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https://www.readbyqxmd.com/read/28535602/quantifying-postglacial-sediment-storage-and-denudation-rates-in-a-small-alpine-catchment-of-the-f%C3%A4-g%C3%A4-ra%C3%A8-mountains-romania
#1
Adrian C Ardelean, Alexandru Onaca, Petru Urdea, Adriana Sărășan
The study of sediment production, transport, storage and discharge in alpine drainage basins is an essential prerequisite for a better understanding of the postglacial evolution of the alpine landscape. To get an overview on sediment production and alpine landscape evolution in Romania, the current study presents the first alpine sediment storage quantification in the Romanian Carpathians. Postglacial denudation was quantified within the small alpine catchment of the Doamnei Valley (3.62km(2)), located in the central part of the Făgăraș Mountains...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28535564/the-different-dynamic-changes-of-nerve-growth-factor-in-the-dorsal-horn-and-dorsal-root-ganglion-leads-to-hyperalgesia-and-allodynia-in-diabetic-neuropathic-pain
#2
Zhifeng Gao, Yi Feng, Hui Ju
BACKGROUND: Diabetic peripheral neuropathy (DPN) is the most common complication of diabetes and more than half of the patients with DPN have self-reported symptoms referring to painful diabetic neuropathy (PDN). Nerve growth factor (NGF) is a key factor for the nervous system, but the role of it in the neuropathic pain of diabetic patients is unclear. OBJECTIVE: This study aimed to investigate the relationship between the dynamic expression of NGF in dorsal horn and dorsal root ganglion (DRG) of diabetic rats and hyperalgesia and allodynia in diabetic neuropathic pain...
May 2017: Pain Physician
https://www.readbyqxmd.com/read/28535435/multi-segmental-thoracic-spine-kinematics-measured-dynamically-in-the-young-and-elderly-during-flexion
#3
Dominika Ignasiak, Andrea Rüeger, Stephen J Ferguson
In contrast to the cervical and lumbar region, the normal kinematics of the thoracic spine have not been thoroughly investigated. The aim of this study was to characterize normal multi-segmental continuous motion of the whole thoracolumbar spine, during a flexion maneuver, in young and elderly subjects. Forty-two healthy volunteers were analyzed: 21 young (age=27.00±3.96) and 21 elderly (age=70.1±3.85). Spinal motion was recorded with a motion-capture system and analyzed using a 3rd order polynomial function to approximate spinal curvature throughout the motion sequence...
May 20, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28535428/a-regional-market-oriented-governance-for-disaster-management-a-new-planning-approach
#4
Erwin A Blackstone, Simon Hakim, Brian Meehan
This paper proposes a regional competitive governance and management of response and recovery from disasters. It presents problems experienced in major disasters, analyzes the failures, and suggests how a competitive system that relies on private and volunteer regional leaders, personnel, and capital can improve preparation, response and recovery efforts over the existing government system. A Public Choice approach is adopted to explain why government often fails, and how regional governance may be socially more efficient than the existing federal- state-local funded and managed disaster system...
May 13, 2017: Evaluation and Program Planning
https://www.readbyqxmd.com/read/28535418/a-study-of-peritoneal-metastatic-xenograft-model-of-colorectal-cancer-in-the-treatment-of-hyperthermic-intraperitoneal-chemotherapy-with-raltitrexed
#5
Cen Qiu, Yueqi Li, Xin Liang, Yingxue Qi, Yiyang Chen, Xianke Meng, Hongtu Zheng, Ye Xu, Sanjun Cai, Guoxiang Cai, Jianwen Liu
Peritoneal metastasis of colorectal cancer is one of the most incident and fateful diseases among relapse cases. It shows a certain resistance to systemic chemotherapy. The perfusion system in clinic is complex and hard to be used in fundamental researches. This study aims at evaluating the effect of an improved hyperthermic intraperitoneal chemotherapy with Raltitrexed used in tumor-bearing mice with peritoneal metastatic colorectal carcinoma. The results showed that no severe adverse effect was observed. All control animals developed extensive peritoneal and mesenteric metastatic nodes...
May 20, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28535410/effect-of-enzyme-inhibition-on-perampanel-pharmacokinetics-why-study-design-matters
#6
Barry E Gidal, Rama Maganti, Antonio Laurenza, Haichen Yang, David A Verbel, Edgar Schuck, Jim Ferry
OBJECTIVES: Perampanel, a selective, noncompetitive AMPA receptor antagonist, is indicated as adjunctive therapy for the treatment of partial seizures with or without secondarily generalized seizures and primary generalized tonic-clonic seizures in patients with epilepsy aged 12years and older. In vitro studies and Phase I trials indicate that perampanel is metabolized almost exclusively by CYP3A, with an elimination half-life (t1/2) averaging approximately 105h. Understanding of pharmacokinetic (PK) interactions-enzyme inhibition or induction-and anticipating their occurrence are important for management of patients with epilepsy...
April 26, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28535370/epithelial-patterning-morphogenesis-and-evolution-drosophila-eggshell-as-a-model
#7
REVIEW
Miriam Osterfield, Celeste A Berg, Stanislav Y Shvartsman
Understanding the mechanisms driving tissue and organ formation requires knowledge across scales. How do signaling pathways specify distinct tissue types? How does the patterning system control morphogenesis? How do these processes evolve? The Drosophila egg chamber, where EGF and BMP signaling intersect to specify unique cell types that construct epithelial tubes for specialized eggshell structures, has provided a tractable system to ask these questions. Work there has elucidated connections between scales of development, including across evolutionary scales, and fostered the development of quantitative modeling tools...
May 22, 2017: Developmental Cell
https://www.readbyqxmd.com/read/28535348/coarse-grained-modeling-of-polyethylene-melts-effect-on-dynamics
#8
Brandon L Peters, K Michael Salerno, Anupriya Agrawal, Dvora Perahia, Gary S Grest
The distinctive viscoelastic behavior of polymers results from a coupled interplay of motion on multiple length and time scales. Capturing the broad time and length scales of polymer motion remains a challenge. Using polyethylene (PE) as a model macromolecule, we construct coarse-grained (CG) models of PE with 3-6 methyl groups per CG bead and probe two critical aspects of the technique: pressure corrections required after iterative Boltzmann inversion (IBI) to generate CG potentials that match the pressure of reference fully-atomistic melt simulations and the transferability of CG potentials across temperatures...
May 23, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28535347/preparation-and-characterization-of-protein-loaded-electrospun-fiber-mat-and-its-release-kinetics
#9
Peng Wen, Yan Wen, Xiao Huang, Minhua Zong, Hong Wu
For the enhancement of protein's bioavailability, a specific delivery system was developed by coaxial electrospinning. Bovine serum albumin (BSA) was used as protein model and the core-sheath fiber mat was fabricated using sodium alginate as shell layer and the BSA-loaded chitosan nanoparticle that prepared previously as core layer. By optimizing electrospinning parameters, uniform fibers with diameters ranging from 200 nm to 600 nm were obtained, and transmission electron microscopy and confocal laser scanning microscopy revealed its core-sheath structure...
May 23, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28535337/overall-structural-model-of-ns5a-protein-from-hepatitis-c-virus-and-modulation-by-mutations-confering-resistance-of-virus-replication-to-cyclosporin-a
#10
Aurelie Badillo, Veronique Brechot, Stephane Sarrazin, François-Xavier Cantrelle, Frederic Delolme, Marie-Laure Fogeron, Jennifer Molle, Roland Montserret, Anja Bockmann, Ralf Bartenschlager, Volker Lohmann, Guy Lippens, Sylvie Ricard-Blum, Xavier Hanoulle, Francois Penin
Hepatitis C virus (HCV) nonstructural protein 5A (NS5A) is a RNA-binding phosphoprotein composed of a N-terminal membrane anchor (AH), a structured domain 1 (D1) and two intrinsically disordered domains (D2 and D3). The knowledge of the functional architecture of this multifunctional protein remains limited. We report here that NS5A-D1D2D3 produced in a wheat germ cell-free system is obtained under a highly phosphorylated state. Its NMR analysis revealed that these phosphorylations do not change the disordered nature of D2 and D3 domains but increase the number of conformers due to partial phosphorylations...
May 23, 2017: Biochemistry
https://www.readbyqxmd.com/read/28535319/linking-the-heart-and-the-head-humanism-and-professionalism-in-medical-education-and-practice
#11
Lynda Montgomery, Sana Loue, Kurt C Stange
This paper articulates a practical interpretive framework for understanding humanism in medicine through the lens of how it is taught and learned. Beginning with a search for key tensions and relevant insights in the literature on humanism in health professions education, we synthesized a conceptual model designed to foster reflection and action to realize humanistic principles in medical education and practice. The resulting model centers on the interaction between the heart and the head. The heart represents the emotive domains of empathy, compassion, and connectedness...
May 2017: Family Medicine
https://www.readbyqxmd.com/read/28535311/quantification-of-estradiol-uptake-in-zebrafish-embryos-and-larvae
#12
J Paige Souder, Daniel A Gorelick
Zebrafish are a powerful model system to assess the molecular and cellular effects of exposure to toxic chemicals during embryonic development. To study the effects of environmental endocrine disruptors, embryos and larvae are commonly exposed to supraphysiologic concentrations of these compounds in the water, but their bioavailability in zebrafish is largely unknown. One hypothesis is that supraphysiologic concentrations of estrogens in the water are required to achieve physiologic levels in vivo, however this has not been directly tested...
May 23, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28535287/a-flow-cytometry-based-screen-identifies-mbnl1-modulators-that-rescue-splicing-defects-in-myotonic-dystrophy-type-i
#13
Fan Zhang, Nicole E Bodycombe, Keith M Haskell, Yumei L Sun, Eric T Wang, Carl A Morris, Lyn H Jones, Lauren D Wood, Mathew T Pletcher
Myotonic Dystrophy Type 1 (DM1) is a rare genetic disease caused by expansion of CTG trinucleotide repeats ((CTG)exp) in the 3' untranslated region of the DMPK gene. The repeat transcripts sequester the RNA binding protein Muscleblind-like protein 1 (MBNL1) and hamper its normal function in pre-mRNA splicing. Overexpressing exogenous MBNL1 in the DM1 mouse model has been shown to rescue the splicing defects and reverse myotonia. Although a viable therapeutic strategy, pharmacological modulators of MBNL1 expression have not been identified...
May 23, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28535205/a-transcriptional-serenaid-the-role-of-noncoding-rnas-in-class-switch-recombination
#14
William T Yewdell, Jayanta Chaudhuri
During an immune response, activated B cells may undergo class switch recombination (CSR), a molecular rearrangement that allows B cells to switch from expressing IgM and IgD to a secondary antibody heavy chain isotype such as IgG, IgA, or IgE. Secondary antibody isotypes provide the adaptive immune system with distinct effector functions to optimally combat various pathogens. CSR occurs between repetitive DNA elements within the immunoglobulin heavy chain (Igh) locus, termed switch (S) regions, and requires the DNA modifying enzyme activation-induced cytidine deaminase (AID)...
May 23, 2017: International Immunology
https://www.readbyqxmd.com/read/28535201/regulatory-t-cells-ameliorate-tissue-plasminogen-activator-induced-brain-haemorrhage-after-stroke
#15
Leilei Mao, Peiying Li, Wen Zhu, Wei Cai, Zongjian Liu, Yanling Wang, Wenli Luo, Ruth A Stetler, Rehana K Leak, Weifeng Yu, Yanqin Gao, Jun Chen, Gang Chen, Xiaoming Hu
Delayed thrombolytic treatment with recombinant tissue plasminogen activator (tPA) may exacerbate blood-brain barrier breakdown after ischaemic stroke and lead to lethal haemorrhagic transformation. The immune system is a dynamic modulator of stroke response, and excessive immune cell accumulation in the cerebral vasculature is associated with compromised integrity of the blood-brain barrier. We previously reported that regulatory T cells, which function to suppress excessive immune responses, ameliorated blood-brain barrier damage after cerebral ischaemia...
May 22, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28535186/fxr-gankyrin-axis-is-involved-in-development-of-pediatric-liver-cancer
#16
Leila Valanejad, Kyle Lewis, Mary Wright, Yanjun Jiang, Amber D'Souza, Rebekah Karns, Rachel Sheridan, Anita Gupta, Kevin Bove, David Witte, James Geller, Gregory Tiao, David L Nelson, Lubov Timchenko, Nikolai Timchenko
The development of hepatoblastoma (HBL) is associated with failure of hepatic stem cells (HSC) to differentiate into hepatocytes. Despite intensive investigations, mechanisms of the failure of HSC to differentiate are not known. We found that oncogene Gankyrin (Gank) is involved in the inhibition of differentiation of HSC via triggering degradation of tumor suppressor proteins (TSPs) Rb, p53, C/EBPα and HNF4α. Our data show that the activation of a repressor of Gank, farnesoid X receptor, FXR, after initiation of liver cancer by Diethylnitrosamine (DEN) prevents the development of liver cancer by inhibiting Gank and rescuing tumor suppressor proteins...
May 23, 2017: Carcinogenesis
https://www.readbyqxmd.com/read/28535183/time-caloric-restriction-inhibits-the-neoplastic-transformation-of-cirrhotic-liver-in-rats-treated-with-diethylnitrosamine
#17
Christian Molina-Aguilar, María de Jesús Guerrero-Carrillo, Jesús Javier Espinosa-Aguirre, Sitlali Olguin-Reyes, Thania Castro-Belio, Olivia Vázquez-Martínez, Julieta Berenice Rivera-Zavala, Mauricio Díaz-Muñoz
Hepatocellular cancer is the most common type of primary liver cancer. Cirrhosis is the main risk factor that generates this malady. It has been proven that caloric restriction protocols and restricted feeding schedules are protective in experimental carcinogenic models. We tested the influence of a time-caloric restriction protocol (2 h of food access during the daytime for 18 weeks) in an experimental model of cirrhosis-hepatocarcinoma produced by weekly administration of diethylnitrosamine. Our results indicate that time-caloric restriction reduced hepatomegaly and prevented the increase in blood leukocytes promoted by diethylnitrosamine...
May 23, 2017: Carcinogenesis
https://www.readbyqxmd.com/read/28535149/quantitative-computational-models-of-molecular-self-assembly-in-systems-biology
#18
Marcus Thomas, Russell Schwartz
Molecular self-assembly is the dominant form of chemical reaction in living systems, yet efforts at systems biology modeling are only beginning to appreciate the need for and challenges to accurate quantitative modeling of self-assembly. Self-assembly reactions are essential to nearly every important process in cell and molecular biology and handling them is thus a necessary step in building comprehensive models of complex cellular systems. They present exceptional challenges, however, to standard methods for simulating complex systems...
May 23, 2017: Physical Biology
https://www.readbyqxmd.com/read/28535148/stochastic-gene-expression-conditioned-on-large-deviations
#19
Jordan M Horowitz, Rahul V Kulkarni
The intrinsic stochasticity of gene expression can give rise to large fluctuations and rare events that drive phenotypic variation in a population of genetically identical cells. Characterizing the fluctuations that give rise to such rare events motivates the analysis of large deviations in stochastic models of gene expression. Recent developments in non-equilibrium statistical mechanics have led to a framework for analyzing Markovian processes conditioned on rare events and for representing such processes by conditioning-free driven Markovian processes...
May 23, 2017: Physical Biology
https://www.readbyqxmd.com/read/28535127/modelling-virus-coinfection-to-inform-management-of-maize-lethal-necrosis-in-kenya
#20
Frank Hilker, Linda Allen, Vrushali Bokil, Cheryl Briggs, Zhilan Feng, Karen A Garrett, Louis Gross, Frédéric Hamelin, Michael J Jeger, Carrie Manore, Alison Power, Margaret Redinbaugh, Megan Rúa, Nik J Cunniffe
Maize lethal necrosis (MLN) has emerged as a serious threat to food security in sub-Saharan Africa. MLN is caused by coinfection with two viruses, maize chlorotic mottle virus (MCMV) and a potyvirus, often sugarcane mosaic virus (SCMV). To better understand dynamics of MLN and to provide insight into disease management, we model the spread of the viruses causing MLN within and between growing seasons. The model allows for transmission via vectors, soil and seeds, as well as exogenous sources of infection. Following model parameterisation, we predict how management affects disease prevalence and crop performance over multiple seasons...
May 23, 2017: Phytopathology
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