keyword
MENU ▼
Read by QxMD icon Read
search

Bifurcations

keyword
https://www.readbyqxmd.com/read/29150760/slow-passage-through-a-hopf-bifurcation-in-excitable-nerve-cables-spatial-delays-and-spatial-memory-effects
#1
L M Bilinsky, S M Baer
It is well established that in problems featuring slow passage through a Hopf bifurcation (dynamic Hopf bifurcation) the transition to large-amplitude oscillations may not occur until the slowly changing parameter considerably exceeds the value predicted from the static Hopf bifurcation analysis (temporal delay effect), with the length of the delay depending upon the initial value of the slowly changing parameter (temporal memory effect). In this paper we introduce new delay and memory effect phenomena using both analytic (WKB method) and numerical methods...
November 17, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/29150174/a-new-species-of-discocyrtanus-from-mato-grosso-brazil-opiliones-gonyleptidae-with-a-key-to-the-species-of-the-genus
#2
Rafael N Carvalho, Adriano B Kury
Discocyrtanus canjinjim sp. n., belonging to the family Gonyleptidae Sundevall, 1833 is described based on nineteen specimens, eleven adult males and eight adult females, collected in the Vila Bela da Santíssima Trindade, in the State of Mato Grosso, Brazil. This new species represents an endemic component for the harvestmen fauna of Chiquitano Dry Forests terrestrial eco-region, being the most occidental point of distribution of the genus, notably found in the Cerrado and the Atlantic Forest. The new species is characterized by femur IV swollen with the same length of dorsal scutum, trochanter IV with prodorsal distal apophysis as a stout hook not bifurcated, and a unique form of genitalia in the genus...
November 14, 2017: Comptes Rendus Biologies
https://www.readbyqxmd.com/read/29148142/outcomes-of-primary-percutaneous-coronary-intervention-in-acute-myocardial-infarction-due-to-unprotected-left-main-thrombosis-the-asia-pacific-left-main-st-elevation-registry-aster
#3
Jonathan Yap, Gagan D Singh, Jung-Sun Kim, Krishan Soni, Kelvin Chua, Alvin Neo, Choong Hou Koh, Ehrin J Armstrong, Stephen W Waldo, Kendrick A Shunk, Reginald I Low, Myeong-Ki Hong, Yangsoo Jang, Khung Keong Yeo
INTRODUCTION: Prior studies of ULM STEMI have been confined to small cohorts. Recent registry data with larger patient cohorts have shown contrasting results. We aim to study the outcomes of patients with unprotected left main (ULM) ST-elevation myocardial infarction (STEMI) who underwent primary percutaneous coronary intervention (PCI). METHODS: The Asia-pacific left main ST-Elevation Registry (ASTER) is a multicenter retrospective registry involving 4 sites in Singapore, South Korea, and the United States...
November 16, 2017: Journal of Interventional Cardiology
https://www.readbyqxmd.com/read/29147633/a-unique-case-of-carotid-splaying-by-a-cervical-vagal-neurofibroma-and-the-role-of-neuroradiology-in-surgical-management
#4
Sally A Itawi, Mark Buehler, Robert E Mrak, Tarek R Mansour, Yacine Medhkour, Azedine Medhkour
Carotid splaying, also known as the Lyre sign, is a widening of the carotid bifurcation due to the displacement of the internal carotid artery and the external carotid artery just distal to the point of divergence. This phenomenon is classically exhibited by highly vascularized carotid body tumors and, in rare cases, by cervical sympathetic chain schwannomas. Demonstration of the Lyre sign by a cervical vagal neurofibroma, however, is a unique occurrence that has not been previously documented in the literature...
September 7, 2017: Curēus
https://www.readbyqxmd.com/read/29147596/carotidynia-a-rare-diagnosis-for-unilateral-neck-pain-revealed-by-cross-sectional-imaging
#5
Corrado Santarosa, Salvatore Stefanelli, Roman Sztajzel, Pravin Mundada, Minerva Becker
Idiopathic carotidynia (IC) is a rare and poorly understood syndrome consisting of unilateral neck pain, tenderness, and increased pulsations over the affected carotid bifurcation. A growing body of evidence supports the hypothesis that IC is a distinct clinicopathologic entity with characteristic imaging features. We report the case of a 34-year-old Caucasian male presenting with intense unilateral neck pain in the emergency setting. Computed tomography and ultrasonography revealed fusiform eccentric thickening of the ipsilateral carotid bifurcation without vessel narrowing...
2017: Case Reports in Radiology
https://www.readbyqxmd.com/read/29146947/the-semiquinone-swing-in-the-bifurcating-electron-transferring-flavoprotein-butyryl-coa-dehydrogenase-complex-from-clostridium-difficile
#6
Julius K Demmer, Nilanjan Pal Chowdhury, Thorsten Selmer, Ulrich Ermler, Wolfgang Buckel
The electron transferring flavoprotein/butyryl-CoA dehydrogenase (EtfAB/Bcd) catalyzes the reduction of one crotonyl-CoA and two ferredoxins by two NADH within a flavin-based electron-bifurcating process. Here we report on the X-ray structure of the Clostridium difficile (EtfAB/Bcd)4 complex in the dehydrogenase-conducting D-state, α-FAD (bound to domain II of EtfA) and δ-FAD (bound to Bcd) being 8 Å apart. Superimposing Acidaminococcus fermentans EtfAB onto C. difficile EtfAB/Bcd reveals a rotation of domain II of nearly 80°...
November 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/29146671/predictors-and-long-term-clinical-outcome-of-longitudinal-stent-deformation-insights-from-pooled-analysis-of-korean-multicenter-drug-eluting-stent-cohort
#7
Tae-Min Rhee, Kyung Woo Park, Joo Myung Lee, Michael S Lee, Ki-Hyun Jeon, Hyun-Jae Kang, Bon-Kwon Koo, Jay Young Rhew, Kwang Soo Cha, Jang-Ho Bae, Kyoo-Rok Han, Si-Hoon Park, Woo-Jung Park, Seung-Woon Rha, Seok-Kyu Oh, Hyuck Moon Kwon, Ki-Bae Seung, Taehoon Ahn, Sang-Hyun Kim, Hyo-Soo Kim
BACKGROUND: There are limited data on the frequency of and factors associated with quantitative coronary angiography (QCA)-defined longitudinal stent deformation (LSD) in various contemporary drug-eluting stents platforms. This study sought to evaluate the predictors of LSD and its long-term clinical implication. METHODS AND RESULTS: A patient-level pooled analysis was performed with 7350 lesions in 5871 patients treated with platinum-chromium-based everolimus-eluting stent (Promus Element), cobalt-chromium-based everolimus-eluting stent (Promus/Xience V), or cobalt-chromium-based zotarolimus-eluting stent (Endeavor Resolute)...
November 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29146551/dual-lumen-microcatheters-for-complex-percutaneous-coronary-interventions
#8
REVIEW
Jacopo A Oreglia, Roberto Garbo, Andrea Gagnor, Gabriele L Gasparini
In some bifurcation anatomies side branch wiring can be difficult particularly when side branch is highly angulated. Furthermore a combination of bifurcations and chronic total occlusion can be a real challenge for interventional cardiologists. New devices have been produced to facilitate complex PCI and recently introduced dual lumen microcatheters can be really helpful in these scenarios. All these devices have both a rapid-exchange and an over-the-wire lumen. The rationale for dual lumen microcatheters is to preserve the highest number of side-branches...
October 4, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/29143863/morphometric-properties-of-the-latissimus-dorsi-muscle-in-human-fetuses-for-flap-surgery
#9
Orhan Beger, Burhan Beger, Deniz Uzmansel, Semra Erdoğan, Zeliha Kurtoğlu
PURPOSE: Although latissimus dorsi (LD) flaps are extensively used in a wide range of interventions, fetus studies on this subject are quite limited. This study aims to obtain detailed information about the morphometric features of LD, thoracodorsal artery (TDA) and nerve (TDN). METHODS: The study was carried out on both sides of 50 formalin-fixed human fetuses (22 male/28 female) with a mean gestational age of 24.5 ± 4.7 (range 18-36) weeks, which were in the inventory of Anatomy Department of Mersin University Faculty of Medicine...
November 16, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29143100/infrarenal-aortic-diameter-aortoiliac-bifurcation-level-and-lumbar-disc-degenerative-changes-a-cross-sectional-mr-study
#10
Abolhassan Shakeri, Moslem Shakeri, Mohammadreza Ojaghzadeh Behrooz, Razieh Behzadmehr, Zohreh Ostadi, Daniel Fadaei Fouladi
PURPOSE: To examine a possible correlation of infrarenal aortic diameter and aortoiliac bifurcation level with lumbar disc degenerative changes. METHODS: This was a cross-sectional, single-center retrospective study on lumbar magnetic resonance images of patients with low back pain (n = 496). Lumbar disc degenerative changes were reported on the basis of the Pfirrmann grading system and accordingly, patients were grouped as with grade I-II findings (n = 192), with grade III findings (n = 64) and with grade IV-V findings (n = 240)...
November 15, 2017: European Spine Journal
https://www.readbyqxmd.com/read/29142494/endovascular-treatment-of-abdominal-aortic-aneurysm-with-complete-iliac-occlusion-case-series-and-literature-review
#11
Randall W Franz, M Taha Ibrahim, Christopher F Tanga, David A Epstein
In patients with abdominal aortic aneurysms (AAA) and complete iliac occlusion, endovascular aortic aneurysm repair (EVAR) using a bifurcated stent graft has clear advantages over aortouniiliac stent grafts. Bifurcated stent grafts had improved hemodynamic flow and increased primary and secondary patency rates compared with aortouniiliac stent grafts. The use of aortouniiliac stent grafts with femorofemoral crossover bypass is associated with complications including infection of the prosthesis, steal phenomenon, and the associated difficulties for further endovascular access at the site of the femoral anastomosis...
December 2017: International Journal of Angiology: Official Publication of the International College of Angiology, Inc
https://www.readbyqxmd.com/read/29140261/proximate-composition-and-nutritional-value-of-three-macroalgae-ascophyllum-nodosum-fucus-vesiculosus-and-bifurcaria-bifurcata
#12
José M Lorenzo, Rubén Agregán, Paulo E S Munekata, Daniel Franco, Javier Carballo, Selin Şahin, Ramón Lacomba, Francisco J Barba
Proximate composition (moisture, protein, lipid and ash content) and nutritional value (fatty acid, amino acid and mineral profile) of three macroalgae (Ascophyllum nodosum, Fucus vesiculosus and Bifurcaria bifurcate) were studied. Chemical composition was significantly (p < 0.001) different among the three seaweeds. In this regard, the B. bifurcata presented the highest fat content (6.54% of dry matter); whereas, F. vesiculosus showed the highest protein level (12.99% dry matter). Regarding fatty acid content, the polyunsaturated fatty acids (PUFAs) were the most abundant followed by saturated fatty acids (SFAs) and monounsaturated fatty acids (MUFAs)...
November 15, 2017: Marine Drugs
https://www.readbyqxmd.com/read/29139034/vessel-centerline-reconstruction-from-non-isocentric-and-non-orthogonal-paired-monoplane-angiographic-images
#13
Mie Kunio, Caroline C O'Brien, Augusto C Lopes, Lynn Bailey, Pedro A Lemos, Guillermo J Tearney, Elazer R Edelman
PURPOSE: Three-dimensional reconstruction of a vessel centerline from paired planar coronary angiographic images is critical to reconstruct the complex three-dimensional structure of the coronary artery lumen and the relative positioning of implanted devices. In this study, a new vessel centerline reconstruction method that can utilize non-isocentric and non-orthogonal pairs of angiographic images was developed and tested. METHODS: Our new method was developed in in vitro phantom models of bifurcated coronary artery with and without stent, and then tested in in vivo swine models (twelve coronary arteries)...
November 14, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29138649/-clinical-and-electrocardiographic-aspect-of-pulmonary-embolism-masking-aortic-dissection-revealed-by-thoracic-ct-angiography
#14
Daniella Rakotoniaina Masinarivo, Jenny Larissa Rakotomanana
We here report the case of a 52-year old hypertensive, obese woman (BMI 32,46 kg/m(2)) with a past history of smoking and without evidence-based risk factors of venous thromboembolism, hospitalized for left chest pain radiating to the dorsolumbar region associated with dyspnoea. Clinical examination on hopitalization showed left blood pressure 100/60 mmHg, tachycardia 100/min, oxygen desaturation index at 88% with the patient breathing ambient air, normal cardiopulmonary auscultation, peripheral pulses palpable and no symptoms of phlebitis of the lower limbs...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/29137810/technique-for-precaval-and-laterocaval-nodes-excision-at-extraperitoneal-paraaortic-lymphadenectomy
#15
M Gorostidi, C Villalain, R Ruiz, I Jaunarena, A Lekuona
STUDY OBJECTIVE: To describe our technique for excision of the pre-caval and laterocaval nodes using an extraperitoneal approach. This technique was developed to make the dissection and excision of the less accessible nodes in an easier and safer way by minimizing the risk of great vessels injury and bleeding. DESIGN: Step-by-step description of the surgical procedure using video (Canadian Task Force classification III). SETTING: The procedure was performed at a teaching hospital, Hospital Universitario Donostia (Spain)...
November 11, 2017: Gynecologic Oncology
https://www.readbyqxmd.com/read/29135391/gongylonema-parasites-of-rodents-a-key-to-species-and-new-data-on-gongylonema-neoplasticum
#16
Helrik Costa Cordeiro, Francisco Tiago de Vasconcelos Melo, Elane Guerreiro Giese, Jeannie Nascimento Dos Santos
Specimens of the genus Gongylonema were collected from the gastric mucosa of rodents of the Rattus rattus Linnaeus, 1758 and Rattus norvegicus Berkenhout, 1769 collected in urban areas in Belém, Pará, in the eastern Brazilian Amazon. The helminths were processed for analysis using light microscopy and scanning electron microscopy (SEM) techniques, and presented taxonomic characteristics of the species Gongylonema neoplasticum. The SEM analyses revealed the presence of 2 developed buccal plates (1 dorsal, 1 ventral), also called interlabia, with a proeminent and bifurcated ventral plaque...
November 14, 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/29134343/factors-influencing-cerebral-aneurysm-obliteration-and-reliability-of-indocyanine-green-video-angiography
#17
Masayuki Gekka, Naoki Nakayama, Haruto Uchino, Kiyohiro Houkin
BACKGROUND: Indocyanine green video-angiography (ICG-V) is commonly used for intraoperative confirmation of aneurysm obliteration following clipping. However, direct puncture of the aneurysm wall occasionally results in blood leakage in patients for whom ICG-V has indicated complete closure. Therefore, the present study aimed to determine the reliability of ICG-V for confirming complete aneurysm closure, and to elucidate the factors underlying aneurysm obliteration and the occurrence of false-negative ICG-V findings...
November 13, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29134067/modelling-the-role-of-correctional-services-on-gangs-insights-through-a-mathematical-model
#18
F Nyabadza, C P Ogbogbo, J Mushanyu
Research has shown that gang membership increases the chances of offending, antisocial behaviour and drug use. Gang membership should be acknowledged as part of crime prevention and policy designs, and when developing interventions and preventative programmes. Correctional services are designed to rehabilitate convicted offenders. We formulate a deterministic mathematical model using nonlinear ordinary differential equations to investigate the role of correctional services on the dynamics of gangs. The recruitment into gang membership is assumed to happen through an imitation process...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29131890/modeling-inspiratory-flow-in-a-porcine-lung-airway
#19
Peshala/P Thibotuwawa Gamage, Fardin Khalili, Md/Khurshidul Azad, Hansen/A Mansy
Inspiratory flow in a multi-generation pig lung airways was numerically studied at a steady inlet flow rate of 3.2×10-4 m3/s corresponding to a Reynolds number of 1150 in the trachea. The model was validated by comparing velocity distributions with previous measurements and simulations in simplified airway geometries. Simulation results provided detailed maps of the axial and secondary flow patterns at different cross sections of the airway tree. The vortex core regions in the airways were visualized using absolute helicity values and suggested the presence of secondary flow vortices where two counter rotating vortices were observed at the main bifurcation and in many other bifurcations...
November 13, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29131806/impact-of-guidewire-recrossing-point-into-stent-jailed-side-branch-for-optimal-kissing-balloon-dilatation-corelab-3d-optical-coherence-tomography-analysis
#20
Takayuki Okamura, Ryoji Nagoshi, Tatsuhiro Fujimura, Yoshinobu Murasato, Masahiro Yamawaki, Shiro Ono, Takeshi Serikawa, Yutaka Hikichi, Hiroaki Norita, Fumiaki Nakao, Tomohiro Sakamoto, Toshiro Shinke, Junya Shite
AIMS: We investigated the influence of the guidewire recrossing point on the incidence of incomplete stent apposition (ISA) after kissing balloon dilatation (KBD), and clinical and angiographic outcome at 9 months in a prospective multicenter registry. METHODS AND RESULTS: One hundred five patients underwent single crossover stenting across the side branch (SB) and subsequent KBD. Jailing configuration of the SB orifice and the guidewire recrossing position were assessed by off-line 3D-OCT in the corelab...
November 14, 2017: EuroIntervention
keyword
keyword
71557
1
2
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"