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https://www.readbyqxmd.com/read/28431249/macrophages-facilitate-electrical-conduction-in-the-heart
#1
Maarten Hulsmans, Sebastian Clauss, Ling Xiao, Aaron D Aguirre, Kevin R King, Alan Hanley, William J Hucker, Eike M Wülfers, Gunnar Seemann, Gabriel Courties, Yoshiko Iwamoto, Yuan Sun, Andrej J Savol, Hendrik B Sager, Kory J Lavine, Gregory A Fishbein, Diane E Capen, Nicolas Da Silva, Lucile Miquerol, Hiroko Wakimoto, Christine E Seidman, Jonathan G Seidman, Ruslan I Sadreyev, Kamila Naxerova, Richard N Mitchell, Dennis Brown, Peter Libby, Ralph Weissleder, Filip K Swirski, Peter Kohl, Claudio Vinegoni, David J Milan, Patrick T Ellinor, Matthias Nahrendorf
Organ-specific functions of tissue-resident macrophages in the steady-state heart are unknown. Here, we show that cardiac macrophages facilitate electrical conduction through the distal atrioventricular node, where conducting cells densely intersperse with elongated macrophages expressing connexin 43. When coupled to spontaneously beating cardiomyocytes via connexin-43-containing gap junctions, cardiac macrophages have a negative resting membrane potential and depolarize in synchrony with cardiomyocytes. Conversely, macrophages render the resting membrane potential of cardiomyocytes more positive and, according to computational modeling, accelerate their repolarization...
April 20, 2017: Cell
https://www.readbyqxmd.com/read/28431206/phase-transfer-ligand-exchange-of-lead-chalcogenide-quantum-dots-for-direct-deposition-of-thick-highly-conductive-films
#2
Qianglu Lin, Hyeong Jin Yun, Wenyong Liu, Hyung-Jun Song, Nikolay S Makarov, Oleksandr Isaienko, Tom Nakotte, Gen Chen, Hongmei Luo, Victor I Klimov, Jeffrey M Pietryga
The use of semiconductor nanocrystal quantum dots (QDs) in optoelectronic devices typically requires post-synthetic chemical surface treatments to enhance electronic coupling between QDs and allow for efficient charge transport in QD films. Despite their importance to solar cells, and infrared (IR) light-emitting diodes and photodetectors, advances in these chemical treatments for lead chalcogenide (PbE, E = S, Se, Te) QDs have lagged behind those of, for instance, II-VI semiconductor QDs. Here, we introduce a method for fast and effective ligand exchange for PbE QDs in solution, resulting in QDs completely passivated by a wide range of small anionic ligands...
April 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28430876/ift25-an-intraflagellar-transporter-protein-dispensable-for-ciliogenesis-in-somatic-cells-is-essential-for-sperm-flagella-formation
#3
Hong Liu, Wei Li, Yong Zhang, Zhengang Zhang, Xuejun Shang, Ling Zhang, Shiyang Zhang, Yanwei Li, Andres V Somoza, Brandon Delpi, George L Gerton, James A Foster, Rex A Hess, Gregory J Pazour, Zhibing Zhang
Intraflagellar transport (IFT) is a conserved mechanism essential for the assembly and maintenance of most eukaryotic cilia and flagella. However, IFT25, a component of the IFT complex is not required for the formation of cilia in somatic tissues. In mice, the gene is highly expressed in the testis, and its expression is up-regulated during the final phase when sperm flagella are formed. To investigate the role of IFT25 in sperm flagella formation, the gene was specifically disrupted in male germ cells. All homozygous knockout mice survived to adulthood and did not show any gross abnormalities...
April 18, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28430819/estimating-optimal-sparseness-of-developmental-gene-networks-using-a-semi-quantitative-model
#4
Natsuhiro Ichinose, Tetsushi Yada, Hiroshi Wada
To estimate gene regulatory networks, it is important that we know the number of connections, or sparseness of the networks. It can be expected that the robustness to perturbations is one of the factors determining the sparseness. We reconstruct a semi-quantitative model of gene networks from gene expression data in embryonic development and detect the optimal sparseness against perturbations. The dense networks are robust to connection-removal perturbation, whereas the sparse networks are robust to misexpression perturbation...
2017: PloS One
https://www.readbyqxmd.com/read/28429594/ruthenium-ii-catalyzed-ortho-c-h-chalcogenation-of-benzoic-acids-via-weak-o-coordination-synthesis-of-chalcogenoxanthones
#5
Anup Mandal, Suman Dana, Harekrishna Sahoo, Gowri Sankar Grandhi, Mahiuddin Baidya
A general protocol for direct chalcogenation of inert C-H bonds of (hetero)aromatic carboxylic acids is developed with a ruthenium(II) catalyst using readily available starting materials, offering densely substituted ortho-chalcogenyl aromatic acids in high yields (up to 96%). The strategy avoids the installation of an external directing group, use of metallic oxidants, and features operational simplicity with ample substrate scope. Synthetic application en route to biologically important chalcogenoxanthones is also demonstrated...
April 21, 2017: Organic Letters
https://www.readbyqxmd.com/read/28429572/finding-chemical-structures-corresponding-to-a-set-of-coordinates-in-chemical-descriptor-space
#6
Tomoyuki Miyao, Kimito Funatsu
When chemical structures are searched based on descriptor values, or descriptors are interpreted based on values, it is important that corresponding chemical structures actually exist. In order to consider the existence of chemical structures located in a specific region in the chemical space, we propose to search them inside training data domains (TDDs), which are dense areas of a training dataset in the chemical space. We investigated TDDs' features using diverse and local datasets, assuming that GDB11 is the chemical universe...
April 21, 2017: Molecular Informatics
https://www.readbyqxmd.com/read/28428693/the-association-between-small-dense-low-density-lipoprotein-and-coronary-artery-disease-in-north-indian-patients
#7
Pravin K Goel, Fauzia Ashfaq, Roopali Khanna, V Ramesh, Chandra Mohan Pandey
Pathogenesis of coronary artery disease (CAD) is multi-factorial and several conventional risk factors have been ascribed; LDL-C being one of the important risk factor. However Indian population studies with established CAD often show LDL levels within normal range in patients with proven CAD. We hypothesized that Small dense low density lipoprotein (sdLDL) being more atherogenic might correlate more strongly to the occurrence and severity of CAD. The aim of the study was to evaluate the association between serum small dense LDL level and angiographically documented coronary artery disease...
June 2017: Indian Journal of Clinical Biochemistry: IJCB
https://www.readbyqxmd.com/read/28428554/network-assisted-analysis-of-gwas-data-identifies-a-functionally-relevant-gene-module-for-childhood-onset-asthma
#8
Y Liu, M Brossard, C Sarnowski, A Vaysse, M Moffatt, P Margaritte-Jeannin, F Llinares-López, M H Dizier, M Lathrop, W Cookson, E Bouzigon, F Demenais
The number of genetic factors associated with asthma remains limited. To identify new genes with an undetected individual effect but collectively influencing asthma risk, we conducted a network-assisted analysis that integrates outcomes of genome-wide association studies (GWAS) and protein-protein interaction networks. We used two GWAS datasets, each consisting of the results of a meta-analysis of nine childhood-onset asthma GWASs (5,924 and 6,043 subjects, respectively). We developed a novel method to compute gene-level P-values (fastCGP), and proposed a parallel dense-module search and cross-selection strategy to identify an asthma-associated gene module...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28428079/mineralization-inhibiting-effects-of-transglutaminase-crosslinked-polymeric-osteopontin
#9
Betty Hoac, Valentin Nelea, Wenge Jiang, Mari T Kaartinen, Marc D McKee
Osteopontin (OPN) belongs to the SIBLING family (Small, Integrin-Binding LIgand N-linked Glycoproteins) of mineral-binding matrix proteins found in bones and teeth. OPN is a well-known inhibitor of matrix mineralization, and enzymatic modification of OPN can affect this inhibitory function. In bone, OPN exists both as a monomer and as a high-molecular-weight polymer - the latter is formed by transglutaminase-mediated crosslinking of glutamine and lysine residues in OPN to create homotypic protein assemblies...
April 17, 2017: Bone
https://www.readbyqxmd.com/read/28427989/egocentric-and-allocentric-visuospatial-working-memory-in-premotor-huntington-s-disease-a-double-dissociation-with-caudate-and-hippocampal-volumes
#10
Katherine L Possin, Hosung Kim, Michael D Geschwind, Tacie Moskowitz, Erica T Johnson, Sharon J Sha, Alexandra Apple, Duan Xu, Bruce L Miller, Steven Finkbeiner, Christopher P Hess, Joel H Kramer
Our brains represent spatial information in egocentric (self-based) or allocentric (landmark-based) coordinates. Rodent studies have demonstrated a critical role for the caudate in egocentric navigation and the hippocampus in allocentric navigation. We administered tests of egocentric and allocentric working memory to individuals with premotor Huntington's disease (pmHD), which is associated with early caudate nucleus atrophy, and controls. Each test had 80 trials during which subjects were asked to remember 2 locations over 1-sec delays...
April 17, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28427964/scanning-electron-microscopic-studies-on-antenna-of-hemipyrellia-ligurriens-wiedemann-1830-diptera-calliphoridae-a-blow-fly-species-of-forensic-importance
#11
Garima Hore, Aniruddha Maity, Atanu Naskar, Waliza Ansar, Shyamasree Ghosh, Goutam Kumar Saha, Dhriti Banerjee
Blow flies (Diptera: Calliphoridae) are one of the foremost organisms amongst forensic insects to colonize corpses shortly after death, thus are of immense importance in the domain of forensic entomology. The blow fly Hemipyrellia ligurriens (Wiedemann, 1830) (Diptera: Calliphoridae) is considered as a forensically important fly species globally and is also known for its medical and veterinary importance. In the present study, we report for the first time scanning electron microscopic studies on the morphology of sensilla of antenna of adult male and female of H...
April 17, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28427878/localized-degradation-of-foreign-dna-strands-in-cells-only-excising-the-first-nucleotide-of-5-region
#12
Hui Li, Wei Shen, Michael Hon-Wah Lam, Haojun Liang
Intracellular delivery of foreign DNA probes sharply increases the efficiency of various biodetection protocols. Spherical nucleic acid (SNA) conjugate is a new type of probe that consists of a dense oligonucleotide shell attached typically to a gold nanoparticle core. They are widely used as novel labels for in vitro biodetection and intracellular assay. However, the degradation of foreign DNA still remains a challenge that can cause significant signal leakage (false positive signal). Hence, the site and behavior of intracellular degradation need to be investigated...
April 17, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28426989/the-thermal-impact-of-subsurface-building-structures-on-urban-groundwater-resources-a-paradigmatic-example
#13
Jannis Epting, Stefan Scheidler, Annette Affolter, Paul Borer, Matthias H Mueller, Lukas Egli, Alejandro García-Gil, Peter Huggenberger
Shallow subsurface thermal regimes in urban areas are increasingly impacted by anthropogenic activities, which include infrastructure development like underground traffic lines as well as industrial and residential subsurface buildings. In combination with the progressive use of shallow geothermal energy systems, this results in the so-called subsurface urban heat island effect. This article emphasizes the importance of considering the thermal impact of subsurface structures, which commonly is underestimated due to missing information and of reliable subsurface temperature data...
April 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28426445/small-dense-ldl-an-update
#14
Philipp A Gerber, Dragana Nikolic, Manfredi Rizzo
PURPOSE OF REVIEW: In this review, we summarize the latest findings on small, dense LDL (sdLDL) atherogenic particles, including their associations with other biomarkers. RECENT FINDINGS: Increased sdLDL levels have been reported not only in different metabolic disorders such as diabetes, obesity and metabolic syndrome, but also in patients with rheumatoid and psoriatic arthritis as well as hypothyroidism. A wide range of lipid-lowering, as well as other drug classes, including novel antidiabetic agents and nutraceuticals, exert favourable effects on these atherogenic particles...
April 19, 2017: Current Opinion in Cardiology
https://www.readbyqxmd.com/read/28426209/channel-assisted-proton-conduction-behavior-in-hydroxyl-rich-lanthanide-based-magnetic-metal-organic-frameworks
#15
Soumava Biswas, Jayita Chakraborty, Vijay Singh Parmar, Siba Prasad Bera, Nirmal Ganguli, Sanjit Konar
Two new lanthanide-based 3D metal-organic frameworks (MOFs), {[Ln(L)(Ox)(H2O)]n·xH2O} [Ln = Gd(3+) and x = 3 (1) and Dy(3+) and x = 1.5 (2); H2L = mucic acid; OxH2 = oxalic acid] showing interesting magnetic properties and channel-mediated proton conduction behavior, are presented here. Single-crystal X-ray structure analysis shows that, in complex 1, the overall structure originates from the mucate-bridged gadolinium-based rectangular metallocycles. The packing view reveals the presence the two types of hydrophilic 1D channels filled with lattice water molecules, which are strongly hydrogen-bonded with coordinated water along the a and b axes, whereas for complex 2, the 3D framework originates from a carboxylate-bridged dysprosium-based criss-cross-type secondary building block...
April 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28426190/robust-polymer-electrolyte-membranes-with-high-ambient-temperature-lithium-ion-conductivity-via-polymerization-induced-microphase-separation
#16
Sujay A Chopade, Jesus G Au, Ziang Li, Peter W Schmidt, Marc A Hillmyer, Timothy P Lodge
Mechanically robust polymer electrolyte membranes (PEMs) exhibiting high ionic conductivity at ambient temperature are a prerequisite for next-generation electrochemical devices. We utilized a polymerization-induced microphase separation (PIMS) strategy to prepare nanostructured materials comprising continuous conducting nanochannels intertwined with a mechanically and thermally robust cross-linked polymeric framework. Addition of succinonitrile (SN) rendered the poly(ethylene oxide)/lithium (Li) salt conducting domains completely amorphous, resulting in outstanding conductivities (∼0...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28425184/enantioselective-synthesis-of-mitomycin%C3%A2-k-by-a-palladium-catalyzed-oxidative-tandem-cyclization
#17
Qiang-Shuai Gu, Dan Yang
The mitomycins, a family of bioactive natural products, feature a compact 6/5/5-fused polycyclic ring structure densely decorated with highly reactive and/or fragile quinone, amino ketal, and aziridine as well as carbamate moieties. It is this striking feature that has defeated numerous synthetic attempts towards these apparently small molecules, rendering them one of the most formidable targets for total synthesis. We herein report the first enantioselective synthesis of (+)-mitomycin K, a representative of G series mitomycins...
April 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28424946/preparation-and-corrosion-resistance-of-magnesium-phytic-acid-hydroxyapatite-composite-coatings-on-biodegradable-az31-magnesium-alloy
#18
Min Zhang, Shu Cai, Feiyang Zhang, Guohua Xu, Fengwu Wang, Nian Yu, Xiaodong Wu
In this work, a magnesium phytic acid/hydroxyapatite composite coating was successfully prepared on AZ31 magnesium alloy substrate by chemical conversion deposition technology with the aim of improving its corrosion resistance and bioactivity. The influence of hydroxyapatite (HA) content on the microstructure and corrosion resistance of the coatings was investigated. The results showed that with the increase of HA content in phytic acid solution, the cracks on the surface of the coatings gradually reduced, which subsequently improved the corrosion resistance of these coated magnesium alloy...
June 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28424618/pharmacological-and-biochemical-characterization-of-tlqp-21-activation-of-a-binding-site-on-cho-cells
#19
Laura Molteni, Laura Rizzi, Elena Bresciani, Roberta Possenti, Pamela Petrocchi Passeri, Corrado Ghè, Giampiero Muccioli, Jean-Alain Fehrentz, Pascal Verdié, Jean Martinez, Robert J Omeljaniuk, Giuseppe Biagini, Anna Binda, Ilaria Rivolta, Vittorio Locatelli, Antonio Torsello
VGF is a propeptide of 617 amino acids expressed throughout the central and the peripheral nervous system. VGF and peptides derived from its processing have been found in dense core vesicles and are released from neuronal and neuroendocrine cells via the regulated secretory pathway. Among VGF-derived neuropeptides, TLQP-21 (VGF(556-576)) has raised a huge interest and is one of most studied. TLQP-21 is a multifunctional neuropeptide involved in the control of several physiological functions, potentially including energy homeostasis, pain modulation, stress responsiveness and reproduction...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28424397/-spatial-cognition-and-episodic-memory-formation-in-the-limbic-cortex
#20
Yasushi Kobayashi
The limbic lobe defined by Broca is a cortical region with highly diverse structure and functions, and comprises the paleo-, archi-, and neocortices as well as their transitional zones. In the limbic lobe, Brodmann designated areas 27, 28, 34, 35, and 36 adjacent to the hippocampus, and areas 23, 24, 25, 26, 29, 30, 31, 32, and 33 around the corpus callosum. In the current literature, areas 27 and 28 correspond to the presubiculum and entorhinal cortex, respectively. Area 34 represents the cortico-medial part of the amygdaloid complex...
April 2017: Brain and Nerve, Shinkei Kenkyū No Shinpo
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