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Xuan Zhang, Xiaohan Sun
We propose a time division multiplexing passive optical network (TDM-PON) monitoring scheme based on the optical pulse width modulation (OPWM) by using a simple asymmetric loop (AL) located near the optical network unit (ONU). Various pulse widths can be easily obtained by configuring the appropriate length of the patchcord used to generate the path difference between two branches of a 1 × 2 splitter. Different wavelengths can be assigned to the same pulse width, which can further increase the network size...
March 14, 2018: Scientific Reports
Qingxia Zhu, Xiaoyan Yu, Zebing Wu, Feng Lu, Yongfang Yuan
Antipsychotics are the drugs most often involved in drug poisoning cases, and therefore, therapeutic drug monitoring (TDM) is necessary for safe and effective medication administration of these drugs. In this study, a coffee ring effect-based surface-enhanced Raman spectroscopy (CRE-SERS) method was developed and successfully used to monitor antipsychotic poisoning by using urine samples for the first time. The established method exhibited excellent SERS performance since more hot spots were obtained in the "coffee ring"...
July 19, 2018: Analytica Chimica Acta
Natália B Andriguetti, Roberta Z Hahn, Lilian F Lizot, Suziane Raymundo, Jose L Costa, Kelly F da Cunha, Ramon M M Vilela, Helena M Kluck, Gilberto Schwartsmann, Marina V Antunes, Rafael Linden
BACKGROUND: Paclitaxel (PCT) is a chemotherapeutic drug widely used for the treatment of several types of tumors, and its use is associated with severe adverse events, mainly neurologic and hematopoietic toxicities. The relation between systemic exposure and clinical response to PCT was previously described, making paclitaxel a potential candidate for therapeutic drug monitoring (TDM). The use of dried blood spot (DBS) sampling could allow complex sampling schedules required for TDM of PCT...
March 4, 2018: Clinical Biochemistry
Muhammad Awais, Aftab Wajid, Muhammad Farrukh Saleem, Wajid Nasim, Ashfaq Ahmad, Muhammad Aown Sammar Raza, Muhammad Usman Bashir, Muhammad Mubeen, Hafiz Mohkum Hammad, Muhammad Habib Ur Rahman, Umer Saeed, Muhammad Naveed Arshad, Jamshad Hussain
Growth, development, and economic yield of agricultural crops rely on moisture, temperature, light, and carbon dioxide concentration. However, the amount of these parameters is varying with time due to climate change. Climate change is factual and ongoing so, first principle of agronomy should be to identify climate change potential impacts and adaptation measures to manage the susceptibilities of agricultural sector. Crop models have ability to predict the crop's yield under changing climatic conditions. We used OILCROP-SUN model to simulate the influence of elevated temperature and CO2 on crop growth duration, maximum leaf area index (LAI), total dry matter (TDM), and achene yield of sunflower under semi-arid conditions of Pakistan (Faisalabad, Punjab)...
March 5, 2018: Environmental Science and Pollution Research International
Dehua Liu, Ben Chung-Lap Chan, Ling Cheng, Miranda Sin-Man Tsang, Jing Zhu, Chun-Wai Wong, Delong Jiao, Helen Yau-Tsz Chan, Ping Chung Leung, Christopher Wai-Kei Lam, Chun Kwok Wong
The immune system responds to Mycobacterium tuberculosis (MTB) infection by forming granulomas to quarantine the bacteria from spreading. Granuloma-mediated inflammation is a cause of lung destruction and disease transmission. Sophora flavescens (SF) has been demonstrated to exhibit bactericidal activities against MTB. However, its immune modulatory activities on MTB-mediated granulomatous inflammation have not been reported. In the present study, we found that flavonoids from Sophora flavescens (FSF) significantly suppressed the pro-inflammatory mediators released from mouse lung alveolar macrophages (MH-S) upon stimulation by trehalose dimycolate (TDM), the most abundant lipoglycan on MTB surface...
March 2, 2018: Scientific Reports
Rosa Helena Bustos, Carlos Zapata, Efraín Esteban, Julio-César García, Edwin Jáuregui, Diego Jaimes
This study describes the development of an immunosensory label-free quantification methodology based on surface plasmon resonance (SPR) and its applicability in measuring/evaluating therapeutic drug monitoring (TDM) of anti-TNF-α monoclonal antibody (adalimumab) in rheumatoid arthritis (RA) patients. The experimental parameters evaluated in this study were immobilising ligands by pre-concentration assays, sensor surface regeneration, ascertaining the method's sensitivity and correlating the results from quantifying plasma samples by ELISA immunoassay...
February 26, 2018: Sensors
Hyojin Chae, Jeong Joong Lee, Kyoungho Cha, Su Hyun Her, Hyo-Young Kim, Eunhee Han, Myungshin Kim, Yonggoo Kim, Sung-Yeon Cho, Dong-Gun Lee
BACKGROUND: Teicoplanin is a glycopeptide antibiotic that has become increasingly popular with the spread of methicillin-resistant Staphylococcus aureus. The aim of the study was to develop and validate a UHPLC-MS/MS (ultra-high performance liquid chromatography tandem mass spectrometry) method for teicoplanin, and analyze trough teicoplanin concentrations achieved in patients with hematological diseases. METHODS: The UHPLC-MS/MS method for teicoplanin was developed, validated, and applied in a retrospective analysis of trough plasma teicoplanin concentrations from 305 patients receiving standard dose, and 17 patients receiving TDM-guided individualized dose...
February 27, 2018: Therapeutic Drug Monitoring
Georgios Schoretsanitis, Michael Paulzen, Stefan Unterecker, Markus Schwarz, Andreas Conca, Gerald Zernig, Gerhard Gründer, Ekkerhard Haen, Pierre Baumann, Niels Bergemann, Hans Willi Clement, Katharina Domschke, Gabriel Eckermann, Karin Egberts, Manfred Gerlach, Christine Greiner, Ursula Havemann-Reinecke, Gudrun Hefner, Renate Helmer, Ger Janssen, Eveline Jaquenoud-Sirot, Gerd Laux, Thomas Messer, Rainald Mössner, Matthias J Müller, Bruno Pfuhlmann, Peter Riederer, Alois Saria, Bernd Schoppek, Margarete Silva Gracia, Benedikt Stegmann, Werner Steimer, Julia C Stingl, Manfred Uhr, Sven Ulrich, Roland Waschgler, Gabriela Zurek, Christoph Hiemke
OBJECTIVES: Therapeutic drug monitoring (TDM) combines the quantification of drug concentrations in blood, pharmacological interpretation and treatment guidance. TDM introduces a precision medicine tool in times of increasing awareness of the need for personalized treatment. In neurology and psychiatry, TDM can guide pharmacotherapy for patient subgroups such as children, adolescents, pregnant women, elderly patients, patients with intellectual disabilities, patients with substance use disorders, individuals with pharmacokinetic peculiarities and forensic patients...
March 1, 2018: World Journal of Biological Psychiatry
Anouk E Muller, Benedikt Huttner, Angela Huttner
Antibiotics are among the medications most frequently administered to the critically ill, a population with high levels of intra- and inter-individual pharmacokinetic variability. Our knowledge of the relationships among antibiotic dosing, exposure and clinical effect in this population has increased in recent decades. Therapeutic drug monitoring (TDM) of serum antibiotic concentrations is the most practical means of assessing adequate antibiotic exposure, though until recently, it has been underutilised for this end...
February 23, 2018: Drugs
Can-Jun Ruan, Wei Guo, Miao Zhou, Gui-Xin Guo, Chuan-Yue Wang, Wen-Biao Li, Jose de Leon
A recent guideline recommends therapeutic drug monitoring (TDM) for risperidone, paliperidone and olanzapine, which are frequently-used second-generation antipsychotics. We developed a simple high-performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) coupled with an online solid-phase extraction (SPE) method that can be used to measure risperidone, paliperidone and olanzapine using small (40 μL) samples. The analytes were extracted from serum samples automatically pre-concentrated and purified by C8 (5 μm, 2...
February 23, 2018: Biomedical Chromatography: BMC
Paschoalina Romano, Maria da Luz Fernandes, Pérsio de Almeida Rezende Ebner, Nayara Duarte de Oliveira, Larissa Mitsue Okuda, Fabiana Agena, Maria Elizabete Mendes, Nairo Massakazu Sumita, Verônica Coelho, Elias David-Neto, Nelson Zocoler Galante
Monitoring tacrolimus (Tac) exposure in cell matrices enriched with lymphocytes can improve Tac therapeutic drug monitoring (TDM) in solid organ transplant recipients. An UPLC-MS/MS based assay for Tac quantification in peripheral blood T CD4+ and B CD19+ lymphocytes was developed. Peripheral blood mononuclear cells (PBMC) were obtained by density gradient centrifugation and highly purified (purity >90%) T CD4+ and B CD19+ cell suspensions were acquired by magnetic negative selection from whole blood of 6 healthy volunteers...
January 5, 2018: Journal of Pharmaceutical and Biomedical Analysis
V Goti, A Chaturvedula, M J Fossler, S Mok, J T Jacob
BACKGROUND: Despite being in clinical use for about six decades, vancomycin dosing remains perplexing and complex. METHODS: A population pharmacokinetic modeling and simulation approach was used to evaluate the efficiency of the current nomogram-based dosing of vancomycin. Serum vancomycin concentrations were obtained as a part of routine therapeutic drug monitoring (TDM) from two 500-bed academic medical centers. A population pharmacokinetic model was first built using these TDM data...
February 20, 2018: Therapeutic Drug Monitoring
Hannah Hoseyni, Yan Xu, Honghui Zhou
Therapeutic drug monitoring (TDM), or the measurement of drug concentrations in blood and antidrug antibodies, for biologic therapies used to treat inflammatory bowel disease (IBD) is an area of growing interest within the IBD community. When there is a definable relationship between drug concentration and clinical effect, blood concentration of biologics (and antidrug antibodies assessment) could be used to predict patient response and to titrate the biologics to maximize therapeutic benefit. This dose individualization has been proven to be more efficacious and cost-effective than empiric dose adjustment and can better guide therapeutic decisions regarding therapy withdrawal or switch...
February 20, 2018: Journal of Clinical Pharmacology
T Yu Noskova, D A Abaimov, A K Sariev, P A Fedin, A V Krasnikov, V V Shvedkov, R D Sejfulla
AIM: To estimate pharmacokinetic variability of lamotrigine (LTG) and its clinical significance. MATERIAL AND METHODS: One hundred patients, including 74 women, aged from 18 to 77 years (38.23±14.37 years), with focal epilepsy were examined. Monotherapy with LTG was administered to 54 patients, duotherapy to 46 patients (LTG and valproic acid combination to 27 patients, LTG and liver enzymes inducers to 19 patients). Patients underwent procedures of therapeutic drug monitoring (TDM)...
2018: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
Sébastien Landry, Chi-Nan Chen, Nimish Patel, Alice Tseng, Richard G Lalonde, Denis Thibeault, Steven Sanche, Nancy L Sheehan
Therapeutic drug monitoring (TDM) constitutes a compelling approach for the optimization of antiretroviral therapy in treatment-experienced HIV-1 patients. While various inhibitory indices have been proposed to predict virologic outcome, there is a lack of consensus on the clinical value of TDM. Here, we report the comparative results of TDM in 14 HIV-1-infected patients who had previously received at least two different PI-based regimens and who initiated darunavir (DRV)-based salvage therapy. Pharmacokinetic/pharmacodynamics (PK/PD) parameters were calculated for each subject...
February 16, 2018: Antiviral Research
Andrea Gruber, Martin Czejka, Philipp Buchner, Marie Kitzmueller, Nairi Kirchbaumer Baroian, Christian Dittrich, Azra Sahmanovic Hrgovcic
PURPOSE: In this study, a therapeutic drug monitoring (TDM) of erlotinib in pancreatic cancer patients was performed over 50 weeks to reveal possible alterations in erlotinib plasma concentrations. Additionally, a physiologically based pharmacokinetic (PBPK) model was created to assess such variations in silico. METHODS: Patients with advanced pancreatic cancer received a chemotherapeutic combination of 100 mg erlotinib q.d., 500-900 mg capecitabine b.d. and 5 mg/kg bevacizumab q...
February 16, 2018: Cancer Chemotherapy and Pharmacology
Cecilie Johannessen Landmark, Anette Huuse Farmen, Margrete Larsen Burns, Arton Baftiu, Morten I Lossius, Svein I Johannessen, Torbjörn Tomson
BACKGROUND AND PURPOSE: Use of valproate (VPA) in women of childbearing age is restricted due to dose-dependent risk of teratogenicity. The purpose of this study was to characterise pharmacokinetic variability of VPA in pregnancy, and discuss use of therapeutic drug monitoring (TDM) as guidance to exposure in women. METHOD: Measurements of trough total and unbound VPA concentrations before, during and after pregnancy, at assumed steady-state were collected from the TDM-database (2006-2016) at the National Center for Epilepsy in Norway...
February 11, 2018: Epilepsy Research
F Matacchiera, C Manes, R P Beaven, T C Rees-White, F Boano, J Mønster, C Scheutz
The measurement of methane emissions from landfills is important to the understanding of landfills' contribution to greenhouse gas emissions. The Tracer Dispersion Method (TDM) is becoming widely accepted as a technique, which allows landfill emissions to be quantified accurately provided that measurements are taken where the plumes of a released tracer-gas and landfill-gas are well-mixed. However, the distance at which full mixing of the gases occurs is generally unknown prior to any experimental campaign...
February 13, 2018: Waste Management
Devangsingh Sankhala, Sriram Muthukumar, Shalini Prasad
A four-channel electrochemical impedance spectroscopy (EIS) analyzer module has been demonstrated on flexible chemi-impedance sensors fabricated with gold electrodes for wearable applications. The module can perform time division multiplexed (TDM) impedance measurements on four sensors at 1 kHz. In this work, we characterize the system for the detection of cortisol in an ultralow volume (1-3 µL) of perspired human sweat, sensor performance, and effects during continuous cortisol dosing and with pH and temperature variations expected on the surface of the skin that would be representative of use conditions as seen by a wearable device...
February 1, 2018: SLAS Technology
Laura Hutchinson, Marlene Sinclair, Bernadette Reid, Kathryn Burnett, Bridgeen Callan
INTRODUCTION: Saliva, as a matrix, offers many benefits over blood in therapeutic drug monitoring (TDM), in particular for infantile TDM. However, the accuracy of salivary TDM in infants remains an area of debate. This review explored the accuracy, applicability and advantages of using saliva TDM in infants and neonates. METHODS: Databases were searched up to and including September 2016. Studies were included based on PICO as follows: P: Infants and neonates being treated with any medication, I: Salivary Therapeutic Drug Monitoring vs C: Traditional methods and O: accuracy, advantages/disadvantages and applicability to practice...
February 14, 2018: British Journal of Clinical Pharmacology
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