A Chemical Investigation of Roman Pigments from a Shop in the ...

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A Chemical Investigation of Roman Pigments from a Shop in the Area Sacra di San Omobono, Rome Ruth Beeston, Davidson College, Department of Chemistry 5 10 15 20 25 - keV - 0.0 0.5 1.0 1.5 2.0 x 1E3 Pulses Cu K Ca Ti Mn Fe Rb Sn Sn Sb Sb Pb Sr Pd Pd Rh Rh This presentation will describe the use of portable X-Ray Fluorescence spectroscopy to investigate the elemental composition of raw pigments from a 3rd century AD pigment shop at S. Omobono.

• essential part of the ancient painter
• ancient painting studies stephanie
• mn fe rb sn sn sb sb pb sr pd pd rh rh
• ancient roman
• painting

Sujets

• Exposé
• Fluorescence
• Yale University
• Gallery
• Painting
• Ancient
• Essential
• Study
• Stéphanie

Informations

• Publié par: vien0
• Nombre de lectures: 22
• Langue: English

Extrait

Tropical Horticulture: Lecture 28

Lecture 28 Other Tropical Starch Crops

Sweet potato:Ipomoea batatas,Convolvulaceae

Sweet potato:Ipomoea batatas,Convolvulaceae

New World Origin, has become naturalized in the Pacific. One theory is that it was carried by Polynesian travelers from Easter Island, but more likely it came from the Philippines where it was introduced by the Spanish conquistadors. Adapted to tropical lowlands and an important food in Asia. In tropics most cultivars are white fleshed. Has now has become an important temperate crop.

Continent World Africa

Sweet Potato Production (2001)

North America South America

Asia

Europe Oceania

1000 tonnes Chief countries 135,919 10,203 Uganda (2,515), Nigeria (2,468), Rwanda (1,137) 1,158 US (651), Cuba (200), Haiti (174) 1,250 Brazil (485), Argentina (335), Peru (273) 122,645 China (115,122), Indonesia (1,686), Viet Nam (1,610) 59 Portugal (22), Spain (21), Italy (14) 602 Papua New Guinea (485), Solomon (79), New Zealand (16)

1

Tropical Horticulture: Lecture 28

Morphology of the sweetpotato plant

Sweetpotato in Indonesia

2

Tropical Horticulture: Lecture 28

Potato:Solanum tuberosum,Solanaceae

Also known incorrectly asIrish potato(but is not from Ireland) andwhite potato(but there are yellow and red types). A tropical highland crop but now the most important temperate tuber vegetable. Still grown in tropical highlands. Crop is very sensitive to daylength. S. tuberosum(4x, a tetraploid) tubers in short days and long days = a long day selection of S. andiginum) S. andiginum(4x); tubers only in short days S. demissum(6x); small and colorful potatoes of Peru S. phureja(2x) S. stenotomum(2x)

Continent World Africa

North America

South America

Asia

Europe

Oceania

Potato Production (2001)

1000 tonnes 308,195 11,776

26,646

13,902

118,280

135,839

1,753

Chief countries

Malawi (2,000), Egypt (1,800), South Africa (1,555) US (20,174), Canada (4,030), Mexico (1,610) Colombia (3,013), Peru (2,799), Brazil (2,787) China (64,045), India (25,000), Turkey (5,350) Russian Federation (34,500), Poland (20,401), Ukraine (13,500) Australia (1,250), New Zealand (500), New Caledonia (1)

3

Tropical Horticulture: Lecture 28

. Plant and flowers of potato

The potato tuber is an underground stem. The eyes are buds.

Potato blight

4

Tropical Horticulture: Lecture 28

Minor Peruvian Root Crops

Inca crops in a market in Ipiales, Colombia

Collection of Peruvian Root Crops

Ulluco Ullucus tuberosus

5

Tropical Horticulture: Lecture 28

Oca,Oxalis tuberosus

Palms and Cycads

The stems of Cycads and Palms are a source of carbohydrates inside the stem. They are harvested by cutting down the tree and scraping the stem.

Sago:Metroxylon sagu, Palmaceae An enormous palm, originated in Malaysia. Grows 10 to 15 years before it flowers, during this period it accumulates starch. It is not widespread but found now in New Guinea.

6

Tropical Horticulture: Lecture 28

Female

Cycad cone

Cycads

Male

7