1,400 results on '"Macchi A"'
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2. Perception of Facial Cues to Trustworthiness in Infancy: Insights from the Spatial Frequency Filtering Approach.
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Silvestri, Valentina and Macchi Cassia, Viola
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TRUST , *SOCIAL skills , *SPATIAL filters , *INFANTS , *FACIAL expression , *FRIENDSHIP , *FACIAL expression & emotions (Psychology) - Abstract
A crucial aspect of human social competence is the ability to spontaneously and rapidly infer from facial cues whether others are likely to approach us with friendliness or hostility—that is, trustworthiness. The rapid and automatic nature of these inferences has prompted the claim that they may originate from evolutionary pressures to detect potential threats, thus enhancing our chances of survival. However, the developmental origins of this social skill remain a topic of ongoing debate. Recent evidence shows that infants' brains and looking time behaviors differentiate between faces varying along the trustworthiness continuum, but the question about the nature of the facial cues they rely on remains open. In this review, we propose the spatial frequency (SF) filtering approach (i.e., the selective removal of spatial frequency bands from the image) as a useful tool for investigating this question, and specifically whether infants' discrimination of facial expressions of emotion share common visual and neural mechanisms with discrimination of facial cues associated with trustworthiness inferences. The SF filtering approach could shed light on the neural and perceptual mechanisms underlying trustworthiness perception in infancy, providing insights into whether and how these mechanisms change across development. The evidence gathered through this method would prove critical to the understanding of the developmental origins of trustworthiness perception. [ABSTRACT FROM AUTHOR]
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- 2024
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3. Economic Impact Assessment of Structural Health Monitoring Systems on Helicopter Blade Beginning of Life.
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Ballarin, Pietro, Macchi, Marco, Roda, Irene, Sala, Giuseppe, Baldi, Andrea, Airoldi, Alessandro, and Sohn, Hoon
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STRUCTURAL health monitoring , *STRAIN gages , *HEALTH impact assessment , *FLIGHT testing , *OPTICAL sensors - Abstract
The economic impact of Structural Health Monitoring Systems based on optical fibre sensors is assessed in the development of composite helicopter rotor blades. Hence, the focus of this analysis is on the helicopter's Beginning Of Life stage. Two applications of the Structural Health Monitoring System are considered in the development of composite blades: curing cycle development and accomplishment of laboratory and flight certification tests. Optical fibre sensors measure the temperature field during the curing cycle and strain field during the laboratory tests and allow load identification during the load survey activity. It was found that Structural Health Monitoring Systems can potentially lead to economic benefits during the development of the blade provide that a reduction in the number of curing cycles and number of blades tested is achieved as a consequence of the improvement of the temperature and strain field quality. Moreover, an economic benefit could be achieved during the load survey activity, needed to complete the certification of the composite blade, avoiding the periodical maintenance of the applied strain gauges acquiring the strains during the flight. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Anticancer Activity of Delta-Tocotrienol in Human Hepatocarcinoma: Involvement of Autophagy Induction.
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Montagnani Marelli, Marina, Macchi, Chiara, Ruscica, Massimiliano, Sartori, Patrizia, and Moretti, Roberta Manuela
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THERAPEUTIC use of antineoplastic agents , *IN vitro studies , *LIVER tumors , *EPITHELIAL cells , *AUTOPHAGY , *DRUG resistance in cancer cells , *MITOCHONDRIA , *APOPTOSIS , *NECROSIS , *IN vivo studies , *CANCER cell culture , *CELLULAR signal transduction , *OXIDATIVE stress , *DESCRIPTIVE statistics , *REACTIVE oxygen species , *VITAMIN E , *CELL death , *LIVER , *HEPATOCELLULAR carcinoma , *LIVER transplantation - Abstract
Simple Summary: Hepatocellular carcinoma (HCC) is the predominant form of primary liver cancer (about 85–90%). In the advanced stage of the disease, existing therapies cause toxic side effects and patients often develop chemoresistance. It is therefore important to identify new compounds with low toxicity that can be used in patients with compromised liver and advanced HCC. The objective of this research was to study the antitumoral activity of delta-tocotrienol, a natural compound derived from Vitamin E, on human hepatocarcinoma cell lines. This study supports the evidence that this compound exerts an antitumoral action activating the autophagic process, leading to cancer cell death. We believe that these data may provide a basis for considering delta-tocotrienol as a potential adjuvant therapy for the treatment of advanced HCC. (1) Hepatocellular carcinoma (HCC) is the predominant form of primary liver cancer. Surgical resection, tumor ablation, and liver transplantation are curative treatments indicated for early-stage HCC. The management of intermediate and advanced stages of pathology is based on the use of systemic therapies which often show important side effects. Vitamin E-derivative tocotrienols (TTs) play antitumoral properties in different tumors. Here, we analyzed the activity of delta-TT (δ-TT) on HCC human cell lines. (2) We analyzed the ability of δ-TT to trigger apoptosis, to induce oxidative stress, autophagy, and mitophagy in HepG2 cell line. We evaluated the correlation between the activation of autophagy with the ability of δ-TT to induce cell death. (3) The data obtained demonstrate that δ-TT exerts an antiproliferative and proapoptotic effect in HCC cells. Furthermore, δ-TT induces the release of mitochondrial ROS and causes a structural and functional alteration of the mitochondria compatible with a fission process. Finally, δ-TT triggers selective autophagy process removing dysfunctional mitochondria. Inhibition of autophagy reversed the cytotoxic action of δ-TT. (4) Our results demonstrate that δ-TT through the activation of autophagy could represent a potential new approach in the treatment of advanced HCC. [ABSTRACT FROM AUTHOR]
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- 2024
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5. The transversoclasiotome: a novel instrument for examining the vertebral artery.
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Boscolo-Berto, Rafael, Macchi, Veronica, Tubbs, R. Shane, Emmi, Aron, Stecco, Carla, Loukas, Marios, Porzionato, Andrea, and De Caro, Raffaele
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Opening the foramen transversarium of the cervical vertebrae is necessary for accessing the vertebral vessels. There are no specialist tools for cutting the anterior lamina of the transverse processes, and alternatives lead to questionable results. A novel tool, the transversoclasiotome, is described and tested. The literature and patent databases were systematically reviewed. A blueprint of the transversoclasiotome was created, and the prototype was tested through autopsy on ten fresh-frozen cadavers within our Body Donation Program. The transversoclasiotome consists of two delicate branches mounted as a scissor, one a cutting jaw and the other a knocker with a rounded tip, both angled 30° to the principal axis. The jaws shut, facing each other in parallel. The cutting jaw corresponds to a slit on the knocker profile without protruding beyond it even when entirely closed. It acts by cutting and wedging. The testing autopsies demonstrated its suitability for its purpose, with an adequate response to the pressure exerted on the bone lamina. The section cut cleanly, without sliding off while closing on the bone. The vertebral vessels were not injured either during instrument insertion or cutting. Their morphological features are described. The transversoclasiotome has been proven appropriate for sectioning the anterior lamina of transverse processes of the cervical vertebrae. It meets the needs of clinical anatomy in teaching and training clinicians or surgeons, forensic clinical anatomy during medico-legal investigation, and research. [ABSTRACT FROM AUTHOR]
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- 2024
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6. Effect of a graded running race on lower limb muscle damage, jump performance and muscle soreness in men and women.
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Macchi, Robin, Kunimasa, Yoko, Chavet, Pascale, Corcelle, Baptiste, Pomportes, Laura, Fazzari, Camille, Hays, Arnaud, Vercruyssen, Fabrice, Rossi, Francesca, Bendahan, David, and Nicol, Caroline
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LEG physiology , *SKELETAL muscle injuries , *MYALGIA , *CROSS-sectional method , *MYOSITIS , *RESEARCH funding , *ENDURANCE sports , *RUNNING , *SPORTS injuries , *SEX distribution , *DESCRIPTIVE statistics , *ERGOMETRY , *CONVALESCENCE , *JUMPING , *ATHLETIC ability , *MUSCLES - Abstract
Purpose: Delayed structural and functional recovery after a 20 km graded running race was analyzed with respect to the sex effect. Method s : Thirteen female and 14 male recreational runners completed the race and three test sessions: one before (PRE) and two after, once on Day 1 or 2 (D1‐2) and then on Day 3 or 4 (D3‐4). Muscle damage was assessed indirectly using ultrasonography to quantify changes in cross‐sectional area (CSA) of 10 lower‐limb muscles. Delayed onset of muscle soreness (DOMS) was assessed for three muscle groups. Functional recovery was quantified by kinetic analysis of a squat jump (SJ) and a drop jump (DJ) test performed on a sledge ergometer. Linear mixed models were used to assess control group reproducibility and recovery patterns according to sex. Results: Regardless of sex, DOMS peaked at D1‐2 for all muscle groups and resolved at D3‐4. CSA was increased in each muscle group until D3‐4, especially in the semimembranosus muscle. A specific increase was found in the short head of the biceps femoris in women. Regardless of sex, SJ and DJ performances declined up to D3‐4. Depending on the muscle, positive and/or negative correlations were found between structural and functional changes. Some of these were sex‐specific. Conclusion: Structural and functional recovery was incomplete in both sexes up to D3‐4, although DOMS had disappeared. More emphasis should be placed on hamstring muscle recovery. Highlighting the intermuscular compensations that can occur during multi‐joint testing tasks, the structural‐functional relationships were either positive or negative, muscle‐ and sex‐dependent. [ABSTRACT FROM AUTHOR]
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- 2024
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7. α‐Synuclein Pathology in the Carotid Body: Experimental Evidence for a possible Contributor to Respiratory Impairment in Parkinson's Disease.
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Emmi, Aron, Macchi, Veronica, Stocco, Elena, Tushevski, Aleksandar, Antonini, Angelo, De Caro, Raffaele, and Porzionato, Andrea
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SOLITARY nucleus , *CAROTID body , *INTERNAL carotid artery , *HUMAN anatomy , *CENTRAL nervous system - Abstract
The article discusses the presence of α-Synuclein pathology in the carotid body, a chemosensory organ that plays a role in respiratory control. The study found evidence of α-Synuclein deposition in the carotid body and carotid sinus nerve in Parkinson's disease patients, suggesting a potential link to respiratory dysfunction in the disease. The findings highlight the need for further research on the role of the carotid body in respiratory control in Parkinson's disease and its implications for patient care. [Extracted from the article]
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- 2024
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8. ECCB2024: The 23rd European Conference on Computational Biology.
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Kukkonen-Macchi, Anu, Hautaniemi, Sampsa, Heil, Katharina F, Heinäniemi, Merja, Jensen, Lars Juhl, Junttila, Sini, Käll, Lukas, Laiho, Asta, Maccallum, Peter, Nykter, Matti, Persson, Bengt, Suomi, Tomi, Bossche, Tim Van Den, Nyrönen, Tommi H, and Elo, Laura L
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LIFE sciences , *ARTIFICIAL intelligence , *DATA privacy , *SCIENTIFIC literature , *COMPUTATIONAL biology , *DEEP learning - Abstract
The article provides information about the 23rd European Conference on Computational Biology (ECCB2024) held in Turku, Finland. The conference focuses on data and algorithms for health and science and attracts scientists and industry professionals from various disciplines. It showcases cutting-edge developments in computational biology, including systems biology, artificial intelligence, single-cell and spatial technologies, and data integration. The conference features keynote lectures, scientific debates, poster presentations, workshops, and tutorials. The ECCB2024 proceedings include 24 papers selected through a peer-review process, and the conference promotes gender equity and adheres to a code of conduct to ensure a safe and respectful environment for all attendees. [Extracted from the article]
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- 2024
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9. Prognostic Value of PCSK9 Levels in Premenopausal Women at Risk of Breast Cancer—Evidence from a 17-Year Follow-Up Study.
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Ruscica, Massimiliano, Macchi, Chiara, Gandini, Sara, Macis, Debora, Guerrieri-Gonzaga, Aliana, Aristarco, Valentina, Serrano, Davide, Lazzeroni, Matteo, Rizzuto, Alessandra Stefania, Gaeta, Aurora, Corsini, Alberto, Gulisano, Marcella, Johansson, Harriet, and Bonanni, Bernardo
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BREAST cancer prognosis , *BREAST tumor risk factors , *RISK assessment , *PERIMENOPAUSE , *PREDICTIVE tests , *HDL cholesterol , *ANTILIPEMIC agents , *WOMEN , *SECONDARY analysis , *BODY mass index , *RESEARCH funding , *SCIENTIFIC observation , *TUMOR markers , *DESCRIPTIVE statistics , *PROTEASE inhibitors , *LONGITUDINAL method , *ESTRADIOL , *LOW density lipoproteins , *CHOLESTEROL , *PROGRESSION-free survival , *CONFIDENCE intervals , *TRIGLYCERIDES , *REGRESSION analysis , *PROPORTIONAL hazards models - Abstract
Simple Summary: Breast cancer is recognized as the most common cancer within the female population. In this context, cholesterol is recognized as a vital component for the proliferation and survival of cancer cells. These cells primarily acquire cholesterol through the receptor-mediated uptake from external sources, including low-density lipoprotein (LDL), utilizing the endocytosis pathway. Thus, this observational study aimed to test the effectiveness of proprotein convertase subtilisin/kexin type 9 (PCSK9), one of the key regulators of cholesterol levels, as a prognostic biomarker in cancer onset. Although PCSK9 correlated with lipid parameters (e.g., cholesterol, LDL) and with 17 β-estradiol, our results do not portend PCSK9 is a prognostic biomarker, at least, in the context of breast neoplastic events. Background and aim: The involvement of cholesterol in cancer development remains a topic of debate, and its association with breast cancer has yet to be consistently demonstrated. Considering that circulating cholesterol levels depend on several concomitant processes, we tested the liability of plasma levels of proprotein convertase subtilisin/kexin type 9 (PCSK9), one of the key regulators of cholesterol levels, as a prognostic biomarker in the context of breast neoplastic events. Methods: Within a prospective randomized breast cancer prevention trial we measured baseline plasma levels of PCSK9. A total of 235 at-risk premenopausal women were randomized and followed up for 17 years. Participants enrolled in this placebo-controlled, phase II, double-blind trial were randomly assigned to receive either tamoxifen 5 mg/d or fenretinide 200 mg/d, both agents, or placebo for 2 years. The associations with breast cancer events were evaluated through competing risk and Cox regression survival models, adjusted for randomization strata (5-year Gail risk ≥ 1.3% vs. intraepithelial neoplasia or small invasive breast cancer of favorable prognosis), age, and treatment allocation. PCSK9 associations with biomarkers linked to breast cancer risk were assessed on blood samples collected at baseline. Results: The plasmatic PCSK9 median and interquartile range were 207 ng/mL and 170–252 ng/mL, respectively. Over a median follow-up period of 17 years and 89 breast neoplastic events, disease-free survival curves showed a hazard ratio of 1.002 (95% CI: 0.999–1.005, p = 0.22) for women with PCSK9 plasma levels ≥ 207 ng/mL compared to women with levels below 207 ng/mL. No differences between randomization strata were observed. We found a negative correlation between PCSK9 and estradiol (r = −0.305), maintained even after partial adjustment for BMI and age (r = −0.287). Cholesterol (r = 0.266), LDL-C (r = 0.207), non-HDL-C (r = 0.246), remnant cholesterol (r = 0.233), and triglycerides (r = 0.233) also correlated with PCSK9. Conclusions: In premenopausal women at risk of early-stage breast cancer, PCSK9 did not appear to have a role as a prognostic biomarker of breast neoplastic events. Larger studies are warranted investigating patients in different settings. [ABSTRACT FROM AUTHOR]
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- 2024
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10. Pressure stabilization effect on the donor–acceptor polyiodide chains in tetraethylammonium bis(diiodine) triiodide – insights from Raman spectroscopy.
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Poręba, Tomasz, Macchi, Piero, Casati, Nicola, and Sierański, Tomasz
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RAMAN spectroscopy , *TETRAETHYLAMMONIUM , *CRYSTAL surfaces , *INTERATOMIC distances , *X-ray diffraction - Abstract
Polyiodides present high bonding flexibility already at ambient conditions, and undergo significant pressure-induced structural deformations. Resonant Raman spectroscopy has been widely used to study I–I bonds in various polyiodides, but it carries a risk of photodecomposition due to the high visible-light absorption of iodine. In this study, tetraethylammonium (bis)diiodine triiodide (TEAI) has been investigated by resonant Raman spectroscopy up to 12.02(3) GPa. The effect of pressure on the intensities and positions of Raman bands has been evaluated and correlated with the interatomic I–I distances derived from high-pressure X-ray diffraction experiments. Pressure was shown to effectively stabilize TEAI against laser-induced photodecomposition, even after a long course of irradiation with the resonant laser light. Examination of a freshly exposed crystal surface revealed that TEAI superficially passivates with the layer of lower polyiodides, which prevents further iodine loss, and shows distinct pressure-induced behaviour. [ABSTRACT FROM AUTHOR]
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- 2024
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11. Muscle synergies inherent in simulated hypogravity running reveal flexible but not unconstrained locomotor control.
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Fazzari, Camille, Macchi, Robin, Kunimasa, Yoko, Ressam, Camélia, Casanova, Rémy, Chavet, Pascale, and Nicol, Caroline
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With human space exploration back in the spotlight, recent studies have investigated the neuromuscular adjustments to simulated hypogravity running. They have examined the activity of individual muscles, whereas the central nervous system may rather activate groups of functionally related muscles, known as muscle synergies. To understand how locomotor control adjusts to simulated hypogravity, we examined the temporal (motor primitives) and spatial (motor modules) components of muscle synergies in participants running sequentially at 100%, 60%, and 100% body weight on a treadmill. Our results highlighted the paradoxical nature of simulated hypogravity running: The reduced mechanical constraints allowed for a more flexible locomotor control, which correlated with the degree of spatiotemporal adjustments. Yet, the increased temporal (shortened stance phase) and sensory (deteriorated proprioceptive feedback) constraints required wider motor primitives and a higher contribution of the hamstring muscles during the stance phase. These results are a first step towards improving astronaut training protocols. [ABSTRACT FROM AUTHOR]
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- 2024
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12. Does a novel community-based outpatient palliative care intervention for Parkinson's disease and related disorders improve care? Qualitative results from patients and care partners.
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Bock, Meredith A, Macchi, Zachary A, Harrison, Krista L, Katz, Maya, Dini, Megan, Jones, Jacqueline, Ayele, Roman, Kutner, Jean S, Pantilat, Steven Z, Martin, Christine, Sillau, Stefan, and Kluger, Benzi
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PARKINSON'S disease treatment , *CAREGIVER attitudes , *THERAPEUTICS , *MEDICAL quality control , *NEUROLOGISTS , *HEALTH services accessibility , *COUNSELING , *ATTITUDE (Psychology) , *COMMUNITY health services , *PATIENTS' attitudes , *QUALITATIVE research , *PSYCHOLOGY of caregivers , *QUALITY assurance , *MEDICAL referrals , *COMMUNICATION , *HEALTH care teams , *RESEARCH funding , *THEMATIC analysis , *JUDGMENT sampling , *PATIENT compliance , *OUTPATIENT services in hospitals , *PALLIATIVE treatment , *MEDICAL needs assessment , *MEDICAL coding , *TELEMEDICINE - Abstract
Background: Palliative care has the potential to address significant unmet needs in people with Parkinson's disease and related disorders, but models that rely on in-person specialty palliative care teams have limited scalability. Aim: To describe patient and care partner experiences with a novel, community-based palliative care intervention for Parkinson's disease. Design: Qualitative study embedded in a randomized clinical trial to document participant experiences with a novel palliative care intervention (community neurologist training and remote team-based specialist palliative care). Transcripts were coded and thematically analyzed through a combination of team-based inductive and deductive coding. Setting/Participants: Twenty-eight patients and 33 care partners purposively sampled from participants in a randomized clinical trial of a palliative care intervention for Parkinson's disease and related disorders conducted at nine sites. Results: Benefits of the intervention included management of a wider range of non-motor symptoms, facilitation of conversations about the future, greater engagement with the health care team, and increased referrals to resources. Participants identified areas of improvement, including uptake of palliative care training by community neurologists, additional prognostic counseling, and clarity and timeliness of communication with the multidisciplinary team. Conclusions: Clinicians caring for people with Parkinson's disease and related disorders should screen for non-motor symptoms, provide regular prognostic counseling, and refer to specialty palliative care services earlier in the course of illness. Future interventions should be designed to promote uptake of palliative care training by community neurologists and further optimize referral to and coordination with in-person or remote specialty palliative teams. [ABSTRACT FROM AUTHOR]
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- 2024
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13. Tracking of structural defects induced by Eu-doping in β-Ag2MoO4: their influences on electrical properties.
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Macchi, Carlos, Petinardi, Guilherme Magalhaes, Freire, Leonardo Almeida, Castro, Miriam Susana, Aldao, Celso Manuel, Luiz, Thaís Marcial, Moura, Francisco, Simões, Alexandre Zirpoli, Moreno, Henrique, Longo, Elson, Somoza, Alberto, Assis, Marcelo, and Ponce, Miguel Adolfo
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POSITRON annihilation , *PHOTOLUMINESCENCE , *CARRIER density , *CRYSTAL grain boundaries , *IMPEDANCE spectroscopy - Abstract
In this study, several methods were employed to investigate the electrical characteristics of β-Ag2MoO4 systems, both Eu-doped and undoped, synthesized using the microwave-assisted hydrothermal method. The focus extended to understanding how synthesis time influences material defects, with doping fixed at 1%. A systematic shift in the silver vacancy (VAg) concentration was observed within the doped β-Ag2MoO4 system. Specifically, this study demonstrated that the incorporation of Eu3+ into polycrystalline β-Ag2MoO4 initially increases the VAg concentration. However, as the synthesis time progresses, the VAg concentration decreases, resulting in alterations in the resulting electrical properties, arising from the intricate interplay between the number of grain boundaries and carrier density. By combining information obtained from photoluminescence, positron annihilation lifetime spectroscopy, and impedance spectroscopy, a comprehensive conduction mechanism was formulated, shedding light on both doped and undoped β-Ag2MoO4 systems. [ABSTRACT FROM AUTHOR]
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- 2024
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14. The "Surprise Question" for Prognostication in People With Parkinson's Disease and Related Disorders.
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Mahes, Ananth, Macchi, Zachary A., Martin, Christine S., Katz, Maya, Galifianakis, Nicholas B., Pantilat, Steven Z., Kutner, Jean S., Sillau, Stefan, and Kluger, Benzi M.
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PARKINSON'S disease , *PALLIATIVE treatment , *TERMINAL care , *NEURODEGENERATION , *DESCRIPTIVE statistics - Abstract
Parkinson's disease and related disorders (PDRD) are fatal neurodegenerative disorders characterized by a fluctuating course that can complicate prognostication. The "surprise question" (SQ: "Would you be surprised if your patient died in the next year?") has been used to identify patients with limited prognosis but has not been assessed in PDRD. To determine the validity of the SQ in predicting 12-month mortality in PDRD. Data was analyzed from 301 patients and 34 community-based neurologists who were participating in a clinical trial of outpatient palliative care for patients with PDRD. Clinicians answered the SQ for each patient at baseline. Descriptive statistics at baseline, chi-square tests of independence, 2 × 2 and 2 × 3 cross tables were used. Survival analysis compared SQ responses using Kaplan-Meier curves. Risk estimate analyses identified patient characteristics associated with clinicians' responses. Mortality was 10.3% (N = 31) at 1 year. The sensitivity and specificity of the SQ was 80.7% and 58.9%, respectively with AUC = 0.70, positive predictive value of 18.4% and negative predictive value of 96.4%. Older age, atypical parkinsonism, and dementia were associated with responding "no" to the SQ. The SQ is sensitive to 12-month mortality in PDRD, with a high negative predictive value. The SQ may be useful for identifying patients less likely to die within a year and may be useful for identifying patients with palliative care needs outside of end-of-life care. This latter use may assist in mobilizing early and timely referral to specialist palliative care. [ABSTRACT FROM AUTHOR]
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- 2024
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15. Different incubation tasks in insight problem solving: evidence for unconscious analytic thought.
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Caravona, Laura and Macchi, Laura
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PROBLEM solving , *GOAL (Psychology) - Abstract
This paper explores the effect of different types of incubation task (visual, numerical and verbal) with various levels of attentional focus and cognitive effort (non-demanding, low-demanding and high-demanding) on the resolution of insight problems. The most effective was found to be the low-demanding task (regardless of its nature), which although requiring attentional focus, leaves resources available for the unconscious analytical restructuring process, obtaining a high percentage of success in solving the problem shortly after completion of the incubation task. Overall findings support the hypothesis of Unconscious Analytic Thought (UAT), according to which the restructuring required in insight problem solving implies a covert thinking process that includes a relevant, analytic and goal-oriented search. The findings are discussed in the light of UAT and are compared with the main theories of insight in problem solving. [ABSTRACT FROM AUTHOR]
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- 2023
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16. Operations-aware novelty detection framework for CNC machine tools: proposal and application.
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Macchi, Marco, Cattaneo, Laura, Polenghi, Adalberto, Bruno, Danilo, Mosci, Sofia, Ferriani, Fabio, and Caneva, Roberto
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NUMERICAL control of machine tools , *MACHINE tool manufacturing , *CONDITION-based maintenance , *INDUSTRIALISM , *FAILED states , *GAUSSIAN mixture models - Abstract
Digitisation offers manufacturing companies new opportunities to improve their operations and competitiveness in the market by unleashing potentialities related to real-time monitoring and control of operating machines. Through condition-based and predictive maintenance, the knowledge about the health state and probability of failure of the machines is improved for better decision-making. Amongst them, CNC machine tools do represent a complex case from a maintenance viewpoint as their operations are ever-changing and their high reliability brings to a lack, or limited set, of run-to-failure data. To address the problem, the research work proposes an operations-aware novelty detection framework for CNC machine tools based on already-in-place controllers. The framework is based on statistical modelling of the behaviour of the machine tools, namely through gradient boosting regression and Gaussian mixture models, to identify the health state considering varying operations through time. The proposed solution is verified on sixteen multi-axis CNC machine tools in a large manufacturing company. The results show that the proposed solution can effectively support maintenance decisions by informing on the health states while discerning between varying operations and abnormal/faulty states of interest. This solution represents a brick in a cloud-edge-based industrial information system stack that can be further developed for shop floor-integrated decision-making. [ABSTRACT FROM AUTHOR]
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- 2023
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17. An association study of cyclase‐associated protein 2 and frailty.
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Pelucchi, Silvia, Macchi, Chiara, D'Andrea, Laura, Rossi, Paolo Dionigi, Speciani, Michela Carola, Stringhi, Ramona, Ruscica, Massimiliano, Arosio, Beatrice, Di Luca, Monica, Cesari, Matteo, Edefonti, Valeria, and Marcello, Elena
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FRAILTY , *AGE , *OLDER people , *REGRESSION analysis , *PROTEINS , *MOLECULAR pathology - Abstract
Frailty is a geriatric syndrome that results from multisystem impairment caused by age‐associated accumulation of deficits. The frailty index is used to define the level of frailty. Several studies have searched for molecular biomarkers associated with frailty, to meet the needs for personalized care. Cyclase‐associated protein 2 (CAP2) is a multifunctional actin‐binding protein involved in various physiological and pathological processes, that might reflect frailty's intrinsic complexity. This study aimed to investigate the association between frailty index and circulating CAP2 concentration in 467 community‐dwelling older adults (median age: 79; range: 65–92 years) from Milan, Italy. The selected robust regression model showed that circulating CAP2 concentration was not associated with chronological age, as well as sex and education. However, circulating CAP2 concentration was significantly and inversely associated with the frailty index: a 0.1‐unit increase in frailty index leads to ~0.5‐point mean decrease in CAP2 concentration. Furthermore, mean CAP2 concentration was significantly lower in frail participants (i.e., frailty index ≥0.25) than in non‐frail participants. This study shows the association between serum CAP2 concentration and frailty status for the first time, highlighting the potential of CAP2 as a biomarker for age‐associated accumulation of deficits. [ABSTRACT FROM AUTHOR]
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- 2023
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18. Circulating PCSK9 as a prognostic biomarker of cardiovascular events in individuals with type 2 diabetes: evidence from a 16.8-year follow-up study.
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Ruscica, Massimiliano, Macchi, Chiara, Giuliani, Angelica, Rizzuto, Alessandra Stefania, Ramini, Deborah, Sbriscia, Matilde, Carugo, Stefano, Bonfigli, Anna Rita, Corsini, Alberto, Olivieri, Fabiola, and Sabbatinelli, Jacopo
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TYPE 2 diabetes , *MAJOR adverse cardiovascular events , *DIABETIC nephropathies , *CARDIOVASCULAR diseases , *BIOMARKERS , *DYSLIPIDEMIA - Abstract
Background: Atherosclerotic cardiovascular disease (ASCVD) is the leading cause of morbidity and mortality, being twofold to fourfold more common in patients with type 2 diabetes mellitus (T2DM) than in individuals without diabetes. However, despite this decade-old knowledge, the identification of a specific prognostic risk biomarker remains particularly challenging. Methods: Taking advantage of a large sample of Caucasian patients (n = 529) with a diagnosis of T2DM followed for a median of 16.8 years, the present study was aimed at testing the hypothesis that fasting serum proprotein convertase subtilisin/kexin type 9 (PCSK9) levels could be prognostic for major adverse cardiovascular events (MACE) and all-cause mortality. Results: Median levels of PCSK9 were 259.8 ng/mL, being higher in women compared to men and increasing even more in the presence of a complication (e.g., diabetic kidney disease). PCSK9 positively correlated with markers of blood glucose homeostasis (e.g., HbA1c, fasting insulin and HOMA-IR) and the atherogenic lipid profile (e.g., non-HDL-C, apoB and remnant cholesterol). Serum PCSK9 predicted new-onset of MACE, either fatal or non-fatal, only in women (Odds Ratio: 2.26, 95% CI 1.12–4.58) and all-cause mortality only in men (Hazard Ratio: 1.79, 95% CI 1.13–2.82). Conclusions: Considering that up to two-thirds of individuals with T2DM develop ASCVD in their lifetime, the assessment of circulating PCSK9 levels can be envisioned within the context of a biomarker-based strategy of risk stratification. However, the sex difference found highlights an urgent need to develop sex-specific risk assessment strategies. Trial registration: It is a retrospective study. [ABSTRACT FROM AUTHOR]
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- 2023
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19. Is tumoral melanosis still a challenge? A case of tumoral melanosis without metastasis.
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Massa, Alessandra, Macchi, Stefano, Manuguerra, Roberta, Brusasco, Marco, Aouadi, Mohamed, Feliciani, Claudio, and Satolli, Francesca
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MELANOSIS , *METASTASIS , *MELANOCYTES , *PROGNOSIS , *PATHOGENESIS , *MELANOMA - Abstract
This article discusses a rare condition called tumoral melanosis (TM), which is characterized by the presence of dense dermal aggregates of melanophages without melanocytes. The article presents a case study of an 83-year-old man with diffuse TM, who had previously been diagnosed with nodular animal-type melanoma. Despite the widespread blue pigmentation and the appearance of multiple lesions, no evidence of metastasis was found. The article highlights the exceptional nature of this case, as TM is typically associated with metastatic disease. The prognosis and pathogenesis of TM are still not fully understood, and further research is needed to better understand this condition. [Extracted from the article]
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- 2023
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20. Type II single coronary artery from right aortic sinus, retro-aortic left coronary artery and dual LAD: a rare association of coronary arterial variations.
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Macchi, Edoardo, Piacentino, Filippo, Curti, Marco, Gnesutta, Aroa, Ossola, Christian, Timb, FilsTimb, De Ponti, Roberto, Fontana, Federico, and Venturini, Massimo
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CORONARY arteries , *SINUS of valsalva , *ANATOMICAL variation , *ELECTROCARDIOGRAPHY , *CORONARY angiography - Abstract
Purpose: The coronary arterial tree has a wide range of possible benign anatomical variations. It is important to differentiate them from coronary arterial anomalies, which can remain asymptomatic or in some cases lead to sudden death if undiagnosed. Methods: A 42-year-old female patient with a transient ST depression in right precordial leads performed an ECG-gated computed tomography angiography with dual layer spectral CT (IQon Elite Spectral CT, Philips, Amsterdam, The Netherlands) at Circolo Hospital of Varese. Results: A rare variant was observed and studied: a single common trunk arising from the right sinus of Valsalva which branches into a right coronary artery, a left anterior descending artery with malignant course and a left main with a retroaortic course; the left main gives origin to a dual anterior interventricular artery ("Dual LAD") and a left circumflex artery. Conclusions: This type of variation was never described in the English literature. Identifying this variant is crucial for potential ischemic complications during sports activities or with the onset of atherosclerotic disease. [ABSTRACT FROM AUTHOR]
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- 2023
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21. Endogenous Extracellular Matrix Regulates the Response of Osteosarcoma 3D Spheroids to Doxorubicin.
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Cortini, Margherita, Macchi, Francesca, Reggiani, Francesca, Vitale, Emanuele, Lipreri, Maria Veronica, Perut, Francesca, Ciarrocchi, Alessia, Baldini, Nicola, and Avnet, Sofia
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DISEASE progression , *IN vitro studies , *FIBRONECTINS , *OSTEOSARCOMA , *DOXORUBICIN , *RESEARCH funding , *EXTRACELLULAR space - Abstract
Simple Summary: The pathogenesis of osteosarcoma relies on complex interactions between developing cancer and surrounding tissue, which includes proteins of the extracellular matrix. Mapping ECM–cell interactions and ECM composition is highly important to understand and predict cancer response to chemotherapy and potentially give rise to alternative targets for therapy. Our study aims at generating a 3D model that recapitulates interactions of cancer cells with ECM components and with non-tumor stromal cells and at elucidating the role of ECM deposition in chemotherapy response. Dissecting the contribution of the tumor environment and the role of collagenic and non-collagenic proteins of the ECM will provide additional knowledge for the development of new antitumor strategies. The extracellular matrix (ECM) modulates cell behavior, shape, and viability as well as mechanical properties. In recent years, ECM disregulation and aberrant remodeling has gained considerable attention in cancer targeting and prevention since it may stimulate tumorigenesis and metastasis. Here, we developed an in vitro model that aims at mimicking the in vivo tumor microenvironment by recapitulating the interactions between osteosarcoma (OS) cells and ECM with respect to cancer progression. We long-term cultured 3D OS spheroids made of metastatic or non-metastatic OS cells mixed with mesenchymal stromal cells (MSCs); confirmed the deposition of ECM proteins such as Type I collagen, Type III collagen, and fibronectin by the stromal component at the interface between tumor cells and MSCs; and found that ECM secretion is inhibited by a neutralizing anti-IL-6 antibody, suggesting a new role of this cytokine in OS ECM deposition. Most importantly, we showed that the cytotoxic effect of doxorubicin is reduced by the presence of Type I collagen. We thus conclude that ECM protein deposition is crucial for modelling and studying drug response. Our results also suggest that targeting ECM proteins might improve the outcome of a subset of chemoresistant tumors. [ABSTRACT FROM AUTHOR]
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- 2023
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22. Predictive factors of reading in children with developmental language disorder.
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Macchi, Lucie, Schelstraete, Marie-Anne, Ané, Cécile, Boidein, Françoise, Riquet, Audrey, and Casalis, Séverine
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LANGUAGE disorders , *WORD recognition , *ORAL communication , *PHONOLOGICAL awareness , *EVIDENCE gaps - Abstract
• Oral language skills are strong predictors of reading skills. • Children with Developmental Language Disorder encounter reading difficulties in higher proportion than control children and generally achieve lower scores in reading. • Classical predictors in control children are also found in children with DLD. • Phonological instability appeared as a promising predictor of reading irregular words, particularly in children with DLD. The current study aimed to fill the gap in research on factors predictive of word reading in French-speaking children with developmental language disorder (DLD) by finding out whether the same predictors of written word recognition evidenced in typically developing children would be retrieved in children with DLD or if some predictors could be specific to children with DLD, especially in the phonological domain. In total, 38 children with DLD and 44 control children were followed from 6 to 8 years in a longitudinal design including two time points: (1) just before explicit reading instruction, where potential predictors of reading were assessed (oral language skills and reading-related skills), and (2) after 2 years of learning to read, where isolated word reading and text reading were assessed in addition to the assessment of oral language skills and reading-related skills. The study mainly showed that the predictors of reading identified in typically developing children are retrieved in children with DLD except for phonemic awareness; the latter result was probably explained by a floor effect. Among the predictors in the phonological domain, phonological instability appeared as a promising predictor of reading irregular words. These results are consistent with the findings of many previous studies and tend to confirm the idea of a strong link between oral phonological skills and written word recognition skills; they also call for attention to specific features in the phonological development of children with DLD when learning to read, particularly phonological instability as a direction for future exploration. [ABSTRACT FROM AUTHOR]
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- 2024
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23. Microstructural design by combining nanograins and spinodal decomposition in a Fe-Cr alloy.
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Macchi, Juan, Nakonechna, Olha, Henry, Ronan, Castro, Celia, Edalati, Kaveh, De Geuser, Frederic, Sauvage, Xavier, and Lefebvre, Williams
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ATOM-probe tomography , *FRACTURE toughness , *GRAIN size , *TORSION , *ALLOYS - Abstract
Microstructure design of new high-performance alloys requires the combination of multiple hardening mechanisms. This study explores combining nanograins with spinodal decomposition strengthening in an Fe-51.4Cr (at.%) alloy. High-pressure torsion (HPT) produced a nanostructure with a 51 nm grain size. Atom probe tomography analysis of deformed and annealed samples revealed spinodal decomposition after one hour of annealing. HPT accelerated decomposition kinetics is due to the high vacancy concentration. Microhardness remained stable due to spinodal hardening, despite a decrease in the Hall-Petch strengthening contribution. However, fracture toughness decreased. [Display omitted] [ABSTRACT FROM AUTHOR]
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- 2024
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24. Comment on: "Interacting quantum and classical waves: Resonant and non-resonant energy transfer to electrons immersed in an intense electromagnetic wave" [Phys. Plasmas 29, 022107 (2022)].
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Macchi, A.
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CHARGE exchange , *ELECTROMAGNETIC waves , *ENERGY transfer , *EQUATIONS of motion , *SCHRODINGER equation - Abstract
The "rate of change of particle energy" can be trivially and explicitly calculated as HT ht from Eq. (13). A net energy only appears for HT ht , which may occur for a particle released from rest when the EM field is already on (a field-ionized electron, for example). Looking at Eq. (12), we see instead that HT ht is necessary to make the second term in Eq. (12) positive. [Extracted from the article]
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- 2023
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25. Osteopenia en una adolescente blanca hispana: reporte de caso.
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Angelica Trak-Fellermeier, Maria, Macchi, Alison K., Hernandez, Jacqueline, Galvan, Rodolfo, Hernandez, Yolangel, Gambon, Thresia, Martinez, Rebeca, and Palacios, Cristina
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CALCIUM supplements , *COVID-19 pandemic , *VITAMIN D deficiency , *DUAL-energy X-ray absorptiometry , *BODY composition , *NUTRITIONAL status - Abstract
Introduction. Poor lifestyle habits, vitamin D deficiency, and inadequate calcium intake, particularly during the COVID-19 pandemic, may contribute to severe osteopenia in childhood, increasing future fractures and osteoporosis risk. Materials and methodology. We here present a case of osteopenia in a 13-year-old white, Hispanic, premenarchal girl who completed the baseline visit of the MetA-Bone Trial during the COVID-19 pandemic. Using a dual-energy X-ray absorptiometry, we assessed bone mass content (BMC), total body and spine bone mass density (BMD), and body composition. We cover the girl’s health history and family history, pubertal development, intensity, duration, and frequency of physical activity and sleep, and nutrient intake (calcium and vitamin D), as well as anthropometric parameters, and bone and metabolic biomarkers. Results. The girl has a family history of osteoporosis (maternal grandfather) but no previous fractures; moderate outdoor activity was <1 hour/day 3 times/week with 8 hours/day of sleep. Consumption of dairy products and vegetables was <1 serving/day. Lab blood tests confirmed vitamin D deficiency (serum 25(OH) D: 9 ng/ml) and hyperphosphatemia (5.2 mg/dL); other tests were normal. DXA scan Z‐score was ‐2.1 SD (indicative of osteopenia by age and sex). The girl was referred to a pediatrician, who confirmed the results, and prescribed a daily supplement with 2000 IU of vitamin D and 1000 mg of calcium. Conclusions. Seclusion during the COVID pandemic may have contributed to the severity of the findings. Therefore, we recommend screening children undergoing growth spurts for vitamin D, calcium, and poor lifestyle habits during and after the pandemic [ABSTRACT FROM AUTHOR]
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- 2023
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26. Geomorphology of the Liera catchment (Dolomites, NE Italy): understanding landscape response to an extreme event.
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Macchi, Giorgia, Monegato, Giovanni, Pasuto, Alessandro, Boretto, Gabriella, Crema, Stefano, Marchi, Lorenzo, and Cavalli, Marco
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DOLOMITE , *GEOMORPHOLOGY , *DEBRIS avalanches , *FIELD research , *LANDSCAPES , *GEOMORPHOLOGICAL mapping - Abstract
Geomorphological field surveys and mapping have been carried out in a catchment of the Dolomites (eastern Italian Alps) as part of a research project aiming at the assessment of sediment availability for mass wasting in mountain environments. The study area is the Liera catchment which was severely affected by a high-intensity, regional-scale storm named ‘Vaia’ (27–30 October 2018), which induced relevant morphological changes, caused a major flood in the main stream and triggered debris flows in many tributaries. This contribution gives a snapshot of the present-day state of the study area to improve the understanding of such a landscape by characterizing the processes that control its geomorphological spatiotemporal dynamics and evolution. [ABSTRACT FROM AUTHOR]
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- 2023
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27. Epigenetic machinery is functionally conserved in cephalopods.
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Macchi, Filippo, Edsinger, Eric, and Sadler, Kirsten C.
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CYTOSINE , *CEPHALOPODA , *EPIGENETICS , *DNA methylation , *GENE expression , *WHOLE genome sequencing - Abstract
Background: Epigenetic regulatory mechanisms are divergent across the animal kingdom, yet these mechanisms are not well studied in non-model organisms. Unique features of cephalopods make them attractive for investigating behavioral, sensory, developmental, and regenerative processes, and recent studies have elucidated novel features of genome organization and gene and transposon regulation in these animals. However, it is not known how epigenetics regulates these interesting cephalopod features. We combined bioinformatic and molecular analysis of Octopus bimaculoides to investigate the presence and pattern of DNA methylation and examined the presence of DNA methylation and 3 histone post-translational modifications across tissues of three cephalopod species. Results: We report a dynamic expression profile of the genes encoding conserved epigenetic regulators, including DNA methylation maintenance factors in octopus tissues. Levels of 5-methyl-cytosine in multiple tissues of octopus, squid, and bobtail squid were lower compared to vertebrates. Whole genome bisulfite sequencing of two regions of the brain and reduced representation bisulfite sequencing from a hatchling of O. bimaculoides revealed that less than 10% of CpGs are methylated in all samples, with a distinct pattern of 5-methyl-cytosine genome distribution characterized by enrichment in the bodies of a subset of 14,000 genes and absence from transposons. Hypermethylated genes have distinct functions and, strikingly, many showed similar expression levels across tissues while hypomethylated genes were silenced or expressed at low levels. Histone marks H3K27me3, H3K9me3, and H3K4me3 were detected at different levels across tissues of all species. Conclusions: Our results show that the DNA methylation and histone modification epigenetic machinery is conserved in cephalopods, and that, in octopus, 5-methyl-cytosine does not decorate transposable elements, but is enriched on the gene bodies of highly expressed genes and could cooperate with the histone code to regulate tissue-specific gene expression. [ABSTRACT FROM AUTHOR]
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- 2022
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28. Aggression Towards Caregivers in Parkinson's Disease and Related Disorders: A Mixed Methods Study.
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Macchi, Zachary A., Seshadri, Sandhya, Ayele, Roman, Bock, Meredith, Long, Judith, Coats, Heather, Miyasaki, Janis, Pantilat, Steven Z., Katz, Maya, Santos, Elizabeth J., Sillau, Stefan H., Lum, Hillary D., and Kluger, Benzi M.
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SERVICES for caregivers , *VERBAL behavior , *PARKINSON'S disease , *CAREGIVERS , *AGGRESSION (Psychology) , *MENTAL health , *THREATS of violence - Abstract
Background: Aggression is one manifestation of behavioral disturbances in neurodegenerative disease with emerging literature suggesting a high prevalence in Parkinson's disease and related disorders (PDRD). Objectives: Our aim was to describe characteristics, associated factors, and consequences of aggression towards caregivers in PDRD. Methods: This is a convergent mixed methods study, leveraging data from 296 PDRD patient–caregiver dyads in a clinical trial of palliative care and semi‐structured interviews with a subgroup of 14 caregivers who reported aggression. The primary outcome was baseline caregiver‐reported aggression. Using multivariate linear regression, baseline dyad characteristics (eg, measures of disease, psychosocial issues, caregiver strain) were examined to identify factors associated with aggression. Thematic analysis of interviews was used to augment these findings. Results: Associated variables included disease duration (r = 0.15, P < 0.05), patient grief (r = 0.22, P< 0.001), symptom burden (r = 0.18, r < 0.01), resistance to care (r = 0.40, P < 0.01), caregivers' depression (r = 0.16, P < 0.05), and caregiving burden (r = 0.34, P < 0.001). We identified five themes: (1) Aggressive behaviors range from verbal abuse to threats of physical violence; (2) Caregivers believe that aggressive behaviors result from the difficulty patients experience in coping with disease progression and related losses; (3) Caregivers' stress and mental health are worsened by aggressive behaviors; (4) Aggressive behaviors negatively affect patient–caregiver relationships; (5) Caregivers are ill‐prepared to manage aggressive behaviors and cope with the consequences on their own. Conclusions: Aggression in PDRD is driven by diverse factors (eg, grief, fluctuations in cognition) with serious consequences for caregivers. Neurologists and movement specialists should consider screening for aggression while prioritizing caregiver education and wellbeing. [ABSTRACT FROM AUTHOR]
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- 2022
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29. Prognostic significance of additional histologic features for subclassification of pathological T3 colon cancer.
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Macchi, Lorenzo, Bao, Quoc Riccardo, Albertoni, Laura, Fassan, Matteo, Chiminazzo, Valentina, Scarpa, Marco, Spolverato, Gaya, and Pucciarelli, Salvatore
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COLON cancer , *PROPORTIONAL hazards models , *LOG-rank test - Abstract
Background: Additional histologic features of T3 colon cancer, such as tumour depth invasion beyond muscularis propria and elastic lamina invasion (ELI), have taken interest for a more accurate staging. Methods: Patients with pT3 and pT4a (control group) colon adenocarcinoma were retrospectively collected from our institutional database. The study group was divided according to depth of tumour invasion < 5 mm and ≥ 5 mm, and into ELI − and ELI +. Chi-square test was used to compare the clinicopathological characteristics. OS and DFS were estimated using Kaplan–Meier method and compared with the log-rank test. Univariable and multivariable Cox proportional hazard models were employed to assess the effect on OS and DFS. Results: Out of 290 pT3 tumours, 168 (58%) had a depth of tumour invasion < 5 mm and 122 (42%) ≥ 5 mm. The 5-year OS and DFS were 85.2, 68.7 and 60.9%, and 81.4, 73.9 and 60.1% in pT3 < 5 mm, pT3 ≥ 5 mm, and pT4a respectively (p = 0.001, p = 0.072). Considering ELI − (n = 157, 54%) and ELI + (n = 133, 46%), the 5-year OS and DFS were 78.9, 76.7, and 60.9%, and 75.5, 81.5, and 60.1% in ELI − , ELI + and pT4a respectively (p = 0.955, p = 0.462). At multivariable analysis, the depth of invasion was found to be an independent predictive factor for OS (HR 2.04, 95%CI 1.28–3.24, p = 0.003) and DFS (HR 1.98, 95%CI 1.24–3.18, p = 0.004), while ELI did not result a prognostic factor for OS nor DFS. Conclusion: In pT3 colon cancer, depth of tumour invasion ≥ 5 mm is an independent risk factor for OS and DFS, whereas ELI did not result a prognostic factor affecting OS nor DFS. [ABSTRACT FROM AUTHOR]
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- 2022
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30. Sex Differences in Endurance Running.
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Besson, Thibault, Macchi, Robin, Rossi, Jeremy, Morio, Cédric Y. M., Kunimasa, Yoko, Nicol, Caroline, Vercruyssen, Fabrice, and Millet, Guillaume Y.
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RUNNING , *MYALGIA , *CONVALESCENCE , *SEX distribution , *BIOMECHANICS , *FATIGUE (Physiology) , *ELECTROMYOGRAPHY , *KINEMATICS - Abstract
In recent years, there has been a significant expansion in female participation in endurance (road and trail) running. The often reported sex differences in maximal oxygen uptake (VO2max) are not the only differences between sexes during prolonged running. The aim of this narrative review was thus to discuss sex differences in running biomechanics, economy (both in fatigue and non-fatigue conditions), substrate utilization, muscle tissue characteristics (including ultrastructural muscle damage), neuromuscular fatigue, thermoregulation and pacing strategies. Although males and females do not differ in terms of running economy or endurance (i.e. percentage VO2max sustained), sex-specificities exist in running biomechanics (e.g. females have greater non-sagittal hip and knee joint motion compared to males) that can be partly explained by anatomical (e.g. wider pelvis, larger femur-tibia angle, shorter lower limb length relative to total height in females) differences. Compared to males, females also show greater proportional area of type I fibres, are more able to use fatty acids and preserve carbohydrates during prolonged exercise, demonstrate a more even pacing strategy and less fatigue following endurance running exercise. These differences confer an advantage to females in ultra-endurance performance, but other factors (e.g. lower O2 carrying capacity, greater body fat percentage) counterbalance these potential advantages, making females outperforming males a rare exception. The present literature review also highlights the lack of sex comparison in studies investigating running biomechanics in fatigue conditions and during the recovery process. [ABSTRACT FROM AUTHOR]
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- 2022
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31. Impact of Atorvastatin on Skeletal Muscle Mitochondrial Activity, Locomotion and Axonal Excitability—Evidence from ApoE -/- Mice.
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Macchi, Chiara, Bonalume, Veronica, Greco, Maria Francesca, Mozzo, Marta, Melfi, Valentina, Sirtori, Cesare R., Magnaghi, Valerio, Corsini, Alberto, and Ruscica, Massimiliano
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ANIMAL locomotion , *ATORVASTATIN , *MUSCLE strength , *SKELETAL muscle , *MITOCHONDRIA , *ACTION potentials , *ANAEROBIC exercises , *HIGH-fat diet - Abstract
The cardiovascular benefit of statins is well established. However, only 20% of high-risk patients remain adequately adherent after 5 years of treatment. Among reasons for discontinuation, statin associated-muscle pain symptoms are the most prevalent. Aim of the present study was to evaluate the impact of high dose atorvastatin on skeletal muscle mitochondrial activity, aerobic and anaerobic exercise, and axonal excitability in a murine model of atherosclerosis. ApoE-/- mice were fed 12 weeks a high-fat high-cholesterol diet alone or containing atorvastatin (40 mg/Kg/day). Outcomes were the evaluation of muscle mitochondrial functionality, locomotion, grip test, and axonal excitability (compound action potential recording analysis of Aα motor propioceptive, Aβ mechanoceptive and C nociceptive fibres). Atorvastatin led to a reduction in muscle mitochondrial biogenesis and mitochondrial ATP production. It did not affect muscular strength but led to a time-dependent motor impairment. Atorvastatin altered the responsiveness of mechanoceptive and nociceptive fibres, respectively, the Aβ and C fibres. These findings point out to a mild sensitization on mechanical, tactile and pain sensitivity. In conclusion, although the prevalence of muscular side effects from statins may be overestimated, understanding of the underlying mechanisms can help improve the therapeutic approach and reassure adherence in patients needing-to-be-treated. [ABSTRACT FROM AUTHOR]
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- 2022
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32. Business and human rights implications of climate change litigation: Milieudefensie et al. v Royal Dutch Shell.
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Macchi, Chiara and van Zeben, Josephine
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HUMAN rights , *CLIMATE change , *CARBON dioxide mitigation , *ENVIRONMENTAL rights , *SOCIAL responsibility of business , *INTERNATIONAL environmental law - Abstract
In Milieudefensieet al.v Royal Dutch Shell, the District Court in the Hague ordered the respondent company to cut its global carbon dioxide emissions by 45 percent by 2030, as compared with 2019 levels. The landmark judgement represents the first imposition of a specific mitigation obligation on a private company over and above reduction targets set by existing 'cap‐and‐trade' regulations and/or other governmental mitigation policies. In interpreting Royal Dutch Shell's duty of care under Dutch tort law, the Court referred extensively to international soft law, including the United Nations Guiding Principles on Business and Human Rights. This note considers the implications of this case for corporate responsibility for environmental and human rights. [ABSTRACT FROM AUTHOR]
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- 2021
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33. The potential influence of photoperiod and temperature on the male reproductive physiology of the narrownose smooth hound shark, Mustelus schmitti.
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Paez, Walter L., Somoza, Gustavo M., Macchi, Gustavo J., and Elisio, Mariano
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FISH reproduction , *TERRITORIAL waters , *SPRING , *OVULATION , *PLASMA potentials - Abstract
Environmental conditions have a significant influence on the physiological processes that regulate the reproduction of fish. However, there is less information on this subject for chondrichthyans, and particularly for males. This study describes the spermatogenic cycle of the narrownose smooth hound shark Mustelus schmitti related to sex steroid plasma levels and the potential influences of photoperiod and temperature as reproductive cues. A total of 70 males were caught bi-monthly for over a year in the coastal waters of Argentina. Testicular samples were taken for histological characterization and blood samples were taken for the measurement of testosterone (T) and progesterone (P4) plasma levels from each male. Bottom temperature was recorded at each sampling point and the daily photoperiod was estimated from Julian Day Calendar. Histological assessment revealed that the complete cycle of spermatogenesis in M. schmitti lasts just over a year, with the onset of the new spermatogenic cycle (spermatocyte formation) overlapping with the end (spermiation and filling of the seminiferous ducts) of the previous cycle. This particular phase was associated with the peak in T plasma levels, which was found to be significantly explained by the increase in photoperiod in spring. The rise in temperature above 15–16 °C at the end of spring was significantly associated with a reduction in T plasma levels. Additionally, an elevation in P4 plasma levels was observed after the photoperiod increase phase. Males would be ready to mate from mid-spring, following female parturition and just before ovulation/pregnancy. [ABSTRACT FROM AUTHOR]
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- 2024
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34. X‐ray restrained extremely localized molecular orbitals for the embedding of quantum mechanical calculations.
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Macetti, Giovanni, Macchi, Piero, and Genoni, Alessandro
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MOLECULAR orbitals , *QUANTUM mechanics , *ELECTRON density , *X-rays , *MOLECULAR crystals , *EMBEDDING theorems , *ELECTRON distribution - Abstract
The X‐ray restrained wavefunction (XRW) method is a quantum crystallographic technique that allows the calculation of molecular wavefunctions adapted to minimize the difference between computed and reference structure factor amplitudes. The latter result from experimental measurements on crystals or from advanced theoretical calculations with periodic boundary conditions, and are used as external restraints in a traditional least‐squares structural refinement. Detailed investigations have shown that the technique is able to reliably capture the effects of the crystal field on the molecular electron density. In a recent application, electron distributions obtained from preliminary X‐ray restrained wavefunction calculations have been employed in the framework of frozen density embedding theory to embed excited state computations of well defined subsystems. Inspired by these results, it was decided to test, for the first time, the X‐ray restrained extremely localized molecular orbitals (XR‐ELMOs) along with the recently developed quantum mechanics/extremely localized molecular orbital multiscale embedding approach. By exploiting XR‐ELMOs obtained through XRW calculations that used structure factor amplitudes resulting from periodic ab initio computations, excited state calculations of acrylamide in an environment mimicking the one of the crystal structure were performed. In all these computations, the QM region coincides with the crystal asymmetric unit and the ELMO subsystem consisted of two other acrylamide molecules involved in direct hydrogen bonds with the reference unit. The shifts of the excitation energies with respect to the corresponding gas‐phase values were evaluated as a function of different parameters on which the computations with XR‐ELMOs depend. For instance, the dependence on the resolution of the sets of structure factors that were used to determine the embedding XR‐ELMOs were assessed in particular. The results have shown that the use of XR‐ELMOs slightly (but not negligibly) improves the description of excited states compared to the gas‐phase ELMOs. Once again, these results demonstrate the efficiency of the XRW approach in incorporating environment effects into the calculated molecular orbitals and, hence, into the corresponding electron densities. [ABSTRACT FROM AUTHOR]
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- 2021
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35. Prognostic parameters of in‐hospital mortality in COVID‐19 patients—An Italian experience.
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Ruscica, Massimiliano, Macchi, Chiara, Iodice, Simona, Tersalvi, Gregorio, Rota, Irene, Ghidini, Simone, Terranova, Leonardo, Valenti, Luca, Amati, Francesco, Aliberti, Stefano, Corsini, Alberto, Blasi, Francesco, Carugo, Stefano, Bollati, Valentina, and Vicenzi, Marco
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COVID-19 , *HOSPITAL mortality , *COVID-19 pandemic , *MORTALITY , *PHYSICIANS - Abstract
Background: During COVID‐19 outbreak, Italy was the first country in Europe to be heavily affected with an intensive care unit mortality of 26%. In order to reduce this percentage, physicians should establish clear and objective criteria to stratify COVID‐19 patients at high risk of in‐hospital death. Thus, the aim has been to test a large spectrum of variables ranging from clinical evaluation to laboratory biomarkers to identify which parameter would best predict all‐cause in‐hospital mortality in COVID‐19 patients. Design: observational study. Results: Multivariate Cox regression analysis showed that each 5 years of increase in age corresponded to a hazard ratio (HR) of 1.28 (95% CI 1.00‐1.65, P =.050); each increment of 803 ng/L of N‐terminal pro‐B‐type natriuretic peptide (NT‐proBNP) corresponded to a HR of 1.24 (95% CI 1.11‐1.39, P <.001); each increment of 58 ng/L of interleukin (IL)‐6 corresponded to a HR of 1.23 (95% CI 1.09‐1.40, P <.001), and each increment of 250 U/L of lactate dehydrogenase (LDH) corresponded to a HR of 1.23 (95% CI 1.10‐1.37, P <.001). According to the calculated cut‐points for age (≥70 years), NT‐proBNP (≥803 ng/L), IL‐6 (≥58 ng/L) and LDH (≥371 U/L) when 2 out of these 4 were overcome, the HR was 2.96 (95% CI 1.97‐4.45, P <.001). Conclusion: In COVID‐19 patients, besides age, the evaluation of three biochemical parameters, available in few hours after hospital admission can predict in‐hospital mortality regardless of other comorbidities. [ABSTRACT FROM AUTHOR]
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- 2021
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36. On the calculation of the electrostatic potential, electric field and electric field gradient from the aspherical pseudoatom model. II. Evaluation of the properties in an infinite crystal.
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Weatherly, Jessie, Macchi, Piero, and Volkov, Anatoliy
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ELECTRIC potential , *ELECTRIC fields , *ELECTROSTATIC interaction , *DIPOLE moments , *MOLECULAR crystals - Abstract
The previously reported exact potential and multipole moment (EP/MM) method for fast and precise evaluation of the intermolecular electrostatic interaction energies in molecular crystals using the pseudoatom representation of the electron density [Nguyen, Macchi & Volkov (2020), Acta Cryst. A76, 630–651] has been extended to the calculation of the electrostatic potential (ESP), electric field (EF) and electric field gradient (EFG) in an infinite crystal. The presented approach combines an efficient Ewald‐type summation (ES) of atomic multipoles up to the hexadecapolar level in direct and reciprocal spaces with corrections for (i) the net polarization of the sample (the 'surface term') due to a net dipole moment of the crystallographic unit cell (if present) and (ii) the short‐range electron‐density penetration effects. The rederived and reported closed‐form expressions for all terms in the ES algorithm have been augmented by the expressions for the surface term available in the literature [Stenhammar, Trulsson & Linse (2011), J. Chem. Phys.134, 224104] and the exact potential expressions reported in a previous study [Volkov, King, Coppens & Farrugia (2006), Acta Cryst. A62, 400–408]. The resulting algorithm, coded using Fortran in the XDPROP module of the software package XD, was tested on several small molecular crystal systems (formamide, benzene, l‐dopa, paracetamol, amino acids etc.) and compared with a series of EP/MM‐based direct‐space summations (DS) performed within a certain number of unit cells generated along both the positive and negative crystallographic directions. The EP/MM‐based ES technique allows for a noticeably more precise determination of the EF and EFG and significantly better precision of the evaluated ESP when compared with the DS calculations, even when the latter include contributions from an array of symmetry‐equivalent atoms generated within four additional unit cells along each crystallographic direction. In terms of computational performance, the ES/EP/MM method is significantly faster than the DS calculations performed within the extended unit‐cell limits but trails the DS calculations within the reduced summation ranges. Nonetheless, the described EP/MM‐based ES algorithm is superior to the direct‐space summations as it does not require the user to monitor continuously the convergence of the evaluated properties as a function of the summation limits and offers a better precision–performance balance. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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37. Leptospirosis as a cause of infertility in Uruguayan beef cattle.
- Author
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Macchi, María V., Suanes, Alejandra, Salaberry, Ximena, Dearmas, Bruno E., Rivas, Emiliano, Piaggio, José, and Gil, Andrés D.
- Subjects
- *
BEEF cattle , *BOVINE viral diarrhea virus , *LEPTOSPIROSIS , *ANIMAL herds , *HEALTH of cattle , *INFERTILITY , *DAIRY farm management , *CATTLE herding - Abstract
Leptospirosis, caused by pathogenic spirochetes of the genus Leptospira spp. , is a globally significant zoonotic disease that affects humans and animals. In cattle, leptospirosis is associated not only with overt clinical manifestations but also with reproductive diseases, including infertility. This study assesses the potential correlation between leptospirosis and infertility in Uruguayan beef cattle. A case-control study involved 31 beef herds with no prior history of Leptospira vaccination. In each herd, veterinarians identified 10 non-pregnant (cases) and 25 pregnant cows (controls) using ultrasound, and blood and urine samples were collected from each cow. Serological diagnosis was performed using the Microscopic Agglutination Test (MAT), and quantitative PCR (qPCR) was used to assess Leptospira excretion. Additionally, antibodies against bovine viral diarrhea virus (BVDV) and infectious bovine rhinotracheitis (IBR) were tested. The results demonstrated an association between seropositivity to the Sejroe serogroup (cut-off 1:200) and infertility in cattle (OR=1.31; p-value=0.06). Furthermore, the level of Leptospira excretion (qPCR) in urine was associated with increased infertility risk, with cows excreting over 100 copies per mL of urine having the highest odds of infertility (OR=2.34; p-value<0.01). This study suggests a potential association between leptospirosis and infertility in Uruguayan beef cattle, emphasizing the importance of both serological and molecular diagnostics for assessing reproductive health in cattle herds. Future research should explore the impact of Leptospira serogroups on other reproductive disorders in cattle. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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- View/download PDF
38. Impact of carbon segregation on transition carbides and cementite precipitation during tempering of low carbon steels: Experiments and modeling.
- Author
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Macchi, Juan, Teixeira, Julien, Danoix, Frédéric, Geandier, Guillaume, Denis, Sabine, Bonnet, Frédéric, and Allain, Sébastien Y.P.
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- *
TEMPERING , *MILD steel , *CEMENTITE , *PRECIPITATION (Chemistry) kinetics , *PEARLITIC steel , *CARBIDES , *DISLOCATION density - Abstract
Tempering of low-carbon steels (less than about 0.3 wt.% C) may differ from the traditional precipitation sequence, which includes transition carbide precipitation, retained austenite decomposition and cementite precipitation. The main difference is the partial or total absence of transition carbides. In the present work, the effect of the carbon segregation on the mitigation of the precipitation of the latter is analyzed by combining multi-scale experimental investigations with a new precipitation model accounting for the carbon heterogeneities induced by the segregation. The full precipitation sequence is considered in order to study the impact of the segregation not only on the transition carbides, but also on the cementite which forms afterwards. The experimental work includes APT characterization of carbon segregation, in-situ HEXRD experiments to reveal precipitation kinetics, and TEM observations for carbide size measurements. The here-in developed precipitation mean-field and physics-based model combines two previous ones dedicated to the nucleation and growth of transition carbides and cementite and to the segregation of carbon at dislocations. It is shown that, even after water-quench, carbon atoms are already segregated on dislocations. The mitigation of transition carbide precipitation is caused by the presence of such segregations, which decrease the driving force for the transition carbide nucleation and enhance cementite precipitation. In agreement with previous experiments, the model also demonstrates that inside a martensitic microstructure, the precipitation sequence is different between the first (formed close to Ms temperature) and the last martensite (formed at room temperature) formed upon cooling, because of the difference in dislocation density, which influences the intensity of the segregation phenomenon. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2024
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39. Lessons from the COVID-19 pandemic for improving outpatient neuropalliative care: A qualitative study of patient and caregiver perspectives.
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Macchi, Zachary A, Ayele, Roman, Dini, Megan, Lamira, Jensine, Katz, Maya, Pantilat, Steven Z, Jones, Jacqueline, and Kluger, Benzi M
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- *
CAREGIVER attitudes , *HUMAN research subjects , *ALZHEIMER'S disease , *RESEARCH methodology , *MEDICAL care , *INTERVIEWING , *BURDEN of care , *PATIENTS' attitudes , *QUALITATIVE research , *SURVEYS , *DOCUMENTATION , *INFORMED consent (Medical law) , *QUALITY assurance , *MEDICAL records , *COMMUNICATION , *PARKINSON'S disease , *QUALITY of life , *RESEARCH funding , *THEMATIC analysis , *COVID-19 pandemic , *PALLIATIVE treatment , *OUTPATIENT services in hospitals , *NEURODEGENERATION - Abstract
Background: COVID-19 has impacted persons with serious illness, including those with chronic, neurodegenerative conditions. While there are several reports on COVID-19's impact on inpatient palliative care, literature is limited about the impact on outpatient care which may be more relevant for these patients. Aim: To generate a person-centered description of the impact of COVID-19 from the perspectives of patients living with neurodegenerative disease and caregivers to improve outpatient palliative care delivery. Design: This qualitative study used rapid analysis via matrix design to identify emergent themes related to participant perspectives on the challenges of COVID-19. Data sources included semi-structured interviews, open-ended survey responses, medical record documentation and participant-researcher communications. Setting/Participants: Data was collected from 108 patients with Parkinson's disease, Alzheimer's disease or related disorders and 90 caregivers enrolled in a multicenter, clinical trial of community-based, outpatient palliative care between March 20, 2020 and August 8, 2020 (NCT03076671). Results: Four main themes emerged: (1) disruptions to delivery of healthcare and other supportive services; (2) increased symptomatic and psychosocial needs; (3) increased caregiver burden; (4) limitations of telecommunications when compared to in-person contact. We observed that these themes interacted and intersected. Conclusions: Patients and caregivers have unmet care needs because of the pandemic, exacerbated by social isolation. While telemedicine has helped improve access to healthcare, patients and caregivers perceive clear limitations compared to in-person services. Changes in society and healthcare delivery in response to COVID-19 highlight ongoing and novel gaps that must be addressed to optimize future outpatient palliative care for neurologic illness. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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40. Psychiatric Comorbidities in Functional Movement Disorders: A Retrospective Cohort Study.
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Macchi, Zachary A., Kletenik, Isaiah, Olvera, Caroline, and Holden, Samantha K.
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MOVEMENT disorders , *COHORT analysis , *MENTAL illness , *COMORBIDITY , *DIAGNOSIS , *SYMPTOMS , *PSYCHIATRIC emergencies - Abstract
Background: Functional movement disorders (FMD) are characterized by abnormal movements and motor symptoms incongruent with a known structural neurologic cause. While psychological stressors have long been considered an important risk factor for developing FMD, little is known about the impact of psychiatric comorbidities on disease manifestations or complexity. Objectives: To compare characteristics of FMD patients with co‐occurring mood and trauma‐related psychiatric conditions to FMD patients without psychiatric conditions. Methods: We performed a retrospective cohort study of patients seen in the University of Colorado Health system between January 1, 2015 and December 31, 2019. Patients were included if they had a diagnosis of FMD, determined by ICD‐10 coding and ≥1 phenomenology‐related diagnostic code (tremor, gait disturbances, ataxia, spasms, and weakness), and at least one encounter with a neurology specialist. Fisher's exact and unpaired t‐tests were used to compare demographics, healthcare utilization, and phenomenologies of patients with psychiatric conditions to those with none. Results: Our review identified 551 patients with a diagnosis of FMD who met inclusion criteria. Patients with psychiatric conditions (N = 417, 75.7%) had increased five‐year healthcare utilization (mean emergency room encounters 9.9 vs. 3.5, P = 0.0001) and more prevalent non‐epileptic seizures (18.2% vs. 7.5%, P = 0.001). Suicidal ideation (8.4%) and self‐harm (4.1%) were only observed amongst patients with comorbid psychiatric conditions. Conclusions: Patients with FMD and comorbid psychiatric conditions require more healthcare resources and have greater disease complexity than patients without psychiatric illness. This may have implications for treatment of patients without comorbid psychiatric conditions who may benefit from targeted physiotherapy alone. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
41. Numbers do not add up! The pragmatic approach to the framing of medical treatments.
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Macchi, Laura and Zulato, Edoardo
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- *
PRAGMATICS , *THERAPEUTICS , *PSYCHOLOGICAL literature , *RISK-taking behavior , *DECISION making - Abstract
The risky choice framing effect disclosed that presenting data in a loss scenario lead decision-makers towards risky choices. Conversely, a gain scenario prevents themfrom taking a risk. Framing effect robustness has been widely confirmed by psychological literature. However, the framing of medical treatments, based on McNeil et al. (1982) paradigm, raised both methodological doubts and contrasting evidence. Our research aimed to investigate the presence and the nature of the framing effect in the McNeil et al. (1982) paradigm. In particular, we thought that the obtained switch of preferences across frames was due to a misleading formulation of the data given in a negative cumulative frequency format. We conducted three studies: (1) we replicated McNeil et al.'s (1982) original study (N=150) with medicine (n=50), statistics (n=50) and lay (n=50) students; (2) we tested (N=180) our hypothesis by comparing a cumulative frequency format with an alternative version, namely a linear progression one; (3) we compared (N=430) the effect of different formats (cumulative frequency, linear progression and interval frequency) on choices. Our results showed that, while the framing effect is present when employing a cumulative frequency format, it disappears when using a linear progression one. Moreover, our results show that decision-makers better understand information when given in a linear progression and an interval frequency format. In the current paper, we argue that the way in which a problem is formulated plays a relevant role in the representation of the decisional task and the decision-making. Keywords: medical framing effect, reverse pattern of choice, understanding numerical information, pragmatic approach. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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42. Potential risk factors for Varicella‐zoster virus reactivation after COVID‐19 vaccination.
- Author
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May Lee, Marco, Macchi, Stefano, Mora, Edoardo, and Feliciani, Claudio
- Subjects
- *
VARICELLA-zoster virus , *COVID-19 vaccines , *HERPES zoster , *VIRUS reactivation , *HERPES zoster vaccines , *CHICKENPOX , *MEDICAL personnel - Abstract
Keywords: COVID-19 vaccine; herpes zoster reactivation; Varicella-zoster virus EN COVID-19 vaccine herpes zoster reactivation Varicella-zoster virus 1347 1349 3 04/06/22 20220401 NES 220401 ACKNOWLEDGMENT None. 30 Fukuoka H, Fukuoka N, Kibe T, Tubbs RS, Iwanaga J. Oral Herpes Zoster infection following COVID-19 vaccination: a report of five cases. Herpes zoster after COVID-19 vaccination-Can the vaccine reactivate latent zoster virus? A narrative review and clinical anatomy of herpes zoster infection following COVID-19 vaccination. [Extracted from the article]
- Published
- 2022
- Full Text
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43. With trade comes responsibility: the external reach of the EU's fundamental rights obligations.
- Author
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Macchi, Chiara
- Subjects
- *
CIVIL rights , *COMMERCIAL policy , *RESPONSIBILITY , *COMMERCIAL treaties , *HUMAN rights - Abstract
Based on International Human Rights Law and EU law, this article endorses a 'functional' paradigm of EU's fundamental rights obligations, exploring whether such obligations extend beyond the EU's external borders and which positive obligations, if any, they entail. The article argues that the EU's fundamental rights obligations are founded in a non-territorial standard, as they attach to all 'functions' exercised by EU institutions, regardless of their internal or external scope. The paper then addresses the implications of such paradigm for the EU's human rights obligations in the context of its Common Commercial Policy, focusing in particular on trade agreements, investment protection agreements and on the EU's duty to regulate corporate actors. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
44. Fast analytical evaluation of intermolecular electrostatic interaction energies using the pseudoatom representation of the electron density. III. Application to crystal structures via the Ewald and direct summation methods.
- Author
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Nguyen, Daniel, Macchi, Piero, and Volkov, Anatoliy
- Subjects
- *
ELECTRON density , *ENERGY consumption , *CRYSTAL structure , *INTERMOLECULAR interactions , *MOLECULAR magnetic moments , *ELECTROSTATIC interaction - Abstract
The previously reported exact potential and multipole moment (EP/MM) method for fast and accurate evaluation of the intermolecular electrostatic interaction energies using the pseudoatom representation of the electron density [Volkov, Koritsanszky & Coppens (2004). Chem. Phys. Lett.391, 170–175; Nguyen, Kisiel & Volkov (2018). Acta Cryst. A74, 524–536; Nguyen & Volkov (2019). Acta Cryst. A75, 448–464] is extended to the calculation of electrostatic interaction energies in molecular crystals using two newly developed implementations: (i) the Ewald summation (ES), which includes interactions up to the hexadecapolar level and the EP correction to account for short‐range electron‐density penetration effects, and (ii) the enhanced EP/MM‐based direct summation (DS), which at sufficiently large intermolecular separations replaces the atomic multipole moment approximation to the electrostatic energy with that based on the molecular multipole moments. As in the previous study [Nguyen, Kisiel & Volkov (2018). Acta Cryst. A74, 524–536], the EP electron repulsion integral is evaluated analytically using the Löwdin α‐function approach. The resulting techniques, incorporated in the XDPROP module of the software package XD2016, have been tested on several small‐molecule crystal systems (benzene, l‐dopa, paracetamol, amino acids etc.) and the crystal structure of a 181‐atom decapeptide molecule (Z = 4) using electron densities constructed via the University at Buffalo Aspherical Pseudoatom Databank [Volkov, Li, Koritsanszky & Coppens (2004). J. Phys. Chem. A, 108, 4283–4300]. Using a 2015 2.8 GHz Intel Xeon E3‐1505M v5 computer processor, a 64‐bit implementation of the Löwdin α‐function and one of the higher optimization levels in the GNU Fortran compiler, the ES method evaluates the electrostatic interaction energy with a numerical precision of at least 10−5 kJ mol−1 in under 6 s for any of the tested small‐molecule crystal structures, and in 48.5 s for the decapeptide structure. The DS approach is competitive in terms of precision and speed with the ES technique only for crystal structures of small molecules that do not carry a large molecular dipole moment. The electron‐density penetration effects, correctly accounted for by the two described methods, contribute 28–64% to the total electrostatic interaction energy in the examined systems, and thus cannot be neglected. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
45. Trade‐offs between biodiversity and agriculture are moving targets in dynamic landscapes.
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Macchi, Leandro, Decarre, Julieta, Goijman, Andrea P., Mastrangelo, Matías, Blendinger, Pedro G., Gavier‐Pizarro, Gregorio I., Murray, Francisco, Piquer‐Rodriguez, María, Semper‐Pascual, Asunción, Kuemmerle, Tobias, and Peralta, Guadalupe
- Subjects
- *
BIODIVERSITY , *BIRD communities , *TROPICAL dry forests , *LANDSCAPE changes , *BIRD populations , *AGRICULTURE - Abstract
Understanding how biodiversity responds to intensifying agriculture is critical to mitigating the trade‐offs between them. These trade‐offs are particularly strong in tropical and subtropical deforestation frontiers, yet it remains unclear how changing landscape context in such frontiers alters agriculture–biodiversity trade–offs.We focus on the Argentinean Chaco, a global deforestation hotspot, to explore how landscape context shapes trade‐off curves between agricultural intensity and avian biodiversity. We use a space‐for‐time approach and integrate a large field dataset of bird communities (197 species, 234 survey plots), three agricultural intensity metrics (meat yield, energy yield and profit) and a range of environmental covariates in a hierarchical Bayesian occupancy framework.Woodland extent in the landscape consistently determines how individual bird species, and the bird community as a whole, respond to agricultural intensity. Many species switch in their fundamental response, from decreasing occupancy with increased agricultural intensity when woodland extent in the landscape is low (loser species), to increasing occupancy with increased agricultural intensity when woodland extent is high (winner species).This suggests that landscape context strongly mediates who wins and loses along agricultural intensity gradients. Likewise, where landscapes change, such as in deforestation frontiers, the very nature of the agriculture–biodiversity trade–offs can change as landscapes transformation progresses.Synthesis and applications. Schemes to mitigate agriculture–biodiversity trade–offs, such as land sparing or sharing, must consider landscape context. Strategies that are identified based on a snapshot of data risk failure in dynamic landscapes, particularly where agricultural expansion continues to reduce natural habitats. Rather than a single, fixed strategy, adaptive management of agriculture–biodiversity trade–offs is needed in such situations. Here we provide a toolset for considering changing landscape contexts when exploring such trade‐offs. This can help to better align agriculture and biodiversity in tropical and subtropical deforestation frontiers. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
46. The connubium between crystallography and quantum mechanics.
- Author
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Macchi, Piero
- Subjects
- *
COMPUTATIONAL physics , *SCIENTIFIC literature , *CRYSTALLOGRAPHY , *CRYSTAL morphology , *CRYSTAL growth - Abstract
By rephrasing the incipit of one of the most influential books: a spectre is haunting science, the spectre of quantum crystallography. This name is ever more frequent in the scientific literature and very appealing. Though, what does it reflect? Both crystallography and quantum mechanics are branches of science, although perceived in an inappropriate way: crystallography is often a synonymous for X-ray diffraction whereas quantum mechanics is intended as computational physics or chemistry. Both diffraction and computation are not sciences, but techniques. Establishing the quantum mechanical paradigm was one of the most important scientific revolutions, which changed the perspective of physics and unveiled the nature of small particles. Instead, crystallography is an old science, anciently started when the search for naturally grown materials was vital. The curiosity for crystal morphologies and growth led to more in-depth descriptive analyses and classifications of minerals. Contemporarily, the mathematical description of periodic structures developed. Everything changed abruptly when X-rays were discovered, offering a new light to look inside crystals and unveil their content at an atomic resolution, and even beyond, where quantum mechanics dominates. The purpose of this review is to illustrate how profound and long standing is the entanglement between the two sciences. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
47. Age-Related Differences in Sensitivity to Facial Trustworthiness: Perceptual Representation and the Role of Emotional Development.
- Author
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Baccolo, Elisa and Macchi Cassia, Viola
- Subjects
- *
AGE differences , *TRUST , *FACE , *EMOTIONS , *EMOTIONAL competence , *CHILD development , *RESEARCH , *JUDGMENT (Psychology) , *AGE distribution , *RESEARCH methodology , *FACIAL expression , *SENSORY perception , *MEDICAL cooperation , *EVALUATION research , *COMPARATIVE studies , *SOCIAL skills - Abstract
The ability to discriminate social signals from faces is a fundamental component of human social interactions whose developmental origins are still debated. In this study, 5-year-old (N = 29) and 7-year-old children (N = 31) and adults (N = 34) made perceptual similarity and trustworthiness judgments on a set of female faces varying in level of expressed trustworthiness. All groups represented perceived similarity of the faces as a function of trustworthiness intensity, but such representation becomes more fine-grained with development. Moreover, 5-year-olds' accuracy in choosing the more trustworthy face in a pair varied as a function of children's score at the Test of Emotion Comprehension, suggesting that the ability to perform face-to-trait inferences is related to the development of emotional understanding. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
48. ENSEÑANDO AMÉRICA A LOS JÓVENES: JOACHIM CAMPE, JUAN CORRADI Y EL DESCUBRIMIENTO Y CONQUISTA DE LA AMÉRICA DE 1803.
- Author
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MACCHI, FERNANDA
- Subjects
- *
NINETEENTH century , *ESSAYS , *TRANSLATIONS , *DISCOURSE , *INDEPENDENT films - Abstract
This essay studies an early expression of the pedagogical discourse about the first century of the history of America in its relation to Europe. Through the analysis of the first translation into Spanish of the Descubrimiento y conquista de América by Joachim Campe (1782), by Juan Corradi, printed by the Royal Printing House, in Madrid in 1803, the essay articulates an evaluation of the readings of Chronicles of Indies during the beginning of the 19th century, contrasting its reception and use in and out Spain. [ABSTRACT FROM AUTHOR]
- Published
- 2020
49. Plasma waves in a different frame.
- Author
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Macchi, A.
- Subjects
- *
PLASMA waves , *PLASMA oscillations , *PLASMA physics , *PLASMA acceleration , *ORDINARY differential equations , *RELATIVISTIC plasmas , *PARTICLE acceleration - Abstract
A tutorial description of plasma waves in a cold plasma, with emphasis on their application in plasma-based electron accelerators, is presented. The basic physics of linear plasma oscillations and waves and the principle of electron acceleration in a plasma wave are discussed without assuming any previous knowledge of plasma physics. It is shown that estimating key parameters for plasma acceleration such as the maximum or "wave breaking" amplitude and the corresponding energy gained by electrons "surfing" the wave requires a relativistic and nonlinear analysis. This can be done with little mathematical complexity by using a Lorentz transformation to a frame co-moving at the phase velocity of the wave. The transformation reduces the problem to a secondorder ordinary differential equation as originally found by Chian [Plasma Phys. 21, 509 (1979)] so that the analysis can exploit the analogy with the mechanical motion of a particle in a potential well. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
50. Unraveling the Epigenetic Basis of Liver Development, Regeneration and Disease.
- Author
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Macchi, Filippo and Sadler, Kirsten C.
- Abstract
A wealth of studies over several decades has revealed an epigenetic prepattern that determines the competence of cellular differentiation in the developing liver. More recently, studies focused on the impact of epigenetic factors during liver regeneration suggest that an epigenetic code in the quiescent liver may establish its regenerative potential. We review work on the pioneer factors and other chromatin remodelers that impact the gene expression patterns instructing hepatocyte and biliary cell specification and differentiation, along with the requirement of epigenetic regulatory factors for hepatic outgrowth. We then explore recent studies involving the role of epigenetic regulators, Arid1a and Uhrf1, in efficient activation of proregenerative genes during liver regeneration, thus highlighting the epigenetic mechanisms of liver disease and tumor development. An epigenetic prepattern governs fate decisions and differentiation potential during liver development. Liver regeneration is accompanied by a coordinated set of gene expression changes, which could be regulated by an epigenetic pattern in quiescent hepatocytes, thereby governing regenerative potential. Recent studies suggest that broad changes to the epigenetic landscape during liver regeneration control the expression of genes driving regeneration and the ones dictating hepatic fate. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
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