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| Registros recuperados: 6.820 | |
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| Carvalho,K.M.; Nava,R.A.; França,M.S.F.; Medeiros,M.A.S.; Camarão,G.C.; Juliano,L.. |
| A new metalloendopeptidase was purified to apparent homogeneity from a homogenate of normal human liver using successive steps of chromatography on DEAE-cellulose, hydroxyapatite and Sephacryl S-200. The purified enzyme hydrolyzed the Pro7-Phe8 bond of bradykinin and the Ser25-Tyr26 bond of atrial natriuretic peptide. No cleavage was produced in other peptide hormones such as vasopressin, oxytocin or Met- and Leu-enkephalin. This enzyme activity was inhibited by 1 mM divalent cation chelators such as EDTA, EGTA and o-phenanthroline and was insensitive to 1 µM phosphoramidon and captopril, specific inhibitors of neutral endopeptidase (EC 3.4.24.11) and angiotensin-converting enzyme (EC 3.4.15.1), respectively. With Mr 85 kDa, the enzyme exhibits optimal... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Liver metalloendopeptidase; Bradykinin; Atrial natriuretic peptide. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000100007 |
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| Lindahl, U.. |
| Many coral reefs that have been subjected to severe coral mortality may erode into rubble before the reef framework has been stabilised by the growth of recruiting or surviving corals and other calcifying organisms. Since unconsolidated coral rubble provides a poor substrate for coral recruitment and subsequent growth, these damages can persist for a long time, even where there is ample supply of coral larvae. Rehabilitation of this type of habitat through coral transplantation has therefore been hampered since the substrate does not provide a base for attachment. Unattached corals that are moved by water movements may suffer severe damages through breakage and abrasion, and are also at risk of being buried in the shifting sediment. The aim of the present... |
| Tipo: Working Paper |
Palavras-chave: Coral reefs. |
| Ano: 1999 |
URL: http://hdl.handle.net/1834/431 |
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| Agrell, Per J.. |
| The development of a third world country requires a conscious balance between different planning and policy issues, such as population growth rate, gross national income, self reliance and long-term sustainable ecological development. This paper reports on a cross-disciplinary project to design a decision support system (DSS) that aims to assist government policy makers in planning the regional agricultural development of the Bungoma region in Kenya. Contrary to previous research, which has taken the perspective of a central planner and a static market, this model extends the scope by introducing the market mechanisms and price subsidies. The model is based on the Agro-Ecological Zones (AEZ) model, a previously developed non-interactive optimization... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Decision analysis; Multicriteria decision making; Integrated land-use planning and management; Decision support systems; Land Economics/Use. |
| Ano: 1999 |
URL: http://purl.umn.edu/24178 |
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| Mantovani,André. |
| Leaf succulence has important physiological and ecological implications. Currently it is quantified by Delf's index (fresh weight/leaf area) and fresh weight/ dry weight ratio. Both indeces are reconsidered and a new index is proposed. Shade and sun leaves from terrestrial, hemiepiphytic and epiphytic aroids were studied. Delf's formula, which does not consider dry weight, overestimated leaf succulence. As fresh weight / dry weight ratio (fw / dw) does not consider leaf area, plants with the same fw / dw ratio were more than five times different in area. The last case was only possible with a decrease in surface / volume ratio and a increase of mesophyll thickness, components not measured by fw / dw ratio. The new index proposed here, which takes into... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leaf succulence; Water relations; Leaf anatomy; Araceae; Ecophysiology. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000100002 |
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| Nienow, Sara; McNamara, Kevin T.; Gillespie, Andrew R.; Preckel, Paul V.. |
| Public and private electric utilities are considering co-firing biomass with coal as a strategy to reduce the levels of CO2, SO2 and NO, in stack emissions, as well as a response to state legislative mandates requiring the use of renewable fuels. This analysis examines the conditions under which biomass co-firing is economically feasible for utilities and woody biomass producers and describes additional environmental and community benefits associated with biomass use. This paper presents a case study of woody biomass production and co-firing at the Northern Indiana Public Service Company (NIPSCO) Michigan City Unit No.12 power plant. A Salix (willow) production budget was created to assess the feasibility of plantation tree production to supply biomass to... |
| Tipo: Journal Article |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 1999 |
URL: http://purl.umn.edu/31498 |
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| Islam, Zahirul; Turvey, Calum G.; Hoy, Michael. |
| The main motivation for this paper is the recognition of the fact that asymmetric information is the form of moral hazard and adverse selection results in sizeable efficiency losses. These costs are passed back to producers in the form of excessively high premium rates and also passed back to the government via the crop insurance subsidy program. A secondary motivation stems from a recent debate in the literature regarding the specific effects of moral hazard on agricultural input use. Conventional wisdom suggests that moral hazard will induce producers to reduce input usage. A competing hypothesis has emerged which suggests that moral hazard may induce producers to increase their usage or risk increasing inputs. The main objective of this paper was to... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Risk and Uncertainty. |
| Ano: 1999 |
URL: http://purl.umn.edu/34103 |
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| Medina, Sara; Ward, Ronald W.. |
| Multinomial logit models were used to explain consumer outlet selection when buying beef, specifically roasts, steaks, ground beef, and other types of beef. Outlets were grouped into supermarkets, butchers, warehouses, supercenters, and others, and the probability of selecting each outlet type over a range of demographic and other variables was tested. The models were estimated from household data, with 198,682 observations used in the estimation. Empirical results showed that the type of beef purchased and the size of the purchase played an importance role in the choice of outlet. Furthermore, the increase in mobility seen when consumers buy larger unit cuts could not be fully explained by price discounting. Implications for the potential growth of... |
| Tipo: Journal Article |
Palavras-chave: Consumer/Household Economics; Food Consumption/Nutrition/Food Safety. |
| Ano: 1999 |
URL: http://purl.umn.edu/34205 |
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| Ashfaq, Muhammad; Parton, Kevin A.; Griffith, Garry R.; Piggott, Roley R.. |
| Government price policy in Pakistan affects both the supply and demand of wheat. The wheat market has been established in a particular idiosyncratic manner in Pakistan, and a thorough appraisal of policy needs to take this into account. Hence, to analyse various policy interventions, this study develops a multi-level wheat market model. After considering the real world aspects of the wheat marketing chain, a conceptual framework is developed involving five market levels. This is then translated into a multi-equation econometric model. The model is based on secondary time series data from 1971 to 1996. It consists of equations representing supply, demand, stock holding, importing and price formation. The model is used to estimate changes in consumer... |
| Tipo: Presentation |
Palavras-chave: Crop Production/Industries; Marketing. |
| Ano: 1999 |
URL: http://purl.umn.edu/123757 |
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| Vincent, Benoit. |
| IFREMER and ECN have been working together for almost ten years on problems related to the numerical simulation of trawls and more generally the numerical simulation of any kind of fishing gear. To develop such a simulation tool, we need to build (i) a software in which all the parameters of the fishing gear are taken into account; (ii) a software that computes the physical behaviour of the fishing gear (static or dynamic); (iii) a software to visualise the results of calculations. The most complex part of this work most of the time rests in the point (i), because of the huge amount of parameters and elements of an actual fishing net. We have already developed a tool (point (i), named Cachalot) to describe a trawl. However, this software was designed to... |
| Tipo: Text |
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| Ano: 1999 |
URL: https://archimer.ifremer.fr/doc/00639/75159/75298.pdf |
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| Cook, Darron M.. |
| This paper considers an alternative approach dichotomous choice contingent valuation (DC), referred to as the dissonance minimising format (DM). This method seeks to reduce the extent of positive bias at the formulation stage of stated preference experiments known as “yea-saying”, in order to gain a more accurate measure of respondent WTP. Both the DC and DM methodologies are applied to the case study of minesite rehabilitation within Victoria, with particular reference to the abandonment of open pits following small-scale gold mining operations. The results presented here indicate that the DM model has considerable promise for reducing yea-saying within dichotomous choice CV. The results also indicate that the community welfare loss associated with... |
| Tipo: Presentation |
Palavras-chave: Environmental Economics and Policy. |
| Ano: 1999 |
URL: http://purl.umn.edu/123795 |
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| Registros recuperados: 6.820 | |
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