351
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Khan R, Zhang XY, Supakar PC, Ehrlich KC, Ehrlich M. Human methylated DNA-binding protein. Determinants of a pBR322 recognition site. J Biol Chem 1988; 263:14374-83. [PMID: 3170549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Methylated DNA-binding protein (MDBP) from human placenta has a high affinity for a site in pBR322 (pB site 1) when that site is methylated at its CpG dinucleotides. Dimethyl sulfate interference analysis and experiments with ligands prepared by oligonucleotide-directed mutagenesis indicate that 15 contiguous base pairs, 14 of which exhibit hyphenated dyad symmetry, influence MDBP binding to pB site 1. These 14 base pairs, 5'-RTMGYCAMGG(M/T)GAY-3' (M, 5-methylcytosine), suffice for recognition by MDBP as demonstrated with a double-stranded, MpG-containing oligonucleotide used as a free ligand or cloned into M13mp19 and subsequently methylated. Seven single-site mutations at different positions of this 14-base pair region largely eliminated binding, and several others increased binding up to 2-fold when compared to the nonmutant, triply methylated sequence. However, MDBP recognizes a site in hemimethylated M13mp19 replicative form DNA, which was homology to pB site 1 at only 10 of 14 base pairs, and all four of these different base pairs are equivalent to transversions. Based upon the above data, a mixed oligonucleotide probe was constructed that contains variants of pB site 1 which should be recognized by MDBP. This 14-base probe hybridizes under stringent conditions to a number of discrete fragments in restriction digests of human DNA. this suggests that there are multiple pB site 1-related sequences in human DNA that might, when methylated, bind MDBP in vivo.
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Affiliation(s)
- R Khan
- Department of Biochemistry, Tulane Medical School, New Orleans, Louisiana 70112
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352
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Khan R, Zhang XY, Supakar PC, Ehrlich KC, Ehrlich M. Human methylated DNA-binding protein. Determinants of a pBR322 recognition site. J Biol Chem 1988. [DOI: 10.1016/s0021-9258(18)68230-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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353
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Supakar PC, Weist D, Zhang DL, Inamdar N, Zhang XY, Khan R, Ehrlich KC, Ehrlich M. Methylated DNA-binding protein is present in various mammalian cell types. Nucleic Acids Res 1988; 16:8029-44. [PMID: 2901711 PMCID: PMC338507 DOI: 10.1093/nar/16.16.8029] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
A DNA-binding protein from human placenta, methylated DNA-binding protein (MDBP), binds to certain DNA sequences only when they contain 5-methylcytosine (m5C) residues at specific positions. We found a very similar DNA-binding activity in nuclear extracts of rat tissues, calf thymus, human embryonal carcinoma cells, HeLa cells, and mouse LTK cells. Like human placental MDBP, the analogous DNA-binding proteins from the above mammalian cell lines formed a number of different low-electrophoretic-mobility complexes with a 14-bp MDBP-specific oligonucleotide duplex. All of these complexes exhibited the same DNA methylation specificity and DNA sequence specificity. From the extracts of rat and calf tissues, oligonucleotide protein complexes formed that also had the same specificity as human placental MDBP although they had a higher electrophoretic mobility probably due to digestion by proteases in the nuclear extracts. Although MDBP activity was found in various mammalian cell types, it was not detected in extracts of cultured mosquito cells and so may be associated only with cells with vertebrate-type DNA methylation.
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Affiliation(s)
- P C Supakar
- Department of Biochemistry, Tulane Medical School, New Orleans, LA 70112
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354
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Corlett R, Davies N, Khan R, Reichgelt H, van Harmelen F. Socrates: a flexible toolkit for building logic-based expert systems. Knowl Based Syst 1988. [DOI: 10.1016/0950-7051(88)90071-8] [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: 11/26/2022]
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355
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Kuhns HR, Morgan JA, Khan R, Goodpasture HC, Peterie JD. Neurocysticercosis. Kans Med 1987; 88:227-9. [PMID: 3626252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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356
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Singh YN, Hameed F, Khan R, Husain Z. Serum levels of 5'-nucleotidase, bilirubin, alkaline phosphatase and transaminase in liver diseases--a comparative study. INDIAN J PATHOL MICR 1987; 30:55-67. [PMID: 2824355] [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: 01/02/2023] Open
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357
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Wang RY, Zhang XY, Khan R, Zhou YW, Huang LH, Ehrlich M. Methylated DNA-binding protein from human placenta recognizes specific methylated sites on several prokaryotic DNAs. Nucleic Acids Res 1986; 14:9843-60. [PMID: 3027666 PMCID: PMC341339 DOI: 10.1093/nar/14.24.9843] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Methylated DNA-binding protein (MDBP) from human placenta recognizes specific DNA sequences containing 5-methylcytosine (m5C) residues. Comparisons of binding of various prokaryotic DNAs to MDBP indicate that m5CpG is present in the recognition sites for this protein but is only part of the recognition sequence. Specific binding to MDBP was observed for bacteriophage XP12 DNA, which naturally contains approximately 1/3 of its residues as m5C, and for Micrococcus luteus DNA, M13mp8 replicative form (RF) DNA, and pBR322 when these three DNAs were methylated at CpG sites by human DNA methyltransferase. Five DNA regions binding to MDBP have been localized by DNase I footprinting or restriction mapping in methylated pBR322 and M13mp8 RF DNAs. A comparison of their sequences reveals a common 5'-m5CGRm5CG-3' element or closely related sequence in which one of the m5C residues may be replaced by a T. In addition to this motif, one upstream and one downstream m5CpG as well as other common residues over an approximately 20-bp long region may be recognized by MDBP.
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358
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Kamal S, Lodhi T, Qureshi H, Zuberi S, Khan R. Tc-99m-Sn colloid dynamic and static scintigraphic evaluation of patients with portal hypertension. Kaku Igaku 1986; 23:389-95. [PMID: 3735784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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359
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Hoover EL, Hsu HK, Diaz C, Khan R, Reddy CV, Gross AM, Webb H, El-Sherif N, Griepp RB. Surgical management of synchronous coronary artery disease and multiple aortic stenosis: a case report with brief review of the literature. Tex Heart Inst J 1985; 12:187-93. [PMID: 15227030 PMCID: PMC341838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
One-stage surgery was successfully performed in a 44-year-old hypertensive man with uncontrolled angina, multiple coarctations of the thoracic and abdominal aorta, and a previous subtotal gastrectomy. There was a gradient of 120 mm Hg between the thoracic and abdominal aorta. A graft was placed retroperitoneally from the infrarenal aorta to the ascending aorta and was followed by a coronary artery bypass graft. Twenty-four months postoperatively, the patient was free of angina, and his hypertension was easily controlled.
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Affiliation(s)
- E L Hoover
- Division of Thoracic Surgery, The Brooklyn Veterans Administration Medical Center, and the State University of New York, Downstate Medical Center, Brooklyn, New York 11209, USA
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360
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Allen KR, Khan R, Watson D. Use of a diode array detector in investigation of neonatal organic aciduria. Clin Chem 1985; 31:561-3. [PMID: 3978788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We investigated the use of a diode array detector in conjunction with isocratic cation-exchange liquid chromatography for detection of organic acids in urine. The spectra and retention times of abnormal peaks found on chromatography of urine from patients with methylmalonic aciduria, maple syrup urine disease, and lactic aciduria were recorded and compared with those obtained for group of pure organic acids. Our results show that diode array detection helps considerably in tentatively identifying peaks appearing on an abnormal chromatogram while awaiting confirmation by mass spectrometry.
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361
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Abstract
Abstract
We investigated the use of a diode array detector in conjunction with isocratic cation-exchange liquid chromatography for detection of organic acids in urine. The spectra and retention times of abnormal peaks found on chromatography of urine from patients with methylmalonic aciduria, maple syrup urine disease, and lactic aciduria were recorded and compared with those obtained for group of pure organic acids. Our results show that diode array detection helps considerably in tentatively identifying peaks appearing on an abnormal chromatogram while awaiting confirmation by mass spectrometry.
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362
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Feit A, Reddy CV, Khan R, Meilman H, El-Sherif N. Changed learning curve for percutaneous transluminal coronary angioplasty. Implication for the future treatment of coronary artery disease. Am J Med 1985; 78:438-42. [PMID: 3156494 DOI: 10.1016/0002-9343(85)90335-3] [Citation(s) in RCA: 9] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
As with all skilled techniques, there is a learning curve for percutaneous coronary angioplasty. This curve has been well described in the literature and it is generally quoted that an initial success rate of 70 to 75 percent in reaching and crossing lesions is to be expected during the first 20 cases. However, the introduction of the steerable or guidewire-directed dilation catheter has altered the learning curve. After an initial experience of six nonsteerable percutaneous transluminal coronary angioplasty procedures, 20 consecutive steerable percutaneous transluminal coronary angioplasty procedures were performed without a single failure to reach or cross a lesion. These 20 consecutive steerable coronary angioplasty procedures included eight single left anterior descending lesions, two double (lesions located in series) left anterior descending lesions, six single right coronary lesions, one double (lesions located in series) right coronary lesion, and three single circumflex lesions. It is concluded that the introduction of the steerable system for percutaneous transluminal coronary angioplasty has shifted the learning curve, and that skilled and experienced coronary angiographers beginning a coronary angioplasty program can expect an initial success rate in reaching and crossing obstructive coronary lesions far in excess of the figures quoted in the literature. This may have significant implication for the ultimate availability of percutaneous transluminal coronary angioplasty to patients with coronary artery disease.
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363
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Behari R, Green JA, Maharaj R, Khan R. Renal oncocytoma. A report of 3 cases. S Afr Med J 1985; 67:182-3. [PMID: 3983759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Three cases of renal oncocytoma are presented; all were in women and involved the lower pole of the kidney. The patients presented with renal masses, but haematuria was not a feature. Unexplained monocytosis was found in 2 cases. Ultrasound investigations and intravenous pyelography gave non-specific results and the diagnoses were made on the basis of the histopathological findings.
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364
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Abstract
A case of arterial sheath kinking is reported. Radiographically, sheath kinking has some features which mimic sheath fracture. The radiographic appearance of sheath kinking is, however, distinctive and clearly separable from sheath fracture, the hallmark of which is extravasation of contrast at the fracture site.
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365
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Abstract
The location of obstructive coronary artery lesions in single-vessel disease is nonrandom. The circumflex coronary artery is protected relative to the right coronary artery. This may have important implications regarding the causation of coronary obstructive lesions.
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366
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Abstract
A 58-year-old man developed cardiac decompensation following aortic valve replacement as a result of an aortico-right ventricular fistula. Serial hemodynamic and electrocardiographic changes are presented. Attention is drawn to this rare complication as a cause of hemodynamic deterioration following aortic valve surgery.
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367
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Abstract
Complete fracture and separation of a right coronary Judkins catheter during coronary angiography is presented. The possible mechanism underlying the separation and retrieval of the catheter fragment is described.
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368
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Suciu-Foca N, Rohowsky C, Coburn C, Reed E, Khan R, Lewison A. Alloreactive T cells: expression of HLA-D antigens, stimulation of autologous MLR, and possible immunoregulatory function. Hum Immunol 1981; 3:301-12. [PMID: 6460016 DOI: 10.1016/0198-8859(81)90066-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Primed in MLC with allogeneic stimulators T cells acquire the capacity of expressing HLA-D and DR antigens and of stimulating the MLC response of autologous lymphocytes. When primed T cells from HTCs are used as stimulators, a bimodal distribution of responses with clear-cut "typing responses" and no significant "back stimulation" is observed. This pattern many be due to the expansion during priming of a population of HLD-D restricted suppressors since irradiated primed T cells inhibit the MLC responsiveness of HLA-A "compatible" lymphocytes. The development and size of such a population is not dependent, however, on the strength of the antigenic stimulus used for priming since no differences were seen between the pattern of reactions induced by T cells primed against HLA-D identical or HLA-D different cells. Primed OKT4+ and OKT8+ T cells share the capacity of expressing Ia antigens and of inducing "HLA-D restricted suppression." We suspected that a similar phenomenon accounted for the behavior of two HLA-D heterozygous cells as if they were HTCs. Although no suppression was found, the fact that these cells typed for their "silent" antigen when tested as responders, yet failed to express it when tested as stimulators, supports the theory that different genes control the MLC-responding and -stimulating capacities.
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369
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Suciu-Foca N, Reed E, Khan R, Coburn C, Lewison A, Hassanali R, Rohowsky C, Susinno E, Reemtsma K. HLA antigens in Asian Indians: HLA-D-DR relationships. Hum Immunol 1981; 3:261-70. [PMID: 6946986 DOI: 10.1016/0198-8859(81)90022-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Fifty-nine Asian Indians were typed for HLA-A, B, D, and DR antigens. Peculiar to the population that we have tested was the absence of HLA-A25, B13, B14, DR1, DW1, LD13 (a DR1-associated HLA-D allele), and LD12 (a DR4-associated HLA-D allele). Certain haplotypes that exhibit high frequencies in Caucasians (such as A2-BW50, AW24-B18, B8-DR3, BW44-DR7, B18-DR5) or in Blacks (such as A29-B7) also show significant delta in Asian Indians. The HLA-D-DR associations previously described in European and North American Caucasians were also found in Asian Indians. Additionally, however, Asian Indians exhibited two new HLA-D antigens, one associated with DR5 and the other with DRw6. The genetic distance between Asian Indians and Caucasians, Blacks, or Mongoloids is of the same order of magnitude.
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370
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Suciu-Foca N, Woodward K, Reed E, Khan R, Godfrey M, Hardy M, Reemtsma K. Posttransplant evaluation of T- and B-cell function. Transplant Proc 1981; 13:1584-8. [PMID: 6458129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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371
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Gomes JA, Kang PS, Khan R, Kelen G, El-Sherif N. Repetitive ventricular response. Its incidence, inducibility, reproducibility, mechanism, and significance. Heart 1981; 46:159-67. [PMID: 7272127 PMCID: PMC482622 DOI: 10.1136/hrt.46.2.159] [Citation(s) in RCA: 22] [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: 01/24/2023] Open
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372
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Abstract
The primed lymphocyte test (PLT) detects gene products of the HLA-D-DR region which activate the secondary (memory) response of MLC stimulated T cells. In the present study attempts were made to determine whether different HLA-D alleles associated with the same DR, such as DR1, 2, and 4 can be discriminated by PLT typing. PLTs were generated by using, as responders and primary MLC stimulators, HLA-D different HTCs which shared all DR groups (major DR, supertypic MT and second locus MB) or only the MT or MB groups. As secondary stimulators, lymphocytes from an HLA-D selected panel of 72 individuals were used. PLTs raised in DR identical responder-primary stimulator combinations were able to discriminate between the different HLA-D antigens associated with the same DR. In contrast, when priming was performed in combinations differing for the major DR group, the restimulation response was highly associated with the DR specificity of the primary stimulator, regardless of whether or not this was compatible with the responding HTC for the MT or MB groups. This data indicate that the specificity of primed lymphocytes largely depends on the combinations used for priming and that the memory response can be activated by both HLA-D and DR antigens. The dissociation of HLA-D from DR by PLT typing might provide a useful tool for further analysis of this HLA region.
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373
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Suciu-Foca N, Khan R, Hardy M, Godfrey M, Susinno E, Reed E, Woodward K, Reemtsma K. Expression of HLA-D and DR gene products on in vitro and in vivo primed human T cells. Transplant Proc 1981; 13:1020-5. [PMID: 6168060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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374
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Suciu-Foca N, Woodward K, Godfrey M, Khan R, Rohowsky C, Johnson W, Starkman S. Segregation of MLC suppressor T cell activity with the disease gene carrying haplotype in families with spinocerebellar ataxia. Hum Immunol 1980. [DOI: 10.1016/0198-8859(80)90087-7] [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: 10/21/2022]
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375
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Abstract
UNLABELLED Three patients with paroxysmal supraventricular tachycardia underwent electrophysiologic studies that included His bundle recordings, incremental atrial and ventricular pacing and extrastimulation before and after intravenous infusion of 500 mg of procainamide. In all three patients the tachycardia was induced during atrial pacing or premature atrial stimulation, or both. Two of the three patients had discontinuous atrioventricular (A-V) nodal curves with induction of a slow-fast tachycardia during failure in anterograde fast pathway conduction and one patient had a smooth A-V nodal curve with induction of a slow-fast tachycardia at critical A-H interval delays. After procainamide: (1) in all three patients atrial pacing induced A-V nodal Wenckebach periodicity (cycle length 300 to 400 ms) resulting in simultaneous anterograde fast and slow pathway conduction (one atrial beat resulting in two QRS complexes) and retrograde fast pathway conduction initiating an echo response or a slow-fast tachycardia, or both; (2) in all three patients there was enhanced conduction and shortening of refractoriness of the anteriograde fast pathway and depressed conduction and lengthening of refractoriness of the retrograde fast pathway; and (3) in two patients there was inability to sustain tachycardia because of selective block within the retrograde fast pathway. IN CONCLUSION (1) procainamide altered conduction and refractoriness of the anterograde fast and slow pathways so that simultaneous conduction could occur during atrial pacing, resulting in a double ventricular response and a slow-fast echo or tachycardia, or both; and (2) the differential effects of procainamide on anterograde fast and retrograde fast pathways suggests two functional A-V nodal fast pathways, oine for anterograde and the other for retrograde conduction.
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376
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377
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Kelen GJ, Bloomfield DA, Hardage M, Gomes JA, Khan R, Gopalaswamy C, El Sherif N. A clinical evaluation of an improved Holter monitoring technique for artificial pacemaker function. Pacing Clin Electrophysiol 1980; 3:192-7. [PMID: 6160508 DOI: 10.1111/j.1540-8159.1980.tb04328.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
This paper discusses shortcomings of conventional Holter monitoring in paced patients and describes a new technique which permits reliable detection of intermittent pacemaker malfunction and counts pacemaker activity during the recording period. Evaluation of the system of 64 consecutive patients revealed 15 with unsuspected episodic pacemaker dysfunction.
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378
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Khan R, Amaram S, Gomes JA, Kelen GJ, Lynfield J, El-Sherif N. Myocardial infarction following acute aortic dissection. Cathet Cardiovasc Diagn 1980; 6:181-4. [PMID: 7407905 DOI: 10.1002/ccd.1810060208] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Acute aortic dissection may present a clinical picture simulating myocardial infarction, including electrocardiographic changes. The mechanism underlying this mode of presentation has not heretofore been documented during life. We present here for the first time, a patient with acute aortic dissection and the clinical picture of acute myocardial infarction, where the mechanism of infarction has been demonstrated, by preoperative angiographic studies, probably to be due to compression of the extramural portion of the right coronary artery by the false channel of the dissecting hematoma.
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379
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380
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Toogood JH, Khan R, Lefcoe NM, Anderson J, Jennings B. [Diagnostic value of the lymphocyte transformation test in pigeon breeder's lung using fresh and cryo-preserved cells]. Bull Int Union Tuberc 1979; 54:200-2. [PMID: 526664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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381
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Jones R, Khan R, Hughes S, Dubowitz V. Congenital muscular dystrophy: the importance of early diagnosis and orthopaedic management in the long-term prognosis. J Bone Joint Surg Br 1979; 61:13-7. [PMID: 422630 DOI: 10.1302/0301-620x.61b1.422630] [Citation(s) in RCA: 13] [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: 12/15/2022]
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382
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Hughes S, Khan R, Davies R, Lavender P. The uptake by the canine tibia of the bone-scanning agent 99mTc-MDP before and after an osteotomy. J Bone Joint Surg Br 1978; 60-B:579-82. [PMID: 711811 DOI: 10.1302/0301-620x.60b4.711811] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The residue and extraction of technetium-labelled methylene diphosphonate (99mTc-MDP), a substance used in bone scanning, was examined in the canine tibia and found to be low. Examination of washout curves suggested that there were four compartments in cortical bone, a vascular, a perivascular, a bone fluid and a bone compartment. After an osteotomy in the canine tibia the residue of 99mTc-MDP increased. This was believed to be due to an increase in the blood supply to the bone and to an associated increase in new bone available for exchange. Bone scanning in a fracture is therefore a reflection of the vascular status of the bone being examined and of the uptake by bone. This is dependent on there being an adequate blood supply to the bone and an increased number of mineral-binding sites.
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383
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Hughes S, Davies R, Khan R, Kelly P. Fluid space in bone. Clin Orthop Relat Res 1978:332-41. [PMID: 729259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This paper reviews the extraction of solutes through capillaries in bone, by means of outflow dilution techniques in the canine tibia. Solutes leave capillaries in bone by passive diffusion dependent on molecular size. The fluid space in bone is also examined by means of analyzing washout curves of radioactive substances. It is proposed that there are 4 definable compartments in bone; a vascular space, a perivascular fluid space a bone fluid space and a bone space. The relevance of these spaces is in bone mineral short and long term ion exchange activity.
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384
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Roques R, Comeau L, Fourme R, Khan R, André D. Structure cristalline et moléculaire du diméthoxy-3βe,16βe oléanène-12(13) olide-28-21βa. ACTA ACUST UNITED AC 1977. [DOI: 10.1107/s0567740877006906] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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385
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Fotino M, Khan R, Suciu-Foca N, Rubinstein P. Recombination between the B and C loci of the HLA region. Transplant Proc 1977; 9:95-7. [PMID: 67685] [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: 12/12/2022]
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386
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387
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Abstract
Recent reports have indicated that bone marrow acid phosphatase is the most sensitive test in detecting bony metastases. The experience reported herein suggests that falsely positive results may be common, especially in patients with primary hematologic disorders. A plea is made that caution be given to the interpretation of this test so that some patients will not be denied appropriate therapy and the role of bone marrow acid phosphatase can be better defined by long-term followup in such patients.
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388
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Abstract
The effects of respiratory movements on the ultrasonic echoes of the cardiac structures were recorded and analyzed in 50 consecutive patients. Deep inspiration in cooperative patients resulted in a considerable increase of dense anterior echoes, with blotting out of any distal or posterior echoes in 12 of 44 patients (group A). In the second or larger series (32 of 44 patients; group B), a posterior displacement of most of the identifiable intrinsic cardiac echoes was seen with deep inspiration, particularly those of the posterior wall of the left ventricle. Forced expiration produced an opposite or anterior displacement of the cardiac echoes. Normal respirations showed similar but smaller excursions.
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389
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390
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391
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Aspinall GO, Khan R, King RR, Pawlak Z. Base-catalyzed Degradations of Carbohydrates. V. The Conversion of 3-Deoxyhex-2-enopyranoses into 2-Furoic Esters. CAN J CHEM 1973. [DOI: 10.1139/v73-202] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Condensation of 2,3,4-tri-O-acetyl-α-D-xylopyranosyl bromide and benzyl 2,3,4-tri-O-methyl β-D-glucopyranoside (2), followed by removal of protecting groups, affords 2,3,4-tri-O-methyl-6-O-(β-D-xylopyranosyl)-D-glucopyranose (5). Alkaline degradation of the disaccharide 5, followed by treatment with dilute acid, furnishes 5-β-D-xylopyranosyloxymethyl-2-furaldehyde (8), which is converted by oxidation and esterification, followed by acetylation, into methyl 5-(2,3,4-tri-O-acetyl-β-D-xylopyranosyl-oxymethyl-2-furoate (11), whose structure has been confirmed by direct synthesis.
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Rao GR, Khan R. Genetic breakdown of chromosome behaviour ofTribulus terrestris. Cell Mol Life Sci 1972. [DOI: 10.1007/bf01935769] [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: 11/29/2022]
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Aspinall GO, Khan R, Pawlak Z. Base-catalyzed Degradations of Carbohydrates. I. Synthesis and Alkaline Degradation of 2-O-β-D-Glucopyranosyl-3-O-methyl-D-glucose. CAN J CHEM 1971. [DOI: 10.1139/v71-500] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
2-O-β-D-Glucopyranosyl-3-O-methyl-D-glucose has been synthesized by two routes. Alkaline degradation of the disaccharide, followed by reduction, hydrolysis under extremely mild conditions, and further reduction, affords D-glucitol, and 3,4-dideoxy-trans-erythro- and -D-threo-hex-3-enitol.
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