Leyland cypress [·Hesperotropsis leylandii (A.B. Jacks. & Dallim.) Garland & G. Moore, Cupressaceae] is a well-known horticultural evergreen conifer in the United Kingdom, United States, Australia, New Zealand, and other countries. As demonstrated by previous studies, this taxon is a hybrid between alaska (nootka) cypress [Callitropsis nootkatensis (D. Don) Oerst. ex D.P. Little] and monterey c...

BACKGROUND Pollen is an important trigger of allergic rhinitis, conjunctivitis, and/or asthma, and an exacerbating factor in atopic dermatitis. Although it is proposed that protease activity from allergen sources, such as mites, enhances allergenicity, little information is available on that from relevant allergenic pollens such as Japanese cedar and Japanese cypress pollens, which are the majo...

Inhalation of airborne pollen causes irritative symptoms in humans, known as pollinosis. The changing global climate and increased pollution contribute to enhance the release of pollen, thereby increasing the number of people suffering from allergies. We examined the effect of spraying weak alkaline solutions onto cedar trees, the main allergenic culprit in Japan, on pollen release. Weak alkali...

Abstract The conventional stake test is widely used to evaluate wood durability. monitors the deterioration level observed on stakes partially inserted into ground. results are conventionally expressed as relationship between mean and exposure periods. Durability compared groups based results; however, there no scientific basis for comparison. To include a test, we applied survival analysis it....

Pollen counts have been increasing and patients suffering from pollen allergy now exceed 14% of the population of Japan. The amount of pollen has a positive relationship with the air temperatures and solar radiation of the preceding summer. Using this relationship, pollen counts of the next season are estimated roughly. According to the results of cedar flower observations in late autumn, the f...