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X-ray

X-ray is a procedure used to exam, treat, or photograph with X-rays. X-rays are any of the electromagnetic radiations with extremely short wavelengths.

X-ray diffraction

X-ray diffraction is a method for studying microscopic crystal form and structure.

Xylose

Xylose is a type of sugar derived from the xylans in plant cell walls; it is used to evaluate intestinal function.

Yaw

Yaw is the left or right angle of the vehicle nose, relative to the direction of motion, in the horizontal plane.

Yeast

A yeast is a unicellular fungus that belongs to the phylum fungi, family Saccharomycetaceae.

Yeast-malt broth

Yeast-malt broth is a medium used to induce sporulation and reduce vegetative growth in the cultivation of fungi.

Yellow Fever

Yellow Fever is an acute infectious disease of subtropical and tropical New World areas, caused by a filterable virus transmitted by a mosquito of the genus Aedes and characterized by jaundice and dark-colored vomit resulting from hemorrhages.

Zeta potential

Zeta potential is the electrostatic potential of a molecule or particle. It is usually measured by electrophoretic mobility and is related to the surface potential and a measure of the electrostatic forces of repulsion the particle or molecule is likely to meet when encountering another of the same sign of charge.

Zone-forming fungi

Streptomyces levoris, or the zone-forming fungi has naturally alternating vegetative mycelial and spore ring periodicity that can be easily observed by the naked eye. The zone-forming fungi are used to test if space flight factors have an effect on ring formation in fungi.