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Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
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Noble Gases02:54

Noble Gases

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The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
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Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
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ZnSO

Zhe Dong1, Lu Zhang2, Wei Wang2

  • 1Graduate School, Jinzhou Medical University, Jinzhou, Liaoning, China; Key Laboratory of Follicular Development and Reproductive Health of Liaoning Province, Jinzhou Medical University, Jinzhou, Liaoning Province, China.

Theriogenology
|June 3, 2023
PubMed
Summary
This summary is machine-generated.

Zinc sulfate (ZnSO4) protects against premature ovarian failure (POF) by preserving ovarian function and granulosa cell viability. This study highlights ZnSO4 as a potential fertility-preserving agent during chemotherapy.

Keywords:
ApoptosisGranulosa cellsPI3K/AKT/GSK3βPremature ovarian failureReactive oxygen speciesZnSO(4)

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Area of Science:

  • Reproductive Biology
  • Toxicology
  • Biochemistry

Background:

  • Zinc (Zn) is vital for female reproductive health, exhibiting anti-inflammatory and antioxidant properties.
  • Premature ovarian failure (POF) poses a significant threat to fertility, often induced by chemotherapy agents like cisplatin.
  • Understanding the protective mechanisms of zinc in ovarian health is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the protective effects of zinc sulfate (ZnSO4) against cisplatin-induced premature ovarian failure (POF) in Sprague-Dawley (SD) rats and ovarian granulosa cells (GCs).
  • To elucidate the underlying molecular mechanisms involved in ZnSO4's protective action against ovarian damage.

Main Methods:

  • In vivo studies involved treating SD rats with cisplatin and ZnSO4, measuring serum hormone levels (estrogen [E2], follicle-stimulating hormone [FSH]), ovarian index, and assessing ovarian tissue histology.
  • In vitro studies utilized granulosa cells treated with cisplatin and ZnSO4, evaluating intracellular zinc levels, apoptosis, reactive oxygen species (ROS) production, and mitochondrial membrane potential (MMP).
  • The involvement of the PI3K/AKT/GSK3β signaling pathway was investigated.

Main Results:

  • ZnSO4 administration increased serum Zn2+ levels, enhanced E2 secretion, and reduced FSH levels in rats.
  • ZnSO4 improved ovarian index, protected ovarian tissues and vasculature, reduced follicular atresia, and maintained follicular development.
  • In vitro, ZnSO4 restored intracellular Zn2+ levels, inhibited GC apoptosis, reduced cisplatin-induced ROS production, and preserved MMP.
  • ZnSO4 was found to protect against POF by activating the PI3K/AKT/GSK3β pathway, thereby reducing GC apoptosis.

Conclusions:

  • Zinc sulfate demonstrates significant protective effects against premature ovarian failure induced by cisplatin in both in vivo and in vitro models.
  • ZnSO4 preserves ovarian function by mitigating oxidative stress, inhibiting apoptosis, and modulating key signaling pathways.
  • These findings suggest that ZnSO4 holds potential as a therapeutic agent for protecting ovarian health and preserving fertility, particularly in the context of chemotherapy.