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1.
Am J Hum Biol ; : e24163, 2024 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-39352106

RESUMO

BACKGROUND: Little is known about the cardiorespiratory fitness (CRF)-cardiometabolic risk relationship in Latin American pediatric populations across different age/sex groups, especially when considering the potential effects of adiposity on the association. We evaluated cross-sectional associations between VO2max and cardiometabolic risk variables (CMRV), and verified whether the associations were independent of adiposity markers in school-aged children and adolescents from Cali, Colombia. METHODS: The sample consisted of 1206 children aged 5-17 years. CMRV were fasting glucose, HDL and LDL cholesterol, triglycerides, systolic, and diastolic pressure. Logistic regressions were conducted for associations of age/sex-specific tertiles of VO2max with age/sex-specific highest tertiles of CMRV (except HDL-C, lowest tertile) and a CMR cluster (> 2 CMRV in extreme tertiles), adjusting for socioeconomic stratum, and adiposity markers (BMI, body fat percentage, and waist circumference). RESULTS: Overweight/obesity ranged from 15% to 18% with no difference by sex. In children aged 5-11 years, high VO2max (highest tertile vs. lowest) was inversely associated with the CMR cluster [Odds ratio (95% confidence interval): 0.18 (0.06-0.47), p < 0.05] independently of adjustment for any adiposity marker in boys but not in girls. In the age group of 12-17 years, there were initially significant VO2max- CMR cluster and VO2max- CMRV associations but attenuated by adiposity adjustment. In girls, high VO2max was inversely associated with high systolic blood pressure regardless of adjustment for adiposity markers. CONCLUSION: VO2max is inversely associated with cardiometabolic risk, but adiposity influences the association. The adiposity-independent association among younger boys requires further research. Interventions to tackle cardiometabolic risk in childhood may primarily focus on reducing excess adiposity, and secondarily on improvement of CRF.

2.
Syst Parasitol ; 101(6): 69, 2024 Oct 23.
Artigo em Inglês | MEDLINE | ID: mdl-39438315

RESUMO

Encotyllabe percussa n. sp. is proposed based on morphology and DNA sequences analysis of ribosomal (18S, 28S) and mitochondrial (COI) gene fragments. Encotyllabe percussa n. sp. was found infecting the spangled emperor Lethrinus nebulosus (n = 75) with higher prevalence from Dibba, Musandam (Gulf of Oman) than in Dhofar Salalah (Indian Ocean), Oman (p = 0.03). The general morphology of E. percussa n. sp. resembles E. caballeroi, E. chironemi and E. spari, which exhibit pre-equatorial testes. However, E. percussa n. sp. shows unique morphological characteristics distinguishing from congeneric species: the large hamuli bear notch allocated externally between the first half proximal of the root, and the small hamuli exhibit semicircular shape with undivided roots. Phylogenetic relationships within the Encotyllabe genus remain unresolved. However, the tree topology with the 28S showed overall consistency with the principal component analysis arrangement (PCA) derived from the morphological analysis. Which showed that the large and small hamuli, marginal hooks, ovary, testes (length and width) and peduncle are currently the most important morphological traits within the genus. Cytochrome c oxidase subunit I (COI) gene fragment showed high interspecific genetic divergence adding unambiguous resolution to discriminate/designate species identity. Interrelations within the genus support the identity of Encotyllabe percussa as a new species. This is the first species characterized with three gene fragments, the second congeneric species described in L. nebulosus and the first recorded in Oman.


Assuntos
Perciformes , Filogenia , Especificidade da Espécie , Animais , Perciformes/parasitologia , Trematódeos/classificação , Trematódeos/genética , Trematódeos/anatomia & histologia , RNA Ribossômico 28S/genética , Omã , Complexo IV da Cadeia de Transporte de Elétrons/genética , RNA Ribossômico 18S/genética
3.
Proc Natl Acad Sci U S A ; 121(43): e2410714121, 2024 Oct 22.
Artigo em Inglês | MEDLINE | ID: mdl-39413136

RESUMO

Flat bands and nontrivial topological physics are two important topics of condensed matter physics. With a unique stacking configuration analogous to the Su-Schrieffer-Heeger model, rhombohedral graphite (RG) is a potential candidate for realizing both flat bands and nontrivial topological physics. Here, we report experimental evidence of topological flat bands (TFBs) on the surface of bulk RG, which are topologically protected by bulk helical Dirac nodal lines via the bulk-boundary correspondence. Moreover, upon in situ electron doping, the surface TFBs show a splitting with exotic doping evolution, with an order-of-magnitude increase in the bandwidth of the lower split band, and pinning of the upper band near the Fermi level. These experimental observations together with Hartree-Fock calculations suggest that correlation effects are important in this system. Our results demonstrate RG as a platform for investigating the rich interplay between nontrivial band topology, correlation effects, and interaction-driven symmetry-broken states.

4.
Nat Aging ; 2024 Aug 29.
Artigo em Inglês | MEDLINE | ID: mdl-39210150

RESUMO

Inhibition of S6 kinase 1 (S6K1) extends lifespan and improves healthspan in mice, but the underlying mechanisms are unclear. Cellular senescence is a stable growth arrest accompanied by an inflammatory senescence-associated secretory phenotype (SASP). Cellular senescence and SASP-mediated chronic inflammation contribute to age-related pathology, but the specific role of S6K1 has not been determined. Here we show that S6K1 deletion does not reduce senescence but ameliorates inflammation in aged mouse livers. Using human and mouse models of senescence, we demonstrate that reduced inflammation is a liver-intrinsic effect associated with S6K deletion. Specifically, we show that S6K1 deletion results in reduced IRF3 activation; impaired production of cytokines, such as IL1ß; and reduced immune infiltration. Using either liver-specific or myeloid-specific S6K knockout mice, we also demonstrate that reduced immune infiltration and clearance of senescent cells is a hepatocyte-intrinsic phenomenon. Overall, deletion of S6K reduces inflammation in the liver, suggesting that suppression of the inflammatory SASP by loss of S6K could underlie the beneficial effects of inhibiting this pathway on healthspan and lifespan.

5.
Nano Lett ; 24(28): 8778-8783, 2024 Jul 17.
Artigo em Inglês | MEDLINE | ID: mdl-38976362

RESUMO

Coupling Weyl quasiparticles and charge density waves (CDWs) can lead to fascinating band renormalization and many-body effects beyond band folding and Peierls gaps. For the quasi-one-dimensional chiral compound (TaSe4)2I with an incommensurate CDW transition at TC = 263 K, photoemission mappings thus far are intriguing due to suppressed emission near the Fermi level. Models for this unconventional behavior include axion insulator phases, correlation pseudogaps, polaron subbands, bipolaron bound states, etc. Our photoemission measurements show sharp quasiparticle bands crossing the Fermi level at T > TC, but for T < TC, these bands retain their dispersions with no Peierls or axion gaps at the Weyl points. Instead, occupied band edges recede from the Fermi level, opening a spectral gap. Our results confirm localization of quasiparticles (holes created by photoemission) is the key physics, which suppresses spectral weights over an energy window governed by incommensurate modulation and inherent phase defects of CDW.

6.
Biomedica ; 44(Sp. 1): 63-72, 2024 05 31.
Artigo em Inglês, Espanhol | MEDLINE | ID: mdl-39079151

RESUMO

Introduction. Altered serum zinc levels, lower and higher than values in healthy controls, have been observed in individuals affected by non-communicable chronic diseases. However, to date, studies describing potential determinants of zinc levels in general populations free of chronic diseases appear to be limited. Objective. To evaluate whether nutrient intake, biochemical and clinical measures, lifestyle, and family history of cardio-metabolic diseases are independently associated with zinc levels in apparently healthy individuals. Materials and methods. We evaluated 239 healthy subjects. Serum zinc was measured via flame atomic absorption spectrometry, and the remaining biochemical markers were assessed using enzymatic colorimetric methods. Standard techniques were employed to quantify waist circumference, height, and weight. Body fat was measured via bioimpedance, and blood pressure was measured using digital sphygmomanometers. We applied a survey to record the personal and family history of non-communicable chronic diseases, and nutrient intake was estimated using the 24-hour recall method. Results. Women had lower serum zinc levels than men. In multivariate analyzes, total fat intake (ß = -0.15; standard error = 0.03; p < 0.001), plasma log-triglycerides (ß = -10.18; standard error = 3.9; p = 0.010), and female gender (ß = -6.81; standard error = 3.3; p = 0.043) were significant predictors for serum zinc levels. Zinc intake was not significantly related to serum zinc in univariate and multivariate analyses. Conclusions. Variables related to cardiometabolic risk, such as plasma triglyceride levels and total fat intake, were associated with serum zinc levels in individuals without a diagnosis of chronic or infectious/inflammatory diseases. Further studies are required to confirm our findings and to evaluate possible biological mechanisms for these relationships.


Introducción: Se han observado niveles séricos alterados de zinc, más altos o más bajos, en personas afectadas por enfermedades crónicas no transmisibles. Sin embargo, la información sobre determinantes de zinc sérico en poblaciones sin enfermedad crónica es muy limitada. OBJETIVO: Evaluar si la ingestión de nutrientes, las medidas bioquímicas y clínicas, el estilo de vida y los antecedentes familiares de las enfermedades cardiometabólicas están asociados de forma independiente con los niveles de zinc en individuos aparentemente sanos. Materiales y métodos. Se evaluaron 239 sujetos sanos. El zinc sérico se midió por espectrometría de absorción atómica de llama y el resto de los marcadores bioquímicos por métodos enzimáticos-colorimétricos. Se utilizaron técnicas estándar para medir la antropometría. Se aplicó una encuesta para registrar antecedentes personales y familiares, y se estimó el consumo de nutrientes por recordatorio de 24 horas. RESULTADOS: Las mujeres tenían niveles séricos de zinc más bajos que los hombres. En los análisis multivariados, la ingestión total de grasas (ß = -0,15; error estándar = 0,03; p <0,001), los triglicéridos plasmáticos (ß = -10,18; error estándar = 3,9; p = 0,010), y el sexo femenino (ß = -6,81; error estándar = 3.3; p = 0,043) fueron predictores significativos de los niveles séricos de zinc. La ingestión de zinc no estuvo significativamente relacionada con el zinc sérico en los análisis univariados y multivariados. CONCLUSIONES: Las variables relacionadas con el riesgo cardiometabólico como los niveles de triglicéridos y la ingestión total de grasas se asociaron con los niveles de zinc en individuos sin diagnóstico de enfermedades crónicas o infecciosas-inflamatorias. Se requieren más estudios para confirmar estos hallazgos, así como la evaluación de los posibles mecanismos biológicos de estas relaciones.


Assuntos
Zinco , Humanos , Zinco/sangue , Feminino , Masculino , Adulto , Pessoa de Meia-Idade , Fatores de Risco Cardiometabólico , Doenças Cardiovasculares/etiologia , Doenças Cardiovasculares/epidemiologia , Doenças Cardiovasculares/sangue , Fatores de Risco , Estudos Transversais , Triglicerídeos/sangue , Adulto Jovem
7.
Nat Commun ; 15(1): 3737, 2024 May 03.
Artigo em Inglês | MEDLINE | ID: mdl-38702313

RESUMO

Twisted bilayer graphene (tBLG) provides a fascinating platform for engineering flat bands and inducing correlated phenomena. By designing the stacking architecture of graphene layers, twisted multilayer graphene can exhibit different symmetries with rich tunability. For example, in twisted monolayer-bilayer graphene (tMBG) which breaks the C2z symmetry, transport measurements reveal an asymmetric phase diagram under an out-of-plane electric field, exhibiting correlated insulating state and ferromagnetic state respectively when reversing the field direction. Revealing how the electronic structure evolves with electric field is critical for providing a better understanding of such asymmetric field-tunable properties. Here we report the experimental observation of field-tunable dichotomic electronic structure of tMBG by nanospot angle-resolved photoemission spectroscopy (NanoARPES) with operando gating. Interestingly, selective enhancement of the relative spectral weight contributions from monolayer and bilayer graphene is observed when switching the polarity of the bias voltage. Combining experimental results with theoretical calculations, the origin of such field-tunable electronic structure, resembling either tBLG or twisted double-bilayer graphene (tDBG), is attributed to the selectively enhanced contribution from different stacking graphene layers with a strong electron-hole asymmetry. Our work provides electronic structure insights for understanding the rich field-tunable physics of tMBG.

8.
Cell Metab ; 36(6): 1371-1393.e7, 2024 Jun 04.
Artigo em Inglês | MEDLINE | ID: mdl-38718791

RESUMO

The role and molecular mechanisms of intermittent fasting (IF) in non-alcoholic steatohepatitis (NASH) and its transition to hepatocellular carcinoma (HCC) are unknown. Here, we identified that an IF 5:2 regimen prevents NASH development as well as ameliorates established NASH and fibrosis without affecting total calorie intake. Furthermore, the IF 5:2 regimen blunted NASH-HCC transition when applied therapeutically. The timing, length, and number of fasting cycles as well as the type of NASH diet were critical parameters determining the benefits of fasting. Combined proteome, transcriptome, and metabolome analyses identified that peroxisome-proliferator-activated receptor alpha (PPARα) and glucocorticoid-signaling-induced PCK1 act co-operatively as hepatic executors of the fasting response. In line with this, PPARα targets and PCK1 were reduced in human NASH. Notably, only fasting initiated during the active phase of mice robustly induced glucocorticoid signaling and free-fatty-acid-induced PPARα signaling. However, hepatocyte-specific glucocorticoid receptor deletion only partially abrogated the hepatic fasting response. In contrast, the combined knockdown of Ppara and Pck1 in vivo abolished the beneficial outcomes of fasting against inflammation and fibrosis. Moreover, overexpression of Pck1 alone or together with Ppara in vivo lowered hepatic triglycerides and steatosis. Our data support the notion that the IF 5:2 regimen is a promising intervention against NASH and subsequent liver cancer.


Assuntos
Carcinoma Hepatocelular , Jejum , Neoplasias Hepáticas , Camundongos Endogâmicos C57BL , Hepatopatia Gordurosa não Alcoólica , PPAR alfa , Fosfoenolpiruvato Carboxiquinase (GTP) , PPAR alfa/metabolismo , Animais , Carcinoma Hepatocelular/metabolismo , Carcinoma Hepatocelular/patologia , Hepatopatia Gordurosa não Alcoólica/metabolismo , Hepatopatia Gordurosa não Alcoólica/patologia , Humanos , Camundongos , Neoplasias Hepáticas/patologia , Neoplasias Hepáticas/metabolismo , Masculino , Fosfoenolpiruvato Carboxiquinase (GTP)/metabolismo , Peptídeos e Proteínas de Sinalização Intracelular/metabolismo , Fígado/metabolismo , Fígado/patologia , Cirrose Hepática/metabolismo , Cirrose Hepática/patologia , Transdução de Sinais , Jejum Intermitente
9.
Cir Cir ; 92(2): 141-149, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38782391

RESUMO

BACKGROUND: Clavicle fractures represent 2.5-4% of all fractures observed in emergency services. 80% occurs in the middle third. Treatment by plating requires a higher level of evidence. OBJECTIVE: To compare the functional outcomes of mid-shaft clavicle fractures managed with superior plating compared to anteroinferior plating. TRIAL DESIGN: A randomized, double-blind, parallel, superiority clinical trial. PATIENTS AND METHODS: Patients with fractures of the clavicles AO15B1 and AO15B2 were studied. Patients were randomized to be treated with either 3.5 mm superior or anteroinferior plating. A rehabilitation program was designed for both groups. The primary outcome measure was the Disability of Arm, Shoulder, and Hand (DASH) score; secondary outcomes included pain, union rate, and complication rates. RESULTS: Twenty-eight patients were studied and were eligible for analysis. Significant differences were found in the function assessed with the DASH score at 30 days for the superior plating compared with anteroinferior (43.74 vs. 29.26, respectively, p = 0.027), 60 days (23.97 vs. 11.18, p = 0.021), and 90 days (9.52 vs. 3.5, p = 0.016). One loosening with superficial infection was found with superior plating. CONCLUSIONS: Using an anteroinferior reconstruction plate in diaphyseal fractures offers better functional results than the upper plate in patients with fractures of the middle third of the clavicle.


ANTECEDENTES: Las fracturas de clavícula comprenden el 2.5-4% de todas las fracturas observadas en los servicios de emergencia. El 80% se presentan en el tercio medio. La posición de la placa como tratamiento requiere mayor nivel de evidencia. OBJETIVO: Comparar los resultados funcionales de las fracturas diafisarias de clavícula manejadas con placa superior versus placa anteroinferior. MÉTODO: Ensayo clínico aleatorizado, doble ciego, paralelo, de superioridad. Se estudiaron pacientes con fractura diafisaria de clavícula AO15B1 y AO15B2. Se manejaron con placa de reconstrucción de 3.5 mm colocada en forma superior o anteroinferior. Se diseñó un programa de rehabilitación para ambos grupos. El resultado primario fue medido con el cuestionario DASH y los resultados secundarios incluyeron dolor, presencia de consolidación y complicaciones. RESULTADOS: Fueron elegibles para análisis 28 pacientes. Se encontraron diferencias significativas de la escala DASH a los 30 días para la maniobra superior comparada con la inferior (43.74 vs. 29.26, respectivamente; p = 0.027), a los 60 días (23.97 vs. 11.18; p = 0.021) y a los 90 días (9.52 vs. 3.5; p = 0.016). CONCLUSIONES: El uso de placa de reconstrucción anteroinferior en las fracturas diafisarias ofrece mejores resultados funcionales en comparación con la placa superior en pacientes con fracturas de tercio medio de clavícula.


Assuntos
Placas Ósseas , Clavícula , Fixação Interna de Fraturas , Fraturas Ósseas , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem , Clavícula/lesões , Clavícula/cirurgia , Método Duplo-Cego , Fixação Interna de Fraturas/métodos , Fixação Interna de Fraturas/instrumentação , Fraturas Ósseas/cirurgia , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/epidemiologia , Resultado do Tratamento
10.
Fam Cancer ; 23(3): 233-246, 2024 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-38780705

RESUMO

Pancreatic ductal adenocarcinoma (PDAC) is the fourth leading cause of cancer-related death in the Western world. The number of diagnosed cases and the mortality rate are almost equal as the majority of patients present with advanced disease at diagnosis. Between 4 and 10% of pancreatic cancer cases have an apparent hereditary background, known as hereditary pancreatic cancer (HPC) and familial pancreatic cancer (FPC), when the genetic basis is unknown. Surveillance of high-risk individuals (HRI) from these families by imaging aims to detect PDAC at an early stage to improve prognosis. However, the genetic basis is unknown in the majority of HRIs, with only around 10-13% of families carrying known pathogenic germline mutations. The aim of this study was to assess an individual's genetic cancer risk based on sex and personal and family history of cancer. The Best Linear Unbiased Prediction (BLUP) methodology was used to estimate an individual's predicted risk of developing cancer during their lifetime. The model uses different demographic factors in order to estimate heritability. A reliable estimation of heritability for pancreatic cancer of 0.27 on the liability scale, and 0.07 at the observed data scale as obtained, which is different from zero, indicating a polygenic inheritance pattern of PDAC. BLUP was able to correctly discriminate PDAC cases from healthy individuals and those with other cancer types. Thus, providing an additional tool to assess PDAC risk HRI with an assumed genetic predisposition in the absence of known pathogenic germline mutations.


Assuntos
Carcinoma Ductal Pancreático , Predisposição Genética para Doença , Mutação em Linhagem Germinativa , Neoplasias Pancreáticas , Humanos , Carcinoma Ductal Pancreático/genética , Neoplasias Pancreáticas/genética , Feminino , Masculino , Pessoa de Meia-Idade , Adulto , Idoso , Medição de Risco/métodos , Carcinoma
11.
Biomédica (Bogotá) ; Biomédica (Bogotá);44(supl.1): 63-72, mayo 2024. tab
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1574115

RESUMO

Abstract Introduction. Altered serum zinc levels, lower and higher than values in healthy controls, have been observed in individuals affected by non-communicable chronic diseases. However, to date, studies describing potential determinants of zinc levels in general populations free of chronic diseases appear to be limited. Objective. To evaluate whether nutrient intake, biochemical and clinical measures, lifestyle, and family history of cardio-metabolic diseases are independently associated with zinc levels in apparently healthy individuals. Materials and methods. We evaluated 239 healthy subjects. Serum zinc was measured via flame atomic absorption spectrometry, and the remaining biochemical markers were assessed using enzymatic colorimetric methods. Standard techniques were employed to quantify waist circumference, height, and weight. Body fat was measured via bioimpedance, and blood pressure was measured using digital sphygmomanometers. We applied a survey to record the personal and family history of non-communicable chronic diseases, and nutrient intake was estimated using the 24-hour recall method. Results. Women had lower serum zinc levels than men. In multivariate analyzes, total fat intake (β = -0.15; standard error = 0.03; p < 0.001), plasma log-triglycerides (β = -10.18; standard error = 3.9; p = 0.010), and female gender (β = -6.81; standard error = 3.3; p = 0.043) were significant predictors for serum zinc levels. Zinc intake was not significantly related to serum zinc in univariate and multivariate analyses. Conclusions. Variables related to cardiometabolic risk, such as plasma triglyceride levels and total fat intake, were associated with serum zinc levels in individuals without a diagnosis of chronic or infectious/inflammatory diseases. Further studies are required to confirm our findings and to evaluate possible biological mechanisms for these relationships.


Resumen Introducción. Se han observado niveles séricos alterados de zinc, más altos o más bajos, en personas afectadas por enfermedades crónicas no transmisibles. Sin embargo, la información sobre determinantes de zinc sérico en poblaciones sin enfermedad crónica es muy limitada. Objetivo. Evaluar si la ingestión de nutrientes, las medidas bioquímicas y clínicas, el estilo de vida y los antecedentes familiares de las enfermedades cardiometabólicas están asociados de forma independiente con los niveles de zinc en individuos aparentemente sanos. Materiales y métodos. Se evaluaron 239 sujetos sanos. El zinc sérico se midió por espectrometría de absorción atómica de llama y el resto de los marcadores bioquímicos por métodos enzimáticos-colorimétricos. Se utilizaron técnicas estándar para medir la antropometría. Se aplicó una encuesta para registrar antecedentes personales y familiares, y se estimó el consumo de nutrientes por recordatorio de 24 horas. Resultados. Las mujeres tenían niveles séricos de zinc más bajos que los hombres. En los análisis multivariados, la ingestión total de grasas (β = -0,15; error estándar = 0,03; p < 0,001), los triglicéridos plasmáticos (β = -10,18; error estándar = 3,9; p = 0,010), y el sexo femenino (β = -6,81; error estándar = 3.3; p = 0,043) fueron predictores significativos de los niveles séricos de zinc. La ingestión de zinc no estuvo significativamente relacionada con el zinc sérico en los análisis univariados y multivariados. Conclusiones. Las variables relacionadas con el riesgo cardiometabólico como los niveles de triglicéridos y la ingestión total de grasas se asociaron con los niveles de zinc en individuos sin diagnóstico de enfermedades crónicas o infecciosas-inflamatorias. Se requieren más estudios para confirmar estos hallazgos, así como la evaluación de los posibles mecanismos biológicos de estas relaciones.

12.
Nat Mater ; 23(8): 1070-1076, 2024 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-38658674

RESUMO

Magic-angle twisted bilayer graphene exhibits correlated phenomena such as superconductivity and Mott insulating states related to the weakly dispersing flat band near the Fermi energy. Such a flat band is expected to be sensitive to both the moiré period and lattice relaxations. Thus, clarifying the evolution of the electronic structure with the twist angle is critical for understanding the physics of magic-angle twisted bilayer graphene. Here we combine nano-spot angle-resolved photoemission spectroscopy and atomic force microscopy to resolve the fine electronic structure of the flat band and remote bands, as well as their evolution with twist angle from 1.07° to 2.60°. Near the magic angle, the dispersion is characterized by a flat band near the Fermi energy with a strongly reduced band width. Moreover, we observe a spectral weight transfer between remote bands at higher binding energy, which allows to extract the modulated interlayer spacing near the magic angle. Our work provides direct spectroscopic information on flat band physics and highlights the important role of lattice relaxations.

13.
World J Radiol ; 16(3): 58-68, 2024 Mar 28.
Artigo em Inglês | MEDLINE | ID: mdl-38596169

RESUMO

BACKGROUND: Fibroadenoma (FA) is the most common tumor found in young women, although it can occur in any age group. Ductal carcinoma in situ (DCIS) that is confined in a FA is rare; it is most frequently reported as an incidental finding. CASE SUMMARY: We report a case of DCIS within a FA in a 46-year-old female without cancer-related personal and family histories. The patient was diagnosed with a breast conglomerate of nodules and was followed for 1 year. In the current control image study, we found suspicious microcalcification, as a new finding, within one of the nodules. Consequently, a core biopsy of the tumor, which appeared hypoechoic, oval, and circumscribed, was performed. The pathological diagnosis was ductal carcinoma in situ within a fibroepithelial lesion. The patient underwent breast-conserving surgery and received radiotherapy as well as endocrine therapy (tamoxifen). CONCLUSION: We recommend a multidisciplinary approach for adequate treatment and follow-up.

14.
Nanomaterials (Basel) ; 14(8)2024 Apr 21.
Artigo em Inglês | MEDLINE | ID: mdl-38668221

RESUMO

Sputtering of silicon in a He magnetron discharge (MS) has been reported as a bottom-up procedure to obtain He-charged silicon films (i.e., He nanobubbles encapsulated in a silicon matrix). The incorporation of heavier noble gases is demonstrated in this work with a synergistic effect, producing increased Ne and Ar incorporations when using He-Ne and He-Ar gas mixtures in the MS process. Microstructural and chemical characterizations are reported using ion beam analysis (IBA) and scanning and transmission electron microscopies (SEM and TEM). In addition to gas incorporation, He promotes the formation of larger nanobubbles. In the case of Ne, high-resolution X-ray photoelectron and absorption spectroscopies (XPS and XAS) are reported, with remarkable dependence of the Ne 1s photoemission and the Ne K-edge absorption on the nanobubble's size and composition. The gas (He, Ne and Ar)-charged thin films are proposed as "solid" targets for the characterization of spectroscopic properties of noble gases in a confined state without the need for cryogenics or high-pressure anvils devices. Also, their use as targets for nuclear reaction studies is foreseen.

15.
Animals (Basel) ; 14(5)2024 Mar 05.
Artigo em Inglês | MEDLINE | ID: mdl-38473191

RESUMO

N-alkanes offer a promising approach for assessing the nutritional contribution of external sources to the diets of laying hens in free-range production systems. However, traditional laboratory methods, involving extraction, purification and gas chromatographic analysis, are both economically burdensome and time-consuming. Near-infrared spectroscopy (NIRS) is emerging as a viable alternative, with varying degrees of accuracy depending on the chemical nature and concentration of the component of interest. In our research, we focus on the accuracy of NIRS in predicting the concentrations of n-alkanes (C25-C33) in excreta under simulated free-range conditions with two different diets: one containing a commercial feed with minimal n-alkane content and another containing 1% alfalfa on top of the commercial feed. Spectra processing and calibration were tailored for each n-alkane, with NIRS performance influenced by diet type. Notably, plant predictions using NIR-generated data were consistent with laboratory results, despite a slight tendency toward overestimation (3.40% using the NIRS-generated C25-C29-C33 combination versus 2.80% using laboratory analysis). This indicates the potential of NIRS as an efficient tool to assess n-alkanes in excreta of laying hens and, consequently, the nutritional contribution of the free-range environment, providing rapid and cost-effective results.

16.
Nat Commun ; 15(1): 1041, 2024 Feb 03.
Artigo em Inglês | MEDLINE | ID: mdl-38310113

RESUMO

Cellular senescence is a stress response with broad pathophysiological implications. Senotherapies can induce senescence to treat cancer or eliminate senescent cells to ameliorate ageing and age-related pathologies. However, the success of senotherapies is limited by the lack of reliable ways to identify senescence. Here, we use nuclear morphology features of senescent cells to devise machine-learning classifiers that accurately predict senescence induced by diverse stressors in different cell types and tissues. As a proof-of-principle, we use these senescence classifiers to characterise senolytics and to screen for drugs that selectively induce senescence in cancer cells but not normal cells. Moreover, a tissue senescence score served to assess the efficacy of senolytic drugs and identified senescence in mouse models of liver cancer initiation, ageing, and fibrosis, and in patients with fatty liver disease. Thus, senescence classifiers can help to detect pathophysiological senescence and to discover and validate potential senotherapies.


Assuntos
Envelhecimento , Senescência Celular , Animais , Camundongos , Humanos , Envelhecimento/fisiologia , Senescência Celular/fisiologia , Fibrose
17.
Heliyon ; 10(4): e26610, 2024 Feb 29.
Artigo em Inglês | MEDLINE | ID: mdl-38420392

RESUMO

The European electricity market is becoming increasingly interconnected, raising questions about how intrazonal congestion management, typically governed by national regulations, interacts with the coupled cross-zonal markets. A major concern is the lack of information regarding intrazonal congestion management methods. This paper addresses this issue by examining different ways in which European transmission system operators (TSOs) use third-party resources to manage congestion in short-term electricity markets. We create a decision-tree-based classification to represent all identified congestion management methods and select three cases for comprehensive evaluation using predefined assessment criteria. While doing so, we identify a trade-off between efficiency and ease of implementation. The balance between these two factors is determined by the severity of the congestion. In a severely congested grid, locational signals are critical, requiring a better alignment between the network representation in the market clearing and the physical network constraints. When the congestion is less severe, TSOs can choose other congestion management methods based on factors such as the predictability of congestion and resource availability. These findings shed light on the complexities of congestion management in an integrated European market and can inform future policy decisions.

18.
Animals (Basel) ; 14(3)2024 Jan 24.
Artigo em Inglês | MEDLINE | ID: mdl-38338021

RESUMO

The shift in animal welfare standards towards free-range housing for laying hens in the EU has raised questions about changes in dietary composition. Accurate assessment of outdoor plant material intake is crucial for effective feeding strategies. This study introduces an approach using n-alkanes as markers to determine plant intake in laying hens, involving n-alkane recovery rate assessment, discriminant analysis and linear equation-solving for both qualitative and quantitative assessment, respectively, considering systematic n-alkane combinations. Two diets: a standard commercial diet and a diet incorporating 1% alfalfa were tested. Chemical analyses showed an altered n-alkane profile due to alfalfa inclusion, resulting a recovery rates ranging from 30-44% depending on the n-alkane type and diet. Statistical analysis revealed significant differences in recovery rates among the different alkanes for the same diets and between the diets for the same alkane, together with an interaction between n-alkane carbon chain length and initial concentration in the diet. The method accurately predicted plant inclusion, with a slight overestimation (2.80%) using the combination C25-C29-C33. Accurate qualitative classification of the animals based on fecal n-alkanes profiles was observed. The study successfully demonstrated the utility of n-alkanes for estimating dietary composition, providing a non-invasive approach for future free-range studies.

19.
Radiol Case Rep ; 19(4): 1313-1318, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38292778

RESUMO

Lymphoma is the most frequent hematologic malignancy that involves the breast. It represents less than 1% of all breast cancer. The most common subtype is the secondary B-cell lymphoma. Clinically, lymphomas are divided into primary and secondary breast lymphoma. We presented a case of 49-year-old female, who has diagnosed of Non-Hodgkin's Lymphoma, finalizing the treatment 2 months ago. Currently, she came for a check-up due to a palpable lump in the right breast. Mammography shows a dense, oval, and circumscribed mass. Ultrasound revealed a 3.6 cm oval, hypoechoic, lobulated mass with internal vascularity at color Doppler. Axillary nodes show cortical thickening of 7 mm, cortical blood flood, and absence of fatty hilum. The histopathology report corresponds to infiltration of the right breast and bilateral axillary nodes by Non-Hodgkin Lymphoma. This case corresponds with lymphoma recurrence manifested in breast. The diagnosis of lymphoma is an imaging challenge that simulates benign and malignant pathologies.

20.
Int J Occup Med Environ Health ; 37(1): 128-137, 2024 Mar 05.
Artigo em Inglês | MEDLINE | ID: mdl-38264916

RESUMO

OBJECTIVES: This study aimed to evaluate cytogenetic damage in the buccal mucosa of non-exposed subjects (N = 33) and insecticide-exposed fumigators (N = 31) in the urban area of Cali, Colombia. MATERIAL AND METHODS: Through a questionnaire sociodemographic data, anthropometric measurements, state of health, and lifestyle were collected. Buccal micronucleus cytome (BMCyt) assay was using for evaluate cytogenetic damage. RESULTS: The study showed that all fumigators used adequate personal protective equipment (PPE) and had low alcohol consumption. The authors did not find significant differences in BMCyt biomarkers between the groups (p > 0.05). Multivariate analysis showed a 13% increase in micronucleus (MN) frequency for every year of increasing age (OR = 1.13, p = 0.029), and higher MN with the decrease in daily fruit consumption (OR = 4.71, p = 0.084), without statistical significance. CONCLUSIONS: The results between groups could be related to healthy habits and PPE use among the subjects. Int J Occup Med Environ Health. 2024;37(1):128-37.


Assuntos
Inseticidas , Exposição Ocupacional , Humanos , Exposição Ocupacional/efeitos adversos , Exposição Ocupacional/análise , Mucosa Bucal/química , Colômbia , Testes para Micronúcleos/métodos , Dano ao DNA
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