Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Body Temperature01:25

Body Temperature

4.8K
The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
4.8K
Body Temperature01:07

Body Temperature

1.5K
Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C...
1.5K
Effects of Temperature on Free Energy02:11

Effects of Temperature on Free Energy

28.4K
The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
28.4K
Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

89.1K
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
89.1K
Factors Affecting Body Temperature01:28

Factors Affecting Body Temperature

9.4K
As a nurse, it is vital to understand the factors affecting body temperature to monitor variations and effectively evaluate deviations from regular.
Factors may  include:
9.4K
Increased Body Temperature01:25

Increased Body Temperature

7.5K
A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
7.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Cell surface engineering for inhibition of breast cancer cell motility through modulation of mechanotransduction and focal adhesion dynamics.

Journal of tissue engineering·2025
Same author

3D Spheroid Cultures for Salivary Gland Tissue Engineering: Effects of Fibroblast on Epithelial Cell Function.

Life (Basel, Switzerland)·2025
Same author

Segmentation-Based Blood Blurring: Examining Eye-Response Differences in Gory Video Viewing.

Sensors (Basel, Switzerland)·2025
Same author

MYB74 transcription factor guides de novo specification of epidermal cells in the abscission zone of Arabidopsis.

Nature plants·2025
Same author

Floating electrode-dielectric barrier discharge-based plasma promotes skin regeneration in a full-thickness skin defect mouse model.

Biomedical engineering letters·2024
Same author

Immediate and Late Effects of Pulse Widths and Cycles on Bipolar, Gated Radiofrequency-Induced Tissue Reactions in in vivo Rat Skin.

Clinical, cosmetic and investigational dermatology·2023
Same journal

Cluster assisted soft-landing hub (CLASH): An instrument for surface desorption and deposition using a pulsed cluster ion source.

The Review of scientific instruments·2026
Same journal

Influence of pre-ionization parameters on multi-channel discharge characteristics of field-distortion switch gaps.

The Review of scientific instruments·2026
Same journal

A Joule-Thomson low-temperature scanning tunneling microscope with vector magnet and rotatable scanning head.

The Review of scientific instruments·2026
Same journal

Fiber-optic triggering of a two-stage high-current linear transformer driver with laser energy below 100 μJ.

The Review of scientific instruments·2026
Same journal

Optimization of laboratory-scale x-ray absorption spectroscopy (XAS) apparatus for nuclear fuel research.

The Review of scientific instruments·2026
Same journal

Compressed multi-scale entropy and its application in mechanical fault diagnosis.

The Review of scientific instruments·2026
See all related articles

Related Experiment Video

Updated: Feb 5, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

7.6K

Ultrafast time-resolved fluorescence at cryogenic temperature.

Jiwon Son1, Taiha Joo1

  • 1Department of Chemistry, Pohang University of Science and Technology, Pohang 37673, South Korea.

The Review of Scientific Instruments
|September 7, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a new time-resolved fluorescence apparatus achieving 45 fs resolution at low temperatures. This cryogenic system enables detailed studies of molecular dynamics and spectroscopy.

More Related Videos

Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
09:50

Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures

Published on: June 28, 2017

9.1K
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

18.2K

Related Experiment Videos

Last Updated: Feb 5, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

7.6K
Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
09:50

Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures

Published on: June 28, 2017

9.1K
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

18.2K

Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Time-resolved fluorescence is crucial for studying molecular dynamics.
  • Achieving high time resolution at cryogenic temperatures presents significant technical challenges.
  • Existing methods often lack the necessary resolution or versatility for low-temperature studies.

Purpose of the Study:

  • To develop a novel time-resolved fluorescence apparatus with ultra-high time resolution at cryogenic temperatures.
  • To enable direct measurement of time-resolved fluorescence spectra without reconstruction.
  • To characterize the performance and demonstrate the capabilities of the developed system.

Main Methods:

  • Utilized a continuous flow cryostat with a customized vacuum shroud.
  • Employed fluorescence upconversion gating by sum-frequency generation.
  • Incorporated a reflective Cassegrain microscope objective for efficient fluorescence collection.
  • Developed in situ methods for time delay adjustment to compensate for group velocity dispersion.

Main Results:

  • Achieved a time resolution of 45 femtoseconds (fs) at cryogenic temperatures.
  • Demonstrated direct measurement of time-resolved fluorescence spectra with high resolution.
  • Estimated heat dissipation and actual sample temperature for improved experimental design.
  • Successfully measured time-resolved fluorescence spectra of prodan, showcasing excited-state charge transfer dynamics.

Conclusions:

  • The developed apparatus offers unprecedented time resolution for low-temperature fluorescence studies.
  • This system significantly advances the capability to investigate ultrafast molecular dynamics in condensed phases.
  • The design considerations and demonstrated performance provide a valuable tool for spectroscopic research.