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https://www.readbyqxmd.com/read/28344172/physicochemical-attributes-and-dissolution-testing-of-ophthalmic-ointments
#1
Quanying Bao, Rajan Jog, Jie Shen, Bryan Newman, Yan Wang, Stephanie Choi, Diane J Burgess
The investigation of semisolid ophthalmic ointments is challenging due to their complex physicochemical properties and the unique anatomy of the human eye. Using Lotemax(®) as a model ophthalmic ointment, three different manufacturing processes and two excipient sources (Fisher(®) (OWP) and Fougera(®) (NWP)) were used to prepare loteprednol etabonate ointments that were qualitatively and quantitatively the same across the manufactured formulations. Physicochemical properties including drug content and uniformity, particle size and distribution, as well as rheological parameters (onset point, crossover modulus, storage modulus and Power law consistency index) were investigated...
March 23, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28344105/a-new-reconstructed-human-epidermis-rhe-for-in-vitro-skin-irritation-testing
#2
Tatiana do Nascimento Pedrosa, Carolina Motter Catarino, Paula Comune Pennacchi, Sílvia Romano de Assis, Fabrícia Gimenes, Márcia Edilaine Lopes Consolaro, Silvia Berlanga de Moraes Barros, Silvya Stuchi Maria-Engler
Different models of reconstructed human epidermis (RHE) are currently validated to assess skin irritation in vitro and ultimately to the animal replacement of the Draize test. The development of a new RHE model is a challenge for many laboratories, representing a potential gain of autonomy and improvement of technological knowledge. The Organization for Economic Co-operation and Development (OECD) encourages the development of new models and, for this purpose, offers a thorough guideline on quality control parameters (OECD TG 439)...
March 23, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28343940/lithocholic-acid-hydroxyamide-destabilizes-cyclin-d1-and-induces-g0-g1-arrest-by-inhibiting-deubiquitinase-usp2a
#3
Katarzyna Magiera, Marcin Tomala, Katarzyna Kubica, Virginia De Cesare, Matthias Trost, Bartosz J Zieba, Neli Kachamakova-Trojanowska, Marcin Les, Grzegorz Dubin, Tad A Holak, Lukasz Skalniak
USP2a is a deubiquitinase responsible for stabilization of cyclin D1, a crucial regulator of cell-cycle progression and a proto-oncoprotein overexpressed in numerous cancer types. Here we report that lithocholic acid (LCA) derivatives are inhibitors of USP proteins, including USP2a. The most potent LCA derivative, LCA hydroxyamide (LCAHA), inhibits USP2a, leading to a significant Akt/GSK3β-independent destabilization of cyclin D1, but does not change the expression of p27. This leads to the defects in cell-cycle progression...
March 22, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28339392/stability-of-ribavirin-for-inhalation-packaged-in-syringes-or-glass-vials-when-stored-frozen-refrigerated-and-at-room-temperature
#4
Bayli Larson, Lane R Bushman, Matthew L Casciano, Alan R Oldland, Jennifer J Kiser, Tyree H Kiser
The primary aim of this study was to investigate ribavirin solution for inhalation stability under three different conditions (frozen, refrigerated, room temperature) over a 45-day period. A ribavirin 6000-mg vial was reconstituted with 90 mL of Sterile Water for Injection per the package insert to yield a concentration of approximately 67 mg/mL. The solution was then placed in either syringes or empty glass vials and stored in the freezer (-20°C), in the refrigerator (~0°C to 4°C), or at room temperature (~20°C to 25°C)...
November 2016: International Journal of Pharmaceutical Compounding
https://www.readbyqxmd.com/read/28335331/the-use-of-spray-dried-mn%C3%A2-o%C3%A2-c-composites-as-electrocatalysts-for-li-o%C3%A2-batteries
#5
Hong-Kai Yang, Chih-Chun Chin, Jenn-Shing Chen
The electrocatalytic activities of Mn₃O₄/C composites are studied in lithium-oxygen (Li-O₂) batteries as cathode catalysts. The Mn₃O₄/C composites are fabricated using ultrasonic spray pyrolysis (USP) with organic surfactants as the carbon sources. The physical and electrochemical performance of the composites is characterized by X-ray diffraction, scanning electron microscopy, particle size analysis, Brunauer-Emmett-Teller (BET) measurements, elemental analysis, galvanostatic charge-discharge methods and rotating ring-disk electrode (RRDE) measurements...
November 7, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28333584/unsupervised-2d-dimensionality-reduction-with-adaptive-structure-learning
#6
Xiaowei Zhao, Feiping Nie, Sen Wang, Jun Guo, Pengfei Xu, Xiaojiang Chen
In recent years, unsupervised two-dimensional (2D) dimensionality reduction methods for unlabeled large-scale data have made progress. However, performance of these degrades when the learning of similarity matrix is at the beginning of the dimensionality reduction process. A similarity matrix is used to reveal the underlying geometry structure of data in unsupervised dimensionality reduction methods. Because of noise data, it is difficult to learn the optimal similarity matrix. In this letter, we propose a new dimensionality reduction model for 2D image matrices: unsupervised 2D dimensionality reduction with adaptive structure learning (DRASL)...
March 23, 2017: Neural Computation
https://www.readbyqxmd.com/read/28327663/tandem-uims-confer-lys48-ubiquitin-chain-substrate-preference-to-deubiquitinase-usp25
#7
Kohei Kawaguchi, Kazune Uo, Toshiaki Tanaka, Masayuki Komada
Ubiquitin-specific protease (USP) 25, belonging to the USP family of deubiquitinases, harbors two tandem ubiquitin-interacting motifs (UIMs), a ~20-amino-acid α-helical stretch that binds to ubiquitin. However, the role of the UIMs in USP25 remains unclear. Here we show that the tandem UIM region binds to Lys48-, but not Lys63-, linked ubiquitin chains, where the two UIMs played a critical and cooperative role. Purified USP25 exhibited higher ubiquitin isopeptidase activity to Lys48-, than to Lys63-, linked ubiquitin chains...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28324282/recurrent-bowel-blood-translocations-of-escherichia-coli-with-the-unique-virulence-characteristics-over-three-year-period-in-the-patient-with-acute-myeloid-leukaemia-case-report
#8
Beata Krawczyk, Anna Śledzińska, Agnieszka Piekarska, Andrzej Hellmann, Józef Kur
In patients with haematological malignancies, the bowel remains the main source of Escherichia coli bloodstream infections. We present the clinical example of recurrent bowel-blood translocations of E. coli with the unique virulence characteristics in a 55-year-old male with the diagnosis of acute myeloid leukaemia. The virulent factors profile of examined strains confirmed that the co-existence of genes papC, sfa, usp and cnf1, encoding virulence factors, predisposes E. coli to translocation from the gastrointestinal tract to the vascular bed...
March 21, 2017: Journal of Applied Genetics
https://www.readbyqxmd.com/read/28322799/novel-method-for-measurement-of-heparin-anticoagulant-activity-using-spr
#9
Jing Zhao, Xinyue Liu, Anju Malhotra, Quanhong Li, Fuming Zhang, Robert J Linhardt
A novel method has been developed for the easy measurement of heparin's anticoagulant activity using surface plasmon resonance. The anticoagulant activity of target heparin was evaluated by measuring the competitive antithrombin III binding of analyte heparin in the solution phase and USP heparin immobilized on chip surface. Heparins, obtained from different animal sources, and low molecular weight heparins were analyzed. The results were reproducible and correlated well with the results of chromogenic assays (correlation coefficient r = 0...
March 18, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28315550/hazardous-drugs-and-usp-800-implications-for-nurses
#10
Seth Eisenberg
BACKGROUND: Although guidelines for the safe handling of hazardous drugs (HDs) have existed for several decades, they have not been enforceable by state or federal agencies. USP <800>, the latest chapter issued by the U.S. Pharmacopeial Convention, expands on existing guidelines and provides detailed information on compounding and administration. Unlike current guidelines, USP <800> will be enforced by each state's board of pharmacy or their delegated agency.
. OBJECTIVES: This article provides a brief overview of the dangers associated with HDs and the implications of USP <800> for nurses...
April 1, 2017: Clinical Journal of Oncology Nursing
https://www.readbyqxmd.com/read/28302046/the-role-of-the-complex-usp1-wdr48-in-differentiation-and-proliferation-processes-in-cancer-stem-cells
#11
Jussara Maria Gonçalves, Mabel Mariela Rodriguez Cordeiro, Elena Riet Correa Rivero
Recently some studies identified the Basic-Helix-Loop-Helix (bHLH) transcription factor as a significant regulator for the evolution of neoplasms. The binding between bHLH proteins and DNA is restricted by heterodimerization with Inhibitors of DNA binding (ID). IDs prevent cellular differentiation, promote growth and sustain tumor development. The wide presence of stem cells in cancers suggests that genes ID are essential to cancer stem cells (CSC) progress. The enzyme Ubiquitin-specific protease 1 (USP1) is reported by deubiquitination and stabilization of IDs...
March 15, 2017: Current Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28301630/translation-and-validation-of-the-uterine-fibroid-symptom-and-quality-of-life-ufs-qol-questionnaire-for-the-brazilian-portuguese-language
#12
Luiz Gustavo Oliveira Brito, Daniela Alves Malzone-Lott, Mayra Fernanda Sandoval Fagundes, Pedro Sérgio Magnani, Mariana Alves Fernandes Arouca, Omero Benedicto Poli-Neto, Antônio Alberto Nogueira
CONTEXT AND OBJECTIVE: Uterine fibroids (UF), also known as leiomyomas, are the most prevalent gynecological tumors. The Uterine Fibroid Symptoms and Quality of Life (UFS-QOL) is the only specific questionnaire that assesses symptom intensity and quality-of-life issues for women with symptomatic UF; however, it only exists in the English language. Thus, we aimed to translate and culturally validate the UFS-QOL questionnaire for the Brazilian Portuguese language. DESIGN AND SETTING: Cross-sectional study, Department of Gynecology and Obstetrics, FMRP-USP...
March 13, 2017: São Paulo Medical Journal, Revista Paulista de Medicina
https://www.readbyqxmd.com/read/28286289/mechanistic-investigation-of-the-negative-food-effect-of-modified-release-zolpidem
#13
Cord J Andreas, Xavier Pepin, Constantinos Markopoulos, Maria Vertzoni, Christos Reppas, Jennifer Dressman
AIMS: When administered orally as either an immediate or modified release dosage form, zolpidem demonstrates a negative food effect, i.e. decrease in Cmax and AUC. The aim of the study was to arrive at a better understanding of the absorption of this BCS class I compound, in vivo and to simulate the observed plasma profiles using in vitro and in silico methods. METHODS: Pharmacokinetic profiles of zolpidem are presented from a bioavailability (8mg intravenous; 10mg immediate release Stilnox®; 10mg and 12...
March 9, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28284728/activated-carbon-as-a-carrier-for-amorphous-drug-delivery-effect-of-drug-characteristics-and-carrier-wettability
#14
Nikhila Miriyala, Defang Ouyang, Yvonne Perrie, Deborah Lowry, Daniel J Kirby
Recent research on porous silica materials as drug carriers for amorphous and controlled drug delivery has shown promising results. However, due to contradictory literature reports on toxicity and high costs of production, it is important to explore alternative safe and inexpensive porous carriers. In this study, the potential of activated carbon (AC) as an amorphous drug carrier was investigated using paracetamol (PA) and ibuprofen (IBU) as model drugs. The solution impregnation method was used for drug loading, with loading efficiency determined by UV spectroscopy and drug release kinetics studied using USP II dissolution apparatus...
March 8, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28280965/radiosynthesis-and-first-in-human-pet-mri-evaluation-with-clinical-grade-18-f-ftc-146
#15
Bin Shen, Jun Hyung Park, Trine Hjørnevik, Peter W Cipriano, Daehyun Yoon, Praveen K Gulaka, Dawn Holly, Deepak Behera, Bonnie A Avery, Sanjiv S Gambhir, Christopher R McCurdy, Sandip Biswal, Frederick T Chin
PURPOSE: Sigma-1 receptors (S1Rs) play an important role in many neurological disorders. Simultaneous positron emission tomography (PET)/magnetic resonance imaging (MRI) with S1R radioligands may provide valuable information for diagnosing and guiding treatment for these diseases. Our previously reported S1R radioligand, [(18)F]FTC-146, demonstrated high affinity for the S1R (K i = 0.0025 nM) and excellent selectivity for the S1R over the sigma-2 receptor (S2Rs; K i = 364 nM) across several species (from mouse to non-human primate)...
March 9, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28268906/a-comparison-of-the-cluster-span-threshold-and-the-union-of-shortest-paths-as-objective-thresholds-of-eeg-functional-connectivity-networks-from-beta-activity-in-alzheimer-s-disease
#16
Keith Smith, Daniel Abasolo, Javier Escudero
The Cluster-Span Threshold (CST) is a recently introduced unbiased threshold for functional connectivity networks. This binarisation technique offers a natural trade-off of sparsity and density of information by balancing the ratio of closed to open triples in the network topology. Here we present findings comparing it with the Union of Shortest Paths (USP), another recently proposed objective method. We analyse standard network metrics of binarised networks for sensitivity to clinical Alzheimer's disease in the Beta band of Electroencephalogram activity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267443/balloon-removal-after-fetoscopic-endoluminal-tracheal-occlusion-for-congenital-diaphragmatic-hernia
#17
Julio A Jiménez, Elisenda Eixarch, Philip Dekoninck, João R Bennini, Roland Devlieger, Cleisson F Peralta, Eduard Gratacos, Jan Deprest
BACKGROUND: Isolated congenital diaphragmatic hernia (CDH) defect allows viscera to herniate into the chest, competing for space with the developing lungs. At birth, pulmonary hypoplasia leads to respiratory insufficiency and persistent pulmonary hypertension that is lethal in up to 30% of patients. Antenatal measurement of lung size and liver herniation can predict survival after birth. Prenatal intervention aims at stimulating lung development, clinically achieved by percutaneous fetal endoscopic tracheal occlusion (FETO) under local anesthesia...
March 3, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28263914/the-impact-of-supersaturation-level-for-oral-absorption-of-bcs-class-iib-drugs-dipyridamole-and-ketoconazole-using-in-vivo-predictive-dissolution-system-gastrointestinal-simulator-gis
#18
Yasuhiro Tsume, Kazuki Matsui, Amanda L Searls, Susumu Takeuchi, Gregory E Amidon, Duxin Sun, Gordon L Amidon
The development of formulations and the assessment of oral drug absorption for Biopharmaceutical Classification System (BCS) class IIb drugs is often a difficult issue due to the potential for supersaturation and precipitation in the gastrointestinal (GI) tract. The physiological environment in the GI tract largely influences in vivo drug dissolution rates of those drugs. Thus, those physiological factors should be incorporated into the in vitro system to better assess in vivo performance of BCS class IIb drugs...
March 3, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28260683/endocrine-related-genes-are-altered-by-antibacterial-agent-triclosan-in-chironomus-riparius-aquatic-larvae
#19
Pedro Martínez-Paz, Mónica Morales, Josune Urien, Gloria Morcillo, José Luis Martínez-Guitarte
Triclosan (TCS) is an antibacterial agent widely used in personal care and consumer products and commonly detected in aquatic ecosystems. In the present study, the effects of TCS on endocrine-related genes of Chironomus riparius aquatic larvae, a reference organism in aquatic toxicology, were evaluated. Twenty-four-hour in vivo exposures at 10µg/L, 100µg/L, and 1000µg/L TCS revealed that this xenobiotic was able to alter the transcriptional activity of ecdysone receptor gene (EcR), the ultraspiracle gene (usp), the estrogen-related receptor gene (ERR), and the E74 early ecdysone-inducible gene, as measured by real-time RT-PCR...
March 2, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28260506/ph-dependent-behavior-of-novel-gellan-beads-loaded-with-naproxen
#20
Tomasz Osmałek, Anna Froelich, Bartłomiej Milanowski, Magdalena Białas, Kinga Hyla, Mirosław Szybowicz
We have designed, formulated and characterized low-acyl gellan gum (GG) macrobeads to be applied as potential carriers for the delivery of naproxen (NPX) to the distal parts of the gastrointestinal tract. The beads were obtained by ionotropic gelation technique. CaCl2 solution (1%, 9.0×10-2 M) was used as a cross-linking medium. Nine different polymer, drug and surfactant (Tween®80) mixtures were used for beads production. The surface and morphology of the dried beads were analyzed by SEM. Raman spectra of NPX powder and the beads confirmed that NPX did not undergo structural changes during production process...
March 3, 2017: Current Drug Delivery
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