scholarly journals Determination and comparison of caffeine and other chemical constituents in Coffea arabica varieties grown in Sri Lanka

2020 ◽  
Vol 49 (2) ◽  
pp. 151
Author(s):  
M.K. Jeewan ◽  
T. Liyanage ◽  
M.R. Roshana ◽  
T. Mahendran
2012 ◽  
Vol 4 (2) ◽  
pp. 92-102
Author(s):  
Senarathge R. Weerawardhena ◽  
Anthony P. Russell

Agriculture on the Indian sub-continent dates back to the fourth and third millennia BC, but only in more recent times did its intensity escalate in a major way. During the colonial era, the British established that the hilly areas of Sri Lanka were suitable for the rearing of coffee (Coffea arabica), for which much of the arable land of the island was extensively cultivated. Later, however, resulting from the severe impact of “Coffee Rust,” caused by the fungus Hemileia vastatrix, the coffee industry of Sri Lanka declined dramatically. Former coffee plantations were abandoned, but are still distinguishable as damaged areas. The truncation of coffee growing on the island created vacant room for another cash-crop.


Author(s):  
P. F. Cannon

Abstract A description is provided for Vizella gomphispora. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Vizella gomphispora was described from material on Symplocos spicata (Symplocaceae), from Sri Lanka. Other collections have been identified on Alstonia boonei (Apocynaceae), Chrysophyllum albidum (Sapotaceae), Coffea arabica, C. liberica and C. stenophylla (Rubiaceae), Conopharyngia longiflora (Apocynaceae), Craterispermum caudatum and C. laurinum (Rubiaceae), Cremaspora africana (Rubiaceae), Dendrophthora monstrosa (Viscaceae), Eugenia calophylloides (Myrtaceae), Ficus sp. (Moraceae), Funtumia elastica (Apocynaceae), Hoya sp. (Asclepiadaceae), Ilex denticulata (Aquifoliaceae), Ixora radiata (Rubiaceae), Macrolobium crassifolium (Leguminosae), Memecylon golaense (Melastomataceae), Nauclea sp. (Rubiaceae), Nectandra sp. (Lauraceae), Octoknema borealis (Olacaceae), Olax mannii (Olacaceae), Oxyanthus speciosus (Rubiaceae), Pavetta indica (Rubiaceae), Psychotria sp. (Rubiaceae), Soyauxia floribunda (Flacourtiaceae), Smeathmannia laevigata (Passifloraceae), Strychnos afzelii (Loganiaceae) and Tetrorchidium didymostemon (Euphorbiaceae). DISEASE: Occurring biotrophically on often symptomless living leaves. Its nutritional status is uncertain; perhaps the fungus obtains nutrients from cuticular waxes. Hughes (1953) suggested that the fungus may cause leaf spots, but it is more likely that it is either a secondary colonizer or survives necrotrophic damage by other agents. GEOGRAPHICAL DISTRIBUTION: pantropical; known from Brazil, Ghana, India, Jamaica, Kenya, New Guinea, Sierra Leone, Sri Lanka, Trinidad and Uganda. Collections identified as V. gomphispora from Australia (Queensland) and Zambia are present in IMI but probably belong to different species. TRANSMISSION: no studies have been made, but ascospores and their fragmented segments are almost certainly wind- or watersplash-dispersed, depending on local climatic conditions at the time of ascus maturity.


2022 ◽  
Vol 284 ◽  
pp. 114778
Author(s):  
Rafaela Cunha Matosinhos ◽  
Juliana Pantaleão Bezerra ◽  
Camila Helena Barros ◽  
Ana Catharina Fernandes Pereira Ferreira Bernardes ◽  
Grazielle Brandão Coelho ◽  
...  

Author(s):  

Abstract A new distribution map is provided for Xylotretrechus quadripes Chevrolat Coleoptera: Cerambycidae Attacks coffee (particularly Coffea arabica). Information is given on the geographical distribution in ASIA, Bangladesh, Cambodia, China, Fujian, Guangdong, Guangxi, Hainan, Hunan, Yunnan, India, Arunachal Pradesh, Assam, Karnataka, Madhya Pradesh, Maharashtra, Tamil Nadu, West Bengal, Indonesia, Java, Lao, Myanmar, Philippines, Sri Lanka, Taiwan, Thailand, Vietnam.


1992 ◽  
Vol 55 (9) ◽  
pp. 1261-1269 ◽  
Author(s):  
E. M. Kithsiri Wijeratne ◽  
B. M. Ratnayake Bandara ◽  
A. A. Leslie Gunatilaka ◽  
Yasuhiro Tezuka ◽  
Tohru Kikuchi

Author(s):  
Jan Zarzycki ◽  
Joseph Szroeder

The mammary gland ultrastructure in various functional states is the object of our investigations. The material prepared for electron microscopic examination by the conventional chemical methods has several limitations, the most important are the protein denaturation processes and the loss of large amounts of chemical constituents from the cells. In relevance to this,one can't be sure about a degree the observed images are adequate to the realy ultrastructure of a living cell. To avoid the disadvantages of the chemical preparation methods,some autors worked out alternative physical methods based on tissue freezing / freeze-drying, freeze-substitution, freeze-eatching techniqs/; actually the technique of cryoultraraicrotomy,i,e.cutting ultrathin sections from deep frozen specimens is assented as a complete alternative method. According to the limitations of the routine plastic embbeding methods we were interested to analize the mammary gland ultrastructure during lactation by the cryoultramicrotomy method.


Author(s):  
R. J. Narconis ◽  
G. L. Johnson

Analysis of the constituents of renal and biliary calculi may be of help in the management of patients with calculous disease. Several methods of analysis are available for identifying these constituents. Most common are chemical methods, optical crystallography, x-ray diffraction, and infrared spectroscopy. The application of a SEM with x-ray analysis capabilities should be considered as an additional alternative.A scanning electron microscope equipped with an x-ray “mapping” attachment offers an additional dimension in its ability to locate elemental constituents geographically, and thus, provide a clue in determination of possible metabolic etiology in calculus formation. The ability of this method to give an undisturbed view of adjacent layers of elements in their natural state is of advantage in determining the sequence of formation of subsequent layers of chemical constituents.


2015 ◽  
Vol 21 ◽  
pp. 114-115
Author(s):  
Kavinga Gunawardane ◽  
Noel Somasundaram ◽  
Neil Thalagala ◽  
Pubudu Chulasiri ◽  
Sudath Fernando

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