Science Current Events | Science News | Brightsurf.com
 

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 Articles


Scientists unveil prostate cancer's 'Rosetta Stone'
Almost 90 per cent of men with advanced prostate cancer carry genetic mutations in their tumours that could be targeted by either existing or new cancer drugs, a landmark new study reveals.

The dark side of the 'love hormone'; similarities with the effects of alcohol
Researchers at the University of Birmingham have highlighted significant similarities between the behavioural effects of oxytocin and alcohol.

Bigger capsules may be long-sought key for transplanting islet cells
Changing the size of cell-carrying spheres may surmount the difficulties that have bedeviled diabetes researchers trying to ferry insulin-producing islet cells into hosts as a way to treat type 1 diabetes.

UC-led obesity research finds leptin hormone isn't the overeating culprit
For years, scientists have pointed to leptin resistance as a possible cause of obesity. Research led by investigators at the University of Cincinnati (UC) Metabolic Diseases Institute, however, found that leptin action isn't the culprit.

Atmospheric release of BPA may reach nearby waterways
Water contamination by hormone-disrupting pollutants is threatening water quality around the world. Existing research has determined that harmful concentrations of Bisphenol-A (BPA), a chemical used in consumer products such as plastic food storage and beverage containers, have been deposited directly into rivers and streams by municipal or industrial wastewater.

The life and death of beta cells
Diabetes is one of the scourges of modern society, and the number of cases is rising every year. Already, there are over 380 million diabetics around the world.

A blood test for early detection of breast cancer metastasis
The chances of being cured of breast cancer have increased in recent decades, however if the tumour has metastasised, the disease remains essentially incurable. One reason for this could be that the metastases are detected late, after they have grown enough to cause symptoms or be seen on a radiological scan.

New cancer treatment and prevention studies signal major advances for children and adults
The American Society of Clinical Oncology (ASCO) today announced results from four major studies to be presented at ASCO's 51st Annual Meeting, May 29-June 2, in Chicago.

Moffitt researchers say androgen deprivation therapy may lead to cognitive impairment
Cognitive impairment can occur in cancer patients who are treated with a variety of therapies, including radiation therapy, hormone therapy, and chemotherapy.

Potential obesity treatment targets the 2 sides of appetite: Hunger and feeling full
Our bodies' hormones work together to tell us when to eat and when to stop. But for many people who are obese, this system is off-balance. Now scientists have designed a hormone-like compound to suppress hunger and boost satiety, or a full feeling, at the same time.
More Hormone Current Events and Hormone News Articles

The Hormone Reset Diet: Heal Your Metabolism to Lose Up to 15 Pounds in 21 Days

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 Hormone Secret: Discover Effortless Weight Loss and Renewed Energy in Just 30 Days

The Hormone Secret: Discover Effortless Weight Loss and Renewed Energy in Just 30 Days
by Dr. Tami Meraglia (Author), Daniel Amen (Foreword)


From an expert in integrative medicine, a thirty-day plan to help women lose weight and look and feel years younger.

As they grow older, many women struggle to lose weight. Unlike many men their age, they may also suffer from sleep problems, osteoporosis, and depression. Many women may even feel like they age less slowly and gracefully than their male counterparts.

Dr. Tami Meraglia knows that the magic word here is testosterone. While there is ample discussion in the medical community about the effects of estrogen loss, few people are aware of the importance of sufficient testosterone levels in women. A healthy dosage helps women slim down, improves their mood, lowers the risk of cardiac disease, increases energy and libido, prevents osteoporosis, enhances skin tone and...

Hormones: Chemical Messengers

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.

The Hormone Diet: A 3-Step Program to Help You Lose Weight, Gain Strength, and Live Younger Longer

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...

Dr. John Lee's Hormone Balance Made Simple: The Essential How-to Guide to Symptoms, Dosage, Timing, and More

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

Natural Hormone Balance for Women: Look Younger, Feel Stronger, and Live Life with Exuberance

Natural Hormone Balance for Women: Look Younger, Feel Stronger, and Live Life with Exuberance
by Uzzi Reiss (Author), Martin Zucker (Author)


A pioneering gynecologist and antiaging specialist with a successful Beverly Hills practice, Dr. Uzzi Reiss shows the way for women who want to turn back the effects of time through natural hormone therapy, but who wonder: is it safe? Does it work? Is hormone therapy right for me?

Natural Hormone Balance for Women is Dr. Reiss's breakthrough, step-by-step program for women who want to take control of their lives by restoring hormonal balance. This revolutionary, commonsense natural hormone replacement program is designed to meet the individual needs of most women looking to rejuvenate body and mind—and offers astounding benefits for women of all ages:

More energy and stamina * Improved memory * Healthier, more youthful skin * Balanced moods * Less depression and anxiety...

Hormone Reset Diet: 30+ Breakfast to Dessert Recipes to Boost Metabolism, Balance Hormones, and Lose Weight Fast+**FREE BONUS Included** (Hormone Reset ... Cure, Hormone Cookbook, Hormone Recipes)

Hormone Reset Diet: 30+ Breakfast to Dessert Recipes to Boost Metabolism, Balance Hormones, and Lose Weight Fast+**FREE BONUS Included** (Hormone Reset ... Cure, Hormone Cookbook, Hormone Recipes)


Your Ultimate Hormone Diet Cookbook to Losing Weight Fast!!!
***FREE BONUS Included- Download Now For Instant Access***

Today only, get this Amazon bestseller for just $3.99. Regularly priced at $6.99. Read on your PC, Mac, smart phone, tablet or Kindle device.

This book is made to support those who are practicing the diet and are having a confusion or problem with their meal plans. You want recipes and less chit-chat? This book has exactly what you need!

This ultimate cookbook is packed with recipes that will take care of your breakfast, lunch, dinner, snacks, and dessert. The recipes aren’t also just another health-promising recipes. They are also made to please your taste buds. Imagine meat, seafood, omelette, pudding, gelatin, smoothies,...

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

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...

Hormone Reset Diet: Proven Tips and Delicious Recipes to Balance Hormones, Heal Metabolism and Lose Weight (Weight Loss Diet Plan)

Hormone Reset Diet: Proven Tips and Delicious Recipes to Balance Hormones, Heal Metabolism and Lose Weight (Weight Loss Diet Plan)


Do You Know the Role Hormones Play in Your Metabolism and Health?

Have you tried many of the popular diets that are available on the market today but found that they left you unsatisfied, hungry or tired?

Have you tried quick fix diets that seemed to work at first, but gained back all of the weight you lost immediately after resuming your normal eating habits?

Are you frustrated with the amount of money you've spent on diets, cookbooks, shakes, protein bars, and meals, only to see zero results?

Do you feel tired and bloated? Do digestive issues constantly plague you?

If you answered yes to any or all of these questions, keep reading.

With all of the fad diets on the market today, it can be difficult to find...

© 2015 BrightSurf.com