Biomedical subjects

R Beason

Publications and source records attributed to R Beason.

4 recordsLinked to original sources

PubMed1996

Does the avian ophthalmic nerve carry magnetic navigational information?

The bobolink (Dolichonyx oryzivorus) uses the earth's magnetic field as one source of directional information for its migratory orientation. However, the location and structure of the magnetoreceptors that transduce the magnetic information to the nervous system are unknown. Because treatment with a strong magnetic pulse results in a change in the direction of orientation, one of the receptors is thought to involve a magnetizable material such as magnetite. The effects of the magnetizing treatment can be abolished (i.e. the bird returns to its original orientation) by blocking the ophthalmic branch of the trigeminal nerve, but the ability of the bird to select and maintain a direction is not affected. These results are consistent with the hypothesis that a magnetizable material such as magnetite is part of the magnetoreceptors that are associated with the ophthalmic nerve.

Journal Article↗

PubMed1995

Behavioural evidence for the use of magnetic material in magnetoreception by a migratory bird

The biophysical mechanism of vertebrate magnetic sensory perception has not been completely resolved. We here provide evidence for the use of a magnetic material (probably magnetite) by a vertebrate to detect the earth's magnetic field. The role of magnetite in bobolink (Dolichonyx oryzivorus) orientation was assessed by magnetizing the birds with a magnetic pulse in one of three orientations. Bobolinks magnetized with different polarities were significantly oriented in directions different from one another and from their controls. Treatment with a second pulse having the opposite polarity to the first resulted in random orientation for each group. These results indicate an effect specific to a particle-based magnetoreceptor. The use of magnetite particles for magnetoreception is not in conflict with other reports on the use of photopigments for this purpose. The two mechanisms could be used in a complementary manner for detecting the same or different aspects of the magnetic field.

Journal Article↗

PubMedDate not supplied

Evaluation of a needle-free intravenous access system.

Needle-stick injuries are one of the most severe hazards faced by nurses today. The most physically and emotionally devastating type of injury is from a needle contaminated with human immunodeficiency virus (HIV), but far more likely to occur is infection with other blood-borne pathogens, especially hepatitis B. The daily threat of needle-stick injuries adds yet another dimension of concern to the stresses inherent in working in a health care facility. Health care workers at greatest risk are those who manipulate needles and draw blood samples on a regular basis. With this concern in mind, a study was launched to evaluate a needle-free I.V. access system with respect to the following research objectives: 1) to assess the prevention/reduction of needle-stick risks and injuries; 2) to identify associated reduction in expenses; 3) to implement product and ease of use; and 4) to assess nursing satisfaction levels. This article describes the methodology used and the results of the study.

Catheters, Indwelling↗

PubMedDate not supplied

Antineoplastic vesicant extravasation.

The administration of antineoplastic drugs is an almost-daily responsibility of the I.V. nurse, and the possibility of extravasation is ever-present. The nurse's thorough knowledge of these drugs, including their actions, side effects, and the appropriate interventions in the event of an extravasation, is essential to providing optimal I.V. care to patients. This article is based on the extravasation management policies and procedures of Spartanburg Regional Medical Center, Spartanburg, S.C.

Antidotes↗