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排序方式: 共有272条查询结果,搜索用时 0 毫秒
71.
Marc Freitag Thomas G Standl Helge Kleinhans André Gottschalk Oliver Mann Christian Rempf Kai Bachmann Andreas Gocht Susan Petri Jakob R Izbicki Tim Strate 《Pancreatology》2006,6(3):232-239
AIMS: To avoid the progression from mild edematous acute pancreatitis (AP) to the severe necrotizing form, one therapeutic option is to improve pancreatic microcirculation and tissue oxygenation. The aim of the study was to evaluate the influence of improved rheology (isovolemic hemodilution) plus enhanced oxygen supply (bovine hemoglobin HBOC-301) on pancreatic microcirculation, tissue oxygenation and survival in severe acute experimental pancreatitis. METHODS: Severe AP was induced in 39 pigs (25-30 kg BW) by stimulation with intravenous administration of cerulein plus a pressure- and volume-controlled 10-min intraductal infusion of glycodeoxycholic acid. Seventy-five minutes after induction of AP, animals were randomized and hemodiluted isovolemically (PAOP constant) with either 10% hydroxyethyl starch (HES) 200,000/0.5 plus HBOC-301 (+0.6 g/dl plasmatic hemoglobin; Oxyglobin, Biopure, Cambridge, Mass., USA), or 10% HES 200,000/0.5, or Ringer's solution to a hematocrit of 15%. Hemodynamics, oxygen transport parameters, pancreatic microcirculation and tissue oxygen tension were evaluated over 6 h. Then the abdomen was closed, animals were extubated and observed for 6 days. After that, the surviving animals were sacrificed and specimens were taken from the pancreas. The histopathologic findings were scored by two blinded pathologists who quantified acinar necrosis, fat necrosis, inflammation and edema. RESULTS: Isovolemic hemodilution with HES plus HBOC-301 reduced mortality and preserved pancreatic microcirculation compared with Ringer's solution, but was not significantly different from hemodilution with HES alone. Only treatment with HES plus HBOC-301 normalized pancreatic tissue oxygen tension compared with IHD with HES or Ringer's solution alone. CONCLUSIONS: IHD with HES plus HBOC-301 as a combination of rheologic and O(2)-delivering therapy may represent a novel therapeutic option for treatment of AP. 相似文献
72.
73.
Natalia M. Kleinhans Todd Richards Kurt E. Weaver Olivia Liang Geraldine Dawson Elizabeth Aylward 《Journal of autism and developmental disorders》2009,39(7):1079-1086
Amygdala dysfunction has been proposed as a critical contributor to social impairment in autism spectrum disorders (ASD).
The current study investigated biochemical abnormalities in the amygdala in 20 high functioning adults with autistic disorder
or Asperger’s disorder and 19 typically developing adults matched on age and IQ. Magnetic resonance spectroscopy was used
to measure N-acetyl aspartate (NAA), creatine/phosphocreatine (Cre), choline/choline containing compounds (Cho), and Myoinositol (mI)
in the right and left amygdala. There were no significant between-group differences in any of the metabolites. However, NAA
and Cre levels were significantly correlated to clinical ratings on the Autism Diagnostic Interview-Revised. This suggests
that altered metabolite levels in the amygdala may be associated with a more severe early developmental course in ASD. 相似文献
74.
This study gives an overview of the main macro- and microstructural differences of ten commercially available total hip resurfacing implants. The heads and cups of resurfacing hip implants from ten different manufacturers were analysed. The components were measured in a coordinate measuring machine. The microstructure of the heads and cups was inspected by scanning electron microscopy. The mean radial clearance was 84.86 microm (range: 49.47-120.93 microm). The implants were classified into three groups (low, medium and high clearance). All implants showed a deviation of roundness of less than 10 microm. It was shown that all implants differ from each other and a final conclusion about the ideal design and material combination cannot be given based on biomechanical data. Widespread use of specific designs can only be recommended if clinical long-term follow-up studies are performed and analysed for each design. 相似文献
75.
Gerald Preibisch Ulrich Kleinhans Rainer Roggenkamp Cornelis P. Hollenberg 《Current genetics》1984,8(6):439-448
Summary The FLP gene from the 2-m DNA of Saccharomyces cerevisiae is shown to be functionally expressed in Escherichia coli leading to site-specific intramolecular as well as intermolecular recombination between IR sequences. The expression was achieved under control of a low expression as well as a high expression E. coli promoter. The FLP gene was found to complement in trans a Flp– plasmid and promote its interconversion.By the use of a low Flp expression plasmid, it could be shown that the rate of interconversion of a Flp– plasmid by complementation in trans, was lower than that of a Flp+ plasmid, suggesting that in addition to the IR sequences another cis-acting function exists.Expression of the FLP gene fused to the lac promoter in an in vitro system yielded two polypeptides with apparent molecular weights of 44,000 and 37,000. The 37,000 dalton polypeptide can also be produced from Flp– plasmids and is generated from a translation start within the FLP gene. The 44,000 dalton polypeptide is considered to represent the FLP gene product. 相似文献
76.
77.
Prahalad Umachigi Sanjay G S Kumar KN Jayaveera Kumar DV Kishore Kumar CK Ashok R Dhanapal 《African journal of traditional, complementary, and alternative medicines》2007,4(4):481-487
Anthocephalus cadamba (Roxb.) Miq. Syn A. chinensis (Lamk) A. Rich (Rubiaceae) is ethnomedicinally widely used in the form of paste by tribe in western Ghats for treating skin diseases. In this context, antimicrobial potential of A. cadamba against a wide range of microorganisms was studied. To validate the ethnotherapeutic claims of the plant in skin diseases, wound healing activity was studied, besides antioxidant activity to understand the mechanism of wound healing. The alchoholic and aqueous extract of this plant showed significant antibacterial and antifungal activity against almost all the organisms: Micrococcus luteus, Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Pseudomonas aeruginosa, and four fungi Candida albicans, Trichophyton rubrum—dermatophyte fungi, Aspergillus niger, Aspergillus flavus and Aspergillus nidulans—systemic fungi, with especially good activity against the dermatophyte (Trichophyton rubrum) and some infectious bacteria (Escherichia coli, Proteus mirabilis and Staphylococcus aureus) with an MIC of 2.5 µg/disc. The results show that A. cadamba extract has potent wound healing capacity as shown from the wound contraction and increased tensile strength. The results also indicated that A. cadamba extract possesses potent antioxidant activity by inhibiting lipid peroxidation and increase in the superoxide dismutase (SOD) and catalase activity. 相似文献
78.
KN Jha 《Medical Journal Armed Forces India》2009,65(1):2-3
Background
In high altitude areas, patients report with irritation, redness and foreign body sensation in their eyes suggesting tear film abnormality due to low humidity and windy environmental conditions.Methods
Tear Break- up Time (TBUT) was studied in 100 subjects consisting of local population and those originally from plains residing in high altitude areas in Ladakh.Result
There were 24% individuals with TBUT of < 5 seconds, 30% between 6-10 seconds and 46% with TBUT of > 10 seconds. In symptomatic patients with TBUT of <5 seconds, eight cases had irritation of eyes, six foreign body sensation and two cases had pain, watering, irritation and redness of eyes. Pterygium was seen in 12 individuals and inter palpebral congestion in 4 cases. Conclusion: A total of 24% cases showed abnormal (<5 seconds) TBUT. Abnormality of tear film in the presence of low humidity and windy condition with high ultraviolet radiation may lead to ocular discomfort and pterygium in these areas.Key Words: Tear Break-up Time (TBUT), High altitude areas (HAA) 相似文献79.
PC Rummel KN Arfelt L Baumann TJ Jenkins S Thiele HR Lüttichau A Johnsen J Pease S Ghosh R Kolbeck MM Rosenkilde 《British journal of pharmacology》2012,167(6):1206-1217
BACKGROUND AND PURPOSE
Here we present a novel series of CCR8 antagonists based on a naphthalene-sulfonamide structure. This structure differs from the predominant pharmacophore for most small-molecule CC-chemokine receptor antagonists, which in fact activate CCR8, suggesting that CCR8 inhibition requires alternative structural probes.EXPERIMENTAL APPROACH
The compounds were tested as inverse agonists and as antagonists against CCL1-induced activity in Gαi signalling and chemotaxis. Furthermore, they were assessed by heterologous competition binding against two radiolabelled receptor ligands: the endogenous agonist CCL1 and the virus-encoded antagonist MC148.KEY RESULTS
All compounds were highly potent inverse agonists with EC50 values from 1.7 to 23 nM. Their potencies as antagonists were more widely spread (EC50 values from 5.9 to 1572 nM). Some compounds were balanced antagonists/inverse agonists whereas others were predominantly inverse agonists with >100-fold lower potency as antagonists. A correspondingly broad range of affinities, which followed the antagonist potencies, was disclosed by competition with [125I]-CCL1 (Ki 3.4–842 nM), whereas the affinities measured against [125I]-MC148 were less widely spread (Ki 0.37–27 nM), and matched the inverse agonist potencies.CONCLUSION AND IMPLICATIONS
Despite highly potent and direct effects as inverse agonists, competition-binding experiments against radiolabelled agonist and tests for antagonism revealed a probe-dependent allosteric effect of these compounds. Thus, minor chemical changes affected the ability to modify chemokine binding and action, and divided the compounds into two groups: predominantly inverse agonists and balanced antagonists/inverse agonists. These studies have important implications for the design of new inverse agonists with or without antagonist properties. 相似文献80.
Fifteen patients with infantile bone and joint infections were studied immunologically and clinically, 3 at the time of illness and 12 later. Abnormality of immunoglobulins, or complement, or phagocytes was found in 9 patients; 6 were within normal limits for the tests undertaken. Immunodeficiency is probably responsible for the subdued clinical signs of infection and for delayed diagnosis in some patients. It was also related to the extent of femoral head damage in infective arthritis of the hip and to the incidence of wound infection in late elective surgery. 相似文献