0
We're unable to sign you in at this time. Please try again in a few minutes.
Retry
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
Retry
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
Other Articles |

RICKETS IN CHICKS:  IV. THE EFFECT OF HEAT AND EXPOSURE TO AIR ON THE STABILITY OF VITAMIN D

G. F. HEUSER; L. C. NORRIS
Am J Dis Child. 1929;38(3):481-489. doi:10.1001/archpedi.1929.01930090033004.
Text Size: A A A
Published online

Cod liver oil is the richest natural source of two vitamins which play an important part in the diet of both human beings and animals, vitamins A and D. That the former is readily destroyed by oxidation, through exposure to air, is generally accepted, but in spite of evidence to the contrary it is still believed by many people, particularly by those dealing with the utilization of cod liver oil, that vitamin D cannot be destroyed by exposure to air or that it is so extremely resistant to such oxidation that the question of destruction by exposure to air need be given no consideration.

It seems probable that this conception of the stability of vitamin D has arisen from the fact that this vitamin was distinguished from vitamin A through a difference in the relative rate of oxidation when heated and exposed to air. As early as 1921, Mellanby1

Topics

Sign in

Create a free personal account to sign up for alerts, share articles, and more.

Purchase Options

• Buy this article
• Subscribe to the journal

First Page Preview

View Large
First page PDF preview

First Page Preview

View Large
First page PDF preview

Figures

Tables

References

Correspondence

CME
Also Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
Your answers have been saved for later.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.
Submit a Comment

Multimedia

Some tools below are only available to our subscribers or users with an online account.

Sign in

Create a free personal account to sign up for alerts, share articles, and more.

Purchase Options

• Buy this article
• Subscribe to the journal

Related Content

Customize your page view by dragging & repositioning the boxes below.

Jobs
brightcove.createExperiences();