Different sperm sources and parameters can influence intracytoplasmic sperm injection outcomes before embryo implantation

To evaluate the effects of sperm with different parameters and sources on the outcomes of intracytoplasmic sperm injection (ICSI), 1972 ICSI cycles were analyzed retrospectively. Groups 1 to 5 were composed of cycles using ejaculated sperm and were grouped according to sperm quantity, quality, and morphology into normal (288 cycles), or mild (329 cycles), moderate (522 cycles), severe (332 cycles), and extremely severe (171 cycles) oligozoospermia and/or asthenozoospermia and/or teratozoospermia (OAT) groups. Group 6 was composed of 250 cycles using testicular or epididymal sperm, and Group 7 consisted of 80 cycles using frozen-thawed sperm. We found that fertilization rates were gradually reduced from Groups 1 to 6, and reached statistical difference in Groups 5 and 6 (P<0.05). The high-quality embryo rate was higher in Group 1 than in Groups 2, 3, 5, 6, and 7 (P<0.05). No statistical differences were observed in the rates of embryo cleavage, clinical pregnancy, miscarriage, live-birth, premature birth, low birth weight, weeks of premature birth, average birth weight, or sex ratio for all seven groups (P>0.05). A total of nine cases of malformation were observed, with a malformation rate of 1.25% (9/719). In conclusion, different sperm sources and parameters can affect ICSI outcomes before embryo implantation. A full assessment of offspring malformation will require further study using a larger sample size.     

试论高师数学教育研究的原则与选题

提出高师数学教育研究的３条原则与７个方面的选题．     

Analysis of a new 5-phase bearingless induction motor

This paper addresses the bearingless motor with a single set of multiphase windings. The interaction between M and M±1 pole-pair magnetic fields produces radial force. Based on this principle,a bearingless machine is obtained. Conventional bearingless machine has dual windings,levitation windings and torque windings,which produce the two magnetic fields. In the proposed bearingless motor,the two needed magnetic fields are produced by feeding two groups of currents to a single set of multiphase windings. Taking a 5-phase induction motor as example,the inductance matrices,considering air gap eccentricity,are calculated with the modified winding function method. The radial force analytical model is deduced by virtual displacement,and its results are validated by FEA. The mathematical model of the new bearingless machine is set up,and the simulation results verified the feasibility of this novel bearingless motor.     

Accuracy of a combined score of zygote and embryo morphology for selecting the best embryos for IVF

Objective:To evaluate the accuracy of a scoring system combining zygote and embryo morphology in predicting the outcome of in vitro fertilization(IVF)treatment.Methods:In a study group,117 consecutive IVF or intracytoplasmic sperm injection(ICSI) cycles with embryo transfer were carried out and 312 embryos were scored Using a combmed scoring system(CSS)of zygote and embryo morphology before transplantation.In a control group,a total of 420 IVF or ICSI cycles were carried out and 1176 embryos were scored using a cumulative embryo score(CES).The effects of the combined scoring system on the embryo implantation rate and pregnancy rate per cycle were analyzed.Results:Using the combined scoring system,the embryo implantation rate(27.6%)and the clinical pregnancy rate(48.7%)were significantly higher than those in the control group(20.8%and 38.6%,respectively).Also,the implantation rate of embryos scoring≥70 (38.5%:82 sacs/213 embryos)was significantly higher (P＜0.001)than that of embryos scoring＜70(4%:4 sacs/99 embryos).The pregnancy rate of patients with embryos scoring≥70 using the combined scoring system(66.7%)Was significantly higher(P＜0.001)than that of patients with embryos scoring≥20 using the cumulative embryo score(59.0%).Conclusion:The results suggest that selecting embryos with a high Score(≥70)using the combined scoring system could inerease the implantation rate and pregnancy rate,and that using a scoring system combining assessments of human zygotes and pre-implantation embryos might predict IVF outcomes more accurately than using a cumulafive embryo score.     

Anaerobic ammonium oxidation for treatment of ammonium-rich wastewaters

The concept of anaerobic ammonium oxidation (ANAMMOX) is presently of great interest. The functional bacteria belonging to the Planctomycete phylum and their metabolism are investigated by microbiologists. Meanwhile, the ANAMMOX is equally valuable in treatment of ammonium-rich wastewaters. Related processes including partial nitritation-ANAMMOX and completely autotrophic nitrogen removal over nitrite (CANON) have been developed, and lab-scale experiments proved that both processes were quite feasible in engineering with appropriate control. Successful full-scale practice in the Netherlands will accelerate application of the process in future. This review introduces the microbiology and more focuses on application of the ANAMMOX process. Project supported by the National Hi-Tech Research and Development Program (863) of China (No. 2006AA06Z332), and the Science and Technology Foundation for Key Project of Zhejiang Province (No. 2003C13005), China     

The Art of Paper Cutting：Living Fossils of Chinese Civilization

Paper cut is one of the most distinctive folk arts that Chinese women have created and developed over the sweep of Chinese history. The art of paper cutting, originating from the pre-history era and dubbed as ＂living fossils of Chinese civilization＂, has been carried forward for hundreds of years in the vast countryside of China and survived with great vitality until today.     

基于WEB的高校教师评价系统的设计与实现

高校教师评价是保证教学质量、教师专业发展和实现高校办学目标的重要环节,本文介绍了一种ASP．NET＋SQLSERVER2000技术来设计并实现高校教评价系统的方法。     

开发小学学龄儿童运动和智力潜能的实验研究

采用实验对比等研究方法，探讨开发小学学龄儿童运动和智力潜能的方法。实验结果显示．通过强化学龄儿童左侧肢体的运动训练，能有效提高其左侧、双侧甚至右侧肢体的运动技能；对提高儿童的反应能力和文化课学习成绩，也有明显的促进作用。     

Identification of Rhodiola species by using RP-HPLC

INTRODUCTION The roots of Rhodiola species, one of the im-portant traditional Chinese herbal medicines, have anti-viral (Sun et al., 1993), anti-tumor (Wang et al., 1992), anti-ageing (Yi et al., 1992), anti-oxygen de-ficiency, anti-radiation (Luo et al., 1996) effects and other pharmacological properties (Xu et al., 2000). Ten Rhodiola species distribute in the Tianshan Mountains areas of China. Biologically active com-pounds content in the roots has large variation and the value of…