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An ionic liquid, 1-ethyl-3-methylimidazolium acetate (EMIMAc), was synthesized and employed as a homogeneous and green reaction media to prepare chitosan-graft-polycaprolactone (CS-g-PCL) via ring-opening polymerization, using stannous octoate (Sn(Oct)2) as a catalyst. The structures and compositions of copolymers could be facilely controlled by the(More)
Traditionally, hydrophobic aliphatic polyester has been employed to modify chitosan and organic soluble or swellable graft copolymers have been obtained. In this work, linear poly(butylene tartrate) (PBT) with hydrophilic pendant hydroxyl groups, which was synthesized by direct polycondensation of tartaric acid and butanediol under mild condition, was(More)
Wireless sensor networks monitor specific areas through periodical data collecting mechanism, where sensor nodes sense information and forward data to Sink via multi-hop wireless communications. Since the timeliness of collecting data is of great importance to many applications, a low-latency data collection network structure (LDCNS) which minimizes delays(More)
BACKGROUND Nonalcoholic fatty liver disease (NAFLD) represents one of the most common forms of liver disease worldwide, and it is always regarded as a consequence of a sedentary, food-abundant lifestyle, sitting for an extended time, and a low physical activity level, which often coincide with chronic and long-lasting psychological stress. A Chinese(More)
A new p-tert-butylthiacalix[4]arene derivative, C(72)H(68)N(4)O(4)S(4) x 2CH(2)Cl(2), has been synthesized and is comprised of one tetra-p-tert-butyltetrakis(2-cyanobenzyloxy)tetrathiacalix[4]arene and two dichloromethane molecules. The calix[4]arene molecule is centrosymmetric and adopts an unusual 1,2-alternate conformation via pi-pi interactions between(More)