Photosystem I (PS-I) contains a small fraction of chlorophylls (Chls) that absorb at wavelengths longer than the primary electron donor P700. The total number of these long wavelength Chls and their spectral distribution are strongly species dependent. In this contribution we present room temperature time-resolved fluorescence data of five PS-I core complexes that contain different amounts of t...

Templated self-assembly of block copolymers using topographic templates is attractive because it can generate dense nanoscale patterns over a large area with a periodicity down to 10 nm. In our previous work, regular patterns were achieved by using a polystyrene-bpolydimethylsiloxane (PS-b-PDMS) block copolymer and topographic templates . However, more complex block-copolymer patterns required ...

The preparation of well-defined block copolymers using controlled radical polymerization depends on the proper order of monomer addition. The reversed order of monomer addition results in a mixture of block copolymer and homopolymer and thus has typically been avoided. In this paper, the low blocking efficiency of reversed monomer addition order is utilized in combination with surface initiated...

Poly(styrene)-b-poly(N-isopropylacrylamide) (PS-b-PNIPAM) amphiphilic diblock copolymers were synthesized via reverse iodine transfer polymerization (RITP) firstly. And then the honeycomb structured porous films were fabricated by drop the amphiphilic diblock copolymer solutions on glass substrates. The porous films were characterized using field emission scanning electron microscopy (FESEM) an...

An efficient protocol for the hydrophosphonylation of aromatic and aliphatic aldehydes catalyzed by PS-BEMP under solvent-free conditions (SolFC) has been reported. Addition reactions were performed by using equimolar amounts of reagents and the resulting α-hydroxyphosphonates were isolated with simple workup procedures. A large scale protocol for the preparation of a representative α-hydroxyph...

Positronium decays into two and three photons provide an interesting test of bound states Quantum Electrodynamics (QED). While the parapositronium (p-Ps) decay rate is well described by QED, it is known that the decay of orthopositronium (o-Ps) into three photons is still a controversial issue [1]. However, on the theoretical side there has been a major breakthrough recently and both decay rate...

We have shown that activation of nuclear factor-kB (NF-kB) promotes cell survival and expression of cytokines such as growth-regulated oncogene-a, which can modulate angiogenesis, growth, and metastasis of squamous cell carcinoma (SCC). Activation of NF-kB and cytoprotective genes in cancer may result from signal-induced phosphorylation and proteasome-dependent degradation of inhibitorkB. In th...