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Related Concept Videos

Osmosis00:47

Osmosis

Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is of paramount importance. Osmosis is the movement of water across a semipermeable membrane, such as a cell’s plasma membrane. In living organisms, water plays a crucial role as a solvent—a molecule that dissolves other molecules.Diffusion Versus OsmosisBoth diffusion and osmosis are types of passive transport—cellular transport that does not require...
Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
Obedience01:08

Obedience

According to obedience research, we may harm others under the forceful pressures of an authority figure (Milgram, 1974). How about if the inappropriate orders were delivered with less force? The increasing interdependence between nurses and physicians compelled Hofling and his colleagues to explore nurses’ reactions to a potentially harmful medical request made by the perceived authority figure, the doctor (Hofling, Brotzman, Dalrymple, Graves, & Pierce, 1966). In this situation, obedience...
Osmosis01:30

Osmosis

Osmosis is the movement of free water molecules through a semipermeable membrane.  The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
Water, like other substances, moves from a high concentration of free water...
Ovaries01:26

Ovaries

The ovaries are roughly the size of almonds and measure approximately 2 to 3 centimeters in length. These paired structures are situated within the pelvic region and are anchored by the mesovarium—a peritoneal extension that also connects them to the wider structure of the broad ligament. The support system extends to the suspensory ligament, housing blood and lymphatic vessels. In addition, the ovarian ligament tethers the ovaries to the uterus.
On the ovarian surface, a layer of cuboidal...
Oogenesis01:22

Oogenesis

Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is known...

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Related Experiment Video

Updated: Jul 6, 2026

Microscopy of Fission Yeast Sexual Lifecycle
07:47

Microscopy of Fission Yeast Sexual Lifecycle

Published on: March 9, 2016

14.5K

Omaya Dudin.

Omaya Dudin1

  • 1Department of Biochemistry, University of Geneva, Geneva, Switzerland.

Current Biology : CB
|June 10, 2025
PubMed
Summary

Omaya Dudin researches how unicellular organisms evolved multicellularity using Ichthyosporea models. This study explores the evolutionary transitions from single-celled to multicellular life.

Area of Science:

  • Evolutionary Biology
  • Cell Biology
  • Microbiology

Background:

  • Investigating the evolutionary origins of multicellularity is a fundamental question in biology.
  • Unicellular organisms offer tractable models to study the transition to multicellular life.

Discussion:

  • Ichthyosporea serve as a model system to dissect the genetic and environmental factors driving multicellularity.
  • Understanding these evolutionary pathways can shed light on the development of complex life forms.

Key Insights:

  • The research focuses on the specific mechanisms and selective pressures that led unicellular organisms to aggregate and cooperate.
  • Omaya Dudin's work at the University of Geneva provides novel insights into early multicellular evolution.

Outlook:

Related Experiment Videos

Last Updated: Jul 6, 2026

Microscopy of Fission Yeast Sexual Lifecycle
07:47

Microscopy of Fission Yeast Sexual Lifecycle

Published on: March 9, 2016

14.5K
  • Future research may involve comparative genomics and experimental evolution with Ichthyosporea.
  • This work contributes to a broader understanding of major evolutionary transitions in life's history.