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https://www.readbyqxmd.com/read/28345449/fabrication-of-pcl-plga-bcp-porous-scaffold-for-bone-tissue-engineering-applications
#1
Nguyen Thi Hiep, Huynh Chan Khon, Nguyen Dai Hai, Lee-Byong Taek, Vo Van Toi, Le Thanh Hung
In this study, biomimic porous polycaprolactone/poly (lactide-co-glycolide) loading biphasic tricalcium phosphate (PCL/PLGA-BCP) scaffolds were fabricated successfully by solvent evaporation method. The distribution of biphasic tricalcium phosphate (BCP) in polycaprolactone/poly (lactide-co-glycolide) (PCL/PLGA) scaffold was confirmed by micro-computed tomography (micro-CT) scanning, scanning electron microscope (SEM) observation and Energy-dispersive X-ray Spectroscopy (EDS) analysis. The hydrophilicity of the scaffolds was confirmed by contact angle measurement...
March 26, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28344089/effects-of-macromolecular-crowding-on-alkaline-phosphatase-unfolding-conformation-and-stability
#2
Jiajia Jia, Xin Peng, Wei Qi, Rongxin Su, Zhimin He
The interior of the cell is tightly packed with various biological macromolecules, which affects physiological processes, especially protein folding process. To explore how macromolecular crowding may influence protein folding process, alkaline phosphatase (ALP) was chosen as a model protein, and the unfolding process of ALP induced by GdnHCl was studied in the presence of crowding agents such as PEG 4000, Dextran 70 and Ficoll 70. The effect of macromolecular crowding on the denatured state of ALP was directly probed by measuring enzyme activities, fluorescence spectroscopy and circular dichroism...
March 23, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28343339/bound-pahs-in-sediment-and-related-environmental-significance
#3
Jian-Yang Guo, Jing-An Chen, Jing-Fu Wang, Feng-Chang Wu
Extractable polycyclic aromatic hydrocarbons (EPAHs) and bound PAHs (BPAHs) were measured in a sediment core using conventional Soxhlet extraction and a more astringent extraction method, with the objectives of determining the influence of BPAHs on the historical reconstruction of PAHs and exploring the formation of BPAHs and long-term behaviors of PAHs in sediment. The results indicated that the formation of BPAHs was clearly sediment-depth and molecular-size dependent. BPAHs represents an important portion of PAHs in sediment and cannot be extracted by conventional Soxhlet extraction...
March 25, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28343118/real-time-formation-of-salivary-films-onto-polymeric-materials-for-dental-applications-differences-between-unstimulated-and-stimulated-saliva
#4
Florian Weber, Alejandro Barrantes
The formation of salivary films onto oral prostheses materials is of central importance for understanding their performance and interaction with oral tissue and flora. The aim of this work was to study and compare the salivary films formed from unstimulated and stimulated whole saliva on two common polymeric materials, polycarbonate and poly(methyl methacrylate). Irradiating these materials with UV light is a simple way to modify their wettability, roughness and ζ-potential. Therefore, the effect of UV exposure of polycarbonate and poly(methyl methacrylate) on saliva adsorption was also investigated...
March 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28341793/bet-1-in-patients-with-suspected-acute-coronary-syndrome-does-wellens-sign-on-the-electrocardiograph-identify-critical-left-anterior-descending-artery-stenosis
#5
Niall Morris, Laura Howard
Wellens' syndrome consists of a history suggestive of an acute coronary syndrome and biphasic or deeply inverted T waves in ECG leads V2-V3. A shortcut review was carried out to establish whether this ECG pattern identifies patients with a critical left anterior descending artery stenosis. Six relevant papers were found. The clinical bottom line is that biphasic T-wave inversion in lead V2-V3 should alert the clinician to a probable critical stenosis of the left anterior descending artery.
April 2017: Emergency Medicine Journal: EMJ
https://www.readbyqxmd.com/read/28341149/docetaxel-loaded-ripl-peptide-iplvvplrrrrrrrrc-conjugated-liposomes-drug-release-cytotoxicity-and-antitumor-efficacy
#6
Ho Yub Yoon, Seong Shin Kwak, Moon Ho Jang, Min Hyung Kang, Si Woo Sung, Chang Hyun Kim, Sung Rae Kim, Dong Woo Yeom, Myung Joo Kang, Young Wook Choi
We previously synthesized the RIPL peptide (IPLVVPLRRRRRRRRC) to facilitate selective delivery into hepsin-expressing cancer cells and showed that RIPL peptide-conjugated liposomes (RIPL-L) enhanced the intracellular delivery of fluorescent probes in vitro. In this study, docetaxel-loaded RIPL-L (DTX-RIPL-L) were prepared and evaluated for in vitro drug release, cytotoxicity, and in vivo antitumor efficacy. DTX was successfully encapsulated by pre-loading, with an average encapsulation efficiency and drug loading capacity of 32...
March 21, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28336530/using-chiral-tactoids-as-optical-probes-to-study-the-aggregation-behavior-of-chromonics
#7
Karthik Nayani, Jinxin Fu, Rui Chang, Jung Ok Park, Mohan Srinivasarao
Tactoids are nuclei of an orientationally ordered nematic phase that emerge upon cooling the isotropic phase. In addition to providing a natural setting for exploring chromonics under confinement, we show that tactoids can also serve as optical probes to delineate the role of temperature and concentration in the aggregation behavior of chromonics. For high concentrations, we observe the commonly reported elongated bipolar tactoids. As the concentration is lowered, breaking of achiral symmetry in the director configuration is observed with a predominance of twisted bipolar tactoids...
March 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28334248/photoacclimation-by-arctic-cryoconite-phototrophs
#8
R G Perkins, E Bagshaw, L Mol, C J Williamson, D Fagan, M Gamble, M L Yallop
Cryoconite is a matrix of sediment, biogenic polymer and a microbial community which resides on glacier surfaces. The phototrophic component of this community is well adapted to this extreme environment, including high light stress. Photoacclimation of the cryoconite phototrophic community on Longyearbreen, Svalbard was investigated using in situ variable chlorophyll fluorescence. Rapid light curves (RLCs) and induction recovery curves were used to analyse PSII quantum efficiency, relative electron transport rate and forms of down regulation including non-photochemical quenching (NPQ) and state transitions in cyanobacteria...
February 18, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28331834/ultrasound-guided-electrochemotherapy-for-the-treatment-of-a-clear-cell-thymoma-in-a-cat
#9
Enrico Pierluigi Spugnini, Francesco Menicagli, Michela Pettorali, Alfonso Baldi
A twelve-year-old male castrated domestic shorthair cat was presented for rapidly progressing respiratory distress. The cat was depressed, tachypneic and moderately responsive. Ultrasonography showed a mediastinal mass associated with a significant pleural effusion that needed tapping every five to seven days. Ultrasound guided biopsy yielded a diagnosis of clear cell thymoma upon histopathology. After complete staging procedures, the owner elected to treat the cat with electrochemotherapy (ECT) using systemic bleomycin...
2017: Open veterinary journal
https://www.readbyqxmd.com/read/28331755/phyllodes-tumor-of-the-breast-analysis-of-48-patients
#10
Murat Özgür Kılıç, Serdar Gökay Terzioğlu, Betül Bozkurt, Gül Dağlar
OBJECTIVE: Phyllodes tumor (PT) is a rare biphasic breast neoplasm that accounts for less than 1% of all breast tumors. The aim of this study was to evaluate the clinicopathologic features, diagnostic difficulties, and therapeutic outcomes of patients with PT. MATERIALS AND METHODS: A total of 48 female patients who underwent surgery for PT were included in the study. Patient characteristics, clinicopathologic features of tumors, diagnostic findings, surgical outcomes, adjuvant therapies, and follow-up findings were retrospectively evaluated...
October 2016: J Breast Health (2013)
https://www.readbyqxmd.com/read/28331253/content-of-food-advertising-for-young-adolescents-on-television
#11
Setu Gupta, Swati Kalra, Jaya Shankar Kaushik, Piyush Gupta
BACKGROUND: Food related advertisements on television may have a major influence on the dietary habits and obesity among young adolescents. OBJECTIVE: To evaluate the frequency and typology of food advertisements on most popular television channels, watched by school-going young adolescents in Delhi. METHODOLOGY: Biphasic study to (a) identify the three television channels most frequently watched by administering a questionnaire to 400 school going young adolescents; and (b) view each of these channels for 2 hours per day for 6 days each, and observe the content of advertisements related to foods, beverages, and food outlets...
January 2017: Indian Journal of Community Medicine
https://www.readbyqxmd.com/read/28330431/fabrication-and-characterization-of-biphasic-silk-fibroin-scaffolds-for-tendon-ligament-to-bone-tissue-engineering
#12
Sònia Font Tellado, Walter Bonani, Elizabeth Rosado Balmayor, Peter Föhr, Antonella Motta, Claudio Migliaresi, Martijn van Griensven
Tissue engineering is an attractive strategy for tendon/ligament-to-bone interface repair. The structure and extracellular matrix composition of the interface are complex and allow for a gradual mechanical stress transfer between tendons/ligaments and bone. Thus, scaffolds mimicking the structural features of the native interface may be able to better support functional tissue regeneration. In this study, we fabricated biphasic silk fibroin scaffolds designed to mimic the gradient in collagen molecule alignment present at the interface...
March 23, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28326349/quantitative-in-vivo-micro-computed-tomography-for-assessment-of-age-dependent-changes-in-murine-whole-body-composition
#13
Kim L Beaucage, Steven I Pollmann, Stephen M Sims, S Jeffrey Dixon, David W Holdsworth
Micro-computed tomography (micro-CT) is used routinely to quantify skeletal tissue mass in small animal models. Our goal was to evaluate repeated in vivo micro-CT imaging for monitoring whole-body composition in studies of growth and aging in mice. Male mice from 2 to 52 weeks of age were anesthetized and imaged using an eXplore Locus Ultra and/or eXplore speCZT scanner. Images were reconstructed into 3D volumes, signal-intensity thresholds were used to classify each voxel as adipose, lean or skeletal tissue, and tissue masses were calculated from known density values...
December 2016: Bone Reports
https://www.readbyqxmd.com/read/28324953/electrical-resistance-increases-at-the-tissue-electrode-interface-as-an-early-response-to-nucleus-accumbens-deep-brain-stimulation
#14
Rajas P Kale, Abbas Z Kouzani, Julian Berk, Ken Walder, Michael Berk, Susannah J Tye
The therapeutic actions of deep brain stimulation are not fully understood. The early inflammatory response of electrode implantation is associated with symptom relief without electrical stimulation, but is negated by anti-inflammatory drugs. Early excitotoxic necrosis and subsequent glial scarring modulate the conductivity of the tissue-electrode interface, which can provide some detail into the inflammatory response of individual patients. The feasibility of this was demonstrated by measuring resistance values across a bipolar electrode which was unilaterally implanted into the nucleus accumbens of a rat while receiving continuous deep brain stimulation with a portable back-mounted device using clinical parameters (130Hz, 200μA, 90μs) for 3 days...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324660/single-and-combination-drug-screening-with-aqueous-biphasic-tumor-spheroids
#15
Pradip Shahi Thakuri, Hossein Tavana
Spheroids of cancer cells represent a physiologic model of solid tumors for cancer drug screening. Despite this known benefit, difficulties with generating large quantities of uniformly sized spheroids in standard plates, individually addressing spheroids with drug compounds, and quantitatively analyzing responses of cancer cells have hindered the use of spheroids in high-throughput screening applications. Recently, we addressed this challenge by using an aqueous two-phase system technology to generate a spheroid within an aqueous drop immersed in a second, immiscible aqueous phase...
March 1, 2017: SLAS Discov
https://www.readbyqxmd.com/read/28324353/the-fast-d-protocol-a-simple-method-to-rule-out-traumatic-vascular-injuries-of-the-lower-extremities
#16
Miguel Angel Montorfano, Lisandro Miguel Montorfano, Federico Perez Quirante, Federico Rodríguez, Leonardo Vera, Luca Neri
BACKGROUND: The aim of this study is to assess the accuracy of a Fast Doppler protocol for the examination of an injured lower limb, namely 2-Point Fast Doppler (2PFD), in order to rapidly triage arterial lesions after penetrating trauma. METHODS: The presence of flow and the aspects of the Doppler waveform of the dorsalis pedis artery (DPA) and posterior tibial artery (PTA) of the injured lower limb (2PFD) were evaluated immediately before the execution of a standardized Color Duplex Doppler (SD) evaluation in 149 limbs of 140 patients with gunshot penetrating injuries...
December 2017: Critical Ultrasound Journal
https://www.readbyqxmd.com/read/28323936/the-steroid-metabolome-in-the-isolated-ovarian-follicle-and-its-response-to-androgen-exposure-and-antagonism
#17
Marie Lebbe, Angela E Taylor, Jenny A Visser, Jackson Kirkman-Brown, Teresa K Woodruff, Wiebke Arlt
The ovarian follicle is a major site of steroidogenesis, crucially required for normal ovarian function and female reproduction. Our understanding of androgen synthesis and metabolism in the developing follicle has been limited by sensitivity and specificity issues of previously used assays. Here we used liquid chromatography-tandem mass spectrometry to map the stage-dependent endogenous steroid metabolome in an encapsulated in vitro follicle growth system, from murine secondary through antral follicles. Furthermore, follicles were cultured in the presence of androgen precursors, non-aromatizable active androgen and androgen receptor (AR) antagonist to assess effects on steroidogenesis and follicle development...
February 23, 2017: Endocrinology
https://www.readbyqxmd.com/read/28319876/redefining-periodic-patterns-on-electroencephalograms-of-patients-with-sporadic-creutzfeldt-jakob-disease
#18
Jung-Won Shin, Byeongsoo Yim, Seung Hun Oh, Nam Keun Kim, Sang Kun Lee, Ok-Joon Kim
OBJECTIVE: We aimed to redefine various periodic patterns (PPs) observed on electroencephalography (EEG) in patients with sporadic Creutzfeldt-Jakob disease (sCJD) using the American Clinical Neurophysiology Society's (ACNS) Criteria. METHODS: We analyzed EEG data of 23 patients with sCJD were admitted to two university hospitals between August 2005 and September 2015. RESULTS: We classified PPs on EEG data into three types: irregular periodic discharges (PDs) with superimposed rhythmic activities, appearing at a median of 8weeks after onset (w...
February 5, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28319746/predicting-biphasic-responses-in-binary-mixtures-pelargonic-acid-versus-glyphosate
#19
Regina G Belz, Hans-Peter Piepho
Predicting hormesis in mixtures is challenging, but essential considering that chemical exposures often occur in mixtures and at low doses. This study investigated mixture effects with two herbicides prone to induce hormesis and to interact, namely pelargonic acid versus glyphosate. Five independent mixture experiments were conducted in vitro to assess effects on root growth of lettuce. Mixture effects on the dose were analyzed using classical joint-action models in terms of deviation from the reference model of concentration addition...
March 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28319397/a-scalable-platform-for-structured-and-hybrid-soft-nanocolloids-by-continuous-precipitation-in-a-confined-environment
#20
Victoria E Lee, Chris Sosa, Rui Liu, Robert K Prud'homme, Rodney D Priestley
Geometrically-structured polymer nanocolloids, including Janus nanocolloids, have been widely investigated for their unique properties, which are derived from their anisotropy. Controlled surface decoration with inorganic nanoparticles could induce another level of functionality into structured nanocolloids that could enable applications in fields ranging from re-writeable electronics to biphasic catalysis. Here, we demonstrate Flash NanoPrecipitation (FNP), as a one-step and scalable process platform to manufacture hybrid polymer-inorganic nanocolloids in which one phase is selectively decorated with a metal nanocatalyst by tuning the molecular interactions between the feed ingredients during the process...
March 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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