Johannes Novak

ORCID: 0000-0002-6098-3964
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About
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Research Areas
  • Essential Oils and Antimicrobial Activity
  • Phytochemistry and Biological Activities
  • Natural product bioactivities and synthesis
  • Plant Virus Research Studies
  • Plant biochemistry and biosynthesis
  • Plant and animal studies
  • Genetic diversity and population structure
  • Plant Pathogens and Fungal Diseases
  • Phytochemicals and Antioxidant Activities
  • Sesquiterpenes and Asteraceae Studies
  • Botanical Studies and Applications
  • Flowering Plant Growth and Cultivation
  • Plant Pathogens and Resistance
  • Genomics and Phylogenetic Studies
  • Mycorrhizal Fungi and Plant Interactions
  • Plant Physiology and Cultivation Studies
  • Plant tissue culture and regeneration
  • Fungal Plant Pathogen Control
  • Plant Taxonomy and Phylogenetics
  • Plant Reproductive Biology
  • Medicinal Plant Extracts Effects
  • Fungal Biology and Applications
  • Plant pathogens and resistance mechanisms
  • Ethnobotanical and Medicinal Plants Studies
  • Plant chemical constituents analysis

University of Veterinary Medicine Vienna
2014-2024

University of Vienna
2021

Shihezi University
2014

University of Pisa
2008

Czech Academy of Sciences, Institute of Botany
1983

University of Agriculture Faisalabad
1975-1980

Czech Academy of Sciences, Institute of Experimental Botany
1978

Essential oils from leaves of Lippia multiflora, Mentha x piperita and Ocimum basilicum Burkina Faso were analysed by GC–FID GC–MS. Major components p-cymene, thymol, b-caryophyllene, carvacrol carvone for L. menthol iso-menthone M. and, linalool eugenol O. basilicum. The essential their major monoterpene alcohols tested against nine bacterial strains using the disc diffusion broth microdilution methods. with high phenolic contents most effective antimicrobials. checkerboard method was used...

10.3390/molecules15117825 article EN cc-by Molecules 2010-11-03

Abstract BACKGROUND: Garden sage ( Salvia officinalis L., Lamiaceae) has gained importance during the last decade as a natural antioxidant, mainly owing to antioxidant secondary plant metabolites rosmarinic acid (RA) and diterpenes such carnosic acid. The aim of this work was study biomass production, concentrations total phenolics RA essential oil garden in response phosphorus (P) supply. treatments included P fertilisation inoculation with arbuscular mycorrhizal fungi (AMF), since AMF are...

10.1002/jsfa.3561 article EN Journal of the Science of Food and Agriculture 2009-03-12

Abstract The essential oils of five different cultivars Cannabis sativa contained as main compounds α‐pinene, myrcene, trans ‐β‐ocimene, α‐terpinolene, ‐caryophyllene and α‐humulene. content α‐terpinolene divided the in two distinct groups, an Eastern European group approximately 8% a French around 16%. Therefore, this compound might be suitable genetic marker for breeding centres fibre types . was up to 19%. However, caryophyllene oxide did not exceed 2%. antimicrobial activity oil can...

10.1002/ffj.993 article EN Flavour and Fragrance Journal 2001-05-22

The chemical compositions of the essential oil compounds 117 individual plants belonging to 11 Syrian populations Origanum syriacum L. (Lamiaceae) were studied by GC-FID and GC-MS. composition was dominated carvacrol and/or thymol with a high degree polymorphism in occurrence these two between different populations. In three dominating, being present only minor amounts, whereas one population main compound, traces. all other both as major compounds. No geographical pattern could be detected...

10.1021/jf802963h article EN Journal of Agricultural and Food Chemistry 2009-01-29

Peroxisome proliferator-activated receptors (PPARs) are drug targets for several perturbations of metabolic syndrome, defined as the coexistence obesity, hyperglycemia, hypertension, and hyper/dyslipidemia. In this study, PPAR activation by oregano (e.g., Origanum vulgare) its components was tested. Oregano extracts bind but do not transactivate PPARgamma, binding affinity differs among different extracts. The contain PPARgamma antagonists quercetin, luteolin, rosmarinic acid, diosmetin),...

10.1021/jf802298w article EN Journal of Agricultural and Food Chemistry 2008-11-20

The total phenolic and flavonoid contents 2,2-diphenyl-1-picrylhydrazyl (DPPH) ferric reduction antioxidant power (FRAP) capacities of 19 accessions Salvia officinalis from the sage collection genebank in Gatersleben (Germany) were evaluated. major compounds sage, that is, rosmarinic acid, caffeic carnosol, carnosic quantified by reverse-phase high-performance liquid chromatography. aerial parts different individual plants each accession collected two consecutive years same experimental...

10.1021/jf903993f article EN Journal of Agricultural and Food Chemistry 2010-02-26

In some medicinal plants a specific plant-fungus association, known as arbuscular mycorrhizal (AM) symbiosis, increases the levels of secondary plant metabolites and/or growth. this study, effects three different AM treatments on biomass and sesquiterpenic acid concentrations in two vitro propagated genotypes valerian (Valeriana officinalis L., Valerianaceae) were investigated. Valerenic, acetoxyvalerenic hydroxyvalerenic analyzed rhizome root fractions. Two significantly increased acids...

10.1055/s-0029-1186180 article EN Planta Medica 2009-10-06

Abstract Small‐scale GC headspace analyses combined with SPME sampling of individual oil glands have been used to measure the variation in volatile content and composition within different oregano plants as affected by age, season developmental state. The main monoterpenes found were p ‐cymene, carvacrol their precursor γ ‐terpinene. early preponderance ‐cymene over was reversed progressed this pattern could also be seen at any time plant, from latest leaves produced (low cymene) earliest...

10.1002/pca.780 article EN Phytochemical Analysis 2004-09-01

The Lamiaceae is rich in aromatic plant species. Most of these species produce and store essential oils specialised epidermal oil glands, which are responsible for their specific flavour. Two types glands producing possessing different morphological structure can be found Salvia sclarea: peltate capitate glands. content single from positions on the (corolla, calyx leaf) were sampled using an SPME fibre analysed by gas chromatography order to study variability composition. It was that...

10.1111/j.1438-8677.2008.00053.x article EN Plant Biology 2008-06-11
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