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https://www.readbyqxmd.com/read/29454105/assessing-the-repeatability-of-absolute-cmro-2-oef-and-haemodynamic-measurements-from-calibrated-fmri
#1
Alberto Merola, Michael A Germuska, Kevin Murphy, Richard G Wise
As energy metabolism in the brain is largely oxidative, the measurement of cerebral metabolic rate of oxygen consumption (CMRO 2 ) is a desirable biomarker for quantifying brain activity and tissue viability. Currently, PET techniques based on oxygen isotopes are the gold standard for obtaining whole brain CMRO 2 maps. Among MRI techniques that have been developed as an alternative are dual calibrated fMRI (dcFMRI) methods, which exploit simultaneous measurements of BOLD and ASL signals during a hypercapnic-hyperoxic experiment to modulate brain blood flow and oxygenation...
February 14, 2018: NeuroImage
https://www.readbyqxmd.com/read/29454097/improving-sustained-drug-delivery-from-ophthalmic-lens-materials-through-the-control-of-temperature-and-time-of-loading
#2
Ana Topete, Andreia S Oliveira, A Fernandes, T G Nunes, A P Serro, B Saramago
Although the possibility of using drug-loaded ophthalmic lens to promote sustained drug release has been thoroughly pursued, there are still problems to be solved associated to the different alternatives. In this work, we went back to the traditional method of drug loading by soaking in the drug solution and tried to optimize the release profiles by changing the temperature and the time of loading. Two materials commercially available under the names of CI26Y and Definitive 50 were chosen. CI26Y is used for intraocular lenses (IOLs) and Definitive 50 for soft contact lenses (SCLs)...
February 14, 2018: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29453910/advanced-spectrophotometric-chemometric-methods-for-resolving-the-binary-mixture-of-doxylamine-succinate-and-pyridoxine-hydrochloride
#3
Plamen Katsarov, Georgi Gergov, Aylin Alin, Bissera Pilicheva, Yahya Al-Degs, Vasil Simeonov, Margarita Kassarova
The prediction power of partial least squares (PLS) and multivariate curve resolution-alternating least squares (MCR-ALS) methods have been studied for simultaneous quantitative analysis of the binary drug combination - doxylamine succinate and pyridoxine hydrochloride. Analysis of first-order UV overlapped spectra was performed using different PLS models - classical PLS1 and PLS2 as well as partial robust M-regression (PRM). These linear models were compared to MCR-ALS with equality and correlation constraints (MCR-ALS-CC)...
March 1, 2018: Acta Pharmaceutica
https://www.readbyqxmd.com/read/29453839/making-policies-about-emerging-technologies
#4
Gregory E Kaebnick, Michael K Gusmano
Can we make wise policy decisions about still-emerging technologies-decisions that are grounded in facts yet anticipate unknowns and promote the public's preferences and values? There is a widespread feeling that we should try. There also seems to be widespread agreement that the central element in wise decisions is the assessment of benefits and costs, understood as a process that consists, at least in part, in measuring, tallying, and comparing how different outcomes would affect the public interest. But how benefits and costs are best weighed when making decisions about whether to move forward with an emerging technology is not clear...
January 2018: Hastings Center Report
https://www.readbyqxmd.com/read/29453838/from-cba-to-precautionary-appraisal-practical-responses-to-intractable-problems
#5
Andrew Stirling, Josie Coburn
The purpose of this essay is to critically review the design of methods for ethically robust forms of technology appraisal in the regulation of research and innovation in synthetic biology. It will focus, in particular, on the extent to which cost-benefit analysis offers a basis for informing decisions about which technological pathways to pursue and which to discourage. A further goal is to consider what (if anything) the precautionary principle might offer in enabling better decisions. And this, in turn, raises questions about why mention of precaution can excite accusations of unscientific bias or irrational, "anti-innovation" extremism...
January 2018: Hastings Center Report
https://www.readbyqxmd.com/read/29453836/cba-and-precaution-policy-making-about-emerging-technologies
#6
Gregory E Kaebnick, Michael K Gusmano
In the technology assessment literature, the leading alternative to CBA-like methods is usually held to be precaution, which is understood in various ways but is always about making decisions under conditions of uncertainty. Under such conditions, proponents of precaution commonly hold, a straightforward tallying of potential outcomes does not seem possible. Since CBA aims to tally up outcomes to determine which outcome would produce the greatest public benefit, precaution begins to look like, not just an alternative to CBA, but an incompatible alternative...
January 2018: Hastings Center Report
https://www.readbyqxmd.com/read/29453831/evaluation-of-a-recombinant-multiepitope-antigen-for-diagnosis-of-hepatitis-c-virus-a-lower-cost-alternative-for-antigen-production
#7
Ronaldo Luis Thomasini, Hortencia Gisele Amaro Souza, Oscar Bruna-Romero, Antonio Helvecio Totola, Neiva Sellan Lopes Gonçales, Cristiano Xavier Lima, Mauro Martins Teixeira
BACKGROUND: The most of the hepatitis C-infected patients remain undiagnosed until they develop severe liver damage or submitted for serological screening. OBJECTIVE: To evaluate a recombinant multiepitope protein for detection of IgG anti-hepatitis C virus. METHOD: A synthetic gene was cloned, expressed in Escherichia coli, and the recombinant protein was purified. Human serum panel consisted of 88 positives (20 HCV genotyped) and 376 negatives for hepatitis C, 6 positives for human acquired immunodeficiency virus, 6 syphilis positives, 6 hepatitis B positives were tested by IgG antihepatitis C virus using the protein by enzyme-linked immunosorbent assay...
February 17, 2018: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/29453688/rapid-optimization-of-spore-production-from-bacillus-amyloliquefaciens-in-submerged-cultures-based-on-dipicolinic-acid-fluorimetry-assay
#8
Hang Ren, Ya-Ting Su, Xiao-Hua Guo
Some optimization techniques have been widely applied for spore fermentation based on the plate counting. This study optimized the culture medium for the spore production of Bacillus amyloliquefaciens BS-20 and investigated the feasibility of using a dipicolonic acid (DPA) fluorimetry assay as a simpler alternative to plate counting for evaluating spore yields. Through the single-factor experiment, the metal ions and agro-industrial raw materials that significantly enhanced spore production were determined...
February 16, 2018: AMB Express
https://www.readbyqxmd.com/read/29453632/microbiota-in-fermented-feed-and-swine-gut
#9
REVIEW
Cheng Wang, Changyou Shi, Yu Zhang, Deguang Song, Zeqing Lu, Yizhen Wang
Development of alternatives to antibiotic growth promoters (AGP) used in swine production requires a better understanding of their impacts on the gut microbiota. Supplementing fermented feed (FF) in swine diets as a novel nutritional strategy to reduce the use of AGP and feed price, can positively affect the porcine gut microbiota, thereby improving pig productivities. Previous studies have noted the potential effects of FF on the shift in benefit of the swine microbiota in different regions of the gastrointestinal tract (GIT)...
February 16, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29453513/simultaneous-cell-disruption-and-lipid-extraction-of-wet-aurantiochytrium-sp-krs101-using-a-high-shear-mixer
#10
Minsoo Kwak, Seul Gi Kang, Won-Kyung Hong, Jong-In Han, Yong Keun Chang
Microalgae are regarded as a promising source of biofuels, and the concept of a microalgae-based biorefinery has attracted increasing attention in recent years. From an economic perspective, however, the process remains far from competitive with fossil fuels. This is particularly true of lipid extraction, due in part to the energy-intensive drying step. As a result, wet extraction methods have been studied as an economic alternative. In the present study, a novel extraction approach which utilizes high shear stress mixing was adopted and demonstrated for simultaneous lipid extraction and cell disruption to enable the retrieval of lipids directly from concentrated wet biomass...
February 16, 2018: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29453474/fingerprints-as-an-alternative-method-to-determine-abo-and-rh-blood-groups
#11
Sonam Chaudhary, Sajana Deuja, Munna Alam, Poonam Karmacharya, Monami Mondal
INTRODUCTION: Blood grouping is conventionally done with invasive method by taking blood samples. The objective of this study is to determine blood group with uninvasive procedure by taking fingerprints of the participants and know the associations between their fingerprints and blood groups. METHODS: Seven hundred participants of both genders with no any age limitation from Manipal Teaching Hospital and Manipal College of Medical Sciences were randomly selected...
October 2017: JNMA; Journal of the Nepal Medical Association
https://www.readbyqxmd.com/read/29453389/toxicity-classification-of-oxide-nanomaterials-effects-of-data-gap-filling-and-pchem-score-based-screening-approaches
#12
My Kieu Ha, Tung Xuan Trinh, Jang Sik Choi, Desy Maulina, Hyung Gi Byun, Tae Hyun Yoon
Development of nanotoxicity prediction models is becoming increasingly important in the risk assessment of engineered nanomaterials. However, it has significant obstacles caused by the wide heterogeneities of published literature in terms of data completeness and quality. Here, we performed a meta-analysis of 216 published articles on oxide nanoparticles using 14 attributes of physicochemical, toxicological and quantum-mechanical properties. Particularly, to improve completeness and quality of the extracted dataset, we adapted two preprocessing approaches: data gap-filling and physicochemical property based scoring...
February 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29453257/a-facile-arsenazo-iii-based-assay-for-monitoring-rare-earth-element-depletion-from-cultivation-media-of-methanotrophic-and-methylotrophic-bacteria
#13
Carmen Hogendoorn, Paula Roszczenko-Jasińska, N Cecilia Martinez-Gomez, Johann de Graaff, Patrick Grassl, Arjan Pol, Huub J M Op den Camp, Lena J Daumann
Recently, methanotrophic and methylotrophic bacteria were found to utilize rare earth elements (REE). To monitor the REE-content in culture media of these bacteria we have developed a rapid screening method using the Arsenazo III (AS III) dye for spectrophotometric REE-detection in the low μM (0.1-10 μM) range. We designed this assay to follow La III and Eu III depletion from the culture medium by the acidophilic verrucomicrobial methanotroph Methylacidiphilum fumariolicum SolV. The assay can also be modified to screen the uptake of other REE such as Pr III or to monitor the depletion of La III from growth media in neutrophilic methylotrophs such as Methylobacterium extorquens AM1...
February 16, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29453084/solid-lipid-nanoparticles-as-an-efficient-drug-delivery-system-of-olmesartan-medoxomil-for-the-treatment-of-hypertension
#14
Nilima T Pandya, Parva Jani, Jigar Vanza, Hemal Tandel
The aim of the current investigation was to develop solid lipid nanoparticles of olmesartan medoxomil using hot homogenization method to improve its oral bioavailability. Central composite design was applied to optimize the formulation variables; lipid X1 (Glyceryl monostearate) and surfactant X2 (Poloxamer: Tween 80). The particle sizes were in the nanometer range and spherical shaped for all prepared solid lipid nanoparticles formulations and the zeta potential absolute values were high, predicting good long-term stability...
February 9, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29453021/towards-sustainable-feedstocks-a-guide-to-electron-donors-for-microbial-carbon-fixation
#15
REVIEW
Nico Joannes Claassens, Irene Sánchez-Andrea, Diana Zita Sousa, Arren Bar-Even
The replacement of fossil and agricultural feedstocks with sustainable alternatives for the production of chemicals and fuels is a societal and environmental necessity. This challenge can be tackled by using inorganic or one-carbon compounds as electron donors for microbial CO 2 fixation and bioproduction. Yet, considering the wide array of microbial electron donors, which are the best suited for bioindustry? Here, we propose criteria to evaluate these compounds, considering factors such as production methods, physicochemical properties, and microbial utilization...
February 13, 2018: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/29452343/height-based-equations-can-improve-the-diagnosis-of-elevated-blood-pressure-in-children
#16
F A Mourato, S S Mattos, J L Lima Filho, M F Mourato, W Nadruz JÚnior
Background: High blood pressure (BP) is usually underdiagnosed in children and adolescents, particularly due to its complex diagnosis process. This study describes novel height-based equations for the detection of BP disorders (BP>90th percentile) and compares the accuracy of this approach with previously described screening methods to identify BP disorders. Methods: Height-based equations were built using the 90th percentile values for systolic and diastolic BP and respective height values from the current guideline of high BP management in children...
February 14, 2018: American Journal of Hypertension
https://www.readbyqxmd.com/read/29452220/methods-for-analyzing-matched-designs-with-double-controls-excess-risk-is-easily-estimated-and-misinterpreted-when-evaluating-traffic-deaths
#17
Donald A Redelmeier, Robert J Tibshirani
OBJECTIVE: To demonstrate analytic approaches for matched studies where two controls are linked to each case and events are accumulating counts rather than binary outcomes. A secondary intent is to clarify the distinction between total risk and excess risk (unmatched vs matched perspectives). STUDY DESIGN AND SETTING: We review past research testing whether elections can lead to increased traffic risks. The results are reinterpreted by analyzing both the total count of individuals in fatal crashes and the excess count of individuals in fatal crashes, each time accounting for the matched double controls...
February 13, 2018: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/29452180/the-m-maze-task-an-automated-method-for-studying-fear-memory-in-rats-exposed-to-protracted-aversive-conditioning
#18
Rimenez R Souza, Nicole M Robertson, David T Pruitt, Lindsey Noble, Eric C Meyers, Phillip A Gonzales, Nathaniel P Bleker, Holle L Carey, Seth A Hays, Michael P Kilgard, Christa K McIntyre, Robert L Rennaker
BACKGROUND: Fear conditioning (FC) in rodents is the most used animal model to investigate the neurobiology of posttraumatic stress disorder (PTSD). Although research using FC has generated a better understanding of fear memories, studies often rely on mild or moderate FC training and behavioral analysis generally focuses on measuring freezing responses within few test sessions. NEW METHOD: We introduce the M-Maze task, a system to measures extinction of conditioned fear using suppression of operant behavior...
February 13, 2018: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29452104/improved-protein-determination-assays-obtained-after-substitution-of-copper-sulfate-by-copper-oxide-nanoparticles
#19
Preety, Nidhi Chauhan, Swati Sharma, Vinita Hooda
Copper oxide nanoparticles (nano CuO) provide Cu 2+ ions which can be easily harnessed for protein determination as an alternative to the use of copper sulfate (CuSO 4 ). In the present work, nano CuO of size <25 nm were substituted for CuSO 4 in two of the well-known protein assays viz. Lowry method and bicinchoninic acid (BCA) method. Use of nano CuO in the Lowry's assay had no effect on the assay time (30 min) but significantly lowered the limit of detection (LOD) from 0.01 to 0.001 μg/ml, while the BCA method when performed using nano CuO resulted in notable reduction of not only the assay time from 30 to 20 min but also the LOD from 0...
February 13, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29452051/using-the-ecological-model-to-understand-influences-on-college-student-vaping
#20
Marshall Cheney, Mary Gowin, Ashley H Clawson
Objective The Ecological Model was used to examine the social and environmental influences of the college environment on e-cigarette use (vaping) among college students. Participants Undergraduate college student e-cigarette users (vapers) across three large college campuses in the southwest US from Jan 2015- Aug 2016. Methods Thirty-three interviews were conducted. Transcribed interviews were coded then analyzed for themes. Results College student vapers report multiple levels of influence on their vaping beyond personal beliefs and peer influences, including parents, explicit campus and community messaging, community member requests, and respect for others...
February 16, 2018: Journal of American College Health: J of ACH
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