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https://www.readbyqxmd.com/read/28437993/integrated-optical-force-sensors-using-focusing-photonic-crystal-arrays
#1
Jingkun Guo, Richard A Norte, S Gröblacher
Mechanical oscillators are at the heart of many sensor applications. Recently several groups have developed oscillators that are probed optically, fabricated from high-stress silicon nitride films. They exhibit outstanding force sensitivities of a few aN/Hz<sup>1/2</sup> and can also be made highly reflective, for efficient detection. The optical read-out usually requires complex experimental setups, including positioning stages and bulky cavities, making them impractical for real applications. In this paper we propose a novel way of building fully integrated all-optical force sensors based on low-loss silicon nitride mechanical resonators with a photonic crystal reflector...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437950/maximum-likelihood-sequence-estimation-for-optical-complex-direct-modulation
#2
Di Che, Feng Yuan, William Shieh
Semiconductor lasers are versatile optical transmitters in nature. Through the direct modulation (DM), the intensity modulation is realized by the linear mapping between the injection current and the light power, while various angle modulations are enabled by the frequency chirp. Limited by the direct detection, DM lasers used to be exploited only as 1-D (intensity or angle) transmitters by suppressing or simply ignoring the other modulation. Nevertheless, through the digital coherent detection, simultaneous intensity and angle modulations (namely, 2-D complex DM, CDM) can be realized by a single laser diode...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437922/from-toes-to-top-of-atmosphere-fowler-s-sneaker-depth-index-of-water-clarity-for-the-chesapeake-bay
#3
Benjamin Crooke, Lachlan I W McKinna, Ivona Cetinić
Fowler's Sneaker Depth (FSD), analogous to the well known Secchi disk depth (Zsd), is a visually discerned citizen scientist metric used to assess water clarity in the Patuxent River estuary. In this study, a simple remote sensing algorithm was developed to derive FSD from space-borne spectroradiometric imagery. An empirical model was formed that estimates FSD from red-end remote sensing reflectances at 645 nm, Rrs(645). The model is based on a hyperbolic function relating water clarity to Rrs(645) that was established using radiative transfer modeling and fine tuned using in-water FSD measurements and coincident Rrs(645) data observed by NASA's Moderate Resolution Imaging Spectroradiometer aboard the Aqua spacecraft (MODISA)...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437771/solvent-bar-micro-extraction-sbme-based-determination-of-pahs-in-seawater-samples
#4
José A López-López, Esther Ogalla-Chozas, Pablo A Lara-Martín, Marina G Pintado-Herrera
Measuring the impact of PAHs in seawater samples is often difficult due to the low concentrations in which they appear and the complexity of the sample matrix. Traditional methods for sample preparation such as liquid-liquid extraction and solid phase extraction require the use of excessive amounts of solvents and reagents, and sample handling. In this work, hollow fiber liquid phase micro-extraction (HFLPME), in the configuration of solvent bar micro-extraction (SBME), was proposed as an environmentally friendly and more effective tool, for the extraction of the 16 priority PAHs from seawater samples...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28437740/stabilization-of-metal-loid-s-in-two-contaminated-agricultural-soils-comparing-biochar-to-its-non-pyrolysed-source-material
#5
Lukáš Trakal, Irene Raya-Moreno, Kerry Mitchell, Luke Beesley
Two metal(loid) contaminated agricultural soils were amended with grape stalk (wine production by-product)-derived biochar as well as its pre-pyrolysed origin material, to investigate their geochemical impacts on As, Cr, Cu and Zn. Detailed physico-chemical evaluation combined with a column leaching test determined the retention of metal(loid)s from soil solution by each amendments. A pot experiment measured metal(loid)s in soil pore water and their uptake to ryegrass when the amendments were mixed into soils at 1 and 5% (w/w)...
April 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28437693/an-assessment-of-the-social-cognitive-predictors-of-exclusive-breastfeeding-behavior-using-the-health-action-process-approach
#6
J L Martinez-Brockman, F M Shebl, N Harari, R Pérez-Escamilla
RATIONALE: In the United States rates of exclusive breastfeeding duration remain exceedingly low. Exclusive breastfeeding is a complex learned behavior that is influenced by social cognitive, interpersonal, and structural factors. Interventions are needed that address factors at multiple levels of the social-ecological model. This study was designed to examine the social cognitive predictors of exclusive breastfeeding behavior in a sample of low-income women attending the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) breastfeeding peer counseling program and enrolled in the Lactation Advice Through Texting Can Help (LATCH) study...
April 12, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28437687/use-of-tourmaline-as-a-potential-petrogenetic-indicator-in-the-determination-of-host-magma-crs-xrd-and-ped-xrf-methods
#7
Bahattin Gullu, Yusuf Kagan Kadioglu
Tourmaline defines a group of complex borosilicate forms as accessory mineral in igneous and metamorphic rocks and they act an important role in the interpretation of the chemical composition changes of the composition of the host fluid of the magma. The variety of tourmaline can be identified by using optical microscopy, X-Ray Diffraction (XRD) and by determining its chemical composition through Polarized Energy Dispersive X-Ray Fluorescence (PED-XRF) methods. However, microscopic investigations and XRD analyses are not quite adequate for detailed determination of tourmaline sub-groups...
April 19, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28437504/effect-of-plate-in-close-proximity-to-empty-external-fixation-pin-site-on-long-bone-torsional-strength
#8
Fred L Speck, Randal P Morris, Ronald W Lindsey
Complex tibia fractures are often provisionally stabilized with external fixation prior to definitive fracture fixation. Bicortical defects, such as those left after removal of a fixator pin, can decrease the torsional strength of long bone. Evaluating the effect of subsequent plate fixation in close proximity to a defect on the torsional strength of the tibia is the purpose of this study. Eight groups of 5 fourth-generation left composite tibias were tested to failure in torsion. The experimental plated groups consisted of bicortical defects at 3 cm, 2 cm, and 1 cm distal to the plate end, with 1 plated group without a defect...
March 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/28437479/conformational-dynamics-of-bacterial-trigger-factor-in-apo-and-ribosome-bound-states
#9
Mehmet Tarik Can, Zeynep Kurkcuoglu, Gokce Ezeroglu, Arzu Uyar, Ozge Kurkcuoglu, Pemra Doruker
The chaperone trigger factor (TF) binds to the ribosome exit tunnel and helps cotranslational folding of nascent chains (NC) in bacterial cells and chloroplasts. In this study, we aim to investigate the functional dynamics of fully-atomistic apo TF and its complex with 50S. As TF accomodates a high percentage of charged residues on its surface, the effect of ionic strength on TF dynamics is assessed here by performing five independent molecular dynamics (MD) simulations (total of 1.3 micro-second duration) at 29 mM and 150 mM ionic strengths...
2017: PloS One
https://www.readbyqxmd.com/read/28437395/global-survey-of-the-immunomodulatory-potential-of-common-drugs
#10
Gregory I Vladimer, Berend Snijder, Nikolaus Krall, Johannes W Bigenzahn, Kilian V M Huber, Charles-Hugues Lardeau, Kumar Sanjiv, Anna Ringler, Ulrika Warpman Berglund, Monika Sabler, Oscar Lopez de la Fuente, Paul Knöbl, Stefan Kubicek, Thomas Helleday, Ulrich Jäger, Giulio Superti-Furga
Small-molecule drugs may complement antibody-based therapies in an immune-oncology setting, yet systematic methods for the identification and characterization of the immunomodulatory properties of these entities are lacking. We surveyed the immumomodulatory potential of 1,402 small chemical molecules, as defined by their ability to alter the cell-cell interactions among peripheral mononuclear leukocytes ex vivo, using automated microscopy and population-wide single-cell image analysis. Unexpectedly, ∼10% of the agents tested affected these cell-cell interactions differentially...
April 24, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28437376/organizational-issues-structure-and-processes-of-care-in-257-icus-in-latin-america-a-study-from-the-latin-america-intensive-care-network
#11
Elisa Estenssoro, Leyla Alegría, Gastón Murias, Gilberto Friedman, Ricardo Castro, Nicolas Nin Vaeza, Cecilia Loudet, Alejandro Bruhn, Manuel Jibaja, Gustavo Ospina-Tascon, Fernando Ríos, Flavia R Machado, Alexandre Biasi Cavalcanti, Arnaldo Dubin, F Javier Hurtado, Arturo Briva, Carlos Romero, Guillermo Bugedo, Jan Bakker, Maurizio Cecconi, Luciano Azevedo, Glenn Hernandez
OBJECTIVE: Latin America bears an important burden of critical care disease, yet the information about it is scarce. Our objective was to describe structure, organization, processes of care, and research activities in Latin-American ICUs. DESIGN: Web-based survey submitted to ICU directors. SETTINGS: ICUs located in nine Latin-American countries. SUBJECTS: Individual ICUs. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Two hundred fifty-seven of 498 (52%) of submitted surveys responded: 51% from Brazil, 17% Chile, 13% Argentina, 6% Ecuador, 5% Uruguay, 3% Colombia, and 5% between Mexico, Peru, and Paraguay...
April 21, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28437337/axial-plane-deformity-of-the-shoulder-in-adolescent-idiopathic-scoliosis
#12
Venugopal K Menon, Naveen Tahasildar, Haroon M Pillay, Anbuselvam M
STUDY DESIGN: Prospective observational study. OBJECTIVE: To study axial plane deformation of the shoulder in adolescent idiopathic scoliosis (AIS) and try to correlate it with curve type and surgical correction. SUMMARY OF BACKGROUND DATA: It is established that AIS is a 3-dimensional deformity. The rib hump is the most common manifestation of axial plane deformations; the least common manifestation seems to be upper trunk and shoulder rotation, which has been hitherto undescribed...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28437228/first-case-of-ndm-1-producing-klebsiella-pneumoniae-in-annaba-university-hospital-algeria
#13
Amel Abderrahim, Nassima Djahmi, Charlotte Pujol, Sabina Nedjai, Mohamed Cherif Bentakouk, Djamila Kirane-Gacemi, Mazouz Dekhil, Albert Sotto, Jean-Philippe Lavigne, Alix Pantel
AIM: The aim of this study was to characterize two carbapenem-resistant Klebsiella pneumoniae isolates recovered from urine samples in a patient hospitalized at Annaba University hospital (Algeria) in 2014. RESULTS: Two K. pneumoniae isolates were studied because they proved resistant to almost all antibiotics tested with a high level resistance to ertapenem (minimum inhibitory concentration = 32 mg/L). The results of modified Hodge test and combined disk test (ROSCO Diagnostica, Taastrup, Denmark) were positive...
February 22, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28437219/factors-affecting-sexual-function-in-midlife-women-results-from-the-midlife-women-s-health-study
#14
Rebecca L Smith, Lisa Gallicchio, Jodi A Flaws
OBJECTIVE: The objective of this study was to estimate the importance of risk factors affecting sexual function in sexually active midlife women. MATERIALS AND METHODS: A cohort of 780 women undergoing the menopausal transition was surveyed each year for up to 7 years. Data were collected from sexually active women on sexual function, including frequencies of enjoyment, arousal, orgasm, passion for partner, satisfaction with partner, pain, lack of lubrication, fantasizing, and sexual activity...
February 28, 2017: Journal of Women's Health
https://www.readbyqxmd.com/read/28437103/ion-pair-oligomerization-of-chromogenic-triangulenium-cations-with-cyanostar-modified-anions-that-controls-emission-in-hierarchical-materials
#15
Bo Qiao, Brandon E Hirsch, Semin Lee, Maren Pink, Chun-Hsing Chen, Bo W Laursen, Amar H Flood
The hierarchical assembly of colored cationic molecules with receptor-modified counteranions can be used to control optical properties in materials. However, our knowledge of when the optical properties emerge in the hierarchical organization and the variety of cation-anion salts that are available to create these materials is limited. In this work, we extend the salts from small halides to large inorganic anions and determine how the structure coevolves with the emission properties using solution assemblies...
April 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28437102/insights-into-the-complex-photophysics-and-photochemistry-of-the-simplest-nitroaromatic-compound-a-caspt2-casscf-study-on-nitrobenzene
#16
Angelo Giussani, Graham A Worth
Nitrobenzene is the simplest nitroaromatic compound and yet is characterized by a challenging and rich photophysics and photochemistry. In the present contribution the main decay paths undertaken by the system after UV absorption from both the brightest 1(La*) and the lowest 1(nA*) singlet excited states have been characterized by means of CASPT2//CASSCF computations. The obtained results match with the main photophysical properties experimentally reported: the lack of fluorescence and phosphorescence emission is justified by the presence of accessible conical intersections and intersystem crossing regions between respectively the 1(nA*) and 3(nA*) states with the ground state, while the high triplet quantum yield is attributable to the strong coupling between the 1(nA*) and 3(O*) states along the main decay path of the former...
April 24, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28437101/ground-state-and-excited-state-tuning-in-ferric-dipyrrin-complexes-promoted-by-ancillary-ligand-exchange
#17
Claudia Kleinlein, Shao-Liang Zheng, Theodore A Betley
Three ferric dipyrromethene complexes featuring different ancillary ligands were synthesized by one electron oxidation of ferrous precursors. Four-coordinate iron complexes of the type ((Ar)L)FeX2 [(Ar)L = 1,9-(2,4,6-Ph3C6H2)2-5-mesityldipyrromethene] with X = Cl or (t)BuO were prepared and found to be high-spin (S = (5)/2), as determined by superconducting quantum interference device magnetometry, electron paramagnetic resonance, and (57)Fe Mössbauer spectroscopy. The ancillary ligand substitution was found to affect both ground state and excited properties of the ferric complexes examined...
April 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28437075/fluorescent-photoswitchable-diarylethenes-for-biolabeling-and-single-molecule-localization-microscopies-with-optical-superresolution
#18
Benoit Roubinet, Michael Weber, Heydar Shojaei, Mark Bates, Mariano L Bossi, Vladimir N Belov, Masahiro Irie, Stefan W Hell
A modular assembly of water soluble diarylethenes (DAEs), applicable as bio-markers for optical nanoscopy, is reported. Reversibly photoswitchable 1,2-bis(2-alkyl-6-phenyl-1-benzothiophene-1,1-dioxide-3-yl)perfluorocyclopentenes possessing a fluorescent "closed" form were decorated with one or two methoxy group(s) attached to the para-position(s) of phenyl ring(s) and two, four or eight carboxylic acid groups. Antibody conjugates of these DAEs feature low aggregation, efficient photoswitching in aqueous buffers, specific staining of cellular structures and photophysical properties (high emission efficiencies and low cycloreversion quantum yields) enabling their application in superresolution microscopy...
April 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28437072/the-single-disulfide-directed-%C3%AE-hairpin-fold-dynamics-stability-and-engineering
#19
Balasubramanyam Chittoor, Krishnarjuna Bankala, Rodrigo A W Morales, Christopher Andrew MacRaild, Maiada Sadek, Eleanor Ww Leung, Samuel Robinson, Michael Pennington, Raymond S Norton
Grafting bioactive peptide sequences onto small cysteine-rich scaffolds is a promising strategy to enhance their stability and value in novel peptide-based therapeutics. However, correctly folded disulfide-rich peptides can be challenging to produce by either recombinant or synthetic means. The single disulfide-directed β-hairpin (SDH) fold, first observed in contryphan-Vc1, provides a potential alternative to complex disulfide-rich scaffolds. We have undertaken recombinant production of full-length contryphan-Vc1 (rCon-Vc1[Z1Q]) and a truncated analog (rCon-Vc11-22[Z1Q]), analyzed the backbone dynamics of rCon-Vc1[Z1Q], and probed the conformational and proteolytic stability of these peptides to evaluate the potential of contryphan-Vc1 as a molecular scaffold...
April 24, 2017: Biochemistry
https://www.readbyqxmd.com/read/28436967/microtubule-minus-end-regulation-at-spindle-poles-by-an-aspm-katanin-complex
#20
Kai Jiang, Lenka Rezabkova, Shasha Hua, Qingyang Liu, Guido Capitani, A F Maarten Altelaar, Albert J R Heck, Richard A Kammerer, Michel O Steinmetz, Anna Akhmanova
ASPM (known as Asp in fly and ASPM-1 in worm) is a microcephaly-associated protein family that regulates spindle architecture, but the underlying mechanism is poorly understood. Here, we show that ASPM forms a complex with another protein linked to microcephaly, the microtubule-severing ATPase katanin. ASPM and katanin localize to spindle poles in a mutually dependent manner and regulate spindle flux. X-ray crystallography revealed that the heterodimer formed by the N- and C-terminal domains of the katanin subunits p60 and p80, respectively, binds conserved motifs in ASPM...
April 24, 2017: Nature Cell Biology
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