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Driving factors of tree biomass and soil carbon pool in xerophytic forests of northeastern Argentina

Ecological Processes 2023年第1期12卷 916-928页

作者： silvana maría josésione marcelo Germán Wilson Silvia Gabriela Ledesma Emmanuel Adrián Gabioud joséDaniel Oszust Leandro Javier Rosenberger Centro de Investigación Científica y de Transferencia Tecnológica a la Produc-ción(CICyTTP-CONICET) España 149(3105)DiamanteEntre RíosArgentina Facultad de Ciencias Agropecuarias(FCA-UNER) Universidad Nacional de Entre RíosRuta 11 Km 10.5(3101)Oro VerdeEntre RíosArgentina Instituto Nacional de Tecnología Agropecuaria(INTA) EEA ParanáRuta 11 Km 12.5(3101)Oro VerdeEntre RíosArgentina

Background The conversion of forests into agricultural lands can be a threat because the forests carbon stored could be a source of emissions. The capacity to improve the predictions on the consequences of land use change depends on the identification of factors that influence carbon pools. We investigated the key driving factors of tree biomass and soil carbon pools in xerophytic forests in northeastern Argentina. Based on analyses of forest structure variables and abiotic factors (topography and soil properties) from 18 mature forests, we evaluated carbon pools using uniand multivariate (redundancy analysis) methods. Results The total carbon pool was estimated at 102.4 ± 24.0 Mg ha−1. Soil organic carbon storage is the single largest carbon pool relative to tree biomass, representing 73.1% of total carbon. Tree canopy cover and basal area were positively correlated with biomass carbon pool (r = 0.77 and r = 0.73, p < 0.001, respectively), proving to be significant drivers of carbon storage in this compartment. Slope, soil clay content and cation-exchange capacity had a better explanation for the variability in soil carbon pools, and all showed significant positive correlations with soil carbon pools (r = 0.64, 0.60 and 0.50;p < 0.05, respectively). The vertisols showed a 27.8% higher soil carbon stock than alfisols. Conclusions The relevance of our study stems from a dearth of information on carbon pools and their drivers in xerophytic forests, and in particular, the importance of this ecosystems’ type for Argentina, because they cover 81.9% of native forest area. Basal area and tree canopy cover exert a strong effect on the carbon pool in tree biomass but not in the soil. The results suggests that there is a potentially major SOC accumulation in forests located in slightly sloping areas and soils with higher topsoil clay content, such as vertisols. This could provide an important reference for implementing forestry carbon sink projects.

关键词： Carbon pool Forest biomass Soil parameters Ecosystem services

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c-Abl kinase at the crossroads of healthy synaptic remodeling and synaptic dysfunction in neurodegenerative diseases

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Neural Regeneration Research 2023年第2期18卷 237-243页

作者： Daniela A.Gutiérrez América Chandía-Cristi maría joséYáñez silvana Zanlungo Alejandra R.Alvarez Cell Signaling Laboratory Department of Cellular and Molecular BiologyCenter for Aging and Regeneration(CARE)Millennium Institute on Immunology and ImmunotherapyBiological Sciences FacultyPontificia Universidad Católica de ChileSantiagoChile School of Medical Technology Health Sciences FacultyUniversidad San SebastianSede Los LeonesSantiagoChile Department of Gastroenterology Faculty of MedicinePontificia Universidad Católica de ChileSantiagoChile

Our ability to learn and remember depends on the active formation,remodeling,and elimination of ***,the development and growth of synapses as well as their weakening and elimination are essential for neuronal *** structural reorganization of synaptic complexes,changes in actin cytos keleton and organelle dynamics,as well as modulation of gene expression,determine synaptic *** has been proposed that dys regulation of these key synaptic homeostatic processes underlies the synaptic dysfunction observed in many neurodegenerative *** is known about downstream signaling of activated N-methyl-D-aspartate andα-amino-3-hydroxy-5-methyl-4-isoazolepro pionate receptors;howeve r,other signaling pathways can also contribute to synaptic plasticity and long-lasting changes in learning and *** non-receptor tyrosine kinase c-Abl(ABL1)is a key signal transducer of intra and extracellular signals,and it shuttles between the cyto plasm and the *** review focuses on c-Abl and its synaptic and neuronal ***,we discuss the evidence showing that the activation of c-Abl can be detrimental to neurons,promoting the development of neurodegenerative ***,c-Abl activity seems to be in a pivotal balance between healthy synaptic plasticity,regulating dendritic spines remodeling and gene expression after cognitive training,and synaptic dysfunction and loss in neurodegenerative ***,c-Abl genetic ablation not only improves learning and memory and modulates the brain genetic program of trained mice,but its absence provides dendritic spines resiliency against *** re,the present review has been designed to elu cidate the common links between c-Abl regulation of structural changes that involve the actin cytos keleton and organelles dynamics,and the transc riptional program activated during synaptic *** summarizing the recent discove ries on c-Abl functions,we aim to provide an overview of how

关键词： actin cytoskeleton activity-dependent plasticity Alzheimer's disease c-Abl dendritic spines learning synapse synaptic plasticity transcription tyrosine kinase

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Lymphomatous involvement of gastrointestinal tract: Evaluation by positron emission tomography with ^(18)F-fluorodeoxyglucose

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World Journal of Gastroenterology 2005年第46期11卷 7284-7289页

作者： Sith Phongkitkarun Vithya Varavithya Toshiki Kazama silvana C Faria martha V mar Donald A Podoloff Homer A Macapinlac Departments of Diagnostic Radiology and Nuclear MedicineBox 057 The University of Texas MDAnderson Cancer Center1515 Holcombe Blvd.HoustonTXUnited States

AIM： To demonstrate the ^18F-fluorodeoxyglucose positron emission tomography （18F-FDG PET） findings in patients with non-Hodgkin＇s lymphoma （NHL） involving the gastrointestinal （GI） tract and the clinical utility of modality despite of the known normal uptake of FDG in the GI tract. METHODS： Thirty-three patients with biopsy-proven gastrointestinal NHL who had undergone FDG-PET scan were induded. All the patients were injected with 10-15 mCJ FDG and scanned approximately 60 min later with a CTI/ Siemens HR （＋） PET scanner. PET scans were reviewed and the maximum standard uptake value （SUVmax） of the lesions was measured before and after the treatment, if data were available and compared with histologic diagnoses. RESULTS： Twenty-five patients had a high-grade lymphoma and eight had a low-grade lymphoma. The stomach was the most common site of the involvement （20 patients）. In high-grade lymphoma, PET showed focal nodular or diffuse hypermetabolic activity. The average SUVmax＋SD was 11.58±5.83. After the therapy, the patients whose biopsies showed no evidence of lymphoma had a lower uptake without focal lesions. The SUVmax＋SD decreased from 11.58±5.83 to 2.21± 0.78. in patients whose post-treatment biopsies showed lymphoma, the SUVmax＋SD was 9.42±6.27. Low-grade follicular lymphomas of the colon and stomach showed diffuse hypermetabolic activity in the bowel wall （SUVmax= 8.2 and 10.3, respectively）. The SUVmax was 2.02-3.8 （mean 3.02） in the stomach lesions of patients with MALT lymphoma. CONCLUSION： ^18F-FDG PET contributes to the diagnosis of high-grade gastrointestinal non-Hodgldn＇s lymphoma, even when there is the normal background FDG activity. Furthermore, the SUV plays a role in evaluating treatment response. Low-grade NHL demonstrates FDG uptake but at a lesser intensity than seen in high-grade NHL.

关键词： Positron emission tomography Non-Hodgkin's lymphoma Gastrointestinal neoplasm

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Metastatic gastric cancer from breast carcinoma presenting with paraneoplastic rheumatic syndrome:A case report

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World Journal of Clinical Cases 2023年第14期11卷 3282-3287页

作者： marília Bortoluz Rech Eduarda Renz da-Cruz Karina Salgado Raul Angelo Balbinot silvana Sartori Balbinot Jonathan Soldera School of Medicine Universidade de Caxias do SulCaxias do Sul 95070-560Rio Grande do SulBrazil Department of Pathology ICAP PathologyCaxias do Sul 95020-002Rio Grande do SulBrazil Department of Clinical Gastroenterology Universidade de Caxias do SulCaxias do Sul 95070-560Rio Grande do SulBrazil

BACKGROUND Breast cancer is the most frequently diagnosed cancer *** is the leading cause of death by malignant disease in *** SUMmarY A female patient,73 years of age,sought care due to weakness,mild abdominal pain,arthralgia,and weight *** was taking anastrazole as maintenance therapy for localized breast cancer and had moderate anemia and elevated acutephase *** digestive endoscopy showed isolated erosion in the gastric *** lesion was compatible with signet-ring cell adenocarcinoma in anatomopathological study and was confirmed as metastasis of a breast carcinoma in immunohistochemistry,which was positive for estrogen *** imaging studies determined numerous proximal bone *** patient was treated with prednisone for paraneoplastic syndrome,which improved the anemia and rheumatic disease,and with chemotherapy,which greatly improved the *** has been followed-up for 6 mo,and her anemia,arthralgias,and acute phase markers have *** Systemic treatment strategies seem to be the best choice for gastric metastasis from breast cancer,resulting in disease control and relapse-free *** studies with longer follow-up are needed to better understand the biological,pathological,and clinicopathological characteristics and outcomes of the endoscopic features associated with metastatic gastric cancer from breast carcinoma.

关键词： Breast cancer Gastric metastasis Anemia Paraneoplastic syndrome Case report

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Palm oil biodiesel:An assessment of PAH emissions,oxidative potential and ecotoxicity of particulate matter

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Journal of Environmental Sciences 2021年第3期33卷 326-338页

作者： silvana Arias Francisco Molina John R.Agudelo Grupo de Investigación en Gestión y Modelación Ambiental-GAIA Escuela AmbientalFacultad de IngenieríaUniversidad de Antioquia UdeACalle 70 No.52-21MedellínColombia Departamento de Ingeniería Mecánica Universidad de Antioquia UdeA

This work assessed the impact of fuelling an automotive engine with palm biodiesel(pure,and two blends of 10%and 20%with diesel,B100,B10 and B20,respectively)operating under representative urban driving conditions on 17 priority polycyclic aromatic hydrocarbon(PAH)compounds,oxidative potential of ascorbic acid(OP^(AA)),and ecotoxicity through D aphnia pulex mortality *** diluted with filtered fresh air(WD)gathered in a minitunel,and particulate matter(PM)collected directly from the exhaust gas stream(W/oD)were used for *** showed that PM collecting method significantly impact PAH *** all PAH appeared in both,WD and W/oD,higher concentrations were obtained in the last *** biodiesel concentration in the fuel blend decreased all PAH compounds,and those with 3 and 5 aromatic rings were the most *** biodiesel affected both OP^(AA)and *** B10 and B20 exhibited the same rate of ascorbic acid(AA)depletion,B100 showed significant faster oxidation rate during the first four minutes and oxidized 10%more AA at the end of the test.B100 and B20 were significantly more ecotoxic than *** lethal concentration LC50 for B10 was 6.13 mg/*** was concluded that palm biodiesel decreased PAH compounds,but increased the oxidative potential and ecotoxicity.

关键词： Biodiesel Particulate matter P emissions Oxidative stress Ecotoxicity Daphnia pulex

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New neuroprotective perspectives in fighting oxidative stress and improving cellular energy metabolism by oleocanthal

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Neural Regeneration Research 2019年第7期14卷 1217-1218页

作者： Cristina Angeloni Laura Giusti silvana Hrelia School of Pharmacy University of Camerino Department of Clinical and Experimental Medicine University of Pisa Department for Life Quality Studies Alma Mater Studiorum-University of Bologna

Neurodegenerative diseases are a heterogeneous group of disorders characterized by a progressive dysfunction and death of neural cells which lead to compromised motor or cognitive ***,the loss of neuron is associated with both gliosis and,frequently,with abnormal accumulation of extracellular and intracellular filamentous deposit in specific cell *** a rapidly increasing aging population,these diseases are becoming a primary health problem(Albers and Beal,2000).

关键词： New neuroprotective fighting oxidative

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Predicting stable crystalline compounds using chemical similarity

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npj Computational Materials 2021年第1期7卷 99-107页

作者： Hai-Chen Wang silvana Botti Miguel A.L.marques Institut für Physik Martin-Luther-Universität Halle-Wittenberg06120 Halle(Saale)Germany Institut für Festkörpertheorie und-Optik Friedrich-Schiller-Universität Jena and European Theoretical Spectroscopy FacilityMax-Wien-Platz 107743 JenaGermany

We propose an efficient high-throughput scheme for the discovery of stable crystalline *** approach is based on the transmutation of known compounds,through the substitution of atoms in the crystal structure with chemically similar *** concept of similarity is defined quantitatively using a measure of chemical replaceability,extracted by data-mining experimental *** this way we build 189,981 possible crystal phases,including 18,479 that are on the convex hull of *** resulting success rate of 9.72%is at least one order of magnitude better than the usual success rate of systematic high-throughput calculations for a specific family of materials,and comparable with speed-up factors of machine learning filtering *** a characterization of the set of 18,479 stable compounds,we calculate their electronic band gaps,magnetic moments,and *** approach,that can be used as a filter on top of any high-throughput scheme,enables us to efficiently extract stable compounds from tremendously large initial sets,without any initial assumption on their crystal structures or chemical compositions.

关键词： stability similarity crystalline

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Synthesis of Water-soluble, Polyester-based Dendrimer Prodrugs for Exploiting Therapeutic Properties of Two Triterpenoid Acids

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Chinese Journal of Polymer Science 2018年第9期36卷 999-999,1000-1010页

作者： silvana Alfei Gaby Brice Taptue Silvia Catena Angela Bisio Dipartimento di Farmacia Sezione di Chimica e Tecnologie Farmaceutiche e Alimentari Università di Genova

Dendrimers are macromolecules characterized by high controlled size, shape and architecture, presence of inner cavities able to accommodate small molecules and many peripheral functional groups to bind target entities. They are of eminent interest for biomedical applications, including gene transfection, tissue engineering, imaging, and drug delivery. The well-known pharmacological activities of ursolic and oleanolic acids are limited by their small water solubility, non-specific cell distribution, low bioavailability, poor pharmacokinetics, and their direct administration could result in the release of thrombi. To overcome such problems, in this paper we described their physical incorporation inside amino acids-modified polyester-based dendrimers which made them highly water-soluble. IR, NMR, zeta potential, mean size of particles, buffer capacity and drug release profiles of prepared materials were reported. The achieved water-soluble complexes harmonize a polycationic character and a buffer capacity which presuppose efficient cell penetration and increased residence time with a biodegradable cell respectful scaffold, thus appearing as a promising team of not toxic prodrugs for safe administration of ursolic and oleanolic acids.

关键词： Polyester-based amino acids-modified dendrimers Physical encapsulation Water-soluble dendriplexes Buffer capacity NMR investigations

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Biosolid Application to Agricultural Land a Contribution to Global Phosphorus Recycle： A Review

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Pedosphere 2017年第1期27卷 1-16页

作者： silvana Irene TORRI Rodrigo Studart CORRt Giancarlo RENELLA Department of Natural Resources and Environment School of Agriculture University of Buenos Aires Avenue San Martin 4453 Buenos Aires 1417 DSE (Argentina) University of Brasilia-UnB/PPGCA Campus Darcy Ribeiro Caixa Postal 04401 70910-970 DF (Brazil) Department of Agrifood Production and Environmental Sciences University of Florence Piazzale delle Caseine 18 Florence 50144 (Italy)

Phosphorus(P) is an essential nutrient required for plant *** population growth and rising global demand for food are expected to increase the demand for phosphate ***,high-quality phosphate rock reserves are progressively becoming *** of the increased pressure on P resources could be alleviated by recycling P present in ***,it is crucial to understand the dynamics of P in biosolid-amended soils,the effects of residual biosolid-borne P in soils,the way in which microorganisms may control P dynamics in biosolid-amended soils and the environmental implications of the use of biosolids as a source of *** research is needed to maximize biosolid-borne P uptake by crops and minimize its loss from biosolid-amended *** analysis of the microbiological control of P dynamics in biosolid-amended soils indicates interactions of biosolid P with other nutrients such as carbon(C) and nitrogen(N),suggesting that harmonization of the current regulation on the use of biosolids in agriculture,mainly based on total N and pollutant contents,is needed to better recycle P in agriculture.

关键词： anthropogenic P phosphate P availability P biogeocycle P uptake runoff P

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Antiglycative activity of sulforaphane: a new avenue to counteract neurodegeneration?

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Neural Regeneration Research 2015年第11期10卷 1750-1751页

作者： Cristina Angeloni marco Malaguti silvana Hrelia Department for Life Quality Studies Alma Mater StudiorumUniversity of Bologna

Neurodegeneration is a key aspect of a large number of diseases that come under the umbrella of＂neurodegenerative diseases＂with the most notable being Parkinson＇s,Alzheimer＇s,and Huntington＇s diseases（AD,PD,HD）.They are all incurable and debilitating conditions that result in progressive degeneration and/or death of neurons and are the leading cause of disability in the elderly. The incidence of these diseases is on the rise and yet there is a paucity of effective therapies to treat them.

关键词： Antiglycative activity of sulforaphane

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