The Readjustment of the Peripheral Lung Motor Mechanism after Bilateral Vagotomy

It has been shown by Carlson and Luckhardt (1) in crucial experiments (1 to 2 hours) that destruction of the medulla or section of the vagi in the frog leads immediately to a permanent hypertonus or incomplete tetanus of the lung neuro-muscular mechanism, which makes the lung practically non-functional and useless as a respiratory organ. The present work however, was undertaken with the idea of ascertaining whether this hypertonic condition observed by these authors is permanent or temporary

Electric propulsion options for the SP-100 reference mission

Analyses were performed to characterize and compare electric propulsion systems for use on a space flight demonstration of the SP-100 nuclear power system. The component masses of resistojet, arcjet, and ion thruster systems were calculated using consistent assumptions and the maximum total impulse, velocity increment, and thrusting time were determined, subject to the constraint of the lift capability of a single Space Shuttle launch. From the study it was found that for most systems the propulsion system dry mass was less than 20 percent of the available mass for the propulsion system. The maximum velocity increment was found to be up to 2890 m/sec for resistojet, 3760 m/sec for arcjet, and 23 000 m/sec for ion thruster systems. The maximum thruster time was found to be 19, 47, and 853 days for resistojet, arcjet, and ion thruster systems, respectively

Mechanisms of superconductivity investigated by nuclear radiation

Investigation focused on the behavior of superconducting magnet and its constituent materials during and after exposure to nuclear radiation. The results will indicate the feasibility of their use in diverse applications and various environments

A CO2 Monitoring and Control System for Plant Growth Chambers

Author Institution: Botany Department and Phytotron, Duke UniversityPATTERSON, DAVID T. AND JOHN L. HITE. A CO2 monitoring and control system for plant growth chambers. Ohio J. Sci. 75(4): 190, 1975

Alpha radioactivity of the lunar surface at the Surveyor 5, 6, and 7 landing sites

Alpha radioactivity of lunar surface at Surveyor 5, 6, and 7 landing site

Flesh Fly Larvae as an Indicator of Hypophyseal Effects

The alleged influence on the growth and rate of development from feeding pituitary gland substance has been principally studied on vertebrates, and for this reason, it seemed desirable to determine how some of the invertebrates would react to this gland substance, in whose body no organ comparable to an endocrine gland has been demonstrated

A Scribofacilograph for Labeling Kymographic Tracings

The ordinary laboratory routine of labeling kymographic tracings involves at best a rather tedious and arduous task which consists either of holding the hand unsupported well above the carbonized paper and writing upon it with a stylus in the form of some pointed instrument, or writing over the rod of an iron stand or some other inconvenient support for the hand. Furthermore, the carbonized paper must be securely held and especially where there are drafts of air while the labeling is being done, and as a result the fingers become coated with carbon, so that notebooks, clothing, etc., which are handled or touched directly thereafter may become badly smeared and blackened with carbon

A Study of the Movements of the Empty Stomach in the Mollusca

Our knowledge concerning the variations of the gastric activity in the various animal groups is still very incomplete and this is notably true in the case of the invertebrates. The present investigation is limited to two species of marine and one specie of terrestrial mollusca, which in so far as I am aware, represents the first study to be made on the movements of the empty stomach in any of the invertebrates