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article

Modular robotic systems: Methods and algorithms for abstraction, planning, control, and synchronization

Hossein Ahmadzadeh, Ellips Masehian, H. Ahmadzadeh, E. Masehian

Artificial Intelligence > 2015 > 223 > Complete > 27-64

While expected applications of Modular Robotic Systems (MRS) span various workspaces, scales, and structures, practical implementations of such systems lag behind their potentials in performing real-world tasks. Challenges of enhancing MRS capabilities not only are limited to designing reliable, responsive, and robust hardware, but also include developing software and algorithms that can effectively...

article

Structure analysis of layer-by-layer multilayer films of colloidal particles

Piotr Batys, Magdalena Nosek, Paweł Weroński, P. Batys, more

Applied Surface Science > 2015 > 332 > Complete > 318-327

We have mimicked the layer-by-layer self-assembling process of monodisperse colloidal particles at a solid–liquid interface using the extended random sequential adsorption model of hard spheres. We have studied five multilayer structures of similar thickness, each created at a different single-layer surface coverage. For each multilayer, we have determined its particle volume fraction as a function...

article

Slightly broken icosahedral symmetry advances Thomson problem

D.S. Roshal, A.E. Myasnikova, S.B. Rochal, D.S. Roshal, more

Physics Letters A > 2015 > 379 > 4 > 372-376

To advance Thomson problem we generalize physical principles suggested by Caspar and Klug (CK) to model icosahedral capsids. Proposed simplest distortions of the CK spherical arrangements yield new-type trial structures very close to the lowest energy ones. In the region 600≤N≤1000, where N is the number of particles in the structure, we found 40 new spherical crystals with the lowest ever seen energies...

article

Nano-niosomes as nanoscale drug delivery systems: An illustrated review

Saeid Moghassemi, Afra Hadjizadeh, S. Moghassemi, A. Hadjizadeh

Journal of Controlled Release > 2014 > 185 > Complete > 22-36

The field of nanochemistry research has shown a great progress in the developing of novel nanocarriers as potential drug delivery systems. Niosome is a class of molecular cluster formed by self-association of non-ionic surfactants in an aqueous phase. The unique structure of niosome presents an effective novel drug delivery system (NDDS) with ability of loading both hydrophilic and lipophilic drugs...

article

Incorporation of isolated Ti sites into mesoporous silica thin films by sugar surfactant complexation

Mohammed Shahidur Rahman, Jyothirmai Ambati, Suvid Joshi, Stephen E. Rankin, more

Microporous and Mesoporous Materials > 2014 > 190 > Complete > 74-83

One of the challenges in transition metal heterogeneous catalysis is the generation of supports with well-defined porosity containing transition metal sites of uniform coordination, complexity, and spacing. For instance, tetrahedrally coordinated titanium atoms incorporated into a silica network are believed to be the active oxidation sites for heterogeneous epoxidation catalysis. Sol–gel chemistry...

article

Controllable metal-enhanced fluorescence in organized films and colloidal system

Qianling Cui, Fang He, Lidong Li, Helmuth Möhwald, more

Advances in Colloid and Interface Science > 2014 > 207 > Complete > 164-177

In recent years, considerable efforts have been devoted to better understand the unique emission properties of fluorophores enhanced by the localized surface plasmon resonance of metal nanoparticles (NPs), due to the widespread applications of fluorescence techniques. It is demonstrated by experiment and theoretical calculation that the enhancement efficiency strongly depends on the morphology of...

article

From self-assembly fundamental knowledge to nanomedicine developments

Maura Monduzzi, Sandrina Lampis, Sergio Murgia, Andrea Salis, more

Advances in Colloid and Interface Science > 2014 > 205 > Complete > 48-67

This review highlights the key role of NMR techniques in demonstrating the molecular aspects of the self-assembly of surfactant molecules that nowadays constitute the basic knowledge which modern nanoscience relies on. The aim is to provide a tutorial overview.The story of a rigorous scientific approach to understand self-assembly in surfactant systems and biological membranes starts in the early...

article

Antireflective sub-wavelength structures on fused silica via self-assembly of silica

Ying Du, Meiping Zhu, Zhan Sui, Kui Yi, more

Thin Solid Films > 2013 > 548 > Complete > 103-108

Antireflective sub-wavelength structures with high laser-induced damage threshold on fused silica are fabricated using a self-assembly technique, in which a porous yttrium oxide film is deposited as a mask followed by alkaline etching. By controlling the etching time, several sub-wavelength structures with different height, density and diameter have been made. The best reflectance is less than 2.87%...

article

Programmable 3D Hexagonal Geometry of DNA Tensegrity Triangles

Brandon Lu, Karol Woloszyn, Yoel P. Ohayon, Bena Yang, more

Angewandte Chemie > 135 > 6 > n/a - n/a

Non‐canonical interactions in DNA remain under‐explored in DNA nanotechnology. Recently, many structures with non‐canonical motifs have been discovered, notably a hexagonal arrangement of typically rhombohedral DNA tensegrity triangles that forms through non‐canonical sticky end interactions. Here, we find a series of mechanisms to program a hexagonal arrangement using: the sticky end sequence; triangle...

article

Programmable 3D Hexagonal Geometry of DNA Tensegrity Triangles

Brandon Lu, Karol Woloszyn, Yoel P. Ohayon, Bena Yang, more

Angewandte Chemie International Edition > 62 > 6 > n/a - n/a

Non‐canonical interactions in DNA remain under‐explored in DNA nanotechnology. Recently, many structures with non‐canonical motifs have been discovered, notably a hexagonal arrangement of typically rhombohedral DNA tensegrity triangles that forms through non‐canonical sticky end interactions. Here, we find a series of mechanisms to program a hexagonal arrangement using: the sticky end sequence; triangle...

article

Strong Coupling of Chiral Frenkel Exciton for Intense, Bisignate Circularly Polarized Luminescence

Minghao Li, Shahana Nizar, Sudipta Saha, Anoop Thomas, more

Angewandte Chemie > 135 > 6 > n/a - n/a

We show that chiral Frenkel excitons yield intense circularly polarized luminescence with an intrinsic dissymmetry factor in emission g_lum as high as 0.08. This outstanding value is measured through thin films of cyanine J‐aggregates that form twisted bundles. Our measurements, obtained by a Mueller polarization analysis, are artifact‐free and reveal a quasi‐perfect correlation between the dissymmetry...

article

Strong Coupling of Chiral Frenkel Exciton for Intense, Bisignate Circularly Polarized Luminescence

Minghao Li, Shahana Nizar, Sudipta Saha, Anoop Thomas, more

Angewandte Chemie International Edition > 62 > 6 > n/a - n/a

We show that chiral Frenkel excitons yield intense circularly polarized luminescence with an intrinsic dissymmetry factor in emission g_lum as high as 0.08. This outstanding value is measured through thin films of cyanine J‐aggregates that form twisted bundles. Our measurements, obtained by a Mueller polarization analysis, are artifact‐free and reveal a quasi‐perfect correlation between the dissymmetry...

article

Persistent ATP‐Concentration Gradients in a Hydrogel Sustained by Chemical Fuel Consumption

Yingjuan Cao, Luca Gabrielli, Diego Frezzato, Leonard J. Prins

Angewandte Chemie International Edition > 62 > 4 > n/a - n/a

We show the formation of macroscopic ATP‐concentrations in an agarose gel and demonstrate that these gradients can be sustained in time at the expense of the consumption of a chemical fuel. The approach relies on the spatially controlled activation of ATP‐producing and ATP‐consuming reactions through the local injection of enzymes in the matrix. The reaction‐diffusion system is maintained in a stationary...

article

Persistent ATP‐Concentration Gradients in a Hydrogel Sustained by Chemical Fuel Consumption

Yingjuan Cao, Luca Gabrielli, Diego Frezzato, Leonard J. Prins

Angewandte Chemie > 135 > 4 > n/a - n/a

We show the formation of macroscopic ATP‐concentrations in an agarose gel and demonstrate that these gradients can be sustained in time at the expense of the consumption of a chemical fuel. The approach relies on the spatially controlled activation of ATP‐producing and ATP‐consuming reactions through the local injection of enzymes in the matrix. The reaction‐diffusion system is maintained in a stationary...

article

Inside Back Cover: Self‐Assembled Peptidyl Aggregates for the Fluorogenic Recognition of Mitochondrial DNA G‐Quadruplexes (Angew. Chem. Int. Ed. 3/2023)

Anup Pandith, Yongyang Luo, Yul Jang, Jeehyeon Bae, more

Angewandte Chemie International Edition > 62 > 3 > n/a - n/a

A self‐assembled peptidyl fluorogenic probe (CV2) able to selectively light up parallel G4 DNA over antiparallel topologies is presented by Jeehyeon Bae, Youngmi Kim, and co‐workers in their Research Article (e202215049). CV2 allows for the selective staining of G4s in mitochondria over the nucleus in living cells and is further employed for tracking the folding and unfolding of G4s in living cells,...

article

Polyphosphinoborane Block Copolymer Synthesis Using Catalytic Reversible Chain‐Transfer Dehydropolymerization

James J. Race, Alex Heyam, Matthew A. Wiebe, J. Diego‐Garcia Hernandez, more

Angewandte Chemie International Edition > 62 > 3 > n/a - n/a

An amphiphilic block copolymer of polyphosphinoborane has been prepared by a mechanism‐led strategy of the sequential catalytic dehydropolymerization of precursor monomers, H₃B ⋅ PRH₂ (R=Ph, n‐hexyl), using the simple pre‐catalyst [Rh(Ph₂PCH₂CH₂PPh₂)₂]Cl. Speciation, mechanism and polymer chain growth studies support a step‐growth process where reversible chain transfer occurs, i.e. H₃B ⋅ PRH₂/oligomer/polymer...

article

Self‐Assembled Peptidyl Aggregates for the Fluorogenic Recognition of Mitochondrial DNA G‐Quadruplexes

Anup Pandith, Yongyang Luo, Yul Jang, Jeehyeon Bae, more

Angewandte Chemie International Edition > 62 > 3 > n/a - n/a

The selective monitoring of G‐quadruplex (G4) structures in living cells is important to elucidate their functions and reveal their value as diagnostic or therapeutic targets. Here we report a fluorogenic probe (CV2) able to selectively light‐up parallel G4 DNA over antiparallel topologies. CV2 was constructed by conjugating the excimer‐forming CV dye with a peptide sequence (l‐Arg‐l‐Gly‐glutaric...

article

Innenrücktitelbild: Self‐Assembled Peptidyl Aggregates for the Fluorogenic Recognition of Mitochondrial DNA G‐Quadruplexes (Angew. Chem. 3/2023)

Anup Pandith, Yongyang Luo, Yul Jang, Jeehyeon Bae, more

Angewandte Chemie > 135 > 3 > n/a - n/a

A self‐assembled peptidyl fluorogenic probe (CV2) able to selectively light up parallel G4 DNA over antiparallel topologies is presented by Jeehyeon Bae, Youngmi Kim, and co‐workers in their Research Article (e202215049). CV2 allows for the selective staining of G4s in mitochondria over the nucleus in living cells and is further employed for tracking the folding and unfolding of G4s in living cells,...

article

Polyphosphinoborane Block Copolymer Synthesis Using Catalytic Reversible Chain‐Transfer Dehydropolymerization

James J. Race, Alex Heyam, Matthew A. Wiebe, J. Diego‐Garcia Hernandez, more

Angewandte Chemie > 135 > 3 > n/a - n/a

An amphiphilic block copolymer of polyphosphinoborane has been prepared by a mechanism‐led strategy of the sequential catalytic dehydropolymerization of precursor monomers, H₃B ⋅ PRH₂ (R=Ph, n‐hexyl), using the simple pre‐catalyst [Rh(Ph₂PCH₂CH₂PPh₂)₂]Cl. Speciation, mechanism and polymer chain growth studies support a step‐growth process where reversible chain transfer occurs, i.e. H₃B ⋅ PRH₂/oligomer/polymer...

article

Self‐Assembled Peptidyl Aggregates for the Fluorogenic Recognition of Mitochondrial DNA G‐Quadruplexes

Anup Pandith, Yongyang Luo, Yul Jang, Jeehyeon Bae, more

Angewandte Chemie > 135 > 3 > n/a - n/a

The selective monitoring of G‐quadruplex (G4) structures in living cells is important to elucidate their functions and reveal their value as diagnostic or therapeutic targets. Here we report a fluorogenic probe (CV2) able to selectively light‐up parallel G4 DNA over antiparallel topologies. CV2 was constructed by conjugating the excimer‐forming CV dye with a peptide sequence (l‐Arg‐l‐Gly‐glutaric...

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Search results

Modular robotic systems: Methods and algorithms for abstraction, planning, control, and synchronization

Structure analysis of layer-by-layer multilayer films of colloidal particles

Slightly broken icosahedral symmetry advances Thomson problem

Nano-niosomes as nanoscale drug delivery systems: An illustrated review

Incorporation of isolated Ti sites into mesoporous silica thin films by sugar surfactant complexation

Controllable metal-enhanced fluorescence in organized films and colloidal system

From self-assembly fundamental knowledge to nanomedicine developments

Antireflective sub-wavelength structures on fused silica via self-assembly of silica

Programmable 3D Hexagonal Geometry of DNA Tensegrity Triangles

Programmable 3D Hexagonal Geometry of DNA Tensegrity Triangles

Strong Coupling of Chiral Frenkel Exciton for Intense, Bisignate Circularly Polarized Luminescence

Strong Coupling of Chiral Frenkel Exciton for Intense, Bisignate Circularly Polarized Luminescence

Persistent ATP‐Concentration Gradients in a Hydrogel Sustained by Chemical Fuel Consumption

Persistent ATP‐Concentration Gradients in a Hydrogel Sustained by Chemical Fuel Consumption

Inside Back Cover: Self‐Assembled Peptidyl Aggregates for the Fluorogenic Recognition of Mitochondrial DNA G‐Quadruplexes (Angew. Chem. Int. Ed. 3/2023)

Polyphosphinoborane Block Copolymer Synthesis Using Catalytic Reversible Chain‐Transfer Dehydropolymerization

Self‐Assembled Peptidyl Aggregates for the Fluorogenic Recognition of Mitochondrial DNA G‐Quadruplexes

Innenrücktitelbild: Self‐Assembled Peptidyl Aggregates for the Fluorogenic Recognition of Mitochondrial DNA G‐Quadruplexes (Angew. Chem. 3/2023)

Polyphosphinoborane Block Copolymer Synthesis Using Catalytic Reversible Chain‐Transfer Dehydropolymerization

Self‐Assembled Peptidyl Aggregates for the Fluorogenic Recognition of Mitochondrial DNA G‐Quadruplexes

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