Background: The German cockroach (Blatella germanica) is one of the most important vectors of public health interest due to its involvement in the transmission of infectious diseases. Different insecticides are used to control cockroaches; however, resistance developed against most of insecticides has made them ineffective. Attempts should always be made to find proper alternat...

The Asian cockroach (Blattella asahinai Mizukubo) was introduced to Florida in 1986 and has since spread throughout the Southeastern United States. Blattella asahinai is a peridomestic pest and high population densities in residential areas can become a nuisance, especially when adults fly into homes. Few studies to date have been conducted on Asian cockroach control, and we evaluated the effic...

BACKGROUND German cockroach or Blattella germanica is commonly found in homes across the inter-tropical region. The contribution of sensitisation to Blattella germanica in people with asthma in sub-Saharan Africa has not received attention. The aim of this study was to assess the prevalence and investigate the predicting factors of sensitisation to Blattella germanica in patients with asthma in...

Iris florentina, Iris gemanica, Iris pallida, Irones, Irißorental Rhizomes o f Iris pallida and Iris florentina contain — increasing on storage — violet-like smelling C )4-ketones (irones 1 a—c) which develop by oxidative degradation of C3!-triterpenoids. The structure of these precursors is reported as well as the structure of respective C30-homologues. The unusual C3j-structures may derive bi...

Blattella germanica allergen 2(Bla g 2) gene was amplified by RT-PCR from total RNA of Blattella germanica and inserted into pET-41b vector properly. GST-Bla g 2 was expressed in E.coli via IPTG induction, a relative molecular mass of approximately 74kDa was showed by SDS-PAGE. The expressed fusion protein was purified by Ni+-agarose affinity chromatography, an emulsion was prepared with the pu...

-The vitellogenins of Hyalophora cecropia and Blattella germanica have similar Stokes' radii (69 and 75,&), sedimentation coefficients (15.9 and 16.8s) and isoelectric points (pH 5.7 and 5.0), and share similar amino acid compositions with vitellogenins of other animals. The two vitellogenins show no immunological crossreaction. Blattella oocytes take up their own vitellogenin in vivo at a rapi...

The development of a novel repellent plays an important role in the integrated control of Blattella germanica. A series of novel hydronopylformamides derivatives were synthesized from a naturally occurring compound (-)-β-pinene. The structures of these hydronopylformamides derivatives were characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (...

The ribosomal DNA (rDNA) cluster of insects contains several hundred repeating structural-functional units and, therefore, is a typical example of a multigene family. Eukaryotic ribosomal RNA (rRNA) genes (18S, 5.8S, and 28S like) are arranged in tandemly repeated clusters in the nucleolus organizers, separated by several spacers, namely the nontranscribed spacer, the external transcribed space...

This retrospective study reviewed skin prick test (SPT) positive results to various aeroallergens among 2136 children with allergic rhinitis (AR) in Guangzhou City, Southern China. Most (74.67%) of the 2136 children who underwent skin test showed positive reaction to 2-4 allergens. The allergen group with the highest positive incidence was Dermatophagoides pteronyssinus (der.p.) at 93.16%, foll...

background: the german cockroach, blattella germanica l. (dictyoptera: blattellidae), has become resistant to many insecticides due to control failures in hospital and student dormitory settings of southern iran. objective: this study was thus designed to detect and monitor carbamate resistance in two strains of german cockroach using lethal dose bioassay methods. methods: wild dormitory (d) an...