A comparative study was made of the morphology and histology of
three major groups of light organs in the genus Lampanyctus of the
family Myctophidae for the species, L. leucopsarus, L. ritteri,
L. nannochir, and L. regalis. The species can be divided according
to their ranges in depth, the first...
Early embryo development is dependent on maternally derived RNA and protein synthesized during oogenesis. In the bovine embryo this dependence lasts until the 8-16 cell stage, at which time embryonic transcripts become essential for continued development. One proposed mechanism for this transition from maternal to zygotic control of development (maternal...
Antarctic Ice Sheet mass balance and, hence, sea level change is affected by the floating extensions of outlet glaciers and ice streams that take up about 44% of the coastline (Drewry et al., 1982) and are referred to as "ice shelves". Ice sheet mass loss accelerates when these ice shelves...
Sodium dodecyl sulfate polyacrylamide gel electrophoresis and
zymography were used in two separate experiments to determine the tissue
source and type of plasminogen activator (PA) produced by bovine
blastocysts. Twelve-14 d blastocysts were collected at slaughter from
estrous synchronized, superovulated and artificially inseminated Holstein
cows. In Experiment I, blastocysts were...
Expression of membrane-type matrix metalloproteinases (MT) and tissue inhibitors of matrix metalloproteinases (TIMP) was evaluated in sheep embryos and uterus during the pre- and peri-implantation periods. Embryos and uterine samples were surgically collected from ewes on days 9, 11, 13, and 15 of pregnancy (n=3 ewes/day) and of the estrous...