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2 天前 · CRISPR (/ ˈ k r ɪ s p ər /) (an acronym for clustered regularly interspaced short palindromic repeats) is a family of DNA sequences found in the genomes of prokaryotic organisms such as bacteria and archaea. [2] These sequences are derived from DNA fragments of bacteriophages that had previously infected the prokaryote. ...
- CRISPR
- Escherichia coli
1 天前 · Fibonacci sequence. A tiling with squares whose side lengths are successive Fibonacci numbers: 1, 1, 2, 3, 5, 8, 13 and 21. In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn .
2 天前 · Demographics of Earth. Population pyramid of the world in 2022 by the UN. Population. Over 8,000,000,000 (estimated) Fertility rate. 2.27 (2021) Earth has a human population of over 8 billion as of 2024, with an overall population density of 50 people per km 2 (130 per sq. mile). Nearly 60% of the world's population lives in Asia, with almost 2 ...
1 天前 · The G20 or Group of 20 is an intergovernmental forum comprising 19 sovereign countries, the European Union (EU), and the African Union (AU).[3][4] It works to address major issues related to the global economy, such as international financial stability, climate change mitigation and sustainable development.[5] The G20 is composed of most of ...
1 天前 · Diabetes mellitus, often known simply as diabetes, is a group of common endocrine diseases characterized by sustained high blood sugar levels. [10] [11] Diabetes is due to either the pancreas not producing enough insulin, or the cells of the body becoming unresponsive to the hormone's effects. [12] Classic symptoms include thirst, polyuria ...
23 小時前 · Public Safety Officer Medal of Valor. Medal for Merit (no longer awarded) Medal of Freedom (no longer awarded) President's Award for Distinguished Federal Civilian Service. National Medal of Arts. National Humanities Medal. National Medal of Science. National Medal of Technology and Innovation.
2 天前 · Electrons and a compact nucleus of protons and neutrons. Atoms are the basic particles of the chemical elements. An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically bound swarm of electrons. The chemical elements are distinguished from each other by the number of protons that are in their atoms.
