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result(s) for
"Barbosa, Nicolás Daniel"
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Bayesian full-waveform inversion of tube waves to estimate fracture aperture and compliance
2020
The hydraulic and mechanical characterization of fractures is crucial for a wide range of pertinent applications, such as geothermal energy production, hydrocarbon exploration, CO2 sequestration, and nuclear waste disposal. Direct hydraulic and mechanical testing of individual fractures along boreholes does, however, tend to be slow and cumbersome. To alleviate this problem, we propose to estimate the effective hydraulic aperture and the mechanical compliance of isolated fractures intersecting a borehole through a Bayesian Markov chain Monte Carlo (MCMC) inversion of full-waveform tube-wave data recorded in a vertical seismic profiling (VSP) setting. The solution of the corresponding forward problem is based on a recently developed semi-analytical solution. This inversion approach has been tested for and verified on a wide range of synthetic scenarios. Here, we present the results of its application to observed hydrophone VSP data acquired along a borehole in the underground Grimsel Test Site in the central Swiss Alps. While the results are consistent with the corresponding evidence from televiewer data and exemplarily illustrate the advantages of using a computationally expensive stochastic, instead of a deterministic inversion approach, they also reveal the inherent limitation of the underlying semi-analytical forward solver.
Journal Article
Effects of Trichoderma harzianum and Bacillus subtilis on the root and soil microbiomes of the soybean plant INTACTA RR2 PRO
by
de Andrade, Luana Alves
,
Santos, Carlos Henrique Barbosa
,
Mondin, Mateus
in
Abiotic stress
,
Bacillus subtilis
,
Community composition
2024
Soybean is a significant export product for several countries, including the United States and Brazil. There are numerous varieties of soybean. Among them, a genetically modified type known as INTACTA RR2 PRO™ has been designed to demonstrate resistance to glyphosate and to produce toxins that are lethal to several species of caterpillars. Limited information is available on the use of
and
to promote plant growth and their impact on the plant microbiome.
This study aimed to evaluate the effects of these microorganisms on this soybean cultivar by analyzing parameters, such as root and shoot dry matter, nutritional status, and root and soil microbial diversity.
The results indicated that treatments with
alone or in combination with
as seed or seed and soil applications significantly enhanced plant height and biomass compared to the other treatments and the control. No significant differences in phosphorus and nitrogen concentrations were detected across treatments, although some treatments showed close correlations with these nutrients. Microbial inoculations slightly influenced the soil and root microbiomes, with significant beta diversity differences between soil and root environments, but had a limited overall impact on community composition.
The combined application of
and
particularly enhanced plant growth and promoted plant-associated microbial groups, such as Rhizobiaceae, optimizing plant-microbe interactions. Furthermore, the treatments resulted in a slight reduction in fungal richness and diversity.
Journal Article
Direct and selective pharmacological disruption of the YAP–TEAD interface by IAG933 inhibits Hippo-dependent and RAS–MAPK-altered cancers
by
Chapeau, Emilie A.
,
Sansregret, Laurent
,
Faris, Jason E.
in
Adaptor Proteins, Signal Transducing - metabolism
,
Animals
,
Antineoplastic Agents - pharmacology
2024
The YAP–TEAD protein–protein interaction mediates YAP oncogenic functions downstream of the Hippo pathway. To date, available YAP–TEAD pharmacologic agents bind into the lipid pocket of TEAD, targeting the interaction indirectly via allosteric changes. However, the consequences of a direct pharmacological disruption of the interface between YAP and TEADs remain largely unexplored. Here, we present IAG933 and its analogs as potent first-in-class and selective disruptors of the YAP–TEAD protein–protein interaction with suitable properties to enter clinical trials. Pharmacologic abrogation of the interaction with all four TEAD paralogs resulted in YAP eviction from chromatin and reduced Hippo-mediated transcription and induction of cell death. In vivo, deep tumor regression was observed in Hippo-driven mesothelioma xenografts at tolerated doses in animal models as well as in Hippo-altered cancer models outside mesothelioma. Importantly this also extended to larger tumor indications, such as lung, pancreatic and colorectal cancer, in combination with RTK, KRAS-mutant selective and MAPK inhibitors, leading to more efficacious and durable responses. Clinical evaluation of IAG933 is underway.
Journal Article
Development of supramolecular anticoagulants with on-demand reversibility
by
Dowman, Luke J.
,
Dockerill, Millicent
,
Winssinger, Nicolas
in
631/92/436/2388
,
639/638/541/962
,
Agriculture
2025
Drugs are administered at a dosing schedule set by their therapeutic index, and termination of action is achieved by clearance and metabolism of the drug. In some cases, such as anticoagulant drugs or immunotherapeutics, it is important to be able to quickly reverse the drug’s action. Here, we report a general strategy to achieve on-demand reversibility by designing a supramolecular drug (a noncovalent assembly of two cooperatively interacting drug fragments held together by transient hybridization of peptide nucleic acid (PNA)) that can be reversed with a PNA antidote that outcompetes the hybridization between the fragments. We demonstrate the approach with thrombin-inhibiting anticoagulants, creating very potent and reversible bivalent direct thrombin inhibitors (
K
i
= 74 pM). The supramolecular inhibitor effectively inhibited thrombus formation in mice in a needle injury thrombosis model, and this activity could be reversed by administration of the PNA antidote. This design is applicable to therapeutic targets where two binding sites can be identified.
A supramolecular drug design yields anticoagulants that are rapidly reversible.
Journal Article
Growth promotion and modulation of the soybean microbiome INTACTA RR PRO with the application of the fungi Trichoderma harzianum and Purpureocillum lilacinum
by
Santos, Carlos Henrique Barbosa
,
Rigobelo, Everlon Cid
,
Desoignies, Nicolas
in
631/326
,
631/337
,
704/844
2024
Soybean is an economically important crop for animal and human nutrition. Currently, there is a lack of information on the effects of
Trichoderma harzianum
and
Purpureocillum lilacinum
on INTACTA RR PRO transgenic soybean plants. The present study evaluated the application of
T. harzianum
and
P. lilacinum
under field conditions. The results revealed a significant increase in soybean yield at 423 kg ha
−1
in response to the application of
P. lilacinum
compared with the control treatment. In addition, the application of
P. lilacinum
promoted a significant increase in phosphorus levels in the plant leaves, and there were significant correlations between the increase in taxon abundance for the genus
Erwinia
and productivity and the average phosphorus and nitrogen content for the plant leaves, for the taxon
Bacillus
and nitrogen content and productivity, and for the taxon
Sphingomonas
and nitrogen content. The
Bradyrhizobium
taxon was identified in the
P. lilacinum
treatment as a taxon linking two different networks of taxa and is an important taxon in the microbiota. The results show that the application of the fungus
P. lilacinum
can increase the productivity of soybean INTACTA RR PRO and that this increase in productivity may be a function of the modulation of the microbiota composition of the plant leaves by the
P. lilacinum
effect.
Journal Article
Atmospheric mercury concentrations observed at ground-based monitoring sites globally distributed in the framework of the GMOS network
by
Carbone, Francesco
,
Zhang, Hui
,
Bencardino, Mariantonia
in
Anthropogenic factors
,
Atmosphere
,
Atmospheric and Oceanic Physics
2016
Long-term monitoring of data of ambient mercury (Hg) on a global scale to assess its emission, transport, atmospheric chemistry, and deposition processes is vital to understanding the impact of Hg pollution on the environment. The Global Mercury Observation System (GMOS) project was funded by the European Commission (http://www.gmos.eu) and started in November 2010 with the overall goal to develop a coordinated global observing system to monitor Hg on a global scale, including a large network of ground-based monitoring stations, ad hoc periodic oceanographic cruises and measurement flights in the lower and upper troposphere as well as in the lower stratosphere. To date, more than 40 ground-based monitoring sites constitute the global network covering many regions where little to no observational data were available before GMOS. This work presents atmospheric Hg concentrations recorded worldwide in the framework of the GMOS project (2010–2015), analyzing Hg measurement results in terms of temporal trends, seasonality and comparability within the network. Major findings highlighted in this paper include a clear gradient of Hg concentrations between the Northern and Southern hemispheres, confirming that the gradient observed is mostly driven by local and regional sources, which can be anthropogenic, natural or a combination of both.
Journal Article
Effects of add-on Celecoxib treatment on patients with schizophrenia spectrum disorders and inflammatory cytokine profile trial (TargetFlame): study design and methodology of a multicentre randomized, placebo-controlled trial
by
Martinuzzi, Emanuela
,
Aksar, Aslihan
,
Schneider-Axmann, Thomas
in
Acetylcysteine
,
Anti-inflammatory agents
,
Antipsychotics
2023
Neuroinflammation has been proposed to impact symptomatology in patients with schizophrenia spectrum disorders. While previous studies have shown equivocal effects of treatments with add-on anti-inflammatory drugs such as Aspirin,
N
-acetylcysteine and Celecoxib, none have used a subset of prospectively recruited patients exhibiting an inflammatory profile. The aim of the study is to evaluate the efficacy and safety as well as the cost-effectiveness of a treatment with 400 mg Celecoxib added to an ongoing antipsychotic treatment in patients with schizophrenia spectrum disorders exhibiting an inflammatory profile. The “Add-on Celecoxib treatment in patients with schizophrenia spectrum disorders and inflammatory cytokine profile trial (TargetFlame)” is a multicentre randomized, placebo-controlled phase III investigator-initiated clinical trial with the following two arms: patients exhibiting an inflammatory profile receiving either add-on Celecoxib 400 mg/day or add-on placebo. A total of 199 patients will be assessed for eligibility by measuring blood levels of three pro-inflammatory cytokines, and 109 patients with an inflammatory profile, i.e. inflamed, will be randomized, treated for 8 weeks and followed-up for additional four months. The primary endpoint will be changes in symptom severity as assessed by total Positive and Negative Syndrome Scale (PANSS) score changes from baseline to week 8. Secondary endpoints include various other measures of psychopathology and safety. Additional health economic analyses will be performed. TargetFlame is the first study aimed at evaluating the efficacy, safety and cost-effectiveness of the antiphlogistic agent Celecoxib in a subset of patients with schizophrenia spectrum disorders exhibiting an inflammatory profile. With TargetFlame, we intended to investigate a novel precision medicine approach towards anti-inflammatory antipsychotic treatment augmentation using drug repurposing.
Clinical trial registration:
http://www.drks.de/DRKS00029044
and
https://trialsearch.who.int/Trial2.aspx?TrialID=DRKS00029044
Journal Article
Influence of Growth Support on the Diversity, Composition, and Functionality of Microbial Communities Associated with Tillandsia recurvata
by
Santos, Carlos Henrique Barbosa
,
Rigobelo, Everlon Cid
,
Desoignies, Nicolas
in
Actinobacteria
,
amino acid metabolism
,
Amino acids
2024
Till
ands
ia recurvata
is an epiphytic plant commonly found in tropical regions and colonizes tree trunks, fences, and power wires. This plant plays an important role in interacting with trees, sharing microorganisms, and performing specific functions in the process of tree colonization. The objective of this study was to evaluate and compare the microbiomes of
T. recurvata
collected from two different locations (trees and fences) and two plant tissues (leaves and roots). The hypothesis of this study was that the microbiome of
T. recurvata
is composed of microorganisms that would provide nutritional support to compensate for the lack of nutrients in a particular growth support. The results showed significant differences in microbial diversity between trees and fences, with trees exhibiting higher richness and more complex microbial networks.
Proteobacteria
was the most prevalent bacterial phylum, with
Actinobacteria
and
Sphingomonas
also playing key roles in nitrogen fixation and plant growth. Fungal communities were similar across locations, with
Ascomycota
and
Basidiomycota
being predominant, but
Paraconiothyrium
and
Nigrospora
showed significant differences in abundance between trees and fences. Functional analysis indicated similar metabolic profiles across leaf and root samples, with key functions for
T. recurvata
including carbohydrate and amino acid metabolism, stress control, and biofertilization.
Journal Article
Extubation in neurocritical care patients: the ENIO international prospective study
by
Lopez-Morales, Miguel
,
Jain, Gaurav
,
Alvarez, Pablo
in
Confidence intervals
,
Extubation
,
Failure
2022
PurposeNeurocritical care patients receive prolonged invasive mechanical ventilation (IMV), but there is poor specific information in this high-risk population about the liberation strategies of invasive mechanical ventilation.MethodsENIO (NCT03400904) is an international, prospective observational study, in 73 intensive care units (ICUs) in 18 countries from 2018 to 2020. Neurocritical care patients with a Glasgow Coma Score (GCS) ≤ 12, receiving IMV ≥ 24 h, undergoing extubation attempt or tracheostomy were included. The primary endpoint was extubation failure by day 5. An extubation success prediction score was created, with 2/3 of patients randomly allocated to the training cohort and 1/3 to the validation cohort. Secondary endpoints were the duration of IMV and in-ICU mortality.Results1512 patients were included. Among the 1193 (78.9%) patients who underwent an extubation attempt, 231 (19.4%) failures were recorded. The score for successful extubation prediction retained 20 variables as independent predictors. The area under the curve (AUC) in the training cohort was 0.79 95% confidence interval (CI95) [0.71–0.87] and 0.71 CI95 [0.61–0.81] in the validation cohort. Patients with extubation failure displayed a longer IMV duration (14 [7–21] vs 6 [3–11] days) and a higher in-ICU mortality rate (8.7% vs 2.4%). Three hundred and nineteen (21.1%) patients underwent tracheostomy without extubation attempt. Patients with direct tracheostomy displayed a longer duration of IMV and higher in-ICU mortality than patients with an extubation attempt (success and failure).ConclusionsIn neurocritical care patients, extubation failure is high and is associated with unfavourable outcomes. A score could predict extubation success in multiple settings. However, it will be mandatory to validate our findings in another prospective independent cohort.
Journal Article
Sliding Window Mapping for Omnidirectional RGB-D Sensors
by
Dalmedico, Nicolas
,
Simões Teixeira, Marco Antônio
,
Ramos de Arruda, Lúcia Valéria
in
Cameras
,
deep-learning
,
Lasers
2019
This paper presents an omnidirectional RGB-D (RGB + Distance fusion) sensor prototype using an actuated LIDAR (Light Detection and Ranging) and an RGB camera. Besides the sensor, a novel mapping strategy is developed considering sensor scanning characteristics. The sensor can gather RGB and 3D data from any direction by toppling in 90 degrees a laser scan sensor and rotating it about its central axis. The mapping strategy is based on two environment maps, a local map for instantaneous perception, and a global map for perception memory. The 2D local map represents the surface in front of the robot and may contain RGB data, allowing environment reconstruction and human detection, similar to a sliding window that moves with a robot and stores surface data.
Journal Article