Characteristics of the radiation fields from lightning in Sri Lanka in the tropics

1985 ◽  
Vol 90 (D4) ◽  
pp. 6099 ◽  
Author(s):  
Vernon Cooray ◽  
Stig Lundquist
Keyword(s):  
Sri Lanka ◽  
Radiation Fields ◽  
The Tropics

Urban shading-a design option for the tropics? A study in Colombo, Sri Lanka

2007 ◽  
Vol 27 (14) ◽  
pp. 1995-2004 ◽  
Author(s):  
R. Emmanuel ◽  
H. Rosenlund ◽  
E. Johansson
Keyword(s):  
Sri Lanka ◽  
Design Option ◽  
The Tropics

scholarly journals Species Composition and Visiting Frequencies of Flower Visitors ofChromolaena odoratain a Dry Zone Forest Patch of Sri Lanka

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
D. G. R. M. M. Kaushalya Rathnayake ◽  
W. M. G. Asanga S. T. B. Wijetunga
Keyword(s):  
Sri Lanka ◽  
Plant Species ◽  
Invasive Plant ◽  
Secondary Forest ◽  
Major Theme ◽  
Forest Patch ◽  
Flower Visitors ◽  
Dry Zone ◽  
Animal Interaction ◽  
The Tropics

Plant-animal interaction has been a major theme in ecology as it has helped ecologists to rule out different patterns they observed in the surrounding environments.Chromolaena odoratais another plant species that is studied extensively as it has become a major troublesome weed in many parts of the tropics. But, handful of studies are available on pollination of this invasive plant species in dry forests and its function as a pollinator sink in these environments. The current study was carried out in a dry zone secondary forest patch in North-Central Sri Lanka to assess the diversity, abundance, and pollination strength of flower visitors associated with theC. odorata. The results suggest that the diversity of Hymenoptera and Lepidoptera is higher than the other insect orders that visitedC. odorata, but all species exerted equal pollination strength on the plant. The attraction of large numbers of insects is concluded to as one of the factors that contribute to the reproductive success ofC. odoratain dry zone forests.

scholarly journals THE DISTRIBUTION, IMPORTANCE, BIOLOGY AND CONTROL, OF CHROMOLAENA ODORATA (L.) K.& R.A MAJOR WEED SPECIES OF COCONUT PLANTATION IN SRI LANKA

CORD ◽  
1995 ◽  
Vol 11 (02) ◽  
pp. 34
Author(s):  
T.G.L.G. Gunasekara
Keyword(s):  
Sri Lanka ◽  
Control Measures ◽  
Chromolaena Odorata ◽  
Weed Species ◽  
Seed Biology ◽  
History Of ◽  
Biological Methods ◽  
The Tropics ◽  
And Control ◽  
Asteraceae Family

Chromolaena odorata (1.) K. & R. is a tropical peren­nial weed species qf the Asteraceae family that has be­come a serious problem in coconut plantations in Sri Lanka and in the tropics of Asia and Africa. The history of distribution, habitat and economic importance is summarized The botanical features and seed biology of this species are presented in this review Finally in­formation on the control measures such as mechanical, cultural, chemical and biological methods is discussed.

Chronic Interstitial Nephritis in Agricultural Communities

2018 ◽  
Author(s):  
Channa Jayasumana ◽  
Carlos Orantes ◽  
Marc E. De Broe
Keyword(s):  
Sri Lanka ◽  
Central America ◽  
Interstitial Nephritis ◽  
Agricultural Communities ◽  
The North ◽  
History Of ◽  
North Central Province ◽  
End Stage ◽  
Chronic Interstitial Nephritis ◽  
The Tropics

Chronic Interstitial Nephritis in Agricultural Communities (CINAC) has been increasingly recognized since the early 1990s. It has been called epidemic chronic kidney disease unknown cause (CKDu) in Sri Lanka, and meso-American nephropathy in Central America. CINAC occurs regionally in the Tropics, predominantly in rural/agricultural zones. It is increasingly recognized, but also believed to be increasing in incidence. Men are affected up to three times more often than women. Its incidence increases with age, and a number of other epidemiological factors impact on it. In some areas, such as the North Central Province of Sri Lanka and regions of Central America, it drives extreme rates of CKD and end-stage renal failure. Clinically, it has the non-specific characteristics of other slowly-evolving chronic interstitial nephritis (Chapter 86). Perhaps distinctive is an inconsistent history of episodes of dysuria, sometimes loin pain, in earlier disease. Its aetiology remains unsolved. Maps of incidence commonly show a mosaic pattern, suggesting that exposure to local factors are implicated. It has been associated with working outdoors in high temperatures, but this seems inadequate as the sole explanation. Exposure to nephrotoxins, natural or possibly as agrochemicals, seems likely.

scholarly journals Fine Structure Signatures in Ground Flashes as a Source for HF Radiation

2013 ◽  
Vol 20 ◽  
pp. 91-104
Author(s):  
Mahesh Edirisinghe ◽  
Vernon Cooray
Keyword(s):  
Fine Structure ◽  
Arithmetic Mean ◽  
Return Stroke ◽  
Radiation Fields ◽  
Initiation Process ◽  
Natural Resonance ◽  
Strong Source ◽  
Average Rise ◽  
The Tropics ◽  
Negative Field

Lighting radiation fields below 10 MHz are of considerable interest since these frequencies correspond to the natural resonance of structures with dimensions of a few meters to tens of meters. In this paper we present the fine structure signatures of sub-microsecond range pulses appeared at the leader phase and after the return stroke in negative ground flashes which act as a source for HF radiations at 10 MHz, 5 MHz and 3 MHz observed in Sri Lanka, in the tropics. Of the total sub-microsecond range pulses analyzed, 298 were due to positive field changes and 228 were due to negative field changes. The average rise time of those pulses for both polarities is 127 ns and it was found to be varying from 110-160 ns. The peak amplitude is in the range of 0.65-2.19 V/m. For the total 526 pulses analyzed for this study, the FWHM was between 190-310 ns with an arithmetic mean of 238 ns. Signatures of these pulses are similar to the leader like electric field pulses which acted as a strong source for HF radiations at 10 MHz, 5 MHz and 3 MHz. The initiation process of pulses reported in this study could be similar to the initiation process of leader like pulses.

scholarly journals Fatal colchicine intoxication by ingestion of Gloriosa superba tubers

2019 ◽  
Vol 12 (5) ◽  
pp. e228718 ◽  
Author(s):  
Karthik Gunasekaran ◽  
Divya Elizabeth Mathew ◽  
Thomas Isaiah Sudarsan ◽  
Ramya Iyyadurai
Keyword(s):  
Intensive Care ◽  
Sri Lanka ◽  
South India ◽  
Rescue Therapy ◽  
Multiple Organ ◽  
Gloriosa Superba ◽  
Deliberate Self Harm ◽  
Self Harm ◽  
The Tropics ◽  
Organ Dysfunctions

Gloriosa superba is an ornamental herb, wildly found in the tropics especially in the southern parts of India and Sri Lanka. All parts of the plants are toxic, especially the tuberous rhizomes in view of their high content of colchicines and its derivatives. We report a case of fatal ingestion of the tubers of G. superba, with an intention of deliberate self harm, leading to systemic coagulopathy and progressive multiple organ dysfunctions. The patient was managed with intralipid rescue therapy, plasmapheresis, haemodialysis and intensive care. The ease of availability makes plant poisons, a common method of deliberate self-harm in South India. This report reiterates the need for clinician’s awareness of common toxidromes associated with plant poisons.

Bartonellainfection in urban and rural dogs from the tropics: Brazil, Colombia, Sri Lanka and Vietnam

2012 ◽  
Vol 141 (1) ◽  
pp. 54-61 ◽  
Author(s):  
E. C. BRENNER ◽  
B. B. CHOMEL ◽  
O.-U. SINGHASIVANON ◽  
D. Y. NAMEKATA ◽  
R. W. KASTEN ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Dna Extraction ◽  
Domestic Dogs ◽  
Sri Lankan ◽  
Antibody Prevalence ◽  
Tropical Countries ◽  
Wide Range ◽  
The Tropics

SUMMARYDogs can be infected by a wide range ofBartonellaspp., but limited studies have been conducted in tropical urban and rural dog populations. We aimed to determineBartonellaantibody prevalence in 455 domestic dogs from four tropical countries and detectBartonellaDNA in a subset of these dogs.Bartonellaantibodies were detected in 38 (8·3%) dogs, including 26 (10·1%) from Colombia, nine (7·6%) from Brazil, three (5·1%) from Sri Lanka and none from Vietnam. DNA extraction was performed for 26 (63%) of the 41 seropositive and 10 seronegative dogs. Four seropositive dogs were PCR positive, including two Colombian dogs, infected withB. rochalimaeandB. vinsoniisubsp.berkhoffii, and two Sri Lankan dogs harbouring sequences identical to strain HMD described in dogs from Italy and Greece. This is the first detection ofBartonellainfection in dogs from Colombia and Sri Lanka and identification ofBartonellastrain HMD from Asia.

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