Prenatal benzodiazepine effects in mice: postnatal behavioral development, response to drug challenges, and adult discrimination learning

Oxazepam treatment of primiparous mouse dams on days 12-16 of pregnancy (15 mg/kg p.o. twice daily) produced a transient retardation of postnatal body growth and neurobehavioral development, a reduction of the hyperactivity response to amphetamine in open-field tests on postnatal days 14-16, and a selective impairment of adult active avoidance in four go-no go discrimination tasks. Equally important for understanding the nature of the prenatal benzodiazepine syndrome were several negative results, namely, the absence of changes in homing performance on postnatal day 10, an intact hyperactivity response to scopolamine on postnatal days 21-23, a lack of effects on adult activity, and a normal passive avoidance performance in the go-no go tasks. A modification in monoaminergic regulatory functions may account for the overall profile of prenatal drug effects. Based on the results of this experiment, of a preliminary multidose study (0-50 mg/kg), and of an additional cross-fostering experiment, several methodological issues are addressed. These include the choice of appropriate treatment schedules and of testing procedures adequate for each developmental stage, and the control for various confounding variables such as litter effects, postnatal maternal influences, and developmental history.     

Study on extensive lymph node dissection: metastatic lymph nodes in papillary carcinoma of the thyroid

Bilateral cervical lymph node dissection was performed in 71 cases of papillary thyroid carcinoma, considered to be relatively early cases because of mobility, irrespective of the size of tumor or presence of node enlargement. Of these, 33 cases received additional node dissection of the anterosuperior mediastinum through longitudinal sternotomy. The number of lymph nodes examined per subject averaged 89.9, the number of metastatic nodes was 13.8, and metastasis was noted in 88.7% of all cases. Lymph node metastasis tended to be more frequent on the affected side, but was simultaneously scattered over the whole cervical area. As to sites, metastasis of paratracheal nodes on the affected side occurred at a frequency of 66.2%, inferior and superior jugular nodes at 62.0% and 59.0% respectively, pretracheal nodes at 50.7%, and tracheoesophageal nodes at 47.9%. The high incidence of para- and pretracheal nodes suggests that the lymph flow in this direction is of great importance in metastasis. In fact, lymph nodes in the mediastinum, which were directly continuous with these nodes, showed as high as 39.4% metastasis in cases of anterosuperior mediastinal extirpation. This extensive node dissection is considered to be very preferable as at least the agony of survival with carcinoma can be lessened.     

Quantity of Eimeria spp. oocyst elimination in sheep

In the present paper, the results obtained are shown after a study by means of multivariant statistical analysis, of the quantity of Eimeria spp. oocyst elimination in sheep, bearing in mind the variations observed in the different areas, in the different age-groups, from month to month, and from year to year. Climatic factors, development of immunity, lambing seasons, and poor hygienic conditions seem to be the factors responsible for the statistically significant differences found when analysing the aforementioned main effects.