@article{3061, abstract = {The PIN-FORMED (PIN) proteins are secondary transporters acting in the efflux of the plant signal molecule auxin from cells. They are asymmetrically localized within cells and their polarity determines the directionality of intercellular auxin flow. PIN genes are found exclusively in the genomes of multicellular plants and play an important role in regulating asymmetric auxin distribution in multiple developmental processes, including embryogenesis, organogenesis, tissue differentiation and tropic responses. All PIN proteins have a similar structure with amino- and carboxy-terminal hydrophobic, membrane-spanning domains separated by a central hydrophilic domain. The structure of the hydrophobic domains is well conserved. The hydrophilic domain is more divergent and it determines eight groups within the protein family. The activity of PIN proteins is regulated at multiple levels, including transcription, protein stability, subcellular localization and transport activity. Different endogenous and environmental signals can modulate PIN activity and thus modulate auxin-distribution-dependent development. A large group of PIN proteins, including the most ancient members known from mosses, localize to the endoplasmic reticulum and they regulate the subcellular compartmentalization of auxin and thus auxin metabolism. Further work is needed to establish the physiological importance of this unexpected mode of auxin homeostasis regulation. Furthermore, the evolution of PIN-based transport, PIN protein structure and more detailed biochemical characterization of the transport function are important topics for further studies.}, author = {Křeček, Pavel and Skůpa, Petr and Libus, Jiří and Naramoto, Satoshi and Tejos, Ricardo and Friml, Jirí and Zažímalová, Eva}, journal = {Genome Biology}, number = {12}, publisher = {BioMed Central}, title = {{The PIN-FORMED (PIN) protein family of auxin transporters}}, doi = {10.1186/gb-2009-10-12-249}, volume = {10}, year = {2009}, } @article{12654, abstract = {We investigate the transferability of an enhanced temperature-index melt model that was developed and tested on Haut Glacier d’Arolla, Switzerland, in the 2001 season. The model’s empirical parameters (temperature factor, TF, and shortwave radiation factor, SRF) are recalibrated for: (1) other locations on Haut Glacier d’Arolla; (2) subperiods of distinct meteorological conditions; (3) different years on Haut Glacier d’Arolla; and (4) other glaciers in different years. The model parameters are optimized against simulations of an energy-balance model validated against ablation observations. Results are compared with those obtained with the original parameters. The model works very well when applied to other sites, seasons and glaciers, with the exception of overcast conditions. Differences are due to underestimation of high melt rates. The parameter values are associated with the prevailing energy-balance conditions, showing that high SRF are obtained on clear-sky days, whereas higher TF are typical of locations where glacier winds prevail and turbulent fluxes are high. We also provide a range of parameters clearly associated with the site’s location and its meteorological characteristics that could help to assign parameter values to sites where few data are available.}, author = {Carenzo, Marco and Pellicciotti, Francesca and Rimkus, Stefan and Burlando, Paolo}, issn = {1727-5652}, journal = {Journal of Glaciology}, number = {190}, pages = {258--274}, publisher = {Cambridge University Press}, title = {{Assessing the transferability and robustness of an enhanced temperature-index glacier-melt model}}, doi = {10.3189/002214309788608804}, volume = {55}, year = {2009}, } @article{12655, abstract = {We discuss the inclusion of the subsurface heat-conduction flux into the calculation of the energy balance and ablation at the glacier–atmosphere interface. Data from automatic weather stations are used to force an energy-balance model at several locations on alpine glaciers and at one site in the dry Andes of central Chile. The heat-conduction flux is computed using a two-layer scheme, assuming that 36% of the net shortwave radiation is absorbed by the surface layer and that the rest penetrates into the snowpack. We compare simulations conducted with and without subsurface heat flux. Results show that assuming a surface temperature of zero degrees leads to a larger overestimation of melt at the sites in the accumulation area (10.4–13.3%) than in the ablation area (0.5–2.8%), due to lower air temperatures and the presence of snow. The difference between simulations with and without heat conduction is also high at the beginning and end of the ablation season (up to 29% for the first 15 days of the season), when air temperatures are lower and snow covers the glacier surface, while they are of little importance during periods of sustained melt at all the locations investigated.}, author = {Pellicciotti, Francesca and Carenzo, Marco and Helbing, Jakob and Rimkus, Stefan and Burlando, Paolo}, issn = {1727-5644}, journal = {Annals of Glaciology}, number = {50}, pages = {16--24}, publisher = {International Glaciological Society}, title = {{On the role of subsurface heat conduction in glacier energy-balance modelling}}, doi = {10.3189/172756409787769555}, volume = {50}, year = {2009}, } @article{1302, abstract = {The nervous system of seeing animals derives information about optic flow in two subsequent steps. First, local motion vectors are calculated from moving retinal images, and second, the spatial distribution of these vectors is analyzed on the dendrites of large downstream neurons. In dipteran flies, this second step relies on a set of motion-sensitive lobula plate tangential cells (LPTCs), which have been studied in great detail in large fly species. Yet, studies on neurons that convey information to LPTCs and neuroanatomical investigations that enable a mechanistic understanding of the underlying dendritic computations in LPTCs are rare. We investigated the subcellular distribution of nicotinic acetylcholine receptors (nAChRs) on two sets of LPTCs: vertical system (VS) and horizontal system (HS) cells in Drosophila melanogaster. In this paper, we describe that both cell types express Dα7-type nAChR subunits specifically on higher order dendritic branches, similar to the expression of gamma aminobutyric acid (GABA) receptors. These findings support a model in which directional selectivity of LPTCs is achieved by the dendritic integration of excitatory, cholinergic, and inhibitory GABA-ergic input from local motion detectors with opposite preferred direction. Nonetheless, whole-cell recordings in mutant flies without Dα7 nAChRs revealed that direction selectivity of VS and HS cells is largely retained. In addition, mutant LPTCs were responsive to acetylcholine and remaining nAChR receptors were labeled by α-bungarotoxin. These results in LPTCs with genetically manipulated excitatory input synapses suggest a robust cellular implementation of dendritic processing that warrants direction selectivity. The underlying mechanism that ensures appropriate nAChR-mediated synaptic currents and the functional implications of separate sets or heteromultimeric nAChRs can now be addressed in this system.}, author = {Raghu, Shamprasad V and Maximilian Jösch and Sigrist, Stephan J and Borst, Alexander and Reiff, Dierk F}, journal = {Journal of Neurogenetics}, number = {1-2}, pages = {200 -- 209}, publisher = {Informa Healthcare}, title = {{Synaptic organization of lobula plate tangential cells in Drosophila: Dα7 cholinergic receptors}}, doi = {10.1080/01677060802471684}, volume = {23}, year = {2009}, } @inproceedings{2094, abstract = {This paper introduces a data-driven representation and modeling technique for simulating non-linear heterogeneous soft tissue. It simplifies the construction of convincing deformable models by avoiding complex selection and tuning of physical material parameters, yet retaining the richness of non-linear heterogeneous behavior. We acquire a set of example deformations of a real object, and represent each of them as a spatially varying stress-strain relationship in a finite-element model. We then model the material by non-linear interpolation of these stress-strain relationships in strain-space. Our method relies on a simple-to-build capture system and an efficient run-time simulation algorithm based on incremental loading, making it suitable for interactive computer graphics applications. We present the results of our approach for several non-linear materials and biological soft tissue, with accurate agreement of our model to the measured data. }, author = {Bernd Bickel and Bac̈her, Moritz and Otaduy, Miguel A and Matusik, Wojciech and Pfister, Hanspeter and Groß, Markus S}, number = {3}, publisher = {ACM}, title = {{Capture and modeling of non-linear heterogeneous soft tissue}}, doi = {10.1145/1576246.1531395 }, volume = {28}, year = {2009}, } @article{21150, abstract = {The crystal structure of d(CACACG)·d(CGTGTG) was solved to a resolution of 2.05 Å in space group P21. The duplex assumes the left-handed Z-DNA structure. The presence of two A·T base pairs in the hexamer does not greatly affect the conformation. The most significant changes compared with the regular structure of Z-DNA are in the values of twist in the central portion of the helix. This variation, as well as others in the values of roll, inclination etc., follow the pattern observed previously in the structure of d(CGCACG)·d(CGTGCG).}, author = {Venkadesh, S. and Mandal, Pradeep K and Gautham, N.}, issn = {1744-3091}, journal = {Acta Crystallographica Section F Structural Biology Communications}, number = {1}, pages = {8--13}, publisher = {International Union of Crystallography}, title = {{The structure of d(CACACG)·d(CGTGTG)}}, doi = {10.1107/s1744309108037706}, volume = {65}, year = {2009}, } @article{2119, abstract = {Let (E, H, μ) be an abstract Wiener space and let DV : = V D, where D denotes the Malliavin derivative and V is a closed and densely defined operator from H into another Hilbert space under(H, {combining low line}). Given a bounded operator B on under(H, {combining low line}), coercive on the range over(R (V), -), we consider the operators A : = V* B V in H and under(A, {combining low line}) : = V V* B in under(H, {combining low line}), as well as the realisations of the operators L : = DV* B DV and under(L, {combining low line}) : = DV DV* B in Lp (E, μ) and Lp (E, μ ; under(H, {combining low line})) respectively, where 1 < p < ∞. Our main result asserts that the following four assertions are equivalent: (1)D (sqrt(L)) = D (DV) with {norm of matrix} sqrt(L) f {norm of matrix}p {minus tilde} {norm of matrix} DV f {norm of matrix}p for f ∈ D (sqrt(L));(2)under(L, {combining low line}) admits a bounded H∞-functional calculus on over(R (DV), -);(3)D (sqrt(A)) = D (V) with {norm of matrix} sqrt(A) h {norm of matrix} {minus tilde} {norm of matrix} V h {norm of matrix} for h ∈ D (sqrt(A));(4)under(A, {combining low line}) admits a bounded H∞-functional calculus on over(R (V), -). Moreover, if these conditions are satisfied, then D (L) = D (DV2) ∩ D (DA). The equivalence (1)-(4) is a non-symmetric generalisation of the classical Meyer inequalities of Malliavin calculus (where under(H, {combining low line}) = H, V = I, B = frac(1, 2) I). A one-sided version of (1)-(4), giving Lp-boundedness of the Riesz transform DV / sqrt(L) in terms of a square function estimate, is also obtained. As an application let -A generate an analytic C0-contraction semigroup on a Hilbert space H and let -L be the Lp-realisation of the generator of its second quantisation. Our results imply that two-sided bounds for the Riesz transform of L are equivalent with the Kato square root property for A. The boundedness of the Riesz transform is used to obtain an Lp-domain characterisation for the operator L.}, author = {Jan Maas and van Neerven, Jan M}, journal = {Journal of Functional Analysis}, number = {8}, pages = {2410 -- 2475}, publisher = {Academic Press}, title = {{Boundedness of Riesz transforms for elliptic operators on abstract Wiener spaces}}, doi = {10.1016/j.jfa.2009.07.001}, volume = {257}, year = {2009}, } @inproceedings{2136, abstract = {The local atomic structure of PbTiO3, BaTiO3, and KNbO3 perovskite-type crystals and K x Na1 − x NbO3 solid solutions in different phases is investigated using the angular dependence of the pre-edge structure of the Ti and Nb K X-ray absorption spectra and the EXAFS data. In noncubic phases, a considerable deviation of the local structure from the structure determined from diffraction data is observed only for the tetragonal phase of the BaTiO3 crystal. It is revealed that, in the cubic phase of niobates, the niobium atoms are characterized by significant displacements from the centrosymmetric positions along the threefold axes, so that they are close in the magnitude and the direction to the displacements in the low-temperatures rhombohedral phases.}, author = {Vedrinskiǐ, Rostislav V and Kraǐzman, V. L and Mikhail Lemeshko and Nazarenko, Elena S and Novakovich, Alexander A and Reznichenko, Larisa A and Fokin, Vladimir N and Shuvaeva, Victoria A}, number = {7}, pages = {1394 -- 1398}, publisher = {Springer}, title = {{Local atomic structure of niobates and titanates from X-ray absorption spectroscopic data}}, doi = {10.1134/S106378340907018X}, volume = {51}, year = {2009}, } @article{2137, abstract = {Relying on the quantization rule of Raab and Friedrich [Phys. Rev. A (2009) in press], we derive simple and accurate formulae for the number of rotational states supported by a weakly bound vibrational level of a diatomic molecular ion. We also provide analytic estimates of the rotational constants of any such levels up to threshold for dissociation and obtain a criterion for determining whether a given weakly bound vibrational level is rotationless. The results depend solely on the long-range part of the molecular potential.}, author = {Mikhail Lemeshko and Frierich, Bretislav}, journal = {Journal of Atomic and Molecular Sciences}, number = {1}, pages = {41 -- 47}, publisher = {Global Science Press}, title = {{Rotational structure of weakly bound molecular ions}}, doi = {10.4208/jams.101009.110209a}, volume = {1}, year = {2009}, } @article{2149, abstract = {We investigate the effects of a magnetic field on the dynamics of rotationally inelastic collisions of open-shell molecules (Σ2, Σ3, and Π2) with closed-shell atoms. Our treatment makes use of the Fraunhofer model of matter wave scattering and its recent extension to collisions in electric [M. Lemeshko and B. Friedrich, J. Chem. Phys. 129, 024301 (2008)] and radiative fields [M. Lemeshko and B. Friedrich, Int. J. Mass. Spec. 280, 19 (2009)]. A magnetic field aligns the molecule in the space-fixed frame and thereby alters the effective shape of the diffraction target. This significantly affects the differential and integral scattering cross sections. We exemplify our treatment by evaluating the magnetic-field-dependent scattering characteristics of the He-CaH (XΣ+2), He-O2 (XΣ–3), and He-OH (XΠΩ2) systems at thermal collision energies. Since the cross sections can be obtained for different orientations of the magnetic field with respect to the relative velocity vector, the model also offers predictions about the frontal-versus-lateral steric asymmetry of the collisions. The steric asymmetry is found to be almost negligible for the He-OH system, weak for the He-CaH collisions, and strong for the He-O2. While odd ΔM transitions dominate the He-OH [J=3/2,f→J′,e/f] integral cross sections in a magnetic field parallel to the relative velocity vector, even ΔM transitions prevail in the case of the He-CaH (X2Σ+) and He-O2 (XΣ−3) collision systems. For the latter system, the magnetic field opens inelastic channels that are closed in the absence of the field. These involve the transitions N=1,J=0→N′, J′ with J′=N′.}, author = {Mikhail Lemeshko and Friedrich, Břetislav}, journal = {Physical Review A - Atomic, Molecular, and Optical Physics}, number = {1}, publisher = {American Physical Society}, title = {{Collisions of paramagnetic molecules in magnetic fields: An analytic model based on Fraunhofer diffraction of matter waves}}, doi = {10.1103/PhysRevA.79.012718}, volume = {79}, year = {2009}, } @article{2150, abstract = {We examine the effects of a linearly polarized nonresonant radiative field on the dynamics of rotationally inelastic Na+ + N2 collisions at eV collision energies. Our treatment is based on the Fraunhofer model of matter wave scattering and its recent extension to collisions in electric fields [M. Lemeshko, B. Friedrich, J. Chem. Phys. 129 (2008) 024301]. The nonresonant radiative field changes the effective shape of the target molecule by aligning it in the space-fixed frame. This markedly alters the differential and integral scattering cross-sections. As the cross-sections can be evaluated for a polarization of the radiative field collinear or perpendicular to the relative velocity vector, the model also offers predictions about steric asymmetry of the collisions.}, author = {Mikhail Lemeshko and Friedrich, Břetislav}, journal = {International Journal of Mass Spectrometry}, number = {1-3}, pages = {19 -- 25}, publisher = {Elsevier}, title = {{The effect of a nonresonant radiative field on low-energy rotationally inelastic Na+ + N2 collisions}}, doi = {10.1016/j.ijms.2008.06.010 }, volume = {280}, year = {2009}, } @article{21513, abstract = {Numerical modelling of the deformation of a polymer using the finite elements method in axisymetrical mode was performed using the LsDyna® software to describe the filling of micro-cavities during the forming process of the material using the hot embossing. These simulations firstly allow verifying whether the chosen forming process conditions promote or not an optimized filling of the superficial cavities in order to achieve precise replicas which best reproduce the superficial topography of the mould. The simulations were carried out to evaluate the filling of the cavities taking into account the mechanical behaviour of the selected polymer into the model. Moreover, these models were developed to verify the effect of the distribution of the mould cavities on their filling. The influence of the mobility of non deformable rigid plates on the filling of the cavities represents an auxiliary variable. In the approach presented, the compression plates are assumed to be parallel and non deformable, whereas the polymer disk follows a rubbery behaviour around a temperature equal to 140°C. Globally the modelling results are satisfactory for they are rather close to the experimental observations conducted. In summary, the effect of the normal stress as also the distribution of micro-cavities at the mould surface seem to prevail in the case of the forming process by hot embossing.}, author = {Sahli, Mohamed and Millot, Christine and Roques-Carmes, Charles and Khan Malek, Chantal}, issn = {1432-1858}, journal = {Microsystem Technologies}, number = {6}, pages = {827--835}, publisher = {Springer Nature}, title = {{Experimental analysis and numerical modelling of the forming process of polypropylene replicas of micro-cavities using hot embossing}}, doi = {10.1007/s00542-009-0813-6}, volume = {15}, year = {2009}, } @article{21514, abstract = {This paper describes observations and metrological analyses made to compare the replication quality of polymeric replicas obtained by filling micro-cavities using both hot embossing and micro-injection moulding processes. The experiments are performed with polypropylene (PP) at a constant melt temperature and a constant mould temperature, whereas hot embossing tests are carried out with the same polymer at temperatures close to the softening one. The results concerning the micro-cavities filling provide information on the reliability about the possibilities of replication topographical surface geometries. The data obtained by scanning mechanical microscopy (SMM) are used to determine the comparative filling ratio values.}, author = {Sahli, M. and Millot, C. and Roques-Carmes, Charles and Khan Malek, C. and Barriere, T. and Gelin, J.C.}, issn = {1873-4774}, journal = {Journal of Materials Processing Technology}, keywords = {Hot embossing, Micro-injection moulding, Micro-cavities replication, Polypropylene polymer, Scanning mechanical microscopy, Roughness parameters}, number = {18-19}, pages = {5851--5861}, publisher = {Elsevier}, title = {{Quality assessment of polymer replication by hot embossing and micro-injection moulding processes using scanning mechanical microscopy}}, doi = {10.1016/j.jmatprotec.2009.06.011}, volume = {209}, year = {2009}, } @article{2191, abstract = {By making use of the quantization rule of Raab and Friedrich [Phys. Rev. A 78, 022707 (2008)], we derive simple and accurate formulae for the number of rotational states supported by a weakly bound vibrational level of a diatomic molecule and the rotational constants of any such levels up to the threshold, and provide a criterion for determining whether a given weakly bound vibrational level is rotationless. The results depend solely on the long-range part of the molecular potential and are applicable to halo molecules. }, author = {Mikhail Lemeshko and Friedrich, Břetislav}, journal = {Physical Review A - Atomic, Molecular, and Optical Physics}, number = {5}, publisher = {American Physical Society}, title = {{Rotational and rotationless states of weakly bound molecules}}, doi = {10.1103/PhysRevA.79.050501}, volume = {79}, year = {2009}, } @article{2192, abstract = {We develop an analytic model of thermal state-to-state rotationally inelastic collisions of asymmetric-top molecules with closed-shell atoms in electric fields and apply it to the Ar-H2O collision system. The predicted cross sections as well as the steric asymmetry of the collisions show at fields up to 150 kV/cm characteristic field-dependent features which can be experimentally tested. Particularly suitable candidates for such tests are the 000 → 220 and 101→ 221 channels, arising from the relaxation of the field-free selection rules due to the hybridization of J states by the field. Averaging over the M' product channels is found to largely obliterate the orientation effects brought about by the field.}, author = {Mikhail Lemeshko and Friedrich, Břetislav}, journal = {Journal of Physical Chemistry A}, number = {52}, pages = {15055 -- 15063}, publisher = {American Chemical Society}, title = {{Model analysis of rotationally inelastic Ar + H2O scattering in an electric field}}, doi = {10.1021/jp9051598}, volume = {113}, year = {2009}, } @article{2193, abstract = {We show that weakly bound molecules can be probed by "shaking" in a pulsed nonresonant laser field. The field introduces a centrifugal term which expels the highest vibrational level from the potential that binds it. Our numerical simulations applied to the Rb2 and KRb Feshbach molecules indicate that shaking by feasible laser pulses can be used to accurately recover the square of the vibrational wave function and, by inversion, also the long-range part of the molecular potential.}, author = {Mikhail Lemeshko and Friedrich, Břetislav}, journal = {Physical Review Letters}, number = {5}, publisher = {American Physical Society}, title = {{Probing weakly bound molecules with nonresonant light}}, doi = {10.1103/PhysRevLett.103.053003}, volume = {103}, year = {2009}, } @article{13414, abstract = {Supraspherical aggregates of crosslinked metal nanoparticles are transformed into pancakes and nanorods by mechanical stresses and shears imparted by macroscopic objects (see image). The dimensions of both types of nanostructures can be controlled by the pressures applied.}, author = {Browne, Kevin P. and Klajn, Rafal and Villa, JulieAnn and Grzybowski, Bartosz A.}, issn = {1613-6829}, journal = {Small}, keywords = {Biomaterials, Biotechnology, General Materials Science, General Chemistry}, number = {23}, pages = {2656--2658}, publisher = {Wiley}, title = {{Mechanofabrication of pancake and rodlike nanostructures from deformable nanoparticle aggregates}}, doi = {10.1002/smll.200900902}, volume = {5}, year = {2009}, } @article{13415, abstract = {Systems in which nanoscale components of different types can be captured and/or released from organic scaffolds provide a fertile basis for the construction of dynamic, exchangeable functional materials. In such heterogeneous systems, the components interact with one another by means of programmable, noncovalent bonding interactions. Herein, we describe polymers that capture and release functionalized nanoparticles selectively during redox-controlled aggregation and disaggregation, respectively. The interactions between the polymer and the NPs are mediated by the reversible formation of polypseudorotaxanes, and give rise to architectures ranging from short chains composed of few nanoparticles to extended networks of nanoparticles crosslinked by the polymer. In the latter case, the polymer/nanoparticle aggregates precipitate from solution such that the polymer acts as a selective ‘sponge’ for the capture/release of the nanoparticles of different types.}, author = {Klajn, Rafal and Olson, Mark A. and Wesson, Paul J. and Fang, Lei and Coskun, Ali and Trabolsi, Ali and Soh, Siowling and Stoddart, J. Fraser and Grzybowski, Bartosz A.}, issn = {1755-4349}, journal = {Nature Chemistry}, keywords = {General Chemical Engineering, General Chemistry}, pages = {733--738}, publisher = {Springer Nature}, title = {{Dynamic hook-and-eye nanoparticle sponges}}, doi = {10.1038/nchem.432}, volume = {1}, year = {2009}, } @article{13416, abstract = {The reversible molecular template-directed self-assembly of gold nanoparticles (AuNPs), a process which relies solely on noncovalent bonding interactions, has been demonstrated by high-resolution transmission electron microscopy (HR-TEM). By employing a well-known host−guest binding motif, the AuNPs have been systemized into discrete dimers, trimers, and tetramers. These nanoparticulate twins, triplets, and quadruplets, which can be disassembled and reassembled either chemically or electrochemically, can be coalesced into larger, permanent polygonal structures by thermal treatment using a focused HR-TEM electron beam.}, author = {Olson, Mark A. and Coskun, Ali and Klajn, Rafal and Fang, Lei and Dey, Sanjeev K. and Browne, Kevin P. and Grzybowski, Bartosz A. and Stoddart, J. Fraser}, issn = {1530-6992}, journal = {Nano Letters}, keywords = {Mechanical Engineering, Condensed Matter Physics, General Materials Science, General Chemistry, Bioengineering}, number = {9}, pages = {3185--3190}, publisher = {American Chemical Society}, title = {{Assembly of polygonal nanoparticle clusters directed by reversible noncovalent bonding interactions}}, doi = {10.1021/nl901385c}, volume = {9}, year = {2009}, } @article{13417, abstract = {Mission Impossible: Metal nanoparticles (NPs) coated with photoresponsive ligands are used as “inks” for self-erasing “paper” whereby light-induced self-assembly of the NPs is transduced into local color changes (see picture). Depending on the degree of self-assembly, multicolor images can be written using only one type of NP ink. Duration of image erasure is regulated by the surface concentration of photoactive groups and can range from seconds to days.}, author = {Klajn, Rafal and Wesson, Paul J. and Bishop, Kyle J. M. and Grzybowski, Bartosz A.}, issn = {1521-3773}, journal = {Angewandte Chemie International Edition}, keywords = {General Chemistry, Catalysis}, number = {38}, pages = {7035--7039}, publisher = {Wiley}, title = {{Writing self-erasing images using metastable nanoparticle “inks”}}, doi = {10.1002/anie.200901119}, volume = {48}, year = {2009}, }