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https://www.readbyqxmd.com/read/29783181/autistic-traits-in-epilepsy-models-why-when-and-how
#1
REVIEW
Jana Velíšková, Jill L Silverman, Melissa Benson, Pierre-Pascal Lenck-Santini
Autism spectrum disorder (ASD) is a common comorbidity of epilepsy and seizures and/or epileptiform activity are observed in a significant proportion of ASD patients. Current research also implies that autistic traits can be observed to a various degree in mice and rats with seizures. This suggests that there are shared mechanisms in both ASD and epilepsy syndromes. Here, we first review the standard, validated methods used to assess autistic traits in animal models as well as their limitations with regards to epilepsy models...
May 18, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29783142/assessment-of-microbial-products-in-the-biosorption-process-of-cu-ii-onto-aerobic-granular-sludge-extracellular-polymeric-substances-contribution-and-soluble-microbial-products-release
#2
Linxian Huang, Meilin Li, Guangchao Si, Jinglin Wei, Huu Hao Ngo, Wenshan Guo, Weiying Xu, Bin Du, Qin Wei, Dong Wei
In the present study, the responses of microbial products in the biosorption process of Cu(II) onto aerobic granular sludge were evaluated by using batch and spectroscopic approaches. Batch experimental data showed that extracellular polymeric substances (EPSs) contributed to Cu(II) removal from an aqueous solution, especially when treating low metal concentrations, whereas soluble microbial products (SMPs) were released under the metal stress during biosorption process. A three-dimensional excitation-emission matrix (3D-EEM) identified four main fluorescence peaks in the EPS, i...
May 18, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29783139/inspection-of-baked-carbon-anodes-using-a-combination-of-multi-spectral-acousto-ultrasonic-techniques-and-principal-component-analysis
#3
Moez Ben Boubaker, Donald Picard, Carl Duchesne, Jayson Tessier, Houshang Alamdari, Mario Fafard
This paper reports on the application of an acousto-ultrasonic (AU) scheme for the inspection of industrial-size carbon anode blocks used in the production of primary aluminium by the Hall-Héroult process. A frequency-modulated wave is used to excite the anode blocks at multiple points. The collected attenuated AU signals are decomposed using the Discrete Wavelet Transform (DTW) after which vectors of features are calculated. Principal Component Analysis (PCA) is utilized to cluster the AU responses of the anodes...
May 17, 2018: Ultrasonics
https://www.readbyqxmd.com/read/29783105/sterol-gradients-in-cells
#4
REVIEW
Anant K Menon
Cell organelles and the plasma membrane have unique lipid compositions. Consequently, there is a gradient of lipid-dependent properties along the secretory pathway. We focus here on the steep sterol gradients that exist between the endoplasmic reticulum and plasma membrane, as well as across the plasma membrane where sterols are found principally in the cytoplasmic leaflet. Recent progress in these areas has been remarkable, with new concepts and molecules to account for non-vesicular intracellular sterol transport, and an exciting new mechanism to explain the unexpected transbilayer distribution of sterols...
May 18, 2018: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/29783061/enhanced-extinction-of-aversive-memories-in-mice-lacking-sparc-related-protein-containing-immunoglobulin-domains-1-spig1-fstl4
#5
Ryoko Suzuki, Akihiro Fujikawa, Yukio Komatsu, Kazuya Kuboyama, Naomi Tanga, Masaharu Noda
Brain-derived neurotrophic factor (BDNF) plays an important role in synaptic plasticity related to learning and memory. We previously reported that SPARC-related protein-containing immunoglobulin domains 1 (SPIG1, also known as Follistatin-like protein 4, FSTL4) binds to pro-BDNF and negatively regulates BDNF maturation; however, its neurological functions, particularly in learning and memory, have not yet been elucidated. We herein examined the electrophysiological and behavioral phenotypes of Spig1-knockout (Spig1-KO) mice...
May 18, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29782957/the-role-of-monoamines-in-the-development-of-alzheimer-s-disease-and-neuroprotective-effect-of-a-proline-rich-polypeptide
#6
Konstantin Yenkoyan, Katarine Fereshetyan, Senik Matinyan, Vergine Chavushyan, Michail Aghajanov
INTRODUCTION: We have analyzed the alterations in the brain monoaminergic system using the rat model of AD-like pathology. In addition, we have investigated potential neuroprotective effects of the hypothalamic proline-rich polypeptide (PRP-1). METHODS: Histochemical staining, HPLC, chemiluminescent and bioluminescence assays. RESULTS: The levels of monoamines in the target AD brain structures were found elevated, except serotonin, which was unaffected in both hippocampus and brainstem and decreased in frontal cortex...
May 18, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29782955/loss-of-calretinin-and-parvalbumin-positive-interneurones-in-the-hippocampal-ca1-of-aged-alzheimer-s-disease-mice
#7
Fatima Zallo, Emanuela Gardenal, Alexei Verkhratsky, José Julio Rodríguez
Neuronal degeneration associated with Alzheimer's disease (AD), is linked to impaired calcium homeostasis and to changes in calcium-binding proteins (CBPs). The AD-related modification of neuronal CBPs remains controversial. Here we analyzed the presence and expression of calretinin (CR) and parvalbumin (PV) in the hippocampal CA1 neurones of 18 months old 3xTg-AD mice compared to non-Tg animals. We found a layer specific decrease in number of interneurones expressing CR and PV (by 33.7% and 52%, respectively)...
May 18, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29782876/chloride-cotransporter-kcc2-is-essential-for-gabaergic-inhibition-in-the-scn
#8
A H O Olde Engberink, J H Meijer, S Michel
One of the principal neurotransmitters of the central nervous system is GABA. In the adult brain, GABA is predominantly inhibitory, but there is growing evidence indicating that GABA can shift to excitatory action depending on environmental conditions. In the mammalian central circadian clock of the suprachiasmatic nucleus (SCN) GABAergic activity shifts from inhibition to excitation when animals are exposed to long day photoperiod. The polarity of the GABAergic response (inhibitory versus excitatory) depends on the GABA equilibrium potential determined by the intracellular Cl- concentration ([Cl- ]i )...
May 18, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29782847/optogenetic-induction-of-colonic-motility-in-mice
#9
Timothy J Hibberd, Jing Feng, Jialie Luo, Pu Yang, Vijay K Samineni, Robert W Gereau, Nigel Kelley, Hongzhen Hu, Nick J Spencer
BACKGROUND & AIMS: Strategies are needed to increase gastrointestinal transit without systemic pharmacologic agents. We investigated whether optogenetics, focal application of light to control enteric nervous system excitability, could be used to evoke propagating contractions and increase colonic transit in mice. METHODS: We generated transgenic mice with Cre-mediated expression of light-sensitive channelrhodopsin-2 (CHR2) in calretinin neurons (CAL-ChR2 Cre+ mice); Cre- littermates served as controls...
May 18, 2018: Gastroenterology
https://www.readbyqxmd.com/read/29782834/high-throughput-dissection-of-aav-host-interactions-the-fast-and-the-curious
#10
REVIEW
Anne-Kathrin Herrmann, Dirk Grimm
Over fifty years after its initial description, Adeno-associated virus (AAV) remains a most exciting but also most elusive study object in basic or applied virology. On the one hand, its simple structure not only facilitates investigations into virus biology, but combined with the availability of numerous natural AAV variants with distinct infection efficiency and specificity also makes AAV a preferred substrate for engineering of gene delivery vectors. On the other hand, it is striking to witness a recent flurry of reports that highlight and partially close persistent gaps in our understanding of AAV virus and vector biology...
May 18, 2018: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29782705/wild-gwas-association-mapping-in-natural-populations
#11
Anna W Santure, Dany Garant
The increasing affordability of sequencing and genotyping technologies has transformed the field of molecular ecology in recent decades. By correlating marker variants with trait variation using association analysis, large-scale genotyping and phenotyping of individuals from wild populations has enabled the identification of genomic regions that contribute to phenotypic differences among individuals. Such 'gene mapping' studies are enabling us to better predict evolutionary potential and the ability of populations to adapt to challenges, such as changing environment...
May 21, 2018: Molecular Ecology Resources
https://www.readbyqxmd.com/read/29782679/mos-2-negative-capacitance-field-effect-transistors-with-subthreshold-swing-below-the-physics-limit
#12
Xingqiang Liu, Renrong Liang, Guoyun Gao, Caofeng Pan, Chunsheng Jiang, Qian Xu, Jun Luo, Xuming Zou, Zhenyu Yang, Lei Liao, Zhong Lin Wang
The Boltzmann distribution of electrons induced fundamental barrier prevents subthreshold swing (SS) from less than 60 mV dec-1 at room temperature, leading to high energy consumption of MOSFETs. Herein, it is demonstrated that an aggressive introduction of the negative capacitance (NC) effect of ferroelectrics can decisively break the fundamental limit governed by the "Boltzmann tyranny". Such MoS2 negative-capacitance field-effect transistors (NC-FETs) with self-aligned top-gated geometry demonstrated here pull down the SS value to 42...
May 21, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29782671/enhanced-performance-of-a-molecular-photoacoustic-imaging-agent-by-encapsulation-in-mesoporous-silicon-nanoparticles
#13
Jinyoung Kang, Dokyoung Kim, Junxin Wang, Yunho Han, Jonathan M Zuidema, Ali Hariri, Ji-Ho Park, Jesse V Jokerst, Michael J Sailor
Photoacoustic (PA) imaging allows visualization of the physiology and pathology of tissues with good spatial resolution and relatively deep tissue penetration. The method converts near-infrared (NIR) laser excitation into thermal expansion, generating pressure transients that are detected with an acoustic transducer. Here, we find that the response of the PA contrast agent indocyanine green (ICG) can be enhanced 17-fold when it is sealed within a rigid nanoparticle. ICG encapsulated in particles composed of porous silicon (pSiNP), porous silica, or calcium silicate all show greater PA contrast relative to equivalent quantities of free ICG, with the pSiNPs showing the strongest enhancement...
May 21, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29782652/adenosine-methylation-as-a-molecular-imprint-defining-the-fate-of-rna
#14
REVIEW
Philip Knuckles, Marc Bühler
Multiple lines of evidence suggest the RNA modification N6 -methyladonsine (m6 A), which is installed in the nucleus co-transcriptionally and, thereafter, serves as a reversible chemical imprint that influences several steps of mRNA metabolism. This includes but is not limited to RNA folding, splicing, stability, transport, and translation. In this Review we focus on the current view of the nuclear installation of m6 A as well the molecular players involved, the so called m6 A writers. We also explore the effector proteins, or m6 A readers, that decode the imprint in different cellular contexts and compartments, and ultimately, the way the modification influences the lifecycle of an RNA molecule...
May 21, 2018: FEBS Letters
https://www.readbyqxmd.com/read/29782510/individual-differences-in-learning-correlate-with-modulation-of-brain-activity-induced-by-transcranial-direct-current-stimulation
#15
Brian Falcone, Atsushi Wada, Raja Parasuraman, Daniel E Callan
Transcranial direct current stimulation (tDCS) has been shown to enhance cognitive performance on a variety of tasks. It is hypothesized that tDCS enhances performance by affecting task related cortical excitability changes in networks underlying or connected to the site of stimulation facilitating long term potentiation. However, many recent studies have called into question the reliability and efficacy of tDCS to induce modulatory changes in brain activity. In this study, our goal is to investigate the individual differences in tDCS induced modulatory effects on brain activity related to the degree of enhancement in performance, providing insight into this lack of reliability...
2018: PloS One
https://www.readbyqxmd.com/read/29782497/exploration-of-alternative-test-methods-to-evaluate-phototoxicity-of-ophthalmic-agents-by-using-statens-seruminstitut-rabbit-cornea-cell-lines-and-3d-human-reconstituted-cornea-models
#16
Soyoung Kim, Ki Hwan Choi, Jaesuk Yun
Many chemicals have been reported to induce phototoxicity. The absorbance of light energy within the sunlight range is a common characteristic of phototoxicity. The 3T3 NRU phototoxicity test (PT) in 3T3 mouse skin fibroblasts has been used to identify the phototoxic potential induced by excited chemicals after exposure to ultra violet (UV). However, as phototoxicity may occur in ocular cells, it is necessary to develop a more suitable test for cornea-derived cells. In this study, we attempted to establish a new in vitro PT method in rabbit corneal cell lines (SIRC)...
2018: PloS One
https://www.readbyqxmd.com/read/29782304/role-of-in-vivo-reflectance-confocal-microscopy-in-the-analysis-of-melanocytic-lesions
#17
Elena-Daniela Serban, Francesca Farnetani, Giovanni Pellacani, Maria Magdalena Constantin
Worldwide melanoma incidence and mortality are increasing (1). Despite the ongoing research, advanced melanoma is still incurable; therefore, the most appropriate solution seems to be early detection combined with complete surgical excision (2). Since the diagnostic protocol of suspicious lesions includes a complete excision with safety margins (2), the problem of unnecessary scarring is significant. The real challenge in this case is to have a properly formulated diagnosis before acquiring a biopsy. Currently available non-invasive techniques are coherence tomography, digital dermoscopy, and reflectance confocal microscopy...
April 2018: Acta Dermatovenerologica Croatica: ADC
https://www.readbyqxmd.com/read/29782171/bias-dependent-chemical-enhancement-and-non-classical-stark-effect-in-tip-enhanced-raman-spectromicroscopy-of-co-terminated-ag-tips
#18
Rebecca L M Gieseking, Joonhee Lee, Nicholas Tallarida, Vartkess Ara Apkarian, George C Schatz
Tip-enhanced Raman spectromicroscopy (TERS) with CO-terminated plasmonic tips can probe Ångstrom-scale features of molecules on surfaces. The development of this technique requires understanding of how chemical environments affect the CO vibrational frequency and TERS intensity. At the scanning tunneling microscope junction of a CO-terminated Ag tip, we show that rather than the classical vibrational Stark effect, the large bias dependence of the CO frequency shift is due to ground-state charge transfer from the Ag tip into the CO π* orbital softening the C-O bond at more positive biases...
May 21, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29782165/linked-cluster-formulation-of-electron-hole-interaction-kernel-in-real-space-representation-without-using-unoccupied-states
#19
Michael G Bayne, Jeremy A Scher, Benjamin H Ellis, Arindam Chakraborty
Electron-hole or quasiparticle representation plays a central role in describing electronic excitations in many-electron systems. For charge-neutral excitation, the electron-hole interaction kernel is the quantity of interest for calculating important excitation properties such as optical gap, optical spectra, electron-hole recombination and electron-hole binding energies. The electron-hole interaction kernel can be formally derived from the density-density correlation function using both Green's function and TDDFT formalism...
May 21, 2018: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29782051/the-novel-sodium-channel-modulator-gs-458967-gs967-is-an-effective-treatment-in-a-mouse-model-of-scn8a-encephalopathy
#20
Erin M Baker, Christopher H Thompson, Nicole A Hawkins, Jacy L Wagnon, Eric R Wengert, Manoj K Patel, Alfred L George, Miriam H Meisler, Jennifer A Kearney
OBJECTIVE: De novo mutations of SCN8A, encoding the voltage-gated sodium channel NaV 1.6, have been associated with a severe infant onset epileptic encephalopathy. Individuals with SCN8A encephalopathy have a mean age of seizure onset of 4-5 months, with multiple seizure types that are often refractory to treatment with available drugs. Anecdotal reports suggest that high-dose phenytoin is effective for some patients, but there are associated adverse effects and potential for toxicity...
May 21, 2018: Epilepsia
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