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https://www.readbyqxmd.com/read/28221697/solution-processable-hyperbranched-conjugated-polymer-nanoparticles-based-on-c3h-symmetric-benzotrithiophene-for-polymer-solar-cells
#1
Xiaofu Wu, Zijian Zhang, Hao Hang, Yonghong Chen, Yuxiang Xu, Hui Tong, Lixiang Wang
The development of photovoltaic polymers based on C3h -symmetric benzotrithiophene (C3h -BTT), an analogue of the well-known benzodithiophene (BDT) donor unit, has been severely limited due to difficult processability. Here the authors report the preparation of solution-processable C3h -BTT-based hyperbranched conjugated polymer nanoparticles (BTT-HCPNs) with tunable particle sizes via Stille miniemulsion polymerization. Compared with the corresponding star-shaped small molecule (C3h -BTT core with three diketopyrrolopyrrole arms, BTT-3DPP) with a wide bandgap (1...
February 21, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28220035/case-report-modified-laparoscopic-subtotal-cholecystectomy-an-alternative-approach-to-the-difficult-gallbladder
#2
Michael S Segal, Richard H Huynh, George O Wright
BACKGROUND Laparoscopic cholecystectomy is a commonly performed surgical procedure. In certain situations visualization of the Callot triangle can become difficult due to inflammation, adhesions, and sclerosing of the anatomy. Without being able to obtain the "critical view of safety" (CVS), there is increased risk of damage to vital structures. An alternative approach to the conventional conversion to an open cholecystectomy (OC) would be a laparoscopic subtotal cholecystectomy (LSC). CASE REPORT We present a case of a 56-year-old male patient with acute cholecystitis with a "difficult gallbladder" managed with LSC...
February 21, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28220022/using-metaphors-to-explain-molecular-testing-to-cancer-patients
#3
Ana P M Pinheiro, Rachel H Pocock, Margie D Dixon, Walid L Shaib, Suresh S Ramalingam, Rebecca D Pentz
BACKGROUND: Molecular testing to identify targetable molecular alterations is routine practice for several types of cancer. Explaining the underlying molecular concepts can be difficult, and metaphors historically have been used in medicine to provide a common language between physicians and patients. Although previous studies have highlighted the use and effectiveness of metaphors to help explain germline genetic concepts to the general public, this study is the first to describe the use of metaphors to explain molecular testing to cancer patients in the clinical setting...
February 20, 2017: Oncologist
https://www.readbyqxmd.com/read/28209949/-surgical-treatment-of-retroperitoneal-masses
#4
A G Kriger, S V Berelavichus, A I Son, D S Gorin, E A Akhtanin, A R Kaldarov, A V Smirnov, P I Davydenko, D V Kalinin
AIM: To improve the results of treatment of patients with retroperitoneal tumors. MATERIAL AND METHODS: The study included 83 patients with retroperitoneal tumors including 57 cases of benign tumors and 26 patients with malignancies. Laparotomy (Lt), robot-assisted (RA) and laparoscopic (Ls) techniques were used in 35, 34 and 14 patients respectively. Median tumor sizes in the largest dimension were 102 mm, 75 mm and 81.5 mm in Lt, RA and Ls groups respectively...
2017: Khirurgiia
https://www.readbyqxmd.com/read/28206744/alkane-oxidation-methane-monooxygenases-related-enzymes-and-their-biomimetics
#5
Vincent C-C Wang, Suman Maji, Peter P-Y Chen, Hung Kay Lee, Steve S-F Yu, Sunney I Chan
Methane monooxygenases (MMOs) mediate the facile conversion of methane into methanol in methanotrophic bacteria with high efficiency under ambient conditions. Because the selective oxidation of methane is extremely challenging, there is considerable interest in understanding how these enzymes carry out this difficult chemistry. The impetus of these efforts is to learn from the microbes to develop a biomimetic catalyst to accomplish the same chemical transformation. Here, we review the progress made over the past two to three decades toward delineating the structures and functions of the catalytic sites in two MMOs: soluble methane monooxygenase (sMMO) and particulate methane monooxygenase (pMMO)...
February 16, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28203355/who-is-the-usual-suspect-evidence-of-a-selection-bias-toward-faces-that-make-direct-eye-contact-in-a-lineup-task
#6
Jessica Taubert, Celine van Golde, Frans A J Verstraten
The speed and ease with which we recognize the faces of our friends and family members belies the difficulty we have recognizing less familiar individuals. Nonetheless, overconfidence in our ability to recognize faces has carried over into various aspects of our legal system; for instance, eyewitness identification serves a critical role in criminal proceedings. For this reason, understanding the perceptual and psychological processes that underlie false identification is of the utmost importance. Gaze direction is a salient social signal and direct eye contact, in particular, is thought to capture attention...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28196389/conversion-of-external-percutaneous-transhepatic-biliary-drainage-to-endoscopic-ultrasound-guided-hepaticogastrostomy-after-failed-standard-internal-stenting-for-malignant-biliary-obstruction
#7
Woo Hyun Paik, Nah Kyum Lee, Yousuke Nakai, Hiroyuki Isayama, Dongwook Oh, Tae Jun Song, Sang Soo Lee, Dong-Wan Seo, Sung Koo Lee, Myung-Hwan Kim, Do Hyun Park
Background and study aim Percutaneous transhepatic biliary drainage (PTBD) is a rescue procedure after a failed endoscopic retrograde cholangiopancreatography. As PTBD causes patient discomfort, conversion of the PTBD to internal biliary stenting (PTBDS) may be required; however, PTBDS is sometimes difficult because of the tight stricture. We evaluated the efficacy and safety of conversion of external PTBD to endoscopic ultrasound-guided hepaticogastrostomy (EUS-HGS) after failed PTBDS. Patients and methods A total of 16 patients with malignant distal biliary obstruction who underwent conversion of external PTBD to EUS-HGS after failed PTBDS were enrolled from two institutions in Korea and Japan...
February 14, 2017: Endoscopy
https://www.readbyqxmd.com/read/28196070/differential-paralog-divergence-modulates-genome-evolution-across-yeast-species
#8
Monica R Sanchez, Aaron W Miller, Ivan Liachko, Anna B Sunshine, Bryony Lynch, Mei Huang, Erica Alcantara, Christopher G DeSevo, Dave A Pai, Cheryl M Tucker, Margaret L Hoang, Maitreya J Dunham
Evolutionary outcomes depend not only on the selective forces acting upon a species, but also on the genetic background. However, large timescales and uncertain historical selection pressures can make it difficult to discern such important background differences between species. Experimental evolution is one tool to compare evolutionary potential of known genotypes in a controlled environment. Here we utilized a highly reproducible evolutionary adaptation in Saccharomyces cerevisiae to investigate whether experimental evolution of other yeast species would select for similar adaptive mutations...
February 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28195526/regulating-the-access-to-awareness-brain-activity-related-to-probe-related-and-spontaneous-reversals-in-binocular-rivalry
#9
Brian A Metzger, Kyle E Mathewson, Evelina Tapia, Monica Fabiani, Gabriele Gratton, Diane M Beck
Research on the neural correlates of consciousness (NCC) has implicated an assortment of brain regions, ERP components, and network properties associated with visual awareness. Recently, the P3b ERP component has emerged as a leading NCC candidate. However, typical P3b paradigms depend on the detection of some stimulus change, making it difficult to separate brain processes elicited by the stimulus itself from those associated with updates or changes in visual awareness. Here we used binocular rivalry to ask whether the P3b is associated with changes in awareness even in the absence of changes in the object of awareness...
February 14, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28195512/neuroradiological-findings-of-trisomy-13-in-a-rare-long-term-survivor
#10
Ryan D Goff, Bruno P Soares
Patau syndrome remains a difficult diagnosis for parents and a challenging conversation for clinicians due to the overall poor prognosis. Previous population-based reports have documented the sobering life expectancies of these patients, with few surviving to 1 year of age. Despite the high mortality rate in infants born with trisomy 13, there are several reports of survival into late childhood and early adulthood. While clinical outcomes have been well documented, there has been a paucity of literature describing postnatal imaging findings in long-term survivors...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28186859/multimodality-imaging-based-evaluation-of-single-lumen-silicone-breast-implants-for-rupture
#11
Stephen J Seiler, Pooja B Sharma, Jody C Hayes, Ramapriya Ganti, Ann R Mootz, Emily D Eads, Sumeet S Teotia, W Phil Evans
Breast implants are frequently encountered on breast imaging studies, and it is essential for any radiologist interpreting these studies to be able to correctly assess implant integrity. Ruptures of silicone gel-filled implants often occur without becoming clinically obvious and are incidentally detected at imaging. Early diagnosis of implant rupture is important because surgical removal of extracapsular silicone in the breast parenchyma and lymphatics is difficult. Conversely, misdiagnosis of rupture may prompt a patient to undergo unnecessary additional surgery to remove the implant...
February 10, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28186702/direct-conversion-of-human-fibroblasts-into-schwann-cells-that-facilitate-regeneration-of-injured-peripheral-nerve-in-vivo
#12
Yoshihiro Sowa, Tsunao Kishida, Koichi Tomita, Kenta Yamamoto, Toshiaki Numajiri, Osam Mazda
Schwann cells (SCs) play pivotal roles in the maintenance and regeneration of the peripheral nervous system. Although transplantation of SCs enhances repair of experimentally damaged peripheral and central nerve tissues, it is difficult to prepare a sufficient number of functional SCs for transplantation therapy without causing adverse events for the donor. Here, we generated functional SCs by somatic cell reprogramming procedures and demonstrated their capability to promote peripheral nerve regeneration. Normal human fibroblasts were phenotypically converted into SCs by transducing SOX10 and Krox20 genes followed by culturing for 10 days resulting in approximately 43% directly converted Schwann cells (dSCs)...
January 9, 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28186335/characterization-of-a-continuous-agitated-cell-reactor-for-oxygen-dependent-biocatalysis
#13
Asbjørn Toftgaard Pedersen, Teresa Melo de Carvalho, Euan Sutherland, Gustav Rehn, Robert Ashe, John M Woodley
Biocatalytic oxidation reactions employing molecular oxygen as the electron acceptor are difficult to conduct in a continuous flow reactor because of the requirement for high oxygen transfer rates. In this paper, the oxidation of glucose to glucono-1,5-lactone by glucose oxidase was used as a model reaction to study a novel continuous agitated cell reactor (ACR). The ACR consists of ten cells interconnected by small channels. An agitator is placed in each cell, which mixes the content of the cell when the reactor body is shaken by lateral movement...
February 10, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28181351/sedation-methods-for-transthoracic-echocardiography-in-children-with-trisomy-21-a-retrospective-study
#14
Jeff Miller, Lili Ding, James Spaeth, Jennifer Lam, Joanna Paquin, Erica Lin, Allison Divanovic, Bi Lian Li, Shankar Baskar, Andreas W Loepke
BACKGROUND: Many children with Trisomy 21 have neurologic or behavioral problems that make it difficult for them to remain still during noninvasive imaging studies, such as transthoracic echocardiograms (TTEcho). Recently, intranasal dexmedetomidine sedation has been introduced for this purpose. However, dexmedetomidine has been associated with bradycardia. Children with Trisomy 21 have been reported to have a higher risk of bradycardia and airway obstruction with sedation or anesthesia compared to children without Trisomy 21...
February 8, 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/28178367/surface-immobilization-of-molecular-electrocatalysts-for-energy-conversions
#15
Morris Bullock, Atanu K Das, Aaron M Appel
Electrocatalysts are critically important for a secure energy future, as they facilitate the conversion between electrical and chemical energy. Molecular catalysts offer precise control of structure that enables understanding of structure-reactivity relationships, which can be difficult to achieve with heterogeneous catalysts. Molecular electrocatalysts can be immobilized on surfaces by covalent bonds or through non-covalent interactions. Advantages of surface immobilization include the need for less catalyst, avoidance of bimolecular decomposition pathways, and easier determination of catalyst lifetime...
February 8, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28177530/intrauterine-contraception-insertion-pain-nursing-interventions-to-improve-patient-experience
#16
REVIEW
Carmel McCarthy
AIMS AND OBJECTIVES: To examine factors which contribute to the individual's experience of pain in relation to intrauterine contraception insertion and determine evidence based nursing strategies to best assess and manage this pain. BACKGROUND: Nurses are increasingly involved in consultations regarding intrauterine contraception. However, concerns regarding painful or difficult insertion may inhibit uptake and discourage nurses from promoting or inserting intrauterine contraception...
February 8, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/28177324/comparing-direct-and-indirect-selfing-rate-estimates-when-are-population-structure-estimates-reliable
#17
A Bürkli, N Sieber, K Seppälä, J Jokela
The rate of self-fertilization (that is, selfing) is a key evolutionary parameter in hermaphroditic species, yet obtaining accurate estimates of selfing rates in natural populations can be technically challenging. Most published estimates are derived from population-level heterozygote deficiency (that is, FIS) or identity disequilibria (for example, the software RMES (robust multilocus estimate of selfing)). These indirect methods can be applied to population genetic survey data, whereas direct methods using progeny arrays require much larger data sets that are often difficult to collect in natural populations or even require captive breeding...
February 8, 2017: Heredity
https://www.readbyqxmd.com/read/28167025/genome-editing-as-a-tool-to-achieve-the-crop-ideotype-and-de-novo-domestication-of-wild-relatives-case-study-in-tomato
#18
REVIEW
Agustin Zsögön, Tomas Cermak, Dan Voytas, Lázaro Eustáquio Pereira Peres
The ideotype is a theoretical model of an archetypal cultivated plant. Recent progress in genome editing is aiding the pursuit of this ideal in crop breeding. Breeding is relatively straightforward when the traits in question are monogenic in nature and show Mendelian inheritance. Conversely, traits with a diffuse, polygenic basis such as abiotic stress resistance are more difficult to harness. In recent years, many genes have been identified that are important for plant domestication and act by increasing yield, grain or fruit size or altering plant architecture...
March 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28165079/a-review-of-high-temperature-co-electrolysis-of-h2o-and-co2-to-produce-sustainable-fuels-using-solid-oxide-electrolysis-cells-soecs-advanced-materials-and-technology
#19
REVIEW
Yun Zheng, Jianchen Wang, Bo Yu, Wenqiang Zhang, Jing Chen, Jinli Qiao, Jiujun Zhang
High-temperature solid oxide electrolysis cells (SOECs) are advanced electrochemical energy storage and conversion devices with high conversion/energy efficiencies. They offer attractive high-temperature co-electrolysis routes that reduce extra CO2 emissions, enable large-scale energy storage/conversion and facilitate the integration of renewable energies into the electric grid. Exciting new research has focused on CO2 electrochemical activation/conversion through a co-electrolysis process based on the assumption that difficult C[double bond, length as m-dash]O double bonds can be activated effectively through this electrochemical method...
February 6, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28163141/probabilistic-conversion-of-neurosurgical-dbs-electrode-coordinates-into-mni-space
#20
Andreas Horn, Andrea A Kühn, Angela Merkl, Ludy Shih, Ron Alterman, Michael Fox
In neurosurgical literature, findings such as deep brain stimulation (DBS) electrode positions are conventionally reported in relation to the anterior and posterior commissures of the individual patient (AC/PC coordinates). However, the neuroimaging literature including neuroanatomical atlases, activation patterns, and brain connectivity maps has converged on a different population-based standard (MNI coordinates). Ideally, one could relate these two literatures by directly transforming MRIs from neurosurgical patients into MNI space...
February 3, 2017: NeuroImage
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