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Biomedical subjects

Kate Jackson

Publications and source records attributed to Kate Jackson.

11 recordsLinked to original sources
PubMed2004

How snakes eat snakes: the biomechanical challenges of ophiophagy for the California kingsnake, Lampropeltis getula californiae (Serpentes: Colubridae).

In this study we investigated how ophiophagous snakes are able to ingest prey snakes that equal or exceed their own length. We used X-ray video, standard video, dissection, and still X-rays to document the process of ophiophagy in kingsnakes (Lampropeltis getula) feeding on corn snakes (Elaphe guttata). Most kingsnakes readily accepted the prey snakes, subdued them by constriction, and swallowed them head first. In agreement with previous observations of ophiophagy, we found that the predator snake forces the vertebral column of the prey snake to bend into waves. These waves shorten the prey's body axis and allow it to fit inside the gastrointestinal (GI) tract and body cavity of the predator. Dissection of a kingsnake immediately following ingestion revealed extensive longitudinal stretching of the anterior portion of the GI tract (oesophagus and stomach), and no visible incursion of the prey into the intestine. X-ray video of ingestion showed that the primary mechanism of prey transport was the pterygoid walk, with some contribution from concertina-like compression and extension cycles of the predator's vertebral column in two out of three observations. Complete digestion was observed in only one individual, as others regurgitated before digestion was finished. X-ray stills taken every 4 days following ingestion revealed that the corn snakes were about half digested within the first 4 days, and digestion was complete within 15 days.

Journal Article↗
PubMed2002

How tubular venom-conducting fangs are formed.

Elapids, viperids, and some other groups of colubroid snakes have tubular fangs for the conduction of venom into their prey. The literature describing the development of venom-conducting fangs provides two contradictory accounts of fang development. Some studies claim that the venom canal forms by the infolding of a deep groove along the surface of the tooth to produce an enclosed canal. In other works the tubular fang is said to form by the deposition of material from tip to base, so that the canal develops without any folding. This study was undertaken to examine fang development and to account for the disagreement in the literature by determining whether fang formation varies among groups of venomous snakes and whether it differs between embryos and adults. Adult and embryonic representatives of elapids and viperids were examined. All fangs examined, elapid and viperid, embryos and adults, were found to develop into their tubular shape by the addition of material to the basal end of the tooth rather than by the folding inward of an ungrooved tooth to form a tubular fang. In some cases, the first fang that develops in embryonic snakes differs morphologically from all those formed subsequently.

Animals↗
PubMed2002

Post-ovipositional development of the monocled cobra, Naja kaouthia (Serpentes: Elapidae).

External morphological development between oviposition and hatching of the monocled cobra, Naja kaouthia, is described. Ten developmental stages are diagnosed according to nine features. These include fusion of the body wall musculature along the ventral midline, appearance of the endolymphatic ducts, formation of the eyelid, and the appearance of scales on the head and body. Additional observations of the developing skull are made at four of these ten stages, based on cleared and stained heads.

Journal Article↗
PubMed2002

Supporting families: how are nursing students being prepared for this developing role across Scotland.

Increasing emphasis on primary care has led to a reappraisal of the scope and importance of nursing work with families. The purpose of this study was to explore the knowledge base of lecturers in Scotland that underpinned instruction of student nurses in working with families at diploma and undergraduate level. A postal survey was conducted throughout the 11 educational institutions providing pre-registration nursing programmes. Data were collected from a purposive sample and quantitatively analysed using descriptive statistics. Qualitative data were subjected to content analysis. The response rate was 54.7% (n=95). Findings showed a consensus about the importance of nursing work with families. Family nursing was seen to be relevant across all branches of nursing and academic programmes. There was no statistically significant difference between the levels of academic qualification and perceived knowledge base of lecturers with reference to family nursing theory. The need for a conceptual framework for family nursing was suggested. Knowledge of family nursing literature was limited and necessity for professional development in the teaching of family nursing was acknowledged. The implications of the inquiry point to the need for the integration of family nursing into nursing curricula in Scotland.

Attitude↗
PubMed1992

Description of a mechanistic approach to pain management in advanced cancer. Preliminary report.

A mechanistic approach to advanced cancer pain management is proposed, based on the clinically perceived anatomical and pathophysiological mechanisms of pain generation. It is an extension of the World Health Organisation (WHO) analgesic ladder in which severity of pain is the principal determinant of analgesic choice. The mechanistic categories are: superficial somatic, deep somatic, visceral and neurogenic (mixed or pure, i.e., nociceptive component present or absent). Allocation of pain to the different categories is based on clinical history, physical findings and investigations to establish the site and extent of active primary or metastatic tumor deposits, and evidence of previous response to medication. Drug choice sequence is determined by the dominant pain mechanism judged to be present and not the severity of the pain. In order to describe this approach, mechanisms of pain, disease distribution and drug treatment have been analysed in the first 20 consecutive patients who consented to enter a longitudinal pain description and evaluation study on admission to an inpatient hospice unit. Despite a high exclusion rate from research standard monitoring due to severity of illness and related factors, the majority of eligible patients approached to enter the study did so, and the pain scoring was well tolerated. The implications of this for future research and clinical practice are discussed. In 6 patients only 1 pain mechanism was identified (visceral 4, deep somatic 2). Two mechanisms were present in 8 patients and 3 mechanisms in 6 patients. The deep somatic mechanism was identified in 15 patients, visceral mechanism in 13, neurogenic in 10 and superficial somatic in 2.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMedDate not supplied

Socialization of coping with community violence: influences of caregiver coaching, modeling, and family context.

A socialization model of coping with community violence was tested in 101 African American adolescents (55% male, ages 9-13) and their maternal caregivers living in high-violence areas of a mid-sized, southeastern city. Participants completed interviews assessing caregiver coping, family context, and child adjustment. Caregiver-child dyads also discussed a film clip depicting community violence. Parental coaching (caregivers' strategies suggesting how to cope) and child-reported coping were coded from the discussion. Coaching, modeling (caregivers' own coping), and family context each contributed to children's coping with violence. Children's problem-focused coping in response to violence had the strongest associations with changes in their adjustment 6 months later. Implications for interventions with youth and families are discussed.

Adaptation, Psychological↗
PubMedDate not supplied

Protective resources and perceptions of stress in a multi-ethnic sample of school-age children.

PURPOSE: To investigate the relationship among protective resources of social connectedness, coping skills, and the perception of stress in 613 Hispanic and White school-aged children. METHODS: A secondary analysis of data, part of a longitudinal cohort-sequential study designed to investigate health-risk behaviors in school-age children. Data were collected by computer-assisted self-interviewing from a non-probability sample of 8-12-year-olds in three independent school districts. FINDINGS: Hierarchical multiple regression analysis indicated that social connectedness and the frequency of coping strategies used accounted for 18.8% of the variation in stress. "Feeling sick" was the primary stressor of the participants, while the two most frequently endorsed coping strategies were "watch TV or listen to music" and "draw, write, or read something." CONCLUSION: The findings are significant because nurses working with children are in a strategic position to assess risk factors and protective resources related to stress and intervene in a timely manner to assist children and families develop resiliency.

Adaptation, Psychological↗