Related Experiment Video
Updated: Jan 21, 2026
03:20
Studying Chronic Exposure of Mice to Ultraviolet B Radiation
Published on: August 19, 2025
1.9K
New Concerns for Neurocognitive Function during Deep Space Exposures to Chronic, Low Dose-Rate, Neutron Radiation
Munjal M Acharya1, Janet E Baulch1, Peter M Klein2
1Department of Radiation Oncology, University of California, Irvine, California 92697.
Eneuro
|August 7, 2019
Summary
Deep space radiation poses significant neurocognitive risks. Realistic low-dose exposures in mice impaired learning, memory, and neurotransmission, highlighting potential health issues for astronauts.
Area of Science:
- Space medicine
- Neuroscience
- Radiation biology
Background:
- NASA's Mars mission faces challenges from deep space radiation.
- Previous animal studies used unrealistically high acute radiation doses.
- Realistic low-dose rate exposure effects on the central nervous system are unknown.
Purpose of the Study:
- To investigate the neurocognitive effects of realistic, low dose-rate deep space radiation exposure.
- To understand the impact on learning, memory, and neurotransmission.
Main Methods:
- Mice were exposed to a mixed field of neutrons and photons for 6 months at a low dose rate (1 mGy/d).
- Neurocognitive functions, including learning and memory, were assessed behaviorally.
- Hippocampal neuronal excitability and long-term potentiation were measured.
Main Results:
- Chronic low-dose radiation exposure (18 cGy) resulted in diminished hippocampal neuronal excitability.
- Disruptions in hippocampal and cortical long-term potentiation were observed.
- Mice showed severe impairments in learning and memory, alongside distress behaviors.
Conclusions:
- Realistic low-dose rate deep space radiation exposure causes significant neurocognitive deficits.
- Impaired neurotransmission and neuronal function are key mechanisms.
- These findings reveal unexpected risks to neurological function for deep space travel.
Related Concept Videos
02:59Biological Effects of Radiation
17.7K
All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
17.7K
01:23Transfer Function to State Space
774
State-space representation is a powerful tool for simulating physical systems on digital computers, necessitating the conversion of the transfer function into state-space form. Consider an nth-order linear differential equation with constant coefficients, like those encountered in an RLC circuit. The state variables are selected as the output and its n−1 derivatives. Differentiating these variables and substituting them back into the original equation produces the state equations.
In an RLC...
In an RLC...
774
01:21State Space to Transfer Function
562
The conversion of state-space representation to a transfer function is a fundamental process in system analysis. It provides a method for transitioning from a time-domain description to a frequency-domain representation, which is crucial for simplifying the analysis and design of control systems.
The transformation process begins with the state-space representation, characterized by the state equation and the output equation. These equations are typically represented as:
The transformation process begins with the state-space representation, characterized by the state equation and the output equation. These equations are typically represented as:
562
01:25Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant
215
In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
215
01:28Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration
197
Glomerular filtration rate (GFR) can be estimated from serum creatinine using the modification of diet in renal disease (MDRD) formula or the chronic kidney disease–epidemiology collaboration (CKD–EPI) equation. Both methods are widely used in clinical practice to assess kidney function and guide treatment decisions.The MDRD equation does not require weight or height measurements and is normalized to the body surface area of 1.73 m², considered the average adult surface area.
197
02:53Reaction Rate
62.4K
The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...
The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...
62.4K