The ejaculate contains millions of spermatozoa, but there are remarkable individual variations in semen characteristics; e.g. sperm count (concentration, total number of spermatozoa, motility and viability). The human semen is unique when compared with other...
Sperm-specific ion channels or CatSper has been described in 2001 by Ren et al. . CatSper is a six-transmembrane-spanning repeat of the voltage-dependent Ca 2+ channels located in the principal piece of the sperm tail. The sperm from CatSper knockout mice showed poor motility and could not fertilize eggs with an intact zona pellucida.
Oxidative stress is an important factor affecting the quality of spermatozoa during liquid storage of boar semen; however, monitoring of reactive oxygen species (ROS) that provides direct insight into the oxidative status is not yet attempted. This study aimed to monitor ROS in …
struktur spermatozoa antar spesies adalah bentuk kepala, kepala spermatozoa tikus berupa kait, dapat dilihat pada Gambar 4. 4. SIMPULAN Struktur spermatozoa dari tikus putih jantan yang …
By comparing sperm protein profiles, many proteins involved in the acquisition of fertilizing ability have been identified. Furthermore, altered abundance of specific protein groups has been observed in a wide range of infertile phenotypes, including asthenozoospermia, oligozoospermia, and normozoospermia with unsuccessful assisted reproductive ...
a mature male germ cell, the specific output of the testes, which fertilizes the mature ovum (secondary oocyte) in sexual reproduction. It is microscopic in size, looks like a translucent …
Want to create or adapt books like this? Learn more about how Pressbooks supports open publishing practices.
After excluding all non-sperm cells, each probe was coupled to a suitable stain to eliminate also semen apoptotic bodies and non-viable spermatozoa: Merocyanine 540 (M540) for CM-H2DCFDA and CellROX Green, and LIVE/DEAD Fixable Green Dead Cell Stain (LD-G) for MitoSOX Red. We found that CM-H2DCFDA was confined in the sperm midpiece, whereas ...
Spermatozoa are produced in the seminiferous tubules of the testes. The developmental stages of the germ cell are the spermatogonium, spermatocyte, spermatid, and finally spermatozoon. When mature, the spermatozoa are carried in the semen. At the climax of coitus, the semen is discharged into the vagina of the .
The percentage of X chromosome simental cattle spermatozoa was (44.38%) and Y chromosome spermatozoa was (55.62%), while the percentage of X chromosome Ongole cattle spermatozoa was (45.83) and Y ...
This page introduces spermatogenesis the development of spermatozoa, the male haploid gamete cell. In humans at puberty, spermatozoa are produced by spermatogonia meiosis in the seminiferous tubules of the …
Background: The cellular and molecular mechanisms of the events that help spermatozoa acquire their fertilizing capability during capacitation and acrosome reaction are not completely understood. Objective: This study was performed with a postulation that identification of sperm proteins and their changes during in vitro capacitation and acrosome reaction will unravel …
Background: The optimization of spermatozoa preparation techniques in order to obtain cell fractions enriched with structurally and functionally "superior" spermatozoa is a key objective of the assisted reproduction industry. Objectives: The purpose of this study was to evaluate a recent development of an electrophoretic spermatozoa separation device (Felix™, Memphasys Ltd, …
Spermatozoa with altered chromatin condensation perturb the dynamics of DNA methylation reprogramming in the paternal pronucleus resulting in disordered active DNA demethylation followed by de novo methylation patterns. In addition, there was a tendency of decreased size in both paternal and maternal pronuclei after fertilization of oocytes ...
Spermiogenesis converts round spermatids into highly specialized spermatozoa, equipped for fertilization. This stage involves a series of morphological and structural changes, each finely tuned to optimize the sperm's functionality.
Spermatozoa are highly vulnerable to oxidative attack because they lack significant antioxidant protection due to the limited volume and restricted distribution of cytoplasmic space in which to house an appropriate armoury of defensive enzymes. In particular, sperm membrane lipids are susceptible to …
As spermatozoa were stored over time, ovarian complement proteins were progressively repressed by tryptophan and hippurate, indicating a remarkable adaptation of spermatozoa to the ovarian microenvironment. Before fertilization, a notable upregulation of cellular junction proteins was observed. The study revealed that spermatozoa bind to ZPB2a ...
Эмийн тоосонцор ба нунтаг шинж чанар нь эмийн үйлдвэрлэлийн үйл явц, бүтээгдэхүүний гол түлхүүр юм. Бүрэн хэмжээ, тоос нь ялангуяа ...
The 100,000th scientific article on the subject of spermatozoa was recently published. Numerous studies evaluated the characteristics of this important cell that led to tremendous discoveries. Since its first observation and description in 1677, many important characteristics have been de …
Survival of spermatozoa at low temperatures. Survival of spermatozoa at low temperatures Nature. 1950 Oct 21;166(4225):668-9. doi: 10.1038/166668a0. Authors A U SMITH, C POLGE. PMID: 14780190 DOI: 10.1038/166668a0 No abstract available. MeSH terms Cold …
Human spermatozoa are the archetype of long-term self-organizing transport in nature and are critical for reproductive success. They utilize coordinated head and flagellar movements to swim long distances within the reproductive tract in order to find and fertilize the egg. However, to date, long-term analysis of the sperm head-flagellar ...
The identification of mature spermatids and spermatozoa occurs through specific morphological processes. Induction of pregnancies can occur through specialized techniques that extract spermatozoa from testicular …
The mean percentage of sperm with residual cytoplasm was statistically significantly different in all three groups. Infertile men with varicocele had the highest percentage of sperm with cytoplasmic droplets, the next highest level being in men with idiopathic infertility and the lowest level in fertile controls (11.7 +/- 1.0, 8.1 +/- 0.9 and 3 ...
Purpose: We developed an artificial neural network (ANN) for predicting spermatozoa prior to testicular biopsy in men with nonobstructive azoospermia. The performance of this ANN was compared to that of the standard logistic regression (LR) model. Materials and methods: Data were retrospectively collected from the physical examination and laboratory records of 303 …
Zika virus in semen and spermatozoa. Zika virus in semen and spermatozoa Lancet Infect Dis. 2016 Oct;16(10):1106-1107. doi: 10.1016/S1473-3099(16)30336-X. Epub 2016 Sep 19. Authors Jean Michel Mansuy ...
A spermatozoon (in plural spermatozoa) is a motile sperm cell, that is, the reproductive cell of human males, carried in semen, that fertilizes the ovum to create a new human being, while the term sperm is commonly used to refer to the semen.
jumlah spermatozoa per unit volume (ml) air mani. Total jumlah spermatozoa mengacu pada jumlah total spermatozoa di seluruh ejakulasi dan didapatkan dengan mengalikan konsentrasi sperma oleh volume air mani.17 Jumlah semen yang biaa diejakulasikan pada setiap koitus rata-rata sekitar 3,5 mililiter dan setiap mililiter semen mengandung rata ...
Human spermatozoa filmed with SFA-500 device from Biola LTD.jpg 640 × 480; 278 KB Kamikaze sperm.jpg 695 × 343; 36 KB Meyers b14 s0253 b1.png 350 × 490; 21 KB
yang berisikan tentang kajian yang mendasar tentang isiologi spermatozoa yang meliputi: Kapasitasi, Reaksi Akrosom dan Fertilisasi, Selain itu di dalam buku ini dilengkapi dengan Inseminasi Buatan yang merupakan pengembangan …
Cryopreservation has been routinely used to preserve sperm of human and different animal species. However, frozen sperm storage for a long time brings many inconveniences because of liquid nitrogen. Many attempts have been made to overcome the disadvantages of the current cryopreservation method. Fr …