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https://www.readbyqxmd.com/read/29149767/the-effects-of-sleep-on-the-neural-correlates-of-pattern-separation
#1
Christopher R Doxey, Cooper Hodges, Ty Bodily, Nathan M Muncy, C Brock Kirwan
Effective memory representations must be specific to prevent interference between episodes that may overlap in terms of place, time, or items present. Pattern separation, a computational process performed by the hippocampus, overcomes this interference by establishing non-overlapping memory representations. Although it is widely accepted that declarative memories are consolidated during sleep, the effects of sleep on pattern separation have yet to be elucidated. We used whole-brain, high-resolution functional neuroimaging to investigate the effects of sleep on a task that places high demands on pattern separation...
November 17, 2017: Hippocampus
https://www.readbyqxmd.com/read/29149660/a-systems-level-approach-for-investigating-organophosphorus-pesticide-toxicity
#2
Jingbo Zhu, Jing Wang, Yan Ding, Baoyue Liu, Wei Xiao
The full understanding of the single and joint toxicity of a variety of organophosphorus (OP) pesticides is still unavailable, because of the extreme complex mechanism of action. This study established a systems-level approach based on systems toxicology to investigate OP pesticide toxicity by incorporating ADME/T properties, protein prediction, and network and pathway analysis. The results showed that most OP pesticides are highly toxic according to the ADME/T parameters, and can interact with significant receptor proteins to cooperatively lead to various diseases by the established OP pesticide -protein and protein-disease networks...
November 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29149597/structural-basis-for-shelterin-bridge-assembly
#3
Jin-Kwang Kim, Jinqiang Liu, Xichan Hu, Clinton Yu, Kyle Roskamp, Banumathi Sankaran, Lan Huang, Elizabeth A Komives, Feng Qiao
Telomere elongation through telomerase enables chromosome survival during cellular proliferation. The conserved multifunctional shelterin complex associates with telomeres to coordinate multiple telomere activities, including telomere elongation by telomerase. Similar to the human shelterin, fission yeast shelterin is composed of telomeric sequence-specific double- and single-stranded DNA-binding proteins, Taz1 and Pot1, respectively, bridged by Rap1, Poz1, and Tpz1. Here, we report the crystal structure of the fission yeast Tpz1(475-508)-Poz1-Rap1(467-496) complex that provides the structural basis for shelterin bridge assembly...
November 16, 2017: Molecular Cell
https://www.readbyqxmd.com/read/29149455/positive-effect-on-patient-experience-of-video-information-given-prior-to-cardiovascular-magnetic-resonance-imaging-a-clinical-trial
#4
Britt-Marie Ahlander, Jan Engvall, Eva Maret, Elisabeth Ericsson
AIMS: To evaluate the effect of video information given before cardiovascular magnetic resonance imaging on patient anxiety and to compare patient experiences of cardiovascular magnetic resonance imaging versus myocardial perfusion scintigraphy. To evaluate if additional information has an impact on motion artefacts. BACKGROUND: Cardiovascular magnetic resonance imaging and myocardial perfusion scintigraphy are technically advanced methods for the evaluation of heart diseases...
November 17, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/29149378/-ocular-sarcoidosis-diagnosis-and-therapy
#5
E Gundlach, B Temmesfeld-Wollbrück, U Pleyer
Sarcoidosis is a multisystem disorder of unknown cause. Ophthalmic involvement occurs in up to 60% of all patients, often as the first manifestation of sarcoidosis. Because of the heterogeneous clinical presentation diagnosis can be difficult; therefore the International Workshop on Ocular Sarcoidosis (IWOS 2009) diagnostic criteria based on clinical presentation, laboratory investigations and imaging techniques enable establishment of the diagnosis. Patients suffering from sarcoidosis should be treated by both ophthalmologists and internal physicians...
September 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/29149348/mechanistic-insight-into-the-assembly-of-the-hera-nura-helicase-nuclease-dna-end-resection-complex
#6
Zainab Ahdash, Andy M Lau, Robert Thomas Byrne, Katja Lammens, Alexandra Stüetzer, Henning Urlaub, Paula J Booth, Eamonn Reading, Karl-Peter Hopfner, Argyris Politis
The HerA-NurA helicase-nuclease complex cooperates with Mre11 and Rad50 to coordinate the repair of double-stranded DNA breaks. Little is known, however, about the assembly mechanism and activation of the HerA-NurA. By combining hybrid mass spectrometry with cryo-EM, computational and biochemical data, we investigate the oligomeric formation of HerA and detail the mechanism of nucleotide binding to the HerA-NurA complex from thermophilic archaea. We reveal that ATP-free HerA and HerA-DNA complexes predominantly exist in solution as a heptamer and act as a DNA loading intermediate...
November 16, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29149169/the-role-of-allee-effect-in-modelling-post-resection-recurrence-of-glioblastoma
#7
Zoltan Neufeld, William von Witt, Dora Lakatos, Jiaming Wang, Balazs Hegedus, Andras Czirok
Resection of the bulk of a tumour often cannot eliminate all cancer cells, due to their infiltration into the surrounding healthy tissue. This may lead to recurrence of the tumour at a later time. We use a reaction-diffusion equation based model of tumour growth to investigate how the invasion front is delayed by resection, and how this depends on the density and behaviour of the remaining cancer cells. We show that the delay time is highly sensitive to qualitative details of the proliferation dynamics of the cancer cell population...
November 17, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29149149/decreased-regional-grey-matter-volume-in-women-with-chronic-whiplash-associated-disorders-relationships-with-cognitive-deficits-and-disturbed-pain-processing
#8
Iris Coppieters, Robby De Pauw, Karen Caeyenberghs, Lieven Danneels, Jeroen Kregel, Astrid Pattyn, Mira Meeus, Barbara Cagnie
BACKGROUND: Patients with chronic whiplash-associated disorders (CWAD) are characterized by pain of traumatic origin, cognitive deficits, and central sensitization (CS). Previous neuroimaging studies revealed altered grey matter volume (GMV) in mild traumatic brain injury patients and chronic pain conditions also characterized by CS. It can therefore be hypothesized that GMV alterations also play a role in the persistent complaints of CWAD. However, brain alterations remain poorly investigated in these patients...
November 2017: Pain Physician
https://www.readbyqxmd.com/read/29149142/mapping-the-association-between-vitamin-d-and-low-back-pain-a-systematic-review-and-meta-analysis-of-observational-studies
#9
Joshua Zadro, Debra Shirley, Manuela Ferreira, Ana Paula Carvalho-Silva, Sarah E Lamb, Cyrus Cooper, Paulo H Ferreira
BACKGROUND: Low back pain (LBP) is the highest contributor to disability worldwide, with current intervention strategies only providing small to moderate analgesic effects. The use of vitamin D supplementation for LBP has gained interest due to its proposed anti-inflammatory and neuromodulatory properties. However, it is still unclear whether vitamin D levels differ between those with and without LBP or if vitamin D levels are associated with pain intensity. OBJECTIVES: We aim to investigate the association between vitamin D levels and LBP and to determine if vitamin D levels correlate with pain intensity in individuals with LBP...
November 2017: Pain Physician
https://www.readbyqxmd.com/read/29148794/preparation-and-formation-process-of-zn-ii-coordinated-nanovesicles
#10
Wuxiao Ding, Naohiro Kameta, Hiroyuki Minamikawa, Mitsutoshi Masuda, Masaki Kogiso
Mixing a glycylglycine-lipid and zinc acetate has been reported to form novel supramolecular Zn(II)-coordinated nanovesicles in ethanol. In this study, we investigate in detail the formation of nanovesicles by using three lipids at different temperatures and discuss their formation process. The original lipids show extremely low solubilities and appear as plate structures in ethanol. Within a small window of lipid solubility, the formation of lipid-Zn(II) complexes occurs mainly on the solid surfaces of plate structures...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148779/hydrogen-uptake-on-coordinatively-unsaturated-metal-sites-in-vsb-5-revisited-strong-binding-affinity-leading-to-high-temperature-d2-h2-selectivity
#11
Amit Sharma, Keith V Lawler, Jarod J Wolffis, Christopher T Eckdahl, Cooper S McDonald, Jesse L C Rowsell, Stephen A Fitzgerald, Paul M Forster
We examine the adsorption of hydrogen and deuterium into the nanoporous nickel phosphate, VSB-5. Based on gas sorption analysis, VSB-5 exhibits one of the highest measured H2 heats of adsorption (HOA) for hydrogen (16 kJ/mol) yet reported. This high HOA is consistent with an unusually large redshift in the Q(1) and Q(0) hydrogen vibrational modes as measured with in situ IR spectroscopy. The HOA for D2 is measured to be 2 kJ/mol higher than for H2. Ideal Adsorbed Solution Theory analysis of H2 and D2 isotherms provides selectivities above 4 for deuterium at 140 K, suggesting that VSB-5 is a promising adsorbent for pressure-swing adsorption type separations of hydrogen isotopes...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148741/controlling-association-and-separation-of-gold-nanoparticles-with-computationally-designed-zinc-coordinating-proteins
#12
Matthew J Eibling, Christopher M MacDermaid, Zhaoxia Qian, Christopher J Lanci, So-Jung Park, Jeffery G Saven
Functionalization of nanoparticles with biopolymers has yielded a wide range of structured and responsive hybrid materials. DNA provides the ability to program length and recognition using complementary oligonucleotide sequences. Nature more often leverages the versatility of proteins, however, where structure, assembly, and recognition are more subtle to engineer. Herein, a protein was computationally designed to present multiple Zn(2+) coordination sites and cooperatively self-associate to form an antiparallel helical homodimer...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148620/perceptions-of-adults-with-overweight-obesity-and-chronic-musculoskeletal-pain-an-interpretative-phenomenological-analysis
#13
Lesley Cooper, Louisa Ells, Cormac Ryan, Denis Martin
AIMS: To gain insight into the lived experience of adults with overweight/obesity and chronic musculoskeletal pain (CMP). Knowledge gained will inform healthcare professionals about the complexity of the weight-pain relationship and enable more effective engagement with this population BACKGROUND: Quantitative studies show links between weight and pain. Adults with overweight/obesity are more likely to experience comorbidity however, qualitative research describing the complexities of the relationship is limited...
November 17, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/29148342/undiagnosed-and-uncontrolled-chronic-conditions-in-china-could-social-health-insurance-consolidation-make-a-change
#14
Xing Lin Feng
Policy makers in China are considering consolidating the country's fragmented health insurance programs. This system consists of three components. The Urban Employee Basic Medical Insurance (UEBMI) covers formal employees, the New Cooperative Medical Scheme (NCMS) covers rural residents, and the Urban Resident Basic Medical Insurance (URBMI) covers urban residents. Consolidation could, in theory, create a more efficient health system that is better able to address noncommunicable diseases. Using national survey data during 2011 to 2013, I found that 44% to 76% cases of hypertension, diabetes, and dyslipidemia went undiagnosed among Chinese adults aged 45 and older...
February 1, 2017: Medical Care Research and Review: MCRR
https://www.readbyqxmd.com/read/29147941/artificial-bio-nanomachines-based-on-protein-needles-derived-from-bacteriophage-t4
#15
REVIEW
Hiroshi Inaba, Takafumi Ueno
Bacteriophage T4 is a natural bio-nanomachine which achieves efficient infection of host cells via cooperative motion of specific three-dimensional protein architectures. The relationships between the protein structures and their dynamic functions have recently been clarified. In this review we summarize the design principles for fabrication of nanomachines using the component proteins of bacteriophage T4 based on these recent advances. We focus on the protein needle known as gp5, which is located at the center of the baseplate at the end of the contractile tail of bacteriophage T4...
November 16, 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/29147914/novice-chimpanzees-cooperate-successfully-in-the-presence-of-experts-but-may-have-limited-understanding-of-the-task
#16
Malini Suchak, Julia Watzek, Luke F Quarles, Frans B M de Waal
Despite many observations of cooperation in nature, laboratory studies often fail to find careful coordination between individuals who are solving a cooperative task. Further, individuals tested are often naïve to cooperative tasks and there has been little exploration of partnerships with mixed expertise. In the current study, we examined acquisition of a cooperative pulling task in a group with both expert (N = 4) and novice (N = 11) chimpanzees (Pan troglodytes). We used five measures of competence and understanding: (1) success at the task, (2) latency to succeed, (3) efficiency, (4) uncoordinated pulling, and (5) pulling when a partner was present versus absent...
November 17, 2017: Animal Cognition
https://www.readbyqxmd.com/read/29147841/radiotherapy-for-extramedullary-leukaemic-manifestation-chloroma
#17
Michael Oertel, Khaled Elsayad, Uwe Haverkamp, Matthias Stelljes, Hans Theodor Eich
PURPOSE: Extramedullary leukaemic disease (EMD, synonym chloroma) is a rare solid manifestation of myeloid leukaemia for which the value of radiotherapy (RT) as a treatment strategy remains controversial. The aim of this study is to analyse the effectiveness of various RT doses for EMD in the modern treatment era. MATERIALS AND METHODS: Between January 2000 and June 2016, 20 patients with total of 45 lesions underwent RT for EMD at our institution. RESULTS: With a median radiation dose of 26 Gy (range 4-42 Gy), local remission could be achieved in 91% of patients (complete remission rate: 71%)...
November 16, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/29147682/synthesis-and-application-of-injectable-bioorthogonal-dendrimer-hydrogels-for-local-drug-delivery
#18
Leyuan Xu, Remy C Cooper, Juan Wang, W Andrew Yeudall, Hu Yang
We developed novel dendrimer hydrogels (DH)s on the basis of bioorthogonal chemistry, in which polyamidoamine (PAMAM) dendrimer generation 4.0 (G4) functionalized with strained alkyne dibenzocyclooctyne (DBCO) via PEG spacer (Mn = 2,000 g/mol) underwent strain-promoted azide-alkyne cycloaddition (SPAAC) with polyethylene glycol bisazide (PEG-BA) (Mn= 20,000 g/mol) to generate a dendrimer-PEG cross-linked network. This platform offers a high degree of functionality and modularity. A wide range of structural parameters including dendrimer generation, degree of PEGylation, loading density of clickable DBCO groups, PEG-BA chain length as well as the ratio of clickable dendrimer to PEG-BA and their concentrations can be readily manipulated to tune chemical and physical properties of DHs...
August 14, 2017: ACS Biomaterials Science & Engineering
https://www.readbyqxmd.com/read/29147576/erlotinib-intercalating-pemetrexed-cisplatin-versus-erlotinib-alone-in-chinese-patients-with-brain-metastases-from-lung-adenocarcinoma-a-prospective-non-randomised-concurrent-controlled-trial-nct01578668
#19
Haihong Yang, Qiuhua Deng, Yuan Qiu, Jun Huang, Yubao Guan, Fengnan Wang, Xin Xu, Xinyun Yang
Objective: Erlotinib has a synergistic effect with pemetrexed for treating non-squamous non-small-cell lung cancer. We investigated the efficacy and safety of erlotinib (E) in combination with pemetrexed/cisplatin (E-P) in Chinese patients with lung adenocarcinoma with brain metastases. Design: Patients who were erlotinib-naïve or pemetrexed-naïve were assigned in parallel to receive either E or E-P. The primary endpoint was the intracranial overall response rate (ORRi)...
2017: ESMO Open
https://www.readbyqxmd.com/read/29147538/scaling-behaviour-and-rate-determining-steps-in-filamentous-self-assembly
#20
Georg Meisl, Luke Rajah, Samuel A I Cohen, Manuela Pfammatter, Anđela Šarić, Erik Hellstrand, Alexander K Buell, Adriano Aguzzi, Sara Linse, Michele Vendruscolo, Christopher M Dobson, Tuomas P J Knowles
The formation of filaments from naturally occurring protein molecules is a process at the core of a range of functional and aberrant biological phenomena, such as the assembly of the cytoskeleton or the appearance of aggregates in Alzheimer's disease. The macroscopic behaviour associated with such processes is remarkably diverse, ranging from simple nucleated growth to highly cooperative processes with a well-defined lagtime. Thus, conventionally, different molecular mechanisms have been used to explain the self-assembly of different proteins...
October 1, 2017: Chemical Science
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