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[en] Serum protein comprising specific binding proteins such as antibodies, B12 intrinsic factor, thyroxin binding globulin and the like may be copolymerized with globulin constituents of serum by the action of ethylchloroformate to form readily packed insoluble precipitates which, following purification as by washing, are eminently suited for employment as competitive binding protein absorbents in radioassay procedures. 10 claims, no drawings
[en] Polydimethylsiloxane (PDMS) is widely used in bioMEMS applications; however, patterning of this material to form complex structures is often challenging. Chemical etches are typically ineffective due to the inertness of the material. Plasma processing of bulk material can be time intensive and presents concerns regarding the mechanical properties of the post-etched polymer due to etch-induced cross-linking of surrounding material. Presented in this paper, the etchless process of spun-cast micromolding (SCμM) is used to create an array of patterned, PDMS, electrical microcables. The microcables are arranged in a net-like array and incorporate electrical functionality. The geometries fabricated with these techniques include straight and sinusoidal microcables. In addition to the cables themselves, specific regions of the cables' top insulating layer can also be patterned using a hierarchical application of the SCμM process, creating exposed electrical access sites useful as electrical access points for electrophysiological applications. The SCμM process is a simple, relatively rapid technique that can be used to make highly compliant electronic structures with patternable geometries. (technical note)
[en] The formation and mechanical properties of a polymer network on and between two flat parallel surfaces are investigated. Most treatments of surface-attached polymers have been limited to scaling theory. In the present investigation we probe the physics of the system by means of a mathematical description of the random crosslinking of ideal (or phantom) chains. We modify an existing bulk model of network formation by Deam and Edwards, with polymer-polymer crosslinks, to include surfaces and polymer-surface crosslinks. We investigate two variations of this model: in the first place, the polymer-surface links are formed anywhere along the contours of the long, ideal polymer chains. In the second brush network model, the surface links are restricted to one endpoint of each macromolecule. Within the framework of replica theory, we compute statistical averages and the elastic properties of the systems such as the stress-strain relationship. In both cases the elastic modulus of the bulk network is altered, and has a characteristic form due to the confinement. Furthermore, we find that the stress-strain relationship depends on the manner of crosslinking
[en] Highlights: • Theoretical study on the formation process of Cross-Linked β-Cyclodextrin molecular tubes. • Semi-empirical and DFT calculations were performed. • The β-CD molecular tube in TT orientation with 3 cross-linking is the most stable. This paper reports a theoretical investigation using semiempirical and DFT calculations in order to evaluate structural and energetic properties related to the formation process of Cross-Linked β-Cyclodextrin molecular tubes. As result, TT spatial orientation was found to be the most favorable among the dimeric tubes. The overall stability order, TT > HH > HT, does not change with the number of cross-linking groups. Besides, we have shown that tubes with 3 cross-linking in their structures are the most stable ones due to steric and repulsion factors which is in perfect agreement with experimental data.