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https://www.readbyqxmd.com/read/27926936/scaling-properties-of-dimensionality-reduction-for-neural-populations-and-network-models
#1
Ryan C Williamson, Benjamin R Cowley, Ashok Litwin-Kumar, Brent Doiron, Adam Kohn, Matthew A Smith, Byron M Yu
Recent studies have applied dimensionality reduction methods to understand how the multi-dimensional structure of neural population activity gives rise to brain function. It is unclear, however, how the results obtained from dimensionality reduction generalize to recordings with larger numbers of neurons and trials or how these results relate to the underlying network structure. We address these questions by applying factor analysis to recordings in the visual cortex of non-human primates and to spiking network models that self-generate irregular activity through a balance of excitation and inhibition...
December 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27926907/mammalian-meiotic-recombination-a-toolbox-for-genome-evolution
#2
Laia Capilla, Montserrat Garcia Caldés, Aurora Ruiz-Herrera
Meiotic recombination is a process that increases genetic diversity and is fundamental for sexual reproduction. Determining by which mechanisms genetic variation is generated and maintained across different phylogenetic groups provides the basis for our understanding of biodiversity and evolution. In this review, we go through different aspects of this essential phenomenon, paying special attention to mammals. We provide a comprehensive view on the organization of meiotic chromosomes and the mechanisms involved in the formation and genomic distribution of recombination hotspots, focusing on the factors influencing the formation and repair of the massive amount of self-induced DNA breaks in early stages of meiosis...
December 8, 2016: Cytogenetic and Genome Research
https://www.readbyqxmd.com/read/27926892/do-mobile-phone-applications-improve-glycemic-control-hba1c-in-the-self-management-of-diabetes-a-systematic-review-meta-analysis-and-grade-of-14-randomized-trials
#3
REVIEW
Can Hou, Ben Carter, Jonathan Hewitt, Trevor Francisa, Sharon Mayor
OBJECTIVE: To investigate the effect of mobile phone applications (apps) on glycemic control (HbA1c) in the self-management of diabetes. RESEARCH DESIGN AND METHODS: Relevant studies that were published between 1 January 1996 and 1 June 2015 were searched from five databases: Medline, CINAHL, Cochrane Library, Web of Science, and Embase. Randomized controlled trials that evaluated diabetes apps were included. We conducted a systematic review with meta-analysis and GRADE (Grading of Recommendations Assessment, Development and Evaluation) of the evidence...
November 2016: Diabetes Care
https://www.readbyqxmd.com/read/27926872/deletion-of-the-polycomb-group-protein-ezh2-leads-to-compromised-self-renewal-and-differentiation-defects-in-human-embryonic-stem-cells
#4
Adam Collinson, Amanda J Collier, Natasha P Morgan, Arnold R Sienerth, Tamir Chandra, Simon Andrews, Peter J Rugg-Gunn
Through the histone methyltransferase EZH2, the Polycomb complex PRC2 mediates H3K27me3 and is associated with transcriptional repression. PRC2 regulates cell-fate decisions in model organisms; however, its role in regulating cell differentiation during human embryogenesis is unknown. Here, we report the characterization of EZH2-deficient human embryonic stem cells (hESCs). H3K27me3 was lost upon EZH2 deletion, identifying an essential requirement for EZH2 in methylating H3K27 in hESCs, in contrast to its non-essential role in mouse ESCs...
December 6, 2016: Cell Reports
https://www.readbyqxmd.com/read/27926868/cmyc-regulates-the-size-of-the-premigratory-neural-crest-stem-cell-pool
#5
Laura Kerosuo, Marianne E Bronner
The neural crest is a transient embryonic population that originates within the central nervous system (CNS) and then migrates into the periphery and differentiates into multiple cell types. The mechanisms that govern neural crest stem-like characteristics and self-renewal ability are poorly understood. Here, we show that the proto-oncogene cMyc is a critical factor in the chick dorsal neural tube, where it regulates the size of the premigratory neural crest stem cell pool. Loss of cMyc dramatically decreases the number of emigrating neural crest cells due to reduced self-renewal capacity, increased cell death, and shorter duration of the emigration process...
December 6, 2016: Cell Reports
https://www.readbyqxmd.com/read/27926863/chronic-infection-depletes-hematopoietic-stem-cells-through-stress-induced-terminal-differentiation
#6
Katie A Matatall, Mira Jeong, Siyi Chen, Deqiang Sun, Fengju Chen, Qianxing Mo, Marek Kimmel, Katherine Y King
Chronic infections affect a third of the world's population and can cause bone marrow suppression, a severe condition that increases mortality from infection. To uncover the basis for infection-associated bone marrow suppression, we conducted repeated infection of WT mice with Mycobacterium avium. After 4-6 months, mice became pancytopenic. Their hematopoietic stem and progenitor cells (HSPCs) were severely depleted and displayed interferon gamma (IFN-γ) signaling-dependent defects in self-renewal. There was no evidence of increased HSPC mobilization or apoptosis...
December 6, 2016: Cell Reports
https://www.readbyqxmd.com/read/27926842/intact-telopeptides-enhance-interactions-between-collagens
#7
Marjan Shayegan, Tuba Altindal, Evan Kiefl, Nancy R Forde
Collagen is the fundamental structural component of a wide range of connective tissues and of the extracellular matrix. It undergoes self-assembly from individual triple-helical proteins into well-ordered fibrils, a process that is key to tissue development and homeostasis, and to processes such as wound healing. Nucleation of this assembly is known to be slowed considerably by pepsin removal of short nonhelical regions that flank collagen's triple helix, known as telopeptides. Using optical tweezers to perform microrheology measurements, we explored the changes in viscoelasticity of solutions of collagen with and without intact telopeptides...
December 6, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27926808/evaluation-of-communication-and-acceptance-of-the-patients-by-medical-personnel
#8
Anna Włoszczak-Szubzda, Mirosław J Jarosz, Mariusz Goniewicz, Krzysztof Goniewicz
Background: The low level of patient satisfaction recorded in many studies and, at the same time, the level of frustration and burnout, disclosed by medics in the perception of the patient as a ‘problem’, incline to look for the causes of inadequate relationship between physician and patient. Objective: The aim of this study was to evaluate the level of acceptance of the patient by the medical personnel. The research problem was the acceptance level which was within the range of the communication skills of the nurses and doctors...
2016: Roczniki Państwowego Zakładu Higieny
https://www.readbyqxmd.com/read/27926745/a-retrospective-examination-of-the-effect-of-diabetes-on-sensory-processing-in-older-adults
#9
Larry E Humes
Purpose: The purpose of this article is to examine retrospectively the impact of diabetes mellitus on auditory, visual, and tactile processing in older adults. Method: Fourteen (10.4%) of a sample of 135 older adults self-reported the presence of diabetes mellitus in a study of sensory and cognitive processing across the adult lifespan. In this study, the performance of the subgroup with diabetes on a number of psychophysical sensory-processing measures was compared with that of the 121 older adults without diabetes...
December 7, 2016: American Journal of Audiology
https://www.readbyqxmd.com/read/27926687/an-initiative-to-standardize-the-identification-of-and-acute-response-to-postoperative-lower-extremity-neurological-deficits-effects-on-provider-knowledge-confidence-and-communication-skills
#10
Peter B Derman, Sravisht Iyer, Matthew Garner, Steven Orr, Karla J Felix, Allison Goldberg, Titilayo Ologhobo, Minlun Wu, Laura Robbins, Charles Cornell
BACKGROUND: Although relatively uncommon, neurological deficits following hip and knee arthroplasty can have permanent and debilitating consequences. This study was conducted to quantify the effectiveness of an educational curriculum aimed at standardizing the identification of and acute response to postoperative neurological deficits in the inpatient setting, specifically with respect to improvements in clinician knowledge, confidence levels, and communication skills. METHODS: A multidisciplinary committee at a single, high-volume academic institution created an algorithm delineating the appropriate clinical actions and escalation procedures in the setting of a postoperative neurological deficit for each clinical practitioner involved in care for patients who undergo arthroplasty...
December 7, 2016: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/27926668/brief-report-interpersonal-and-intrapersonal-factors-as-parallel-independent-mediators-in-the-association-between-internalized-hiv-stigma-and-art-adherence
#11
Victoria C Seghatol-Eslami, Heather E Dark, James L Raper, Michael J Mugavero, Janet M Turan, Bulent Turan
INTRODUCTION: People living with HIV (PLWH) need to adhere to antiretroviral therapy (ART) to achieve optimal health. One reason for ART nonadherence is HIV-related stigma. OBJECTIVES: We aimed to examine whether HIV treatment self-efficacy (an intrapersonal mechanism) mediates the stigma-adherence association. We also examined whether self-efficacy and the concern about being seen while taking HIV medication (an interpersonal mechanism) are parallel mediators independent of each other...
January 1, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/27926667/sexual-behaviors-and-hiv-status-a-population-based-study-among-older-adults-in-rural-south-africa
#12
Molly S Rosenberg, Francesc X Gómez-Olivé, Julia K Rohr, Brian C Houle, Chodziwadziwa W Kabudula, Ryan G Wagner, Joshua A Salomon, Kathleen Kahn, Lisa F Berkman, Stephen M Tollman, Till Bärnighausen
OBJECTIVE: To identify the unmet needs for HIV prevention among older adults in rural South Africa. METHODS: We analyzed data from a population-based sample of 5059 men and women aged 40 years and older from the study Health and Aging in Africa: Longitudinal Studies of INDEPTH Communities (HAALSI), which was carried out in the Agincourt health and sociodemographic surveillance system in the Mpumalanga province of South Africa. We estimated the prevalence of HIV (laboratory-confirmed and self-reported) and key sexual behaviors by age and sex...
January 1, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/27926660/radioembolization-induced-liver-disease-a-systematic-review
#13
Manon N G J A Braat, Karel J van Erpecum, Bernard A Zonnenberg, Maurice A J van den Bosch, Marnix G E H Lam
Radioembolization (RE) is a relatively novel treatment modality for primary and secondary hepatic malignancies. Microspheres embedded with a β-emitting radioisotope are injected into the hepatic artery, resulting in microsphere deposition in the tumor arterioles and normal portal triads. Microsphere deposition in nontumorous parenchyma can result in radiation-induced liver injury, with lethal RE-induced liver disease (REILD) at the outer end of the spectrum. The primary aim of this study was to evaluate RE-related hepatotoxicity and present an overview of the currently applied definitions and clinically relevant characteristics of REILD...
December 6, 2016: European Journal of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/27926649/association-of-gestational-weight-gain-expectations-and-advice-on-actual-weight-gain
#14
Rebecca A Krukowski, Delia S West, Marisha DiCarlo, Mario A Cleves, Marie E Saylors, Aline Andres
OBJECTIVE: To examine pregnant women's gestational weight gain expectations and advice from various sources (ie, self, family and friends, physician) and the association of these sources of expectations and advice with measured gestational weight gain. METHODS: This is a secondary analysis of a cohort study of 230 pregnant women in their second pregnancy. Each woman was queried at 12 weeks of gestation about the amount of weight: 1) she felt was "healthy" to gain, 2) she expected to gain, 3) her friends and family thought she should gain, and 4) the specificity of her physician's advice about gestational weight gain...
December 2, 2016: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/27926623/clinician-perceptions-of-teamwork-in-the-emergency-department-does-nurse-and-medical-provider-workspace-placement-make-a-difference
#15
Amy L Weaver, Susan Hernandez, Daiwai M Olson
OBJECTIVE: This study was intended to determine whether positioning emergency department (ED) physicians, physician assistants, and nurse practitioners at the same workstations as registered nurses (RNs) improved communication and teamwork. BACKGROUND: Historically in this organization, providers and staff had separate physical locations (workstations). Construction of a new ED provided the opportunity to redesign the physical layout and to study whether a new design improved the perception of communication and teamwork among medical providers...
January 2017: Journal of Nursing Administration
https://www.readbyqxmd.com/read/27926557/long-term-quality-of-life-of-patients-with-permanent-end-ileostomy-results-of-a-nationwide-cross-sectional-survey
#16
Tobias S Schiergens, Verena Hoffmann, Tamara N Schobel, Gerhard H Englert, Martin E Kreis, Wolfgang E Thasler, Jens Werner, Michael S Kasparek
BACKGROUND: Patients with permanent end ileostomy are at high risk for detrimental stomal effects on their quality of life. However, little is known about the long-term quality of life of these patients. OBJECTIVE: The purpose of this study was to assess long-term quality of life in patients with permanent end ileostomy. DATA SOURCES: Registration at the German self-help organization ILCO was used for this study. STUDY SELECTION: Selection included a cross-sectional survey of 1434 patients with permanent end ileostomy...
January 2017: Diseases of the Colon and Rectum
https://www.readbyqxmd.com/read/27926543/effects-of-exercise-interventions-and-physical-activity-behavior-on-cancer-related-cognitive-impairments-an-update
#17
Nils Schaffrath, Max Oberste, Philipp Zimmer
PURPOSE OF REVIEW: The purpose of this review is to give an update on studies investigating the influence of physical activity behavior and exercise interventions on cancer-related cognitive impairments. RECENT FINDINGS: Cross-sectional and observational studies underline previous findings, revealing an association of cancer patients' fitness and their cognitive functions. Results from interventional studies are sparse. Only one study investigated self-perceived cognitive function in breast cancer patients as a secondary outcome, indicating no effects...
December 6, 2016: Current Opinion in Supportive and Palliative Care
https://www.readbyqxmd.com/read/27926514/novel-amphiphilic-folic-acid-cholesterol-chitosan-micelles-for-paclitaxel-delivery
#18
Li-Chun Cheng, Yan Jiang, Yu Xie, Lu-Lu Qiu, Qing Yang, Hui-Yi Lu
In order to decrease the toxicity of paclitaxel (PTX) and increase the efficiency, we developed an amphiphilic PTX injection system using a biodegradable and biocompatible polymer synthesized by folic acid, cholesterol, and chitosan (FACC). This FACC-based polymer had a low critical concentration (64.13μg/ml) and could self-assemble in aqueous condition to form nanoscale micelles. The particle sizes of FACC-PTX micelles were 253.2±0.56 nm, the encapsulation efficiency and loading capacity of these FACC-PTX micelles were 65...
December 1, 2016: Oncotarget
https://www.readbyqxmd.com/read/27926453/quantifying-motivation-with-effort-based-decision-making-paradigms-in-health-and-disease
#19
T T-J Chong, V Bonnelle, M Husain
Motivation can be characterized as a series of cost-benefit valuations, in which we weigh the amount of effort we are willing to expend (the cost of an action) in return for particular rewards (its benefits). Human motivation has traditionally been measured with self-report and questionnaire-based tools, but an inherent limitation of these methods is that they are unable to provide a mechanistic explanation of the processes underlying motivated behavior. A major goal of current research is to quantify motivation objectively with effort-based decision-making paradigms, by drawing on a rich literature from nonhuman animals...
2016: Progress in Brain Research
https://www.readbyqxmd.com/read/27926448/increasing-self-directed-training-in-neurorehabilitation-patients-through-competition
#20
B Studer, H Van Dijk, R Handermann, S Knecht
This proof-of-concept study aimed to test whether competition could be a useful tool to increase intensity and amount of self-directed training in neurorehabilitation. Stroke patients undergoing inpatient neurorehabilitation (n=93) conducted self-directed endurance training on a (wheelchair-compatible) bicycle trainer under three experimental conditions: a "Competition" condition and two noncompetition control conditions (repeated randomized within-subject design). Training performance and perceived exertion were recorded and statistically analyzed...
2016: Progress in Brain Research
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