Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1600-079X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Li L, Xu JN, Wong YH, Wong JTY, Pang SF, Shiu SYW. Molecular and cellular analyses of melatonin receptor-mediated cAMP signaling in rat corpus epididymis. J. Pineal Res. 1998; 25:219–228. © Munksgaard, Copenhagen〈section xml:id="abs1-1"〉〈title type="main"〉AbstractBy using 2-[125I]iodomelatonin receptor binding studies, we have previously demonstrated high affinity melatonin receptors, the binding activities of which are regulated by testosterone, in the corpus epididymis of rats. In this report, some of the basic molecular and cellular characteristics of these high affinity melatonin receptors in rat corpus epididymis were analyzed. MEL1A and MEL1B receptor mRNAs were expressed by rat corpus epididymal epithelial cells as revealed by in situ hybridization. Functionally, these high affinity melatonin receptors are negatively coupled to adenylyl cyclase via pertussis toxin (PTX) sensitive Gi protein and the inhibitory effects of melatonin on forskolin-stimulated cAMP accumulation were enhanced by 5α-dihydrotestosterone (5α-DHT). Interestingly, opposing interactions between melatonin and (β-adrenergic receptor signaling in rat epididymal epithelial cells were observed with melatonin inhibiting norepinephrine- and isoproterenol-stimulated cAMP accumulation. In conclusion, our data support a modulatory action of melatonin, mediated via pertussis toxin-sensitive Gicoupled MEL1A and MEL1B receptors, in androgenic and adrenergic regulation of rat corpus epididymal epithelial cell functions.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1600-079X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Melatonin has been shown to regulate gene transcription through RZR/ROR nuclear receptors in mammalian cells. Thiazolidine dione CGP 52608 is a selective agonist of RZR/ROR receptors with little or no affinity for the cell surface G protein-coupled melatonin receptors. In this study, we addressed whether nuclear signaling may be involved in indoleamine-induced encystment of the unicellular dinoflagellates by examining their responses to CGP 52608. Three species of dinoflagellates (Alexandrium catenella, Amphidinium carterae, and Crypthecodinium cohnii) encysted in the presence of CGP 52608 and the responses were reversible and dose-dependent. Since a previous study has implicated the involvement of G proteins in mediating indoleamine-induced encystment of dinoflagellates, we explored the possibility of cross-talks between G protein-dependent and nuclear signaling pathways. The responses of A. catenella to either mastoparan (a direct activator of mammalian G proteins) or indoleamines were assessed in the presence or absence of CGP 52608. Interestingly, CGP 52608 synergized with either indoleamines or mastoparan to produce a more rapid encystment response. These findings suggest that nuclear signaling may be involved in the indoleamine-induced encystment of dinoflagellates.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1600-079X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Exogenous indoleamines such as melatonin and 5-methoxytryptamine have been shown to induce cyst formation (encystment) in many species of dinoflagellate. Induction of inositol phosphates formation by indoleamine has previously been demonstrated in Crypthecodiniurn cohnii. In addition, depletion of extracellular Ca2+ blocks the indoleamine-induced encystment. In the present study, 12 indoleamines (including melatonin and related compounds) were examined for their abilities to induce Ca2+ influx, inositol phosphates formation, and encystment in C. cohnii. The results showed that melatonin, 5-methoxytryptamine, and the peptide toxin mastoparan stimulated 45Ca2+ influxes in dose- and time-dependent manners. The EC50 values of 5-methoxytrypramine and mastoparan to stimulate 45Ca2+ uptake were 2 mM and 35 μM, respectively. The 5-methoxytryptamine- and mastoparan-induced 45Ca2+ influx were partially attenuated by the calcium channel blockers, verapamil and ruthenium red. A series of indoleamines were examined for their structure-activity relationship on the induction of encystment and formation of inositol phosphates. Melatonin-induced inositol phosphates formation was completely blocked by U73122, indicating the possible involvement of phospholipase C. Taken together, we conclude that indoleamines may induce encystment of the dinoflagellate C. cohnii via parallel activation of phospholipase C and Ca2+ influx signaling pathways. However, activation of phospholipase C and Ca2+ influx are not always necessary or sufficient for inducing encystment. Also, these data provided the first direct evidence of a Ca2+ influx regulating mechanism in dinoflagellate C. cohnii.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: As part of the ongoing sequencing of the complete Salmonella typhimurium LT2 genome, a partly ordered set of 416 lambda clones has been developed, representing over 90% of the genome. The average insert size is 17 kb. Sequences were obtained from both ends of each clone in this set. A total of over 600 kb of sequence has been deposited in the genome survey sequence section of GenBank. This resource of clones is available from the Salmonella Genome Stock Center. A preliminary comparison with the Escherichia coli K12 genome indicates that there are likely to be many hundred insertion deletion events, encompassing more than one gene, that distinguish these genomes. Fully 30% of the S. typhimurium sequences have no close homologs in the GenBank database.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cutaneous pathology 21 (1994), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We report an unusual case of vulvar acantholytic dermatosis with features of pemphigus vegetans in a 22-year-old Indian girl who presented with a “warty” lesion in her left labium majus. Following excision of this lesion, she presented with 2 localized recurrent lesions on the left and right labia majora about 21/2 years later which were also excised. All 3 biopsies showed histological features typical of pemphigus which included extensive suprabasal acautholysis with bullae formation, prominent villus-like processes at the base of the bullae, focal hyperkeratosis and papillomatosis, and the occasional mixed neutrophil and eosinophilic intraepidermal abscess. IgG and C3 immunofluorescence was positive in the intercellular spaces of the epidermis. These lesions, which probably represent a form of pemphigus vegetans, have not been previously reported as a cause of localized vulvar acantholytic dermatosis.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of advanced nursing 7 (1982), S. 0 
    ISSN: 1365-2648
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Ethnic minority nursing students are different from the majority of white students, and approaches that nursing faculties use in teaching them must also be different. Teaching these students is sometimes viewed by many faculties as a threat. However, if difficulties are recognized early and handled efficiently, educating the ethnic minority students can instead become a challenge to the nurse educators.The authors propose some ways to deal with the existing or potential difficulties that arise from teaching these students. These suggestions are made with major emphasis on the student, the teaching process, and the curriculum. Ethnic minority students need to be helped to develop a positive self-esteem, a sense of worthiness and a feeling of equality and acceptance. Nursing faculties are charged with this responsibility and must be committed to it. Furthermore, nursing curricula need to take into account cultural diversity, to increase students’ understanding of the impact of cultural diversities on health care. This paper presents a viewpoint from which important questions related to problems associated with teaching minority students, could be raised.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of advanced nursing 6 (1981), S. 0 
    ISSN: 1365-2648
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Curriculum is the educational design of learning experiences for the students. Curricular experiences include course content as well as learning activities. The selection and organization of curricular experiences must also reflect the philosophy of the school.The identifying and organizing of curricular experiences begins with the analysis of curriculum objectives. The most commonly used approach in selecting learning experiences is the logical approach in which the process is treated as content in curriculum development. This paper attempts to analyse the selection and organization of the first year curricular experiences of the proposed curriculum by applying the logical approach.The proposed curriculum is designed for a 2-year diploma school of nursing. Nursing is offered as a continuum of increasing complexity throughout the three semesters of each year. The curricular framework is based on the health field concept; curricular experiences are selected and organized in accordance with this concept. Courses related to the four elements of the health field concept become mandatory classes for all students. Similarly clinical experience is organized so that a total integration of knowledge from these four elements is enhanced. The first year students study the general aspects of health and health field concept; the nursing process; helping relationships and selected skills necessary for meeting patient's physiological needs. The last semester of the first year is a synthesis practicum proposed to integrate principles and theories which the students have acquired previously and to apply them to the practice of nursing.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of advanced nursing 10 (1985), S. 0 
    ISSN: 1365-2648
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Nursing students, like their college counterparts, are beginning to revolt against hierarchical authority and to claim a more active part in their educational planning. Nurse educators can no longer assume that their students will never revolt; they must face up to the challenge of developing strategies for proper management of student unrest. The authors propose some ways to deal with the complex issue of student unrest. These suggestions are made with emphasis on faculty-student relationship and the curriculum. Improved faculty-student relationships, proper utilization of student peer influence and student involvement in curriculum planning are some of the strategies proposed in this paper.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of advanced nursing 8 (1983), S. 0 
    ISSN: 1365-2648
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Teachers in both general and professional education are well aware of the importance of motivation as the basis of effective teaching. Heidgerken maintains that a major problem that faces nursing educators is to select the right type of motivation and to know how to effect motivation. The authors propose a conceptual model for developing strategies to deal with motivational problems. This model is an application of Vroom's value/expectancy theory and Rotter's social learning theory, and is based on the premise that nursing faculty are in strategic positions to enhance student motivation for learning by manipulating variables that are believed to influence motivation. These suggested strategies include: enhancing student's need value by rewarding them with rewards that they value the most; increasing student's perceptions of a strong link between performance and rewards; providing students with consistent and clear role perceptions; improving student satisfaction towards learning.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...