Effect of Letrozole Administration as a Selective Aromatase Inhibitor on Male Rat's Reproductive Performance.

This study was designed to investigate the effect of administrating a selective aromatase inhibitor, letrozole, on the parameters of the rat's sperm and testicular histomorphology. A total of 40 male Wistar rats with an age of about 5 months old and an average weight of 190±10 g were divided randomly into 4 groups (n=10 each) and treated for 6 weeks. The first group (C) was given normal saline only as a control group. The second (T1), third (T2), and fourth (T3) groups received doses of 0.5, 1, and 1.5 mg/animal letrozole, respectively. At the end of the experiment (42 days), all animals were euthanized and the samples were obtained for more evolutions. The results of this study showed a significant increase in sperms quality (P-value≤0.05) while indicating a significant decrease in sperm abnormality in the T1 group, compared to the C group. Moreover, there was a significant difference represented by an increase in sperm quality, and a significant difference represented by a decrease in sperms abnormality in the T2 group, compared to the C group. On the other hand, there was a significant difference represented by an increase in sperm quality, and a significant difference represented by a decrease in sperm abnormality in the T3 group, compared to the T2 group. Normal somniferous tubules with high spermatoscopy counts were shown in histologic sections in the control group, primary and secondary spermatocytes with spermatozoa. In the T1 group, there was adequate spermatogenesis with a thick basement membrane. In the T2 group, there was normal testicular tissue with a significant increase in spermatogenic activity and number. In the T3 group, there was no significant atrophy or other pathology. The results of the current study suggested that letrozole improved spermatogenesis while causing no visible pathological alterations in testis tissue.

Mathematics anxiety among eighth-grade students of the United Arab Emirates.

To investigate the mathematics anxiety of 159 students in Grade 8 (M age = 14.3 yr.) in the United Arab Emirates a 28-item anxiety scale was administered. Analysis indicated some mathematics anxiety. Also, boys and girls scored significantly differently as boys had the higher mean.

Preference for numerical information among Arab students.

To investigate the preferences for numerical information of 157 tenth grade students (M = 16.1 yr.) in the United Arab Emirates, an Arabic translation of a questionnaire of Viswanathan developed, validated, and moderately stable over time was administered. Analysis indicated the preferences of Arab students for numerical information was positive. Also, these Arab students scored higher than American students in contrast with those in the Viswanathan study but the difference was not statistically significant using an independent t test.

Differences in spatial visualization as a function of scores on hemisphericity of mathematics teachers.

59 teachers of mathematics were administered the Your Style of Learning and Thinking-Form A and categorized as showing Left (n = 13), Right (n = 12), or Integrated (n = 15) hemisphericity. Rotations scores on the Purdue Spatial Visualization Test were not statistically significant among the three groups.

Reliability and factorial structure of an Arabic translation of the Self-Consciousness Scale.

An Arabic translation of Fenigstein, Scheier, and Buss's 1975 Self-consciousness scale was administered to 254 United Arab Emirates University undergraduate students, 99 men and 155 women with a mean age of 24 years. A factor analysis of the intercorrelations indicated the same general factors as in the original and other replicating studies. This study, however, differed from them in item loadings and distribution of items within the three factors of the scale. Other factor solutions were also tried and reported. Differences between men and women were also noted. In contrast with previous studies, the Arabic version showed differences in the magnitude of correlations among subscales. These differences were discussed in the light of cross-cultural and Arabic studies showing the influence of culture.