Left- or Right-Handed Lamellar Twists in Poly[(R)-3-hydroxyvalerate] Banded Spherulite: Dependence on Growth Axis

2009 ◽  
Vol 42 (3) ◽  
pp. 694-701 ◽  
Author(s):  
Hai-Mu Ye ◽  
Jun Xu ◽  
Bao-Hua Guo ◽  
Tadahisa Iwata
Keyword(s):  
Growth Axis ◽  
Banded Spherulite

First principles calculation of structural, electronic and optical properties of (001) and (110) growth axis (InN)/(GaN)n superlattices

2021 ◽  
Vol 67 (1 Jan-Feb) ◽  
pp. 7
Author(s):  
B. Bachir Bouiadjra ◽  
N. Mehnane ◽  
N. Oukli
Keyword(s):  
Optical Properties ◽  
Density Functional ◽  
Electronic Band Structure ◽  
Scale Up ◽  
Energy Scale ◽  
First Principles Calculation ◽  
Full Potential ◽  
Electronic Band ◽  
Electronic And Optical Properties ◽  
Growth Axis

Based on the full potential linear muffin-tin orbitals (FPLMTO) calculation within density functional theory, we systematically investigate the electronic and optical properties of (100) and (110)-oriented (InN)/(GaN)n zinc-blende superlattice with one InN monolayer and with different numbers of GaN monolayers. Specifically, the electronic band structure calculations and their related features, like the absorption coefficient and refractive index of these systems are computed over a wide photon energy scale up to 20 eV. The effect of periodicity layer numbers n on the band gaps and the optical activity of (InN)/(GaN)n SLs in the both  growth axis (001) and (110) are examined and compared. Because of prospective optical aspects of (InN)/(GaN)n such as light-emitting applications, this theoretical study can help the experimental measurements.

Nitrogen isotope sclerochronology - insights into coastal environmental conditions and Pinna nobilis ecology

2021 ◽  
Author(s):  
Melita Peharda ◽  
David Gillikin ◽  
Bernd Schöne ◽  
Anouk Verheyden-Gillikin ◽  
Hana Uvanović ◽  
...  
Keyword(s):  
High Resolution ◽  
Shell Growth ◽  
Time Interval ◽  
Shell Surface ◽  
Growth Axis ◽  
Pinna Nobilis ◽  
External Shell ◽  
Isotopic Baseline ◽  
The Mediterranean ◽  
Shell Powder

<p><em>Pinna nobilis</em> is a large bivalve endemic to the Mediterranean Sea that lives in shallow coastal areas. Due to its size and relatively fast shell growth rates, it is an interesting taxon for high resolution geochemical and sclerochronological research. Subsequently to previous analyses of δ<sup>18</sup>O and δ<sup>13</sup>C in <em>P. nobilis</em> shells, here, we investigate nitrogen isotopes in the carbonate-bound organic matrix (δ<sup>15</sup>N<sub>CBOM</sub>) of this species. Our objectives were to test if <em>P. nobilis</em> shells (i) can be used as an indicator of the isotopic baseline of the system, and (ii) is a good candidate for obtaining high-resolution temporal data on environmental δ<sup>15</sup>N variability. Due to the multiple mass mortality events of <em>P. nobilis</em> spreading throughout the Mediterranean, including the Adriatic Sea, we also tested if (iii) <em>P. nobilis</em> geochemistry changes as a response to diseases.</p><p>Shells were opportunistically collected by skin diving from 4 shallow coastal localities in the eastern Adriatic, as a part of a project on mortality monitoring. Specimens from Lim channel (October 2019), Kaštela Bay (January 2020) and Mali Ston Bay (November 2019) were collected alive, while in Pag Bay, shells of three recently dead specimens were collected in September 2020. Tissue and epibionts were removed and shells carefully cleaned and air-dried. Shell powder was collected by milling sample swaths by hand using a DREMEL Fortiflex drill equipped with a 300 μm tungsten carbide drill bit. For δ<sup>15</sup>N<sub>CBOM</sub> analysis, three shells from each locality were processed and three replicas were collected from each of these shells by milling shallow lines parallel to the growth axis from the internal shell surface. In addition, high-resolution δ<sup>15</sup>N<sub>CBOM</sub> data were obtained for one shell from Kaštela by milling lines (N=40) perpendicular to the major growth axis from the external shell surface. From this shell we also collected shell powder for δ<sup>18</sup>O<sub>shell</sub> and δ<sup>13</sup>C<sub>shell</sub> analysis to enable placing δ<sup>15</sup>N<sub>CBOM</sub> into temporal context. Isotope samples were analyzed Union College on an elemental analyzer - isotope ratio mass spectrometer.</p><p>Results indicate significant differences in δ<sup>15</sup>N<sub>CBOM</sub> between sampling localities, with lowest values recorded for shells from Pag Bay (3.73±0.36‰), and highest for shells sampled in Lim channel (7.04±0.63‰). High-resolution δ<sup>15</sup>N<sub>CBOM</sub> data obtained from the shell collected from Kaštela Bay corresponded to a time interval from spring 2018 to spring 2019. These data showed relatively small variations (5.02±0.33‰). However, δ<sup>15</sup>N<sub>CBOM</sub> values increased to 8.65±1.61‰ closest to the shell margin, and were coupled with a decrease in δ<sup>13</sup>C<sub>shell</sub> values, indicating that this animal was experiencing stressful conditions several months prior to its death. According to our findings, δ<sup>15</sup>N<sub>CBOM</sub> values serve as an indicator of the isotopic baseline of the ecosystem as well as a potential powerful tool to study bivalve physiology.</p><p>Research was the supported by the Croatian Science Foundation, research project BivACME.</p>

A novel crystal morphology of isotactic polypropylene induced by pressure vibration field: α Banded spherulite

2015 ◽  
Vol 153 ◽  
pp. 66-69 ◽  
Author(s):  
Chao Xia ◽  
Hailan Du ◽  
Feifei Wang ◽  
Renxi La ◽  
Dashan Mi ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Crystal Morphology ◽  
Banded Spherulite ◽  
Vibration Field

Erratum: Donor transition energy in GaAs superlattices in a magnetic field along the growth axis

1993 ◽  
Vol 48 (7) ◽  
pp. 4978-4978 ◽  
Author(s):  
J. M. Shi ◽  
F. M. Peeters ◽  
G. Q. Hai ◽  
J. T. Devreese
Keyword(s):  
Magnetic Field ◽  
Transition Energy ◽  
Growth Axis

Crystal Structure and Banded Spherulite of Poly(trimethylene terephthalate)

2000 ◽  
Vol 33 (20) ◽  
pp. 7529-7537 ◽  
Author(s):  
Rong-Ming Ho ◽  
Kae-Zen Ke ◽  
Ming Chen
Keyword(s):  
Crystal Structure ◽  
Banded Spherulite ◽  
Trimethylene Terephthalate

C60 Nanowhiskers Formed by the Liquid–liquid Interfacial Precipitation Method

2002 ◽  
Vol 17 (1) ◽  
pp. 83-88 ◽  
Author(s):  
K. Miyazawa ◽  
Y. Kuwasaki ◽  
A. Obayashi ◽  
M. Kuwabara
Keyword(s):  
Isopropyl Alcohol ◽  
Toluene Solution ◽  
Precipitation Method ◽  
Intermolecular Distance ◽  
Single Crystalline ◽  
Growth Axis

Fine needlelike crystals of C60 have been formed by a liquid–liquid interfacial precipitation method which uses an interface of the concentrated toluene solution of C60/isopropyl alcohol. The needlelike crystals of C60 with a diameter of submicrons (“C60 nanowhiskers”) were found to be single crystalline and composed of thin slabswith a thickness of about 10 nm. The intermolecular distance of the C60 nanowhiskerswas found to be shortened along the growth axis as compared with the pristine C60crystals, indicating a formation of strong bonding between C60 molecules. TheC60 nanowhiskers are assumed to be polymerized via the “2 + 2” cycloaddition inthe close-packed [110]c direction.

Determination of lamellar twisting manner in a banded spherulite with scanning microbeam X-ray scattering

Polymer ◽  
2010 ◽  
Vol 51 (7) ◽  
pp. 1632-1638 ◽  
Author(s):  
Tatsuya Kikuzuki ◽  
Yuya Shinohara ◽  
Yoshinobu Nozue ◽  
Kazuki Ito ◽  
Yoshiyuki Amemiya
Keyword(s):  
X Ray ◽  
X Ray Scattering ◽  
Banded Spherulite ◽  
Ray Scattering

scholarly journals Arabidopsis KAM2/GRV2 Is Required for Proper Endosome Formation and Functions in Vacuolar Sorting and Determination of the Embryo Growth Axis

2007 ◽  
Vol 19 (1) ◽  
pp. 320-332 ◽  
Author(s):  
Kentaro Tamura ◽  
Hideyuki Takahashi ◽  
Tadashi Kunieda ◽  
Kentaro Fuji ◽  
Tomoo Shimada ◽  
...  
Keyword(s):  
Growth Axis ◽  
Vacuolar Sorting
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