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Photochemical Synthesis of Naked Palladium Nanoparticles
Petri Ajo,Johanna Puranen,Harri Nieminen,Erik Vartiainen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.2
Palladium nanoparticles are widely used in catalysis, sensors, coatings and hydrogen storage devices. This paper reports the one-pot photochemical reduction of Pd(II) alcohol solutions into Pd0 nanoparticle suspensions. The synthesis involves the reduction of [PdCl4]2- dissolved in EtOH/2-PrOH mixtures by the ketyl radicals (Me)2(HO)C generated from 254 nm irradiation, in the absence of other chemical reducing agents. Clusters of 10 nm Pd0 particles thus produced could be separated from their suspensions by microfiltration. Preliminary tests are reported on the catalytic potential of such particles for the thermal dehydrogenation of alcohols.
Fernandez-Ayala, Daniel J.M.,Sanz, Alberto,Vartiainen, Suvi,Kemppainen, Kia K.,Babusiak, Marek,Mustalahti, Eero,Costa, Rodolfo,Tuomela, Tea,Zeviani, Massimo,Chung, Jongkyeong,O'Dell, Kevin M.C.,Rustin Elsevier 2009 Cell metabolism Vol.9 No.5
<P><B>Summary</B></P><P>Defects in mitochondrial OXPHOS are associated with diverse and mostly intractable human disorders. The single-subunit alternative oxidase (AOX) found in many eukaryotes, but not in arthropods or vertebrates, offers a potential bypass of the OXPHOS cytochrome chain under conditions of pathological OXPHOS inhibition. We have engineered <I>Ciona intestinalis</I> AOX for conditional expression in <I>Drosophila melanogaster.</I> Ubiquitous AOX expression produced no detrimental phenotype in wild-type flies. However, mitochondrial suspensions from AOX-expressing flies exhibited a significant cyanide-resistant substrate oxidation, and the flies were partially resistant to both cyanide and antimycin. AOX expression was able to complement the semilethality of partial knockdown of both <I>cyclope</I> (COXVIc) and the complex IV assembly factor <I>Surf1</I>. It also rescued the locomotor defect and excess mitochondrial ROS production of flies mutated in <I>dj-1</I>β, a <I>Drosophila</I> homolog of the human Parkinson's disease gene <I>DJ1</I>. AOX appears to offer promise as a wide-spectrum therapeutic tool in OXPHOS disorders.</P>
Katariina Torvinen,Suvi Lehtimäki,Janne T. Keränen,Jenni Sievänen,Jari Vartiainen,Erkki Hellén,Donald Lupo,Sampo Tuukkanen 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.6
Pigment-cellulose nanofibril (PCN) composites were manufactured in a pilot line and used as a separator-substrate in printed graphene and carbon nanotube supercapacitors. The composites consisted typically of 80% pigment and 20% cellulose nanofibrils (CNF). This composition makes them a cost-effective alternative as a substrate for printed electronics at high temperatures that only very special plastic films can nowadays stand. The properties of these substrates can be varied within a relatively large range by the selection of raw materials and their relative proportions. A semiindustrial scale pilot line was successfully used to produce smooth, flexible, and nanoporous composites, and their performance was tested in a double functional separator-substrate element in supercapacitors. The nanostructural carbon films printed on the composite worked simultaneously as high surface area active electrodes and current collectors. Low-cost supercapacitors made from environmentally friendly materials have significant potential for use in flexible, wearable, and disposable low-end products.
Guicheng Zhang,Siew-Kim Khoo,Mika J Mäkelä,Pierre Candelaria,Catherine M Hayden,Leena von Hertzen,Tiina Laatikainen,Erkki Vartiainen,Jack Goldblatt,Tari Haahtela,Peter N LeSouëf1 대한천식알레르기학회 2014 Allergy, Asthma & Immunology Research Vol.6 No.4
Purpose: We investigated maternal genetic effects of four IL-4/IL-13 pathway genes as well as their interactions with the “Western or Easternlifestyles/environments” on IgE in Karelian children. Methods: This study included 609 children and their mothers. Total IgE levels in children andmothers were measured and 10 single nucleotide polymorphisms (SNPs) in IL-4, IL-4Ra, IL-13, and STAT6 were genotyped in mothers and their children. Results: The maternal G allele of IL-13 130 (rs20541) was significantly (P=0.001) associated with decreased IgE in children in the Karelianpopulation (Pooling Finnish and Russian children), as well as in Finnish (P=0.030) and Russian children (P=0.018). The IgE levels were significantly(P=0.001) higher in Russian children whose mothers were homozygous for the G allele of the IL-4Ra 50 (rs1805010) SNP than that in Russian childrenof mothers who were AG heterozygotes or AA homozygotes. After accounting for children’s genotypes, we observed interactive effects on children’sIgE for maternal IL-13 130 genotypes (P=0.014) and maternal IL-4Ra 50 genotypes (P=0.0003) with “Western or Eastern” lifestyles/environments. With the adjustment for multiple comparisons using a false discovery rate (FDR) of 0.05, the interactive effect of the maternal IL-4Ra 50 SNP wassignificant. Conclusion: Maternal genetic variants in IL-4/IL-13 pathway genes, such as IL-13 130 and IL-4Ra50, influenced IgE levels in schoolchildren that were independent of the children’s genetic effects. These effects differ in “Western or Eastern” environments.