Postnatal development of the testes of rats exposed to the auxin [plant growth promoting] 2,4-dichlorophenoxy acetic acid

2, 4-dichlorophenoxy acetic acid [2, 4-D] is one of the active synthetic auxins that are widely used to control plant growth. The toxic effect of this plant growth regulator on the development of the testes of rats was investigated in this study on the histological basis. Fifty adult mated female albino rats were used in this study. Twenty animals served as controls and thirty received a daily oral dose of 15 mg/kg of 2, 4-D starting from the sixth day of pregnancy till four weeks after delivery. Specimens were taken from the offsprings of animals at one day, one week, two weeks and four weeks postnatal and examined using light and electron microscopy. Abundant interstitial connective tissue was observed in the testes of one day rats. With progress of development, there was loss of organization of the lining epithelium of the seminiferous tubules with gradual appearance of signs of degeneration and desquamation of the spermatogenic cells to the lumen of the seminiferous tubules. The effect of 2, 4-D on mammalian reproduction could be through estrogen hormone agonistic action which impaired the pituitary testicular axis by inhibiting the neonatal gonadotrophin secretion. The deleterious effect of this synthetic growth promoting hormone on the testes of the new generation must be kept in consideration during its use as plant growth promoting hormone and care must be taken about the food supply exposed to this synthetic hormone

Anthropometric study on the human permanent mandibular canine tooth

A morphometric study on the human mandibular canine was carried out for establishing the sexual dimorphism in the various parameters of the mandibular canine tooth and for determination of the sex identify utilizing these mandibular canine parameters. The study included 320 adult individuals from Assiut medical students belonging to both sexes, their ages ranged between 19 and 23 years and had fully erupted healthy and non worn mandibular permanent canines. The mesiodistal mandibular crown width as well as the mandibular canine arch width was measured and the data collected was computerized and analyzed statistically. The results showed that the mean value of the mandibular mesiodistal crown width was 6.938 mm [ +/- 0.608] in male subjects and 5.952 mm [0.640] in females with sexual difference 0.986 mm and the percentage dimorphism was 6.56. The sexual dimorphism in the mandibular canine crown width was found to be significant. Also, the mandibular canine arch width exhibited such sexual dimorphism with a mean value 29.707 mm [ +/- 1.973] in males and 29.471 mm [ +/- 1.837] in females. The sex difference in the mandibular canine arch width was found to be significant. Higher correlations were found in both sexes between mandibular canine separation width and mandibular canine crown width. The mean value of the calculated mandibular canine index [MCI] was found to be 0.233% [ +/- 0.0179] in males and 0.2021 [ +/- 0.0117] in females and the sexual difference in the MCI was found to be significant. The standard MCI was calculated and was found to be 0.2148. Sex identity was determined using this standard MCI with an accuracy 86.88% in females

study on the correlation between the stride length and body height

This study was carried out in an attempt to establish the correlation between the stride length and body height and to find out a simple technique for estimation of the body stature from the stride length of an individual in a normal walk. Such procedure could help physically anthropologists to enable estimation of the suspected body height of unknown individual through measuring the stride length from the foot prints that were found almost at every crime scene. The study included 144 adult male and 48 female individuals from Assiut medical students, their ages ranged between 19 and 21 years. Stature and stride length with and without shoes of each individual were measured and data were statistically analyzed. The results showed that there was no significant differences between right and left stride length. The results revealed also the presence of significant difference between foot stride length and shoe stride length. The study proved also a positive linear correlation between stature and stride length. The multiplication factors, conventional and revised were also derived to calculate the estimated stature from the measured stride length