The Beginnings of Plant Hybridization

Plant Systematics: Beginnings and Endings

The Beginnings of Astrobiology

With the present surge of interest in astrobiology and its emergence as a new scientific discipline in its own right, the role of a celebrated pioneer is all too often forgotten. There can be little doubt that the late Sir Fred Hoyle played a key part in relating astronomical phenomena to questions of life. One of his first contributions in this area was his introduction of the so-called anthro...

extraction and characterization of allium irancum plant extract and its application in the green synthesis of silver nano particles and oxidation of thiocarbony1 compounds

سنتز سبز نانوذرات فلزی (nps) درسالهای اخیر توجه بسیارزیادی را به خود جلب کرده است. زیرا این پروتوکل کم هزینه وسازگار با محیط زیست از روش های استاندارد سنتز. در این پایان نامه ما گزارش میکنیم یک روش ساده و سازگار با محیط زیست برای سنتز نانوذرات نقره با استفاده از محلول آبی عصاره گیاه allium iranicum به عنوان یک عامل کاهش دهنده ی طبیعی. نانو ذرات نقره مشخص شد با استفاده از تکنیک های uv-visible، x...

The beginnings of an endocrinologist.

During my graduate studies I never had courses in endocrinology and pharmacology. Expressions such as “dose-response, ” “desensitization,” “agonist/antagonist,” in fact, all expressions relating to physiology were alien to my ears. I was a biochemist bred to believe in the reductionist philosophy of science, still much in vogue today. Grind, extract, purify, and reconstruct were the keys words ...

The Beginnings of Indwstrialization

It may seem curious to speak of industrialization as beginning around 1500. Industrialization is often regarded as synonymous with the rise of mechanized manufacturing in centralized facrories, and this did nor occur even in England unti l 1760-80, and in Germany not unti l 1830-50. But machines and factories were only late landmarks albeit important ones in a much longer process of industrial ...