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Featured researches published by Zaiga Petrina.


International Journal of Environmental Science and Technology | 2015

Microbiological characterization and sterilization-induced changes in the profile of the hydrophobic organic substances in Latvian balneological peat

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

Comparative Study on Bacteria Colonization onto Ceramic Beads Originated from Two Devonian Clay Deposits in Latvia

Olga Muter; Katrina Potapova; Vizma Nikolajeva; Zaiga Petrina; Tatjana Griba; Aloizijs Patmalnieks; Ruta Švinka; Visvaldis Švinka


Zemdirbyste-agriculture | 2011

Impact of six-year-long organic cropping on soil microorganisms and crop disease suppressiveness.

Lelde Grantina; Kristine Kenigsvalde; Daina Eze; Zaiga Petrina; Ilze Skrabule; Nils Rostoks; Vizma Nikolajeva


Ai Magazine | 2012

Antibacterial Activity of Extracts from Some Bryophytes

Vizma Nikolajeva; Ligita Liepina; Zaiga Petrina; Guntra Krumina; Mara Grube; Indrikis Muiznieks


Ai Magazine | 2012

Growth and Antagonism of Trichoderma spp. and Conifer Pathogen Heterobasidion annosum s.l. in Vitro at Different Temperatures

Vizma Nikolajeva; Zaiga Petrina; Livija Vulfa; Laura Alksne; Daina Eze; Lelde Grantina; Talis Gaitnieks; Anita Lielpetere


Archive | 2011

Application Possibilities of Different Expanded Latvian Clay Granules in Biotechnology

Vizma Nikolajeva; Tatjana Griba; Zaiga Petrina


Journal of Autoimmunity | 2000

Treatment of experimental autoimmune encephalomyelitis with adenylate deaminase from Penicillium lanoso-viride.

Vizma Nikolajeva; Daina Eze; Zaiga Petrina; Indrikis Muiznieks


Archive | 2017

BIOMATERIAL FOR TREATMENT OF ACUTE AND CHRONIC SKIN WOUNDS

Anna Ramata-Stunda; Martins Boroduskis; Galina Makarenkova; Zaiga Petrina; Vizma Nikolajeva; Vika Telle; Indrikis Muiznieks; Baiba. Jansone


Journal of Biotechnology | 2016

Comparative efficiency of different biofertilizers applied to the same field

Dagnija Vecstaudza; Maris Senkovs; Solvita Stelmahere; Zaiga Petrina; Galina Makarenkova; Vizma Nikolajeva; Olga Muter


publication.editionName | 2015

Characterisation of a Ceramic Carriers after Wastewater Treatment Process in the Model Column Cascade with Ethanol Addition

Andrejs Berzins; Zaiga Petrina; Vizma Nikolajeva; Ruta Švinka; Visvaldis Švinka; Silvija Straikauska; Olga Muter

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Ruta Švinka

Riga Technical University

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