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https://www.readbyqxmd.com/read/28638561/importance-and-methodologies-of-endodontic-microleakage-studies-a-systematic-review
#1
REVIEW
Farnaz Jafari, Sanaz Jafari
INTRODUCTION: It is very important to obtain a tight seal in obturated root canal, making it necessary to conduct clinical or laboratory studies on the sealability of endodontic materials. Different methodologies have been historically used to assess microleakage of different endodontic materials. The aim of the present study was to comprehensively review different material testing methods used in microleakage studies, their interpretation and importance in endodontic literature. MATERIAL AND METHODS: A systematic search was conducted in Medline, Cochrane, and Web of Science databases...
June 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28638217/diet-in-irritable-bowel-syndrome-what-to-recommend-not-what-to-forbid-to-patients
#2
REVIEW
Anamaria Cozma-Petruţ, Felicia Loghin, Doina Miere, Dan Lucian Dumitraşcu
A substantial proportion of patients with irritable bowel syndrome (IBS) associate their symptoms with the ingestion of specific foods. Therefore, in recent years, scientific research has increasingly focused on the role of diet in IBS and dietary management is now considered an important tool in IBS treatment. This article reviews the main dietary approaches in IBS emphasizing evidence from experimental and observational studies and summarizing the main diet and lifestyle recommendations provided by dietary guidelines and scientific literature...
June 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28617952/systolic-ca-2-i-regulates-diastolic-levels-in-rat-ventricular-myocytes
#3
R Sankaranarayanan, K Kistamas, D J Greensmith, L A Venetucci, D A Eisner
[Ca(2+) ]i must be low enough in diastole so that the ventricle is relaxed and can refill with blood. Interference with this will impair relaxation. The factors responsible for regulation of diastolic [Ca(2+) ]i , in particular the relative roles of the sarcoplasmic reticulum (SR) and surface membrane are unclear. We investigated the effects on diastolic [Ca(2+) ]i that result from the changes of Ca cycling known to occur in heart failure. Experiments were performed using Fluo-3 in voltage-clamped rat ventricular myocytes...
June 15, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28609150/caffeine-use-in-military-personnel-with-ptsd-prevalence-and-impact-on-sleep
#4
Carmen P McLean, Laurie Zandberg, John D Roache, Hayley Fitzgerald, Kristi E Pruiksma, Daniel J Taylor, Katherine A Dondanville, Brett T Litz, Jim Mintz, Stacey Young-McCaughan, Jeffrey S Yarvis, Alan L Peterson, Edna B Foa
BACKGROUND: Caffeine use is highly prevalent among active duty military personnel and can be beneficial to performance in the short term. However, regular caffeine use has been found to contribute to sleep disturbances, which are elevated among the significant number of military personnel with posttraumatic stress disorder (PTSD). The current study is the first to examine caffeine use and its relationship with sleep disturbances in military personnel seeking treatment for PTSD. PARTICIPANTS: Active duty military personnel (N = 366) who had returned from deployments to Afghanistan or Iraq and were seeking treatment for PTSD...
June 13, 2017: Behavioral Sleep Medicine
https://www.readbyqxmd.com/read/28598402/cognitive-performance-enhancement-induced-by-caffeine-carbohydrate-and-guarana-mouth-rinsing-during-submaximal-exercise
#5
Laura Pomportes, Jeanick Brisswalter, Laurence Casini, Arnaud Hays, Karen Davranche
The aim of this study was to investigate the influence of serial mouth rinsing (MR) with nutritional supplements on cognitive performance (i.e., cognitive control and time perception) during a 40-min submaximal exercise. Twenty-four participants completed 4 counterbalanced experimental sessions, during which they performed MR with either placebo (PL), carbohydrate (CHO: 1.6 g/25 mL), guarana complex (GUAc: 0.4 g/25 mL) or caffeine (CAF: 67 mg/25 mL) before and twice during exercise. The present study provided some important new insights regarding the specific changes in cognitive performance induced by nutritional supplements...
June 9, 2017: Nutrients
https://www.readbyqxmd.com/read/28582733/predicting-the-fate-of-micropollutants-during-wastewater-treatment-calibration-and-sensitivity-analysis
#6
Zeina Baalbaki, Elena Torfs, Viviane Yargeau, Peter A Vanrolleghem
The presence of micropollutants in the environment and their toxic impacts on the aquatic environment have raised concern about their inefficient removal in wastewater treatment plants. In this study, the fate of micropollutants of four different classes was simulated in a conventional activated sludge plant using a bioreactor micropollutant fate model coupled to a settler model. The latter was based on the Bürger-Diehl model extended for the first time to include micropollutant fate processes. Calibration of model parameters was completed by matching modelling results with full-scale measurements (i...
June 2, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28569556/guaran%C3%A3-a-highly-caffeinated-food-presents-in-vitro-antitumor-activity-in-colorectal-and-breast-cancer-cell-lines-by-inhibiting-akt-mtor-s6k-and-mapks-pathways
#7
Francine C Cadoná, Jose L Rosa, Taiane Schneider, Monica Cubillos-Rojas, Susana Sánchez-Tena, Verônica F Azzolin, Charles E Assmann, Alencar K Machado, Euler E Ribeiro, Ivana Beatrice M da Cruz
The mammalian target of rapamycin (mTOR) and mitogen-activated protein kinases (MAPKs) pathways are frequently upregulated in cancer. Some authors have reported that some antioxidant molecules could be potential inhibitors of these pathways. Therefore, we investigated the in vitro antitumor effect of guaraná by inhibiting the AKT/mTOR/S6K and MAPKs pathways. Colorectal and breast cancer cell lineages, HT-29 and MCF-7 cells, respectively, were exposed to different guaraná concentrations (0.1, 1, 10, and 100 µg/mL) as well as its main bioactive molecule, caffeine, in proportional concentrations to those found in the extract...
June 1, 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28547666/effects-of-caffeine-intake-prior-to-stress-cardiac-magnetic-resonance-perfusion-imaging-on-regadenoson-versus-adenosine-induced-hyperemia-as-measured-by-t1-mapping
#8
R van Dijk, D Kuijpers, T A M Kaandorp, P R M van Dijkman, R Vliegenthart, P van der Harst, M Oudkerk
The antagonistic effects of caffeine on adenosine receptors are a possible cause of false-negative stress perfusion imaging. The purpose of this study was to determine the effects of coffee intake <4 h prior to stress perfusion cardiac magnetic resonance imaging (CMR) in regadenoson- versus adenosine-induced hyperemia as measured with T1-mapping. 98 consecutive patients with suspected coronary artery disease referred for either adenosine or regadenoson perfusion CMR were included in this analysis. Twenty-four patients reported coffee consumption <4 h before CMR (15 patients with adenosine, and 9 patients with regadenoson); 74 patients reported no coffee intake (50 patients with adenosine, and 24 patients with regadenoson)...
May 25, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28539147/sunlight-exposure-work-hours-caffeine-consumption-and-sleep-duration-in-the-naval-environment
#9
Nita L Shattuck, Panagiotis Matsangas
BACKGROUND: Sailors in the U.S. Navy are habitual shiftworkers, often experiencing circadian misalignment due to their irregular work/rest schedules. This study assessed the effect of sunlight exposure, work hours, and caffeinated beverage consumption on the daily sleep duration of crewmembers of a U.S. Navy ship during a 2-wk underway period. METHODS: Working in an artificially lit area with no access to sunlight during work hours, U.S. Navy crew members (N = 91) used daily logs to report their daily activity, caffeinated beverage consumption, and exposure to sunlight while off-duty; sleep was assessed by wrist-worn actigraphy...
June 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28537195/caffeine-ingestion-acutely-enhances-muscular-strength-and-power-but-not-muscular-endurance-in-resistance-trained-men
#10
Jozo Grgic, Pavle Mikulic
The goal of this randomized, double-blind, cross-over study was to assess the acute effects of caffeine ingestion on muscular strength and power, muscular endurance, rate of perceived exertion (RPE), and pain perception (PP) in resistance-trained men. Seventeen volunteers (mean ± SD: age = 26 ± 6 years, stature = 182 ± 9 cm, body mass = 84 ± 9 kg, resistance training experience = 7 ± 3 years) consumed placebo or 6 mg kg(-1) of anhydrous caffeine 1 h before testing...
May 24, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28536531/caffeine-and-bicarbonate-for-speed-a-meta-analysis-of-legal-supplements-potential-for-improving-intense-endurance-exercise-performance
#11
REVIEW
Peter M Christensen, Yusuke Shirai, Christian Ritz, Nikolai B Nordsborg
A 1% change in average speed is enough to affect medal rankings in intense Olympic endurance events lasting ~45 s to 8 min which for example includes 100 m swimming and 400 m running (~1 min), 1,500 m running and 4000 m track cycling (~4 min) and 2,000 m rowing (~6-8 min). To maximize the likelihood of winning, athletes utilizes legal supplements with or without scientifically documented beneficial effects on performance. Therefore, a continued systematic evidence based evaluation of the possible ergogenic effects is of high importance...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28535819/does-the-placebo-effect-modulate-drug-bioavailability-randomized-cross-over-studies-of-three-drugs
#12
Muhammad M Hammami, Ahmed Yusuf, Faduma S Shire, Rajaa Hussein, Reem Al-Swayeh
BACKGROUND: Medication effect is the sum of its drug, placebo, and drug*placebo interaction effects. It is conceivable that the interaction effect involves modulating drug bioavailability; it was previously observed that being aware of caffeine ingestion may prolong caffeine plasma half-life. This study was set to evaluate such concept using different drugs. METHODS: Balanced single-dose, two-period, two-group, cross-over design was used to compare the pharmacokinetics of oral cephalexin, ibuprofen, and paracetamol, each described by its name (overt) or as placebo (covert)...
May 23, 2017: Journal of Negative Results in Biomedicine
https://www.readbyqxmd.com/read/28534157/infrared-laser-ablation-with-vacuum-capture-for-fingermark-sampling
#13
Fabrizio Donnarumma, Eden E Camp, Fan Cao, Kermit K Murray
Infrared laser ablation coupled to vacuum capture was employed to collect material from fingermarks deposited on surfaces of different porosity and roughness. Laser ablation at 3 μm was performed in reflection mode with subsequent capture of the ejecta with a filter connected to vacuum. Ablation and capture of standards from fingermarks was demonstrated on glass, plastic, aluminum, and cardboard surfaces. Using matrix assisted laser desorption ionization (MALDI), it was possible to detect caffeine after spiking with amounts as low as 1 ng...
May 22, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28518003/caffeine-consumption-among-naval-aviation-candidates
#14
Thomas E Sather, Ronald D Williams, Donald R Delorey, Conrad L Woolsey
INTRODUCTION: Education frequently dictates students need to study for prolonged periods of time to adequately prepare for examinations. This is especially true with aviation preflight indoctrination (API) candidates who have to assimilate large volumes of information in a limited amount of time during API training. The purpose of this study was to assess caffeine consumption patterns (frequency, type, and volume) among naval aviation candidates attending API to determine the most frequently consumed caffeinated beverage and to examine if the consumption of a nonenergy drink caffeinated beverage was related to energy drink consumption...
April 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28515832/a-low-dose-caffeine-and-carbohydrate-supplement-does-not-improve-athletic-performance-during-volleyball-competition
#15
David R Pfeifer, Kelsey M Arvin, Courtney N Herschberger, Nicholas J Haynes, Matthew S Renfrow
Dietary supplements are widely used to enhance sport performance and the combination of carbohydrate and caffeine (CHO+CAF) has yielded particularly high performance gains. Though the effects of a CHO+CAF supplement have been studied in a laboratory environment, little research exists on the effects of supplementation during competition. Therefore, the purpose of this study was to determine the effects of a CHO+CAF supplement on athletic performance in competition. Eight female collegiate volleyball players completed three testing sessions under three different conditions separated by approximately one week each: CHO+CAF supplement, placebo (PBO), and control (CTL) using a randomized, cross-over design...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28515380/highly-selective-and-considerable-subcritical-butane-extraction-to-separate-abamectin-in-green-tea
#16
Yating Zhang, Lingbiao Gu, Fei Wang, Lingjun Kong, Huili Pang, Guangyong Qin
We specially carried out the subcritical butane extraction to separate abamectin from tea leaves. Four parameters, such as extraction temperature, extraction time, number of extraction cycles, and solid-liquid ratio were studied and optimized through the response surface methodology with design matrix developed by Box-Behnken. Seventeen experiments with three various factors and three variable levels were employed to investigate the effect of these parameters on the extraction of abamectin. Besides, catechins, theanine, caffeine, and aroma components were determined by both high-performance liquid chromatography and gas chromatography-mass spectrometry to evaluate the tea quality before and after the extraction...
May 17, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28508377/emulsion-versus-nanoemulsion-how-much-is-the-formulative-shift-critical-for-a-cosmetic-product
#17
Umberto M Musazzi, Silvia Franzè, Paola Minghetti, Antonella Casiraghi
The use of nanoemulsions in cosmetic products has been enlarged in the last decades because of several formulative advantages (e.g., the improved self-life stability, better texture properties). In addition, nanoemulsions seemed to improve the penetration of active ingredients through the human skin, comparing to conventional emulsion. In this contest, the risk of a higher systemic exposure of consumer to active ingredients, due to the ability of nanoemulsion to enhance permeation, results a critical attribute that should be evaluated for assuring the consumer safety...
May 15, 2017: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/28503530/caffeine-supplementation-affects-the-immunometabolic-response-to-concurrent-training
#18
Fabrício Eduardo Rossi, Valéria Leme Gonçalves Panissa, Paula Aulves Monteiro, José Gerosa-Neto, Érico Chagas Caperuto, Jason Michael Cholewa, Alessandro Moura Zagatto, Fábio Santos Lira
The aim of the present study was to investigate the effects of caffeine (CAF) and carbohydrate (CHO) intake on strength performance and its metabolic and inflammatory responses during concurrent training. Seven active males ingested a double-placebo (P), CAF (capsule 5 mg/kg) or CHO (20% maltodextrin solution) supplementation before strength exercise. Participants performed three randomized sessions of 5,000-m high-intensity intermittent aerobic exercise at maximal intensity followed by strength exercise, performing after the P, CHO, and CAF intake...
April 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28501185/simultaneous-voltammetric-determination-of-vanillin-and-caffeine-in-food-products-using-an-anodically-pretreated-boron-doped-diamond-electrode-its-comparison-with-hplc-dad
#19
Hoshyar Saadi Ali, Abdullah A Abdullah, Pınar Talay Pınar, Yavuz Yardım, Zühre Şentürk
This paper describes an electroanalytical method for the simultaneous determination of vanillin (VAN) and caffeine (CAF) using an anodically pretreated boron-doped diamond electrode. Selective determination of one compound in the presence of other one was also realized. Both compounds yielded a single irreversible oxidation peak using cyclic voltammetry. The nature of the electrode reaction was found to be diffusion controlled with contribution of adsorption. By using square-wave adsorptive stripping voltammetry after 60s accumulation under open-circuit voltage, method allowed simultaneous determination of VAN and CAF in phosphate buffer, pH 2...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28498017/dietary-supplements-as-surrogate-of-mediterranean-diet-in-healthy-smoking-subjects
#20
Sonya Vasto, Giulia Accardi, Anna Aiello, Francesca Di Gaudio, Annalisa Barera, Serena Indelicato, Damiano Galimberti, Emilio Italiano, Roberto Monastero, Claudia Rizzo, Calogero Caruso, Giuseppina Candore
The interventions to slow ageing, favouring active life expectancy, represent the new perspectives in ageing investigation. Some mechanisms that delay or prevent the onset of ageing pathologies have been identified. Between them, a healthy lifestyle seems to reduce many risk factors. In particular, eating habits represent the most concrete, low cost way to act on ageing process. Mediterranean diet has received much attention since it has been consistently demonstrated its anti-oxidant and anti-inflammatory effects...
May 12, 2017: Rejuvenation Research
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