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Rapid alkalinization factor 22 has a structural and signalling role in root hair cell wall assembly Universiteit Antwerpen
Pressurized cells with strong walls make up the hydrostatic skeleton of plants. Assembly and expansion of such stressed walls depend on a family of secreted RAPID ALKALINIZATION FACTOR (RALF) peptides, which bind both a membrane receptor complex and wall-localized LEUCINE-RICH REPEAT EXTENSIN (LRXs) in a mutually exclusive way. Here we show that, in root hairs, the RALF22 peptide has a dual structural and signalling role in cell expansion. ...
The design and physical modelling of deployable structures based on curved-line folding Vrije Universiteit Brussel
Curved-line folding is the act of folding paper along a curved crease pattern in order to create a 3D shape, using the combination of folding (plastic deformation) and bending (elastic deformation). Up until now, the use of curved- line folding in architecture has been limited to static applications only, such as metal sculptures or façade panels. However, the elastic deformations that occur when a flat sheet is forced into a curved shape can ...
Transformable structures: materialising design for change Vrije Universiteit Brussel
Living in an age of rapid changes, designers are challenged to create solutions that remain sustainable in a continuously evolving environment. Since most of our earth's resources are finite, these solutions should incorporate efficient material use and reuse. Buildings and structures are always in transition. Facilitating these transformations is vital to the sustainable development of our built environment. With our group we study, develop ...
Lightweight transformable structures: materialising the synergy between architectural and structural engineering Vrije Universiteit Brussel
As opposed to conventional, static structures, transformable structures possess a transformational capacity enabling them to efficiently respond to altered boundary conditions, such as climatic conditions, different locations, varying functional requirements, or emergency situations. Generally, this capacity is provided through built-in mobility (structural mechanisms) or by means of assembly/disassembly of its constitutive members (kit-of-parts ...
Bending-active reciprocal structures: geometric parameters and their stiffening effect Vrije Universiteit Brussel
Bending-active reciprocal structures consist of elastically bent beams in a mutually supporting weave pattern in which each connection joins only two beams. Aside from the advantages for fabrication and assembly, this system has an extensive geometric potential, allowing reuse and reconfiguration. However, the load-bearing behaviour of these structures is limited by the required flexibility of the components. This paper discusses the impact of ...
Third generation sequencing and herpesvirus diversity: Towards complete double-stranded DNA virus genomes KU Leuven
Viral variability can be understood as genetic differences between nucleotide sequences. It can be used to define viral taxonomic units (species, genera, class, or family), viral subgroups, strains or life-cycle stages (lytic and latent phases). Viral diversity has been extensively studied, mostly through second-generation sequencing techniques, such as IonTorrent or Illumina sequencing. In the last years, third-generation technologies, such as ...
Transformable active bending: a kinematical concept Vrije Universiteit Brussel
Transformable structures facilitate reuse of components and structures by increasing the speed and ease of erection and lowering the stacking volume during transportation. Thanks to its unique ability to use structural members under different curvatures and return bent elements to their initial straight or planar geometry, active bending has the potential to expand the existing morphology of transformable structures. This paper discusses the ...
Novel Insights Into Intermediate Filament Assembly Through Chemical Cross-Linking KU Leuven
Intermediate filaments (IFs) are essential constituents of the metazoan cytoskeleton. There are over 70 distinct IF proteins in humans linked to specific tissues and functions. IF proteins are capable of self-assembly into typical 10-12 nm wide filaments. The primary structure of all IF proteins includes the signature central 'rod' domain of ~300 residues which forms a dimeric α-helical coiled-coil (CC) composed of three segments (coil1A, coil1B ...
Evaluation of design parameters for deployable planar scissor arches Vrije Universiteit Brussel
Deployable scissor structures can transform from a compact bundle of elements to a fully expanded configuration. Due to this transformational capacity there is a mutual relation between the geometry, the kinematics and the structural response of the scissor system, resulting in a relatively complex design process. In order to understand how geometrical parameters influence the structural performance, it is beneficial to evaluate these structures ...