Search results for "plant physiology"
showing 10 items of 118 documents
Dracocephalum ruyschiana L. (Grants-kalns pie Ogres Kangariem, Rīgas apriņķis)
1895
Nordischer Drachenkopf finden in Livland, Kreis Riga, Hügel, genannt "Grant-kalns" am Oger Kanger zwischen Üxkull und Oger. /// Ruiša pūķgalve, atradne: Livlande, Rīgas apriņķis, tā sautā "Grants-kalns" pie Ogres Kangariem starp Ikšķili un Ogri. /// Northern Dragon-head, deposit: Riga district, hill, called "Grant-kalns" on the Ogres Kangar between Ikskil and Ogre. [Attēls no LU Muzeja kolekcijas Herbarium Balticum (RIG I); (BOT2791_11)]
Dracocephalum ruyschiana L. (Svētezers, Livlande)
2020
Nordischer Drachenkopf. Karl Reinhold Kupffer Anmerkung: Von Herr Raudsep erhalten als bei Heiligensee in Livland gesamellt. Ende des 19., Anfang des 20. Jahrhunderts. /// Ruiša pūķgalve. Uzraksts: no Raudsepa kunga saņemts kā pie Svētezera Livlandē ievākts. 19.gadsimta beigas, 20. gadsimta sākums. /// Northern Dragon-head. Annotation: received from Mr. Raudsepp as collected at Svētezers in Livland.Late 19th century, early 20th century. [Attēls no LU Muzeja kolekcijas Herbarium Balticum (RIG I); (BOT2791_5).]
Dracocephalum ruyschiana L. (Ogres Kangari)
1977
Ruiša pūķgalve, atradne: Ogres rajonā, Ogres Kangaros, granstkarjera A galā priežu meža klajumiņā dienvidrietumu nogāzē, kopā ar Onobrychis, Geranium sanguineum, Filipendula hexapetala, Trifolium montanum (esparsete, asinssarkanā gandrene, lielziedu vīgrieze, kalnu āboliņš). /// Northern Dragon-head, deposit: In Ogre district, Ogres Kangaros, at the eastern end of the gravel quarry in the pine forest clearing on the south-west side, together with Onobrychis, Geranium sanguineum, Filipendula hexapetala, Trifolium montanum. [Attēls no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1029_7)]
Dracocephalum ruyschiana L. (Silciems)
1979
Atradne: Rīgas rajona Silciemā, Allažu mežniecības 14. kvartālā, Silciema-Mežmuižas ceļa kreisajā pusē. Zilā un rozā forma. /// Riga district Silciem, 14 th quarter of the Forestry of Allazi, on the left side of the Silciem-Mezmuiza Road. Blue and pink shapes. // [Attēls no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1029_1)]
Dracocephalum ruyschiana L. (Ļaudona)
1979
Ruiša pūķgalve, atradne: Madonas rajona Ļaudona, 2 km uz dienvidiem priežu mētrājā, stāvas nogāzes augšējā daļā. /// Northern Dragon-head, deposit: Laudon in Madona district, 2 km south in the pine moorland, in the upper part of the steep slope. /// [Attēls no LU Muzeja kolekcijas Herbarium Latvicum (RIG II); (BOT1029_8)]
Photosynthesis and transpiration of healthy and diseased spruce trees in the course of three vegetation periods
1988
CO2- and H2O-gas exchange of 20- to 25-year-old spruce trees from a plantation in the Hunsruck mountains were investigated over a period of 3 years. All measurements were made as pair comparisons, i.e., in each case the gas exchange of a damaged tree and of a relatively healthy tree in its immediate vicinity was measured simultaneously. A second plantation in the Westerwald mountains consisted of 18-year-old apparently healthy spruce trees. Pair comparison at this location meant comparison of two healthylooking trees. The investigations at both locations included diurnal course measurements of photosynthesis and transpiration, and light saturation curves and CO2-saturation curves of photosy…
Pēdējais Pinguicula alpina L. paraugs no Staburaga
1961
LU Muzeja Botānikas un mikoloģiju kolekciju herbārijā glabājas vairāki alpu kreimules herbāriji, kas ievākti gan Igaunijā, gan Latvijā. Auga vienīgā dabiskā augtene Latvijā bija Staburags, kas tika apludināts līdz ar HES būvniecību. Vēlākos gados tā bija atrodama arī Raunas Staburagā. Alpu kreimules paraugi LU Muzejā glabājas Herbarium Latvicum (RIG II), Herbarium Balticum (RIG I), Herbarium Lakshewitzi (RIG III) un Jāņa Ilstera herbārijā. Herbarium Latvicum glabājas pēdējais uz Staburaga Botāniķes Gaidas Ābeles (dz. 1931. gadā) ievāktais paraugs.
Ultrasound-assisted MnO2 catalyzed homolysis of peracetic acid for phenol degradation: The assessment of process chemistry and kinetics
2013
Abstract The combination of peracetic acid (PAA) and heterogeneous catalyst (MnO 2 ) was used for the degradation of phenol in an aqueous solution in the presence of ultrasound irradiation (US). As a relevant source of free radicals (e.g. OH), peracetic acid was comprehensively studied by means of electron spin resonance (ESR) spin trapping (ST) techniques with the subsequent identification of free radicals by simulation based fitting (SBF) technique. The radical reaction mechanism, where hydroxyl radical was a primary product of O O bond rupture of PAA, was established taking into account radical reactions, occurring during sonolysis. The potential barriers and the reaction heat were deter…
Copper homeostasis influences the circadian clock in Arabidopsis.
2010
Almost every aspect of plant physiology is influenced by diurnal and seasonal environmental cycles which suggests that biochemical oscillations must be a pervasive phenomenon in the underlying molecular organization. The circadian clock is entrained by light and temperature cycles, and controls a wide variety of endogenous processes that enable plants to anticipate the daily periodicity of environmental conditions. Several previous reports suggest a connection between copper (Cu) homeostasis and the circadian clock in different organisms other than plants. However, the nature of the Cu homeostasis influence on chronobiology remains elusive. Cytosolic Cu content could oscillate since Cu regu…
Adventitious bud formation on isolated leaves and its significance for mutation breeding
1968
Since a mutation is a unicellular event, irradiation of a multicellular meristem results in the so-called diplontic selection. This competition between the mutated cell and the surrounding non-mutated cells is often lost by the mutated cell, causing a low frequency of mutated plants and a narrow mutation spectrum. When a mutated cell survives, chimeras are automatically formed because most apices consist of a number of fairly independent groups of cell layers. Such an undesirable situation can be improved by growing complete plants from only one cell, resulting in a high frequency of solid, non-chimeral mutants and a wide mutation spectrum. Many plant species can be stimulated to form adven…