The morphology and ultrastructure of Bullacta exarata spermatozoa observed by light and transmission electron microscopy are presented in this paper. The spermatozoa is composed of head with a simple acrosomal complex and an elongated nucleus, and tail with a midpiece, principal piece and an end piece. The midpiece consists of a mitochondrial ring, and the principal piece is composed of axoneme and lateral fin. The structure of B. exarata spermatozoa differs significantly from that of other gastropods, especially in the lateral fin and the principal piece, which was described scarcely before. A comparison is made between B. exarata and other gastropods, and its significance on reproductive evolution and physio-ecological adaptation is preliminarily discussed.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1388726 | PMC |
| http://dx.doi.org/10.1631/jzus.2004.1211 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
[Establishment of a quality grading standard of Isatidis Radix decoction pieces based on appearance traits and internal quality indexes].
Zhongguo Zhong Yao Za Zhi
December 2024
Institute of International Standardization for Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine Shanghai 201203, China Shanghai Academy of International Standardization for Traditional Chinese Medicine Shanghai 201203, China.
This study aims to establish a quality grading standard that combines the conventional quality evaluation based on morphological characteristics of traditional Chinese medicine with the modern quality evaluation. Based on the existing standards and market circulation of Isatidis Radix, the diameter and color of Isatidis Radix decoction pieces were selected as the appearance traits for preliminary grading. The effects of internal quality indexes such as moisture, total ash, acid-insoluble ash, ethanol-soluble extractives, and 9 water-soluble components on different grades of decoction pieces were comprehensively compared, and the key grading indexes were determined by t-test.
View Article and Find Full Text PDFMultidimensional morphological analysis of live sperm based on multiple-target tracking.
Comput Struct Biotechnol J
December 2024
Department of Assisted Reproduction, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, China.
Manual semen evaluation methods are subjective and time-consuming. In this study, a deep learning algorithmic framework was designed to enable non-invasive multidimensional morphological analysis of live sperm in motion, improve current clinical sperm morphology testing methods, and significantly contribute to the advancement of assisted reproductive technologies. We improved the FairMOT tracking algorithm by incorporating the distance and angle of the same sperm head movement in adjacent frames, as well as the head target detection frame IOU value, into the cost function of the Hungarian matching algorithm.
View Article and Find Full Text PDFResearch Progress of Ribosomal Proteins in Reproductive Development.
Int J Mol Sci
December 2024
College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China.
Ribosomal proteins constitute the principal components of ribosomes, and their functions span a wide spectrum. Recent investigations have unveiled their involvement in oocyte and embryo development, playing a pivotal role in reproductive development. Numerous pieces of evidence indicate that ribosomal proteins participate in the regulation of various cellular activities, including nucleolar stress, oxidative stress, cell proliferation and autophagy.
View Article and Find Full Text PDFThe annulus: composition, role and importance in sperm flagellum biogenesis and male fertility.
Basic Clin Androl
December 2024
Institute for Advanced Biosciences, INSERM U 1209, CNRS UMR 5309, Université Grenoble Alpes, Team 'Physiopathology and Pathophysiology of Sperm cells', 38000, Grenoble, France.
The annulus is an electron-dense ring structure that surrounds the axoneme and compartmentalizes the sperm flagellum into two parts: the midpiece and the principal piece. The function of the annulus as a diffusion barrier in the mature spermatozoon is now well described but its function during spermiogenesis remains unclear. The intriguing spatio-temporal dynamics of the annulus during spermiogenesis and its position at the interface of the two main flagellar compartments have been highlighted for more than 50 years, and suggest a major role in this process.
View Article and Find Full Text PDFAutopsy of a Hemodialysis Machine: Potential for Recycling at the End of the Life Cycle.
J Am Soc Nephrol
December 2024
Néphrologie et dialyse, Centre Hospitalier Le Mans, 194 Avenue Rubillard, 72037 Le Mans, France.
Background: Hemodialysis (HD) contributes significantly to healthcare's carbon footprint. Worldwide about 100,000 dialysis machines end their life cycle each year. Our aim was to analyze the composition and the potential for recyclability of two dialysis machines, from the two companies with the largest market share, which had met their end-of-use terms (10-12 years of use according to French regulations).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!