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Université de Neuchâtel

The Microloop-Gap Resonator: A Novel Miniaturized Microwave Cavity for Double-Resonance Rubidium Atomic Clocks

Violetti, Maddalena ; Pellaton, Matthieu ; Affolderbach, Christoph ; Merli, Francesco ; Zürcher, Jean-François ; Mileti, Gaetano ; Skrivervik, Anja K

In: IEEE Sensors Journal, 2014, vol. 14, no. 9, p. 3193-3200

Nowadays mobile and battery-powered applications push the need for radically miniaturized and low-power frequency standards that surpass the stability achievable with quartz oscillators. For the miniaturization of double-resonance rubidium (87Rb) atomic clocks, the size reduction of the microwave cavity or resonator (MWR) to well below the wavelength of the atomic transition (6.835 GHz...

Public access from 1-dic-2014
Université de Neuchâtel

Ultra-stable microwave generation with a diode-pumped solid-state laser in the 1.5-µm range

Dolgovskiy, Vladimir ; Schilt, Stéphane ; Bucalovic, Nikola ; Di Domenico, Gianni ; Grop, Serge ; Dubois, Benoît ; Giordano, Vincent ; Südmeyer, Thomas

In: Applied Physics B : Lasers and optics, 2014, vol. 116, no. 3, p. 593-601

We demonstrate the first ultra-stable microwave generation based on a 1.5-µm diode-pumped solid-state laser (DPSSL) frequency comb. Our system relies on optical-to-microwave frequency division from a planar-waveguide external cavity laser referenced to an ultra-stable Fabry–Perot cavity. The evaluation of the microwave signal at ~10 GHz uses the transportable ultra-low-instability signal...

Université de Neuchâtel

The genome of the Gram-positive metal- and sulfate-reducing bacterium Desulfotomaculum reducens strain MI-1

Junier, Pilar ; Junier, Thomas ; Podell, Sheila ; Sims, David R ; Detter, John C ; Lykidis, Athanasios ; Han, Cliff S ; Wigginton, Nicholas S ; Gaasterland, Terry ; Bernier-Latmani, Rizlan

In: Environmental Microbiology, 2010, vol. 12, no. 10, p. 2738–2754

Spore-forming, Gram-positive sulfate-reducing bacteria (SRB) represent a group of SRB that dominates the deep subsurface as well as niches in which resistance to oxygen and dessication is an advantage. Desulfotomaculum reducens; strain MI-1 is one of the few cultured representatives of that group with a complete genome sequence available. The metabolic versatility of this organism is...

Université de Neuchâtel

Phylogenetic and functional marker genes to study ammonia-oxidizing microorganisms (AOM) in the environment

Junier, Pilar ; Molina, Verónica ; Dorador, Cristina ; Hadas, Ora ; Kim, Ok-Sun ; Junier, Thomas ; Witzel, Karl-Paul ; Imhoff, Johannes F

In: Applied Microbiology and Biotechnology, 2010, vol. 85, no. 3, p. 425-440

The oxidation of ammonia plays a significant role in the transformation of fixed nitrogen in the global nitrogen cycle. Autotrophic ammonia oxidation is known in three groups of microorganisms. Aerobic ammonia-oxidizing bacteria and archaea convert ammonia into nitrite during nitrification. Anaerobic ammonia-oxidizing bacteria (anammox) oxidize ammonia using nitrite as electron acceptor and...

Université de Neuchâtel

Water vapour and heat combine to elicit biting and biting persistence in tsetse

Chappuis, Charles JF ; Béguin, Steve ; Vlimant, Michèle ; Guerin, Patrick M

In: Parasites and Vectors, 2013, vol. 6, no. 240, p. 1-11

Tsetse flies are obligatory blood feeders, accessing capillaries by piercing the skin of their hosts with the haustellum to suck blood. However, this behaviour presents a considerable risk as landing flies are exposed to predators as well as the host’s own defense reactions such as tail flicking. Achieving a successful blood meal within the shortest time span is therefore at a premium in...

Université de Neuchâtel

Torymus sinensis: a viable management option for the biological control of Dryocosmus kuriphilus in Europe?

Gibbs, Melanie ; Schoenrogge, Karsten ; Alma, Alberto ; Melika, George ; Quacchia, Ambra ; Stone, Graham N ; Aebi, Alexandre

In: BioControl, 2011, vol. 56, no. 4, p. 527–538

The chestnut gall wasp Dryocosmus kuriphilus is a global pest of chestnut (Castanea spp). Established as a pest in the mid-twentieth century in Japan, Korea and North America, this species was first reported in Europe in 2002. Following the successful release of a biological control agent Torymus sinensis in Japan, this parasitoid species has been released in Italy since...

Public access from 1-dic-2014
Université de Neuchâtel

Molecular analysis of the gut contents of Harmonia axyridis (Coleoptera: Coccinellidae) as a method for detecting intra-guild predation by this species on aphidophagous predators other than coccinellids

Ingels, Brecht ; Aeby, Alexandre ; Hautier, Louis ; Van Leeuwen, Thomas ; De Clerc, Patrick

In: European Journal of Entomology, 2013, vol. 110, no. 4, p. 567-576

Several studies have demonstrated that the invasive ladybird Harmonia axyridis is a strong intra-guild predator of native species of ladybird. Laboratory studies have shown that H. axyridis can be an intra-guild predator of aphid predators other than coccinellids, including the hoverfly Episyrphus balteatus and lacewing Chrysoperla carnea. However, little is known about...

Université de Neuchâtel

Frequency Noise and Linewidth of Mid-infrared Continuous-Wave Quantum Cascade Lasers: An Overview

Schilt, Stéphane ; Tombez, Lionel ; Di Domenico, Gianni ; Hofstetter, Daniel

In: The Wonders of Nanotechnology: Quantum and Optoelectronic Devices and Applications (chapter 12), 2013, p. 261-287

Université de Neuchâtel

High-power integrated ultrafast semiconductor disk laser: multi-Watt 10 GHz pulse generation

Wittwer, Valentin J ; Mangold, Mario ; Hoffmann, Martin ; Sieber, Oliver D ; Golling, Matthias ; Südmeyer, Thomas ; Keller, Ursula

In: Electronic Letters, 2012, vol. 48, no. 18, p. 1144-1145

Presented is an optically pumped modelocked integrated externalcavity surface emitting laser (MIXSEL) with a pulse repetition rate of 10 GHz, generating picosecond pulses at 2.4 W average output power at a centre wavelength of 963 nm. The MIXSEL structure integrates both the absorber and the gain layers within the same wafer. The saturable absorber is a single layer of self-assembled InAs quantum...