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https://www.readbyqxmd.com/read/28340309/analytical-techniques-in-lipidomics-state-of-the-art
#1
Kamil Jurowski, Kamila Kochan, Justyna Walczak, Małgorzata Barańska, Wojciech Piekoszewski, Bogusław Buszewski
Current studies related to lipid identification and determination, or lipidomics in biological samples, are one of the most important issues in modern bioanalytical chemistry. There are many articles dedicated to specific analytical strategies used in lipidomics in various kinds of biological samples. However, in such literature, there is lack of articles dedicated to a comprehensive review of the actual analytical methodologies used in lipidomics. The aim of this article is to characterize the lipidomics methods used in modern bioanalysis according to the methodological point of view: 1) chromatography/separation methods, 2) spectroscopic methods and 3) mass spectrometry and also hyphenated methods...
March 24, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28339713/evaluation-of-the-effectiveness-of-intermittent-mechanical-pressure-with-short-loading-duration-new-type-of-intermittent-force-for-orthodontic-treatment
#2
Kento Shoman, Yoshiaki Sato, Eisuke Nishikawa, Yuusuke Kudo, Takaaki Yamamoto, Junichiro Iida
Background: Since it is difficult to precisely control the magnitude of force in orthodontic practice, controlling the duration of force is expected to prevent tissue damage. The use of an actuator as an appliance for intermittent force application is a possible solution for controlling the duration. However, effectiveness of an actuator for controlling the duration is still not clear. Aim: To determine whether a short loading duration of intermittent force has the potential to maintain a sound condition of the capillaries and induce dilation of capillaries, which is a requisite phenomenon for orthodontic tooth movement...
February 22, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28333326/new-high-dose-pulsed-hyaluronidase-protocol-for-hyaluronic-acid-filler-vascular-adverse-events
#3
Claudio DeLorenzi
The purpose of this article is to update the changes to the author's protocols used to manage acute filler related vascular events from those previously published in this journal. For lack of a better term, this new protocol has been called the High Dose Pulsed Hyaluronidase (HDPH) protocol for vascular embolic events with hyaluronic acid (HA) fillers. The initial protocol used involved many different modalities of treatment. The current protocol is exceedingly simple and involves solely the use of hyaluronidase in repeated high doses...
March 17, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/28333171/dual-dimensional-nanostructures-with-highly-durable-non-wetting-properties-under-dynamic-and-underwater-conditions
#4
Seunghyeon Baek, Wuseok Kim, Sangmin Jeon, Kijung Yong
Non-wetting states with high durability under both dynamic and underwater conditions are very desirable for practical applications of superhydrophobic surfaces in various fields. Despite increasing demands for this dual stability of non-wetting surfaces, studies investigating both the impact dynamics and underwater stability are very rare. In the current study, we performed water droplet impact dynamics and underwater stability studies using ZnO/Si hierarchical nanostructures (HNs) as a model system. The effects of the surface structure on the non-wetting states under dynamic conditions were first studied by comparing various surface structures, such as ZnO nanowires (NWs), Si microposts (MPs), ZnO/Si HNs with controlled MP interspacings, and lotus leaf (LL)...
March 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28329155/pulmonary-arterial-stiffness-indices-assessed-by-intravascular-ultrasound-in-children-with-early-pulmonary-vascular-disease-prediction-of-advanced-disease-and-mortality-during-20-year-follow-up
#5
Mark-Jan Ploegstra, Jody G M Brokelman, Jolien W Roos-Hesselink, Johannes M Douwes, Lenny M van Osch-Gevers, Elke S Hoendermis, Annemien E van den Bosch, Maarten Witsenburg, Beatrijs Bartelds, Hans L Hillege, Rolf M F Berger
Aims: Prognosis in children with pulmonary vascular disease (PVD) is closely linked to right ventricular (RV) failure due to increased RV-afterload. Pulmonary arterial (PA) stiffening is known to occur early in the course of PVD and constitutes a main component of RV-afterload. This study aimed to evaluate the clinical value of PA-stiffness in children with PVD by determining its association with advanced pulmonary arterial hypertension (PAH) and mortality at long-term follow-up. Methods and results: Forty-one children with various stages of arterial PVD, defined as mean PA-pressure  ≥20 mmHg and/or pulmonary-to-systemic flow-ratio  ≥1...
March 6, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28328019/dopant-assisted-direct-analysis-in-real-time-mass-spectrometry-with-argon-gas
#6
Robert B Cody, A John Dane
RATIONALE: Dopants used with Atmospheric Pressure Photoionization (APPI) were examined with the Direct Analysis in Real Time (DART(®) ) ion source operated with argon gas. Charge-exchange and proton transfer reactions were observed by adding toluene, anisole, chlorobenzene and acetone to the DART gas stream, complementing the information obtained by helium DART. METHODS: Mass spectra were acquired with a time-of-flight mass spectrometer equipped with a DART ion source operated with argon gas...
May 30, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28323178/study-on-the-deformations-of-the-lamina-cribrosa-during-glaucoma
#7
Hanjing Tian, Long Li, Fan Song
The lamina cribrosa is the primary site of optic nerve injury during glaucoma, and its deformations induced by elevated intraocular pressure are associated directly with the optic nerve injury and visual field defect. However, the deformations in a living body have been poorly understood yet so far. It is because that integral observation and precise measurement of the deformations in vivo are now almost impossible in the clinical diagnosis and treatment of glaucoma. In the present study, a new mechanical model of the lamina cribrosa is presented by using Reissner's thin plate theory...
March 18, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28321811/interleukin-2-old-and-new-approaches-to-enhance-immune-therapeutic-efficacy
#8
Pooja Dhupkar, Nancy Gordon
Interleukin-2 (IL-2) is a very well-known cytokine that has been studied for the past 35 years. It plays a major role in the growth and proliferation of many immune cells such NK and T cells. It is an important immunotherapy cytokine for the treatment of various diseases including cancer. Systemic delivery of IL-2 has shown clinical benefit in renal cell carcinoma and melanoma patients. However, its use has been limited by the numerous toxicities encountered with the systemic delivery. Intravenous IL-2 causes the well-known "capillary leak syndrome," or the leakage of fluid from the circulatory system to the interstitial space resulting in hypotension (low blood pressure), edema, and dyspnea that can lead to circulatory shock and eventually cardiopulmonary collapse and multiple organ failure...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28316980/clinical-and-prognostic-significance-of-positive-hepatojugular-reflux-on-discharge-in-acute-heart-failure-insights-from-the-escape-trial
#9
Hesham R Omar, Maya Guglin
Background. There has been a decline in emphasis of the value of physical examination in heart failure (HF) with increased reliance on cardiac imaging. We aim to study the clinical and prognostic significance of positive hepatojugular reflux (HJR) on discharge in patients hospitalized with HF. Methods. Using the ESCAPE trial data, patients were compared according to the presence or absence of a positive HJR on discharge. The primary study endpoints were all-cause mortality and a composite endpoint of death, rehospitalization, and cardiac transplant during the first 6 months after discharge...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28316089/optimal-mems-device-for-mobility-and-zeta-potential-measurements-using-dc-electrophoresis
#10
Pascal Karam, Andrei Dukhin, Sumita Pennathur
We have developed a novel microchannel geometry that allows us to perform simple DC electrophoresis to measure the electrophoretic mobility and zeta potential of analytes and particles. In standard capillary geometries, mobility measurements using DC fields are difficult to perform. Specifically, measurements in open capillaries require knowledge of the hard to measure and often dynamic wall surface potential. Although measurements in closed capillaries eliminate this requirement, the measurements must be performed at infinitesimally small regions of zero flow where the pressure driven-flow completely cancels the electroosmotic flow (Komagata Planes)...
March 18, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28315502/the-effect-of-left-ventricular-assist-device-therapy-in-patients-with-heart-failure-and-mixed-pulmonary-hypertension
#11
Hoong S Lim, Neil Howell, Aaron Ranasinghe
BACKGROUND: Diastolic pressure gradient (DPG) of ≥7 mmHg has been proposed to distinguish mixed pulmonary hypertension from isolated post-capillary pulmonary hypertension in heart failure (HF). We evaluated the changes in pulmonary hemodynamics with left ventricular assist devices (LVADs) in patients with DPG of ≥7 or <7 mmHg, and effects on peak oxygen uptake (VO2) in patients with advanced HF. METHODS: Pre- and post-LVAD implant pulmonary hemodynamics (including right atrial (RA) pressures, DPG, pulmonary vascular resistance (PVR), pulmonary capacitance (PCap) and cardiac output), echocardiography, cardiopulmonary exercise test were measured in 38 consecutive patients...
March 16, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28300644/the-connective-tissue-phenotype-of-glaucomatous-cupping-in-the-monkey-eye-clinical-and-research-implications
#12
REVIEW
Hongli Yang, Juan Reynaud, Howard Lockwood, Galen Williams, Christy Hardin, Luke Reyes, Cheri Stowell, Stuart K Gardiner, Claude F Burgoyne
In a series of previous publications we have proposed a framework for conceptualizing the optic nerve head (ONH) as a biomechanical structure. That framework proposes important roles for intraocular pressure (IOP), IOP-related stress and strain, cerebrospinal fluid pressure (CSFp), systemic and ocular determinants of blood flow, inflammation, auto-immunity, genetics, and other non-IOP related risk factors in the physiology of ONH aging and the pathophysiology of glaucomatous damage to the ONH. The present report summarizes 20 years of technique development and study results pertinent to the characterization of ONH connective tissue deformation and remodeling in the unilateral monkey experimental glaucoma (EG) model...
March 12, 2017: Progress in Retinal and Eye Research
https://www.readbyqxmd.com/read/28295946/feasibility-and-interpretation-of-global-longitudinal-strain-imaging-in-pediatric-heart-transplant-recipients
#13
Bethany L Wisotzkey, Neal W Jorgensen, Erin L Albers, Mariska S Kemna, Robert J Boucek, Richard A Kronmal, Yuk M Law, Aarti H Bhat
Evaluation of myocardial mechanics after heart transplant is important in monitoring allograft function and identifying rejection. Speckle tracking global longitudinal strain (GLS) may be more sensitive to early regional changes from rejection. This study aimed to determine feasibility of GLS in pediatric hearts during surveillance echocardiograms, compare their GLS to published norms (-18% to -22%), and assess association of GLS with other indices of graft function. Retrospective review of transplant echocardiograms from 2013 to 2014...
March 10, 2017: Pediatric Transplantation
https://www.readbyqxmd.com/read/28287506/assessment-of-pulmonary-capillary-blood-volume-membrane-diffusing-capacity-and-intrapulmonary-arteriovenous-anastomoses-during-exercise
#14
Vincent Tedjasaputra, Sean van Diepen, Sophie É Collins, Wade M Michaelchuk, Michael K Stickland
Exercise is a stress to the pulmonary vasculature. With incremental exercise, the pulmonary diffusing capacity (DLCO) must increase to meet the increased oxygen demand; otherwise, a diffusion limitation may occur. The increase in DLCO with exercise is due to increased capillary blood volume (Vc) and membrane diffusing capacity (Dm). Vc and Dm increase secondary to the recruitment and distension of pulmonary capillaries, increasing the surface area for gas exchange and decreasing pulmonary vascular resistance, thereby attenuating the increase in pulmonary arterial pressure...
February 20, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28283997/decision-support-system-for-detection-of-papilledema-through-fundus-retinal-images
#15
Shahzad Akbar, Muhammad Usman Akram, Muhammad Sharif, Anam Tariq, Ubaid Ullah Yasin
A condition in which the optic nerve inside the eye is swelled due to increased intracranial pressure is known as papilledema. The abnormalities due to papilledema such as opacification of Retinal Nerve Fiber Layer (RNFL), dilated optic disc capillaries, blurred disc margins, absence of venous pulsations, elevation of optic disc, obscuration of optic disc vessels, dilation of optic disc veins, optic disc splinter hemorrhages, cotton wool spots and hard exudates may result in complete vision loss. The ophthalmologists detect papilledema by means of an ophthalmoscope, Computed Tomography (CT), Magnetic Resonance Imaging (MRI) and ultrasound...
April 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/28281659/atmospheric-pressure-chemical-ionization-gas-chromatography-mass-spectrometry-for-the-analysis-of-selected-emerging-brominated-flame-retardants-in-foods
#16
Surong Lv, Yumin Niu, Jing Zhang, Bing Shao, Zhenxia Du
Emerging brominated flame retardants (eBFRs) other than polybrominated diphenyl ethers (PBDEs), polybrominated biphenyls (PBBs) and their derivatives in foods have been in focus in recent years due to their increasing production volumes, indefinite information on toxicities and the lack of data on occurrence in environments, foods as well as humans. In this study, gas chromatography was coupled to an atmospheric pressure chemical ionization-tandem mass spectrometry (APGC-MS/MS) for the analysis of six eBFRs in pork, chicken, egg, milk and fish...
March 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28274817/microvascular-nadph-oxidase-in-health-and-disease
#17
REVIEW
Yao Li, Patrick J Pagano
The systemic and cerebral microcirculation contribute critically to regulation of local and global blood flow and perfusion pressure. Microvascular dysfunction, commonly seen in numerous cardiovascular pathologies, is associated with alterations in the oxidative environment including potentiated production of reactive oxygen species (ROS) and subsequent activation of redox signaling pathways. NADPH oxidases (Nox) are a primary source of ROS in the vascular system and play a central role in cardiovascular health and disease...
March 5, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28274560/antithrombin-iii-is-associated-with-acute-liver-failure-in-patients-with-end-stage-heart-failure-undergoing-mechanical-circulatory-support
#18
Judith Hoefer, Hanno Ulmer, Juliane Kilo, Raimund Margreiter, Michael Grimm, Peter Mair, Elfriede Ruttmann
OBJECTIVE: There are few data on the role of liver dysfunction in patients with end-stage heart failure supported by mechanical circulatory support. The aim of our study was to investigate predictors for acute liver failure in patients with end-stage heart failure undergoing mechanical circulatory support. METHODS: A consecutive 164 patients with heart failure with New York Heart Association class IV undergoing mechanical circulatory support were investigated for acute liver failure using the King's College criteria...
February 9, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28270838/clinical-and-hemodynamic-profiles-of-elderly-patients-with-pulmonary-arterial-hypertension-a-single-center-prospective-study
#19
Ebru Ozpelit, Bahri Akdeniz, Dilek Sezgin, Can Sevinc, Kemal Can Tertemiz, Mehmet Emre Ozpelit, Mustafa Baris, Nezihi Baris
BACKGROUNDS: Pulmonary arterial hypertension (PAH) was previously considered an illness that affects mostly the young, but now it is also increasingly recognized in the elderly. The aim of this study was to compare the features of elderly versus younger patients diagnosed with PAH, and to define the prognostic factors which affect their long-term survival. METHODS: In this prospective, single center study, the clinical, echocardiographic, hemodynamic characteristics, and the outcomes of younger (18-65 years) and elderly (≥ 65 years) patients with definitive diagnosis of precapillary PAH were compared...
January 2017: Journal of Geriatric Cardiology: JGC
https://www.readbyqxmd.com/read/28270772/lack-of-abcg2-leads-to-biventricular-dysfunction-and-remodeling-in-response-to-hypoxia
#20
Bence M Nagy, Chandran Nagaraj, Bakytbek Egemnazarov, Grazyna Kwapiszewska, Rudolf E Stauber, Alexander Avian, Horst Olschewski, Andrea Olschewski
Aims: The ATP-binding cassette (ABC)G2 transporter protects the heart from pressure overload-induced ventricular dysfunction but also protects cancer cells from chemotherapeutic agents. It is upregulated in the myocardium of heart failure patients and clears hypoxia-induced intracellular metabolites. This study employs ABCG2 knockout (KO) mice to elucidate the relevance of ABCG2 for cardiac and pulmonary vascular structure and function in chronic hypoxia, and uses human primary cardiac fibroblasts to investigate the potential role of ABCG2 in cardiac fibrosis...
2017: Frontiers in Physiology
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