Search results for "SITE"

The S … Hal and Se … Hal chalcogen bonding in a series of thiourea, selenourea and their derivatives

2021

The chalcogen bonding (ChB) in a series of thiourea, selenourea and their derivatives has been investigated in the present paper. Thus, selenourea and dimethylselenourea undergo dimerization and trimerization processes in the presence of various halogen species (1–5). Selenourea and dimethylselenourea form trimers 3–4 in the presence of lighter halogens (chlorine and bromine) through Se⋯Se chalcogen bonding. When moving to heavier halogen (iodine), the dimers 1–2 are formed. Thiourea and its derivatives also tend to make very strong S⋯S bonds and form dimers in the case of lighter halogens chlorine and bromine (compounds 6–7). However, the monomers separated by the iodine species are formed…

Tetracyclic silaheterocycle formed through a pericyclic reaction cascade including a two-fold intramolecular C–C bond activation

2022

Reductive debromination of the tribromoamidosilane 2 gave the tetracyclic silaheterocycle 3 through a unique reaction cascade involving unprecedented two-fold intramolecular cycloaddition by transient silylenes. Experimental and computational analyses of the reaction mechanism allowed the identification of the key intermediates that lead to the silaheterocycle 3 or, alternatively, to the cyclotrisilene 19. peerReviewed

Luokanopettajaopiskelijoiden lajintuntemustaidot sekä asenteet ja valmiudet opettaa lajintuntemusta

2016

Varsinaisena luonnontieteenä biologian ymmärtämisen keskiössä on lajien tuntemus, sillä se avaa ovia lukuisille biologian keskeisille osa-alueille, kuten ekologiaan ja evoluutiobiologiaan. Lajien tuntemus auttaa ymmärtämään biodiversiteetin eli luonnon monimuotoisuuden eri puolia, lajien evolutiivista historiaa ja kehitystä, ja ennen kaikkea kestävän kehityksen periaatteita ja tavoitteita säilyttää luonto ennallaan tuleville sukupolville. Lajintuntemuksessa on kyse paitsi yleissivistyksestä, myös yhteydestä luontoon ja luonnon monimuotoisuuden arvostuksesta. Tämän tutkimuksen tavoitteena oli tutkia Jyväskylän yliopiston Opettajankoulutuslaitoksen luokanopettajaopiskelijoiden lajintuntemusta…

Interdisciplinary Perspectives on Planetary Well-Being

2024

This book proposes a paradigm shift in how human and nonhuman well-being are perceived and approached. In response to years of accelerated decline in the health of ecosystems and their inhabitants, this edited collection presents planetary well-being as a new cross-disciplinary concept to foster global transformation towards a more equal and inclusive framing of well-being. Throughout this edited volume, researchers across the humanities, social sciences, and natural sciences apply and reflect on the concept of planetary well-being, showcasing its value as an interdisciplinary, cross-sectoral changemaker. The book explores the significance of planetary well-being as a theoretical and empiri…

On effective biodiversity conservation, sustainability of bioeconomy, and honesty of the Finnish forest policy

2017

Täydentävien hoitomuotojen toimiala yrittäjyyden viitekehyksessä

2000

Yritysten ja kuluttajien osallistuminen biodiversiteetin suojeluun : tavoitteet, esteet ja ehdot

2022

Halloysite Nanotubes Coated by Chitosan for the Controlled Release of Khellin

2020

In this work, we have developed a novel strategy to prepare hybrid nanostructures with controlled release properties towards khellin by exploiting the electrostatic interactions between chitosan and halloysite nanotubes (HNT). Firstly, khellin was loaded into the HNT lumen by the vacuum-assisted procedure. The drug confinement within the halloysite cavity has been proved by water contact angle experiments on the HNT/khellin tablets. Therefore, the loaded nanotubes were coated with chitosan as a consequence of the attractions between the cationic biopolymer and the halloysite outer surface, which is negatively charged in a wide pH range. The effect of the ionic strength of the aqueous medium…

Kaipuu taittoon

2020

Tribological properties of thin films made by atomic layer deposition sliding against silicon

2018

Interfacial phenomena, such as adhesion, friction, and wear, can dominate the performance and reliability of microelectromechanical (MEMS) devices. Here, thin films made by atomic layer deposition (ALD) were tested for their tribological properties. Tribological tests were carried out with silicon counterpart sliding against ALD thin films in order to simulate the contacts occurring in the MEMS devices. The counterpart was sliding in a linear reciprocating motion against the ALD films with the total sliding distances of 5 and 20 m. Al2O3 and TiO2 coatings with different deposition temperatures were investigated in addition to Al2O3-TiO2-nanolaminate, TiN, NbN, TiAlCN, a-C:H [diamondlike car…