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https://www.readbyqxmd.com/read/28811526/observation-of-the-unexpected-morphology-of-graphene-wrinkle-on-copper-substrate
#1
Wen Wang, Shudu Yang, Ashu Wang
Graphene, a two-dimensional material, has a wide range of unique properties and could be used in the development of varieties of mechanic, electronic and photonic devices, therefore methods to synthesis large-area high-quality graphene films are urgently required. Chemical vapor deposition (CVD) has been of particular interest recently due to its simplicity and low cost. However, because of the mismatch of thermal expansion coefficients, high densities of wrinkles are commonly observed. Despite their prevalence and potential impact on large-scale graphene properties, relatively little is known about their structural morphology and formation mechanism...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28810554/beneficial-effects-of-dried-pomegranate-juice-concentrated-powder-on-ultraviolet-b-induced-skin-photoaging-in-hairless-mice
#2
Su-Jin Kang, Beom-Rak Choi, Seung-Hee Kim, Hae-Yeon Yi, Hye-Rim Park, Chang-Hyun Song, Sae-Kwang Ku, Young-Joon Lee
The present study investigated the anti-aging effects of pomegranate juice concentrated powder (PCP) in hairless mice following 15 weeks of UVB irradiation (three times a week; 0.18 J/cm(2)). Skin moisturizing effects were evaluated through skin water, collagen type I and hyaluronan contents, as well as collagen type I and hyaluronan synthesis-related transcript levels. Wrinkle formation and edema scores (skin weights) were also assessed, along with skin matrix metalloproteinase (MMP)-1, MMP-9 and MMP-13 transcript levels...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28810000/effect-of-a-blueberry-derived-antioxidant-matrix-on-infrared-a-induced-gene-expression-in-human-dermal-fibroblasts
#3
Susanne Grether-Beck, Jean Krutmann, Katherine Wilkens, Kasey D'Amato
<p>There is compelling evidence that Infrared A (IRA) from natural sunlight contributes to photoaging of human skin by inducing the expression of matrix metalloproteinase-1 (MMP-1) expression in human dermal fibroblasts. Corresponding mechanistic studies have shown that IRA does so by increasing the production of reactive oxygen species in irradiated cells. In the present study, we therefore asked if treatment of primary human skin fibroblasts with a blueberry-derived antioxidant matrix (BerrimatrixTM), which is employed as an active ingredient in commercially available skin care products that are topically applied, can prevent IRA-induced MMP-1 expression in these cells...
August 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28808192/classification-of-facial-wrinkles-among-chinese-women
#4
Jiechen Zhang, Wei Hou, Suying Feng, Xiangsheng Chen, Hongwei Wang
It is generally recognized that Caucasians and Asians have different skin aging features. The aim of this study was to develop a facial wrinkle grading scale for Chinese women. Standard photographs were taken of 242 Chinese women. Six sets of 0 to 9 wrinkle scales with reference photographs and descriptions were selected, including grading scales for resting and hyperkinetic crow's feet, frontalis lines, glabellar frown lines, and nasolabial folds. To identify the scale by objective quantitative measurement, skin surface measurements from the Visioscan(®) VC98 were used...
January 19, 2017: Journal of Biomedical Research
https://www.readbyqxmd.com/read/28807865/novel-compound-heterozygous-mutations-identified-by-whole-exome-sequencing-in-a-japanese-patient-with-geroderma-osteodysplastica
#5
Ryojun Takeda, Masaki Takagi, Hiroyuki Shinohara, Hiroshi Futagawa, Satoshi Narumi, Tomonobu Hasegawa, Gen Nishimura, Hiroshi Yoshihashi
Geroderma osteodysplastica (GO) is a subtype of cutis laxa syndrome characterized by congenital wrinkly skin, a prematurely aged face, extremely short stature, and osteoporosis leading to recurrent fractures. GO exhibits an autosomal recessive inheritance pattern and is caused by loss-of-function mutations in GORAB, which encodes a protein important for Golgi-related transport. Using whole exome sequencing, we identified novel compound heterozygous nonsense mutations in the GORAB in a GO patient. The patient was a 14-year-old Japanese boy...
August 11, 2017: European Journal of Medical Genetics
https://www.readbyqxmd.com/read/28805869/wrinkle-stabilized-metal-graphene-hybrid-fibers-with-zero-temperature-coefficient-of-resistance
#6
Bo Fang, Jiabin Xi, Yingjun Liu, Fan Guo, Zhen Xu, Weiwei Gao, Daoyou Guo, Peigang Li, Chao Gao
The interfacial adhesion between graphene and metals is poor, as metals tend to generate superlubricity on smooth graphene surface. This problem renders the free assembly of graphene and metals to be a big challenge, and therefore, some desired conducting properties (e.g., stable metal-like conductivities in air, lightweight yet flexible conductors, and ultralow temperature coefficient of resistance, TCR) likely being realized by integrating the merits of graphene and metals remains at a theoretical level. This work proposes a wrinkle-stabilized approach to address the poor adhesion between graphene surface and metals...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28804267/mathematical-and-computational-modelling-of-skin-biophysics-a-review
#7
REVIEW
Georges Limbert
The objective of this paper is to provide a review on some aspects of the mathematical and computational modelling of skin biophysics, with special focus on constitutive theories based on nonlinear continuum mechanics from elasticity, through anelasticity, including growth, to thermoelasticity. Microstructural and phenomenological approaches combining imaging techniques are also discussed. Finally, recent research applications on skin wrinkles will be presented to highlight the potential of physics-based modelling of skin in tackling global challenges such as ageing of the population and the associated skin degradation, diseases and traumas...
July 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28799690/fluid-driven-interfacial-instabilities-and-turbulence-in-bacterial-biofilms
#8
Stefania Fabbri, Jian Li, Robert P Howlin, Amir Rmaile, Bart Gottenbos, Marko De Jager, E Michelle Starke, Marcelo Aspiras, Marilyn T Ward, Nick G Cogan, Paul Stoodley
Biofilms are thin layers of bacteria embedded within a slime matrix that live on surfaces. They are ubiquitous in nature and responsible for many medical and dental infections, industrial fouling and are also evident in ancient fossils. A biofilm structure is shaped by growth, detachment and response to mechanical forces acting on them. The main contribution to biofilm versatility in response to physical forces is the matrix that provides a platform for the bacteria to grow. The interaction between biofilm structure and hydrodynamics remains a fundamental question concerning biofilm dynamics...
August 11, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28797746/synthesis-of-wrinkled-mesoporous-silica-and-its-reinforcing-effect-for-dental-resin-composites
#9
Ruili Wang, Eric Habib, X X Zhu
OBJECTIVE: The aim of this work is to explore the reinforcing effect of wrinkled mesoporous silica (WMS), which should allow micromechanical resin matrix/filler interlocking in dental resin composites, and to investigate the effect of silica morphology, loading, and compositions on their mechanical properties. METHODS: WMS (average diameter of 496nm) was prepared through the self-assembly method and characterized by the use of the electron microscopy, dynamic light scattering, and the N2 adsorption-desorption measurements...
August 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28797059/general-theory-of-skin-reinforcement
#10
Ilja L Kruglikov, Philipp E Scherer
Macroscopic mechanical properties of human skin in vivo cannot be considered independent of adjacent subcutaneous white adipose tissue (sWAT). The layered system skin/sWAT appears as the hierarchical structural composite in which single layers behave as fiber-reinforced structures. Effective macroscopic mechanical properties of such composites are mainly determined either by the properties of the skin or by those of the sWAT, dependent on the conditions of mechanical loading. Mechanical interactions between the skin and the adjacent sWAT associated with a mismatch in the mechanical moduli of these two layers can lead to production of the skin wrinkles...
2017: PloS One
https://www.readbyqxmd.com/read/28795567/buckled-thin-film-transistors-and-circuits-on-soft-elastomers-for-stretchable-electronics
#11
Giuseppe Cantarella, Christian Vogt, Raoul Hopf, Niko Münzenrieder, Panagiotis Andrianakis, Luisa Petti, Alwin Daus, Stefan Knobelspies, Lars Büthe, Gerhard Troester, Giovanni A Salvatore
Although recent progress in the field of flexible electronics has allowed the realization of biocompatible and conformable electronics, systematic approaches which combine high bendability (< 3 mm bending radius), high stretchability ( > 3-4 %) and low complexity in the fabrication process are still missing. Here, we show a technique to induce randomly-oriented and customized wrinkles on the surface of a biocompatible elastomeric substrate, where Thin-Film Transistors (TFTs) and circuits (inverter and logic NAND gates) based on Amorphous-IGZO are fabricated...
August 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28791196/simulated-bacterial-infection-disrupts-the-circadian-fluctuation-of-immune-cells-in-wrinkle-lipped-bats-chaerephon-plicatus
#12
Philipp Weise, Gábor A Czirják, Oliver Lindecke, Sara Bumrungsri, Christian C Voigt
BACKGROUND: Leukocyte concentrations follow a circadian pattern in mammals, with elevated values at times of potential contact with pathogens and parasites. We hypothesized that this pattern is disturbed after an immune challenge. METHODS: In Thailand, we captured wrinkle-lipped bats (Chaerephon plicatus), when they returned to their colony at dawn. We challenged half of the animals (experimental group) with bacterial lipopolysaccharides and treated the others only with the carrier liquid (control group)...
2017: PeerJ
https://www.readbyqxmd.com/read/28782356/from-growth-surface-to-device-interface-preserving-metallic-fe-under-monolayer-hexagonal-boron-nitride
#13
Sabina Caneva, Marie-Blandine Martin, Lorenzo D'Arsie', Adrianus Indrat Aria, Hikmet Sezen, Matteo Amati, Luca Gregoratti, Hisashi Sugime, Santiago Esconjauregui, John Robertson, Stephan Hofmann, Robert S Weatherup
We investigate the interfacial chemistry between Fe catalyst foils and monolayer hexagonal boron nitride (h-BN) following chemical vapour deposition and during subsequent atmospheric exposure, using scanning electron microscopy, X-ray photoemission spectroscopy, and scanning photoelectron microscopy. We show that regions of the Fe surface covered by h-BN remain in a reduced state during exposure to moist air for ~40 hours at room temperature. This protection is attributed to the strong interfacial interaction between h-BN and Fe, which prevents the rapid intercalation of oxidizing species...
August 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28777531/sheet-collapsing-approach-for-rubber-like-graphene-papers
#14
Youhua Xiao, Zhen Xu, Yingjun Liu, Li Peng, Jiabin Xi, Bo Fang, Fan Guo, Peng Li, Chao Gao
Understanding and modulating the conformation of graphene play pivotal roles in designing graphene macroscopic materials. Here, we revealed the sheet collapsing behavior of graphene oxide (GO) sheets by poor solvents in an analogy with linear macromolecules. Triggered by poor solvents, extended GO sheets in good solvents can collapse to hierarchically wrinkled conformations. The collapsing behavior of GO enabled the fabrication of amorphous self-standing GO and graphene papers with rich hierarchical wrinkles and folds over mutliple size scales...
August 4, 2017: ACS Nano
https://www.readbyqxmd.com/read/28770671/marine-algae-as-attractive-source-to-skin-care
#15
Jean-Yves Berthon, Rachida Nachat-Kappes, Mathieu Bey, Jean-Paul Cadoret, Isabelle Renimel, Edith Filaire
As the largest organ in the human body, the skin has multiple functions of which one of the most important is the protection against various harmful stressors. The keratinised stratified epidermis and an underlying thick layer of collagen-rich dermal connective tissues are important components of the skin. The environmental stressors such as ultraviolet radiation (UVR) and pollution increase the levels of reactive oxygen species (ROS), contributing to clinical manifestations such as wrinkle formation and skin aging...
June 2017: Free Radical Research
https://www.readbyqxmd.com/read/28765852/one-pot-preparation-of-polymer-microspheres-having-wrinkled-hard-surfaces-through-self-assembly-of-silica-nanoparticles
#16
Nanami Hano, Makoto Takafuji, Hirotaka Ihara
Polymer microspheres with wrinkled hard surfaces composed of self-assembled silica nanoparticles were prepared via suspension polymerization. The polymer surface morphology could be controlled by changing the silica nanoparticle concentration in the monomer droplets. The wrinkles could trap small polystyrene particles in their grooves, thus demonstrating viability in separation science.
August 2, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28764734/development-of-a-core-outcome-set-for-clinical-trials-in-facial-aging-study-protocol-for-a-systematic-review-of-the-literature-and-identification-of-a-core-outcome-set-using-a-delphi-survey
#17
Daniel I Schlessinger, Sanjana Iyengar, Arianna F Yanes, Jill K Henley, Hovik J Ashchyan, Anastasia O Kurta, Payal M Patel, Umar A Sheikh, Matthew J Franklin, Courtney C Hanna, Brian R Chen, Sarah G Chiren, Jochen Schmitt, Stefanie Deckert, Karina C Furlan, Emily Poon, Ian A Maher, Todd V Cartee, Joseph F Sobanko, Murad Alam
BACKGROUND: Facial aging is a concern for many patients. Wrinkles, loss of volume, and discoloration are common physical manifestations of aging skin. Genetic heritage, prior ultraviolet light exposure, and Fitzpatrick skin type may be associated with the rate and type of facial aging. Although many clinical trials assess the correlates of skin aging, there is heterogeneity in the outcomes assessed, which limits the quality of evaluation and comparison of treatment modalities. To address the inconsistency in outcomes, in this project we will develop a core set of outcomes that are to be evaluated in all clinical trials relevant to facial aging...
August 1, 2017: Trials
https://www.readbyqxmd.com/read/28764648/association-mapping-of-starch-chain-length-distribution-and-amylose-content-in-pea-pisum-sativum-l-using-carbohydrate-metabolism-candidate-genes
#18
Margaret A Carpenter, Martin Shaw, Rebecca D Cooper, Tonya J Frew, Ruth C Butler, Sarah R Murray, Leire Moya, Clarice J Coyne, Gail M Timmerman-Vaughan
BACKGROUND: Although starch consists of large macromolecules composed of glucose units linked by α-1,4-glycosidic linkages with α-1,6-glycosidic branchpoints, variation in starch structural and functional properties is found both within and between species. Interest in starch genetics is based on the importance of starch in food and industrial processes, with the potential of genetics to provide novel starches. The starch metabolic pathway is complex but has been characterized in diverse plant species, including pea...
August 1, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28762645/efficacy-and-tolerability-of-a-double-conjugated-retinoid-cream-vs-1-0-retinol-cream-or-0-025-tretinoin-cream-in-subjects-with-mild-to-severe-photoaging
#19
David H McDaniel, Christopher Mazur, Mitchell S Wortzman, Diane B Nelson
BACKGROUND: Topical retinoids are used to treat the visible signs of photoaging. While efficacious, they are irritating. OBJECTIVE: Evaluate the effectiveness and tolerability of a double-conjugate retinoid cream (AlphaRet Overnight Cream; AHA-Ret) in improving visible signs of photoaging vs 1.0% retinol or 0.025% tretinoin. METHODS: A 12-week, split-face, randomized trial was conducted in 48 female subjects, aged 30-65 years with mild to severe photodamage...
August 1, 2017: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/28762269/intrinsically-stretchable-nanostructured-silver-electrodes-for-realizing-efficient-strain-sensors-and-stretchable-organic-photovoltaics
#20
Yang-Yen Yu, Chien-Hsun Chen, Chu-Chen Chueh, Chun-Ying Chiang, Jang-Hsing Hsieh, Chih-Ping Chen, Wen-Chang Chen
In this study, a new hybrid electrode featuring a high gauge factor of >30, decent stretchability (100% of the original conductivity can be retained after 50 cycles of stretching under a 20% strain without prestrain treatment), high transmittance (>70%) across 400-900 nm, and a good sheet resistance (<50 Ω sq(-1)) was successfully exploited. These superior properties were revealed to originate from the reversible phase separation endowed by the nanogranular-like morphology formed in Ag. Owing to such discrete nanomorphology, the free volume within this Ag electrode is susceptible to the applied tensile strain and the ensuing change in conductivity enables the realization of an efficient strain sensor...
August 9, 2017: ACS Applied Materials & Interfaces
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