On the resolution and image intensity of the field-ion microscope

High resolution and image intensity of field ion microscope at low temperature

On the cause of the flat-spot phenomenon observed in silicon solar cells at low temperatures and low intensities

A model is presented that explains the "flat-spot" (FS) power loss phenomenon observed in silicon solar cells operating deep space (low temperature, low intensity) conditions. Evidence is presented suggesting that the effect is due to localized metallurgical interactions between the silicon substrate and the contact metallization. These reactions are shown to result in localized regions in which the PN junction is destroyed and replaced with a metal-semiconductor-like interface. The effects of thermal treatment, crystallographic orientation, junction depth, and metallurization are presented along with a method of preventing the effect through the suppression of vacancy formation at the free surface of the contact metallization. Preliminary data indicating the effectiveness of a TiN diffusion barrier in preventing the effect are also given

Ginecopsiquiatría: su inserción docente-asistencial en Ginecología

Las etapas de la vida de la mujer transcurren incesantemente por modificaciones hormonales que, desde lo fisiológico a lo patológico, llegan a impactar en la salud integral de la misma Con frecuencia creciente se advierten situaciones con repercusión sobre la salud mental y expresiones clínicas ginecológicas que se correlacionan y necesita la intervención de distintas especialidades para su interpretación y abordaje terapéutico. Es precisamente la Ginecopsiquiatría la disciplina que advierte lo mencionado y que motiva su inserción en los programas educativos y asistenciales para establecer criterios y pautas de atención de los desórdenes no sólo psicosomáticos sino en toda la esfera de atención de la salud integral de la mujer.Facultad de Ciencias Médica

Innovaciones tecnológicas en Ginecología: sling (TOT) en el tratamiento de la incontinencia de orina de esfuerzo femenina

La incontinencia de orina es una patología frecuente en la mujer, con una connotación significativa para su calidad de vida. La historia de tratamientos para la misma y la terapéutica quirúrgica en los casos indicados, no mostró resultados favorables a lo largo de los años. A partir de la teoría integral de la continencia de Ulstern y Petrus (1996) se han producido cambios importantes en la evaluación y manejo de la paciente incontinente.Nuevos conceptos han derivado en el desarrollo de técnicas focalizadas a nivel de la uretra media,con procedimientos libres de tensión y mínimamente invasivos. Delorme (2001) diseñó una cincha suburetral y aguja helicoidal con pasaje a través del orificio obturador, convirtiéndose en la técnica de elección para el tratamiento de la incontinencia de orina de esfuerzo en la actualidadFacultad de Ciencias Médica

Endometrosis: su repercusión en la salud reproductiva

Uno de los cuadros clínicos más significativos por su incidencia sobre el dolor pelviano y la fertilidad lo constituye la endometrosis. Es una patología que genera dismenorrea progresiva y limitante para la calidad de vida de la mujer, y que constituye hoy una entidad prevalente que genera preocupación como problema de la salud pública. Su incidencia creciente en mujeres en edad fértil genera la postergación de su fertilidad ,a expensas,básicamente,de la priorización del dolor como síntoma cardinal y la dificultad y demora que suele presentar para su diagnóstico adecuado y la aplicación de terapéuticas no siempre acordes a la dimensión que representa.Facultad de Ciencias Médica

Innovaciones tecnológicas en Ginecología: sling (TOT) en el tratamiento de la incontinencia de orina de esfuerzo femenina

La incontinencia de orina es una patología frecuente en la mujer, con una connotación significativa para su calidad de vida. La historia de tratamientos para la misma y la terapéutica quirúrgica en los casos indicados, no mostró resultados favorables a lo largo de los años. A partir de la teoría integral de la continencia de Ulstern y Petrus (1996) se han producido cambios importantes en la evaluación y manejo de la paciente incontinente.Nuevos conceptos han derivado en el desarrollo de técnicas focalizadas a nivel de la uretra media,con procedimientos libres de tensión y mínimamente invasivos. Delorme (2001) diseñó una cincha suburetral y aguja helicoidal con pasaje a través del orificio obturador, convirtiéndose en la técnica de elección para el tratamiento de la incontinencia de orina de esfuerzo en la actualidadFacultad de Ciencias Médica

Innovaciones tecnológicas en Ginecología: sling (TOT) en el tratamiento de la incontinencia de orina de esfuerzo femenina

La incontinencia de orina es una patología frecuente en la mujer, con una connotación significativa para su calidad de vida. La historia de tratamientos para la misma y la terapéutica quirúrgica en los casos indicados, no mostró resultados favorables a lo largo de los años. A partir de la teoría integral de la continencia de Ulstern y Petrus (1996) se han producido cambios importantes en la evaluación y manejo de la paciente incontinente.Nuevos conceptos han derivado en el desarrollo de técnicas focalizadas a nivel de la uretra media,con procedimientos libres de tensión y mínimamente invasivos. Delorme (2001) diseñó una cincha suburetral y aguja helicoidal con pasaje a través del orificio obturador, convirtiéndose en la técnica de elección para el tratamiento de la incontinencia de orina de esfuerzo en la actualidadFacultad de Ciencias Médica

LigaSure Haemorrhoidectomy versus Conventional Diathermy for IV-Degree Haemorrhoids: Is It the Treatment of Choice? A Randomized, Clinical Trial

Introduction. Milligan-Morgan haemorrhoidectomy performed with LigaSure system (LS) seems to be mainly effective where a large tissue demolition is required. This randomized study is designed to compare LigaSure haemorrohidectomy with conventional diathermy (CD) for treatment of IV-degree haemorrhoids. Methods. 52 patients with IV-degree haemorrhoids were randomized to two groups (conventional diathermy versus LigaSure haemorrhoidectomy). They were evaluated on the basis of the following main outcomes: mean operative time, postoperative pain, day of discharge, early and late complications. The time of recovery of work was also assessed. All patients had a minimum follow-up of twelve months (range 12-24). All data were statistically evaluated. Results. 27 patients were treated by conventional diathermy, 25 by LigaSure. The mean operative time was significantly shorter in LS, such as postoperative pain, mainly lower on the third and fourth postoperative day: moreover pain disappeared earlier in LS than CD. The time off-work was shorter in LS, while there was no difference in hospital stay and overall complications rate. Conclusions. LigaSure is an effective instrument when a large tissue demolition is required. This study supports its use as treatment of choice for IV degree haemorrhoids, even if the procedure is more expansive than conventional operation

The first case of acinic cell carcinoma of the breast within a fibroadenoma: Case report

AbstractA case of acinic cell carcinoma of the breast is reported in a 26-year-old woman. She presented a lump in her right breast, that seemed to be a fibroadenoma. The open biopsy revealed a well-bordered fibroadenoma, together with a proliferation of cells characterized by serous acinar differentiation and eosinophilic cytoplasmic granules. Tumor cells stained for amylase, lysozyme, α-1-antichymotripsin, epithelial membrane antigen, S-100 protein, pan-cytokeratin, cytokeratin 7 and E-cadherin. Estrogen receptor, progesterone receptor, human epidermal growth factor receptor 2 overexpression, CD10, P63, smooth muscle actin, cytokeratin 5/6 were negative. The sentinel node was negative. 8 months after surgery she is in good clinical conditions without recurrence or metastases

Intragastric gastric band migration: erosion: an analysis of multicenter experience on 177 patients

BACKGROUND: Laparoscopic adjustable gastric banding (LAGB) has proven to be a safe and effective surgical treatment for morbid obesity. It can be a simple, fast, reversible, anatomy-preserving procedure. Despite these advantages, its long-term efficacy came into question by the occurrence of complications such as intragastric band migration. Consistent information regarding this complication is still lacking. Treatment for migration is still being debated as well. Most of the inconsistencies of these data stem from the very low number of patients reported in single-center experiences or case reports. Lack of multicenter experience is evident. The aim of this study was to perform a retrospective analysis of data on intragastric migration in a large multicenter cohort of patients who underwent LAGB. METHODS: A retrospective multicenter study on LAGB patients was performed. Data had been entered into a prospective database of the Italian Group for LapBand(®) (GILB) since January 1997. Pars flaccida and perigastric positioning were considered along with different kinds of gastric bands by the same manufacturer. Time of diagnosis, mean body mass index (BMI), presentation symptoms, and conservative and surgical therapy of intragastric migration were considered. RESULTS: From January 1997 to December 2009, a total of 6,839 patients underwent LAGB and their data were recorded [5,660 females, 1,179 males; mean age 38.5 ± 18.2 years (range 21-62 years); mean BMI = 46.7 ± 7.7 kg/m(2) (range 37.3-68.3); excess weight (EW) 61.8 ± 25.4 kg (range 36-130); %EW 91.1 ± 32.4 % (range 21-112 %)]. A total of 177 of 6,839 (2.5 %) intragastric erosions were observed. According to the postoperative time of follow-up, the diagnosis of intragastric migration was made in 74 (41.8 %), 14 (7.9 %), 38 (21.4 %), 40 (22.6 %), 6 (3.4 %), and 4 (2.2 %) banded patients at 6-12, 24, 36, 48, 60, and 72 months after banding, respectively. Most of intragastric band migration during the first 2 years occurred in bands with no or a few milliliters of filling. In patients with late erosion, the bands were adjusted several times; no band was overfilled but one was filled to the maximum or submaximum with a maximum of two adjustments. Erosions diagnosed during the first 24 months were related to the experience of the surgical staff, while late erosions were not. CONCLUSIONS: Intragastric band migration or band erosion is a rare, disturbing, and usually not life-threatening complication of gastric banding. Its pathogenesis is probably linked to different mechanisms in early (technical failure in retrogastric passage) or late (band management) presentation. It is usually asymptomatic and there is no pathognomonic presentation. A wide range of therapeutic options are available, from simple endoscopic or laparoscopic removal to early or late band replacement or other bariatric procedure. More experience and more studies are needed to lower its presentation rate and definitively clarify its pathogenesis to address the right therapeutic option