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相关概念视频

ortho–para-Directing Deactivators: Halogens01:24

ortho–para-Directing Deactivators: Halogens

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Halogens are ortho–para directors. They are more electronegative than carbon. Therefore, as ring substituents, they can withdraw electrons through the inductive effect and deactivate the aromatic ring towards electrophilic substitution. Halogens also have an electron-donating resonance effect on the ring, which influences the orientation of the incoming electrophile. If an electrophile attacks at the ortho or the para position, the halogen donates electrons and stabilizes the intermediate...
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Oogenesis02:07

Oogenesis

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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Directing Effect of Substituents: ortho–para-Directing Groups01:14

Directing Effect of Substituents: ortho–para-Directing Groups

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Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate...
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Anatomical Terminology01:20

Anatomical Terminology

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Knowledge of anatomy is essential to understand human biology and medicine. Anatomists and health care professionals use standard terminology to describe the human body with more precision and no ambiguity. Anatomical terms have mostly Greek and Latin-derived roots. Because these languages are rarely used in conversation, the meaning of words remains the same. Each term is made up of a root in between the prefixes and suffixes. The root of a term often refers to an organ, tissue, or condition,...
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Author Spotlight: Understanding DNA Damage Response in Mammalian Oocytes and Preimplantation Embryos
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希腊东正教教会的希腊东正教教会.

Heather N Bitar1

  • 1Palliative Medicine Supportive Care Medicine City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA. hbitar@coh.org.

Cancer treatment and research
|October 18, 2023
PubMed
概括
此摘要是机器生成的。

希腊东正教基督徒将死亡视为与上帝永生的生命,接受医疗护理,但反对长期的人工生命支持. 提前护理规划对于尊重个体生命终端偏好至关重要.

关键词:
生命周期末期的做法护理的目标 护理的目标希腊东正教的信仰希腊东正教基督徒 希腊东正教基督徒希腊东正教教会 希腊东正教教会希腊东正教信仰 希腊东正教信仰

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科学领域:

  • 神学和生物伦理学
  • 宗教研究和医疗保健

背景情况:

  • 希腊东正教教会在全球拥有3亿信徒,是第二大基督教教派.
  • 对永生的核心信念塑造了对死亡的积极观点,将其视为'与上帝同在'.
  • 神被认为是终极的治疗者,通过祈祷和教会参与来促进治疗.

研究的目的:

  • 在希腊东正教信仰中,确定影响生命末期医疗决策的共同主题.
  • 探索这些信仰的历史和上下文框架.
  • 引导医疗保健提供者了解患者对终身护理的不同观点.

主要方法:

  • 本章综合了神学原则,并讨论了它们与医学伦理学的交叉关系.
  • 它考察了这些信念对预先护理计划和治疗目标的影响.
  • 该研究强调需要对有关生活质量和无益护理的个性化讨论.

主要成果:

  • 传统医疗干预措施通常被接受.
  • 人工生命支持仅在提供有意义的恢复现实的希望的情况下才被认为是合理的.
  • 有一个原则反对加快死亡和过度延长自然死亡过程.

结论:

  • 尊重患者的自主权需要理解希腊东正教信仰中的个人生命终结信仰.
  • 及时提前的护理计划和关于生活质量的公开讨论至关重要.
  • 医疗团队必须避免假设,并参与个性化护理讨论.