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Growth and utilization of different phenolic acids present in olive mill wastewater (OMW) by Azotobacter chroococcum were studied in chemically defined media. Growth and utilization of phenolic acids were only detected when the microorganism was cultured on p-hydroxybenzoic acid at concentration from 0.01% to 0.5% (w/v) and protocatechuic acid at concentration from 0.01% to 0.3% (w/v) as sole carbon sources suggesting that only these phenolic compounds could be utilized as a carbon source by A. chroococcum. Moreover when culture media were added with a mixture of 0.3% of protocatechuic acid and 0.3% p-hydroxybenzoic acid, the microorganism degradated in first place protocatechuic acid and once the culture medium was depleted of this compound, the degradation of p-hydroxybenzoic acid commenced very fast. 相似文献
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Levels of organochlorine pesticides in Amazon turtle (Podocnemis unifilis) in the Xingu River,Brazil
Marina Teófilo Pignati Larissa Costa De Souza Rosivaldo de Alcântara Mendes Marcelo de Oliveira Lima Wanderlei Antonio Pignati Juarez Carlos Brito Pezzuti 《Journal of environmental science and health. Part. B》2013,48(12):810-816
AbstractDue to the toxicity and high environmental persistence of organochlorine pesticides in aquatic organisms, turtles have been studied as environment biomonitors. These animals are important sources of protein for the riverside and indigenous peoples of the Brazilian amazon. In the present study, organochlorine pesticide contamination was investigated in Podocnemis unifilis. Liver, muscle and fatty tissue samples were removed from 50 specimens collected from five sampling points located in the Xingu River basin. Fourteen organochlorine pesticides were analysed via gas chromatography with an electron capture detector (CG-ECD). Eight organochlorine pesticides were detected with average concentrations of ∑DDT, ∑Endossulfan and ∑HCH which were 26.17?±?26.35, 14.38?±?23.77 and 1.39?±?8.46?ng g?1 in moisture content, respectively. DDT compounds were the most predominant, with a greater concentration of pp′-DDT in the liver and pp′-DDD in the muscle. Significant differences were noted between the types of tissues studied, and the concentration of OCPs varied between sampling sites. 相似文献
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Alves RR Vieira KS Santana GG Vieira WL Almeida WO Souto WM Montenegro PF Pezzuti JC 《Environmental monitoring and assessment》2012,184(11):6877-6901
For many millennia humans and reptiles have interacted, but the attitude of humans towards these animals has depended on culture, environment, and personal experience. At least 719 reptile species are known to occur in Brazil and about 11% of this fauna has been exploited for many different purposes, including bushmeat, leather, ornamental and magic/religious uses, and as folk medicines. Brazil can therefore serve as an interesting case study for better understanding reptile use by human societies, and the present paper catalogues some of the reptile species being used in Brazil and discusses implications for their conservation. A literature review indicated that 81 reptile species are culturally important in this country, with 47 (58%) species having multiple uses, 54 being used for medicinal purposes, 38 as food, 28 for ornamental or decorative purposes, 20 used in magic/religious practices, 18 as pets, and 40 are commonly killed when they come into contact with humans. Regarding their conservation status, 30 (37.5%) are included on State's Red List, Brazilian Red List or the IUCN Red List. There are many forms of interaction between reptiles and humans in Brazil-although most of them are quite negative in terms of wildlife conservation-which reinforces the importance of understanding such uses and interactions in the context of protecting reptiles in Brazil. A better understanding of the cultural, social, and traditional roles of these reptiles is fundamental to establishing management plans for their sustainable use. 相似文献
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Hugh Drummond Roxana Torres Cristina Rodríguez Juarez Sin-Yeon Kim 《Behavioral ecology and sociobiology》2010,64(4):647-655
In multitudinous breeding colonies, kin interactions could go unnoticed because we are unaware of the kinship among adults
we observe. Evidence of cooperation and competition between close adult kin in a blue-footed booby colony was sought by analyzing
patterns of natal dispersal and proximity of nests. Male and female recruits nested closer to their own natal sites than to
their parents’ current sites. Males (only) dispersed less far when both parents were present than when no parent or one parent
was present, but not selectively close to fathers versus mothers when these were divorced. Neither parental presence nor parental
proximity affected breeding success of recruits of either sex. Although distances between the nests of simultaneously recruiting
broodmates were unrelated to their sex, males dispersed 13.1 m less when a sister was present than when a brother was present.
Neither sex was affected in its dispersal distance by the presence or hatching order/dominance of a broodmate. Neither sex
was affected in its breeding success by the presence versus absence of a broodmate, although female success increased with
proximity of their brothers. Parents and sisters may actively or passively help males establish their first territories near
their natal sites and nearby brothers may help females in their first breeding attempts; otherwise, boobies do not influence
each other’s natal dispersal and first breeding success. It appears that boobies do not nest selectively close to or far from
their parents, offspring, or broodmates. Why there is apparently so little cooperation and altruism between close adult relatives
in booby colonies is puzzling. 相似文献
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David G. McGrath Alcilene Cardoso Oriana T. Almeida Juarez Pezzuti 《Environment, Development and Sustainability》2008,10(5):677-695
A regional experiment in co-management is underway in the Lower Amazon that is developing the basic policy and institutional
elements for an ecosystem-based approach to floodplain management. This initiative grew out of the grassroots movement of
floodplain communities who, concerned with excessive commercial fishing pressure on local fisheries, took control of local
lakes and implemented collective agreements regulating fishing activity. This paper describes the main elements of the evolving
regional management system. This process has focused on four main dimensions of floodplain settlement and resource use: development
of sustainable management systems for floodplain resources, policies and institutions for fisheries co-management, collective
agreements for grazing cattle on floodplain grasslands, and a land tenure policy consistent with the objectives of the evolving
co-management system. Over the last year INCRA, the National Institute for Colonization and Agrarian Reform, has begun implementation
of a comprehensive new land tenure policy that could resolve structural deficiencies in the existing co-management system
and provide the basis for the ecosystem-based management of the Lower Amazon floodplain.
Readers should send their comments on this paper to: BhaskarNath@aol.com within 3 months of publication of this issue. 相似文献
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Juarez AB Barsanti L Passarelli V Evangelista V Vesentini N Conforti V Gualtieri P 《Journal of environmental monitoring : JEM》2008,10(11):1313-1318
In microorganisms and plants, chromium (Cr) is not essential for any metabolic process, and can ultimately prove highly deleterious. Due to its widespread industrial use, chromium has become a serious pollutant in diverse environmental settings. The presence of Cr leads to the selection of specific algal populations able to tolerate high levels of Cr compounds. The varying Cr-resistance mechanisms displayed by microorganisms include biosorption, diminished accumulation, precipitation, reduction of Cr(6+) to Cr(3+), and chromate efflux. In this paper we describe the effects of Cr(6+) (the most toxic species) on the photosynthetic and photoreceptive apparatus of two fresh water microalgae, Eudorina unicocca and Chlorella kessleri. We measured the effect of this heavy metal by means of in vivo absorption microspectroscopy of both the thylakoid compartments and the eyespot. The decomposition of the overall absorption spectra in pigment constituents indicates that Cr(6+) effects are very different in the two algae. In E. unicocca the metal induced a complete pheophinitization of the chlorophylls and a modification of the carotenoids present in the eyespot after only 120 h of exposition at a concentration equal or greater than 40 microM, which is the limit for total Cr discharge established by US EPA regulations. In C. kessleri, chromium concentrations a hundred times higher than this limit had no effect on the photosynthetic machinery. The different tolerance level of the two algae is suggested to be due to the different properties of the mucilaginous envelope and cell wall covering, respectively, the colonies of Eudorina and the single cells of Chlorella, which binds chromium cations to a different extent. 相似文献
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Mass coral bleaching events have occurred on a global scale throughout the worlds tropical oceans and can result in large-scale coral mortality and degradation of coral reef communities. Coral bleaching has often been attributed to periods of above normal seawater temperatures and/or calm conditions with high levels of ultraviolet radiation. Unusually high shallow-water temperature (>29°C) in Kaneohe Bay, Hawaii, USA, in late summer (20 August–9 September) and fall (1–7 October) of 1996 produced visible bleaching of two dominant corals, Porites compressa Dana, 1864 and Montipora verrucosa Dana, 1864. The present study examined chlorophyll a (chl a), total lipid concentrations, and lipid class composition in corals of both species in which the entire colony was non-bleached, moderately bleached, or bleached. Skeletal, host tissue, and algal symbiont 13C values were also measured in non-bleached and bleached colonies. In additional unevenly bleached colonies, paired samples were collected from bleached upper surfaces and non-bleached sides. Samples were collected on 20 November 1996 during the coral recovery phase, a time when seawater temperatures had been back to normal for over a month. Chl a levels were significantly lower in bleached colonies of both species compared with non-bleached specimens, and in bleached areas of unevenly bleached single colonies. Total lipid concentrations were significantly lower in bleached P. compressa compared with non-bleached colonies, whereas total lipid concentrations were the same in bleached and non-bleached M. verrucosa colonies. The proportion of triacylglycerols and wax esters was lower in bleached colonies of both species. Both bleached and non-bleached M. verrucosa had from ~17% to 35% of their lipids in the form of diacylglycerol, while this class was absent in P. compressa. 13C was not significantly different in the host tissue and algal symbiont fractions in non-bleached and bleached samples of either species. This suggests that the ratio of carbon acquired heterotrophically versus photosynthetically was the same regardless of condition. Skeletal 13C was significantly lower in bleached than in non-bleached corals. This is consistent with previous findings that lower rates of photosynthesis during bleaching results in lower skeletal 13C values. The two species in this study displayed different lipid class compositions and total lipid depletions following bleaching, suggesting that there is a difference in their metabolism of lipid reserves and/or in their temporal responses to bleaching and recovery.Communicated by J.P. Grassle, New Brunswick 相似文献
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Sehnem Simone Pereira Luis Henrique Junior Silvio Santos Bernardy Rógis Juarez Lara Ana Cláudia 《Journal of Material Cycles and Waste Management》2022,24(3):1020-1036
Journal of Material Cycles and Waste Management - Food waste is a serious problem worldwide. There is a lot of waste in the food sector, while we still have a significant percentage of people who... 相似文献
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