科学英雄:詹姆斯·E·K·希尔德雷斯博士
Journal of health care for the poor and underserved
|April 25, 2024
概括
希尔德雷斯博士是一位传染病专家,在COVID-19大流行期间成为国家关键人物. 他的专业知识导致了FDA疫苗委员会和拜登的角色.
科学领域:
- 传染性疾病 传染性疾病
- 公共卫生政策 公共卫生政策
- 学术卫生科学 学术卫生科学
背景情况:
- 希尔德雷斯博士在传染病方面的丰富经验.
- 他的领导力在梅哈里医学院,一个著名的历史黑人学术健康科学中心.
- 在COVID-19大流行期间,公共卫生的不断变化的格局.
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00:26Hydrogen Bonds
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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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01:15Hydrolysis
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Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
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01:08Hydrolysis of ATP
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The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids.
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine...
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine...
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02:59Enthalpy
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01:25Aquaporins
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01:04Hydrogen Bonds
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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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