Results 91 to 100 of about 370,507 (192)

Comparison Between Different DNA and Conventional

مجله كليه طب الكندي, 2012
Background: The discriminative power of the classical WHO parameters in relation to male fertility is quite low, because they only address few aspects of sperm quality and function.
Estabraq . , A Rasool1, Omar . , F Abdul-Rasheed1, Ali F. AL-Hashimi   +2 more
doaj  

Structural and Ultrastructural Assessment of the Sperm Annulus in Men with Immotile Short-tail Sperm Defects Compared to Normozoospermic Controls: A Case–control Study

Journal of Human Reproductive Sciences
Background: The sperm annulus is a fibrous ring structure formed by septin proteins. It connects the mid-piece and principal piece of the sperm flagellum in mammals and plays a crucial role in flagellar stability and motility Aim: This study aimed to ...
Mahsa Allahgholi, Alemeh Rafaee, Mohammad Ali Sadighi Gilani, Marjan Sabbaghian   +3 more
doaj   +1 more source

Decline in human sperm counts during the past 50 years? [PDF]

, 2005
There is widespread concern that environmental pollutants acting as xenoestrogens may affect human fertility adversely. Whether this has already made an impact on human fertility worldwide remains debatable at the present stage.
Souza, Urban JAD, Pinto, Maxim, Jayachandra, Srinivasa   +2 more
core  

PRSS50 is a testis protease responsible for proper sperm tail formation and function.

Development, 2021
Scovell JM, Bournat JC, Szafran AT, Solis M, Moore J, Rivera A, Chen CH, Zhang J, Wilken N, Seth A, Jorgez CJ.   +10 more
europepmc   +1 more source

On Functional Central Limit Theorems for Dependent, Heterogeneous Tail Arrays with Applications to Tail Index and Tail Dependence Estimators [PDF]

We establish functional central limit theorems for a broad class of dependent, heterogeneous tail arrays encountered in the extreme value literature, including extremal exceedances, tail empirical processes and tail empirical quantile processes.
Jonathan Hill
core  

Analysis of ultrastructural defects in sperm by transmission electron microscopy in asthenozoospermia patients: a study from multiple centers across China

Biomarker Research
This study aimed to identify the ultrastructural features of sperm in Chinese asthenozoospermia patients and to evaluate their clinical implications.
Mo-qi Lv, Hai-xu Wang, Hou-yang Chen, Jun-cheng Gao, Hai-feng Song, Yu-dong Zhang, Tao Li, Xiao-hui Ling, Lin-jie Zhu, Jun-ren Nong, Yu-jiao Tong, Liang-cai Lu, Yun-jie Wen, Yue-xiao Wang, Guang-yu Qin, Jing Li, Guan-chen Liu, Yan-qi Yang, Pan Ge, Nan Zhang, Rui-fang Sun, Ying Sun, Jian Zhang, He-cheng Li, Yi-na Jiang, Ming Liu, Dang-xia Zhou   +26 more
doaj   +1 more source

A sperm's tail: the importance of getting it right [PDF]

Human Reproduction, 2011
openaire   +2 more sources

A lumenal interrupted helix in human sperm tail microtubules. [PDF]

Sci Rep, 2018
Zabeo D, Heumann JM, Schwartz CL, Suzuki-Shinjo A, Morgan G, Widlund PO, Höög JL.   +6 more
europepmc   +1 more source

Variation in sperm whale (Physeter macrocephalus) coda vocalizations and social structure in the North Atlantic Ocean [PDF]

, 2009
This study aimed at complementing studies of sperm whale social and vocal behaviour that were restricted to the Pacific Ocean. The characteristic multi-pulsed structure of sperm whale clicks allows for estimation of whales' size from measurements of ...
Antunes, Ricardo
core  

Positioning of sperm tail longitudinal columns depends on NSUN7, an RNA-binding protein destabilizing elongated spermatid transcripts. [PDF]

RNA
Guseva EA, Averina OA, Isaev SV, Pletnev PI, Bragina EE, Permyakov OA, Buev VS, Priymak AV, Emelianova MA, Pshanichnaya L, Romanov EA, Novikova SE, Petriukov KS, Golovina AY, Grigorieva OO, Manskikh VN, Korshunova DS, Silaeva YY, Deykin AV, Rubtsova MP, Zgoda VG, Mazur AM, Prokhortchouk EB, Dontsova OA, Sergiev PV.   +24 more
europepmc   +1 more source