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https://www.readbyqxmd.com/read/28734899/strategies-to-develop-endogenous-stem-cell-recruiting-bioactive-materials-for-tissue-repair-and-regeneration
#1
Settimio Pacelli, Sayantani Basu, Jonathan Whitlow, Aparna R Chakravarti, Francisca Acosta, Arushi Varshney, Saman Modaresi, Cory Berkland, Arghya Paul
A leading strategy in tissue engineering is the design of biomimetic scaffolds that stimulate the body's repair mechanisms through the recruitment of endogenous stem cells to sites of injury. Approaches that employ the use of chemoattractant gradients to guide tissue regeneration without external cell sources are favored over traditional cell-based therapies that have limited potential for clinical translation. Following this concept, bioactive scaffolds can be engineered to provide a temporally and spatially controlled release of biological cues, with the possibility to mimic the complex signaling patterns of endogenous tissue regeneration...
July 19, 2017: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/28734266/air-quality-and-health-effects-of-biogenic-volatile-organic-compounds-emissions-from-urban-green-spaces-and-the-mitigation-strategies
#2
Yuan Ren, Zelong Qu, Yuanyuan Du, Ronghua Xu, Danping Ma, Guofu Yang, Yan Shi, Xing Fan, Akira Tani, Peipei Guo, Ying Ge, Jie Chang
Biogenic volatile organic compounds (BVOCs) emissions lead to fine particulate matter (PM2.5) and ground-level ozone pollution, and are harmful to human health, especially in urban areas. However, most BVOCs estimations ignored the emissions from urban green spaces, causing inaccuracies in the understanding of regional BVOCs emissions and their environmental and health effects. In this study, we used the latest local vegetation datasets from our field survey and applied an estimation model to analyze the spatial-temporal patterns, air quality impacts, health damage and mitigating strategies of BVOCs emissions in the Greater Beijing Area...
July 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28734144/expression-of-planar-cell-polarity-genes-during-mouse-tooth-development
#3
Nobuko Obara, Yuko Suzuki, Kazuharu Irie, Shunichi Shibata
OBJECTIVE: Planar cell polarity (PCP) refers to the cell polarity across the tissue plane and controls various cell behaviors and structures. Although the expression of several PCP signaling components has been detected in tooth germs, knowledge of the gene expression patterns of these PCP components during tooth development remains incomplete. The aim of this study is to characterize the temporal and spatial changes in PCP gene expression during tooth development. DESIGN: Expression of Celsr1 and 2, Fzd3 and 6, Vangl1 and 2, and Dvl1-3 genes was analyzed in mouse molar germs from the bud to the bell stage using in situ hybridization...
July 14, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28734110/when-can-refuges-mediate-the-genetic-effects-of-fire-regimes-a-simulation-study-of-the-effects-of-topography-and-weather-on-neutral-and-adaptive-genetic-diversity-in-fire-prone-landscapes
#4
Sam C Banks, Ian D Davies, Geoffrey J Cary
Understanding how landscape heterogeneity mediates the effects of fire on biodiversity is increasingly important under global changes in fire regimes. We used a simulation experiment to investigate how fire regimes interact with topography and weather to shape neutral and selection-driven genetic diversity under alternative dispersal scenarios, and to explore the conditions under which micro-refuges can maintain genetic diversity of populations exposed to recurrent fire. Spatial heterogeneity in simulated fire frequency occurred in topographically-complex landscapes, with fire refuges and fire-prone 'hotspots' apparent...
July 22, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28733835/competition-and-coexistence-in-a-small-carnivore-guild
#5
Jacques de Satgé, Kristine Teichman, Bogdan Cristescu
The potential for strong competition among small sympatric carnivores results in a need for coexistence strategies whereby competitors partition along spatial, temporal and dietary axes as a means to reduce ecological overlaps. We determined spatial and temporal partitioning patterns of a guild of small African carnivores: the African wildcat Felis silvestris lybica, grey mongoose Galerella pulverulenta, small-spotted genet Genetta genetta, striped polecat Ictonyx striatus, and the yellow mongoose Cynictis penicillata...
July 21, 2017: Oecologia
https://www.readbyqxmd.com/read/28733615/impact-of-natural-blind-spot-location-on-perimetry
#6
Mengyu Wang, Lucy Q Shen, Michael V Boland, Sarah R Wellik, Carlos Gustavo De Moraes, Jonathan S Myers, Peter J Bex, Tobias Elze
We study the spatial distribution of natural blind spot location (NBSL) and its impact on perimetry. Pattern deviation (PD) values of 11,449 reliable visual fields (VFs) that are defined as clinically unaffected based on summary indices were extracted from 11,449 glaucoma patients. We modeled NBSL distribution using a two-dimensional non-linear regression approach and correlated NBSL with spherical equivalent (SE). Additionally, we compared PD values of groups with longer and shorter distances than median, and larger and smaller angles than median between NBSL and fixation...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28733256/prefrontal-neuromodulation-reverses-spatial-associations-of-non-numerical-sequences-but-not-numbers
#7
Philipp Alexander Schroeder, Hans-Christoph Nuerk, Christian Plewnia
Numerical and non-numerical sequence items interact with spatial responding, pointing towards mental representations that are grounded in space and referred to as SNARC effects (spatial-numerical association of response codes). An ongoing controversy pertains to the universal origin of different SNARC effects and whether their underpinning is a spatial arrangement of cardinal magnitude (mental number line) or a sequential arrangement of ordinal elements in working memory. Recent results from prefrontal neuromodulation with transcranial direct current stimulation (tDCS) were supportive of the unified working memory account...
July 18, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28733246/defective-recognition-and-naming-of-famous-people-from-voice-in-patients-with-unilateral-temporal-lobe-tumours
#8
C Papagno, G Mattavelli, A Casarotti, L Bello, G Gainotti
Twenty-nine patients who underwent surgery for a temporal glioma, either in the left (16 patients) or right (13 patients) hemisphere, were administered standardized tests of unknown voice discrimination (UVD) and of famous voice recognition (VO-REC), which included tasks of familiarity evaluation, semantic identification and naming of famous voices. The UVD consisted of twenty stimuli, in which two audio files were consecutively presented; the subject was requested to judge whether the voices belonged to the same or different persons...
July 18, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28733163/rnai-mediated-knockdown-of-spook-reduces-ecdysteroid-titers-and-causes-precocious-metamorphosis-in-the-desert-locust-schistocerca-gregaria
#9
Ryohei Sugahara, Seiji Tanaka, Takahiro Shiotsuki
The Halloween gene SPOOK (SPO) is involved in the production of the active metabolite of ecdysteroid, 20-hydroxyecdysone (20E), in insects. A previous study showed that RNAi-mediated knockdown of SPO in Schistocerca gregaria last instar nymphs markedly reduced the hemolymph 20E titer, but did not affect metamorphosis. In the present study, the effects of SPO interference on development were re-examined in this locust. Injections of SPO double-stranded RNA (dsSPO) into nymphs at mid and late instars significantly delayed nymphal development and interfered with molting...
July 18, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28733072/early-myocardial-edema-after-acute-myocardial-infarction-is-stable-and-not-bimodal-in-humans-evidence-from-a-large-cmr-multicenter-study
#10
Thomas Stiermaier, Holger Thiele, Ingo Eitel
BACKGROUND: Experimental data reported a temporal pattern of myocardial edema following acute myocardial infarction (AMI). Therefore, the aim of this study was to assess the time course of myocardial edema in a large population of patients with ST-segment elevation myocardial infarction (STEMI). METHODS: Myocardium at risk (MAR), infarct size (IS) and myocardial salvage index (MSI) were compared according to the time between infarction and cardiovascular magnetic resonance (CMR) imaging in a large multicenter STEMI cohort (n=795)...
July 18, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28732342/scope-mtl-a-non-invasive-tool-for-identifying-and-lateralizing-mesial-temporal-lobe-seizures-prior-to-scalp-eeg-ictal-onset
#11
Alice D Lam, Douglas Maus, Sahar F Zafar, Andrew J Cole, Sydney S Cash
OBJECTIVE: In mesial temporal lobe (mTL) epilepsy, seizure onset can precede the appearance of a scalp EEG ictal pattern by many seconds. The ability to identify this early, occult mTL seizure activity could improve lateralization and localization of mTL seizures on scalp EEG. METHODS: Using scalp EEG spectral features and machine learning approaches on a dataset of combined scalp EEG and foramen ovale electrode recordings in patients with mTL epilepsy, we developed an algorithm, SCOPE-mTL, to detect and lateralize early, occult mTL seizure activity, prior to the appearance of a scalp EEG ictal pattern...
July 1, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28732273/using-computational-theory-to-constrain-statistical-models-of-neural-data
#12
REVIEW
Scott W Linderman, Samuel J Gershman
Computational neuroscience is, to first order, dominated by two approaches: the 'bottom-up' approach, which searches for statistical patterns in large-scale neural recordings, and the 'top-down' approach, which begins with a theory of computation and considers plausible neural implementations. While this division is not clear-cut, we argue that these approaches should be much more intimately linked. From a Bayesian perspective, computational theories provide constrained prior distributions on neural data-albeit highly sophisticated ones...
July 18, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28732269/gyral-net-a-new-representation-of-cortical-folding-organization
#13
Hanbo Chen, Yujie Li, Fangfei Ge, Gang Li, Dinggang Shen, Tianming Liu
One distinct feature of the cerebral cortex is its convex (gyri) and concave (sulci) folding patterns. Due to the remarkable complexity and variability of gyral/sulcal shapes, it has been challenging to quantitatively model their organization patterns. Inspired by the observation that the lines of gyral crests can form a connected graph on each brain hemisphere, we propose a new representation of cortical gyri/sulci organization pattern - gyral net, which models cortical architecture from a graph perspective, starting with nodes and edges obtained from the reconstructed cortical surfaces...
July 15, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28732260/differences-in-emotional-stimuli-processing-in-subjects-with-mtle-with-and-without-depression
#14
Lidija Preglej, Ksenija Marinković, Hrvoje Hećimović
In healthy people, a preference in attention maintenance and memory for words with emotional valence comparing to neutral words has been shown. The pattern of emotional stimuli processing may be different in people with mesial temporal lobe epilepsy (MTLE) and it may be sensitive to the presence of depressive symptoms. In order to explore these possibilities, we applied the emotional spatial cueing attentional task and the free recall memory task to participants (N=39) with MTLE and compared them with healthy controls...
July 18, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28732162/dynamical-design-of-spatial-patterns-of-colloidal-suspensions
#15
Nuno Am Araujo, Dmitry Zezyulin, Vladimir Konotop, Margarida M Telo da Gama
We study the collective dynamics of colloidal suspensions in the presence of a time-dependent potential, by means of dynamical density functional theory. We consider a non-linear diffusion equation for the density and show that spatial patterns emerge from a sinusoidal external potential with a time-dependent wavelength. These patterns are characterized by a sinusoidal density with the average wavelength and a Bessel-function envelope with an induced wavelength that depends only on the amplitude of the temporal oscillations...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28732007/a-data-driven-modeling-approach-to-identify-disease-specific-multi-organ-networks-driving-physiological-dysregulation
#16
Warren D Anderson, Danielle DeCicco, James S Schwaber, Rajanikanth Vadigepalli
Multiple physiological systems interact throughout the development of a complex disease. Knowledge of the dynamics and connectivity of interactions across physiological systems could facilitate the prevention or mitigation of organ damage underlying complex diseases, many of which are currently refractory to available therapeutics (e.g., hypertension). We studied the regulatory interactions operating within and across organs throughout disease development by integrating in vivo analysis of gene expression dynamics with a reverse engineering approach to infer data-driven dynamic network models of multi-organ gene regulatory influences...
July 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28731453/topological-alterations-and-symptom-relevant-modules-in-the-whole-brain-structural-network-in-semantic-dementia
#17
Junhua Ding, Keliang Chen, Weibin Zhang, Ming Li, Yan Chen, Qing Yang, Yingru Lv, Qihao Guo, Zaizhu Han
BACKGROUND: Semantic dementia (SD) is characterized by a selective decline in semantic processing. Although the neuropsychological pattern of this disease has been identified, its topological global alterations and symptom-relevant modules in the whole-brain anatomical network have not been fully elucidated. OBJECTIVE: This study aims to explore the topological alteration of anatomical network in SD and reveal the modules associated with semantic deficits in this disease...
July 19, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28731042/molecular-alterations-of-coexisting-thyroid-papillary-carcinoma-and-anaplastic-carcinoma-identification-of-tert-mutation-as-an-independent-risk-factor-for-transformation
#18
Naoki Oishi, Tetsuo Kondo, Aya Ebina, Yukiko Sato, Junko Akaishi, Rumi Hino, Noriko Yamamoto, Kunio Mochizuki, Tadao Nakazawa, Hiroshi Yokomichi, Koichi Ito, Yuichi Ishikawa, Ryohei Katoh
Thyroid papillary carcinoma is the most common endocrine neoplasm and generally carries a favorable prognosis. However, a small subset of papillary carcinomas transforms into anaplastic carcinoma, an undifferentiated cancer with a dismal prognosis. Recent studies using next-generation sequencing revealed the genomic landscape of papillary carcinoma and anaplastic carcinoma. However, risk factors for anaplastic transformation in papillary carcinoma remain obscure. In the present study, we investigated molecular alterations of papillary carcinoma and anaplastic carcinoma components in 27 tumors in which anaplastic carcinoma coexisted with antecedent papillary carcinoma...
July 21, 2017: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/28729850/drug-resistant-epilepsy-multiple-hypotheses-few-answers
#19
REVIEW
Fei Tang, Anika M S Hartz, Björn Bauer
Epilepsy is a common neurological disorder that affects over 70 million people worldwide. Despite the recent introduction of new antiseizure drugs (ASDs), about one-third of patients with epilepsy have seizures refractory to pharmacotherapy. Early identification of patients who will become refractory to ASDs could help direct such patients to appropriate non-pharmacological treatment, but the complexity in the temporal patterns of epilepsy could make such identification difficult. The target hypothesis and transporter hypothesis are the most cited theories trying to explain refractory epilepsy, but neither theory alone fully explains the neurobiological basis of pharmacoresistance...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28729738/human-hippocampal-pre-activation-predicts-behavior
#20
Anna Jafarpour, Vitoria Piai, Jack J Lin, Robert T Knight
The response to an upcoming salient event is accelerated when the event is expected given the preceding events - i.e. a temporal context effect. For example, naming a picture following a strongly constraining temporal context is faster than naming a picture after a weakly constraining temporal context. We used sentences as naturalistic stimuli to manipulate expectations on upcoming pictures without prior training. Here, using intracranial recordings from the human hippocampus we found more power in the high-frequency band prior to high-expected pictures than weakly expected ones...
July 20, 2017: Scientific Reports
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