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Sudden openings and gradual closures in canopy cover modulate acclimation,survival,and growth of a shade-tolerant rainforest tree species

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Journal of Forestry Research 2024年第5期35卷 78-90页

作者： Ana Paula Moretti flavia Yesica Olguin Juan Marcelo Gauna Corina Graciano INFIVE(CONICET-Universidad Nacional de La Plata) Diagonal 113 N°4951900 La PlataProvincia de Buenos AiresArgentina CONICET Godoy Cruz 2290C1425FQB Buenos AiresArgentina Facultad de Ciencias Agrariasy Forestales Universidad Nacional de La PlataCalle 60y 1181900 La PlataProvincia de Buenos AiresArgentina Facultad de Ciencias Forestales Universidad Nacional de MisionesBertoni 124 km 33380 EldoradoProvincia de MisionesArgentina

Forest disturbances at gap levels are one of the most important events for the regeneration and establishment of intermediate tree *** canopy openings expose plants to high light intensity and high evaporative demands that stress shade-acclimated ***,the slow closure of gaps reduces light availability to plants established when the incident irradiation was *** work evaluated the morphological and physiological acclimation of Cabralea canjerana(Vell)*** to sudden and to gradual changes in canopy cover.A pot experiment was carried out with plants exposed to a sudden opening.A few days after the light shock,plants rapidly increased photosynthetic rates and decreased leaf water *** two months,plants activated physiological responses at leaf and whole plant levels to high light and water stresses,e.g.,increased stoma-tal conductance,stomatal index and reduction of leaf:fine roots ratio and *** seven months,hydraulic conductivity of petioles and the whole leaf increased,and growth was much higher than plants that remained under the *** a field experiment in gaps in the rainforest,plants acclimated to all canopy *** years after planting,growth was maximum in open environments within the gaps,even if the canopy closed during the first 20 months after *** conclusion,if this species is planted to enrich the rainforest,positions within gaps with lower canopy cover should be chosen and gap closure will not affect *** manage *** natural regeneration,the opening of gaps and removal of understory will increase survival and growth without the risk that the stress caused by these sudden openings could lead to the death of ***-bining pot and field experiments helps to understand the autecology of trees with particular ecological interest,and to build sound restoration practices.

关键词： Cabralea canjerana Atlantic forest Abiotic stress Regeneration Seedling

Primary liver transplantation vs transplant after Kasai portoenterostomy in children with biliary atresia: A retrospective Brazilian single-center cohort

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World Journal of Transplantation 2024年第1期14卷 112-119页

作者： Melina Utz Melere Valberto Sanha Marco Farina Carolina Soares da Silva Luiza Nader Cristine Trein Angelica Maria Lucchese Cristina Ferreira Antonio Nocchi Kalil flavia Heinz Feier Department of Hepatology and Liver Transplantation Santa Casa de Porto AlegrePorto Alegre 90050170Brazil Department of Hepato-biliary-pancreatic Surgery and Liver Transplantation Irmandade Santa Casa de Misericórdia de Porto AlegrePorto Alegre 90020-090Brazil Department of Surgical Oncology Santa Rita Hospital/Santa Casa de Misericórdia de Porto AlegrePorto Alegre 90050-170Rio Grande do SulBrazil

BACKGROUND Biliary atresia(BA)is the most common indication for pediatric liver transplantation,although portoenterostomy is usually performed ***,due to the high failure rate of portoenterostomy,liver transplantation has been advocated as the primary procedure for patients with *** is still unclear if a previous portoenterostomy has a negative impact on liver transplantation *** To investigate the effect of prior portoenterostomy in infants un-dergoing liver transplantation for *** This was a retrospective cohort study of 42 pediatric patients with BA who underwent primary liver transplantation from 2013 to 2023 at a single tertiary center in *** with BA were divided into two groups:Those undergoing primary liver transplantation without portoenterostomy and those undergoing liver transplantation with prior *** variables were compared using the Student’s t-test or the Kruskal-Wallis test,and categorical variables were compared using theχ2 or Fisher’s exact test,as *** Cox regression analysis was performed to determine risk factors for portal vein *** and graft survival analyses were conducted with the Kaplan–Meier product-limit estimator,and patient subgroups were compared using the two-sided log-rank *** Forty-two patients were included in the study(25[60%]girls),23 undergoing liver transplantation without prior portoenterostomy,and 19 undergoing liver transplantation with prior *** with prior portoenterostomy were older(12 vs 8 months;P=0.02)at the time of liver transplantation and had lower Pediatric End-Stage Liver Disease scores(13.2 vs 21.4;P=0.01).The majority of the patients(35/42,83%)underwent livingdonor liver *** group of patients without prior portoenterostomy appeared to have a higher incidence of portal vein thrombosis(39 vs 11%),but this result did not reach statistical *** portoenterostomy

关键词： Hepatic portoenterostomy Biliary atresia Liver transplantation Patient outcome assessment Portal vein Survival

Human leukocyte antigen compatibility and incidence of donorspecific antibodies in pediatric liver transplant recipients

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World Journal of Gastroenterology 2024年第33期30卷 3837-3845页

作者： Melina U Melere flavia H Feier Jorge Neumann Antônio N Kalil Juliana de M Montagner Luiza S Nader Carolina S da Silva Marco Aurélio F Junior Gabriela P Coral Guilherme P Bobsin Cristina T Ferreira Department of Hepatology and Liver Transplantation Santa Casa de Porto AlegrePorto Alegre 90050170Rio Grande do SulBrazil Department of Hepato-biliary-pancreatic Surgery and Liver Transplantation Irmandade Santa Casa de Misericórdia de Porto AlegrePorto Alegre 90020-090Rio Grande do SulBrazil Postgraduation Program in Medicine:Hepatology Federal University of Health Sciences of Porto AlegrePorto Alegre 90050-170Rio Grande do SulBrazil Laboratory of Transplantation Immunology Irmandade Santa Casa de Misericórdia de Porto AlegrePorto Alegre 90020-090Rio Grande do SulBrazil

BACKGROUND Antibody-mediated rejection following liver transplantation(LT)has been increasingly recognized,particularly with respect to the emergence of de novo donor-specific antibodies(DSAs)and their impact on graft *** substantial evidence for adult populations exists,research focusing on pediatric LT outcomes remains *** To investigate the prevalence of human leukocyte antigen(HLA)mismatches and DSA and evaluate their association with rejection episodes after pediatric *** A cohort of pediatric LT recipients underwent HLA testing at Santa Casa de Porto Alegre,Brazil,between December 2013 and December *** patients who survived for>30 days after LT with at least one DSA analysis were *** classes I and II and cross-matches were *** presence of de novo DSA(dnDSA)was evaluated at least 3 months after LT using the Luminex®single antigen bead method,with a positive reaction threshold set at 1000 *** episodes were confirmed by liver *** Overall,67 transplanted children were analyzed;61 received grafts from living donors,85%of whom were related to ***-transplant DSA(class I or II)was detected in 28.3%of patients,and dnDSA was detected in 48.4%.The median time to DSA detection after LT was 19.7[interquartile range(IQR):4.3-35.6]*** rejection occurred in 13 patients at follow-up,with C4d positivity observed in 5/13 Liver *** median time to rejection was 7.8(IQR:5.7-12.8)*** presence of dnDSA was significantly associated with rejection(36%vs 3%,P<0.001).The rejection-free survival rates at 12 and 24 months were 76%vs 100%and 58%vs 95%for patients with dnDSA anti-DQ vs those without,*** Our findings highlight the importance of incorporating DSA assessment into pre-and post-transplantation protocols for pediatric LT *** implications may include immunosuppression minimization strategies based on this analysis in pediatric LT recip

关键词： Human leukocyte antigens Donor-specific antibodies Liver transplantation Pediatric Rejection

Evaluation of the Antibacterial and Antifungal Capacity of Nanoemulsions Loaded with Synthetic Chalcone Derivatives Di-Benzyl Cinnamaldehyde and Benzyl 4-Aminochalcone

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Journal of Renewable Materials 2024年第2期12卷 285-304页

作者： flavia Oliveira Monteiro da Silva Abreu Taysse Holanda Joice Farias do Nascimento Henety Nascimento Pinheiro Rachel Menezes Castelo Hélcio Silva dos Santos Thais Benincá Patrícia da Silva Malheiros Júlio César Sousa Prado Raquel de Oliveira Fontenelle Maria Madalena de Camargo Forte Natural Polymers Laboratory PPGCNState University of CearáFortaleza60.714.903Brazil Polymeric Materials Laboratory PPGE3MFederal University of Rio Grande do SulPorto Alegre91501-970Brazil Natural Product Chemistry Laboratory PPGCNState University of CearáFortaleza60.714.903Brazil Food Hygiene and Microbiology Laboratory PPGCTAFederal University of Rio Grande do SulPorto Alegre91501-970Brazil Microbiology Laboratory Medicine SchoolFederal University of CearáSobral62010-560Brazil

With the increase in antimicrobial resistance,it has become necessary to explore alternative approaches for combating and preventing ***-cinnamaldehyde(CNM)and Benzyl4-amino(B4AM)are bioactive compounds derived from chalcones but with restricted solubility in aqueous *** can enhance the solubility of compounds and can be a promising alternative in the development of novel antimicrobials,with reduced side effects and prolonged *** objective of this study was to evaluate the stability of oil-in-water nanoemulsions loaded with two distinct types of chalcones at two different dosages,to propose a stable formulation with antimicrobial *** showed that nanoemulsions presented high encapsulation efficiency,low polydispersity index(PDI)and particle size below 200 nm,indicating that emulsification was a suitable method for nanoemulsion *** with higher dosages exhibited significant antimicrobial effects when compared to free chalcones and positive ***,B4AM nanoemulsions at higher dosages showed expressive activity against Salmonella minnesota,with a 420%greater inhibitory response compared to the free form and showing equivalence to the positive *** nanoemulsions showed excellent inhibitory activity at the highest dosage,equivalent to the positive control against *** and Staphylococcus *** greater number of conjugated bonds in CNM increased the antimicrobial activity in comparison with B4AM,and the formation of nanometric domains enhanced the bioavailability,being a promising alternative for antimicrobial applications.

关键词： Polysaccharide nanoemulsions S.aureus S.minnesota chalcones alginate

Vitamin B12-induced spermatogenesis recovery in cimetidine-treated rats： effect on the spermatogonia number and sperm concentration

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Asian Journal of Andrology 2017年第5期19卷 567-572页

作者： flavia L Beltrame Estela Sasso-Cerri Department of Morphology and Genetics Federal University of Sao Paulo (UNIFESP/EPM) Sao Paulo Brazil Department of Morphology Laboratory f Histology and Embryology Dental School - Sao Paulo State University (UNESP/FOAr) Araraquara Sao Paulo Brazil

The H2-receptor antagonist cimetidine is an antiulcer drug also used for the treatment of cancer due to its antiangiogenic effect. However, this drug has caused structural changes in the seminiferous tubules. Vitamin B12 has been used as a therapeutic agent for the treatment of male infertility. The supplementation of rats with vitamin B12 during cimetidine treatment has recovered the damaged seminiferous tubules, but how this vitamin restores the seminiferous epithelium has not been clarified. In this study, we evaluated whether vitamin B12 improves the number of spermatogonia, spermatocytes, and sperm concentration in cimetidine-treated rats. Adult male rats were treated for 50 days as follows： cimetidine group received 100 mg kg^-1 b.w. of cimetidine, cimetidine-B12 group received cimetidine and 3 μg of vitamin B12-hydroxocobalamin, B12 group received only 3 μg of vitamin, and control group received saline. Sperm concentration was calculated and historesin-embedded testes sections were used for the quantitative analyses of spermatogonia （A; In/B） and spermatocytes. TUNEL method and PCNA immunofluorescence were performed. Cimetidine caused a significant reduction in sperm concentration. TUNEL-positive spermatogonia and spermatocytes were correlated to a significant reduction in the number of these cells. In cimetidine-B12 group, sperm concentration was higher than cimetidine group and a significant increase in the number of spermatogonia （stages Ⅱ-Ⅵ） was correlated to a high incidence of PCNA-immunolabeled spermatogonia and spermatocytes. The results show that the supplementation of rats with vitamin B12 during cimetidine treatment increases sperm concentration and exerts a potential effect in the recovery of spermatogonia and spermatocytes.

关键词： cimetidine fertility spermatogenesis testis vitamin B12

Protective potential of glucagon like peptide 2(GLP-2) against the neurodegeneration

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Neural Regeneration Research 2019年第11期14卷 1901-1902页

作者： Antonella Amato flavia Mulè Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF) Università di Palermo

Neurodegeneration consists in loss of neuron specific types, pattern and distribution, leading to progressive dysfunctions of the central nervous system. Neurodegenerative diseases include diverse pathological conditions, among which Alzheimer’s and Parkinson’s diseases are the most prevalent ones. Alzheimer’s disease is known as a growing dementia, characterized by progressive language, memory, and cognitive loss, while Parkinson’s disease is primarily characterized as a motor disorder. Senile plaques, caused by amyloid β peptide, hyperphosphorylated taubased neurofibrillary tangles and synapse loss, are the principal pathological hallmarks of Alzheimer’s disease.

关键词： Protective potential glucagon like peptide 2(GLP-2) neurodegeneration

Effects of biological soil crusts and drought on emergence and survival of a Patagonian perennial grass in the Monte of Argentina

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Journal of Arid Land 2014年第6期6卷 735-741页

作者： flavia Alejra FUNK Alejro LOYDI Guadalupe PETER Center for Renewable Natural Resources of the Semi-arid Zone National Scientific and Technical Research Council (CONICET)Bahía Blanca 8000Argentina Río Negro National University Viedma 8500Argentina

Biological soil crusts are widely distributed in arid and semiarid regions. They have an important eco- logical role, especially by modifying physical and chemical properties of soils. Biological crusts may also modify seed germination and seedling establishment. The effects vary widely according to the type of crust and the vas- cular plant species. The objective of this study was to determine the effect of moss-dominated biological soil crusts on the emergence, biomass and survival of Poa ligularis Nees ex Steud. under different irrigation regimes. We col- lected seeds of P. ligularis and biological soil crusts composed of two species of mosses： Syntrichia princeps （De Not.） Mitt and Ceratodon purpureus （Hedw.） Brid. from an area in the Monte of Argentina. The result showed that seedling emergence of P. ligularis was higher in treatments with bare soil than in soil covered by crusts, and also in those with watering to field capacity. Mean emergence time was higher in treatments with bare soil and watering to field capacity. Seedling biomass also showed significant differences between treatments. These results suggest that biological soil crusts dominated by mosses do not promote P. ligularis emergence, although they would not affect its survival.

关键词： drought field capacity recruitment microsites mosses semiarid region Poa ligularis

Vegetation recovery after fire in mountain grasslands of Argentina

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Journal of Mountain Science 2020年第2期17卷 373-383页

作者： Alejandro LOYDI flavia AFUNK Andrés GARCíA Renewable Natural Resources Center of the Semi-Arid Zone(CERZOS)–CONICET-UNS Bahia BiancaArgentina Department of Biology Biochemistry and PharmacySouth National UniversityBahfa BiancaArgentina Argentine Institute of Oceanography(IADO) CONICET-UNSBahia BlancaArgentina

Fire is a natural disturbance occurring every few years in many grasslands ecosystems. However, since European colonization, fire has been highly reduced or even suppressed in Argentinean grasslands, fostering ignitable material accumulation. This has led to occasional catastrophic controldemanding fire events, extended for larger areas. The aims of this work are to study vegetation recovery and change after a non-natural fire event in mountain grasslands. The study area is located in the Ventania mountain system, mid-eastern Argentina. We studied vegetation recovery after fire(January 2014) in two different communities: grass-steppes(grasslands) and shrub-steppes(open low shrublands). We measured vegetation cover, species richness and bare ground percentage in burned and unburned areas 1, 4, 8, 11 and 23 months after fire. Vegetation surveys were also performed at the end of the growing season(December) 11 and 23 months after fire. Data were analyzed using regression analysis, ANOVA and multivariate analysis(NMS, PERMANOVA). Both communities increased their vegetation cover at the same rate, without differences between burned and unburned areas after two years. Species richness was higher in shrublands and their recovery was alsofaster than in grasslands. Considering functional composition, besides transient changes during the first year after fire, there were no differences in abundance of different functional vegetation groups two years after fire. At the same time, shrublands showed no differences in species composition, while grasslands had a different species composition in burned and unburned plots. Also, burned grassland showed a higher species richness than unburned grassland. Data shown mountain vegetation in Pampas grassland is adapted to fire, recovering cover and richness rapidly after fire and thus reducing soil erosion risks. Vegetation in mountain Pampas seems to be well adapted to fire, but in grasslands species composition has changed due to fire.

关键词： Amelichloa caudata Forbs Grass Natural grassland Nassella trichotoma Piedmont valleys Shrubs Sierra de la Ventana Vegetation functional groups

Should selection criteria for HCC be the same(or different)between LDLT and DDLT?

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Hepatoma Research 2020年第11期6卷 13-17页

作者： flavia Feier Liver Transplantation Department Hospital de Clinicas de Porto AlegrePorto Alegre 90035-903Brazil Pediatric Liver Transplantation Department Irmandade Santa Casa de Porto AlegrePorto Alegre 90020-090Brazil

Since the Milan Criteria(MC)were adopted in many countries as the allocation policy criteria for patients with hepatocellular carcinoma to be transplanted,many groups started to expand it to provide a chance for patients with tumors outside the MC who could achieve similar survival *** the scarcity of deceased donors,Asian countries improved the results with living donor liver transplantation,allowing patients outside MC to be transplanted with a living *** prognostic models and a more profound understanding of tumor behavior are targeting better patient ***,patients are unevenly selected for liver transplantation and mostly separated into those fulfilling the MC and transplanted with a deceased donor and those with expanded criteria and transplanted with a living *** this paper,insight is brought into this debate.

关键词： Living donor hepatocellular carcinoma alpha-fetoprotein