0000000000392244
AUTHOR
Mārtiņš Kalniņš
showing 6 related works from this author
Mikroorganismu aktivitātes novērtēšana un stimulēšana eksperimentālajā "Zaļās sienas" sistēmā
2020
Iekštelpu gaisa piesārņojums ir problēma ar ko bieži saskaras gan biroju, gan skolu darbinieki. Lai samazinātu gaisa piesārņojumu telpās tiek lietotas aktīvās gaisa ventilācijas, tomēr pastāv arī savādāki paņēmieni iekštelpu gaisa attīrīšanā. Viens no tādiem paņēmieniem ir “Zaļas sienas” sistēmas. Darba mērķis bija pētīt keramikas granulu, mikroorganismu konsorciju un augu sugu ietekmi uz imobilizēto mikroorganismu aktivitāti. Darbā salīdzināja keramikas granulu, mikroorganismu konsorciju, augu sugu ietekmi uz bioplēvju mikroorganismu koloniju veidojošo vienību skaitu, fluoresceīna diacetāta hidrolīzes, potenciālā amonija oksidācijas un indol-3-etiķskābes sintēzes aktivitāti. Tika novērots,…
Modification of polyoxymethylene for increased thermal resistance
2017
Ternary nanocomposites, composed of polyoxymethylene (POM), ethylene octene copolymer and zinc oxide (ZnO), are prepared by melt compounding. The effects of two types of ethylene-octene copolymers, differing with α-octene content (38% for EOC38 and 17% for EOC17), as well as nanostructured ZnO on thermal behavior of POM are investigated. The content of EOC in the POM based composites is varied between 10 and 50 wt%, while the content of ZnO is 2 wt%. Thermal behavior of POM based systems are studied by using differential scanning calorimetry and thermogravimetric analysis coupled with Fourier transform infrared spectroscopy. Results of thermogravimetric analysis show that, by rising either …
Spāru (Odonata) sugu sastāva izmaiņas, telpiskais sadalījums un to ietekmējošie faktori Latvijā
2012
Elektroniskā versija nesatur pielikumus
Evaluation of Glyphosate Ecotoxicity and Biodegradability in the Municipal Wastewaters
2018
Glyphosate (G) is a broad-spectrum systemic organophosphate herbicide being widely used to control weeds in agricultural fields and urban areas. Its safety for both human health and aquatic biomes is a subject of wide debate. This study was aimed at evaluating the removal efficiency and ecotoxicity of G based herbicide (GBH) Klinik® (Nufarm, Austria) added to the raw municipal wastewater (WW) in a lab-scale model column system. The effect of oxide ceramics as a filtering medium (treatment „B”), as well as activated sludge and nutrients (treatment „C”) was compared with the control columns, which contained only WW (treatment „A”). After 72h treatment of WW spiked with 100 mg/L G, the lowest …
Selective enrichment of heterotrophic nitrifiers <em>Alcaligenaceae</em> and <em>Alcanivorax</em> spp. from industrial wastew…
2020
Removal of nitrogen from wastewaters (WW) represents a global problem. The low nitrification rate during WW treatment is often caused by ecotoxicity. This problem is attributed mostly to the industrial WW. Our study was focused on the testing of industrial WW and activated sludge (AS) with the aim to reveal the abundance of nitrifiers and increase their biomass, thus, providing the additional step, i.e., bioaugmentation, within the technological process of WW treatment. Plating of AS on the selective solidified media designated for the 1st and 2nd nitrification stages, resulted in the shift in bacterial community structure with dominated Alcaligenaceae and Alcanivorax for the 1st stage, and…
Records and Distribution Corrections on Palaearctic Tenebrionoidea (Coleoptera)
2020
Records and faunistic information are provided for 96 Palaearctic species of tenebrionoid beetles of the families Aderidae, Anthicidae, Melandryidae, Mordellidae, Mycetophagidae, Oedemeridae, Prostomidae, Pyrochroidae, Tenebrionidae and Tetratomidae. The first records of Agnathus decoratus Germar, 1818, Cynaeus angustus (Le Conte, 1851), Mordella huetheri Ermisch, 1956 and Prostomis mandibularis (Fabricius, 1801) for the whole Baltic region of Europe are presented.