scholarly journals CARACTERIZAÇÃO FÍSICO-MECÂNICA DA MADEIRA DE Dodonaea viscosa Jacq.

2022 ◽  
Vol 7 (1) ◽  
pp. 61
Author(s):  
Rodrigo Otávio Schneider Souza ◽  
Laura Hoffmann de Oliveira ◽  
Luciane Gorski ◽  
Guilherme Valcorte ◽  
Roberta Rodrigues Roubuste ◽  
...  
Keyword(s):  

O uso da madeira de espécies nativas pode ser visto como alternativa de renda para produtores rurais, no entanto ainda existe uma grande lacuna a ser preenchida pelas instituições de pesquisa a respeito das características dessa a fim de embasar sua utilização. Neste sentido, o presente estudo objetivou caracterizar as propriedades físico-mecânicas da madeira de Dodonaea viscosa Jacq. Para tanto, foram utilizadas neste estudo exemplares da espécie Dodanaea viscosa, conhecida popularmente como faxina vermelha ou vassoura-vermelha, com aproximadamente quinze anos de idade. Os corpos de prova foram confeccionados seguindo as dimensões descritas nas respectivas normas de cada ensaio. Após a confecção, os mesmos foram acondicionados em câmara climatizada a uma temperatura de 20°C e 65% de umidade relativa, onde permaneceram até atingirem umidade de equilíbrio de 12%.  Posteriormente, foram avaliados: massa específica aparente, flexão estática, flexão dinâmica e dureza Janka.  A partir dos resultados obtidos neste estudo, pode-se perceber que a madeira de Dodonaea viscosa pode ser classificada como de alta densidade, possui bom desempenho nas propriedades mecânicas, como módulo de ruptura, módulo de elasticidade, dureza Janka e resistência ao impacto. Além disso, apresenta alto valor de cota dinâmica, caracterizando-a como uma madeira resiliente.

Author(s):  
Marco, A. Márquez-Linares ◽  
Jonathan G. Escobar--Flores ◽  
Sarahi Sandoval- Espinosa ◽  
Gustavo Pérez-Verdín

Objective: to determine the distribution of D. viscosa in the vicinity of the Guadalupe Victoria Dam in Durango, Mexico, for the years 1990, 2010 and 2017.Design/Methodology/Approach: Landsat satellite images were processed in order to carry out supervised classifications using an artificial neural network. Images from the years 1990, 2010 and 2017 were used to estimate ground cover of D. viscosa, pastures, crops, shrubs, and oak forest. This data was used to calculate the expansion of D. viscosa in the study area.Results/Study Limitations/Implications: the supervised classification with the artificial neural network was optimal after 400 iterations, obtaining the best overall precision of 84.5 % for 2017. This contrasted with the year 1990, when overall accuracy was low at 45 % due to less training sites (fewer than 100) recorded for each of the land cover classes.Findings/Conclusions: in 1990, D. viscosa was found on only five hectares, while by 2017 it had increased to 147 hectares. If the disturbance caused by overgrazing continues, and based on the distribution of D. viscosa, it is likely that in a few years it will have the ability to invade half the study area, occupying agricultural, forested, and shrub areas


Author(s):  
Naira Nayeem ◽  
Syed Mohammed Basheeruddin Asdaq ◽  
Abdulhakeem S. Alamri ◽  
Walaa F. Alsanie ◽  
Majid Alhomrani ◽  
...  

Fitoterapia ◽  
2018 ◽  
Vol 126 ◽  
pp. 65-68 ◽  
Author(s):  
Bianca J. Deans ◽  
Wesley J. Olivier ◽  
David Girbino ◽  
Alex C. Bissember ◽  
Jason A. Smith

2021 ◽  
Author(s):  
Hina Gul ◽  
Muhammad Awais ◽  
Salina Saddick ◽  
Falak Sher Khan ◽  
Muhammad Gulfraz ◽  
...  

Abstract Dodonaea viscosa L. Jacq. is an evergreen shrub and native to Asia, Africa and Australia. It has been used as traditional medicine in different countries. The foremost objective of the current study was to discover protective potential of D. Viscosa flowers Methanol (DVM) and Chloroform (DVC) extracts against CCL4 induced toxicity in mice. This study was intended to identify phytochemicals through HPLC, GCMS and FT-IR as well as in vitro antioxidant and in vitro antituberculosis activity. Our comprehensive findings indicate that Dodonaea viscosa is valuable and widespread herbal medicines through therapeutic potentials for curing various ailments. Dodonaea viscosa flowers are found to have protective effect against oxidative stress produced by CCL4 in liver, kidney and spleen. The level of hepatic enzymes (ALP, AST ALT and Direct bilirubin), hematological parameters (RBCs, WBCs and Platelets), total protein and liver antioxidant enzymes (SOD, GPx and CAT) were restored by the intake of DV extracts after decline in levels by CCL4. Histopathological results discovered the defensive effect of 300mg/kg of DVM extract against CCL4 induced damage, thus having improved protective effect as compared to DVC and control. As a result of analysis total flavonoids and total phenolics were also revealed. Phytochemical investigation by HPLC identified gallic acid, epicatechin, cumeric acid, flavonoids while Oleic acid (Octadecenoic acid) (C18H34O2), Stearic acid (C18H36O2), Ricinoleic acid (C18H34O3) and Cedrol (C15H26O) was estimated by GCMS. DVM extract exhibited resistance against in vitro Mycobacterium tuberculosis strains. This study proposed that protective effect of DV against oxidative damage induced in Liver, Kidney and Spleen can possibly be correlated to their antioxidant as well as free radical scavenging property.


2021 ◽  
Author(s):  
Xuemei Wang ◽  
Bangguo Yan ◽  
Liangtao Shi ◽  
Gangcai Liu

Abstract Biotic plant-soil feedback has been widely studied, and may be particularly important in resource-poor areas. However, the roles of soil nutrient cycling in affecting plant growth in this process still remained unclear. The aim of this study was to explore the roles of soil biota in regulating nutrient cycling by conducting a two-phase feedback experiment in a dry-hot valley, with a conditioning phase during which there were Dodonaea viscosa or no D. viscosa growing in the soil, and a feedback phase in which the effect of the conditioned soil biota on D. viscosa performance was measured. The growth of D. viscosa significantly reduced soil N after the conditioning phase. However, D. viscosa showed a positive plant-soil feedback. In the feedback phase, the D. viscosa conditioned soil promoted the stem diameter, leaf area, and leaf dry mass content of D. viscosa. Total biomass was also significantly higher in D. viscosa conditioned soil than that in not conditioned soil. In contrast, soil sterilization had a negative effect on the growth of D. viscosa, with a significant reduction in plant biomass, especially in D. viscosa conditioned soil, and soil sterilization significantly increased the root: shoot biomass ratio and litter mass. Furthermore, we showed that although the biota-driven changes in enzyme activities correlated with the leaf N and P amount especially P amount, the enzyme activity was not the main reason to promote D. viscosa growth in the conditioned soil.


Tetrahedron ◽  
2016 ◽  
Vol 72 (49) ◽  
pp. 8036-8041 ◽  
Author(s):  
Lai-Bin Zhang ◽  
Hai-Bing Liao ◽  
Hai-Yan Zhu ◽  
Mei-Hua Yu ◽  
Chun Lei ◽  
...  

1986 ◽  
Vol 25 (8) ◽  
pp. 1967-1969 ◽  
Author(s):  
Kusum Sachdev ◽  
Dinesh K. Kulshreshtha
Keyword(s):  

Phytomedicine ◽  
2014 ◽  
Vol 21 (2) ◽  
pp. 131-140 ◽  
Author(s):  
Hamid Ali ◽  
Nurul Kabir ◽  
Akhtar Muhammad ◽  
Mohammad Raza Shah ◽  
Syed Ghulam Musharraf ◽  
...  
Keyword(s):  

2018 ◽  
Vol 10 (12) ◽  
pp. 4774 ◽  
Author(s):  
Jun Pei ◽  
Wei Yang ◽  
Yangpeng Cai ◽  
Yujun Yi ◽  
Xiaoxiao Li

The sparse and fragile vegetation in the arid-hot valley is an important indicator of ecosystem health. Understanding the correlation between this vegetation and its environment is vital to the plant restoration. We investigated the differences of soil moisture and fertility in typical vegetation (Dodonaea viscosa and Pinus yunnanensis) under a range of elevations, slopes, and aspects in an arid-hot valley of China’s Jinsha River through field monitoring and multivariate statistical analysis. The soil moisture differed significantly between the dry and rainy seasons, and it was higher at high elevation (>1640 m) and on shade slopes at the end of the dry season. Soil fertility showed little or no variation among the elevations, but was highest at 1380 m. Dodonaea viscosa biomass increased, then decreased, with increasing elevation on the shade slopes, but decreased with increasing elevation on the sunny slopes. On the shade slopes, Pinus yunnanensis biomass was higher at low elevations (1640 m) than it was on sunny slopes, but lower at high elevation (1940 m) on the sunny slopes. We found both elevation and soil moisture were significantly positively correlated with P. yunnanensis biomass and negatively correlated with D. viscosa biomass. Thus, changes in soil moisture as a function of elevation control vegetation restoration in the arid-hot valley. Both species are adaptable indigenous plants with good social and ecological benefits, so these results will allow managers to restore the vegetation more effectively.


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