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yzhuang
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wmn1984(½ð±Ò+1): 2010-08-24 10:10:08
wmn1984(½ð±Ò+1):ÄܸæËßÎÒÔõôÕÒÕⲿ·ÖÎÄÏ×Âð£¿ÎÒÕÒÁ˺þö¼ÕÒ²»µ½¡£¡£¡£Ð»Ð»ÁË¡£ 2010-08-24 10:12:01
yusen_1982(½ð±Ò+1):»¶ÓÌÖÂÛ£¡ 2010-08-24 20:07:29
wmn1984(½ð±Ò+1): 2010-08-24 10:10:08
wmn1984(½ð±Ò+1):ÄܸæËßÎÒÔõôÕÒÕⲿ·ÖÎÄÏ×Âð£¿ÎÒÕÒÁ˺þö¼ÕÒ²»µ½¡£¡£¡£Ð»Ð»ÁË¡£ 2010-08-24 10:12:01
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2Â¥2010-08-24 10:03:14
yzhuang
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- Ìû×Ó: 199
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wmn1984(½ð±Ò+1): 2010-08-24 18:28:44
wmn1984(½ð±Ò+2):°ÑʣϵĽð±Ò¶¼¸øÄãÁË£¬Ì«¸ÐлÁË¡£¡£¡£¡£ 2010-08-24 18:36:56
yusen_1982(½ð±Ò+1):»¶ÓÌÖÂÛ£¡ 2010-08-24 20:07:37
americanyk(½ð±Ò+1):Thank you 2010-08-24 18:28:43
wmn1984(½ð±Ò+1): 2010-08-24 18:28:44
wmn1984(½ð±Ò+2):°ÑʣϵĽð±Ò¶¼¸øÄãÁË£¬Ì«¸ÐлÁË¡£¡£¡£¡£ 2010-08-24 18:36:56
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americanyk(½ð±Ò+1):Thank you 2010-08-24 18:28:43
|
PEGylation strategies for active targeting of PLA/PLGA nanoparticles. Journal of Biomedical Materials Research Part A PLGA was reacted with DCC and NHS in an organic solvent at 23 C to activate the carboxylic acids to the semi- stable amine-reactive activated NHS-ester of PLGA (PLGA-NHS). After a specific reaction time, the polymer mixture was filtered to remove insoluble dicyclohexyl urea byproduct. The solution was concentrated, transferred to two 45-mL Teflon centrifuge tubes (<4 mL per tube) and the polymer was precipitated with ethyl ether or -20 C methanol. The polymer was pelleted by centrifugation and the supernatant removed. The pellet was dissolved in DCM (<1 mL), precipitated, and centrifuged once more to remove excess DCC, NHS, and remaining dicyclohexyl urea byproduct. |
3Â¥2010-08-24 17:08:11
yuyang031985
½ð³æ (ÕýʽдÊÖ)
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4Â¥2010-08-26 00:08:32
wmn1984
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5Â¥2010-08-27 16:09:28
wuruqitu
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6Â¥2010-08-29 10:26:37
caocmy
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7Â¥2010-08-29 10:43:55
wmn1984
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- É¢½ð: 295
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yusen_1982:ºÃÔË 2010-08-29 13:33:38
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liubin
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9Â¥2010-08-30 00:48:44
yzhuang
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- Ìû×Ó: 199
- ÔÚÏß: 186.6Сʱ
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