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Université de Fribourg

Surface modifications of positive-electrode materials for lithium ion batteries

Kwon, Nam Hee ; Conder, Joanna ; Srout, Mohammed ; Fromm, Katharina M.

In: CHIMIA International Journal for Chemistry, 2019, vol. 73, no. 11, p. 880–893

Lithium ion batteries are typically based on one of three positive-electrode materials, namely layered oxides, olivine- and spinel-type materials. The structure of any of them is 'resistant' to electrochemical cycling, and thus, often requires modification/post- treatment to improve a certain property, for example, structural stability, ionic and/or electronic conductivity. This review...

Université de Fribourg

New Ni0.5Ti2 (PO4)3@C NASICON-type electrode material with high rate capability performance for lithium-ion batteries: Synthesis and electrochemical properties

Srout, Mohammed ; Kwon, Nam Hee ; Luo, Wen ; Züttel, Andreas ; Fromm, Katharina M. ; Saadoune, Ismael

In: ChemSusChem, 2019, vol. 12, no. 21, p. 4846–4853

Ni0.5Ti2(PO4)3/C NASICON‐type phosphate is introduced as a new anode material for lithium‐ion batteries (LIBs). Ni0.5Ti2(PO4)3/C was synthesized through the sol–gel route and delivered some remarkable electrochemical performances. Specifically, the Ni0.5Ti2(PO4)3/C electrode demonstrates a high rate capability performance and delivers high reversible capacities ranging from...

Université de Fribourg

Assessment of the potential for in-plume sulphur dioxide gas-ash interactions to influence the respiratory toxicity of volcanic ash

Tomašek, Ines ; Damby, David E. ; Horwell, Claire J. ; Ayris, Paul M. ; Delmelle, Pierre ; Ottley, Christopher J. ; Cubillas, Pablo ; Casas, Ana S. ; Bisig, Christoph ; Petri-Fink, Alke ; Dingwell, Donald B. ; Clift, Martin J. D. ; Drasler, Barbara ; Rothen-Rutishauser, Barbara

In: Environmental Research, 2019, vol. 179, p. 108798

Volcanic plumes are complex environments composed of gases and ash particles, where chemical and physical processes occur at different temperature and compositional regimes. Commonly, soluble sulphate- and chloride-bearing salts are formed on ash as gases interact with ash surfaces. Exposure to respirable volcanic ash following an eruption is potentially a significant health concern. The...

Université de Fribourg

A pyrene–poly(acrylic acid)–polyrotaxane supramolecular binder network for high-performance silicon negative electrodes

Cho, Yunshik ; Kim, Jaemin ; Elabd, Ahmed ; Choi, Sunghun ; Park, Kiho ; Kwon, Tae‐woo ; Lee, Jungmin ; Char, Kookheon ; Coskun, Ali ; Choi, Jang Wook

In: Advanced Materials, 2019, p. 1905048

Although being incorporated in commercial lithium‐ion batteries for a while, the weight portion of silicon monoxide (SiOx, x ≈ 1) is only less than 10 wt% due to the insufficient cycle life. Along this line, polymeric binders that can assist in maintaining the mechanical integrity and interfacial stability of SiOx electrodes are desired to realize higher contents of SiOx. Herein, a...

Université de Fribourg

Airborne medicine: bacterial volatiles and their influence on plant health

Garbeva, Paolina ; Weisskopf, Laure

In: New Phytologist, 2019, p. -

Like most other eukaryotes, plants do not live alone but in close association with a diverse microflora. These plant‐associated microbes contribute to plant health in many different ways, ranging from modulation of hormonal pathways to direct antibiosis of plant pathogens. Over the last 15 yr, the importance of volatile organic compounds as mediators of mutualistic interactions between...

Université de Fribourg

Structure and dynamics of the acyl chains in the membrane trafficking and enzymatic processing of lipids

Vanni, Stefano ; Riccardi, Laura ; Palermo, Giulia ; De Vivo, Marco

In: Accounts of Chemical Research, 2019, vol. 52, no. 11, p. 3087–3096

The regulatory chemical mechanisms of lipid trafficking and degradation are involved in many pathophysiological processes, being implicated in severe pain, inflammation, and cancer. In addition, the processing of lipids is also relevant for industrial and environmental applications. However, there is poor understanding of the chemical features that control lipid membrane trafficking and allow...

Université de Fribourg

Rapid evolution of invasive traits facilitates the invasion of common ragweed, Ambrosia artemisiifolia

Sun, Yan ; Roderick, George K.

In: Journal of Ecology, 2019, vol. 107, no. 6, p. 2673–2687

Invasive alien plants, together with organisms introduced for biological control, are ideal study systems with which to address questions of whether, and how fast, organisms adapt to changing environments. We compared populations of common ragweed, Ambrosia artemisiifolia, from native (USA) and introduced (China) ranges at similar latitudes, together with herbivores introduced for biological...

Université de Fribourg

Structural insights into the EGO-TC–mediated membrane tethering of the TORC1-regulatory Rag GTPases

Zhang, Tianlong ; Péli-Gulli, Marie-Pierre ; Zhang, Zhen ; Tang, Xin ; Ye, Jie ; Virgilio, Claudio De ; Ding, Jianping

In: Science Advances, 2019, vol. 5, no. 9, p. eaax8164

The Rag/Gtr GTPases serve as a central module in the nutrient-sensing signaling network upstream of TORC1. In yeast, the anchoring of Gtr1-Gtr2 to membranes depends on the Ego1-Ego2-Ego3 ternary complex (EGO-TC), resulting in an EGO- TC-Gtr1-Gtr2 complex (EGOC). EGO-TC and human Ragulator share no obvious sequence similarities and also differ in their composition with respect to the number of ...

Université de Fribourg

Regulation of TRPM8 channel activity by Src-mediated tyrosine phosphorylation

Manolache, Alexandra ; Selescu, Tudor ; Maier, G. Larisa ; Mentel, Mihaela ; Ionescu, Aura Elena ; Neacsu, Cristian ; Babes, Alexandru ; Szedlacsek, Stefan Eugen

In: Journal of Cellular Physiology, 2019, p. -

The transient receptor potential melastatin type 8 (TRPM8) receptor channel is expressed in primary afferent neurons where it is the main transducer of innocuous cold temperatures and also in a variety of tumors, where it is involved in progression and metastasis. Modulation of this channel by intracellular signaling pathways has therefore important clinical implications. We investigated the...

Université de Fribourg

Lymphatic vessels help mend broken hearts

Pfefferli, Catherine ; Jaźwińska, Anna

In: eLife, 2019, vol. 8, p. e52200

Experiments on zebrafish show that the regeneration of the heart after an injury is supported by lymphatic vessels.