Hormone in crab eyes makes it possible for females to mate and care for their young
February 04, 2014
Those two crooked beady eyes peeking out of a the shell do more than just help blue crabs spot food in the murky waters of the Chesapeake Bay. They also produce important hormones responsible for the growth and development of a crab from an adolescent into a full-fledged adult. Scientists at the Institute of Marine and Environmental Technology in Maryland recently discovered a new hormone in those eyestalks responsible for forming body parts that make it possible for female crabs to mate and raise young.
"This is the first definitive evidence for the presence of a female-specific hormone in crabs that regulates the development of structures essential for mating and caring for their eggs," said author J. Sook Chung, an associate professor with the University of Maryland Center for Environmental Science. "This hormone is required for maternal care."
Scientists found that this crustacean female sex hormone (CSFH), present in the eyestalk of female blue crabs, or Calinectes sapidus, is integral to the maturation of the crab and development of reproductive structures needed for brooding and mating.
"For the first time in crustaceans, a substance that is critically involved in the control of expression of relevant adult anatomic features in females has been identified," said Russell Hill, Director of the Institute of Marine and Environmental Technology. "This is very significant basic research on a molecular level that also may have practical application in the future, as with most of the important research at IMET".
Female crabs mate only once in their lives, at the very moment that they molt for the final time and reach maturity. The female sex hormones trigger the development of a pair of special receptacles, called spemathecae, that store microscopic packets of sperm, or spermatophores, from the male crab. After mating, the sperm lives in these sacs for up to two years and will be used by the female crab several times to produce more fertilized eggs.
The hormone also triggers the development of hair-like external structures that hold fertilized eggs outside the female's body. The female crab extrudes more than two million eggs into a sponge-like mass that remains attached to her abdomen until the larvae emerge.
University of Maryland Center for Environmental Science
Related Hormone Current Events and Hormone News ArticlesSteroid links fat accumulation with egg development
Nutrition and metabolism are closely linked with reproductive health. Several reproductive disorders including polycystic ovary syndrome, amenorrhea, and ovarian cancer have been linked to malnutrition, diabetes, and obesity. Stem cells show promise for reversing type 2 diabetes
Scientists at the University of British Columbia and BetaLogics, part of Janssen Research & Development, LLC have shown for the first time that Type 2 diabetes can be effectively treated with a combination of specially-cultured stem cells and conventional diabetes drugs.Why people with diabetes can't buy generic insulin
A generic version of insulin, the lifesaving diabetes drug used by 6 million people in the United States, has never been available in this country because drug companies have made incremental improvements that kept insulin under patent from 1923 to 2014. Melatonin can help you get a good night's sleep in a noisy environment
Using melatonin could provide more and better quality sleep compared to using an eye mask and earplugs in a simulated noisy and illuminated environment, according to research published in open access journal Critical Care.How planthoppers got their wings
Each year, rice in Asia faces a big threat from a sesame seed-sized insect called the brown planthopper. Now, a study reveals the molecular switch that enables some planthoppers to develop short wings and others long -- a major factor in their ability to invade new rice fields.An antihypertensive drug improves corticosteroid-based skin treatments
Basic research on blood pressure has led researchers from Inserm (Inserm Unit 1138, "Cordeliers Research Centre") to obtain unexpected results: drugs used to treat hypertension (high blood pressure) reduce side effects from corticosteroid-based creams used to treat certain skin diseases. Is too much artificial light at night making us sick?
Modern life, with its preponderance of inadequate exposure to natural light during the day and overexposure to artificial light at night, is not conducive to the body's natural sleep/wake cycle.UTSW neuroscientists identify cell type in the brain that controls body clock circadian rhythms
UT Southwestern Medical Center neuroscientists have identified key cells within the brain that are critical for determining circadian rhythms, the 24-hour processes that control sleep and wake cycles, as well as other important body functions such as hormone production, metabolism, and blood pressure.The 10-point guide to the integral management of menopausal health
Elsevier journal Maturitas, today announced the publication of a position statement by the European Menopause and Andropause Society (EMAS) covering the ten- point guide to the integral management of menopausal health.A breakfast of champions for diabetics
Our modern epidemic of obesity has led to an alarming rise in the incidence of diabetes. More than 382 million people on the planet suffer from diabetes, predominantly type-2 diabetes.
More Hormone Current Events and Hormone News Articles
The Hormone Reset Diet: Heal Your Metabolism to Lose Up to 15 Pounds in 21 Days|
by Sara Gottfried (Author)
The Harvard-educated physician and New York Times bestselling author of The Hormone Cure shows you how to grow new receptors for your seven metabolic hormones, making you lose weight and feel great fast!When it comes to weight loss, most people don’t think about hormones. But when you develop resistance to your seven major metabolic hormones—cortisol, thyroid, testosterone, growth hormone, leptin, insulin, and estrogen—your body adjusts by increasingly raising your hormone levels and ultimately slowing down your metabolism. And a slower metabolism leads to weight gain and difficulty losing weight. The solution, Dr. Sara Gottfried contends, is to reset the efficiency of your hormones by repairing and growing new hormone receptors.Based on leading scientific research, The Hormone...
The Supercharged Hormone Diet: A 30-Day Accelerated Plan to Lose Weight, Restore Metabolism & Feel Younger Longer|
by Natasha Turner (Author)
In this busy world, we want to lose weight sooner and faster. The Hormone Diet taught readers the ins and outs of how and why their hormones play the biggest part in their weight-loss woes. Now, in The Supercharged Hormone Diet, Dr. Natasha Turner gives readers the information they need to get their hormones back on track-in 30 days flat.
This highly praised plan addresses readers' most popular concerns in a fabulous, easy-to-follow program that includes:
- The Best Body Assessment for setting your goals
- The Hormonal Health Profile to identify fat-packing hormonal imbalances
- Recommended blood tests to take to your doctor
- Suggested supplements to aid fat burning and restore optimal health
- Hormone Diet-friendly food lists, weekly meal plans, and a...
Dr. John Lee's Hormone Balance Made Simple: The Essential How-to Guide to Symptoms, Dosage, Timing, and More|
by John R. Lee (Author), Virginia Hopkins (Author)
The authors of the classice books on menopause andpremenopause bring women an easy-to-use guide on balancing hormonelevels safely and naturally
Hormone Harmony: How to Balance Insulin, Cortisol, Thyroid, Estrogen, Progesterone and Testosterone To Live Your Best Life|
by Alicia Stanton (Author), Vera Tweed (Author)
Hormone Harmony addresses millions of women who are struggling with hormone imbalance, an epidemic that is disrupting countless lives during menopause and much earlier in life a widely unrecognized fact. It demystifies the subject of natural or bioidentical hormone therapy and debunks the myth that menopause is the primary trigger of midlife symptoms such as constant fatigue, lack of zest, sleep difficulties, mood swings, weight gain, loss of sex drive, forgetfulness, fuzzy thinking, and even hot flashes. In a friendly style, the book reveals the chief lifestyle triggers of hormonal havoc that are ignored in health care today; why six key hormones insulin, cortisol, thyroid, estrogen, progesterone and testosterone must be in balance; how to restore harmony by making practical lifestyle...
The Hormone Diet: A 3-Step Program to Help You Lose Weight, Gain Strength, and Live Younger Longer|
by Natasha Turner (Author)
Many of us experience signs and symptoms of hormonal imbalance every day. Do you have trouble dragging yourself out of bed in the morning? Ever have an uncontrollable sugar craving at 3 p.m.? Chronic headaches? Lack of energy? Do you get stressed just sitting in your office? Our bodies are wired to send us signals when something isn't right, but often we're too busy to hear them. Compounding the problem is a lack of understanding about the consequences if these symptoms are left unaddressed. Without hormonal balances, we are more likely to succumb to many diseases and illnesses.The Hormone Diet lays out a foolproof plan to balance your life, one hormone at a time. But it is more than just a diet book. Along with advice for weight loss, Dr. Natasha Turner provided recommendations for...
The Hormone Factory: A Novel|
by Saskia Goldschmidt (Author)
A disturbing story that describes how the alliance between science and capitalism can lead to disaster when the people in charge lose track of their humanity
Mordechai de Paauw was the Dutch cofounder and CEO of the first pharmaceutical company to invent the contraceptive pill and hormonal treatments. Hitler’s invasion of Holland and the threat he poses to the survival of De Paauw’s family and the Jewish scientists working for him doesn’t affect De Paauw’s urge to test his treatments on his female workers and exploit them sexually. Even after the war, which he survives unscathed, De Paauw will continue his mischief until a catastrophe that he himself couldn’t have imagined allows him to come to his senses long enough to tell us his story.
Hormones: Chemical Messengers|
by Choice PH
Hormones are the silent messengers that do their work unseen. They are vitally important in all phases of our life. In fact, there is no part of our existence that is not touched, in some way by hormones.
The remarkable part is they exercise their profound control and change with minute quantities that reach their target tissues via the bloodstream.
In this eBook, we highlight hormones of the endocrine system from the master gland, the Pituitary--and other hormones that regulate a variety of physiological and behavioral activities such as: digestion, metabolism, growth, sleep, reproduction, lactation, and stress; to name a few.
Hormone Reset Cookbook: 25 Quick & Easy Hormone Reset Recipes To Lose Up To 5 Pounds A Week|
Are you doing everything right?
Have you cleaned up your diet?
Are you exercising properly?
.....and you still can't lose those last few pounds?
IT'S VERY LIKELY THAT YOUR HORMONES ARE OUT OF SYNC!
This book gives you delicious recipes to aid you in your Hormonal Reset journey.
- Increased energy
- Improved skin quality
- Radical weight loss
Grab your copy today!
The Miraculous Results Of Extremely High Doses Of The Sunshine Hormone Vitamin D3 My Experiment With Huge Doses Of D3 From 25,000 To 50,000 To 100,000 Iu A Day Over A 1 Year Period|
by Jeff T Bowles (Author)
This updated edition has a fascinating new look at diabetes as an evolved defense to freezing damage in winter gone out of control- Don't miss it!
144+ Pages of
Fact-Packed Science Based Information-But FUN to read-
Upon realizing that taking 4,000 IU of Vitamin D3 a day was not enough for me, I decided to embark on a "dangerous" experiment that directly contradicted everything MD's had told me for years:
“DON'T TAKE TOO MUCH VITAMIN D IT IS DANGEROUS!”
I started taking 20,000 IU a day-50X times the recommended dose of 400 IU a day.
After about 4 months upped the dose to 50,000 IU a day or 150X the old recommended “safe” dose I then boosted it to 100,000 IU a day or 300 x TIMES the old maximum safe dose!
What happened over these...