101
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Souka AR, Rahman H, Osman M, Mohei Y, Rizk M. Hormonal profile in IUD users. Contracept Deliv Syst 1981; 2:303-10. [PMID: 12336991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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102
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Abstract
Fifty patients with rhinoscleroma have been studied clinically, histopathologically and bacteriologically before, during and after the local application of acriflavin solution, in different concentrations, over an eight-week period. The results have been encouraging. Local acriflavine solution, in a concentration of 2 per cent, has been shown to be an effective and safe remedy for rhinoscleroma.
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103
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Edwards DJ, Rizk M. Conversion of 3, 4-dihydroxyphenylalanine and deuterated 3, 4-dihydroxyphenylalanine to alcoholic metabolites of catecholamines in rat brain. J Neurochem 1981; 36:1641-7. [PMID: 6165806 DOI: 10.1111/j.1471-4159.1981.tb00414.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We have investigated the effects of 3, 4-dihydroxyphenylalanine (L-DOPA) and its deuterated analogue on the concentrations of alcoholic metabolites of catecholamines in rat brain by means of gas chromatography/mass spectrometry with selected-ion monitoring. Whole brain concentrations of the two neutral norepinephrine metabolites, 3-methoxy-4-hydroxyphenylethyleneglycol (MHPG) and 3, 4-dihydroxyphenylethyleneglycol (DHPG), were significantly increased in a dose-dependent manner by a single intraperitoneal injection of L-DOPA. Both MHPG and DHPG, as well as the corresponding dopamine metabolites, reached a maximum 1 h after injection. Brain MHPG and DHPG concentrations were elevated by 78 and 134%, respectively, 1 h after injection of 150 mg/kg L-DOPA. Analyses of discrete brain regions revealed that concentrations of the norepinephrine metabolites were elevated uniformly in all regions, except that MHPG showed a greater increase in the cerebellum than in other regions. The latter result appeared to be explained by the finding that 52% of the total MHPG in the cerebellum was unconjugated (compared to 15% in the whole brain). L-DOPA caused a proportionately greater increase in free MHPG than in total MHPG in the cerebellum and brain stem. By using deuterated L-DOPA in place of L-DOPA and measuring both the deuterated and nondeuterated norepinephrine metabolites, we demonstrated that virtually all of the increases in MHPG and DHPG were due to the conversion of the exogenous L-DOPA to norepinephrine. Thus, the effects of norepinephrine metabolism need to be considered in attempts to understand clinical and behavioral effects of L-DOPA.
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104
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Edwards DJ, Rizk M, Spiker DG. Effects of L-DOPA on the excretion of alcoholic metabolites of catecholamines and trace amines in rat and human urine. Biochem Med 1981; 25:135-48. [PMID: 6169341 DOI: 10.1016/0006-2944(81)90070-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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105
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106
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Toppozada M, Rizk M, Thabet MH, Shaala S. Uterine response to PGE2 with IUDs: a possible mechanism of action and side effect. Contracept Deliv Syst 1980; 1:349-63. [PMID: 12262137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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107
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Rizk M, Alslev T. [Nocturnal hypoglycemia]. Ugeskr Laeger 1980; 142:2346-7. [PMID: 7003870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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108
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Abstract
3-Methoxy-4-hydroxyphenylethyleneglycol (MHPG) was measured in 24-hour urine collections obtained from 44 drug-free patients hospitalized for a major depressive disorder, MHPG was significantly lower in a group of three biopolar 1 patients than in a group of unipolar patients. The excretion of MHPG did not significantly differ among patients classified as psychoatic, agitated, or retarded subtypes of depression as compared to patients not assigned to these subtypes.
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109
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Rizk M. [Transsphenoidal hypophysectomy]. Ugeskr Laeger 1980; 142:1615-7. [PMID: 7404762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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110
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El-dardiry N, El-kabarity H, El-sahwi S, El-fazzari A, Kira L, Rizk M, El-sewedy SM, Mostafa MH, Abdel-aal G, Saad AA. Biochemical and cytochemical changes of alpha-esterases activity in long-term oral contraceptive users. Bull Alexandria Fac 1980; 16:353-8. [PMID: 12263304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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111
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El-dardiry N, El-kabarity H, Maarei S, El-sahwi S, Kira L, Rizk M, El-sewedy SM, Mostafa MH, Saad AA, El-zoghby SM. Effect on prolonged use of oral contraceptive pills on the activity of serum and vaginal ribonuclease. Bull Alexandria Fac 1980; 16:359-65. [PMID: 12263305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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112
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Rizk M, Sørensen IM. [Vermiform appendiceal mucocele]. Ugeskr Laeger 1980; 142:1036-8. [PMID: 7385407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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113
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Edwards DJ, Rizk M, Neil J. Simultaneous analysis of phenylglycols and phenylethanols in human urine by gas chromatography-mass spectrometry. J Chromatogr 1979; 164:407-16. [PMID: 94330 DOI: 10.1016/s0378-4347(00)81544-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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114
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Edwards DJ, Rizk M. Identification and quantitation of phenylethylene glycol in human and rat urine, and its elevation in phenylketonuria. Clin Chim Acta 1979; 95:1-10. [PMID: 509720 DOI: 10.1016/0009-8981(79)90329-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Phenylethylene glycol has been identified in rat and human urine using gas chromatography/chemical ionization/mass spectrometry. A method was developed for the quantitative analysis in urine of this phenylalanine metabolite and of p-hydroxyphenylethanol, a metabolite of tyrosine, by converting them to the pentafluoropropionyl derivatives and measuring them by selected ion monitoring. In human urine, about 90% of the phenylethylene glycol was present in a conjugated form (releasable by glusulase), but the reverse was true for rat urine, with about 90% being present in the unconjugated form. The excretion of free phenylethylene glycol (expressed as ng/mg creatinine) was 2.7-fold higher in a group of untreated phenylketonuric patients than in the control group, but the phenylketonuric patients excreted abnormally low amounts of 3-methoxy-4-hydroxyphenylethylene glycol. Intraperitoneal injections of L-phenylalanine in rats resulted in a small increase in the excretion of phenylethylene glycol. On the other hand, the injection of phenylethanolamine resulted in an 82-fold increase in the excretion of phenylethylene glycol, but phenylethylamine had no effect. These results indicate that the conversion of phenylethylamine to phenylethanolamine is the rate limiting step in this metabolic pathway.
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115
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116
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Walash MI, Rizk M, Belal F, Abo-Ouf A. Evaluation of certain pharmaceuticals with dibromodimethylhydantoin. Part 2: Determination of analgesics. Pharmazie 1979; 34:234-6. [PMID: 482329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
1,3-Dibromodimethylhydantoin (DBH) is a stable dihalogen reagent. It can be used as an analytical reagent for certain analgesics. It gives stoichiometric results by direct titration in acid medium. The end point is detected visually or potentiometrically. Also spectrophotometric titrations have been attempted at 345 nm. In all cases the results of the analysis of the drugs studied either in the pure state or in their dosage forms comply with those given by N-bromo succinimide (NBS) and by the official methods, however this application is distinguished by simplicity and accuracy.
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117
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Zaki K, Rizk M, Kira L, Nour H, Guirguis R. Studies on the effects of ethinyl estradiol and norethisterone acetate on the adrenal cortex and some other tissues in the rat. Endokrinologie 1979; 73:66-76. [PMID: 467363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Alkaline phosphatase activity (AP) of the adrenal cortex of rats were determined under the effect of ethinyl estradiol (EE) and/or norethisterone acetate (NA), the two components of the contraceptive pill gyn-anovlar (Schering AG Berlin). A pathological study was also carried out to examine the effects of EE and NA on other tissues mainly the liver, lungs, spleen and ovaries. EE in a dose of 10 micrograms/day for 2 weeks caused a significant increase in the weight of the adrenal but no significant increase in the AP/g cortical tissue. The 25 and 50 micrograms doses for the same period caused a significant increase in both adrenal weight and AP. When treatment was prolonged to 6 weeks no effect on adrenal weight or AP was detected. The same finding was obtained with NA in a dose of 7 mg/rat/day for 2 weeks. The 14 mg dose of NA for the same period caused a significant increase in adrenal weight but no effect on AP. The 21 mg dose caused a significant increase in adrenal weight accompanied by significant decrease in AP/g cortical tissue. Treatment with NA for 6 weeks caused a rise in adrenal weight and AP with the 7 mg dose, then a decline in AP with the 14 mg dose, and a decline in both adrenal weight and AP with the 21 mg dose. As regards the effects of EE and NA on other tissues, EE was found to have a powerful stimulatory effect on the reticuloendothelial system (RES) as well as toxic effects on the liver. NA did not produce such lesions except for the large doses and prolonged periods of treatment. In addition NA produced cholestasis in the liver associated with staining of the liver cells with bile. Combination of EE and NA in the form of gyn-anovlar produced more powerful stimulation of RES and decreased the toxic manifestations of either component. As regards the ovaries, administration of 50 micrograms EE for 6 weeks produced profound hyperplasia of the granulosa cells of the Graafian follicles and inhibited ovulation, however, NA did not inhibit ovulation. With gyn-anovlar, the effect of EE on the ovaries seemed to predominate and ovulation was inhibited.
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118
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Rizk M, Walash MI. Gas-liquid chromatographic analysis of lynestrenol in contraceptive tablets. Pharmazie 1978; 33:521-2. [PMID: 724781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A simple procedure for the estimation of lynestrenol in contraceptive tablets is described. The method consists of extraction of the hormone into dichloromethane followed by g.l.c. of the resulting solution. 3 alpha-Etiocholanol-17-one is demonstrated as a suitable internal reference standard.
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119
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Abstract
HK has been measured in substructures of the developing rat nephron. Reactions were carried on samples dissected from freeze dried kidney and assayed in 1 mul reaction volume utilizing the "oil-well" technique. Samples from 4 days prenatal to 44-day adult were analyzed. Activity during development decreased in G, PCT, and it increased in ALH. There was little change in PRT, DCT and CT. Activity in small arteries decreased.
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120
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Rizk M, Vallon JJ, Badinand A. [Micromethods for the characterization and determination of acetylated steroids by the formation of silver acetates]. Anal Chim Acta 1974; 70:457-61. [PMID: 4849191 DOI: 10.1016/s0003-2670(01)85202-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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121
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122
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Sapira JD, Rodnan GP, Scheib ET, Klaniecki T, Rizk M. Studies of endogenous catecholamines in patients with Raynaud's phenomenon secondary to progressive systemic sclerosis (scleroderma). Am J Med 1972; 52:330-7. [PMID: 4551793 DOI: 10.1016/0002-9343(72)90020-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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123
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Sapira JD, Klaniecki T, Rizk M. Modified fluorometric method for determining plasma catecholamines. Clin Chem 1971; 17:486-91. [PMID: 5574770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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124
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125
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Schöllkopf U, Rizk M. Ortho-Rearrangement of Metalated Butynyl Benzyl Ether. Angew Chem Int Ed Engl 1965. [DOI: 10.1002/anie.196509571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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