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Pinheiro Greetta,Raj Aditya,Minz Sonajharia,Choudhury Tanupriya,Um Jung-Sup 대한공간정보학회 2024 Spatial Information Research Vol.32 No.3
The flood occurrence frequency has increased over the years due to climate change, and various state-of-the-art methods have been proposed for flood mapping using Synthetic Aperture Radar (SAR) data. However, whenever there are similarities in the radar backscatter values of permanent water bodies and sand areas, the riverine floods are generally ignored due to high computational complexity. This paper proposes a multi-source data fusion-based model for mapping the Kosi river floodplain areas in the Supaul district of Bihar, India, using both VV and VH bands of Sentinel-1 SAR imagery. The proposed model involves image pre-processing, classification, and post-processing of results to obtain the flood map. The combination of Otsu automatic threshold detection and change detection methods is used for reducing the overestimation of flooded pixels while identifying flood-prone areas. The post-processing involves the identification of high and low-confidence flood regions, riverine floods, generation of flood maps, and estimation of flooded areas. The impact of the flood on the nearby area is captured using multi-temporal images of the Supaul district. The pre-processing, visualizing, processing, and analysis of the results are carried out in Google Earth Engine. The proposed method is suitable for identifying flooding in both nonpermanent and permanently low backscattering areas.
Cardiovascular Effect of Diosgenin in Ovariectomized Rats
Ilmara Cecilia Pinheiro de Silva Morais,Iris Jordaˆnia Luz Moura,Carla Kelly Barroso Sabino,Lucas Antonio Duarte Nicolau,Fabiana de Moura Souza,Jose´ Couras da Silva-Filho,Rita de Ca´ssia Meneses Oliv 한국식품영양과학회 2019 Journal of medicinal food Vol.22 No.3
Diosgenin is a phytoestrogen and a constituent of Dioscorea. It has several biological effects, and some of them are anti-inflammatory, antidiabetic, antitumor, and vasodilatory. The present study investigated both the vasorelaxing and antioxidant mechanisms of diosgenin in isolated rat aortic rings. Female rats weighing 200–220 g were subjected to sham or OVX operations at 8 weeks of age. Ovariectomy was performed for menopause induction after anesthesia. Diosgenin (10−9 M–3 × 10−4 M) produced a concentration-dependent relaxation in aortic rings precontracted with phenylephrine (1 μM), exhibiting Emax value of 55.34% ± 7.7% (in endothelium-intact rings) and Emax value of 30.30% ± 5.7% (in endothelium-denuded rings). In the endothelium-intact rings, the vasorelaxing effect of diosgenin was reduced by NG-nitro-l-arginine methyl ester (L-NAME) (100 μM), atropine (1 μM), indomethacin (10 μM), 1H-[1,2,4]oxadiazolo-[4,3-a]quinoxalin-1-one (ODQ) (10 μM), 4-aminopyridine (1 mM), tetraethylammonium (3 mM), glibenclamide (10 μM), apamin (10 μM), and Tiron (1 μM). Diosgenin (10−5 M) inhibited the contractions induced by cumulative addition of phenylephrine (10−9–10−5 M). The 28-days treatment with diosgenin (50 mg/kg, v.o.) did not imply changes in the myeloperoxidase parameter, but increased significantly, levels of glutathione, superoxide dismutase, and nitric oxide, as well as reduced the concentration of malondialdehyde related to lipid peroxidation. Our results suggest that diosgenin induced relaxation in aortic rings via an endothelium-dependent pathway, which involves the EDRF, the opening of potassium channels and antioxidant action.
Antimicrobial peptides of the genus Capsicum: a mini review
Oliveira Arielle Pinheiro Bessiatti Fava,Resende Larissa Maximiano,Rodrigues Rosana,de Oliveira Mello Érica,Taveira Gabriel Bonan,de Oliveira Carvalho André,Gomes Valdirene Moreira 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.4
Antimicrobial peptides (AMPs) have been characterized in various organs and plant species. However, few studies have investigated AMPs in the genus Capsicum , especially their biological activities and mechanism of action. AMPs are small proteins isolated primarily from plants and animals. AMPs are of great interest to researchers because of their potent antimicrobial activity due to their ability to interact with cell membranes. While some AMPs participate in innate immune response by providing a rapid line of defense against infection, others may bolster plant defense against certain pests and pathogens. The genus Capsicum contains a myriad of AMPs involved in plant defense with the potential for new antimicrobial molecules. In recent years, our group and others have isolated and characterized AMPs from seeds, fruits, leaves and roots of Capsicum plants. Herein, we describe the diff erent AMP families, like defensins, lipid transfer proteins (LTPs), thionins, proteinase inhibitors, and others, present in the genus Capsicum . We also discuss the current knowledge of their antimicrobial activity, mechanism of action, and possible uses as antimicrobial molecules and in plant biotechnology.
L.S.Pinheiro,M.L.A.Temperini 한국물리학회 2002 Current Applied Physics Vol.2 No.2
2-Mercaptopyrimidine (2MPy) forms a two-dimensional planar lattice on Au(111). This structure is able to intercalate guestmolecules such as the oligopyridines. To test the ability of the 2MPy lattice as a host able to intercalate a variety of moleculesregardless of their geometry and electronic structures, some arenes and polyenes were analyzed as possible guests. Benzene,naphthalene, azulene, phenanthrene, anthracene, biphenyl, uorobenzene and durene were selected to coadsorb with 2MPy on thesurfaces. The experimental data show that the arenes and polyenes selected coadsorb with 2MPy on Au(11) under dened ex-perimental conditions, forming a mixed layer with stoichiometry of 2:1 in thiol:guest. The STM contrast observed for the guestmolecules is compared to the experimental and theoretical results already published.. 2002 Elsevier Science B.V. All rights re-served.
( Franciane Cabral Pinheiro ),( Vandreza Cardoso Bortolotto ),( Stifani Machado Araujo ),( Marcia Rosula Poetini ),( Carla Pohl Sehn ),( Jose S. S. Neto ),( Gilson Zeni ),( Marina Prigol ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.7
This study aimed to evaluate the antimicrobial activity of 2-phenylethynyl-butyltellurium (PEBT) in Escherichia coli and the relation to its pro-oxidant effect. For this, we carried out the disk diffusion test, minimum inhibitory concentration (MIC) assay, and survival curve analysis. We also measured the level of extracellular reactive oxygen species (ROS), activity of the antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT), and level of nonprotein thiols (NPSH). PEBT at 1.28 and 0.128 mg/disk exhibited antimicrobial capability in the disk diffusion test, with an MIC value of 1.92 mg/ml, whereas PEBT at 0.96, 1.92, and 3.84 mg/ml inhibited bacterial growth after a 9-h exposure. PEBT at 3.84, 1.92, and 0.96 mg/ml increased extracellular ROS production, decreased the intracellular NPSH level, and reduced the SOD and CAT activities. Glutathione or ascorbic acid in the medium protected the bacterial cells from the antimicrobial effect of PEBT. In conclusion, PEBT exhibited antimicrobial activity against E. coli, involving the generation of ROS, oxidation of NPSH, and reduction of the antioxidant defenses in the bacterial cells.
Veroˆnica Assalin Zorgetto-Pinheiro,David Johane Machate,Priscila Silva Figueiredo,Gabriela Marcelino,Priscila Aiko Hiane,Arnildo Pott,Rita de Ca´ssia Avellaneda Guimara˜es,Danielle Bogo 한국식품영양과학회 2022 Journal of medicinal food Vol.25 No.4
The aim of this article was to review experimental and clinical studies regarding the use of omega-3 fatty acids on the prevention and control of chronic inflammatory diseases with autoimmune background through the gut microbiota modulation. For this, natural omega-3 sources are presented emphasizing the importance of a healthy diet for the body's homeostasis and the enzymatic processes that these fatty acids go through once inside the body. The pathogenesis of ulcerative colitis and rheumatoid arthritis are revisited under the light of the gut microbiota dysbiosis approach and how those fatty acids are able to prevent and control these two pathological conditions that are responsible for the global chronic burden and functional disability and life-threatening comorbidities if not treated properly. As a matter of reflection, as we are living a pandemic crisis owing to COVID-19 infection, we present the potential of omega-3 in preventing a poor prognosis once they contribute to balancing the immune system modulation the inflammatory process.
클라우디우 코스타 피녜이루(Claudio Costa Pinheiro),나지원(번역자) 서울대학교 아시아연구소 2016 아시아리뷰 Vol.6 No.1
지역학은 특정 공간에 대한 학제적 연구에 전념하는 지식인의 역량을 개발해주지만 동시에 학자들을 자족하는 현실에 가둬놓을 수도 있다. 또한 북대서양에서 생산된 지식이 이 분야를 압도하는 현실을 정당화하고 결과적으로 탈식민 시대 주변부들 간의 지적 관찰을 저해한다. 이 글은 아시아에 대한 라틴 아메리카의 호기심을 역사적으로 개괄하면서 북반구(구미)의 분석틀이 가진 패권적 지위에 의문을 제기하며 아시아 지역학을 탈지역화하는 데에 일조한다. 그 호기심은 여러 단계를 거쳤다. 첫째, 처음에는 식민제국의 관점을 모방하는 오리엔탈리즘적 접근법을 통해, 이후에는 개발과 근대성 이론을 통해 정의되었다. 둘째, 19세기에는 귀족적이고 두서없는 호기심에서 출발했지만 제2차 세계대전 이후에는 전문적인 학문의 관심 대상이 되었다. 끝으로 세계 주변부 사이의 산발적인 연관관계에서 근대화의 대안적 모델로 변화했다. 필자는 남반구(Global South), 특히 라틴아메리카와 아프리카에서 아시아 지역연구의 제도화를 지원함으로써 이 분야가 진일보할 수 있고 아시아 지역학이 탈중심화될 수 있으며 학제 간 논의가 촉진될 수 있다고 주장한다.