Lack of analgesic efficacy in female rats of\ud the commonly recommended oral dose of\ud buprenorphine

Previous work in our laboratory showed that the recommended oral dose of buprenorphine (0.5 mg/kg) was not as effective\ud as the standard therapeutic subcutaneous dose for postoperative analgesia in male Long-Evans (hooded) and Sprague-Dawley (albino) rats. The aim of the current study was to extend this analysis to female rats. We measured the pain threshold in adult female rats in diestrus or proestrus before and 30 and 60 min after oral buprenorphine (0.5 mg/kg,), the standard subcutaneous dose of buprenorphine (0.05 mg/kg), or vehicle only (1 ml/kg each orally and subcutaneously). Female rats showed an increased pain threshold (analgesia) after subcutaneous buprenorphine but no change in pain threshold after either oral buprenorphine or vehicle only. Estrous cycle stage (proestrus versus diestrus) did not affect the analgesic effects of buprenorphine, but rats in proestrus showed significantly lower pain thresholds (less tolerance to pain) than did those in diestrus. These results show that the oral dose of buprenorphine recommended for postoperative analgesic care does not induce significant analgesia in female rats and therefore is not as effective as the standard subcutaneous dose

Ingestion of Amniotic Fluid Enhances\ud Opiate Analgesia in Rats

Placenta ingestion has recently been shown to enhance opiate-mediated analgesia produced by morphine injection, footshock, or vaginal/cervical stimulation. The enhancement of the effect of endogenous opiates (especially analgesia) may be one of the principal benefits to mammalian mothers of placentophagia at delivery. During labor and delivery, however, mothers also ingest amniotic fluid (AF) which, unlike placenta, becomes available during, or even before expulsion of the infant. The present experiments were undertaken to determine (a) whether AF ingestion, too, enhances analgesia; if so, (b) whether the effect requires ingestion of, or merely exposure to, AF; (c) whether the effect can be produced by AF delivered directly to the stomach by tube; and (d) whether the enhancement, if it exists, can be blocked by administering an opiate antagonist. Nulliparous Long-Evans rats were tested for analgesia using tail-flick latency. We found that (a) rats that ingested AF after receiving a morphine injection showed significantly more analgesia than did rats that ingested a control substance;' (b) AF ingestion, alone, did not produce analgesia; (c) ingestion of AF, rather than just smelling and seeing it, was necessary to produce analgesia enhancement; (d) AF produced enhancement\ud when oropharyngeal factors were eliminated by delivering it through an orogastric tube; and (e) treatment of the rats with naltrexone blocked the enhancement of morphine-induced analgesia that results from AF ingestion

Placenta Ingestion Enhances Analgesia\ud Produced by Vaginal/Cervical\ud Stimulation in Rats

Ingestion of placenta has previously been shown to enhance opiate-mediated analgesia (measured as tail-flick latency) induced either by morphine injection or by footshock. The present study was designed to test whether placenta ingestion would enhance the partly opiate-mediated analgesia produced by vaginal/cervical stimulation. Nulliparous Sprague-Dawley rats were tested for analgesia, using tail-flick latency, during and after vaginal/cervical stimulation; the tests for vaginal/cervical stimulation-induced analgesia were administered both before and after the rats ate placenta or ground beef. Placenta ingestion, but not beef ingestion. significantly heightened vaginal/cervical stimulation-induced analgesia. A subsequent morphine injection provided evidence that, as in a previous report, placenta ingestion, but not beef ingestion, enhanced morphine-induced analgesia

Dose-Dependent Enhancement of Morphine-Induced Analgesia\ud by Ingestion of Amniotic Fluid and Placenta

Ingestion of amniotic fluid and placenta by rats has been shown to enhance opioid-mediated analgesia. The present studies were designed to examine the effect of several doses and volumes of placenta and amniotic fluid on tail-flick latency in rats treated with 3 mg/kg morphine. The optimal dose of amniotic fluid was found to be 0.25 ml, although 0.50 and 1.0 ml also produced significant enhancement. Doses of 0.125 and 2 ml of amniotic fluid were ineffective, as was a dose of 0.25 ml diluted to 2 ml with saline. The optimal dose of placenta was found to be 1 placenta, although the resulting enhancement was not significantly greater than that produced by 0.25, 0.50, 2.0 or 4.0 placentas. Doses smaller than 0.25 placenta or larger than 4.0 placentas were ineffective. The most effective doses of amniotic fluid and placenta correspond to the amounts delivered with each pup during parturition

Ingestion of amniotic fluid enhances the facilitative effect of VTA morphine on the onset of maternal behavior in virgin rats

Previous research has shown that injection of morphine into the ventral tegmental area(VTA) facilitates the onset of maternal behavior in virgin female rats, and injection of the opioid antagonist naltrexone into the VTA disrupts the onset of maternal behavior in parturient rats. Placentophagia – ingestion of placenta and amniotic fluid, usually at parturition – modifies central opioid processes. Ingestion of the active substance in placenta and amniotic fluid, Placental Opioid-Enhancing Factor (POEF), enhances the hypoalgesic effect of centrally administered morphine, and more specifically, enhances δ- and κ-opioid-receptor-\ud mediated hypoalgesia and attenuates μ-opioid-receptor-mediated hypoalgesia. POEF (in placenta or amniotic fluid) ingestion does not, by itself, produce hypoalgesia. In the\ud present study, we tested the hypothesis that ingestion of amniotic fluid enhances the facilitative effect of opioid activity (unilateral morphine injection) in the VTA on the rate of onset of maternal behavior. Virgin female Long-Evans rats were given one intra-VTA injection of morphine sulfate (0.0, 0.01, or 0.03 μg, in saline) and an orogastric infusion of 0.25 ml amniotic fluid or saline once each day of the first three days of the 10-day testing\ud period. Subjects were continuously exposed to foster pups that were replaced every 12 h; replacement of pups was followed by a 15-min observation period. Maternal behavior\ud latency was determined by the first of two consecutive tests wherein the subject displayed pup retrieval, pup licking in the nest, and crouching over all foster pups, during the 15-min observation. We confirmed the previous finding that the VTA injection, alone, of 0.03 μg morphine shortened the latency to show maternal behavior and that 0.0 μg and 0.01 μg morphine did not. Ingestion of amniotic fluid (and therefore POEF) facilitated the onset of\ud maternal behavior in rats receiving an intra-VTA microinjection of an otherwise subthreshold dose of morphine (0.01 μg)

Amniotic-Fluid Ingestion Enhances the Central\ud Analgesic Effect of Morphine

Amniotic fluid and placenta contain a substance (POEF) that when ingested enhances opioid-mediated analgesia produced by several agents (morphine injection, vaginal/cervical stimulation, late pregnancy, footshock), but not that produced by aspirin injection. The present series of experiments employed quaternary naltrexone, an opioid antagonist that does not readily cross the blood-brain barrier, in conjunction with either peripheral or central administration of morphine, to determine whether amniotic-fluid ingestion (and therefore POEF ingestion) enhances opioid-mediated analgesia by affecting the central and/or peripheral actions of morphine. The results suggest that POEF affects only the central analgesic effects of morphine

When the Opportunistic Adoption of Internet Technologies by Small and Medium-Sized Enterprises Segues into Strategic Use: Cases from a Developing Country Context

It has long been established that small and medium-sized enterprises (SMEs) are laggards in the adoption of information systems and technology. Further, when adoption does occur it is more opportunistic rather than strategic. Strategically, information systems (IS) are used in order to either lower the costs of production, coordination and transactions or to add value to the product, process or service. Against the background of the need to better understand SMEs and their use of information and communication technologies (ICTs), this paper highlights the cases of two SMEs whose opportunistic adoption of Internet technologies resulted in changes to their business models, target markets and increased business value, with technology becoming a key strategic driver for the companies

Teachers’ Expectations of Educational Leaders’ Leadership Approach and Perspectives on the Principalship: Identifying Critical Leadership Paradigms for the 21st Century

Using an exploratory design, with a sample of 97 teachers, this research sought to ascertain teachers’ perspectives on the behaviours and approaches that educational leaders, particularly their principals, should display. This exploration was done against the backdrop of the attitudes to, and expectations of, leaders that are deemed to be characteristics 21st century perspectives on leadership. The research uncovered four main behaviours that teachers expected their principals and other educational leaders to employ in their leadership approaches. These behaviours are: recognition of staff’s commitment, facilitation of participation in decision-making, embrace of teachers’ diverse strengths, and openness to criticism. The four behaviours are captured under the acronym RePaDo and designated “Paradigm RePaDo”. The factors account for 54.53% of the variation in the data which were extracted from a 33-item self-designed instrument. The data analysis was conducted using SPSS V 22. The study makes four recommendations for how principals and other educational leaders may improve their leadership practice

A Holistic Social Constructionist perspective to Enterprise Education

Purpose – Drawing on the Gestalt approach this article proposes a holistic framework for enterprise education (EE) research based on Social Constructionism, illustrating how the latter supports research into experiential learning in EE in 7 UK Higher Education (HE) pharmacy schools. Design/ Methodology/ Approach – This paper is based on a qualitative empirical study involving educators in UK Higher Education Institution (HEI) pharmacy schools in semi-structured interviews, and investigates the delivery of EE through experiential learning approaches. Social Constructionism is proposed as a suitable underlying philosophical paradigm. Findings – A Social Constructionism paradigm, which adopts relative realism ontology, transactional epistemology, and Gadamer’s Hermeneutic Phenomenology, offers a relevant, multi-perspectival philosophical foundation for EE research, supporting transactional relationships within contexts of multiple possibilities. Research limitations/implications – Social Constructionism does not necessarily support the individualistic paradigm, as advocated by Constructivists; and the values associated with the former encourage a more collaborative and cooperative approach different from the latter. Practical implications –The paper supports the understanding that applying experiential learning through inter-disciplinary and inter-professional learning is regarded as an approach beneficial for educators, institutions and learners, within the context of EE. Originality/ value – This paper offers a holistic conceptual framework of Social Constructionism that draws on the ‘Gestalt Approach’, and highlights the harmony between the ontological, epistemological and methodological underpinnings of Social Constructionism. The paper demonstrates the relevance of the proposed framework in EE research within the context of an empirical study, which is different in that it focuses on the delivery aspect of EE by considering the views of the providers (educators), an hitherto under-researched area. Paper type – Research paper Key words: Enterprise education, research philosophy, Social Constructionism, relative realism ontology, transactional epistemology, Gadamer’s Hermeneutic Phenomenology, Gestalt approach