keyword
MENU ▼
Read by QxMD icon Read
search

Fixed-ratio

keyword
https://www.readbyqxmd.com/read/28534263/n-acetylaspartylglutamate-inhibits-heroin-self-administration-and-heroin-seeking-behaviors-induced-by-cue-or-priming-in-rats
#1
Huaqiang Zhu, Miaojun Lai, Weisheng Chen, Disen Mei, Fuqiang Zhang, Huifeng Liu, Wenhua Zhou
Activation of presynaptic group II metabotropic glutamate receptors (mGluR2/3) inhibits drug reward and drug-seeking behavior, but the role of N-acetylaspartylglutamate (NAAG), an agonist of endogenous mGluR2/3, in heroin reward and heroin-seeking behavior remained unclear. Here, we aimed to explore the effects of exogenous NAAG on heroin self-administration and heroin-seeking behavior. First, rats were trained to self-administer heroin under a fixed ratio 1 (FR1) schedule for 10 days, then received NAAG (50 or 100 μg/10 μL in each nostril) in the absence or presence of LY341495 (1 mg/kg, i...
May 22, 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/28516387/a-diffusion-weighted-imaging-informed-continuum-model-of-the-rabbit-triceps-surae-complex
#2
M Alipour, K Mithraratne, J Fernandez
The NZ white rabbit is the animal of choice for much experimental work due to its muscular frame and similar response to human diseases, and is one of the few mammals that have had their genome sequenced. However, continuum-level computational models of rabbit muscle detailing fibre architecture are limited in the literature, especially the triceps surae complex (gastrocnemius, plantaris and soleus), which has similar biomechanics and translatable findings to the human. This study presents a geometrical model of the rabbit triceps surae informed with diffusion-weighted imaging (DWI)-based fibres...
May 18, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28507512/changes-in-dopamine-transmission-in-the-nucleus-accumbens-shell-and-core-during-ethanol-and-sucrose-self-administration
#3
Valentina Bassareo, Flavia Cucca, Roberto Frau, Gaetano Di Chiara
Ethanol, like other substances of abuse, preferentially increases dopamine (DA) transmission in the rat nucleus accumbens (NAc) following passive administration. It remains unclear, however, whether ethanol also increases NAc DA transmission following operant oral self-administration (SA). The NAc is made-up of a ventro-medial compartment, the shell and a dorso-lateral one, the core, where DA transmission responds differentially following exposure to drugs of abuse. Previous studies from our laboratory investigated changes in dialysate DA in the NAc shell and core of rats responding for sucrose pellets and for drugs of abuse...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28505185/combined-treatment-of-miltefosine-and-paromomycin-delays-the-onset-of-experimental-drug-resistance-in-leishmania-infantum
#4
Sarah Hendrickx, Magali Van den Kerkhof, Dorien Mabille, Paul Cos, Peter Delputte, Louis Maes, Guy Caljon
BACKGROUND: Since miltefosine monotherapy against visceral leishmaniasis (VL) caused by Leishmania donovani has been discontinued in the Indian subcontinent due to an increase in the number of treatment failures, single dose liposomal amphotericin B is now advocated as a treatment option of choice. Paromomycin-miltefosine combination therapy can be used as substitute first-line treatment in regions without cold-chain potential. Previous laboratory studies in the closely related species Leishmania infantum have demonstrated that paromomycin monotherapy fairly rapidly selects for resistance producing a phenotype with increased fitness...
May 15, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28451857/assessing-the-environmental-hazard-of-individual-and-combined-pharmaceuticals-acute-and-chronic-toxicity-of-fluoxetine-and-propranolol-in-the-crustacean-daphnia-magna
#5
Valentina Varano, Elena Fabbri, Andrea Pasteris
Pharmaceuticals are widespread emerging contaminants and, like all pollutants, are present in combination with others in the ecosystems. The aim of the present work was to evaluate the toxic response of the crustacean Daphnia magna exposed to individual and combined pharmaceuticals. Fluoxetine, a selective serotonin re-uptake inhibitor widely prescribed as antidepressant, and propranolol, a non-selective β-adrenergic receptor-blocking agent used to treat hypertension, were tested. Several experimental trials of an acute immobilization test and a chronic reproduction test were performed...
April 27, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28433597/prediction-of-toxicity-of-zinc-and-nickel-mixtures-to-artemia-sp-at-various-salinities-from-additivity-to-antagonism
#6
Évila Pinheiro Damasceno, Lívia Pitombeira de Figuerêdo, Marcionília Fernandes Pimentel, Susana Loureiro, Letícia Veras Costa-Lotufo
Few studies have examined the toxicity of metal mixtures to marine organisms exposed to different salinities. The aim of the present study was to investigate the acute toxicity of zinc and nickel exposures singly and in combination to Artemia sp. under salinities of 10, 17, and 35 psu. The mixture concentrations were determined according to individual toxic units (TUs) to follow a fixed ratio design. Zinc was more toxic than nickel, and both their individual toxicities were higher at lower salinities. These changes in toxicity can be attributed to the Biotic Ligand Model (BLM) rather than to metal speciation...
August 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28432746/impact-of-baseline-hba1c-diabetes-duration-and-bmi-on-clinical-outcomes-in-the-lixilan-o-trial-testing-iglarlixi-insulin-glargine-lixisenatide-titratable-fixed-ratio-combination-versus-insulin-glargine-and-lixisenatide-monocomponents
#7
M J Davies, L A Leiter, B Guerci, G Grunberger, F J Ampudia-Blasco, C Yu, W Stager, E Niemoeller, E Souhami, J Rosenstock
To determine whether baseline characteristics impact clinical outcomes in the LixiLan-O trial (N = 1170), the efficacy and safety of iGlarLixi, a titratable fixed-ratio combination of insulin glargine 100 U (iGlar) and lixisenatide (Lixi) was compared with iGlar or Lixi alone in patients with uncontrolled type 2 diabetes mellitus (T2DM) on oral therapy. Subgroups according to baseline glycated haemoglobin (HbA1c; <8%, ≥8% [<64, ≥64 mmol/mol]); T2DM disease duration (<7, ≥7 years) and body mass index (BMI; <30, ≥30 kg/m(2) ) were investigated...
April 22, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28431947/a-bout-analysis-of-operant-response-disruption
#8
Ryan J Brackney, Timothy H C Cheung, Federico Sanabria
Operant behavior appears to be organized in bouts of responses, whose parameters are differentially sensitive to various manipulations. This study investigated potential differential effects of three forms of operant response disruption-extinction (EXT), non-contingent reinforcement (NCR), and prefeeding (PRE)-on response bouts. In Experiment 1, Wistar Kyoto rats (WKY) were trained on a tandem variable-time (VT) 120s fixed-ratio (FR) 5 schedule of reinforcement; after stability was established, their responding was disrupted for three sessions with one of the three disrupters (EXT, NCR, or PRE)...
April 19, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28429835/levodopa-prevents-the-reinstatement-of-cocaine-self-administration-in-rats-via-potentiation-of-dopamine-release-in-the-medial-prefrontal-cortex
#9
Silvia Antinori, Liana Fattore, Pierluigi Saba, Walter Fratta, Gian Luigi Gessa, Paola Devoto
Dopamine agonists have been proposed as therapeutic tools for cocaine addiction. We have recently demonstrated that indirect dopamine agonists, including levodopa (L-DOPA), markedly increase cocaine-induced dopamine release in the medial prefrontal cortex (mPFC) of rats leading to the suppression of cocaine-seeking behavior. This study was aimed to understand the behavioral and neurochemical effects of L-DOPA on cocaine-taking and cocaine-seeking in rats. After reaching a stable pattern of intravenous cocaine self-administration under a continuous fixed ratio (FR-1) schedule of reinforcement, male rats were treated with L-DOPA at different steps of the self-administration protocol...
April 21, 2017: Addiction Biology
https://www.readbyqxmd.com/read/28428368/erratum-efficacy-and-safety-of-lixilan-a-titratable-fixed-ratio-combination-of-insulin-glargine-plus-lixisenatide-in-type-2-diabetes-inadequately-controlled-on-basal-insulin-and-metformin-the-lixilan-l-randomized-trial-diabetes-care-2016-39-1972-1980
#10
Vanita R Aroda, Julio Rosenstock, Carol Wysham, Jeffrey Unger, Diego Bellido, Guillermo González-Gálvez, Akane Takami, Hailing Guo, Elisabeth Niemoeller, Elisabeth Souhami, Richard M Bergenstal
No abstract text is available yet for this article.
April 20, 2017: Diabetes Care
https://www.readbyqxmd.com/read/28420696/erratum-benefits-of-lixilan-a-titratable-fixed-ratio-combination-of-insulin-glargine-plus-lixisenatide-versus-insulin-glargine-and-lixisenatide-monocomponents-in-type-2-diabetes-inadequately-controlled-on-oral-agents-the-lixilan-o-randomized-trial-diabetes
#11
Julio Rosenstock, Ronnie Aronson, George Grunberger, Markolf Hanefeld, PierMarco Piatti, Pierre Serusclat, Xi Cheng, Tianyue Zhou, Elisabeth Niemoeller, Elisabeth Souhami, Melanie Davies
No abstract text is available yet for this article.
April 18, 2017: Diabetes Care
https://www.readbyqxmd.com/read/28417535/rates-of-hypoglycaemia-are-lower-in-patients-treated-with-insulin-degludec-liraglutide-ideglira-than-with-ideg-or-insulin-glargine-regardless-of-the-hypoglycaemia-definition-used
#12
P Norwood, R Chen, E Jaeckel, I Lingvay, H Jarlov, L Lehmann, S Heller
AIMS: The rates of hypoglycaemia reported in clinical trials are affected by the definitions of hypoglycaemia used. This post-hoc analysis took data from two trials comparing the once-daily, fixed ratio combination of insulin degludec/liraglutide (IDegLira) with basal insulin regimens, and re-analysed these data using alternative hypoglycaemia definitions and stratified outcomes by dosing time and baseline characteristics. MATERIALS AND METHODS: Post hoc analyses of the DUAL I (patients uncontrolled on oral antidiabetic drugs) and DUAL V (patients uncontrolled on insulin glargine (IGlar) U100) trials were carried out using different definitions of hypoglycaemia and by whether treatments were administered in the AM or PM...
April 17, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28412411/mirtazapine-and-ketanserin-alter-preference-for-gambling-like-schedules-of-reinforcement-in-rats
#13
Amanda L Persons, Stephanie E Tedford, T Celeste Napier
Drug and behavioral addictions have overlapping features, e.g., both manifest preference for larger, albeit costlier, reinforcement options in cost/benefit decision-making tasks. Our prior work revealed that the mixed-function serotonergic compound, mirtazapine, attenuates behaviors by rats motivated by abused drugs. To extend this work to behavioral addictions, here we determined if mirtazapine and/or ketanserin, another mixed-function serotonin-acting compound, can alter decision-making in rats that is independent of drug (or food)-motivated reward...
April 12, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28401444/fixed-ratio-combinations-of-glucagon-like-peptide-1-receptor-agonists-with-basal-insulin-a-systematic-review-and-meta-analysis
#14
Paraskevi Liakopoulou, Aris Liakos, Despoina Vasilakou, Eleni Athanasiadou, Eleni Bekiari, Kyriakos Kazakos, Apostolos Tsapas
PURPOSE: Basal insulin controls primarily fasting plasma glucose but causes hypoglycaemia and weight gain, whilst glucagon like peptide 1 receptor agonists induce weight loss without increasing risk for hypoglycaemia. We conducted a systematic review and meta-analysis of randomised controlled trials to investigate the efficacy and safety of fixed ratio combinations of basal insulin with glucagon like peptide 1 receptor agonists. METHODS: We searched Medline, Embase, and the Cochrane Library as well as conference abstracts up to December 2016...
April 12, 2017: Endocrine
https://www.readbyqxmd.com/read/28396146/rats-behave-optimally-in-a-sunk-cost-task
#15
Nataly Yáñez, Arturo Bouzas, Vladimir Orduña
The sunk cost effect has been defined as the tendency to persist in an alternative once an investment of effort, time or money has been made, even if better options are available. The goal of this study was to investigate in rats the relationship between sunk cost and the information about when it is optimal to leave the situation, which was studied by Navarro and Fantino (2005) with pigeons. They developed a procedure in which different fixed-ratio schedules were randomly presented, with the richest one being more likely; subjects could persist in the trial until they obtained the reinforcer, or start a new trial in which the most favorable option would be available with a high probability...
April 8, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28396142/atypical-binding-at-dopamine-and-serotonin-transporters-contribute-to-the-discriminative-stimulus-effects-of-mephedrone
#16
Alyssa F DeLarge, Laura L Erwin, Peter J Winsauer
Mephedrone (4-methylmethcathinone), a constituent of the recreational substances known as "bath salts", is a synthetic cathinone that can produce auditory and visual hallucinations, as well as problematic cardiovascular effects. This study compared the discriminative stimulus effects of mephedrone (0.32-10 mg/kg) with other prototypical drugs of abuse: cocaine (0.56-32 mg/kg), d-amphetamine (0.18-3.2 mg/kg), ketamine (1.8-18 mg/kg), phencyclidine (PCP, 1-5.6 mg/kg), heroin (1-10 mg/kg), 2,5-dimethoxy-4-iodoamphetamine (R-DOI, 0...
April 7, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28391178/mirtazapine-attenuates-cocaine-seeking-in-rats
#17
Susana Barbosa-Méndez, Phillipe Leff, Adriana Arías-Caballero, Ricardo Hernández-Miramontes, Gerardo Heinze, Alberto Salazar-Juárez
BACKGROUND: Relapse to cocaine use is a major problem in the clinical treatment of cocaine addiction. Antidepressants have been studied for their therapeutic potential to treat cocaine use disorder. Research has suggested that antidepressants attenuate both drug craving and the re-acquisition of drug-seeking and drug-taking behaviors. This study examined the efficacy of mirtazapine, an antidepressant/anxiolytic, in decreasing cocaine seeking in rats. METHODS: We used the cocaine self-administration paradigm to assess the effects of mirtazapine on rats trained to self-administer cocaine or food under a fixed-ratio schedule...
April 4, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/28386990/consistent-findings-in-glycaemic-control-body-weight-and-hypoglycaemia-with-iglarlixi-insulin-glargine-lixisenatide-titratable-fixed-ratio-combination-versus-insulin-glargine-across-baseline-hba1c-bmi-and-diabetes-duration-categories-in-the-lixilan-l-trial
#18
C Wysham, R C Bonadonna, V R Aroda, M Puig-Domingo, C Kapitza, W Stager, C Yu, E Niemoeller, E Souhami, R M Bergenstal
AIM: To assess the impact of baseline characteristics on clinical outcomes in the LixiLan-L trial, a randomized open-label trial designed to evaluate the efficacy and safety of iGlarLixi, a novel fixed-ratio combination of insulin glargine 100 U (iGlar) plus lixisenatide, in comparison with iGlar over 30 weeks in a population of patients with type 2 diabetes mellitus (T2DM) inadequately controlled on a previous regimen of basal insulin alone or in combination with one or two oral glucose-lowering drugs...
April 6, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28382821/biocompatible-shape-memory-blend-for-self-expandable-stents-with-potential-biomedical-applications
#19
Yu Zheng, Ying Li, Xue Hu, Jiabin Shen, Shaoyun Guo
Biocompatible poly(propylene carbonate) (PPC)/polycaprolactone (PCL) shape memory blends were fabricated using melt blending. The shape memory performance of these blends was found to depend remarkably on their components. On addition of 25 vol % PCL, one blend (PL-25) achieved an optimal shape-fixing ratio (Rf) and -recovery ratio (Rr). Specifically, its Rr considerably increased by 24.1 and 50.0% compared with those of pure PPC and PCL, respectively, because of the restricted irreversible deformation of the amorphous chains cross-linked by tiny crystals...
April 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28375405/hot-topics-in-primary-care-titratable-fixed-ratio-combinations-in-type-2-diabetes-mellitus-focus-on-glp-1r-agonists-combined-with-basal-insulin
#20
REVIEW
James LaSalle, John R White
The treatment of hyperglycemia in patients without glycemic control despite metformin monotherapy is the focus of this article, with particular focus on the use of fixed-dose (FDC) and fixed-ratio combination products.
April 2017: Journal of Family Practice
keyword
keyword
112590
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"