Search results for "alkio"
showing 10 items of 18 documents
Influence of warming temperatures on coregonine embryogenesis within and among species
2021
The greatest response of lakes to climate change has been the increase in water temperatures on a global scale. The responses of many lake fishes to warming water temperatures are projected to be inadequate to counter the speed and magnitude of climate change, leaving some species vulnerable to decline and extinction. We experimentally evaluated the responses of embryos from a group of cold, stenothermic fishes (Salmonidae Coregoninae) - within conspecifics across lake systems, between congeners within the same lake system, and among congeners across lake systems - to a thermal gradient using an incubation method that enabled global comparisons. Study groups included cisco (Coregonus artedi…
Alkiolaisuus nykypäivän nuorisoseurakasvatuksessa
2012
Tutkimuksessa selvitetään suomalaisten nuorisoseuratoimijoiden itsensä esittämää kysymystä siitä, toteutuvatko alkiolaiset nuorisoseuraihanteet nykyisessä nuorisoseuratoiminnassa. Ensimmäiset nuorisoseurat hakivat muotoaan 1900-luvun taitteessa, jolloin Santeri Alkio muotoili puuhamiehenä aatteen suuntaviivoja. Alkio pyrki kohottamaan nuorisoseurojen avulla alimpien kansankerrosten nuorison sivistystasoa ja tietoisuutta omasta yhteiskunnallisesta tilastaan. Tätä päämäärää kohti hän lähti kulkemaan nuorisoseuroissa toteutettavan itsekasvatuksen idean avulla. Alkion tuolloin nuorisoseurakasvatukselle asettamat tavoitteet muodostavat tutkimuksen ideologisen pohjan. Tutkielma käsittelee kahta t…
Santeri Alkio Suomen Keskustan aatteellisena fundamenttina : tutkielma Santeri Alkion aseman rakentumisesta maalaisliitto-keskustapuolueessa
2000
Sulfate toxicity to early life stages of European whitefish (Coregonus lavaretus) in soft freshwater
2020
Sulfate occurs naturally in the aquatic environment but its elevated levels can be toxic to aquatic life in freshwater environments. We investigated the toxicity of sulfate in humic, soft freshwater to whitefish (Coregonus lavaretus) from fertilization of eggs to hatching i.e. during the critical phases of whitefish early development. Anadromous Kokemäenjoki whitefish eggs and sperm during fertilization, embryos and larvae were exposed in the long-term 175-day incubation to seven different sodium sulfate (Na2SO4) concentrations from 44 to 2 000 mg SO4 L−1. Endpoint variables were the fertilization success, offspring survival and larval growth. Egg fertilization and early embryonic developmen…
Exposure to retene, fluoranthene, and their binary mixture causes distinct transcriptomic and apical outcomes in rainbow trout (Oncorhynchus mykiss) …
2022
Polycyclic aromatic hydrocarbons (PAHs) are widely spread environmental contaminants which affect developing organisms. It is known that improper activation of the aryl hydrocarbon receptor (AhR) by some PAHs contributes to toxicity, while other PAHs can disrupt cellular membrane function. The exact downstream mechanisms of AhR activation remain unresolved, especially with regard to cardiotoxicity. By exposing newly hatched rainbow trout alevins (Oncorhynchus mykiss) semi-statically to retene (32 µg l−1; AhR agonist), fluoranthene (50 µg l−1; weak AhR agonist and CYP1a inhibitor) and their binary mixture for 1, 3, 7 and 14 days, we aimed to uncover novel mechanisms of cardiotoxicity using a…
Endogenous AhR agonist FICZ accumulates in rainbow trout (Oncorhynchus mykiss) alevins exposed to a mixture of two PAHs, retene and fluoranthene
2022
AbstractMultiple studies have reported synergized toxicity of PAH mixtures in developing fish larvae relative to the additive effect of the components. From a toxicological perspective, multiple mechanisms are known to contribute to synergism, such as altered toxicodynamics and kinetics, as well as increased oxidative stress. An understudied contributor to synergism is the accumulation of endogenous metabolites, for example: the aryl hydrocarbon receptor 2 (AhR2) agonist and tryptophan metabolite 6-Formylindolo(3,2-b)carbazole (FICZ). Fish larvae exposed to FICZ, alongside knock-down of cytochrome p450 (cyp1a), has been reported to induced symptoms of toxicity similar to those observed foll…
Chemical composition and particle size influence the toxicity of nanoscale plastic debris and their co-occurring benzo(α)pyrene in the model aquatic …
2021
Little is known about how particle chemical composition and size might influence the toxicity of nanoscale plastic debris (NPD) and their co-occurring chemicals. Herein, we investigate the toxicity of 3 × 1010 particles/L polyethylene (PE, 50 nm), polypropylene (PP, 50 nm), polystyrene (PS, 200 and 600 nm), and polyvinyl chloride (PVC, 200 nm) NPD and their co-occurring benzo(a)pyrene (BaP) to Daphnia magna and Danio rerio. During the 21 days of exposure to PE 50 nm and PS 200 nm, the number of broods produced by D. magna decreased compared to other treatments. Exposure to BaP alone did not produce any effects on the reproduction of the daphnids, however, the mixture of BaP with PS (200 or …
"Belye lilii" : genezis finskogo mifa v bolgarii, rol' russkogo fennofil'stva, finsko-bolgarskie kontakty i posredniki s konca XIX do konca XX veka
2004
Liilia Siibergin väitöstyössä osoitetaan, miten suomalaisista on kirjallisuuden kautta Bulgariassa tullut sankareita, joita kohtaan tunnetaan erityistä sympatiaa. Samalla suomalaisista sinkoutuu pois kaikki, mikä voisi viitata epätäydellisyyteen. – Emme enää voi puhua stereotypiasta, vaan kyseessä on kansallismyytti, Siiberg toteaa. Bulgarialaisilla ei kuitenkaan ole erityisasemaa suomalaisten mielissä. Väitöskirjassa tarkastellaan Suomen ja Bulgarian välisten kulttuuri- ja kirjallisuussuhteiden syntymistä ja kehitystä sekä tutkitaan kanssakäymisen erityispiirteitä vertailevan kirjallisuustieteen ja kulttuurintutkimuksen näkökulmasta. Siibergin esittämä malli Suomen kansallismyytin syntymis…
Fluence rate or cumulative dose? : Vulnerability of larval northern pike (Esox lucius) to ultraviolet radiation
2007
Newly hatched larvae of northern pike were exposed in the laboratory to four fluence rates of ultraviolet radiation (UVR; 290–400 nm) over three different time periods, resulting in total doses ranging from 3.0 ± 0.2 to 63.0 ± 4.4 kJ·m−2. Mortality and behavior of the larvae were followed for 8–12 days, and growth measured at the end of the experiment. Also, the principle of reciprocity—that the UVR-induced mortality depends on the cumulative dose, independent of fluence rate—was tested. Fluence rates higher than 1480 ± 150 mW·m−2 caused mortality and growth retardation. The highest fluence rate (3040 ± 210 mW·m−2) caused 100% mortality in 5 days. All fluence rates caused behavioral disorde…