Poly(D,L-lactide)

多聚-β-羟丁酸poly-β-hydroxybutyricacid

　　 几种芽孢杆菌属（Bacillus），假单胞菌属（Pseudomonas）、螺菌属（Spirillum）、固氮菌属（Azotobacter）以及其他许多种细菌在菌体内制造的贮藏物质。   　　在光学显微镜下可以因折光或呈颗粒状而被观察到，并可用苏丹黑染色。在细菌中作为代替油脂贮藏物，而合成此化合物。一般在培养基中氮源缺乏而碳源多的条件下合成，如果供给氮化合物，水解成单体的β-羟丁酸后，经过乙酰乙酸、乙酰CoA，被利用来合成生物体内各种成分

Estimation of Chronological Age from the Racemization Rate of l- and d-Aspartic Acid: How to Completely Separate Enantiomers from Dentin

of technique. In general, living organs are composed of l -form amino acids. Conversion from l -form to d -form amino acids is a first-order chemical reaction. Thus, the quantity of d -form amino acids in an organ is proportional to the passed time (age

Processing of Resorbable Poly--Hydroxy Acids for Use as Tissue-Engineering Scaffolds

Poly (α-hydroxyacids) were found to be bioabsorble and biocompatible in the 1960s (1 ,2 ). They are the most widely known, studied and used bioabsorbable synthetic polymers in medicine. Polyglycolide (PGA) and poly-l -lactide (PLLA