scholarly journals Front Cover: Magnesium Oxide‐Catalyzed Conversion of Chitin to Lactic Acid (ChemistryOpen 3/2021)

ChemistryOpen ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 305-305
Author(s):  
Kodchakon Kun‐asa ◽  
Prasert Reubroycharoen ◽  
Kiyoyuki Yamazaki ◽  
Naoki Mimura ◽  
Osamu Sato ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Magnesium Oxide ◽  
Front Cover

scholarly journals Magnesium Oxide‐Catalyzed Conversion of Chitin to Lactic Acid

ChemistryOpen ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 307-307
Author(s):  
Kodchakon Kun‐asa ◽  
Prasert Reubroycharoen ◽  
Kiyoyuki Yamazaki ◽  
Naoki Mimura ◽  
Osamu Sato ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Magnesium Oxide

The crystallization behaviors and mechanical properties of poly(l-lactic acid)/magnesium oxide nanoparticle composites

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 43855-43863 ◽  
Author(s):  
Junping Jia ◽  
Jinjun Yang ◽  
Yun Zhao ◽  
Hui Liang ◽  
Minfang Chen
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Magnesium Oxide ◽  
Solution Casting ◽  
Casting Method ◽  
Oxide Composite ◽  
Solution Casting Method ◽  
Oxide Nanoparticle ◽  
Surface Modified ◽  
Nanoparticle Composites

Nanocomposites of biodegradable PLLA and magnesium oxide composite (PLLA/MgO-NPs) and surface modified magnesium oxide composite (PLLA/m-MgO-NPs) were prepared using a solution casting method.

Lactic acid–magnesium oxide nanocrystal interactions: how nanoparticle size and shape affect chemistry and template oligomerization

2009 ◽  
Vol 33 (9) ◽  
pp. 1951 ◽  
Author(s):  
Erin M. Beavers ◽  
Kenneth J. Klabunde ◽  
Biobing Wang ◽  
Susan Sun
Keyword(s):  
Lactic Acid ◽  
Magnesium Oxide ◽  
Nanoparticle Size ◽  
Size And Shape

scholarly journals Selective Depolymerization and Effects of Homolysis of Poly(L-lactic acid) in a Blend with Polypropylene

2009 ◽  
Vol 2009 ◽  
pp. 1-9 ◽  
Author(s):  
Haruo Nishida ◽  
Yoshiro Arazoe ◽  
Takayuki Tsukegi ◽  
Wang Yan ◽  
Yoshihito Shirai
Keyword(s):  
Activation Energy ◽  
Lactic Acid ◽  
Magnesium Oxide ◽  
Volatile Product ◽  
Selective Degradation ◽  
Activation Energy Of Degradation

Blends of poly(L-lactic acid) (PLLA) and polypropylene (PP), which are candidates for the practical use of PLLA, were investigated for selective degradation of PLLA, resulting in quantitative conversion of PLLA components into cyclic monomers, lactides, using magnesium oxide (MgO) as a depolymerization catalyst. Obviously, the catalyst MgO selectively accelerated only the PLLA depolymerization in the blends, dominantly generating L,L-lactide as a volatile product and separating the PP component. Expected effects of homolysis in the blend system were also determined as slight changes in activation energy of degradation for both the components and through the suppression of degradation by an antioxidant.

scholarly journals Magnesium Oxide‐Catalyzed Conversion of Chitin to Lactic Acid

ChemistryOpen ◽  
2021 ◽  
Author(s):  
Kodchakon Kun‐asa ◽  
Prasert Reubroycharoen ◽  
Kiyoyuki Yamazaki ◽  
Naoki Mimura ◽  
Osamu Sato ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Magnesium Oxide

Demonstration of Retinal Glycogen with Silver Methenamine

1971 ◽  
Vol 29 ◽  
pp. 564-565
Author(s):  
A. W. Sedar ◽  
G. H. Bresnick
Keyword(s):  
Lactic Acid ◽  
Chromic Acid ◽  
Periodic Acid ◽  
Müller Cell ◽  
External Limiting Membrane ◽  
Electron Microscope Level ◽  
Reactive Process ◽  
Inner Limiting Membrane ◽  
Muller Cell ◽  
And Migration

After experimetnal damage to the retina with a variety of procedures Müller cell hypertrophy and migration occurs. According to Kuwabara and others the reactive process in these injuries is evidenced by a marked increase in amount of glycogen in the Müller cells. These cells were considered originally supporting elements with fiber processes extending throughout the retina from inner limiting membrane to external limiting membrane, but are known now to have high lactic acid dehydrogenase activity and the ability to synthesize glycogen. Since the periodic acid-chromic acid-silver methenamine technique was shown to demonstrate glycogen at the electron microscope level, it was selected to react with glycogen in the fine processes of the Müller cell that ramify among the neural elements in various layers of the retina and demarcate these cells cytologically. The Rhesus monkey was chosen as an example of a well vascularized retina and the rabbit as an example of a avascular retina to explore the possibilities of the technique.

Observations of the Thermal Decomposition of Brucite

1968 ◽  
Vol 26 ◽  
pp. 446-447
Author(s):  
P. L. Burnett ◽  
W. R. Mitchell ◽  
C. L. Houck
Keyword(s):  
Thermal Decomposition ◽  
Magnesium Oxide ◽  
Basal Plane ◽  
Magnesium Ions ◽  
A Value ◽  
Reaction Proceeds

Natural Brucite (Mg(OH)2) decomposes on heating to form magnesium oxide (MgO) having its cubic ﹛110﹜ and ﹛111﹜ planes respectively parallel to the prism and basal planes of the hexagonal brucite lattice. Although the crystal-lographic relation between the parent brucite crystal and the resulting mag-nesium oxide crystallites is well known, the exact mechanism by which the reaction proceeds is still a matter of controversy. Goodman described the decomposition as an initial shrinkage in the brucite basal plane allowing magnesium ions to shift their original sites to the required magnesium oxide positions followed by a collapse of the planes along the original <0001> direction of the brucite crystal. He noted that the (110) diffraction spots of brucite immediately shifted to the positions required for the (220) reflections of magnesium oxide. Gordon observed separate diffraction spots for the (110) brucite and (220) magnesium oxide planes. The positions of the (110) and (100) brucite never changed but only diminished in intensity while the (220) planes of magnesium shifted from a value larger than the listed ASTM d spacing to the predicted value as the decomposition progressed.

Time-resolved high-resolution electron microscopy of structural stability in mgo clusters

1996 ◽  
Vol 54 ◽  
pp. 672-673
Author(s):  
T. Kizuka ◽  
N. Tanaka
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Magnesium Oxide ◽  
Structural Stability ◽  
High Resolution Electron Microscopy ◽  
Video Tape ◽  
Solid State Physics ◽  
Time Resolved ◽  
Resolution Electron ◽  
Structural And Functional Properties

Structure and stability of atomic clusters have been studied by time-resolved high-resolution electron microscopy (TRHREM). Typical examples are observations of structural fluctuation in gold (Au) clusters supported on silicon oxide films, graphtized carbon films and magnesium oxide (MgO) films. All the observations have been performed on the clusters consisted of single metal element. Structural stability of ceramics clusters, such as metal-oxide, metal-nitride and metal-carbide clusters, has not been observed by TRHREM although the clusters show anomalous structural and functional properties concerning to solid state physics and materials science.In the present study, the behavior of ceramic, magnesium oxide (MgO) clusters is for the first time observed by TRHREM at 1/60 s time resolution and at atomic resolution down to 0.2 nm.MgO and gold were subsequently deposited on sodium chloride (001) substrates. The specimens, single crystalline MgO films on which Au particles were dispersed were separated in distilled water and observed by using a 200-kV high-resolution electron microscope (JEOL, JEM2010) equipped with a high sensitive TV camera and a video tape recorder system.

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