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2009年1月1日 · Hemoglobin H (Hb H) disease is the most severe non-fatal form of α-thalassemia syndrome, mostly caused by molecular defects of the α-globin genes in which α-globin expression is decreased.

Hemoglobin H disease, also called alpha-thalassemia intermedia, is a disease affecting hemoglobin, the oxygen carrying molecule within red blood cells. It is a form of Alpha-thalassemia which most commonly occurs due to deletion of 3 out of 4 of the α-globin genes. [1]

This video is Part 2 of the Alphabet ABC Phonics Series, covering letters H, I, J, and K. This series goes through each of the letters, starting with A and ending with Z. Each letter is...more.

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HbH disease is characterised by a moderate anaemia (Hb typically ~80g/L, but can range from 60-100g/L). Haemolytic episodes are triggered by infections, especially parvovirus B19 infection and exposure to oxidant drugs. Pregnancy exacerbates the anaemia due to a dilutional effect.

铅笔的石墨(graphite /ˈɡræfaɪt/) 芯的硬度主要有两种表示法，一种美国用的数值表示法，另一种是其他国家用的HB表示法： B：Black，数字越大，越软，越黑H：Hard，数字…

2018年8月17日 · Learn the alphabet, phonics, letter sounds, vocabulary words, and uppercase and lowercase letters. This is a phonics ABC song for kids.The Alphabet Song is great for teaching and learning the alphabet and phonics.

布氏硬度试验（Brinell scale）是压入硬度试验之一种，其测量值用HB或BHN表示，布氏硬度值称为BHN（Brinell Hardness Number），常被简写为HB (Hardness Brinell)。