Definition: Relating to acrosomes, which are structures found in sperm cells that help them penetrate the outer layers of an egg during fertilization.

Example: The acrosomal reaction is crucial for fertilization in many species.

Definition: A cap-like part at the front of a sperm cell that helps it to break into an egg by releasing special enzymes.

Example: The acrosome contains enzymes that help the sperm penetrate the egg's outer layer.

Definition: A chemical compound that is used in making synthetic materials and can be found in some foods when they are cooked at high temperatures. It is known to be harmful to health.

Example: Acrylamide is formed when certain foods are cooked at high temperatures, such as frying or baking.

Definition: A type of chemical compound that is formed from acrylic acid, which can be a salt or an ester.

Example: The laboratory synthesized a new acrylate for use in coatings.

Definition: A clear, colorless liquid that is used to make certain types of rubber and fibers, and is also important in chemical reactions to create other substances.

Example: Acrylonitrile is commonly used in the production of synthetic fibers.

Definition: A type of protein that plays a key role in muscle movement and helps maintain the shape of cells. It works together with another protein called myosin to allow muscles to contract and cells to move.

Example: Actin plays a crucial role in muscle contraction and cellular movement.

Definition: This word describes something that is related to or situated on the part of a radially symmetrical animal where the tentacles spread out or where the mouth is located.

Example: The actinal surface of the sea anemone is where the tentacles are located.

Definition: A group of 15 radioactive elements in the periodic table, starting with actinium and ending with lawrencium, known for their similar chemical properties.

Example: The actinide series includes elements like uranium and plutonium, which are used in nuclear reactors.

Definition: A chemical element that is radioactive and is found in uranium ores. It is used to produce alpha rays and has properties similar to another element called lanthanum. The most stable form of this element has a long half-life.

Example: Actinium is used in radiation therapy for cancer treatment.

Definition: A device used to measure the strength of radiation, especially sunlight, often used in weather studies.

Example: The scientist used an actinometer to measure the intensity of sunlight during the experiment.