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Related Concept Videos

SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

10.5K
This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
10.5K
SN1 Reaction: Kinetics02:05

SN1 Reaction: Kinetics

9.7K
In an SN2 reaction, the reaction rate depends on both the type of nucleophile and the substrate. A hindered tertiary alkyl halide is practically inert to the SN2 mechanism despite using a strong nucleophile.
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...
9.7K
SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

14.5K
Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a...
14.5K
Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

11.3K

The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
11.3K
Physiology of Enteric Nervous System and Gut Health01:05

Physiology of Enteric Nervous System and Gut Health

1.0K
The gastrointestinal tract, responsible for the digestion and absorption of nutrients, is safeguarded by the intestinal barrier, which consists of secretory, physical, and immune components. At the forefront is the secretory barrier, composed of essential elements such as mucus, gut microbiota, and defense proteins. They collaborate to break down food particles, facilitate nutrient absorption, and maintain optimal gut health. These secretory components ensure the smooth functioning of the...
1.0K
Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

17.4K
Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
With increased substitution on the alkyl halide,...
17.4K

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Related Experiment Video

Updated: Feb 15, 2026

A Method to Assess Bacteriocin Effects on the Gut Microbiota of Mice
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A Method to Assess Bacteriocin Effects on the Gut Microbiota of Mice

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Gut Microbiota and IGF-1.

Jing Yan1,2, Julia F Charles3,4,5

  • 1Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, 60 Fenwood Road, BTM 6022, Boston, MA, 02115, USA. jyan8@bwh.harvard.edu.

Calcified Tissue International
|January 25, 2018
PubMed
Summary
This summary is machine-generated.

Gut microbiota influence host development by modulating insulin-like growth factor 1 (IGF-1). Microbiota-derived metabolites, like short-chain fatty acids, can stimulate IGF-1 production, impacting host growth.

Keywords:
BoneGrowthIGF-1MicrobiomeMicrobiotaSCFA

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Area of Science:

  • Microbiology
  • Endocrinology
  • Developmental Biology

Background:

  • Host-microbiota coevolution is crucial for development and health.
  • Microbiota play vital roles in host development, even during stress.
  • The insulin-like growth factor 1 (IGF-1) pathway is a key target of microbial influence.

Purpose of the Study:

  • To review the mechanisms by which gut microbiota modulate host IGF-1.
  • To summarize the impact of microbiota-induced IGF-1 on host development.
  • To highlight current research on the microbiota-IGF-1-growth axis.

Main Methods:

  • Literature review of studies investigating the gut microbiota-IGF-1 interaction.
  • Analysis of data on microbiota-derived metabolites and their effect on IGF-1.
  • Examination of research on growth hormone regulation and host sensitivity.

Main Results:

  • Gut microbiota dynamically modulate circulating IGF-1 levels in hosts.
  • Microbiota-derived metabolites, such as short-chain fatty acids, can induce IGF-1 synthesis.
  • The precise mechanisms (growth hormone expression vs. sensitivity) are under investigation.

Conclusions:

  • Gut microbiota are significant regulators of host IGF-1.
  • Microbiota-mediated IGF-1 induction is a critical factor in host development.
  • Further research is needed to fully elucidate the microbiota-IGF-1 axis.