Separation and thermal characterization of ionically and tightly cell-wall-bound pectin methylesterase from cucumbers ( Cucumis sativus )

1999 ◽  
Vol 208 (5-6) ◽  
pp. 369-372 ◽  
Author(s):  
Ahmet Yemenicioğlu ◽  
B. Cemeroğlu
Keyword(s):  
Cell Wall ◽  
Cucumis Sativus ◽  
Pectin Methylesterase ◽  
Thermal Characterization

Developmental variation of cell wall degrading enzymes from cucumber (Cucumis sativus) fruit tissues

1989 ◽  
Vol 67 (3) ◽  
pp. 817-821 ◽  
Author(s):  
A. Raymond Miller ◽  
Joseph P. Dalmasso ◽  
Dale W. Kretchman
Keyword(s):  
Cell Wall ◽  
Cucumis Sativus ◽  
Pectin Methylesterase ◽  
Lag Phase ◽  
Cell Wall Degrading Enzymes ◽  
Cucumis Sativus L ◽  
Developmental Variation ◽  
Phase 0 ◽  
Sigmoidal Growth ◽  
Increased Activity

Variation of cell wall degrading enzyme activities and tissue firmness from the petal senescence to overripe stages of fruit development was studied in greenhouse-grown cucumbers (Cucumis sativus L. cv. Heinz 3534). Cucumbers exhibited a typical sigmoidal growth curve with a short lag phase (0–8 days after pollination) and extended log phase (8–28 days) followed by a stationary phase. Mesocarp firmness decreased between 10 and 20 days after pollination, then increased until 32 days after pollination. This decrease of mesocarp firmness was accompanied by increased activity of cellulase (3.5-fold), polygalacturonase (20-fold), pectin methylesterase (4-fold), and xylanase (9-fold). By contrast, carpel tissue firmness declined from 8–20 days after pollination, and remained low until 32 days after pollination. Only polygalacturonase and xylanase activities exhibited significant increases (5- and 6-fold, respectively) during softening of this tissue. Further, these peaks of enzyme activity in the carpel occurred 10 days before the corresponding peaks in the mesocarp. These data suggest that mesocarp and carpel tissues of cucumber soften by similar, but not identical mechanisms.

Random pseudo promptings applied to the thermal characterization of a wet porous material

1999 ◽  
Vol 6 (1) ◽  
pp. 101-108 ◽  
Author(s):  
E. Delacre ◽  
D. Defer ◽  
E. Antczak ◽  
B. Duthoit
Keyword(s):  
Porous Material ◽  
Thermal Characterization

Photoacoustic thermal characterization of the dehydration process of Agar-SiO2emulsions

2005 ◽  
Vol 125 ◽  
pp. 177-180
Author(s):  
T. Lopez ◽  
M. Picquart ◽  
G. Aguirre ◽  
Y. Freile ◽  
D. H. Aguilar ◽  
...  
Keyword(s):  
Thermal Characterization ◽  
Dehydration Process

Thermal characterization of ABS-Graphene blended three dimensional printed functional prototypes for electro chemical energy storage

2018 ◽  
Vol 1 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Kamaljit Singh Boparai ◽  
Rupinder Singh
Keyword(s):  
Energy Storage ◽  
Structural Changes ◽  
Fused Deposition Modeling ◽  
Morphological Changes ◽  
Three Dimensional ◽  
Thermal Characterization ◽  
Chemical Energy ◽  
Flow Index ◽  
Fused Deposition

This study highlights the thermal characterization of ABS-Graphene blended three dimensional (3D) printed functional prototypes by fused deposition modeling (FDM) process. These functional prototypes have some applications as electro-chemical energy storage devices (EESD). Initially, the suitability of ABS-Graphene composite material for FDM applications has been examined by melt flow index (MFI) test. After establishing MFI, the feedstock filament for FDM has been prepared by an extrusion process. The fabricated filament has been used for printing 3D functional prototypes for printing of in-house EESD. The differential scanning calorimeter (DSC) analysis was conducted to understand the effect on glass transition temperature with the inclusion of Graphene (Gr) particles. It has been observed that the reinforced Gr particles act as a thermal reservoir (sink) and enhances its thermal/electrical conductivity. Also, FT-IR spectra realized the structural changes with the inclusion of Gr in ABS matrix. The results are supported by scanning electron microscopy (SEM) based micrographs for understanding the morphological changes.

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