Manusia Bisa Melihat Medan Magnet

Tanpa disadari, manusia sebenarnya bisa melihat medan magnet bumi karena adanya suatu senyawa dalam mata. Ada kemungkinan, nenek moyang manusia dulu punya kemampuan tersebut. Sebuah studi menunjukkan bahwa ada kemungkinan protein bernama cryptochrome terdapat pada retina. Protein tersebut banyak didapati pada hewan dan tumbuhan sehingga beberapa spesies bisa menggunakan medan magnet bumi untuk melakukan navigasi.

Cryptochrome

Elektron dalam molekul cryptochrome saling terkait. Medan magnet bumi menyebabkan elektron bergoyang. Reaksi kimiawi untuk merespons goyangnya elektron tersebut membuat burung dapat melihat medan maget dalam warna-warni. Para peneliti sebelumnya mengira cryptochrome tidak memiliki banyak keuntungan bagi manusia sehingga tidak dapat mengenali medan magnet seperti burung. Karenanya, manusia butuh patokan atau perangkat GPS untuk mengetahui arah.

Sangkaan ini yang sepertinya harus diubah setelah para ahli saraf dari University of Massachusetts melakukan penelitian. Mereka mengambil cryptochrome dari manusia dan memberikannya pada lalat buah yang kehilangan kemampuan melihat medan magnet. Hasilnya, seperti dilaporkan Wired Science, lalat buah kembali memiliki kemampuan melihat medan magnet. Sayangnya pada manusia, cara kerja cryptochrome tidak seperti pada lalat. "Kami tidak tahu apakah kerja molekul itu sama pada retina manusia. Tapi kemungkinan itu ada," kata Steven Reppert, ahli saraf dari University of Massachusetts.

Saat ini ilmuwan mengetahui bahwa cryptochrome pada manusia berfungsi sebagai jam molekul, bukan sebagai kompas. Tapi para peneliti menduga bahwa nenek moyang manusia terbantu dengan adanya protein tersebut untuk menentukan arah. Jika suatu saat para peneliti berhasil mengembalikan kemampuan tersebut... selamat tinggal perangkat GPS.

sumber:http://www.forumsains.com/artikel/manusia-bisa-melihat-medan-magnet/?PHPSESSID=7bbfjjs6v8leqof4sk5ef97l67

Smoking causes asthma in second generation offspring, study shows

Smoking causes asthma in second generation offspring, study shows

benefit of lemon

Health Benefits of Lemon

             Just looking at bright yellow lemons hanging from a tree makes you think, "Those must be good for you!" You can trust your instinctive attraction to lemons: they are good for you. In fact, lemons have many more health benefits than you may realise.
                                                      

              While lemons, like other citrus fruits, contain vitamin C and other antioxidants, their sour taste doesn't make them the best choice for getting your full daily allowance of vitamin C. However, lemons have some properties that make them superior to their cousins in a variety of applications, both when applied topically and taken internally.

Some of the topical treatments you can use lemons for include:

·         Wart busting: Warts are caused by a viral infection. An effective way to get rid of warts is to make a paste out of a mixture of crushed vitamin C tablets and lemon juice. Apply as a poultice directly to the wart and cover with a bandaid. To protect the surrounding skin, dab a little petroleum jelly around the circumference of the wart.

·         Natural pimple treatment: The high acidic content of lemons removes dead skin that clogs pores.

·         Oily hair treatment: If you have unusually oily hair, try squeezing the juice of a lemon into a glass of water and using it as a final rinse.

·         Deodorant: Before commercial deodorants took centre stage, lemon juice was used as a natural underarm deodorant. It works by fighting the bacteria that cause underarm odour and making the pH balance more acidic.

·         A time-tested way to fade age spots is to apply lemon juice to them twice a day. The juice acts as a mild bleach and the acid in lemons removes dead skin.

Taken internally, lemons provide many benefits:

·         The old lemon juice in warm water tonic for colds and flus really works. Not only does the vitamin C help boost the immune system, lemon juice contains natural antihistamines. Histamine is the chemical that causes inflammation, a stuffy nose and watery eyes.

·         A glass of hot water with lemon juice in the morning is a great way to improve digestion, treat constipation and even help prevent the formation of kidney stones.

·         Recent studies have shown that limonene, a chemical found in lemon rind, inhibits the growth of breast cancer cells in laboratory studies. Although not yet tested on humans, it shows promise for the future.

·         Another study showed that people who regularly drank black tea with lemon contracted skin cancer less frequently than those who did not. Researchers believe this may be because lemon activates an enzyme called glutathione, a known natural cancer fighter.

·         High in potassium, lemon juice may be a good way to help fight high blood pressure.

Any way you take it, lemon has health benefits. Their bright yellow rind and fresh scent is just one more reason to put lemons on display in your fresh fruit bowl. For that matter, you may even want to plant a lemon tree in your back yard and enjoy your own fresh lemons when they are in season.

source: http://www.naturaltherapypages.com.au/article/the_health_benefits_of_lemon#ixzz2A0rYePcN