Category: Ra-Re

Opposition to something, or the ability to withstand something. For example, some forms of the staphylococcus bacterium are resistant to treatment with antibiotics.

Something left behind. With residual disease, the disease has not been eradicated.

In medicine, a physician who has finished medical school and is receiving training in a specialized area, such as surgery, internal medicine, pathology, or radiology. Board certification in all medical and surgical specialties requires the satisfactory completion of a residency program and successful completion of a specialty board examination.

Any person, animal, plant, soil or substance in which an infectious agent normally lives and multiplies. The reservoir typically harbors the infectious agent without injury to itself and serves as a source from which other individuals can be infected. The infectious agent primarily depends on the reservoir for its survival. It is from the reservoir that the…

1. A place where something such as water is kept in reserve.2. The part of a device in which something is kept in reserve or stored, as an Ommaya reservoir.3. For an infectious agent, an animal, person, plant, soil, or other substance in which the agent normally abides.

Surgical removal of part of an organ.

A study that compared results from a treated group and a control group. The control group may receive no treatment, a placebo, or a different treatment. See also blinded study, control group, double-blinded study.

The internal genital structures of the female include the ovaries, Fallopian tubes, uterus (womb) and vagina. The ovaries or “egg sacs” are a pair of female reproductive organs located in the pelvis, one on each side of the uterus. Each ovary is about the size and shape of an almond. The ovaries have two functions: they produce eggs (ova) and female hormones. Each month,…

The eggs and sperm are the reproductive cells. Each mature reproductive cell is haploid in that it has a single set of 23 chromosomes containing half the usual DNA amount. Except for the eggs and sperm, each cell in the human body — there are 100 trillion cells in each of us — contains the entire human genome,…

The production of offspring. Reproduction need not be sexual; for example, yeast can reproduce by budding.