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Thymol production in hairy root culture of Sahendian savory (Satureja sahendica Bornm)
Bahmani Helia,Maroufi Asad,Majdi Mohammad,Fakheri Barat Ali 한국식물생명공학회 2021 Plant biotechnology reports Vol.15 No.2
Sahendian savory (Satureja sahendica Bornm) is a medicinal plant species which produces valuable secondary metabolites including thymol, p-cymene and γ-terpinene. In this study, optimization of hairy roots culture in S. sahendica using Agrobac�terium rhizogenes was efciently established. High frequency of genetic transformation was obtained using node and inter�node explants and three bacterial strains (ATCC 15834, A4, and LBA 9402). However, leaf explants showed no susceptibility to induce hairy roots with the A. rhizogenes strains. The node explants and LBA 9402 strain were the best combination for root induction. Infection time of 20 min caused greater transformation occurrence compared to 10 and 30 min, respectively. Node explants infected with LBA 9402 were found to produce more transformants upon co-cultivation for 2 days. The maxi�mum induction of hairy roots was obtained from bacterial infection at a density of OD600=0.8. Polymerase chain reaction by gene-specifc primers from rol B gene confrmed the positive transformation events. S. sahendica efciently provided and produced a large number of hairy roots which could be used for the production of secondary metabolites or other molecular and biotechnological applications. Production of thymol an important secondary metabolite of S. sahendica from hairy root cultures was confrmed by TLC and GC analysis. Elicitor-treated hairy root cultures with methyl jasmonate and ammonium nitrate produced more amount of thymol compared to untreated roots. These results demonstrate that secondary metabolite production such as thymol in hairy root culture of Sahendian savory could be used to increase low secondary metabolite production in this valuable medicinal plant.
Bahmani, R.,Kim, D.,Lee, B. D.,Hwang, S. Springer Science + Business Media 2017 Plant Molecular Biology Vol.94 No.4
<P>Ubiquitin (Ub)-conjugating enzyme (UBC, E2) receives Ub from Ub-activating enzyme (E1) and transfers it to target proteins, thereby playing a key role in Ub/26S proteasome-dependent proteolysis. UBC has been reported to be involved in tolerating abiotic stress in plants, including drought, salt, osmotic and water stresses. To isolate the genes involved in Cd tolerance, we transformed WT (wild-type) yeast Y800 with a tobacco cDNA expression library and isolated a tobacco cDNA, NtUBC1 (Ub-conjugating enzyme), that enhances cadmium tolerance. When NtUBC1 was over-expressed in tobacco, cadmium tolerance was enhanced, but the Cd level was decreased. Interestingly, 20S proteasome activity was increased and ubiquitinated protein levels were diminished in response to cadmium in NtUBC1 tobacco. By contrast, proteasome activity was decreased and ubiquitinated protein levels were slightly enhanced by Cd treatment in control tobacco, which is sensitive to Cd. Moreover, the oxidative stress level was induced to a lesser extent by Cd in NtUBC1 tobacco compared with control plants, which is ascribed to the higher activity of antioxidant enzymes in NtUBC1 tobacco. In addition, NtUBC1 tobacco displayed a reduced accumulation of Cd compared with the control, likely due to the higher expression of CAX3 (Ca-2(+)/H+ exchanger) and the lower expression of IRT1 (iron-responsive transporter 1) and HMA-A and -B (heavy metal ATPase). In contrast, atubc1 and atubc1atubc2 Arabidopsis exhibited lower Cd tolerance and proteasome activity than WT. In conclusion, NtUBC1 expression promotes cadmium tolerance likely by removing cadmium-damaged proteins via Ub/26S proteasome-dependent proteolysis or the Ub-independent 20S proteasome and by diminishing oxidative stress through the activation of antioxidant enzymes and decreasing Cd accumulation due to higher CAX3 and lower IRT1 and HMA-A/B expression in response to 50 mu M Cd challenge for 3 weeks.</P>
Bahmani-Oskooee Mohsen,Mohammadian Amirhossein 한국국제경제학회 2021 International Economic Journal Vol.35 No.2
Previous studies have assessed the impact of policy uncertainty on consumption and investment in G7 countries. In this study, we assess its impact on domestic output in the same countries. Furthermore, we argue that its impact could be asymmetric, implying that increased uncertainty affects domestic output at a different rate than decreased uncertainty. Unlike consumption and investment, we find the unanimous outcome in all G7 countries that increased uncertainty hurts domestic output and decreased uncertainty boosts it, though significant long-run asymmetric evidence was found only in the cases of Canada, Japan, and the U.S. Thus, any policy aimed at reducing uncertainty will be growth-enhancing.
JORDAN GENERALIZED DERIVATIONS ON TRIVIAL EXTENSION ALGEBRAS
Bahmani, Mohammad Ali,Bennis, Driss,Vishki, Hamid Reza Ebrahimi,Attar, Azam Erfanian,Fahid, Barahim Korean Mathematical Society 2018 대한수학회논문집 Vol.33 No.3
In this paper, we investigate the problem of describing the form of Jordan generalized derivations on trivial extension algebras. One of the main results shows, under some conditions, that every Jordan generalized derivation on a trivial extension algebra is the sum of a generalized derivation and an antiderivation. This result extends the study of Jordan generalized derivations on triangular algebras (see [12]), and also it can be considered as a "generalized" counterpart of the results given on Jordan derivations of a trivial extension algebra (see [11]).
Korean Trade in 10 Service Industries and Role of the Won? An Asymmetric Analysis
Bahmani-Oskooee Mohsen,백정호 한국국제경제학회 2023 International Economic Journal Vol.37 No.1
International trade includes trade not just in goods but also in services. Introduction of internet technology has helped to boost trade in services by more than trade in goods. What has been the role of the exchange rate in this journey? While many studies have investigated the link between the exchange rate and trade in goods, only three studies in the literature have assessed the impact of exchange rate changes on trade in services. Two have used data from the U.S., and one from China. We add to this new emerging literature by assessing the symmetric and asymmetric effects of changes in the real effective exchange rate of the Korean won on Korean trade in 10 service categories with the rest of the world. Considering the symmetric (linear) models and asymmetric (nonlinear) models to be complementary, we find short-run effects of imports and exports of almost all 10 service industries. Short-run effects translate into the long run in little over 50% of industries. These findings did not change significantly when we considered real trade in services versus nominal trade. Our findings were industry-specific.
Are Devaluations Contractionary in Africa?
Mohsen Bahmani-Oskooee,Abera Gelan 연세대학교 동서문제연구원 2013 Global economic review Vol.42 No.1
As far as the impact of devaluation on domestic production is concerned, African countries have not received much attention in the literature. One study that used panel data arrived at a general conclusion that devaluations are contractionary in Africa. In this paper, we consider the experience of 22 African countries with devaluation and use time series data to show that devaluations are indeed expansionary in eight countries and contractionary in five countries. In the remaining countries, they have no effect.
MOHSEN BAHMANI-OSKOOEE;JEHANZEB CHEEMA 경제연구소 2009 Journal of Economic Development Vol.34 No.1
Previous studies that investigated the short-run (J-curve) and the long-run effects of currency depreciation on the trade balance of Pakistan used aggregate trade data between Pakistan and the rest of the world and provided no evidence of any significant impact. We wonder whether lack of the relation is due to aggregation bias. In this paper, therefore, we go one step further by employing disaggregated data at bilateral level between Pakistan and her 13 major trading partners to determine if we can discover partners whose trade balances react to changes in the real bilateral exchange rate. The results from bounds testing approach are still inconclusive and show that only in half of the cases the real bilateral exchange rate plays a role.
MOHSEN BAHMANI-OSKOOEE;ORHAN KARA 경제연구소 2008 Journal of Economic Development Vol.33 No.1
In 1950 Orcutt conjectured that a country’s trade flows could respond to a change in exchange rate quicker than they do to a change in relative prices. Previous research that supported Orcutt’s hypothesis employed non-stationary data rendering the results to suffer from spurious regression problem. When we account for stationarity of the data by using cointegration and error-correction modeling, no strong evidence is found in support of the Orcutt’s hypothesis. The findings in this paper for developing countries are similar to those found for developed countries.
MOHSEN BAHMANI-OSKOOEE,JEHANZEB CHEEMA 중앙대학교 경제연구소 2009 Journal of Economic Development Vol.34 No.1
Previous studies that investigated the short-run (J-curve) and the long-run effects of currency depreciation on the trade balance of Pakistan used aggregate trade data between Pakistan and the rest of the world and provided no evidence of any significant impact. We wonder whether lack of the relation is due to aggregation bias. In this paper, therefore, we go one step further by employing disaggregated data at bilateral level between Pakistan and her 13 major trading partners to determine if we can discover partners whose trade balances react to changes in the real bilateral exchange rate. The results from bounds testing approach are still inconclusive and show that only in half of the cases the real bilateral exchange rate plays a role.