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ICH's mission is to achieve greater harmonisation worldwide to ensure that safe, effective and high quality medicines are developed, and registered and maintained in the most resource …

Chi (/ kaɪ / ⓘ KY, also / xiː / HEE; [1][2] uppercase Χ, lowercase χ; Greek: χῖ) is the twenty-second letter of the Greek alphabet. Its value in Ancient Greek was an aspirated velar stop /kʰ/ …

Modern English is written with a Latin-script alphabet consisting of 26 letters, with each having both uppercase and lowercase forms. The word alphabet is a compound of alpha and beta, …

In Modern Greek, the voiceless velar fricative (with its allophone, the voiceless palatal fricative [ç], occurring before front vowels) originated from the Ancient Greek voiceless aspirated stop /kʰ/ …

Two letters, “A” and “I,” also constitute words. Until fairly recently (until 1835), the 27th letter of the alphabet (right after "z") was the ampersand (&). The English Alphabet is based on the Latin …

KH、Kh、kh 或 kH 是一个二合字母，可以指： 清軟腭塞音的送氣音，国际音标中的符号为 /kʰ/ 。 [1] [2] 在臺羅及白話字中，代表清軟腭塞音 送氣音 /kʰ/ ，如khí。 氫化鉀的化學式，寫作KH。 …

4 天之前 · Subsequent to α-C–H addition, the H atom of the β-agostic C–H bond is transferred directly to the hydride ligand of (iPr PCP)IrH + to give a dihydrogen ligand. The overall …

3 天之前 · Here, we report that enones can serve as diverse alkylidene sources for catalyst-controlled selective C–H alkylation and/or alkylidenation of various nucleophiles. Treatment of …

2025年3月5日 · The C.I.A. director, John Ratcliffe, and the national security adviser, Michael Waltz, both confirmed the pause in intelligence support but suggested it could be short-lived if …