Severe iron deficiency is associated with a reduced conception rate in female rats.

BACKGROUND/AIMS: Iron deficiency is a global nutritional disorder, especially for pregnant women. There is a close relationship between deficiency in trace elements and unexplained infertility in females. However, the relationship between iron deficiency and unexplained infertility has not been determined. This study was designed to determine the effect of iron deficiency on conception in a rat model. METHODS: Female rats were randomly divided into two groups (n = 15 each): an iron-deficiency group fed a low iron diet and a normal control group. Both groups of female rats were mated with healthy male rats after the iron-deficiency model was established. RESULTS: Iron-deficient rats developed white skin and eyes, hair loss, and weight loss. Hemoglobin levels and red blood cell count were significantly lower than in controls, showing successful establishment of the iron-deficiency model. There was a significantly lower conception rate in the iron-deficiency group; there also appeared to be a disruption of estrus and a delay in conception in the iron-deficiency group. CONCLUSIONS: Severe iron deficiency has a significant influence on fertility, and may be an important factor in unexplained infertility. Further research on the role of iron in conception is warranted.

[Diversity and community structure of soil ammonia-oxidizing bacteria in Hulunbeier Grassland, Inner Mongolia].

By the methods of polymerase chain reaction-denaturing gradient gel electrophoresis and sequence analysis, a comparative study was conducted on the diversity and community structure of soil ammonia-oxidizing bacteria in the Filifolium sibiricum steppe, Stipa baicalensis steppe, Leymus chinensis steppe, Stipa grandis steppe, and Stipa kryrowi steppe in Hulunbeier Grassland, Inner Mongolia. A significant difference was observed in the community structure of soil ammonia-oxidizing bacteria among the five steppes, with the similarity lower than 50%. The diversity of soil ammonia-oxidizing bacteria was the highest in F. sibiricum steppe, followed by in S. baicalensis steppe, L. chinensis steppe, S. kryrowi steppe, and S. grandis steppe. In the five steppes, Nitrosospira cluster 3 was the dominant group, and the Nitrosospira cluster 1, 2, and 4 as well as Nitrosomonas were also found. The community structure of soil ammonia oxidizing bacteria in F. sibiricum steppe was most complex, while that in L. chinensis steppe and S. grandis steppe was relatively simple. Correlation analysis indicated that there existed significant positive correlations between the diversity of soil ammonia-oxidizing bacteria and the soil moisture, total nitrogen, total organic carbon, and C/N ratio (P<0.05).