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Microbial synthesis of poly(beta-hyd...

Kim, Ohyoung.

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Microbial synthesis of poly(beta-hydroxy alkanoates) containing novel functional side chain units for advanced material applications.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Microbial synthesis of poly(beta-hydroxy alkanoates) containing novel functional side chain units for advanced material applications./
作者:	Kim, Ohyoung.
面頁冊數:	164 p.
附註:	Source: Dissertation Abstracts International, Volume: 57-02, Section: B, page: 1119.
Contained By:	Dissertation Abstracts International57-02B.
標題:	Biology, Microbiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9618619

Microbial synthesis of poly(beta-hydroxy alkanoates) containing novel functional side chain units for advanced material applications.
Kim, Ohyoung.

Microbial synthesis of poly(beta-hydroxy alkanoates) containing novel functional side chain units for advanced material applications. - 164 p.

Source: Dissertation Abstracts International, Volume: 57-02, Section: B, page: 1119.

Thesis (Ph.D.)--University of Massachusetts Lowell, 1995.

In all cases, high molecular weight PHA's were formed and it was deduced that CP, NP and fluorine incorporation into PHA's formed by P. putida led to the formation of relatively lower molecular weight.Subjects--Topical Terms:

1017734
Biology, Microbiology.

Microbial synthesis of poly(beta-hydroxy alkanoates) containing novel functional side chain units for advanced material applications.
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245 1 0 $a Microbial synthesis of poly(beta-hydroxy alkanoates) containing novel functional side chain units for advanced material applications.
300 $a 164 p.
500 $a Source: Dissertation Abstracts International, Volume: 57-02, Section: B, page: 1119.
500 $a Supervisor: Richard A. Gross.
502 $a Thesis (Ph.D.)--University of Massachusetts Lowell, 1995.
520 $a In all cases, high molecular weight PHA's were formed and it was deduced that CP, NP and fluorine incorporation into PHA's formed by P. putida led to the formation of relatively lower molecular weight.
520 $a In MFLA carbon sources studied, higher polymer productivity was achieved when using P. oleovorans as opposed to P. putida. For both organisms, overally decreased PHA yields was observed for cultivations with NA/MFLA relative to 15 mM NA cultures.
520 $a The preparation of novel functional poly($\beta$-hydroxyalkanoates), PHA's with hyper-polarizable para-cyano- (CP), para-nitro-phenoxy alkyl ether (NP) or multi-fluorinated alkyl side chain substituents was carried out. For this purpose, Pseudomonas oleovorans ATCC 29347 and Pseudomonas putida KT 2442 microorganisms were selected as biocatalysts. To avoid any inhibitory effects of carbon sources on the cell growth, experiments were performed with non-polymer forming carbon sources in the first of a two-stage batch culture fermentation process. The carbon sources in the second stage cultivations were mixtures (total 15 mM) of sodium octanoate (OA) with either different chain length of para-cyano-phenoxyalkanoate (CPA), or para-nitro-phenoxy hexanoate (NPH). And mixtures of nonanoic acid (NA) with different chain length of multi-fluorinated alkanoates (MFLA) were also used.
520 $a For both organisms, only small deviations in the cell viability were observed when comparing second cultivations containing only 15 mM OA to those using mixtures of OA with either CPA or NPH as well as 15 mM NA to those using mixtures NA with MFLA. It was also found that these organisms showed no evidence of polymer accumulation at the onset of the second stage. It was suggested that these carbon sources by themselves supported neither cell growth nor polymer productions.
520 $a In CPA and NPH carbon sources, it was found that the composition and volumetric polymer yields were highly sensitive to the second stage cultivation time. The maximum PHA yields were obtained after 1d cultivation period and higher polymer productivity was achieved when using CPA as opposed to NPH. Use of NPH in place of CPH had deleterious effects on both P. putida polymer formation and NP incorporation. However, P. oleovorans formed PHA with only up to $\sim $2 % CP side chains using OA/CPH and little to no CP side groups using OA/CPV and CPB. Substitution of NPH in place of CPH lead to a modest increase (up to $\sim $5 %).
520 $a Investigation of the non-linear optical (NLO) properties of the PHA's containing CP or NP side groups illustrated that there was little change in the second harmonic generation (SHG) intensities up to 26 mole % CP incorporation. More increases to 35 mole %, SHG intensity was increased by a factor of 8 NP incorporated PHA's showed a higher SHG intensity than CP incorporated PHA's.
520 $a Surface properties of the PHA's containing multi-fluorinated alkyl side chains was examined by measuring the surface contact angle. In-vivo biodegradation studies suggested that PHA's containing CP side chain units were biodegraded more slowly than PHA's containing no CP side groups. Large increases in CP content were observed with increasing biodegradation time. (Abstract shortened by UMI.)
590 $a School code: 0111.
650 4 $a Biology, Microbiology. $3 1017734
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0410
690 $a 0495
710 2 0 $a University of Massachusetts Lowell. $3 1017839
773 0 $t Dissertation Abstracts International $g 57-02B.
790 $a 0111
790 1 0 $a Gross, Richard A., $e advisor
791 $a Ph.D.
792 $a 1995
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9618619