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Hafez M, Helmy N. 346. Epidural Ropivacaine Versus Bupivacaine for Cesarean Section: Effect on Maternal and Fetal Hemodynamica. Reg Anesth Pain Med 2008. [DOI: 10.1136/rapm-00115550-200809001-00025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Hafez M, Helmy N. 450. Nmda Antagonist: Ketamine for “balanced Analgesia” in the Perioperative Period What Is the Preferential Route? Reg Anesth Pain Med 2008. [DOI: 10.1136/rapm-00115550-200809001-00461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Dimitrov V, Heng J, Timp K, Dimauro O, Chan R, Hafez M, Feng J, Sorsch T, Mansfield W, Miner J, Kornblit A, Klemens F, Bower J, Cirelli R, Ferry EJ, Taylor A, Feng M, Timp G. Small-Signal Performance and Modeling of sub-50nm nMOSFETs with f above 460-GHz. SOLID-STATE ELECTRONICS 2008; 52:899-908. [PMID: 20706596 PMCID: PMC2919744 DOI: 10.1016/j.sse.2008.01.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have fabricated and tested the performance of sub-50nm gate nMOSFETs to assess their suitability for mixed signal applications in the super high frequency (SHF) band, i.e. 3-30GHz. For a 30nm×40 μm×2 device, we found f(T) =465GHz at V(ds)=2V, V(g)=0.67V, which is the highest cut-off frequency reported for a MOSFET produced on bulk silicon substrate so far. However, our measurements of f(max) and noise figure indicate that parasitics impose limitations on SHF operation. We also present a high-frequency ac model appropriate to sub-50nm gate length nanotransistors, which incorporates the effects of the parasitics. The model accurately accounts for measurements of the S and Y parameters in the frequency range from 1 to 50GHz.
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Velázquez R, Pissaloux EE, Hafez M, Szewczyk J. Toward low-cost highly portable tactile displays with shape memory alloys. Appl Bionics Biomech 2007. [DOI: 10.1080/11762320701470517] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Mahmoud WE, Mansour S, Hafez M, Salam M. On the degradation and stability of high abrasion furnace black (HAF)/acrylonitrile butadiene rubber (NBR) and high abrasion furnace black (HAF)/graphite/acrylonitrile butadiene rubber (NBR) under cyclic stress–strain. Polym Degrad Stab 2007. [DOI: 10.1016/j.polymdegradstab.2007.08.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Maingreaud F, Pissaloux EE, Velazquez R, Gaunet F, Hafez M, Alexandre JM. A dynamic tactile map as a tool for space organization perception: application to the design of an electronic travel aid for visually impaired and blind people. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2007; 2005:6912-5. [PMID: 17281864 DOI: 10.1109/iembs.2005.1616095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
This paper addresses a new concept of visuotactile human-machine interface for a certain representation of the peripersonnal space, especially useful for visually impaired and blind people navigation. The proposed space representation have been successfully implemented on a tactile device and validated via series of experiments involving naive blindfolded sighted people. Results show that is possible to interact with the space via the proposed tactile representation.
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Pissaloux E, Maingreaud F, Velazquez R, Hafez M. Space cognitive map as a tool for navigation for visually impaired. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2006; 2006:4913-4916. [PMID: 17946658 DOI: 10.1109/iembs.2006.260371] [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
Human navigation is based on space mental representations built from several sensory data. This paper investigates the interaction between the visual and tactile modalities during navigation within the experimental platform "perception-movement". A new space representation for navigation and its visual-to-tactile coding are proposed. Four experiments have validated this new coding through some basic navigation tasks. Results obtained show that it is possible to integrate the proposed space representation into a portable navigation tool which could be useful for navigation assistance of the blind/visual impaired.
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Hafez M, Sharaf L, Seafan FA. The inheritance of susceptibility to lichen planus. Indian J Dermatol 2006. [DOI: 10.4103/0019-5154.25220] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Eckman K, Hafez M, Jaramaz B, DiGioia A. Measuring pelvic flexion from lateral radiographs. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)85359-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Eckman K, Hafez M, Jaramaz B, DiGioia A. Anterior-posterior radiographs and pelvic flexion. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)85360-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Klein G, Reuter G, Hafez M. [Test schemes for evaluation of the effect of a probiotic feed additive on the gut microflora of young calves and newly hatched turkeys]. DTW. DEUTSCHE TIERARZTLICHE WOCHENSCHRIFT 2004; 111:201-4. [PMID: 15233339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Probiotic feed additives have to undergo a strict assessment according to EU regula-tions, including the evaluation of the influence on the gut microflora of the host animal. A probiotic strain of the genus Enterococcus faecium and two different host animal species, young calves and newly hatched turkeys, were chosen as a test model for the establishment of schemes for feeding trials. Investigations included faeces samples and pooled swab samples of faeces as well as samples from gut sections derived from diagnostic slaughtering. The samples were tested for aerobic total count, for enterococci count and for Enterobacteriaceae and E. coli. The test schemes were appropriate for the evaluation of the influence of the probiotic feed additive on the physiological gut microflora of the host animals. Additional information could be gathered concerning safety aspects and effectiveness.
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Hafez M, . SH, . ZM, . AELH, . HM, . MH, . BELD. Delayed Lymphocyte Apoptosis in Rheumatic Heart Disease. JOURNAL OF MEDICAL SCIENCES 2002. [DOI: 10.3923/jms.2003.46.65] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Hafez M, . MEZ, . AHA, . S, . EAH, . AH, . LB, . MMH. Inherited Susceptibility to Hyperandrogenic Manifestations In Pubertal Females: Idiopathic and Dyshormonogenesis. JOURNAL OF MEDICAL SCIENCES 2002. [DOI: 10.3923/jms.2002.158.164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Hafez M, . MELZ, . SH, . ZELM, . AS, . MS, . ARELH, . MMH, . RELB, . BELD. Implications of TNF-α, sFas and Apoptosis in Insulin Dependent Diabetes Mellitus. JOURNAL OF MEDICAL SCIENCES 2002. [DOI: 10.3923/jms.2002.95.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Hafez M, Morsy ZEL, Shennawy FEL, Hawas S, Sheishaa A, Kheir MAEL, Shokeir M, Marsafawy HA, Baz REL, Atia G. Susceptibility to Over Production of Cytokines in Acute Rheumatic Carditis and Their Role in the Pathogenesis. JOURNAL OF MEDICAL SCIENCES 2002. [DOI: 10.3923/jms.2002.65.73] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Hussein AA, El-Karef E, Hafez M. Reconstructive surgery in spinal tumours. EUROPEAN JOURNAL OF SURGICAL ONCOLOGY 2001; 27:196-9. [PMID: 11289758 DOI: 10.1053/ejso.2000.1079] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
AIMS This study reports 21 patients who underwent reconstructive surgery for destructive spinal tumours. MATERIALS AND METHODS The mean age was 49 years (range: 39-71 years). Primary lesions were met in two cases. Secondary spinal tumours were diagnosed in 19 cases. Thirteen were breast carcinoma metastases (61.9%). The cervical spine was involved in four cases, thoracic spine in six cases, and the lumbar spine in 11 cases. One patient underwent decompression laminectomy and posterior pedicle screw stabilization. The others underwent tumour tissue excision, with spinal reconstruction with autogenous bone grafting, with or without vertebral body replacement prosthesis. Anterior and posterior stabilization of the vertebral column was also used. RESULTS The objectives of surgery were achieved, in that early ambulation, easier nursing care, pain relief and neurological recovery were reported in all cases. No surgery-related complications were encountered. CONCLUSIONS We recommend surgical intervention for such lesions where reasonable longevity is anticipated.
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Hafez M. Preconcentration and separation of total mercury in environmental samples using chemically modified chloromethylated polystyrene-PAN (ion-exchanger) and its determination by cold vapour atomic absorption spectrometry. Talanta 2001; 53:749-60. [DOI: 10.1016/s0039-9140(00)00524-5] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2000] [Revised: 07/24/2000] [Accepted: 07/25/2000] [Indexed: 11/25/2022]
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Ramadan M, Hafez M, El-Mougy F. Clinical, endocrine and genetic evaluation of twenty patients with male pseudohermaphroditism (MPH). Int J Gynaecol Obstet 2000. [DOI: 10.1016/s0020-7292(00)81989-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Sousou S, Dabit S, Karaki R, Taher M, Khalifeh F, Sarraf M, Ghizawi I, Hafez M, Fittiani R. R-113. Assisted hatching in poor prognosis patients: does it help? Hum Reprod 1999. [DOI: 10.1093/humrep/14.suppl_3.329-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Yates SC, Hafez M, Beld M, Lukashov VV, Hassan Z, Carboni G, Khaled H, McMorrow M, Attia M, Goudsmit J. Hepatocellular carcinoma in Egyptians with and without a history of hepatitis B virus infection: association with hepatitis C virus (HCV) infection but not with (HCV) RNA level. Am J Trop Med Hyg 1999; 60:714-20. [PMID: 10348253 DOI: 10.4269/ajtmh.1999.60.714] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The aim of this study was to analyze the association of hepatocellular carcinoma (HCC) with hepatitis C virus (HCV) in Egypt, using hepatitis B virus (HBV) and hepatitis E virus (HEV) as virus controls. In addition, the association of HCC with HCV RNA levels among persons seropositive for HCV was analyzed. We compared 131 patients with proven HCC, 247 with bladder cancer, and 466 healthy hospital employees. Age, sex, and place of residence were recorded to study confounding factors. Among the healthy controls, 16% were seropositive for HCV, 21% for HBV, and 31% for HEV. When healthy controls were age-matched with HCC patients, the latter were significantly (P < 0.001) more often HCV seropositive (67%) than were the controls (30%). The seropositivity for HBV and HEV did not differ significantly in frequency between the two groups. The seropositivity for HCV was also significantly (P < 0.001) more often found in HCC patients (76%) than in BC patients (47%), with seroprevalences for HBV and HEV not differing significantly in these age-matched groups. In HBV-negative HCC and bladder cancer patients, seroprevalence for HCV was significantly (P = 0.002) higher in HCC patients (68%) than in bladder cancer patients (36%). This difference was even more pronounced (P < 0.001) in HBV-positive HCC and bladder cancer patients (78% versus 52%, respectively). Of HCV-seropositive individuals, 49% were HCV RNA positive by branched DNA assay, and of these, 96% were infected by HCV genotype 4. No correlation between HCV RNA load and seropositivity of HBV or age or disease state was found. Infection with HCV and HCV-HBV double infection, but not HBV or HEV infection alone, is strongly correlated with HCC in Egypt.
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Duquesnoy P, Roy A, Dastot F, Ghali I, Teinturier C, Netchine I, Cacheux V, Hafez M, Salah N, Chaussain JL, Goossens M, Bougnères P, Amselem S. Human Prop-1: cloning, mapping, genomic structure. Mutations in familial combined pituitary hormone deficiency. FEBS Lett 1998; 437:216-20. [PMID: 9824293 DOI: 10.1016/s0014-5793(98)01234-4] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Prop-1 is a newly isolated pituitary-specific paired-like homeodomain transcription factor whose cDNA sequence is well known in mouse. To study its involvement in human combined pituitary hormone deficiency (CPHD), we have isolated the human cDNA ortholog and determined the exon/intron organization and chromosomal localization of the human gene. A Prop-1 defect was characterized in three CPHD families. One missense mutation (R73C) involves a residue conserved in 95% of the more than 400 homeodomain proteins so far identified; in vitro splicing assays demonstrated the functional importance of the second defect, whereas the remaining mutation is a frameshift. Given the disease phenotype documented in the patients, these data, which will facilitate molecular investigations in other patients, demonstrate the crucial role of Prop-1 in the proper development of somatotrophs, lactotrophs, thyreotrophs and gonadotrophs.
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Hafez M, Zaki FN, Moursy A, Sabbour M. Biological effects of the entomopathogenic fungus,Beauveria bassiana on the potato tuber mothPhthorimaea operculella (Seller). ACTA ACUST UNITED AC 1997. [DOI: 10.1007/bf01907353] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hsu S, Huang F, Hafez M, Winawer S, Friedman E. Colon carcinoma cells switch their response to transforming growth factor beta 1 with tumor progression. CELL GROWTH & DIFFERENTIATION : THE MOLECULAR BIOLOGY JOURNAL OF THE AMERICAN ASSOCIATION FOR CANCER RESEARCH 1994; 5:267-75. [PMID: 8018559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Transforming growth factor beta 1 (TGF-beta 1) switches from an inhibitor of tumor cell growth to a stimulator of growth and invasion during human colon carcinoma progression. We originally observed that metastatic colon carcinoma cells in primary culture responded to TGF-beta 1 by proliferation, whereas moderate to well-differentiated primary site colon carcinomas were growth inhibited by TGF-beta 1 (P. Schroy et al., Cancer Res., 50: 261-265, 1990). We then cloned several colon carcinoma cell lines which modeled these responses to TGF-beta 1 and expressed TGF-beta 1 (M. M. Hafez et al., Cell Growth & Differ., 1: 617-626, 1990; 3: 753-762, 1992). Two of these colon carcinoma cell lines, U9 and HD3, which activate approximately equal amounts of TGF-beta 1 and express equal amounts of TGF-beta receptors, are now used to compare the effects of TGF-beta 1 in modulating invasive behavior. The U9 cell line exhibits autocrine-positive growth regulation in vitro by TGF-beta 1, whereas the HD3 cell line shows the opposite response, autocrine-negative regulation. Blocking endogenous TGF-beta 1 with isotype-specific antibody inhibited U9 cell growth because autocrine TGF-beta 1 acts as a mitogen for U9 cells. In contrast, antibody to TGF-beta 1 stimulated HD3 cell proliferation because autocrine TGF-beta 1 inhibits growth of these cells. U9 cells were 13-fold more invasive in vitro through a collagen I layer than HD3 cells.(ABSTRACT TRUNCATED AT 250 WORDS)
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