Zaiga Petrina
University of Latvia
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Publication
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International Journal of Environmental Science and Technology | 2015
Anna Ramata-Stunda; Zaiga Petrina; P. Mekss; G. Kizane; B. Silamikele; Indrikis Muiznieks; Vizma Nikolajeva
The abundance and predominant groups of bacteria, filamentous fungi and yeasts have been studied by culture-dependent microbiological methods in peat probes obtained in two Latvian balneotherapy spa sites, Kemeri and Baldone. Unsterilized peat samples from both the sites contained 5.7–8.1 log bacterial colony-forming units (CFU) and 3.0–5.3 log fungal CFU per gram of dry peat. Isolated species belonged to Alpha-, Beta-, and Gamma-Proteobacteria, Actinobacteria, Clostridia, Bacilli and Flavobacteria as well as to filamentous fungi and yeasts. The composition of microbial population of the peat from both sites shared just four micro-organism groups (Bacillus mycoides, Burkholderia cepacia, Streptomyces spp. and Trichoderma spp.) within totally 36 groups identified. No pathogenic bacteria or fungi and no faecal pollution indicators were recovered. Decimal reduction doses for micro-organisms in peat samples and radiation sterilization doses of peat for the gamma and electron beam radiation were determined. The highest radiation resistance was observed for B. mycoides and Aureobasidium sp. Gamma-sitosterol was the most abundant hydrophobic organic compound in both peats according to GC–MS data. All the sterilization procedures increased concentration of alkanes, alcohols, and ketones and decreased the amount of fatty acids. Heat sterilization proved to be more preserving for the peat sterols than the radiation sterilization. It is concluded that the heat and radiation sterilization methods induce different changes of the profile of hydrophobic organic compounds of balneological peats, what may lead to different therapeutic effects at their application.
Archive | 2012
Olga Muter; Katrina Potapova; Vizma Nikolajeva; Zaiga Petrina; Tatjana Griba; Aloizijs Patmalnieks; Ruta Švinka; Visvaldis Švinka
Zemdirbyste-agriculture | 2011
Lelde Grantina; Kristine Kenigsvalde; Daina Eze; Zaiga Petrina; Ilze Skrabule; Nils Rostoks; Vizma Nikolajeva
Ai Magazine | 2012
Vizma Nikolajeva; Ligita Liepina; Zaiga Petrina; Guntra Krumina; Mara Grube; Indrikis Muiznieks
Ai Magazine | 2012
Vizma Nikolajeva; Zaiga Petrina; Livija Vulfa; Laura Alksne; Daina Eze; Lelde Grantina; Talis Gaitnieks; Anita Lielpetere
Archive | 2011
Vizma Nikolajeva; Tatjana Griba; Zaiga Petrina
Journal of Autoimmunity | 2000
Vizma Nikolajeva; Daina Eze; Zaiga Petrina; Indrikis Muiznieks
Archive | 2017
Anna Ramata-Stunda; Martins Boroduskis; Galina Makarenkova; Zaiga Petrina; Vizma Nikolajeva; Vika Telle; Indrikis Muiznieks; Baiba. Jansone
Journal of Biotechnology | 2016
Dagnija Vecstaudza; Maris Senkovs; Solvita Stelmahere; Zaiga Petrina; Galina Makarenkova; Vizma Nikolajeva; Olga Muter
publication.editionName | 2015
Andrejs Berzins; Zaiga Petrina; Vizma Nikolajeva; Ruta Švinka; Visvaldis Švinka; Silvija Straikauska; Olga Muter