301
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Finn JP, Siewert B, Mueller M. Portal magnetic resonance angiography. Magn Reson Imaging Clin N Am 1993; 1:271-80. [PMID: 7584223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
MR angiography has shown definite clinical use in the portal venous system. Methods have been developed for noninvasive assessment of portal venous anatomy and blood flow using a variety of techniques. Time-of-flight techniques for portal angiography and both time-of-flight and phase-contrast techniques for flow measurement are reviewed.
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302
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Inoue M, Finger WJ, Mueller M. Influence of aluminum oxalate solutions acidity and conditioning times on resin bond strength to enamel. AMERICAN JOURNAL OF DENTISTRY 1993; 6:243-7. [PMID: 7880468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The present investigation demonstrated that variations in pH between 0.8 and 2.1 and in the duration of etching with an aluminum oxalate/glycine conditioning solution between 5 and 120 seconds has no influence on the retentive strength of restorative polymer to enamel, although the micromorphological appearance of enamel is clearly affected. The lower the pH of and the longer the etching time with the conditioning solution, the more pronounced is the roughness pattern generated. SEM inspection of the fracture sites following debonding of shear bond strength specimens verified consistently cohesive failure in resin close to the interface.
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303
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Tschudi J, Mueller M, Klaiber C. [Does laparoscopic lysis of adhesions make sense?]. SCHWEIZERISCHE MEDIZINISCHE WOCHENSCHRIFT 1993; 123:1128-1130. [PMID: 8511547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Between May 1989 and December 1991 23 patients were operated on laparoscopically for symptomatic peritoneal adhesions. 19 were followed up by telephone using a standardized questionnaire an average of 18.3 months post-operatively (range 5-36 months). 12 patients were totally painfree, 3 complained of slight pain, 2 patients of fairly severe and 2 of severe pain. 15 patients considered the outcome of the operation to be good or fairly good and 18 said they would undergo the same operation in similar circumstances. We therefore recommend laparoscopic adhesiolysis in cases of acute or chronic abdominal pain, provided other causes of abdominal discomfort have been ruled out.
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304
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Ramanadham S, Bohrer A, Mueller M, Jett P, Gross RW, Turk J. Mass spectrometric identification and quantitation of arachidonate-containing phospholipids in pancreatic islets: prominence of plasmenylethanolamine molecular species. Biochemistry 1993; 32:5339-51. [PMID: 8499439 DOI: 10.1021/bi00071a009] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
D-Glucose induces insulin secretion from beta-cells of pancreatic islets by processes involving glycolytic metabolism and generation of ATP. Glucose also induces hydrolysis of beta-cell membrane phospholipids and accumulation of nonesterified arachidonate, which facilitates Ca2+ entry and the rise in beta-cell Ca2+ concentration that is a critical signal in the induction of insulin secretion. Glucose-induced hydrolysis of arachidonate from beta-cell phospholipids is mediated in part by an ATP-stimulated, Ca(2+)-independent (ASCI)-phospholipase A2 (PLA2), which, in vitro, prefers plasmalogen over diacylphospholipid substrates, but it is not known whether islets contain plasmalogens. We have identified and quantitated the major species of arachidonate-containing phospholipids in pancreatic islets by high-performance liquid chromatographic and mass spectrometric analyses. Arachidonate has been found to constitute 30% of the total islet glycerolipid fatty acyl mass. Ethanolamine phospholipids contain 30% of total islet arachidonate, and 44% of that amount resides in three plasmenylethanolamine molecular species with residues of palmitic, oleic, or stearic aldehydes in the sn-1 position. These endogenous islet plasmenylethanolamine species are hydrolyzed more rapidly than phosphatidylethanolamine species by islet ASCI-PLA2 in vitro and are also hydrolyzed in intact islets stimulated with secretagogues. ASCI-PLA2-catalyzed hydrolysis of islet plasmenylethanolamine species in vitro is inhibited by a selective haloenol lactone suicide substrate (HELSS) which is sterically similar to plasmalogens, and HELSS also inhibits all temporal phases of both eicosanoid release and insulin secretion from secretagogue-stimulated pancreatic islets. Islet beta-cell ASCI-PLA2-catalyzed hydrolysis of arachidonate from endogenous plasmenylethanolamine substrates may be an intermediary biochemical event in the induction of insulin secretion.
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305
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Lingenfelser T, Mueller M, Marks IN, Dette S, Wehrman M, Scheurlen M. Endoscopic laser therapy in a case of gastric antral vascular ectasia (watermelon stomach). ZEITSCHRIFT FUR GASTROENTEROLOGIE 1993; 31:322-4. [PMID: 8322479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We report the case history of a 75-year-old female patient suffering from extensive gastric antral vascular ectasia (watermelon stomach) with portal hypertension in alcoholic liver cirrhosis. Iron deficiency anaemia, due to chronic blood loss from the antral lesions, required repeated transfusions. Conservative treatment failed, but a surgical intervention (antrectomy) was discarded in view of concomitant diseases. Endoscopic laser photocoagulation therapy with a Nd:YAG-laser eradicated the characteristic antral lesions, which was accompanied by a significant reduction of transfusion requirements. No relapse has been observed since then. Endoscopic laser photocoagulation appears to be an efficacious and safe alternative in the treatment of gastric antral vascular ectasia.
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306
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Tanner R, Mueller M, Ostermann H. Spinal OrthoticsSelective Use in Rehabilitation of Vertebral Osteoporosis. J Back Musculoskelet Rehabil 1993; 3:44-56. [PMID: 24573096 DOI: 10.3233/bmr-1993-3309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Symptomatic involutional osteoporosis is a significant clinical problem. The prevalence of radiographic vertebral compression fractures (VCF) reached 26% in a rigorous population study of men and women more than 50 years old.1 However, only an estimated 8% of the total affected population actually seek medical attention.2-4 Investigations of effective medical therapy have been extensive, while sound studies of the physical therapeutic measures have been relatively few.5-10Pain and loss of functional mobility result from this disorder. Kyphosis, with or without vertebral compression fracture, is the major structural culprit that produces these disabling clinical problems. Spinal orthoses are used clinically for mechanical support and pain relief of osteoporosis.5,11-13 However, little research exists on the efficacy of orthotics in osteoporosis. This article provides a practical approach to guide the practitioner in orthotic selection for selected patients. New concepts presented may stimulate further research interest and more appropriate orthosis prescription. By focusing on level of fracture, biomechanical deficits, and physiatric team mangement, the end product can better satisfy the patient.
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307
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Schilling T, Mueller M, Minne HW, Ziegler R. Mineral apposition rate in rat cortical bone: physiologic differences in different sites of the same tibia. J Bone Miner Res 1992; 7 Suppl 2:S429-32. [PMID: 1485552 DOI: 10.1002/jbmr.5650071412] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The mineral apposition rate (MAR) is a commonly used parameter for the characterization of bone formation and is often determined to test for experimental effects on cortical bone. We investigated whether there are physiologic variations in rat cortical MAR dependent on the side or site of measurement. In our experiment we used female rats. The animals were sacrificed on day 8, after double-fluorochrome labeling with calcein and tetracycline was performed. The MAR was calculated at 3.6, 5.4, 7.2, 9, and 10.8 mm from the epiphyseal growth plate of the lateral as well as of the medial endosteum of both right and left tibiae. We found a physiologic significant difference in the MAR between the lateral and the medial endosteal sites of the same tibia (p < 0.0001), especially near the epiphyseal growth plate. Regarding the same cortical side, there is a significant decrease (p < 0.0001) in the endosteal MAR with increasing distance from the epiphyseal growth plate. We conclude that the observed differences in endocortical MAR must be due to specific mechanical challenges. Because these differences are statistically significant, it is necessary to standardize the area of histomorphometric measurement not only with respect to the distance from the epiphyseal growth plate, but also with respect to the cortical side.
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308
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Mueller M, Schilling T, Minne HW, Ziegler R. Does immobilization influence the systemic acceleratory phenomenon that accompanies local bone repair? J Bone Miner Res 1992; 7 Suppl 2:S425-7. [PMID: 1485551 DOI: 10.1002/jbmr.5650071411] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The rate of remodeling in the region of a bone defect exceeds normal tissue activity. It was Frost who described this reaction as the regional acceleratory phenomenon (RAP). We previously showed that restoration of a local bone defect in the rat leads not only to RAP but also leads to a systemic acceleration of osteogenesis (systemic acceleratory phenomenon, SAP) in distant sites of the skeleton. In this study we investigated the impact of immobilization of the defect-bearing extremity on the development of SAP. A hole 1.2 mm in diameter was drilled in the diaphysis of the left tibia of female rats. In the experimental group (n = 15), a knee tenotomy was performed in the defect-bearing left hind leg. We examined both femora, both tibiae, and the fourth lumbar vertebra by computed x-ray densitometry on day 7 postoperatively. Immobilization of the defect-bearing limb led to a decrease in x-ray density not only of the immobilized (p < 0.0001) but also of the contralateral tibia (p < 0.0001). Both femora (p < 0.001) and the fourth lumbar vertebra (p < 0.025) of the experimental group also showed a significant decrease in x-ray density. We previously showed that SAP leads to an increase in x-ray density of both femora. This increase is no longer detectable in animals after immobilization of the defect-bearing limb. Thus we conclude that immobilization interferes with SAP. This suggests the possible dependence of SAP on mechanical load. Furthermore, these data suggest a possible impact of local immobilization on the rest of the skeleton.
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309
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Wels W, Harwerth IM, Mueller M, Groner B, Hynes NE. Selective inhibition of tumor cell growth by a recombinant single-chain antibody-toxin specific for the erbB-2 receptor. Cancer Res 1992; 52:6310-7. [PMID: 1358432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
A high percentage of human breast and ovarian tumors display amplified c-erbB-2 gene copies, leading to overexpression of the growth factor receptor. Its membrane location and elevated expression make the erbB-2 protein an appropriate target for a directed tumor therapy. We have used recombinant DNA technology to produce a single-chain antibody-exotoxin A (scFv-ETA) fusion protein which specifically binds the human erbB-2 receptor. The scFv portion is composed of the heavy- and light-chain variable domains of a monoclonal antibody which recognizes the extracellular domain of the human erbB-2 receptor. The bacterially produced scFv-ETA protein was shown to bind specifically to cells expressing the human erbB-2 protein. The scFv-ETA inhibits protein synthesis in erbB-2-expressing tumor cells at doses ranging from 2 to 200 ng/ml and is cytotoxic for these cells at equivalent doses. In athymic nude mice, administration of the scFv-ETA inhibited the growth of erbB-2-overexpressing human ovarian carcinoma cells.
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310
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Abstract
The validity of the Threat Index was examined in a study of 42 students and 15 HIV+ clients. When completing the Threat Index, subjects rate the self and death on 30 bipolar adjectives. A count is made of the number of times the same adjective poles are used to describe the self and death. Uses of the same poles are called matches, while uses of different poles are called splits. The Threat Index is based on the assumption that splits indicate threat. Analysis showed that neither splits nor matches were usually threatening and that neither was necessary or sufficient for the experience of threat. These results did not support the validity of the Threat Index.
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311
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DeMeules JE, Pigula FA, Mueller M, Raymond SJ, Gamelli RL. Tumor necrosis factor and cardiac function. THE JOURNAL OF TRAUMA 1992; 32:686-92. [PMID: 1613827 DOI: 10.1097/00005373-199206000-00003] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The direct effect of tumor necrosis factor (TNF), a product of activated macrophages, on myocardial performance was determined using an isolated papillary muscle technique and a modified Langendorff preparation. Papillary muscle was obtained from male adult rats 4-5 hours after they received either 100 ng/kg TNF (group A), or 100 micrograms/kg TNF (group B) or saline (control). Group B animals exhibited significantly greater peak tension development and velocity of contraction compared with controls (p less than 0.05). In group A animals these variables were not significantly different from those of the controls (p greater than 0.05). Electrophysiologic measurements revealed a significant decrease in resting membrane potential in both group A and group B animals compared with the controls (p less than 0.05). Whole hearts perfused with serum from animals treated with TNF 18-22 hours earlier exhibited significant impairment of contractility, decreased rate of systolic pressure development, and decreased rate of relaxation compared with the controls (p less than 0.05). Coronary flow and myocardial water content were similar for both groups of perfused hearts. These data suggest that tumor necrosis factor stimulates an early beneficial effect on myocardial function, which 18-22 hours later is associated with impairment of myocardial performance. This effect appears to be serum transferable.
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312
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Turk J, Mueller M, Bohrer A, Ramanadham S. Arachidonic acid metabolism in isolated pancreatic islets. VI. Carbohydrate insulin secretagogues must be metabolized to induce eicosanoid release. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1125:280-91. [PMID: 1596516 DOI: 10.1016/0005-2760(92)90057-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Pancreatic islets stimulated with D-glucose are known to liberate arachidonic acid from membrane phospholipids and release prostaglandin E2 (PGE2). A component of the eicosanoid release induced by D-glucose has been demonstrated to occur without calcium influx and must be triggered by other coupling mechanisms. In this study, we have attempted to identify mechanisms other than calcium influx which might couple D-glucose stimulation to hydrolysis of arachidonate from membrane phospholipids in islet cells. We have found that occupancy of the beta cell plasma membrane D-glucose transporter is insufficient and that D-glucose metabolism is required to induce islet PGE2 release because 3-O-methylglucose fails to induce and mannoheptulose prevents PGE2 release otherwise induced by 17 mM D-glucose. The carbohydrate insulin secretagogues mannose and D-glyceraldehyde have also been found to induce islet PGE2 release, but the non-secretagogue carbohydrates L-glucose and lactate do not. Carbohydrate secretagogues are known to be metabolized to yield ATP and induce depolarization of the beta cell plasma membrane. We have found that depolarization by 40 mM KCl induces PGE2 release only in the presence and not in the absence of extracellular calcium, but exogenous ATP induces islet PGE2 release with or without extracellular calcium. Carbachol is demonstrated here to interact synergistically with increasing concentrations of glucose to amplify PGE2 release and insulin secretion. Pertussis toxin treatment is shown here not to prevent PGE2 release induced by glucose or carbachol but to increase the basal rate of PGE2 release and the islet cyclic AMP content. Theophylline (10 mM) exerts similar effects. Eicosanoid release in pancreatic islets can thus be activated by multiple pathways including muscarinic receptor occupancy, calcium influx, increasing cAMP content, and a metabolic signal derived from nutrient secretagogues, such as ATP.
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313
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Kopchok GE, White RA, Mueller M, Cavaye D. Percutaneous laser discectomy. JOURNAL OF CLINICAL LASER MEDICINE & SURGERY 1992; 10:79-82. [PMID: 10149904 DOI: 10.1089/clm.1992.10.79] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
Percutaneous discectomy, for treatment of lumbar disc herniation, was first described in 1975 by Hijikta. Since its inception, a variety of instruments including rongeurs, augers, automated mechanical devices, and more recently, lasers have been developed to remove tissue from the herniated disc. The advantages of lasers include miniaturized, safe, and efficient energy delivery for percutaneous tissue removal. This article reviews the development of lasers for percutaneous discectomy.
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314
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Monk TG, Mueller M, White PF. Treatment of Stress Response during Balanced Anesthesia Comparative Effects of Isoflurane, Alfentanil, and Trimethaphan. Anesthesiology 1992; 76:39-45. [PMID: 1346082 DOI: 10.1097/00000542-199201000-00006] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Acute hypertensive responses during nitrous oxide-opioid-relaxant anesthesia are a common clinical problem. In adult men undergoing radical prostatectomy procedures and anesthetized with a standardized technique, we evaluated the effectiveness of alfentanil, isoflurane, and trimethaphan in treating acute hemodynamic and stress hormone responses to surgical stimulation. Stress hormone concentrations were measured 1 min before skin incision, after the onset of an acute hypertensive response, and after returning the mean arterial pressure to within 10% of the preincision values with one of the three treatment modalities. Pretreatment plasma alfentanil concentrations (151 +/- 47 to 156 +/- 47 ng.ml-1) and end-tidal nitrous oxide concentrations (66 +/- 2 to 68 +/- 2%) were similar in all three groups. Acute hypertensive events were associated with significantly increased concentrations of catecholamines and vasopressin (antidiuretic hormone [ADH]). Whereas intravenous alfentanil returned all hormone concentrations to preincision values, norepinephrine and glucose concentrations were significantly increased after adjunctive isoflurane administration. Although trimethaphan decreased the norepinephrine concentration, the epinephrine, beta-endorphin, cortisol, ADH, and glucose concentrations were significantly increased compared to preincision values. However, the persistent elevation in the posttreatment ADH concentration in the trimethaphan group was the only significant difference between the three groups. Mean (+/- standard deviation) times to awakening (2.8 +/- 3.3 to 3.8 +/- 4.2 min), extubation (8.1 +/- 4.8 to 10.3 +/- 8.5 min), and orientation (19.6 +/- 20.4 to 24.6 +/- 19.1 min) were similar in all three groups. Naloxone was required more frequently in patients in the alfentanil (35%) and isoflurane (24%) groups than in the trimethaphan group (4%).(ABSTRACT TRUNCATED AT 250 WORDS)
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315
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Spurzem JR, Thompson AB, Daughton DM, Mueller M, Linder J, Rennard SI. Chronic inflammation is associated with an increased proportion of goblet cells recovered by bronchial lavage. Chest 1991; 100:389-93. [PMID: 1864112 DOI: 10.1378/chest.100.2.389] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
To evaluate the possibility that bronchoalveolar lavage could provide sufficient respiratory epithelial cells to quantify changes in epithelial cell types associated with chronic inflammation, we examined the epithelial cells obtained in the first infused (20 ml) aliquots that were processed separately from later aliquots, a process known to enrich for bronchial contents. Epithelial cells, including ciliated cells, goblet cells, and fragments of desquamated epithelium, were easily identified after preparation by cytocentrifugation and staining with a modified Giemsa stain. Quantification of the columnar cell types revealed that those with chronic bronchitis and asymptomatic smokers have increased goblet cells as a percentage of the total columnar epithelial cells (chronic bronchitics 36 +/- 2 percent, asymptomatic smokers 22 +/- 2 percent) compared with normal subjects (9 +/- 1 percent, p less than 0.001, ANOVA). Significantly, the goblet cell percentage was strongly correlated with other measures of bronchitis and measures of airflow obstruction such as the bronchitis index, a visually derived score at bronchoscopy of airway inflammation (r = 0.72, p less than 0.001), the percent neutrophils in the first infused aliquots (r = 0.44, p less than 0.05), and the FEV1 percent (r = -0.74, p less than 0.001). Thus, bronchoalveolar lavage is capable of providing sufficient bronchial epithelial cells for analysis, and the changes seen in the spectrum of columnar epithelial cells may reflect important underlying pathologic changes.
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316
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Mueller M, Schilling T, Minne HW, Ziegler R. A systemic acceleratory phenomenon (SAP) accompanies the regional acceleratory phenomenon (RAP) during healing of a bone defect in the rat. J Bone Miner Res 1991; 6:401-10. [PMID: 1858523 DOI: 10.1002/jbmr.5650060412] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The rate of remodeling in the region of a bone defect exceeds normal tissue activity. It was Frost who described this reaction as a regional acceleratory phenomenon (RAP). We investigated the local healing process with rats with a burr hole defect (1.2 mm in diameter) in the left tibia. We differentiated an initial phase of bone formation followed by a phase of predominant resorption. To determine whether this regional enhancement of bone formation would result in a systemic impact on bone metabolism, we analyzed both tibiae and femora and the fourth lumbar vertebra. On day 7 both femora of rats with the tibial defect showed a significant increase in computerized x-ray density, dry weight, ash weight, and Ca2+ content. Both tibiae and the fourth lumbar vertebra showed a significant increase in mineralizing surface, mineral apposition rate, and bone formation rate. Because of these results we conclude that a systemic acceleratory phenomenon (SAP) accompanies the RAP. SAP affects only the cancellous, but not the cortical bone compartment. SAP is associated closely with the occurrence of woven bone during the formation phase of the healing process. Thus we assume that woven bone formation plays a pivotal role in the mediation of SAP.
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317
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Chen BD, Mueller M. Recombinant tumor necrosis factor enhances the proliferative responsiveness of murine peripheral macrophages to macrophage colony-stimulating factor but inhibits their proliferative responsiveness to granulocyte-macrophage colony-stimulating factor. Blood 1990; 75:1627-32. [PMID: 2183886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Tumor necrosis factor (TNF) is a protein produced by activated macrophages in response to endotoxin. The effect of recombinant murine TNF (rMuTNF) on the growth of murine tissue-derived macrophage colony-forming units (CFU-M) which are responsive to both macrophage and granulocyte-macrophage colony-stimulating factors (M-CSF and GM-CSF), was studied. TNF alone did not stimulate macrophage proliferation but did prolong their survival in vitro. The proliferative response of CFU-M to M-CSF, however, was greatly enhanced by the presence of TNF. The enhancement effect of TNF is dose-dependent, reaching a maximum at approximately 50 U/mL. In contrast, the proliferative responsiveness of CFU-M to GM-CSF was inhibited by the concurrent addition of rMuTNF. Both effects appear to be caused directly by rMuTNF, rather than by the secondary factor(s) produced by TNF-treated macrophages. TNF treatment also induced a transient downmodulation of M-CSF receptors in cultured macrophages and accelerated their uptake and use of exogenous M-CSF, which may account for, at least in part, the enhanced proliferative activity in response to M-CSF. Short-term treatment (24 hours) was not sufficient to induce either an enhancing or an inhibitory effect upon CFU-M. This study suggests an autoregulatory role for TNF in the production of mature tissue macrophages by selectively enhancing their proliferative response to lineage specific growth factor, M-CSF.
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318
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Barendsen N, Mueller M, Chen B. Inhibition of TPA-induced monocytic differentiation in THP-1 human monocytic leukemic cells by staurosporine, a potent protein kinase C inhibitor. Leuk Res 1990; 14:467-74. [PMID: 2140592 DOI: 10.1016/0145-2126(90)90034-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
THP-1 is a factor-indepencent, monocytic leukemia cell line which differentiates into adherent macrophages upon treatment with 12-O-tetra-decanoylphorbol-13-acetate (TPA). Unlike its normal counterparts, THP-1 cells display only minimal levels of proto-oncogene c-FMS RNA which encode for membrane M-CSF receptors. Northern blot analysis showed that the c-FMS mRNA levels in THP-1 cells was greatly enhanced during TPA-induced monocytic differentiation. Despite the acquisition of functional activities and induction of c-FMS transcripts after TPA treatment, no surface M-CSF receptors were detected on the THP-1 cells. The inducing activity associated with TPA was completely abrogated when THP-1 cells were pretreated with staurosporine, a potent protein kinase C (PK-C) inhibitor. It is concluded that the activation of the PK-C system is a part of the metabolic cascade essential for the initiation of monocytic differentiation in THP-1 cells.
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319
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Blum S, Mueller M, Schmid SR, Linder P, Trachsel H. Translation in Saccharomyces cerevisiae: initiation factor 4A-dependent cell-free system. Proc Natl Acad Sci U S A 1989; 86:6043-6. [PMID: 2668952 PMCID: PMC297771 DOI: 10.1073/pnas.86.16.6043] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Yeast Saccharomyces cerevisiae genes TIF1 and TIF2 (translation initiation factor) encode a protein tentatively called translation initiation factor (Tif) due to the similarity of its amino acid sequence and its molecular weight to mammalian eukaryotic initiation factor 4A. To clarify whether Tif is involved in translation, we produced an affinity-purified anti-Tif antibody by using Tif isolated from a Tif-overproducing yeast strain as immunogen and an Escherichia coli strain expressing Tif from an expression vector to provide the extract for affinity purification of the antibody. By using chromatographic procedures and the affinity-purified anti-Tif antibody as probe to identify Tif-containing fractions, we purified Tif from wild-type yeast cells. When yeast cells containing the only TIF1 gene on a plasmid under the control of the galactose-inducible CYC1-GAL10 promoter were grown in medium containing glucose as the carbon source, the production of Tif was shut off and growth was arrested. Lysates made from these cells were inactive in in vitro translation. Addition of Tif to these lysates restored in vitro protein synthesis. These results show that Tif is a translation factor, the yeast homologue of mammalian translation initiation factor 4A.
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320
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Mueller M. The image of nursing. NEBRASKA NURSE 1989; 22:4-5. [PMID: 2927574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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321
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Chen BD, Mueller M, Olencki T. Interleukin-3 (IL-3) stimulates the clonal growth of pulmonary alveolar macrophage of the mouse: role of IL-3 in the regulation of macrophage production outside the bone marrow. Blood 1988; 72:685-90. [PMID: 3261184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Interleukin-3 (IL-3) is one of the hematopoietic growth factors that regulates the growth and differentiation of pluripotent stem cells, thereby leading to the production of all the major blood cell types. The role of IL-3 in the regulation of pulmonary alveolar macrophage (PAM) production was investigated. IL-3 stimulated the proliferation and clonal growth of murine PAM with a dose-response curve similar to that of bone marrow granulocyte-macrophage colony-forming cells. The IL-3-induced colony formation by cells outside the bone marrow appeared to be unique to PAM; IL-3 failed to cause colony formation by both peritoneal exudate macrophages (PEM) and blood monocytes. Unlike bone marrow stem cells, PAM are unipotential and in vitro gave rise to only mononuclear phagocytes under the influence of IL-3. Nevertheless, cells derived from PAM cultures in media containing IL-3 displayed a high degree of heterogeneity in terms of their Fc receptor-mediated phagocytic activity. At low concentrations, IL-3 induced a synergistic response with colony-stimulating factor 1 (CSF-1), which resulted in an enhanced proliferative capacity of PAM. A synergistic effect was also observed by short-term exposure of PAM to IL-3 followed by incubating with CSF-1 alone. This study shows that IL-3 exhibited a macrophage growth factor activity unique to PAM.
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322
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Chen BD, Mueller M, Chou TH. Role of granulocyte/macrophage colony-stimulating factor in the regulation of murine alveolar macrophage proliferation and differentiation. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1988; 141:139-44. [PMID: 3288696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Granulocyte/macrophage (GM)-CSF is one of the hemopoietic growth factors that stimulates neutrophilic granulocyte and macrophage production by bone marrow progenitor cells. In this study, the effect of GM-CSF on the growth and differentiation of murine pulmonary alveolar macrophages (PAM) was investigated. In the presence of GM-CSF, normal murine PAM were induced to proliferate and develop into macrophage colonies with a dose-response curve similar to that of bone marrow GM colony-forming cells. PAM also responded to CSF-1, a lineage-restricted growth factor, but required much higher doses of CSF-1 and a longer incubation time for optimal colony formation. The proliferative response of PAM to CSF-1, however, was greatly enhanced by the concurrent addition of low doses of GM-CSF. In contrast, low doses of CSF-1 failed to potentiate the proliferative response of PAM to GM-CSF. Macrophages derived from GM-CSF cultures were rounder and less stretched and possessed less FcR-mediated phagocytic activity than cells produced in CSF-1 cultures. A study with hydrocortisone-induced monocytopenia showed that nearly one half of lung macrophages may be sustained by local proliferation of PAM without the continuous migration of blood monocytes. This study suggests that GM-CSF may play a major role in the production of PAM by two modes of action, 1) direct stimulation of cell proliferation and 2) enhancement of their responsiveness to CSF-1, thereby producing more mature and functionally competent macrophages.
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Chen BD, Mueller M, Chou TH. Role of granulocyte/macrophage colony-stimulating factor in the regulation of murine alveolar macrophage proliferation and differentiation. THE JOURNAL OF IMMUNOLOGY 1988. [DOI: 10.4049/jimmunol.141.1.139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract
Granulocyte/macrophage (GM)-CSF is one of the hemopoietic growth factors that stimulates neutrophilic granulocyte and macrophage production by bone marrow progenitor cells. In this study, the effect of GM-CSF on the growth and differentiation of murine pulmonary alveolar macrophages (PAM) was investigated. In the presence of GM-CSF, normal murine PAM were induced to proliferate and develop into macrophage colonies with a dose-response curve similar to that of bone marrow GM colony-forming cells. PAM also responded to CSF-1, a lineage-restricted growth factor, but required much higher doses of CSF-1 and a longer incubation time for optimal colony formation. The proliferative response of PAM to CSF-1, however, was greatly enhanced by the concurrent addition of low doses of GM-CSF. In contrast, low doses of CSF-1 failed to potentiate the proliferative response of PAM to GM-CSF. Macrophages derived from GM-CSF cultures were rounder and less stretched and possessed less FcR-mediated phagocytic activity than cells produced in CSF-1 cultures. A study with hydrocortisone-induced monocytopenia showed that nearly one half of lung macrophages may be sustained by local proliferation of PAM without the continuous migration of blood monocytes. This study suggests that GM-CSF may play a major role in the production of PAM by two modes of action, 1) direct stimulation of cell proliferation and 2) enhancement of their responsiveness to CSF-1, thereby producing more mature and functionally competent macrophages.
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Mueller M, Sartorelli K, DeMeules JE, Gamelli RL. Effects of fluid resuscitation on cardiac dysfunction following thermal injury. J Surg Res 1988; 44:745-53. [PMID: 3379951 DOI: 10.1016/0022-4804(88)90110-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
To test the hypothesis that low cardiac output in burns is secondary to hypovolemia, the effects of resuscitation on isovolumic contracting rat heart following a full-thickness burn were studied. Sprague-Dawley rats were randomly assigned into three groups: (1) Sham burn, (2) 30% body surface area burn nonresuscitated, (3) 30% body surface area burn with 15 cc Ringer's lactate/180 g body wt ip at the time of burn resuscitated. Twenty hours postburn, the hearts were mounted on a Lagendorff perfusion apparatus. A balloon-tipped catheter placed in the left ventricle measured pressure and dp/dt. Coronary flow was determined. Myocardial samples for ATP and water were obtained. Left ventricular function was evaluated by recording peak systolic pressure, end diastolic pressure, and maximum +/- dp/dt while balloon volume was increased to 0.3 cc. Results are with end diastolic volume constant at 0.15 cc. Compared to sham burn, burn nonresuscitated generated lower peak systolic pressure +/- dp/dt and higher end diastolic pressure while hearts from burn resuscitated generated the same as sham burn. Coronary flow and tissue water content was similar in all. ATP content was lower in burn nonresuscitated. Our data support that impaired systolic and diastolic function in burn nonresuscitated hearts is associated with lower ATP levels not seen in burn resuscitated and reperfusion of burn nonresuscitated hearts does not reverse the myocardial depressant effect.
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Marti R, Wild P, Schraner EM, Mueller M, Moor H. Parathyroid ultrastructure after aldehyde fixation, high-pressure freezing, or microwave irradiation. J Histochem Cytochem 1987; 35:1415-24. [PMID: 3680934 DOI: 10.1177/35.12.3680934] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Parathyroid cell variants, commonly observed in parathyroid glands fixed by immersion in glutaraldehyde, are believed to be the result of cyclic changes in the course of parathyroid hormone secretion. Immersion of bovine parathyroid glands in a mixture consisting of 1% glutaraldehyde, 1.5% formaldehyde, and 2.5% acrolein, followed by post-fixation in 1% osmium tetroxide, resulted in high uniformity with only one cell variant, whereas the same fixation procedure led to disruption of cell membranes and formation of cell variants in rat parathyroids. Parathyroid glands of both cattle and rats prepared by high-pressure quick-freezing and subsequent freeze-substitution contained only one cell variant. Excellent preservation of the ultrastructure of bovine and rat parathyroids, also exhibiting only one cell variant, was achieved by microwave irradiation in the presence of 2.5% glutaraldehyde in Na-cacodylate followed by post-fixation with OsO4 in Na-cacodylate or s-collidine, both containing Ca2+ and Mg2+. Use of the appropriate buffer, as well as osmication, is essential for successful fixation utilizing microwave energy. The main effects are considered to be heating specimens within sufficient short periods and enhancement of subsequent osmium fixation. The results support the idea, arising after examination of perfusion-fixed parathyroid tissue, that parathyroid cell variants occur during improper aldehyde fixation rather than that they express functional diversity.
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Olney JW, Price MT, Labruyere J, Salles KS, Frierdich G, Mueller M, Silverman E. Anti-parkinsonian agents are phencyclidine agonists and N-methyl-aspartate antagonists. Eur J Pharmacol 1987; 142:319-20. [PMID: 2826182 DOI: 10.1016/0014-2999(87)90123-3] [Citation(s) in RCA: 95] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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327
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Mueller M. [A health pilot-study at the orientation circle]. KRANKENPFLEGE. SOINS INFIRMIERS 1987; 80:44-5. [PMID: 3650577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Siems W, Mueller M, Garbe S, Gerber G. Damage of erythrocytes by activated oxygen generated in hypoxic rat liver. FREE RADICAL RESEARCH COMMUNICATIONS 1987; 4:31-9. [PMID: 3506895 DOI: 10.3109/10715768709088086] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The implication of activated oxygen in the interaction between hypoxic rat liver and circulating erythrocytes was investigated. Reduced species of oxygen generated in hypoxic liver owing to accelerated purine nucleotide degradation via xanthine oxidase initiate alterations of plasma membrane and glutathione system of erythrocytes. Osmotic fragility, hemolysis rate and erythrocytic GSSG:GSH ratio may be considered as appropriate indicators of oxidative load in liver and other tissues. Addition of erythrocytes to the perfusion medium attenuates the GSSG efflux of hypoxic liver from 2.7 +/- 0.5 nmol x g w.w.-1 x min-1 to 1.4 +/- 0.2 nmol x g w.w.-1 x min-1 Thus, circulating erythrocytes protect the liver against oxidative attack.
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Bujard H, Gentz R, Lanzer M, Stueber D, Mueller M, Ibrahimi I, Haeuptle MT, Dobberstein B. A T5 promoter-based transcription-translation system for the analysis of proteins in vitro and in vivo. Methods Enzymol 1987; 155:416-33. [PMID: 2828874 DOI: 10.1016/0076-6879(87)55028-5] [Citation(s) in RCA: 212] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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331
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Abstract
Cytochrome-c oxidase of bovine heart mitochondria was depleted of copper A by dialysis against 1 M KCN in the presence of dodecylmaltoside. There was no difference of the pH-dependence of the midpoint potential between the intact and the copper-depleted enzyme. Oxidation of reduced cytochrome a2+a3(3+).CN complex released about 1 proton/electron in the medium at pH 7.6. This release was inhibited by N,N'-dicyclohexylcarbodiimide. Again there was no difference between the intact and Cu-depleted enzyme. This limits the role of copper A in the mechanism of the proton pump. On the other hand, these experiments showed that cytochrome a could be a component of the proton pump.
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332
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Bhattacharya A, Mueller M, Putz-Anderson V. Traumatogenic factors affecting the knees of carpet installers. APPLIED ERGONOMICS 1985; 16:243-250. [PMID: 15676556 DOI: 10.1016/0003-6870(85)90087-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
An ergonomics analysis of carpet installation tasks was performed. The purpose was to identify and quality potential sources of biomechanical trauma that may be responsible for the high rates of knee morbidity found by previous researchers among carpet layers. Nine carpet layers were studied either at an apartment building worksite or at a training school. Results from a job analysis indicated that workers spent approximately 75% of their time in the kneeling position using a tool called a knee-kicker to stretch and install carpet. Awkward body postures were identified from films of workers installing carpets. At the moment of impact the knee is severely flexed, subtended angles were less than 60 degrees. To obtain measures of impact force on the knee, the kicker-tool was instrumented with a load cell. Workers who executed the hardest kicks with the tool produced impact peak forces that averaged 3019 newtons (N), which is equivalent to about four times body weight. Measures from an accelerometer attached to the worker's knee showed values in excess of 120 m/s(2), which are comparable to those found during vigorous running and jumping exercises. The results imply that repetitive impact of the knee joint from the use of the knee-kicker combined with knee flexion, kneeling and squatting may be responsible for the high level of occupational knee-morbidity found among carpet layers.
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333
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Hannon JP, Trammell GT, Mueller M, Gerdau E, Rüffer R, Winkler H. Grazing-incidence antireflection films. III. General theory for pure nuclear reflections. PHYSICAL REVIEW. B, CONDENSED MATTER 1985; 32:6363-6373. [PMID: 9936739 DOI: 10.1103/physrevb.32.6363] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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334
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Hannon JP, Trammell GT, Mueller M, Gerdau E, Rüffer R, Winkler H. Grazing-incidence antireflection films. IV. Application to Mössbauer filtering of synchrotron radiation. PHYSICAL REVIEW. B, CONDENSED MATTER 1985; 32:6374-6384. [PMID: 9936740 DOI: 10.1103/physrevb.32.6374] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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335
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Hannon JP, Hung NV, Trammell GT, Gerdau E, Mueller M, Rüffer R, Winkler H. Grazing-incidence antireflection films. I. Basic theory. PHYSICAL REVIEW. B, CONDENSED MATTER 1985; 32:5068-5080. [PMID: 9937715 DOI: 10.1103/physrevb.32.5068] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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336
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Hannon JP, Hung NV, Trammell GT, Gerdau E, Mueller M, Rüffer R, Winkler H. Grazing-incidence antireflection films. II. Alternate techniques and general multilayer theory. PHYSICAL REVIEW. B, CONDENSED MATTER 1985; 32:5081-5092. [PMID: 9937716 DOI: 10.1103/physrevb.32.5081] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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337
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Käppeli O, Walther P, Mueller M, Fiechter A. Structure of the cell surface of the yeast Candida tropicalis and its relation to hydrocarbon transport. Arch Microbiol 1984; 138:279-82. [PMID: 6477032 DOI: 10.1007/bf00410890] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The surface structure of the hydrocarbon-utilizing yeast Candida tropicalis was investigated by scanning and transmission electron microscopy (SEM and TEM respectively). The sample preparation technique was based on a rapid cryofixation without any addition of cryoprotectants. In subsequently freeze-dried samples the surface structure was analysed by scanning electron microscopy. Thin sections were prepared from freeze substituted samples. Both techniques revealed hair-like structures at the surface of hydrocarbon-grown cells. The hairy surface structure of the cells was less expressed in glucose-grown cells and it was absent completely after proteolytic digestion of the cells. When cells were incubated with hexadecane prior to cryofixation a contrast-rich region occurred in the hair fringe of thin sections as revealed by TEM. Since these structures were characteristic for hexadecane-grown cells and could not be detected in glucose-grown or protease-treated cells it was concluded that they originate from hexadecane adhering to the cell surface and are functionally related to hexadecane transport. The structure of the surface and its relation to hydrocarbon transport are discussed in view of earlier results on the chemical composition of the surface layer of the cell wall.
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Hunziker EB, Herrmann W, Schenk RK, Mueller M, Moor H. Cartilage ultrastructure after high pressure freezing, freeze substitution, and low temperature embedding. I. Chondrocyte ultrastructure--implications for the theories of mineralization and vascular invasion. J Biophys Biochem Cytol 1984; 98:267-76. [PMID: 6707090 PMCID: PMC2113010 DOI: 10.1083/jcb.98.1.267] [Citation(s) in RCA: 172] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Electron microscopic examination of epiphyseal cartilage tissue processed by high pressure freezing, freeze substitution, and low temperature embedding revealed a substantial improvement in the preservation quality of intracellular organelles by comparison with the results obtained under conventional chemical fixation conditions. Furthermore, all cells throughout the epiphyseal plate, including the terminal chondrocyte adjacent to the region of vascular invasion, were found to be structurally integral. A zone of degenerating cells consistently observed in cartilage tissue processed under conventional chemical fixation conditions was not apparent. Hence, it would appear that cell destruction in this region occurs during chemical processing and is not a feature of cartilage tissue in the native state. Since these cells are situated in a region where tissue calcification is taking place, the implication is that the onset and progression of cartilage calcification are, at least partially, controlled by the chondrocytes themselves. The observation that the terminal cell adjacent to the zone of vascular invasion is viable has important implications in relation to the theory of vascular invasion. This may now require reconceptualization to accommodate the possibility that active cell destruction may be a precondition for vascular invasion.
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Mueller M, Bernstein I, Thompson A. Recovery behavior of hydrogen charged 7075-T6 Aluminum. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/0036-9748(83)90447-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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340
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Pederson R, O'Dorisio T, Howe B, McIntosh C, Mueller M, Brown J, Cataland S. Vagal release of IR-VIP and IR-gastrin from the isolated perfused rat stomach. Mol Cell Endocrinol 1981; 23:225-31. [PMID: 7274550 DOI: 10.1016/0303-7207(81)90072-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The effects of electrical stimulation of the vagus at varying pulse widths on the release of immunoreactive VIP (IR-VIP) and IR-gastrin have been investigated, using the isolated perfused rat stomach preparation. Electrical stimulation of vagal trunks at a pulse width of 0.1 msec duration yielded no change in basal IR-VIP levels whereas a pulse width of 5.0 msec produced a prompt sustained increase. Stimulation at either pulse width evoked gastrin release. Atropine blocked the vagal release of IR-gastrin but not IR-VIP whereas hexamethonium blocked both responses. Exogenously administered porcine VIP, at concentrations mimicking endogenously released levels, was used in an attempt to reproduce the effects observed by vagal stimulation. Exogenous VIP had no effect on gastrin or somatostatin-like immunoreactivity (SLI) release. These in vitro studies support a role for VIP as a neurotransmitter released from the stomach by low-threshold non-cholinergic vagal fibres, but involving autonomic ganglia.
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341
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Cogoli A, Valluchi-Morf M, Mueller M, Briegleb W. Effect of hypogravity on human lymphocyte activation. AVIATION, SPACE, AND ENVIRONMENTAL MEDICINE 1980; 51:29-34. [PMID: 7362543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Cultures of human lymphocytes were exposed to the mitogen concanavalin A in a low-G environment generated by a fast rotating clinostat. DNA-synthesis was determined by incorporation of 3H-thymidine as the parameter for activation, cell ultrastructure was analyzed by electron microscopy, and cell movements were recorded by a cinecamera. The results were compared with 1-G controls. The cells cultured at low G show: (i) depression of activation by 50%, (ii) appearance of "mitochondria-rich" cells, and (iii) enhanced formation of pseudovilli and uropods. Our investigations in vitro at low and high G and reports on the effect of spaceflights on lymphocytes from cosmonauts and astronauts suggest that hypogravity depresses, whereas hypergravity enhances, lymphocyte activation by mitogens. This study is complementary to an experiment which will study the in vitro activation of lymphocytes in weightlessness during the first Spacelab mission.
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342
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Mueller M, Burchard W. Fibrinogen-fibrin transformations characterized during the course of reaction by their intermediate structures. A light scattering study in dilute solution under physiological conditions. BIOCHIMICA ET BIOPHYSICA ACTA 1978; 537:208-25. [PMID: 728446 DOI: 10.1016/0005-2795(78)90505-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Intermediate structures of human fibrin formed under physiological conditions were investigated by means of light scattering in the course of the polymer/network formation. Very low fibrinogen concentrations (c = 0.03--0.13 mg/ml) were used to lower the polymerization rate, and thrombin at five concentrations (0.0085--0.04 N.I.H./ml) was used for initiation. The light scattering data were evaluated from (i) a Zimm plot, (ii) a Holtzer plot, i.e., hRtheta/Kc vs. h2, and (iii) a Kratky plot, i.e., h2Rtheta/KC vs. h2. In the beginning of the polymerization process rod-like structures are formed. The dimensions of the rod-like monomeric unit in the fibrin polymer are 112 X 3.9 nm and agree with the dimensions of fibrinogen, which also was found to be a thin rod of 105 +/- 10 nm length and 3.9 nm diameter. The mass per unit length, obtained from the asymptote in the Holtzer plot, initially increases only slightly but for high thrombin concentrations increases steeply when a critical length of 1000 nm is exceeded. At this point also the total scattering behaviour changes considerably. The upturn in the Zimm plot and the occurrence of a maximum in the Kratky plot are clear indications for the onset of branching. At low thrombin concentrations the kink in the curve of Mw/Lw against Mw becomes smoothed out because of nonspecific side-by-side aggregation of fibrin strands. The results are discussed and compared with earlier findings by others, and lead to the following conclusions. (i) Fibrinogen is a polymer with some flexibility and can exist in conformations of a stretched rod 105 nm in length, a folded rod of 45 nm in length, and a banana-like conformation of 94 nm circumference. (ii) Under the conditions of the present work, fibrinogen has the thin stretched rod conformation, and has the same dimensions as the repeating unit in the fibrin polymer. (iii) After approx. 10--12 units, end-to-end aggregated monomer branching occurs. (iv) The end-to-end aggregation is promoted by the cleavage of A peptides, branching is caused by the cleavage of B peptides while side-by-side aggregation of strands is caused by nonspecific van der Waals interaction.
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Leffert H, Moran T, Sell S, Skelly H, Ibsen K, Mueller M, Arias I. Growth state-dependent phenotypes of adult hepatocytes in primary monolayer culture. Proc Natl Acad Sci U S A 1978; 75:1834-8. [PMID: 77017 PMCID: PMC392435 DOI: 10.1073/pnas.75.4.1834] [Citation(s) in RCA: 100] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A proliferation-competent adult rat liver cell monolayer system has been analyzed for tissue-specific functions during its growth cycle. High levels of the adult (L type) form of pyruvate kinase (EC 2.7.1.40) and glutathione S-transferase B ("ligand," EC 2.5.1.18) are observed during the early lag phase; they decline markedly during the logarithmic phase and reappear during the stationary phase. By contrast, elevated levels of the fetal (K type) form of pyruvate kinase and alpha1-fetoprotein production appear only after proliferation begins; this pattern diminishes slightly during stationary phase as the adult phenotype is restored. Albumin production continues throughout the entire growth cycle. These in vitro findings simulate those observed during hepatoproliferative transitions in the intact animal and, as such, constitute a developmental program for normal epithelial cells in primary culture.
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345
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Apstein CS, Mueller M, Hood WB. Ventricular contracture and compliance changes with global ischemia and reperfusion, and their effect on coronary resistance in the rat. Circ Res 1977; 41:206-17. [PMID: 872295 DOI: 10.1161/01.res.41.2.206] [Citation(s) in RCA: 90] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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346
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Apstein CS, Deckelbaum L, Mueller M, Hagopian L, Hood WB. Graded global ischemia and reperfusion. Cardiac function and lactate metabolism. Circulation 1977; 55:864-72. [PMID: 870244 DOI: 10.1161/01.cir.55.6.864] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The effect of global ischemia of different degrees of severity and reperfusion was studied in the isolated working rat heart. Four degrees of ischemia were induced by reducing the control total coronary flow of 8 ml/min to 0, 0.04, 0.4, or 0.8 ml/min for 30 minutes, after which the coronary flow was returned to the control level. After severe ischemia (0 and 0.04 ml/min ischemic coronary flow groups), recovery of contractility was to less than 30% of the control, pre-ischemic value of ventricular developed pressure and dP/dt, and irreversible cardiac contracture and an increased pacing threshold occurred. After moderate ischemia (0.4 and 0.8 ml/min ischemic coronary flow groups), contractile function recovered completely, ischemic contracture was rapidly reversible and the pacing threshold did not increase. The moderately ischemic groups were able to function at a stable, low level of contractility for the 30 minute ischemic period, whereas the severely ischemic groups had no contractile activity. The amount of calculated tissue lactate accumulation correlated with the occurrence of irreversible ischemic injury; the severely ischemic groups which failed to recover with reperfusion accumulated 3-5 times as much lactate as the moderately ischemic groups which recovered completely. The results suggest that relatively small differences in the severity of the ischemic condition can markedly affect the degree of tissue injury.
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347
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Roerig DL, Lewand D, Mueller M, Wang RI. Methods of identification and confirmation of abusive drugs in human urine. J Chromatogr A 1975; 110:349-59. [PMID: 1150842 DOI: 10.1016/0021-9673(75)85016-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A thin-layer chromatography (TLC) procedure is described to be used as the initial drug detection method for urine surveillance in a drug abuse treatment program. While the TLC method is sufficiently sensitive, it is prone to false-positive results. For this reason, two other drug detection methods (gas-liquid chromatography and radioimmunoassay) have been incorporated to confirm positive results obtained with TLC. The combined methodologies result in a urine surveillance procedure that is versatile, sensitive and highly reliable.
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348
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Smith RB, Balchius D, Mueller M. Comparative use of alcohol and chlorpromazine by experimentally stressed CF-1 mice. THE MEDICAL ANNALS OF THE DISTRICT OF COLUMBIA 1972; 41:619-21. [PMID: 4507108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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349
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Matthews D, Swanson J, Mueller M, Stucky G. Additions and Corrections: Bonding and Valence Electron Distributions in Molecules. An X-Ray and Neutron Diffraction Study of the Crystal and Molecular Structure of Tetracyanoethylene Oxide. J Am Chem Soc 1972. [DOI: 10.1021/ja00762a601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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350
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Yegian CD, Mueller M, Selzer G, Russo V, Stahl FW. Properties of the DNA-delay mutants of bacteriophage T4. Virology 1971; 46:900-19. [PMID: 4944864 DOI: 10.1016/0042-6822(71)90090-0] [Citation(s) in RCA: 79] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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