The ability to measure objectively how an animal perceives its home environment is essential for improving the housing and husbandry conditions of laboratory animals. Chewing at cage bars by a rodent may reflect the animal's desire to escape from its home cage and thus provide a measure of the relative aversiveness or inadequacy of different housing conditions from the animal's viewpoint. To assess whether bar chewing by laboratory mice is an escape behaviour, adult male and female ICR-(CD-1) mice were housed individually or in same-sex groups of three in modified shoebox-type cages. Cages had two sets of external bars in the side walls, an equivalent set of bars fixed internally and a Perspex lid. One set of external bars opened daily, allowing the mice to escape into a larger arena. All mice showed a strong preference for chewing at external bars over those that were internal to each cage. After one week of experience, mice also preferred the external bars that opened daily to those that did not open. Behaviour directed towards the cage lid declined over time as the mice experienced the new escape route in the cage side. Interest in the external bars correlated positively with time since last escape. Results confirm that bar chewing reflects an attempt to escape the cage and explore the surrounding area and may provide a suitable behavioural measure of perception of the cage environment for use in welfare assessment.

While serious concerns are often raised when patients abscond or leave unauthorized from psychiatric services, there is limited knowledge about absconsion in forensic psychiatric services. Following the preferred reporting items for systematic reviews and meta-analyses guideline, we searched Medline/PubMed, PsycINFO, EMBASE, CINAHL, Scopus, and Web of Science through May 2020 for eligible reports on absconsion in forensic patients with no language limits. The search string combined terms for absconsion, forensic patients, and psychiatry in various permutations. This was supplemented by snowball searching for additional studies. Of the 565 articles screened, 25 eligible studies, including two interventional, seven cross-sectional, and 16 case-controlled studies spanning five decades were included. Absconsion and re-absconsion rates ranged from 0.2% to 54.4% and 15% to 71%, respectively, albeit higher rates trended with less secure psychiatric units. Previous absconsion, aggression, substance use, high Historical Clinical Risk Management-20 score, anti-sociality, psychiatric symptoms, sexual offending, and poor treatment adherence were the factors reported with a degree of predictive value for absconsion. However, the construct of absconsion was heterogeneous in the included studies and the quality of evidence on the predictors of absconsion was limited. Serious risky behaviors including re-offending, violence, self-harm, suicide, rape, and manslaughter were perpetrated by patients during unauthorized leave. Nevertheless, the rates of re-offending were generally low in the included studies (highest recidivism rate = 0.11). There is need for standardized assessment and documentation of absconsion to improve risk analysis and management. Furthermore, it is necessary to develop a structured guideline for defining absconsion, and to create a protocol that operationalizes all absconsion-related behaviors/events to promote reliable assessment and comparative analysis in future studies.

From the observations of radio and HXR bursts, the escape rate of energetic electrons trapped in the flare loops is studied based on the trap-plus-precipitation model for the kinematics of energetic electrons in solar flares. Coulomb collision is regarded as the main pitch angle scattering of trapped electrons in the decay phase of the event on 2004 December 1. The escape rate of trapped electrons decreases firstly and then increases, which indicates the evolution of the plasma density in the flare loops during the decay phase.

Aims: To compare the clinical characteristics of patients who absconded and those who did not abscond; and to show the types of absconding behaviour in a low secure challenging behaviour mental health unit.

Method: A retrospective case control study was conducted. Details of the absconding incidents were collected from an electronic incident database. Clinical predictors of patients who absconded (cases) and those who did not (controls) were compared. Statistical analysis was performed to determine statistical significance of the observed differences.

Results: 80 admissions resulted from 78 patients during a period of 6½ years. 22% of the inpatients absconded from the unit. 84% of the incidents occurred while patients were utilising their unescorted leave. Only one patient escaped from the building. No serious incidents resulted from any of the abscondings. On univariate analysis, the following predictors were more likely to be statistically associated with patients who absconded from the unit: a history of absconding behaviour and a history of substance misuse or dependence. A history of non-compliance with treatment, a history of sexually inappropriate behaviour and a history of childhood conduct problems showed a trend towards statistical significance.

Conclusion: The clinical characteristics of patients who abscond from low secure units show similarities with those who abscond from other psychiatric inpatient settings.

Declaration of interests: None.

Despite considerable efforts in developing sweetpotato cultivare resistant to two species of sweetpotato weevils, Cylas formicarius and C. puncticollis, no cultivar has yet been bred, utilizing previously identified sources of resistance, and cultivated in any appreciable area for weevil control. Escape, nonpreference, tolerance, and antibiosis, and the possible mechanisms involved do not seem to exist in the sweetpotato plant or cannot be utilized because of the peculiarities of ecology and host plant relationship of the weevils. Since weevil infestation of roots does not adversely affect the growth and reproduction of sweetpotato plants, it is possible that weevil resistance to root infestation does not exist in this crop.