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Related Concept Videos

Centrifugation01:05

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Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
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The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
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Sperm Collection of Differential Quality Using Density Gradient Centrifugation
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Changes in bull sperm kinematics after single layer centrifugation.

Y Yulnawati1, M C Abraham, D Laskowski

  • 1Division of Reproduction, Department of Clinical Sciences, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden; Research Center for Biotechnology, Indonesian Institute of Sciences (LIPI), Cibinong, Bogor, Indonesia.

Reproduction in Domestic Animals = Zuchthygiene
|September 25, 2014
PubMed
Summary

Single Layer Centrifugation (SLC) improved bull sperm kinematics, enhancing straightness and linearity without affecting total or progressive motility. This technique shows promise for improving sperm quality for artificial insemination.

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Area of Science:

  • Veterinary Science
  • Reproductive Biology
  • Sperm Motility Analysis

Background:

  • Sperm quality is crucial for artificial insemination success.
  • Centrifugation techniques can be used to select for more motile sperm populations.
  • Single Layer Centrifugation (SLC) is a method for sperm separation.

Purpose of the Study:

  • To evaluate the effect of Single Layer Centrifugation (SLC) on bull sperm kinematics.
  • To determine if SLC improves sperm parameters relevant to fertilization.

Main Methods:

  • Ejaculates from 20 bulls were processed using Single Layer Centrifugation (SLC) with Androcoll-B.
  • Sperm kinematics were measured in both uncentrifuged and SLC-selected samples.
  • Key kinematic parameters including motility, straightness, linearity, and velocity were analyzed.

Main Results:

  • Total and progressive motility remained similar between uncentrifuged and SLC samples.
  • SLC significantly increased sperm straightness (STR), linearity (LIN), and beat cross frequency (BCF).
  • SLC significantly decreased average path velocity (VAP), curvilinear velocity (VCL), amplitude of lateral head deviation (ALH), and hypermotility.

Conclusions:

  • Single Layer Centrifugation (SLC) does not directly impact total or progressive bull sperm motility.
  • SLC positively influences specific kinematic parameters, potentially enhancing fertilization capacity.
  • The kinematic improvements from SLC were most pronounced in samples with initially poorer motility.