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https://www.readbyqxmd.com/read/28623705/counter-ion-transport-number-and-membrane-potential-in-working-membrane-systems
#1
Mette Birch Kristensen, Anders Bentien, Michele Tedesco, Jacopo Catalano
In this work we use the general space-charge (SC) theory for a combined transport model of fluid and ion through cylindrical nanopores to derive equations for the membrane potential and counter-ion transport numbers. We discuss this approach for ion exchange membranes assuming aqueous domains as interconnected network of cylindrical pores. The transport number calculations from the SC theory are compared with the corresponding ones from the uniform potential (UP) and Teorell-Meyer-Sievers (TMS) models in the case of both zero and non-zero concentration gradient across the membrane and with an applied current density...
June 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28616210/acute-kidney-injury-an-overview-of-diagnostic-methods-and-clinical-management
#2
Daniel Hertzberg, Linda Rydén, John W Pickering, Ulrik Sartipy, Martin J Holzmann
Acute kidney injury (AKI) is a common condition in multiple clinical settings. Patients with AKI are at an increased risk of death, over both the short and long term, and of accelerated renal impairment. As the condition has become more recognized and definitions more unified, there has been a rapid increase in studies examining AKI across many different clinical settings. This review focuses on the classification, diagnostic methods and clinical management that are available, or promising, for patients with AKI...
June 2017: Clinical Kidney Journal
https://www.readbyqxmd.com/read/28615646/hydrogen-sulfide-stimulates-cftr-in-xenopus-oocytes-by-activation-of-the-camp-pka-signalling-axis
#3
Alexander Perniss, Kathrin Preiss, Marcel Nier, Mike Althaus
Hydrogen sulfide (H2S) has been recognized as a signalling molecule which affects the activity of ion channels and transporters in epithelial cells. The cystic fibrosis transmembrane conductance regulator (CFTR) is an epithelial anion channel and a key regulator of electrolyte and fluid homeostasis. In this study, we investigated the regulation of CFTR by H2S. Human CFTR was heterologously expressed in Xenopus oocytes and its activity was electrophysiologically measured by microelectrode recordings. The H2S-forming sulphur salt Na2S as well as the slow-releasing H2S-liberating compound GYY4137 increased transmembrane currents of CFTR-expressing oocytes...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28597932/low-cost-zeta-potentiometry-using-solute-gradients
#4
Sangwoo Shin, Jesse T Ault, Jie Feng, Patrick B Warren, Howard A Stone
The zeta potential is an electric potential in the Debye screening layer of an electrolyte, which represents a key physicochemical surface property in various fields ranging from electrochemistry to pharmaceuticals. Thus, characterizing the zeta potential is essential for many applications, but available measurement techniques are limited. Electrophoretic light scattering is typically used to measure the zeta potential of particles in suspension, whereas zeta potential measurements of a solid wall in solution rely on either streaming potential or electroosmotic mobility measurement techniques, both of which are expensive and sophisticated...
June 9, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28593552/a-reformed-surgical-treatment-modality-for-children-with-giant-cystic-craniopharyngioma
#5
Wanchun Zhu, Xiang Li, Jintao He, Tao Sun, Chunde Li, Jian Gong
OBJECTIVE: Surgical removal plays an important role in treating children's craniopharyngioma. For a safe and minimally invasive craniotomy, a reformed surgical modality was proposed in this paper by combining the insertion of an Ommaya reservoir system (ORS) by stereotactic puncture, aspiration of cystic fluid in 2-day interval for consecutive 7-10 days, and the delayed tumor resection. PATIENTS AND METHODS: Eleven patients (aged from 5 to 9 years old) with giant cystic craniopharyngiomas who had undergone the reformed surgical modality during November 2014 and December 2015 were collected as group A...
June 7, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28585150/mild-encephalopathy-encephalitis-with-a-reversible-splenial-lesion-mers-a-report-of-five-neonatal-cases
#6
Dan Sun, Wen-Hong Chen, Suraj Baralc, Juan Wang, Zhi-Sheng Liu, Yuan-Peng Xia, Lei Chen
Mild encephalopathy/encephalitis with a reversible splenial (MERS) lesion is a clinic-radiological entity. The clinical features of MERS in neonates are still not systemically reported. This paper presents five cases of MERS, and the up-to-date reviews of previously reported cases were collected and analyzed in the literature. Here we describe five cases clinically diagnosed with MERS. All of them were neonates and the average age was about 4 days. They were admitted for the common neurological symptoms such as hyperspasmia, poor reactivity and delirium...
June 2017: Journal of Huazhong University of Science and Technology. Medical Sciences
https://www.readbyqxmd.com/read/28580076/postoperative-acute-kidney-injury
#7
REVIEW
Jung Tak Park
Acute kidney injury (AKI) after cardiac surgery is a common and serious complication. Several definitions of AKI have been proposed recently, and include both increases in serum creatinine levels and decreases in urine output as diagnostic criteria. The pathophysiology of postoperative AKI is complex and involves both ischemic injury and systemic inflammation. Identifying risk factors, such as old age, underlying diabetes, heart failure, and obesity, may aid in the application of preventative methods for postoperative AKI...
June 2017: Korean Journal of Anesthesiology
https://www.readbyqxmd.com/read/28573174/optimal-intake-of-clear-liquids-during-preparation-for-afternoon-colonoscopy-with-low-volume-polyethylene-glycol-plus-ascorbic-acid
#8
Masahiro Tajika, Tsutomu Tanaka, Makoto Ishihara, Yutaka Hirayama, Sachiyo Oonishi, Nobumasa Mizuno, Kazuo Hara, Susumu Hijioka, Hiroshi Imaoka, Toshihisa Fujiyoshi, Nobuhiro Hieda, Nozomi Okuno, Tsukasa Yoshida, Kenji Yamao, Vikram Bhatia, Masahiko Ando, Yasumasa Niwa
BACKGROUND AND STUDY AIMS : The standard colonoscopy preparation regimen in Japan for afternoon procedures is sequential intake of 1 L of polyethylene glycol electrolyte lavage solution containing ascorbic acid (PEG-ASC), 0.5 L of clear liquid, 0.5 L of PEG-ASC, and finally 0.25 L of clear fluids (all at a rate of 0.25 L every 15 min). However, this regimen seems poorly tolerated and complicated for many patients compared to previous regimen of polyethylene glycol electrolyte lavage solution...
June 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/28567321/neuropsychiatric-manifestations-in-a-patient-with-panhypopituitarism
#9
Oluwole Jegede, Ajouka Jeyakumar, Thyarapan Balakumar, Alyssa Raghu, Katherine I Chang, Katarina Soewono, Mario Gustave, Ayodeji Jolayemi
We present a case of an incidental diagnosis of panhypopituitarism in a 68-year-old African American man admitted to our psychiatric inpatient unit with symptoms suggestive of schizophrenia. The case was unusual as a first-episode psychosis given the patient's age. In the course of his admission, the patient's clinical condition deteriorated culminating in a sudden altered mental status which prompted a transfer to the medical floors and further investigations. A head CT scan and a pituitary MRI revealed a near total resection of the pituitary while laboratory investigations revealed hyponatremia and a grossly low hormone profile...
2017: Case Reports in Psychiatry
https://www.readbyqxmd.com/read/28553873/does-fluid-resuscitation-with-balanced-solutions-induce-electrolyte-and-metabolic-abnormalities-an-in-vitro-assessment
#10
Łukasz J Krzych, Piotr F Czempik
BACKGROUND: Popular intravenous fluids in clinical use may have impact on electrolyte concentration and metabolic balance and should be considered as powerful pharmacologic agents. There is growing body of evidence that fluid therapy should be more individualized and preferably based on balanced solutions. AIM: We sought to investigate impact of three commonly used balanced fluids on electrolytes and metabolic equilibrium in an in vitro setting. METHODS: Study group comprised 32 healthy male volunteers (no history of any acute/chronic disorder or known metabolic abnormalities), aged 21-35 (29 ± 4) years, weighting 59-103 (81...
May 29, 2017: Kardiologia Polska
https://www.readbyqxmd.com/read/28547320/real-time-noninvasive-monitoring-of-intracranial-fluid-shifts-during-dialysis-using-volumetric-integral-phase-shift-spectroscopy-vips-a-proof-of-concept-study
#11
Chethan P Venkatasubba Rao, Eric M Bershad, Eusebia Calvillo, Nelson Maldonado, Rahul Damani, Sreedhar Mandayam, Jose I Suarez
BACKGROUND: Cerebral edema, which is associated with increased intracranial fluid, is often a complication of many acute neurological conditions. There is currently no accepted method for real-time monitoring of intracranial fluid volume at the bedside. We evaluated a novel noninvasive technique called "Volumetric Integral Phase-shift Spectroscopy (VIPS)" for detecting intracranial fluid shifts during hemodialysis. METHODS: Subjects receiving scheduled hemodialysis for end-stage renal disease and without a history of major neurological conditions were enrolled...
May 25, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/28533010/initial-investigation-of-the-corrosion-stability-of-craniofacial-implants
#12
Thamara Beline, Aljomar José Vechiato Filho, Alvin G Wee, Cortino Sukotjo, Daniela Micheline Dos Santos, Thaís Bianca Brandão, Valentim Adelino Ricardo Barão
STATEMENT OF PROBLEM: Although craniofacial implants have been used for retention of facial prostheses, failures are common. Titanium undergoes corrosion in the oral cavity, but the corrosion of craniofacial implants requires evaluation. PURPOSE: The purpose of this in vitro study was to investigate the corrosion stability of commercially pure titanium (CP Ti) exposed to simulated human perspiration at 2 different pH levels (5.5 and 8). MATERIAL AND METHODS: Fifteen titanium disks were divided into 3 groups (n=5 per group)...
May 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28532043/microarc-oxidation-discharge-types-and-bio-properties-of-the-coating-synthesized-on-zirconium
#13
Sezgin Cengiz, Yunus Azakli, Mehmet Tarakci, Lia Stanciu, Yucel Gencer
This study is an attempt for gaining a better understanding on relationship between microarc oxidation (MAO) coating discharge types and bioactivity of an oxide-based coating synthesized on a Zr substrate. The discharge types and the coating growth mechanism were identified by the examination of the real cross-section image of the coating microstructure. The coating was conducted by using MAO in an electrolyte containing Na2SiO3, Ca(CH3COO)2 and C3H7Na2O6P, for different durations of 2.5, 5, 15, and 30mins...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28527586/gastrointestinal-bowel-obstruction-in-acute-ischemic-stroke-incidence-risk-factors-and-outcomes-in-a-u-s-nationwide-analysis-of-3-998-667-hospitalizations
#14
Kavelin Rumalla, Ashwath S Kumar, Manoj K Mittal
OBJECTIVE: The prognosis from acute ischemic stroke (AIS) is worsened by poststroke medical complications. The incidence, risk factors, and outcomes of gastrointestinal bowel obstruction (GIBO) in AIS are not known. METHODS: We queried the Nationwide Inpatient Sample (2002-2011) to identify all patients with a primary diagnosis of AIS and subsets with and without a secondary diagnosis of GIBO without hernia. Multivariable analysis was utilized to identify risk factors for GIBO in AIS patients and the association between GIBO, in-hospital complications, and outcomes...
May 17, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28520883/effect-of-isotonic-versus-hypotonic-maintenance-fluid-therapy-on-urine-output-fluid-balance-and-electrolyte-homeostasis-a-crossover-study-in-fasting-adult-volunteers
#15
N Van Regenmortel, T De Weerdt, A H Van Craenenbroeck, E Roelant, W Verbrugghe, K Dams, M L N G Malbrain, T Van den Wyngaert, P G Jorens
Background.: Daily and globally, millions of adult hospitalized patients are exposed to maintenance i.v. fluid solutions supported by limited scientific evidence. In particular, it remains unclear whether fluid tonicity contributes to the recently established detrimental effects of fluid, sodium, and chloride overload. Methods.: This crossover study consisted of two 48 h study periods, during which 12 fasting healthy adults were treated with a frequently prescribed solution (NaCl 0...
June 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28497827/a-dsdna-model-optimized-for-electrokinetic-applications
#16
Tobias Rau, Florian Weik, Christian Holm
We present a coarse-grained (CG) model of a charged double-stranded DNA immersed in an electrolyte solution that can be used for a variety of electrokinetic applications. The model is based on an earlier rigid and immobile model of Weik et al. and includes now semi-flexibility and mobility, so that DNA dynamics can be sufficiently captured to simulate a full nanopore translocation process. To this end we couple the DNA hydrodynamically via a raspberry approach to a lattice-Boltzmann fluid and parametrize the counterions with a distant dependent friction...
May 31, 2017: Soft Matter
https://www.readbyqxmd.com/read/28492352/the-physiological-incubation-biosimulator-pibs-an-improved-ex-vivo-experimental-setup-for-the-mechanical-stability-of-biological-sealants-in-surgical-procedures
#17
Philipp Höhn, Marie Buchholz, Britta Majchrzak, Waldemar Uhl, Chris Braumann, Ansgar M Chromik
BACKGROUND: Tissue-bound fibrin sealants are used in a wide array of surgical procedures. The microenvironmental interaction between sealant and application site is often poorly evaluated due to a lack of suitable experimental models. METHODS: A physiological incubation biosimulator (PIBS) was developed to test biological sealants in an ex vivo setup under physiological conditions comparable to the microenvironment at application site (temperature, humidity, pressure)...
June 2017: Surgical Innovation
https://www.readbyqxmd.com/read/28483328/clinical-classification-of-adult-patients-with-chronic-intestinal-failure-due-to-benign-disease-an-international-multicenter-cross-sectional-survey
#18
Loris Pironi, Denise Konrad, Chrisoffer Brandt, Francisca Joly, Geert Wanten, Federica Agostini, Cecile Chambrier, Umberto Aimasso, Sarah Zeraschi, Darlene Kelly, Kinga Szczepanek, Amelia Jukes, Simona Di Caro, Miriam Theilla, Marek Kunecki, Joanne Daniels, Mireille Serlie, Florian Poullenot, Jian Wu, Sheldon C Cooper, Henrik H Rasmussen, Charlene Compher, David Seguy, Adriana Crivelli, Maria C Pagano, Sarah-Jane Hughes, Francesco W Guglielmi, Nada Rotovnik Kozjek, Stéphane M Schneider, Lyn Gillanders, Lars Ellegard, Ronan Thibault, Przemysław Matras, Anna Zmarzly, Konrad Matysiak, Andrè Van Gossum, Alastair Forbes, Nicola Wyer, Marina Taus, Nuria M Virgili, Margie O'Callaghan, Brooke Chapman, Emma Osland, Cristina Cuerda, Peter Sahin, Lynn Jones, Andre D W Lee, Valentino Bertasi, Paolo Orlandoni, Ferenc Izbéki, Corrado Spaggiari, Marta Bueno Díez, Maryana Doitchinova-Simeonova, Carmen Garde, Aurora E Serralde-Zúñiga, Gabriel Olveira, Zeljko Krznaric, Laszlo Czako, Gintautas Kekstas, Alejandro Sanz-Paris, Estrella Petrina Jáuregui, Ana Zugasti Murillo, Eszter Schafer, Jann Arends, José P Suárez-Llanos, Jon Shaffer, Simon Lal
BACKGROUND & AIMS: The aim of the study was to evaluate the applicability of the ESPEN 16-category clinical classification of chronic intestinal failure, based on patients' intravenous supplementation (IVS) requirements for energy and fluids, and to evaluate factors associated with those requirements. METHODS: ESPEN members were invited to participate through ESPEN Council representatives. Participating centers enrolled adult patients requiring home parenteral nutrition for chronic intestinal failure on March 1st 2015...
April 19, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28473256/malnutrition-among-hospitalized-children-in-the-united-states-changing-prevalence-clinical-correlates-and-practice-patterns-between-2002-and-2011
#19
Jennifer Carvalho-Salemi, Jason L Salemi, Molly R Wong-Vega, Kiara K Spooner, Marisa D Juarez, Stacey S Beer, Nicki L Canada
BACKGROUND: Pediatric malnutrition has been associated with adverse clinical outcomes, longer lengths of stay, and higher health care costs. OBJECTIVE: To characterize prevalence, temporal trends, and short-term clinical outcomes of coded diagnoses of pediatric malnutrition (CDM) across sociodemographic, clinical, and hospital characteristics from 2002 to 2011. DESIGN: This study is a retrospective cross-sectional analysis of nationally representative data from the Nationwide Inpatient Sample and the Kids' Inpatient Database...
April 28, 2017: Journal of the Academy of Nutrition and Dietetics
https://www.readbyqxmd.com/read/28473024/-prehospital-arterial-blood-gas-analysis-after-collapse-connected-to-triathlon-participation
#20
Asbjørn Ettrup-Christensen, Louise Amstrup-Hansen, Stine T Zwisler
Long-distance athletes are at risk of serious fluid and electrolyte disturbances, such as hypernatraemia (dehydration). Recently, cases of serious morbidity have been reported, due to acute exercise-associated hyponatraemia, which can advance to encephalopathy. An arterial blood gas analysis (ABG) was drawn from collapsed athletes at the championship of full-distance triathlon 2015, and different electrolyte imbalances were found. Our findings show that prehospital ABG can assist in differentiating the cause of collapse, and presumably, targeted treatment can be initiated already on scene...
May 1, 2017: Ugeskrift for Laeger
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