Attractive males have faster sperm in three-spined sticklebacks Gasterosteus aculeatus

Recent studies have revealed that sexually selected traits may signal sperm quality and hence male fertilisation ability. There is also evidence that the expression of male sexual ornamentation and associated sperm characteristics depend on an indi- vidual＇s ability to cope with oxidative stress. Carotenoids are known for their antioxidant properties and carotenoid-based orna- ments might represent honest signals as these pigments can be traded offbetween the investment in sexual ornamentation, sperm function as well as immune response. In this study, we examined the relationship between sexual ornamentation （breeding colo- ration） and sperm characteristics （e.g., velocity and morphology） in the three-spined stickleback Gasterosteus aeuleatus, an ex- ternally fertilising fish species, in which sperm competition commonly occurs. During the breeding season males are sperm limi- ted and develop a conspicuous carotenoid-based coloration, which is under strong pre-copulatory sexual selection due to female mate choice and male-male competition. The results of the present study show that the expression of stickleback male breeding coloration is significantly positively associated with the linearity of sperm movement, whereas sperm morphology （head length to tail length ratio） is significantly negatively related to the trajectory of sperm movement. Moreover, there is some support for the phenotype-linked fertility hypothesis as the intensity of male red breeding coloration is significantly positively correlated with sperm velocity, which is supposed to be an important determinant of fertilisation success in external fertilisers, indicating the honesty of the sexually selected nuptial red coloration.     

Male size does not correlate with fertilization success in two bufonid toads that show size-assortative mating

We examined sexual size dimorphism （SSD）, mating pattem, fertilization efficiency and female reproductive traits in two bufonid toads （Bufo gargarizans and Duttaphrynus melanostictus） to test the idea that importance of male body size for egg fertilization success depends on the mating pattern. Female-biased SSD was evident only in D. melanostictus. Female B. gar- garizans laid fewer larger eggs nearly three months earlier than did female D. melanostictus. Fertilization efficieneies on average were higher in B. gargarizans （95%） than in D. melanostictus （91%）. Though differing in the degree of SSD, body size, breeding season, clutch size, egg size and fertilization efficiency, the two toads were similar in four aspects： （1） both showed size-assortative mating; （2） females did not tradeoff egg size against egg number; （3） male size, clutch size and clutch dry mass were greater in male-larger than in female-larger pairs after accounting for female snout-vent length （SVL）; and （4） the ratio of male to female SVL did not affect fertilization efficiency. Our data show that： （1） a female preference for large males is likely not important in terms of egg fertilization success; （2） a male preference for large females is likely important because larger females are more fecund; and （3） size-assortative mating arises from a male preference for large females. Our study demonstrates that male size is not always important for egg fertilization success in anurans that show size-assortative mating.     

2194例男性泌尿生殖道支原体检测及药敏分析

目的研究男性泌尿生殖系统炎症患者解脲脲原体(Uu)和人型支原体(Mh)感染及对抗菌药物耐药情况,以了解本地区男性支原体的感染流行状况并指导临床合理选择使用抗菌药物。方法采用支原体鉴定药敏试剂盒,对男性生殖道感染者进行支原体培养及药敏试验。结果 2 194份标本中检出支原体636例,阳性率为28.96%,其中解脲脲原体阳性率为22.59%,人型支原体阳性率为0.96%,解脲脲原体和人型支原体混合感染阳性率为5.42%。支原体对抗菌药物药敏结果显示,抗菌活性较高的是多西环素、普拉霉素、四环素和交沙霉素。结论Uu是男性泌尿生殖系统支原体感染的主要病原体。临床治疗支原体感染时应尽量根据药敏结果选择敏感药物。普拉霉素、多西环素、四环素和交沙霉素可作为本地区非淋菌尿道炎经验用药的首选药物,避免使用喹诺酮类药物。     

男性危机？！

10月28日是一个属于男人、但是很多男人都不知道的节日——男性健康日，我们在《关注》栏目里策划了一组有关男性生殖健康的文章，希望男人看到以后更关心自己，女人看过之后更关心自己所爱的男人。     

Effect of losing a fight on later agonistic behavior toward unfamiliar conspecifics in male Syrian hamsters

In many species,agonistic interactions result in social relationships that are stable over time.In Syrian hamsters,two unfamiliar males that are placed together...     

男性人乳头瘤病毒感染研究进展*

人乳头瘤病毒(human papillomavirus,HPV)感染是全球最常见的性传播性疾病(STD)之一,与生殖系统肿瘤和生殖器疣密切相关。HPV感染与女性生殖健康之间的病因学关系已经有了较多的研究,近年来越来越多的学者开始关注男性HPV感染。本文就男性HPV感染与男性生殖健康的研究进展进行综述。     

科研快讯

《PLoS综合》:视黄醇类物质转运蛋白结合机制差异研究获进展近日,中科院昆明动物研究所黄京飞课题组张玉茹博士和赵玉琦博士运用生物信息学和分子动力学模拟的方法,详尽解释了这种生     

华南地区汉族成年男性肢带骨与身高关系的探讨

为了评价肢带骨推算身高的实用意义,我们测量了近年收集华南地区汉族成年男性、已知生前身高的50具骨骼的肢带骨。测量方法依吴汝康和吴新智的《人体骨骼测量方法》所定的标准。用测骨盘测量锁骨最大长、髋骨最大长,直脚规测量肩胛骨形态宽。应用相关与回归的计算方法,计算各肢带骨左、右侧及其左、右两侧平均值与身高的相关系数、回归系数,并建立了推算身高的回归方法。     

单一的声调有人爱

那些没有一副好嗓音的男性无需再发愁了，美国的一项研究表明，男性声音频率变化越小，越容易获得异性的青睐。这意味着不温不火的声音更具异性缘，个中翘楚当属好莱坞的当红影星乔治·克鲁尼。研究者称，不是声音本身的作用，而是其间蕴含的力量具有吸引力，单调的声音是力量、独立与主宰的象征。     

支原体与非淋菌性尿道炎(粘液性宫颈炎)的相关性研究

目的　探讨解脲脲原体、人型支原体与非淋菌性尿道炎( NGU)、粘液性宫颈炎( MPC)的相关性。方法　采用涂片法检测阴道毛滴虫、念珠菌和细菌性阴道病,EL ISA法测定衣原体和培养法分离淋球菌和支原体。结果　广东省皮肤性病防治中心性病门诊30 0例患者中,诊断为男性NGU34例和女性MPC83例。解脲脲原体总的检出率为30 % ( 90 / 30 0 )。女性总检出率为4 7.6 % ( 4 9/ 10 3) ,其中MPC组检出率为70 % ( 14 / 2 0 ) ,非MPC组为5 3% ( 4 4/ 83) ,两者比较差异无显著性( χ2 =1.4 8,P>0 .0 5 )。男性总检出率为16 .2 % ( 32 / 197) ,其中NGU组为35 .3% ( 12 / 34) ,非NGU为12 .3% ( 2 0 / 16 3) ,两者比较差异有显著性( χ2 =5 .5 6 ,P<0 .0 5 )。人型支原体仅在非NGU(粘液性宫颈炎)中检出9例( 3.0 % )。结论　解脲脲原体与男性NGU相关,而与女性MPC无相关性;人型支原体与NGU无相关性。临床实验室检出支原体时应慎重解释结果