Female Kunming mice (6-8 weeks old) were exposed to total body irradiation by of 6?10 4V/m EMP(electromagnetic pulse, EMP) for five times in 6-8th day of gestation(post pregnant irradiation), or became pregnant within 14 days (early conception after irradiation), or 14-28 days (late conception after irradiation) after irradiation. Pregnant mice were killed at 18th day. Teratological markers were analysed to evaluate the effect of EMP irradiation on pregnancy and offspring. The results showed that EMP irradiation caused no significant changes in maternal body weight gains, most of organ weight and organ/body weight ratio. But it caused significant shortening of tail length of live foetus. The offspring sex ratio was decreased after post pregnant irradiation and early conception after irradiation. Body weight was decreased in the early and late conception after irradiation. EMP irradiation also resulted in a significant increase in fetal death rate and embryo absorption rate compared with control group, especially in the late conception group, which was increased 5 2 and 3 8 times respectively. The results suggested that EMP irradiation exerted certain effects on pregnancy and offspring development in both pre pregnant and post pregnant female mice.

Objective To determine the situation of contraceptive use and impact factors among reproductive-age women seeking abortion in Kunming which was in the southwest of China in order to provide information for improving contraceptive use. Methods A hospital-based study was conducted among 397 women of reproductive age, seeking abortion in hospitals of different levels in Kunming from June 2011 to December 2011. They were face to face interviewed by the trained investigators with the questionnaires. Results Among 397 women, 229 cases (57.7%) had experienced induced abortion. Abortion accounted for 61.7% of married women, and unmarried accounted for 39.3%. About 36.3%never used any contraceptives, and only 21.4%of respondents used contraceptives at every intercourse. The main contraceptive before this pregnancy was condom (68.9%) . The use of contraceptives was mainly decided by couple (73.4%) . Multivariate logistic regression analysis indicated that respondents' age, educational level and access to contraceptives in hospital were associated with the use of contraceptive. Conclusion Premarital pregnancy and low rate of contraception are the main reason for induced abortion. Fewer reproductive-age women seeking abortion use contraceptives. It is necessary to increase their awareness of contraception and abortion related knowledge, provide feasible contraceptive to enable women to avoid unwilling pregnancy. Further more, it is important to promote male involvement in contraception.

OBJECTIVETo confirm the genetic diagnosis of two patients with ring chromosome 22 syndrome and investigate the mechanism underlying the formation of r(22) and potential genetic causes for the clinical phenotypes.

METHODSCytogenetic and molecular analyses using standard G-banding, fluorescence in situ hybridization and single nucleotide polymorphism array (SNP array) were performed.

RESULTSFor case 1, the karyotype was 46,XY,r(22)(p11q13). SNP array has identified a 7.0 Mb heterozygous deletion at 22q13.2q13.33. For case 2, the karyotype was 46,XY,r(22)(p11q13)[84]/45,XY,-22[6]; SNP array has detected a heterozygous microdeletion of 1.6 Mb at 22q13.33.

CONCLUSIONWith combined application of genetic testing, 2 cases of r(22) syndrome were diagnosed, which has improved the understanding of the genotype-phenotype correlation of r(22).

Child, Preschool ; Chromosome Banding ; Chromosomes, Human, Pair 22 ; genetics ; Genetic Testing ; Humans ; Male ; Nerve Tissue Proteins ; genetics ; Oligonucleotide Array Sequence Analysis ; Polymorphism, Single Nucleotide ; Ring Chromosomes