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Showing 1 to 12 of 162 entries
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Panmixia defines the genetic diversity of a unique arthropod-dispersed fungus specific to Protea flowers.

Ecology and evolution

Aylward J, Dreyer LL, Steenkamp ET, Wingfield MJ, Roets F.
PMID: 25535560
Ecol Evol. 2014 Sep;4(17):3444-55. doi: 10.1002/ece3.1149. Epub 2014 Aug 21.

Knoxdaviesia proteae, a fungus specific to the floral structures of the iconic Cape Floral Kingdom plant, Protea repens, is dispersed by mites phoretic on beetles that pollinate these flowers. Although the vectors of K. proteae have been identified, little...

Partitioning of on-demand electron pairs.

Nature nanotechnology

Ubbelohde N, Hohls F, Kashcheyevs V, Wagner T, Fricke L, Kästner B, Pierz K, Schumacher HW, Haug RJ.
PMID: 25437747
Nat Nanotechnol. 2015 Jan;10(1):46-9. doi: 10.1038/nnano.2014.275. Epub 2014 Dec 01.

The on-demand generation and separation of entangled photon pairs are key components of quantum information processing in quantum optics. In an electronic analogue, the decomposition of electron pairs represents an essential building block for using the quantum state of...

Semiconductor quantized voltage source.

Physical review letters

Hohls F, Welker AC, Leicht Ch, Fricke L, Kaestner B, Mirovsky P, Müller A, Pierz K, Siegner U, Schumacher HW.
PMID: 23006195
Phys Rev Lett. 2012 Aug 03;109(5):056802. doi: 10.1103/PhysRevLett.109.056802. Epub 2012 Jul 31.

We realize and investigate an all-semiconductor quantized voltage source which generates quantized output voltages V(out) = f(h/e) linked only to two fundamental constants, the electron's charge e and Planck's constant h, and to an applied excitation frequency f. The...

Human exposure and health cannot be overlooked in environmental monitoring programmes. Overview.

Journal of cardiovascular risk

Staessen JA, Roels H.
PMID: 8783024
J Cardiovasc Risk. 1996 Feb;3(1):1-3. doi: 10.1097/00043798-199602000-00001.

No abstract available.

Hopping conductivity in the quantum Hall effect: revival of universal scaling.

Physical review letters

Hohls F, Zeitler U, Haug RJ.
PMID: 11801077
Phys Rev Lett. 2002 Jan 21;88(3):036802. doi: 10.1103/PhysRevLett.88.036802. Epub 2002 Jan 02.

We have measured the temperature dependence of the conductivity sigma(xx) of a two-dimensional electron system deep into the localized regime of the quantum Hall plateau transition. Using variable-range hopping theory we extract directly the localization length xi from this...

Observation of an interedge magnetoplasmon mode in a degenerate two-dimensional electron gas.

Physical review letters

Sukhodub G, Hohls F, Haug RJ.
PMID: 15600861
Phys Rev Lett. 2004 Nov 05;93(19):196801. doi: 10.1103/PhysRevLett.93.196801. Epub 2004 Nov 01.

We study the propagation of edge magnetoplasmons by time-resolved current measurements in a sample which allows for selective detection of edge states in the quantum Hall regime. At filling factors close to nu=3 we observe two decoupled modes of...

Enhanced shot noise in tunneling through a stack of coupled quantum dots.

Physical review letters

Barthold P, Hohls F, Maire N, Pierz K, Haug RJ.
PMID: 16907268
Phys Rev Lett. 2006 Jun 23;96(24):246804. doi: 10.1103/PhysRevLett.96.246804. Epub 2006 Jun 21.

We have investigated the noise properties of the tunneling current through vertically coupled self-assembled InAs quantum dots. We observe super-Poissonian shot noise at low temperatures. For increased temperature this effect is suppressed. The super-Poissonian noise is explained by capacitive...

Direct measurement of the g factor of composite fermions.

Physical review letters

Schulze-Wischeler F, Mariani E, Hohls F, Haug RJ.
PMID: 15169302
Phys Rev Lett. 2004 Apr 16;92(15):156401. doi: 10.1103/PhysRevLett.92.156401. Epub 2004 Apr 16.

The activation gap Delta of the fractional quantum Hall states at constant fillings nu=2/3 and 2/5 has been measured as a function of the perpendicular magnetic field B. A linear dependence of Delta on B is observed while approaching...

Estimating genomic breeding values and detecting QTL using univariate and bivariate models.

BMC proceedings

Calus MP, Mulder HA, Veerkamp RF.
PMID: 21624175
BMC Proc. 2011 May 27;5:S5. doi: 10.1186/1753-6561-5-S3-S5.

BACKGROUND: Genomic selection is particularly beneficial for difficult or expensive to measure traits. Since multi-trait selection is an important tool to deal with such cases, an important question is what the added value is of multi-trait genomic selection.METHODS: The...

New primers for single-copy nuclear-encoded chloroplast-expressed glutamine synthetase (ncpGS) in Oxalidaceae.

American journal of botany

Oberlander KC, Dreyer LL, Roets F.
PMID: 21616835
Am J Bot. 2010 Dec;97(12):e146-8. doi: 10.3732/ajb.1000390. Epub 2010 Nov 05.

PREMISE OF THE STUDY: New primers were developed for the nuclear marker glutamine synthetase (ncpGS) in Oxalidaceae. •METHODS AND RESULTS: New forward and reverse primers were designed and tested across a wide range of Oxalidaceae. Selected taxa were sequenced...

Effect of epidermal growth factor in collagen gel cultures of rat hepatocytes.

Toxicology in vitro : an international journal published in association with BIBRA

De Smet K, Beken S, Depreter M, Roels F, Vercruysse A, Rogiers V.
PMID: 20654519
Toxicol In Vitro. 1999 Aug-Oct;13(4):579-85. doi: 10.1016/s0887-2333(99)00041-7.

Collagen gel cultures of hepatocytes represent a promising in vitro model in pharmaco-toxicology. Epidermal growth factor (EGF) is usually added to the culture medium, although one could question its value in a culture model aiming at maintaining a maximum...

Top-down GaN nanowire transistors with nearly zero gate hysteresis for parallel vertical electronics.

Scientific reports

Fatahilah MF, Yu F, Strempel K, Römer F, Maradan D, Meneghini M, Bakin A, Hohls F, Schumacher HW, Witzigmann B, Waag A, Wasisto HS.
PMID: 31311946
Sci Rep. 2019 Jul 16;9(1):10301. doi: 10.1038/s41598-019-46186-9.

This paper reports on the direct qualitative and quantitative performance comparisons of the field-effect transistors (FETs) based on vertical gallium nitride nanowires (GaN NWs) with different NW numbers (i.e., 1-100) and diameters (i.e., 220-640 nm) fabricated on the same...

Showing 1 to 12 of 162 entries