Measured energy savings due to photocell control of individual luminaires

The results of a series of measurements into the electrical energy savings achieved by PIR and photocell control of individual fluorescent luminaires are presented. Two versions of the PIR/photocell control system (referred to as ‘intelligent’ luminaires from here on) were tested. The results are compared with estimates of the performance of switchstart and ‘standard’ high frequency fluorescent luminaires.The results show that the original ‘intelligent’ control system installed achieved electrical savings of around 10% when compared to ‘standard’ high frequency fittings. An improved version of the ‘intelligent’ system achieved energy savings averaging around 80% when compared to ‘standard’ high frequency fittings. This latter result is in line with the savings predicted by BRE Digest 272⁽¹⁾ for photoelectric dimming control. The study also showed that these fittings need proper commissioning to return their full potential savings.     

External respiration as an index of the individual physiological characteristics of higher nervous activity in rats

The signals for targeting and assembly of porin, a protein of the mitochondrial outer membrane, have not been clearly defined. Targeting information has been hypothesized to be contained in the N-terminus, which may form an amphipathic alpha-helix, and in the C-terminal portion of the protein. Here, the role of the extreme N- and C-termini of porin from Neurospora crassa in its import into the mitochondrial outer membrane was investigated. Deletion mutants were constructed which lacked the N-terminal 12 or 20 residues or the C-terminal 15 residues. The porins truncated at their N-termini were imported in a receptor-dependent manner into the outer membrane of isolated mitochondria. When integrated into the outer membrane, these preproteins displayed an increased sensitivity to protease as compared to wild-type porin. In contrast, mutant porin truncated at its C-terminus did not acquire protease resistance upon incubation with mitochondria. Thus, unlike most other mitochondrial preproteins, porin appears to contain important targeting and/or assembly information at its C-terminus, rather than at the N-terminus.     

Use of computed tomography to investigate cheek tooth abnormalities in chinchillas (Chinchilla laniger)

Computerised tomographic scanning was used to investigate tooth structure in chinchillas (Chinchilla laniger), both cheek tooth crown and root abnormalities being common in this species. This paper describes a common form of dental disease affecting species with continuously growing teeth, with particular reference to the chinchilla, and confirms the potential role of computed tomography (CT) in its early diagnosis. CT imaging is compared with previously available methods of investigation which frequently fail to detect early pathological changes.