The asymmetric unit of the title compound, C15H23NO5, contains two independent mol-ecules. Phaeosphaeride A contains two primary sections, an alkyl chain consisting of five C atoms and a cyclic system consisting of fused five- and six-membered rings with attached substituents. In the crystal, the mol-ecules form layered structures. Nearly planar sheets, parallel to the (001) plane, form bilayer...

We introduce a method for analyzing the complexity of natural language processing tasks, and for predicting the difficulty new NLP tasks. Our complexity measures are derived from the Kolmogorov complexity of a class of automata — meaning automata, whose purpose is to extract relevant pieces of information from sentences. Natural language semantics is defined only relative to the set of question...

Organic scaffolds of poly(ethyl methacrylate-co-hydroxyethyl acrylate) [P(EMA-co-HEA)] 70/30 wt % ratio, with varying proportions of silica SiO(2) from 0 to 20 wt % and aligned tubular pores, were prepared using a fiber-templating fabrication method, with the aim of mimicking structure and properties of the mineralized tissue of natural dentin. Precursors of the copolymer and silica were simult...

Background & Aims: Immunodeficiency virus (HIV) may lead to acquired immunodeficiency syndrome (AIDS) in human. Parasites are one of the most important causes of infectious diseases in patients with AIDS. The prevalence of these parasites varies based on the condition of host’s immune system and the stage of disease (HIV/AIDS). To compare the prevalence of opportunistic intestinal parasites a c...

Retinoids are synthetic and natural analogues of vitamin A that have various effects on cellular differentiation, cellular proliferation, immune system, and embryonic development. The present study reviews the history of systemic retinoids in medicine, the structure of syn

Hydrological processes and their spatial distribution directly are relevant to climate, topography, geology, and land use in the watershed. Therefore, use of a model whit integrity and high performance for simulating the process in deferent watersheds is very important. In this study was assessment performance of semi-distributed SWAT model in simulating hydrology processes in three watersheds ...