Publications by authors named "Marina Perez"

Purpose: The aim of this study was to compare the diagnostic performance of the Gynecology Imaging Reporting and Data System (GI-RADS) and Ovarian-Adnexal Reporting and Data System (O-RADS) ultrasound (US) classification systems and assess their capacity to stratify the risk of malignancy in adnexal masses (AMs).

Methods: A comprehensive search of MEDLINE (PubMed), Scopus, Web of Science, and Google Scholar was conducted to identify articles published between January 2020 and August 2023. The quality of the studies, the risk of bias, and concerns regarding applicability were assessed using QUADAS-2.

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The intestinal microbiota can regulate numerous host functions, including the immune response. Through fermentation, the microbiota produces and releases microbial metabolites such as short-chain fatty acids (SCFAs), which can affect host homeostasis. There is growing evidence that the gut microbiome can have a major impact on cancer.

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Objectives: To explore the patient journey of people with fibromyalgia (FM) in Latin American countries in order to identify problems in health care and other areas that may be resolvable.

Methods: Qualitative study with phenomenological and content analysis approach through focus groups and patient journey (Ux; User Experience) methodology. Nine virtual focus groups were conducted with FM patients and healthcare professionals in Argentina, Mexico and Colombia recruited from key informants and social networks.

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Since May 2022, monkeypox cases have been reported in non-endemic countries with different characteristics from the traditional description of the disease, predominantly in men who have sex with men, with possible sexual transmission and with no documentation of mortality to date. We report what would be the first patient diagnosed in Argentina with no travel nexus to countries with viral circulation. Young, bisexual man, on antiretroviral HIV pre-exposure prophylaxis, whose presentation was exudative pharyngitis with no other documented aetiology and lymphadenopathy that progressed to necrosis, presence of characteristic asynchronous lesions on the face, neck, abdomen, extremities, and genitals, in a total of no more than 25.

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In superconducting quantum circuits, aluminum is one of the most widely used materials. It is currently also the superconductor of choice for the development of topological qubits. However, aluminum-based devices suffer from poor magnetic field compatibility.

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Background: Warm ischemia time and ischemia-reperfusion damage result in higher rates of delayed graft function and primary nonfunction in kidney transplants (KTs) from controlled donation after circulatory death (cDCD). This study aimed to assess early and late kidney function and patient and graft survival of KT from cDCD preserved with normothermic regional perfusion (NRP) and to compare with KT from brain death donors (DBDs) and cDCD preserved with rapid recovery (RR).

Methods: Patients who received a KT at our institution from 2012 to 2018 were included, with a minimum follow-up period of 1 y.

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Women who are obese have lower rates of breastfeeding initiation and duration and are less likely to breastfeed exclusively compared with women who are not obese. To develop programs to improve breastfeeding practices among this group of women, we investigated the association between maternal obesity and breastfeeding practices and problems in the first days postpartum. We analyzed medical records from postpartum women at a rooming-in maternity ward in State of São Paulo, Brazil, between 2016 and 2018.

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Article Synopsis
  • A study in six London care homes with COVID-19 outbreaks examined the rates of SARS-CoV-2 infection among residents and staff, with a follow-up five weeks later to assess antibody levels.
  • In the initial investigation, 77.2% of surviving residents and 81.9% of staff participated in serological testing, revealing that nearly all previously infected individuals developed antibodies, regardless of symptom status.
  • The findings suggest that RT-PCR testing alone underrepresents actual exposure rates during outbreaks, highlighting that most participants had neutralizing antibodies regardless of their age or symptoms.
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Article Synopsis
  • Care homes in London experienced significant COVID-19 outbreaks in April 2020, with 39.8% of residents testing positive for SARS CoV-2, and a notable difference in case-fatality rates among symptomatic versus asymptomatic individuals.
  • 105 out of 264 residents and 53 out of 254 staff tested positive, with many being asymptomatic, indicating that symptom-based screening may not be enough to control outbreaks.
  • Whole genome sequencing revealed multiple introductions of different SARS-CoV-2 strains in individual care homes, emphasizing the complexity of infection control in these settings.
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Article Synopsis
  • Care homes faced significant challenges during the COVID-19 pandemic, with ongoing outbreaks even as community infection rates fell, highlighting their role in virus transmission.
  • An assessment of infection risks among staff in six London care homes found 21% tested positive for SARS-CoV-2, mostly without symptoms, with higher positivity rates in staff who worked across multiple homes compared to those in a single home.
  • Whole genome sequencing revealed local infection clusters among staff, emphasizing the need for stringent infection control measures that include all interactions, not just those with residents.
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Background: Luciferases, enzymes that catalyze bioluminescent reactions in different organisms, have been extensively used for bioanalytical purposes. The most well studied bioluminescent system is that of firefly and other beetles, which depends on a luciferase, a benzothiazolic luciferin and ATP, and it is being widely used as a bioanalytical reagent to quantify ATP. Protein kinases are proteins that modify other proteins by transferring phosphate groups from a nucleoside triphosphate, usually ATP.

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Underwater Wireless Sensor Networks (UWSNs) using electromagnetic (EM) technology in marine shallow waters are examined, not just for environmental monitoring but for further interesting applications. Particularly, the use of EM waves is reconsidered in shallow waters due to the benefits offered in this context, where acoustic and optical technologies have serious disadvantages. Sea water scenario is a harsh environment for radiocommunications, and there is no standard model for the underwater EM channel.

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In the first part of the paper, we modeled and characterized the underwater radio channel in shallowwaters. In the second part,we analyze the application requirements for an underwaterwireless sensor network (U-WSN) operating in the same environment and perform detailed simulations. We consider two localization applications, namely self-localization and navigation aid, and propose algorithms that work well under the specific constraints associated with U-WSN, namely low connectivity, low data rates and high packet loss probability.

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The discovery of gut hormones regulating the energy balance has aroused great interest in the scientific community. Some of these hormones modulate appetite and satiety, acting on the hypothalamus or the solitary tract nucleus in the brainstem. In general, the endocrine signals generated in the gut have direct or indirect (through the autonomous nervous system) anorexigenic effects.

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