Search results for "Plant physiology"
showing 10 items of 118 documents
Herbicidal derivatives of aminomethylenebisphosphonic acid. Part III. Structure-activity relationship.
1997
Derivatives of aminomethylenebisphosphonic acids constitute a class of promising herbicides. More than 40 N-substituted aminomethylenephosphonic acids were synthesized and evaluated for their herbicidal activity on common cress (Lepidium sativum L.) and cucumber (Cucumis sativus L.). Some of the tested compounds were found to exhibit strong herbicidal properties being equal in activity with the popular herbicide glyphosate as well as parent N-pyridylaminomethylenephosphonic acids. N-Substituted iminodi(methylenephosphonic) acids, which may be considered as close analog of glyphosate, were inactive toward test plants.
Helēnas Ledus - Starcas herbāriji
2022
Raksts par Helēnas Ledus-Starcas (1915 – 2005) herbārijiem Herbarium Latvicum (RIG II), kas glabājas Latvjas Universitātes Muzeja Botānikas un mikoloģijas kolekcijās.
Senākais Pinguicula alpina L. paraugs Latvijā
1867
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 senākais zināmais alpu kreimules paraugs, kas ievākts 1867. gadā.
Coprinus dunarum (Dünen-Tintling) in Dünamünde Pastorat Wanderdüne bei Langesciem mit Korrespondenz
1929
Zeichnung von Dünen-Tintling und Korrespondenz zwischen F. E. Stoll und K. R. Kupfer (Rigaer Gesellschaft der Naturforscher): "Ein von mir das Wanderdüne bei Langesciem entdeckten, das Wissenschaft nochunbekanter Pilz, das in das von den Deutchen Geseltschaft für Pilzen herrausgegeben "Zeitschrift für Pilzen" beschreiben in einer Farbentahfel und zwei Schvartafeln abgebildetun damit das Wissenschaftlische Weltbekant gegeben werden soll. Die reprodukktieres Karten stellen sich auf ca 400 Lat,.... F. E. Stoll. Riga, im April 1929 - Der Naturforscher-Verein zu Riga hat für dem vorstehen den Zeck 100 Lat bewilligt sintern der Voraussetzung, das die erwähnten Tafeln asicht im "Korresponenzblatte…
Changes in the protein profile of Quercus ilex leaves in response to drought stress and recovery
2009
To characterize the molecular response of holm oak to drought stress and its capacity to recover 9-month-old Quercus ilex seedlings were subjected to three treatments for a 14-d period: (i) continuous watering to field capacity (control plants, W), (ii) no irrigation (drought treatment, D), and (iii) no irrigation for 7d followed by a watering period of 7d (recovery treatment, R). In drought plants, leaf water potential decreased from -0.72 (day 0) to -0.99MPa (day 7), and -1.50MPa (day 14). Shoot relative water content decreased from 49.3% (day 0) to 47.7% (day 7) and 40.8% (day 14). Photosystem II quantum yield decreased from 0.80 (day 0) to 0.72 (day 7) and 0.73 (day 14). Plants subjecte…
Coprinus dunarum (Dünen-Tintling) in Dünamünde Pastorat Wanderdüne bei Langesciem
1925
Attēlos redzami sēnes zīmējumi un apraksts zīmējuma otrā pusē.
Milzu apaļpūpēdis 103 cm apkārtmērā
2019
On September 2nd, 1922, the 103 cm in circumference giant puffball fungus was found in the park of the Rīgas Sarkankalna vājprātīgo iestāde. Nowadays it is in the Botany and Mycology collections of the Museum of the University of Latvia. The article provides information on finding and sending the fungus to the University of Latvia, as well as a description of the species of the giant puffball (Calvatia gigantea).
Degradation of Carotenoids in Apricot (Prunus armeniaca L.) During Drying Process
2013
"Carotenoids are natural compounds whose nutritional importance comes from the provitamin A activity of some of them and their protection against several serious human disorders. The degradation of carotenoids was investigated during apricot drying by microwave and convective hot-air at 60 and 70 A degrees C. Seven carotenoids were identified: antheraxanthin, lutein, zeaxanthin, beta-cryptoxanthin, 13-cis-beta-carotene, all-trans-beta-carotene and 9-cis-beta-carotene; among these, all-trans-beta-carotene was found to be about 50 % of total carotenoids. First-order kinetic models were found to better describe all-trans-beta-carotene reduction during drying, with a degradation rate constant (…
Aminopropyltransferases involved in polyamine biosynthesis localize preferentially in the nucleus of plant cells
2012
Plant aminopropyltransferases consist of a group of enzymes that transfer aminopropyl groups derived from decarboxylated S-adenosyl-methionine (dcAdoMet or dcSAM) to propylamine acceptors to produce polyamines, ubiquitous metabolites with positive charge at physiological pH. Spermidine synthase (SPDS) uses putrescine as amino acceptor to form spermidine, whereas spermine synthase (SPMS) and thermospermine synthase (TSPMS) use spermidine as acceptor to synthesize the isomers spermine and thermospermine respectively. In previous work it was shown that both SPDS1 and SPDS2 can physically interact with SPMS although no data concerning the subcellular localization was reported. Here we study the…
Viola canina × uliginosa herbārijs no Moricsalas
1909
Paula Lakševica (Lackschewitz; 1865 – 1936) Moricsalā ievāktais vijolītes Viola canina × uliginosa herbārijs glabājas Herbarium Latvicum (RIG II) kolekcijā Latvijas Universitātes Muzeja Botānikas un mikoloģijas kolekcijās. Herbārijs ir ievākts, veicot sākotnējo salas floras izpēti, kurā piedalījās vairāki Baltijas dabaspētnieki. Izpētes rezultāti kalpoja par pamatu, Moricsalas dabas rezervāta izveidei.