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Direct force measurements on DNA in a solid-state nanopore

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… Koeleman, S Van Dorp, D Krapf, RMM Smeets, SG … - Nature Physics, 2006 - nature.com
Among the variety of roles for nanopores in biology, an important one is enabling polymer
transport, for example in gene transfer between bacteria 1 and transport of RNA through the
nuclear membrane 2 . Recently, this has inspired the use of protein 3, 4, 5 and solid-state ...
Cited by 121 - Related articles - BL Direct - All 41 versions

Salt dependence of ion transport and DNA translocation through solid-state nanopores

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RMM Smeets, UF Keyser, D Krapf, MY Wu, NH … - Nano Lett, 2006 - ACS Publications
We report experimental measurements of the salt dependence of ion transport and DNA translocation
through solid-state nanopores. The ionic conductance shows a three-order-of-magnitude decrease
with decreasing salt concentrations from 1 M to 1 μM, strongly deviating from bulk linear ...
Cited by 102 - Related articles - All 38 versions

[PDF] Control of shape and material composition of solid-state nanopores

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… , M Zandbergen, U Ziese, D Krapf, PE Batson, NH … - Nano Lett, 2008 - jpole.colostate.edu
Solid-state nanopores fabricated by a high-intensity electron beam in ceramic membranes can
be fine-tuned on three-dimensional geometry and composition by choice of materials and beam
sculpting conditions. For similar beam conditions, 8 nm diameter nanopores fabricated in ...
Cited by 5 - Related articles - View as HTML - All 27 versions

dsDNA and nanobubble studies using solid-state nanopores

R Smeets, U Keyser, D Krapf, MY Wu, N … - APS Meeting …, 2007 - adsabs.harvard.edu
DNA transport through fabricated solid-state nanopores is studied at various salt
concentrations. dsDNA translocation at 1M KCl results in current blokkades, whereas by contrast
current enhancements are observed at low salt concentrations. These current changes ...
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[PDF] Fabrication and Characterization of Nanopore-Based Electrodes with Radii down to 2 nm

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D Krapf, MY Wu, RMM Smeets, HW … - Nano …, 2006 - supportengineering.colostate.edu
We report on the fabrication and characterization of gold nanoelectrodes with carefully controlled
nanometer dimensions in a matrix of insulating silicon nitride. A focused electron beam was employed
to drill nanopores in a thin silicon nitride membrane. The size and shape of the ...
Cited by 37 - Related articles - View as HTML - All 38 versions

Tracking Single Potassium Channels in Live Mammalian Cells

AV Weigel, MM Tamkun, D Krapf - Laser Science XXV, 2009 - opticsinfobase.org
» View Full Text: Acrobat PDF (118 KB) * * Note that full-text PDFs from conferences typically
contain 1-3 pages of content, some or all of which might be an abstract, summary, or miscellaneous
items. ... Single molecule tracking in concert with mean square displacement and ...

[CITATION] Capacitation-like changes in external fertilization: correlation of physiological modifications with fertilizing capacity acquisition in Bufo arenarum …

FindIt@CSUD Krapf, PE Visconti, SE Arranz, MO Cabada - Developmental Biology, 2007 - Elsevier

Single Molecule Kv2. 1 Channel Dynamics in Live Mammalian Cells

A Weigel, M Tamkun, D Krapf - APS Meeting Abstracts, 2010 - adsabs.harvard.edu
Kv2.1 channels localize into micron-sized clusters. This feature is essential for neuronal
function, yet the physical mechanisms behind this unique cluster formation and maintenance
are widely unknown. We are investigating the dynamics of Kv2.1 channels at the single ...
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Mesoscopic concentration fluctuations in a fluidic nanocavity detected by redox cycling

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MAG Zevenbergen, D Krapf, MR Zuiddam, SG Lemay - Nano Lett, 2007 - ACS Publications
The ability to locally detect few or individual molecules in solution is at present largely limited
to fluorescence techniques, and a comparable method using electrical detection has so far remained
elusive. Such a technique would be highly desirable for lab-on-a-chip applications and ...
Cited by 16 - Related articles - All 37 versions

Fluorescence Immunoassay for the Detection of Latent Tuberculosis Antigens with Single Molecule Sensitivity

… , JW Hill, JS Spencer, MR McNeil, D Krapf - Frontiers in …, 2009 - opticsinfobase.org
» View Full Text: Acrobat PDF (370 KB) * * Note that full-text PDFs from conferences typically
contain 1-3 pages of content, some or all of which might be an abstract, summary, or miscellaneous
items. ... The successful identification and detection at the single molecule level of ...

Experimental observation of nonlinear ionic transport at the nanometer scale

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D Krapf, BM Quinn, MY Wu, HW Zandbergen, C … - Nano Lett, 2006 - ACS Publications
Compared to equilibrium properties, the transport of ions near charged interfaces remains poorly
understood. The difficulty lies in disentangling the contributions from electrostatics,
hydrodynamics, and solvent structure on the scale of a few nanometers. Several recent ...
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Probing Kv2. 1 Channel Dynamics Using Single Molecule Tracking

A Weigel, M Tamkun, D Krapf - APS Meeting Abstracts, 2009 - adsabs.harvard.edu
Kv2.1 potassium channels localize into micron-sized clusters in live neurons. This exceptional
characteristic is essential for cellular function. Nevertheless, the physical mechanism behind
Kv2.1 cluster formation and maintenance is largely unknown. We are investigating the ...
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Formation of nanopores in a SiN∕ SiO membrane with an electron beam

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MY Wu, D Krapf, M Zandbergen, H Zandbergen, … - Applied Physics …, 2005 - link.aip.org
An electron beam can drill nanopores in or silicon nitride membranes and shrink a pore to a
smaller diameter. Such nanopores are promising for single molecule detection. The pore formation
in a thick silicon nitride∕ bilayer using an electron beam with a diameter of (full width of ...
Cited by 23 - Related articles - BL Direct - All 35 versions

Resonant coupling between surface vibrations and electronic states in silicon nanocrystals at the strong confinement regime

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… 'Ar, Y Reichman, M Dovrat, D Krapf, J Jedrzejewski, I … - Nano Lett, 2005 - ACS Publications
A striking correlation between infrared photoinduced absorption spectra and the photoluminescence
from silicon nanocrystals indicates that quantized electronic sublevels of the nanocrystals are
resonantly coupled to surface vibrational modes via a polarization field produced by ...
Cited by 21 - Related articles - All 24 versions

[PDF] Nanopore tomography of a laser focus

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UF Keyser, D Krapf, BN Koeleman, RMM Smeets, NH … - Nano letters, 2005 - tudelft.nl
We demonstrate that the ionic current through a solid-state nanopore can be used to measure
at single nanometer resolution the three- dimensional intensity profile of a laser directly in the
focus of a microscope objective. We find a linear dependence of the ionic current on the ...
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Lithographically fabricated nanopore-based electrodes for electrochemistry

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… den Broek, AJ Storm, D Krapf, RMM Smeets, HA … - Anal. Chem, 2005 - ACS Publications
The miniaturization of electrodes extends the capabilities of voltammetry as an analytical
technique. This stems ultimately from the higher current densities and the shorter times needed
to reach the diffusive steady state when using small electrodes. 1,2 Several techniques ...
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[CITATION] Philip E. Batson

FindIt@CSUMY Wu, D Krapf, M Zandbergen, H Zandbergena - Appl. Phys. Lett, 2005
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Dynamics of Kv2. 1 channel cluster formation in mammalian neurons.

D Krapf - APS Meeting Abstracts, 2009 - adsabs.harvard.edu
Kv2.1 are potassium channels that play an important role in multiple organs and tissues. In
particular, in mammalian neurons Kv2.1 channels have an enormous neuroprotective function
attained by their ability to form large clusters on the surface of the neuronal cell body. The ...
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Anomalous ionic transport at nanometer-scale electrodes

D Krapf, B Quinn, MY Wu, H Zandbergen, … - APS Meeting …, 2006 - adsabs.harvard.edu
We probe the transport of charged species in high ionic strength solutions on the scale of a few
nanometers by monitoring electrochemical reactions at correspondingly sized electrodes. The
electrical current through the nanoelectrode provides a direct measure of the flux of ions ...
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[CITATION] MM, Lemay SG

UF Keyser, BN Koeleman, S Van Dorp, D Krapf, R … - … on DNA in a solid-state …, 2006
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Field-Friendly Tuberculosis Biosensor

… , M Scherman, MR McNeil, D Krapf - APS Meeting …, 2010 - adsabs.harvard.edu
Tuberculosis is a fading threat in the United States, but in the developing world it is still a major
health-care concern. With the rising number of cases and lack of resources, there is a desperate
need for an affordable, portable detection system. Here, we demonstrate the feasibility of ...
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Infrared multispectral detection using Si/SiGe quantum well infrared photodetectors

FindIt@CSUD Krapf, B Adoram, J Shappir, A Sa'ar, SG … - Applied Physics …, 2001 - link.aip.org
A modified p-type Si/SiGe quantum well infrared photodetector for multispectral infrared imaging
applications is demonstrated. In order to improve the detector's performances we have used
a SiGe emitter and a low-temperature wet passivation process that give rise to a reduced ...
Cited by 15 - Related articles - BL Direct

[CITATION] Resonant Coupling between Surface Vibrations and Electronic States in Silicon Nanocrystals at the Strong Confinement Regime

FindIt@CSU… ; ar, Y Reichman, M Dovrat, D Krapf, … - Nano …, 2005 - Washington, DC: American …

Formation of nanopores in a SiN/SiO {sub 2} membrane with an electron beam

W Mengyue, D Krapf, M Zandbergen, H … - Applied Physics …, 2005 - osti.gov
An electron beam can drill nanopores in SiO{sub 2} or silicon nitride membranes and shrink
a pore to a smaller diameter. Such nanopores are promising for single molecule detection. The
pore formation in a 40 nm thick silicon nitride/SiO{sub 2} bilayer using an electron beam ...
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Intersublevel optical transitions in InAs nanocrystals probed by photoinduced absorption spectroscopy: The role of thermal activation

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D Krapf, SH Kan, U Banin, O Millo, A Sa'ar - Physical Review B, 2004 - APS
Optical transitions between the quantized sublevels of colloidally synthesized InAs nanocrystals
have been revealed using infrared photoinduced absorption spectroscopy. Two different groups
of intersublevel transitions were observed. Using a correlation between the measured ...
Cited by 5 - Related articles - BL Direct - All 23 versions

Probing diffusion on the nanometer scale using electrochemistry

D Krapf - APS Meeting Abstracts, 2005 - adsabs.harvard.edu
Studying ion diffusion in liquid at the nanometer scale is experimentally very challenging. We
report on an electrochemical approach to this problem: an electrode of nanometer dimensions
is immersed in solution and biased so as to drive an electron transfer reaction with an ...
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[PDF] Infrared multispectral detection using Si/SixGe1-x quantum well infrared photodetectors

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D Krapf, B Adoram, J Shappir, A Sa'Ar, SG … - Applied Physics …, 2001 - istec.colostate.edu
A modified p-type Si/SiGe quantum well infrared photodetector for multispectral infrared imaging
applications is demonstrated. In order to improve the detector's performances we have used
a SiGe emitter and a low-temperature wet passivation process that give rise to a reduced ...
Cited by 5 - Related articles - View as HTML - All 28 versions

Salt Dependence of Ion Transport and DNA Translocation through Solid-State Nanopores

RMMSUF Keyser, DKMYW Nynke, HDC Dekker - Nano letters, 2006 - 万方数据资源系统
... a KCI concentration of 370 +- 40 mM. 作者: Ralph MMSmeetsUlrich F.KeyserDiego
KrapfMeng-Yue WuNynke H.DekkerCees Dekker 刊名: Nano letters 年,卷(期):
2006Vol.6(no.1) 分类号: 关键词: 正文语种: eng 基金项目:. ...
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[CITATION] BRIEF REPORTS-Semiconductors II: Surfaces, interfaces, microstructures, and related topics-Intersublevel optical transitions in InAs nanocrystals probed …

FindIt@CSUD Krapf, SH Kan, U Banin, O … - Physical …, 2004 - Woodbury, NY: published by the …

[PDF] Infrared photo-induced absorption spectroscopy of porous silicon

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D Krapf, A Davidi, J Shappir, A Sa'Ar - Physica Status Solidi(a), 2003 - ist.colostate.edu
© 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 0031-8965/03/19705-0566 $
17.50+.50/0 ... Infrared photo-induced absorption spectroscopy of porous silicon ... D. Krapf,
A. Davidi, J. Shappir, and A. Sa'ar* Department of Applied Physics, The Hebrew ...
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Thermal relaxation processes probed by intersubband and inter-valence-band transitions in Si/SiGe multiple quantum wells

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B Adoram, D Krapf, J Shappir, A Sa'ar, M Levy, R … - Applied Physics …, 1999 - link.aip.org
Thermal relaxation processes due to strain relaxation and Si/Ge interdiffusion were investigated
in pseudomorphic p-type SiGe/Si quantum wells using infrared-polarization-resolved absorption
spectroscopy. The samples were annealed from room temperature up to 1060 °C and ...
Cited by 2 - Related articles - BL Direct - All 26 versions

Intersublevel optical transitions in InAs nanocrystals probed by photoinduced absorption spectroscopy: The role of thermal activation-art. no. 073301

D Krapf, SH Kan, U Banin, O Millo, A … - Physical review. B, …, 2004 - 万方数据资源系统
... process to the presence of shallow surface localized hole states. [References: 28].
作者: Krapf D.;Kan SH.;Banin U.;Millo O.;Sa'ar A. 刊名: Physical review. B,
Condensed Matter And Materals Physics 年,卷(期): 2004Vol.6907 ...
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Thermal relaxation processes in Si1-xGex/Si quantum wells studied by inter-subband and inter-valence band spectroscopy

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B Adoram, D Krapf, M Levy, R Beserman, S … - Physica E: Low- …, 2000 - Elsevier
In this paper we present a systematic experimental investigation of the optical properties associated
with inter-subband and inter-valence band transitions in p-type pseudomorphic Si 1−x Ge x
/Si multiple quantum-wells structure under high-temperature thermal treatments. The ...
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