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https://www.readbyqxmd.com/read/28350467/relating-chromophoric-and-structural-disorder-in-conjugated-polymers
#1
Lena Simine, Peter J Rossky
The optoelectronic properties of amorphous conjugated polymers are sensitive to the details of the conformational disorder and spectroscopy provides the means for structural characterization of the fragments of the chain which interact with light - "chromophores". A faithful interpretation of spectroscopic conformational signatures, however, presents a theoretical challenge. Here we investigate the relationship between the ground state optical gaps, the properties of the excited states, and the structural features of chromophores of a single molecule poly(3-hexyl)-thiophene (P3HT), using quantum-classical atomistic simulations...
March 28, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28346443/genome-wide-association-study-of-glioma-subtypes-identifies-specific-differences-in-genetic-susceptibility-to-glioblastoma-and-non-glioblastoma-tumors
#2
Beatrice S Melin, Jill S Barnholtz-Sloan, Margaret R Wrensch, Christoffer Johansen, Dora Il'yasova, Ben Kinnersley, Quinn T Ostrom, Karim Labreche, Yanwen Chen, Georgina Armstrong, Yanhong Liu, Jeanette E Eckel-Passow, Paul A Decker, Marianne Labussière, Ahmed Idbaih, Khe Hoang-Xuan, Anna-Luisa Di Stefano, Karima Mokhtari, Jean-Yves Delattre, Peter Broderick, Pilar Galan, Konstantinos Gousias, Johannes Schramm, Minouk J Schoemaker, Sarah J Fleming, Stefan Herms, Stefanie Heilmann, Markus M Nöthen, Heinz-Erich Wichmann, Stefan Schreiber, Anthony Swerdlow, Mark Lathrop, Matthias Simon, Marc Sanson, Ulrika Andersson, Preetha Rajaraman, Stephen Chanock, Martha Linet, Zhaoming Wang, Meredith Yeager, John K Wiencke, Helen Hansen, Lucie McCoy, Terri Rice, Matthew L Kosel, Hugues Sicotte, Christopher I Amos, Jonine L Bernstein, Faith Davis, Dan Lachance, Ching Lau, Ryan T Merrell, Joellen Shildkraut, Francis Ali-Osman, Siegal Sadetzki, Michael Scheurer, Sanjay Shete, Rose K Lai, Elizabeth B Claus, Sara H Olson, Robert B Jenkins, Richard S Houlston, Melissa L Bondy
Genome-wide association studies (GWAS) have transformed our understanding of glioma susceptibility, but individual studies have had limited power to identify risk loci. We performed a meta-analysis of existing GWAS and two new GWAS, which totaled 12,496 cases and 18,190 controls. We identified five new loci for glioblastoma (GBM) at 1p31.3 (rs12752552; P = 2.04 × 10(-9), odds ratio (OR) = 1.22), 11q14.1 (rs11233250; P = 9.95 × 10(-10), OR = 1.24), 16p13.3 (rs2562152; P = 1.93 × 10(-8), OR = 1.21), 16q12...
March 27, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28346091/a-high-throughput-screening-model-of-the-tumor-microenvironment-for-ovarian-cancer-cell-growth
#3
Madhu Lal-Nag, Lauren McGee, Rajarshi Guha, Ernst Lengyel, Hilary A Kenny, Marc Ferrer
The tumor microenvironment plays an important role in the processes of tumor growth, metastasis, and drug resistance. We have used a multilayered 3D primary cell culture model that reproduces the human ovarian cancer metastatic microenvironment to study the effect of the microenvironment on the pharmacological responses of different classes of drugs on cancer cell proliferation. A collection of oncology drugs was screened to identify compounds that inhibited the proliferation of ovarian cancer cells growing as monolayers or forming spheroids, on plastic and on a 3D microenvironment culture model of the omentum metastatic site, and also cells already in preformed spheroids...
January 1, 2017: SLAS Discov
https://www.readbyqxmd.com/read/28344778/methodological-advances-in-imaging-intravital-axonal-transport
#4
REVIEW
James N Sleigh, Alessio Vagnoni, Alison E Twelvetrees, Giampietro Schiavo
Axonal transport is the active process whereby neurons transport cargoes such as organelles and proteins anterogradely from the cell body to the axon terminal and retrogradely in the opposite direction. Bi-directional transport in axons is absolutely essential for the functioning and survival of neurons and appears to be negatively impacted by both aging and diseases of the nervous system, such as Alzheimer's disease and amyotrophic lateral sclerosis. The movement of individual cargoes along axons has been studied in vitro in live neurons and tissue explants for a number of years; however, it is currently unclear as to whether these systems faithfully and consistently replicate the in vivo situation...
2017: F1000Research
https://www.readbyqxmd.com/read/28344081/plasma-membrane-crpk1-mediated-phosphorylation-of-14-3-3-proteins-induces-their-nuclear-import-to-fine-tune-cbf-signaling-during-cold-response
#5
Ziyan Liu, Yuxin Jia, Yanglin Ding, Yiting Shi, Zhen Li, Yan Guo, Zhizhong Gong, Shuhua Yang
In plant cells, changes in fluidity of the plasma membrane may serve as the primary sensor of cold stress; however, the precise mechanism and how the cell transduces and fine-tunes cold signals remain elusive. Here we show that the cold-activated plasma membrane protein cold-responsive protein kinase 1 (CRPK1) phosphorylates 14-3-3 proteins. The phosphorylated 14-3-3 proteins shuttle from the cytosol to the nucleus, where they interact with and destabilize the key cold-responsive C-repeat-binding factor (CBF) proteins...
March 21, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28343713/workplace-violence-against-women-nurses-working-in-two-public-sector-hospitals-of-lahore-pakistan
#6
Sara Rizvi Jafree
BACKGROUND: Cultural and structural forces help sustain workplace violence (WPV) against feminized professions like nursing in Pakistan. PURPOSE: The purpose of this study was to identify the prevalence and patterns of workplace violence (WPV) against women nurses (more than 95% of entire nursing population) in two hospitals of Pakistan. METHODS: A standardized international survey developed by the World Health Organization was used to collect cross-sectional data...
January 19, 2017: Nursing Outlook
https://www.readbyqxmd.com/read/28343196/-hope-as-psychological-resource-for-nurturant-professionals-medicine-case-study
#7
Наталия Е Водопьянова, Вера А Чикер, Валерия В Потявина
INTRODUCTION: In the article, the issues concerning hope, which is one of the most important resources for specialists of many nurturant professions, are observed. The theoretical analysis of hope and its categorization from the perspective of subjective and resource-based view is given. The special scientific and practical interest to human subjective and personal resources is determined by their unique role not only in human life support, but also in overcoming hard situations and extreme obstacles, including crisis situations in professional activity, with the example of the profession of a doctor...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28342281/incorporating-in-situ-habitat-patchiness-in-site-selection-models-reveals-that-site-fidelity-is-not-always-a-consequence-of-animal-choice
#8
Aline S Martinez, Eduardo V Queiroz, Mitch Bryson, Maria Byrne, Ross A Coleman
1.Understanding site fidelity is important in animal ecology, but evidence is lacking that this behaviour is due to an animal choosing a specific location. To discern site selection behaviour it is necessary to consider the spatial distribution of habitats that animals can occupy within a landscape. Tracking animals and defining clear habitat boundaries, however, is often difficult. 2.We use in situ habitat distribution data and animal movement simulations to investigate behavioural choice in site fidelity patterns...
March 25, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28336572/the-computational-and-neural-basis-of-rhythmic-timing-in-medial-premotor-cortex
#9
Hugo Merchant, Bruno B Averbeck
The neural underpinnings of rhythmic behavior, including music and dance, have been studied using the synchronization-continuation task (SCT), where subjects initially tap in synchrony with an isochronous metronome and then keep tapping at a similar rate via an internal beat mechanism. Here, we provide behavioral and neural evidence that supports a resetting drift-diffusion model (DDM) during SCT. Behaviorally, we show the model replicates the linear relation between the mean and standard-deviation of the intervals produced by monkeys in SCT...
March 23, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28334823/h3-y-discriminates-between-hira-and-daxx-chaperone-complexes-and-reveals-unexpected-insights-into-human-daxx-h3-3-h4-binding-and-deposition-requirements
#10
Lisa-Maria Zink, Erwan Delbarre, H Christian Eberl, Eva C Keilhauer, Clemens Bönisch, Sebastian Pünzeler, Marek Bartkuhn, Philippe Collas, Matthias Mann, Sandra B Hake
Histone chaperones prevent promiscuous histone interactions before chromatin assembly. They guarantee faithful deposition of canonical histones and functionally specialized histone variants into chromatin in a spatial- and temporally-restricted manner. Here, we identify the binding partners of the primate-specific and H3.3-related histone variant H3.Y using several quantitative mass spectrometry approaches, and biochemical and cell biological assays. We find the HIRA, but not the DAXX/ATRX, complex to recognize H3...
February 21, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28334383/a-critical-role-of-inhibition-in-temporal-processing-maturation-in-the-primary-auditory-cortex
#11
Dongqin Cai, Rongrong Han, Miaomiao Liu, Fenghua Xie, Ling You, Yi Zheng, Limin Zhao, Jun Yao, Yiwei Wang, Yin Yue, Christoph E Schreiner, Kexin Yuan
Faithful representation of sound envelopes in primary auditory cortex (A1) is vital for temporal processing and perception of natural sounds. However, the emergence of cortical temporal processing mechanisms during development remains poorly understood. Although cortical inhibition has been proposed to play an important role in this process, direct in-vivo evidence has been lacking. Using loose-patch recordings in rat A1 immediately after hearing onset, we found that stimulus-following ability in fast-spiking neurons was significantly better than in regular-spiking (RS) neurons...
March 1, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28333598/achieving-health-equity-through-community-engagement-in-translating-evidence-to-policy-the-san-francisco-health-improvement-partnership-2010-2016
#12
Kevin Grumbach, Roberto A Vargas, Paula Fleisher, Tomás J Aragón, Lisa Chung, Colleen Chawla, Abbie Yant, Estela R Garcia, Amor Santiago, Perry L Lang, Paula Jones, Wylie Liu, Laura A Schmidt
BACKGROUND: The San Francisco Health Improvement Partnership (SFHIP) promotes health equity by using a novel collective impact model that blends community engagement with evidence-to-policy translational science. The model involves diverse stakeholders, including ethnic-based community health equity coalitions, the local public health department, hospitals and health systems, a health sciences university, a school district, the faith community, and others sectors. COMMUNITY CONTEXT: We report on 3 SFHIP prevention initiatives: reducing consumption of sugar sweetened beverages (SSBs), regulating retail alcohol sales, and eliminating disparities in children's oral health...
March 23, 2017: Preventing Chronic Disease
https://www.readbyqxmd.com/read/28333434/measurement-of-in-vivo-protein-binding-affinities-in-a-signaling-network-with-mass-spectrometry
#13
Mumun Gencoglu, Alexander Schmidt, Attila Becskei
Protein interaction networks play a key role in signal processing. Despite the progress in identifying the interactions, the quantification of their strengths lags behind. Here we present an approach to quantify the in vivo binding of proteins to their binding partners in signaling-transcriptional networks, by the pairwise genetic isolation of each interaction and by varying the concentration of the interacting components over time. The absolute quantification of the protein concentrations was performed with targeted mass spectrometry...
March 23, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28333163/universality-of-schmidt-decomposition-and-particle-identity
#14
Stefania Sciara, Rosario Lo Franco, Giuseppe Compagno
Schmidt decomposition is a widely employed tool of quantum theory which plays a key role for distinguishable particles in scenarios such as entanglement characterization, theory of measurement and state purification. Yet, its formulation for identical particles remains controversial, jeopardizing its application to analyze general many-body quantum systems. Here we prove, using a newly developed approach, a universal Schmidt decomposition which allows faithful quantification of the physical entanglement due to the identity of particles...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28332888/clinician-and-patient-acceptability-of-self-collected-human-papillomavirus-testing-for-cervical-cancer-screening
#15
Constance Mao, Shalini L Kulasingam, Hilary K Whitham, Stephen E Hawes, John Lin, Nancy B Kiviat
BACKGROUND: To evaluate clinician and patient attitudes toward home self-collected human papillomavirus (HPV) testing for cervical cancer screening. METHODS: Women aged 21-65 years were recruited for a randomized trial comparing home self-collected HPV testing to standard clinician-collected Pap screening. Participants were surveyed about their attitudes toward self-collected HPV testing. Clinicians performing cervical cancer screening in University of Washington medical clinics were also surveyed to determine their acceptability of self-collected HPV testing...
March 23, 2017: Journal of Women's Health
https://www.readbyqxmd.com/read/28330487/a-qualitative-study-of-participants-views-on-re-consent-in-a-longitudinal-biobank
#16
Mary Dixon-Woods, David Kocman, Liz Brewster, Janet Willars, Graeme Laurie, Carolyn Tarrant
BACKGROUND: Biomedical research increasingly relies on long-term studies involving use and re-use of biological samples and data stored in large repositories or "biobanks" over lengthy periods, often raising questions about whether and when a re-consenting process should be activated. We sought to investigate the views on re-consent of participants in a longitudinal biobank. METHODS: We conducted a qualitative study involving interviews with 24 people who were participating in a longitudinal biobank...
March 23, 2017: BMC Medical Ethics
https://www.readbyqxmd.com/read/28327602/glucocorticoid-suppression-of-osteocyte-perilacunar-remodeling-is-associated-with-subchondral-bone-degeneration-in-osteonecrosis
#17
Tristan W Fowler, Claire Acevedo, Courtney M Mazur, Faith Hall-Glenn, Aaron J Fields, Hrishikesh A Bale, Robert O Ritchie, Jeffrey C Lotz, Thomas P Vail, Tamara Alliston
Through a process called perilacunar remodeling, bone-embedded osteocytes dynamically resorb and replace the surrounding perilacunar bone matrix to maintain mineral homeostasis. The vital canalicular networks required for osteocyte nourishment and communication, as well as the exquisitely organized bone extracellular matrix, also depend upon perilacunar remodeling. Nonetheless, many questions remain about the regulation of perilacunar remodeling and its role in skeletal disease. Here, we find that suppression of osteocyte-driven perilacunar remodeling, a fundamental cellular mechanism, plays a critical role in the glucocorticoid-induced osteonecrosis...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28327123/evaluating-the-sub-national-fidelity-of-national-initiatives-in-decentralized-health-systems-integrated-primary-health-care-governance-in-nigeria
#18
Ejemai Amaize Eboreime, Seye Abimbola, Felix Abrahams Obi, Obinna Ebirim, Olalekan Olubajo, John Eyles, Nonhlanhla Lynette Nxumalo, Faith Nankasa Mambulu
BACKGROUND: Policy making, translation and implementation in politically and administratively decentralized systems can be challenging. Beyond the mere sub-national acceptance of national initiatives, adherence to policy implementation processes is often poor, particularly in low and middle-income countries. In this study, we explore the implementation fidelity of integrated PHC governance policy in Nigeria's decentralized governance system and its implications on closing implementation gaps with respect to other top-down health policies and initiatives...
March 21, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28325102/building-up-and-breaking-down-mechanisms-controlling-recombination-during-replication
#19
Dana Branzei, Barnabas Szakal
The complete and faithful duplication of the genome is an essential prerequisite for proliferating cells to maintain genome integrity. This objective is greatly challenged by DNA damage encountered during replication, which causes fork stalling and in certain cases, fork breakage. DNA damage tolerance (DDT) pathways mitigate the effects on fork stability induced by replication fork stalling by mediating damage-bypass and replication fork restart. These DDT mechanisms, largely relying on homologous recombination (HR) and specialized polymerases, can however contribute to genome rearrangements and mutagenesis...
March 22, 2017: Critical Reviews in Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28324664/limited-understanding-of-the-functional-diversity-of-n-linked-glycans-as-a-major-gap-of-prion-biology
#20
Ilia V Baskakov
Among a broad range of hypotheses on the molecular nature of transmissible spongiform encephalopathy or scrapie agents discussed in 1960s was a hypothesis of self-replicating polysaccharides. While the studies of the past 40 years provided unambiguous proof that this is not the case, emerging evidence suggests that carbohydrates in the form of sialylated N-linked glycans, which are a constitutive part of mammalian prions or PrP(Sc), are essential in determining prion fate in an organism. The current extra-view article discusses recent advancements on the role of N-linked glycans and specifically their sialylation status in controlling prion fate...
March 21, 2017: Prion
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