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https://www.readbyqxmd.com/read/28529383/the-pelskin-project-part-ii-investigating-the-physical-coupling-between-flexible-filaments-in-an-oscillating-flow
#1
Alistair Revell, Joseph O'Connor, Abhishek Sarkar, Cuicui Li, Julien Favier, Laura Kamps, Christoph Brücker
The fluid-structure interaction mechanisms of a coating composed of flexible flaps immersed in a periodically oscillating channel flow is here studied by means of numerical simulation, employing the Euler-Bernoulli equations to account for the flexibility of the structures. A set of passively actuated flaps have previously been demonstrated to deliver favourable aerodynamic impact when attached to a bluff body undergoing periodic vortex shedding. As such, the present configuration is identified to provide a useful test-bed to better understand this mechanism, thought to be linked to experimentally observed travelling waves...
2017: Meccanica
https://www.readbyqxmd.com/read/28529027/management-of-postneurosurgical-meningitis-narrative-review
#2
REVIEW
Khetam Hussein, Roni Bitterman, Ben Shofty, Mical Paul, Ami Neuberger
BACKGROUND: Infections complicating neurosurgery pose unacceptable mortality and morbidity. AIMS: To summarize what is known about the epidemiology, diagnosis and treatment of post-neurosurgical meningitis (PNM). SOURCES: PubMed, references of identified studies and reviews, and personal experience when evidence was lacking. CONTENT: The incidence and pathogen distribution of PNM is highly variable. A shift towards Gram-negative bacteria has been observed with use of antibiotic prophylaxis and antibiotic-coated devices directed mainly against Gram-positive bacteria...
May 18, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28516728/increased-heterogeneity-of-airway-calibre-in-adult-rats-after-hypoxia-induced-intrauterine-growth-restriction
#3
Kimberley C W Wang, Jude S Morton, Sandra T Davidge, Alexander N Larcombe, Alan L James, Graham M Donovan, Peter B Noble
BACKGROUND AND OBJECTIVE: Intrauterine growth restriction (IUGR) is associated with asthma development. We hypothesized that IUGR disrupts airway development leading to postnatal structural abnormalities of the airway that predispose to disease. This study therefore examined structural changes to the airway and lung in a rat model of maternal hypoxia-induced IUGR. METHODS: Pregnant rats were housed under hypoxic conditions (11.5% O2 ) from gestational days (GDs) 13 to 20 (pseudoglandular-canalicular stages, i...
May 17, 2017: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/28513815/epidemiology-of-paediatric-meningitis-in-central-c%C3%A3-te-d-ivoire-after-the-implementation-of-haemophilus-influenzae-type-b-vaccination
#4
Fidèle S Touré, Samson Kouame, Honoré Tia, Pacôme Monemo, Amadou Cissé, Bamourou Diané, Sören L Becker, Chantal Akoua-Koffi
Infectious meningitis accounts for enormous morbidity worldwide, but there is a paucity of data on its regional epidemiology in resource-constrained settings of sub-Saharan Africa. Here, we present a study on the aetiology of paediatric meningitis in central Côte d'Ivoire. Between June 2012 and December 2013, all cerebrospinal fluid (CSF) samples drawn at the University Teaching Hospital Bouaké were examined for the presence of bacterial and fungal pathogens. A causative agent was detected in 31 out of 833 CSF specimens (3...
May 17, 2017: New Microbiologica
https://www.readbyqxmd.com/read/28508359/evolving-relevance-of-neuroproteomics-in-alzheimer-s-disease
#5
Simone Lista, Henrik Zetterberg, Sid E O'Bryant, Kaj Blennow, Harald Hampel
Substantial progress in the understanding of the biology of Alzheimer's disease (AD) has been achieved over the past decades. The early detection and diagnosis of AD and other age-related neurodegenerative diseases, however, remain a challenging scientific frontier. Therefore, the comprehensive discovery (relating to all individual, converging or diverging biochemical disease mechanisms), development, validation, and qualification of standardized biological markers with diagnostic and prognostic functions with a precise performance profile regarding specificity, sensitivity, and positive and negative predictive value are warranted...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28507387/multidisciplinary-approach-to-the-prenatal-diagnosis-and-post-natal-management-of-a-large-suprasellar-arachnoid-cyst-a-case-report
#6
Omar Irfan, Heera Nand Rathore, Sarfraz Karim, Shabina Ariff, Aneela Darbar
Arachnoid cysts are intra-arachnoid sacs filled with cerebrospinal fluid representing a rare occurence in neonates. We report the case of a suprasellar arachnoid cyst diagnosed prenatally at 21 weeks gestation on routine obstetric ultrasound. A cystic lesion was picked up incidentally at routine antenatal scan. The cyst was noted to be increasing in size over a series of radiological scans. The cyst was diagnosed as a suprasellar arachnoid cyst compressing the third ventricle and bilateral lateral ventricles...
May 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28506222/computational-fluid-dynamics-study-of-intra-arterial-chemotherapy-for-oral-cancer
#7
Hiroaki Kitajima, Marie Oshima, Toshinori Iwai, Yoshihito Ohhara, Yasuharu Yajima, Kenji Mitsudo, Iwai Tohnai
BACKGROUND: Intra-arterial chemotherapy (IAC) for oral cancer can deliver a higher concentration of anticancer agent into a tumor-feeding artery than intravenous systemic chemotherapy. However, distribution of anticancer agent into several branches of the external carotid artery (ECA) in IAC has not demonstrated sufficient treatment efficacy. To improve the effectiveness of IAC, the flow distribution of anticancer agent into the branches of the ECA in several IAC methods was investigated using computational fluid dynamics (CFD)...
May 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28505795/parallelization-of-microfluidic-flow-focusing-devices
#8
Esther Amstad, Xiaoming Chen, Max Eggersdorfer, Noa Cohen, Thomas E Kodger, Carolyn L Ren, David A Weitz
Microfluidic flow-focusing devices offer excellent control over fluid flow, enabling formation of drops with a narrow size distribution. However, the throughput of microfluidic flow-focusing devices is limited and scale-up through operation of multiple drop makers in parallel often compromises the robustness of their operation. We demonstrate that parallelization is facilitated if the outer phase is injected from the direction opposite to that of the inner phase, because the fluid injection flow rate, where the drop formation transitions from the squeezing into the dripping regime, is shifted towards higher values...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28505752/surface-switching-statistics-of-rotating-fluid-disk-rim-gap-effects
#9
Yuji Tasaka, Makoto Iima
We examined the influence of internal noise on the irregular switching of the shape of the free surface of fluids in an open cylindrical vessel driven by a bottom disk rotating at constant speed [Suzuki, Iima, and Hayase, Phys. Fluids 18, 101701 (2006)PHFLE61070-663110.1063/1.2359740]. A slight increase in the disk-rim gap (less than 3% of the disk radius) was established experimentally to cause significant changes in this system, specifically, frequent appearance of the surface descending event connecting a nonaxisymmetric shape in strong mixing flow (turbulent flow) and an axisymmetric shape in laminar flow, as well as a shift in critical Reynolds number that define the characteristic states...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28505748/highly-pressurized-partially-miscible-liquid-liquid-flow-in-a-micro-t-junction-i-experimental-observations
#10
Ning Qin, John Z Wen, Carolyn L Ren
This is the first part of a two-part study on a partially miscible liquid-liquid flow (liquid carbon dioxide and deionized water) which is highly pressurized and confined in a microfluidic T-junction. Our main focuses are to understand the flow regimes as a result of varying flow conditions and investigate the characteristics of drop flow distinct from coflow, with a capillary number, Ca_{c}, that is calculated based on the continuous liquid, ranging from 10^{-3} to 10^{-2} (10^{-4} for coflow). Here in part I, we present our experimental observation of drop formation cycle by tracking drop length, spacing, frequency, and after-generation speed using high-speed video and image analysis...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28501825/maternal-bradycardia-occurring-prior-to-onset-of-hellp-syndrome-in-a-woman-with-pre-eclampsia
#11
Ami Hosokawa, Takeshi Umazume, Takahiro Yamada, Hisanori Minakami
A 36-year-old nulliparous woman developed pre-eclampsia at gestational week (GW) 28(-6/7) Cardiac status was checked regularly. Heart rate of 93 beats per minute (bpm) with left atrial diameter (LAD) of 35 mm, left ventricular hypertrophy and inferior vena cava diameter (IVCD) of 8 mm at GW 32(-0/7) decreased to 48 bpm with an expanded IVCD to 25 mm, dilated left atrium (LAD to 39 mm), increased pulmonary arterial pressure, increased systemic vascular resistance (approximate 3000  dyn s/cm(5)) and biphasic intrarenal venous flow pattern 3...
May 13, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28500386/thermodynamics-of-enzyme-catalyzed-esterifications-i-succinic-acid-esterification-with-ethanol
#12
Emrah Altuntepe, Thorsten Greinert, Felix Hartmann, Annika Reinhardt, Gabriele Sadowski, Christoph Held
Succinic acid (SA) was esterified with ethanol using Candida antarctica lipase B immobilized on acrylic resin at 40 and 50 °C. Enzyme activity in the reaction medium was assured prior to reaction experiments. Reaction-equilibrium experiments were performed for varying initial molalities of SA and water in the reaction mixtures. This allowed calculating the molality-based apparent equilibrium constant K m as function of concentration and temperature. K m was shown to depend strongly on the molality of water and SA as well as on temperature...
May 12, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28498237/enhanced-recovery-after-surgery-for-advanced-ovarian-cancer-a-systematic-review-of-interventions-trialed
#13
Kristina Lindemann, Peey-Sei Kok, Martin Stockler, Ken Jaaback, Alison Brand
OBJECTIVES: We sought to summarize the evidence for interventions aiming at enhanced recovery after surgery (ERAS) in ovarian cancer through a systematic review. METHODS: We searched MEDLINE, EMBASE, and The Cochrane Library for studies testing ERAS interventions in patients undergoing surgery for ovarian cancer. Study selection and data extraction were done independently by 2 reviewers with disagreements resolved by discussion with a senior, third reviewer. RESULTS: We identified 25 studies including 1648 participants with ovarian cancer...
May 12, 2017: International Journal of Gynecological Cancer
https://www.readbyqxmd.com/read/28497107/ngp-555-a-%C3%AE-secretase-modulator-lowers-the-amyloid-biomarker-a%C3%AE-42-in-cerebrospinal-fluid-while-preventing-alzheimer-s-disease-cognitive-decline-in-rodents
#14
Maria Z Kounnas, Courtney Lane-Donovan, Dan W Nowakowski, Joachim Herz, William T Comer
INTRODUCTION: Alzheimer's disease (AD) is defined by the progressive accumulation of amyloid plaques and neurofibrillary tangles in the brain which precedes cognitive decline by years. METHODS: Using amyloid biomarkers, chemical modeling, mouse behavioral models, and drug development techniques we investigate the properties of NGP 555, a clinical-stage γ-secretase modulator. RESULTS: NGP 555 shifts amyloid peptide production to the smaller, non-aggregating forms of amyloid...
January 2017: Alzheimer's & Dementia: Translational Research & Clinical Interventions
https://www.readbyqxmd.com/read/28496012/daytime-behavior-of-pteropus-vampyrus-in-a-natural-habitat-the-driver-of-viral-transmission
#15
Yupadee Hengjan, Didik Pramono, Hitoshi Takemae, Ryosuke Kobayashi, Keisuke Iida, Takeshi Ando, Supratikno Supratikno, Chaerul Basri, Yuli Sulistya Fitriana, Eko M Z Arifin, Yasushige Ohmori, Ken Maeda, Srihadi Agungpriyono, Eiichi Hondo
Flying foxes, the genus Pteropus are considered viral reservoirs. Their colonial nature and long flight capability enhance their ability to spread viruses quickly. To understand how the viral transmission occurs between flying foxes and other animals, we investigated daytime behavior of the large flying fox (Pteropus vampyrus) in the Leuweung Sancang conservation area, Indonesia, by using instantaneous scan sampling and all occurrence focal sampling. The data were obtained from 0700 to 1700 hr, during May 11-25, 2016...
May 12, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28495842/the-impact-of-ocular-hemodynamics-and-intracranial-pressure-on-intraocular-pressure-during-acute-gravitational-changes
#16
Emily S Nelson, Lealem Mulugeta, Andrew Feola, Julia Raykin, Jerry G Myers, Brian C Samuels, C Ross Ethier
Exposure to microgravity causes a bulk fluid shift toward the head, with concomitant changes in blood volume/pressure, intraocular pressure (IOP), and intracranial pressure (ICP). These and other factors are thought to contribute to Visual Impairment and Intracranial Pressure syndrome, a significant health concern for astronauts, characterized by degradation of visual function and ocular anatomical changes. Here we describe a lumped-parameter numerical model to simulate volume/pressure alterations in the eye during gravitational changes...
May 11, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28495841/lower-body-negative-pressure-decreases-non-invasively-measured-intracranial-pressure-and-internal-jugular-vein-cross-sectional-area-during-head-down-tilt
#17
William Watkins, Alan R Hargens, Shannon Baird, Erika Marie Clary, Brandon R Macias
INTRODUCTION: Long-term space flight induces a near visual acuity change in approximately 50% of astronauts. In some crew members, postflight cerebrospinal fluid (CSF) opening pressures by lumbar puncture are as high as 20.9 mmHg who demonstrated optic disc edema. CSF communicates through the cochlear aqueduct to affect perilymphatic pressure and tympanic membrane motion. We hypothesized that 50 mmHg of lower-body negative pressure (LBNP) during 15° head-down tilt (HDT) would mitigate elevations in internal jugular vein cross-sectional area (IJV CSA) and intracranial pressure (ICP)...
May 11, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28494574/endoscopic-management-of-peri-pancreatic-fluid-collections
#18
REVIEW
Hon Chi Yip, Anthony Yuen Bun Teoh
In the past decade, there has been a progressive paradigm shift in the management of peri-pancreatic fluid collections after acute pancreatitis. Refinements in the definitions of fluid collections from the updated Atlanta classification have enabled better communication amongst physicians in an effort to formulate optimal treatments. Endoscopic ultrasound (EUS)-guided drainage of pancreatic pseudocysts has emerged as the procedure of choice over surgical cystogastrostomy. The approach provides similar success rates with low complications and better quality of life compared with surgery...
May 12, 2017: Gut and Liver
https://www.readbyqxmd.com/read/28493012/eeg-microstate-correlates-of-fluid-intelligence-and-response-to-cognitive-training
#19
Emiliano Santarnecchi, Arjun R Khanna, Christian S Musaeus, Christopher S Y Benwell, Paula Davila, Faranak Farzan, Santosh Matham, Alvaro Pascual-Leone, Mouhsin M Shafi
The neurobiological correlates of human fluid intelligence (Gf) remain elusive. Here, we demonstrate that spatiotemporal dynamics of EEG activity correlate with baseline measures of Gf and with its modulation by cognitive training. EEG dynamics were assessed in 74 healthy participants by examination of fast-changing, recurring, topographically-defined electric patterns termed "microstates", which characterize the electrophysiological activity of distributed cortical networks. We find that the frequency of appearance of specific brain topographies, spatially associated with visual (microstate B) and executive control (microstate C) networks, respectively, is inversely related to Gf scores...
May 10, 2017: Brain Topography
https://www.readbyqxmd.com/read/28492124/predicting-postoperative-haemoglobin-changes-after-burn-surgery
#20
Petrus Slabber, Zane Farina, Nikki Allorto, Reitze Nils Rodseth
BACKGROUND: Burn surgery is associated with significant blood loss and fluid shifts that cause rapid haemoglobin (Hb) changes during and after surgery. Understanding the relationship between intraoperative and postoperative (day 1) Hb changes may assist in avoiding postoperative anaemia and unnecessary peri-operative blood transfusion. OBJECTIVE: To describe the Hb changes into the first day after burn surgery and to identify factors predictive of Hb changes that would guide blood transfusion decisions...
April 25, 2017: South African Medical Journal, Suid-Afrikaanse Tydskrif Vir Geneeskunde
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