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https://www.readbyqxmd.com/read/28727659/patient-release-criteria-following-radioactive-iodine-131-treatment-in-the-light-of-international-practice-where-does-south-africa-fit-in
#1
Modisenyane S Mongane, William I D Rae
The release from hospital of patients treated with radioactive iodine-131 (I) remains a controversial issue as a result of the range of guidelines implemented by national regulatory bodies responsible for radiation protection in various countries worldwide. The aim of this study was to review and analyse the literature on patient release criteria (PRC) applied internationally in an attempt to achieve a justifiable approach to setting equivalent criteria in South Africa. In 2016, the South African Department of Health, Directorate: Radiation Control added conditions (numbers 50 and 90), to licences to use radioactive nuclides...
July 19, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28715496/transition-of-phase-response-properties-and-singularity-in-the-circadian-limit-cycle-of-cultured-cells
#2
Satoshi Koinuma, Hiroshi Kori, Isao T Tokuda, Kazuhiro Yagita, Yasufumi Shigeyoshi
The circadian system has been regarded as a limit cycle oscillator constructed by the integrated interaction of clock genes and proteins. Here, we investigated a mammalian circadian oscillation geometrically before and after a perturbation. We detected the singular point and transition from a type 1 to type 0 phase response curve (PRC) and determined the embedding dimension to show how many variables are needed to describe the limit cycle oscillation and relaxation process after a perturbation. As a perturbation, forskolin (FK) was administered to Rat-1 cells expressing the Per2::luc gene...
2017: PloS One
https://www.readbyqxmd.com/read/28708376/self-healing-nano-textured-vascular-like-materials-mode-i-crack-propagation
#3
Minwook Lee, Soumyadip Sett, Seongpil An, Sam Sukgoo Yoon, Alexander L Yarin
Here we investigate crack propagation initiated from an initial notch in a self-healing material. The crack propagation in the core-shell nanofiber mats formed by co-electrospinning and the composites reinforced by them is in focus. All samples are observed from the crack initiation until complete failure. Due to the short-time experiments done on purpose, the resin and cure released from the cores of the core-shell nanofibers could not achieve a complete curing and stop crack growth, especially given the fact that no heating was used...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28679862/mysm1-2a-dub-is-an-epigenetic-regulator-in-human-melanoma-and-contributes-to-tumor-cell-growth
#4
Christina Wilms, Carsten M Kroeger, Adelheid V Hainzl, Ishani Banik, Clara Bruno, Ioanna Krikki, Vida Farsam, Meinhard Wlaschek, Martina V Gatzka
Histone modifying enzymes, such as histone deacetylases (HDACs) and polycomb repressive complex (PRC) components, have been implicated in regulating tumor growth, epithelial-mesenchymal transition, tumor stem cell maintenance, or repression of tumor suppressor genes - and may be promising targets for combination therapies of melanoma and other cancers. According to recent findings, the histone H2A deubiquitinase 2A-DUB/Mysm1 interacts with the p53-axis in hematopoiesis and tissue differentiation in mice, in part by modulating DNA-damage responses in stem cell and progenitor compartments...
June 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/28673769/age-related-deficits-in-the-mnemonic-similarity-task-for-objects-and-scenes
#5
Shauna M Stark, Craig E L Stark
Using the Mnemonic Similarity Task (MST), we have demonstrated an age-related impairment in lure discrimination, or the ability to recognize an item as distinct from one that was similar, but not identical to one viewed earlier. A growing body of evidence links these behavioral changes to age-related alterations in the hippocampus. In this study, we sought to evaluate a novel version of this task, utilizing scenes that might emphasize the role of the hippocampus in contextual and spatial processing. In addition, we investigated whether, by utilizing two stimulus classes (scenes and objects), we could also interrogate the roles of the PRC and PHC in aging...
July 1, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28671737/the-phase-response-and-state-space-of-slow-wave-contractions-in-the-small-intestine
#6
Sean P Parsons, Jan D Huizinga
The interstitial cells of Cajal (ICC) generate electrical oscillations in the gut. Synchronisation of the ICC population is required for generation of coherent electrical waves ("slow waves") that cause muscular contraction and thereby move gut content. The phase response curve (PRC) is an experimental measure of the dynamical rules governing a population of oscillators, that determine their synchrony, and gives an experimental window onto the state space of the oscillator, its dynamical landscape. We measured the PRC of slow wave contractions in the mouse small intestine by the novel combination of diameter mapping and single pulse electrical field stimulation...
July 3, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28668267/measurement-of-phase-resetting-curves-using-optogenetic-barrage-stimuli
#7
Matthew H Higgs, Charles J Wilson
BACKGROUND: The phase resetting curve (PRC) is a primary measure of a rhythmically firing neuron's responses to synaptic input, quantifying the change in phase of the firing oscillation as a function of the input phase. PRCs provide information about whether neurons will synchronize due to synaptic coupling or shared input. However, PRC estimation has been limited to in vitro preparations where stable intracellular recordings can be obtained and background activity is minimal, and new methods are required for in vivo applications...
June 28, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28652965/a-protocol-for-manual-segmentation-of-medial-temporal-lobe-subregions-in-7%C3%A2-tesla-mri
#8
D Berron, P Vieweg, A Hochkeppler, J B Pluta, S-L Ding, A Maass, A Luther, L Xie, S R Das, D A Wolk, T Wolbers, P A Yushkevich, E Düzel, L E M Wisse
Recent advances in MRI and increasing knowledge on the characterization and anatomical variability of medial temporal lobe (MTL) anatomy have paved the way for more specific subdivisions of the MTL in humans. In addition, recent studies suggest that early changes in many neurodegenerative and neuropsychiatric diseases are better detected in smaller subregions of the MTL rather than with whole structure analyses. Here, we developed a new protocol using 7 Tesla (T) MRI incorporating novel anatomical findings for the manual segmentation of entorhinal cortex (ErC), perirhinal cortex (PrC; divided into area 35 and 36), parahippocampal cortex (PhC), and hippocampus; which includes the subfields subiculum (Sub), CA1, CA2, as well as CA3 and dentate gyrus (DG) which are separated by the endfolial pathway covering most of the long axis of the hippocampus...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28652613/flipping-between-polycomb-repressed-and-active-transcriptional-states-introduces-noise-in-gene-expression
#9
Gozde Kar, Jong Kyoung Kim, Aleksandra A Kolodziejczyk, Kedar Nath Natarajan, Elena Torlai Triglia, Borbala Mifsud, Sarah Elderkin, John C Marioni, Ana Pombo, Sarah A Teichmann
Polycomb repressive complexes (PRCs) are important histone modifiers, which silence gene expression; yet, there exists a subset of PRC-bound genes actively transcribed by RNA polymerase II (RNAPII). It is likely that the role of Polycomb repressive complex is to dampen expression of these PRC-active genes. However, it is unclear how this flipping between chromatin states alters the kinetics of transcription. Here, we integrate histone modifications and RNAPII states derived from bulk ChIP-seq data with single-cell RNA-sequencing data...
June 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28652430/the-contribution-of-mmp-7-promoter-polymorphisms-in-renal-cell-carcinoma
#10
Cheng-Hsi Liao, Wen-Shin Chang, Pei-Shin Hu, Hsi-Chin Wu, Shih-Wei Hsu, Yen-Fang Liu, Shih-Ping Liu, Huey-Shan Hung, DA-Tian Bau, Chia-Wen Tsai
BACKGROUND/AIM: Mounting evidence has suggested that polymorphisms in the promoters of matrix metalloproteinase (MMP) genes are associated with the risk of many types of cancer, but no study has ever explored these polymorphisms as biomarkers for renal cell cancer (RCC). Recently, it was suggested that serum MMP-7 levels have both diagnostic and prognostic potential for RCC. In this study, we focused on the contribution of two functional polymorphisms in the promoter region of MMP-7 (A-181G and C-153T) to RCC...
July 2017: In Vivo
https://www.readbyqxmd.com/read/28651891/neuroanatomical-alterations-and-synaptic-plasticity-impairment-in-the-perirhinal-cortex-of-the-ts65dn-mouse-model-of-down-syndrome
#11
Vincenzo Roncacé, Costanza Burattini, Fiorenza Stagni, Sandra Guidi, Andrea Giacomini, Marco Emili, Giorgio Aicardi, Renata Bartesaghi
Down syndrome (DS), a genetic condition due to triplication of Chromosome 21, is characterized by numerous neurodevelopmental alterations and intellectual disability. Individuals with DS and DS mouse models are impaired in several memory domains, including hippocampus-dependent declarative (spatial, in rodents) memory and visual recognition memory, a form of memory in which the perirhinal cortex (PRC) plays a fundamental role. The anatomo-functional substrates of hippocampus-dependent memory impairment have been largely elucidated in the Ts65Dn mouse model of DS...
June 23, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28651468/human-adolescent-phase-response-curves-to-bright-white-light
#12
Stephanie J Crowley, Charmane I Eastman
Older adolescents are particularly vulnerable to circadian misalignment and sleep restriction, primarily due to early school start times. Light can shift the circadian system and could help attenuate circadian misalignment; however, a phase response curve (PRC) to determine the optimal time for receiving light and avoiding light is not available for adolescents. We constructed light PRCs for late pubertal to postpubertal adolescents aged 14 to 17 years. Participants completed 2 counterbalanced 5-day laboratory sessions after 8 or 9 days of scheduled sleep at home...
June 1, 2017: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/28629990/employment-stability-in-veterans-and-service-members-with-traumatic-brain-injury-a-va-traumatic-brain-injury-model-systems-study
#13
Christina Dillahunt-Aspillaga, Mary Jo Pugh, Bridget A Cotner, Marc A Silva, Adam Haskin, Xinyu Tang, Marie E Saylors, Risa Nakase-Richardson
OBJECTIVE: To examine incidence and predictors of employment stability in Veterans and Military Service Members (V/SM) with traumatic brain injury (TBI) who return to work. DESIGN: Prospective observational cohort study. SETTING: Four Department of Veterans Affairs (VA) Polytrauma Rehabilitation Centers (PRCs). PARTICIPANTS: 110 V/SM with mild (26%), moderate (22%), or severe (52%) TBI enrolled in the VA PRC TBI Model Systems database within 2 years of injury who were discharged between January 2009 and June 2015...
June 16, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28622177/postoperative-respiratory-complications-in-patients-at-risk-for-obstructive-sleep-apnea-a-single-institution-cohort-study
#14
Satya Krishna Ramachandran, Jaideep Pandit, Scott Devine, Aleda Thompson, Amy Shanks
BACKGROUND: Obstructive sleep apnea (OSA) is a prevalent condition that is associated with early postoperative respiratory complications (PRCs). As the majority of patients with OSA are undiagnosed, preoperative screening remains the most efficient method to identify suspected OSA. METHODS: This retrospective study was performed on patients undergoing anesthesia in a single academic medical center. We assigned OSA risk class retrospectively to all patients in the study by using the Perioperative Sleep Apnea Prediction (PSAP) score...
July 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28618595/anticipated-synchronization-in-neuronal-circuits-unveiled-by-a-phase-response-curve-analysis
#15
Fernanda S Matias, Pedro V Carelli, Claudio R Mirasso, Mauro Copelli
Anticipated synchronization (AS) is a counterintuitive behavior that has been observed in several systems. When AS occurs in a sender-receiver configuration, the latter can predict the future dynamics of the former for certain parameter values. In particular, in neuroscience AS was proposed to explain the apparent discrepancy between information flow and time lag in the cortical activity recorded in monkeys. Despite its success, a clear understanding of the mechanisms yielding AS in neuronal circuits is still missing...
May 2017: Physical Review. E
https://www.readbyqxmd.com/read/28606125/age-is-associated-with-prognosis-in-serous-ovarian-carcinoma
#16
Fei Deng, Xia Xu, Mengmeng Lv, Binhui Ren, Yan Wang, Wenwen Guo, Jifeng Feng, Xiaoxiang Chen
PURPOSE: The survival duration of elderly patients with epithelial ovarian carcinoma is shorter than that of their younger counterparts. This variation in survival duration is likely attributed to differences in the distribution of histological type or grade, International Federation of Gynecology and Obstetrics (FIGO) staging, and undertreatment, but this observation remains controversial. This study aimed to investigate the biological factors other than selection bias associated with the decreased survival of elderly patients with ovarian carcinoma...
June 12, 2017: Journal of Ovarian Research
https://www.readbyqxmd.com/read/28602963/brain-activity-related-to-working-memory-for-temporal-order-and-object-information
#17
Brooke M Roberts, Laura A Libby, Marika C Inhoff, Charan Ranganath
Maintaining items in an appropriate sequence is important for many daily activities; however, remarkably little is known about the neural basis of human temporal working memory. Prior work suggests that the prefrontal cortex (PFC) and medial temporal lobe (MTL), including the hippocampus, play a role in representing information about temporal order. The involvement of these areas in successful temporal working memory, however, is less clear. Additionally, it is unknown whether regions in the PFC and MTL support temporal working memory across different timescales, or at coarse or fine levels of temporal detail...
June 8, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28583604/prediction-of-the-fertility-of-stallion-frozen-thawed-semen-using-a-combination-of-computer-assisted-motility-analysis-microscopical-observation-and-flow-cytometry
#18
I Barrier Battut, A Kempfer, N Lemasson, L Chevrier, S Camugli
Spermatozoa from some stallions do not maintain an acceptable fertility after freezing and thawing. The selection of frozen ejaculates that would be suitable for insemination is mainly based on post-thaw motility, but the prediction of fertility remains limited. A recent study in our laboratory has enabled the determination of a new protocol for the evaluation of fresh stallion semen, combining microscopical observation, computer-assisted motility analysis and flow cytometry, and providing a high level of fertility prediction...
July 15, 2017: Theriogenology
https://www.readbyqxmd.com/read/28562223/effect-of-phase-response-curve-shape-and-synaptic-driving-force-on-synchronization-of-coupled-neuronal-oscillators
#19
Ramana Dodla, Charles J Wilson
The role of the phase response curve (PRC) shape on the synchrony of synaptically coupled oscillating neurons is examined. If the PRC is independent of the phase, because of the synaptic form of the coupling, synchrony is found to be stable for both excitatory and inhibitory coupling at all rates, whereas the antisynchrony becomes stable at low rates. A faster synaptic rise helps extend the stability of antisynchrony to higher rates. If the PRC is not constant but has a profile like that of a leaky integrate-and-fire model, then, in contrast to the earlier reports that did not include the voltage effects, mutual excitation could lead to stable synchrony provided the synaptic reversal potential is below the voltage level the neuron would have reached in the absence of the interaction and threshold reset...
July 2017: Neural Computation
https://www.readbyqxmd.com/read/28553658/a-consistent-definition-of-phase-resetting-using-hilbert-transform
#20
Sorinel A Oprisan
A phase resetting curve (PRC) measures the transient change in the phase of a neural oscillator subject to an external perturbation. The PRC encapsulates the dynamical response of a neural oscillator and, as a result, it is often used for predicting phase-locked modes in neural networks. While phase is a fundamental concept, it has multiple definitions that may lead to contradictory results. We used the Hilbert Transform (HT) to define the phase of the membrane potential oscillations and HT amplitude to estimate the PRC of a single neural oscillator...
2017: International Scholarly Research Notices
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