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https://www.readbyqxmd.com/read/28346893/biochemical-transformation-of-lignin-for-deriving-valued-commodities-from-lignocellulose
#1
REVIEW
Daniel L Gall, John Ralph, Timothy J Donohue, Daniel R Noguera
The biochemical properties of lignin present major obstacles to deriving societally beneficial entities from lignocellulosic biomass, an abundant and renewable feedstock. Similar to other biopolymers such as polysaccharides, polypeptides, and ribonucleic acids, lignin polymers are derived from multiple types of monomeric units. However, lignin's renowned recalcitrance is largely attributable to its racemic nature and the variety of covalent inter-unit linkages through which its aromatic monomers are linked...
March 24, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28346789/resolving-ultrafast-photoinduced-deactivations-in-water-solvated-pyrimidine-nucleosides
#2
Ana J Pepino, Javier Segarra-Martí, Artur Nenov, Roberto Improta, Marco Garavelli
For the first time, ultrafast deactivations of photo-excited water-solvated pyrimidine nucleosides are mapped employing hybrid QM(CASPT2)/MM(AMBER) optimizations that account for explicit solvation, sugar effects and dynamically correlated potential energy surfaces. Low energy S1/S0 ring-puckering and ring-opening conical intersections (CIs) are suggested to drive the ballistic coherent sub-ps (<200fs) decays observed in each pyrimidine, the energetics controlling this processes correlating with the lifetimes observed...
March 27, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28346097/an-optimized-3d-coculture-assay-for-preclinical-testing-of-pro-and-antiangiogenic-drugs
#3
Daniela Unterleuthner, Nina Kramer, Karoline Pudelko, Alexandra Burian, Markus Hengstschläger, Helmut Dolznig
Angiogenesis is a promising target for anticancer therapies, but also for treating other diseases with pathologic vessel development. Targeting the vascular endothelial growth factor (VEGF) pathway did not proof as effective as expected due to emerging intrinsic resistance mechanisms, as well as stromal contributions leading to drug insensitivity. Therefore, alternative strategies affecting the interaction of endothelial cells (ECs) with other stromal cells seem to be more promising. Human preclinical in vitro angiogenesis models successfully recapitulating these interactions are rare, and two-dimensional (2D) cell cultures cannot mimic tissue architecture in vivo...
January 1, 2017: SLAS Discov
https://www.readbyqxmd.com/read/28345595/fundamental-properties-of-resonances
#4
S Ceci, M Hadžimehmedović, H Osmanović, A Percan, B Zauner
All resonances, from hydrogen nuclei excited by the high-energy gamma rays in deep space to newly discovered particles produced in Large Hadron Collider, should be described by the same fundamental physical quantities. However, two distinct sets of properties are used to describe resonances: the pole parameters (complex pole position and residue) and the Breit-Wigner parameters (mass, width, and branching fractions). There is an ongoing decades-old debate on which one of them should be abandoned. In this study of nucleon resonances appearing in the elastic pion-nucleon scattering we discover an intricate interplay of the parameters from both sets, and realize that neither set is completely independent or fundamental on its own...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28345593/microstructural-tissue-engineering-in-the-rachis-and-barbs-of-bird-feathers
#5
Theagarten Lingham-Soliar
Feathers do not have to be especially strong but they do need to be stiff and at the same time resilient and to have a high work of fracture. Syncitial barbule fibres are the highest size-class of continuous filaments in the cortex of the rachis of the feather. However, the rachis can be treated as a generalized cone of rapidly diminishing volume. This means that hundreds of syncitial barbule fibres of the rachis may have to be terminated before reaching the tip - creating potentially thousands of inherently fatal crack-like defects...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28345547/contrast-dose-and-radiation-dose-reduction-in-abdominal-enhanced-computerized-tomography-scans-with-single-phase-dual-energy-spectral-computerized-tomography-mode-for-children-with-solid-tumors
#6
Tong Yu, Jun Gao, Zhi-Min Liu, Qi-Feng Zhang, Yong Liu, Ling Jiang, Yun Peng
BACKGROUND: Contrast dose and radiation dose reduction in computerized tomography (CT) scan for adult has been explored successfully, but there have been few studies on the application of low-concentration contrast in pediatric abdominal CT examinations. This was a feasibility study on the use of dual-energy spectral imaging and adaptive statistical iterative reconstruction (ASiR) for the reduction of radiation dose and iodine contrast dose in pediatric abdominal CT patients with solid tumors...
April 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28345517/ptosis-and-vertical-diplopia-after-ligation-of-ethmoidal-arteries
#7
A Kahn, L Laccourreye, H D Fournier, C Brecheteau
The treatment of epistaxis is well codified, ligation of the ethmoidal arteries being the last resort. We report the case of a 25-year-old pregnant patient, who has had a ligation of the anterior and posterior ethmoidal arteries after a persistent epistaxis. Postoperatively, she presented a complete ptosis and an impaired eye elevation without any visual acuity disorders, evoking a lesion of the upper branch of the common oculomotor nerve (third cranial nerve). The patient totally recovered after 3 months...
February 21, 2017: J Stomatol Oral Maxillofac Surg
https://www.readbyqxmd.com/read/28345516/a-case-of-bilateral-megaducts-diagnostic-and-treatment-methods
#8
L Vatin, J M Foletti, C Collet, A Varoquaux, C Chossegros
INTRODUCTION: The pathology of the saliva glands comprises both tumoral and obstructive disorders. The latter include lithiasis, stenosis and megaduct. In this paper, we describe a clinical case of bilateral megaduct, a rare pathology, using sialo-MRI imaging and a conservative diagnostic-cum-therapeutic technique, sialendoscopy with dilation followed by catheterization. CLINICAL CASE: Our female patient presented oversized parotids with an unsightly deformation of the face (parotid ducts visible beneath the skin) and itchy cheeks, from which she had suffered for several years...
February 17, 2017: J Stomatol Oral Maxillofac Surg
https://www.readbyqxmd.com/read/28345376/lessons-from-metabonomics-on-the-neurobiology-of-stroke
#9
Mahim I Qureshi, Panagiotis A Vorkas, Alexander P Coupland, I Harri Jenkins, Elaine Holmes, Alun H Davies
The application of metabonomic science to interrogate stroke permits the study of metabolite entities, small enough to cross the blood-brain barrier, that provide insight into neuronal dysfunction, and may serve as reservoirs of biomarker discovery. This systematic review examines the applicability of metabolic profiling in ischemic stroke research. Six human studies utilizing metabolic profiling to analyze biofluids from ischemic stroke patients have been included, employing (1)H-NMR and/or mass spectrometry to analyze plasma, serum, and/or urine in a targeted or untargeted fashion...
October 1, 2016: Neuroscientist: a Review Journal Bringing Neurobiology, Neurology and Psychiatry
https://www.readbyqxmd.com/read/28345361/implant-of-permanent-pacemaker-during-acute-coronary-syndrome-mortality-and-associated-factors-in-the-ariam-registry
#10
María Dolores Pola-Gallego-de-Guzmán, Manuel Ruiz-Bailén, Maria-Angeles Martínez-Arcos, Artur Gómez-Blizniak, Ana-Maria Castillo Rivera, Jesus Cobo Molinos
BACKGROUND: Patients with acute coronary syndrome complicated with high degree atrioventricular block still have a high mortality. A low percentage of these patients need a permanent pacemaker (PPM) but mortality and associated factors with the PPM implant in acute coronary syndrome patients are not known. We assess whether PPM implant is an independent variable in the mortality of acute coronary syndrome patients. Also, we explored the variables that remain independently associated with PPM implantation...
March 1, 2017: European Heart Journal. Acute Cardiovascular Care
https://www.readbyqxmd.com/read/28345123/traumatic-pseudoaneurysms-of-the-head-in-war-time-report-of-two-unusual-cases
#11
Tayfun Hakan, Ahmet Cemil Kaur
Either intracranial or extracranial pseudoaneurysms due to penetrating head injuries with gunshot are very rare entities. As the pseudoaneurysms of the superficial temporal artery are represented commonly with a pulsating mass lesion beneath scalp, the intracranial pseudoaneurysms are represented with symptoms including decreased conscious level, seizure, or focal neurological deficits. Here, two patients with combat related pseudoaneurysms are reported; one was in distal cortical branch of anterior cerebral artery and one was in superficial temporal artery...
February 27, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/28345111/prenatal-ultrasonic-diagnosis-and-differential-diagnosis-of-isolated-right-aortic-arch-with-mirror-image-branching
#12
Junxue Gao, Jiaan Zhu, Qiuyan Pei, Jianguo Li
PURPOSE: This study sought to evaluate the fetal echocardiography features of isolated right aortic arch (RAA) with mirror-image branching and to improve the rate and accuracy of prenatal diagnosis of this condition. METHODS: We reviewed fetal echocardiograms from all cases of isolated RAA with mirror-image branching diagnosed at our institution between August 2012 and December 2015 and classified these cases into normal and abnormal types of ductus arteriosus based on the course of the arterial duct arch...
March 27, 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28344657/well-positioned-nucleosomes-punctuate-polycistronic-pol-ii-transcription-units-and-flank-silent-vsg-gene-arrays-in-trypanosoma-brucei
#13
Johannes Petrus Maree, Megan Lindsay Povelones, David Johannes Clark, Gloria Rudenko, Hugh-George Patterton
BACKGROUND: The compaction of DNA in chromatin in eukaryotes allowed the expansion of genome size and coincided with significant evolutionary diversification. However, chromatin generally represses DNA function, and mechanisms coevolved to regulate chromatin structure and its impact on DNA. This included the selection of specific nucleosome positions to modulate accessibility to the DNA molecule. Trypanosoma brucei, a member of the Excavates supergroup, falls in an ancient evolutionary branch of eukaryotes and provides valuable insight into the organization of chromatin in early genomes...
2017: Epigenetics & Chromatin
https://www.readbyqxmd.com/read/28344623/should-we-implant-a-permanent-pacemaker-in-patients-with-left-bundle-branch-block-and-pq-prolongation-following-transcatheter-aortic-valve-implantation
#14
Krzysztof Błaszyk, Anna Komosa, Marek Grygier, Anna Olasińska-Wiśniewska, Aleksander Araszkiewicz, Maciej Lesiak
No abstract text is available yet for this article.
2017: Postępy W Kardiologii Interwencyjnej, Advances in Interventional Cardiology
https://www.readbyqxmd.com/read/28344588/atlsg1-2-regulates-leaf-growth-by-affecting-cell-proliferation-and-the-onset-of-endoreduplication-and-synergistically-interacts-with-atnmd3-during-cell-proliferation-process
#15
Huayan Zhao, Shiyou Lü, Liming Xiong
AtLSG1-2 is a circularly permuted GTPase required for ribosome biogenesis and recently shown to be involved in early leaf development, although it was unclear how AtLSG1-2 affects leaf growth. Here, we found that atlsg1-2 mutants had reduced leaf size as a result of decreased cell size and cell number. Leaf kinematic analysis and CYCB1;1::GUS expression pattern in atlsg1-2 mutant indicated that loss of function of AtLSG1-2 delays the transition from cell division to cell expansion. Decreases in ploidy levels and trichome branch number suggest that AtLSG1-2 deficiency suppresses endoreduplication...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28344576/genomic-characterization-of-recent-chicken-anemia-virus-isolates-in-china
#16
Yang Li, Lichun Fang, Shuai Cui, Jiayuan Fu, Xiaohan Li, Huanmin Zhang, Zhizhong Cui, Shuang Chang, Weifeng Shi, Peng Zhao
Chicken anemia virus (CAV) causes diseases in young chickens, which include increased pathogenicity of secondary infectious agents, generalized lymphoid depletion, and immunodepression. In the present study, we have identified 22 CAV strains isolated from several commercial chicken farms in Northern China during 2014-2015. In addition, two CAVs were also isolated from stray mouse and dog feces, respectively. To our knowledge, this is the first report of identification of CAV from mouse and dog feces. Phylogenetic analysis of 121 full-length CAV genome sequences showed that all available CAV could be classified into eight lineages, supported by phylogenetic trees estimated using different methods...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28344555/drug-repurposing-of-the-anthelmintic-niclosamide-to-treat-multidrug-resistant-leukemia
#17
Sami Hamdoun, Philipp Jung, Thomas Efferth
Multidrug resistance, a major problem that leads to failure of anticancer chemotherapy, requires the development of new drugs. Repurposing of established drugs is a promising approach for overcoming this problem. An example of such drugs is niclosamide, a known anthelmintic that is now known to be cytotoxic and cytostatic against cancer cells. In this study, niclosamide showed varying activity against different cancer cell lines. It revealed better activity against hematological cancer cell lines CCRF-CEM, CEM/ADR5000, and RPMI-8226 compared to the solid tumor cell lines MDA-MB-231, A549, and HT-29...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28344392/seasonal-population-dynamics-of-sargassum-fusiforme-fucales-phaeophyta-suo-oshima-is-seto-inland-sea-japan-development-processes-of-a-stand-characterized-by-high-density-and-productivity
#18
Goro Yoshida, Hiromori Shimabukuro
Seasonal population dynamics of Sargassum fusiforme, one of the most important edible macroalgae in Japan, were studied. Recruits were mainly generated by vegetative reproduction at the margins of filamentous holdfasts. They first appeared in late spring and peaked in summer as upright thalli of the previous generation withered. After producing recruits, holdfasts withered indicating that holdfasts were also annual, the same as upright thalli. All recruits produced main branches and became new upright thalli in early autumn...
2017: Journal of Applied Phycology
https://www.readbyqxmd.com/read/28344344/detecting-truly-clonal-alterations-from-multi-region-profiling-of-tumours
#19
Benjamin Werner, Arne Traulsen, Andrea Sottoriva, David Dingli
Modern cancer therapies aim at targeting tumour-specific alterations, such as mutations or neo-antigens, and maximal treatment efficacy requires that targeted alterations are present in all tumour cells. Currently, treatment decisions are based on one or a few samples per tumour, creating uncertainty on whether alterations found in those samples are actually present in all tumour cells. The probability of classifying clonal versus sub-clonal alterations from multi-region profiling of tumours depends on the earliest phylogenetic branching event during tumour growth...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28344217/left-ventricular-twist-was-decreased-in-isolated-left-bundle-branch-block-with-preserved-ejection-fraction
#20
Sabiye Yılmaz, Harun Kılıc, Mustafa Tarık Ağac, Nurgül Keser, Efe Edem, Saadet Demirtaş, Mehmet Bülent Vatan, Ramazan Akdemir, Hüseyin Gündüz
OBJECTIVE: Left ventricular (LV) rotation and twist play an important role in LV contraction and relaxation. Left bundle branch block (LBBB) deteriorates both diastolic and systolic functions. We evaluated the LV twist in patients with LBBB and preserved ejection fraction (EF) (>50%) to determine twist as a potential marker for subtle myocardial dysfunction. METHODS: This observational cross-sectional study included 34 LBBB patients with preserved EF who were free from ischemic and valvular disease (Group 1) and 36 healthy controls (Group 2)...
March 22, 2017: Anatolian Journal of Cardiology
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