cotyledon


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cotyledon

 [kot″ĭ-le´don]
1. any subdivision of the uterine surface of the placenta.
2. irregular convex areas on the chorionic surface of the placenta, consisting of two or more stem villi and their many branch villi; by the end of the fourth month the decidua basalis is almost entirely replaced by the cotyledons.

cot·y·le·don

(kot'i-lē'don),
1.
2. In plants, a seed leaf, the first leaf to grow from a seed.
3. A placental unit.
[G. kotylēdon, any cup-shaped hollow]

cotyledon

/cot·y·le·don/ (kot″ĭ-le´d'n)
1. the seed leaf of the embryo of a plant.
2. any subdivision of the uterine surface of the placenta.

cotyledon

(kŏt′l-ēd′n)
n.
1. Botany A leaf of the embryo of a seed plant, which upon germination either remains in the seed or emerges, enlarges, and becomes green. Also called seed leaf.
2. Anatomy One of the lobules constituting the uterine side of the mammalian placenta, consisting mainly of a rounded mass of villi.

cot′y·le′don·ar′y (-ēd′n-ĕr′ē), cot′y·le′don·al (-ēd′n-əl)(-ēd′n-əs), cot′y·le′do·nous (-ēd′n-əs) adj.

cotyledon

[kot′ilē′don]
Etymology: Gk, kotyledon, cup-shaped
one of the visible segments on the maternal surface of the placenta. A typical placenta may have 15 to 28 cotyledons, each consisting of fetal vessels, chorionic villi, and intervillous space.

cot·y·le·don

(kot'i-lē'dŏn)
1. In plants, a seed leaf, the first leaf to grow from a seed.
2. Irregular convex area of the fetal part of the placenta composed of stem villi.
[G. kotylēdon, any cup-shaped hollow]

cotyledon

  1. a part of the plant embryo in the form of a specialized seed leaf that can be thin and papery, as in the castor oil plant, or can act as a storage organ, as in the broad bean, absorbing food from the endosperm. Sometimes it also functions as a leaf after EPIGEAL germination, as in the runner bean. Some ANGIOSPERMS have one cotyledon per seed (MONOCOTYLEDONS) while others have two (DICOTYLEDONS).
  2. a part of the mammalian placenta on which a tuft of villi occurs, particularly in ruminants.

Cotyledon

African genus of the plant family Crassulaceae; contains bufadienolide, cardiac glycosides; causes krimpsiekte (cotyledonosis). Includes C. orbiculata (C. decusata, C. leucophylla), C. umbilicus (Umbilicus rupestris, navelwort, pennywort). Many species have been reclassified as Tylecodon spp.

cotyledon

1. any subdivision of the uterine surface of the human placenta.
2. discrete elevations of chorioallantoic tissue of the ruminant fetal membranes that adhere intimately with the maternal caruncles to form placentomes. See also caruncle.
References in periodicals archive ?
Impact of cotyledon and leaf removal on seedling survival in three species with contrasting cotyledon functions.
Ethylene inhibitors enhanced de novo shoot regeneration from cotyledons of Brassica campestris spp.
The cotyledons contain approximately 22-27 per cent protein and provide a well-balanced complement of essential amino acids (Busson et al.
Damage symptoms at this level include burning of the emerging, immature leaves, showing a degree of wilting and bruising immediately following the event, becoming shrivelled and dark after 24 h, and a thin sliver of bruised tissue along the windward side of the cotyledon.
Grain legumes may be used as edible whole seeds or processed as dehusked-split cotyledons referred to as "dhal" or milled into flours and meals.
In this context, we have recently extensively examined three different modes of STBM preparation: mechanical dissection of fresh placental vinous tissues; in vitro cultures of vinous explants; and perfusion of single placental cotyledons (15).
This result could be explained by the allocation of cotyledon reserves to root elongation instead of shoot elongation, which increases the length (Figure 2B and C) and dry mass (Figure 3B and C) of the root and consequently the whole seedling.
The findings also indicate that the soy cotyledon was more effective because of its higher genistein content.
04) fetal cotyledon CND number but not other measurements of vascularity.
Flax flea beetle adults are around from March, unlike their spring rape specific cousins which tend to attack plants at the cotyledon stage to produce characteristic shot-holing, they invade linseed as they emerge, requiring growers to be on their guard.
Subject were randomly assigned to one of four supplement regimens: 30 grams isolated soy protein (ISP) and 10 grams of cotyledon fiber; 50 grams of ISP and 16.