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- Heshmati, Almas, et al.
(författare)
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Technical efficiency of the Ugandan matoke farms
- 1996
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Ingår i: Applied Economics Letters. - 1350-4851 .- 1466-4291. ; 3:7, s. 491-494
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Tidskriftsartikel (refereegranskat)abstract
- The issues of measurement of technical efficiency in the production of matoke in Uganda are investigated. A Cobb-Douglas functional form is used to represent the underlying production technology and corrected least squares procedure to estimate the model and the farm-specific measures of technical efficiency. The data consists of a crossection of 288 matoke-producing family farms during the crop year 1990-1991. The productive performance of farms are compared according to the size of land. The impact of various production characteristics on the production structure of the farms is also tested. The empirical results from a comparison of different farm sizes show very small variations in mean efficiency between the different size classes. Some variations in the distribution of farms within each size-class are observed. The mean technical efficiency is found to be 65%.
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| 3. |
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| 4. |
- Heshmati, Y, et al.
(författare)
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The histone chaperone NAP1L3 is required for haematopoietic stem cell maintenance and differentiation
- 2018
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Ingår i: Scientific reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 8:1, s. 11202-
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Tidskriftsartikel (refereegranskat)abstract
- Nucleosome assembly proteins (NAPs) are histone chaperones with an important role in chromatin structure and epigenetic regulation of gene expression. We find that high gene expression levels of mouse Nap1l3 are restricted to haematopoietic stem cells (HSCs) in mice. Importantly, with shRNA or CRISPR-Cas9 mediated loss of function of mouse Nap1l3 and with overexpression of the gene, the number of colony-forming cells and myeloid progenitor cells in vitro are reduced. This manifests as a striking decrease in the number of HSCs, which reduces their reconstituting activities in vivo. Downregulation of human NAP1L3 in umbilical cord blood (UCB) HSCs impairs the maintenance and proliferation of HSCs both in vitro and in vivo. NAP1L3 downregulation in UCB HSCs causes an arrest in the G0 phase of cell cycle progression and induces gene expression signatures that significantly correlate with downregulation of gene sets involved in cell cycle regulation, including E2F and MYC target genes. Moreover, we demonstrate that HOXA3 and HOXA5 genes are markedly upregulated when NAP1L3 is suppressed in UCB HSCs. Taken together, our findings establish an important role for NAP1L3 in HSC homeostasis and haematopoietic differentiation.
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| 5. |
- Kim, T. -Y, et al.
(författare)
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Decelerating agricultural society : Theoretical and historical perspectives
- 2010
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Ingår i: Technological forecasting & social change. - : Elsevier BV. - 0040-1625 .- 1873-5509. ; 77:3, s. 479-499
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Tidskriftsartikel (refereegranskat)abstract
- In general, societies are divided into agricultural and industrial types. This study presents theoretical and historical perspectives on decelerating agricultural societies. Agricultural demand and supply play major roles in society development. Three descriptions of an agricultural society and theories of its deceleration patterns are presented: the neo-classical production function, stage theory, and induced innovation. Two important cases of decelerating agricultural societies and their ultimate replacement by industrial societies, medieval Europe and nineteenth- and twentieth-century United States, are examined. The limitations of decelerating agricultural societies with a focus on structural problems, impacts of industrial structure, and problems of agriculture in market and non-market areas, are also discussed. The position of agriculture as described by economic development theory is established by analyzing the stages of economic development, the theory of structural change, and the theory of leading industry. Finally, the transition from an agricultural to a commercial society is described with a focus on the formation, development, value creation, and structural limitations of a commercial society. ©2009 Elsevier Inc. All rights reserved.
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| 6. |
- Kim, Y., et al.
(författare)
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Analysis of Korean IT startups’ initial public offering and their post-IPO performance
- 2010
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Ingår i: Journal of Productivity Analysis. - : Springer Science and Business Media LLC. - 0895-562X .- 1573-0441. ; 34:2, s. 133-149
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Tidskriftsartikel (refereegranskat)abstract
- Since the financial crisis in Korea, by focusing on core technology, IT startups have played an important role in the recovery of Korea’s economy through innovating technologies and creating new jobs. Even though there are many startups, it is not very common to reach the point of the initial public offering (IPO) and the post-IPO performance of the firms is mostly declining. Since it is rather difficult to apply conventional performance measures to very young firms, IPO has been used as a tool for performance evaluation. This study adopts the IPO as an early-stage measure for the performance of high technology startups. It is important to find out whether an earlier IPO of firms leads to a better performance and capability of firms. We investigate the relationship between the time to IPO of firms and their post-IPO performance for 3 years after their IPO by adopting samples of 79 information technology hardware firms founded after 1996 and listed between 2000 and 2004 in the KOSDAQ. Four determinant factors, including entrepreneurs’ experience, venture capital investment, startups’ technology sourcing, and technology portfolios which determine the firm’s time lag to getting to the IPO, are identified. The findings contain several results. First, the patent has positive effects on the firms’ performance after an IPO and on the firms’ growth before the IPO. Second, a faster technology acquisition via technology alliance has a positive influence on the firms’ IPO regardless of internal technologies. Third, concentrating on core technology, instead of diversifying can mature the startup firms faster. These indicate that a startup’s efficient initial strategy is critical for its performance and it enhances the credit and confidence of the market. ©2010 Springer Science+Business Media, LLC.
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| 10. |
- Su, B., et al.
(författare)
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A review of the circular economy in China : Moving from rhetoric to implementation
- 2013
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Ingår i: Journal of Cleaner Production. - : Elsevier BV. - 0959-6526 .- 1879-1786. ; 42, s. 215-227
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Tidskriftsartikel (refereegranskat)abstract
- Circular economy (CE) is a sustainable development strategy proposed by the central government of China, aiming to improve the efficiency of materials and energy use. This strategy, formally accepted in 2002, has been implemented and developed in a number of pilot areas in China. Scholars have produced rich studies in regard with the CE from its fundamental concept to its practical implementation. Successful enforcement of a CE can be seen as a way for China to tackle its urgent problem of environmental degradation and source scarcity. Given its importance, we provide a holistic literature review on the CE, aiming to provide a panorama of how this strategy has been developed and implemented. The review covers the concept, current practices, and assessment of the CE. To have a more numeric concept of how it has developed, we look at the performance of the CE in Dalian after its implementation of relevant policies and compare the changes with three other pilot cities, Beijing, Shanghai and Tianjin. Based on an examination of the statistical results, we identified the underlying problems and challenges for this national strategy. Finally, we offer a conclusion regarding CE’s development as well as policy recommendations for future improvement. © 2012 Elsevier Ltd. All rights reserved.
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