Wednesday, 25 February 2015

Hampir semua jenis teh ternyata berperan besar terhadap kebugaran dan kesehatan peminumnya. Para ahli yang meneliti daun teh sepakat, teh mengandung senyawa-senyawa bermanfaat seperti polifenol, theofilin, flavonoid/metixantin, tanin, vitamin C dan E, catechin, serta sejumlah mineral seperti Zn, Se, Mo, Ge, Mg. Semua itu tidak hanya berkhasiat bagi tubuh sebagai zat antimutagenik dan antikanker, mengobati gangguan saluran pencernaan, serta membantu menetralkan lemak dalam makanan, tetapi juga mencegah oksidasi lemak densitas rendah yang bisa menjadi plak, menurunkan kolesterol darah, menyegarkan pernapasan, dan merangsang batang otak.
Zat flavonoid yang ada dalam daun teh, memang berfungsi sebagai penangkal radikal bebas yang mengacaukan keseimbangan tubuh dan menjadi salah satu pemicu kanker. Selain itu kehadiran polifenol, theofilin, dan senyawa lainnya di daun teh membantu menghambat perkembangan virus ataupun kelainan faat yang menimbulkan kanker [1].

Teh yang dipakai dalam pembuatan “bubble tea instant” ini adalah teh hijau yang dikenal memiliki khasiat sebagai anti-kanker. Di samping bisa mencegah kanker, teh hijau dipercaya bisa pula mencegah berbagai penyakit seperti menghambat terbentuknya kolesterol darah, mengontrol tekanan darah tinggi, menurunkan kadar gula darah, memperlambat penuaan, dan menyegarkan badan. Catechin dalam teh hijau terbukti untuk menghambat tekanan darah tinggi [2]. Daun teh yang dijadikan teh hijau biasanya langsung diproses setelah dipetik. Setelah daun mengalami oksidasi dalam jumlah minimal, proses oksidasi dihentikan dengan pemanasan (cara tradisional Jepang dengan menggunakan uap atau cara tradisional Tiongkok dengan menggongseng di atas wajan panas). Teh yang sudah dikeringkan bisa dijual dalam bentuk lembaran daun teh atau digulung rapat berbentuk seperti bola-bola kecil (teh yang disebut gun powder).

Friday, 6 February 2015

Chemical Reaction Engineering Octave Levenspiel

Chemical Reaction Engineering, Third Edition helps students learn how to answer reactor design questions reliably and effectively. To accomplish this, the text emphasizes qualitative arguments, simple design methods, graphical procedures, and frequent comparison of capabilities of major reactor types. This approach helps students develop a strong intuitive sense for good design.

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Wednesday, 4 February 2015

Perry's Chemical Engineers' Handbook
(also known as Perry's Handbook or Perry's) was first published in 1934 and the most current eighth The subjects covered in the book include: physical properties of chemicals and other materials; mathematics; thermodynamics; heat transfer; mass transfer; fluid dynamics; chemical reactors and chemical reaction kinetics; transport and storage of fluid; heat transfer equipment; psychrometry and evaporative cooling; distillation; gas absorption; liquid-liquid extraction; adsorption and ion exchange; gas–solid, liquid–solid and solid–solid operations; biochemical engineering; waste management, materials of construction, process economics and cost estimation; process safety and many others. An electronic version of his reference book is provided by Knovel. The first edition was edited by John H. Perry who was a PhD physical chemist and chemical engineer for E. I. du Pont de Nemours & Co. W. S. Calcott (ChE) of DuPont was his assistant editor. It was published in 1934. The second edition was published in 1941. The third edition was edited by John H. Perry and published in 1950 The fourth edition was edited by Robert H. Perry, Cecil H. Chilton, and Sidney D. Kirkpatrick and published in 1963. The fifth edition was edited by Robert H. Perry and published in 1973. The sixth edition was published in 1984 and edited by Robert H. Perry and Donald W. Green. The 1997 seventh edition was edited by Robert H. Perry and Donald W. Green. The 2007/2008 eighth edition was edited by Don W. Green and Robert H. Perry.
(Wikipedia.org)

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Monday, 2 February 2015

Encyclopedia of Nanoscience and Nanotechnology
This 25-volume encyclopedia contains over seven-hundred state-of-the-art review chapters organized 
in an A-Z format to provide a complete coverage of advanced research in all nanotechnology related 
fields such as chemistry, physics, engineering and medical sciences. The review chapters are 
contributed by over 2,000 of the world's leading scientists from top-notch academic and industrial 
institutions worldwide. This 25-volume encyclopedia now contains 710 articles, 150,000 
bibliographic citations and thousands of illustrations, figures, tables, and equations covering 
ca 22,000 pages which hundreds of images/figures/illustrations in color. The 25-volume set contains
 the largest number of state-of-the-art review chapters ever published in the world in the field of 
nanotechnology. Each chapter is fully cross-referenced, introducing some of the most important 
nanotechnologies under development today. The first edition of the Encyclopedia of Nanoscience
 and Nanotechnology, 10-Volume Set, (Edited by H. S. Nalwa, Foreword by Professor Richard E. Smalley, 
Nobel Prize Laureate, Endorsed by Professor Jean-Marie Lehn, Nobel Prize Laureate) that 
appeared in 2004 received the "Best Reference Work Award" of the American Society for Engineering
 Education (USA) and "Outstanding Academic Title" by the CHOICE magazine from the American 
Library Association (USA). With the addition of new 15 volumes (vols. 11-25) in 2011, the entire 
25-volume set contains the largest number of articles ever published in the field of nanotechnology 
in the world. There is no match for this landmark reference since this encyclopedia covers all 
research topics reported over the past two decades. It is the most useful reference for all academic 
and research libraries.

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