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Monozygotic twins
Monozygotic twins Twins derived from one egg and one sperm (often called identical twins).
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Sperm
A sperm cell, or spermatozoon (pl. spermatozoa) (in Greek: sperm = semen and zoon = alive), is the haploid cell that is the male gamete. It is carried in fluid called semen, and is capable of fertilising an egg cell to form a zygote. A zygote can grow into a new organism, such as a human. Sperm cells contain half of the genetic information needed to create life. Generally, the sex of the offspring is determined by the sperm, through the chromosomal pair "XX" (for a female) or "XY" (for a male).
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Mono-diet (monophagic diet)
Any regimen characterized by|(a) restriction of food intake to one specific kind of food, or (b) restriction of each meal to one specific kind of food (e.g., porridge alone for breakfast, fruits alone for lunch, and meat alone for dinner).
Monoamine oxidase
MAO. An enzyme that breaks down dopamine. There are two types of MAO "A" and "B." In Parkinson's disease, it is beneficial to block the activity of MAO B.
Monochromat
An individual with only one spectral channel (i.e. retina receptors have the same spectral sensitivity).
Monocid
Monocid is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): cefonicid sodium.
Monoclonal
Literally, coming from a single clone. A clone is the progeny of a single cell. In immunology, monoclonal generally describes a preparation of antibody that is monogenous, or cells of a single specificity.
Monoclonal antibodies
Very pure antibodies produced artificially. Normally used in laboratory tests but have been used experimentally for treatment of some diseases.
Monoclonal antibodies (MAB)
A biological response modifier with unique "homing device" properties. Chemicals or radiation tagged to the MAB may be delivered directly to tumor cells. Or, the MAB itself may be capable of tumor cell destruction.
Monocular depth cues
Relative size, texture gradients, perspective, shadow, height of retina image, interposition, motion parallax.
Monocular vision
A condition in which one eye is blind, or in which one eye refuses to register images in co-ordination with the better eye.
Monocular zone
The areas of the visual field from which light projects only to one of the eyes. See also Binocular Zone.
Monocyte
Large circulating white cell, 2-10% of total white cells, phagocytic, indented nucleus. Migrates to tissues, where it is known as a macrophage.
Monodox
Monodox is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): doxycycline.
Monogalia General Hospital
Monogalia General Hospital is a hospital in Morgantown, West Virginia (USA).
Monoket
Monoket is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): isosorbide mononitrate.
Monokines
Soluble substances secreted by monocytes, which have a variety of effects on other cells.
Monomorphism
Having not male and female, but only one sexual form or manifestation in a species as, for example, in those species of lizard that reproduce by parthenogenesis.
Mononeuropathy
A form of diabetic neuropathy affecting a single nerve. The eye is a common site for this form of nerve damage.|See also: Neuropathy.
Monongahela Valley Hospital
The Monongahela Valley Hospital is a hospital in Monongahela, Pennsylvania, United States.
Monongalia General Hospital
The Monongalia General Hospital is a hospital in Uniontown, Pennsylvania, United States.
Mononucleosis
A viral illness characterized by severe fatigue, swollen glands, sore throat, and fever.
Monoploid
A cell having only one chromosome set (usually as an aberration) or an organism composed of such cells.
Monopril
Monopril is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): fosinopril sodium.
Monopril-hct
Monopril-hct is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): fosinopril sodium; hydrochlorothiazide.
Monoptic stimulation
When only one eye views an image (the other eye being closed or occluded). See also Binoptic Stimulation and Dichoptic Stimulation.
Monosexual
Characterized by either exclusively heterosexual or exclusively homosexual contacts either in genital acts or as a long-term sexuoerotic status.
Monounsaturated Fat
A fat composed mostly of monounsaturated fatty acids.
Monounsaturated fats
Dietary fats, such as olive oil or canola oil, that don't seem to have any affect on blood cholesterol.
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Male factor infertility
Condition in which a male patient is infertile for such reasons as very low sperm count, sperm that cannot swim properly, sperm that are unable to penetrate the egg, or blocked sperm ducts.
Methylation
A biochemical process involving the addition of chemical tags called methyl groups (-CH3) to DNA. Methylation can be a signal for a gene or a section of a chromosome to turn off gene expression and become inactive or "silent".
Minor H antigens
Or minor histocompatibility antigens. A group of proteins (in addition to those encoded by the major histocompatibility complex (MHC) that can cause transplant tissue rejection. Minor H antigens can cause tissue rejection even when donor and recipient are matched for MHC. Immune response to minor H antigens is far less potent than response to MHC-encoded proteins, so the rejection is a slower process.
Mitochondrial heteroplasmy
An atypical condition characterized by the presence of more than one type of mitochondrial DNA in a single individual. Normally, each individual has only one type of mitochondrial DNA, inherited from his or her mother through the egg at fertilization. (Mitochondria from the sperm are systematically eliminated by the egg at fertilization.)Cloned organisms may exhibit mitochondrial heteroplasmy (having a mixture of mitochondria from both the donor cell and the recipient egg) because this elimination system may be bypassed during the cloning process.
Mitochondrion
Plural: mitochondria. A cellular structure in the cytoplasm that provides energy to the cell. Each cell contains many mitochondria. In humans, a single mitochondrion contains 37 genes on a circular mitochondrial DNA, compared with about 35,000 genes contained in the nuclear DNA.
Monozygotic twins
Morula
The preimplantation embryo 3-4 days after fertilization, when it is a solid mass composed of 12-32 cells (blastomeres). After the eight-cell stage, the cells of the preimplantation embryo begin to adhere to each other more tightly, becoming "compacted". The resulting embryo resembles a mulberry and is called a morula (Latin: morus = mulberry).
Multipotent stem cells
Stem cells from the embryo, fetus, or adult, whose progeny are of multiple differentiated cell types and usually, but not necessarily, all of a particular tissue, organ, or physiological system.
Mutation
A change in DNA that alters a gene and thus the gene's product, leading in some cases to deformity or disease. Mutations can occur spontaneously during cell division or can be triggered by environmental stresses, such as sunlight, radiation, and chemicals.
Magnesium sulfate
One of a group of drugs called tocolytics used to stop preterm labor.
Marasmus
A severe case of malnutrition.
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