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https://www.readbyqxmd.com/read/29160072/solvent-controlled-branching-of-localized-versus-delocalized-singlet-exciton-states-and-equilibration-with-charge-transfer-in-a-structurally-well-defined-tetracene-dimer
#1
Jasper D Cook, Thomas J Carey, Dylan H Arias, Justin C Johnson, Niels H Damrauer
A detailed photophysical picture is elaborated for a structurally well-defined and symmetrical bis-tetracene dimer in solution. The molecule was designed for interrogation of the initial photophysical steps (S1 → (1)TT) in intramolecular singlet fission (SF). (Triisopropylsilyl)acetylene substituents on the dimer TIPS-BT1 as well as a monomer model TIPS-Tc enable a comparison of photophysical properties, including transient absorption dynamics, as solvent polarity is varied. In nonpolar toluene solutions, TIPS-BT1 decays via radiative and nonradiative pathways to the ground state with no evidence for dynamics related to the initial stages of SF...
November 21, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29160056/technique-tips-%C3%A2-repairing-fractured-metal-ceramic-restorations-using-tribochemical-impregnation
#2
F J T Burke
No abstract text is available yet for this article.
December 2016: Dental Update
https://www.readbyqxmd.com/read/29160002/a-randomized-double-blind-trial-of-needle-free-injected-lidocaine-versus-topical-anesthesia-for-infant-lumbar-puncture
#3
Ryan Caltagirone, Vidya R Raghavan, Kathleen Adelgais, Genie E Roosevelt
OBJECTIVES: Lumbar punctures (LPs) are commonly performed in febrile infants to evaluate for meningitis, and local anesthesia increases the likelihood of LP success. Traditional methods of local anesthesia require injection which may be painful or topical application which is not effective immediately. Recent advances in needle-free jet injection may offer a rapid alternative to these modalities. We compared a needle-free jet-injection system (J-Tip(™) ) with 1% buffered lidocaine to topical anesthetic (TA) cream for local anesthesia in infant LPs...
November 20, 2017: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/29156496/sensation-mechanoreceptor-and-nerve-fiber-function-after-nerve-regeneration
#4
Christian Krarup, Birgitta Rosén, Michel Boeckstyns, Allan Ibsen Sørensen, Göran Lundborg, Mihai Moldovan, Simon J Archibald
OBJECTIVE: Sensation is essential for recovery after peripheral nerve injury. However, the relationship between sensory modalities and function of regenerated fibers is uncertain. We have investigated the relationships between touch threshold, tactile gnosis and mechanoreceptor and sensory fiber function after nerve regeneration. METHODS: Twenty-one median or ulnar nerve lesions were repaired by a collagen nerve conduit or direct suture. Quantitative sensory hand function and sensory conduction studies by near-nerve technique including tactile stimulation of mechanoreceptors were followed for 2 years, and results were compared to non-injured hands...
November 20, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/29154015/albumin-bilirubin-grade-versus-meld-score-for-predicting-survival-after-transjugular-intrahepatic-portosystemic-shunt-tips-creation
#5
J Ronald, Q Wang, S S Choi, P V Suhocki, M D Hall, T P Smith, C Y Kim
OBJECTIVES: The purpose of this study was to compare the albumin-bilirubin (ALBI) grade and model for end-stage liver disease (MELD) scores for predicting survival after transjugular intrahepatic portosystemic shunt (TIPS) creation. MATERIALS AND METHODS: A retrospective study of pre-procedure ALBI and MELD scores was performed in 197 patients who underwent TIPS from 2005 to 2012. There were 140 men and 57 women, with a mean age of 56±11 (SD) (range: 19-90years)...
November 16, 2017: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/29147171/recent-progress-of-bypass-surgery-to-the-dialysis-dependent-patients-with-critical-limb-ischemia
#6
Nobuyoshi Azuma, Shinsuke Kikuchi, Hiroko Okuda, Keisuke Miyake, Atsuhiro Koya
According to expansion of dialysis-dependent population, more than half of patients with critical ischemic limbs are dialysis-dependent in Japan. Although patients with end-staged renal disease are well-known as poor life prognosis, well-managed dialysis patients in Japan can survive much longer compared to dialysis patients in the United States and Europe. Therefore, some dialysis patients can enjoy the long-term benefits of bypass surgery. To decide the indication of bypass surgery, patient's general condition, nutrition status, and vein availability are more important rather than arterial disease anatomy...
September 25, 2017: Annals of Vascular Diseases
https://www.readbyqxmd.com/read/29144837/evolution-of-alternative-adaptive-immune-systems-in-vertebrates
#7
Thomas Boehm, Masayuki Hirano, Stephen J Holland, Sabyasachi Das, Michael Schorpp, Max D Cooper
Adaptive immunity in jawless fishes is based on antigen recognition by three types of variable lymphocyte receptors (VLRs) composed of variable leucinerich repeats, which are differentially expressed by two T-like lymphocyte lineages and one B-like lymphocyte lineage. The T-like cells express either VLRAs or VLRCs of yet undefined antigen specificity, whereas the VLRB antibodies secreted by B-like cells bind proteinaceous and carbohydrate antigens. The incomplete VLR germline genes are assembled into functional units by a gene conversion-like mechanism that employs flanking variable leucine-rich repeat sequences as templates in association with lineage-specific expression of cytidine deaminases...
November 16, 2017: Annual Review of Immunology
https://www.readbyqxmd.com/read/29142136/size-composition-and-evolution-of-hiv-dna-populations-during-early-antiretroviral-therapy-and-intensification-with-maraviroc
#8
Antoine Chaillon, Sara Gianella, Steven M Lada, Josué Perez-Santiago, Parris Jordan, Caroline Ignacio, Maile Karris, Douglas Richman, Sanjay R Mehta, Susan J Little, Joel O Wertheim, Davey M Smith
Residual viremia is common during antiretroviral therapy (ART), and could be caused by ongoing low-level virus replication or by release of viral particles from infected cells. ART Intensification should impact ongoing viral propagation but not virion release. Eighteen acutely infected men were enrolled in a randomized controlled trial, and followed for a median of 107 weeks. Participants started ART with (n=9) or without (n=9) intensification with maraviroc (MVC) within 90 days of infection. Levels of HIV DNA and cell-free RNA were quantified by droplet digital PCR...
November 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29139285/subradiant-dipolar-interactions-in-plasmonic-nanoring-resonator-array-for-integrated-label-free-biosensing
#9
Yuzhang Liang, Hui Zhang, Wenqi Zhu, Amit Agrawal, Henri J Lezec, Lixia Li, Wei Peng, Yi Zou, Yan-Qing Lu, Ting Xu
With the development of advanced nanofabrication technologies over the last decade, plasmonic nanostructures have attracted wide attention for their potential in label-free biosensing applications. However, the sensing performance of nanostructured plasmonic sensors is primarily limited by the broad-linewidth features with low peak-to-dip signal ratio in the extinction spectra that result from strong radiative damping. Here, we propose and systematically investigate the in-plane and out-of-plane dipolar interactions in an array of plasmonic nanoring resonators that are from the spatial combination of classic nanohole and nanodisk structures...
November 15, 2017: ACS Sensors
https://www.readbyqxmd.com/read/29134623/repeated-evolution-and-reversibility-of-self-fertilization-in-the-volvocine-green-algae
#10
Erik R Hanschen, Matthew D Herron, John J Wiens, Hisayoshi Nozaki, Richard E Michod
Outcrossing and self-fertilization are fundamental strategies of sexual reproduction, each with different evolutionary costs and benefits. Self-fertilization is thought to be an evolutionary "dead-end" strategy, beneficial in the short term but costly in the long term, resulting in self-fertilizing species that occupy only the tips of phylogenetic trees. Here, we use volvocine green algae to investigate the evolution of self-fertilization. We use ancestral-state reconstructions to show that self-fertilization has repeatedly evolved from outcrossing ancestors and that multiple reversals from selfing to outcrossing have occurred...
November 14, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/29134094/the-evolution-of-giant-flightless-birds-and-novel-phylogenetic-relationships-for-extinct-fowl-aves-galloanseres
#11
Trevor H Worthy, Federico J Degrange, Warren D Handley, Michael S Y Lee
The extinct dromornithids, gastornithids and phorusrhacids are among the most spectacular birds to have ever lived, with some giants exceeding 500 kg. The affinities and evolution of these and other related extinct birds remain contentious, with previous phylogenetic analyses being affected by widespread convergence and limited taxon sampling. We address these problems using both parsimony and tip-dated Bayesian approaches on an expansive taxon set that includes all key extinct flightless and flighted (e...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29131835/no-evidence-of-critical-slowing-down-in-two-endangered-hawaiian-honeycreepers
#12
Jessica C Rozek, Richard J Camp, J Michael Reed
There is debate about the current population trends and predicted short-term fates of the endangered forest birds, Hawai`i Creeper (Loxops mana) and Hawai`i `Ākepa (L. coccineus). Using long-term population size estimates, some studies report forest bird populations as stable or increasing, while other studies report signs of population decline or impending extinction associated with introduced Japanese White-eye (Zosterops japonicus) increase. Reliable predictors of impending population collapse, well before the collapse begins, have been reported in simulations and microcosm experiments...
2017: PloS One
https://www.readbyqxmd.com/read/29129171/commentaries-and-clinical-tips-for-assessing-respiratory-diseases
#13
David J Barnes
No abstract text is available yet for this article.
November 20, 2017: Medical Journal of Australia
https://www.readbyqxmd.com/read/29129002/histological-characterization-of-passiflora-pohlii-mast-root-tips-cryopreserved-using-the-v-cryo-plate-technique
#14
Mariela J Simão, Myriam Collin, Renata O Garcia, Elisabeth Mansur, Georgia Pacheco, Florent Engelmann
Cryopreservation stands out as the main strategy to ensure safe and cost efficient long-term conservation of plant germplasm, especially for biotechnological materials. However, the injuries associated with the procedure may result in structural damage and low recovery rates after cooling. Histological analysis provides useful information on the effects of osmotic dehydration, LN exposure, and recovery conditions on cellular integrity and tissue organization, allowing the determination of the critical steps of the cryopreservation protocol and, thus, the use of optimized treatments...
November 12, 2017: Protoplasma
https://www.readbyqxmd.com/read/29127605/er-yag-laser-piezosurgery-and-surgical-drill-for-bone-decortication-during-orthodontic-mini-implant-insertion-primary-stability-analysis-an-animal-study
#15
Jacek Matys, Rafał Flieger, Gianluca Tenore, Kinga Grzech-Leśniak, Umberto Romeo, Marzena Dominiak
It is important to identify factors that affect primary stability of orthodontic mini-implants because it determines the success of treatment. We assessed mini-implant primary stability (initial mechanical engagement with the bone) placed in pig jaws. We also assessed mini-implant insertion failure rate (mini-implant fracture, mini-implants to root contact). A total of 80 taper-shaped mini-implants (Absoanchor® Model SH1312-6; Dentos Inc., Daegu, Korea) 6 mm long with a diameter of 1.1 mm were used. Bone decortication was made before mini-implant insertion by means of three different methods: Group G1: Er:YAG laser (LiteTouch®, Light Instruments, Yokneam, Israel) at energy of 300 mJ, frequency 25 Hz, fluence 38...
November 10, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29125915/a-pilot-study-investigating-reactive-oxygen-species-production-in-capillary-blood-after-a-marathon-and-the-influence-of-an-antioxidant-rich-beetroot-juice
#16
Tom Clifford, Amy Bowman, Tess Capper, Dean M Allerton, Emma Foster, Mark Birch-Machin, Georg Lietz, Glyn Howatson, Emma J Stevenson
We report that reactive oxygen species (ROS), as measured in capillary blood taken from the finger-tip, increased after a marathon (+128% P < 0.01; ES = 1.17), indicating that this collection method might be useful for measuring ROS in field settings. However, mitochondrial DNA damage remained unchanged. Beetroot juice, taken before and after exercise, was unable to mitigate exercise induced-ROS production, questioning its use an antioxidant rich-food.
November 10, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29122309/the-keys-to-successful-tips-in-patients-with-portal-vein-thrombosis-and-cavernous-transformation
#17
S Lombardo, J J Espejo, M E Pérez-Montilla, L J Zurera, Á González-Galilea
Portal vein thrombosis is a common complication in patients with cirrhosis. Anticoagulation involves a high risk of bleeding secondary to portal hypertension, so placing transjugular intrahepatic portosystemic shunts (TIPS) has become an alternative treatment for portal vein thrombosis. Three strategies for TIPS placement have been reported: 1) portal recanalization and conventional implantation of the TIPS through the jugular vein; 2) portal recanalization through percutaneous transhepatic/transsplenic) access; and (3) insertion of the TIPS between the suprahepatic vein and a periportal collateral vessel without portal recanalization...
November 6, 2017: Radiología
https://www.readbyqxmd.com/read/29119483/low-level-laser-therapy-for-xerostomia-in-primary-sj%C3%A3-gren-s-syndrome-a-randomized-trial
#18
Tania Fidelix, Adriano Czapkowski, Sergio Azjen, Adagmar Andriolo, Pedro Horvath Neto, Virgínia Trevisani
To evaluate the effectiveness of low-level laser therapy (LLLT) in the treatment of xerostomia in primary Sjögren's syndrome (SS), a randomized clinical trial of patients with dry mouth symptoms associated with primary SS receiving care at a university hospital was conducted. Sixty-six patients were randomly assigned with a 1:1 allocation ratio to receive LLLT (laser group, n = 33) or placebo treatment (placebo group, n = 33). Patients in the laser group received LLLT twice a week for 6 weeks, for a total of 12 treatment sessions...
November 9, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/29115948/evaluation-of-intravenous-regional-anaesthesia-and-four-point-nerve-block-efficacy-in-the-distal-hind-limb-of-dairy-cows
#19
S Yavari, N Khraim, G Szura, A Starke, E Engelke, C Pfarrer, K Hopster, M Schmicke, W Kehler, M Heppelmann, S B R Kästner, J Rehage
BACKGROUND: Intravenous regional anaesthesia (IVRA) and hindfoot four-point nerve block anaesthesia (NBA) are recommended for local anaesthesia (LA) in the distal limb of dairy cows. Two studies were conducted to compare the efficacy, time until onset and stress responses to IVRA and NBA in dairy cows. In the first cross-over designed study, eight healthy unsedated German Holstein cows, restrained in lateral recumbency (LR) on a surgical tipping table, were treated with IVRA and NBA using procaine 2% as a local anaesthetic...
November 7, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29112402/combined-falling-drop-open-port-sampling-interface-system-for-automated-flow-injection-mass-spectrometry
#20
Gary J Van Berkel, Vilmos Kertesz, Matt Orcutt, Adam Bentley, Jim Glick, Jimmy Flarakos
The aim of this work was to demonstrate and to evaluate the analytical performance of a combined falling drop/open port sampling interface (OPSI) system as a simple noncontact, no-carryover, automated system for flow injection analysis with mass spectrometry. The falling sample drops were introduced into the OPSI using a widely available autosampler platform utilizing low cost disposable pipet tips and conventional disposable microtiter well plates. The volume of the drops that fell onto the OPSI was in the 7-15 μL range with an injected sample volume of several hundred nanoliters...
November 7, 2017: Analytical Chemistry
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