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Lídia Da Silva Pereira,Thaynã Amanda Melo Souza,Rafael Walter,Cláudia Pombo Sudré,Layrana De Azevedo Dos Santos,Gabriel Bonan Taveira,Álan Chrisley Maracahipes,Virginia Silva Carvalho,Celso Shiniti Na 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.3
Diseases caused by phytopathogenic microorganisms are diffi cult to control and can aff ect plants at diff erent stages of theirdevelopment. Several resistance genes and antimicrobial peptides (AMPs) have been identifi ed and related to the resistanceprocess of Capsicum . In recent years, studies have shown that peppers, especially the accession UENF1381, present resistanceagainst phytopathogenic microorganisms. This work aimed identify and characterize AMPs of the leaf and root from Capsicumannuum L. UENF1381 and to analyze the inhibitory activity of the AMPs on diff erent enzyme families and valuated theinhibitory activity on Colletotrichum scovillei. Initially, self-fertilized pepper seeds were cultured for 45 days in glass fl askscontaining ½-MS medium. Then, leaves were inoculated with inoculum of Xanthomonas euvesicatoria (10 8 CFU mL −1 )or water (control). Leaf and root samples were collected at 12, 24 and 48 h after inoculation to extraction. The activity ofextracts on diff erent enzyme families was analyzed by incubating the enzymes (trypsin, α-amylase and β-1,3-glucanase)with 30 μg mL −1 of the obtained extracts. The eff ect of extracts on fungi was also tested. It was identifi ed that protein of leafand root extracts from C. annuum L. UENF1381 presented a majority of bands with a low molecular mass (6–14 kDa). Weobserved that all leaf and root extracts signifi cantly inhibited trypsin and α-amylase activity and able to signifi cantly inhibitC. scovillei growth. With this work we hope to contribute to the use of peptides as potential molecules in microbial controland in the development of new Capsicum cultivars resistant to microorganisms.
Carlos Walter Sobrado Júnior,Carlos de Almeida Obregon,Afonso Henrique da Silva e Sousa Júnior,Lucas Faraco Sobrado,Sérgio Carlos Nahas,Ivan Cecconello 대한대장항문학회 2020 Annals of Coloproctolgy Vol.36 No.4
Purpose: Present an updated classification for symptomatic hemorrhoids, which not only guides the treatment of internal hemorrhoids but also the treatment of external components. In addition, this new classification includes new treatment alternatives created over the last few years. Methods: Throughout the past 7 years, the authors developed a method to classify patients with symptomatic hemorrhoids. This study, besides presenting this classification proposal, also retrospectively analyzed 149 consecutive patients treated between March 2011 and November 2013 and aimed to evaluate the association between the management adopted with Goligher classification and our proposed BPRST classification. Results: Both classifications had a statistically significant association with the adopted management strategies. However, the BPRST classification tended to have fewer management discrepancies when each stage of disease was individually analyzed. Conclusion: Although there is much disagreement about how the classification of hemorrhoidal disease should be updated, it is accepted that some kind of revision is needed. The BPRST method showed a strong association with the management that should be adopted for each stage of the disease. Further studies are needed for its validation, but the current results are encouraging.
Tailoring the Electrical Properties of ZnO/Polyaniline Heterostructures for Device Applications
Jorlandio F. Felix,Eronides F. da Silva Jr.,Elder A. de Vasconcelos,Walter M. de Azevedo 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.51
Low-cost nanostructured high-quality ZnO/Polyaniline heterostructure devices are produced by using the thermal evaporation and spin coating techniques. The devices present highly rectifying I-V characteristics, and under certain conditions, varistor characteristics are present with symmetric rectifying properties in both polarizations. The results indicate that by tuning the thickness of the ZnO thin film or the polymer doping state, the device's electrical characteristics go from a standard diode (rectifying in forward polarization) to those of a varistor (rectifying in both forward and reverse polarizations). Further, only a device made with undoped polyaniline (PANI) may have its operation range tuned by adjusting properly the ZnO film's thickness. The behavior observed is attributed to interfusion of ZnO-based composites, in the early stages of deposition, into the polymer chains and to the conducting islands surrounding the insulating sea in the PANI film. This gives rise to the formation of micron-sized Schottky contacts that electrically arrange themselves in a back-to-back configuration.
Marcos R da S Vieira,Luiz G M Pessoa,Walter S E Junior,Ygor H Leal,Luzia F da Silva,Rafael C Silva,Eduardo S dos Santos,Thialla L Amorim,Damina C de Medeiros 한국원예학회 2016 Horticulture, Environment, and Biotechnology Vol.57 No.2
This study aimed to assess changes in peroxidase activity and total protein content of cut flowers of Strelitzia reginae that were treated with the chemical preservatives 8-hydroxyquinoline citrate (8-HQC) or chlorine during cold storage. The bases of the cut flowers were immersed in 1.5 L of tap water with 48 h pulsing treatments (a control with no chemical preservatives (0 mg·L-1, 100 mg·L-1 chlorine, 250 mg·L-1 8-HQC or 500 mg·L-1 8-HQC) during cold storage at 10.5°C and 90% relative humidity. The solutions were then replaced with tap water and the cut flowers remained in cold storage for 12 days. For biochemical characterization of peroxidase activity and total protein content, tissue samples (sepals, petals, stems, and bracts) were collected and analyzed at 0, 4, 8, and 12 days after treatment. There was an increase in peroxidase activity in petals, stems, and bracts and a decrease in total protein content, regardless of the treatment used. In this experiment, therefore, differences in peroxidase activity and total protein content due to treatments with 8-HQC or chlorine were not identified.