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https://www.readbyqxmd.com/read/29777705/membrane-proteins-significantly-restrict-exosome-mobility
#1
Mikhail Skliar, Vasiliy S Chernyshev, David M Belnap, German V Sergey, Samer M Al-Hakami, Philip S Bernard, Inge J Stijleman, Rakesh Rachamadugu
Exosomes are membrane nanovesicles implicated in cell-to-cell signaling in which they transfer their molecular cargo from the parent to the recipient cells. This role essentially depends on the exosomes' small size, which is the prerequisite for their rapid migration through the crowded extracellular matrix and into and out of circulation. Here we report much lower exosome mobility than expected from the size of their vesicles, implicate membrane proteins in a substantially impeded rate of migration, and suggest an approach to quantifying the impact...
May 16, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29777681/electrochemical-enzymatic-fenitrothion-sensor-based-on-a-tyrosinase-poly-2-hydroxybenzamide-modified-graphite-electrode
#2
Maria de Fátima Alves, Ricardo Augusto Moreira de Souza Corrêa, Filipe Soares da Cruz, Diego Leoni Franco, Lucas Franco Ferreira
This paper reports the electrosynthesis and characterisation of a polymeric film derived from 2-hydroxybenzamide over a graphite electrode and its application as an enzymatic biosensor for the determination and quantification of the pesticide fenitrothion. The material was analysed by scanning electron microscopy and its electrochemical properties characterised by cyclic voltammetry and electrochemical impedance spectroscopy. The enzyme tyrosinase was immobilised over the modified electrode by the drop and dry technique...
May 16, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29777604/-ethical-aspects-of-the-use-of-mirena-r-iud-in-the-treatment-of-heavy-menstrual-bleeding
#3
Miriam Turiel Miranda, Pau Agulles Simó
The levonorgestrel-releasing intrauterine device known as Mirena IUD(r) (20mcg/24h) is nowadays considered among the leading resources in the treatment of heavy menstrual bleeding. Nonetheless, due to either its effect of prevention of conception and especially to the possibility that it may also have an anti-implantation effect, there is a founded concern on whether its therapeutic use may be ethically licit. This article engages in an exhaustive literature review in order to ascertain the mechanism of action of Mirena(r) IUD, in view of an ethical evaluation of its therapeutic use, keeping in mind those two unwanted effects...
May 2018: Cuadernos de Bioética: Revista Oficial de la Asociación Española de Bioética y Ética Médica
https://www.readbyqxmd.com/read/29777228/effects-of-clomiphene-citrate-on-male-obesity-associated-hypogonadism-a-randomized-double-blind-placebo-controlled-study
#4
Andressa Heimbecher Soares, Nidia Celeste Horie, Lucas Augusto Piccinin Chiang, Bruno Caramelli, Mariana Gomes Matheus, Alexandre Holthausen Campos, Luciana Cavalheiro Marti, Fernanda Agostini Rocha, Marcio C Mancini, Elaine Maria Frade Costa, Cintia Cercato
BACKGROUND: Obesity causes secondary hypogonadism (HG) in men. Standard testosterone (T) replacement therapy improves metabolic parameters but leads to infertility. OBJECTIVE: To evaluate clomiphene citrate (CC) treatment of adult men with male obesity-associated secondary hypogonadism (MOSH). DESIGN: Single-center, randomized, double-blind, placebo-controlled trial. PARTICIPANTS: Seventy-eight men aged 36.5 ± 7...
May 17, 2018: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/29777034/membrane-fluctuations-and-acidosis-regulate-cooperative-binding-of-marker-of-self-cd47-with-macrophage-checkpoint-receptor-sirp%C3%AE
#5
Jan Steinkühler, Bartosz Różycki, Cory Alvey, Reinhard Lipowsky, Thomas R Weikl, Rumiana Dimova, Dennis E Discher
Cell-cell interactions that result from membrane proteins binding weakly in trans can cause accumulations in cis that suggest cooperativity and thereby an acute sensitivity to environmental factors. The ubiquitous "marker of self" protein CD47 binds weakly to SIRPα on a macrophage, which leads to accumulation of SIRPα at a phagocytic synapse and ultimately to inhibition of engulfment of 'self' cells - including cancer cells. We reconstituted this macrophage checkpoint with CD47-GFP displayed on giant vesicles generated from plasma membranes and then imaged vesicles adhering to SIRPα immobilized on a surface...
May 18, 2018: Journal of Cell Science
https://www.readbyqxmd.com/read/29776623/nonrestorative-sleep-in-healthy-young-adults-without-insomnia-associations-with-executive-functioning-fatigue-and-pre-sleep-arousal
#6
Ruben Tinajero, Paula G Williams, Matthew R Cribbet, Holly K Rau, Daniel L Bride, Yana Suchy
OBJECTIVES: Previous research suggests that nonrestorative sleep (NRS), even in the absence of insomnia symptoms or other sleep disorders, may be associated with daytime dysfunction. This study examined the association between NRS and daytime dysfunction in healthy adults screened for insomnia and sleep apnea. DESIGN: Multi-day assessment approach. SETTING: Community-based adults and college students. PARTICIPANTS: Healthy young adults without insomnia and sleep apnea (n = 79; 68% female, mean age = 27...
June 2018: Sleep Health
https://www.readbyqxmd.com/read/29776584/dopamine-assisted-co-deposition-an-emerging-and-promising-strategy-for-surface-modification
#7
REVIEW
Wen-Ze Qiu, Hao-Cheng Yang, Zhi-Kang Xu
Mussel-inspired chemistry based on polydopamine (PDA) deposition has been developed as a facile and universal method for the surface modification of various materials. However, the inherent shortcomings of PDA coatings still impede their practical applications in the development of functional materials. In this review, we introduce the recent progress in the emerging dopamine-assisted co-deposition as a one-step strategy for functionalizing PDA-based coatings, and improving them in the aspects of deposition rate, morphology uniformity, surface wettability and chemical stability...
April 27, 2018: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/29776548/a-label-free-electrochemical-biosensor-for-direct-detection-of-rack-1-by-using-disposable-low-cost-and-reproducible-ito-based-electrode
#8
Hakan Törer, Elif Burcu Aydın, Mustafa Kemal Sezgintürk
In this study we designed an ultrasensitive electrochemical immunosensor for RACK 1 detection using 11-cyanoundecyltrimethoxysilane (11-CUTMS) as a immobilization matrix to immobilize biorecognition element. The used silane agent (11-CUTMS) provides a favorable platform for efficient loading of anti-RACK 1 antibody. The effective loading of the biorecognition element on the 11-CUTMS matrix was monitored by scanning electron microscopy (SEM), atomic force microscopy (AFM) images and fourier transform infrared spectroscopy (FTIR) spectra...
September 18, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29776403/rostral-cranial-fossa-as-a-site-for-cerebrospinal-fluid-drainage-volumetric-studies-in-dog-breeds-of-different-size-and-morphotype
#9
Wojciech Sokołowski, Norbert Czubaj, Michał Skibniewski, Karolina Barszcz, Marta Kupczyńska, Wojciech Kinda, Zdzisław Kiełbowicz
BACKGROUND: Hydrocephalus is a multifactorial condition, whose aetiology is not fully understood. Congenital hydrocephalus frequently occurs in small and brachycephalic dog breeds. Although it is widely accepted that the cribriform plate located in the rostral cranial fossa (RCF) is a site of cerebrospinal fluid (CSF) drainage, the RCF has not been studied extensively. Literature reports indicate that a decreased caudal cranial fossa (CCF) volume in the course of the Chiari-like malformation may obstruct CSF circulation...
May 18, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29776129/assay-based-on-electrical-impedance-spectroscopy-to-discriminate-between-normal-and-cancerous-mammalian-cells
#10
Fabián Eduardo Giana, Fabián José Bonetto, Mariela Inés Bellotti
In this work we present an assay to discriminate between normal and cancerous cells. The method is based on the measurement of electrical impedance spectra of in vitro cell cultures. We developed a protocol consisting on four consecutive measurement phases, each of them designed to obtain different information about the cell cultures. Through the analysis of the measured data, 26 characteristic features were obtained for both cell types. From the complete set of features, we selected the most relevant in terms of their discriminant capacity by means of conventional statistical tests...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29775856/a-simple-ultrasensitive-electrochemical-sensor-for-simultaneous-determination-of-gallic-acid-and-uric-acid-in-human-urine-and-fruit-juices-based-on-zirconia-choline-chloride-gold-nanoparticles-modified-carbon-paste-electrode
#11
Seyed Alireza Shahamirifard, Mehrorang Ghaedi, Zahra Razmi, Shaaker Hajati
The determination of gallic acid (GA) and uric acid (UA) is essential due to their biological properties. Numerous methods have been reported for the analysis of GA and UA in various real samples. However, the development of a simple, rapid and practical sensor still remains a great challenge. Here, a carbon paste electrode (CPE) was modified by nanocomposite containing zirconia nanoparticles (ZrO2 NPs), Choline chloride (ChCl) and gold nanoparticles (AuNPs) to construct ZrO2 -ChCl-AuNPs/CPE as electrochemical sensor for the simultaneous electro-oxidation of GA and UA...
May 8, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29775438/breakdown-of-water-super-permeation-in-electrically-insulating-graphene-oxide-films-role-of-dual-interlayer-spacing
#12
M K Kavitha, Tushar Sakorikar, Pramitha V, Manu Jaiswal
Conventional graphene oxide is characterized by low sp<sup>2</sup> content in a sp<sup>3</sup> rich matrix, which is responsible both for electrical insulation and water super-permeation. Upon reduction, electrical conduction is achieved at the expense of water permeation ability. Here, we demonstrate that charge conduction and water permeation can be simultaneously restricted in a functionalized form of graphene oxide. Gravimetric studies reveal that diffusion of water vapour through glassy polymer membranes is arrested by loading hydrophobic form of GO in the polymer matrix, even as such water inhibition cannot be realized by substantially increasing the thickness of the bare polymer...
May 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29775272/remarkable-enhancement-in-the-photoelectric-performance-of-uniform-flower-like-mesoporous-fe3o4-wrapped-in-nitrogen-doped-graphene-networks
#13
Jixin Yao, Kang Zhang, Wen Wang, Xueqin Zuo, Qun Yang, Huaibao Tang, Mingzai Wu, Guang Li
The porous structure and excellent specific surface area are superior for use as a counter electrode (CE) material. In addition, N-doped graphene possesses a remarkable electron-transfer pathway and many active sites. Therefore, a novel idea is to wrap uniform flower-like mesoporous Fe3O4 (Fe3O4UFM) in a N-doped graphene (N-RGO) network structure to enhance the power conversion efficiency (PCE). The hybrid materials of Fe3O4UFM@N-RGO are first used as a CE in dye-sensitized solar cells (DSSCs), showing a preeminent conductive interconnected 3D porous structure with more catalytic activity sites and a better ability for and a faster reaction rate of charge transfer, resulting in quicker reduction of I_3^- than Pt...
May 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29775206/prospective-determination-of-aspirin-sensitivity-in-patients-resistant-to-low-dose-aspirin-a-proof-of-concept-study
#14
Erica S Westphal, Michelle Rainka, Michelle Amsler, Traci Aladeen, Caitlin Wisniewski, Vernice Bates, Fran M Gengo
This study tested the capability of an assay to predict aspirin response and reduce ischemic events, and healthcare costs, and delays to optimal treatment. Patients who needed aspirin in the course of normal medical care were included. Patients were excluded if they had disorders affecting platelet function, alcohol use within 24 hours of a test, or NSAID use. Dose escalation of chewable aspirin from 81 mg, to 162 mg, to 325 mg daily occurred based on the results of whole blood impedance aggregation testing to the agonists, collagen (1ug/mL, 5 ug/mL) and arachidonate (0...
May 18, 2018: Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/29774346/dft-insight-into-the-effect-of-potassium-on-the-adsorption-activation-and-dissociation-of-co-2-over-fe-based-catalysts
#15
Xiaowa Nie, Linlin Meng, Haozhi Wang, Yonggang Chen, Xinwen Guo, Chunshan Song
Catalytic conversion of CO2 including hydrogenation has attracted great attention as a method for chemical fixation of CO2 in combination with other techniques such as CO2 capture and storage. Potassium is a well-known promotor for many industrial catalytic processes such as in Fischer-Tropsch synthesis. In this work, we performed density functional theory (DFT) calculations to investigate the effect of potassium on the adsorption, activation, and dissociation of CO2 over Fe(100), Fe5C2(510) and Fe3O4(111) surfaces...
May 18, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29774211/3d-printed-e-tongue
#16
Gabriel Gaál, Tatiana A da Silva, Vladimir Gaál, Rafael C Hensel, Lucas R Amaral, Varlei Rodrigues, Antonio Riul
Nowadays, one of the biggest issues addressed to electronic sensor fabrication is the build-up of efficient electrodes as an alternative way to the expensive, complex and multistage processes required by traditional techniques. Printed electronics arises as an interesting alternative to fulfill this task due to the simplicity and speed to stamp electrodes on various surfaces. Within this context, the Fused Deposition Modeling 3D printing is an emerging, cost-effective and alternative technology to fabricate complex structures that potentiates several fields with more creative ideas and new materials for a rapid prototyping of devices...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29774130/targeting-invadopodia-mediated-breast-cancer-metastasis-by-using-abl-kinase-inhibitors
#17
Tomer Meirson, Alessandro Genna, Nikola Lukic, Tetiana Makhnii, Joel Alter, Ved P Sharma, Yarong Wang, Abraham O Samson, John S Condeelis, Hava Gil-Henn
Metastatic dissemination of cancer cells from the primary tumor and their spread to distant sites in the body is the leading cause of mortality in breast cancer patients. While researchers have identified treatments that shrink or slow metastatic tumors, no treatment that permanently eradicates metastasis exists at present. Here, we show that the ABL kinase inhibitors imatinib, nilotinib, and GNF-5 impede invadopodium precursor formation and cortactin-phosphorylation dependent invadopodium maturation, leading to decreased actin polymerization in invadopodia, reduced extracellular matrix degradation, and impaired matrix proteolysis-dependent invasion...
April 24, 2018: Oncotarget
https://www.readbyqxmd.com/read/29773905/establishing-anaerobic-hydrocarbon-degrading-enrichment-cultures-of-microorganisms-under-strictly-anoxic-conditions
#18
Rafael Laso-Pérez, Viola Krukenberg, Florin Musat, Gunter Wegener
Traditionally, the description of microorganisms starts with their isolation from an environmental sample. Many environmentally relevant anaerobic microorganisms grow very slowly, and often they rely on syntrophic interactions with other microorganisms. This impedes their isolation and characterization by classic microbiological techniques. We developed and applied an approach for the successive enrichment of syntrophic hydrocarbon-degrading microorganisms from environmental samples. We collected samples from microbial mat-covered hydrothermally heated hydrocarbon-rich sediments of the Guaymas Basin and mixed them with synthetic mineral medium to obtain sediment slurries...
June 2018: Nature Protocols
https://www.readbyqxmd.com/read/29772414/construction-of-p-n-heterojunction-film-of-cu-2-o-%C3%AE-fe-2-o-3-for-efficiently-photoelectrocatalytic-degradation-of-oxytetracycline
#19
Ling Cheng, Yulu Tian, Jingdong Zhang
A p-n heterojunction film of Cu2 O/α-Fe2 O3 was constructed by electrodepositing p-type Cu2 O microcubes on liquid phase deposited film of n-type α-Fe2 O3 . The surface morphology, the crystal phase and composition of Cu2 O/α-Fe2 O3 heterojunction film were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The enhanced absorption in the visible light region was observed in UV-visible diffuse reflectance spectra. Meanwhile, an efficiently improved separation and faster transfer of photogenerated electrons and holes were revealed by photoluminescence spectra and electrochemical impedance spectra...
April 30, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29772186/lentivirus-mediated-down-regulation-of-ck2%C3%AE-inhibits-proliferation-and-induces-apoptosis-of-malignant-lymphoma-and-leukemia-cells
#20
Li Jiang, Jinghui Zhang, Naifeng Hu, Aichun Liu, Hailong Zhu, Lianqiao Li, Yuyang Tian, Xue Chen, Lina Quan
CK2α is highly expressed in many malignant tumor tissues, including lymphomas and leukemia. To investigate the role of CK2α in proliferation and apoptosis of malignant lymphomas and leukemia, two lymphomas cell lines and one leukemia cell line were infected with CK2α shRNA lentivirus or negative control shRNA lentivirus, and stably infected cell lines were established. Real-time PCR and western blot results showed that the mRNA and protein levels of CK2α were significantly reduced in CK2α knockdown cells...
May 17, 2018: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
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