Search results for "MAM"

Mammographic images segmentation based on chaotic map clustering algorithm

2013

Background: This work investigates the applicability of a novel clustering approach to the segmentation of mammographic digital images. The chaotic map clustering algorithm is used to group together similar subsets of image pixels resulting in a medically meaningful partition of the mammography. Methods: The image is divided into pixels subsets characterized by a set of conveniently chosen features and each of the corresponding points in the feature space is associated to a map. A mutual coupling strength between the maps depending on the associated distance between feature space points is subsequently introduced. On the system of maps, the simulated evolution through chaotic dynamics leads…

Steroidal glycosides from the Vietnamese cultivar Cordyline fruticosa “Fairchild red”

2021

Abstract A phytochemical study of Cordyline fruticosa “Fairchild red” (Asparagaceae) from Vietnam, led to the isolation of fourteen steroidal glycosides, including twelve previously undescribed along with two known ones. Ten compounds were obtained by successive solid/liquid chromatographic methods from an aqueous-ethanolic extract of the roots, and four from the aerial parts. Their structures were elucidated mainly by spectroscopic analysis 2D NMR and mass spectroscopy (ESI-MS), as spirostanol glycosides, 5α-spirost-25(27)-ene-1β,3β,4α-triol 1-O-β-D-fucopyranoside, 5α-spirost-(25)27-ene-1β,3β,4α-triol 1-O-β-D-xylopyranoside, 5α-spirost-(25)27-ene-1β,3β,4α-triol 1-O-α-L-rhamnopyranosyl-(1 →…

Plastic and cosmetic surgery of the male breast

2020

The thorax has a fundamental role in the aesthetic of the male body: Congenital or acquired alterations are experienced as extremely frustrating clinical situations. Most breast surgery texts briefly mention gynecomastia, but no text comprehensively addresses the male breast and thorax, including reconstructive and cosmetic surgery and surgery in transgender patients. This gap is now thoroughly filled by Plastic and Cosmetic Surgery of the Male Breast: After introducing principles of anatomy and aesthetics for the male thorax, the first part focusses on the main congenital malformations and their treatment; the main benign acquired pathologies and their treatment (including an ample section…

Direct Anodic Dehydrogenative Cross- and Homo-Coupling of Formanilides

2018

Impact of the Covid-19 pandemic on diagnosis of breast cancer at the Oncology Center of Latvia 2020

2022

Krūts vēzis ir visbiežāk sastopamais ļaundabīgais audzējs sievietēm pasaulē. Latvijā ir valsts organizēta krūts vēža skrīninga programma sievietēm vecumā no 50 līdz 69 gadiem, tomēr krūts vēža skrīninga programmas atsaucība ir zema, kas varētu būt iemesls augstajam mirstības rādītājam. Covid-19 pandēmijas dēļ 2020. gadā Latvijā onkoloģisko pacientu diagnostika un ārstēšana netika pārtraukta, taču periodā no 13. marta līdz 10. jūnijam tika īslaicīgi pārtraukta skrīninga uzaicinājuma vēstuļu izsūtīšana. Kā arī nereti pacienti ar krūts vēža simptomiem un sūdzībām nevērsās pie ārsta, jo pandēmijas laikā atturētājs apmeklēt ārstniecības iestādi. Minētie faktori varētu rezultēties ar vēl novēlotā…

Anti-Hypotensive Treatment and Endothelin Blockade Synergistically Antagonize Exercise Fatigue in Rats under Simulated High Altitude

2013

Rapid ascent to high altitude causes illness and fatigue, and there is a demand for effective acute treatments to alleviate such effects. We hypothesized that increased oxygen delivery to the tissue using a combination of a hypertensive agent and an endothelin receptor A antagonist drugs would limit exercise-induced fatigue at simulated high altitude. Our data showed that the combination of 0.1 mg/kg ambrisentan with either 20 mg/kg ephedrine or 10 mg/kg methylphenidate significantly improved exercise duration in rats at simulated altitude of 4,267 m, whereas the individual compounds did not. In normoxic, anesthetized rats, ephedrine alone and in combination with ambrisentan increased heart…

Hexakis(dimethylformamide)iron(II) complex cation in hexahalorhenate(IV)-based salts: synthesis, X-ray structure and magnetic properties

2018

Two iron(II)-rhenium(IV) compounds of general formula [FeII(dmf)6][ReIVX6] [X = Cl (1) and Br (2); dmf = N,N-dimethylformamide] have been prepared and characterized. X-ray powder diffraction measurements on samples of 1 and 2 support the same structure for both systems. The crystal structure of 1 was determined by single-crystal X-ray diffraction. 1 crystallizes in the triclinic system with space group Pī. Each iron(II) is six-coordinate and bonded to six oxygens from six dmf molecules building a distorted octahedral environment. Rhenium(IV) is six-coordinate by six halide anions in an almost regular octahedral geometry. The magnetic properties were investigated from variable-temperature ma…

Structure of mammalian plasma fetuin-B and its mechanism of selective metallopeptidase inhibition

2018

The co-crystal structure of the metallopeptidase astacin with its specific protein inhibitor fetuin-B reveals a novel mechanism of inhibition.

The Late Miocene and Early Pliocene micromammal faunas from the Alcoy and Cabriel basins

2015

Objetivos El objetivo principal de este trabajo ha sido el muestreo y estudio de los niveles fosilíferos encontrados en el Barranco del Gormaget, en la Cuenca de Alcoy. Una vez estuvo clara la taxonomía de los abundantes restos de micromamíferos procedentes de estos yacimientos, intentamos alcanzar objetivos más específicos, tales como: - Datación relativa de las distintas localidades en virtud de su contenido faunístico. - Propuesta de una biozonación local para los yacimientos del Barranco del Gormaget. - Interpretación de la paleoecología de los yacimientos estudiados, basada en las proporciones relativas de los taxones encontrados en cada uno de ellos. Además, en esta tesis se presentan…

Los mamíferos del Mioceno Inferior de la Cuenca de Ribesalbes-Alcora (Castelló, España)

2017

Objetivos El propósito principal de esta tesis es el estudio taxonómico, paleoecológico y bioestratigráfico de los mamíferos fósiles del Neógeno continental de Araia d’Alcora, en la Cuenca de Ribesalbes-Alcora (Castelló, España), a partir de la prospección de diversas secciones y del muestreo de los yacimientos de mayor interés. Los principales objetivos planteados en esta tesis han sido: • La obtención de un registro lo más completo posible de las faunas de mamíferos del área de estudio, mediante la identificación de niveles fosilíferos y la toma de muestras suficientemente grandes para obtener colecciones de fósiles representativas. • Determinación taxonómica de los grupos de mamíferos ha…