scholarly journals Skin Development in H. huso Larvae

2018 ◽  
Vol 35 (01) ◽  
pp. 37-43
Author(s):  
H. Fazel Shooraki ◽  
Z. Saadatfar ◽  
D. Shahsavani
Keyword(s):  
Microscopy Study ◽  
Collagen Fibrils ◽  
Huso Huso ◽  
Fish Skin ◽  
Skin Development ◽  
Self Organized ◽  
Dermal Thickness ◽  
Club Cells ◽  
Protection Mechanisms ◽  
Collagen Layer

Introduction Fish skin is important for life and protection mechanisms. Sturgeon skin also has an economical potential for its leather. Materials and Methods This article is a light microscopy study for knowledge the development of epidermis and dermis in one species of sturgeon (Huso. huso). The fishes from different days of week-1 to week-6 were caught from Shahid Marjani propagation center and were processed. Results From 1(dph) the epidermis as two layers and dermis as a very thin collagen layer had formed. Sensory buds in epidermis and chromatophore cells in dermis of head and also arranged the dermal endothelial cells were features of 3 (dph). At 10 (dph) there was an increase in epidermal cell line, existence the circular cells as club cells in epidermis and increase in dermal thickness observed. From the character of 20 (dph) was organized epidermis to three layers and collagen fibrils as parallel to body. From 25- 40 (dph) an increase in cell lines of epidermis up to 10 rows in some areas was observed. Conclusion The most important changes were the events occurred in dermis. The self-organized collagen fibrils to several lamellae, invading the fibroblasts to derm and forms of stratum campactum and stratum spongiosum.

Confocal microscopy study of decorin binding to collagen fibrils

2008 ◽  
Vol 27 ◽  
pp. 56
Author(s):  
Elena Makareeva ◽  
Mary B. Sutter ◽  
Angela M. DeRidder ◽  
Antonella Forlino ◽  
Antonio Rossi ◽  
...  
Keyword(s):  
Confocal Microscopy ◽  
Microscopy Study ◽  
Collagen Fibrils

Biochemical and structural characterization of sturgeon fish skin collagen ( Huso huso )

2020 ◽  
Vol 44 (8) ◽  
Author(s):  
Maryam Atef ◽  
Seyed Mahdi Ojagh ◽  
Ali Mohammad Latifi ◽  
Mina Esmaeili ◽  
Chibuike C. Udenigwe
Keyword(s):  
Structural Characterization ◽  
Huso Huso ◽  
Fish Skin ◽  
Skin Collagen ◽  
Sturgeon Fish ◽  
Fish Skin Collagen

Observation of unusual temperature-dependent stripes in LiTaO3and LiTaxNb1−xO3crystals with near-zero birefringence

2010 ◽  
Vol 43 (6) ◽  
pp. 1305-1313 ◽  
Author(s):  
A. M. Glazer ◽  
Nan Zhang ◽  
Ausrine Bartasyte ◽  
D. S. Keeble ◽  
S. Huband ◽  
...  
Keyword(s):  
Phase Transition ◽  
Room Temperature ◽  
Paraelectric Phase ◽  
Microscopy Study ◽  
Vapour Transport ◽  
Temperature Dependent ◽  
Paraelectric Phase Transition ◽  
Optical Birefringence ◽  
Self Organized ◽  
Li Content

A birefringence imaging microscopy study of LiTaO3and some mixed LiTaxNb1−xO3crystals is reported. The initially congruent LiTaO3crystals have been subject to vapour transport equilibration in order to increase the Li content and at the same time to reduce the optical birefringence close to zero at room temperature. In both types of crystal, the presence of unusual periodic self-organized stripes, existing over large distances, has been observed, which correlate with the well documented cleavage and twin planes in this material. Furthermore, the stripes become narrower as the temperature is changed away from the zero-birefringence temperature, but become temperature-independent above the ferroelectric–paraelectric phase-transition temperature.

Self-Assembled InAs Islands on (AI,Ga)As, an In Situ Scanning Tunneling Microscopy Study

1999 ◽  
Vol 571 ◽  
Author(s):  
P. Ballet ◽  
J.B. Smathers ◽  
G.J. Salamo
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Molecular Beam ◽  
Three Dimensional ◽  
Microscopy Study ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Self Organized ◽  
Scanning Tunneling Microscopy Study ◽  
Island Density

ABSTRACTWe report an in-situ molecular beam epitaxy – scanning tunneling microscopy study of three dimensional (3D) self organized InAs islands on (AI,Ga)As surfaces. The influence of the presence of Al atoms on the roughness of the starting surface and on the island density is shown by investigating several Al compositions. We emphasize the case of InAs/AlAs and point out the major differences between this system and the widely studied InAs/GaAs system.

scholarly journals Development of a Functional Skin Matrix Requires Deposition of Collagen V Heterotrimers

2004 ◽  
Vol 24 (13) ◽  
pp. 6049-6057 ◽  
Author(s):  
Hélène Chanut-Delalande ◽  
Christelle Bonod-Bidaud ◽  
Sylvain Cogne ◽  
Marilyne Malbouyres ◽  
Francesco Ramirez ◽  
...  
Keyword(s):  
Minor Component ◽  
Basement Membranes ◽  
Collagen Fibrils ◽  
Collagen Gene ◽  
Matrix Assembly ◽  
Stromal Fibroblasts ◽  
Ehlers Danlos Syndrome ◽  
Skin Development ◽  
Sequence Of Events ◽  
The Impact

ABSTRACT Collagen V is a minor component of the heterotypic I/III/V collagen fibrils and the defective product in most cases of classical Ehlers Danlos syndrome (EDS). The present study was undertaken to elucidate the impact of collagen V mutations on skin development, the most severely affected EDS tissues, using mice harboring a targeted deletion of the α2(V) collagen gene (Col5a2). Contrary to the original report, our studies indicate that the Col5a2 deletion (a.k.a. the pN allele) represents a functionally null mutation that affects matrix assembly through a complex sequence of events. First the mutation impairs assembly and/or secretion of the α1(V)2α2(V) heterotrimer with the result that the α1(V) homotrimer is the predominant species deposited into the matrix. Second, the α1(V) homotrimer is excluded from incorporation into the heterotypic collagen fibrils and this in turn severely impairs matrix organization. Third, the mutant matrix stimulates a compensatory loop by the α1(V) collagen gene that leads to additional deposition of α1(V) homotrimers. These data therefore underscore the importance of the collagen V heterotrimer in dermal fibrillogenesis. Furthermore, reduced thickness of the basement membranes underlying the epidermis and increased apoptosis of the stromal fibroblasts in pN/pN skin strongly indicate additional roles of collagen V in the development of a functional skin matrix.

Preterm Infant Skin Structure Is Qualitatively and Quantitatively Different From That of Term Newborns

2021 ◽  
pp. 109352662097683
Author(s):  
Robyn C Reed ◽  
Deanna E Johnson ◽  
Ann Marie Nie
Keyword(s):  
Stratum Corneum ◽  
Preterm Infants ◽  
Structural Changes ◽  
Hair Follicles ◽  
Control Groups ◽  
Term Neonates ◽  
Skin Development ◽  
Dermal Thickness ◽  
Term Newborns ◽  
And Control

Background The immature skin of preterm infants is uniquely vulnerable to pressure and chemical injury. We sought to qualitatively and quantitatively describe the histopathologic patterns of skin development in preterm infants. Methods Autopsy skin samples were examined for 48 liveborn preterm infants born at 18+ to 36 weeks, and control groups of term neonates and older infants/children. Quantitative variables included thickness of the stratum corneum, epidermis, and dermis. Qualitative features included stratum corneum, rete ridges, and hair follicles. Results Patterns of maturation were reproducible. Compact keratin appeared beginning at 21–22 weeks. Basketweave keratin appeared first around hair follicles, and then became more generalized from ∼28 weeks corrected gestational age (CGA) onward. Rete ridges began to appear at ∼30 weeks. Epidemal and dermal thickness increased with age. Infants who survived ≤7 days had thicker dermis than those who survived longer, even adjusted for CGA. Conclusions Skin development in preterm infants has reproducible milestones. Significant structural changes occurring around 28–30 weeks may improve barrier function, with implications for use of topical compounds such as chlorhexidine. The findings also highlight challenges in evaluating pressure injuries in preterm infants, and postnatal changes in skin parameters.

Self-organized Si Nanowires with Room-Temperature Photo-Emission

2002 ◽  
Vol 728 ◽  
Author(s):  
Chunhai Ji ◽  
Elena A. Guliants ◽  
Don Abeysinghe ◽  
Wayne A. Anderson
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Lattice Mismatch ◽  
Light Emitting Diode ◽  
Red Light ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Si Nanowires ◽  
Self Organized ◽  
Nickel Disilicide

AbstractTwo-dimensional arrays of self-organized Si nanowires were synthesized using the metal induced growth (MIG) method. In MIG processing, the thermally evaporated 25∼100 nm thick Ni films serve as prelayers for magnetron sputtered Si. When sputtering at 550°C, the Si crystallization occurs via the formation of nickel disilicide followed by subsequent epitaxial growth of Si crystals on nickel disilicide due to an extremely small lattice mismatch. Scanning electron microscopy study showed that the nanowires originated from the Si thin film and grew upwards in bundles. The diameter of the nanowires was 20∼50 nm. The length of the nanowires was typically 1 νm. Transmission electron microscopy and electron diffraction analysis revealed the single crystal structure of nanowires. Quantum-size effects in the produced wires were investigated by measuring the photoluminescence spectra at both low and room temperature. An intense room temperature PL peak centered around 690 nm with FWHM of 180 nm showed the promise of MIG-Si nanowires for red light-emitting diode applications. In addition, self-aligned silicide film on the bottom provides an ultimate back Ohmic contact, which significantly simplifies the fabrication of optoelectronic devices.

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