Results 31 to 40 of about 7,530 (183)

Spermiogenesis and sperm ultrastructure of Asetocalamyzas laonicola Tzetlin, 1985 (Polychaeta), an ectoparasite of the large spionid Scolelepis cf. matsugae Sikorsfi, 1994, from the White Sea

Scientia Marina, 2006
The sperm ultrastructure and spermatogenesis of the ectoparasitic polychaete Asetocalamyzas laonicola Tzetlin, 1985 (Calamyzidae) is investigated. The male cells are located freely in the coelom.
Elena V. Vortsepneva, Anna E. Zhadan, Alexander B. Tzetlin   +2 more
doaj   +1 more source

Comparing the efficacy of dextrose, mannitol, and saline solutions in male rabbits' chemical castration

Animal Models and Experimental Medicine, EarlyView.
Our study demonstrated that a single bilateral intra‐testicular injection of 50% dextrose (Group A) and 20% mannitol (Group B) solutions cannot serve as chemical sterilizing agents in male rabbits. However, intra‐testicular injection of 0.9% saline (Group C) significantly reduced the seminiferous tubule quality (STQ), seminiferous tubule maturity (STM),
Mohammad‐Javad Gholizadeh, Reza Azargoun, Ali Shalizar‐Jalali   +2 more
wiley   +1 more source

Multiple Roles of Protamine Kinase SRPK1 and Phosphatase PP1γ in Sperm Development

PROTEOMICS, EarlyView.
ABSTRACT Protein phosphorylation regulates key events of male germ cell differentiation. In the testis, SRPK1 and PP1γ are involved in protamine phosphorylation and dephosphorylation, respectively, and their deregulation is linked to defective chromatin structure and male infertility.
Alberto de la Iglesia, Mélina Blanco, Meritxell Jodar, Olivier Feudjio, Marjorie Leduc, Judit Castillo, Julie Cocquet, Rafael Oliva   +7 more
wiley   +1 more source

Comparative aspects of mammalian spermiogenesis. [PDF]

Scanning electron microscopy, 1986
The testes of some different orders of eutherian mammals were examined by conventional electron microscopy with respect to their pattern of spermiogenesis. In addition, some of the testes were studied by cytochemical methods for demonstration of certain nuclear proteins and of glycoproteins in the acrosome and the plasma membrane of spermatids.
Plöen, Leif, Courtens, Jean-Luc
openaire   +2 more sources

Synergistic Toxicity of Low‐Concentration Metal Mixture on Male Rats: Reproductive, Renal, and Hepatic Effects

Environmental Toxicology, EarlyView.
ABSTRACT Mining plays a crucial role in economic development, but improper management can lead to severe environmental degradation. Particularly for iron ore, mining generates vast amounts of tailings often stored in unstable dams. This study aims to investigate the toxicological impacts of environmentally relevant concentrations of metals mixture ...
Kalinka Helóra Gomes de Almeida, Thalita Tofanin Sargiani D'Assumpção, Ana Priscila Gomes Silva, Carolina Rocha Moreira de Oliveira, Tailisi Hoppe Trevizani, Rubens Cesar Lopes Figueira, Lucas Buruaem Moreira, Juliana Elaine Perobelli   +7 more
wiley   +1 more source

Multi‐Omics Analysis Reveals Coordinated Adaptations in Genes, Metabolism, and Gut Microbiota Underpinning Herbivory in Lordiphosa Flies

Integrative Zoology, EarlyView.
Multi‐omics analysis reveals that herbivorous adaptation in Lordiphosa flies arises from coordinated interactions across the genome, transcriptome, and gut microbiota: genomic expansions of detoxification (e.g., cytochrome P450s) and carbohydrate metabolism gene families, transcriptomic upregulation of energy pathways like lipid oxidation and ...
Run Guo, Jianjun Gao, Caixian Zhang, Zhiheng Chang, Yanbo Sun   +4 more
wiley   +1 more source

The use of deidentified organ donor testes for research

Andrology, EarlyView.
Abstract Our knowledge of testis development and function mainly comes from research using mammalian model organisms, primarily the mouse. However, there are integral differences between men and other mammalian species regarding cellular composition and expression profiles during fetal and post‐natal testis development and in the mature testis ...
Marina V. Pryzhkova, Marnie W. Skinner, Juliana I. Candelaria, Stephen R. Wellard, Philip W. Jordan   +4 more
wiley   +1 more source

Essential Role of Histone Replacement and Modifications in Male Fertility

Frontiers in Genetics, 2019
Spermiogenesis is a complex cellular differentiation process that the germ cells undergo a distinct morphological change, and the protamines replace the core histones to facilitate chromatin compaction in the sperm head. Recent studies show the essential
Tong Wang, Hui Gao, Wei Li, Wei Li, Chao Liu, Chao Liu   +5 more
doaj   +1 more source

Iqcg is essential for sperm flagellum formation in mice. [PDF]

PLoS ONE, 2014
Mammalian spermatogenesis comprises three successive phases: mitosis phase, meiosis phase, and spermiogenesis. During spermiogenesis, round spermatid undergoes dramatic morphogenesis to give rise to mature spermatozoon, including the condensation and ...
Ren-Ke Li, Jue-Ling Tan, Li-Ting Chen, Jing-Sheng Feng, Wen-Xue Liang, Xue-Jiang Guo, Ping Liu, Zhu Chen, Jia-Hao Sha, Yi-Fei Wang, Sai-Juan Chen   +10 more
doaj   +1 more source

Centrosome Reduction during Mouse Spermiogenesis

Developmental Biology, 1998
The sperm does not contribute the centrosome during murine fertilization. To determine the manner in which a functional centrosome is reduced, we have studied centrosome degeneration during spermiogenesis of mice. The round spermatids display normal centrosomes consisting of a pair of centrioles along with gamma-tubulin containing foci.
Manandhar, G., Sutovsky, P., Joshi, H.C., Stearns, T., Schatten, G.   +4 more
openaire   +2 more sources