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https://www.readbyqxmd.com/read/28437701/a-high-performance-and-highly-controllable-core-shell-imprinted-sensor-based-on-the-surface-enhanced-raman-scattering-for-detection-of-r6g-in-water
#1
Hongji Li, Jiaqi Jiang, Zirun Wang, Xiaonan Wang, Xiqing Liu, Yongsheng Yan, Chunxiang Li
A novel, sensitive sensor material combined the technique of surface enhance Raman scattering (SERS) and molecular imprinting was prepared. It was used the amino-functionalized SiO2 nanospheres as the supporting materials and anchored Ag nanoparticles on the surface by the function of coordination between Ag(+) and NH2(-). Then, it was used that the Rhodamine 6G (R6G) as the template, acrylamide (AM) as functional monomer, ethyleneglycol dimethacrylate (EGDMA) as cross-linker, 2,2'-azobis(2-methylpropionitrile) (AIBN) as initiator to prepare the core-shell molecular imprinted polymers...
April 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28435078/preformulation-studies-of-ceftriaxone-for-pediatric-non-parenteral-administration-as-an-alternative-to-existing-injectable-formulations
#2
Tina Kauss, Mathieu Marchivie, Thida Phoeung, Alexandra Gaubert, Amélie Désiré, Giovanni Tonelli, Chantal Boyer, Marie-Hélène Langlois, Anthony Cartwright, Melba Gomes, Nicholas White, Karen Gaudin
Ceftriaxone, a third generation cephalosporin, has a wide antibacterial spectrum that has good CNS penetration, which makes it potentially suitable for initial treatment of severe neonatal pediatric infections providing suitable formulation. We evaluated its physicochemical and technical characteristics to assess its potential for development as a non-parenteral dosage form. As ceftriaxone is marked only for injectable use, these data are not available. Using HPLC and Karl Fischer titration, sensitivity of ceftriaxone to water, feasibility and impact of pharmaceutical processes and compatibility with common pharmaceutical excipients were assessed...
April 20, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28432428/tranexamic-acid-for-treatment-and-prophylaxis-of-bleeding-and-hyperfibrinolysis
#3
Ingrid Pabinger, Dietmar Fries, Herbert Schöchl, Werner Streif, Wolfgang Toller
Uncontrolled massive bleeding with subsequent derangement of the coagulation system is a major challenge in the management of both surgical and seriously injured patients. Under physiological conditions activators and inhibitors of coagulation regulate the sensitive balance between clot formation and fibrinolysis. In some cases, excessive and diffuse bleeding is caused by systemic activation of fibrinolysis, i. e. hyperfibrinolysis (HF). Uncontrolled HF is associated with a high mortality. Polytrauma patients and those undergoing surgical procedures involving organs rich in plasminogen proactivators (e...
April 21, 2017: Wiener Klinische Wochenschrift
https://www.readbyqxmd.com/read/28431478/successful-treatment-of-multidrug-resistant-acinetobacter-baumannii-meningitis-with-ampicillin-sulbactam-in-primary-hospital
#4
Leitao Sun, Xiaohong Wang, Zefu Li
INTRODUCTION: Acinetobacter baumannii nosocomial infections, especially those due to multi-drug resistant strains, are increasingly detected. We want to find the effective treatment measures about multi-resistant Acinetobacter baumannii infections through this research. METHODOLOGY: The clinical features and the outcomes of twelve cases of nosocomial Acinetobacter baumannii meningitis treated with ampicillin sulbactam and intrathecal use of amikacin are reported in primary hospital...
April 21, 2017: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/28428267/association-of-nf%C3%AE%C2%BAb-polymorphisms-with-clinical-outcome-of-non-medullary-thyroid-carcinoma
#5
Theo S Plantinga, Mirela Petrulea, Marije Oosting, Leo Joosten, Doina Piciu, Jan Wa Smit, Romana T Netea-Maier, Carmen Georgescu
The NF-κB inflammatory pathway plays a major role in cancer development and clinical progression. Activation of NF-κB signaling is promoted by NFKB1 and inhibited by NFKBIA. The present study aimed to determine the relevance of NFKB1 rs4648068 and NFKBIA rs2233406 genetic variants for non-medullary thyroid cancer (NMTC) susceptibility, progression and clinical outcome. This case-control and cohort study consists of a Romanian discovery cohort (157 patients, 258 controls) and a Dutch validation cohort (138 patients, 188 controls)...
April 20, 2017: Endocrine-related Cancer
https://www.readbyqxmd.com/read/28425079/outcome-of-patients-with-septic-shock-and-high-dose-vasopressor-therapy
#6
Thomas Auchet, Marie-Alix Regnier, Nicolas Girerd, Bruno Levy
BACKGROUND: Despite the dissemination of international guidelines, mortality from septic shock remains high. Norepinephrine is recommended as first-line vasopressor therapy with a target mean arterial pressure of 65 mmHg. High-dose vasopressor (HDV) may also be required. This study aimed to assess survival in patients with septic shock requiring HDV. We conducted a retrospective study of patients admitted between January 2008 and December 2013 to a 13-bed ICU for septic shock and receiving high-dose vasopressor therapy (defined by a dose >1 µg/kg/min)...
December 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28421792/micronutrient-supplementation-in-gastric-bypass-surgery-prospective-study-on-in%C3%AF-ammation-and-iron-metabolism-in-premenopausal-women
#7
Flávia Andréia Marin, Rozangela Verlengia, Alex Harley Crisp, Patrícia Fátima Sousa Novais, Irineu Rasera-Junior, Maria Rita Marques De Oliveira
BACKGROUND: Low-grade chronic inflammation in morbid obesity is associated with impaired iron metabolism. Bariatric surgery is effective in weight loss; however, it can induce specific nutritional deficiencies, such as iron, especially in premenopausal women. Alternatively, after surgery, there is an improvement in systemic inflammation, raising questions concerning the dosages of micronutrient supplementation. OBJECTIVES: This study aimed to assess the effect of two micronutrient supplementation schemes before and 6 months after a Roux-en-Y gastric bypass (RYGB) surgery on inflammation and iron metabolism in premenopausal women...
March 30, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/28415529/a-sensitive-voltammetric-detection-of-pramipexole-based-on-1-1-3-3-tetramethyldisilazanecarbon-nanotube-modified-electrode
#8
Saeede Amirighadi, Jahan Bakhsh Raoof, Fereshteh Chekin, Reza Ojani
A simple low-cost method is proposed to fabricate a functionalized multi-wall carbon nanotube (MWCNT) with 1,1,3,3-tetramethyldisilazane (TMDS) molecule. The techniques of scanning electron microscope (SEM) with electron diffraction and energy dispersive X-ray (EDAX) analysis were applied to characterize the functionalized TMDS-MWCNT. The results showed that a MWCNT with high functionalization of TMDS can be obtained using this simple method. A new nanostructure sensor was constructed based on a glassy carbon electrode modified with TMDS-MWCNT (TMDS-MWCNT/GCE)...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28412661/reliable-clinical-serum-analysis-with-reusable-electrochemical-sensor-toward-point-of-care-measurement-of-the-antipsychotic-medication-clozapine
#9
Mijeong Kang, Eunkyoung Kim, Thomas E Winkler, George Banis, Yi Liu, Christopher A Kitchen, Deanna L Kelly, Reza Ghodssi, Gregory F Payne
Clozapine is one of the most promising medications for managing schizophrenia but it is under-utilized because of the challenges of maintaining serum levels in a safe therapeutic range (1-3μM). Timely measurement of serum clozapine levels has been identified as a barrier to the broader use of clozapine, which is however challenging due to the complexity of serum samples. We demonstrate a robust and reusable electrochemical sensor with graphene-chitosan composite for rapidly measuring serum levels of clozapine...
April 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28411222/effect-of-antimicrobial-and-physical-treatments-on-growth-of-multispecies-staphylococcal-biofilms
#10
Elizabeth J Stewart, David E Payne, Tianhui Maria Ma, J Scott VanEpps, Blaise R Boles, John G Younger, Michael J Solomon
The prevalence and structure of Staphylococcus aureus and Staphylococcus epidermidis within multispecies biofilms was found to depend sensitively on physical environment and antibiotic dosage. Although these species commonly infect similar sites, such as orthopedic implants, little is known about their behavior in multispecies communities, particularly in response to treatment. This research establishes that S. aureus is much more prevalent than S. epidermidis when simultaneously seeded and grown in unstressed conditions (pH = 7, 37°C) in both laboratory and clinical strains...
April 14, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28408837/polymorphisms-of-vkorc1-and-cyp2c9-are-associated-with-warfarin-sensitivity-in-chinese-population
#11
LiQun Jia, Zanxin Wang, Jianlong Men, Heng Cai, Minxin Wei
OBJECTIVE: Warfarin is a commonly prescribed anticoagulant for prevention of thromboembolic events. Wide inter-individual dose variation, narrow therapeutic range and risk of serious bleeding result in difficulties in achieving the therapeutic effect. The present study was designed to clarify the real biological significance of the polymorphisms of VKORC1 and cytochrome P450 2C9 (CYP2C9) in warfarin metabolism. METHODS: A total of 214 patients with warfarin anticoagulant therapy were selected...
2017: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/28403217/embryonic-loss-of-human-females-with-partial-trisomy-19-identifies-region-critical-for-the-single-active-x
#12
Barbara R Migeon, Michael A Beer, Hans T Bjornsson
To compensate for the sex difference in the number of X chromosomes, human females, like human males have only one active X. The other X chromosomes in cells of both sexes are silenced in utero by XIST, the Inactive X Specific Transcript gene, that is present on all X chromosomes. To investigate the means by which the human active X is protected from silencing by XIST, we updated the search for a key dosage sensitive XIST repressor using new cytogenetic data with more precise resolution. Here, based on a previously unknown sex bias in copy number variations, we identify a unique region in our genome, and propose candidate genes that lie within, as they could inactivate XIST...
2017: PloS One
https://www.readbyqxmd.com/read/28400722/sex-differences-in-the-physiological-and-behavioral-effects-of-chronic-oral-methylphenidate-treatment-in-rats
#13
Lisa S Robison, Michalis Michaelos, Jason Gandhi, Dennis Fricke, Erick Miao, Chiu-Yim Lam, Anthony Mauceri, Melissa Vitale, Junho Lee, Soyeh Paeng, David E Komatsu, Michael Hadjiargyrou, Panayotis K Thanos
Methylphenidate (MP) is a psychostimulant prescribed for Attention Deficit Hyperactivity Disorder. Previously, we developed a dual bottle 8-h-limited-access-drinking-paradigm for oral MP treatment of rats that mimics the pharmacokinetic profile of treated patients. This study assessed sex differences in response to this treatment. Male and female Sprague Dawley rats were assigned to one of three treatment groups at 4 weeks of age (n = 12/group): Control (water), low dose (LD) MP, and high dose (HD) MP. Rats drank 4 mg/kg MP (LD) or 30 mg/kg MP (HD) during the first hour, and 10 mg/kg (LD) or 60 mg/kg MP (HD) for the remaining 7 h each day...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28394491/randomized-blinded-placebo-and-positive-controlled-crossover-study-to-determine-the-effect-of-deferiprone-on-the-qtc-interval-in-healthy-subjects
#14
Caroline Fradette, Anna Rozova, Anne Stilman, Yu Chung Tsang, Mark J Allison, Fernando Tricta
This study evaluated whether deferiprone, an oral iron chelator, acts to prolong the QT interval. Fifty healthy volunteers received single doses of each of the following: therapeutic dose of deferiprone (33 mg/kg), supratherapeutic dose (50 mg/kg), placebo, or moxifloxacin, a positive control known to significantly prolong QT interval. Following each dose, subjects underwent cardiac monitoring, pharmacokinetics assessments, and safety assessments. Based on the QT interval obtained using the Fridericia correction for heart rate (QTcF), the upper bound of the 1-sided 95% confidence interval of the mean difference between deferiprone and placebo was <10 milliseconds (the threshold of concern defined by authorities) at all time points for both doses: maximum difference of 3...
April 10, 2017: Clinical Pharmacology in Drug Development
https://www.readbyqxmd.com/read/28393105/patients-with-primary-sclerosing-cholangitis-require-more-sedation-during-endoscopic-retrograde-cholangiography
#15
Carsten Keil, Lukas Aguirre Dávila, Theodor Framke, Henrike Lenzen, Michael P Manns, Tim O Lankisch, Torsten Voigtländer
Background and study aims Patients with primary sclerosing cholangitis (PSC) require repeated endoscopic retrograde cholangiography (ERC). Our aim was to evaluate whether patients with PSC require higher doses of sedation during ERC. Patients and methods We retrospectively analyzed all patients undergoing ERC from 2006 to 2013 who received conscious sedation with propofol and midazolam. The duration of the intervention and a potential progression of propofol consumption or intervention time by visit number were analyzed...
April 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/28392376/endoplasmic-reticulum-targeting-photosensitizer-hypericin-confers-chemo-sensitization-towards-oxaliplatin-through-inducing-pro-death-autophagy
#16
Shengchao Lin, Liyan Yang, Haiyang Shi, Wenpei Du, Yingxue Qi, Cen Qiu, Xin Liang, Weibin Shi, Jianwen Liu
Hypericin is an endoplasmic reticulum (ER)-located photosensitizer, which causes oxidative damage to ER during photodynamic therapy (PDT). Hypericin-mediated PDT (HY-PDT) has been confirmed to enhance chemo-sensitivity of oxaliplatin (L-OHP) in colon cancer cells. The present study reveals that autophagy plays a key role in chemosensitization during HY-PDT. We proved pro-death autophagy was required for sensitization and HY-PDT/L-OHP antitumor synergism. High dosage of HY-PDT induced autophagic cell death; while low dose of HY-PDT predominantly triggered protective autophagy and promoted cell proliferation...
April 6, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28388617/fetal-de-novo-mutations-and-preterm-birth
#17
Jingjing Li, John Oehlert, Michael Snyder, David K Stevenson, Gary M Shaw
Preterm birth (PTB) affects ~12% of pregnancies in the US. Despite its high mortality and morbidity, the molecular etiology underlying PTB has been unclear. Numerous studies have been devoted to identifying genetic factors in maternal and fetal genomes, but so far few genomic loci have been associated with PTB. By analyzing whole-genome sequencing data from 816 trio families, for the first time, we observed the role of fetal de novo mutations in PTB. We observed a significant increase in de novo mutation burden in PTB fetal genomes...
April 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28381422/polo-kinase-mediates-the-phosphorylation-and-cellular-localization-of-nuf-fip3-a-rab11-effector
#18
Lotti Brose, Justin Crest, Li Tao, William Sullivan
Animal cytokinesis involves both actin-myosin based contraction and vesicle-mediated membrane addition. In many cell types, including early Drosophila embryos, Nuf/FIP3, a Rab11 effector, mediates recycling endosome (RE)-based vesicle delivery to the cytokinesis furrow. Nuf exhibits a cell cycle-regulated concentration at the centrosome that is accompanied by dramatic changes in its phosphorylation state. Here we demonstrate maximal phosphorylation of Nuf occurs at prophase, when centrosome-associated Nuf disperses throughout the cytoplasm...
April 5, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28379874/effects-of-single-nucleotide-polymorphisms-on-surgical-and-post-surgical-opioid-requirements-a-systematic-review-and-meta-analysis
#19
Siu-Wai Choi, David M H Lam, Stanley S C Wong, Haydn H C Shiu, Amy X M Wang, Chi-Wai Cheung
OBJECTIVES: There is great heterogeneity in the way individuals respond to medications. Inherited differences, such as Single Nucleotide Polymorphisms (SNP), can influence the efficacy and toxicity of drugs. This meta-analysis aims to collate data from studies investigating the effect of SNPs on post-operative and/or intra-operative opioid requirements. METHODS: This meta-analysis was conducted following PRISMA guidelines. Eligibility criteria for studies in this meta-analysis were reporting amount of post-operative and/or intra-operative opioid used as the primary outcome and genotyping patients for SNPs in one of the following genes; OPRM1, CYP2D6, CYP3A4, CYP3A5, COMT, UGT2B7 or ABCB1...
April 4, 2017: Clinical Journal of Pain
https://www.readbyqxmd.com/read/28372922/kras-allelic-imbalance-strengths-and-weaknesses-in-numbers
#20
Gary J Doherty, Emma M Kerr, Carla P Martins
The identification of therapeutic vulnerabilities in mutant KRAS tumors has proven difficult to achieve. Burgess and colleagues recently reported in Cell that mutant/wild-type Kras allelic dosage determines clonal fitness and MEK inhibitor sensitivity in a leukemia model, demonstrating that KRAS allelic imbalance is likely an important and overlooked variable.
March 31, 2017: Trends in Molecular Medicine
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