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相关概念视频

The Aufbau Principle and Hund's Rule03:02

The Aufbau Principle and Hund's Rule

To determine the electron configuration for any particular atom, we can build the structures in the order of atomic numbers. Beginning with hydrogen, and continuing across the periods of the periodic table, we add one proton at a time to the nucleus and one electron to the proper subshell until we have described the electron configurations of all the elements. This procedure is called the aufbau principle, from the German word aufbau (“to build up”). Each added electron occupies the subshell of...
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
Hückel's Rule Diagram of π MOs: Frost Circle01:08

Hückel's Rule Diagram of π MOs: Frost Circle

The Frost circle or the inscribed polygon method is a graphical method for determining the relative energies of π molecular orbitals (MOs) for planar, fully conjugated, and monocyclic compounds. This method was first described by A. A. Frost and Boris Musulin in 1953.
A Frost circle is constructed by drawing a polygon whose number of edges is equal to the number of carbons of the given cyclic system, with one of the vertices pointing down. Then, a circle is drawn enclosing the polygon so that...
Wald-Wolfowitz Runs Test I01:17

Wald-Wolfowitz Runs Test I

The Wald-Wolfowitz test, also known as the runs test, is a nonparametric statistical test used to assess the randomness of a sequence of two different types of elements (e.g., positive/negative values, successes/failures). It examines whether the order of the elements in a sequence is random or if there is a pattern or trend present. This nonparametric test applies to any ordered data despite the population and sample data distribution, even if a higher sample size is available.
The test works...
Wald-Wolfowitz Runs Test II01:17

Wald-Wolfowitz Runs Test II

The Wald-Wolfowitz runs test, commonly referred to as the runs test, is a nonparametric test used to assess the randomness of ordered data. The test evaluates the number of runs, which are consecutive sequences of similar elements within the data. If the number of runs is significantly higher or lower than expected, the data is considered non-random, indicating a detectable pattern or structure.
For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...
Routh-Hurwitz Criterion I01:15

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Consider an electrical power grid, where stability is essential to prevent blackouts. The Routh-Hurwitz criterion is a valuable tool for assessing system stability under varying load conditions or faults. By analyzing the closed-loop transfer function, the Routh-Hurwitz criterion helps determine whether the system remains stable.
To apply the Routh-Hurwitz criterion, a Routh table is constructed. The table's rows are labeled with powers of the complex frequency variable s, starting from the...

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同样纠的76号:瓦尔斯的协议.

Xiaoyan Li1, Paul Wicks2, Andrew Brown3

  • 1Department of Neurology, Duke University, Durham, NC, USA.

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|October 10, 2024
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概括
此摘要是机器生成的。

沃尔斯的饮食,强调蔬菜和健康的脂肪,可能不会减缓肌缩侧面硬化症 (ALS) 的进展. 这种饮食在试验中导致体重减轻,这是ALS患者的担忧.

关键词:
这就是ALS.瓦尔斯的协议协议.神经炎症是一种神经炎症.氧化应激是一种氧化应激.

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科学领域:

  • 神经学 神经学
  • 营养科学 营养科学
  • 饮食干预 饮食干预

背景情况:

  • 瓦尔斯饮食是一种经过修改的古石器时代饮食模式,侧重于含有营养丰富的食物,如绿叶蔬菜,水果和omega-3s,同时限制谷物,豆类和加工品.
  • 假设它可以减轻炎症,氧化应激和线粒体功能障碍,可能会影响肌缩性侧面硬化症 (ALS) 的进展.
  • 在ALS动物模型中对饮食成分的研究产生了不一致的结果.

研究的目的:

  • 评估瓦尔斯饮食及其成分在减缓肌缩侧面硬化症 (ALS) 进展方面的潜力.
  • 评估与瓦尔斯饮食相关的风险,特别是有关ALS患者减肥的风险.

主要方法:

  • 审查关于瓦尔斯饮食及其成分与ALS有关的现有研究.
  • 分析涉及瓦尔斯饮食或类似饮食模式的队列研究,动物模型和临床试验.
  • 检查低碳水化合物,低血糖指数饮食对体重和ALS进展的影响.

主要成果:

  • 虽然一些研究表明,某些饮食成分 (例如,胡卜素,欧米茄-3脂肪酸) 对ALS风险有潜在的益处,但在人类研究中,没有证实瓦尔斯饮食本身会减缓ALS进展.
  • 瓦尔斯饮食以其严格的性质,低碳水化合物和低血糖指数为特征,在多发性硬化症临床试验中导致显著的体重减轻 (7.2%的BMI).
  • 体重减轻是ALS (PALS) 患者已知的负面预后因素,与疾病进展的加快和生存时间的减少有关.

结论:

  • 由于缺乏证据和潜在风险,不建议使用瓦尔斯饮食来减缓ALS的进展.
  • 在临床试验中观察到的显著体重减轻是ALS (PALS) 患者的主要担忧,因为它与较差的结果有关.
  • 需要进一步的研究来理解饮食和ALS进展之间的复杂关系,但目前的证据不支持瓦尔斯饮食用于此目的.