抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Surface plasmons are waves that propagate along the surface of a conductor. By altering the structure of a metal's surface, the properties of surface plasmons--in particular their interaction with light--can be tailored, which offers the potential for developing new types of photonic device. This could lead to miniaturized photonic circuits with length scales that are much smaller than those currently achieved. Surface plasmons are being explored for their potential in subwavelength optics, data storage, light generation, microscopy and bio-photonics.

/pdf/surface-plasmon-subwavelength-optics-5e55p12p4o.pdf

Surface plasmon subwavelength optics

We present experimental scattering data at microwave frequencies on a structured metamaterial that exhibits a frequency band where the effective index of refraction (n) is negative. The material consists of a two-dimensional array of repeated unit cells of copper strips and split ring resonators on interlocking strips of standard circuit board material. By measuring the scattering angle of the transmitted beam through a prism fabricated from this material, we determine the effective n, appropriate to Snell's law. These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root of epsilon.mu for the frequencies where both the permittivity (epsilon) and the permeability (mu) are negative. Configurations of geometrical optical designs are now possible that could not be realized by positive index materials.

/pdf/experimental-verification-of-a-negative-index-of-refraction-37hlxn3tta.pdf

Experimental Verification of a Negative Index of Refraction

We show that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu//sub eff/, which can be tuned to values not accessible in naturally occurring materials, including large imaginary components of /spl mu//sub eff/. The microstructure is on a scale much less than the wavelength of radiation, is not resolved by incident microwaves, and uses a very low density of metal so that structures can be extremely lightweight. Most of the structures are resonant due to internal capacitance and inductance, and resonant enhancement combined with compression of electrical energy into a very small volume greatly enhances the energy density at critical locations in the structure, easily by factors of a million and possibly by much more. Weakly nonlinear materials placed at these critical locations will show greatly enhanced effects raising the possibility of manufacturing active structures whose properties can be switched at will between many states.

/pdf/magnetism-from-conductors-and-enhanced-nonlinear-phenomena-2fpnoamwae.pdf

Magnetism from conductors and enhanced nonlinear phenomena

The emerging field of plasmonics has yielded methods for guiding and localizing light at the nanoscale, well below the scale of the wavelength of light in free space. Now plasmonics researchers are turning their attention to photovoltaics, where design approaches based on plasmonics can be used to improve absorption in photovoltaic devices, permitting a considerable reduction in the physical thickness of solar photovoltaic absorber layers, and yielding new options for solar-cell design. In this review, we survey recent advances at the intersection of plasmonics and photovoltaics and offer an outlook on the future of solar cells based on these principles.

Plasmonics for improved photovoltaic devices

A theoretical study of poisoning in heterogeneous catalysis; discussion of the role of electronegativity and a comparison with experimental results of Goodman et al. on CO adsorption and methanation on Ni(100)

We calculate for the first time the distribution of energy widths for Anderson localized states at a surface and show that electrical noise is produced with a $\frac{1}{f}$ spectrum. The distribution has a natural cut-off at widths of $\frac{\ensuremath{\hbar}}{{l}_{c}}$, where ${l}_{c}\ensuremath{\propto}\mathrm{exp}(\frac{{\ensuremath{\delta}}^{\ensuremath{'}2}L}{2})$ and ${\ensuremath{\delta}}^{\ensuremath{'}2}$ measures the disorder; ${l}_{c}$ is typically many hours. The scanning tunneling microscope is proposed as the ideal device for observing these fluctuations.

Electrons at disordered surfaces and 1/f noise.

We present a general framework for the homogenisation theory of space-time metamaterials. By mapping to a frame co-moving with the space-time modulation, we derive analytical formulae for the effective material parameters for travelling wave modulations in the low frequency limit: electric permittivity, magnetic permeability and magnetoelectric coupling. Remarkably, we show that the theory is exact at all frequencies in the absence of back-reflections, and exact at low frequencies when that condition is relaxed. This allows us to derive exact formulae for the Fresnel drag experienced by light travelling through travelling-wave modulations of electromagnetic media.

Homogenisation Theory of Space-Time Metamaterials

The clean and H-induced reconstruction of W(100) studied by LEED at slanting primary bean incidence

The transfer matrix approach, so successful in handling disorder in 1D systems, is extended to 3D. A simple model is discussed which shows a mobility edge whose position can be predicted by a simple formula. A key role is played by the correlated propagation through the system of odd numbers of density fluctuations, from N=3 upwards.

http://iopscience.iop.org/article/10.1088/0022-3719/17/30/008/pdf

John B. Pendry

Papers

A theoretical study of poisoning in heterogeneous catalysis; discussion of the role of electronegativity and a comparison with experimental results of Goodman et al. on CO adsorption and methanation on Ni(100)

Electrons at disordered surfaces and 1/f noise.

Homogenisation Theory of Space-Time Metamaterials

The clean and H-induced reconstruction of W(100) studied by LEED at slanting primary bean incidence

A transfer matrix approach to localisation in 3D