نتایج جستجو برای: d24
تعداد نتایج: 363 فیلتر نتایج به سال:
In this study, the optimization of medium components used for production lipase enzyme from Cryptococcus albidus D24 was performed using Plackett-Burman statistical design method (PBD), and most important nutrients affecting strain were determined as first step. According to PBD, highest activity (19.34 U/ml/min) obtained with including Tween 80 (X2) 2.5% (v/v), (g/L) Peptone (X4) 8.0, Yeast Ex...
Granulocyte macrophage colony-stimulating factor (GMCSF) can mediate antitumor effects by recruiting natural killer cells and by induction of tumor-specific cytotoxic T-cells through antigen-presenting cells. Oncolytic tumor cell-killing can produce a potent costimulatory danger signal and release of tumor epitopes for antigen-presenting cell sampling. Therefore, an oncolytic adenovirus coding ...
Innovation plays a crucial role in improving firm's performance. The relationship between innovation and productivity has been widely analysed during this decade across countries industries, generating important new findings. This study aims to provide an overall literature review on the of firms obtain comprehensive overview changing productivity. By reviewing existing empirical evidence, one ...
Durio zibethinus L. (durian) belongs to the Malvaceae family. It is known as “King of Tropical Fruit” because its unique characteristics. The edible part durian, however, only about 33% fruit while non-edible parts such seed and peels (rinds) are considered waste responsible for environmental pollution. Thus, present study was carried out compare percentage yields volatile components from metha...
Factor market failures can limit adoption of profitable technologies. We leverage a plot-level spatial regression discontinuity design in the context irrigation use by farmers provided free access to water. Using boosts profits 43–62 percent. Yet, only irrigate 30 percent plots because labor costs. demonstrate inefficient use, showing irrigating one plot reduce their on other plots. This ineffi...
This paper studies the relationship between three measures of relative earnings and firm performance based on data of 664 listed manufacturing companies in China over the period 2005-2012. It finds that (1) capital earnings relative to labor earnings and the overall average wage level relative to a firm’s average wage level had negative effects on firm performance; (2) the earnings of high-leve...
Three dimensions of the performance of firms in Ghana’s manufacturing sector are investigated in this paper: their technology and the importance of technical and allocative efficiency. We show that the diversity of factor choices in not due to a non-homothetic technology. Observable skills are not quantitatively important as determinants of productivity. Technical inefficiency is not lower in f...
This paper measures the productivity impact of shop-floor employee involvement. On the basis of a representative German establishment data set, the study finds that the introduction of team-work and autonomous work groups, and a reduction of hierarchies in 1996/97 significantly increased average establishment productivity in 1997 – 2000. The estimation strategy controls for unobserved invariant...
This paper investigates the relationship between telecommunications infrastructure competition, investment and productivity. Using econometric modelling and input-output economics, the analysis examines and measures the extent to which telecommunications has contributed to national and sectoral productivity performance. The main findings from this paper suggests that most industries have benefi...
In parametric stochastic frontier models, the composed error is specified as the sum of a two-sided noise component and a one-sided inefficiency component, which is usually assumed to be half-normal, implying that the error distribution is skewed in one direction. In practice, however, estimation residuals may display skewness in the wrong direction. Model respecification or pulling a new sampl...
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