Acupuncture has been reported as an effective treatment for some addictions. The purpose of this study was to evaluate acupuncture treatment effect on the cigarette smoking habit with a motivated population in a controlled clinical setting. From a volunteer research population, sixteen matched pairs were assembled according to age, sex, and severity of smoking habit. Research subjects were randomly assigned to real or sham acupuncture treatment groups. Self-reported cigarette logs were measured pre-treatment and post-treatment. Analysis of variants confirmed homogeneity of group pre-treatment cigarette consumption. Cigarette consumption significantly decreased in both th e real and sham treatment groups. Treatment group, age, sex, or severity of smoking habit were not significant factors in treatment effects for cessation of smoking. Legitimate crossover treatment for sham research group showed a significant decrease (p less than or equal to 0.05) in cigarette consumption; this change was not statistically different from change in cigarette consumption during placebo treatment. A discussion of acupuncture point selection rationale is made as is an analysis of Tehchi sensations and subjective reports of appetite for cigarettes. Acupuncture did not enhance the cessation of cigarette smoking in this study.

Using scanning electron microscopy, the degradation characteristics of two absorbable ligating clips, Absolok (polydioxanone) and Lactomer (poly-L-lactide-co-30%-glycolide) have been studied under in vivo and in vitro conditions. The rate of Absolok clip degradation was significantly greater than that of Lactomer clip degradation both in vitro and in vivo. The rate of degradation of Lactomer clips significantly increased and they showed a greater change in proportion of breakdown in vivo than in vitro compared to Absolok clips. The Absolok clip breakdown began with the formation of surface undulations which later developed into fissures. The undulations appeared on the clip surface as early as 7 days and by 2 weeks developed into fissures. The initial appearance of the fissures was at the edge of the clips particularly at the mating surface. The thickness of layers forming the fissures gradually decreased and by 15 weeks the layers appeared as very thin sheets of materials. The high energy areas (locking and molding points) were more resistant to breakdown and the remains of the clips were still present 25 weeks after initiation of the experiments. The Lactomer clips showed very little sign of degradation in vitro even after 10 weeks of incubation. However, in the in vivo experiments undulations formed on the clip surface as early as 2 weeks postimplantation. These clips also showed fissures similar to those observed on Absolok clips.

The locking mechanism strengths of the absorbable Absolok and Lactomer ligating clips and the absorbable Lactomer staple have been determined following implantation in an animal model. Three sizes of each type of clip and the single size of staple were enclosed in open mesh nylon pouches and implanted subcutaneously in rabbits for periods of 4, 7, 14, 21, and 28 days before tensile testing of the lock mechanisms. No change in the lock mechanism strength was detected for the Absolok clips before 21 days. The Lactomer clips and staples, however, showed significant decrease in lock mechanism strength within 7 days of implantation, this loss increasing with longer implantation times. A proportion of all the devices were found to have dissolved to an extent that precluded testing at 21 and 28 days. The findings indicate that the lock mechanisms of absorbable ligating clips differ significantly in their short-term (30 days) durability.

No abstract

An "allowable interval" for responding has been arbitrarily used In mimal reaction time studies, having no empirical basis in systematic invesr~gnt~ons of an animal's optimal response capability. The results of this research, In which negative reinforcement (low amperage shock) was used, indicate that the reaction time of the pre-adolescent chimpanzee in an experimental situation approximating that of routine laboratory performance testing is highly similar to that of man. In programming tasks, which involve single or multiple stimuli to which a discrete response must be made, suggestions are made concerning the allowable time interval for responding.Since the turn of the century, ilnprovements in apparatus for measuring reaction time have been marked. This has permitted many and diverse reaction time studies by numerous investigators. Some of the more sophisticated human reaction time snldies in recent years have been those of Brainard, et al.