Exam: Cambridge English: C1 Advanced (CAE)

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: Relating to or caused by light, especially light that can produce chemical changes, such as ultraviolet light.

Example: The actinic rays from the sun can cause chemical reactions in certain materials.

Definition: In a way that relates to or is caused by light, especially ultraviolet light, which can cause chemical reactions.

Example: The light was filtered actinically to enhance the chemical reactions.

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 property of radiation that causes chemical changes, especially in the presence of light.

Example: The actinism of sunlight is essential for photosynthesis in plants.

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: Relating to or resembling a star-like shape, often used to describe certain marine animals or structures that have a radial symmetry.

Example: The actinoid structure of the sea star allows it to capture prey effectively.

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.

Definition: Relating to the measurement of light intensity, especially in terms of its effect on photosynthesis or other processes.

Example: The actinometric measurements were crucial for the solar energy study.

Definition: This is the process of measuring how much heat is produced by electromagnetic radiation, particularly sunlight.

Example: Actinometry is essential in studying the effects of sunlight on plant growth.