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Oral microbiome has significant impact on both oral and general health. Polyols have been promoted as sugar substitutes in prevention of oral diseases. We aimed to reveal the effect of candies containing erythritol, xylitol or control (sorbitol) on salivary microbiome. Ninety children (11.3 ± 0.6 years) consumed candies during 3 years. Microbial communities were profiled using Illumina HiSeq 2000 sequencing and real-time PCR. The dominant phyla in saliva were Firmicutes (39.1%), Proteobacteria (26.1%), Bacteroidetes (14.7%), Actinobacteria (12%) and Fusobacteria (6%). The microbiome of erythritol group significantly differed from that of the other groups. Both erythritol and xylitol reduced the number of observed bacterial phylotypes in comparison to the control group. The relative abundance of the genera Veillonella, Streptococcus and Fusobacterium were higher while that of Bergeyella lower after erythritol intervention when comparing with control. The lowest prevalence of caries-related mutans streptococci corresponded with the lowest clinical caries markers in the erythritol group. Daily consumption of erythritol, xylitol or control candies has a specific influence on the salivary microbiome composition in schoolchildren. Erythritol is associated with the lowest prevalence of caries-related mutans streptococci and the lowest levels of clinical caries experience. ClinicalTrials.gov Identifier NCT01062633.
Jelena Štšepetova; Jaak Truu; Riina Runnel; Rita Nõmmela; Mare Saag; Jana Olak; Hiie Nõlvak; Jens-Konrad Preem; Kristjan Oopkaup; Kaarel Krjutškov; Eino Honkala; Sisko Honkala; Kauko Mäkinen; Pirkko-Liisa Mäkinen; Tero Vahlberg; Joan Vermeiren; Douwina Bosscher; Peter De Cock; Reet Mändar. Impact of polyols on Oral microbiome of Estonian schoolchildren. BMC Oral Health 2019, 19, 1 -10.
AMA StyleJelena Štšepetova, Jaak Truu, Riina Runnel, Rita Nõmmela, Mare Saag, Jana Olak, Hiie Nõlvak, Jens-Konrad Preem, Kristjan Oopkaup, Kaarel Krjutškov, Eino Honkala, Sisko Honkala, Kauko Mäkinen, Pirkko-Liisa Mäkinen, Tero Vahlberg, Joan Vermeiren, Douwina Bosscher, Peter De Cock, Reet Mändar. Impact of polyols on Oral microbiome of Estonian schoolchildren. BMC Oral Health. 2019; 19 (1):1-10.
Chicago/Turabian StyleJelena Štšepetova; Jaak Truu; Riina Runnel; Rita Nõmmela; Mare Saag; Jana Olak; Hiie Nõlvak; Jens-Konrad Preem; Kristjan Oopkaup; Kaarel Krjutškov; Eino Honkala; Sisko Honkala; Kauko Mäkinen; Pirkko-Liisa Mäkinen; Tero Vahlberg; Joan Vermeiren; Douwina Bosscher; Peter De Cock; Reet Mändar. 2019. "Impact of polyols on Oral microbiome of Estonian schoolchildren." BMC Oral Health 19, no. 1: 1-10.
The objectives of this study were to determine the biofilm microbial activity and bacterial community structure and successions in greywater treatment filters and to relate the treatment efficiency to the bacterial community parameters. This 10-month study was performed in a newly established experimental system for domestic greywater treatment that consisted of three parallel vertical flow filters (VFs) followed by a horizontal flow filter (HF). A rapid increase in the bacterial community abundance occurred during the first 85 days of filter operations, followed by a short-term decrease and the stabilization of the 16S rRNA gene copy numbers at average levels of 1.2 × 109 and 3.2 × 108 copies/g dw in VFs and HF, respectively, until the end of the experiment. The dominant bacterial phyla and genera differed between the VFs and HF. The temporal variation in the bacterial community structure was primarily related to the species replacement, and it was significantly affected by the influent organic carbon and nitrogen compounds in the VFs and the ammonia and organic carbon in the HF filters. Despite the differences in the community structure and assembly mechanisms, the temporal dynamics of the bacterial community showed high congruence between the filter types. The treatment efficiency was related to the biofilm bacterial community diversity and abundance and the abundance of certain bacterial genera in the VF filters. The results suggest that the dominant pathway of nitrogen removal by greywater treatment VFs occurs via coupled heterotrophic nitrification and denitrification, while the contribution of aerobic denitrification is temporally variable in these filters.
Marika Truu; Kristjan Oopkaup; Ivo Krustok; Margit Kõiv-Vainik; Hiie Nõlvak; Jaak Truu. Bacterial community activity and dynamics in the biofilm of an experimental hybrid wetland system treating greywater. Environmental Science and Pollution Research 2018, 26, 4013 -4026.
AMA StyleMarika Truu, Kristjan Oopkaup, Ivo Krustok, Margit Kõiv-Vainik, Hiie Nõlvak, Jaak Truu. Bacterial community activity and dynamics in the biofilm of an experimental hybrid wetland system treating greywater. Environmental Science and Pollution Research. 2018; 26 (4):4013-4026.
Chicago/Turabian StyleMarika Truu; Kristjan Oopkaup; Ivo Krustok; Margit Kõiv-Vainik; Hiie Nõlvak; Jaak Truu. 2018. "Bacterial community activity and dynamics in the biofilm of an experimental hybrid wetland system treating greywater." Environmental Science and Pollution Research 26, no. 4: 4013-4026.
Biochar has shown great potential as an amendment to improve soil quality and promote plant growth, as well as to adsorb pollutants from water. However, information about the effect of biochar on the wastewater treatment efficiency in horizontal subsurface flow (HSSF) constructed wetlands (CWs) is still scarce. In this study, we assessed the effect of biochar amendment on the purification efficiency of pretreated municipal wastewater in planted (Typha latifolia) experimental horizontal subsurface flow filters filled with lightweight expanded clay aggregates (LECA). The addition of wood-derived biochar (10% v/v) to LECA significantly increased plant biomass production and enhanced the wastewater treatment efficiency of the planted filters. Both the aboveground plant biomass and belowground plant biomass were higher (1.9- and 1.5-fold, respectively) in the filters of the LBP (LECA + biochar + plants) treatments compared to the LP (LECA + plants) filters. The water pH was significantly lower in the planted filters (LBP < LP < LB-LECA + biochar). The efficiencies of TN and TP removal from wastewater were highest in the LBP filters (20.0% and 22.5%, respectively), followed by the LP (13.7% and 16.2%, respectively) and LB (9.5% and 15.6%, respectively) filters. More N and P were incorporated into the plant biomass from wastewater in the presence of biochar in the filter medium. The study results confirm that biochar can be an advantageous supplement for planted HSSF CWs to enhance the treatment efficiency of these systems.
Kuno Kasak; Jaak Truu; Ivika Ostonen; Jürgen Sarjas; Kristjan Oopkaup; Päärn Paiste; Margit Kõiv-Vainik; Ülo Mander; Marika Truu. Biochar enhances plant growth and nutrient removal in horizontal subsurface flow constructed wetlands. Science of The Total Environment 2018, 639, 67 -74.
AMA StyleKuno Kasak, Jaak Truu, Ivika Ostonen, Jürgen Sarjas, Kristjan Oopkaup, Päärn Paiste, Margit Kõiv-Vainik, Ülo Mander, Marika Truu. Biochar enhances plant growth and nutrient removal in horizontal subsurface flow constructed wetlands. Science of The Total Environment. 2018; 639 ():67-74.
Chicago/Turabian StyleKuno Kasak; Jaak Truu; Ivika Ostonen; Jürgen Sarjas; Kristjan Oopkaup; Päärn Paiste; Margit Kõiv-Vainik; Ülo Mander; Marika Truu. 2018. "Biochar enhances plant growth and nutrient removal in horizontal subsurface flow constructed wetlands." Science of The Total Environment 639, no. : 67-74.
Wastewater treatment systems receiving municipal wastewater are major dissemination nodes of antibiotic resistance genes (ARGs) between anthropogenic and natural environments. This study examined the fate of antibiotic resistome and class 1–3 integron-integrase genes in photobioreactors that were treating municipal wastewater diluted (70/30) with lake or tap water for the algal biomass production. A combined approach of metagenomic and quantitative (qPCR) analysis was undertaken. Municipal wastewater treatment in the photobioreactors led to reduced antibiotic resistome proportion, number of ARG subtypes, and abundances of individual ARGs in the bacterial community. The ARGs and intI1 gene abundances and relative abundances in the discharges of the photobioreactors were either comparable or lower than the respective values in the effluents of conventional wastewater treatment plants. The reduction of the resistome proved to be strongly related to the changes in the bacterial community composition during the wastewater treatment process as it was responding to rising pH levels caused by intense algal growth. Several bacterial genera (e.g., Azoarcus, Dechloromonas, and Sulfuritalea) were recognized as potential hosts of multiple antibiotic resistance types. Although the lake water contributed a diverse and abundant resistome and intI genes profile to the treatment system, it proved to be considerably more beneficial for wastewater dilution than the tap water. The diversity (number of detected resistance types and subtypes) and proportion of the antibiotic resistome, the amount of plasmid borne integron-integrase gene reads, and the abundances and relative abundances of the majority of quantified ARGs (aadA, sul1, tetQ, tetW, qnrS, ermB, blaOXA2-type) and intI1 gene as well as the amount of multi-resistance determinants were significantly lower in the discharges of photobioreactors where lake water was used to dilute wastewater.
Hiie Nõlvak; Marika Truu; Kristjan Oopkaup; Kärt Kanger; Ivo Krustok; Emma Nehrenheim; Jaak Truu. Reduction of antibiotic resistome and integron-integrase genes in laboratory-scale photobioreactors treating municipal wastewater. Water Research 2018, 142, 363 -372.
AMA StyleHiie Nõlvak, Marika Truu, Kristjan Oopkaup, Kärt Kanger, Ivo Krustok, Emma Nehrenheim, Jaak Truu. Reduction of antibiotic resistome and integron-integrase genes in laboratory-scale photobioreactors treating municipal wastewater. Water Research. 2018; 142 ():363-372.
Chicago/Turabian StyleHiie Nõlvak; Marika Truu; Kristjan Oopkaup; Kärt Kanger; Ivo Krustok; Emma Nehrenheim; Jaak Truu. 2018. "Reduction of antibiotic resistome and integron-integrase genes in laboratory-scale photobioreactors treating municipal wastewater." Water Research 142, no. : 363-372.
Tropical peatlands, which play a crucial role in the maintenance of different ecosystem services, are increasingly drained for agriculture, forestry, peat extraction and human settlement purposes. The present study investigated the differences between natural and drained sites of a tropical peatland in the community structure of soil bacteria and archaea and their potential to perform nitrogen transformation processes. The results indicate significant dissimilarities in the structure of soil bacterial and archaeal communities as well as nirK, nirS, nosZ, nifH and archaeal amoA gene-possessing microbial communities. The reduced denitrification and N2-fixing potential was detected in the drained tropical peatland soil. In undisturbed peatland soil, the N2O emission was primarily related to nirS-type denitrifiers and dissimilatory nitrate reduction to ammonium, while the conversion of N2O to N2 was controlled by microbes possessing nosZ clade I genes. The denitrifying microbial community of the drained site differed significantly from the natural site community. The main reducers of N2O were microbes harbouring nosZ clade II genes in the drained site. Additionally, the importance of DNRA process as one of the controlling mechanisms of N2O fluxes in the natural peatlands of the tropics revealed from the results of the study.
Mikk Espenberg; Marika Truu; Ülo Mander; Kuno Kasak; Hiie Nõlvak; Teele Ligi; Kristjan Oopkaup; Martin Maddison; Jaak Truu. Differences in microbial community structure and nitrogen cycling in natural and drained tropical peatland soils. Scientific Reports 2018, 8, 1 -12.
AMA StyleMikk Espenberg, Marika Truu, Ülo Mander, Kuno Kasak, Hiie Nõlvak, Teele Ligi, Kristjan Oopkaup, Martin Maddison, Jaak Truu. Differences in microbial community structure and nitrogen cycling in natural and drained tropical peatland soils. Scientific Reports. 2018; 8 (1):1-12.
Chicago/Turabian StyleMikk Espenberg; Marika Truu; Ülo Mander; Kuno Kasak; Hiie Nõlvak; Teele Ligi; Kristjan Oopkaup; Martin Maddison; Jaak Truu. 2018. "Differences in microbial community structure and nitrogen cycling in natural and drained tropical peatland soils." Scientific Reports 8, no. 1: 1-12.
Dynamics of bacterial community abundance and structure of a newly established horizontal subsurface flow (HSSF) pilot-scale wetland were studied using high-throughput sequencing and quantitative polymerase chain reaction (PCR) methods. Bacterial community abundance increased rapidly within one month and stabilised thereafter in three replicate HSSF constructed wetland (CW) mesocosms. The most dominant phylum was Proteobacteria, followed by Bacteroidetes in wetland media biofilms and Firmicutes in influent wastewater. CW bacterial community diversity increased over time and was positively related to the wastewater treatment efficiency. Increase in the abundance of total bacteria in the community was accompanied with the abundance of denitrifying bacteria that promoted nitrate and nitrite removal from the wastewater. During the 150-day study period, similar patterns of bacterial community successions were observed in replicate HSSF CW mesocosms. The data indicate that successions in the bacterial community in HSSF CW are shaped by biotic interactions, with a significant contribution made by external abiotic factors such as influent chemical parameters. Network analysis of the bacterial community revealed that organic matter and nitrogen removal in HSSF CW could be, in large part, allocated to a small subset of tightly interconnected bacterial species. The diversity of bacterial community and abundance of denitrifiers were good predictors of the removal efficiency of ammonia, nitrate and total organic C in HSSF CW mesocosms, while the removal of the seven-day biochemical oxygen demand (BOD7) was best predicted by the abundance of a small set of bacterial phylotypes. The results suggest that nitrogen removal in HSSF CW consist of two main pathways. The first is heterotrophic nitrification, which is coupled with aerobic denitrification and mediated by mixotrophic nitrite-oxidizers. The second pathway is anaerobic denitrification, which leads to gaseous intermediates and loss of nitrogen as N2.
Kristjan Oopkaup; Marika Truu; Hiie Nõlvak; Teele Ligi; Jens-Konrad Preem; Ülo Mander; Jaak Truu. Dynamics of Bacterial Community Abundance and Structure in Horizontal Subsurface Flow Wetland Mesocosms Treating Municipal Wastewater. Water 2016, 8, 457 .
AMA StyleKristjan Oopkaup, Marika Truu, Hiie Nõlvak, Teele Ligi, Jens-Konrad Preem, Ülo Mander, Jaak Truu. Dynamics of Bacterial Community Abundance and Structure in Horizontal Subsurface Flow Wetland Mesocosms Treating Municipal Wastewater. Water. 2016; 8 (10):457.
Chicago/Turabian StyleKristjan Oopkaup; Marika Truu; Hiie Nõlvak; Teele Ligi; Jens-Konrad Preem; Ülo Mander; Jaak Truu. 2016. "Dynamics of Bacterial Community Abundance and Structure in Horizontal Subsurface Flow Wetland Mesocosms Treating Municipal Wastewater." Water 8, no. 10: 457.
Teele Ligi; Marika Truu; Kristjan Oopkaup; Hiie Nõlvak; Ülo Mander; William Mitsch; Jaak Truu. The genetic potential of N2 emission via denitrification and ANAMMOX from the soils and sediments of a created riverine treatment wetland complex. Ecological Engineering 2015, 80, 181 -190.
AMA StyleTeele Ligi, Marika Truu, Kristjan Oopkaup, Hiie Nõlvak, Ülo Mander, William Mitsch, Jaak Truu. The genetic potential of N2 emission via denitrification and ANAMMOX from the soils and sediments of a created riverine treatment wetland complex. Ecological Engineering. 2015; 80 ():181-190.
Chicago/Turabian StyleTeele Ligi; Marika Truu; Kristjan Oopkaup; Hiie Nõlvak; Ülo Mander; William Mitsch; Jaak Truu. 2015. "The genetic potential of N2 emission via denitrification and ANAMMOX from the soils and sediments of a created riverine treatment wetland complex." Ecological Engineering 80, no. : 181-190.
Teele Ligi; Kristjan Oopkaup; Marika Truu; Jens-Konrad Preem; Hiie Nõlvak; William Mitsch; Ülo Mander; Jaak Truu. Characterization of bacterial communities in soil and sediment of a created riverine wetland complex using high-throughput 16S rRNA amplicon sequencing. Ecological Engineering 2014, 72, 56 -66.
AMA StyleTeele Ligi, Kristjan Oopkaup, Marika Truu, Jens-Konrad Preem, Hiie Nõlvak, William Mitsch, Ülo Mander, Jaak Truu. Characterization of bacterial communities in soil and sediment of a created riverine wetland complex using high-throughput 16S rRNA amplicon sequencing. Ecological Engineering. 2014; 72 ():56-66.
Chicago/Turabian StyleTeele Ligi; Kristjan Oopkaup; Marika Truu; Jens-Konrad Preem; Hiie Nõlvak; William Mitsch; Ülo Mander; Jaak Truu. 2014. "Characterization of bacterial communities in soil and sediment of a created riverine wetland complex using high-throughput 16S rRNA amplicon sequencing." Ecological Engineering 72, no. : 56-66.
Chronic apical periodontitis (CAP) is a frequent condition that has a considerable effect on a patient's quality of life. We aimed to reveal root canal microbial communities in antibiotic-naive patients by applying Illumina sequencing (Illumina Inc, San Diego, CA). Samples were collected under strict aseptic conditions from 12 teeth (5 with primary CAP, 3 with secondary CAP, and 4 with a periapical abscess [PA]) and characterized by profiling the microbial community on the basis of the V6 hypervariable region of the 16S ribosomal RNA gene by using Illumina HiSeq2000 sequencing combinatorial sequence-tagged polymerase chain reaction products. Root canal specimens displayed highly polymicrobial communities in all 3 patient groups. One sample contained 5-8 (mean = 6.5) phyla of bacteria. The most numerous were Firmicutes and Bacteroidetes, but Actinobacteria, Fusobacteria, Proteobacteria, Spirochaetes, Tenericutes, and Synergistetes were also present in most of the patients. One sample contained 30-70 different operational taxonomic units; the mean (± standard deviation) was lower in the primary CAP group (36 ± 4) than in the PA (45 ± 4) and secondary CAP (43 ± 13) groups (P < .05). The communities were individually different, but anaerobic bacteria predominated as the rule. Enterococcus faecalis was found only in patients with secondary CAP. One PA sample displayed a significantly high proportion (47%) of Proteobacteria, mainly at the expense of Janthinobacterium lividum. This study provided an in-depth characterization of the microbiota of periapical tissues, revealing highly polymicrobial communities and minor differences between the study groups. A full understanding of the etiology of periodontal disease will only be possible through further in-depth systems-level analyses of the host-microbiome interaction.
Veiko Vengerfeldt; Katerina Špilka; Mare Saag; Jens-Konrad Preem; Kristjan Oopkaup; Jaak Truu; Reet Mändar. Highly Diverse Microbiota in Dental Root Canals in Cases of Apical Periodontitis (Data of Illumina Sequencing). Journal of Endodontics 2014, 40, 1778 -1783.
AMA StyleVeiko Vengerfeldt, Katerina Špilka, Mare Saag, Jens-Konrad Preem, Kristjan Oopkaup, Jaak Truu, Reet Mändar. Highly Diverse Microbiota in Dental Root Canals in Cases of Apical Periodontitis (Data of Illumina Sequencing). Journal of Endodontics. 2014; 40 (11):1778-1783.
Chicago/Turabian StyleVeiko Vengerfeldt; Katerina Špilka; Mare Saag; Jens-Konrad Preem; Kristjan Oopkaup; Jaak Truu; Reet Mändar. 2014. "Highly Diverse Microbiota in Dental Root Canals in Cases of Apical Periodontitis (Data of Illumina Sequencing)." Journal of Endodontics 40, no. 11: 1778-1783.
The residues from human environments often contain antibiotics and antibiotic resistance genes (ARGs) that can contaminate natural environments; the clearest consequence of that is the selection of antibiotic‐resistant bacteria. The Baltic Sea is the second largest isolated brackish water reservoir on Earth, serving as a drainage area for people in 14 countries, which differ from one another in antibiotic use and sewage treatment policies. The aim of this study was to characterize the bacterioplankton structure and quantify ARGs (tetA, tetB, tetM, ermB, sul1, blaSHV, and ampC) within the bacterioplankton community of the Baltic Sea. Quantitative polymerase chain reaction was applied to quantify ARGs from four different sampling sites of the Baltic Sea over 2 years, and the bacterial communities were profiled sequencing the V6 region of the 16S rRNA gene on Illumina HiSeq2000. The results revealed that all the resistance genes targeted in the study were detectable from the Baltic Sea bacterioplankton. The percentage of tetA, tetB, tetM, ermB, and sul1 genes in the sea bacterial community varied between 0.0077% and 0.1089%, 0.0003% and 0.0019%, 0.0001% and 0.0105%, 0% and 0.0136%, and 0.0001% and 0.0438%, respectively. The most numerous ARG detected was the tetA gene and this gene also had the highest proportion in the whole microbial community. A strong association between bacterioplankton ARGs’ abundance data and community phylogenetic composition was found, implying that the abundance of most of the studied ARGs in the Baltic Sea is determined by fluctuations in its bacterial community structure.
Kertu Tiirik; Hiie Nõlvak; Kristjan Oopkaup; Marika Truu; Jens-Konrad Preem; Ain Heinaru; Jaak Truu. Characterization of the bacterioplankton community and its antibiotic resistance genes in the Baltic Sea. Biotechnology and Applied Biochemistry 2014, 61, 23 -32.
AMA StyleKertu Tiirik, Hiie Nõlvak, Kristjan Oopkaup, Marika Truu, Jens-Konrad Preem, Ain Heinaru, Jaak Truu. Characterization of the bacterioplankton community and its antibiotic resistance genes in the Baltic Sea. Biotechnology and Applied Biochemistry. 2014; 61 (1):23-32.
Chicago/Turabian StyleKertu Tiirik; Hiie Nõlvak; Kristjan Oopkaup; Marika Truu; Jens-Konrad Preem; Ain Heinaru; Jaak Truu. 2014. "Characterization of the bacterioplankton community and its antibiotic resistance genes in the Baltic Sea." Biotechnology and Applied Biochemistry 61, no. 1: 23-32.
Municipal wastewater treatment is one of the pathways by which antibiotic resistance genes from anthropogenic sources are introduced into natural ecosystems. This study examined the abundance and proportion dynamics of seven antibiotic resistance genes in the wetland media biofilm and in the influent and effluent of parallel horizontal subsurface flow mesocosm cells of a newly established hybrid constructed wetland treating municipal wastewater. The targeted genes (tetA, tetB, tetM, ermB, sul1, ampC, and qnrS) encode resistance to major antibiotic classes such as tetracyclines, macrolides, sulfonamides, penicillins, and fluoroquinolones, respectively. All targeted antibiotic resistance genes were detectable in the tested mesocosm environments, with the tetA, sul1, and qnrS genes being the most abundant in the mesocosm effluents. After initial fluctuation in the microbial community, target gene abundances and proportions stabilized in the wetland media biofilm. The abundance of 16S rRNA and antibiotic resistance genes, and the proportion of antibiotic resistance genes in the microbial community, were reduced during the wastewater treatment by the constructed wetland. The concentration of antibiotic resistance genes in the system effluent was similar to conventional wastewater treatment facilities; however, the mesocosms reduced sulfonamide resistance encoding sul1 concentrations more effectively than some traditional wastewater treatment options. The concentrations of antibiotic resistance genes in the wetland media biofilm and in effluent were affected by system operation parameters, especially time and temperature. The results also revealed a relationship between antibiotic resistance genes abundance and the removal efficiencies of NO2-N, NH4-N, and organic matter. Correlation analysis between the abundance of individual antibiotic resistance genes in the mesocosms influent, effluent and wetland media biofilm indicated that depending on antibiotic resistance gene type the microbes carrying these genes interact differently with microbial communities already present on the wetland media.
Hiie Nõlvak; Marika Truu; Kertu Tiirik; Kristjan Oopkaup; Teele Sildvee; Ants Kaasik; Ülo Mander; Jaak Truu. Dynamics of antibiotic resistance genes and their relationships with system treatment efficiency in a horizontal subsurface flow constructed wetland. Science of The Total Environment 2013, 461-462, 636 -644.
AMA StyleHiie Nõlvak, Marika Truu, Kertu Tiirik, Kristjan Oopkaup, Teele Sildvee, Ants Kaasik, Ülo Mander, Jaak Truu. Dynamics of antibiotic resistance genes and their relationships with system treatment efficiency in a horizontal subsurface flow constructed wetland. Science of The Total Environment. 2013; 461-462 ():636-644.
Chicago/Turabian StyleHiie Nõlvak; Marika Truu; Kertu Tiirik; Kristjan Oopkaup; Teele Sildvee; Ants Kaasik; Ülo Mander; Jaak Truu. 2013. "Dynamics of antibiotic resistance genes and their relationships with system treatment efficiency in a horizontal subsurface flow constructed wetland." Science of The Total Environment 461-462, no. : 636-644.
Jens-Konrad Preem; Jaak Truu; Marika Truu; Ülo Mander; Kristjan Oopkaup; Krista Lõhmus; Heljä-Sisko Helmisaari; Veiko Uri; Martin Zobel. Bacterial community structure and its relationship to soil physico-chemical characteristics in alder stands with different management histories. Ecological Engineering 2012, 49, 10 -17.
AMA StyleJens-Konrad Preem, Jaak Truu, Marika Truu, Ülo Mander, Kristjan Oopkaup, Krista Lõhmus, Heljä-Sisko Helmisaari, Veiko Uri, Martin Zobel. Bacterial community structure and its relationship to soil physico-chemical characteristics in alder stands with different management histories. Ecological Engineering. 2012; 49 ():10-17.
Chicago/Turabian StyleJens-Konrad Preem; Jaak Truu; Marika Truu; Ülo Mander; Kristjan Oopkaup; Krista Lõhmus; Heljä-Sisko Helmisaari; Veiko Uri; Martin Zobel. 2012. "Bacterial community structure and its relationship to soil physico-chemical characteristics in alder stands with different management histories." Ecological Engineering 49, no. : 10-17.