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排序方式: 共有307条查询结果,搜索用时 15 毫秒
1.
Robbert-Jan Roozeman Lasse Murtomäki Kyösti Kontturi 《Journal of electroanalytical chemistry (Lausanne, Switzerland)》2005,575(1):9-17
A recently introduced setup to measure the dynamic interfacial tension of expanding drops was used to compare the adsorption behaviour of a series of lipids at the electrified water∣dichloroethane interface. Phospholipids with saturated carbon chains of different length (DMPC, DPPC, DSPC, DAPC, DBPC), an unsaturated phospholipid (DOPC) and an ethanolamine (DSPE) were compared. It was found that the adsorption decreases with increasing chain length. Also, the increase of the flow rate reduces the degree of adsorption effectively. On the timescale of the experiments, the DSPE, DAPC and DBPC adsorption showed no potential dependence, whereas the adsorption of DOPC was stronger than that of the saturated lipids. Adsorption was modelled using the Langmuir adsorption isotherm; the potential dependence of adsorption is discussed. 相似文献
2.
Expression of Disrupted-In-Schizophrenia-1, a schizophrenia-associated gene, is prominent in the mouse hippocampus throughout brain development 总被引:4,自引:0,他引:4
DISC1 (Disrupted-In-Schizophrenia 1) has been associated with schizophrenia in multiple genetic studies. Studies from our laboratory have shown that Disc1, the mouse ortholog of DISC1, is highly expressed in the dentate gyrus of the hippocampus in the adult mouse brain. Because developmental dysfunction of the hippocampus is thought to play a major role in schizophrenia pathogenesis, and the dentate gyrus is a major locus for adult neurogenesis in the mouse, we investigated Disc1 expression during mouse brain development. Strikingly, Disc1 is strongly expressed in the hippocampus during all stages of hippocampal development, from embryonic day 14 through adulthood. Disc1 mRNA was detected in the dentate gyrus at all stages in which this structure was identifiable, as well as in the cornu ammonis (CA) fields of the hippocampus, the subiculum and adjacent entorhinal cortex, and the developing cerebral neocortex, hypothalamus, and olfactory bulbs, all of which also express Disc1 in the adult mouse brain. In addition, Disc1 mRNA was seen in regions of the developing mouse brain which do not express Disc1 during adulthood, regions including the bed nucleus of the stria terminalis, reticular thalamic nucleus and reuniens thalamic nucleus. These results demonstrate that Disc1 marks the hippocampus from its earliest stages, and suggest that developmental Disc1 dysfunction may lead to defects in hippocampal function that are associated with schizophrenia. 相似文献
3.
Levodopa, bromocriptine and selegiline modify cardiovascular responses in Parkinson's disease 总被引:2,自引:0,他引:2
Haapaniemi TH Kallio MA Korpelainen JT Suominen K Tolonen U Sotaniemi KA Myllylä VV 《Journal of neurology》2000,247(11):868-874
Autonomic nervous system (ANS) involvement is frequently found in Parkinson's disease (PD), but its causal relationship to
the disease itself and its medication is unclear. We evaluated the effects of PD medications on cardiovascular ANS functions.
Heart rate (HR) responses to normal and deep breathing, the Valsalva manoeuvre and tilting, and blood pressure (BP) responses
to tilting and isometric work were measured prospectively in 60 untreated PD patients randomised to receive either levodopa
(n=20), bromocriptine (n=20) or selegiline (n=20) as their initial treatment. The results were compared with those of 28 healthy controls. The responses were recorded
at baseline, after 6 months on medication and following a 6-week washout period. At baseline HR responses to normal breathing,
deep breathing and tilting were already lower and the fall in the systolic BP immediately and at 5 min after tilting was more
pronounced in the PD patients than in the controls. Six months' levodopa treatment diminished the systolic BP fall after tilting
when compared to baseline, whereas bromocriptine and selegiline increased the fall in systolic BP after tilting and selegiline
diminished the BP responses to isometric work. The BP responses returned to the baseline values during the washout period.
The drugs induced no change in the HR responses. Thus PD itself causes autonomic dysfunction leading to abnormalities in HR
and BP regulation and the PD medications seem to modify ANS responses further. Bromocriptine and selegiline, in contrast to
levodopa, increase the orthostatic BP fall and supress the BP response to isometric exercise reflecting mainly impairment
of the sympathetic regulation.
Received: 17 February 2000 / Received in revised form: 25 May 2000 / Accepted: 15 June 2000 相似文献
4.
5.
Angela Sun Quynh Bui Janice Y. Tsoh Ginny Gildengorin Joanne Chan Joyce Cheng Ky Lai Stephen McPhee Tung Nguyen 《Journal of immigrant and minority health / Center for Minority Public Health》2017,19(2):381-391
Having an Advance Directive (AD) can help to guide medical decision-making. Asian Americans (AA) are less likely than White Americans to complete an AD. This pilot study investigated the feasibility and efficacy of a church-based intervention to increase knowledge and behavior change related to AD among Chinese and Vietnamese Americans. This study utilized a single group pre- and post-intervention design with 174 participants from 4 churches. Domain assessed: demographics; AD-related knowledge, beliefs, attitudes, and intentions; AD completion; and conversations with a healthcare proxy. Data were analyzed using Chi square and multiple logistic regression techniques. We observed significant increases in participants’ AD-related knowledge, intentions, and a gain in supportive beliefs and attitudes about AD, resulting in 71.8 % AD completion, and 25.0 % having had a proxy conversation. Providing culturally-tailored intervention and step-by-step guidance can help to achieve significant changes in AD related knowledge and behavior in AA church goers. 相似文献
6.
7.
One-stage laparoscopic restorative proctocolectomy: an alternative to the conventional approach? 总被引:3,自引:4,他引:3
PURPOSE: There is significant concern in the current literature over the safety of laparoscopic techniques in removal of the entire colon and rectum. The purpose of this study was to examine the results of a one-stage laparoscopic-assisted restorative proctocolectomy in patients with mucosal ulcerative colitis and familial adenomatous polyposis in a single institution experience. METHODS: All patients who underwent laparoscopic-assisted one-stage restorative proctocolectomy (29 mucosal ulcerative colitis; 3 familial adenomatous polyposis) over a 24-month period were followed up prospectively for short-term and long-term complications and functional outcome. RESULTS: There were 32 patients (17 males), with a median age of 32 years (range, 16-29 years). There were no conversions to open surgery. There were two intraoperative complications, an inconsequential rectal perforation during mobilization and one staple line misfire. There were 11 postoperative complications: 3 obstruction/ileus, 2 pouchitis, 2 wound infections, 2 strictures, 1 pelvic abscess, and 1 pouch leak (at the top of the "J"). Three patients required reoperation (1 temporary ileostomy, 1 lysis of adhesions, and 1 transpouch drainage). The median number of bowel movements was seven per day (range, 2-15). CONCLUSION: A one-stage laparoscopic-assisted restorative proctocolectomy can be performed effectively and safely. Given that techniques in laparoscopic large-bowel surgery are still evolving rapidly, the role of this operation in the surgical treatment of patients with mucosal ulcerative colitis and familial adenomatous polyposis is likely to expand in the near future. 相似文献
8.
A PKR-like eukaryotic initiation factor 2alpha kinase from zebrafish contains Z-DNA binding domains instead of dsRNA binding domains
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Rothenburg S Deigendesch N Dittmar K Koch-Nolte F Haag F Lowenhaupt K Rich A 《Proceedings of the National Academy of Sciences of the United States of America》2005,102(5):1602-1607
The double-stranded RNA (dsRNA)-dependent protein kinase (PKR) is induced as part of the IFN response in mammals and acts to shut down protein synthesis by the phosphorylation of eukaryotic initiation factor 2alpha (eIF2alpha). In fish, a PKR-like kinase activity has been detected, but the enzyme responsible has eluded characterization. Here, we describe a PKR-like kinase from zebrafish. Phylogenetic analysis shows that the C-terminal kinase domain is more closely related to the kinase domain of PKR than to any of the other three known eIF2alpha kinases. Surprisingly, instead of the two dsRNA binding domains found at the N terminus of PKR, there are two Zalpha domains. Zalpha domains specifically bind dsDNA and RNA in the left-handed Z conformation, often with high affinity. They have been found previously in two other IFN-inducible proteins, the dsRNA editing enzyme, ADAR1, and Z-DNA binding protein 1 (ZBP1), as well as in the poxvirus virulence factor, E3L. This previously undescribed kinase, designated PKZ (protein kinase containing Z-DNA binding domains), is transcribed constitutively at low levels and is highly induced after injection of poly(inosinic)-poly(cytidylic) acid, which simulates viral infection. Binding of Z-DNA by the Zalpha domain of PKZ was demonstrated by circular dichroism. PKZ inhibits translation in transfected cells; site-directed mutagenesis indicates that this inhibition depends on its catalytic activity. Identification of a gene combining Zalpha domains with a PKR-like kinase domain strengthens the hypothesis that the ability to bind left-handed nucleic acid plays a role in the host response to viruses. 相似文献
9.
Background
Small bowel volvulus caused by a jejunal trichobezoar is an extremely rare and life-threatening emergency in children.Case characteristics
An 8-year-old girl with abdominal pain and persistent bilious vomiting.Observation
The abdominal computed tomography scan showed a solitary intraluminal mass and a whirl sign, suggesting the small bowel volvulus. Emergency laparoscopic exploration revealed the rotated segment of small bowel loops by a jejunal trichobezoar.Outcome
Satisfactory recovery after surgery.Message
Trichobezoars should be considered in the differential diagnosis of abdominal pain and projectile vomiting in children. 相似文献10.
Kirsi Sipilä Juha Veijola Jari Jokelainen Marjo-Ritta Järvelin Kyösti S. Oikarinen Aune M. Raustia 《Cranio : the journal of craniomandibular practice》2013,31(3):183-187
Facial pain and other symptoms of temporomandibular disorders (TMD) are rather common in the adult population. According to clinical studies, psychological factors play an important role in the etiology and maintenance of these symptoms. On the other hand, chronic pain can cause depression. The aim of this study was to evaluate the association between symptoms of TMD and depression in a large population sample of young adults. The study was a part of the 31-year follow-up study of the Northern Finland Birth Cohort consisting of 12,058 live births from the year 1966. Questionnaire information concerning TMD symptoms was collected from a subsample of 5,696 subjects. Depression was measured with a question about reported depression (diagnosed by a doctor) and with the Symptom Checklist depression subscale (SCL-25 DS). Of the TMD symptoms, those related to pain had the most significant relations to indicators of depression. In both genders, the proportion of depression indicated with the SCL-25 DS was significantly higher in subjects with pain-related symptoms of TMD, i.e., facial pain and “pain at jaw rest”, and in men with “pain on jaw movement”, compared with non-pain subjects (p<0.05). Other symptoms of TMD also associated significantly with SCL-25 DS (p>0.05), except “difficulties in mouth opening” among women. Among women, the prevalence of recognized depression was also significantly higher in subjects with pain-related symptoms of TMD, compared with subjects with no pain (p≤0.05). Almost all the associations remained significant after adjusting for marital status, education, and self-rated general health. In conclusion, the results show that depression has an association with TMD symptoms, especially those related to pain. When treating patients with facial pain, dentists should consider the possible presence of psychopathology and, if necessary, consult appropriate mental health professionals. 相似文献