Search results for "Gigantea"
showing 10 items of 21 documents
Celmu augstuma ietekmes novērtējums uz sakņu piepes Heterobasidion spp. un lielās pergamentsēnes Phlebiopsis gigantea attīstību maza diametra priežu …
2020
Heterobasidion annosum (Fr.) Bref s.l. sakņu trupe Eiropas Savienībā katru gadu izraisa ievērojamus ekonomiskos zaudējumus – aptuveni 790 milionus eiro. Lai ierobežotu trupes izplatību Latvijā skuju koku celmi diametrā virs 10 cm tiek apstrādāti ar bioloģiskiem preparātiem, kas satur lielās pergamentsēnes Phlebiopsis gigantea sporas. Līdzšinējos pētījumos konstatēts, ka dabiskā P. gigantea nevar efektīvi ierobežot Heterobasidion spp. izplatību. Lai noteiktu Heterobasidion spp. un dabiskās P. gigantea attīstību maza diametra, dažādu augstumu priežu celmos, trīs parauglaukumos analizēti 300 celmi diametrā no 4 līdz 10 cm: puse no tiem 15 cm augsti un puse 50 cm augsti; 120 celmi apstrādāti ar…
DAŽĀDAS IZCELSMES PHLEBIOPSIS GIGANTEA (Fr.) Jül. IZOLĀTU UN TO SUSPENSIJU ATTĪSTĪBA PICEA ABIES (L.) Karst. UN PINUS SYLVESTRIS (L.) KOKSNĒ
2020
Pētījuma mērķis ir noskaidrot Phlebiopsis gigantea izolātu suspensiju maisījumu efektivitāti, pārbaudīt izolātu savstarpējo mijiedarbību egles un priedes koksnē. Darbā izmantotas trīs egles un priedes, kuras sazāģētas 24 bluķīšos, un apstrādātas ar četriem Latvijas izcelsmes P. gigantea izolātiem un sešiem izolātu suspensiju maisījumiem. Bluķīšus mēnesi inkubēja 18⁰C un 50% mitrumā. Pēc tam tie sazāģēti ripās, un analizēts attīstības ātrums un aizņemtais laukums. Veikta reizolācija. Latvijas izcelsmes P. gigantea izolāts PG 182 uzrādīja labākus micēlija augšanas rādītājus gan egles, gan priedes koksnē, salīdzinot ar “Rotstop”, un tas nodrošināja suspensiju maisījumu attīstību. Secināts, ka …
Phlebiopsis gigantea attīstība maza diametra skuju koku celmos
2016
Lai novērtētu P. gigantea micēlija attīstību skuju koku celmos sastāva kopšanas cirtēs, četrās audzēs Vidusdaugavas mežsaimniecībā tika ierīkots eksperiments, kurā ar „Rotstop” un divu Latvijas P. gigantea izolātu konīdijsporu suspensijām apstrādāja maza diametra (3 – 12 cm) parasto egļu un parasto priežu celmus. Pēc gada tika ievākti koksnes paraugi un analizēta P. gigantea attīstība celmos. P. gigantea izolāti labāk attīstījās maza diametra priežu celmos nekā egļu celmos. Dabiskā P. gigantea infekcija konstatēta 20% maza diametra priežu celmu. Salīdzinot „Rotstop” ar vietējiem izolātiem, Latvijas izolāta PG137 attīstības biežums priežu celmos būtiski neatšķīrās un P. gigantea micēlijs sas…
The shell-forming proteome of Lottia gigantea reveals both deep conservations and lineage-specific novelties
2013
19 pages; International audience; Proteins that are occluded within the molluscan shell, the so-called shell matrix proteins (SMPs), are an assemblage of biomolecules attractive to study for several reasons. They increase the fracture resistance of the shell by several orders of magnitude, determine the polymorph of CaCO(3) deposited, and regulate crystal nucleation, growth initiation and termination. In addition, they are thought to control the shell microstructures. Understanding how these proteins have evolved is also likely to provide deep insight into events that supported the diversification and expansion of metazoan life during the Cambrian radiation 543 million years ago. Here, we p…
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).
REFINING ESTIMATES FOR THE SEASON OF SHELLFISH COLLECTION ON THE PACIFIC NORTHWEST COAST: APPLYING HIGH-RESOLUTION STABLE OXYGEN ISOTOPE ANALYSIS AND…
2012
Stable oxygen isotopes from estuarine bivalve carbonate from Saxidomus gigantea were analysed combined with high-resolution sclerochronology from modern and archaeological shells from British Columbia, Canada, to determine the seasonality of shellfish collection from the archaeological site of Namu. The combination of high-resolution sclerochronology and a micro-milled sampling strategy for δ18O analysis permits a precise estimate of archaeological seasonality, because seasonal freshwater influxes and changes in temperature have dual effects on the δ18O value of the shell. Sclerochronological analysis identifies the timing and duration of growth that is temporally aligned to stable oxygen i…
Holocene climate and seasonality of shell collection at the Dundas Islands Group, northern British Columbia, Canada—A bivalve sclerochronological app…
2013
article i nfo To analyze environmental changes and the seasonality of shell collection in British Columbia during the Ho- locene, oxygen isotopes were measured from modern and archeological (1337-7438 cal yr BP) shells of the butter clam Saxidomus gigantea. 1697 discrete isotope samples were taken from two modern and 27 arche- ological shells with a high temporal resolution (sub-seasonal up to daily). Archeological shells were collected from five shell midden sites on the Dundas Islands Group, northern British Columbia, Canada. The oxygen iso- tope data reveal clear annual cycles, with the most positive δ 18 Oshell values occurring during the cold season (slower growth, annual growth line f…
High-resolution sclerochronological analysis of the bivalve mollusk Saxidomus gigantea from Alaska and British Columbia: techniques for revealing env…
2009
Abstract The butter clam, Saxidomus gigantea , is one of the most commonly recovered bivalves from archaeological shell middens on the Pacific Coast of North America. This study presents the results of the sclerochronology of modern specimens of S. gigantea , collected monthly from Pender Island (British Columbia), and additional modern specimens from the Dundas Islands (BC) and Mink and Little Takli Islands (Alaska). The methods presented can be used as a template to interpret local environmental conditions and increase the precision of seasonality estimates in shellfish using sclerochronology and oxygen isotope analysis. This method can also identify, with a high degree of accuracy, the d…
Modulation of copper deficiency responses by diurnal and circadian rhythms in Arabidopsis thaliana
2015
Highlight Cyclic expression of copper transport and the responses to copper deficiency are integrated into the light and circadian–oscillator signalling in plants.
An improved understanding of the Alaska Coastal Current: the application of a bivalve growth-temperature model to reconstruct freshwater-influenced p…
2011
Shells of intertidal bivalve mollusks contain sub-seasonally to interannually resolved records of temperature and salinity variations in coastal settings. Such data are essential to understand changing land-sea interactions through time, specifically atmospheric (precipitation rate, glacial meltwater, river discharge) and oceanographic circulation patterns; however, independent temperature and salinity proxies are currently not available. We established a model for reconstructing daily water temperatures with an average standard error of ∼1.3 °C based on variations in the width of lunar daily growth increments of Saxidomus gigantea from southwestern Alaska, United States. Temperature explai…