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Elford J, Ibrahim F, Bukutu C, Anderson J. Over fifty and living with HIV in London. Sex Transm Infect 2009; 84:468-72. [PMID: 19028949 DOI: 10.1136/sti.2008.031187] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
OBJECTIVE To examine age at diagnosis, sexual behaviour and some social characteristics of people living with HIV in London who are over the age of 50 years, with particular reference to gay men. METHODS Patients with HIV infection attending National Health Service outpatient clinics in north-east London between June 2004 and June 2005 were asked to complete a confidential, self-administered questionnaire. RESULTS 1687 people with diagnosed HIV were recruited (63% response rate) including 758 gay men, 480 black African heterosexual women and 224 black African heterosexual men. Just over 10% of the whole sample (184/1687, 10.9%) were aged 50 years or above; gay men 13.1%, black African heterosexual men 8.5%, black African heterosexual women 6.9% (p<0.01). A third of the HIV-positive gay men over 50 years were diagnosed with HIV in their 50s or 60s (33.3%, 32/96). Overall, one in five HIV-positive gay men (20.1%, 144/715) reported high-risk sexual behaviour in the previous 3 months. This did not vary significantly by age (p = 0.2). CONCLUSION In this study of people living with HIV in London, one in seven gay men were over the age of 50 years. A third of the HIV-positive gay men over 50 years were diagnosed in their 50s or 60s, highlighting that this group is not just an ageing cohort of people who were diagnosed in their 30s or 40s. Positive prevention programmes should target HIV-positive gay men of all ages because older gay men with HIV were just as likely to report high-risk sexual behaviour as younger men.
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Choukem SP, Boudou P, Sobngwi E, Villette JM, Ibrahim F, Moulin P, Hadjadj S, Eberle D, Foufelle F, Vexiau P, Gautier JF. The polymorphism Arg585Gln in the gene of the sterol regulatory element binding protein-1 (SREBP-1) is not a determinant of ketosis prone type 2 diabetes (KPD) in Africans. DIABETES & METABOLISM 2009; 35:20-4. [DOI: 10.1016/j.diabet.2008.06.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2008] [Revised: 06/04/2008] [Accepted: 06/13/2008] [Indexed: 10/21/2022]
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Nakanjako D, Kiragga A, Ibrahim F, Castelnouvo B, Kamya M, Easterbrook P. Clinical Significance of Sub-Optimal CD4 Reconstitution Despite Viral Suppression in An Urban Cohort Initiating Antiretroviral Therapy in Sub-Saharan Africa. Int J Infect Dis 2008. [DOI: 10.1016/j.ijid.2008.05.504] [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] Open
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Ibrahim F, André C, Thomassin M, Guillaume YC. Association mechanism of four acetylcholinesterase inhibitors (AChEIs) with human serum albumin: a biochromatographic approach. J Pharm Biomed Anal 2008; 48:1345-50. [PMID: 18996666 DOI: 10.1016/j.jpba.2008.09.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2007] [Revised: 09/12/2008] [Accepted: 09/15/2008] [Indexed: 11/27/2022]
Abstract
In this work, the interaction of a series of acetylcholinesterase inhibitors (AChEIs; donepezil, galanthamine, huperzine and neostigmine) with human serum albumin (HSA) immobilized on porous silica particles was studied using a biochromatographic approach. For all the tested AChEI molecules, linear retention plots were observed at all temperatures. An analysis of the thermodynamics (i.e. enthalpy (DeltaH degrees ), entropy ((S degrees *)) of the interaction of the AChEI molecules with the immobilized human serum albumin was also carried out. The (H degrees and (S degrees * values for donepezil, galanthamine and neostigmine, were negative due to van der Waals interactions and hydrogen bonding which govern this association with albumin. Whereas the positive values of (H degrees and (S degrees * of huperzine binding on HSA indicated a predominance of hydrophobic interactions. The association of AChEIs with HSA was increased linearly with pH. A comparative thermodynamic study with benzodiazepine molecules was also done to determine the potential binding site of these drugs on HSA.
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Ibrahim F, Guillaume YC, André C. Chromatographic Framework to Determine the Memantine Binding Mechanism on Human Serum Albumin Surface. Chromatographia 2008. [DOI: 10.1365/s10337-008-0675-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Ibrahim F, Anderson J, Bukutu C, Elford J. Social and economic hardship among people living with HIV in London. HIV Med 2008; 9:616-24. [PMID: 18557949 DOI: 10.1111/j.1468-1293.2008.00605.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To examine the social and economic circumstances of people living with HIV in London. METHODS Between June 2004 and June 2005, 1687 people living with HIV (73% response) receiving treatment and care in north-east London National Health Service out-patient clinics completed a confidential, self-administered questionnaire. The questionnaire sought information on employment, income, education, residency status in the UK and housing. RESULTS In total, 1604 respondents were included in the analysis: Black African heterosexual women (n=480) and men (224); White (646) and ethnic minority (i.e. non-White) homosexual men (112); White heterosexual men (64) and women (39); and Black Caribbean heterosexual women (26) and men (13). Black African heterosexual men and women consistently reported more difficulties than any other group in relation to employment, income, housing and residency status. Half the Black African heterosexual men (46.8%) and women (51.2%) reported insecure residency status in the UK, significantly more than any other group (P<0.001). Just under half the respondents (46.6%) were employed at the time of the survey; Black African heterosexual women (35.3%) and men (45.4%) were less likely to be employed than White (57.6%) or ethnic minority (53.7%) homosexual men (P<0.001). Forty per cent of Black African heterosexual men and women, 22.9% of ethnic minority homosexual men and 9.6% of White homosexual men did not have enough money to cover their basic needs (P<0.001). CONCLUSIONS In this study of people living with HIV in London, a substantial number faced social and economic hardship, particularly Black African and other ethnic minority respondents. Our findings provide further evidence that in London HIV is associated with poverty, particularly among migrant and ethnic minority populations.
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Elford J, Ibrahim F, Bukutu C, Anderson J. Uptake of antiretroviral treatment among people living with HIV in London: ethnicity, gender and sexual orientation. Sex Transm Infect 2008; 84:176-8. [PMID: 18283091 DOI: 10.1136/sti.2007.029249] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVE To examine, by ethnicity, gender and sexual orientation, uptake of antiretroviral treatment among people living with HIV in London. METHODS Between June 2004 and June 2005, 1687 people living with HIV (73% response) receiving treatment and care in North East London National Health Service outpatient clinics completed a confidential, self administered, questionnaire. Respondents were asked whether they were currently taking HIV treatments (antiretroviral or combination therapy) RESULTS Overall, 73.7% (1057/1435) of respondents said they were currently taking HIV treatments: white men who have sex with men (MSM) 70.7%; ethnic minority MSM 70.9%; black African heterosexual women 75.0%; black African heterosexual men 80.8% (p<0.05). In all groups, taking HIV treatments was strongly associated with having a low CD4 cell count at diagnosis (p<0.001); 30.1% of white and ethnic minority MSM had a CD4 cell count less than 200 cells/mm(3) at diagnosis compared with 53.1% of the black African heterosexual women and 66.3% of the black African heterosexual men (p<0.001). After adjusting for CD4 cell count at diagnosis, no significant differences in uptake of HIV treatments remained between the groups: MSM AOR 1.00 (reference group); black African heterosexual women AOR 1.15, 95% CI 0.71 to 1.88, p = 0.6; black African heterosexual men AOR 0.88, 95% CI 0.43 to 1.80, p = 0.7. CONCLUSION Our analysis suggests that in London, once HIV infection is diagnosed, people from the two main risk groups-MSM (mostly white men) and black African heterosexual men and women-receive HIV treatment according to clinical need regardless of their ethnicity, gender or sexual orientation.
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Bailey AC, Samarawickrama A, Ibrahim F, Barker RD, Post FA. Characteristics distinguishing disseminated Mycobacterium tuberculosis (MTB) and non-tuberculous mycobacterial (NTM) infection in HIV patients. J Int AIDS Soc 2008. [DOI: 10.1186/1758-2652-11-s1-p262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Van de Walle J, Aksouh F, Ames F, Behrens T, Bildstein V, Blazhev A, Cederkäll J, Clément E, Cocolios TE, Davinson T, Delahaye P, Eberth J, Ekström A, Fedorov DV, Fedosseev VN, Fraile LM, Franchoo S, Gernhauser R, Georgiev G, Habs D, Heyde K, Huber G, Huyse M, Ibrahim F, Ivanov O, Iwanicki J, Jolie J, Kester O, Köster U, Kröll T, Krücken R, Lauer M, Lisetskiy AF, Lutter R, Marsh BA, Mayet P, Niedermaier O, Nilsson T, Pantea M, Perru O, Raabe R, Reiter P, Sawicka M, Scheit H, Schrieder G, Schwalm D, Seliverstov MD, Sieber T, Sletten G, Smirnova N, Stanoiu M, Stefanescu I, Thomas JC, Valiente-Dobón JJ, Van Duppen P, Verney D, Voulot D, Warr N, Weisshaar D, Wenander F, Wolf BH, Zielińska M. Coulomb excitation of neutron-rich Zn isotopes: first observation of the 2(1)+ state in 80Zn. PHYSICAL REVIEW LETTERS 2007; 99:142501. [PMID: 17930664 DOI: 10.1103/physrevlett.99.142501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2007] [Indexed: 05/25/2023]
Abstract
Neutron-rich, radioactive Zn isotopes were investigated at the Radioactive Ion Beam facility REX-ISOLDE (CERN) using low-energy Coulomb excitation. The energy of the 2(1)+ state in 78Zn could be firmly established and for the first time the 2+ --> 0(1)+ transition in 80Zn was observed at 1492(1) keV. B(E2,2(1)+ --> 0(1)+) values were extracted for (74,76,78,80)Zn and compared to large scale shell model calculations. With only two protons outside the Z=28 proton core, 80Zn is the lightest N=50 isotone for which spectroscopic information has been obtained to date. Two sets of advanced shell model calculations reproduce the observed B(E2) systematics. The results for N=50 isotones indicate a good N=50 shell closure and a strong Z=28 proton core polarization. The new results serve as benchmarks to establish theoretical models, predicting the nuclear properties of the doubly magic nucleus 78Ni.
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de Thé G, Bomford R, Kazanji M, Ibrahim F. Human T cell lymphotropic virus: necessity for and feasibility of a vaccine. CIBA FOUNDATION SYMPOSIUM 2007; 187:47-55; discussion 55-60. [PMID: 7796676 DOI: 10.1002/9780470514672.ch4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Human T cell lymphotropic virus types I and II (HTLV-I/II) are endemic in certain areas of the world. They cause two life-threatening diseases, adult T cell leukaemia/lymphoma and tropical spastic paraparesis. A vaccine is needed because in developing countries there are no other feasible preventive interventions against these diseases and in Western countries intravenous drug users at high risk for HTLV-I and HTLV-II infections and the health workers in contact with such populations must be protected. We have developed a rat model in which we observed variations of susceptibility to viral infection between inbred strains, the most susceptible being the Fischer F344, and the possibility of viral latency in the nervous system. We have prepared a recombinant adenovirus vector that expresses the HTLV-I envelope glycoprotein env in HeLa cells. A target human population in French Guyana, in which the prevalence rate reaches 5.6% in one ethnic group (Bonis), has been identified for possible intervention.
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Low N, McCarthy A, Macleod J, Salisbury C, Campbell R, Roberts TE, Horner P, Skidmore S, Sterne JAC, Sanford E, Ibrahim F, Holloway A, Patel R, Barton PM, Robinson SM, Mills N, Graham A, Herring A, Caul EO, Davey Smith G, Hobbs FDR, Ross JDC, Egger M. Epidemiological, social, diagnostic and economic evaluation of population screening for genital chlamydial infection. Health Technol Assess 2007; 11:iii-iv, ix-xii, 1-165. [PMID: 17311735 DOI: 10.3310/hta11080] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES To investigate epidemiological, social, diagnostic and economic aspects of chlamydia screening in non-genitourinary medicine settings. METHODS Linked studies around a cross-sectional population-based survey of adult men and women invited to collect urine and (for women) vulvovaginal swab specimens at home and mail these to a laboratory for testing for Chlamydia trachomatis. Specimens were used in laboratory evaluations of an amplified enzyme immunoassay (PCE EIA) and two nucleic acid amplification tests [Cobas polymerase chain reaction (PCR), Becton Dickinson strand displacement amplification (SDA)]. Chlamydia-positive cases and two negative controls completed a risk factor questionnaire. Chlamydia-positive cases were invited into a randomised controlled trial of partner notification strategies. Samples of individuals testing negative completed psychological questionnaires before and after screening. In-depth interviews were conducted at all stages of screening. Chlamydia transmission and cost-effectiveness of screening were investigated in a transmission dynamic model. SETTING AND PARTICIPANTS General population in the Bristol and Birmingham areas of England. In total, 19,773 women and men aged 16-39 years were randomly selected from 27 general practice lists. RESULTS Screening invitations reached 73% (14,382/19,773). Uptake (4731 participants), weighted for sampling, was 39.5% (95% CI 37.7, 40.8%) in women and 29.5% (95% CI 28.0, 31.0%) in men aged 16-39 years. Chlamydia prevalence (219 positive results) in 16-24 year olds was 6.2% (95% CI 4.9, 7.8%) in women and 5.3% (95% CI 4.4, 6.3%) in men. The case-control study did not identify any additional factors that would help target screening. Screening did not adversely affect anxiety, depression or self-esteem. Participants welcomed the convenience and privacy of home-sampling. The relative sensitivity of PCR on male urine specimens was 100% (95% CI 89.1, 100%). The combined relative sensitivities of PCR and SDA using female urine and vulvovaginal swabs were 91.8% (86.1, 95.7, 134/146) and 97.3% (93.1, 99.2%, 142/146). A total of 140 people (74% of eligible) participated in the randomised trial. Compared with referral to a genitourinary medicine clinic, partner notification by practice nurses resulted in 12.4% (95% CI -3.7, 28.6%) more patients with at least one partner treated and 22.0% (95% CI 6.1, 37.8%) more patients with all partners treated. The health service and patients costs (2005 prices) of home-based postal chlamydia screening were 21.47 pounds (95% CI 19.91 pounds, 25.99) per screening invitation and 28.56 pounds (95% CI 22.10 pounds, 30.43) per accepted offer. Preliminary modelling found an incremental cost-effectiveness ratio (2003 prices) comparing screening men and women annually to no screening in the base case of 27,000 pounds/major outcome averted at 8 years. If estimated screening uptake and pelvic inflammatory disease incidence were increased, the cost-effectiveness ratio fell to 3700 pounds/major outcome averted. CONCLUSIONS Proactive screening for chlamydia in women and men using home-collected specimens was feasible and acceptable. Chlamydia prevalence rates in men and women in the general population are similar. Nucleic acid amplification tests can be used on first-catch urine specimens and vulvovaginal swabs. The administrative costs of proactive screening were similar to those for opportunistic screening. Using empirical estimates of screening uptake and incidence of complications, screening was not cost-effective.
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Ibrahim F, Ooi KF, Ismail NA, Taib MN, Wan Abas WAB. Analysis of water compartment in dengue patients. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2007; 2005:4130-3. [PMID: 17281142 DOI: 10.1109/iembs.2005.1615372] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
This paper describes the water compartments in healthy subjects and dengue patients on the day of defervescence of fever using bioelectrical impedance analysis. A total of 223 healthy subjects (65 males and 158 females) and 210 dengue patients (119 males and 91 females) in Hospital Universiti Kebangsaan Malaysia (HUKM), were studied. The ages for healthy subjects vary between 14 and 60 years old with mean age of 26.05 years while the ages for the dengue patients vary between 12 and 83 years old with mean age of 30.14 years. The parameters of water compartments investigated were total body water (TBW), extracellular water (ECW) and intracellular water (ICW). There were significant difference between healthy subjects and dengue patients for both male (p<0.05) and female (p<0.001) beginning on fever day 0 till fever day 4. The mean TBW and ECW values of dengue patients obtained were found to be higher than the normal healthy subjects while the mean ICW was lower. The mean TBW and ICW for male were higher than female while the mean ECW for male was lower than female for healthy subjects and dengue patients.
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Ahmed S, Rizk M, Belal F, Ibrahim F, Sheribah ZA. Stability‐Indicating HPLC Method for Captopril Through Pre‐Column Derivatization with Pd(II). J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070500478999] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Cho J, Choi J, Nam T, Park J, Park-Ko I, Ibrahim F. Development of tilt table with visual feedback function for hemiplegia patients. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2007; 2007:4782-4785. [PMID: 18003075 DOI: 10.1109/iembs.2007.4353409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Due to damaged vertebrae nerves, serious disease and aging, patients who have to lie down for long period of time need to exercise to maintain up-right standing position and recover their muscle power of paralytic leg. This study describes the development of an intelligent tilt table which can provide a patient with visual feedback of exercise to increase the effect of rehabilitation. This could be possible by measuring and displaying the knee bent angle and pressure for each foot during exercise in real time. It is expected that patient's exercising effect can increase by self-monitoring these two values during exercise.
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Zakhari NA, Rizk M, Walash MI, Ibrahim F. Fluorimetric Determination of Certain Phenothiazine Derivatives Using Eosin. ANAL LETT 2006. [DOI: 10.1080/00032718508066220] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Low N, Egger M, Sterne JAC, Harbord RM, Ibrahim F, Lindblom B, Herrmann B. Incidence of severe reproductive tract complications associated with diagnosed genital chlamydial infection: the Uppsala Women's Cohort Study. Sex Transm Infect 2006; 82:212-8. [PMID: 16731670 PMCID: PMC2576723 DOI: 10.1136/sti.2005.017186] [Citation(s) in RCA: 105] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
OBJECTIVE To estimate the cumulative incidence of severe complications associated with genital chlamydia infection in the general female population. METHODS The Uppsala Women's Cohort Study was a retrospective population based cohort study in Sweden, linking laboratory, hospital, and population registers. We estimated the cumulative incidence of hospital diagnosed pelvic inflammatory disease, ectopic pregnancy, and infertility, and used multivariable regression models to estimate hazard ratios according to screening status. RESULTS We analysed complete data from 43 715 women in Uppsala aged 15-24 years between January 1985 and December 1989. Follow up until the end of 1999 included 709 000 woman years and 3025 events. The cumulative incidence of pelvic inflammatory disease by age 35 years was 3.9% (95% CI 3.7% to 4.0%) overall: 5.6% (4.7% to 6.7%) in women who ever tested positive for chlamydia, 4.0% (3.7% to 4.4%) in those with negative tests, and 2.9% (2.7% to 3.2%) in those who were never screened. The corresponding figures were: for ectopic pregnancy, 2.3% (2.2% to 2.5%) overall, 2.7% (2.1% to 3.5%), 2.0% (1.8% to 2.3%), and 1.9% (1.7% to 2.1%); and for infertility, 4.1% (3.9% to 4.3%) overall, 6.7% (5.7% to 7.9%), 4.7% (4.4% to 5.1%), and 3.1% (2.8% to 3.3%). Low educational attainment was strongly associated with the development of all outcomes. CONCLUSIONS The incidence of severe chlamydia associated complications estimated from ours, and other population based studies, was lower than expected. Studies that incorporate data about pelvic inflammatory disease diagnosed in primary care and behavioural risk factors would further improve our understanding of the natural history of chlamydia. Our results provide reassurance for patients, but mean that the benefits of chlamydia screening programmes might have been overestimated.
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Gaudefroy L, Sorlin O, Beaumel D, Blumenfeld Y, Dombrádi Z, Fortier S, Franchoo S, Gélin M, Gibelin J, Grévy S, Hammache F, Ibrahim F, Kemper KW, Kratz KL, Lukyanov SM, Monrozeau C, Nalpas L, Nowacki F, Ostrowski AN, Otsuka T, Penionzhkevich YE, Piekarewicz J, Pollacco EC, Roussel-Chomaz P, Rich E, Scarpaci JA, St Laurent MG, Sohler D, Stanoiu M, Suzuki T, Tryggestad E, Verney D. Reduction of the spin-orbit splittings at the n = 28 shell closure. PHYSICAL REVIEW LETTERS 2006; 97:092501. [PMID: 17026356 DOI: 10.1103/physrevlett.97.092501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2006] [Indexed: 05/12/2023]
Abstract
The N = 28 shell closure has been investigated via the 46Ar(d,p)47Ar transfer reaction in inverse kinematics. Energies and spectroscopic factors of the neutron p(3/2), p(1/2), and f(5/2) states in 47Ar were determined and compared to those of the 49Ca isotone. We deduced a reduction of the N = 28 gap by 330(90) keV and spin-orbit weakenings of approximately 10(2) and 45(10)% for the f and p states, respectively. Such large variations for the f and p spin-orbit splittings could be accounted for by the proton-neutron tensor force and by the density dependence of the spin-orbit interaction, respectively. This contrasts with the picture of the spin-orbit interaction as a surface term only.
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Ingen-Housz-Oro S, Boudou P, Bergot C, Ibrahim F, Souberbielle JC, Dubertret L, Blanchet-Bardon C. Evidence of a marked 25-hydroxyvitamin D deficiency in patients with congenital ichthyosis. J Eur Acad Dermatol Venereol 2006; 20:947-52. [PMID: 16922943 DOI: 10.1111/j.1468-3083.2006.01689.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Vitamin D is essential for bone mineralization, and its deficiency may be the cause of skeletal fractures and osteomalacia. Geographical or ethnic factors may modulate the cutaneous synthesis of vitamin D. We hypothesized that major changes in keratinization may similarly alter the cutaneous synthesis of vitamin D. OBJECTIVES To explore calciotrophic hormones, parameters of bone remodelling and bone mineral density (BMD) in nine patients with non-bullous congenital ichthyosis. PATIENTS AND METHODS Six patients were European, three were North African. Four had received acitretin over a long period of time. A complete biological investigation, including serum and urinary calcium and phosphorus, calciotrophic hormones [intact parathyroid hormone (iPTH), 25-hydroxyvitamin D (25-(OH)D) and 1,25-dihydroxyvitamin D (1,25-(OH)2D)], bone formation and resorption markers, was performed on all patients during the winter season and repeated among four patients after summer. BMD was measured in all patients. RESULTS All patients had a marked 25-(OH)D deficiency, clearly below the deficiency threshold of 25 nmol/L. Patients from North Africa had a greater deficiency than European patients, perhaps because of the difference in skin pigmentation. iPTH remained normal in European patients but was elevated among the North Africans. After sun exposure, an improvement in vitamin status was visible in only one patient. Bone formation and resorption markers remained normal. Femoral neck osteodensitometry indicated values near the osteopaenic threshold in two young North African females. No deleterious effect of retinoids on vitamin D metabolism was observed. CONCLUSION Patients, and in particular pigmented patients, with congenital ichthyosis present a severe deficiency in vitamin D. Care provided to protect the skeletal future of these patients involves measuring BMD and prescribing supplementation.
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Perru O, Sorlin O, Franchoo S, Azaiez F, Bouchez E, Bourgeois C, Chatillon A, Daugas JM, Dlouhy Z, Dombrádi Z, Donzaud C, Gaudefroy L, Grawe H, Grévy S, Guillemaud-Mueller D, Hammache F, Ibrahim F, Le Coz Y, Lukyanov SM, Matea I, Mrazek J, Nowacki F, Penionzhkevich YE, de Oliveira Santos F, Pougheon F, Saint-Laurent MG, Sletten G, Stanoiu M, Stodel C, Theisen C, Verney D. Enhanced core polarization in (70)Ni and (74)Zn. PHYSICAL REVIEW LETTERS 2006; 96:232501. [PMID: 16803374 DOI: 10.1103/physrevlett.96.232501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2005] [Revised: 04/26/2006] [Indexed: 05/10/2023]
Abstract
The reduced transition probabilities B(E2;0(+) --> 2(+)(1)) of the neutron-rich (74)Zn and (70)Ni nuclei have been measured by Coulomb excitation in a (208)Pb target at intermediate energy. These nuclei have been produced at Grand Accélérateur National d'Ions Lourds via interactions of a 60A MeV (76)Ge beam with a Be target. The B(E2) value for (70)Ni(42) is unexpectedly large, which indicates that neutrons added above N=40 strongly polarize the Z=28 proton core. In the Zn isotopic chain, the steep rise of B(E2) values beyond N=40 continues up to (74)Zn(44). The enhanced proton core polarization in (70)Ni is attributed to the monopole interaction between the neutron in the g(9/2) and protons in the f(7/2) and f(5/2) spin-orbit partner orbitals. This interaction could result in a weakening of magicity in (78)Ni(50).
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Boudou P, Ibrahim F, Cormier C, Sarfati E, Souberbielle JC. A very high incidence of low 25 hydroxy-vitamin D serum concentration in a French population of patients with primary hyperparathyroidism. J Endocrinol Invest 2006; 29:511-5. [PMID: 16840828 DOI: 10.1007/bf03344140] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Since the demonstration that vitamin D status might influence the clinical and biological expression of primary hyperparathyroidism (PHPT), a serum 25-hydroxy vitamin D (25-OHD) concentration of 50 nmol/l has been considered by an expert panel as the minimum level to be maintained in asymptomatic PHPT patients. Two yr after this recommendation, we aimed to evaluate the frequency of serum 25-OHD concentrations below this threshold in PHPT patients. In the present study, serum 25-OHD, second- and third-generation PTH, calcium, phosphate, magnesium, albumin and creatinine were measured in 72 out 145 consecutive PHPT patients operated on in our Endocrine Surgery Department, in whom blood samples were available before as well as two days after surgical intervention. Before surgery, the frequency of serum 25-OHD levels <50 nmol/l ranged from 91.5 to 100% whatever the classification used to identify patients: whole group, symptomatic vs asymptomatic, patients with calcium levels >3 vs <3 mmol/l. 25-OHD concentrations correlated negatively with the weight of adenoma, PTH levels, and total calcium concentrations measured before surgery. Pre-operative PTH levels, whatever the assay used, and total calcium concentrations were positively and significantly correlated. Two days post-surgery, 13 patients were moderately hypocalcemic. Neither pre-surgery 25-OHD nor PTH, calcium or phosphorus level or adenoma weight were predictive of post-operative hypocalcemia. The dramatic frequency of low 25-OHD concentrations in our PHPT patients demonstrates that the above-mentioned recommendation is far from being applied in France despite evidence of worsening expression of PHPT with decreasing 25-OHD serum levels.
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Boudou P, Sobngwi E, Ibrahim F, Porcher R, Vexiau P, Calvo F, Gautier JF. Hyperglycaemia acutely decreases circulating dehydroepiandrosterone levels in healthy men. Clin Endocrinol (Oxf) 2006; 64:46-52. [PMID: 16402927 DOI: 10.1111/j.1365-2265.2005.02414.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVE This study was conducted in order to evaluate the effect of glucose-insulin homeostasis on adrenal steroids and was designed to separate the effects of hyperglycaemia from those of insulin. DESIGN Eight healthy men aged 22.6 +/- 3.4 (SD) underwent an 80 mU/m2/min hyperinsulinaemic euglycaemic 100-min clamp, a 200-min graded glucose infusion at 2-16 mg/kg/min and a measurement of fat mass. MEASUREMENTS Circulating glucose, insulin and adrenal steroid levels including dehydroepiandrosterone (DHEA) were determined before and during both infusion tests. Steroid variations in relation to insulinaemia and glycaemia were analysed using univariate, multivariate tests and nonlinear mixed models. RESULTS Hyperinsulinaemia induced no significant modification of adrenal steroid levels. By contrast, hyperglycaemia decreased all adrenal steroids except DHEA-sulphate by 47-66%. The drop occurred early, averaging 51% for 17OH pregnenolone and 57% for DHEA at the 80th minute of glucose infusion, whereas blood glucose was 7.1 +/- 1.2 mmol/1. This effect was independent of insulinaemia, fat mass and waist circumference. Thus, we estimated models that could best predict steroid variations according to blood glucose. At thresholds defining impaired fasting glycaemia and diabetes, the estimated decrease in DHEA was 40% and 45%, respectively, culminating at 60% at 9.3 mmol/1 glycaemia, with no detectable further decrease. CONCLUSIONS Our data suggest that hyperglycaemia dramatically decreases adrenal androgen levels in men, possibly by acting at early steps of synthesis, independently of insulinaemia and fat mass.
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97
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Ibrahim F, Ismail NA, Taib MN, Wan Abas WAB. Modeling of hemoglobin in dengue fever and dengue hemorrhagic fever using bioelectrical impedance. Physiol Meas 2005; 25:607-15. [PMID: 15253113 DOI: 10.1088/0967-3334/25/3/002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This paper describes a model for predicting hemoglobin (Hb) by using bioelectrical impedance analysis (BIA) in dengue patients in the Hospital Universiti Kebangsaan Malaysia (HUKM). Bioelectrical impedance measurements were conducted on 83 (47 males and 36 females) serologically confirmed dengue fever (DF) and dengue hemorrhagic fever (DHF) patients during their hospitalization. The predictive equation for Hb was derived using multivariate analysis. We investigated all the parameters in BIA, patients' symptom and demographic data. In this developed model, four predictors (reactance (XC), sex, weight and vomiting) were found to be the best predictive factors for modeling Hb in dengue patients. However, the model can only explain approximately 42% of the variation in Hb status, thus single frequency bio-impedance stand-alone technique is insufficient to monitor Hb for the DF and DHF patients. Further investigation using multi-frequency BIA is recommended in modeling Hb to achieve the most parsimonious model.
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98
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Ibrahim F, El-Enany N. Polarographic determination of ciclopirox olamine in pure substance and in different pharmaceutical preparations. ACTA ACUST UNITED AC 2003; 58:1313-8. [PMID: 14630245 DOI: 10.1016/j.farmac.2003.07.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Two simple and sensitive methods are described for the determination of ciclopirox olamine in its pure form and different dosage forms. The proposed method depends upon the polarographic activity of ciclopirox olamine at the dropping mercury electrode (DME) in Britton Robinson buffer, whereby, well-defined cathodic waves were produced over the pH range 7-9. The polarographic wave was characterized as being irreversible diffusion-controlled with limited adsorption properties. The current-concentration relationship was found to be rectilinear over the range 8-32 and 2-12 microg ml(-1) using direct current (dct) and differential pulse polarographic (DPP) modes respectively, with minimum detectability of 0.53 microg ml(-1) (2.65 x 10(-6) M) and 0.1 microg ml(-1) (5 x 10(-7) M) using the dct and DPP modes, respectively. The average percent recovery was favorably compared to spectrophotometric method. The proposed method was further applied to dosage forms including ciclopirox lotion and cream. The average percentage recoveries for lotion were 100.34+/-0.84 and 99.96+/-1.06 using dct and DPP modes, respectively, and for cream were 100.53+/-0.59 and 100.02+/-0.89 using dct and DPP modes, respectively.
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Ibrahim F, el-Enany N. Anodic polarographic determination of ciclopirox olamine in pure and certain pharmaceutical preparations. J Pharm Biomed Anal 2003; 32:353-9. [PMID: 12763546 DOI: 10.1016/s0731-7085(02)00709-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The anodic polarographic behavior of ciclopirox have been studied in Britton Robinson buffer (BRb) over the pH range 6-11. In BRb of pH 7 a well defined anodic wave was produced with diffusion current constant (Id) of 4.86+/-0.048 (n=6) using DC(t) mode. Adopting both of direct current (DC(t)) and differential pulse polarographic (DPP) modes, the current-concentration relationship was found to be rectilinear over the range 4 to 24 and 2 to 12 microg ml(-1) respectively, with minimum detectability (S/N=2) of 0.2 microg ml(-1) (1 x 10(-6) M) using the DPP mode. The average percent recovery was favourably compared to a reference method, with a satisfactory standard deviation, the proposed method was further applied to the determination of ciclopirox olamine in certain pharmaceutical preparations including lotion and cream. The average percentage recoveries for lotion were 100.06+/-0.94 and 100.06+/-1.08 using DC(t) and DPP modes respectively, and for cream were 100.17+/-0.64 and 100.34+/-1.28 using DC(t) and DPP modes, respectively. A pathway for the electrode reaction was postulated.
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100
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Walash MI, Belal F, Ibrahim F, Hefnawy M, Eid M. Voltammetric determination of nitrosocimetidine in simulated gastric juice. J Clin Pharm Ther 2002; 27:365-70. [PMID: 12383138 DOI: 10.1046/j.1365-2710.2002.00432.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To develop a voltammetric method for the determination of nitrosocimetidine in simulated gastric juice (SGJ). METHOD Measurement of the polarographic wave of the nitroso derivative at the dropping mercury electrode in 0.1 m HCl. RESULTS A well-defined diffusion-controlled cathodic wave was obtained at -0.34 V vs. Ag/AgCl electrode. The current-concentration relationship was found to be rectilinear over the range 10-80 microg/mL and 2-50 microg/mL with percentage recovery of 101.24 +/- 0.79 and 100.79 +/- 0.56 for the direct current (DCt) and differential pulse polarography (DPP) modes, respectively, with a minimum detectability (S/N=2) of 0.16 microg/ml (5.6 x 10-7 m) using DPP mode. CONCLUSION The proposed method was successfully applied to study the nitrosation of cimetidine in SGJ.
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