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https://www.readbyqxmd.com/read/28821072/understanding-the-mechanisms-of-oxygen-diffusion-through-surface-functionalized-nanocellulose-films
#1
Maria Soledad Peresin, Kari Kammiovirta, Harri Heikkinen, Leena-Sisko Johansson, Jari Vartiainen, Harri Setälä, Monika Österberg, Tekla Tammelin
A concept for direct surface modification on self-standing films of cellulose nanofibrils (CNF) is demonstrated using an aminosilane group in cellulose compatible solvent (dimethyl acetamide, DMA). The chemically modified structure efficiently prevents the oxygen molecules from interacting with the nanocellulose film in the presence of water molecules. Oxygen permeability values lower than 1mLmmm(-2)day(-1)atm(-1) were achieved at extremely high levels of relative humidity (RH95%). The aminosilane reaction is compared to conventional hydrophobization reaction using hexamethyldisilazane...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820569/selective-ru-ald-as-a-catalyst-for-sub-7-nm-bottom-up-metal-interconnects
#2
Ivan Zyulkov, Mikhail Krishtab, Stefan De Gendt, Silvia Armini
Integrating bottom-up area-selective building-blocks in microelectronics has a disruptive potential because of the unique capability of engineering new structures and architectures. Atomic layer deposition (ALD) is an enabling technology, yet understanding the surfaces and their modification is crucial to leverage area-selective ALD (AS-ALD) in this field. The understanding of general selectivity mechanisms and the compatibility of plasma surface modifications with existing materials and processes, both at research and production scale, will greatly facilitate AS-ALD integration in microelectronics...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28816386/chemotaxis-guided-hybrid-neutrophil-micromotor-for-actively-targeted-drug-transport
#3
Jingxin Shao, Mingjun Xuan, Hongyue Zhang, Xiankun Lin, Zhiguang Wu, Qiang He
Engineering self-propelled micromotors with good biocompatibility and biodegradability for actively seeking sites of diseases and targeted drug transport remains a huge challenge. Here we demonstrate that neutrophils with intrinsic chemotaxis ability could be transformed into self-guided biohybrid motors through integrating mesoporous silica nanoparticles (MSNs) with high loading capability. To realize the compatibility of neutrophil cells with drug-loaded MSNs, bacteria membranes derived from E. coli were coated onto MSNs in advance by using a camouflaging strategy...
August 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28814008/self-aligning-exoskeleton-hip-joint-kinematic-design-with-five-revolute-three-prismatic-and-one-ball-joint
#4
Jonas Beil, Charlotte Marquardt, Tamim Asfour
Kinematic compatibility is of paramount importance in wearable robotic and exoskeleton design. Misalignments between exoskeletons and anatomical joints of the human body result in interaction forces which make wearing the exoskeleton uncomfortable and even dangerous for the human. In this paper we present a kinematically compatible design of an exoskeleton hip to reduce kinematic incompatibilities, so called macro- and micro-misalignments, between the human's and exoskeleton's joint axes, which are caused by inter-subject variability and articulation...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28812982/quantitative-criteria-to-benchmark-new-and-existing-bio-inks-for-cell-compatibility
#5
Karen Dubbin, Anthony Tabet, Sarah Heilshorn
Recent advancements in 3D bioprinting have led to the fabrication of more complex, more precise, and larger printed tissue constructs. As the field continues to advance, it is critical to develop quantitative benchmarks to compare different bio-inks for key cell-biomaterial interactions, including (1) cell sedimentation within the ink cartridge, (2) cell viability during extrusion, and (3) cell viability after ink curing. Here we develop three simple protocols for quantitative analysis of bio-ink performance...
August 16, 2017: Biofabrication
https://www.readbyqxmd.com/read/28811879/growth-and-fecundity-of-fertile-miscanthus%C3%A2-%C3%A3-%C3%A2-giganteus-powercane-compared-to-feral-and-ornamental-miscanthus-sinensis-in-a-common-garden-experiment-implications-for-invasion
#6
Maria N Miriti, Tahir Ibrahim, Destiny Palik, Catherine Bonin, Emily Heaton, Evans Mutegi, Allison A Snow
Perennial grasses are promising candidates for bioenergy crops, but species that can escape cultivation and establish self-sustaining naturalized populations (feral) may have the potential to become invasive. Fertile Miscanthus × giganteus, known as "PowerCane," is a new potential biofuel crop. Its parent species are ornamental, non-native Miscanthus species that establish feral populations and are sometimes invasive in the USA. As a first step toward assessing the potential for "PowerCane" to become invasive, we documented its growth and fecundity relative to one of its parent species (Miscanthus sinensis) in competition with native and invasive grasses in common garden experiments located in Columbus, Ohio and Ames, Iowa, within the targeted range of biofuel cultivation...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28809073/biocatalytic-stimuli-responsive-asymmetric-triblock-terpolymer-membranes-for-localized-permeability-gating
#7
Jennifer L Poole, Scott Donahue, David Wilson, Yuk Mun Li, Qi Zhang, Yibei Gu, Rachel Ferebee, Zhao Lu, Rachel Mika Dorin, Lawrence F Hancock, Larry Takiff, Ilhem F Hakem, Michael R Bockstaller, Ulrich Wiesner, Jeremy Walker
The functionalization with phosphotriesterase of poly(isoprene-b-styrene-b-4-vinylpyridine)-based nanoporous membranes fabricated by self-assembly and nonsolvent induced phase separation (SNIPS) is shown to enable dynamically responsive membranes capable of substrate-specific and localized gating response. Integration of the SNIPS process with macroporous nylon support layers yields mechanically robust textile-type films with high moisture vapor transport rates that display rapid and local order-of-magnitude modulation of permeability...
August 15, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28795726/a-hollow-fiber-system-for-simple-generation-of-human-brain-organoids
#8
Yujuan Zhu, Li Wang, Fangchao Yin, Yue Yu, Yaqing Wang, Hui Liu, Hui Wang, Ning Sun, Haitao Liu, Jianhua Qin
3D organoids exhibit near-physiological morphogenesis and histology relying on the self-organization of human pluripotent stem cells (hPSCs), representing a new class of in vitro model for studying developmental biology and diseases. An engineered approach is highly desirable to generate sufficient organoids in a simple and efficient manner. Herein, we present a new strategy for the simple formation of massive human brain organoids from hiPSCs within a hollow fiber reactor system by combining fiber materials with the developmental biology principle...
August 10, 2017: Integrative Biology: Quantitative Biosciences From Nano to Macro
https://www.readbyqxmd.com/read/28777316/mechanical-performance-evaluation-of-self-compacting-concrete-with-fine-and-coarse-recycled-aggregates-from-the-precast-industry
#9
Sara A Santos, Pedro R da Silva, Jorge de Brito
This paper intends to evaluate the feasibility of reintroducing recycled concrete aggregates in the precast industry. The mechanical properties of self-compacting concrete (SCC) with incorporation of recycled aggregates (RA) (coarse recycled aggregates (CRA) and fine recycled aggregates (FRA)) from crushed precast elements were evaluated. The goal was to evaluate the ability of producing SCC with a minimum pre-established performance in terms of mechanical strength, incorporating variable ratios of RA (FRA/CRA%: 0/0%, 25/25%, 50/50%, 0/100% and 100/0%) produced from precast source concretes with similar target performances...
August 4, 2017: Materials
https://www.readbyqxmd.com/read/28752663/platelet-production-from-induced-pluripotent-stem-cells
#10
N Sugimoto, K Eto
Ex vivo production of human platelets has been pursued as an alternative measure to resolve limitations in the supply and safety of current platelet transfusion products. To this end, induced pluripotent stem cells (iPSCs) are considered an ideal global source, as they are not only pluripotent and self-renewing, but are also available from basically any person, have relatively few ethical issues, and are easy to manipulate. From human iPSCs, megakaryocyte (MK) lines with robust proliferation capacity have been established by the introduction of specified sets of genes...
July 28, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28740864/metal-nanoparticle-film-based-room-temperature-coulomb-transistor
#11
Svenja Willing, Hauke Lehmann, Mirjam Volkmann, Christian Klinke
Single-electron transistors would represent an approach to developing less power-consuming microelectronic devices if room temperature operation and industry-compatible fabrication were possible. We present a concept based on stripes of small, self-assembled, colloidal, metal nanoparticles on a back-gate device architecture, which leads to well-defined and well-controllable transistor characteristics. This Coulomb transistor has three main advantages. By using the scalable Langmuir-Blodgett method, we combine high-quality chemically synthesized metal nanoparticles with standard lithography techniques...
July 2017: Science Advances
https://www.readbyqxmd.com/read/28733149/a-comprehensive-pain-assessment-tool-compat-for-chronic-pancreatitis-development-face-validation-and-pilot-evaluation
#12
K Teo, M H Johnson, A M Drewes, J A Windsor
BACKGROUND/OBJECTIVES: Chronic pancreatitis (CP) pain is challenging to treat. Treatment selection is hampered by there being no validated pain assessment tool that accounts for the complexity of CP pain and its underlying mechanisms. This study aims to develop a comprehensive pain assessment tool (COMPAT) specific for CP, evaluate its face validity with experts and patients and test it with a pilot cohort of patients. METHODS: COMPAT was developed from existing pain assessment tools and a literature review...
July 8, 2017: Pancreatology: Official Journal of the International Association of Pancreatology (IAP) ... [et Al.]
https://www.readbyqxmd.com/read/28731588/human-leukocyte-antigen-distribution-and-genomic-ancestry-in-brazilian-patients-with-sickle-cell-disease
#13
M C F da Silva-Malta, P S Rodrigues, L W Zuccherato, F C B de Souza, E M F L Domingues, V R Souza, E Tarazona-Santos, M L Martins
Hematopoietic stem-cell transplantation (HSCT) is currently the only established curative treatment for sickle cell disease (SCD), but is limited by donor availability. Ethnicity is thought to have an impact on the complications experienced by patients that undergo HSCT and on the likelihood of identifying an HLA matched donor. In the present study, we investigated the genomic ancestry and the distribution of HLA allele groups in Brazilian patients with SCD, compared these HLA profiles to worldwide populations and evaluate the availability of HLA-matched donors...
July 21, 2017: HLA
https://www.readbyqxmd.com/read/28729872/plc-mediated-signaling-pathway-in-pollen-tubes-regulates-the-gametophytic-self-incompatibility-of-pyrus-species
#14
Haiyong Qu, Yaqin Guan, Yongzhang Wang, Shaolin Zhang
Among the Rosaceae species, the gametophytic self-incompatibility (GSI) is controlled by a single multi-allelic S locus, which is composed of the pistil-S and pollen-S genes. The pistil-S gene encodes a polymorphic ribonuclease (S-RNase), which is essential for identifying self-pollen. However, the S-RNase system has not been fully characterized. In this study, the self-S-RNase inhibited the Ca(2+)-permeable channel activity at pollen tube apices and the selectively decreased phospholipase C (PLC) activity in the plasma membrane of Pyrus pyrifolia pollen tubes...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28729522/site-controlled-and-advanced-epitaxial-ge-si-quantum-dots-fabrication-properties-and-applications
#15
Moritz Brehm, Martyna Grydlik
In this review, we report on fabrication paths, challenges, and emerging solutions to integrate group-IV epitaxial quantum dots (QDs) as active light emitters into the existing standard Si technology. Their potential as laser gain material for the use of optical intra- and inter-chip interconnects as well as possibilities to combine a single-photon-source-based quantum cryptographic means with Si technology will be discussed. We propose that the mandatory addressability of the light emitters can be achieved by a combination of organized QD growth assisted by templated self-assembly, and advanced inter-QD defect engineering to boost the optical emissivity of group-IV QDs at room-temperature...
July 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28722132/evolution-of-the-selfing-syndrome-anther-orientation-and-herkogamy-together-determine-reproductive-assurance-in-a-self-compatible-plant
#16
Per Toräng, Linus Vikström, Jörg Wunder, Stefan Wötzel, George Coupland, Jon Ågren
Capacity for autonomous self-fertilization provides reproductive assurance, has evolved repeatedly in the plant kingdom, and typically involves several changes in flower morphology and development (the selfing syndrome). Yet, the relative importance of different traits and trait combinations for efficient selfing and reproductive success in pollinator-poor environments is poorly known. In a series of experiments, we tested the importance of anther-stigma distance and the less studied trait anther orientation for efficiency of selfing in the perennial herb Arabis alpina...
July 19, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28716401/research-on-the-parallel-load-sharing-principle-of-a-novel-self-decoupled-piezoelectric-six-dimensional-force-sensor
#17
Ying-Jun Li, Cong Yang, Gui-Cong Wang, Hui Zhang, Huan-Yong Cui, Yong-Liang Zhang
This paper presents a novel integrated piezoelectric six-dimensional force sensor which can realize dynamic measurement of multi-dimensional space load. Firstly, the composition of the sensor, the spatial layout of force-sensitive components, and measurement principle are analyzed and designed. There is no interference of piezoelectric six-dimensional force sensor in theoretical analysis. Based on the principle of actual work and deformation compatibility coherence, this paper deduces the parallel load sharing principle of the piezoelectric six-dimensional force sensor...
July 14, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28715014/amyloid-scaffolds-as-alternative-chlorosomes
#18
REVIEW
Rolando F Rengifo, Noel X Li, Anthony Sementilli, David G Lynn
Living systems contain remarkable functional capability built within sophisticated self-organizing frameworks. Defining the assembly codes that coordinate these systems could greatly extend nanobiotechnology. To that end, we have highlighted the self-assembling architecture of the chlorosome antenna arrays and report the emulation and extension of their features for the development of cell-compatible photoredox materials. We specifically review work on amyloid peptide scaffolds able to (1) organize light-harvesting chromophores, (2) break peptide bilayer symmetry for directional energy and electron transfer, and (3) incorporate redox active metal ions at high density for energy storage...
July 17, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28708450/a-comparison-of-kenyan-biomphalaria-pfeifferi-and-b-sudanica-as-vectors-for-schistosoma-mansoni-including-a-discussion-of-the-need-to-better-understand-the-effects-of-snail-breeding-systems-on-transmission
#19
Martin Mutuku, Lijun Lu, Fredrick Otiato, Ibrahim Ndungu Mwangi, Joseph Mutonga Kinuthia, Geoffrey Murai Maina, Martina Rose Laidemitt, Eric Agola Lelo, Horace Ochanda, Eric Samuel Loker, Gerald Mwandori Mkoji
In Kenya, schistosomes infect an estimated 6 million people with >30 million people at risk of infection. We compared compatibility with, and ability to support and perpetuate, Schistosoma mansoni of Biomphalaria pfeifferi and Biomphalaria sudanica, 2 prominent freshwater snail species involved in schistosomiasis transmission in Kenya. Field-derived B. pfeifferi (from a stream in Mwea, central Kenya) and B. sudanica (from Nawa, Lake Victoria, in western Kenya) were exposed to S. mansoni miracidia isolated from fecal samples of naturally infected humans from Mwea or Nawa...
July 14, 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/28708005/taurine-protects-lens-epithelial-cells-against-ultraviolet-b-induced-apoptosis
#20
Wu Dayang, Pang Dongbo
BACKGROUND: The massive uptake of compatible osmolytes is a self-protective response shared by lens exposed to hypertonic stress and ultraviolet stress. OBJECTIVE: This study aimed to investigate the protective effects of taurine against ultraviolet B-induced cytotoxicity in the lens epithelial cells. METHODS: Real-time PCR was used to measure osmolytes transport. Radioimmunoassay was used to measure osmolytes uptake. Cell counting kit-8 assays were used to measure cellular viability...
July 14, 2017: Current Eye Research
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