Search results for: Janne Jänis

Items from 1 to 20 out of 38 results

article

One ring closer to a closure: the crystal structure of the ES₃ hydroxymethylbilane synthase intermediate

Helene J. Bustad, Marthe S. Christie, Mikko Laitaoja, Aasne K. Aarsand, more

Hydroxymethylbilane synthase (HMBS), involved in haem biosynthesis, catalyses the head‐to‐tail coupling of four porphobilinogens (PBGs) via a dipyrromethane (DPM) cofactor. DPM is composed of two PBGs, and a hexapyrrole is built before the tetrapyrrolic 1‐hydroxymethylbilane product is released. During this elongation, stable enzyme (E) intermediates are formed from the holoenzyme, with additional...

article

Compositional analysis of essential oil and solvent extracts of Norway spruce sprouts by ultrahigh‐resolution mass spectrometry

Omolara O. Mofikoya, Marko Mäkinen, Janne Jänis

Phytochemical Analysis > 33 > 3 > 392 - 401

Introduction Coniferous trees, especially their needles and bark, are a rich source of bioactive compounds. The developing needles of Norway spruce (Picea abies), also known as spruce sprouts, are enriched with vitamin C and other antioxidants, and thus they are used as a dietary supplement and have been traditionally used to treat various inflammatory disorders such as rheumatism and gout. Their...

article

Carbon Budget and Molecular Structure of Natural Organic Matter in Bank Infiltrated Groundwater

Maija Jylhä‐Ollila, Hanne Laine‐Kaulio, Jos Schilder, Paula Niinikoski‐Fuβwinkel, more

Groundwater > 59 > 5 > 644 - 657

Managed aquifer recharge (MAR) provides means to remove natural organic matter (NOM) from surface waters. Recent studies have explored the degree of NOM removal in groundwater. In this study, we further elaborate the NOM removal at a lakeside natural bank infiltration site that functions as a surrogate for MAR. Our objective was to quantify the carbon budget in the aquifer based on concentration measurements...

article

Synthesis of Novel Anti‐inflammatory Psoralen Derivatives ‐ Structures with Distinct Anti‐Inflammatory Activities

Juri M. Timonen, Katriina Vuolteenaho, Tiina Leppänen, Riina M. Nieminen, more

Journal of Heterocyclic Chemistry > 55 > 11 > 2590 - 2597

As a continuum to our work with coumarins, 12 psoralens were synthesized and evaluated for their anti‐inflammatory activity. Psoralens were prepared in three steps; at first, 7‐hydroxycoumarins were synthesized by von Pechmann condensation and then converted to 7‐(2‐oxopropoxy)coumarins. In the final step, a fused furan ring was introduced in an intramolecular ring‐formation reaction. Based on a SciFinder...

article

Heterometallic Cluster‐Capped Tetrahedral Assemblies with Postsynthetic Modification of the Metal Cores

Julia R. Shakirova, Elena V. Grachova, Vladislav V. Gurzhiy, Senthil Kumar Thangaraj, more

Angewandte Chemie > 130 > 43 > 14350 - 14354

Combining the star‐shaped alkynyl ligands with low‐nuclearity gold–copper triphosphane clusters produces 3D metallocage aggregates, which demonstrate room temperature phosphorescence in solution (max Φ_em=0.6). Their luminescence mainly originates from cluster‐localized metal‐to‐ligand charge transfer excited state. These supramolecular assemblies can be easily converted into the isostructural gold‐silver...

article

Heterometallic Cluster‐Capped Tetrahedral Assemblies with Postsynthetic Modification of the Metal Cores

Julia R. Shakirova, Elena V. Grachova, Vladislav V. Gurzhiy, Senthil Kumar Thangaraj, more

Angewandte Chemie International Edition > 57 > 43 > 14154 - 14158

article

An assessment of side-stream generation from Finnish forest industry

Md. Kamrul Hassan, Aki Villa, Suvi Kuittinen, Janne Jänis, more

Journal of Material Cycles and Waste Management > 2019 > 21 > 2 > 265-280

This study examined side-stream generation from Finnish forest industry comprising data from 19 sawmills, 1 plywood mill, 1 particleboard mill, 10 paper and board mills, 1 semi-mechanical mill, and 15 chemical pulp mills. A structured questionnaire survey was carried out for this study. The results revealed that the generation of side stream in sawmills, plywood mills, paper and board mills, mechanical...

article

Progress toward Catalytic Micro‐ and Nanomotors for Biomedical and Environmental Applications

Muhammad Safdar, Shahid Ullah Khan, Janne Jänis

Advanced Materials > 30 > 24 > n/a - n/a

Synthetic micro‐ and nanomotors (MNMs) are tiny objects that can autonomously move under the influence of an appropriate source of energy, such as a chemical fuel, magnetic field, ultrasound, or light. Chemically driven MNMs are composed of or contain certain reactive material(s) that convert chemical energy of a fuel into kinetic energy (motion) of the particles. Several different materials have...

article

Characterization of fast pyrolysis oil from short-rotation willow by high-resolution Fourier transform ion cyclotron resonance mass spectrometry

Ilja Miettinen, Suvi Kuittinen, Ville Paasikallio, Marko Mäkinen, more

Fuel > 2017 > 207 > C > 189-197

Fast pyrolysis oil (FPO) produced from short-rotation willow was characterized by using high-resolution Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry and various bulk chemical analyses. The pyrolysis experiments were carried out on a bench-scale bubbling fluidized bed pyrolysis reactor operating at the temperature of 500°C. The resulting pyrolysis oil was a single-phase liquid...

article

Protection of Platinum‐Based Micromotors from Thiol Toxicity by Using Manganese Oxide

Tam Do Minh, Muhammad Safdar, Janne Jänis

Chemistry – A European Journal > 23 > 34 > 8134 - 8136

Platinum‐based micromotors have shown many exciting applications when functionalized using gold–thiol chemistry. However, thiols are known to bind to the Pt surface, which can lead to serious deactivation of the catalyst. In this paper, it is demonstrated that MnO₂ can be used to protect Pt‐based micromotors prior to the thiol treatment, thus fully avoiding the catalyst poisoning. This approach will...

article

Back Cover: Protection of Platinum‐Based Micromotors from Thiol Toxicity by Using Manganese Oxide (Chem. Eur. J. 34/2017)

Tam Do Minh, Muhammad Safdar, Janne Jänis

Chemistry – A European Journal > 23 > 34 > 8321 - 8321

Keep it moving: A proof‐of‐concept solution for the protection of Pt‐based micromotors against thiol‐induced deactivation, which limits their functionalization by gold–thiol chemistry for a variety of applications, is proposed. Thiols are known to bind to the Pt surface, which can lead to serious deactivation of the catalyst. The inner catalytic surface of the electrochemically fabricated Au/Pt micromotors...

article

Deciphering metal ion preference and primary coordination sphere robustness of a designed zinc finger with high‐resolution mass spectrometry

Mikko Laitaoja, Sari Isoniemi, Jarkko Valjakka, István M. Mándity, more

Protein Science > 26 > 2 > 198 - 207

Small zinc finger (ZnF) motifs are promising molecular scaffolds for protein design owing to their structural robustness and versatility. Moreover, their characterization provides important insights into protein folding in general. ZnF motifs usually possess an exceptional specificity and high affinity towards Zn(II) ion to drive folding. While the Zn(II) ion is canonically coordinated by two cysteine...

article

Redox‐dependent disulfide bond formation in SAP30L corepressor protein: Implications for structure and function

Mikko Laitaoja, Helena Tossavainen, Tero Pihlajamaa, Jarkko Valjakka, more

Protein Science > 25 > 3 > 572 - 586

Sin3A‐associated protein 30‐like (SAP30L) is one of the key proteins in a multi‐subunit protein complex involved in transcriptional regulation via histone deacetylation. SAP30L, together with a highly homologous SAP30 as well as other SAP proteins (i.e., SAP25, SAP45, SAP130, and SAP180), is an essential component of the Sin3A corepressor complex, although its actual role has remained elusive. SAP30L...

article

Dual Effect of Manganese Oxide Micromotors: Catalytic Degradation and Adsorptive Bubble Separation of Organic Pollutants

Owies M. Wani, Muhammad Safdar, Niko Kinnunen, Janne Jänis

Chemistry – A European Journal > 22 > 4 > 1244 - 1247

Manganese oxide (MnO₂) based micromotors exhibiting a dual effect, that is, catalytic degradation and adsorptive bubble separation, were employed for water remediation. The dual effect of MnO₂ microparticles led to a greater than 90 % of decolorization of non‐biodegradable organic dyes in just 1 h, without the need for external agitation or bubble generation. These findings suggest high potential...

article

Rhenium(I) Complexes with Alkynylphosphane Ligands: Structural, Photophysical, and Theoretical Studies

Ilya Kondrasenko, Kristina S. Kisel, Antti J. Karttunen, Janne Jänis, more

European Journal of Inorganic Chemistry > 2015 > 5 > 864 - 875

A family of mono‐ and bidentate alkynylphosphanes has been used for the preparation of the rhenium(I) phenanthroline complexes [Re(phen)(CO)₂(L)₂]⁺ (L = monophosphane), [{Re(phen)(CO)₃}₂(L)]²⁺ (L = diphosphane), and [{Re(phen)(CO)₂}₂(L)₂]²⁺ (L = diphosphane). The dicarbonyl compounds display intense luminescence at 298 K both in solution and in the solid state (Φ_em ≤ 44 %). The tricarbonyl complexes...

article

A New Subtilase-Like Protease Deriving from Fusarium equiseti with High Potential for Industrial Applications

Kari Juntunen, Susanna Mäkinen, Sari Isoniemi, Leena Valtakari, more

Applied Biochemistry and Biotechnology > 2015 > 177 > 2 > 407-430

A gene encoding a novel extracellular subtilisin-like protease was cloned from the ascomycete Fusarium equiseti and expressed in Trichoderma reesei. The F. equiseti protease (Fe protease) showed excellent performance in stain removal and good compatibility with several commercial laundry detergent formulations, suggesting that it has high potential for use in various industrial applications. The recombinant...

article

Microscale immobilized enzyme reactors in proteomics: Latest developments

Muhammad Safdar, Jens Sproß, Janne Jänis

Journal of Chromatography A > 2014 > 1324 > Complete > 1-10

Enzymatic digestion of proteins is one of the key steps in proteomic analyses. There has been a steady progress in the applied digestion protocols in the past, starting from conventional time-consuming in-solution or in-gel digestion protocols to rapid and efficient methods utilizing different types of microscale enzyme reactors. Application of such microreactors has been proven beneficial due to...

article

Microscale enzyme reactors comprising gold nanoparticles with immobilized trypsin for efficient protein digestion

Muhammad Safdar, Jens Sproß, Janne Jänis

Journal of Mass Spectrometry > 48 > 12 > 1281 - 1284

article

Low‐energy collision‐induced dissociation tandem mass spectrometry of 7‐acetonyloxycoumarins

Juri Timonen, Ritva Romppanen, Paula Aulaskari, Janne Jänis

Rapid Communications in Mass Spectrometry > 27 > 23 > 2665 - 2675

RATIONALECoumarins are naturally occurring, oxygen‐containing heterocycles with considerable pharmaceutical potential. For structural elucidation of natural or synthetic coumarins, tandem mass spectrometry (MSⁿ) represents an essential tool. In this study, fragmentation characteristics of twenty‐two 7‐acetonyloxycoumarins, having promising anti‐inflammatory properties, were investigated with low‐energy...

article

Ferrocenyl‐Functionalized Tetranuclear Gold(I) and Gold(I)–Copper(I) Complexes Based on Tridentate Phosphanes

Thuy Minh Dau, Julia R. Shakirova, Antonio Doménech, Janne Jänis, more

European Journal of Inorganic Chemistry > 2013 > 28 > 4976 - 4983

Tetranuclear Au^I–Fe^II dimetallic and Au^I–Cu^I–Fe^II trimetallic complexes bearing ferrocenyl (Fc) groups have been assembled by using two triphosphane ligands, namely, (PPh₂CH₂)₂PPh (dpmp) and (PPh₂)₃CH (tppm). The compositions and structural type of the clusters are dependent on the stereochemistry of the P donor ligands. The complexes [tppmAu₃Cu(C₂R)₃]PF₆ [R = Fc (1) and 4‐C₆H₄‐Fc (2)] adopt a trigonal...

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INFONA - science communication portal

Search results for: Janne Jänis

One ring closer to a closure: the crystal structure of the ES₃ hydroxymethylbilane synthase intermediate

Compositional analysis of essential oil and solvent extracts of Norway spruce sprouts by ultrahigh‐resolution mass spectrometry

Carbon Budget and Molecular Structure of Natural Organic Matter in Bank Infiltrated Groundwater

Synthesis of Novel Anti‐inflammatory Psoralen Derivatives ‐ Structures with Distinct Anti‐Inflammatory Activities

Heterometallic Cluster‐Capped Tetrahedral Assemblies with Postsynthetic Modification of the Metal Cores

Heterometallic Cluster‐Capped Tetrahedral Assemblies with Postsynthetic Modification of the Metal Cores

An assessment of side-stream generation from Finnish forest industry

Progress toward Catalytic Micro‐ and Nanomotors for Biomedical and Environmental Applications

Characterization of fast pyrolysis oil from short-rotation willow by high-resolution Fourier transform ion cyclotron resonance mass spectrometry

Protection of Platinum‐Based Micromotors from Thiol Toxicity by Using Manganese Oxide

Back Cover: Protection of Platinum‐Based Micromotors from Thiol Toxicity by Using Manganese Oxide (Chem. Eur. J. 34/2017)

Deciphering metal ion preference and primary coordination sphere robustness of a designed zinc finger with high‐resolution mass spectrometry

Redox‐dependent disulfide bond formation in SAP30L corepressor protein: Implications for structure and function

Dual Effect of Manganese Oxide Micromotors: Catalytic Degradation and Adsorptive Bubble Separation of Organic Pollutants

Rhenium(I) Complexes with Alkynylphosphane Ligands: Structural, Photophysical, and Theoretical Studies

A New Subtilase-Like Protease Deriving from Fusarium equiseti with High Potential for Industrial Applications

Microscale immobilized enzyme reactors in proteomics: Latest developments

Microscale enzyme reactors comprising gold nanoparticles with immobilized trypsin for efficient protein digestion

Low‐energy collision‐induced dissociation tandem mass spectrometry of 7‐acetonyloxycoumarins

Ferrocenyl‐Functionalized Tetranuclear Gold(I) and Gold(I)–Copper(I) Complexes Based on Tridentate Phosphanes

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