A series of 24a-substituted milbemycin A, deriyatiyes were synthesized from 24a-hydroxymilbemycin A,, which had been obtained by the microbial oxidation of milbemycin A,. The acaricidal activity of each synthesized derivative against 71etrait},chus urticae was tested and some of the derjvatives showed higher activits, than parent milbemyein A4. Among them, 24a-methylmilbemycin A, (22) was the m...

1064 Identification of Articles of Botanical Origin by High-Performance ThinLayer Chromatography Procedure. High-performance thin-layer chromatography (HPTLC) is widely used for botanical identification. Variability of the chromatographic conditions has the potential to significantly impact the results. This informational general chapter describes, with illustrations, the need to control the re...

Mosquito-borne diseases are a consistent problem in Vietnam. Additionally, freshwater snail species agricultural pests and known to be intermediate hosts for several parasitic worms. There is need new complementary botanical pesticidal agents controlling these essential oils have shown promise. In this work, from 2 of Callicarpa ( C. rubella sinuata) 4 Premna P. chevalieri, corymbosa, maclurei,...

Because botanical taxonomies are prototypical classifications it would seem that it should be easy to formalize them as concept lattices or type hierarchies. On closer inspection, however, one discovers that such a formalization is quite challenging to obtain. First, botanical taxonomies consist of several interrelated hierarchies, such as a specimen-based plant typology, a name hierarchy and a...

Ratcheting surfaces are a common motif in nature and appear in plant awns and grasses. They are known to proffer selective advantages for seed dispersion and burial. In two simple model experiments, we show that these anisotropically toothed surfaces naturally serve as motion rectifiers and generically move in a unidirectional manner, when subjected to temporally and spatially symmetric excitat...

BACKGROUND Human scabies is a debilitating skin disease caused by the "itch mite" Sarcoptes scabiei. Ordinary scabies is commonly treated with topical creams such as permethrin, while crusted scabies is treated with topical creams in combination with oral ivermectin. Recent reports of acaricide tolerance in scabies endemic communities in Northern Australia have prompted efforts to better unders...

Plants respond to wounding caused by mechanical stress or herbivory by synthesizing defense proteins. There are no studies reporting the action of induced plant proteins against ticks. The aim of this study was to investigate the effect of mechanically wounded Leucaena leucocephala leaves against Rhipicephalus (Boophilus) microplus. Initially, we carried out time course experiments to evaluate ...

Extracts of an annual herbaceous plant, Kochia scoparia (L.) Schrad (Macrophomina), were bioassayed to determine their acaricidal activities against Tetranychus urticae Koch, Tetranychus cinnabarinus (Boisduval), and Tetranychus viennensis Zacher (Acari: Tetranychidae) in the laboratory. Extracts had both contact and systemic toxicity to these mites. Three solvents were tested for preparing cru...