Tóm tắt
Improved practices are needed to minimise soil erosion and related
agrochemical transport from cotton fields during rain. We evaluated two
options available to cotton growers, namely retention of surface cover and
controlling wheel traffic, using simulated rain on a hill–furrow system
on a well-aggregated black Vertosol. A companion paper explores effects on
pesticide transport. Increasing cover resulted in an increase in the rain
ultivar by
use the fetus lacks the appropriate enzyme systems, clearance of toxic
substances takes place via the placenta and maternal liver. Thus, a suitable
in vitro system can effectively differentiate between
primary and secondary drug effects. In the present study, 13-day-old fetal
testis, at the stage of incipient differentiation, were cultured for 4 days
in vitro in the presence of graded doses of caffeine,
theophylline or theobromine. It was found that explants exposed to caffeine or
theobromine differentiated normally, developing seminiferous cords made up of
Sertoli and germ cells, soon followed by the differentiation of functionally
active Leydig cells appearing in the newly formed interstitium. However,
explants exposed to theophylline failed to develop seminiferous cords and, as
a consequence, Leydig cells. In conclusion, insights obtained from different
experimental methods, such as organ culture or whole organism studies, are not
always identical. It may be prudent, therefore, to take into account that
certain experimental techniques, despite providing valuable information, may
require confirmation by other
