The present work was designed to investigate the characteristic features of histological changes that occurred in juxtaglomerular apparatus development of local domestic Iraqi sheep embryo and lambs Awasi sheep (Ovis aris) at different during gestation stages until birth. To conduct this goal, firstly the prenatal specimens from sheep embryo collected from 12 female's pregnant ewe at three different ages of 40 and 120 days prenatal and 30 day postnatal (four fetuses, lamb for each group), then used Routine histological stain haematoxyline and Eosin stain (H&E). Result show the juxtaglomerular apparatus development in the current study appeared in the Microscopic examination of kidney samples at 40 day age the juxtaglomerular apparatus was not developed in first trimesters of gestation in renal corpuscles and the embryo at 120 day age show The juxtaglomerular apparatus evolution became clear and relatively complete that consists of macula densa cells as row of cell in position in distal tubules and juxtaglomerular cells become clear and large nuclei and the lacis cell (mesangial cells) become more prominent in renal corpuscle that formed firstly histological. While the juxtaglomerular apparatus at 30 days postnatal of sheep it Very clear histological differentiation with higher cells that content elongated nuclei of macula densa cells, The presence of more mature juxtaglomerular cells near the entrance of the glomerulus was noted.

The objective of this study was to measure the concentration of total chlorophyll and its protein content by exposing aquatic plants Lemina minor to varying concentrations of heavy elements [10, 20, and 30 mg/L] for a month in order to evaluate the effects of these salt concentrations on the physiological conditions of the plants. The results of the investigation showed that the concentrations of the components in the water plants used for the analysis rose toward the end of the study in a different manner than in the control sample. The response of water plants exposed to heavy metals was examined in terms of their protein and chlorophyll contents.