Search results for "myrkyt"
showing 5 items of 15 documents
Comparison of machine learning and logistic regression as predictive models for adverse maternal and neonatal outcomes of preeclampsia: A retrospecti…
2022
IntroductionPreeclampsia, one of the leading causes of maternal and fetal morbidity and mortality, demands accurate predictive models for the lack of effective treatment. Predictive models based on machine learning algorithms demonstrate promising potential, while there is a controversial discussion about whether machine learning methods should be recommended preferably, compared to traditional statistical models.MethodsWe employed both logistic regression and six machine learning methods as binary predictive models for a dataset containing 733 women diagnosed with preeclampsia. Participants were grouped by four different pregnancy outcomes. After the imputation of missing values, statistic…
Preconcentration and speciation analysis of mercury : 3D printed metal scavenger-based solid-phase extraction followed by analysis with inductively c…
2021
A selective method for preconcentration and determination of methylmercury (MeHg) and inorganic mercury (iHg) in natural water samples at the ng L−1 level has been developed. The method involves adsorption of Hg species into a 3D printed metal scavenger and sequential elution with acidic thiourea solutions before ICP-MS determination. Experimental parameters affecting the preconcentration of MeHg and iHg such as the sample matrix, effect of the flow rate on adsorption, eluent composition, and elution mode have been studied in detail. The obtained method detection limits, considering the preconcentration factors of 42 and 93, were found to be 0.05 ng L−1 and 0.08 ng L−1 for MeHg and iHg, res…
Biocides in papermaking chemistry
2011
Effects of organic material on the bioavailability, toxicokinetics and toxicity of xenobiotics in freshwater organisms
2001
Pohjoisille ekosysteemeille tyypillinen runsas orgaanisen aineksen määrä joko liuenneena vedessä tai järvien pohjamudassa voi sitoa useita kemiallisia saasteita ja siten vähentää eliöiden altistumista niille sekä siitä syntyviä myös koko ekosysteemille haitallisia vaikutuksia. Anna Nikkilän tutkimuksessa havaittiin, että orgaaninen aines voi vähentää merkittävästi harvasukamadon sekä vesikirpun altistumista tietyille rasvaliukoisille ympäristömyrkyille aromaattisten monirenkaisten hiilivetyjen (pyreeni, reteeni) sekä kloorifenolien (2,4,5-trikloorifenoli, pentakloorifenoli) ryhmistä. Osa tutkituista yhdisteistä sitoutui orgaaniseen ainekseen eikä näin ollut eliöille altistavassa muodossa. V…