15,790 results match your criteria: "Universite Paris Sud[Affiliation]"

Bottom-up growth offers precise control over the structure and geometry of semiconductor nanowires (NWs), enabling a wide range of possible shapes and seamless heterostructures for applications in nanophotonics and electronics. The most common vapor-liquid-solid (VLS) growth method features a complex interaction between the liquid metal catalyst droplet and the anisotropic structure of the crystalline NW, and the growth is mainly orchestrated by the triple-phase line (TPL). Despite the intrinsic mismatch between the droplet and the NW symmetries, its discussion has been largely avoided because of its complexity, which has led to the situation when multiple observed phenomena such as NW axial asymmetry or the oscillating truncation at the TPL still lack detailed explanation.

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Intrahepatic cholangiocarcinoma (iCCA) is a highly heterogeneous and aggressive liver cancer with limited therapeutic options. Precise classification and immunotherapy are perspectives to improve the treatments. We reported the role of septin 9 in apico-basal polarity and epithelial-to-mesenchymal transition (EMT).

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Factors influencing the implementation of parent-mediated intervention are insufficiently studied. This study examines for the first-time factors of implementation into clinical practice across the world of Pediatric Autism Communication Therapy, an internationally disseminated, evidence-based, parent-mediated therapy. From both the parents' and the professionals' perspectives, parents attitudes (e.

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The Orange Carotenoid Protein Triggers Cyanobacterial Photoprotection by Quenching Bilins via a Structural Switch of Its Carotenoid.

J Am Chem Soc

August 2024

Department of Physics and Astronomy and Institute for Lasers, Life and Biophotonics, Faculty of Science, Vrije Universiteit Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.

Cyanobacteria were the first microorganisms that released oxygen into the atmosphere billions of years ago. To do it safely under intense sunlight, they developed strategies that prevent photooxidation in the photosynthetic membrane, by regulating the light-harvesting activity of their antenna complexes-the phycobilisomes-via the orange-carotenoid protein (OCP). This water-soluble protein interacts with the phycobilisomes and triggers nonphotochemical quenching (NPQ), a mechanism that safely dissipates overexcitation in the membrane.

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Genotoxic stress impacts pre-mRNA 3'-end processing.

Bioessays

September 2024

Institut Curie, CNRS UMR 3348, PSL Research University, Orsay, France.

Genotoxic stress, arising from various environmental sources and endogenous cellular processes, pose a constant threat to genomic stability. Cells have evolved intricate mechanisms to detect and repair DNA damage, orchestrating a robust genotoxic stress response to safeguard the integrity of the genome. Recent research has shed light on the crucial role of co- and post-transcriptional regulatory mechanisms in modulating the cellular response to genotoxic stress.

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The coronavirus disease 2019 (COVID-19) pandemic and respective shutdowns dramatically altered human activities, potentially changing human pressures on urban-dwelling animals. Here, we use such COVID-19-induced variation in human presence to evaluate, across multiple temporal scales, how urban birds from five countries changed their tolerance towards humans, measured as escape distance. We collected 6369 escape responses for 147 species and found that human numbers in parks at a given hour, day, week or year (before and during shutdowns) had a little effect on birds' escape distances.

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Sulfur-Promoted Access to 3-Arylquinoxalin-2-ones by Oxidative Coupling of -Phenylenediamines with Arylacetates.

Org Lett

July 2024

Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Université Paris-Sud, Université Paris-Saclay, 1 av de la Terrasse, 91198 Gif-sur-Yvette, France.

We disclose the synthesis of 3-arylquinoxalin-2-ones from -phenylenediamines and readily available arylacetates. The method harnesses the selective oxidative property of elemental sulfur in the presence of amine base catalyst and DMSO. The reactions are operationally simple and tolerate a wide range of functional groups.

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In recent years, the exploration of genome three-dimensional (3D) conformation has yielded profound insights into the regulation of gene expression and cellular functions in both animals and plants. While animals exhibit a characteristic genome topology defined by topologically associating domains (TADs), plants display similar features with a more diverse conformation across species. Employing advanced high-throughput sequencing and microscopy techniques, we investigated the landscape of 26 histone modifications and RNA polymerase II distribution in tomato ().

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Background: pathogenic variants (PV) have been recently identified as the most frequent variants predisposing to Sonic Hedgehog (SHH) medulloblastomas (MB); however, guidelines are still lacking for genetic counseling in this new syndrome.

Methods: We retrospectively reviewed clinical and genetic data of a French series of 29 -mutated MB.

Results: All patients developed SHH-MB, with a biallelic inactivation of found in 24 tumors.

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Initial laparoscopic liver resection is associated with reduced adhesions and transfusions at the time of salvage liver transplantation.

HPB (Oxford)

September 2024

Department of Hepatobiliary Surgery and Liver Transplantation, Sorbonne University, Hôpital Pitié-Salpêtrière, Assistance Publique- Hôpitaux de Paris, France. Electronic address:

Background: Laparoscopic liver resection (LLR) has been associated with improved patient recovery as well as reduced postoperative adhesions compared to open LR (OLR) and could therefore facilitate redo liver surgery. LLR prior to liver transplantation (LT) is increasingly performed, LT being saved for HCC recurrence. LT is still performed by open surgery due to vascular reconstructions and underlying liver chronic disease.

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Active particle in one dimension subjected to resetting with memory.

Phys Rev E

May 2024

LPTMS, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay, France.

The study of diffusion with preferential returns to places visited in the past has attracted increased attention in recent years. In these highly non-Markov processes, a standard diffusive particle intermittently resets at a given rate to previously visited positions. At each reset, a position to be revisited is randomly chosen with a probability proportional to the accumulated amount of time spent by the particle at that position.

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Reactions of wintering passerines to male calls of the European cuckoo Cuculus canorus.

Sci Rep

June 2024

Ecologie Systématique Evolution, Université Paris-Sud, CNRS, Université Paris-Saclay, 91405, Orsay Cedex, AgroParisTech, France.

The reaction of birds to the nest parasite, the European cuckoo Cuculus canorus, has been the subject of extensive testing in various aspects. However, while the cuckoo is a long-distance migrant, some of its hosts are sedentary species. In this study, we aimed to investigate whether species, primarily hosts, react to the presence of the cuckoo also in the winter season.

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Frailty assessment in critically ill older adults: a narrative review.

Ann Intensive Care

June 2024

Department of Geriatrics, Hopital Saint-Antoine, Assistance Publique Hôpitaux de Paris (AP-HP), Sorbonne Université, 75012, Paris, France.

Frailty, a condition that was first defined 20 years ago, is now assessed via multiple different tools. The Frailty Phenotype was initially used to identify a population of "pre-frail" and "frail" older adults, so as to prevent falls, loss of mobility, and hospitalizations. A different definition of frailty, via the Clinical Frailty Scale, is now actively used in critical care situations to evaluate over 65 year-old patients, whether it be for Intensive Care Unit (ICU) admissions, limitation of life-sustaining treatments or prognostication.

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Reconstructing the Global Migration History of Toward Colombia.

Phytopathology

September 2024

Department of Biological Sciences, Universidad de los Andes, Bogotá 111711, Colombia.

The evolution of new variants of plant pathogens is one of the biggest challenges to controlling and managing plant diseases. Of the forces driving these evolutionary processes, global migration events are particularly important for widely distributed diseases such as potato late blight, caused by the oomycete . However, little is known about its migration routes outside North America and Europe.

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Introduction: Lung cancer is the most common cancer worldwide in mortality and the second in incidence. Epidemiological studies found a higher lung cancer risk for smoking women in comparison to men, but these sex differences, irrespective of smoking habits, remain controversial. One of the hypotheses concerns the genetic contribution of the sex chromosomes.

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Development of the cerebellum requires precise regulation of granule neuron progenitor (GNP) proliferation. Although it is known that primary cilia are necessary to support GNP proliferation, the exact molecular mechanism governing primary cilia dynamics within GNPs remains elusive. Here, we establish the pivotal roles for the centrosomal kinase TTBK2 (Tau tubulin kinase-2) and the E3 ubiquitin ligase HUWE1 in GNP proliferation.

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Introduction: The Morel-Lavallee lesion (MLL) is a closed, degloving soft-tissue injury, wherein the skin and subcutaneous tissue are separated from the underlying fascia. This syndrome causes disruption of wound healing. Infrared thermography is a noninvasive and pain-free tool that can be used to evaluate scar and the influence of osteopathic manipulative treatment.

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Reply to the Letter to the Editor regarding 'Overcoming Barriers in Biomarker Testing' J. García-Foncillas et al.

Ann Oncol

September 2024

Bureau Biostatistique et Epidémiologie, Gustave Roussy, Université Paris-Saclay, Villejuif; INSERM, Université Paris-Saclay, CESP U1018 Oncostat, Labelisé Ligue Contre le Cancer, Villejuif, France.

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Article Synopsis
  • Atezolizumab was assessed for its safety in a diverse group of patients with pretreated urinary tract carcinoma (UTC) in the SAUL study, which included those typically excluded from clinical trials.
  • The study involved 1004 patients and found that 68 patients continued treatment for over 4 years, with 16% experiencing serious treatment-related adverse events.
  • Long-term results show a median overall survival of 8.6 months, with 14% of patients surviving more than 4 years, indicating the drug's potential benefits in real-world settings with complex patient profiles.
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Background: The safety profile of adjuvant pembrolizumab was evaluated in a pooled analysis of 4 phase 3 clinical trials.

Methods: Patients had completely resected stage IIIA, IIIB, or IIIC melanoma per American Joint Committee on Cancer, 7th edition, criteria (AJCC-7; KEYNOTE-054); stage IIB or IIC melanoma per AJCC-8 (KEYNOTE-716); stage IB, II, or IIIA non-small cell lung cancer per AJCC-7 (PEARLS/KEYNOTE-091); or postnephrectomy/metastasectomy clear cell renal cell carcinoma at increased risk of recurrence (KEYNOTE-564). Patients received adjuvant pembrolizumab 200 mg (2 mg/kg up to 200 mg for pediatric patients) or placebo every 3 weeks for approximately 1 year.

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Article Synopsis
  • Vinculin is a protein that helps cells stick together, and the IpaA invasion effector enhances its activity by promoting a unique protein structure called supra-activation, which aids in cell adhesion.
  • The study focused on specific mutations in vinculin's subdomains that interact with IpaA, revealing that these mutations influenced the formation of vinculin trimers and how quickly monomers disappeared.
  • Results showed that certain mutations decreased the ability of cells to be invaded, indicating that IpaA's role is more about enhancing cell-matrix adhesion rather than facilitating bacterial invasion, as confirmed by experiments on shear stress effects.
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Article Synopsis
  • Normal cells regulate growth and maturation through precise gene expression changes influenced by the epigenome, but the epigenetic shifts during cancer progression are not well-understood.
  • This study focuses on medulloblastoma, an embryonal brain tumor, and reveals key epigenomic changes that differentiate precancerous cells from malignant ones.
  • It identifies the nuclear factor I (NFIB) transcription factor as a significant player in cancer development, showing that inhibiting NFIB can disrupt the cancer-specific epigenome, highlighting the role of non-mutational mechanisms in tumorigenesis.
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