Study of the Interface of the Early Stages of Growth under Quasi-Equilibrium Conditions of ZnO on Graphene/Cu and Graphite

2018 ◽  
Vol 6 (3) ◽  
pp. 1801689 ◽  
Author(s):  
Carlos Morales ◽  
Andrés Black ◽  
Fernando J. Urbanos ◽  
Daniel Granados ◽  
Javier Méndez ◽  
...  
Keyword(s):  
Quasi Equilibrium ◽  
Equilibrium Conditions ◽  
Stages Of Growth ◽  
Early Stages

scholarly journals A Comparative Study of the ZnO Growth on Graphene and Graphene Oxide: The Role of the Initial Oxidation State of Carbon

2020 ◽  
Vol 6 (2) ◽  
pp. 41
Author(s):  
Miguel Angel Gomez-Alvarez ◽  
Carlos Morales ◽  
Javier Méndez ◽  
Adolfo del Campo ◽  
Fernando J. Urbanos ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Oxidation State ◽  
Atomic Ratio ◽  
Quasi Equilibrium ◽  
Initial Oxidation ◽  
Sio2 Substrate ◽  
Graphene Layers ◽  
Stages Of Growth ◽  
Early Stages

The role of the oxidation state of carbon on the early stages of growth of metal oxides was studied for the particular case of ZnO deposition on graphene and graphene oxide on SiO2 (G/SiO2 and GO/SiO2, respectively) substrates. The growth was carried out by thermal evaporation of metallic Zn under an oxygen atmosphere at room temperature. This technique permits quasi-equilibrium conditions during the oxide growth, allowing the characterization of the fundamental interaction between ZnO and the graphene-based substrates. Although in both cases ZnO follows a Volmer–Weber growth mode controlled by nucleation at defects, the details are different. In the case of the GO/SiO2 substrate, the nucleation process acts as a bottleneck, limiting the coverage of the complete surface and allowing the growth of very large ZnO structures in comparison to G/SiO2. Moreover, by studying the Zn-LMM Auger spectra, it is shown how the initial nature of the substrate influences the composition of the ZnO deposit during the very early stages of growth in terms of Zn/O atomic ratio. These results are compared to those previously reported regarding ZnO growth on graphite and graphene on Cu (G/Cu). This comparison allows us to understand the role of different characteristics of graphene-based substrates in terms of number of defects, oxidation state, graphene support substrate and number of graphene layers.

Spherulitic crystal growth in the prodissoconch larval of Crassostrea virginica

1983 ◽  
Vol 41 ◽  
pp. 518-519
Author(s):  
George G. Cocks ◽  
Louis Leibovitz ◽  
DoSuk D. Lee
Keyword(s):  
Crystal Structure ◽  
Crassostrea Virginica ◽  
Crystal Orientation ◽  
Developmental Changes ◽  
Gastrula Stage ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Stages Of Growth ◽  
Early Stages ◽  
Initial Deposition

Our understanding of the structure and the formation of inorganic minerals in the bivalve shells has been considerably advanced by the use of electron microscope. However, very little is known about the ultrastructure of valves in the larval stage of the oysters. The present study examines the developmental changes which occur between the time of conception to the early stages of Dissoconch in the Crassostrea virginica(Gmelin), focusing on the initial deposition of inorganic crystals by the oysters.The spawning was induced by elevating the temperature of the seawater where the adult oysters were conditioned. The eggs and sperm were collected separately, then immediately mixed for the fertilizations to occur. Fertilized animals were kept in the incubator where various stages of development were stopped and observed. The detailed analysis of the early stages of growth showed that CaCO3 crystals(aragonite), with orthorhombic crystal structure, are deposited as early as gastrula stage(Figuresla-b). The next stage in development, the prodissoconch, revealed that the crystal orientation is in the form of spherulites.

scholarly journals Effects of different types of shelter on physiology and growth of Sangiovese vines during the first year after planting

2019 ◽  
Vol 13 ◽  
pp. 04020
Author(s):  
Giovan Battista Mattii ◽  
Eleonora Cataldo ◽  
Linda Salvi ◽  
Sofia Sbraci ◽  
Francesca Paoli ◽  
...  
Keyword(s):  
Water Potential ◽  
First Year ◽  
Gas Exchanges ◽  
Circular Section ◽  
Stages Of Growth ◽  
Early Stages ◽  
Single Leaf ◽  
Leaf Gas Exchanges ◽  
Different Types ◽  
Sprout Growth

In the early stages of planting, the shelter can provide for young vines protection against damage of various kinds. Despite their widespread use, few surveys have been devoted to the study of innovative shelter types and the possible influence of these protections on the physiology and development of plants. In the present experiment, which took place in 2017 in a Tuscan winery, the effects of vine protections by the company OSO (Prato) on single leaf gas exchanges and on the shoot growth in the first year of planting were studied. Three types of shelters with a circular section (completely perforated, partially perforated and closed) have been compared with the traditional full-wall shelters with square section. During the growing season, sprout growth measures, leaf area, leaf gas exchanges and water potential were carried out on the young vines. At the end of the season, shoots were sampled to measure the dry matter accumulated during the season. Among the shelters taken into consideration, it emerges that the completely perforated type guarantees the best development, with differences that are almost always significant for most of the measured parameters with traditional shelters. On the contrary, the closed typology has led to a reduction in growth, in gas exchanges and in water potential. In conclusion, the type completely perforated could constitute a valid alternative to the traditional one because, besides being a useful means for the protection of the vine, it could benefit the development of the root system in the early stages of growth.

Seed priming with cysteine modulates the growth and metabolic activity of wheat plants under salinity and osmotic stresses at early stages of growth

2016 ◽  
Vol 21 (3) ◽  
pp. 279-286 ◽  
Author(s):  
Fatemeh Nasibi ◽  
Khosrow Manouchehri Kalantari ◽  
Roya Zanganeh ◽  
Ghasem Mohammadinejad ◽  
Hakimeh Oloumi
Keyword(s):  
Metabolic Activity ◽  
Seed Priming ◽  
Stages Of Growth ◽  
Early Stages

2D versus 3D competition at the early stages of growth for Ge on Si(001) by molecular dynamics

2002 ◽  
Vol 89 (1-3) ◽  
pp. 157-159 ◽  
Author(s):  
P Raiteri ◽  
M Celino ◽  
F Valentinotti ◽  
L Miglio
Keyword(s):  
Molecular Dynamics ◽  
Stages Of Growth ◽  
Early Stages

Morphological variations of Phrosina semilunata Risso, 1822 juveniles (Crustacea: Amphipoda: Hyperiidea), new evidence from the Gulf of Mexico

Zootaxa ◽  
2021 ◽  
Vol 4995 (3) ◽  
pp. 594-600
Author(s):  
MARCO VIOLANTE-HUERTA ◽  
LAURA SANVICENTE-AÑORVE ◽  
MARGARITA HERMOSO-SALAZAR ◽  
AURORA MARRÓN-BECERRA
Keyword(s):  
Gulf Of Mexico ◽  
Monotypic Genus ◽  
Stages Of Development ◽  
Morphological Variations ◽  
Stages Of Growth ◽  
Early Stages ◽  
Southern Gulf Of Mexico ◽  
New Evidence ◽  
Lack Of Knowledge

Lack of knowledge of morphological variations during growth of amphipod crustaceans can result in misidentification of species. In this study, we advance the knowledge of morphological variations of juveniles of the monotypic genus Phrosina Risso, 1822 collected in the oceanic province of the southern Gulf of Mexico. The juveniles differed from the adults mainly in the morphology of pereopods 3 & 4 in that the carpal process is parallel to the propodus, also the rami of the pleopoda consist of only four segments, uropoda 3 are more lanceolate, and the uropoda bear a large prominent spine terminally. These morphological variations have not been described for the species previously. Therefore, the current observations enrich the description of P. semilunata in the early stages of growth and support the need for further taxonomical studiest that could help identify species at different stages of development.  

Direct Measurements of Energy Relaxation Times in Two-Dimensional Structures under Quasi-Equilibrium Conditions

2002 ◽  
Vol 384-385 ◽  
pp. 107-116 ◽  
Author(s):  
A. Verevkin ◽  
E.M. Gershenzon ◽  
G.N. Gol'tsman ◽  
N.G. Ptitsina ◽  
G.M. Chulkova ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Energy Relaxation ◽  
Quasi Equilibrium ◽  
Two Dimensional ◽  
Equilibrium Conditions ◽  
Direct Measurements

The early stages of growth of Mn deposited at room temperature on Ag(001) studied by MnK-edge SEXAFS and MnL2,L3-edges XAS

1999 ◽  
Vol 6 (3) ◽  
pp. 784-786 ◽  
Author(s):  
P. Schieffer ◽  
M.-H. Tuilier ◽  
C. Krembel ◽  
M.-C. Hanf ◽  
G. Gewinner ◽  
...  
Keyword(s):  
Room Temperature ◽  
Stages Of Growth ◽  
Early Stages
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