Ovarian stimulation of male steroids is the culprit behind this disorder.
A woman finds herself with excessive facial hair, obesity, menstrual abnormalities, infertility, and enlarged ovaries may have polycystic ovary syndrome (PCOS), an unfortunate condition thought to be caused by excessive secretion by the ovaries of androgen, a hormone associated with male characteristics. Men and women both have hormones expressing male and female characteristics. Yet, the cause of this excessive secretion of a hormone leading to undesired gender traits remains unclear.
Estimates of incidence of this disorder range around the five percent level if both cessation of ovulation and excess hair growth are used in the definition, but they can range over 10 percent in some select populations. Past research emphasized the relative roles of neuroendocrine abnormalities leading to persistent and excessive secretion of luteinizing hormones (LH), one of two glycoprotein hormones that stimulate the final ripening of the follicles and the secretion of progesterone; and the ovarian actions increased insulin in plasma, a consequence of insulin resistance. Additional evidence suggests that unnatural ovarian production of hormonal steroids is a primary abnormality in PCOS.
Donna Krupa | EurekAlert!
Amputees can learn to control a robotic arm with their minds
28.11.2017 | University of Chicago Medical Center
The importance of biodiversity in forests could increase due to climate change
17.11.2017 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
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