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https://www.readbyqxmd.com/read/28822291/highly-absorbing-multispectral-near-infrared-polymer-nanoparticles-from-one-conjugated-backbone-for-photoacoustic-imaging-and-photothermal-therapy
#1
Haobin Chen, Jian Zhang, Kaiwen Chang, Xiaoju Men, Xiaofeng Fang, Libo Zhou, Dongliang Li, Duyang Gao, Shengyan Yin, Xuanjun Zhang, Zhen Yuan, Changfeng Wu
Semiconducting polymers with specific absorption are useful in various applications, including organic optoelectronics, optical imaging, and nanomedicine. However, the optical absorption of a semiconducting polymer with a determined structure is hardly tunable when compared with that of inorganic semiconductors. In this work, we show that the optical absorption of polymer nanoparticles from one conjugated backbone can be effectively tuned through judicious design of the particle morphology and the persistence length of polymers...
August 12, 2017: Biomaterials
https://www.readbyqxmd.com/read/28820897/persistent-infection-due-to-a-small-colony-variant-of-burkholderia-pseudomallei-leads-to-pd-1-upregulation-on-circulating-immune-cells-and-mononuclear-infiltration-in-viscera-of-experimental-balb-c-mice
#2
Jia-Xiang See, Samudi Chandramathi, Mahmood Ameen Abdulla, Jamuna Vadivelu, Esaki M Shankar
BACKGROUND: Melioidosis is a neglected tropical disease endemic across South East Asia and Northern Australia. The etiological agent, Burkholderia pseudomallei (B.pseudomallei), is a Gram-negative, rod-shaped, motile bacterium residing in the soil and muddy water across endemic regions of the tropical world. The bacterium is known to cause persistent infections by remaining latent within host cells for prolonged duration. Reactivation of the recrudescent disease often occurs in elders whose immunity wanes...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28817256/tailorable-exciton-transport-in-doped-peptide-amphiphile-assemblies
#3
Lee A Solomon, Matthew E Sykes, Yimin A Wu, Richard D Schaller, Gary P Wiederrecht, Harry Christopher Fry
Light-harvesting biomaterials are an attractive target in photovoltaics, photocatalysis, and artificial photosynthesis. Through peptide self-assembly, complex nanostructures can be engineered to study the role of chromophore organization during light absorption and energy transport. To this end, we demonstrate the one-dimensional transport of excitons along naturally occurring, light-harvesting, Zn-protoporphyrin IX chromophores within self-assembled peptide-amphiphile nanofibers. The internal structure of the nanofibers induces packing of the porphyrins into linear chains...
August 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28815237/induced-polarization-restricts-the-conformational-distribution-of-a-light-harvesting-molecular-triad-in-the-ground-state
#4
Oleg N Starovoytov, Pengzhi Zhang, Piotr Cieplak, Margaret S Cheung
The light-harvesting molecular triad consisting of carotenoid polyene (C), diaryl-porphyrin (P) and pyrrole-fullerene (C60) is a donor-acceptor molecule capable of absorbing incident light in the visible range. Its ability to convert solar energy to electrical excitation and charge separation energy suggests a great potential in real-world applications. The ensemble of its conformations under ambient conditions varies widely according to its electronic state. In previous work, we applied a non-polarizable model to study the conformational distribution of the molecular triad in the ground and charge separated states...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28814749/preparation-of-ch3nh3pbi3-thin-films-with-tens-of-micrometer-scale-at-high-temperature
#5
Hao Zhang, Mian Tao, Baizhi Gao, Wei Chen, Qi Li, Qingyu Xu, Shuai Dong
The fabrication of high-quality organic-inorganic hybrid halide perovskite layers is the key prerequisite for the realization of high efficient photon energy harvest and electric energy conversion in their related solar cells. In this article, we report a novel fabrication technique of CH3NH3PbI3 layers based on high temperature chemical vapor reaction. CH3NH3PbI3 layers have been prepared by the reaction of PbI2 films which were deposited by pulsed laser deposition, with CH3NH3I vapor at various temperatures from 160 °C to 210 °C...
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28813028/detection-methodologies-for-pathogen-and-toxins-a-review
#6
REVIEW
Md Eshrat E Alahi, Subhas Chandra Mukhopadhyay
Pathogen and toxin-contaminated foods and beverages are a major source of illnesses, even death, and have a significant economic impact worldwide. Human health is always under a potential threat, including from biological warfare, due to these dangerous pathogens. The agricultural and food production chain consists of many steps such as harvesting, handling, processing, packaging, storage, distribution, preparation, and consumption. Each step is susceptible to threats of environmental contamination or failure to safeguard the processes...
August 16, 2017: Sensors
https://www.readbyqxmd.com/read/28812075/evidence-for-coherent-mixing-of-excited-and-charge-transfer-states-in-the-major-plant-light-harvesting-antenna-lhcii
#7
Charusheela Ramanan, Marco Ferretti, Henny van Roon, Vladimir I Novoderezhkin, Rienk van Grondelle
LHCII, the major light harvesting antenna from plants, plays a dual role in photosynthesis. In low light it is a light-harvester, while in high light it is a quencher that protects the organism from photodamage. The switching mechanism between these two orthogonal conditions is mediated by protein dynamic disorder and photoprotective energy dissipation. The latter in particular is thought to occur in part via spectroscopically 'dark' states. We searched for such states in LHCII trimers from spinach, at both room temperature and at 77 K...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28810712/genomic-analysis-of-the-evolution-of-phototrophy-among-haloalkaliphilic-rhodobacterales
#8
Karel Kopejtka, Jürgen Tomasch, Yonghui Zeng, Martin Tichý, Dimitry Y Sorokin, Michal Koblížek
A characteristic feature of the order Rhodobacterales is the presence of a large number of photoautotrophic and photoheterotrophic species containing bacteriochlorophyll. Interestingly, these phototrophic species are phylogenetically mixed with chemotrophs. To better understand the origin of such variability, we sequenced the genomes of three closely related haloalkaliphilic species, differing in their phototrophic capacity and oxygen preference: the photoheterotrophic and facultatively anaerobic bacterium Rhodobaca barguzinensis, aerobic photoheterotroph Roseinatronobacter thiooxidans, and aerobic heterotrophic bacterium Natronohydrobacter thiooxidans...
July 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28809829/horizontal-whole-mount-a-novel-processing-and-imaging-protocol-for-thick-three-dimensional-tissue-cross-sections-of-skin
#9
Lucia Salz, Ryan R Driskell
Processing a tissue of interest to generate a microscopic image that supports a scientific argument can be challenging. The acquisition of high-quality microscopic images is not entirely dependent upon the quality of the microscope, but also upon the methods of tissue processing, which often involve multiple critical actions or steps. Furthermore, mesenchymal cell types in the skin and other tissues represent a new challenge for tissue preparation and imaging. Here, we present a complete process, from tissue harvest to microscopy...
August 2, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28808954/heavy-metal-pollutants-in-selected-organs-of-african-giant-rats-from-three-agro-ecological-zones-of-nigeria-evidence-for-their-role-as-an-environmental-specimen-bank
#10
Ifukibot Levi Usende, Benjamin O Emikpe, James Olukayode Olopade
An assessment of the concentration of heavy metals in the liver, brain, kidney, bone, and lungs of African giant rats (AGRs) from three agro-ecological zones of Nigeria having different industrial activities was carried out using atomic absorption spectrophotometer. Twenty adult AGRs from cities in mangrove/freshwater swamp, rainforest, and woodland/tall grass savanna agro-ecological zones of Nigeria were used for this study. AGRs were euthanized, carefully dissected, and the brains, liver, lungs, bone, and kidneys were harvested, digested, and analyzed for concentrations of vanadium (V), lead (Pb), cadmium (Cd), zinc (Zn), selenium (Se), copper (Cu), and iron (Fe)...
August 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28808031/changes-in-aggregation-states-of-light-harvesting-complexes-as-a-mechanism-for-modulating-energy-transfer-in-desert-crust-cyanobacteria
#11
Leeat Bar Eyal, Reza Ranjbar Choubeh, Eyal Cohen, Ido Eisenberg, Carmen Tamburu, Márta Dorogi, Renata Ünnep, Marie-Sousai Appavou, Reinat Nevo, Uri Raviv, Ziv Reich, Győző Garab, Herbert van Amerongen, Yossi Paltiel, Nir Keren
In this paper we propose an energy dissipation mechanism that is completely reliant on changes in the aggregation state of the phycobilisome light-harvesting antenna components. All photosynthetic organisms regulate the efficiency of excitation energy transfer (EET) to fit light energy supply to biochemical demands. Not many do this to the extent required of desert crust cyanobacteria. Following predawn dew deposition, they harvest light energy with maximum efficiency until desiccating in the early morning hours...
August 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28806559/assessment-of-chemicals-released-in-the-marine-environment-by-dielectric-elastomers-useful-as-active-elements-in-wave-energy-harvesters
#12
Mirela-Fernanda Zaltariov, Adrian Bele, Lavinia Vasiliu, Luiza Gradinaru, Nicoleta Vornicu, Carmen Racles, Maria Cazacu
A series of elastomers, either natural or synthetic (some of them commercial, while others prepared in the laboratory), suitable for use as active elements in devices for wave energy harvesting, were evaluated concerning their behavior and effects on the marine environment. In this aim, the elastomer films, initially evaluated regarding their aspect, structure, surface wettability, and tolerance of microorganisms growth, were immersed in synthetic seawater (SSW) within six months for assessing compounds released...
August 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28805925/evaluation-of-the-prevalence-of-digital-dermatitis-and-the-effects-on-performance-in-beef-feedlot-cattle-under-organic-trace-mineral-supplementation
#13
M Kulow, P Merkatoris, K S Anklam, J Rieman, C Larson, M Branine, D Döpfer
Bovine digital dermatitis (DD) is a contagious and multifactorial disease that leads to painful, ulcerative lesions of the skin near the heel-horn border of the foot, most commonly in dairy cattle. With regard to beef cattle, the pathogenesis and etiology of DD has not been widely reported or studied over the past several decades. A longitudinal field trial in a commercial feedlot was conducted to compare prevalence and effects of DD in beef steers provided a diet supplemented with a novel formulation of inorganic and organic trace mineral sources (OTM diet) compared to a diet provided with similar levels of trace minerals solely from inorganic sources (CON diet)...
August 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28805864/novel-synthesis-of-magnetic-porous-c-znfe2o4-photocatalyst-with-enhanced-activity-under-visible-light-based-on-the-fenton-like-reaction
#14
Fangxiao Wang, Yanglin Chen, Rongshu Zhu, Jianmin Sun
Magnetic visible-light-driven photocatalyst, porous C/ZnFe2O4 (denoted as C/ZFO-CE) was fabricated via a CO2-mediated ethanol route. CO2-mediated ethanol route largely mitigated the solvent strength and facilitated the homogenous deposition of ZnFe2O4 (ZFO) through the coordination of metallic cation with CO3(2-) and HCO3(-) anions, which were hydrolyzed from CO2 and H2O, thereby avoiding additional precipitant. Moreover, the HCO3(-), CO3(2-) and NO3(-) in the system acted as templates for the formation of porous C avoiding the additional organic mesoporous templates, thus reducing the synthesis cost...
August 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28804552/in-vivo-opening-of-the-mitochondrial-permeability-transition-pore-in-a-rat-model-of-ventricular-fibrillation-and-closed-chest-resuscitation
#15
Iyad M Ayoub, Jeejabai Radhakrishnan, Raúl J Gazmuri
Opening of the mitochondrial permeability transition pore (mPTP) is considered central to reperfusion injury. Yet, most of our knowledge comes from observations in isolated mitochondria, cells, and organs. We used a rat model of ventricular fibrillation (VF) and closed-chest resuscitation to examine whether the mPTP opens in vivo and whether cyclosporine A (CsA) attenuates the associated myocardial injury. Two series of 26 and 18 rats each underwent 10 minutes of untreated VF before attempting resuscitation...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28803190/legacy-and-new-halogenated-persistent-organic-pollutants-in-polar-bears-from-a-contamination-hotspot-in-the-arctic-hudson-bay-canada
#16
R J Letcher, A D Morris, M Dyck, E Sverko, E J Reiner, D A D Blair, S G Chu, L Shen
A large and complex suite of 295 legacy and new halogenated persistent organic pollutants (POPs) were investigated in fat or liver tissue samples of polar bears collected in 2013-2014 from Southern (SHB) and Western (WHB) subpopulations of the Canadian Arctic contaminants hotspot of Hudson Bay. A total of 210 POPs were detected and/or quantifiable with some frequency in all fat or liver samples. POP profile and concentration differences were investigated both within (e.g. age and sex) and between the two subpopulations...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28801519/xor-inhibition-with-febuxostat-accelerates-pulmonary-endothelial-barrier-recovery-and-improves-survival-in-lipopolysaccharide-induced-murine-sepsis
#17
Mahendra Damarla, Laura F Johnston, Gigi Liu, Li Gao, Lan Wang, Lidenys Varela, Todd M Kolb, Bo S Kim, Rachel L Damico, Paul M Hassoun
Sepsis is a leading cause of death among patients in the intensive care unit, resulting from multi-organ failure. Activity of xanthine oxidoreductase (XOR), a reactive oxygen species (ROS) producing enzyme, is known to be elevated in nonsurvivors of sepsis compared to survivors. We have previously demonstrated that XOR is critical for ventilator-induced lung injury. Using febuxostat, a novel nonpurine inhibitor of XOR, we sought to determine the role of XOR inhibition in a murine model of sepsis-induced lung injury and mortality...
August 2017: Physiological Reports
https://www.readbyqxmd.com/read/28799772/optoelectronic-properties-of-semiconductor-quantum-dot-solids-for-photovoltaic-applications
#18
Alexander A Chistyakov, Mariya A Zvaigzne, Vladimir R Nikitenko, Alexey R Tameev, Igor L Martynov, Oleg V Prezhdo
Quantum dot (QD) solids represents a new type of condensed matter that is highly relevant from both fundamental and applied points of view. The properties of QD solids are qualitatively different from those of the traditional solids, and their unique characteristics give rise to promising applications. The combination of quantum confinement in individual QDs with macroscopic scale of the whole material leads to novel features of electronic excitations (excitons) and charge transfer processes, which are of great interest for optoelectronic applications...
August 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28797944/siderophore-mediated-iron-removal-from-chrysotile-implications-for-asbestos-toxicity-reduction-and-bioremediation
#19
Sanjay K Mohanty, Cedric Gonneau, Ashkan Salamatipour, Ralph A Pietrofesa, Brenda Casper, Melpo Christofidou-Solomidou, Jane K Willenbring
Asbestos fibers are highly toxic (Group 1 carcinogen) due to their high aspect ratio, durability, and the presence of iron. In nature, plants, fungi, and microorganisms release exudates, which can alter the physical and chemical properties of soil minerals including asbestos minerals. We examined whether exudates from bacteria and fungi at environmentally relevant concentrations can alter chrysotile, the most widely used asbestos mineral, and lower its toxicity. We monitored the release of iron from chrysotile in the presence of organic acid ligands and iron-specific siderophores derived from bacteria and fungi and measured any change in fiber toxicity toward peritoneal macrophages harvested from mice...
July 22, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28796661/fms-like-tyrosine-kinase-3-ligand-attenuates-local-and-systemic-infection-in-a-model-of-post-burn-pneumonia
#20
Gabriel Hundeshagen, Weihua Cui, Lindsay Musgrove, Aaron Cherry, Seung-Jin Lee, Robert A Cox, Tracy Toliver-Kinsky
BACKGROUND: Burn injury induces immunosuppression and promotes infection with opportunistic pathogens. Pneumonia and sepsis are leading causes of post-burn morbidity and mortality. Fms-like tyrosine kinase-3 ligand (Flt3L) improves local and systemic resistance to P. aeruginosa-associated burn wound infection. This study evaluates the effects of post-burn prophylactic Flt3L treatment on local and systemic infection and inflammation in a murine model of pneumonia and sepsis. METHODS: Mice received a severe scald burn, were treated with Flt3L or vehicle (CTR) for 5 days and inoculated trans-nasally with P...
August 7, 2017: Shock
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