Artikel (tulisan) "Teh Minuman Kesehatan"

Teh Minuman Kesehatan

Teh merupakan tanaman daerah tropis dan subtropis yang secara ilmiah dikenal dengan Camellia Sinensis. Dari kurang lebih 3000 jenis teh hasil perkawinan silang, didapatkan 3 macam teh hasil proses, yaitu teh hijau, teh oolong, dan teh hitam. Cara pengolahan teh yaitu dengan merajang daun teh dan dijemur di bawah sinar matahari sehingga mengalami perubahan kimiawi sebelum dikeringkan. Perlakuan tersebut akan menyebabkan warna daun menjadi coklat dan memberi cita rasa teh hitam yang khas.

Teh hijau, jenis teh tertua, amat disukai terutama oleh masyarakat Jepang dan Cina. Di sini daun teh mengalami sedikit proses pengolahan, hanya pemanasan dan pengeringan sehingga warna hijau daun dapat dipertahankan. Sedangkan teh oolong lebih merupakan jenis peralihan antara teh hitam dan teh hijau. Ketiga jenis teh masing-masing memiliki khasiat kesehatan karena mengandung ikatan biokimia yang disebut polyfenol, termasuk di dalamnya flavonoid. Flavonoid merupakan suatu kelompok antioksidan yang secara alamiah ada di dalam sayur-sayuran, buah-buahan, dan minuman seperti teh dan anggur.

Subklas polifenol meliputi flavonol, flavon, flavanon, antosianidin, katekin, dan biflavan. Turunan dari katekin seperti epi-cathecin (EC), epigallo-cathecin (EGC), epigallo-cathecin gallate (EGCg), dan quercetin umumnya ditemukan di dalam teh. EGCg dan quercetin merupakan anti oksidan kuat dengan kekuatan hingga 4-5 kali lebih tinggi dibandingkan vitamin E dan C yang juga merupakan antioksidan potensial. Antioksidan diketahui mampu menghindarkan sel dari kerusakan mengingat setiap kerusakan sel akan menyumbang lebih dari 50 penyakit.

Teh hijau mengandung EGCg, demikian juga teh hitam, demikian dikatakan seorang ahli biokimia. Dalam sebuah studi yang dilakukan peneliti Belanda menyebutkan, mengkonsumsi 4-5 cangkir teh hitam setiap hari akan menurunkan resiko stroke hingga 70% dibanding dengan mereka yang mengkonsumsi teh 2 cangkir sehari atau kurang. Laporan lainnya menyebutkan lebih banyak mengkonsumsi teh hitam berhubungan dengan rendahnya kasus serangan jantung. John Folts, Direktur Sekolah Medis, Pusat Penelitian dan Pencegahan Arteri Trombosis, Universitas Wisconsin, AS menemukan kunci khasiat dalam teh yaitu flavonoid. Hasil penelitiannya menunjukkan, flavonoid dalam teh hitam mampu menghambat penggumpalan sel-sel platelet darah sehingga mencegah penyumbatan pembuluh darah pada penyakit hantung koroner dan stroke. Studi lain menyebutkan bahwa peminum teh fanatik memiliki kadar kolesterol dan tekanan darah yang rendah, meskipun masih belum jelas apakah semuanya itu langsung disebabkan karena teh.

Para peneliti di Universitas Case Western Reserve, Cleveland, AS menemukan pengaruh penggunaan teh hijau pada kulit hingga 90 %. Ternyata teh sangat efektif melindungi kulit dari sinar matahari yang dapat mengakibatkan kanker kulit. Teh juga diketahui mengandung fluoride yang dapat menguatkan email gigi dan membantu mencegah kerusakan gigi. Dalam suatu studi laboratorium di Jepang, para ahli menemukan bahwa teh membantu mencegah pembentukan plak gigi dan membunuh bakteri mulut penyebab pembengkakan gusi.

Penelitian di Jepang menunjukkan, daerah penghasil teh yang pendudukanya terkenal sebagai peminum teh fanatik, sangat rendah angka kematiannya yang disebabkan oleh kanker. Hasil studi lainnya, dilakukan kerjasama antara tim peneliti Oguni dan pusat penelitian kanker di Beijing untuk mempelajari pengaruh ekstrak teh hijau pada tikus yang telah diberi ransum makanan karsinogenik (zat pemicu kanker). Dilaporkan, angka rata-rata kanker pada tikus yang memperoleh ekstrak teh hijau setengah dari tikus yang tidak memperoleh ekstrak teh hijau.

Para peneliti yakin bahwa polifenol yang dikenal sebagai cathecin yang terdapat pada teh hijau, membantu tubuh manusia melawan sel kanker. Studi lainnya dilakukan oleh Oguni dan Dr. Masami Yamada dari Hamamatsu Medical Center menemukan cathecin membunuh Helicobator pylori, bakteri pemicu kanker lambung. 

Comment :

Tea is actually good for our bodies when we consume them with rules that the correct amount of drinking every day. The benefits of tea are many, including preventing gastric cancer, in addition to being a drug of tea can relieve our thirst after activity. As explained in the article which is that tea has many different kinds of benefits that exists at each other, quercetin is a powerful antioxidant with the power of up to 4-5 times higher than vitamin E and C which also are potent antioxidants. Antioxidants are known to prevent cells from damage since each cell damage will contribute more than 50 diseases. That is one of the benefits of tea have anti-oxidants which eminence.

Tugas softskill 3 "bahasa inggris bisnis"

Leonardo da Vinci was born on Apr il 15, 1452 in Vinci, Italy.  He was the illegitimate son of Ser Piero, a Florentine notary and landlord, but lived o n the estate and was treated as a legitimate son.

In 1483, Leonardo da Vinci drew the first model of a helico pter. It did not look very much like our modern day “copter,” but the idea of what it could do was about the same.

Leonardo was an artist and sculptor. He was very interested in motion and movement and tried to show it in his art. In order to show movement, he found it helpful to study the way things moved. One subject he liked to study was birds and how they flew. He spent many hours watching the birds and examining the structure of their wings. He noticed how they cupped air with their wings and how the feathers helped hold the air. Through these studies, Leonardo began to understand how birds were able to fly.

Like many other men, Leonardo began to dream of the day when people would be able to fly. He designed a machine that used all the things he had learned about flight, and thus became the first model of a helicopter.

Poor Leonardo had only one problem, however.  He had no way to give the necessary speed to his invention. You see, motors had not yet been invented and speed was an important part of the flying process. It would be another four hundred years before the engine was invented and another fifty years before it was put to the test in an airplane. Leonardo’s dream of a helicopter finally came to pass in 1936.

The Italian painter, sculptor, architect, engineer, and scientist, Leonardo died on May 2, 1519, and was buried in the cloister of San Fio rentino in Amboise.

1.  What is the author’s main point?
a. The invention of the helicopter.
b. Birds cup air with their wings and use feathers to help hold the air.
c. An overview of one of Leonardo da Vinci’s many skills.
d. Leonardo da Vinci was born in 1452 and died in 1519.

2.  The word problem in paragraph five could best be replaced by the word:
a. dilemma
b. mistake
c. danger
d. pain

3.  The word it in paragraph two refers to:
a. Leonardo da Vinci
b. The first model helicopter
c. 1483
d. motion and movement

4. Which paragraph explains why Leonardo ’s helicopter was not successful in his lifetime:
a. paragraph 1
b. paragraph 2
c. paragraph 4
d. paragraph 5

5. The word illegitimate in paragraph one is closest in meaning to:
a. against the law or illegal
b. not in correct usage
c. incorrectly deduced; illogical
d.  born out of wedlock

6. The fo llowing sentence would best complete which paragraph? “Since then people have been living out Leonardo’s dream of flying.”
a. paragraph 3
b. paragraph 4
c. paragraph 5
d. paragraph 2

7. What was the main problem with Leonardo ’s invention?
a. motors were not yet invented
b. the birds lost their feathers
c. he was illegitimate
d. he couldn’t draw

8. The word they in the third paragraph refers to:
a. the feathers
b. the birds
c. the studies
d. the wings

9. In what year was the first helicopter flown
a. 1483
b. 1452
c. 1519
d. 1936

10. What two things did birds have that Leonardo da Vinci noticed helped them to
fly?
a. wings and beaks
b. feathers and talons
c. wings and feathers
d. cups and feathers

sumber : lintasterbaru.com/contoh-soal-toefl-latihan-tes-toefl.html