dunaliella salina was isolated from maharlu salt lake in shiraz, iran, and was analyzed forthe effects of salinity stress on its growth, pigment content and ascorbate peroxidase activity. growth,expressed as number of cells ml-1, which was most rapid at 2 m nacl, was reduced at salinity extremes.during the exponential phase of growth, increasing salinity from 0.5 to 4 m nacl increased chl a fro...

Plasmids play an important role in the virulence and antibiotic resistance of Salmonella. Salmonella carry plasmids having different size and number. Plasmid profile analysis of single isolates of Salmonella typhimurium and Salmonella enteritidis revealed the presence of 4- plasmid profiles. Salmonella serovars produce several Type III secretions including Sop-E and Sop –B. Soap E is detected b...

We have explored the mechanical properties, electronic structures and phase transition behaviors of three designed new phases for element boron from ambient condition to high-pressure of 120 GPa including (1) a C2/c symmetric structure (m-B₁₆); (2) a symmetric structure (c-B₅₆) and (3) a Pmna symmetric structure (o-B₂₄ ). The calculation of the elastic constants and phonon dispersions shows tha...

The first and second hyperpolarizabilities ~b and g! of eight molecules at a fundamental wavelength of 1064 were measured by gas-phase electric-field-induced second-harmonic generation ~EFISH!, gas-phase hyper-Rayleigh scattering ~HRS!, and liquid-phase HRS experiments. The EFISH measurements give accurate values of b and g for these molecules in the gas phase, and the HRS measurements show tha...

In this paper, the relationship between initial crystalline behavior and annealing conditions in pulsed laser deposition (PLD)-made Nd-Fe-B Pr-Fe-B films with rare-earth-rich composition is discussed. The compositions are prepared via PLD. An process necessary to obtain 2-14-1 phase of hard magnetic properties because all as-deposited have an amorphous structure. conventional annealing, crystal...

Growth phase-dependent gene regulation has recently been demonstrated to occur in Bordetella pertussis, with many transcripts, including known virulence factors, significantly decreasing during the transition from logarithmic to stationary-phase growth. Given that B. pertussis is thought to have derived from a Bordetella bronchiseptica-like ancestor, we hypothesized that growth phase-dependent ...

avian intestinal spirochaetosis (ais) is an intestinal infection caused by anaerobic spirochaetes of the genus brachyspira, including b. pilosocoli. the purpose of this study was isolation and identification of b. pilosocoli from laying hen flocks, located in mashhad suburb, khorasan razavi province, iran, and investigating the frequency of the infection. one hundred and eighty cloacal swab sam...

degradation of dry matter (dm) and nitrogen (n) in fresh or frozen-thawed alfalfa and ryegrass was studied by using in situ technique. the forages were labeled with 15n during growth in a glasshouse, harvested at similar growth phase, and fresh (f) or frozen-thawed (ft) samples were incubated in the rumen of 3 sheep. there was no difference (p>0.05) between forage type (s) for the immediately s...

Causal Dynamical Triangulations (CDT) is a lattice formulation of quantum gravity, suitable for Monte-Carlo simulations which have been used to study the phase diagram model. It has four phases characterized by different dominant geometries, denoted $A$, $B$, $C$ and $C_b$. In this article we analyse $A-B$ $B-C$ {phase} transitions in case where topology space that three-torus. This completes C...