What's the difference between chalaza and yolk?

Chalaza


Definition:

  • (n.) The place on an ovule, or seed, where its outer coats cohere with each other and the nucleus.
  • (n.) A spiral band of thickened albuminous substance which exists in the white of the bird's egg, and serves to maintain the yolk in its position; the treadle.

Example Sentences:

Yolk


Definition:

  • (n.) The yellow part of an egg; the vitellus.
  • (n.) An oily secretion which naturally covers the wool of sheep.

Example Sentences:

  • (1) Whether hen's egg yolk can be used as a sperm motility stimulant in the treatment of such conditions as asthenospermia and oligospermia is subjected for further study.
  • (2) Results obtained from cumulative labeling and pulse-labeling and chase experiments with cells from late gastrulae, yolk plug-stage embryos, and neurulae showed that the 30S RNA is an intermediate in rRNA processing and is derived from 40S pre-rRNA and processed to 28S rRNA.
  • (3) The wall of the yolk sac thickens as a result of this infolding and the densely packed capillaries.
  • (4) When foods such as dairy products contain large numbers of egg yolk-negative strains of S. aureus, the PPSA agar has the advantage over egg yolk containing media such as Baird-Parker agar that fewer suspect colonies have to be confirmed.
  • (5) In lipid extracts of yolk, more than 90% of the radioactivity was as unchanged cholecalciferol and 5% as 25-hydroxycholecalciferol.
  • (6) This study provides evidence for a maternal yolk factor associated with increased tolerance and resistance of larvae to copper.
  • (7) Both genes are expressed in the fetal liver, gut, and visceral endoderm of the yolk sac and are repressed shortly after birth in the liver and gut.
  • (8) After clusters of pigmented epithelial cells have rested immobile in the yolk sac of Blennius pholis for 2-4 days (Trinkaus, '88), their constituent cells transform into mesenchymal, dendritic melanocytes.
  • (9) The patient, a 28-year-old woman, in her ninth week of pregnancy, was operated on for stage Ia, mixed germ cell tumor (grade 3 immature teratoma + yolk sac tumor) of AFP decreased to the normal level.
  • (10) Fe2+ and L-ascorbic acid induced oxidation of cholesterol was investigated in liposomes of egg yolk phosphatidylcholine (PC).
  • (11) Cadmium, anti-visceral yolk sac antibody (AVYS) and trypan blue all inhibited pinocytosis in a concentration-dependent fashion when added to the culture medium, although at low concentrations trypan blue was slightly stimulatory.
  • (12) Although small amounts of AFP are synthesized by sharks in the liver, the greatest site of synthesis is actually the stomach, with smaller amounts synthesized in the intestinal mucosa; no synthesis was observed in the shark yolk sac.
  • (13) In three experiments with semen samples from a single individual capacitated at 4 degrees C for 1, 2 or 3 days in TEST-Yolk buffer we obtained 33, 30 and 34 sperm karyotypes respectively.
  • (14) A stem cell line has been obtained with cell culture, having a germ cell character and a yolk sac configuration.
  • (15) We postulate that the apposition of trophotaenial epithelium to the internal ovarian epithelium constitutes a placental association equivalent to a noninvasive, epithelioform of an inverted yolk sac placenta.
  • (16) The histological characteristics and the presence of laminin in the stroma suggested that the malignant tumors belonged to the category of yolk sac tumors.
  • (17) PLA2-II was over ten times more potent than PLA2-I, although its lipolytic activity toward egg-yolk was even slightly weaker (73%) than that of PLA2-I.
  • (18) The majority of testicular germ cell tumors in adults are accompanied by neoplastic intratubular germ cells; these cells were uniformly absent in ten pure yolk sac tumors (endodermal sinus tumors) of the testicle in children studied morphologically and immunohistochemically.
  • (19) The beta-globin gene remained inactive at the fetal stage, whereas the normal A gamma-globin gene was expressed beyond the embryonic (yolk sac) stage into the fetal stage of development and then became inactive in adult erythroid cells.
  • (20) The yolk spheres, which were free of precipitates, gave the characteristic signal of the nitrogen K-edge.

Words possibly related to "chalaza"