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https://www.readbyqxmd.com/read/28107770/different-parts-different-stories-climate-sensitivity-of-growth-is-stronger-in-root-collars-versus-stems-in-tundra-shrubs
#1
Pascale Ropars, Sandra Angers-Blondin, Marianne Gagnon, Isla H Myers-Smith, Esther Lévesque, Stéphane Boudreau
Shrub densification has been widely reported across the circumpolar arctic and subarctic biomes in recent years. Long-term analyses based on dendrochronological techniques applied to shrubs have linked this phenomenon to climate change. However, the multi-stemmed structure of shrubs makes them difficult to sample and therefore leads to non-uniform sampling protocols among shrub ecologists, who will favor either root collars or stems to conduct dendrochronological analyses. Through a comparative study of the use of root collars and stems of Betula glandulosa, a common North American shrub species, we evaluated the relative sensitivity of each plant part to climate variables, and assessed if this sensitivity is consistent across three different types of environments in northwestern Québec, Canada (terrace, hilltop and snowbed)...
January 20, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28107739/on-the-synthesis-of-nanostructured-akermanite-scaffolds-via-space-holder-method-the-effect-of-the-spacer-size-on-the-porosity-and-mechanical-properties
#2
Aliakbar Najafinezhad, Majid Abdellahi, Sepideh Nasiri-Harchegani, Ali Soheily, Mohammadsaleh Khezri, Hamid Ghayour
In the present study, for the first time, the space holder method was used to prepare akermanite scaffolds with high porous structures, high interconnectivity, and high compressive strength, while the role of different spacer sizes on the akermanite scaffold properties was also evaluated. The results showed that the increase in the NaCl particle size which was used as spacer leads to an increase of the pore size and interconnectivity and a decrease of compressive strength. When the size of the spacer was 420-600µm and more than 600µm, a total porosity of 82 and 83% and a compressive strength of 0...
January 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28107717/diclofenac-can-exhibit-estrogenic-modes-of-action-in-male-xenopus-laevis-and-affects-the-hypothalamus-pituitary-gonad-axis-and-mating-vocalizations
#3
Norah Johanna Efosa, Wibke Kleiner, Werner Kloas, Frauke Hoffmann
Diclofenac (DCF) is a non-steroidal analgesic and antiphlogistic. Due to its tremendous use, DCF can be found in the environment, especially in sewage, but also surface waters, ground and drinking water. Previous studies indicated that DCF can modulate the reproductive physiology of fish by altering the expression of important key enzymes of the hypothalamus-pituitary-gonad-axis (HPG-axis) and might act as an estrogenic endocrine disrupting chemical (EDC). Other studies, however, demonstrated that DCF does not exhibit any estrogenicity...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28107708/acid-base-treated-vermiculite-as-high-performance-adsorbent-insights-into-the-mechanism-of-cationic-dyes-adsorption-regeneration-recyclability-and-stability-studies
#4
Wojciech Stawiński, Agnieszka Węgrzyn, Tomasz Dańko, Olga Freitas, Sónia Figueiredo, Lucjan Chmielarz
Additional treatment with NaOH of acid activated vermiculite results in even higher increase in the adsorption capacity in comparison to samples modified only in acidic solution (first step of activation) with respect to raw material. Optimization of treatment conditions and adsorption capacity for two cationic dyes (methylene blue (MB) and astrazon red (AR)), also as binary mixture, was evaluated. The capacity, based on column studies, increased from 48 ± 2 to 203 ± 4 mg g(-1) in the case of methylene blue and from 51 ± 1 to 127 ± 2 mg g(-1) in the case of astrazon red on starting and acid-base treated material, respectively...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28107706/beneficial-effect-of-cu-on-ti-nb-ta-zr-sputtered-uniform-adhesive-gum-films-accelerating-bacterial-inactivation-under-indoor-visible-light
#5
Akram Alhussein, Sofiane Achache, Regis Deturche, Frederic Sanchette, Cesar Pulgarin, John Kiwi, Sami Rtimi
This article presents the evidence for the significant effect of copper accelerating the bacterial inactivation on Ti-Nb-Ta-Zr (TNTZ) sputtered films on glass up to a Cu content of 8.3 at.%. These films were deposited by dc magnetron co-sputtering of an alloy target Ti-23Nb-0.7Ta-2Zr (at.%) and a Cu target. The fastest bacterial inactivation of E. coli on this later TNTZ-Cu surface proceeded within ∼75min. The films deposited by magnetron sputtering are chemically homogenous. The film roughness evaluated by atomic force spectroscopy (AFM) on the TNTZ-Cu 8...
January 15, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28107702/c1qbp-regulates-ybx1-to-suppress-the-androgen-receptor-ar-enhanced-rcc-cell-invasion
#6
Dan Yue, Yong Wang, Yin Sun, Yuanjie Niu, Chawnshang Chang
Early studies suggested that the androgen receptor (AR) might play important roles to promote the renal cell carcinoma (RCC) progression; however, the detailed mechanisms remain unclear. Here we demonstrated the higher YBX1 expression with lower C1QBP expression in human RCC clinical tissues, and the intensity of C1QBP was negatively correlated with the YBX1 nuclear expression. Mechanism dissection found C1QBP could interact with YBX1 to suppress the YBX1 activation via altering the YBX1 phosphorylation and nuclear translocation in RCC cells...
January 17, 2017: Neoplasia: An International Journal for Oncology Research
https://www.readbyqxmd.com/read/28107698/the-natural-flavonoid-apigenin-sensitizes-human-cd44-prostate-cancer-stem-cells-to-cisplatin-therapy
#7
Suat Erdogan, Kader Turkekul, Rıza Serttas, Zeynep Erdogan
Prostate cancer (PCa) is the second most common type of cancer and the fifth leading cause of cancer-related death among men. Development of chemoresistance, tumor relapse and metastasis remain major barriers to effective treatment and all been identified to be associated with cancer stem cells (CSCs). Natural flavonoids such as apigenin have been shown to have the ability to improve the therapeutic efficacy of common chemotherapy agents through CSCs sensitization. Thus, the aim of this study was to evaluate the combination of apigenin with cisplatin on CD44(+) PCa stem cell growth and migration...
January 17, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28107697/egcg-a-tea-polyphenol-as-a-potential-mitigator-of-hematopoietic-radiation-injury-in-mice
#8
Mrinalini Tiwari, Bhakti Dixit, Suhel Parvez, Paban K Agrawala
Agents capable of providing protection, mitigation or therapy against radiation injuries have long been of interest of radiation biologists owing to the ever expanding application of radiation in our day to day life despite the well reported ill effects of exposure. The current study investigates radiomitigating potential of EGCG (epigallocatechin gallate), a tea polyphenol with known DNMT inhibitory property, in C57 Bl/6 mice model. Treatment with 0.1833mg/kg body weight EGCG, 1.5h post-irradiation to lethally whole body irradiated mice rendered 45% survival for 30days and also helped restoring the body weight of the animals...
January 17, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28107692/rna-binding-protein-msi2-positively-regulates-flt3-expression-in-myeloid-leukemia
#9
Ayuna Hattori, Daniel McSkimming, Natarajan Kannan, Takahiro Ito
FLT3 is frequently mutated and overexpressed in acute myelogenous leukemia (AML) and other hematologic malignancies. Although signaling events downstream of FLT3 receptor tyrosine kinase has been studied in depth, molecular mechanisms of how FLT3 expression is regulated at the post-transcriptional level in particular remain elusive. In this study, we investigated the roles of an RNA binding protein MSI2 as a regulator of FLT3 expression. MSI2 and FLT3 are significantly co-regulated in human AML and chronic myelogenous leukemia in blast crisis (BC-CML)...
January 11, 2017: Leukemia Research
https://www.readbyqxmd.com/read/28107683/altering-intra-to-inter-molecular-hydrogen-bonding-by-dimethylsulfoxide-a-tddft-study-of-charge-transfer-for-coumarin-343
#10
Xiaochun Liu, Hang Yin, Hui Li, Ying Shi
DFT and TDDFT methods were carried out to investigate the influences of intramolecular and intermolecular hydrogen bonding on excited state charge transfer for coumarin 343 (C343). Intramolecular hydrogen bonding is formed between carboxylic acid group and carbonyl group in C343 monomer. However, in dimethylsulfoxide (DMSO) solution, DMSO 'opens up' the intramolecular hydrogen bonding and forms solute-solvent intermolecular hydrogen bonded C343-DMSO complex. Analysis of frontier molecular orbitals reveals that intramolecular charge transfer (ICT) occurs in the first excited state both for C343 monomer and complex...
January 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28107675/a-novel-modal-independent-ultrasonic-motor-with-dual-stator
#11
Jian Liu, Jiamei Jin, Ruinan Ji, Di Chen
In this paper, a novel modal-independent ultrasonic motor with dual stator is proposed, in order to relieve the difficulty of adjustment for coincidence of modal frequencies of a stator for multi-modal coupling type ultrasonic motor (USM). It consists of two stators (an upper stator and a lower stator) and a rotor. The stators are excited the 3rd longitudinal vibration mode, by arranging the location of rotor and two stators, the rotor can realize rotary motion by friction effect with the stators. The rotor is mounted between the maximum deformation location of the upper stator and the nodal line of the lower stator...
January 10, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28107674/mitochondrial-serine-hydroxymethyltransferase-2-is-a-potential-diagnostic-and-prognostic-biomarker-for-human-glioma
#12
Bo Wang, Wei Wang, ZhiZhong Zhu, XueBin Zhang, Fan Tang, Dong Wang, Xi Liu, XiaoLing Yan, Hao Zhuang
OBJECTIVE: Scholars have gradually come to appreciate the relevance of serine and glycine metabolism. Recently, researchers have discovered that mitochondrial serine hydroxymethyltransferase 2 (SHMT2) is overexpressed in various types of cancer. However, the function of SHMT2 in glioma is not clear. In this study, we sought to examine the expression of SHMT2 in glioma, the association between SHMT2 expression and clinicopathological characteristics, and the association of SHMT2 expression with prognosis in glioma patients...
January 16, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28107672/a-computational-model-of-conditioning-inspired-by-drosophila-olfactory-system
#13
Faramarz Faghihi, Ahmed A Moustafa, Ralf Heinrich, Florentin Wörgötter
Recent studies have demonstrated that Drosophila melanogaster (briefly Drosophila) can successfully perform higher cognitive processes including second order olfactory conditioning. Understanding the neural mechanism of this behavior can help neuroscientists to unravel the principles of information processing in complex neural systems (e.g. the human brain) and to create efficient and robust robotic systems. In this work, we have developed a biologically-inspired spiking neural network which is able to execute both first and second order conditioning...
November 23, 2016: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28107669/medical-comorbidity-in-bipolar-disorder-the-link-with-metabolic-inflammatory-systems
#14
REVIEW
Ana SayuriYamagata, Elisa Brietzke, Joshua D Rosenblat, Ron Kakar, Roger S McIntyre
BACKGROUND: Bipolar disorder (BD) is associated with chronic low-grade inflammation, several medical comorbidities and a decreased life expectancy. Metabolic-inflammatory changes have been postulated as one of the main links between BD and medical comorbidity, although there are few studies exploring possible mechanisms underlying this relationship. Therefore, the aims of the current narrative review were 1) synthesize the evidence for metabolic-inflammatory changes that may facilitate the link between medical comorbidity and BD and 2) discuss therapeutic and preventive implications of these pathways...
January 4, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28107665/a-%C3%AF-%C3%AF-conjugation-containing-soft-and-conductive-injectable-polymer-hydrogel-highly-efficiently-rebuilds-cardiac-function-after-myocardial-infarction
#15
Rui Bao, Baoyu Tan, Shuang Liang, Ning Zhang, Wei Wang, Wenguang Liu
Previous studies suggested that a stiffer hydrogel system exhibited a better performance to promote heart function after myocardial infarction (MI). However, the nature of myocardium, a tissue that alternately contracts and relaxes with electrical impulses, leads us to hypothesize that a soft and conductive hydrogel may be in favor of mechanical and electrical signals transmission to enhance heart function after MI. In this work, π-π conjugation interaction was first employed to produce a soft injectable hydrogel with conductive property...
January 12, 2017: Biomaterials
https://www.readbyqxmd.com/read/28107664/safety-and-efficacy-of-cardiopoietic-stem-cells-in-the-treatment-of-post-infarction-left-ventricular-dysfunction-from-cardioprotection-to-functional-repair-in-a-translational-pig-infarction-model
#16
Maximilian Y Emmert, Petra Wolint, Andras Jakab, Sean P Sheehy, Francesco S Pasqualini, Thi Dan Linh Nguyen, Monika Hilbe, Burkhardt Seifert, Benedikt Weber, Chad E Brokopp, Dominika Macejovska, Etem Caliskan, Arnold von Eckardstein, Ruth Schwartlander, Viola Vogel, Volkmar Falk, Kevin Kit Parker, Mariann Gyöngyösi, Simon P Hoerstrup
To date, clinical success of cardiac cell-therapies remains limited. To enhance the cardioreparative properties of stem cells, the concept of lineage-specification through cardiopoietic-guidance has been recently suggested. However, so far, only results from murine studies and from a clinical pilot-trial in chronic heart-failure (CHF) are available, while systematic evidence of its therapeutic-efficacy is still lacking. Importantly, also no data from large animals or for other indications are available. Therefore, we here investigate the therapeutic-efficacy of human cardiopoietic stem cells in the treatment of post-infarction LV-dysfunction using a translational pig-model...
November 23, 2016: Biomaterials
https://www.readbyqxmd.com/read/28107655/discrimination-between-naphthacene-and-triphenylene-using-cellulose-tris-4-methylbenzoate-and-cellulose-tribenzoate-a-computational-study
#17
Yusuke Murakami, Tohru Shibata, Kazuyoshi Ueda
The mechanisms of naphthacene and triphenylene discrimination using commercially available cellulose tris(4-methylbenzoate) (CMB) and cellulose tribenzoate (CB) chiral stationary phases were investigated using molecular mechanics calculations. Naphthacene and triphenylene could be separated by liquid chromatography on CMB and CB, with triphenylene being eluted earlier than naphthacene on both phases. However, the corresponding separation factor is much larger for CMB than for CB. The docking of these polycyclic aromatic hydrocarbons to the above polymers suggested that the most important sites of CMB and CB for interacting with these hydrocarbons are located at equivalent positions, featuring a space surrounded by main chain glucose units and benzoyl side chains...
January 7, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/28107652/symbiont-derived-antimicrobials-contribute-to-the-control-of-the-lepidopteran-gut-microbiota
#18
Yongqi Shao, Bosheng Chen, Chao Sun, Keishi Ishida, Christian Hertweck, Wilhelm Boland
Insects develop efficient antimicrobial strategies to flourish in a bacterial world. It has long been proposed that native gut microbiota is an important component of host defense; however, the responsible species have rarely been isolated to elucidate the mechanism of action. Here we show that the dominant symbiotic bacterium Enterococcus mundtii associated with the generalist herbivore Spodoptera littoralis actively secretes a stable class IIa bacteriocin (mundticin KS) against invading bacteria, but not against other gut residents, facilitating the normal development of host gut microbiota...
January 19, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28107651/one-ring-to-fight-them-all-the-sulfazecin-story
#19
Daniel Braga, Gerald Lackner
In this issue of Cell Chemical Biology, Li et al. (2017) report on the biosynthesis of the monobactam sulfazecin by Pseudomonas acidophila and hypothesize a novel mechanism of β-lactam ring formation. As monobactam antibiotics are unaffected by some emerging resistance mechanisms (particularly metallo-β-lactamases), this discovery opens prospects to engineer β-lactam antibiotics against multi-drug resistant pathogens.
January 19, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28107643/does-psychological-well-being-change-following-treatment-an-exploratory-study-on-outpatients-with-eating-disorders
#20
Elena Tomba, Lucia Tecuta, Romana Schumann, Donatella Ballardini
Psychological well-being changes following cognitive-behavioral therapy-based treatment were investigated in outpatients with eating disorders (ED). While it is known that CBT reduces symptomatology in EDs, less is known about how changes in positive functioning may ensue. One-hundred and eighty five ED outpatients were analyzed for pre-treatment and post-treatment changes in psychological well-being (PWB) by last observation carried forward - Wilcoxon signed rank tests. Significant gains in all PWB dimensions were found, with moderate effect size correlations in environmental mastery (r=-...
January 7, 2017: Comprehensive Psychiatry
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