Search results for "ISUM"
showing 10 items of 200 documents
Iekaisuma marķieru loma keratokonusa patoģenēzē
2018
Ievads: Keratokonuss ir ektātiskā radzenes slimība, kura izraisa radzenes slāņu deģenerāciju, progresējošu radzenes biezuma samazināšanos, izveidojot konusveidīgu radzenes formu, provocējot astigmātisma attīstību un redzes pasliktināšanos. Šī slimība jau ir zināma vismaz 270 gadus, bet joprojām nav zināms konkrēts etioloģiskais faktors, tāpēc 20 gadu laikā, pētot keratokonusa patoģenēzi, tika izvirzīti vairāki iespējamie riska faktori un viens no pēdējiem ir pastāvīga acu berzēšana, kas varētu provocēt iekaisuma marķieru pastiprinātu izdalīšanos asaru šķidrumā. Pēdējo 10 gadu laikā oftalmoloģijas laukā tā ir viena no aktuālākajām pētāmajām problēmām, jo tradicionāli keratokonusu uzskatīja p…
Zvaigžņotā debess: 2020, Rudens (249)
2020
Zvaigžņotā Debess: 2019, Pavasaris (243)
2019
Zvaigžņotā Debess: 2010/11, Ziema (210)
2010
Contents: “ZVAIGŅOTĀ DEBESS” FORTY YEARS AGO: Bursting Stars. J. Francman (abridged). Geodesists Help Renew the Spire of St. Peter’s Church. J. Klētnieks (abridged). DEVELOPMENTS in SCIENCE: The Solar Neutrino Problem. O. Smirnova. NEWS: At Last the Planet at the Star β Pictoris Is Imaged. A. Alksnis, Z. Alksne. SPACE RESEARCH and EXPLORATION: The Trail of an Asteroid Reveals a Recent Collision. A. Alksnis. INTERNATIONAL YEAR of ASTRONOMY 2009: International Year of Astronomy 2009 in Philately. The Rest of the World except Series EUROPA (concluded). J. Limansky. ACADEMIC STAFF of the UNIVERSITY of LATVIA: Assistant Professor in Physics Ojārs Šmits (24.04.1930.-14.03.1993.) of the Latvian Un…
Vaccinium spp. ogu izspiedu ekstraktu pretiekaisuma īpašības
2020
Ilgstošs iekaisums ir būtisks faktors hronisku slimību attīstībā, taču vēl joprojām nav pieejami pilnībā droši pretiekaisuma līdzekļi, tādēļ pasaulē pieaug interese par dabīgas izcelsmes savienojumiem ar pretiekaisuma īpašībām. Vaccinium ģints ogas pazīstamas ar augstu bioloģisko aktivitāti un labvēlīgu ietekmi uz cilvēku veselību, pateicoties augstam polifenolu saturam. Šobrīd ogu izspiedas tiek pētītas kā alternatīvs fitoķīmisko savienojumu avots ar veselību veicinošu potenciālu. Darba mērķis ir izpētīt piecu Vaccinium spp. ogu izspiedu ekstraktu pretiekaisuma īpašības, izmantojot lipoksigenāzes (5-LOX), ciklooksigenāzes (COX-1) un ksantīna oksidāzes inhibitoru skrīninga testus. Melleņu, …
Serratia symbiotica from the aphid Cinara cedri: a missing link from facultative to obligate insect endosymbiont.
2011
The genome sequencing of Buchnera aphidicola BCc from the aphid Cinara cedri, which is the smallest known Buchnera genome, revealed that this bacterium had lost its symbiotic role, as it was not able to synthesize tryptophan and riboflavin. Moreover, the biosynthesis of tryptophan is shared with the endosymbiont Serratia symbiotica SCc, which coexists with B. aphidicola in this aphid. The whole-genome sequencing of S. symbiotica SCc reveals an endosymbiont in a stage of genome reduction that is closer to an obligate endosymbiont, such as B. aphidicola from Acyrthosiphon pisum, than to another S. symbiotica, which is a facultative endosymbiont in this aphid, and presents much less gene decay…
SUSTAINABLE AGRICULTURE MANAGEMENTS TO CONTROL SOIL EROSION
2021
[EN] High rates of soil erosion compromise sustainable agriculture. In rainfed agricultural fields, erosion rates several orders of magnitude higher than the erosion rates considered tolerable have been quantified. In Mediterranean rainfed crops such as vineyards, almonds and olive groves, and in the new sloping citrus and persimmon plantations, the rates of soil loss make it necessary to apply measures to reduce them to avoid collapse in agricultural production. Managements such as weeds, catch crops and mulches (straw and pruning remains) are viable options to achieve sustainability. This work applies measurements through plots, simulated rainfall experiments and ISUM (Improved Stock-Unea…
Characterisation, analysis of expression and localisation of the opsin gene repertoire from the perspective of photoperiodism in the aphid Acyrthosip…
2017
Organisms exhibit a wide range of seasonal responses as adaptions to predictable annual changes in their environment. These changes are originally caused by the effect of the Earth's cycles around the sun and its axial tilt. Examples of seasonal responses include floration, migration, reproduction and diapause. In temperate climate zones, the most robust variable to predict seasons is the length of the day (i.e. the photoperiod). The first step to trigger photoperiodic driven responses involves measuring the duration of the light-dark phases, but the molecular clockwork performing this task is poorly characterized. Photopigments such as opsins are known to participate in light perception, b…
Cadmium accumulation and buffering of cadmium-induced stress by arbuscular mycorrhiza in three Pisum sativum L. genotypes
2002
The role of arbuscular mycorrhiza in reducing Cd stress was investigated in three genotypes of Pisum sativum L. (cv. Frisson, VIR4788, VIR7128), grown in soil/sand pot cultures in the presence and absence of 2-3 mg kg(-1) bioavailable Cd, and inoculated or not with the arbuscular mycorrhizal fungus Glomus intraradices. Shoot, root and pod biomass were decreased by Cd in non-mycorrhizal plants. The presence of mycorrhiza attenuated the negative effect of Cd so that shoot biomass and activity of photosystem II, based on chlorophyll a fluorescence, were not significantly different between mycorrhizal plants growing in the presence or absence of the heavy metal (HM). Total P concentrations were…
Zvaigžņotā Debess: 2000, Rudens (169)
2000
Contents: M.Zepe. Water Steam in the Venus Atmosphere ; B.Sala, L.Kondraševa. Use of Solar Energy ; A.Balklavs. Century Long Astrophysics ; Z.Alksne, A.Alksnis. Plenty of Extrasolar Planets ; Z.Alksne, A.Alksnis. Unexpected Discovery of Spiral Structure in a Dwarf Elliptical Galaxy ; A.Balklavs. Hunting for the Black Holes ; J.Jaunbergs. Private Enterprise on Mir ; T.Czarnik. Surviving Explosive Decompression ; M.Gills. Space Research 40 Years Ago – Chronicle ; M.Krastiņš. Impressions about Rose Center for the Earth and Space ; K.Bērziņš. On Friendly Terms with Cosmology: Basic Principles and Models of the Universe (continuation) ; V.Flerov, A.Cēbers, D.Docenko, V.Kaščejev. Latvia 24th Open…