Abstract. Variable physical conditions such as vertical turbulent exchange, internal wave, and mesoscale eddy action affect the availability of light nutrients for phytoplankton (unicellular algae) growth. It is hypothesized that changes in ocean temperature may density stratification, which hamper exchange. In order to quantify variations northeast Atlantic Ocean, we sampled a latitudinal tran...

In previous work, we have shown that recent updated standard solar models cannot reproduce the radial profile of the sound speed at the base of the convective zone and fail to predict the photospheric lithium abundance. In parallel, helioseismology has shown that the transition from differential rotation in the convective zone to almost uniform rotation in the radiative solar interior occurs in...

Context. Atomic diffusion is believed to cause the abundance anomalies observed in AmFm stars. However, the detailed process has still not been well-established. For instance, two possible scenarios for the diffusion theory are presently envisaged. They differ mainly by the depth from which the abundance anomalies emanate. The first scenario predicts that the abundances are modified in the supe...

Autotrophic denitrification was measured in the southwestern coastal Black Sea, where the Bosporus Plume injects oxidized chemical species (especially O(2) and [Formula: see text]) into the oxic, suboxic, and anoxic layers. Prominent oxygen intrusions caused an overlap of [Formula: see text] and sulfide at the same station where autotrophic denitrification activity was detected with incubation ...

The influence of extended convective mixing (overshoot) on asymptotic giant branch stellar evolution is investigated in detail. The extended mixing is treated timedependently, and the efficiency declines exponentially with the geometric distance from the convective boundary. It has been considered at all convective boundaries, including the He-flash convection zone in the intershell region whic...

In this study, numerical simulations using the Environmental Fluid Dynamics Code model were conducted to elucidate effects of flow structures in recirculation zone on solute storage based junction angle. Numerical performed at a angle 30° 90° with momentum flux ratio 1.62. The simulation results revealed that an increase caused length and width strengthened development helical motion. motion in...

To study the migration of chick spinal cord neurons, we labeled individual cells in the ventricular zone with recombinant retroviruses, then identified their progeny histochemically. First, we analyzed cell mixing in the ventricular zone. Some clones labeled at early neural tube stages spread widely along both the dorsoventral and rostrocaudal axes. However, clones labeled later were confined t...