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Rick W, Hockeborn M. [Determination of the activity of lipase with the so-called turbidimetric test]. JOURNAL OF CLINICAL CHEMISTRY AND CLINICAL BIOCHEMISTRY. ZEITSCHRIFT FUR KLINISCHE CHEMIE UND KLINISCHE BIOCHEMIE 1982; 20:735-44. [PMID: 7142913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Rick W, Hockeborn M. [Determination of lipase with 8-phenyloctanoic acid vinyl ester as the substrate]. JOURNAL OF CLINICAL CHEMISTRY AND CLINICAL BIOCHEMISTRY. ZEITSCHRIFT FUR KLINISCHE CHEMIE UND KLINISCHE BIOCHEMIE 1982; 20:627-632. [PMID: 7142919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The UV-test described by Myrick ((1976) Ph. D. Thesis, Birmingham, AL, USA) for the determination of the catalytic activity of lipase in serum, using 8-phenyloctanoic acid vinyl ester as substrate, was investigated in detail. When tested with sera the assay gave unsatisfactory linearity. For some serum samples, evaluation was impossible, owing to the complete lack of a linear response. The substrate is attacked not only by purified pancreatic lipase, but also by liver esterase, cholinesterase in plasma, and lipoproteinlipase. Attempts to inhibit the interfering esterases with phenylmethylsulphonylfluoride were unsuccessful. Analyses of 102 sera showed no correlation with the results from the titrimetric assay (r = 0.158). Thus the method of Myrick does not provide clinically useful results.
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Rick W, Hockeborn M. [Determination of lipase catalytic activity with 2,3-dimercapto-1-propanol-tributyrate as substrate]. JOURNAL OF CLINICAL CHEMISTRY AND CLINICAL BIOCHEMISTRY. ZEITSCHRIFT FUR KLINISCHE CHEMIE UND KLINISCHE BIOCHEMIE 1982; 20:537-52. [PMID: 6897262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The two point test for the determination of lipase by Kurooka et al. (J. Biochem. Tokyo 81, 361-369 (1977)) was studied in detail. This procedure uses 2,3-dimercapto-1-propanol-tributyrate as substrate and Ellman's reagent as an acceptor for the released thiol groups. The time course of the enzymic hydrolysis of the substrate showed a pronounced lag phase, which can be influenced by sodium glycocholate. There is no proportionality between the quantity of added serum and the concentration of released thiol groups. Preincubation of the sample with the esterase inhibitor, phenylmethylsulphonylfluoride, as recommended by the authors, does not completely inhibit the serum esterase activity. The action of sodium dodecyl sulphate, which is included in the system, is not explained; in the continuous titrimetric test with triolein as substrate, it acts as a powerful lipase inhibitor. Using 104 serum samples, significant differences were found between the results from this method and those obtained by the titrimetric determination of lipase. Possible fundamental improvements of this test system, using thioesters as substrate, are discussed.
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Strauss P, Herrig M, Rick W, Fassbender-Balg S. [Inner ear and diabetes mellitus experimental streptocotocin diabetes in rats]. LARYNGOLOGIE, RHINOLOGIE, OTOLOGIE 1982; 61:319-24. [PMID: 6981745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The histological changes in the inner ear were compared with the hearing ability in insulin deficiency diabetes of rats. 38 LEW-Han-rats were treated with streptocotocin; 34 of these became diabetic, as proved by the glucose tolerance test. 22 rats served as controls. The diabetes was not treated. For a period of up to 440 days the weight, blood glucose and auditory function were controlled in the living animals. Auditory function was tested by means of pinnal reflex of Preyer for a frequency range between 1000 and 20000 cps. With regard to the mean values of frequency, neither a decrease nor a difference between normal controls and diabetic rats was found to any substantial degree. Histological examinations of sacrificed diabetic rats meanwhile showed the well-known changes in the kidneys with microaneurism, thickened basal lamina, mesangial proliferation, and hyaline bodies. The changes in the inner ear, especially in the region of the stria vascularis and lamina spiralis ossea to the ganglion cochleae, were rather discrete, so that no pronounced diminution of the auditory function as a result of restricted metabolism was to be expected. A loss of ganglion cells was seen in the spiral ganglion of the cochlea in correlation with ageing. There was no clear difference between diabetic rats and normal controls. Insulin deficiency diabetes causes severe changes in the vessels, as demonstrated in the kidney. In the inner ear, however, there were no comparable changes, the hearing ability of diabetic rats remaining practically normal.
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Strauss P, Schmittner S, Rick W, Fassbender-Balg S. [Inner ear and diabetes mellitus diabetic mutant mice]. LARYNGOLOGIE, RHINOLOGIE, OTOLOGIE 1982; 61:325-30. [PMID: 7121152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
We observed the course of diabetes in 23 genetically diabetic mice (C 57 BL/KSJ mdb) and in 25 controls (C 57 BL/KSJ). Diabetes was not treated. Histological changes of pancreas, aorta, kidneys, and inner ear vessels were noted. Auditory function was tested by means of the pinnal reflex of Preyer for a frequency range between 4000 and 20000 cps. The diabetic mice developed partly a mild diabetes associated with weight gain, and partly a severe diabetes with a loss of weight. Histologically, the diabetic mice showed (dependent on the duration and degree of severity of the diabetes) progressive mesangial sclerosis and thickening of basal laminas of the glomerula, as well as progressive slight to moderate thickening of the vascular walls of all inner ear vessels. The hearing ability of diabetic mice and of controls diminished with age to a comparable degree. The diabetic mice showed a slightly higher hearing loss for high frequencies, which did not correlate with the extent of thickening of inner ear vessel walls.
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Strauss P, Herrig M, Rick W, Faßbender-Balg S. Der Einfluß des Diabetes mellitus auf das Hörorgan - Teil A: Experimenteller Streptozotocin-Diabetes bei der Ratte*. Laryngorhinootologie 1982. [DOI: 10.1055/s-2007-1008584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Hockeborn M, Rick W. Zur Bestimmung der katalytischen Aktivität der Lipase mit dem kontinuierlichen titrimetrischen Test. Clin Chem Lab Med 1982. [DOI: 10.1515/cclm.1982.20.11.773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Rick W, Hockeborn M. Zur Bestimmung der katalytischen Aktivität der Lipase mit 8-Phenyloctansäure-vinylester als Substrat. Clin Chem Lab Med 1982. [DOI: 10.1515/cclm.1982.20.9.627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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34
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Rick W, Hockeborn M. Zur Bestimmung der katalytischen Aktivität der Lipase mit 2,3-Dimercapto-1-propanol-tributyrat als Substrat. Clin Chem Lab Med 1982. [DOI: 10.1515/cclm.1982.20.8.537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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35
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Rick W, Hockeborn M. Zur Bestimmung der Aktivität der Lipase mit dem sogenannten turbidimetrischen Test. Clin Chem Lab Med 1982. [DOI: 10.1515/cclm.1982.20.10.735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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36
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Rick W, Hockeborn M. Zur Bestimmung der katalytischen Aktivität der Lipase mit Trilinolein als Substrat. Clin Chem Lab Med 1982. [DOI: 10.1515/cclm.1982.20.10.745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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37
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Hockeborn M, Rick W. Ermittlung der katalytischen Aktivität der Lipase im Serum durch Messung bzw. Schätzung des pH-Abfalls in einer Triolein-Emulsion. Clin Chem Lab Med 1982. [DOI: 10.1515/cclm.1982.20.12.921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Hoppe B, Fritsch WP, Scholten T, Rick W, Strohmeyer G. [Comparison of the effects of natural and synthetic secretin on the exocrine secretion of the human pancreas (author's transl)]. ZEITSCHRIFT FUR GASTROENTEROLOGIE 1980; 18:625-32. [PMID: 7281853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In 16 healthy male subjects the effects of natural and synthetic secretin on the function of the exocrine pancreas were compared. Following; stimulation with secretin in all cases pancreozymin was injected to ascertain normal pancreatic secretory capacity. The methods applied corresponded to those used in the multicenter study of the European Pancreatic Club. No significant differences were found between the results concerning volume of secretion, maximal bicarbonate concentration, maximal bicarbonate output and enzyme secretion rates after stimulation with natural and synthetic secretin, respectively. It is concluded that the synthetic peptide can be utilized in the same way as the natural product in the secretin-pancreozymin-test.
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Fritsch WP, Scholten T, Hausamen TU, Rick W. [Effects of pentagastrin and heptagastrin on acid secretion in man (author's transl)]. ZEITSCHRIFT FUR GASTROENTEROLOGIE 1980; 18:256-64. [PMID: 7434853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Gastrin analogues are known to stimulate acid secretion with higher potency the more amino acids prolong the peptid chain towards the N-terminal end. In order to compare the response of pentagastrin (Gastrodiagnost, Merck, Darmstadt) and Heptagastrin (HOE 293, Hoechst AG, Frankfurt/M.) in 12 healthy subjects the two peptides were given subcutaneously in doses of 1 microgram/kg, 3 microgram/kg and 6 microgram/kg body weight. Additionally in 8 subjects 1 microgram/kg/h and 2 microgram/kg/h of the gastrins were given intravenously. Gastric content was aspirated under basal and stimulated conditions in portions of 15 minutes, volume (ml) and acid concentration (meq/l) of each fraction was measured and acid secretion (meq/90'), BAO and PAO were calculated. As compared with pentagastrin the dose response curve was shifted to the left, when heptagastrin was given subcutaneously. The amount of acid secretion over a time period of 90 min. was about 17% higher after heptagastrin than after pentagastrin. There was no difference between the peak acid outputs (PAO). Stimulation of acid secretion was prolonged after heptagastrin as compared to pentagastrin. Both gastrins acted similarly on all parameters measured when administered intravenously. Side effects as nausea and dizziness were observed in two subjects of each group.
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Maar K, Boeminghaus F, Blaschke R, Rick W. [In vitro perfusion of so-called endoprothesis. An experimental study of incrustations on internal splinting plastic tubes (author's transl)]. Urologe A 1977; 16:302-7. [PMID: 906195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We have used the method of internal splinting of the ureter (endoprothesis) for the past ten years. Because we observed partial obstruction of the lumen by incrustations and/or fibrin coagula in cases in which the splints had been in place for long periods, we conducted in vitro experiments into the problem. Under constant and variable conditions, urine was perfused through plastic tubes of different materials. Organic and inorganic urine substances and urine pH were analyzed. The materials used were examined with special scanning electron microscopic techniques, and various depositions, especially in comparisons of in vivo and in vitro conditions, were found.
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Fritsch WP, Schacht U, Jacobs G, Scholten T, Rick W. [H+-secretion and serum gastrin in duodenal ulcer patients before and one year following proximal selective vagotomy]. VERHANDLUNGEN DER DEUTSCHEN GESELLSCHAFT FUR INNERE MEDIZIN 1977; 83:429-32. [PMID: 25533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Würzburg U, Hennrich N, Orth HD, Lang H, Prellwitz W, Neumeier D, Knedel M, Rick W. Quantitative determination of creatine kinase isoenzyme catalytic concentrations in serum using immunological methods. JOURNAL OF CLINICAL CHEMISTRY AND CLINICAL BIOCHEMISTRY. ZEITSCHRIFT FUR KLINISCHE CHEMIE UND KLINISCHE BIOCHEMIE 1977; 15:131-7. [PMID: 859004 DOI: 10.1515/cclm.1977.15.1-12.131] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
For the determination of creatine kinase isoenzyme catalytic concentrations in serum two methods based on immunological reactions are presented: One method uses inhibiting antibodies, which selectively block the activity of creatine kinase M subunits ("Inhibition Test"). This test is used for routine measurements of creatine kinase MB catalytic concentration; Another method uses precipitating antibodies, which allows a quantitative differentiation of creatine kinase isoenzymes MM, MB and BB ("Precipitation Test"). This test is used as a control for the Inhibition Test for the possible presence of creatine kinase BB activities in doubtful cases. Procedures, specificity, correlation and application of these methods are discussed.
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Fritsch WP, Hausamen TU, Rick W. Gastric and extragastric gastrin release in normal subjects in duodenal ulcer patients, and in patients with partial gastrectomy (Billroth I). Gastroenterology 1976; 71:552-7. [PMID: 8356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
In 10 normal subjects, in 32 patients with duodenal ulcer (DU), and in 11 patients with partial gastrectomy (Billroth I), serum gastrin rose significantly after an oral and intraduodenal test meal. The highest increases were observed in DU patients after the oral as well as after the intraduodenal test meal. After the intraduodenal test meal in 4 normal subjects and in 17 DU patients an increase of gastric acid secretion and serum gastrin was measured. In basal state, after an intraduodenal or an oral test meal, DU patients with normal gastric acid secretory capacity had higher serum gastrin concentrations than DU patients with gastric hypersecretion. There was a good correlation between peak serum gastrin levels after the oral and after the intraduodenal test meal. From these data it is concluded: (1) Intraduodenal application of a test meal results in release of gastrin from extragastric sites. (2) Extragastric gastrin is biologically active. (3) DU patients are able to release more antral and more extragastric gastrin in response to a test meal. Further studies, however, are necessary to show the significance of these findings in the pathogenesis of peptic ulcer disease.
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Rick W, Weiste HG. [Screening and rapid tests in diseases of exocrine pancreas]. Internist (Berl) 1976; 17:466-9. [PMID: 786936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Stolle D, Rick W. An improved method for the determination of creatine kinase activity in serum. Clin Chem Lab Med 1976; 14:239-44. [PMID: 8580 DOI: 10.1515/cclm.1976.14.1-12.239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An improved method for the determination of creatine kinase activity (EC 2.7.3.2) is described. For the reactivation of creatine kinase serum is first preincubated in the test solution in the presence of dithioerythritol. Then the enzymatic reaction is started by adding creatine phosphate. By optimizing the concentrations in the test solution and by altering the measurement procedure using dithioerythritol as reactivator, the assay is made more sensitive, and a far higher enzyme activity in serum is measured in comparison with other recommended tests. The reaction rate is linear for ten minutes up to 700 U/l. An increase in activity by enzyme dilution was not observed. In this study a sensitivity of detection of 0.9 U/l was achieved. This would be especially advantageous in the detection of the isoenzymes of creatine kinase after chromatography. Within-run precision was 1.2% (CV), day-to-day precision was 2.0% (CV). The test solution is stable for at least 24 hours.
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Scholten T, Fritsch WP, Hausamen TU, Rick W. [The regulation of gastric and extragastric release of gastrin]. DIE MEDIZINISCHE WELT 1976; 27:325-7. [PMID: 3714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Förster H, Lenschen J, Fritsch WP, Hausamen TU, Rick W. [Clinical significance of gamma glutamyl transpeptidase]. DIE MEDIZINISCHE WELT 1975; 26:1642-4. [PMID: 240997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Kleybrink H, Fritsch WP, Rick W, Hausamen TU. [Serum gastrin and H+secretion following vagus stimulation in normal persons and in patients with duodenal ulcer]. DIE MEDIZINISCHE WELT 1975; 26:1640-1. [PMID: 1177727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Rick W. [Proceedings: Normal values and samples of findings in gastrointestinal diseases]. MEDIZINISCHE KLINIK 1975; 70:1003. [PMID: 1207601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Rick W. [Proceedings: Normal ranges and pattern of findings in gastrointestinal tract diseases]. MMW, MUNCHENER MEDIZINISCHE WOCHENSCHRIFT 1975; 117:484-9. [PMID: 805954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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