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Thoracic Fetiform Teratoma: A Case Report of a Very Rare Entity in a Peruvian Hospital
Ludwig Cáceres-Farfán,Wildor Samir Cubas,Franco Albán,Jorge Mantilla-Vásquez,Johny Mayta-Rodríguez,Karen Mendoza-Guerra 대한심장혈관흉부외과학회 2023 Journal of Chest Surgery (J Chest Surg) Vol.56 No.4
Mature fetiform teratoma, or homunculus, is a term coined for a rare variant of teratoma with a prevalence of 0.01% of teratomas. There have been very few cases reported in the world, and its thoracic presentation is extremely unusual. We present the case of a 31-year-old female patient with a history of progressive chest pain in the left hemithorax, associated with dyspnea on moderate exertion and cough. Imaging studies revealed a large intrathoracic tumor visually compatible with a teratoma. Surgical resection by a clamshell approach was successful, and subsequent anatomopathological studies of the operative specimen concluded that the mass was a mature fetiform thoracic teratoma. The treatment of this entity is generally surgical and includes wide resection due to its large adhesive component to surrounding tissues. Thus, the cardiothoracic surgeon must know approaches that allow wide resection, making these cases true surgical challenges.
Vinícius C. De Franco,Gustavo M. B. Castro,Jeaneth Corredor,Daniel Mendes,João E. Schmidt 한국탄소학회 2017 Carbon Letters Vol.21 No.-
Cobalt was electrodeposited onto chemical vapor deposition (CVD) graphene/Si/SiO2 substrates, during different time intervals, using an electrolyte solution containing a low concentration of cobalt sulfate. The intention was to investigate the details of the deposition process (and the dissolution process) and the resulting magnetic properties of the Co deposits on graphene. During and after electrodeposition, in-situ magnetic measurements were performed using an (AGFM). These were followed by ex situ morphological analysis of the samples with ΔtDEP 30 and 100 s by atomic force microscopy in the non-contact mode on pristine CVD graphene/SiO2/Si. We demonstrate that it is possible to electrodeposit Co onto graphene, and that in-situ magnetic measurements can also help in understanding details of the deposition process itself. The results show that the Co deposits are ferromagnetic with decreasing coercivity (HC) and demonstrate increasing magnetization on saturation (MSAT) and electric signal proportional to remanence (Mr), as a function of the amount of the electrodeposited Co. It was also found that, after the end of the dissolution process, a certain amount of cobalt remains on the graphene in oxide form (this was confirmed by X-ray photoelectron spectroscopy), as suggested by the magnetic measurements. This oxide tends to exhibit a limited asymptotic amount when cycling through the deposition/dissolution process for increasing deposition times, possibly indicating that the oxidation process is similar to the graphene surface chemistry.
Vin?cius C. De Franco,Gustavo M. B. Castro,Jeaneth Corredor,Daniel Mendes,Jo?o E. Schmidt 한국탄소학회 2017 Carbon Letters Vol.21 No.-
Cobalt was electrodeposited onto chemical vapor deposition (CVD) graphene/Si/SiO2 substrates, during different time intervals, using an electrolyte solution containing a low concentration of cobalt sulfate. The intention was to investigate the details of the deposition process (and the dissolution process) and the resulting magnetic properties of the Co deposits on graphene. During and after electrodeposition, in-situ magnetic measurements were performed using an (AGFM). These were followed by ex situ morphological analysis of the samples with ΔtDEP 30 and 100 s by atomic force microscopy in the non-contact mode on pristine CVD graphene/SiO2/Si. We demonstrate that it is possible to electrodeposit Co onto graphene, and that in-situ magnetic measurements can also help in understanding details of the deposition process itself. The results show that the Co deposits are ferromagnetic with decreasing coercivity (HC) and demonstrate increasing magnetization on saturation (MSAT) and electric signal proportional to remanence (Mr), as a function of the amount of the electrodeposited Co. It was also found that, after the end of the dissolution process, a certain amount of cobalt remains on the graphene in oxide form (this was confirmed by X-ray photoelectron spectroscopy), as suggested by the magnetic measurements. This oxide tends to exhibit a limited asymptotic amount when cycling through the deposition/dissolution process for increasing deposition times, possibly indicating that the oxidation process is similar to the graphene surface chemistry.
R. Sanchez,J.M. Franco,M.A. Delgado,C. Valencia,C. Gallegos 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.4
Nowadays the lubricating market is demanding new biodegradable or more environmentally acceptable products based on renewable resources as a consequence of progressively more strict environmental regulations. In this framework, this study deals with the design of gel-like dispersions potentially applicable as environmentally friendly lubricating greases. These dispersions were formulated using castor oil and ethyl cellulose/a-cellulose or ethyl cellulose/methyl cellulose blends. In particular, the influence of cellulosic derivatives concentration ratio on the linear viscoelasticity and mechanical stability of the resulting oleogel formulations was studied. The modification of ethyl cellulose/acellulose or ethyl cellulose/methyl cellulose weight ratios allows obtaining some formulations with suitable rheological characteristics and mechanical stability for potential lubricating applications. An important decrease in the values of the linear viscoelasticity functions down to a minimum value was found by increasing ethyl cellulose/a-cellulose or ethyl cellulose/methyl cellulose weight ratios (W) up to a critical value, which depends on both nature of the cellulosic derivatives employed and temperature. Above this critical value, the linear viscoelastic functions increase with W, at temperatures in the range 0–75 8C, and continuously decrease at higher temperatures, i.e. 125 8C. Thermal susceptibility is significantly dampened by reducing ethyl cellulose concentration. Gel-like dispersions formulated with ethyl cellulose/methyl cellulose blends showed appropriate mechanical stabilities to be used as biolubricating greases.
J.E. Martin-Alfonso,G. Moreno,C. Valencia,M.C. Sanchez,C. Gallegos,J.M. Franco 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.5
The main goal of this work was to study the feasibility of using a low-density polyethylene (LDPE) as additive to improve the rheological properties of lithium lubricating greases. The combined effect that both soap and LDPE concentrations exerts on the rheology of lithium lubricating greases and its relationship with grease microstructure were studied according to an experimental design based on the response surface methodology (RSM). Different lubricating grease formulations were manufactured by modifying lithium 12-hydroxystereate and LDPE concentrations. Small-amplitude oscillatory shear (SAOS) and viscous flow measurements, as well as mechanical stability tests, were performed. In addition to these, environmental scanning electronic microscopy (ESEM) was used to determine grease microstructure. LDPE was found to be a useful additive to modify grease rheology, acting as filler in the entangled soap network. The values of both apparent viscosity and linear viscoelasticity functions increase with soap and LDPE concentration. However, the addition of LDPE distorts soapmicrostructural network, yielding greases with lower relative elastic characteristics.
Garci´a-Morales, J. A.,Franco, J. M.,Valencia, C.,Sa´nchez, M. C.,Gallegos, C. 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.3
This paper deals with the influence that the agitation speed, the temperature of processing, and the cooling profile applied during crystallization of the thickening agent exert on some rheological parameters of lubricating greases. With this aim, the in situ reaction between 12-hydroxystearic acid and lithium hydroxide was conducted to form the lithium soap. After the saponification reaction was completed, the crystallization was induced by adding different batches of the lubricating oil and cooling the stirred tank. Torque was measured during the process using a controlled-rotational-speed mixing rheometer from which the energy consumption during processing was evaluated. The Metner-Otto approach was followed to estimate the viscosity of the incipient and final lubricating greases. Linear viscoelastic and viscous flow measurements were performed on the final product. From the experimental results, we conclude that an increase in the temperature applied after the saponification reaction or a decrease in the cooling rate of the freshly prepared grease generally increases the values of the rheological parameters studied. On the other hand, by increasing the rotational speed, the values of the viscoelastic functions were significantly reduced. In addition to this finding, all of these variables affect the energy consumption during the processing. Discrepancies found in the viscosity values obtained from rotational rheometry and torque measurements during the mixing flow are attributed to the fractured layer observed in the gap between the wall and the impeller.
Robotic Surgery for Lung Cancer
Marcello C. Ambrogi,Olivia Fanucchi,Franco Melfi,Alfredo Mussi 대한흉부외과학회 2014 Journal of Chest Surgery (J Chest Surg) Vol.47 No.3
During the last decade the role of minimally invasive surgery has been increased, especially with the introduction of the robotic system in the surgical field. The most important advantages of robotic system are represented by the wristed instrumentation and the depth perception, which can overcome the limitation of traditional thoracoscopy. However, some data still exist in literature with regard to robotic lobectomy. The majority of papers are focused on its safety and feasibility, but further studies with long follow-ups are necessary in order to assess the oncologic outcomes. We reviewed the literature on robotic lobectomy, with the main aim to better define the role of robotic system in the clinical practice.