Israde-Alcántara et al. (1) presented evidence from Lake Cuitzeo sediments and argued that it supports the Younger Dryas (YD) impact hypothesis of Firestone et al. (2) for a major extraterrestrial impact event “involving multiple airburst(s) and/or ground impact(s) at 12.9 ka.” Firestone et al. (2) did not specify the details of the impact but proposed that it had “continentwide effects” and wa...

This study was carried out to analyze the impact of lines, egg shell colour and intraction between (Line ⁎ eggshell colours) on quality characteristics hatching parameters assess correlation these traits in three local quail eggs (desert, brown white). A total 409 were collected from female quails during 16 weeks divided into five groups basis spot for each line. The results revealed that there...

1. In the cytoplasm of oocytes of stage Y(0), prior to the appearance of yolk, one observes a few scattered profiles of endoplasmic reticulum and numerous filamentous mitochondria, usually distributed at random but sometimes clustered. As the nuclear membrane begins to bulge outward, small granules and short rods appear in the perinuclear cytoplasm and endoplasmic reticulum becomes more promine...

The purposes of the study were to assess and compare the validity of both 300-yd and 500-yd shallow water run (SWR) tests to predict peak aerobic power (VO2peak). Participants included 18 women and 18 men who performed a graded exercise treadmill test to predict VO2peak and then performed a 300-yd and 500-yd SWR for time. In addition to SWR times, other independent variables included age, gende...

Evaluation of a variable Yd from certain measured variable(s) Xi(s), by making use of their system-specific-relationship (SSR), is generally referred as the indirect measurement. Naturally, the SSR may stand for a simple data-transformation process (Xi(s) Yd) in a given case, but a set of equations (fi({Yd}) = Xi, d, i = 1, 2, ..., N), or even a cascade of different such processes (“Xi(s) I Yd(...

Electron microscope examination of thin sections of bullfrog (Rana catesbeiana) ovarian oocytes has shown the presence of mitochondria containing yolk-crystal inclusions in oocytes of all sizes, from 160 to 1500 micro mean diameter. The hexagonally shaped yolk-crystals have major periodicities of 73.8 +/- 10.7 A (n = 100). Several forms of modified mitochondria, observed in the smaller oocytes,...

Electron microscope examination of thin sections of bullfrog (Rana catesbeiana) ovarian oocytes has shown the presence of mitochondria containing yolk-crystal inclusions in oocytes of all sizes, from 160 to 1500 μ mean diameter . The hexagonally shaped yolk-crystals have major periodicities of 73 .8 f 10.7 A (n = 100) . Several forms of modified mitochondria, observed in the smaller oocytes, ma...

Thin sections of the oocyte periphery and surrounding granulosa layer from 1--5 day preovulatory follicles were examined by transmission electron microscopy. With the use of certain procedures in tissue preparation, notably the tannic acid method, numerous particles in the range of 15--40 nm with a mean diameter of 27 nm were observed in both extra- and intracellularly. The particles were abund...

Proliferation of vascular smooth muscle cells (VSMCs) is postulated to be one of the key events in the pathogenesis of atherosclerosis and restenosis. We investigated whether YD-3, a lowmolecular weight, non-peptide compound, could modulate proliferation of VSMCs in vitro and restenosis after balloon angioplasty in vivo. We examined the effect of YD-3 on thrombininduced VSMC proliferation by [(...