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1.
Support Care Cancer ; 32(5): 290, 2024 Apr 16.
Artículo en Inglés | MEDLINE | ID: mdl-38627334

RESUMEN

PURPOSE: Although lomustine has been used as a chemotherapeutic agent for decades, no recommendation on appropriate chemotherapy-induced nausea and vomiting (CINV) prophylaxis is available. As CINV is considered one of the most bothersome side effects of chemotherapy, adequate prophylaxis is of relevance to improve quality of life during cancer treatment. The aim of this retrospective case series was to report the incidence and severity of CINV in pediatric patients with high-grade glioma treated with lomustine and to formulate recommendations for appropriate CINV prophylaxis. METHODS: Pediatric patients treated with lomustine for high-grade glioma according to the ACNS 0423 protocol were identified retrospectively. Two researchers independently reviewed and classified complaints of CINV and administered CINV prophylaxis. Treatment details, tumor localization, and response to therapy were systematically extracted from the patients' files. RESULTS: Seventeen children aged 8-18 years received a median of four cycles of lomustine. CINV complaints and administered prophylaxis were evaluable in all patients. Moderate or severe CINV was observed in 13/17 (76%) patients. Administered prophylactic CINV regimens varied from no prophylaxis to triple-agent combinations. CONCLUSION: In this case series, we identified lomustine as a highly emetogenic chemotherapeutic agent. According to the current guidelines, CINV prophylaxis with a 5-HT3 receptor antagonist in combination with dexamethasone and (fos)aprepitant is recommended.


Asunto(s)
Antieméticos , Antineoplásicos , Glioma , Humanos , Niño , Estudios Retrospectivos , Lomustina/efectos adversos , Calidad de Vida , Antineoplásicos/efectos adversos , Náusea/inducido químicamente , Náusea/prevención & control , Náusea/tratamiento farmacológico , Vómitos/inducido químicamente , Vómitos/tratamiento farmacológico , Vómitos/prevención & control , Glioma/tratamiento farmacológico
2.
Environ Res ; 246: 118061, 2024 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-38157967

RESUMEN

This research was performed to investigate the bactericidal and fungicidal competence of extracts (methanol and petroleum ether extract) of Polyalthia longifolia leaf. Moreover, the major active compounds present in the effective crude extract (either methanol or petroleum ether extract) was determined through initially with UV-Vis spectra, FTIR, and GC-MS analyses. The methanol extract alone showed remarkable bactericidal and fungicidal activity against the bacterial (S. pyogenes > E. coli > S. aureus > S. pneumoniae > C. difficile > P. aeruginosa) and fungal (A. clavatus > C. albicans > A. niger > A. fumigatus > C. tropicalis > C. auris) pathogens at increased concentration (12.5 mg mL-1) than petroleum ether extract. The MIC and MBC values of methanol extract were found as 10-20 mg mL-1 and 30-40 mg mL-1 respectively. The MFC value of methanol extract was found as 10-20 mg mL-1. These MIC, MBC, and MFC values of methanol extract were considerably greater than petroleum ether extract. The FTIR and GC-MS characterization studies revealed that the presence of more acre functional groups belonging to bioactive compounds such as Z)-7-Hexadecenal, Aromandendrene, α-Curcumene, Caryophyllene, Methyl 14-methyl Pentadecanoat, Methyl trans-13-Octadecenoate, 9-Octadecenoic acid (Z)-, and 2-hydroxy-1- (hydroxymethyl)ethyl. As a result of these findings, it is possible that P. longifolia leaf methanol extract contains medicinally important bioactive substances with bactericidal and fungicidal properties.


Asunto(s)
Alcanos , Antiinfecciosos , Clostridioides difficile , Fungicidas Industriales , Polyalthia , Extractos Vegetales/farmacología , Metanol , Escherichia coli , Staphylococcus aureus , Antiinfecciosos/farmacología , Antibacterianos/farmacología , Solventes , Candida albicans
3.
Ann Oncol ; 34(11): 1035-1046, 2023 11.
Artículo en Inglés | MEDLINE | ID: mdl-37619847

RESUMEN

BACKGROUND: Human epidermal growth factor receptor 2 (HER2)-low is a newly defined category with HER2 1+ or 2+ expression by immunohistochemistry (IHC) and lack of HER2 gene amplification measured by in situ hybridization (ISH). Much remains unknown about the HER2-low status across tumor types and changes in HER2 status between primary and metastatic samples. PATIENTS AND METHODS: HER2 expression by IHC was evaluated in 4701 patients with solid tumors. We have evaluated the HER2 expression by IHC and amplification by ISH in paired breast and gastric/gastroesophageal (GEJ) primary and metastatic samples. HER2 expression was correlated with ERBB2 genomic alterations evaluated by next-generation sequencing (NGS) in non-breast, non-gastric/GEJ samples. RESULTS: HER2 expression (HER2 IHC 1-3+) was found in half (49.8%) of the cancers, with HER2-low (1 or 2+) found in many tumor types: 47.1% in breast, 34.6% in gastric/GEJ, 50.0% in salivary gland, 46.9% in lung, 46.5% in endometrial, 46% in urothelial, and 45.5% of gallbladder cancers. The concordance evaluation of HER2 expression between primary and metastatic breast cancer samples showed that HER2 3+ remained unchanged in 87.1% with a strong agreement between primary and metastatic samples, with a weighted kappa (Κ) of 0.85 (95% confidence interval 0.79-0.91). ERBB2 alterations were identified in 117 (7.5%) patients with non-breast, non-gastric/GEJ solid tumors who had NGS testing. Of 1436 patients without ERBB2 alterations, 512 (35.7%) showed any level HER2 expression by IHC. CONCLUSION: Our results show that HER2-low expression is frequently found across tumor types. These findings suggest that many patients with HER2-low solid tumors might benefit from HER2-targeted therapies.


Asunto(s)
Neoplasias de la Mama , Neoplasias Primarias Secundarias , Humanos , Femenino , Receptor ErbB-2/genética , Receptor ErbB-2/metabolismo , Neoplasias de la Mama/genética , Neoplasias de la Mama/patología , Hibridación in Situ , Inmunohistoquímica , Genómica/métodos , Biomarcadores de Tumor/genética , Biomarcadores de Tumor/metabolismo
4.
Environ Res ; 239(Pt 2): 117370, 2023 Dec 15.
Artículo en Inglés | MEDLINE | ID: mdl-37827374

RESUMEN

The current research investigates the utilization of spirulina microalgae biodiesel blends in a naturally aspirated constant speed compression ignition engine with Ce2O3 nanoparticles at the concentration of 50 ppm under diverse engine loading conditions. Blends of microalgae dispersed with neat diesel at the volume of 20% and 40%. A series of tests were conducted to evaluate the combined effects of microalgae and nanoparticles on engine performance, combustion efficiency, and emission characteristics. The study revealed that increasing the microalgae concentration in the diesel fuel resulted in reduced brake thermal efficiency due to less effective atomization and lower calorific value. Surprisingly, the 20% biodiesel blend with nanoparticles exhibited the highest brake thermal efficiency across various engine loads, while the 40% blend showed higher brake specific fuel consumption compared to both the 20% blend and neat diesel, primarily because of its lower heating value necessitating increased fuel consumption. Furthermore, the biodiesel blends led to lower in-cylinder pressure than pure diesel, mainly attributable to suboptimal atomization. In terms of emissions, the utilization of microalgae-based fuel led to a significant reduction in NOx, CO, and smoke emissions, attributed to the lower cylinder temperatures associated with these blends. In conclusion, this study underscores the potential of spirulina microalgae, particularly when combined with nanoparticles at an optimal concentration, as a promising and environmentally friendly alternative for compression ignition engines.


Asunto(s)
Microalgas , Nanopartículas , Spirulina , Biocombustibles , Emisiones de Vehículos , Gasolina , Monóxido de Carbono/análisis
5.
BMC Geriatr ; 22(1): 36, 2022 01 10.
Artículo en Inglés | MEDLINE | ID: mdl-35012478

RESUMEN

BACKGROUND: Due to ageing of the population the incidence of multimorbidity and polypharmacy is rising. Polypharmacy is a risk factor for medication-related (re)admission and therefore places a significant burden on the healthcare system. The reported incidence of medication-related (re)admissions varies widely due to the lack of a clear definition. Some medications are known to increase the risk for medication-related admission and are therefore published in the triggerlist of the Dutch guideline for Polypharmacy in older patients. Different interventions to support medication optimization have been studied to reduce medication-related (re)admissions. However, the optimal template of medication optimization is still unknown, which contributes to the large heterogeneity of their effect on hospital readmissions. Therefore, we implemented a clinical decision support system (CDSS) to optimize medication lists and investigate whether continuous use of a CDSS reduces the number of hospital readmissions in older patients, who previously have had an unplanned probably medication-related hospitalization. METHODS: The CHECkUP study is a multicentre randomized study in older (≥60 years) patients with an unplanned hospitalization, polypharmacy (≥5 medications) and using at least two medications from the triggerlist, from Zuyderland Medical Centre and Maastricht University Medical Centre+ in the Netherlands. Patients will be randomized. The intervention consists of continuous (weekly) use of a CDSS, which generates a Medication Optimization Profile, which will be sent to the patient's general practitioner and pharmacist. The control group will receive standard care. The primary outcome is hospital readmission within 1 year after study inclusion. Secondary outcomes are one-year mortality, number of emergency department visits, nursing home admissions, time to hospital readmissions and we will evaluate the quality of life and socio-economic status. DISCUSSION: This study is expected to add evidence on the knowledge of medication optimization and whether use of a continuous CDSS ameliorates the risk of adverse outcomes in older patients, already at an increased risk of medication-related (re)admission. To our knowledge, this is the first large study, providing one-year follow-up data and reporting not only on quality of care indicators, but also on quality-of-life. TRIAL REGISTRATION: The trial was registered in the Netherlands Trial Register on October 14, 2018, identifier: NL7449 (NTR7691). https://www.trialregister.nl/trial/7449 .


Asunto(s)
Hospitalización , Calidad de Vida , Anciano , Hospitales , Humanos , Multimorbilidad , Polifarmacia
6.
Acta Paediatr ; 111(3): 667-674, 2022 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-34773285

RESUMEN

AIM: To evaluate the prevalence of potentially hepatoxic paracetamol ingestion and associated N-acetylcysteine treatment in young children suspected of paracetamol poisoning. METHODS: A retrospective cohort study of children aged 0-6 years suspected of paracetamol poisoning with a related plasma-paracetamol measurement in the Capital Region of Denmark in the period 2010-2017. Data from the clinical laboratory system were linked to data from electronic patient records via the unique identification number given to all Danish residents. RESULTS: Of 297 children included, suspected single paracetamol overdoses were present in 281 (95%). Sixty-nine per cent were treated with N-acetylcysteine, and the mean treatment period was 20.3 h (SD 20.8). A maximum of 6 (2%) of the children suspected of single overdose had plasma-paracetamol concentrations that exceeded the recommended treatment thresholds. No cases of severe hepatotoxicity were registered. Adverse events to N-acetylcysteine-treatment were registered in 3 (2%) children including one anaphylactoid reaction (0.5%). CONCLUSION: This study shows that initiating N-acetylcysteine as a 'one size fit all' treatment regimen in all children aged 0-6 years with a suspected single paracetamol overdose leads to substantial overtreatment. The data support that it is feasible to initiate N-acetylcysteine within 10 h based on an early plasma-paracetamol test.


Asunto(s)
Acetaminofén , Analgésicos no Narcóticos , Acetilcisteína/uso terapéutico , Antídotos/uso terapéutico , Niño , Preescolar , Dinamarca/epidemiología , Humanos , Lactante , Recién Nacido , Estudios Retrospectivos
7.
Int J Forecast ; 38(3): 1129-1157, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35035005

RESUMEN

We develop a variant of intervention analysis designed to measure a change in the law of motion for the distribution of individuals in a cross-section, rather than modeling the moments of the distribution. To calculate a counterfactual forecast, we discretize the distribution and employ a Markov model in which the transition probabilities are modeled as a multinomial logit distribution. Our approach is scalable and is designed to be applied to micro-level data. A wide panel often carries with it several imperfections that complicate the analysis when using traditional time-series methods; our framework accommodates these imperfections. The result is a framework rich enough to detect intervention effects that not only shift the mean, but also those that shift higher moments, while leaving lower moments unchanged. We apply this framework to document the changes in credit usage of consumers during the COVID-19 pandemic. We consider multinomial logit models of the dependence of credit-card balances, with categorical variables representing monthly seasonality, homeownership status, and credit scores. We find that, relative to our forecasts, consumers have greatly reduced their use of credit. This result holds for homeowners and renters as well as consumers with both high and low credit scores.

8.
Can J Econ ; 55(Suppl 1): 88-114, 2022 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38607843

RESUMEN

The recent COVID-19 pandemic has devastated economies worldwide. Using detailed, monthly data from a major consumer credit reporting agency in Canada, we have examined individuals' use of credit cards and home-equity lines of credit (HELOCs). We found a dramatic leftward shift in the distribution of credit card and HELOC outstanding balances, providing evidence for a widespread reduction in credit usage. Our findings suggest that, during the COVID-19 recession, Canadian consumers were able to meet their financial needs without increasing their debt burdens. These results complement other findings concerning a decline in consumer spending and the results of government assistance programs, and imply that the economic consequences of this pandemic are very different from those in other recessions.


Recours au crédit à la consommation au Canada au cours de la pandémie de coronavirus. La récente pandémie de COVID­19 a ravagé les économies mondiales. Grâce aux données mensuelles détaillées d'une des agences d'évaluation du crédit les plus importantes du pays, nous avons examiné le recours aux cartes de crédit et aux marges de crédit hypothécaires des Canadiens. Sur les figures illustrant la distribution des soldes impayés de cartes de crédit et de marges de crédit hypothécaires, nous constatons un important déplacement vers la gauche, ce qui reflète un fléchissement généralisé du recours au crédit. Nos résultats suggèrent qu'au cours de la récession provoquée par la COVID­19, les consommateurs canadiens ont pu satisfaire leurs besoins financiers sans alourdir leurs dettes. Ces conclusions complètent d'autres observations, notamment sur la baisse des dépenses de consommation ou sur l'effet des programmes d'aide du gouvernement, et laissent entendre que les conséquences économiques de cette pandémie sont très différentes de celles observées dans d'autres types de récession.

9.
Clin Radiol ; 76(4): 314.e9-314.e15, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33334554

RESUMEN

AIM: To evaluate the safety and efficacy of transarterial embolisation (TAE) of dorsal pancreatic artery (DPA) haemorrhage. MATERIALS AND METHODS: Nineteen consecutive patients (M:F = 16:3, mean age 59.6 years) who underwent TAE of DPA in three tertiary medical centres between January 2001 to January 2020 were reviewed retrospectively. Angiographic features and the technical and clinical outcomes of TAE were analysed. RESULTS: The clinical presentations were a bloody drain from the Jackson-Pratt drainage tube (n=8), melaena (n=7), abdominal pain (n=4), and haematochezia (n=3). Angiographic findings included pseudoaneurysm (n=14), contrast media extravasation (n=4), or abrupt cut-off of the arterial branch (n=1). The NBCA (N-butyl-cyanoacrylate; n=4), microcoils (n=4), and a combination of these agents (n=7) were used as embolic agents. The most common origin of the DPA in the present study cohort was the splenic artery (n=7), followed by the coeliac trunk (n=4), common hepatic artery (n=4), and superior mesenteric artery (n=4). Technical and clinical success rates were 100% and 84.2% (16/19), respectively. Of the three clinically unsuccessful cases, two patients were revealed to have newly developed bleeding from another artery. The other patient expired 1 day after the TAE procedure due to a progression of hepatic failure. In one patient, an asymptomatic non-target embolisation occurred in the right posterior tibial artery as a procedure-related complication. No major complications were observed. CONCLUSION: TAE is safe and effective for the management of bleeding from the DPA. It is important to be aware of the DPA as a potential bleeding source, including the relevant clinical characteristics.


Asunto(s)
Embolización Terapéutica/métodos , Hemorragia/terapia , Páncreas/irrigación sanguínea , Adulto , Anciano , Anciano de 80 o más Años , Angiografía , Arterias/diagnóstico por imagen , Angiografía por Tomografía Computarizada , Embolización Terapéutica/efectos adversos , Femenino , Hemorragia/diagnóstico por imagen , Hemorragia/etiología , Humanos , Masculino , Persona de Mediana Edad , Páncreas/diagnóstico por imagen , Resultado del Tratamiento
10.
J Exp Child Psychol ; 202: 104995, 2021 02.
Artículo en Inglés | MEDLINE | ID: mdl-33096368

RESUMEN

Destination memory (the ability to remember who one has told information to) has been studied in adult samples, but not with child participants. The goals of the current research were to describe the development of children's destination memory abilities across early to middle childhood and to compare destination memory with source-monitoring abilities within the same age range. In two studies, children aged 5-10 years had conversations with two puppets and were later asked to recall which puppet they had disclosed specific information to. Study 1 (N = 86) revealed age to be a significant predictor of destination memory accuracy. Study 2 (N = 90) demonstrated that source memory and destination memory were related and shared a similar developmental trajectory but that source accuracy was higher on average than destination accuracy. This research contributes to our theoretical understanding of children's memory development, and directions for future research are highlighted in the Discussion. Implications for investigative interviews in which children are asked about prior disclosures are discussed.


Asunto(s)
Desarrollo Infantil , Revelación , Recuerdo Mental , Niño , Preescolar , Femenino , Humanos , Masculino , Juego e Implementos de Juego
11.
BMC Public Health ; 21(1): 46, 2021 01 06.
Artículo en Inglés | MEDLINE | ID: mdl-33407291

RESUMEN

BACKGROUND: Over the last 10 years HENRY has been working to reduce and prevent child obesity by training health and early years professionals to deliver its evidence-based programme to parents. The aim and unique contribution of this study was to evaluate whether training volunteers to deliver this programme on a one-to-one basis was feasible. METHODS: Mixed-methods service evaluation with parent-reported pre- and post-programme outcomes and focus groups conducted with parents and volunteer facilitators. The programme consisted of 8 one-to-one sessions delivered weekly by volunteers (n = 18) to build food and activity-related knowledge, skills, and understanding, and improve parenting efficacy, and parent and child eating and physical activity. Programmes took place at parent's (n = 69) home or local community venues in four London boroughs, United Kingdom. Parent-reported parenting efficacy, emotional wellbeing, eating, and physical activity data were captured, alongside parent ratings of the programme and volunteer ratings of the training. Parent and volunteer focus groups explored involvement, expectations, and experiences of the programme, training and delivery, feedback, and impact. RESULTS: Parents were mostly female, had varied ethnic backgrounds, and were often not working but well educated. There were statistically significant improvements of a medium-to-large size in parent and child emotional wellbeing, parenting efficacy, fruit and vegetable consumption, family eating and food purchasing behaviours. Parent ratings of the programme were positive and qualitative data highlighted the holistic nature of the programme, which focused on more than just food, and the relationships with volunteers as key facets. Volunteers were also mostly female, had varied ethnic backgrounds, and were often well educated, but more likely to be employed than parents. Volunteers rated the training and delivery as useful in enabling them to deliver the programme confidently and for their own wellbeing. Despite finding some sessions challenging emotionally, volunteers reported positive family lifestyle improvements by parents and children and that the experience would be useful for future employment. CONCLUSIONS: It is feasible to recruit and train volunteers to deliver a structured preschool obesity prevention programme, which parents considered acceptable and enjoyable, with preliminary reports of parent and child benefits.


Asunto(s)
Responsabilidad Parental , Obesidad Infantil , Niño , Preescolar , Estudios de Factibilidad , Femenino , Humanos , Londres , Masculino , Padres , Obesidad Infantil/prevención & control , Reino Unido , Voluntarios
12.
J Eur Acad Dermatol Venereol ; 35(8): 1655-1669, 2021 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-33914972

RESUMEN

Degos disease (atrophic papulosis) is a rare vasculopathy with cutaneous and systemic manifestations. Although potentially fatal, the characteristics of and treatments for Degos disease variants are not adequately described. We conducted a systematic review to summarize cutaneous and systemic presentations, treatments and outcomes of malignant (MAP) and benign (BAP) variants of Degos disease. A comprehensive search was conducted on Embase, MEDLINE, CINAHL and CENTRAL on 27 October 2020, which yielded 254 original studies reporting cases of Degos disease. A total of 357 patients were included in the analysis. Mean age of onset was 33.9 years. MAP was most commonly reported (63.8%, n = 228/357), with 56.6% (n = 129/228) mortality. Cutaneous lesions were usually asymptomatic (26.3%, n = 81/308) and localized to the trunk (57.7%, n = 206/357) and extremities (56.8%, n = 203/357). Systemic involvement developed within 2 years on average, ranging from 0 to 28 years. Anti-platelet monotherapy had a complete resolution rate of 42.3% (n = 11/26) in BAP and 20.0% (n = 7/35) in MAP. Based on the findings of the study, most cases of Degos disease are malignant with high mortality, and even benign cutaneous cases may develop systemic disease in as late as 28 years. Anti-platelet monotherapies may prove effective against both variants. Further studies are needed to confirm these findings.


Asunto(s)
Enfermedades del Tejido Conjuntivo , Papulosis Atrófica Maligna , Adulto , Atrofia , Humanos , Piel , Resultado del Tratamiento
13.
BMC Med Ethics ; 22(1): 99, 2021 07 23.
Artículo en Inglés | MEDLINE | ID: mdl-34301238

RESUMEN

BACKGROUND: Clinical ethics case consultations (CECCs) provide a structured approach in situations of ethical uncertainty or conflicts. There have been increasing calls in recent years to assess the quality of CECCs by means of empirical research. This study provides detailed data of a descriptive quantitative and qualitative evaluation of a CECC service in a department of cardiology and intensive care at a German university hospital. METHODS: Semi-structured document analysis of CECCs was conducted in the period of November 1, 2018, to May 31, 2020. All documents were analysed by two researchers independently. RESULTS: Twenty-four CECCs were requested within the study period, of which most (n = 22; 92%) had been initiated by physicians of the department. The patients were an average of 79 years old (R: 43-96), and 14 (58%) patients were female. The median length of stay prior to request was 12.5 days (R: 1-65 days). The most frequent diagnoses (several diagnoses possible) were cardiology-related (n = 29), followed by sepsis (n = 11) and cancer (n = 6). Twenty patients lacked decisional capacity. The main reason for a CECC request was uncertainty about the balancing of potential benefit and harm related to the medically indicated treatment (n = 18). Further reasons included differing views regarding the best individual treatment option between health professionals and patients (n = 3) or between different team members (n = 3). Consensus between participants could be reached in 18 (75%) consultations. The implementation of a disease specific treatment intervention was recommended in five cases. Palliative care and limitation of further disease specific interventions was recommended in 12 cases. CONCLUSIONS: To the best of our knowledge, this is the first in-depth evaluation of a CECC service set up for an academic department of cardiology and intensive medical care. Patient characteristics and the issues deliberated during CECC provide a starting point for the development and testing of more tailored clinical ethics support services and research on CECC outcomes.


Asunto(s)
Cardiología , Consultoría Ética , Anciano , Cuidados Críticos , Ética Clínica , Femenino , Personal de Salud , Humanos , Derivación y Consulta
14.
Phys Rev Lett ; 125(2): 025301, 2020 Jul 10.
Artículo en Inglés | MEDLINE | ID: mdl-32701340

RESUMEN

Turbulent flow restricted to two dimensions can spontaneously develop order on large scales, defying entropy expectations and in sharp contrast with turbulence in three dimensions where nonlinear turbulent processes act to destroy large-scale order. In this work we report the observation of unusual turbulent behavior in steady-state flow of superfluid ^{4}He-a liquid with vanishing viscosity and discrete vorticity-in a nearly two-dimensional channel. Surprisingly, for a range of experimental parameters, turbulence is observed to exist in two bistable states. This bistability can be well explained by the appearance of large-scale regions of flow of opposite vorticity.

15.
Phys Rev Lett ; 124(1): 015301, 2020 Jan 10.
Artículo en Inglés | MEDLINE | ID: mdl-31976679

RESUMEN

Superfluid ^{3}He under nanoscale confinement has generated significant interest due to the rich spectrum of phases with complex order parameters that may be stabilized. Experiments have uncovered a variety of interesting phenomena, but a complete picture of superfluid ^{3}He under confinement has remained elusive. Here, we present phase diagrams of superfluid ^{3}He under varying degrees of uniaxial confinement, over a wide range of pressures, which elucidate the progressive stability of both the A phase, as well as a growing region of stable pair density wave state.

16.
Int J Neuropsychopharmacol ; 22(7): 426-434, 2019 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-31152167

RESUMEN

BACKGROUND: Microdosing with psychedelics has gained considerable media attention where it is portrayed as a performance enhancer, especially popular on the work floor. While reports are in general positive, scientific evidence about potential negative effects is lacking aside from the prevalence and motives for use. The present study addressed this gap by surveying psychedelic users about their experience with microdosing including their dosing schedule, motivation, and potential experienced negative effects. METHODS: An online questionnaire was launched on several websites and fora between March and July 2018. Respondents who had consented, were 18 years of age or older, and had experience with microdosing were included in the analyses. RESULTS: In total, 1116 of the respondents were either currently microdosing (79.5%) or microdosed in the past (20.5%). Lysergic acid diethylamide (10 mcg) and psilocybin (0.5 g) were the most commonly used psychedelics with a microdosing frequency between 2 and 4 times per week. The majority of users, however, were oblivious about the consumed dose. Performance enhancement was the main motive to microdose (37%). The most reported negative effects were of psychological nature and occurred acutely while under the influence. CONCLUSION: In line with media reports and anecdotes, the majority of our respondents microdosed to enhance performance. Negative effects occurred mostly acutely after substance consumption. However, the main reason to have stopped microdosing was that it was not effective. Future experimental placebo-controlled studies are needed to test whether performance enhancement can be quantified and to assess potential negative effects after longer term microdosing.


Asunto(s)
Alucinógenos/administración & dosificación , Alucinógenos/efectos adversos , Motivación , Sustancias para Mejorar el Rendimiento/administración & dosificación , Sustancias para Mejorar el Rendimiento/efectos adversos , Trastornos Relacionados con Sustancias/psicología , Adulto , Femenino , Humanos , Dietilamida del Ácido Lisérgico/administración & dosificación , Dietilamida del Ácido Lisérgico/efectos adversos , Masculino , Psilocibina/administración & dosificación , Psilocibina/efectos adversos , Encuestas y Cuestionarios
17.
Nature ; 497(7451): 598-602, 2013 May 30.
Artículo en Inglés | MEDLINE | ID: mdl-23676673

RESUMEN

Electrons moving through a spatially periodic lattice potential develop a quantized energy spectrum consisting of discrete Bloch bands. In two dimensions, electrons moving through a magnetic field also develop a quantized energy spectrum, consisting of highly degenerate Landau energy levels. When subject to both a magnetic field and a periodic electrostatic potential, two-dimensional systems of electrons exhibit a self-similar recursive energy spectrum. Known as Hofstadter's butterfly, this complex spectrum results from an interplay between the characteristic lengths associated with the two quantizing fields, and is one of the first quantum fractals discovered in physics. In the decades since its prediction, experimental attempts to study this effect have been limited by difficulties in reconciling the two length scales. Typical atomic lattices (with periodicities of less than one nanometre) require unfeasibly large magnetic fields to reach the commensurability condition, and in artificially engineered structures (with periodicities greater than about 100 nanometres) the corresponding fields are too small to overcome disorder completely. Here we demonstrate that moiré superlattices arising in bilayer graphene coupled to hexagonal boron nitride provide a periodic modulation with ideal length scales of the order of ten nanometres, enabling unprecedented experimental access to the fractal spectrum. We confirm that quantum Hall features associated with the fractal gaps are described by two integer topological quantum numbers, and report evidence of their recursive structure. Observation of a Hofstadter spectrum in bilayer graphene means that it is possible to investigate emergent behaviour within a fractal energy landscape in a system with tunable internal degrees of freedom.

18.
Child Care Health Dev ; 45(6): 850-860, 2019 11.
Artículo en Inglés | MEDLINE | ID: mdl-31209923

RESUMEN

BACKGROUND: Childhood obesity is a major public health concern. In the United Kingdom, a quarter of children are overweight or obese at age 5 years. Overweight and obese children are more likely to develop serious health issues such as diabetes later in life. Consequently, there is an urgent need for effective, early obesity prevention and intervention. This study investigated the impact of an 8-week child obesity intervention-HENRY (Health Exercise Nutrition for the Really Young)-designed to help parents with preschool children develop the skills and knowledge needed to improve family lifestyle and well-being. We were particularly interested in exploring the potential mechanisms by which HENRY may have a positive impact. METHOD: Focus groups (n = 7, total participants = 39) were completed with mothers attending the HENRY programme at one of seven locations across England. They took place within 2 weeks of programme completion. Follow-up telephone interviews were completed with a subsample of participants (n = 10) between 17 and 21 weeks later. RESULTS: Parents consistently reported enhanced self-efficacy in terms of improved confidence in their ability to encourage healthier behaviours such as eating fruit and vegetables and increasing physical activity, and improvements to family health behaviours. Many changes were reportedly sustained at follow-up. Data provided insights into the potential mechanisms that created the conditions for the positive changes. Participants described the importance of mutual support, being listened to by facilitators, and encouragement to identify their own ideas. Their comments indicated the success of a solution-focused, strength-based, partnership approach to supporting family lifestyle change. CONCLUSION: The results of this study contribute to the body of evidence suggesting that HENRY may have a positive impact on parenting and family lifestyle behaviour. Although data were collected in 2011, the findings contribute to an understanding of the components of effective obesity prevention in young children.


Asunto(s)
Dieta Saludable/estadística & datos numéricos , Conductas Relacionadas con la Salud , Responsabilidad Parental , Padres/educación , Obesidad Infantil/prevención & control , Logro , Adulto , Niño , Preescolar , Empoderamiento , Ejercicio Físico , Salud de la Familia , Femenino , Estudios de Seguimiento , Conocimientos, Actitudes y Práctica en Salud , Promoción de la Salud , Humanos , Masculino , Padres/psicología , Tamaño de la Porción , Reino Unido/epidemiología
19.
Int J Obes (Lond) ; 42(2): 270-279, 2018 02.
Artículo en Inglés | MEDLINE | ID: mdl-28811651

RESUMEN

Non-alcoholic fatty liver disease and non-alcoholic steatohepatitis are characterized by an increase in hepatic triglyceride content with infiltration of immune cells, which can cause steatohepatitis and hepatic insulin resistance. C-C chemokine receptor 7 (CCR7) is primarily expressed in immune cells, and CCR7 deficiency leads to the development of multi-organ autoimmunity, chronic renal disease and autoimmune diabetes. Here, we investigated the effect of CCR7 on hepatic steatosis in a mouse model and its underlying mechanism. Our results demonstrated that body and liver weights were higher in the CCR7-/- mice than in the wild-type (WT) mice when they were fed a high-fat diet. Further, glucose tolerance and insulin sensitivity were markedly diminished in CCR7-/- mice. The number of invariant natural killer T (iNKT) cells was reduced in the livers of the CCR7-/- mice. Moreover, liver inflammation was detected in obese CCR7-/- mice, which was ameliorated by the adoptive transfer of hepatic mononuclear cells from WT mice, but not through the transfer of hepatic mononuclear cells from CD1d-/- or interleukin-10-deficient (IL-10-/-) mice. Overall, these results suggest that CCR7+ mononuclear cells in the liver could regulate obesity-induced hepatic steatosis via induction of IL-10-expressing iNKT cells.


Asunto(s)
Inflamación/fisiopatología , Hígado/patología , Células T Asesinas Naturales/fisiología , Enfermedad del Hígado Graso no Alcohólico/patología , Obesidad/fisiopatología , Receptores CCR7/metabolismo , Animales , Modelos Animales de Enfermedad , Inflamación/metabolismo , Masculino , Ratones , Ratones Obesos , Enfermedad del Hígado Graso no Alcohólico/etiología , Obesidad/metabolismo , Triglicéridos
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