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Search Results: 1 - 10 of 15656 matches for " Arun; Singh Khanuja "
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Cost-effective Approaches for in vitro mass Propagation of Rauwolfia serpentina Benth. Ex Kurz.
Manoj Kumar Goel,Arun Kumar Kukreja,Suman Preet Singh Khanuja
Asian Journal of Plant Sciences , 2007,
Abstract: The present study describes a highly efficient and a very cost effective micropropagation protocol for exsitu conservation of an important medicinal plant, Rauwolfia serpentina using glass beads as support matrix in liquid culture medium and as a potential alternative to agar and market grade sugar as carbon source. Glass beads can replace the conventionally used gelling agent agar without compromising the quality of the in vitro regenerated shoots/plantlets of R. serpentina. This practice could be helpful in achieving more than 95% reduction in cost media for the production of single regenerated shoot, moreover, the glass beads can be reused for indefinite time after proper acid wash.
Genetic transformation studies and scale up of hairy root culture of Glycyrrhiza glabra in bioreactor
Mehrotra,Shakti; Kumar Kukreja,Arun; Singh Khanuja,Suman Preet; Nath Mishra,Bhartendu;
Electronic Journal of Biotechnology , 2008,
Abstract: the study was undertaken to induce hairy roots in glycyrrhiza glabra in leaf explants and to optimize the nutritional requirement for its growth kinetics at shake flask and bioreactor level. pathogenecity of agrobacterium depends upon transformation ability of strain and age, type, and physiological state of explants. agrobacterium rhizogenes strain k599 was used to infect leaf explants of g. glabra. explants of different age groups were obtained from 2 to 5 weeks old in vitro grown cultures. bacterial strain k599 could induce hairy roots in 3 and 4 weeks old leaf explants cultured on b5, ms, nb and wp basal semi-solid medium. leaf explants of 2 and 5 weeks old culture were not responsive to bacterial infection in terms of hairy root induction. maximum transformation frequency (tf) of tested bacterial strain was 47% obtained in 3 weeks old explants after 25 days of incubation on ms basal semi solid medium. nb and b5 both media composition showed 20% of transformation frequency after 28 and 38 days respectively. wp medium did not support induction of roots in cultured leaf explants infected with a. rhizogenes strain k599even after 50 days of incubation. further, when all the four media combinations were tested for root growth it was found that though wp was not responsive for hairy root induction, yet all four basal media supported hairy root growth and a gradual increase in fresh weight biomass was observed with an increase in culture duration. however amongst all, the nb medium composition supported best growth of hairy roots followed by ms, b5 and wp media. about 20 times increase in root biomass on fresh weight basis was recorded after 45days of culture in nb medium. initial inoculum of roots (0.18 g. f.wt./ flask) containing 50 ml of liquid culture medium produced 3.59 g (f. wt.) biomass. a fast growing hairy root clone g6 was grown in a 5 l capacity mechanically agitated bioreactor provided with a nylon mesh septum. after 30 days of sterile run, 310 g of root b
Genetic Variability in Germplasm Accessions of Capsicum annuum L  [PDF]
Shrilekha Misra, Raj Kishori Lal, Mahendra Pandurang Darokar, Suman Preet Singh Khanuja
American Journal of Plant Sciences (AJPS) , 2011, DOI: 10.4236/ajps.2011.25074
Abstract: Capsicum annuum is the most widely cultivated species of peppers (chilies) in the world. For culinary purposes, its fruits are used for pungency (capsaicin) and also color (capsanthin). Capsaicin is also used for medicinal purposes particularly in anti-inflammatory formulations. Genetic divergence among 38 accessions collected from diverse locations in India (28 from Uttar Pradesh, 5 from Assam, 3 from Maharashtra and 2 from Uttaranchal), was estimated from the data pooled over 3 consecutive years for 15 morphological, growth and chemotypic characters that included days to first and second flowering, fruit onset, plant height, primary, secondary and tertiary branches, leaf surface area, fruit length and diameter, fruit surface area, fresh and dry fruit weight, capsaicin and capsanthin content. Based on this characterization the plants could be grouped into 7 clusters wherein substantial diversity among accessions was indicated by the wide range of D2 values (752.901 - 1918683.00). Accessions with distinct identity were marked, which are likely to be quite suitable for breeding through hybridization combining desirable traits. The accessions labeled number 38, 27, 26, 14 and 24 to high capsaicin content (%); 35, 23, 3, 16, 29 and 11 for high capsanthin content (%) and 26 and 27 for dual purpose had characteristics desirable. Above accessions could be utilized in hybridization programme for C. annuum crop improvement.
Impact of breaking bad news to patients and their relatives
Sweta Khanuja,Vrushali Dongalikar,Rajat Arora,Arun Kumar Gupta
International Journal of Students' Research , 2011, DOI: 10.5549/ijsr.1.4.141-142
Is Isostatic Rebound in Slow Spreading Gakkel Ridge of Arctic Region Due to the Climate Change? A Case Study  [PDF]
Arun Kumar, L. Sunil Singh
International Journal of Geosciences (IJG) , 2012, DOI: 10.4236/ijg.2012.32037
Abstract: Ny-Alesund, Swalbard region which is located in the mid-ocean ridge of the Arctic Ocean, and named Gakkel ridge, is the slowest spreading ridge of the global system. In the present study an attempt has been made to associate isostatic rebound using GPS campaign data collected at Ny-Alesund area. The Artic Region Campaign GPS network was established in 2009. The network consists of three campaign mode station. The distance between GPS point is about ~30 km. The preliminary results of our investigation appear broadly consistent with the recent tectonic activity in western Svalbard. The resultant velocity vector is 14.84 mm·yr–1 with an azimuth of 27.67°N and a vertical displacement of 7.62 ± 3.0 mm·yr–1 is estimated in Swalbard, in which we presume Glacial Isostatic Rebound (5.1 mm·yr–1) and post glacial geological process (Present Day Ice Melting, erosion, and shore line deposits) of 2.52 mm per year in the study area.
Active Deformation Measurements at Mishmi Complex of Eastern Himalayan Syntaxis  [PDF]
M. Devachandra Singh, Arun Kumar
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.44068

We focus the geodynamic status of Eastern Himalayan Syntaxis with reference to Tibetan Plateau,Chinaand Burmese Arc using the crustal deformation constraints with GPS observation. We have used the GPS data, surface geomorphic constraints and compared the existing Pn velocity and Anisotropy [1], determined the crustal velocity of Tibetan Block and North andEast Chinablock as 2 - 8 mm/yr and 6 - 11 mm/yr considering the EHS as stable block. The lack of crustal deformation studies in EHS poses a gap in its geodynamic setup. The present attempt is first time in EHS to estimate crustal deformation by GPS. We presented GPS results from 10 stations along with one permanent station covering the EHS 2 - 3 mm/yr with an azimuth of N460. It reveals that the EHS is moving very slow rates, which accommodates the maximum strain (after Great Earthquake of8.7 M, Arunachal China Border 1950). The neotectonic activities are recorded along the major rivers traversing EHS follow the major thrusts and faults.

Transient Stability Improvement of Power System Using Non-Linear Controllers  [PDF]
Rekha Chaudhary, Arun Kumar Singh
Energy and Power Engineering (EPE) , 2014, DOI: 10.4236/epe.2014.61002

This paper presents the design of a non-linear controller to prevent an electric power system losing synchronism after a large sudden fault and to achieve good post fault voltage level. By Direct Feedback Linearization (DFL) technique robust non-linear excitation controller is designed which will achieve stability enhancement and voltage regulation of power system. By utilizing this technique, there is a possibility of selecting various control loops for a particular application problem. This method plays an important role in control system and power system engineering problem where all relevant variables cannot be directly measured. Simulated results carried out on a single machine infinite bus power system model which shows the enhancement of transient stability regardless of the fault and changes in network parameters.

Robust Optimal H Control for Uncertain 2-D Discrete State-Delayed Systems Described by the General Model  [PDF]
Arun Kumar Singh, Amit Dhawan
Journal of Signal and Information Processing (JSIP) , 2016, DOI: 10.4236/jsip.2016.72011
Abstract: This paper investigates the problem of robust optimal H control for uncertain two-dimensional (2-D) discrete state-delayed systems described by the general model (GM) with norm-bounded uncertainties. A sufficient condition for the existence of g-suboptimal robust H state feedback controllers is established, based on linear matrix inequality (LMI) approach. Moreover, a convex optimization problem is developed to design a robust optimal state feedback controller which minimizes the H noise attenuation level of the resulting closed-loop system. Finally, two illustrative examples are given to demonstrate the effectiveness of the proposed method.
Effect of Heat Source/Sink on Free Convective Flow of a Polar Fluid between Vertical Concentric Annuli  [PDF]
Arun Kumar Singh, Ashok Kumar Singh
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.59148
Abstract: The purpose of this paper is to find the effect of heat source/sink parameter on free convective flow of a polar fluid in open-ended vertical concentric annuli. Exact solutions of the non-dimensional differential equations describing the flow model have been obtained one by one for two different cases of source and sink. To observe the effect of the physical parameters such as source/sink and vertex viscosity, the numerical results of the velocity and microrotational velocity are finally shown on the graphs.
Dr. R. N. Sharma
Singh Arun
Indian Journal of Plastic Surgery , 2009,
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