scholarly journals O PAPEL DA JUVENTUDE CAMPONESA NA CONSTRUÇÃO DE ECONOMIAS DE RESISTÊNCIA NO SEMIÁRIDO NORDESTINO/The role of peasant youth in the construction of resistance economies in the northeastern semi-arid region

REVISTA NERA ◽  
2017 ◽  
pp. 144-156
Author(s):  
Gabriel Troilo ◽  
Maria Nalva Rodrigues Araújo

O objetivo do presente trabalho é apresentar as reflexões promovidas pelas organizações sociais do campo e por pesquisadores da questão agrária sobre a forma como as comunidades camponesas do semiárido nordestino se articulam para garantir as condições de produção e subsistência em meio à lógica de livre mercado capitalista, destacando o papel da juventude do campo neste processo. Para tanto foram analisadas as experiências de produção e mercado das comunidades camponesas do semiárido baiano, levando em conta a dinâmica econômica, os enfrentamentos, potencialidades e estratégias de resistência das mesmas frente o avanço do mercado capitalista na atualidade. As ações da juventude do campo na estruturação de economias de resistência, seja pelo associativismo e cooperativismo rural, pela formação de mercados camponeses e ocupação do mercado capitalista tem possibilitado a viabilidade da produção camponesa frente às pressões do modelo de produção agrícola dominante. Tais estratégias tem gerado importantes avanços para o campo no semiárido nordestino, e demonstram os resultados da luta política da juventude do campo pela perpetuação do modo de vida camponês e pela construção da soberania alimentar e territorial das comunidades sertanejas. 

2020 ◽  
pp. 1-14
Author(s):  
Maiara B. Ramos ◽  
Fabricio C. Diniz ◽  
Humberto A. de Almeida ◽  
Gilbevan R. de Almeida ◽  
Anderson S. Pinto ◽  
...  

Abstract Unlike well-known global patterns of plant species richness along altitudinal gradients, in the mountainous areas of the Brazilian Caatinga, species richness and diversity reach their maxima near mountain tops. The causes of this unusual pattern are not well understood, and in particular the role of edaphic factors on plant community assembly along these gradients has not been investigated. Our goal was to assess the role of edaphic factors (fertility and soil texture) on plant community composition and structure on two mountains of the Brazilian semi-arid region. In 71 plots (Bodocongó site, twenty-one 200-m2 plots, 401–680 m asl; Arara site, fifty 100-m2 plots, 487–660 m asl) we recorded 3114 individuals representing 61 plant species; in addition, at each plot we collected composite soil samples from 0–20 cm depth. Significant altitude-related changes were observed both for community structure and composition, and edaphic variables. A canonical correspondence analysis allowed the distinction of two groups of plots according to species abundances, indicating a preferential habitat distribution of species depending both on altitude and soil variables. Although soil fertility was lowest at the highest altitudes, these areas had high richness and diversity. Conversely, the more fertile foothills were characterized by the dominance of generalist pioneer species. Despite the relatively short altitudinal range that characterizes the studied mountains, this study elucidates the role of edaphic factors on the floristic composition and species richness patterns on the mountains of the Brazilian semi-arid region.


2013 ◽  
Vol 16 (1) ◽  
pp. 12-23 ◽  
Author(s):  
Tetsuji Suzuki ◽  
Takeshi Ohta ◽  
Yasuhiro Izumi ◽  
Luke Kanyomeka ◽  
Osmund Mwandemele ◽  
...  

2020 ◽  
Vol 552 ◽  
pp. 111-121 ◽  
Author(s):  
Sedigheh Maleki ◽  
Farhad Khormali ◽  
Mohsen Bagheri Bodaghabadi ◽  
Jahangir Mohammadi ◽  
Dirk Hoffmeister ◽  
...  

Author(s):  
Takoua Ben Hlel ◽  
Feten Belhadj ◽  
Fatih Gül ◽  
Muhammed Altun ◽  
Ayşe Şahin Yağlıoğlu ◽  
...  

Background:: Luffa cylindrica is a plant that is widely distributed in Africa and Asia and it can be grown in regions with tropical or subtropical climates. Few patents dealt with Loofah biological properties, including some functional foods formulated from its leaves. Objective:: This study aimed to structurally and functionally characterize the bioactive compounds of L. cylindrica leaves grown in two different environments. Methods:: The extracts of L. cylindrica leaves collected from two Tunisian locations: Essouasi (LE), a semi-arid region and Medenine (LM) an arid region, were investigated for their phenolic compounds and fatty acids using HPLC/TOF-MS and GCMS techniques respectively. Furthermore, the antioxidant capacity was evaluated with DPPH, Chelating effect, Hydroxyl radical and Superoxide anion scavenging activities while the anticancer activity against HeLa cell lines was assessed using xCELLigence real time cell analyzer and lactate dehydrogenase cytotoxicity assay. Results:: The antiproliferative capacity of both extracts was time and dose-dependent with LE presenting the lowest HeLa cell index (CI = 0.035 ± 0.018, 250 μg/ml). LE also showed the best cytotoxic capacity (56.49 ± 0.8%) and antioxidant potential (IC50 = 54.41 ± 1.12 μg/ml for DPPH and 12.12 ± 0.07 μg/ml for chelating effet). 14 phenolic compounds were detected in LE with ferulic acid being the major compound (5128.5 ± 4.09 μg Phenols/g) while LM had only 6 phenolics. GCMS analysis showed the presence of omega-3 fatty acids in LE. Conclusions:: Our findings suggest that L. cylindrica leaves, especially when collected from semi-arid regions, are promising for formulating nutraceuticals of interest.


2021 ◽  
Vol 24 ◽  
pp. e00367
Author(s):  
Patrick Filippi ◽  
Stephen R. Cattle ◽  
Matthew J. Pringle ◽  
Thomas F.A. Bishop

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