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| Registros recuperados: 13.863 | |
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| RIVAS,MARIELLA; SEEGER,MICHAEL; HOLMES,DAVID S; JEDLICKI,EUGENIA. |
| The genome of the acidophilic, proteobacterium Acidithiobacillus ferrooxidans, contains linked but divergently oriented genes, termed afeI and afeR, whose predicted protein products are significantly similar to the LuxI and LuxR families of proteins. A possible promoter and Lux box are predicted upstream of afeI. A cloned copy of afeI, expressed in E. coli, encodes an enzyme that catalyzes the production of a diffusible compound identified by gas chromatography and mass spectrometry as an unsubstituted N-acyl homoserine lactone (AHL) of chain length C14. This AHL can be detected by a reporter strain of Sinorhizobium meliloti Rm41 suggesting that it is biologically active. The reporter strain also responds to extracts of the supernatant of A. ferrooxidans... |
| Tipo: Journal article |
Palavras-chave: A. ferrooxidans; Quorum-sensing; LuxI and LuxR; Lux box; Homoserine lactone. |
| Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000200018 |
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| Hingyi, Hajnalka. |
| A vizsgálatok feltárták az egyes régiók gabonatermelése közti különbsége-ket, különös tekintettel a vetésterületek, hozamok és az árbevételek alakulására. Megállapítást nyert, hogy: • A legjelentősebb búzatermelő régióink a Dél-Dunántúl és a Dél-Alföld. Mindkét régióban az összes betakarított termésmennyiség és a termésátlag is meghaladta a többi régió eredményeit a vizsgált időszakban. • A kukorica esetében is a Dél-Dunántúli Régió a meghatározó, 2004-ben 11%-kal többet takarítottak be az Észak-Alföld termelésénél és közel hétszer többet a legalacsonyabb terméseredményű Közép-Magyaroszágénál. A termésát-lagok szintén a dél-dunántúli régióban voltak a legmagasabbak a vizsgált idő-szakban. • A régiók termésátlagai – az egyes régiók eltérő... |
| Tipo: Journal Article |
Palavras-chave: Régió; Búza; Kukorica; Rekordtermés; Árbevétel - regions; Wheat; Maize; Record harvest; Income; Agribusiness; Crop Production/Industries; Demand and Price Analysis. |
| Ano: 2005 |
URL: http://purl.umn.edu/54334 |
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| Pires Bione,Nilton Cesar; Suely Pagliarini,Maria; Alves de Almeida,Leones. |
| A spontaneous male-sterile, female-fertile mutation affecting bivalent arrangement at the metaphase plate and cytokinesis was detected in line BR98-197 of the soybean breeding program developed by Embrapa - National Soybean Research Centre. Untill diakinesis, meiosis was normal with chromosome pairing as bivalents. From this phase, in several meiocytes, bivalents were not able to organize a single metaphase plate and remained scattered in the cytoplasm in a few or several groups. In these meiocytes, chromosomes segregated in both divisions giving rise to several micronuclei. However, the main cause of male sterility was the absence of cytokinesis after telophase II. Instead of the typical tetrads of microspores, four nucleate coenocytic microspores were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Meiosis; Metaphase plate; Cytokinesis; Male sterility. |
| Ano: 2005 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452005000200004 |
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| Kypreos, Socrates. |
| Two stylized backstop systems with endogenous technological learning formulations (ETL) are introduced in MERGE: one for the electric and the other for the non-electric markets. Then the model is applied to analyze the impacts of ETL on carbon-mitigation policy, contrasting the resulting impacts with the situation without learning. As the model considers endogenous technological change in the energy sector only some exogenous key parameters defining the production function are varied together with the assumed learning rates to check the robustness of our results. Based on model estimations and the sensitivity analyses we conclude that increased commitments for the development of new technologies to advance along their learning curves has a potential for... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2005 |
URL: http://purl.umn.edu/12083 |
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| Lusk, Jayson L.; Jamal, Mustafa; Kurlander, Lauren; Roucan, Maud; Taulman, Lesley. |
| A plethora of research in recent years has been devoted to estimating consumer demand for genetically modified food, an important piece of information needed to create appropriate public policy. To examine this body of work, a meta-analysis was conducted of 25 studies that, in aggregate, report 57 valuations for GM food. Findings indicate as much as 89% of the variation in existing value estimates for genetically modified food can be explained by an econometric model that controls for (a) the characteristics of the sample of consumers studied, (b) the method for eliciting consumers' valuation, and (c) characteristics of the food being valued. Each of these factors has a statistically significant effect on estimated premiums for non-GM food. Results of... |
| Tipo: Journal Article |
Palavras-chave: Biotechnology; Consumer acceptance; Genetically modified food; Willingness to pay; Consumer/Household Economics. |
| Ano: 2005 |
URL: http://purl.umn.edu/30782 |
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| Florax, Raymond J.G.M.; Travisi, Chiara M.; Nijkamp, Peter. |
| The use of environmental policy instruments such as eco-labelling and pesticide taxes should preferably be based on disaggregate estimates of the individuals' willingness to pay (WTP) for pesticide risk reductions. We review the empirical valuation literature dealing with pesticide risk exposure and develop a taxonomy of environmental and human health risks associated with pesticide usage. Subsequently, we use meta-analysis to investigate the variation in WTP estimates for reduced pesticide risk exposure. Our findings show that the WTP for reduced risk exposure is approximately 15% greater for medium, and 80% greater for high risk-levels, as compared to low risk levels. The income elasticity of pesticide risk exposure is generally positive, although not... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Institutional and Behavioral Economics. |
| Ano: 2005 |
URL: http://purl.umn.edu/19524 |
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| Szilagyi, Robert; Herdon, Miklos. |
| A mobil kommunikáció, ezen belül a mobil Internet az agrárgazdaság számá-ra a használat hely és idő függetlensége miatt fontos lehetőséget, gazdasági elő-nyöket, a vállalkozások, szervezetek számára hatékonyabb működést jelenthet. Széleskörű elterjedése, innovációs hatása és előnyei gazdaságosan csak a technológia és a szolgáltatások hatásrendszerének figyelembevételével érhető el. A technológiai, társadalmi és gazdasági komplex hatásrendszer befolyásolja a gazdasági alkalmazások terjedését. Az alkalmazható eszközök köre folyamatosan bővül, fejlődik. Már ma is sok készüléktípus áll rendelkezésünkre: mobiltelefon, smartphone, PDA, laptop, TabletPC. A kommunikációs technológiák és szabványok köréből kiemelhető a 3G és a WiFi szabvány. Társadalmi szempontból... |
| Tipo: Journal Article |
Palavras-chave: Mobil internet; Mobil kommunikáció; Agrárgazdaság; Mobile internet; Mobile communication; Agricultural economy; Marketing; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2005 |
URL: http://purl.umn.edu/54421 |
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| Pedersen, Anders; Stoumann Jensen, Lars; Thorup-Kristensen, Kristian. |
| The use of crops and catch crops with deep rooting can strongly improve the possibility of retaining nitrate-N that will otherwise be leached to the deeper soil layers and end up in the surrounding environment. But will it always be an advantage for the farmer to grow a catch crop? This will depend on factors such as soil mineral nitrogen level, soil water holding capacity, winter precipitation, rooting depth and N demand of the scceeding crop. These factors interact, and it can be very difficult for farmers or advisors to use this information to decide whether growing a catch crop will be beneficial. To analyse the effect of catch crops under different Danish soil and precipitation conditions, we used the soil, plant and atmosphere model Daisy. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Post harvest management and techniques; Crop combinations and interactions; Farm nutrient management; Soil quality. |
| Ano: 2005 |
URL: http://orgprints.org/7831/1/7831.pdf |
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| Salm,Rodolfo; Jalles-Filho,Euphly; Schuck-Paim,Cynthia. |
| In this study we propose a model that represents the importance of large arborescent palms in the dynamics of seasonally-dry Amazonian forests. Specifically, the model is aimed at guiding the investigation of the role of large arborescent palms on forest regeneration and succession. Following disturbance, the high level of luminosity reaching recently formed forest gaps favors the quick proliferation of shade-intolerant lianas that, by casting shade on the crowns of mature forest trees and increasing tree-fall probability, suppress forest succession. Due to their columnar architecture palm trees are, however, not severely affected by vines. As the palms grow, the canopy at the gaps becomes gradually higher and denser, progressively obstructing the passage... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon; Attalea maripa; Forest dynamics; Palm trees; Regeneration. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032005000300011 |
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| Registros recuperados: 13.863 | |
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