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https://www.readbyqxmd.com/read/29458204/a-review-of-implantable-biosensors-for-closed-loop-glucose-control-and-other-drug-delivery-applications
#1
Kee Scholten, Ellis Meng
Closed-loop drug delivery promises autonomous control of pharmacotherapy through the continuous monitoring of biomarker levels. For decades, researchers have strived for portable closed-loop systems, capable of treating ambulatory patients with chronic conditions such as diabetes mellitus. After years of development, the first of these systems have left the laboratory and entered commercial use. This long-awaited advance reflects recent development of chronically stable implantable biosensors, able to accurately measure biomarker levels in vivo...
February 16, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29458189/impact-of-time-of-day-on-diffusivity-measures-of-brain-tissue-derived-from-diffusion-tensor-imaging
#2
Cibu Thomas, Neda Sadeghi, Amrita Nayak, Aaron Trefler, Joelle Sarlls, Chris Baker, Carlo Pierpaoli
Diurnal fluctuations in MRI measures of structural and functional properties of the brain have been reported recently. These fluctuations may have a physiological origin, since they have been detected using different MRI modalities, and cannot be explained by factors that are typically known to confound MRI measures. While preliminary evidence suggests that measures of structural properties of the brain based on diffusion tensor imaging (DTI) fluctuate as a function of time-of-day (TOD), the underlying mechanism has not been investigated...
February 16, 2018: NeuroImage
https://www.readbyqxmd.com/read/29458124/tryptophan-mediated-dimerization-of-the-tssl-transmembrane-anchor-is-required-for-type-vi-secretion-system-activity
#3
Abdelrahim Zoued, Jean-Pierre Duneau, Eric Durand, Alexandre P España, Laure Journet, Françoise Guerlesquin, Eric Cascales
The Type VI secretion system (T6SS) is a multiprotein complex used by bacteria to deliver effectors into target cells. The T6SS comprises a bacteriophage-like contractile tail structure anchored to the cell envelope by a membrane complex constituted of the TssJ outer membrane lipoprotein and the TssL and TssM inner membrane proteins. TssJ establishes contact with the periplasmic domain of TssM whereas the transmembrane segments of TssM and its cytoplasmic domain interact with TssL. TssL protrudes in the cytoplasm but is anchored by a C-terminal transmembrane helix (TMH)...
February 16, 2018: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29457856/dual-input-regulation-and-positional-control-in-hybrid-oligonucleotide-discotic-supramolecular-wires
#4
Miguel Ángel Alemán García, Eva Magdalena Estirado, Lech-Gustav Milroy, Luc Brunsveld
The combination of oligonucleotides and synthetic supramolecular systems allows for novel and long needed modes of regulation of the self-assembly of both molecular elements. Discotic molecules were conjugated with short oligonucleotides and their assembly into responsive supramolecular wires studied. The self-assembly of the discotics provides additional stability for DNA-duplex formation due to a cooperative effect. Reversely, the appended oligonucleotides allow for positional control of the discotic elements within the supramolecular wire...
February 19, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29456294/cobalt-containing-bioactive-glasses-reduce-human-mesenchymal-stem-cell-chondrogenic-differentiation-despite-hif-1%C3%AE-stabilisation
#5
E Littmann, H Autefage, A K Solanki, C Kallepitis, J R Jones, M Alini, M Peroglio, M M Stevens
Bioactive glasses (BGs) are excellent delivery systems for the sustained release of therapeutic ions and have been extensively studied in the context of bone tissue engineering. More recently, due to their osteogenic properties and expanding application to soft tissue repair, BGs have been proposed as promising materials for use at the osteochondral interface. Since hypoxia plays a critical role during cartilage formation, we sought to investigate the influence of BGs releasing the hypoxia-mimicking agent cobalt (CoBGs) on human mesenchymal stem cell (hMSC) chondrogenesis, as a novel approach that may guide future osteochondral scaffold design...
March 2018: Journal of the European Ceramic Society
https://www.readbyqxmd.com/read/29455681/human-dendritic-cell-sequestration-onto-the-necator-americanus-larval-sheath-during-ex-sheathing-a-possible-mechanism-for-immune-privilege
#6
A Hassan, D I Pritchard, A M Ghaemmaghami
Despite the profound health implications of Necator americanus infection in humans, many aspects of its interaction with the host immune system are poorly understood. Here we investigated the early events at the interface of N. americanus larvae (L3) and human dendritic cells (DCs). Our data show that co-culturing DCs and the larvae trigger ex-sheathing of hookworms rapidly where a majority of DCs are sequestered onto the larval sheath allowing the ex-sheathed larvae to migrate away unchallenged. Intriguingly, DCs show negligible interaction with the ex-sheathed larvae, alluding to differences between the surface chemistry of the larva and its sheath...
February 19, 2018: Parasitology
https://www.readbyqxmd.com/read/29453846/fabrication-of-miniature-elastomer-lenses-with-programmable-liquid-mold-for-smartphone-microscopy-curing-polydimethylsiloxane-with-in-situ-curvature-control
#7
Bhuvaneshwari Karunakaran, Joseph Tharion, Arvind Ramrao Dhawangale, Debjani Paul, Soumyo Mukherji
Miniature lenses can transform commercial imaging systems, e.g., smartphones and webcams, into powerful, low-cost, handheld microscopes. To date, the reproducible fabrication of polymer lenses is still a challenge as they require controlled dispensing of viscous liquid. This paper reports a reproducible lens fabrication technique using liquid mold with programmable curvature and off-the-shelf materials. The lens curvature is controlled during fabrication by tuning the curvature of an interface of two immiscible liquids [polydimethylsiloxane (PDMS) and glycerol]...
February 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29452950/dynamic-fungal-cell-wall-architecture-in-stress-adaptation-and-immune-evasion
#8
REVIEW
Alex Hopke, Alistair J P Brown, Rebecca A Hall, Robert T Wheeler
Deadly infections from opportunistic fungi have risen in frequency, largely because of the at-risk immunocompromised population created by advances in modern medicine and the HIV/AIDS pandemic. This review focuses on dynamics of the fungal polysaccharide cell wall, which plays an outsized role in fungal pathogenesis and therapy because it acts as both an environmental barrier and as the major interface with the host immune system. Human fungal pathogens use architectural strategies to mask epitopes from the host and prevent immune surveillance, and recent work elucidates how biotic and abiotic stresses present during infection can either block or enhance masking...
February 13, 2018: Trends in Microbiology
https://www.readbyqxmd.com/read/29452928/comprehensive-on-line-two-dimensional-liquid-chromatography-%C3%A3-supercritical-fluid-chromatography-with-trapping-column-assisted-modulation-for-depolymerised-lignin-analysis
#9
Mingzhe Sun, Margareta Sandahl, Charlotta Turner
Lignin depolymerisation produces a large variety of low molecular weight phenolic compounds that can be upgraded to value-added chemicals. Detailed analysis of these complex depolymerisation mixtures is, however, hampered by the lack of resolving power of traditional analysis techniques. In this study, a novel online comprehensive two-dimensional reversed-phase liquid chromatography (RPLC) × supercritical fluid chromatography (SFC) method with trapping column interface was developed for the separation of phenolic compounds in depolymerised lignin samples...
February 6, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29452334/seed-2-a-user-friendly-platform-for-amplicon-high-throughput-sequencing-data-analyses
#10
Tomáš Vetrovský, Petr Baldrian, Daniel Morais, Bonnie Berger
Motivation: Modern molecular methods have increased our ability to describe microbial communities. Along with the advances brought by new sequencing technologies, we now require intensive computational resources to make sense of the large numbers of sequences continuously produced. The software developed by the scientific community to address this demand, although very useful, require experience of the command-line environment, extensive training and have steep learning curves, limiting their use...
February 14, 2018: Bioinformatics
https://www.readbyqxmd.com/read/29451892/assessing-site-formation-and-assemblage-integrity-through-stone-tool-refitting-at-gruta-da-oliveira-almonda-karst-system-torres-novas-portugal-a-middle-paleolithic-case-study
#11
Marianne Deschamps, João Zilhão
We use stone tool refitting to assess palimpsest formation and stratigraphic integrity in the basal units of the Gruta da Oliveira archeo-stratigraphic sequence, layers 15-27, which TL and U-series dating places in late Marine Isotope Stage (MIS) 5 or early MIS 4. As in most karst contexts, the formation of this succession involved multiple and complex phenomena, including subsidence, bioturbation, carnivore activity and runoff as agents of potential post-depositional disturbance. During phases of stabilization, such as represented by layers 15, 21 and 22, the excavated area was inhabited and refits corroborate that post-depositional displacement is negligible...
2018: PloS One
https://www.readbyqxmd.com/read/29450970/direct-imaging-of-space-charge-accumulation-and-work-function-characteristics-of-functional-organic-interfaces
#12
Pablo F Siles, Mirunalini Devarajulu, Feng Zhu, Oliver G Schmidt
The tailoring of organic systems is crucial to further extend the efficiency of charge transfer mechanisms and represents a cornerstone for molecular device technologies. However, this demands control of electrical properties and understanding of the physics behind organic interfaces. Here, a quantitative spatial overview of work function characteristics for phthalocyanine architectures on Au substrates is provided via kelvin probe microscopy. While macroscopic investigations are very informative, the current approach offers a nanoscale spatial rendering of electrical characteristics which is not possible to attain via conventional techniques...
February 16, 2018: Small
https://www.readbyqxmd.com/read/29449907/electrospun-conjugated-polymer-fullerene-hybrid-fibers-photoactive-blends-conductivity-through-tunneling-afm-light-scattering-and-perspective-for-their-use-in-bulk-heterojunction-organic-solar-cells
#13
Zhenhua Yang, Maria Moffa, Ying Liu, Hongfei Li, Luana Persano, Andrea Camposeo, Rosalba Saija, Maria Antonia Iatì, Onofrio M Maragò, Dario Pisignano, Chang-Yong Nam, Eyal Zussman, Miriam Rafailovich
Hybrid conjugated polymer/fullerene filaments based on MEH-PPV/PVP/PCBM were prepared by electrospinning, and their properties were assessed by scanning electron, atomic and lateral-force, tunneling, and confocal microscopies, as well as by attenuated-total-reflection Fourier transform infrared spectroscopy, photoluminescence quantum yield, and spatially resolved fluorescence. Highlighted features include the ribbon shape of the realized fibers and the persistence of a network serving as a template for heterogeneous active layers in solar cell devices...
February 8, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/29449843/insights-into-the-structural-basis-of-antibody-affinity-maturation-from-next-generation-sequencing
#14
REVIEW
Arjun K Mishra, Roy A Mariuzza
Affinity maturation is the process whereby the immune system generates antibodies of higher affinities during a response to antigen. It is unique in being the only evolutionary mechanism known to operate on a molecule in an organism's own body. Deciphering the structural mechanisms through which somatic mutations in antibody genes increase affinity is critical to understanding the evolution of immune repertoires. Next-generation sequencing (NGS) has allowed the reconstruction of antibody clonal lineages in response to viral pathogens, such as HIV-1, which was not possible in earlier studies of affinity maturation...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29449799/markov-switching-model-for-quick-detection-of-event-related-desynchronization-in-eeg
#15
Giuseppe Lisi, Diletta Rivela, Asuka Takai, Jun Morimoto
Quick detection of motor intentions is critical in order to minimize the time required to activate a neuroprosthesis. We propose a Markov Switching Model (MSM) to achieve quick detection of an event related desynchronization (ERD) elicited by motor imagery (MI) and recorded by electroencephalography (EEG). Conventional brain computer interfaces (BCI) rely on sliding window classifiers in order to perform online continuous classification of the rest vs. MI classes. Based on this approach, the detection of abrupt changes in the sensorimotor power suffers from an intrinsic delay caused by the necessity of computing an estimate of variance across several tenths of a second...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29449109/arsenic-containing-hydrocarbons-disrupt-a-model-in-vitro-blood-cerebrospinal-fluid-barrier
#16
S M Müller, F Ebert, J Bornhorst, H-J Galla, K A Francesconi, T Schwerdtle
Lipid-soluble arsenicals, so-called arsenolipids, have gained a lot of attention in the last few years because of their presence in many seafoods and reports showing substantial cytotoxicity emanating from arsenic-containing hydrocarbons (AsHCs), a prominent subgroup of the arsenolipids. More recent in vivo and in vitro studies indicate that some arsenolipids might have adverse effects on brain health. In the present study, we focused on the effects of selected arsenolipids and three representative metabolites on the blood-cerebrospinal fluid barrier (B-CSF-B), a brain-regulating interface...
February 6, 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29448393/localized-instabilities-and-spinodal-decomposition-in-driven-systems-in-the-presence-of-elasticity
#17
Esteban Meca, Andreas Münch, Barbara Wagner
We study numerically and analytically the instabilities associated with phase separation in a solid layer on which an external material flux is imposed. The first instability is localized within a boundary layer at the exposed free surface by a process akin to spinodal decomposition. In the limiting static case, when there is no material flux, the coherent spinodal decomposition is recovered. In the present problem, stability analysis of the time-dependent and nonuniform base states as well as numerical simulations of the full governing equations are used to establish the dependence of the wavelength and onset of the instability on parameter settings and its transient nature as the patterns eventually coarsen into a flat moving front...
January 2018: Physical Review. E
https://www.readbyqxmd.com/read/29448357/oscillating-decorated-interfaces-in-parametrically-driven-systems
#18
E Berrios-Caro, M G Clerc, M A Ferre, A O Leon
Macroscopic systems forced by the temporal modulation of their parameters exhibit complex interfaces between symmetric states. Here we investigate the origin of the transition from a flat to an oscillating decorated interface. Based on a model that describes a magnetic plane under the influence of an oscillating magnetic field and an extended Josephson junction under the influence of an alternating current, we derive a simple model that accounts for the interface dynamics. Analytically this model allows us to reveal that this transition is a parametric resonance between the frequencies of interface modes and the forcing...
January 2018: Physical Review. E
https://www.readbyqxmd.com/read/29448344/multiple-eigenmodes-of-the-rayleigh-taylor-instability-observed-for-a-fluid-interface-with-smoothly-varying-density
#19
C X Yu, C Xue, J Liu, X Y Hu, Y Y Liu, W H Ye, L F Wang, J F Wu, Z F Fan
In this article, multiple eigen-systems including linear growth rates and eigen-functions have been discovered for the Rayleigh-Taylor instability (RTI) by numerically solving the Sturm-Liouville eigen-value problem in the case of two-dimensional plane geometry. The system called the first mode has the maximal linear growth rate and is just extensively studied in literature. Higher modes have smaller eigen-values, but possess multi-peak eigen-functions which bring on multiple pairs of vortices in the vorticity field...
January 2018: Physical Review. E
https://www.readbyqxmd.com/read/29446495/the-role-of-cobra-like-2-function-as-part-of-the-complex-network-of-interacting-pathways-regulating-arabidopsis-seed-mucilage-polysaccharide-matrix-organization
#20
Daniela Ben-Tov, Anat Idan-Molakandov, Anat Hugger, Ilan Ben-Shlush, Markus Günl, Bo Yang, Björn Usadel, Smadar Harpaz-Saad
The production of hydrophilic mucilage along the course of seed coat epidermal cell differentiation is a common adaptation in angiosperms. Previous studies identified COBRA-LIKE 2 (COBL2), a member of the COBRA-LIKE gene family, as a novel component required for crystalline cellulose deposition in seed coat epidermal cells. In recent years, Arabidopsis seed coat epidermal cells (SCEs), also called mucilage secretory cells, have emerged as a powerful model system for the study of plant cell wall components biosynthesis, secretion, assembly and de-muro modification...
February 15, 2018: Plant Journal: for Cell and Molecular Biology
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