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https://www.readbyqxmd.com/read/28088071/discrete-quasi-linear-viscoelastic-damping-analysis-of-connective-tissues-and-the-biomechanics-of-stretching
#1
Behzad Babaei, Aaron J Velasquez-Mao, Stavros Thomopoulos, Elliot L Elson, Steven D Abramowitch, Guy M Genin
The time- and frequency-dependent properties of connective tissue define their physiological function, but are notoriously difficult to characterize. Well-established tools such as linear viscoelasticity and the Fung quasi-linear viscoelastic (QLV) model impose forms on responses that can mask true tissue behavior. Here, we applied a more general discrete quasi-linear viscoelastic (DQLV) model to identify the static and dynamic time- and frequency-dependent behavior of rabbit medial collateral ligaments. Unlike the Fung QLV approach, the DQLV approach revealed that energy dissipation is elevated at a loading period of ∼10s...
December 22, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28087932/the-complexity-of-fungal-vision
#2
Reinhard Fischer, Jesus Aguirre, Alfredo Herrera-Estrella, Luis M Corrochano
Life, as we know it, would not be possible without light. Light is not only a primary source of energy, but also an important source of information for many organisms. To sense light, only a few photoreceptor systems have developed during evolution. They are all based on an organic molecule with conjugated double bonds that allows energy transfer from visible (or UV) light to its cognate protein to translate the primary physical photoresponse to cell-biological actions. The three main classes of receptors are flavin-based blue-light, retinal-based green-light (such as rhodopsin), and linear tetrapyrrole-based red-light sensors...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087888/simulated-microgravity-decreases-circulating-iron-in-rats-role-of-inflammation-induced-hepcidin-upregulation
#3
Thibault Cavey, Nicolas Pierre, Kévin Nay, Coralie Allain, Martine Ropert, Olivier Loréal, Frédéric Derbré
During spaceflight, humans exposed to microgravity exhibit an increase of iron storage and a reduction of circulating iron. Such perturbations could promote oxidative stress and anemia in astronauts. The mechanism by which microgravity modulates iron metabolism is still unknown. Herein, we hypothesized that microgravity up-regulates hepcidin, a hormone produced by the liver that is the main controller of iron homeostasis. To test this hypothesis, rats were submitted to hindlimb unloading (HU), the reference model to mimic the effects of microgravity in rodents...
January 13, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28087693/de-novo-genome-and-transcriptome-assembly-of-the-canadian-beaver-castor-canadensis
#4
Si Lok, Tara A Paton, Zhuozhi Wang, Gaganjot Kaur, Susan Walker, Ryan K C Yuen, Wilson W L Sung, Joseph Whitney, Janet A Buchanan, Brett Trost, Naina Singh, Beverly Apresto, Nan Chen, Matthew Coole, Travis J Dawson, Karen Y Ho, Zhizhou Hu, Sanjeev Pullenayegum, Kozue Samler, Arum Shipstone, Fiona Tsoi, Ting Wang, Sergio L Pereira, Pirooz Rostami, Carol Ann Ryan, Amy Hin Yan Tong, Karen Ng, Yogi Sundaravadanam, Jared T Simpson, Burton K Lim, Mark D Engstrom, Christopher J Dutton, Kevin C R Kerr, Maria Franke, William Rapley, Richard F Wintle, Stephen W Scherer
The Canadian beaver (Castor canadensis) is the largest indigenous rodent in North America. We report a draft annotated assembly of the beaver genome, the first for a large rodent and the first mammalian genome assembled directly from uncorrected and moderate coverage (< 30 ×) long-reads generated by single-molecule sequencing. The genome size is 2.7 Gb estimated by k-mer analysis. We assembled the beaver genome using the new Canu assembler optimized for noisy reads. The resulting assembly was refined using Pilon supported by shortreads (80 ×) and checked for accuracy by congruency against an independent short-read assembly...
January 13, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28087455/correlation-between-antigenicity-and-variability-in-the-vls-antigenic-variation-system-of-borrelia-burgdorferi
#5
Wei Zhou, Dustin Brisson
Many parasites have evolved antigenic variation systems that alter surface proteins in order to evade recognition by presently expressed antibodies and subsequent death. Although the amino acid positions in antigens to which antibodies most commonly target are expected to be the most variable, this assumption has not been investigated. Using the vls antigenic variation system of Borrelia burgdorferi as a model, we first investigated this assumption computationally and then developed a sensitive immunoassay to experimentally validate the computational results...
January 10, 2017: Microbes and Infection
https://www.readbyqxmd.com/read/28087422/nano-qsar-in-cell-biology-model-of-cell-viability-as-a-mathematical-function-of-available-eclectic-data
#6
Alla P Toropova, Andrey A Toropov
The prediction of biochemical endpoints is an important task of the modern medicinal chemistry, cell biology, and nanotechnology. Simplified molecular input-line entry system (SMILES) is a tool for representation of the molecular structure. In particular, SMILES can be used to build up the quantitative structure - property / activity relationships (QSPRs/QSARs). The QSPR/QSAR is a tool to predict an endpoint for a new substance, which has not been examined in experiment. Quasi-SMILES are representation of eclectic data related to an endpoint...
January 10, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28087339/differential-behavioral-sensitivity-to-carbon-dioxide-co2-inhalation-in-rats
#7
Andrew Winter, Rebecca Ahlbrand, Devanshi Naik, Renu Sah
Inhalation of carbon dioxide (CO2) is frequently employed as a biological challenge to evoke intense fear and anxiety. In individuals with panic disorder, CO2 reliably evokes panic attacks. Sensitivity to CO2 is highly heterogeneous among individuals, and although a genetic component is implicated, underlying mechanisms are not clear. Preclinical models that can simulate differential responsivity to CO2 are therefore relevant. In the current study we investigated CO2-evoked behavioral responses in four different rat strains: Sprague-Dawley (SD), Wistar (W), Long Evans (LE) and Wistar-Kyoto, (WK) rats...
January 10, 2017: Neuroscience
https://www.readbyqxmd.com/read/28087264/independent-impedimetric-analysis-of-two-cell-populations-co-cultured-on-opposite-sides-of-a-porous-support
#8
Kathrin Hajek, Joachim Wegener
The transepithelial or -endothelial electrical resistance (TEER) is a very common and routinely recorded parameter describing the expression of barrier-forming cell-cell contacts (tight junctions) in quantitative terms. To determine TEER, barrier-forming cell monolayers are cultured on porous filter supports that separate two fluid compartments. The frequency-dependent impedance of the cell layer is then recorded and analyzed by means of equivalent circuit modeling providing TEER and the cell layer capacitance...
January 10, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28087122/human-trophoblast-stem-cells-real-or-not-real
#9
Ching-Wen Chang, Mana M Parast
Abnormal trophoblast differentiation is the root cause of many placenta-based pregnancy complications, including preeclampsia and fetal growth restriction. Human trophoblast differentiation is difficult to study due to the lack of a stem cell model. Such a multipotent "trophoblast stem" (TS) cell, with the ability to differentiate into all trophoblast subtypes, has been derived from mouse blastocysts, but attempts to derive similar human cells have failed. We consider here several possibilities for the TS cell niche in the human placenta...
January 5, 2017: Placenta
https://www.readbyqxmd.com/read/28087003/in%C3%A2-vitro-generation-of-renal-tubular-epithelial-cells-from-fibroblasts-implications-for-precision-and-regenerative-medicine-in-nephrology
#10
Christina M Wyatt, Nicole Dubois
Prior efforts to generate renal epithelial cells in vitro have relied on pluripotent or bone marrow-derived mesenchymal stem cells. A recent publication in Nature Cell Biology describes the generation of induced tubular epithelial cells from fibroblasts, potentially offering a novel platform for personalized drug toxicity screening and in vitro disease modeling. This report serves as a promising proof of principle study and opens future research directions, including the optimization of the reprogramming process, efficient translation to adult human fibroblasts, and the generation of highly specific functional renal cell types...
February 2017: Kidney International
https://www.readbyqxmd.com/read/28081541/circular-rna-0000096-affects-cell-growth-and-migration-in-gastric-cancer
#11
Peifei Li, Huilin Chen, Shengcan Chen, Xiaoyan Mo, Tianwen Li, Bingxiu Xiao, Rui Yu, Junming Guo
BACKGROUND: Circular RNAs (circRNAs) are a class of non-coding RNAs broadly expressed in cells of various species. Their role in cancers, especially in gastric cancer, is poorly understood. METHODS: Circular RNA 0000096 (hsa_circ_0000096) levels in 101 paired gastric cancer tissues and adjacent non-tumorous tissues from patients with gastric cancer were detected by real-time quantitative reverse transcription-polymerase chain reaction. A receiver operating characteristic curve was generated to evaluate the diagnostic value of hsa_circ_0000096...
January 12, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28081465/biological-function-and-mechanism-of-lncrna-meg3-in-tenon-s-capsule-fibroblasts-proliferation-by-meg3-nrf2-protein-interaction
#12
Yuan Wang, Jing Wang, Li-Juan Wei, Dong-Mei Zhu, Jin-Song Zhang
OBJECTIVE: The proliferation of Tenon's capsule fibroblasts after glaucoma filtration surgery is a harmful element for operation failure. However, the underlying mechanism remains unclear. In this study, we evaluated the role of long non-coding RNA (lncRNA)-MEG3 in the proliferation of Glaucoma Tenon's capsule fibroblasts (GTFs) with a model of transforming growth factor-β (TGF-β)-induced proliferation which has been used in previous studies to explore the mechanism underlying glaucoma surgery failure...
January 9, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28081212/correction-a-stochastic-model-of-the-yeast-cell-cycle-reveals-roles-for-feedback-regulation-in-limiting-cellular-variability
#13
(no author information available yet)
[This corrects the article DOI: 10.1371/journal.pcbi.1005230.].
January 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28081209/mthfr-c677t-a1298c-and-ms-a2756g-gene-polymorphisms-and-male-infertility-risk-in-a-chinese-population-a-meta-analysis
#14
Zhengju Ren, Pengwei Ren, Bo Yang, Kun Fang, Shangqing Ren, Jian Liao, Shengzhuo Liu, Liangren Liu, Zhufeng Peng, Qiang Dong
BACKGROUND: Methylenetetrahydrofolate reductase gene (MTHFR C677T and A1298C) and methionine synthase gene (MS A2756G) polymorphisms have shown an association with male infertility risk in several ethnic populations. Although several studies have evaluated these associations in Chinese populations, their small sample sizes and inconsistent outcomes have prevented strong conclusions. Therefore, the present meta-analysis was performed with published studies to evaluate the associations of the three single nucleotide polymorphisms (SNPs) and male infertility in a Chinese population...
2017: PloS One
https://www.readbyqxmd.com/read/28081193/environmental-factors-can-influence-mitochondrial-inheritance-in-the-saccharomyces-yeast-hybrids
#15
Yu-Yi Hsu, Jui-Yu Chou
Mitochondria play a critical role in the generation of metabolic energy and are crucial for eukaryotic cell survival and proliferation. In most sexual eukaryotes, mitochondrial DNA (mtDNA) is inherited from only one parent in non-Mendelian inheritance in contrast to the inheritance of nuclear DNA. The model organism Saccharomyces cerevisiae is commonly used to study mitochondrial biology. It has two mating types: MATa and MATα. Previous studies have suggested that the mtDNA inheritance patterns in hybrid diploid cells depend on the genetic background of parental strains...
2017: PloS One
https://www.readbyqxmd.com/read/28081119/sclerostin-promotes-bone-remodeling-in-the-process-of-tooth-movement
#16
Rui Shu, Ding Bai, Tzongjen Sheu, Yao He, Xianrui Yang, Chaoran Xue, Yiruo He, Mengyuan Zhao, Xianglong Han
Tooth movement is a biological process of bone remodeling induced by mechanical force. Sclerostin secreted by osteocytes is mechanosensory and important in bone remodeling. However, little is known regarding the role of sclerostin in tooth movement. In this study, models of experimental tooth movement were established in rats and mice. Sclerostin expression was investigated with immunohistochemistry staining, and osteoclastic activity was analyzed with tartrate-resistant acid phosphatase (TRAP) staining. MLO-Y4 osteocyte-like cells underwent uniaxial compression and tension stress or were cultured in hypoxia conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28081010/biological-dose-representation-for-carbon-ion-radiotherapy-of-unconventional-fractionation
#17
Nobuyuki Kanematsu, Taku Inaniwa
In carbon-ion radiotherapy, single-beam delivery each day in alternate directions has been common practice for efficient operation, taking advantage of the Bragg peak and the relative biological effectiveness (RBE) for uniform dose conformation to a tumor. Treatments are usually fractionated and treatment plans are evaluated with the total RBE-weighted dose; however, this is of limited relevance to the biological effect. In this study, we reformulate the biologically effective dose (BED) to normalize the dose-fractionation and cell-repopulation effects as well as the RBE of treating radiation, based on inactivation of a reference cell line by a reference carbon-ion radiation...
January 12, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28080984/modelling-coffee-leaf-rust-risk-in-colombia-with-climate-reanalysis-data
#18
Daniel P Bebber, Ángela Delgado Castillo, Sarah J Gurr
Many fungal plant diseases are strongly controlled by weather, and global climate change is thus likely to have affected fungal pathogen distributions and impacts. Modelling the response of plant diseases to climate change is hampered by the difficulty of estimating pathogen-relevant microclimatic variables from standard meteorological data. The availability of increasingly sophisticated high-resolution climate reanalyses may help overcome this challenge. We illustrate the use of climate reanalyses by testing the hypothesis that climate change increased the likelihood of the 2008-2011 outbreak of Coffee Leaf Rust (CLR, Hemileia vastatrix) in Colombia...
December 5, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28080969/an-active-inference-theory-of-allostasis-and-interoception-in-depression
#19
Lisa Feldman Barrett, Karen S Quigley, Paul Hamilton
In this paper, we integrate recent theoretical and empirical developments in predictive coding and active inference accounts of interoception (including the Embodied Predictive Interoception Coding model) with working hypotheses from the theory of constructed emotion to propose a biologically plausible unified theory of the mind that places metabolism and energy regulation (i.e. allostasis), as well as the sensory consequences of that regulation (i.e. interoception), at its core. We then consider the implications of this approach for understanding depression...
November 19, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28080059/a-computational-approach-for-modeling-neutron-scattering-data-from-lipid-bilayers
#20
Jan-Michael Y Carrillo, John Katsaras, Bobby G Sumpter, Rana Ashkar
Biological cell membranes are responsible for a range of structural and dynamical phenomena crucial to a cell's well-being and its associated functions. Due to the complexity of cell membranes, lipid bilayer systems are often used as biomimetic models. These systems have led to significant insights into vital membrane phenomena such as domain formation, passive permeation and protein insertion. Experimental observations of membrane structure and dynamics are, however, limited in resolution, both spatially and temporally...
January 12, 2017: Journal of Chemical Theory and Computation
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