Embryonic

The dynamic picture of a vapor at a pressure near is then somewhat as follows. If P is less than P , then AG for a cluster increases steadily with size, and although in principle all sizes would exist, all but the smallest would be very rare, and their numbers would be subject to random fluctuations. Similarly, there will be fluctuations in the number of embryonic nuclei of size less than rc, in the case of P greater than P . Once a nucleus reaches the critical dimension, however, a favorable fluctuation will cause it to grow indefinitely. The experimental maximum supersaturation pressure is such that a large traffic of nuclei moving past the critical size develops with the result that a fog of liquid droplets is produced. 

In laboratory tests, appHcation of DMAC to the skin of pregnant rats has caused fetal deaths when the dosages were close to the lethal dose level for the mother. Embryonal malformations have been observed at dose levels 20% of the lethal dose and higher. However, when male and female rats were exposed to mean DMAC concentrations of 31,101, and 291 ppm for 6 h per day over several weeks, no reproductive effects were observed (6). 

E. Robertson, in E. Robertson, ed., Teratocarcinomas and Embryonic Stem Cells A Practical Approach, IRL Press, Oxford, 1987, p. 71. 

Muscle tissue is unique in its ability to shorten or contract. The human body has three basic types of muscle tissue histologically classified into smooth, striated, and cardiac muscle tissues. Only the striated muscle tissue is found in all skeletal muscles. The type of cells which compose the muscle tissue are known as contractile cells. They originate from mesenchymal cells which differentiate into myoblasts. Myoblasts are embryonic cells which later differentiate into contractile fiber cells. 

Studies in which pregnant rats and mice were exposed to 1250 ppm of methylene chloride for seven hours a day on days 6—15 of gestation indicated no significant maternal, embryonal, or fetal toxicity (34). Methylene chloride was shown to be nonteratogenetic to either animal at the concentration studied. 

Homeoboxes code for homeodomains, sequences of 60 amino acids that function as the DNA-binding regions of transcription factors. Each homeo-box gene in Drosophila is expressed only in its own characteristic subset of embryonic cells, and almost every embryonic cell contains a unique combination of homeodomain proteins. 

Thiopheneglyoxal has been found to be only moderately active against Newcastle disease virus and influenza virus in embryonated eggs. ... 

Entstehungs-art, -weise, /. mode of origin, -moment, n. moment of formation, -zen-tnun, n. center of origin, -zustand, m. nas-centstate embryonic state. 

Keim-. embryonic, germinal, germination, -ap-parat, m,. -germinating apparatus. 

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