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排序方式: 共有411条查询结果,搜索用时 15 毫秒
51.
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Hormonal basis for sexual dimorphism of the sound-producing apparatus of the oyster toadfish 总被引:1,自引:0,他引:1
We investigated the endocrine basis for sexual dimorphism of the sound-producing apparatus (swimbladder and attached sonic muscles) in the oyster toadfish Opsanus tau by implanting steroid pellets in gonadectomized females and males. In females, testosterone and dihydrotestosterone caused, respectively, 32.3 and 31.5% increase (P less than 0.0001), and estradiol 17 beta caused 11.3% increase (P less than 0.0104) in swimbladder weight compared with controls. In males, testosterone caused 17.7% (P less than 0.028), dihydrotestosterone 24.0% (P less than 0.0008), and estradiol 10.8% (N.S.) increase from controls. Swimbladder weight gains occurred despite the fact that these fish refused food and did not gain weight. In a final experiment on fed females, testosterone and 11-keto-testosterone caused a similar increase (16.6 and 18.9%, respectively) compared with controls. These results indicate that swimbladders in adults of both sexes retain the ability to respond to steroid treatments and suggest that sexual differences in bladder size are controlled without a critical period by hormonal concentrations within the fish. 相似文献
53.
Background: Nephrotic syndrome in children usually has an onset between 2–8 years of age and steroids form the mainstay of management. Therapy may affect growth in children with relapsing nephrotic syndrome. This study was carried out to correlate growth with the cumulative dose of steroids in children with steroid sensitive nephrotic syndrome (SSNS). 相似文献
54.
Seventy-nine patients underwent lumbar myelography on an outpatient basis, with a low (3.75 g) dose of metrizamide as the radiocontrast agent and a 25-gauge spinal needle used for lumbar puncture. No patient experienced significant neurotoxicity following the examination; 70.8% (56 of 79) experienced minimal (23%) or no (48%) side effects. Three patients (3.8%) were admitted to the hospital for management of common side effects (headache, nausea/vomiting, back pain). We obtained postmyelographic computed tomographic scans on 96% (76 of 79) of the patients. Our initial results suggest that outpatient lumbar myelography is safe and can be performed with a very acceptable incidence of side effects. 相似文献
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JF Rothrock KR Mar TL Yaksh A Golbeck AC Moore 《Cephalalgia : an international journal of headache》1995,15(6):489-493
To investigate the role of central neurotransmitters in the pathogenesis of migraine, we measured cerebrospinal fluid (CSF) levels of certain amino acids (glycine, taurine, glutamine) and metabolites of biogenic amines (5-hydroxyindoleacetic acid and homovanillic acid) in 38 migraine patients and compared them with the levels from 10 headache-free controls. The levels of taurine, glycine and glutamine were significantly higher in the migraine patients (p < 0.0001 for taurine and glycine; p < 0.0009 for glutamine); there were no significant differences among the three migraine subgroups (infrequent migraine, frequent migraine and transformed migraine). In seven patients subsequently treated with divalproex sodium, CSF taurine levels decreased significantly from pretreatment baseline values. These data support the concept that migraine is at least in part a disorder of central neurotransmission. 相似文献
57.
KJELD KR. SKJöRLAND 《European journal of oral sciences》1973,81(7):538-542
abstract — The purpose of the present study was to investigate whether some dental filling materials collect more plaque than others under standardized conditions in vitro and in vivo . Round disks of the filling materials of silicate, composite and amalgam were prepared and placed on an agar/sucrose medium or hung in liquid medium containing 5% sucrose. The mediae were inoculated with Streptococcus mutans OMZ 176 and OMZ 52–3. After 6 d the disks were rinsed in distilled water and the plaque that had accumulated on the surfaces was scraped off and measured by the orcinol method. The materials were also fitted to acrylic plates and introduced into the mouth. Six patients wore two plates each for comparison of the materials and were told to rinse their mouth every hour with 15% sucrose solution. After 8 h the plaque was scraped off and measured. Silicate disks on agar medium invariably produced inhibition zones of about 4 mm. Composites and amalgam showed no such zones. In liquid medium an insignificant amount of plaque was absorbed to the silicate disks, whereas abundant amounts were found on composite materials and some on amalgam disks. The same trend could be demonstrated in the clinical experiments. 相似文献
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Pearl JP Pennypacker JL 《Surgical laparoscopy, endoscopy & percutaneous techniques》2011,21(4):e197-e199
Infarction of the lesser omentum is an infrequent occurrence and is unfamiliar to most clinicians. Patients with this condition present with insidious epigastric pain, peritonitis on examination, and a normal white blood cell count. The computed tomographic scan reveals a focal ill-defined inflammatory mass with attendant fat stranding along the lesser curve of the stomach. In most patients, the diagnosis is secured at operation, although analgesics alone might be sufficient for management of this benign inflammatory condition. We present a case with the classic findings that was managed laparoscopically. Greater familiarity with focal infarction of lesser omental fat might lead to more nonoperative management in the future. 相似文献