羽毛球单打过程中的接杀球训练方法的分析及研究

羽毛球在高校中是一项深受师生们喜爱的运动项目,是全面锻炼身体、增强身体机能的良好手段。强有力的杀球无疑是得分最好的手段,但大家却往往忽视了自身防守的短板。本文运用了实验法将具有一定羽毛球运动基础的大学生分为两组进行不同的接杀球技术的训练。通过一个月的训练,学生拥有了良好的接杀球防守技术,能够经常性地获得比赛胜利。

中外优秀羽毛球混合双打女运动员接杀效果研究

运用文献资料法、录像观察法、数理统计法、对比分析法,以 2015 年到 2021 年羽毛球苏迪曼杯、世界羽联系列赛等比赛,进入混双项目半决赛和决赛阶段的 40 场比赛录像为观察对象,探究中外国混合双打女运动员接杀技术和效果。结果显示:1. 在左区接男运动员或女运动员杀球时,中国女运动员接杀效果优于外国女运动员。2. 在中区接男运动员杀球时,中国女运动员接杀效果优于外国女运动员。接女运动员杀球时,外国女运动员得失分效果占优,中国女运动员优劣势效果占优。3. 在右区接男运动员杀球时,中国女运动员得失分效果占优,外国女运动员优劣势效果占优。接女运动员杀球时,中国女运动员接杀效果优于外国女运动员。

世界优秀羽毛球混合双打运动员接杀效果研究

本研究运用文献资料法、录像观察法、数理统计法,以2013—2018年羽毛球苏迪曼杯、世界羽联系列赛等比赛,进入混合双打项目半决赛和决赛阶段的40场比赛录像为观察对象,探究羽毛球混合双打运动员接杀技术及其效果。结果显示:混合双打男运动员和女运动员接杀技术使用率依次是挡网比例最高、抽球比例其次、挑球比例最低。男运动员接杀抽挑效果较好,挡网效果一般;女运动员接杀抽挡效果较好,挑球效果一般。建议:男运动员降低挡网使用率的同时提高抽挑使用率;女运动员可降低挡网使用率提高抽球使用率。

人类圣骑士预备役

在决定用人粪骑士之前先要做好思想准备．因为报据韩服的经验。在下一次改版前人类骑士可以说是单练速度慢、打钱速度极慢、PK任人宰割的废柴。改版后．怪物能力、速度加强．骑士防御高的好处才得以体现。新开的龙谷密穴如果澄有防高的骑士顶．打起来是非常辛苦的。虽然在PK方面还不够强．但以后骑士系列还会加强．值得期待。所以．准备练个骑士为将来作准备的朋友一定要有无比的恒心和毅力才行。

Influence of Connexin43 on the Bystander Effect Induced by Double Suicide Genes System in Vitro and in Vivo

Objective： To observe the influence of connexin 43 （Cx43） on the bystander effect induced by cytosine deaminase （CD） and herpes simplex virus thymidine kinase （HSV-tk） coexpression suicide genes system in human cholangiocarcinoma QBC939 cells and transplantation tumors in nude mice. Methods： In vitro, the CD＋tk＋ and CD＋tk＋Cx＋ cells were respectively treated with 5-fluorocytosine （5-Fc） and Ganciclovir （GCV）. The cytotoxic effect was evaluated by MTT method. In order to investigate the influence of Cx43 on the bystander effect, the size of transplantation tumors of the CD＋tk＋ and CD＋tk＋Cx＋ cells was measured before and after application of 5-Fc and GCV. Results： CD and tk genes were stably expressed in transfected QBC939 cells. The increased expression of Cx43 was determined by testing for the presence of Cx43 mRNA by RT-PCR and the presence of Cx43 protein by Western Blot in CD＋tk＋Cx＋ cells. The killing effect of 5-Fc and GCV on CD＋tk＋Cx＋ cells was more effective than that on CD＋tk＋ cells both in vitro and in vivo. Conclusion： Double suicide genes system CD/5-Fc＋tk/GCV could induce remarkable killing effect on cholangiocarcinoma cells in vitro and transplantation tumors in vivo. The cotransfection of Cx43 gene could enhance the bystander effect and hence the inhibition of carcinoma cells.

Pre-seed Treatment Effects on Avocado （Persea americana L.） Seedlings Health and Growth before Side-Grafting in Ghana

Studies were conducted to detennine the effects of hot water （50 ℃） and fungicide （contizeb ‘5＇） treatments on avocado seeds in terms of seed health, germination and seedling growth before side-grafting. The leathery coverings or seed coat were removed and either 1 cm or 1.5 cm of the narrow top of the seeds was removed before sowing. There were six treatments arranged in a randomized complete block and rephcated three times. In a six week period after germination when side grafting could be done, it was found out that the earliest germination came from the ＇no hot water or fungicide-treated＂ seeds cut at 1 cm but most seeds germinated from the fungicide-treated seeds at 1 cm cut. Most fungi including Fusarium andAspergillus spp found to either delay germination or reduce seedling vigour were minimized in number through the fungicide treatment compared to the hot water-treated seeds. Seedlings performance in terms of shoot extension and canopy development was significantly better in the fungicide-treated seeds than from either the hot water or the non-treated seeds. The study concluded that avocado seed treatment prior to sowing enhanced germination.

Analysis of Carbamates Pesticides： Immunogical Technique by Local Development of Enzyme-linked Immuno-Sorbent Assay

Carbamates insecticides are used increasingly in organochlorine insecticides for the control of insect pests. It agriculture as a replacement for environmentally more persistent was the most used pesticides in Loukkous-Morocco. Conventional methods employed to detect/analyze carbamates residues are time consuming and require sophisticated equipment only available in well-equipped laboratories. In addition, the conventional methods usually require a lot of complex pre-treatment of samples. Therefore, convenient and rapid pesticide detection system is urgently needed. In this order, we aimed to develop a rapid ELISA （enzyme-linked immuno-Sorbent Assay） for detection of some carbamates such as carbendazim [methyl 2-benzimidazole carbamate] and carbofuran [2,3-dihydro-2,2-dimethyl-7-benzofuranylmethyl carbamate]. To develop an immunoassay for carbendazim and carbofuran we have synthesized molecules with acid function （haptens with 4 and 5 carbons） that are coupled with BSA protein and injected to the rabbits, collected antibodies are used for the achievements of the immunoanalytical assay.

Design, synthesis, insecticidal evaluation and molecular docking studies of cis-nitenpyram analogues bearing diglycine esters

Based on the strategies of receptor structure-guided neonicotinoid design, a series of novel cis-nitenpyram analogues bearing diglycine esters were designed and synthesized. Preliminary bioassays indicated that the insecticidal spectra of the target compounds were expanded compared with our previous work, while all the target compounds presented excellent insecticidal activities against Nilaparvata lugens and Aphis medicagini at 100 mg/L. Among these analogues, 6b showed 100% mortality against Nilaparvata lugens (LC 50 = 0.163 mg/L) and 90% against Aphis medicagini at 4 mg/L. SARs suggested that the insecticidal potency of our designed cis-nitenpyram analogues was dual-controlled by the size and species of the ester groups. The molecular docking simulations revealed that the structural uniqueness of these analogues may lead to a unique molecular recognition and binding mode compared with the previously designed compounds. Introduction of the peptide bond gave rise to more significant hydrogen bonds between the nitenpyram analogues bonding with the amino acid residues of insect nAChRs. The docking results explained the SARs observed in vitro, and shed light on the novel insecticidal mechanism of these cis-nitenpyram analogues.