in vitro propagation of rose has played a very important role in rapid multiplication of species with desirable traits and production of healthy and disease-free plants. micropropagation using nodal segments of rosa canina under different combinations of bap, ga3 and naa on ms and vs, medium was investigated. the results showed that the highest shoot proliferation was obtained on vs medium cont...

This paper proposes a new family of discontinuous PWM strategies to control the quasi-Z-source nine-switch inverters (qZS-NSI). The presented provide buck and boost inversion capabilities, suitable for common-frequency different-frequency modes operation. Accordingly, two different shoot-through (ST) approaches are introduced compared. first approach uses three-leg ST, while second single-leg S...

St Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] is an important warm season turf and pasture grass. In vitro tissue culture of St Augustinegrass could serve as an important mean for its improvement through genetic transformation as well as induced somaclonal variation. To optimize tissue culture conditions for plant regeneration of St Augustinegrass, tissue culture responses of 11 ex...

Na SO induced regulation of some key morpho-physiological characteristics in Sorghum were 2 4 examined to investigate the effect of Na SO on germination and morphology of Sorghum that was conducted 2 4 at Botany Department University of Gujrat. The variety used in this experiment was SSG-77. Plants were subjected for 30 days to sand culture that were salinized with four salt levels [T (control)...

In this paper, an embedded half-bridge Z-source inverter based on gamma structure is proposed. contrast with the classical inverter, proposed can generate zero voltage levels in output. High gain and low stress capacitors are main advantages of converter. The value boost factor increased by changing both shoot-through (ST) duty cycle turns ratio transformer. operating principle converter four m...

this paper presents the new topology of three phase on line uninterruptible power supply (ups) by employing t-source inverter (tsi) with maximum constant boost pulse width modulation (pwm) control and the results are compared with the conventional uninterruptible power supply (ups). the conventional ups consists of voltage source inverter (vsi) with step up transformer or dc-dc booster which de...

The tiny vascular axis of the embryo emerges post-embryonically as an elaborate and critical infrastructure, pervading the entire plant system. Its expansive nature is especially impressive in trees, where growth and development continue for extended periods. While the shoot apical meristem (SAM) orchestrates primary morphogenesis, the vascular system is mapped out in its wake in the provascula...

The synchronous buck circuit is in widespread use to provide “point of use” high current, low voltage power for CPU’s, chipsets, peripherals etc. In the synchronous buck converter, the power stage has a “high-side” (Q1 below) MOSFET to charge the inductor, and a “Low-side” MOSFET which replaces a conventional buck regulator’s “catch diode” to provide a low-loss recirculation path for the induct...

Sulfur dioxide is a controversial preservative used in winemaking. Given its potential toxicity, it of great interest to find alternatives aimed at replacing or reducing sulfur dioxide. The objective was assess the antioxidant effects grapevine-shoot extract with 99% stilbenes (ST-99), major compounds (trans-resveratrol and trans-?-viniferin) their mixture (1:3.9) by measuring reactive oxygen s...

in this paper, a new topology for boost z-source inverterbased on switched-inductor cell is proposed. the operating modes of the proposed inverter are analyzed and also a suitable control method to generate the trigger signals of the inverter is presented. having a common earth between the input source and inverter and capability to generate a higher voltage gain by using lower amounts of the d...