A self-circulation system is presented for a self-refueling insect-mountable biofuel cell (BFC) using trehalose, the main sugar of insect hemolymph. The maximum power density of 10.5 μW/cm was obtained from cockroach hemolymph (CHL) with added trehalase and mutarotase. The electrodes were protected by a dialysis membrane to prevent decrease of open-circuit voltage by adsorption of proteins in t...

Abstrac t -1 . Three fluorescing materials have been discovered in excreta from the American cockroach, Periplaneta americana (L.), and found to increase in concentration as dietary nitrogen increases. 2. These compounds have been identified as kynurenic, xanthurenic and 8-hydroxyquinaldic acids. 3. Feeding cockroaches antibiotic eliminates 8-hydroxyquinaldic acid production, presumably by inhi...

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...

Byrsotria fumigata (Guérin-Méneville, 1857) is an endemic cockroach from Cuba which presents a remarkable variability in the male wings. This contribution addresses differences size and wing shape of males, previously reported on literature. Brachypterous individuals are illustrated variation quantified. The distribution species expanded with two new localities.

The corpora cardiaca of the cockroach Nauphoeta cinerea contain a hypertrehalosaemic hormone (HTH) which is chemically characterized as a blocked decapeptide. The synthetic HTH shows the same chromatographic behaviour as the material isolated from corpora cardiaca. The synthetic peptide causes hypertrehalosaemia and fat body glycogen phosphorylase-activation in N. cinerea as well as in the Amer...

The myoinhibitory peptide leucomyosuppressin (LMS) (pQDVDHVFLRFamide) has been identified and characterized at the molecular level in the cockroach Diploptera punctata through analysis of the organization of both brain cDNA and genomic DNA. Processing of the precursor predicted from DNA sequence would release a single LMS peptide. The organization of the precursor appears to be conserved in oth...

Boric acid dust treatments were evaluated as a tool for the integrated management of the German cockroach, Blattella germanica (L.), in commercial confined swine production. The efficacy of boric acid dust was comparable to that of an organic residual insecticide, cyfluthrin, which is commonly used to control cockroaches in this environment. Fall treatments suppressed the cockroach population f...

Nervous system of Periplaneta americana cockroach is used in a wide range of pharmacological studies, including electrophysiological techniques. This paper presents its role as a preparation in the development of toxinological studies in the following electrophysiological methods: double-oil-gap technique on isolated giant axon, patch-clamp on DUM (dorsal unpaired median) neurons, microelectrod...

Effect of static load on activity of motor centers controlling motor activity (walking, flight) was studied in the American cockroach Periplaneta americana L. It has been established that under effect of load on the animal body the relative excitability of these centers increases. A suggestion is put forward about the presence of common neuronal elements in the generator networks providing moto...

Production of methane in the hindgut of the cockroach Periplaneta americana was found to vary, depending on the feeding regimen. Methane production was positively correlated with the numbers of the ciliate Nyctotherus ovalis living in the cockroach hindgut. Defaunation of the cockroaches by means of low concentrations of metronidazole (Flagyl) resulted in a quick drop of methane production. Add...