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The PHB extracted, PHB Sigma and PHB–TS showed two endothermal peaks in between 140 and 200°C. The enthalpy of melting (ΔHf) was 28.09J/g for standard PHB and for extracted one is 56.42J/g. The glass transition temperature of the sample was 140°C and amorphous temperature was ...
The outcomes were compared to those of standard results in the PubChem database and sigma reference. The chromatogram (Fig. 2) of the biopolymer extract revealed four major peaks with retention times of 21.140 min, 22.635 min, 30.096 min, and 35.441 min respectively. They are tetradecanoic ...
The phbBAC operon encodes the enzymes of PHB synthesis and is activated by the transcriptional regulator PhbR and the sigma factor RpoS. Iron limitation ... LF Muriel-Millán,M Castellanos,JA Hernandez-Eligio,... - 《Applied Microbiology & Biotechnology》 被引量: 1发表: 2014年 The pyrophosph...
All solvents used during the process of dehydration and extraction were ice cold, and were pretreated with molecular sieve beads, 8–12 mesh (No. 208604, Sigma-Aldrich, St Louis, MO, USA) to eliminate all traces of water. All the procedures were performed on ice. Before the extracted ...
The structure of extracted PHB was analyzed using FTIR and GC-MS, and the produced spectrum was compared with the PHB standard (Sigma cat no: 29435-48-1). NICOLET 380 FTIR (Thermo Scientific, China) was applied to identify the functional groups in the produced polymer [33]. To determine ...
Sigma factorTranscriptionSynechocystis sp. PCC 6803, a unicellular cyanobacterial species, changes intracellular nitrogen and carbon metabolism through the transcription factor NtcA in response to nitrogen deficiency. In this study, the change in metabolites in carbon storages and the related metabolites ...
Organically modified montmorillonite with 25–30 weight % trimethyl stearyl ammonium (OMMT) (nano-clay) was purchased from Sigma-Aldrich (product code 682608) and used as a filler for nanocomposite preparation. 3.2. Preparation of Nanocomposites PHB/OMMT blends were prepared with different weight ...
Isopropanol (IPA) manufactured by Sigma-Aldrich (Burlington, MA, USA) was utilized during SLA postprocessing to remove the remaining residual of the blend resin that was left over after the printing process. The molecular weight (Mw) of IPA is 60.10 g/mol, while the density is 0.785 g/mL...