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W. Letchamo · SciRah

Researcher profile · Semantic Scholar

W. Letchamo

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W. Letchamo — researcher profile on SciRah

h-index: 16
Works: 70
Citations: 813

Most-cited papers

Essential oil of Valeriana officinalis L. cultivars and their antimicrobial activity as influenced by harvesting time under commercial organic cultivation.
W. Letchamo, W. Ward, B. Heard, D. Heard
2004Journal of Agricultural and Food Chemistry97 citations
Semantic Scholar
Transpiration, essential oil glands, epicuticular wax and morphology of Thymus vulgaris are influenced by light intensity and water supply
W. Letchamo
199687 citations
Semantic Scholar
Variations in photosynthesis and essential oil in thyme
W. Letchamo, H.-L. Xu, A. Gosselin
199582 citations
Semantic Scholar
A quantitative HPLC method for the quality assurance of Echinacea Products on the North American market
C. Bergeron, J. Livesey, D. Awang, J. Arnason +3 more
200058 citations
Semantic Scholar
Effect of temperature on stability of marker constituents in Echinacea purpurea root formulations.
J. Livesey, D. Awang, J. Arnason, W. Letchamo +2 more
1999Phytomedicine35 citations
Semantic Scholar
Effects of HPS supplemental lighting and soil water levels on growth, essential oil content and composition of two thyme (Thymus vulgaris L.) clonal selections
W. Letchamo, A. Gosselin
199535 citations Open access
Semantic Scholar
Photosynthetic potential of Thymus vulgaris selections under two light regimes and three soil water levels
W. Letchamo, Hui-lian Xu, A. Gosselin
199533 citations
Semantic Scholar
Factors Affecting Echinacea Quality
W. Letchamo, L. V. Polydeonny, N. O. Gladisheva, T. Árnason +4 more
200232 citations
Semantic Scholar
Light, temperature and duration of storage govern the germination and emergence of Taraxacum officinale seed
W. Letchamo, A. Gosselin
199628 citations
Semantic Scholar
Cichoric Acid and Isobutylamide Content in Echinacea purpurea as Influenced by Flower Developmental Stages
W. Letchamo, J. Livesey, C. Bergeron
199926 citations
Semantic Scholar
An Alternative Potential Natural Genetic Resource: Sea Buckthorn [ Elaeagnus rhamnoides (syn.: Hippophae rhamnoides )]
W. Letchamo, M. Ozturk, V. Altay, M. Musayev +2 more
201825 citations
Semantic Scholar
THE PATTERN OF ACTIVE SUBSTANCES ACCUMULATION IN CAMOMILE GENOTYPES UNDER DIFFERENT GROWING CONDITIONS AND HARVESTING FREQUENCIES
W. Letchamo, R. Marquard
199322 citations
Semantic Scholar
Volatile Oil-Bearing Flora of Siberia VIII: Essential Oil Composition and Antimicrobial Activity of Wild Solidago virgaurea L. from the Russian Altai
A. Tkachev, E. Korolyuk, W. Letchamo
200620 citations
Semantic Scholar
Chemical Screening of Essential Oil Bearing Flora of Siberia IV. Composition of the Essential Oil of Nepeta sibirica L. Tops from Altai Region
W. Letchamo, E. Korolyuk, A. Tkachev
200517 citations
Semantic Scholar
Chemical Screening of Volatile Oil-Bearing Flora of Siberia VIII.: Variations in Chemical Composition of the Essential Oil of Wild Growing Seseli buchtormense (Fisch. ex Sprengel) W. Koch from Different Altitudes of Altai Region
A. Tkachev, E. Korolyuk, W. König, Y. Kuleshova +1 more
200616 citations
Semantic Scholar
Developmental and Seasonal Variations in Flavonoids of Diploid and Tetraploid Camomile Liqulate Florets
W. Letchamo
199616 citations
Semantic Scholar
Chemical Screening of Essential Oil Bearing Flora of Siberia V. Composition of the Essential Oil of Chaerophyllum prescottii DC Tops from Altai Region
W. Letchamo, Elena A. Korolyk, A. Tkachev
200513 citations
Semantic Scholar
Effects of zeolite and phosphogypsum on growth, photosynthesis and uptake of Sr, Ca and Cd by barley and corn seedlings
V. S. Krutilina, S. M. Polyanskaya, N. A. Goncharova, W. Letchamo
200013 citations
Semantic Scholar
Variability in chromosomes, herb yield, essential oil content and potentials of horehound for North American commercial production
W. Letchamo, S. Mukhopadhyay
199712 citations
Semantic Scholar
EVALUATION OF THE QUALITY OF WEST AFRICAN SHEA BUTTER (VITELLARIA PARADOXA)
W. Letchamo, B. K. Khoo, T. G. Hartman
200711 citations
Semantic Scholar
The Selection of Thymus vulgaris Cultivars to Grow in Canada.
W. Letchamo, A. Gosselin, J. Hoelzl, R. Marquard
199910 citations
Semantic Scholar
Growth and Essential Oil Content of Angelica archangelica as Influenced by Light Intensity and Growing Media
W. Letchamo, A. Gosselin, J. Hölzl
199510 citations
Semantic Scholar
Effect of zeolite and phosphogypsum on yield, plant uptake, and content of strontium in soil
V. S. Krutilina, N. A. Goncharova, N. P. Panov, W. Letchamo
19999 citations
Semantic Scholar
Root and shoot growth and chlorophyll content of Taraxacum officinale provenances as affected by defoliation and debudding under organic and hydroponic cultivation
W. Letchamo, A. Gosselin
19959 citations
Semantic Scholar
Effect of Storage Temperatures and Duration on the Essential Oil and Flavonoids of Chamomile
W. Letchamo
19937 citations
Semantic Scholar
Chemical Screening of Volatile Oil-bearing Flora of Siberia IX. Variations in Chemical Composition of the Essential Oil of Heteropappus altaicus Willd. (Novopokr.) Growing Wild at Different Altitudes of Altai Region, Russia
A. Tkachev, E. Korolyuk, W. Letchamo
20066 citations
Semantic Scholar
Kinetics and statics of strontium adsorption by zeolites from phosphogypsum
V. S. Krutilina, N. A. Goncharova, W. Letchamo
19986 citations
Semantic Scholar
Effect of nutrient solution concentration on photosynthesis, growth, and content of the active substances of passionfruit 1
W. Letchamo, H.-L. Xu, B. Desroches, A. Gosselin
19936 citations
Semantic Scholar
A COMPARATIVE INVESTIGATION OF CAMOMILE GENOTYPES UNDER EXTREMELY VARYING ECOLOGICAL CONDITIONS
W. Letchamo, A. Vömel
19926 citations
Semantic Scholar
Eco-genetic variations in biological activities of sea berry (Hippophae rhamnoides).
W. Letchamo, T. Molnar, C. Funk
20075 citations
Semantic Scholar
Characterization of natural distribution and some biological traits of Sumach (Rhus coriaria) in central Asia
E. K. Bloshenko, W. Letchamo
19965 citations
Semantic Scholar
Alternative Methods for Determination of Ploidy Level in Chamomile (Chamomilla recutita (L.) Rausch.) Breeding
W. Letchamo, R. Marquard, W. Friedt
19955 citations
Semantic Scholar
A COMPARATIVE STUDY OF CAMOMILE YIELD, ESSENTIAL OIL AND FLAVONOIDS CONTENT UNDER TWO SOWING SEASONS AND NITROGEN LEVELS
W. Letchamo
19925 citations
Semantic Scholar
The Relationship Between Ploidy Level and Certain Morphological Characteristics of Chamomilla recutita
W. Letchamo, A. Vömel
19895 citations
Semantic Scholar
Effect of the trace elements manganese and molybdenum on the leaf yield and content of cardiac glucosides in foxglove, Digitalis grandiflora, Mill.
W. Letchamo
19865 citations
Semantic Scholar
Chemical Screening of Essential Oil Bearing Flora of Siberia II. Composition of the Essential Oil of Schizonepeta annua (Pallas) Schischkin Leaves from Altai Region
W. Letchamo, E. Korolyuk, A. Tkachev
20054 citations
Semantic Scholar
GENOTYPIC AND PHENOTYPIC VARIATION IN FLORAL DEVELOPMENT OF DIFFERENT GENOTYPES OF CAMOMILE
W. Letchamo
19924 citations
Semantic Scholar
SPICES, AROMATIC AND MEDICINAL PLANTS TRADE IN EASTERN ETHIOPIA.
W. Letchamo, H. Storck
19914 citations
Semantic Scholar
Chemical Screening of Volatile Oil Bearing Flora of Siberia VI. Composition of the Essential Oil of Kitagawia baicalensis (Redow. ex Willd.) Pimenov Flowering Tops from Altai Region
W. Letchamo, E. Korolyuk, A. Tkachev
20053 citations
Semantic Scholar
Chemical Screening of Essential Oil Bearing Flora of Siberia I. Composition of the Essential Oil of Galatella biflora (L.) Nees Vegetative Tops From the Altai Region
W. Letchamo, E. Korolyuk, A. Tkachev
20043 citations
Semantic Scholar
Quality assurance and quality control for African natural plant products.
Y. Tadmor, Elton Jefthas, J. Goliath, M. Smith +11 more
20023 citations
Semantic Scholar
Heavy Metal Accumulation in Sea Buckthorn Cultivars in Siberia
W. Letchamo, R. Klevakin, I. I. Lobatcheva, J. Janick +1 more
20023 citations
Semantic Scholar
ETHNO-VETERINARY PRACTICES IN THE FORMER SOVIET UNION
E. K. Bloshenko, L. V. Polydeonny, U. P. Juravliev, W. Letchamo
19963 citations
Semantic Scholar
Cultivating and Breeding of Medicinal and Aromatic Crops
W. Letchamo, L. Craker
19962 citations
Semantic Scholar
The Accumulation of Phenolic Compounds in Genetically Selected Amaranthus hybridus is Influenced by Endophytic Natural Growth Regulator
W. Letchamo, T. G. Hartman, André Gosslin, N. Mamedov +1 more
20171 citations Open access
Semantic Scholar
Chemical Screening of Essential Oil Bearing Flora of Siberia III. Composition of the Essential Oil of Sium latifolium L. Tops from Altai Region
W. Letchamo, E. Korolyuk, A. Tkachev
20051 citations
Semantic Scholar
Evaluation of Siberian sea buckthorn cultivars in Washington State.
I. I. Lobatcheva, W. Letchamo, L. Huszár, S. A. Muchortov +4 more
20021 citations
Semantic Scholar
Medicinal Plants from Central and Western Asia
D. Zaurov, J. Simon, Chung-Heon Park, W. Letchamo +4 more
20021 citations
Semantic Scholar
The Selection and Development of High-quality Echinacea for Industrial Processing
W. Letchamo
19981 citations Open access
Semantic Scholar
Toxic Metals in Different Varieties of Seabuckthorn (Hippophae rhamnoides)
I. Lobacheva, W. Letchamo
19981 citations Open access
Semantic Scholar

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E. Korolyuk×8
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J. Livesey×4
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V. S. Krutilina×3

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