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 [o´vah] (L.)
plural of ovum.


Plural of ovum.


Plural of ovum.


Plural of ovum.


Plural of ovum.


(o'vum) plural.ova [L., egg]
1. The female reproductive or germ cell.
2. A cell that is capable of developing into a new organism of the same species. Usually fertilization by a spermatozoon is necessary, although in some lower animals ova develop without fertilization (parthenogenesis). See: conception; fertilization; menstrual cycle; menstruation

alecithal ovum

An ovum with a small yolk portion that is distributed throughout the protoplasm. Synonym: isolecithal ovum

centrolecithal ovum

An ovum having a large central food yolk, as in a bird's egg.

holoblastic ovum

An ovum that undergoes complete cleavage, as opposed to partial or meroblastic cleavage.
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human ovum

The female gamete, required for reproduction. The ovum develops from an oogonium within the graafian follicle of the ovary and matures through the meiotic process of oogenesis. A mature ovum is about 0.13 to 0.14 mm (0.0051 to 0.0055 in) in diameter. At ovulation, the ovum is bounded by a translucent cellular membrane (the zona pellucida), which is connected to a layer of follicular cells (the corona radiata); these cells enclose the cytoplasm, nuclei, and chromatin material. The exact time during which a human ovum is capable of fertilization and further development before degenerating is not known; however, it is probably 24 hr. See: illustration; oogenesis; ovulation

isolecithal ovum

Alecithal ovum.

mature ovum

A secondary oocyte that has completed its second meiotic division as a result of contact with a sperm. The nucleus of the mature ovum becomes the female pronucleus.

meroblastic ovum

An ovum in which only the protoplasmic region undergoes cleavage, characteristic in ova containing a large amount of yolk.

permanent ovum

An ovum ready for fertilization.

primordial ovum

A germ cell that arises very early in the development of the embryo, usually in the yolk sac endoderm, migrates into the urogenital ridge, and is the precursor for the functional gamete.

telolecithal ovum

An ovum in which the yolk is fairly abundant and tends to concentrate in one hemisphere.


Mentioned in: Stool O & P Test

Patient discussion about ova

Q. Is there any difference between brown eggs and white eggs? My fitness instructor suggested me to have brown eggs instead of white eggs so is there any difference between brown eggs and white eggs?

A. I have to agree with you. Never heard of any difference between the two and it doesnt sound reasonable that one is better to your health than the other...

Q. why the renal doctor told my husband that he needs to eat a dozen of egg a week for protein,how it will help? it won`t afect his cholesterol,also i would like to know what role the protein plays on his treatment and what other foot its rich in protein that he can can take,without causing problems to his health.

A. if i understand correctly, your husband is diabetic. like my grandfather he probably developed a "Diabetic nephropathy" which is a long name to: kidney being destroyed because of blood vessels clotted by diabetes. because of that destruction the kidneys allow protein to go out in the urine. this is a dangerous situation,a protein in the name of "albomin" helps our blood to hold fluids in blood vessels. without it fluid will leave the blood and go to our organs. not a good situation. so he needs a lot of proteins.
here is a list of a 100 protein rich foods:

Q. How can I catch Salmonella? Yesterday I ate a mousse which was made from raw eggs. Could I have caught Salmonella?

A. Salmonella infections usually resolve in 5-7 days and often do not require treatment unless the patient becomes severely dehydrated or the infection spreads from the intestines. Persons with severe diarrhea may require rehydration, often with intravenous fluids (IV). Antibiotics are not usually necessary unless the infection spreads from the intestines.

More discussions about ova
References in periodicals archive ?
When mice inhaled 40 mg/ml methacholine, the groups treated with tomatidine had suppressed Penh values compared to the OVA group (Figure 1(a)).
administration of the following substances (all in 30 fl volume): (a) nontreated mice (Mock group)--received PBS as mock vaccination; (b) nonvaccinated allergic positive control group (PBS)--mice that received PBS; (c) OVA group (OVA)--10 [micro]g rOVA; (d) TLR2 ligand group ([Pam.sub.2][CysK.sub.4] + OVA)--0.5 mM [Pam.sub.2][CysK.sub.4] + 10 [micro]g rOVA; (e) TLR7 ligand group (CL264 + OVA)--0.5 mM CL264 + 10 [micro]g rOVA; (f) TLR2/7 dual-ligand group (CL531 + OVA)--0.5 mM CL531 + 10 [micro]g rOVA; and (g) TLR2/7 dual-ligand control (no OVA) group (CL531)--0.5 mM CL531 (for comparison of experimental groups see also Repository Figure 5).
Rats were sensitized by subcutaneous injection (1 mL) of a saline suspension containing 0.2% OVA (Sigma, St.
OVA specific IgE in serum was analyzed by ELISA (Cayman Chemical).