Chemical constituents from the fruiting bodies of Phellinus igniarius

A new tirucallane-type triterpenoid igniarine (1), and four known compounds meshimakobnol A (2), meshimakobnol B (3), ergosterol (4) and ergosterol peroxide (5), were purified from the methanol extracts of the fruiting bodies of Phellinus igniarius (DC. ex Fr.) Quél. The structure of 1 was elucidated using a combination of 1D and 2D NMR techniques and HR-ESI-MS analyses. In addition, the isolated compounds were examined for their cytotoxicity against several tumour cell lines and part of the tested compounds demonstrated weak cytotoxicity.     

On the low-lying triplet of the water molecule and its luminescent decay

Due to a significant discrepancy between theoretical calculations and experimental excitation data, the position of the low-lying triplet state of water has been much debated in recent years. We now report that the corresponding transition (≈ 4.0 eV) can be observed also in emission upon charge neutralization in γ-irradiated ordinary and heavy ices and also by photosensitization from the mercury ³P₁ or ³P₀ state. The observed radiative decay is characterized by an emission λ_max at 380–385 nm.     

Soft lithography using acryloxy perfluoropolyether composite stamps

This paper describes composite patterning elements that use a commercially available acryloxy perfluoropolyether (a-PFPE) in various soft lithographic techniques, including microcontact printing, nanotransfer printing, phase-shift optical lithography, proximity field nanopatterning, molecular scale soft nanoimprinting, and solvent assisted micromolding. The a-PFPE material, which is similar to a methacryloxy PFPE (PFPE-DMA) reported recently, offers a combination of high modulus (10.5 MPa), low surface energy (18.5 mNm(-1)), chemical inertness, and resistance to solvent induced swelling that make it useful for producing high fidelity patterns with these soft lithographic methods. The results are comparable to, and in some cases even better than, those obtained with the more widely explored material, high modulus poly(dimethylsiloxane) (h-PDMS).     

On subelliptic manifolds

A smooth complex quasi-affine algebraic variety Y is flexible if its special group SAut(Y) of automorphisms (generated by the elements of one-dimensional unipotent subgroups of Aut(Y)) acts transitively on Y, and an algebraic variety is stably flexible if its product with some affine space is flexible. An irreducible algebraic variety X is locally stably flexible if it is a union of a finite number of Zariski open sets each of which is stably flexible. The main result of this paper states that the blowup of a locally stably flexible variety along a smooth algebraic subvariety (not necessarily equidimensional or connected) is subelliptic, and, therefore, it is an Oka manifold.     

A shrinking projection method for solving the split common null point problem in Banach spaces

Numerical Algorithms - In this paper, in order to solve the split common null point problem, we investigate a new explicit iteration method, base on the shrinking projection method and...