Plant Succession and Plant Distribution in South Africa

Indigenous Plant Genetic Resources of South Africa

South Africa is considered to be a “hotspot” for biodiversity and more than 22,000 plant species occur within its boundaries. This represents 10% of the world’s species, although the land surface of South Africa is less than 1% of the earth. The country is divided into seven biomes and into 68 vegetation types (Low and Rebelo 1996). The Savanna biome covers 33% of the surface of the country, bu...

Plant poisonings in livestock in Brazil and South Africa.

Information on intoxication of livestock by plants in Brazil, in terms of cause, clinical signs and pathology, is compared with information on livestock poisoning by plants in South Africa. Plant poisoning, including mycotoxicosis, is considered to be one of three major causes of death in livestock in Brazil, which is one of the top beef producing countries in the world, with a cattle populatio...

Early Plant Succession in Abandoned Pastures in Ecuador

We compared early plant succession in four abandoned pastures of differing age since abandonment and a nearby secondary forest site in northwestern Ecuador. Two "Open" pastures had no tree canopy covering, and two "Guava" pastures had a well-developed canopy cover of Psidium guajaua. No site had been seeded with pasture grasses. All pastures were compared in a chronological sequence; nvo were m...

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...

A Seventeen-Year Study of Plant Succession in Prairie