Results 61 to 70 of about 110,429 (168)

Análise invasiva e não invasiva do fuso meiótico de oócitos humanos obtidos de ciclos estimulados: dados preliminares Invasive and noninvasive analysis of the meiotic spindle of human oocytes obtained from stimulate cycles: preliminary results

Revista Brasileira de Ginecologia e Obstetrícia, 2012
OBJETIVOS: Avaliar a concordância entre as técnicas de microscopia de polarização e microscopia confocal na avaliação do fuso meiótico de oócitos humanos maturados in vivo.
Luciana Azôr Dib, Michele Gomes da Broi, Maria Cristina Picinato Medeiros de Araújo, Roberta Cristina Giorgenon, Rui Alberto Ferriani, Paula Andrea de Albuquerque Sales Navarro   +5 more
doaj   +1 more source

Anatomical and Histological Descriptions of the Male Reproductive System of the Alfalfa Weevil of Hypera postica (Gyllenhal, 1813) (Coleoptera: Curculionidae) Using Light and Scanning Electron Microscopies

Acta Zoologica, EarlyView.
ABSTRACT Features of the reproductive organs, such as the number of testicular follicles, testis colour and the morphology of the glands, can be used as systematic characters. For this purpose, this paper was the first description of the male reproductive system anatomy and histology of Hypera postica (Gyllenhal, 1813) (Coleoptera: Curculionidae), a ...
Nurcan Özyurt Koçakoğlu, Selami Candan, Hicret Arslan, Mustafa Güllü   +3 more
wiley   +1 more source

MRE11 orchestrates porcine oocyte meiotic progression by modulating the spindle assembly checkpoint

Frontiers in Cell and Developmental Biology
IntroductionMre11 is a multisubunit nuclease involved in DNA repair, and its dysfunction often causes DNA damage sensitivity, genomic instability, telomere shortening, and aberrant meiosis.
Dandan Zhang, Zaishan Yang, Yongteng Zhang, Fugui Fang, Hongguo Cao, Yunsheng Li, Zubing Cao, Yanfeng Xue, Mianqun Zhang   +8 more
doaj   +1 more source

Dynamic organelle distribution initiates actin-based spindle migration in mouse oocytes

Nature Communications, 2020
Mammalian oocytes divide asymmetrically during meiotic maturation. Here, the authors show that spindle movement away from oocyte center depends on actin filaments nucleated from the spindle periphery pushing against surrounding mitochondria, which ...
Xing Duan, Yizeng Li, Kexi Yi, Fengli Guo, HaiYang Wang, Pei-Hsun Wu, Jing Yang, Devin B. Mair, Edwin Angelo Morales, Petr Kalab, Denis Wirtz, Sean X. Sun, Rong Li   +12 more
doaj   +1 more source

Bisphenol B Exposure Disrupts Mouse Oocyte Meiotic Maturation in vitro Through Affecting Spindle Assembly and Chromosome Alignment

Frontiers in Cell and Developmental Biology, 2020
Bisphenol B (BPB), a substitute of bisphenol A (BPA), is widely used in the polycarbonate plastic and resins production. However, BPB proved to be not a safe alternative to BPA, and as an endocrine disruptor, it can harm the health of humans and animals.
Shou-Xin Zhang, Shou-Xin Zhang, Zhi-Ming Ding, Muhammad Jamil Ahmad, Yong-Sheng Wang, Ze-Qun Duan, Yi-Liang Miao, Jia-Jun Xiong, Li-Jun Huo, Li-Jun Huo   +9 more
doaj   +1 more source

New Considerations on Meiosis, Affinity and Genomic Constitution in Aneuploids and Interploid Hybrids of Urochloa P. Beauv. (Brachiaria)

Plant Breeding, EarlyView.
ABSTRACT The combination of polyploidy, apomixis and the formation of aneuploid and interploid hybrids makes the genus Urochloa an interesting system for investigating meiotic stability and genome behaviour in grasses. In this study, routine meiotic analysis and genomic in situ hybridization (GISH) were used to (i) evaluate meiosis in three hybrids of ...
Isabella Campos Moraes, Pedro Henrique Mendes Carvalho, Fausto Souza Sobrinho, Vânia Helena Techio   +3 more
wiley   +1 more source

Cultivar‐Specific Production of Unreduced Pollen in the Ornamental Bigleaf Hydrangea (Hydrangea macrophylla ssp. macrophylla)

Plant Breeding, EarlyView.
ABSTRACT Unreduced gametes naturally promote polyploidization and are valuable in breeding polyploid offspring. Bigleaf hydrangea (Hydrangea macrophylla ssp. macrophylla), a major ornamental crop, has shown spontaneous polyploidization rates ranging from 0% to 94% in previous crosses.
Conny Tränkner, Anke Müller
wiley   +1 more source

Irr1/Scc3 Cohesin Interacts with Rec8 in Meiotic Prophase of Saccharomyces cerevisiae [PDF]

, 2011
The meiotic cohesin complex of S. cerevisiae shares with the mitotic one the Irr1/Scc3, Smc1, and Smc3 subunits, while the meiosis-specific subunit Rec8 re-places mitotic subunit Scc1/Mcd1.
Cena, Agata, Kurlandzka, Anna, Agata Cena, Piotr Kowalec, Plochocka, Danuta, Danuta Płochocka, Kowalec, Piotr, Anna Kurl   +7 more
core  

Spindle tubulin and MTOC asymmetries may explain meiotic drive in oocytes

, 2018
In the first meiotic division (MI) of oocytes, the cortically positioned spindle causes bivalent segregation in which only the centre-facing homolog pairs are retained.
Jones, Keith T., Wu, Tianyu, Morgan, Stephanie L., Lane, Simon I. R., Tianyu Wu, Simon I. R. Lane, Stephanie L. Morgan, Keith T. Jones   +7 more
core   +1 more source

B-type nuclear lamin and the nuclear pore complex Nup107-160 influences maintenance of the spindle envelope required for cytokinesis in Drosophila male meiosis

Biology Open, 2016
In higher eukaryotes, nuclear envelope (NE) disassembly allows chromatin to condense and spindle microtubules to access kinetochores. The nuclear lamina, which strengthens the NE, is composed of a polymer meshwork made of A- and B-type lamins.
Daisuke Hayashi, Karin Tanabe, Hiroka Katsube, Yoshihiro H. Inoue   +3 more
doaj   +1 more source