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排序方式: 共有63条查询结果,搜索用时 578 毫秒
31.
The aim of this study was to investigate the nephroprotective and antioxidant property of Manasamitra vatakam (MMV) against aluminum (Al)-induced toxicity in rats. The kidney function marker parameters such as serum urea, uric acid, and creatinine were significantly increased in Al-treated rats as compared with controls. Similarly, the antioxidant enzyme activities such as superoxide dismutase, glutathione S-transferase, Na+/K+-ATPase and Mg-ATPase, reduced glutathione were also found significantly increased in Al-treated rats. A significantly decreased level of these parameters was observed in the MMV (orally 100?mg?kg?1 body weight)-treated group along with a reduced level of malonaldehyde, molecular chaperones of an antioxidative stress protein, and mRNA expression of HSP70. The biochemical observations were also supported by histopathological observations. Thus, this study supports the nephroprotective and antioxidant activities of MMV. 相似文献
32.
Socio-economic development of mankind and well-being depend on the environment and the way in which development influences the environment. Thus, environment and development are interdependent. In fact, economic development is closely linked with the development of resources. These resources can be classified into three categories: public goods, semi-public goods (also known as common property resources) and private goods. In poor countries common property resources make a valuable contribution to the sustainable livelihoods of rural populations. The impact of globalisation on the commons shows various patterns of ownership, control, use and misuse. The commons were subjected to degradation as well as conservation in the process of centralized management in India. After the reform period, the administration of natural resources was given significant attention by specialized departments such as the Forest Department and the Revenue Department. All the land, apart from private land, was regarded as state property and controlled by the state. This paper highlights the need to examine the common property resources sector in the context of wider economic policy reform processes in the Indian economy. 相似文献
33.
Mining disasters caused and controlled by mankind: The case for coal mining and other minerals 总被引:1,自引:0,他引:1
Raja V Ramani 《Natural resources forum》1995,19(4):309-319
In Part I of this paper, published in the August 1995 issue of Natural Resources Forum, a review of several mining disasters around the world established the complex nature of their causation and their catastrophic effects. The involvement of human beings, either through acts of commission or omission, was highlighted. In Part 2, a discussion of the various approaches to disaster control, mostly as practised in the USA, is presented. A systems approach to disaster prevention incorporating elements of hazard identification, mine design, emergency response and post-emergency audit is presented . 相似文献
34.
Raja Vijayakumar Dutta Sayantani Murugesan Pramila Moses J. A. Anandharamakrishnan C. 《Environmental Chemistry Letters》2023,21(2):839-864
Environmental Chemistry Letters - Conventional treatments of food waste such as incineration, landfilling, and composting require large land areas and induce contamination in air, soil,... 相似文献
35.
In this work, a novel multipurpose Faujasite (FAU) zeolite composite membrane was fabricated by in-situ hydrothermal method to separate different solute molecules such as vanillic acid, phenol, and brilliant green from the aqueous solution. The coal fly ash based ceramic substrate was synthesized and used as substrate for preparing the zeolite composite membrane. The X-ray diffraction (XRD) pattern confirmed the crystalline nature of membranes and the presence of Quartz and hematite in the composite membrane. The presence of Si-O and Al-O in zeolite coated composite membrane was confirmed by Fourier Transform infrared spectroscopy (FTIR) analysis. Scanning electron microscope (SEM) analysis showed the porous structure and 8.34 μm thickness of zeolite coating on membrane. The isoelectric point of composite membrane was observed at pH 2.07 through zeta potential analysis. Brunauer-Emmett-Teller (BET) surface area, average pore volume and pore diameter of zeolite composite membrane were estimated as 6.406 m2/gm, 0.0070 cm3/gm, and 4.371 nm, respectively. The hydraulic pore radius and porosity of composite membranes were 27.7 nm and 20.1%. The maximum separation efficiency of FAU zeolite composite membrane towards vanillic acid, phenol and brilliant green was estimated as 78.67%, 89.13%, and 94.28%, respectively, for 200 mg/L feed concentration at 276 kPa applied pressure. The results obtained in this study reveals that the multipurpose FAU zeolite composite membrane fabricated in this study can be effectively used for separation of various solutes molecules present in the wastewater. 相似文献
36.
Jean-Sauveur Ay Raja Chakir Julie Le Gallo 《Environmental Modeling and Assessment》2017,22(2):129-145
The objective of this paper is to compare the predictive accuracy of individual and aggregated econometric models of land-use choices. We argue that modeling spatial autocorrelation is a comparative advantage of aggregated models due to the smaller number of observation and the linearity of the outcome. The question is whether modeling spatial autocorrelation in aggregated models is able to provide better predictions than individual ones. We consider a complete partition of space with four land-use classes: arable, pasture, forest, and urban. We estimate and compare the predictive accuracies of individual models at the plot level (514,074 observations) and of aggregated models at a regular 12 × 12 km grid level (3,767 observations). Our results show that modeling spatial autocorrelation allows to obtain more accurate predictions at the aggregated level when the appropriate predictors are used. 相似文献
37.
Baowen Lou Diego Maria Barbieri Marco Passavanti Cang Hui Akshay Gupta Inge Hoff Daniela Antunes Lessa Gaurav Sikka Kevin Chang Kevin Fang Louisa Lam Brij Maharaj Navid Ghasemi Yaning Qiao Solomon Adomako Ali Foroutan Mirhosseini Bhaven Naik Arunabha Banerjee Fusong Wang Andrew Tucker Zhuangzhuang Liu Kasun Wijayaratna Sahra Naseri Lei Yu Hao Chen Benan Shu Shubham Goswami Prince Peprah Amir Hessami Montasir Abbas Nithin Agarwal 《Ambio》2022,51(3):531
As largely documented in the literature, the stark restrictions enforced worldwide in 2020 to curb the COVID-19 pandemic also curtailed the production of air pollutants to some extent. This study investigates the perception of the air pollution as assessed by individuals located in ten countries: Australia, Brazil, China, Ghana, India, Iran, Italy, Norway, South Africa and the USA. The perceptions towards air quality were evaluated by employing an online survey administered in May 2020. Participants (N = 9394) in the ten countries expressed their opinions according to a Likert-scale response. A reduction in pollutant concentration was clearly perceived, albeit to a different extent, by all populations. The survey participants located in India and Italy perceived the largest drop in the air pollution concentration; conversely, the smallest variation was perceived among Chinese and Norwegian respondents. Among all the demographic indicators considered, only gender proved to be statistically significant.Supplementary InformationThe online version contains supplementary material available at 10.1007/s13280-021-01574-2. 相似文献
38.
Ramasamy Rathinamoorthy Subramanian Raja Balasaraswathi 《Environmental science and pollution research international》2021,28(31):41596-41611
Environmental Science and Pollution Research - Microfiber pollution is one of the recent threats to sustainability. Due to the increased use of synthetic textiles, microplastic fiber release to the... 相似文献
39.
Y. Raja Sekhar K. V. Sharma Subhash Kamal 《Environmental science and pollution research international》2016,23(10):9411-9417
The solar flat plate collector operating under different convective modes has low efficiency for energy conversion. The energy absorbed by the working fluid in the collector system and its heat transfer characteristics vary with solar insolation and mass flow rate. The performance of the system is improved by reducing the losses from the collector. Various passive methods have been devised to aid energy absorption by the working fluid. Also, working fluids are modified using nanoparticles to improve the thermal properties of the fluid. In the present work, simulation and experimental studies are undertaken for pipe flow at constant heat flux boundary condition in the mixed convection mode. The working fluid at low Reynolds number in the mixed laminar flow range is undertaken with water in thermosyphon mode for different inclination angles of the tube. Local and average coefficients are determined experimentally and compared with theoretical values for water-based Al2O3 nanofluids. The results show an enhancement in heat transfer in the experimental range with Rayleigh number at higher inclinations of the collector tube for water and nanofluids. 相似文献
40.
Ecosystem-based approaches to aquaculture integrate environmental concerns into planning. Social–ecological systems research can improve this approach by explicitly relating ecological and social dynamics of change at multiple scales. Doing so requires not only addressing direct effects of aquaculture but also considering indirect factors such as changes in livelihood strategies, governance dynamics, and power relations. We selected the community of Puerto Morazán, Nicaragua as a case study to demonstrate how the introduction of small-scale aquaculture radically transformed another key livelihood activity, lagoon shrimp fishing, and the effects that these changes have had on lagoons and the people that depend on them. We find that shrimp aquaculture played a key role in the collapse, in the 1990s, of an existing lagoon common-property management. Shrimp aquaculture-related capital enabled the adoption of a new fishing technique that not only degraded lagoons but also led to their gradual privatization. The existence of social ties between small-scale shrimp farmers and other community members mitigated the impacts of privatization, illustrating the importance of social capital. Since 2008, community members are seeking to communally manage the lagoons once again, in response to degraded environmental conditions and a consolidation of the shrimp industry at the expense of smaller actors. This research shows that shrimp aquaculture intersects with a complex set of drivers, affecting not only how ecosystems are managed but also how they are perceived and valued. Understanding these social–ecological dynamics is essential to implement realistic policies and management of mangrove ecosystems and address the needs of resource-dependent people. 相似文献