38 research outputs found
Simulating an Airborne Lidar Bathymetry (ALB) System
This study’s focus is on the horizontal and vertical uncertainties associated with ALB measurements due to scattering through the water column. A lidar simulator was constructed and we present its design and preliminary results
Indigenous hydropriming practice for fastening seed germination might induce reciprocal effects in chickpea (Cicer arietinum L.) under “on-farm” seed priming scenario
From the vedic times, the cultivation of crops in India, were meant for sustenance of mankind. The age old practices transferred across generations have being followed by the young and the old without a second thought. The main land agriculture that has adopted several of these practices has witnessed many a kind of ups and downs from replicating these practices. The lack of a strategic scientific validation aided with the misinformation by passing the indigenous knowledge across generations have caused many a kind of deleterious effects too. One of such traditional practice is the soaking of seeds prior to germination that is being scientifically stated as the seed priming which enhances the process of germination. Though the “on- farm” seed priming technology have been pointed out as a sustainable option for the intensification of agriculture in marginal and tribal belts of the country, its recommendation needs prior standardization in and across various crop genotypes. Hence, in this study the effect of different durations of hydropriming on the germination and growth of Chickpea (Cicer arietinum L.) were assessed. BGD 72 variety of Desi and BGD 128 variety of Kabuli were used for the study. It was observed that there occurs wide variation in germination and seedling growth across the intervals of priming and each positive effect is sharply - duration and genotype specific.
Effect of magnetic flux and of electron momentum on the transmission amplitude in the Aharonov-Bohm ring
A characterization of the two-terminal open-ring Aharonov-Bohm interferometer
is made by analyzing the phase space plots in the complex transmission
amplitude plane. Two types of plots are considered: type I plot which uses the
magnetic flux as the variable parameter and type II plot which uses the
electron momentum as the variable parameter. In type I plot, the trajectory
closes upon itself only when the ratio of the arm lengths (of the
interferometer) is a rational fraction, the shape and the type of the generated
flower-like pattern is sensitive to the electron momentum. For momenta
corresponding to discrete eigenstates of the perfect ring (i.e. the ring
without the leads), the trajectory passes through the origin a certain fixed
number of times before closing upon itself, whereas for arbitrary momenta it
never passes through the origin. Although the transmission coefficient is
periodic in the flux with the elementary flux quantum as the basic period, the
phenomenon of electron transmission is shown not to be so when analyzed via the
present technique. The periodicity is seen to spread over several flux units
whenever is a rational fraction whereas there is absolutely no periodicity
present when is an irrational number. In type II plot, closed trajectories
passing through the origin a number of times are seen for being a rational
fraction. The case R=1 (i.e. a symmetric ring) with zero flux is rather
pathological--it presents a closed loop surrounding the origin. For irrational
values, the trajectories never close.Comment: accepted in Int. J. Mod. Phys. B, RevTeX
Human Blood Vessel–Derived Endothelial Progenitors for Endothelialization of Small Diameter Vascular Prosthesis
BACKGROUND:Coronary bypass graft failure as a result of acute thrombosis and intimal hyperplasia has been the major challenge in surgical procedures involving small-diameter vascular prosthesis. Coating synthetic grafts with patients' own endothelial cells has been suggested to improve the patency rate and overall success of bypass surgeries. METHODOLOGY/PRINCIPAL FINDINGS:We isolated endothelial progenitor cells (EPCs) from leftover pieces of human saphenous vein/mammary artery. We demonstrate that EPCs can be expanded to generate millions of cells under low-density culture conditions. Exposure to high-density conditions induces differentiation to endothelial cell phenotype. EPC-derived endothelial cells show expression of CD144high, CD31, and vWF. We then assessed the ability of differentiated endothelial cells to adhere and grow on small diameter expanded polytetrafluoroethylene (ePTFE) tubings. Since ePTFE tubings are highly hydrophobic, we optimized protocols to introduce hydrophilic groups on luminal surface of ePTFE tubings. We demonstrate here a stepwise protocol that involves introduction of hydrophilic moieties and coating with defined ECM components that support adhesion of endothelial cells, but not of blood platelets. CONCLUSION/SIGNIFICANCE:Our data confirms that endothelial progenitors obtained from adult human blood vessels can be expanded in vitro under xenoprotein-free conditions, for potential use in endothelialization of small diameter ePTFE grafts. These endothelialized grafts may represent a promising treatment strategy for improving the clinical outcome of small-caliber vascular grafts in cardiac bypass surgeries
Indigenous hydropriming practice for fastening seed germination might induce reciprocal effects in chickpea (Cicer arietinum L.) under ―on-farm‖ seed priming scenario
518-525From the vedic times, the cultivation of crops in India, were meant for sustenance of mankind. The age old practices transferred across generations have being followed by the young and the old without a second thought. The main land agriculture that has adopted several of these practices has witnessed many a kind of ups and downs from replicating these practices. The lack of a strategic scientific validation aided with the misinformation by passing the indigenous knowledge across generations have caused many a kind of deleterious effects too. One of such traditional practice is the soaking of seeds prior to germination that is being scientifically stated as the seed priming which enhances the process of germination. Though the ―on- farm‖ seed priming technology have been pointed out as a sustainable option for the intensification of agriculture in marginal and tribal belts of the country, its recommendation needs prior standardization in and across various crop genotypes. Hence, in this study the effect of different durations of hydropriming on the germination and growth of Chickpea (Cicer arietinum L.) were assessed. BGD 72 variety of Desi and BGD 128 variety of Kabuli were used for the study. It was observed that there occurs wide variation in germination and seedling growth across the intervals of priming and each positive effect is sharply - duration and genotype specific