A New Coating Treatment for Coniferous Seeds

1970 ◽  
Vol 46 (5) ◽  
pp. 406-408 ◽  
Author(s):  
Andrew Radvanyi
Keyword(s):  
North America ◽  
Aluminum Powder ◽  
Small Mammals ◽  
Seed Coating ◽  
Highly Effective ◽  
Coating Procedure ◽  
Forest Lands ◽  
Coating Formulation

Excessive loss of seeds to small mammals has long been considered a major cause of inadequate regeneration of cutover forest lands in North America. While numerous compounds, devices, and practices to minimize such losses have been tried, a fully acceptable and effective seed-coating procedure has not been developed. In the study reported, the widely used seed-coating formulation using endrin, arasan, aluminum powder, and latex is examined, and a new seed-coating formulation employing a highly effective rodent repellent is suggested.

scholarly journals Evidence that HPV vaccine may be effective in preventing cervical cancer

2004 ◽  
Vol 8 (48) ◽  
Author(s):  
◽  
Keyword(s):  
Cervical Cancer ◽  
Human Papillomavirus ◽  
North America ◽  
Hpv Vaccine ◽  
Controlled Trial ◽  
Double Blind ◽  
Highly Effective

Recently published results of a randomised, double-blind, multi-centre, placebo-controlled trial involving 1113 women from North America and Brazil indicate that a vaccine against the two most common human papillomavirus types causing cervical cancer, is highly effective

Germination of R-55 Repellent Treated and Non-Treated Seeds of White Spruce Following Prolonged Cold Storage

1980 ◽  
Vol 56 (2) ◽  
pp. 60-62
Author(s):  
A. Radvanyi
Keyword(s):  
Small Mammals ◽  
Cold Storage ◽  
Forest Regeneration ◽  
White Spruce ◽  
Past Experience ◽  
Significant Decline ◽  
Direct Seeding ◽  
Seed Supply ◽  
Coating Formulation

Depredation of broadcast seed supplies by small mammals has frequently caused forest regeneration endeavours by direct seeding methods to fail and have pointed out the need for a more effective coating formulation to protect the seed supply. Past experience has indicated coniferous seeds may not always be promptly sown following treatment and seeds are frequently returned to cold storage. Tests indicate white spruce seeds treated with the newly developed R-55 rodent repellent/graphite formulation can be safely stored for at least 5.5 years without a significant decline in germinative capacity.

Trends in North American small mammals found in common barn-owl (Tyto alba) dietary studies

1991 ◽  
Vol 69 (12) ◽  
pp. 3093-3102 ◽  
Author(s):  
Donald R. Clark Jr. ◽  
Christine M. Bunck
Keyword(s):  
North America ◽  
Small Mammals ◽  
North American ◽  
Barn Owl ◽  
Annual Precipitation ◽  
Mean Annual Precipitation ◽  
Tyto Alba ◽  
Geographic Regions ◽  
Rats And Mice

Data on mammals were compiled from published studies of common barn-owl (Tyto alba) pellets. Mammalian composition of pellet samples was analyzed within geographic regions in regard to year, mean annual precipitation, latitude, and number of individual mammals in the sample. Percentages of individuals in pellets that were shrews increased whereas the percentages of rodents decreased with greater mean annual precipitation, especially in northern and western areas of North America. From the 1920s through 1980s, in northern and eastern areas the percentage of species that was shrews decreased, and in northern and central areas the percentage of individuals that was murid rats and mice increased. Human alterations of habitats during these seven decades are postulated to have caused changes in available small mammals, leading to changes in the barn-owl diet.

scholarly journals Dynamics of Spruce budworms and single species competition models with bifurcation analysis

2020 ◽  
Vol 9 (6) ◽  
pp. 217-222
Author(s):  
Farah Tasnim ◽  
Md. Kamrujjaman
Keyword(s):  
North America ◽  
Mathematical Models ◽  
Bifurcation Analysis ◽  
Population Model ◽  
Choristoneura Fumiferana ◽  
Single Species ◽  
Species Competition ◽  
Numerical Examples ◽  
Competition Models ◽  
Forest Lands

Choristoneura Fumiferana is perilous defoliators of forest lands in North America and many countries in Europe. In this study, we consider mathematical models in ecology, epidemiology and bifurcation studies; the spruce budworm model and the population model with harvesting. The study is designed based on bifurcation analysis. In particular, the results support population thresholds necessary for survival in certain cases. In a series of numerical examples, the outcomes are presented graphically to compare with bifurcation results.

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