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https://www.readbyqxmd.com/read/28731273/scaffold-free-liver-on-a-chip-with-multiscale-organotypic-cultures
#1
Yu-Shih Weng, Shau-Feng Chang, Ming-Cheng Shih, Shih-Heng Tseng, Chih-Huang Lai
The considerable advances that have been made in the development of organotypic cultures have failed to overcome the challenges of expressing tissue-specific functions and complexities, especially for organs that require multitasking and complex biological processes, such as the liver. Primary liver cells are ideal biological building blocks for functional organotypic reconstruction, but are limited by their rapid loss of physiological integrity in vitro. Here the concept of lattice growth used in material science is applied to develop a tissue incubator, which provides physiological cues and controls the 3D assembly of primary cells...
July 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28730936/an-industry-update-what-is-the-latest-news-in-therapeutic-delivery
#2
Iain Simpson
This Industry Update covers the period from 1 through 30 April 2017, and is based on information sourced from company press releases, scientific literature, patents and various news websites. Biogen expanded its portfolio of developmental drugs targeting neurological diseases by licensing a drug from Bristol-Myers Squibb which is currently under investigation for the treatment of progressive supranuclear palsy. Takeda announced a deal with NuBiyota focused on developing treatments for gastrointestinal disorders, based on the manipulation of microbes living in the gut...
July 2017: Therapeutic Delivery
https://www.readbyqxmd.com/read/28729522/site-controlled-and-advanced-epitaxial-ge-si-quantum-dots-fabrication-properties-and-applications
#3
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/28726908/mn-4-li-co-doped-srmgal10o17-phosphor-in-glass-application-in-high-power-warm-w-leds
#4
Jiasong Zhong, Wei Xu, Qingli Chen, Shuo Yuan, Zhengguo Ji, Daqin Chen
Currently, the shortage of red components and easy aging of organic silicone still remain challenges for high-power phosphor-converted warm white light-emitting diodes (w-LEDs). Aiming to alleviate these issues, phosphor-in-glass (PiG), fabricated by co-sintering red- and yellow-emitting phosphors and low-melting glass, has been regarded as a promising color converter for w-LEDs. In this study, a Li(+),Mn(4+) co-doped SrMgAl10O17 red phosphor was synthesized via a conventional solid-state reaction. The as-prepared phosphor exhibits a deep red emission, ascribed to Mn(4+):(2)Eg → (4)A2g spin-forbidden transition in the range of 600-700 nm with a narrow-band full width at half maximum of 55 nm, and provides an ideal broadband excitation extending from 250 to 530 nm...
July 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28726847/mapping-genome-wide-transcription-factor-binding-sites-using-dap-seq
#5
Anna Bartlett, Ronan C O'Malley, Shao-Shan Carol Huang, Mary Galli, Joseph R Nery, Andrea Gallavotti, Joseph R Ecker
To enable low-cost, high-throughput generation of cistrome and epicistrome maps for any organism, we developed DNA affinity purification sequencing (DAP-seq), a transcription factor (TF)-binding site (TFBS) discovery assay that couples affinity-purified TFs with next-generation sequencing of a genomic DNA library. The method is fast, inexpensive, and more easily scaled than chromatin immunoprecipitation sequencing (ChIP-seq). DNA libraries are constructed using native genomic DNA from any source of interest, preserving cell- and tissue-specific chemical modifications that are known to affect TF binding (such as DNA methylation) and providing increased specificity as compared with in silico predictions based on motifs from methods such as protein-binding microarrays (PBMs) and systematic evolution of ligands by exponential enrichment (SELEX)...
August 2017: Nature Protocols
https://www.readbyqxmd.com/read/28724901/real-time-and-label-free-chemical-sensor-on-a-chip-using-monolithic-si-on-batio3-mid-infrared-waveguides
#6
Tiening Jin, Leigang Li, Bruce Zhang, Hao-Yu Greg Lin, Haiyan Wang, Pao Tai Lin
Chip-scale chemical detection is demonstrated by using mid-Infrared (mid-IR) photonic circuits consisting of amorphous silicon (a-Si) waveguides on an epitaxial barium titanate (BaTiO3, BTO) thin film. The highly c-axis oriented BTO film was grown by the pulsed laser deposition (PLD) method and it exhibits a broad transparent window from λ = 2.5 μm up to 7 μm. The waveguide structure was fabricated by the complementary metal-oxide-semiconductor (CMOS) process and a sharp fundamental waveguide mode has been observed...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724092/can-biochar-covers-reduce-emissions-from-manure-lagoons-while-capturing-nutrients
#7
Brian Dougherty, Myles Gray, Mark G Johnson, Markus Kleber
The unique physical and chemical properties of biochars make them promising materials for odor, gas, and nutrient sorption. Floating covers made from organic materials (biocovers) are one option for reducing odor and gas emissions from livestock manure lagoons. This study evaluated the potential of floating biochar covers to reduce odor and gas emissions while simultaneously sorbing nutrients from liquid dairy manure. This new approach has the potential to mitigate multiple environmental problems. Two biochars were tested: one made via gasification of Douglas fir chips at 650°C (FC650), and the other made from a mixture of Douglas fir [ (Mirb...
May 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28723109/fast-surface-acoustic-wave-based-sensors-to-investigate-the-kinetics-of-gas-uptake-in-ultra-microporous-frameworks
#8
Benjamin Paschke, Achim Wixforth, Dmytro Denysenko, Dirk Volkmer
Observation of the kinetics and measurement of the activation energies for gas diffusion in porous materials requires very fast and sensitive sensors. In this work, thin films of metal-organic frameworks (MOFs) with different pore sizes are grown on a surface acoustic wave (SAW) substrate, resulting in very sensitive and specific sensor systems for the detection of various gases at very short time scales. Using specially designed SAW delay lines for the detection, up to 200-nm-wide cubic MOF crystals were grown directly from a solution on the sensitive sensor chip area...
June 23, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28713851/building-an-experimental-model-of-the-human-body-with-non-physiological-parameters
#9
Joseph M Labuz, Christopher Moraes, David R Mertz, Brendan M Leung, Shuichi Takayama
New advances in engineering and biomedical technology have enabled recent efforts to capture essential aspects of human physiology in microscale, in-vitro systems. The application of these advances to experimentally model complex processes in an integrated platform - commonly called a 'human-on-a-chip (HOC)' - requires that relevant compartments and parameters be sized correctly relative to each other and to the system as a whole. Empirical observation, theoretical treatments of resource distribution systems and natural experiments can all be used to inform rational design of such a system, but technical and fundamental challenges (e...
March 2017: Technology
https://www.readbyqxmd.com/read/28712291/programming-cell-adhesion-for-on-chip-sequential-boolean-logic-functions
#10
Xiangmeng Qu, Shaopeng Wang, Zhilei Ge, Jianbang Wang, Guangbao Yao, Jiang Li, Xiaolei Zuo, Jiye Shi, Shiping Song, Lihua Wang, Li Li, Hao Pei, Chunhai Fan
Programmable remodelling of cell surfaces enables high-precision regulation of cell behavior. In this work, we developed in-vitro constructed DNA-based chemical reaction networks (CRNs) to program on-chip cell adhesion. We found that the RGD-functionalized DNA CRNs are entirely non-invasive when interfaced with the fluidic mosaic membrane of living cells. DNA toehold with different lengths could tunably alter the release kinetics of cells, which shows rapid release in minutes with the use of a 6-base toehold...
July 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28709053/transport-and-retention-of-biochar-nanoparticles-in-a-paddy-soil-under-environmentally-relevant-solution-chemistry-conditions
#11
Ming Chen, Dengjun Wang, Fan Yang, Xiaoyun Xu, Nan Xu, Xinde Cao
Land application of biochar has been increasingly recommended as a powerful strategy for carbon sequestration and soil remediation. However, the biochar particles, especially those in the nanoscale range, may migrate or carry the inherent contaminants along the soil profile, posing a potential risk to the groundwater. This study investigated the transport and retention of wood chip-derived biochar nanoparticles (NPs) in water-saturated columns packed with a paddy soil. The environmentally-relevant soil solution chemistry including ionic strength (0...
July 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28702006/the-conserved-actinobacterial-two-component-system-mtrab-coordinates-chloramphenicol-production-with-sporulation-in-streptomyces-venezuelae-nrrl-b-65442
#12
Nicolle F Som, Daniel Heine, Neil A Holmes, John T Munnoch, Govind Chandra, Ryan F Seipke, Paul A Hoskisson, Barrie Wilkinson, Matthew I Hutchings
Streptomyces bacteria make numerous secondary metabolites, including half of all known antibiotics. Production of antibiotics is usually coordinated with the onset of sporulation but the cross regulation of these processes is not fully understood. This is important because most Streptomyces antibiotics are produced at low levels or not at all under laboratory conditions and this makes large scale production of these compounds very challenging. Here, we characterize the highly conserved actinobacterial two-component system MtrAB in the model organism Streptomyces venezuelae and provide evidence that it coordinates production of the antibiotic chloramphenicol with sporulation...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28696342/single-inxga1-xas-nanowire-p-si-heterojunction-based-nano-rectifier-diode
#13
Krishnendu Sarkar, Mainak Palit, Shrabani Guhathakurata, Sanatan Chattopadhyay, Pallab Banerji
Nanoscale power supply units will be indispensable for fabricating next generation smart nanoelectronic integrated circuit. Fabrication of nanoscale rectifier circuits on Si platform is required for integrating nanoelectronic devices with on-chip power supply units. In the present study, a nanorectifier diode based on a single standalone InxGa1-xAs nanowire/p-Si (111) heterojunction fabricated by metal organic chemical vapor deposition technique has been studied. The nanoheterojunction diodes have shown good rectification and fast switching characteristics...
July 11, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28694486/ctcf-binding-landscape-in-jawless-fish-with-reference-to-hox-cluster-evolution
#14
Mitsutaka Kadota, Yuichiro Hara, Kaori Tanaka, Wataru Takagi, Chiharu Tanegashima, Osamu Nishimura, Shigehiro Kuraku
The nuclear protein CCCTC-binding factor (CTCF) contributes as an insulator to chromatin organization in animal genomes. Currently, our knowledge of its binding property is confined mainly to mammals. In this study, we identified CTCF homologs in extant jawless fishes and performed ChIP-seq for the CTCF protein in the Arctic lamprey. Our phylogenetic analysis suggests that the lamprey lineage experienced gene duplication that gave rise to its unique paralog, designated CTCF2, which is independent from the previously recognized duplication between CTCF and CTCFL...
July 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28692647/the-effects-of-kisspeptin-10-on-serum-metabolism-and-myocardium-in-rats
#15
Ying Zhang, Yuanlong Hou, Xiaoyan Wang, Jihui Ping, Zhiyu Ma, Chuan Suo, Zhihai Lei, Xiang Li, Zheng Zhang, Cuicui Jia, Juan Su
Kisspeptin is a peptide encoded by the Kiss 1 gene and is also called metastin. Previous studies have generally focused on several functions of this peptide, including metastasis, puberty, vasoconstriction and reproduction. However, few studies have focused on the cardiac functions of kisspeptin. In the present study, cardiac histomorphology was observed via TEM (transmission electron microscope) and HE and Masson staining to observe instinctive changes. Serum metabolites levels were also measured and analyzed using GC/TOF-MS after injection with kisspeptin-10...
2017: PloS One
https://www.readbyqxmd.com/read/28691077/a-general-small-scale-reactor-to-enable-standardization-and-acceleration-of-photocatalytic-reactions
#16
Chi Chip Le, Michael K Wismer, Zhi-Cai Shi, Rui Zhang, Donald V Conway, Guoqing Li, Petr Vachal, Ian W Davies, David W C MacMillan
Photocatalysis for organic synthesis has experienced an exponential growth in the past 10 years. However, the variety of experimental procedures that have been reported to perform photon-based catalyst excitation has hampered the establishment of general protocols to convert visible light into chemical energy. To address this issue, we have designed an integrated photoreactor for enhanced photon capture and catalyst excitation. Moreover, the evaluation of this new reactor in eight photocatalytic transformations that are widely employed in medicinal chemistry settings has confirmed significant performance advantages of this optimized design while enabling a standardized protocol...
June 28, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28676069/limited-cutaneous-systemic-sclerosis-skin-demonstrates-distinct-molecular-subsets-separated-by-a-cardiovascular-development-gene-expression-signature
#17
Emma C Derrett-Smith, Viktor Martyanov, Cecilia B Chighizola, Pia Moinzadeh, Corrado Campochiaro, Korsa Khan, Tammara A Wood, Pier Luigi Meroni, David J Abraham, Voon H Ong, Robert Lafyatis, Michael L Whitfield, Christopher P Denton
BACKGROUND: Systemic sclerosis (SSc; scleroderma) is an uncommon autoimmune rheumatic disease characterised by autoimmunity, vasculopathy and fibrosis. Gene expression profiling distinguishes scleroderma from normal skin, and can detect different subsets of disease, with potential to identify prognostic biomarkers of organ involvement or response to therapy. We have performed gene expression profiling in skin samples from patients with limited cutaneous SSc (lcSSc). METHODS: Total RNA was extracted from clinically uninvolved skin biopsies of 15 patients with lcSSc and 8 healthy controls (HC)...
July 4, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28673234/genomic-variability-in-mexican-chicken-population-using-copy-number-variants
#18
E Gorla, M C Cozzi, S I Román-Ponce, F J Ruiz López, V E Vega-Murillo, S Cerolini, A Bagnato, M G Strillacci
BACKGROUND: Copy number variations are genome polymorphism that influence phenotypic variation and are an important source of genetic variation in populations. The aim of this study was to investigate genetic variability in the Mexican Creole chicken population using CNVs. RESULTS: The Hidden Markov Model of the PennCNV software detected a total of 1924 CNVs in the genome of the 256 samples processed with Axiom® Genome-Wide Chicken Genotyping Array (Affymetrix)...
July 3, 2017: BMC Genetics
https://www.readbyqxmd.com/read/28671705/organ-body-and-disease-on-a-chip-systems
#19
EDITORIAL
Michael L Shuler
No abstract text is available yet for this article.
July 3, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28670479/looking-to-the-future-of-organs-on-chip
#20
John Greenman
No abstract text is available yet for this article.
June 2017: Future Science OA
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