Results 41 to 50 of about 651,503 (286)

Hydrodynamic propulsion of human sperm [PDF]

, 2009
The detailed fluid mechanics of sperm propulsion are fundamental to our understanding of reproduction. In this paper, we aim to model a human sperm swimming in a microscope slide chamber.
Green, Richard B., Cannon, R.M., Pacey, A.A., Gillies, E.A., Gillies, Eric A., Green, R.B., Pacey, Allan A.; id_orcid, Cannon, Richard M.   +7 more
core   +1 more source

Identifying windows of susceptibility to essential elements for semen quality among 1428 healthy men screened as potential sperm donors

Environment International, 2021
Background: Essential elements such as iron (Fe), cobalt (Co), copper (Cu), zinc (Zn), selenium (Se), rubidium (Rb), strontium (Sr), and molybdenum (Mo) are necessary for reproductive health.
Heng-Gui Chen, Qi Lu, Zhou-Zheng Tu, Ying-Jun Chen, Bin Sun, Jian Hou, Cheng-Liang Xiong, Yi-Xin Wang, Tian-Qing Meng, An Pan   +9 more
doaj   +1 more source

Sperm Counts Are Falling Worldwide

, 2021
Claims that sperm counts have fallen worldwide are based on meta-analysis of sperm concentration data taken from a variety of published studies that were never designed to answer this question. Since methods of counting sperm in the laboratory over time have changed so markedly, both in terms of the techniques used and in terms of the staff training ...
openaire   +2 more sources

Post-Meiotic Intra-Testicular Sperm Senescence in a Wild Vertebrate [PDF]

, 2012
There is growing interest in sperm senescence, both in its underlying mechanisms and evolutionary consequences, because it can impact the evolution of numerous life history traits. Previous studies have documented various types of sperm senescence, but
Richard H. Wagner, Penn, Dustin J., Richard H Wagner, Hoi Herbert, Wagner, Richard H., Hettyey Attila, Hoi, Herbert, Attila Hettyey, Dustin J. Penn, Balázs Vági, Herbert Hoi, Vági Balázs, Wagner Richard H., Penn Dustin J., Hettyey, Attila, Vági, Balázs, Dustin J Penn   +16 more
core   +2 more sources

Microneedles Mediated Delivery of Nanodiamonds for Quantum Sensing of Free Radicals in Skin Tissue

Advanced Materials Technologies, EarlyView.
Fluorescent nanodiamonds are nanoscale sensors capable of monitoring cellular stress responses. However, to function effectively, they must be delivered into cells or tissues. Here, we demonstrate their application in the skin by developing a dissolvable microneedle platform that dissolves after skin insertion, enabling the delivery of nanodiamonds ...
Siyu Fan, Maria Carmona Lobita, Thea Vedelaar, Yue Zhang, Claudia Reyes‐San‐Martin, Tomás Bauleth‐Ramos, Gésinda Geertsema‐Doornbusch, Han Gao, Mohammad‐Ali Shahbazi, Hélder A. Santos, Romana Schirhagl   +10 more
wiley   +1 more source

Nonreciprocal Swarmalators With Reconfigurable and Controllable Formations for Robot Collectives

Advanced Robotics Research, EarlyView.
Nonreciprocal swarmalator interactions are enabled through control barrier functions to transform self‐organizing robot collectives into reconfigurable, constraint‐aware systems. Complex two‐ and three‐dimensional shapes, continuous morphing, obstacle‐aware navigation, collective splitting, and object transport emerge from modulating agent‐level ...
Kush Patel, Xinyue Xu, Wei Xiao, Steven Ceron   +3 more
wiley   +1 more source

The KIF6‐RBP Complex Orchestrates mRNA Transport Required for Sperm Flagellar Assembly

Advanced Science, EarlyView.
Two homozygous deleterious KIF6 variants are identified in unrelated men with impaired sperm motility. Mouse models and multi‐omics analyses reveal that KIF6 cooperates with the RNA‐binding proteins FMRP and FXR1 to deliver mRNAs essential for sperm flagellar assembly, linking disrupted mRNA transport to reduced abundance of key structural and ...
Chunbo Xie, Sibing Yi, Xinle Lin, Shen Zhang, Weili Wang, Shimin Yuan, Lanlan Meng, Yong Li, Chen Tan, Chunjia Wei, Yanyan Yu, Yaoqiong Liang, Huan Zhang, Liang Hu, Guangxiu Lu, Wenbin He, Qianjun Zhang, Juan Du, Ge Lin, Chaofeng Tu, Yue‐Qiu Tan   +20 more
wiley   +1 more source

Semen quality analysis of military personnel from six geographical areas of the People’s Republic of China [PDF]

, 2011
Objective: To examine the determinants of semen quality in a large sample of military personnel from different geographical areas of the People's Republic of China. Design: Cross-sectional study.
Haixiang Hu, Zou, Z.K., Kenneth McElreavey, McElreavey, K., Manshu Song, Shen, Y.L., Yanling Shen, Zhikang Zou, Guo, Xi.H., Alan H. Bittles, Wang, W., Hu, H.X., Wei Wang, Xiuhua Guo, Song, M.S., Bittles, A.H.   +15 more
core   +1 more source

eEF1G Orchestrates Translation to Ensure Meiotic Progression in Transcriptionally Quiescent Spermatocytes

Advanced Science, EarlyView.
eEF1G supports translation elongation of meiotic mRNAs in transcriptionally quiescent leptotene and zygotene spermatocytes. Its depletion in germ cells causes meiotic arrest at the zygotene stage, with defective homologous synapsis and unstable recombination intermediates.
Jianze Xu, Yuwei Hu, Xukun Lu, Yuling Cai, Tongtong Li, Ming Gao, Jinlong Ma, Yuan Gao, Shangming Liu, Zi‐Jiang Chen, Jing Meng, Hongbin Liu, Xiaohua Jiang   +12 more
wiley   +1 more source

Cryptic male choice: sperm allocation strategies when female quality varies [PDF]

, 2002
Reinhold K, Kurtz J, Engqvist L. Cryptic male choice: sperm allocation strategies when female quality varies. Journal of Evolutionary Biology. 2002;15(2):201-209.We examined evolutionary stable sperm allocation and included stochastic variation in male ...
Reinhold, Klaus, Engqvist, Leif ; https://orcid.org/, Kurtz, Joachim   +2 more
core   +1 more source