Spontaneous acute subdural hematoma as an initial presentation of choriocarcinoma: A case report

<p>Abstract</p> <p>Introduction</p> <p>Diverse sequelae of central nervous system metastasis of choriocarcinoma have been reported, including infarction, intra or extra axial hemorrhages, aneurysm formation and carotid-cavernous fistula. Here we report a case of subdural hematoma as the first presentation of choriocarcinoma.</p> <p>Case presentation</p> <p>The patient is a 34-year-old woman whose initial presentation of widely metastatic choriocarcinoma was an acute subdural hematoma, requiring decompressive craniectomy. Histopathologic examination of the tissue showed no evidence of choriocarcinoma, but the patient was found to have diffuse metastatic disease and cerebrospinal fluid indices highly suggestive of intracranial metastasis.</p> <p>Conclusion</p> <p>Choriocarcinoma frequently metastasizes intracranially. We review the diverse possible manifestations of this process. In addition, the cerebrospinal fluid:serum beta-human chorionic gonadotropin ratio is an important factor in diagnosing these cases. Finally, the role of the neurosurgeon is discussed.</p

Monodisperse Pt(0)/DPA@GO nanoparticles ashighly active catalysts for alcohol oxidation anddehydrogenation of DMAB

Addressed herein, monodisperse platinum nanoparticles (Pt (0)/DPA@GO NPs), supported on graphene oxide (GO), have been prepared by sonochemical double solvent reduction method by the help of dipropylamine (DPA) as a stabilizer at room temperature and used as a catalyst for both C1 to C3 alcohol oxidation reaction and the dehydrogenation of dimethylamine-borane ((CH3)2NHBH3) at room temperature. Monodisperse Pt (0)/DPA@GO NPs were characterized by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscopy (TEM), ICP-OES, and electrochemical measurements (CV). The catalytic performance of the monodisperse Pt NPs demonstrated that they were highly efficient and reusable catalysts even at low temperature for both methanol, ethanol and 2-propanol oxidations. The prepared nanoparticles can also catalyse the dehydrogenation of DMAB with very high activity (TOF = 35.82 h-1) at room temperature. The prepared monodisperse Pt (0)/DPA@GO NPs have ?11.6, 16.8 and 7.61 times higher catalytic activities than the commercially available Pt (ETEK) catalyst towards C1 to C3 alcohol oxidation reactions, respectively. The exceptional catalytic activity and stability of highly efficient monodisperse Pt nanoparticles towards agglomeration leaching and CO poisoning allow these particles to be recycled and reused in the catalysis of DMAB dehydrogenation and C1 to C3 alcohol oxidation. After fifth subsequent reaction and recovery cycles, the prepared nanocatalyst retained almost &gt;80% activity towards the complete dehydrogenation of DMAB and C1 to C3 alcohol oxidation. © Copyright 2016, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.213M 448The authors would like to thank to TUBITAK (213M 448) for the financial support. Appendix

New Pt(0) Nanoparticles as Highly Active and Reusable Catalysts in the C1–C3 Alcohol Oxidation and the Room Temperature Dehydrocoupling of Dimethylamine-Borane (DMAB)

New Pt(0) nanoparticles were easily and reproducibly prepared by the simultaneous reduction method using 1-butylamine (BA) and tributylamine (TBA) for the first time as capturing ligands at room temperature. X-ray diffraction, X-ray photoelectron microscopy and transmission electron microscopy measurements verify the formation of well-dispersed Pt(0) nanoparticles [~3.63 and ~3.98 nm for catalysts prepared using BA (catalyst I) and TBA (catalyst II), respectively] on an activated carbon surface. The catalytic performances of these nanoparticles in terms of activity, isolability and reusability were investigated for both alcohol oxidation and the dehydrocoupling of dimethylamine-borane (DMAB). These nanoparticles were shown to be as active and reusable heterogeneous catalysts even at room temperature. The prepared catalysts can catalyze the dehydrogenation of DMAB with one of the highest known activities at room temperature and also C1–C3 alcohol oxidation with very high electrochemical activities. © 2015, Springer Science+Business Media New York

Reduced graphene oxide (rGO) as highly effective material for the ultrasound assisted boric acid extraction from ulexite ore

In this study, an investigation of the optimum conditions to extract boric acid from ulexite mineral was examined for the first time to explore the boric acid extraction yield by employing a new extraction process, ultrasound-assisted extraction (UAE) by the help of reduced graphene oxide (rGO). Moreover, the influence of rGO has been investigated on the extraction of boric acid from ulexite mineral. Besides, the amount of extraction of boric acid from ulexite depends on reaction conditions. For this reason, the impacts of various solvent/solid ratio, pH, extraction time, and extraction temperature on the yield were investigated by the conductometric method. Experiments with rGO were carried out using one-factor-at-a-time methodology. Several experimental situations (with or without rGO) were used in order to compare the boric acid yield. It was explored that the amount of the boric acid extraction was increased importantly in the presence of rGO. Also, thermo-gravimetric assay (TG-DTA), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses were utilized for the characterization of materials. Under optimum conditions, the yield was calculated as about 93–94% by the help of rGO, which is a greater value than the yields reported in the literature. © 2016 Institution of Chemical Engineers2014-05We thank to the personnel of the Mining Engineering Department of Dokuz Eylul University (Turkey) for their help in material grinding and sizing, mineral processing and enrichment. We also would like to acknowledge to UBAP ( 2013/MF 004 ) and DPU-BAP ( 2014-05 ) project for the financial support. Appendix

Rapid, sensitive, and reusable detection of glucose by highly monodisperse nickel nanoparticles decorated functionalized multi-walled carbon nanotubes

PubMed ID: 28129630Addressed herein, functionalized multi-walled carbon nanotube (MWCNT) supported highly monodisperse nickel nanoparticles modified on glassy carbon electrode (Ni@f-MWCNT/GCE) were synthesized through microwave assisted method and examined for non-enzymatic glucose sensing in ionic liquids by cyclic voltammetry and chronoamperometry. The results of Ni@f-MWCNT/GCE electrode were compared with Ni NPs/GCE electrode and the results revealed that f-MWCNTs increased the electrocatalytic properties of Ni nanoparticles regarding glucose oxidation. They also demonstrated a good linear span of 0.05–12.0 mM and a detection boundary of 0.021 µM. Specifically, in the amperometric signal of the electrodes after 200th cycles, no major change was observed. This non-enzymatic glucose sensor presents one of the record electrocatalytic activity, stability and response towards glucose under the optimized situations. As a result, prepared novel Ni@f-MWCNT/GCE was utilized to detect glucose in real serum species. © 2017 Elsevier B.V.2016-75, 2014-05 Academy of Health SciencesThis research was supported by Dumlupinar University (2014-05, 2016-75). The partial supports by Science Academy and FABED are gratefully acknowledged

Synthesis of clock trees for sampled-data analog IC blocks

Due to copyright restrictions, the access to the full text of this article is only available via subscription.This paper describes a methodology for automated design of clock trees in Sampled-Data Analog Circuits (SDACs). The current practice in the industry and academia for clock tree design of SDACs is a manual process, which is time-consuming and error-prone. Clock tree design in digital domain, however, is fully automated and is carried out by what we call Clock Tree Synthesis (CTS) software. In spite of some critical differences, SDAC clock tree design problem has fundamental similarities with its digital counterpart. As a result, we were able to construct a methodology for SDACs around a commercial digital CTS software and a set of Perl & Tcl scripts. We will explain our methodology using a 10-bit 180 MHz 2-stage ADC as a test circuit.TÜBİTA