			Home About us Contact

Volume Content (volume + content)

Distribution by Scientific Domains

Polymers and Materials Science	75%

Selected Abstracts

In vitro evaluation of porous poly(L -lactic acid) scaffold reinforced by chitin fibers

JOURNAL OF BIOMEDICAL MATERIALS RESEARCH, Issue 2 2009
Xiaoming Li
Abstract In this study, the previously reported porous three-dimensional poly(L -lactic acid) (PLLA) scaffolds reinforced by the chitin fibers (PLLA/CF) with and without the link were evaluated in vitro. Firstly, pH value of the phosphate buffered saline lixiviums of the PLLA/CF with different content of the chitin fibers was measured to get an appropriate content of the chitin fibers in the PLLA/CF. Then, the cell functions (attachment, proliferation, alkaline phosphatase per unit cell, total protein per unit cell, and osteonectin, osteopontin, and osteocalcin gene expression) of human osteoblast-like cells (SaOS2) cultured on the PLLA/CF with the link, PLLA/CF without the link and PLLA scaffold were compared. The results showed that the link treatment did not significantly influence the pH value of the lixiviums of the scaffolds, 30% volume content might be an appropriate content of the chitin fibers in PLLA/CF scaffold to keep the pH value of the lixiviums of the scaffolds between 7.0 and 7.2 during the lixiviation time of 16 weeks, the PLLA/CF scaffold was significantly better for the attachment, proliferation, differentiation, and mineralization of the osteoblast than PLLA, the link treatment did not significantly influence these cells activities, which further suggested that PLLA/CF with the link treatment might be an appropriate scaffold for tissue engineering. © 2009 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2009 [source]

Magnetorheological elastomers based on isobutylene,isoprene rubber

POLYMER ENGINEERING & SCIENCE, Issue 3 2006
Yinling Wang
Magnetorheological (MR) elastomers are a group of smart materials whose modulus can be controlled by the application of an external magnetic field. In this paper, MR elastomers based on isobutylene,isoprene rubber were prepared by the common manufacturing procedure of rubber and the corresponding MR effect, mechanical properties, and thermal stability were investigated. The results showed that MR effect varied with the volume content of iron particles and a maximum of 20% in MR effect was obtained at 15 vol% of iron particles. The relationship between MR effect and microstructure was discussed in detail. Mechanical tests showed that iron particles could improve the tensile strength and hardness. However, compared with carbon black with the same volume content, the reinforcing effect was far worse. TG analysis showed the thermal stability of isobutylene,isoprene rubber was improved by incorporation of iron particles. POLYM. ENG. SCI. 46:264,268, 2006. © 2006 Society of Plastics Engineers [source]

Introduction: The Archaeology of Childhood in Context

ARCHEOLOGICAL PAPERS OF THE AMERICAN ANTHROPOLOGICAL ASSOCIATION, Issue 1 2005
Jane Eva Baxter
This introductory chapter contextualizes the volume contents within broader themes and histories in the archaeological and anthropological study of childhood. Some of these broader issues include how archaeologists have situated childhood studies within the discipline, how archaeologists have identified children through the archaeological record, and how the archaeological study of childhood leads to interdisciplinary conversations across the subfields. [source]