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https://www.readbyqxmd.com/read/28935692/probing-structure-function-relationships-in-early-events-in-photosynthesis-using-a-chimeric-photocomplex
#1
Kenji V P Nagashima, Mai Sasaki, Kanako Hashimoto, Shinichi Takaichi, Sakiko Nagashima, Long-Jiang Yu, Yuto Abe, Kenta Gotou, Tomoaki Kawakami, Mizuki Takenouchi, Yuuta Shibuya, Akira Yamaguchi, Takashi Ohno, Jian-Ren Shen, Kazuhito Inoue, Michael T Madigan, Yukihiro Kimura, Zheng-Yu Wang-Otomo
The native core light-harvesting complex (LH1) from the thermophilic purple phototrophic bacterium Thermochromatium tepidum requires Ca(2+) for its thermal stability and characteristic absorption maximum at 915 nm. To explore the role of specific amino acid residues of the LH1 polypeptides in Ca-binding behavior, we constructed a genetic system for heterologously expressing the Tch. tepidum LH1 complex in an engineered Rhodobacter sphaeroides mutant strain. This system contained a chimeric pufBALM gene cluster (pufBA from Tch...
September 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28935267/methylphenidate-doses-in-attention-deficit-hyperactivity-disorder-and-comorbid-substance-use-disorders
#2
Charlotte Skoglund, Lena Brandt, Brian D'Onofrio, Henrik Larsson, Johan Franck
Patients with Attention Deficit/Hyperactivity Disorder (ADHD) and comorbid Substance Use Disorders (SUD) are increasingly being treated with central stimulant medication despite limited evidence for its effectiveness. Lack of longitudinal follow-up studies of dosing and adverse effects has resulted in conflicting treatment guidelines. This study aims to explore whether individuals with ADHD and comorbid SUD are treated with higher stimulant doses than individuals with ADHD only, and whether doses increase over time as a sign of tolerance, a core symptom of addiction...
September 18, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28934610/chitosan-lipid-nanoparticles-cs-lnps-application-to-sirna-delivery
#3
Özgül Tezgel, Anna Szarpak-Jankowska, Amandine Arnould, Rachel Auzély-Velty, Isabelle Texier
To benefit from the biocompatibility of lipid nanoparticles associated with the transfection ability of chitosan, small chitosan lipid nanoparticles (CS-LNPs) dedicated to SiRNA delivery were formulated by an easy-to-implement one-step process. Formulations of CS-LNPs (lipid core stabilized by a shell comprising phospholipids/cationic lipids and hydrophobically modified chitosan) were optimized for their physico-chemical properties (size, zeta potential, colloidal stability) according to their shell composition...
September 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28934215/tracing-the-temporal-stability-of-autism-spectrum-diagnosis-and-severity-as-measured-by-the-autism-diagnostic-observation-schedule-a-systematic-review-and-meta-analysis
#4
Łucja Bieleninik, Maj-Britt Posserud, Monika Geretsegger, Grace Thompson, Cochavit Elefant, Christian Gold
BACKGROUND: Exploring ways to improve the trajectory and symptoms of autism spectrum disorder is prevalent in research, but less is known about the natural prognosis of autism spectrum disorder and course of symptoms. The objective of this study was to examine the temporal stability of autism spectrum disorder and autism diagnosis, and the longitudinal trajectories of autism core symptom severity. We furthermore sought to identify possible predictors for change. METHODS: We searched PubMed, PsycInfo, EMBASE, Web of Science, Cochrane Library up to October 2015 for prospective cohort studies addressing the autism spectrum disorder/autism diagnostic stability, and prospective studies of intervention effects...
2017: PloS One
https://www.readbyqxmd.com/read/28933868/electronic-structure-and-stability-of-b12x12-2-x-f-at-a-combined-photoelectron-spectroscopic-and-theoretical-study
#5
Jonas Warneke, Gao-Lei Hou, Edoardo Aprà, Carsten Jenne, Zheng Yang, Zhengbo Qin, Karol Kowalski, Xue-Bin Wang, Sotiris S Xantheas
The stability and electron loss process of numerous Multiply Charged Anions (MCAs) have been traditionally explained in terms of the classical Coulomb interaction between spatially separated charged groups. An understanding of these processes in MCAs with not well-separated excess charges is still lacking. We report the surprising properties and physical behavior of [B12X12]2-, X = F, Cl, Br, I, At, which are MCAs with not well-separated excess charges and cannot be described by the prevailing classical picture...
September 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28932447/crystal-structure-of-hexa-methyl-4-4-4-4-4-4-1-3-5-2%C3%AE-5-4%C3%AE-5-6%C3%AE-5-tri-aza-triphosphinine-2-2-4-4-6-6-hexa-yl-hexa-kis-oxy-hexa-benzoate
#6
Jing Zhu, Guo Hui Hou, Qian Li, Fu Wei Zheng, Hong Liang Wei, Hui Juan Chu, Gang Wang, Juan He, Ling Bo Qu
The title compound, C48H42N3O18P3, achieved in a two-step synthesis, comprises a cyclo-triphosphazene core and six 4-meth-oxy-carbonyl-phen-oxy groups. Each P atom is attached to two substituents located up and down with respect to the plane of the phosphazene ring, the central P3N3 ring having a twist-boat conformation. The three O/P/O planes and five of the six benzene rings are nearly perpendicular to the mean plane through the phosphazene ring [dihedral angles = 82.98 (8)-88.92 (8)°], while the remaining benzene ring forms a dihedral angle of 25...
July 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28931861/flexible-bio-memristive-devices-based-on-chicken-egg-albumen-au-sio2-core-shell-nanoparticle-nanocomposites
#7
Chang Han Bok, Sung Jun Woo, Chaoxing Wu, Jae Hyeon Park, Tae Whan Kim
Flexible bio-memristive (FBM) devices utilizing chicken egg albumen (CEA):Au@SiO2 core-shell nanoparticle nanocomposites were fabricated on indium-tin-oxide (ITO) coated polyethylene naphthalate (PEN) substrates. Current-voltage (I-V) curves for the Al/CEA:Au@SiO2 core-shell nanoparticle/ITO/PEN devices showed clockwise current hysteresis behaviors due to the existence of the CEA:Au@SiO2 core-shell nanoparticle nanocomposites. The endurance number of the ON/OFF switching for the FBM devices was above 10(2) cycles...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931738/biological-and-statistical-processes-jointly-drive-population-aggregation-using-host-parasite-interactions-to-understand-taylor-s-power-law
#8
Pieter T J Johnson, Mark Q Wilber
The macroecological pattern known as Taylor's power law (TPL) represents the pervasive tendency of the variance in population density to increase as a power function of the mean. Despite empirical illustrations in systems ranging from viruses to vertebrates, the biological significance of this relationship continues to be debated. Here we combined collection of a unique dataset involving 11 987 amphibian hosts and 332 684 trematode parasites with experimental measurements of core epidemiological outcomes to explicitly test the contributions of hypothesized biological processes in driving aggregation...
September 27, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28930197/red-blood-cell-eicosapentaenoic-acid-inversely-relates-to-mri-assessed-carotid-plaque-lipid-core-burden-in-elders-at-high-cardiovascular-risk
#9
Núria Bargalló, Rosa Gilabert, Edwin-Saúl Romero-Mamani, Montserrat Cofán, Philip C Calder, Montserrat Fitó, Dolores Corella, Jordi Salas-Salvadó, Miguel Ruiz-Canela, Ramon Estruch, Emilio Ros, Aleix Sala-Vila
Supplemental marine omega-3 eicosapentaenoic acid (EPA) has an anti-atherosclerotic effect. Clinical research on EPA supplied by the regular diet and atherosclerosis is scarce. In the framework of the PREvención con DIeta MEDiterránea (PREDIMED) trial, we conducted a cross-sectional study in 161 older individuals at high vascular risk grouped into different stages of carotid atherosclerosis severity, including those without ultrasound-detected atheroma plaque (n = 38), with plaques <2.0 mm thick (n = 65), and with plaques ≥2...
September 20, 2017: Nutrients
https://www.readbyqxmd.com/read/28926998/a-new-hydrogen-sensor-based-on-sns-fiber-interferometer-with-pd-wo%C3%A2-coating
#10
Jinxin Shao, Wenge Xie, Xi Song, Yanan Zhang
This paper presents a new hydrogen sensor based on a single mode-no core-single mode (SNS) fiber interferometer structure. The surface of the no core fiber (NCF) was coated by Pd/WO₃ film to detect the variation of hydrogen concentration. If the hydrogen concentration changes, the refractive index of the Pd/WO₃ film as well as the boundary condition for light propagating in the NCF will all be changed, which will then cause a shift into the resonant wavelength of interferometer. Therefore, the hydrogen concentration can be deduced by measuring the shift of the resonant wavelength...
September 18, 2017: Sensors
https://www.readbyqxmd.com/read/28925263/partially-reversible-photo-induced-chemical-changes-in-a-mixed-ion-perovskite-material-for-solar-cells
#11
Ute B Cappel, Sebastian Svanström, Valeria Lanzilotto, Fredrik Oskar Lars Johansson, Kerttu Aitola, Bertrand Philippe, Erika Giangrisostomi, Ruslan Ovsyannikov, Torsten Leitner, Alexander Foehlisch, Svante Svensson, Nils Mårtensson, Gerrit Boschloo, Andreas Lindblad, Håkan Rensmo
Metal halide perovskites have emerged as materials of high interest for solar energy to electricity conversion and in particular the use of mixed ion structures has led to high power conversion efficiencies and improved stability. For this reason, it is important develop means to obtain atomic level understanding of the photo-induced behaviour of these materials including processes such as photo-induced phase separation and ion migration. In this paper, we implement a new methodology combining visible laser illumination of a mixed-ion perovskite ((FAPbI3)0...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28925020/one-pot-synthesis-of-size-controllable-core-shell-cds-and-derivative-cds-znxcd1-xs-structures-for-dramatic-photocatalytic-hydrogen-production
#12
Shuangshuang Kai, Baojuan Xi, Yifeng Wang, Shenglin Xiong
Chalcogenide micro/nano composite structures have been attracting world-wide attention due to the enormous prospect of applications in photocatalytic hydrogen production. Well-defined micro/nanostructures, featured with predominant properties, are of extraordinary importance. Herein, we reported a facile one-pot method on synthesis of monodispersed size-controllable CdS and CdS@ZnxCd1-xS core-shell submicrospheres, which were engineered with respect to the structural conformation and size. CdS core-shell submicrospheres with different size were selectively prepared for the first time...
September 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28924948/magnetic-nanoparticles-for-the-delivery-of-dapagliflozin-to-hypoxic-tumors-physicochemical-characterization-and-cell-studies
#13
Athina Angelopoulou, Efstathia Voulgari, Argiris Kolokithas-Ntoukas, Aristides Bakandritsos, Konstantinos Avgoustakis
In solid tumors, hypoxia (lack of oxygen) is developed, which leads to the development of resistance of tumor cells to chemotherapy and radiotherapy through various mechanisms. Nevertheless, hypoxic cells are particularly vulnerable when glycolysis is inhibited. For this reason, in this study, the development of magnetically targetable nanocarriers of the sodium-glucose transporter protein (SGLT2) inhibitor dapagliflozin (DAPA) was developed for the selective delivery of DAPA in tumors. This nanomedicine in combination with radiotherapy or chemotherapy should be useful for effective treatment of hypoxic tumors...
September 18, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28922606/three-dimensional-nico2o4-mnmoo4-core-shell-nanoarrays-for-high-performance-asymmetric-supercapacitors
#14
Yuliang Yuan, Weicheng Wang, Jie Yang, Haichao Tang, Zhizhen Ye, Yujia Zeng, Jianguo Lu
Design of new materials with sophisticated nanostructure has been proven to be an efficient strategy to improve their properties in many applications. Herein, we demonstrate the successful combination of high electron conductive materials of NiCo2O4 with the high capacitance materials of MnMoO4 by forming a core-shell nanostructure. The NiCo2O4@MnMoO4 core-shell nanoarrays (CSNAs) electrode possesses high specific capacitance of 4.24 F cm-2 at a current density of 5 mA cm-2, obviously larger than the pristine NiCo2O4 electrode...
September 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28921970/tris-heteroleptic-iridium-complexes-based-on-cyclometalated-ligands-with-different-cores
#15
Yanouk Cudré, Felipe Franco de Carvalho, Gregory R Burgess, Louise Male, Simon J A Pope, Ivano Tavernelli, Etienne Baranoff
A series of tris-heteroleptic iridium complexes of the form [Ir(C^N(1))(C^N(2))(acac)] combining 2-phenylpyridine (ppy), 2-(2,4-difluorophenyl)pyridine (dFppy), 1-phenylpyrazole (ppz), and 1-(2,4-difluorophenyl)pyrazole (dFppz) as the C^N ligands have been synthesized and fully characterized by NMR, X-ray crystallography, UV-vis absorption and emission spectroscopy, and electrochemical methods. It is shown that "static properties" (e.g., absorption and emission spectra and redox potentials) are primarily dictated by the overall architecture of the complex, while "dynamic properties" (e...
September 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28921543/language-growth-in-children-with-heterogeneous-language-disorders-a-population-study
#16
Courtenay Frazier Norbury, George Vamvakas, Debbie Gooch, Gillian Baird, Tony Charman, Emily Simonoff, Andrew Pickles
BACKGROUND: Language development has been characterised by significant individual stability from school entry. However, the extent to which trajectories of language growth vary in children with language disorder as a function of co-occurring developmental challenges is a question of theoretical import, with implications for service provision. METHODS: SCALES employed a population-based survey design with sample weighting procedures to estimate growth in core language skills over the first three years of school...
October 2017: Journal of Child Psychology and Psychiatry, and Allied Disciplines
https://www.readbyqxmd.com/read/28920961/germline-mutations-affecting-the-histone-h4-core-cause-a-developmental-syndrome-by-altering-dna-damage-response-and-cell-cycle-control
#17
Federico Tessadori, Jacques C Giltay, Jane A Hurst, Maarten P Massink, Karen Duran, Harmjan R Vos, Robert M van Es, Richard H Scott, Koen L I van Gassen, Jeroen Bakkers, Gijs van Haaften
Covalent modifications of histones have an established role as chromatin effectors, as they control processes such as DNA replication and transcription, and repair or regulate nucleosomal structure. Loss of modifications on histone N tails, whether due to mutations in genes belonging to histone-modifying complexes or mutations directly affecting the histone tails, causes developmental disorders or has a role in tumorigenesis. More recently, modifications affecting the globular histone core have been uncovered as being crucial for DNA repair, pluripotency and oncogenesis...
September 18, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28919979/reversal-of-fibrosis-in-patients-with-nonalcoholic-steatohepatosis-after-gastric-bypass-surgery
#18
Brian M Parker, Jiang Wu, Jing You, David S Barnes, Lisa Yerian, John P Kirwan, Philip R Schauer, Daniel I Sessler
BACKGROUND: Roux-en-Y gastric bypass (RYGB) improves the pathophysiology that contributes to obesity-related nonalcoholic steatohepatitis (NASH). Whether obesity-related fibrosis improves is unclear. We hypothesized that RYGB reverses NASH and fibrosis, and indocyanine green (ICG) clearance provides a sensitive measure for detecting asymptomatic fatty liver disease. METHODS: One hundred six obese adults scheduled for RYGB had preoperative liver function assessed using standard tests and ICG clearance and core liver biopsies obtained during RYGB...
2017: BMC Obesity
https://www.readbyqxmd.com/read/28919525/gelatin-stabilization-of-quantum-dots-for-improved-stability-and-biocompatibility
#19
Sundararajan Parani, Kannaiyan Pandian, Oluwatobi Samuel Oluwafemi
We herein report an aqueous synthesis of gelatin stabilized CdTe/CdS/ZnS (CSSG) core/double shell quantum dots (QDs) with improved biocompatibility. The as-synthesized QDs were characterized by ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopic techniques, x-ray diffraction technique (XRD), x-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The CSSG QDs revealed high photoluminescence quantum yield (PLQY) with excellent stability over a period of one year and retained 90% of its initial PLQY without any aggregation or precipitation under ambient condition...
September 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28919098/temporal-regulation-of-%C3%AF-b-by-partner-switching-mechanism-at-a-distinct-growth-stage-in-bacillus-cereus
#20
Jung-Chi Chen, Chuan-Fu Chang, Duen-Wei Hsu, Jwu-Ching Shu, Hong-Yi Chen, Chien-Yen Chen, Chi-Yu Lu, Chien-Cheng Chen
The alternative transcription factor σ(B) in Bacillus cereus governs the transcription of a number of genes that confer protection against general stress. This transcription factor is regulated by protein-protein interactions among RsbV, RsbW, σ(B), RsbY, RsbM and RsbK, all encoded in the sigB cluster. Among these regulatory proteins, RsbV, RsbW and σ(B) comprise a partner-switching mechanism. Under normal conditions, σ(B) remains inactive by associating with anti-sigma factor RsbW, which prevents σ(B) from binding to the core RNA polymerase...
September 5, 2017: International Journal of Medical Microbiology: IJMM
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