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排序方式: 共有66条查询结果,搜索用时 62 毫秒
31.
Douglas M. Ackermann Jr. David N. Jewell Matthew L. Stedman Vorakan Burapatana Prabhani V. Atukorale Michelle L. Pinson Alison E. Wardle Wenyan Zhu Robert D. Tanner 《Applied biochemistry and biotechnology》2003,107(1-3):659-671
Protein foams can be used to extinguish fires. If foams are to be used to extinguish fires where people are present, such
as in high-rise buildings or ships, then a method for allowing people to breathe in a foam-filled environment is needed. It
is proposed that the air, used to create the foam be used for breathing. A canister that will break incoming air-filled foam
has been designed for attachment to a standard gas mask, in order to provide breathable air to a trapped person. Preliminary
results for the modified mask indicate feasibility of breathing air from air-filled protein foam. 相似文献
32.
Ken Jewell 《Topology and its Applications》2008,155(7):733-747
Let A be a subspace arrangement in V with a designated maximal affine subspace A0. Let A′=A?{A0} be the deletion of A0 from A and A″={A∩A0|A∩A0≠∅} be the restriction of A to A0. Let M=V??A∈AA be the complement of A in V. If A is an arrangement of complex affine hyperplanes, then there is a split short exact sequence, 0→Hk(M′)→Hk(M)→Hk+1−codimR(A0)(M″)→0. In this paper, we determine conditions for when the triple (A,A′,A″) of arrangements of affine subspaces yields the above split short exact sequence. We then generalize the no-broken-circuit basis nbc of Hk(M) for hyperplane arrangements to deletion-restriction subspace arrangements. 相似文献
33.
T. Suomijärvi J. H. Kelley S. E. Hirzebruch A. Azhari D. Bazin Y. Blumenfeld J. A. Brown P. D. Cottle S. Danczyk M. Fauerbach T. Glasmacher J. K. Jewell K. W. Kemper F. Maréchal D. J. Morrissey S. Ottini J. A. Scarpaci P. Thirolf 《Acta Physica Hungarica A》1997,6(1-4):177-187
The proton scattering on unstable38S nuclei has been measured in inverse kinematics by using a38S secondary beam at 39 MeV/nucleon. The first 2+ state is seen at 1.2 MeV excitation energy and its angular distribution is extracted. Optical and folding model calculations are compared with the elastic and the 2 1 + angular distributions and the β2 value is determined to be 0.35±0.04. This value is compared with the corresponding result from a Coulomb excitation measurement and theM n/Mp value is extracted. 相似文献
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Jewell AD Kyran SJ Rabinovich D Sykes EC 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(23):7169-7178
Surface molecular self-assembly is a fast advancing field with broad applications in sensing, patterning, device assembly, and biochemical applications. A vast number of practical systems utilize alkane thiols supported on gold surfaces. Whereas a strong Au-S bond facilitates robust self-assembly, the interaction is so strong that the surface is reconstructed, leaving etch pits that render the monolayers susceptible to degradation. By using different head group elements to adcust the molecule-surface interaction, a vast array of new systems with novel properties may be formed. In this paper we use a carefully chosen set of molecules to make a direct comparison of the self-assembly of thioether, selenoether, and phosphine species on Au(111). Using the herringbone reconstruction of gold as a sensitive readout of molecule-surface interaction strength, we correlate head-group chemistry with monolayer (ML) properties. It is demonstrated that the hard/soft rules of inorganic chemistry can be used to rationalize the observed trend of molecular interaction strengths with the soft gold surface, that is, P>Se>S. We find that the structure of the monolayers can be explained by the geometry of the molecules in terms of dipolar, quadrupolar, or van der Waals interactions between neighboring species driving the assembly of distinct ordered arrays. As this study directly compares one element with another in simple systems, it may serve as a guide for the design of self-assembled monolayers with novel structures and properties. 相似文献
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Flessner RM Jewell CM Anderson DG Lynn DM 《Langmuir : the ACS journal of surfaces and colloids》2011,27(12):7868-7876
We report an approach to the design of degradable polyelectrolyte-based films for the controlled release of siRNA from surfaces. Our approach is based on stepwise, layer-by-layer assembly of multilayered polyelectrolyte films (or "polyelectrolyte multilayers", PEMs) using siRNA and a hydrolytically degradable poly(β-amino ester) (polymer 1). Fabrication of films using siRNA sequences for green fluorescent protein (GFP) or firefly luciferase resulted in linear growth of ultrathin films (~50 nm thick) that promoted the surface-mediated release of siRNA upon incubation in physiologically relevant media. Physicochemical characterization of these siRNA-containing films revealed large differences in film growth profiles, physical erosion profiles, and siRNA release profiles as compared to PEMs fabricated using polymer 1 and larger plasmid DNA constructs. For example, whereas films fabricated using plasmid DNA erode gradually and release DNA over a period of ~48 h, films fabricated using siRNA released ~65% of incorporated siRNA within the first hour of incubation, prior to the onset of any observed film erosion. This initial burst of release was followed by a second, slower phase of release (accompanied by gradual film erosion) over the next 23 h. These differences in release profiles and other behaviors likely result, at least in part, from large differences in the sizes of siRNA and plasmid DNA. Finally, we demonstrate that the siRNA in these films is released in a form that remains intact, functional, and able to silence targeted protein expression upon administration to mammalian cells in vitro. The results of this investigation provide a platform for the design of thin films and coatings that could be used to localize the release of siRNA from surfaces in a variety of fundamental and applied contexts (e.g., for development of new research tools or approaches to delivery from film-coated implants and other devices). 相似文献
40.
Erin V. Iski April D. Jewell Heather L. Tierney Georgios Kyriakou E. Charles H. Sykes 《Surface science》2012,606(3-4):536-541
Organic thin films composed of naphtho[2,3-a]pyrene, a very promising multifunctional polyaromatic hydrocarbon for use in optoelectronic devices, are demonstrated to restructure the pristine Au(111) 22 × √3 surface. The perturbation of the herringbone reconstruction was used to gauge the interaction strength of the organic molecule with the substrate through a series of controlled adsorption and annealing treatments. The overall behavior of the system is interpreted as an interplay between thermodynamic and kinetic factors, dictated by the temperature of the sample and the surface coverage of the molecules. The restructuring mechanism involves the exchange of Au atoms from the herringbone reconstruction to the step edges. Our results reveal that the molecular and substrate equilibrium structure is only achieved after annealing the system to > 470 K. This infers that caution should be taken when organic–metal interfaces are constructed by low or room temperature deposition, as they may not correspond to the equilibrium structures, and therefore, may misrepresent the adlayer structure which exists at the realistic working conditions of devices. 相似文献