Consulta: subjectFacets:"Resource allocation"
Registros recuperados: 15
Data/hora: 02/06/2024 07:43:43

Negative genetic correlations between production traits and head or bony tissues in large all-female rainbow trout (Oncorhynchus mykiss)
Provedor de dados: 5
Autores: Haffray, Pierrick; Bugeon, Jerome; Pincent, Cedric; Chapuis, Herve; Mazeiraud, Emmanuel; Rossignol, Marie-noelle; Chatain, Beatrice; Vandeputte, Marc; Dupont-nivet, Mathilde.
Genetic parameters of production traits (growth, carcass yield, fillet yield) and bony tissues (head and vertebral axis) were estimated for large all-female rainbow trout Oncorhynchus mykiss reared in freshwater. Genetic parameters were estimated using REML at 16 months of age (1636 g) on 1962 DNA-assigned progenies from a partial factorial mating design with 60 dams and 100 sex-reversed sires. Most traits presented medium to high heritability (0.37 to 0.54). A high genetic correlation (r(A)=0.97) was found between fillet yield and headless gutted carcass yield (or HGCarc%). Due to its higher heritability and high genetic correlation with fillet yield, selection on HGCarc% should result in a 50% increase in selection efficiency on fillet yield by reducing...
Tipo: Text
Palavras-chave: Resource allocation; Fillet yield; Head; Salmonids; Aquaculture; Selective breeding.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00109/22042/19801.pdf

Optimal feedback strategies for bacterial growth with degradation, recycling, and effect of temperature
Provedor de dados: 5
Autores: Yegorov, Ivan; Mairet, Francis; Gouze, Jean-luc.
Mechanisms of bacterial adaptation to environmental changes are of great interest for both fundamental biology and engineering applications. In this work, we consider a continuous-time dynamic problem of resource allocation between metabolic and gene expression machineries for a self-replicating prokaryotic cell population. In compliance with evolutionary principles, the criterion is to maximize the accumulated structural biomass. In the model, we include both the degradation of proteins into amino acids and the recycling of the latter (ie, using as precursors again). On the basis of the analytical investigation of our problem by Pontryagin's maximum principle, we develop a numerical method to approximate the switching curve of the optimal feedback control...
Tipo: Text
Palavras-chave: Bacterial growth; Chattering regime; Effect of temperature; Feedback strategy; Optimal control; Pontryagin's maximum principle; Protein degradation; Recycling; Resource allocation; Singular regime; Switching curve.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00434/54592/56057.pdf

Allometry and ontogeny in Callibia diana Stål (Mantodea: Acanthopidae)
Provedor de dados: 82
Autores: Avendaño,J; Sarmiento,CE.
The life-cycle of Callibia diana Stål is described and linear and geometric morphometrics are used for studying allometrics and shape changes throughout this neotropical mantid species' life-cycle. Significant changes were expected in the allometry and shape of the raptorial leg and abdomen, given the importance of hunting and reproduction. The allometric slopes were obtained by using total length as the independent variable. Geometric morphometrics of landmarks were used for frontal femur and tibia. Hunting and reproduction-related structures had the steepest slopes and positive allometries. Negative growth of both disc width and head width found in the last moulting event may be a consequence of prothoracic muscle growth which is responsible for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Raptorial leg; Resource allocation; Geometric morphometrics; Hunting strategy; Functional morphology.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000400009

Technical Efficiency in Louisiana Sugar Cane Processing
Provedor de dados: 31
Autores: Johnson,   Jason L.; Zapata,   Hector O.; Heagler,   Arthur M.
Participants in the Louisiana sugar cane industry have provided little information related to the efficiency of sugar processing operations. Using panel data from the population of Louisiana sugar processors, alternative model specifications are estimated using stochastic frontier methods to measure the technical efficiency of individual sugar factories. Results suggest the Louisiana sugar processing industry is characterized by a constant returns to scale Cobb-Douglas processing function with high technical efficiency.
Tipo: Journal Article
Palavras-chave: Technical efficiency; Stochastic frontier; Resource allocation; Sugar cane processing; Agribusiness; Productivity Analysis.
Ano: 1995
URL: http://purl.umn.edu/90369

Policies for Promoting Public Goods in Agriculture
Provedor de dados: 31
Autores: Romstad,   Eirik.
The ongoing negotiations of the World Trade Organization (WTO) on agriculture has triggered an increased interest in the linkages between commodity production and public goods in agriculture.  This paper takes a closer look at this issue.  Particular emphasis is placed on production economics and policy design issues. Production is placed in a multi-product multi-input setting.  The provision of public goods from agriculture is analyzed utilizing a principle-agent framework.  Particular emphasis is placed on issues pertaining to incentive compatibility, informational aspects and the participation constraint.  Public finance aspects of various policies are also addressed.  Price supports are of particular interest as they are widely used in European...
Tipo: Conference Paper or Presentation
Palavras-chave: Multi-product production; Public goods; Agriculture; Principal-agent models; Resource allocation; Policy; Agricultural and Food Policy.
Ano: 2002
URL: http://purl.umn.edu/24930

FARM OUTPUT, NON-FARM INCOME, AND COMMERCIALIZATION IN RURAL GEORGIA
Provedor de dados: 31
Autores: Kan,   Iddo; Kimhi,   Ayal; Lerman,   Zvi.
This article examines the decision of farmers to sell part of their farm output on the market, using data from the Republic of Georgia. A two-level empirical model is used, in which endowments and resource allocation decisions determine farm output and non-farm income, and these in turn determine market participation. We found, as expected, that farm output affects market participation positively, while non-farm income affects it negatively. Landholdings have an indirect positive effect on market participation, through its positive effect on farm output. Education has a negative effect on market participation, mainly through its positive effect on non-farm income.
Tipo: Working or Discussion Paper
Palavras-chave: Commercialization; Market participation; Farm output; Non-farm income; Resource allocation; Farm Management; O12; P23; P25.
Ano: 2006
URL: http://purl.umn.edu/7179

Farm Output, Non-Farm Income, and Commercialization in Rural Georgia
Provedor de dados: 31
Autores: Kan,   Iddo; Kimhi,   Ayal; Lerman,   Zvi.
This article examines the decision of farmers to sell part of their farm output on the market, using data from the Republic of Georgia. A two-level empirical model is used, in which endowments and resource allocation decisions determine farm output and non-farm income, and these in turn determine market participation. We found, as expected, that farm output affects market participation positively, while non-farm income affects it negatively. Landholdings have an indirect positive effect on market participation, through its positive effect on farm output. Education has a negative effect on market participation, mainly through its positive effect on non-farm income.
Tipo: Journal Article
Palavras-chave: Commercialization; Market participation; Farm output; Non-farm income; Resource allocation; Agricultural Finance; Farm Management.
Ano: 2006
URL: http://purl.umn.edu/112608

Equity judgments and context dependence: Knowledge, efficiency and incentives
Provedor de dados: 31
Autores: Schilizzi,   Steven.
Distributional equity concerns are often at least as important as economic efficiency and ecological sustainability in environmental and natural resource management policies. Until recently, however, economists have shied away from tackling equity issues, primarily because equity appeared as a slippery concept, varying across people and circumstances. This study takes this context-dependence of equity judgments as a starting point and shows that such dependence, far from being random, is systematic. A series of controlled laboratory treatments with University students were designed to investigate the role on distributional equity judgments of such context factors as knowledge of one’s position in society, how the existence of equity-efficiency tradeoffs...
Tipo: Working or Discussion Paper
Palavras-chave: Equity; Fairness; Resource allocation; Environmental policy; Experimental economics; Welfare economics; Public choice; Institutional and Behavioral Economics; Public Economics; C92; D03; D63; H23; Q56; Q58.
Ano: 2011
URL: http://purl.umn.edu/100887

Resource Allocation of Agricultural Science and Technology R&amp;D
Provedor de dados: 31
Autores: Li,   Xian-song; Bai,   Li; Zhang,   Li-ming.
The status quo of resource allocation of agricultural science and technology R&amp;D (research and development)both at home and abroad，including the amount and function of agricultural science and technology research funds, human resources in the resources of agricultural science and technology R&amp;D , the efficiency of resource allocation of agricultural science and technology R&amp;D, the management system of agricultural scientific innovation and the operation status of scientific funds, is analyzed.   The problems in the current resource allocation of agricultural science and technology R&amp;D are put forward. For instance, unreasonable resource allocation;, low efficiency, and low efficiency of the transformation of agricultural scientific results....
Tipo: Journal Article
Palavras-chave: Resource of agricultural science and technology R&amp;D; Resource allocation; Efficiency; Mode; China; Agribusiness.
Ano: 2011
URL: http://purl.umn.edu/113423

Effects of sex and altitude on nutrient, and carbon and nitrogen stable isotope composition of the endangered shrub Baccharis concinna G.M. Barroso (Asteraceae)
Provedor de dados: 39
Autores: Fernandes,G. Wilson; Duarte,Heitor Monteiro; Silveira,Fernando A. O.; Broetto,Fernando; Lüttge,Ulrich; Rennenberg,Heinz.
ABSTRACT Previous ecological studies of dioecious plant species have found that female plants preferentially occur at lower altitudes where there are typically better nutritional conditions, while male plants often occur in less favorable sites. We compared the ecophysiological performance of male and female plants in three populations of the dioecious Baccharis concinna, an endemic species of rupestrian grasslands of Serra do Cipó, in southeastern Brazil. We hypothesized that physiological differences between the sexes would explain the distribution patterns of the populations. Analyses of the tissue content of phosphorus (P), calcium (Ca), potassium (K) and sodium (Na), and carbon and nitrogen stable isotopes, were used to assess nutritional status and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Campos rupestres; Dioecy; Plant sex; Resource allocation; Rupestrian grasslands; Serra do Cipó.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200229

Ecological factors affecting the fruiting success of a Tibouchina trichopoda (DC.) Baill. (Melastomataceae) flower
Provedor de dados: 39
Autores: Maia,Fabiano Rodrigo da; Malucelli,Tiago Simões; Varassin,Isabela Galarda.
The abundance and distribution of resources for pollinators modulate the reproduction of plants. This study attempted to determine whether and how the fruiting success of Tibouchina trichopoda flowers varies due to plant size, number of flowers produced, distance between individuals and cardinal orientation of the flowers. From July 2009 to February 2010, we conducted monthly evaluations of 21 plants in an area of regenerating forest within the Atlantic Forest biome, located near the municipality of Antonina, in southern Brazil. Floral density was monitored weekly. During the study period, the species bloomed twice: once during the cool, dry season, showing an extended flowering period with scattered flowering individuals; and once during the hot, rainy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resource allocation; Atlantic Rainforest; Plant-pollinator interactions; Population density; Floral longevity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100014

Does inter-plant variation in sprouting time affect the growth/reproduction trade-off and herbivory in a tropical tree species?
Provedor de dados: 39
Autores: Fagundes,Marcilio; Xavier,Renata C.; Ramos,Letícia F.L.; Siqueira,Walisson K.; Reis-Junior,Ronaldo; Souza,Matheus L.
ABSTRACT The timing of phenological events varies within and among populations, affecting the performance of individual plants differently. We evaluated the effects of relative variation in sprouting time on the display of reproductive events, vegetative growth and herbivory in Copaifera langsdorffii (Fabaceae). A total of 93 trees of C. langsdorffii was monitored daily to determine their sprouting time. We collected ten terminal branches of each plant to evaluate vegetative growth, production of defense compounds and insect herbivore damage. The sprouting time for the studied population lasted 67 days. Variation in sprouting time did not affect the probability of plants to enter the reproductive stage. Plants that entered the reproductive stage showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copaifera langsdorffii; Flowering trigger; Herbivory escape; Phenological asynchrony; Resource allocation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000400602

Carbon dioxide-enriched atmosphere enhances biomass accumulation and meristem production in the pioneer shrub Baccharis dracunculifolia (Asteraceae)
Provedor de dados: 39
Autores: Mendes de Sá,Camila Emiliane; Negreiros,Daniel; Fernandes,Geraldo Wilson; Dias,Mariana Costa; Franco,Augusto César.
The increase in atmospheric CO2 concentration predicted to the end of this century may cause several alterations on plant species development, which shall result in changes in the structure and function of plant communities. The present work aimed to investigate the effects of the increase in atmospheric CO2 concentration on the development of Baccharis dracunculifolia, a key pioneer Neotropical shrub. Seedlings of B. dracunculifolia were exposed to 720 ppm of CO2 as well as to ambient concentration of CO2 (approximately 360 ppm) during 120 days in open top chambers. Growth and dry biomass accumulation were higher under elevated CO2 concentrations. As a response to CO2 enrichment, there was an increase of 134% in total dry mass, 208% in root dry mass and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Elevated [CO2]; Plant growth; Pioneer species; Resource allocation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400021

Architecture of tree species of different strata developing in environments with the same light intensity in a semideciduous forest in southern Brazil
Provedor de dados: 39
Autores: Batista,Natália de Almeida; Bianchini,Edmilson; Carvalho,Eloisa de Souza; Pimenta,José Antonio.
We aimed to answer the following questions related to the architecture of individuals 0.5-3.0 m in height belonging to understory or canopy/emergent layer tree species: "Is there a difference between individuals belonging to different strata developing in environments with the same light intensity, in terms of their architecture?"; and "Given the same light intensity, do understory species exhibit less crown plasticity than do canopy/emergent layer species?" Thirteen architectural variables were evaluated in 80 individuals per species. We found that understory species showed greater increases in stem thickness and leaf number, as well as wider, deeper crowns, longer branches, greater self-shading and less crown plasticity. Stems and crowns were more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resource allocation; Canopy; Allometric relationships; Understory.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000100004

Resprouting ability and intensity after damage in seedlings of the large-seeded species Araucaria angustifolia
Provedor de dados: 61
Autores: Alabarce,Fernanda da Silva; Dillenburg,Lucia Rebello.
The role of seed reserves on the ability to resprout and on the responses of resprouting in Araucaria angustifoliawas investigated. Seedlings were separated into three groups: plants which had their shoot damaged, a similar group in which damaged plants had their connection to the supporting seed removed, and a control group. All damaged seedlings resprouted, but those which remained connected to their seeds had a greater mass of resprouted shoots than the ones disconnected from their seeds. A greater accumulation of seed mass in the underground hypocotyl was a very distinct initial response to damage, but, on the long run, damaged plants were able to reestablish a biomass allocation pattern, which was very similar to the control plants. These results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian pine; Herbivory; Resource allocation; Seed size; Storage.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000200006