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Zoom lenses (sometimes referred to as "true" zoom) are ideally parfocal, in that focus is maintained as the lens is zoomed (i.e., focal length and magnification changed), which is convenient and has the advantage of allowing more accurate focusing at maximal focal length then zooming back to a shorter focal length to compose the image.
Scientist using an optical microscope in a laboratory. The optical microscope, also referred to as a light microscope, is a type of microscope that commonly uses visible light and a system of lenses to generate magnified images of small objects. Optical microscopes are the oldest design of microscope and were possibly invented in their present ...
Reactome: navigable map of human biological pathways, ranging from metabolic processes to hormonal signalling (Ontario Institute for Cancer Research, European Bioinformatics Institute, NYU Langone Medical Center, Cold Spring Harbor Laboratory) SABIO-RK: database for biochemical reactions and their kinetic properties; WikiPathways
WASHINGTON (Reuters) -FBI Director Christopher Wray and Homeland Security Secretary Alejandro Mayorkas declined to appear publicly on Thursday before a U.S. Senate committee to discuss national ...
JERUSALEM/BEIRUT (Reuters) -Israel said on Monday there was progress in talks about a Lebanon ceasefire and indicated Russia could play a part by stopping Hezbollah rearming via Syria, although ...
JJ Peterka scored the lone shootout goal, and the Buffalo Sabres beat the Calgary Flames 3-2 on Saturday. Tage Thompson and Zach Benson scored first-period goals, and the Sabres earned their third ...
Biological specimens in an elementary school science lab. A biological specimen (also called a biospecimen) is a biological laboratory specimen held by a biorepository for research. Such a specimen would be taken by sampling so as to be representative of any other specimen taken from the source of the specimen. When biological specimens are ...
The founder of experimental biology and the first person to challenge the theory of spontaneous generation by demonstrating that maggots come from eggs of flies. [57] Population genetics: Ronald A. Fisher, Sewall Wright, J. B. S. Haldane [58] Protozoology: Antonie van Leeuwenhoek (1632–1723) [9] First to produce precise, correct descriptions ...