiology and biochemistry. 165: 114-122 A1 Journal article (refereed), original research

Changes in light spectra modify secondary compound concentrations and BVOC emissions of Norway spruce seedlings

Kivimäenpää, Minna; Virjamo, Virpi; Ghimire, Rajendra P.; Holopainen, Jarmo K.; Julkunen-Tiitto, Riitta; Martz, Françoise; Nissinen, Katri; Riikonen, Johanna. 2021. Canadian journal of forest research-revue canadienne de recherche forestiere. 51: 1218-1229 A1 Journal article (refereed), original research

Protein and phenolic content and antioxidant capacity of honey bee-collected unifloral pollen pellets from Finland

Salonen, Anneli; Lavola, Anu; Virjamo, Virpi; Julkunen-Tiitto, Riitta. 2021. Journal of apicultural research. 60: 744-750 A1 Journal article (refereed), original research

1,6-Dehydropinidine Is an Abundant Compound in Picea abies (Pinaceae) Sprouts and 1,6-Dehydropinidine Fraction Shows Antibacterial Activity against Streptococcus equi Subsp. equi

Virjamo, Virpi; Fyhrquist, Pia; Koskinen, Akseli; Lavola, Anu; Nissinen, Katri; Julkunen-Tiitto, Riitta. 2020. Molecules. 25: 4558 A1 Journal article (refereed), original research

Characterization of spruce log soaking water and their antifungal and wood preserving properties

Barbero-López, Aitor; Vek, Viljem; Virjamo, Virpi; Poljan¨ek, Ida; Humar, Miha; Oven, Primo¸; Haapala, Antti. Teoksessa: LeVan-Green, Susan(toim.) , 2020. Proceedings of the 2020 Society of Wood Science and Technology International Convention Renewable Resources for a Sustainable and Healthy Future"". s. 327-332. Society of Wood Science and Technology D3 Professional conference proceedings

Genetic modification of the flavonoid pathway alters growth and reveals flexible responses to enhanced UVB - Role of foliar condensed tannins

Thitz, Paula; Hagerman, Ann E; Randriamanana, Tendry R; Virjamo, Virpi; Kosonen, Minna; Lännenpää, Mika; Nyman, Tommi; Mehtätalo, Lauri; Kontunen-Soppela, Sari; Julkunen-Tiitto, Riitta. 2020. Plant-environment interactions. 2021; 2: 1-15 A1 Journal article (refereed), original research

Growth Responses of Boreal Scots Pine, Norway Spruce and Silver Birch Seedlings to Simulated Climate Warming over Three Growing Seasons in a Controlled Field Experiment

Nissinen, Katri; Virjamo, Virpi; Kilpeläinen, Antti; lkonen, Veli-Pekka; Pikkarainen, Laura; Ärväs, lida-Liina; Kirsikka-aho, Sara; Peltonen, Anna; Sobuj, Norul; Sivadasan, Unnikrishnan; Zhou, Xiao; Ge, Zhen-Ming; Salminen, Timo; Julkunen-Tiitto, Riitta; Peltola, Heli. 2020. Forests. 11: 943 A1 Journal article (refereed), original research

Revalorization of coffee silverskin as a potential feedstock for antifungal chemicals in wood preservation

Barbero-López, Aitor; Monzó-Beltrán, Juanjo; Virjamo, Virpi; Akkanen, Jarkko; Haapala, Antti. 2020. International biodeterioration and biodegradation. 152: 105011 A1 Journal article (refereed), original research

Responses in growth and phenolics accumulation to lateral bud removal in male and female saplings of Populus tremula (L.) under simulated climate change

Sobuj, N; Virjamo, V; Nissinen, K; Sivadasan, U; Mehtätalo, L; Nybakken, L; Peltola, H; Julkunen-Tiitto, R. 2019. Science of the total environment. 2020; 704: 135462 A1 Journal article (refereed), original research

A Seven-Year Study of Phenolic Concentrations of the Dioecious Salix myrsinifolia

Nissinen, Katri; Virjamo, Virpi; Mehtätalo, Lauri; Lavola, Anu; Valtonen, Anu; Nybakken, Line; Julkunen-Tiitto, Riitta. 2018. Journal of chemical ecology. 44: 416-430 A1 Journal article (refereed), original research

Climate Change Effects on Secondary Compounds of Forest Trees in the Northern Hemisphere

Holopainen, Jarmo K; Virjamo, Virpi; Ghimire, Rajendra P; Blande, James D; Julkunen-Tiitto, Riitta; Kivimäenpää, Minna. 2018. Frontiers in plant science. 9: 1445 A2 Review article, Literature review, Systematic review

Dry-air drying at room temperature - a practical pre-treatment method of tree leaves for quantitative analyses of phenolics?

Tegelberg, Riitta; Virjamo, Virpi; Julkunen-Tiitto, Riitta. 2018. Phytochemical analysis. 29: 493-499 A1 Journal article (refereed), original research

Effects of soil pyrene contamination on growth and phenolics in Norway spruce (Picea abies) are modified by elevated temperature and CO2

Zhang, Y; Virjamo, V; Du, W; Yin, Y; Nissinen, K; Nybakken, L; Guo, H; Julkunen-Tiitto, R. 2018. Environmental science and pollution research. 25: 12788-12799 A1 Journal article (refereed), original research

Elevated temperature and CO2 affect responses of European aspen (Populus tremula) to soil pyrene contamination

Zhang, Y; Virjamo, V; Sobuj, N; Du, W; Yin, Y; Nybakken, L; Guo, H; Julkunen-Tiitto, R. 2018. Science of the total environment. 634: 150-157 A1 Journal article (refereed), original research

Quality and quantity of piperidine alkaloids in needles and bark of Scots pine (Pinus sylvestris) seedlings

Virjamo, Virpi; Julkunen-Tiitto, Riitta. 2018. Phytochemistry letters. 26: 106-109 A1 Journal article (refereed), original research

Sex-related responses of European aspen (Populus tremula L.) to combined stress: TiO2 nanoparticles, elevated temperature and CO2 concentration

Zhang, Y; Virjamo, V; Sobuj, N; Du, W; Yin, Y; Nybakken, L; Guo, H; Julkunen-Tiitto, R. 2018. Journal of hazardous materials. 352: 130-138 A1 Journal article (refereed), original research

Effect of climate change on bud phenology of young aspen plants (Populus tremula. L)

Sivadasan Unni, Randriamanana Tendry, Chenhao Cao, Virjamo Virpi, Nybakken Line, Julkunen-Tiitto Riitta. 2017. Ecology and evolution. 7: 7998-8007 A1 Journal article (refereed), original research

Epidihydropinidine, the main piperidine alkaloid compound of Norway spruce (Picea abies) shows promising antibacterial and anti-Candida activity

Fyhrquist P, Virjamo V, Hiltunen E, Julkunen-Tiitto R. 2017. Fitoterapia. 117: 138-146 A1 Journal article (refereed), original research

Impacts of elevated temperature and CO2 concentration on growth and phenolics in the sexually dimorphic Populus tremula (L.)

Sobuj Norul, Virjamo Virpi, Zhang Yaodan, Nybakken Line, Julkunen-Tiitto Riitta. 2017. Environmental and experimental botany. 146: 34-44 A1 Journal article (refereed), original research

Phytochemical variation in the plant-part specific phenols of wild crowberry (Empetrum hermaphroditum Hagerup) populations

Lavola Anu, Salonen Anneli, Virjamo Virpi, Julkunen-Tiitto Riitta. 2017. Phytochemistry letters. 21: 11-20 A1 Journal article (refereed), original research

Production of glandular trichomes responds to water stress and temperature in silver birch (Betula pendula) leaves

Thitz P, Possen BJHM, Oksanen E, Mehtätalo L, Virjamo V, Vapaavuori E. 2017. Canadian journal of forest research-revue canadienne de recherche forestiere. 47: 1075-1081 A1 Journal article (refereed), original research

Responses of growth and leaf phenolics in European aspen (Populus tremula) to climate change during juvenile phase change

Nissinen Katri, Virjamo Virpi, Randriamanana Tendry, Sobuj Norul, Sivadasan Unnikrishnan, Mehtatalo Lauri, Beuker Egbert, Julkunen-Tiitto Riitta, Nybakken Line. 2017. Canadian journal of forest research-revue canadienne de recherche forestiere. 47: 1350-1363 A1 Journal article (refereed), original research

Screening bioactivity and bioactive constituents of Nordic unifloral honeys

Salonen Anneli, Virjamo Virpi, Tammela Päivi, Fauch Laure, Julkunen-Tiitto Riitta. 2017. Food chemistry. 237: 214-224 A1 Journal article (refereed), original research

Slow-growing Salix repens (Salicaceae) benefits from changing climate

Nissinen Katri, Nybakken Line, Virjamo Virpi, Julkunen-Tiitto Riitta. 2016. Environmental and Experimental Botany. 128: 59-68 A1 Journal article (refereed), original research

Variation in piperidine alkaloid chemistry of Norway spruce (Picea abies) foliage in diverse geographic origins grown at the same area

Virjamo Virpi, Julkunen-Tiitto Riitta. 2016. Canadian journal of forest research-revue canadienne de recherche forestiere. 46: 456-460 A1 Journal article (refereed), original research

Boreal woody species resistance affected by climate change

Julkunen-Tiitto R, Nybakken L, Randriamanana T, Virjamo V. Teoksessa: Christer Björkman, Pekka Niemelä(toim.) , 2015. Climate change and insect pests. s. 54-73. CABI A3 Book section, Chapters in research books

Combined effect of elevated UVB, elevated temperature and fertilization on growth, needle structure and phytochemistry of young Norway spruce (Picea abies) seedlings

Virjamo Virpi, Sutinen Sirkka, Julkunen-Tiitto Riitta. 2014. Global change biology. 20: 2252-2260 A1 Journal article (refereed), original research

Differences in vole preference, secondary chemistry and nutrient levels between naturally regenerated and planted Norway spruce seedlings

Virjamo V, Julkunen-Tiitto R, Henttonen H, Hiltunen E, Karjalainen R, Korhonen J, Huitu O. 2013. Journal of chemical ecology. 39: 1322-1334 A1 Journal article (refereed), original research

Piperidine alkaloids of Norway spruce (Picea abies L. Karsten): Relations with genotypes, season, environment and phenolics

Virjamo Virpi. 2013. Publications of the University of Eastern Finland. Dissertations in Forestry and Natural Sciences G5 Doctoral dissertation (article)

Shoot development of Norway spruce (Picea abies) involves changes in piperidine alkaloids and condensed tannins

Virjamo V, Julkunen-Tiitto R. 2013. Trees-structure and function. Published online: DEC 2013: - A1 Journal article (refereed), original research

Effects of deficiency and overdose of group 2 sigma factors in triple inactivation strains of Synechocystis sp. strain PCC 6803

Pollari M, Rantamäki S, Huokko T, Kårlund-Marttila A, Virjamo V, Tyystjärvi E, Tyystjärvi T. 2011. Journal of bacteriology. 193: 265-273 A1 Journal article (refereed), original research

Alkaloid content of nursery garden seedlings and natural seedlings of Norway spruce (Picea abies)

Virjamo V, Julkunen-Tiitto R, Hiltunen E. 2010. Planta medica

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Characterisation, Recovery and Activity of Hydrophobic Compounds in Norway Spruce Log Soaking Pit Water: Could they be Used in Wood Preservative Formulations?

Responses in growth and emissions of biogenic volatile organic compounds in Scots pine, Norway spruce and silver birch seedlings to different warming treatments in a controlled field experiment

Accumulation of phenolics and growth of dioecious Populus tremula (L.) seedlings over three growing seasons under elevated temperature and UVB radiation

Changes in light spectra modify secondary compound concentrations and BVOC emissions of Norway spruce seedlings

Protein and phenolic content and antioxidant capacity of honey bee-collected unifloral pollen pellets from Finland

1,6-Dehydropinidine Is an Abundant Compound in Picea abies (Pinaceae) Sprouts and 1,6-Dehydropinidine Fraction Shows Antibacterial Activity against Streptococcus equi Subsp. equi

Characterization of spruce log soaking water and their antifungal and wood preserving properties

Genetic modification of the flavonoid pathway alters growth and reveals flexible responses to enhanced UVB - Role of foliar condensed tannins

Growth Responses of Boreal Scots Pine, Norway Spruce and Silver Birch Seedlings to Simulated Climate Warming over Three Growing Seasons in a Controlled Field Experiment

Revalorization of coffee silverskin as a potential feedstock for antifungal chemicals in wood preservation

Responses in growth and phenolics accumulation to lateral bud removal in male and female saplings of Populus tremula (L.) under simulated climate change

A Seven-Year Study of Phenolic Concentrations of the Dioecious Salix myrsinifolia

Climate Change Effects on Secondary Compounds of Forest Trees in the Northern Hemisphere

Dry-air drying at room temperature - a practical pre-treatment method of tree leaves for quantitative analyses of phenolics?

Effects of soil pyrene contamination on growth and phenolics in Norway spruce (Picea abies) are modified by elevated temperature and CO2

Elevated temperature and CO2 affect responses of European aspen (Populus tremula) to soil pyrene contamination

Quality and quantity of piperidine alkaloids in needles and bark of Scots pine (Pinus sylvestris) seedlings

Sex-related responses of European aspen (Populus tremula L.) to combined stress: TiO2 nanoparticles, elevated temperature and CO2 concentration

Effect of climate change on bud phenology of young aspen plants (Populus tremula. L)

Epidihydropinidine, the main piperidine alkaloid compound of Norway spruce (Picea abies) shows promising antibacterial and anti-Candida activity

Impacts of elevated temperature and CO2 concentration on growth and phenolics in the sexually dimorphic Populus tremula (L.)

Phytochemical variation in the plant-part specific phenols of wild crowberry (Empetrum hermaphroditum Hagerup) populations

Production of glandular trichomes responds to water stress and temperature in silver birch (Betula pendula) leaves

Responses of growth and leaf phenolics in European aspen (Populus tremula) to climate change during juvenile phase change

Screening bioactivity and bioactive constituents of Nordic unifloral honeys

Slow-growing Salix repens (Salicaceae) benefits from changing climate

Variation in piperidine alkaloid chemistry of Norway spruce (Picea abies) foliage in diverse geographic origins grown at the same area

Boreal woody species resistance affected by climate change

Combined effect of elevated UVB, elevated temperature and fertilization on growth, needle structure and phytochemistry of young Norway spruce (Picea abies) seedlings

Differences in vole preference, secondary chemistry and nutrient levels between naturally regenerated and planted Norway spruce seedlings

Piperidine alkaloids of Norway spruce (Picea abies L. Karsten): Relations with genotypes, season, environment and phenolics

Shoot development of Norway spruce (Picea abies) involves changes in piperidine alkaloids and condensed tannins

Effects of deficiency and overdose of group 2 sigma factors in triple inactivation strains of Synechocystis sp. strain PCC 6803

Alkaloid content of nursery garden seedlings and natural seedlings of Norway spruce (Picea abies)