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Related Concept Videos

SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

10.2K
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...
10.2K
SN1 Reaction: Kinetics02:05

SN1 Reaction: Kinetics

9.5K
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...
9.5K
SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

14.1K
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...
14.1K
Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

11.1K

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.
11.1K
Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

15.9K
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,...
15.9K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

4.6K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
4.6K

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Updated: Jan 22, 2026

Quantitative Methods to Study Protein Arginine Methyltransferase 1-9 Activity in Cells
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Hacking 9-1-1: Infrastructure Vulnerabilities and Attack Vectors.

Mat Goebel1, Christian Dameff2, Jeffrey Tully3

  • 1Department of Emergency Medicine, University of Massachusetts Medical School-Baystate, Springfield, MA, United States.

Journal of Medical Internet Research
|July 11, 2019
PubMed
Summary
This summary is machine-generated.

The 9-1-1 call-taking system, vital for emergency medical services, faces significant cybersecurity vulnerabilities. These risks could delay critical care and endanger patient safety.

Keywords:
cybersecurityemergency medical dispatchemergency medical service communication systemsemergency medical services

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Area of Science:

  • Emergency medical services
  • Cybersecurity
  • Prehospital care technology

Background:

  • 9-1-1 call centers are essential for prehospital care, handling emergency calls and providing instructions.
  • The technical infrastructure of 9-1-1 systems, including mobile and landline call processing, is complex and interconnected.
  • Increasing reliance on network technology in evolving 9-1-1 systems introduces potential vulnerabilities.

Purpose of the Study:

  • To detail the technical architecture of the 9-1-1 call-taking system.
  • To identify and describe cybersecurity vulnerabilities within this infrastructure.
  • To assess the potential impact of these vulnerabilities on patient care.

Main Methods:

  • Analysis of the technical structure of 9-1-1 call-taking systems.
  • Identification of interconnected technologies used for caller location and information.
  • Review of potential cyberattack vectors and their implications.

Main Results:

  • The interconnected nature of 9-1-1 technologies creates inherent cyber vulnerabilities.
  • Attacks on 9-1-1 infrastructure can range from minor disruptions to severe consequences, including loss of life.
  • Vulnerabilities can lead to delayed emergency medical response and compromised patient outcomes.

Conclusions:

  • The 9-1-1 system's reliance on networked technology presents significant cybersecurity risks.
  • Patient care and public safety are potentially compromised by these vulnerabilities.
  • Further research is needed to develop methods for strengthening 9-1-1 system security against cyber threats.