آنتونی رابینز میگه : من در 40 سالگی به جایی رسیدم که برای رسیدن بهش 82 سال زمان لازمه و این رو مدیون کتاب خواندن زیاد هستم.
زبان فایل : انگلیسی
نوع فایل : PDF
Egyptians sutured wounds as early as 3500 B.C. using a variety of natural
polymers including treated intestines which are the early versions of collagen-based surgical gut sutures.1 Synthetic absorbable polyesters based on 2-hydroxyacetic acids were developed for preparing less tissue reactive alternatives to surgical gut sutures in the early 1970s. In addition to collagenbased polymers other natural absorbable polymers such as albumin chitosan and hyaluronic acid and derivatives thereof have been used for many
pharmaceutical and biomedical applications for several decades.2 Of these
polymers the application of chitosan and hyaluronic acid–based polymers
has received a great deal of attention in the past 15 years for use in controlled
drug delivery systems tissue repair tissue engineering and controlling certain biological events.
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