Read by QxMD icon Read


Sjoerd Tijmons, Matěj Karásek, G C H E de Croon
Robust attitude control is an essential aspect of research on autonomous flight of flapping wing Micro Air Vehicles. The mechanical solutions by which the necessary control moments are realised come at the price of extra weight and possible loss of aerodynamic efficiency. Stable flight of these vehicles has been shown by several designs using a conventional tail, but also by tailless designs that use active control of the wings. In this study a control mechanism is proposed that provides active control over the wings...
March 14, 2018: Bioinspiration & Biomimetics
Ebenezer K Aidoo, Yaw A Afrane, Maxwell Gesuge Machani, Winnie Chebore, Bernard Walter Lawson, Harrysone Atieli, Simon Kariuki, Ming-Chieh Lee, Cristian Koepfli, Guofa Zhou, Andrew K Githeko, Guiyun Yan
BACKGROUND: Identifying asymptomatic reservoirs of malaria parasites using index cases as entry points into the community is potentially a cost-effective way towards achieving malaria elimination. METHODS: Within 1 year, 1430 confirmed malaria cases were identified in Marani hospital, western Kenya. Fifty cases were followed up, and 108 index case household members and 612 neighbours within a 100 m radius were screened. As controls, samples were collected from 510 individuals matched with index cases and located at a distance of ≥ 500 m from them...
March 13, 2018: Malaria Journal
Jonathan W Wallace, Brandon G Rasman, Brian H Dalton
Maintaining standing balance involves multisensory processing and integration to produce dynamic motor responses. Electrical vestibular stimulation (EVS) delivered over the mastoid processes can be used to explore the vestibular control of balance. The purpose of this study was to determine whether intrinsic foot muscles exhibit vestibular-evoked balance responses and to characterize the traits associated with these responses. Electromyography (EMG) of the abductor hallucis, abductor digiti minimi and medial gastrocnemius and anterior-posterior (AP) forces were sampled while quietly standing participants were subjected to a random continuous EVS signal (peak-to-peak amplitude = ±3 mA)...
March 7, 2018: Neuroscience
Carrie W Hoppes, Patrick J Sparto, Susan L Whitney, Joseph M Furman, Theodore J Huppert
BACKGROUND AND PURPOSE: Individuals with visual vertigo describe symptoms of dizziness, disorientation, and/or impaired balance in environments with conflicting visual and vestibular information or complex visual stimuli. Physical therapists often prescribe habituation exercises using optic flow to treat these symptoms, but there are no evidence-based guidelines for delivering optic flow and it is unclear how the brain processes such stimuli. The purposes of this study were to use functional near-infrared spectroscopy (fNIRS) to explore cerebral activation during optic flow, and determine if visual fixation had a modulating effect on brain activity...
2018: PloS One
(no author information available yet)
[This corrects the article DOI: 10.1371/journal.pntd.0004927.].
March 2018: PLoS Neglected Tropical Diseases
Yoshiko Izawa, Hisao Suzuki
Focal stimulation in the frontal eye field (FEF) evoked eye movements that were often accompanied by neck movements. Experiments were performed with concurrent recording of both movements in trained monkeys. We recorded neck forces under a head-restrained condition using a force-measuring system. With the system, we measured forces along the x, y, and z axes and torque about the z axis. Torque about the z axis that represented yaw rotation of the head was significantly affected by stimulation. We found that stimulation generated two types of motor actions of the eyes and neck...
March 7, 2018: Journal of Neurophysiology
David Goodenough, Josh Levy, Hildur Olafsdottir, Ingvi Olafsson
This paper describes Development of a Phantom for Tomosynthesis with Potential for Automated Analysis via the Cloud. Several studies are underway to investigate the effectiveness of Tomosynthesis Mammographic Image Screening, including the large TMIST project as funded by the National Cancer Institute The development of the phantom described in this paper follows initiatives from the FDA, the AAPM TG245 task group, and European Reference Organization (EUREF) for Quality Assured Breast Screening and Diagnostic Services Committee report noting, that no formal endorsement nor recommendation for use has been sought, or granted by any of these groups...
March 6, 2018: Journal of Applied Clinical Medical Physics
Audrey H Zhuang, Arthur J Olch
The dosimetric consequences of errors in patient setup or beam delivery and anatomical changes are not readily known. A new product, PerFRACTION (Sun Nuclear Corporation), is designed to identify these errors by comparing the exit dose image measured on an electronic portal imaging device (EPID) from each field of each fraction to those from baseline fraction images. This work investigates the sensitivity of PerFRACTION to detect the deviation caused by these errors in a variety of realistic scenarios. Integrated EPID images were acquired in clinical mode and saved in ARIA...
March 6, 2018: Journal of Applied Clinical Medical Physics
Vivekanand Pandey Vimal, James R Lackner, Paul DiZio
To investigate the role of gravitational cues in the learning of a dynamic balancing task, we placed blindfolded subjects in a device programmed with inverted pendulum dynamics about the yaw axis. Subjects used a joystick to try and maintain a stable orientation at the direction of balance during 20 100 s-long trials. They pressed a trigger button on the joystick to indicate whenever they felt at the direction of balance. Three groups of ten subjects each participated. One group balanced with their body and the yaw axis vertical, and thus did not have gravitational cues to help them to determine their angular position...
March 6, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Matthew L Blank, Michelle L Parker, Raghavendran Ramaswamy, Cameron J Powell, Elizabeth D English, Yaw Adomako-Ankomah, Lena F Pernas, Sean D Workman, John C Boothroyd, Martin J Boulanger, Jon P Boyle
The Toxoplasma gondii locus mitochondrial association factor 1 (MAF1) encodes multiple paralogs, some of which mediate host mitochondrial association (HMA). Previous work showed that HMA was a trait that arose in T. gondii through neofunctionalization of an ancestral MAF1 ortholog. Structural analysis of HMA-competent and incompetent MAF1 paralogs (MAF1b and MAF1a, respectively) revealed that both paralogs harbor an ADP ribose binding macro domain, with comparatively low (micromolar) affinity for ADP ribose...
March 5, 2018: Molecular Microbiology
Prithvi B Murthy, Bradley C Gill, Sonali Khurana, Yaw A Nyame, Edmund S Sabanegh, Jihad H Kaouk
No abstract text is available yet for this article.
March 1, 2018: Urology
Jumpei Arata, Kazunari Fukami, Susumu Oguri, Shinya Onogi, Tetsuo Ikeda, Ryu Nakadate, Masamichi Sakaguchi, Tomohiko Akahoshi, Kanako Harada, Mamoru Mitsuishi, Makoto Hashizume
PURPOSE: Image guidance is a key technology that can improve the outcome of laparoscopic surgery. However, due to the large deformation caused by digestive organs, a computer-aided navigation system based on preoperative imaging data cannot indicate the correct target position of the lesion (e.g., liver tumors and vessels invisible from the organ surface). To overcome this issue, we developed a laparoscopic ultrasound manipulator with two motorized degrees of freedom at the tip, allowing for the performance of a dexterous ultrasound scan in a confined laparoscopic surgical area...
February 28, 2018: International Journal of Computer Assisted Radiology and Surgery
Katherine B Martin, Zakia Hammal, Gang Ren, Jeffrey F Cohn, Justine Cassell, Mitsunori Ogihara, Jennifer C Britton, Anibal Gutierrez, Daniel S Messinger
Background: Deficits in motor movement in children with autism spectrum disorder (ASD) have typically been characterized qualitatively by human observers. Although clinicians have noted the importance of atypical head positioning (e.g. social peering and repetitive head banging) when diagnosing children with ASD, a quantitative understanding of head movement in ASD is lacking. Here, we conduct a quantitative comparison of head movement dynamics in children with and without ASD using automated, person-independent computer-vision based head tracking (Zface)...
2018: Molecular Autism
Caitlin Richardson-Royer, Imran Naqvi, Christopher Riffel, Lawrence Harvey, Domonique Smith, Dagmawe Ayalew, Nasim Motayar, Yaw Amoateng-Adjepong, Constantine A Manthous
Background: Previous studies have demonstrated that video of and scripted information about cardiopulmonary resuscitation (CPR) can be deployed during clinician-patient end-of-life discussions. Few studies, however, examine whether video adds to verbal information-sharing. We hypothesized that video augments script-only decision-making. Methods: Patients aged >65 years admitted to hospital wards were randomized to receive evidence-based information ("script") vs...
2018: International Journal of General Medicine
Mike Fleuren, Johan L van Leeuwen, Elsa M Quicazan-Rubio, Remco P M Pieters, Bart J A Pollux, Cees J Voesenek
Fish make C-starts to evade predator strikes. Double-bend (DB) C-starts consist of three stages: Stage 1, in which the fish rapidly bends into a C-shape; Stage 2, in which the fish bends in the opposite direction; and a variable Stage 3. In single-bend (SB) C-starts, the fish immediately straightens after Stage 1. Despite fish moving in 3D space, fast-start responses of adult fish have mainly been studied in a horizontal plane. Using automated 3D tracking of multi-camera high-speed video sequences, we show that both SB and DB fast-starts by adult female least killifish ( Heterandria formosa ) often contain a significant vertical velocity component, and large changes in pitch (DB: up to 43 deg) and roll (DB: up to 77 deg) angles...
February 27, 2018: Journal of Experimental Biology
Weng Khong Lim, Sonia Davila, Jing Xian Teo, Chengxi Yang, Chee Jian Pua, Christopher Blöcker, Jing Quan Lim, Jianhong Ching, Jonathan Jiunn Liang Yap, Swee Yaw Tan, Anders Sahlén, Calvin Woon-Loong Chin, Bin Tean Teh, Steven G Rozen, Stuart Alexander Cook, Khung Keong Yeo, Patrick Tan
The use of consumer-grade wearables for purposes beyond fitness tracking has not been comprehensively explored. We generated and analyzed multidimensional data from 233 normal volunteers, integrating wearable data, lifestyle questionnaires, cardiac imaging, sphingolipid profiling, and multiple clinical-grade cardiovascular and metabolic disease markers. We show that subjects can be stratified into distinct clusters based on daily activity patterns and that these clusters are marked by distinct demographic and behavioral patterns...
February 2018: PLoS Biology
Chen-Jung Wu, Tung-Wei Kao, Chia-Kuang Tsai, Yaw-Wen Chang, Tao-Chun Peng, Hui-Fang Yang, Li-Wei Wu, Wei-Liang Chen
PURPOSED: This study examined the associations between 25-hydroxyvitamin D [25(OH)D] and common anthropometric parameters. METHODS: The data were derived from the National Health and Nutrition Examination Survey from 2001 through 2004. We divided all subjects into two groups with a cut-off point for body mass index set at 30. The primary outcome was the potential relationship between the anthropometric parameters and 25(OH)D status. RESULTS: A positive association was found between the 25(OH)D levels and calf circumference (CC) in all of the designed models (P < 0...
February 23, 2018: Clinica Chimica Acta; International Journal of Clinical Chemistry
Biplab Sarkar, Jyotirmoy Ray, Tharmar Ganesh, Arjunan Manikandan, Anusheel Munshi, Sasikumar Rathinamuthu, Harpreet Kaur, Satheeshkumar Anbazhagan, Upendra Kumar Giri, Soumya Roy, Kanan Jassal, Bidhu Kalyan Mohanti
The aim of this article is to derive and verify mathematical formulation for the reduction of the six dimensional (6D) positional inaccuracies of patients (lateral, longitudinal, vertical, pitch, roll and yaw) to three-dimensional (3D) linear shifts. &#13; The formulation was mathematically and experimentally tested and verified for 169 stereotactic radiotherapy patients. The mathematical verification involves the comparison of any ( one) of the calculated rotational coordinate with the corresponding value from the 6D shifts obtained by cone beam computed tomography (CBCT)...
February 26, 2018: Physics in Medicine and Biology
Christina Klasen, Tamar Ziehm, Michael Huber, Yaw Asare, Aphrodite Kapurniotu, Idit Shachar, Jürgen Bernhagen, Omar El Bounkari
Macrophage migration inhibitory factor (MIF) is a chemokine-like inflammatory cytokine, which plays a pivotal role in the pathogenesis of inflammatory and cardiovascular diseases as well as cancer. We previously identified MIF as a novel B cell chemokine that promotes B cell migration through non-cognate interaction with the CXC chemokine receptor CXCR4 and CD74, the surface form of MHC class II invariant chain. In this study, we have analyzed the regulation of the MIF receptors under inflammatory conditions by investigating the impact of lipopolysaccharide (LPS), tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β) on CD74 and CXCR4 expression in B lymphocytes...
February 21, 2018: Cellular Signalling
Dale W Litzenberg, Daniel G Muenz, Paul G Archer, William C Jackson, Daniel A Hamstra, Jason W Hearn, Matthew J Schipper, Daniel E Spratt
PURPOSE: Investigate the impact on prostate orientation caused by use and removal of a Foley catheter, and the dosimetric impact on men prospectively treated with prostate stereotactic body radiotherapy (SBRT). METHODS: Twenty-two men underwent a CT simulation with a Foley in place (FCT), followed immediately by a second treatment planning simulation without the Foley (TPCT). The change in prostate orientation was determined by rigid registration of three implanted transponders between FCT and TPCT and compared to measured orientation changes during treatment...
February 23, 2018: Medical Physics
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"