PubRank

S A Ahmed

Author PubWeight™ 74.90‹?›

Top papers

Rank Title Journal Year PubWeight™‹?›
1 Three-dimensional structure of the tryptophan synthase alpha 2 beta 2 multienzyme complex from Salmonella typhimurium. J Biol Chem 1988 3.52
2 Intracellular concentrations of water and of the principal electrolytes determined by analysis of isolated human leucocytes. Clin Sci 1969 2.42
3 Blood pre-donation deferrals--a teaching hospital experience. Southeast Asian J Trop Med Public Health 2008 1.58
4 Estrogen increases the number of plasma cells and enhances their autoantibody production in nonautoimmune C57BL/6 mice. Cell Immunol 1998 1.15
5 Velocity measurements in steady flow through axisymmetric stenoses at moderate Reynolds numbers. J Biomech 1983 1.13
6 Tryptophan synthase from Escherichia coli and Salmonella typhimurium. Methods Enzymol 1987 1.13
7 The beta subunit of tryptophan synthase. Clarification of the roles of histidine 86, lysine 87, arginine 148, cysteine 170, and cysteine 230. J Biol Chem 1989 1.11
8 Structure of NADH peroxidase from Streptococcus faecalis 10C1 refined at 2.16 A resolution. J Mol Biol 1991 1.11
9 A dye-based lymphocyte proliferation assay that permits multiple immunological analyses: mRNA, cytogenetic, apoptosis, and immunophenotyping studies. J Immunol Methods 1997 1.11
10 Expression, purification, and efficacy of the type A botulinum neurotoxin catalytic domain fused to two translocation domain variants. Toxicon 2003 1.10
11 Congenital chloride diarrhoea in Kuwaiti children. Eur J Pediatr 1989 1.04
12 Crystal structures of a mutant (betaK87T) tryptophan synthase alpha2beta2 complex with ligands bound to the active sites of the alpha- and beta-subunits reveal ligand-induced conformational changes. Biochemistry 1997 1.03
13 Thyroid transplantation developing autoimmune thyroiditis following thymectomy and irradiation. Clin Exp Immunol 1981 1.00
14 Combination hyperthermia and radiation therapy for malignant melanoma. Cancer 1982 1.00
15 Analysis of avian lymphocyte proliferation by a new, simple, nonradioactive assay (lympho-pro). Avian Dis 1997 0.99
16 Sex hormones and the immune system--Part 2. Animal data. Baillieres Clin Rheumatol 1990 0.98
17 Response rate of Malaysian blood donors with reactive screening test to transfusion medicine unit calls. Southeast Asian J Trop Med Public Health 2009 0.98
18 Vitamin-D-deficiency rickets in Kuwait: the prevalence of a preventable disease. Ann Trop Paediatr 1989 0.97
19 Ligand-mediated changes in the tryptophan synthase indole tunnel probed by nile red fluorescence with wild type, mutant, and chemically modified enzymes. J Biol Chem 1995 0.97
20 The antimicrobial activity of garlic and onion extracts. Pharmazie 1983 0.95
21 Prevention of autoantibody formation and prolonged survival in New Zealand black/New Zealand white F1 mice fed dehydroisoandrosterone. J Clin Invest 1985 0.95
22 Zidovudine induced pure red cell aplasia: a case report. Niger J Med 2010 0.93
23 17 beta-estradiol, but not 5 alpha-dihydrotestosterone, augments antibodies to double-stranded deoxyribonucleic acid in nonautoimmune C57BL/6J mice. Endocrinology 1994 0.93
24 Mechanisms contributing to myocardial accumulation of technetium-99m stannous pyrophosphate after coronary arterial occlusion. Am J Cardiol 1977 0.91
25 Recommendations for water supply in arsenic mitigation: a case study from Bangladesh. Public Health 2000 0.89
26 Synthesis, characterization and structure effects on selectivity properties of silica gel covalently bonded diethylenetriamine mono- and bis-salicyaldehyde and naphthaldehyde Schiff(,)s bases towards some heavy metal ions. Talanta 2001 0.89
27 Evidence for a vesicle-mediated maintenance of store-operated calcium channels in a human embryonic kidney cell line. Cell Calcium 2000 0.88
28 Folding of homologous proteins: conservation of the folding mechanism of the alpha subunit of tryptophan synthase from Escherichia coli, Salmonella typhimurium, and five interspecies hybrids. Biochemistry 1988 0.88
29 Adolescent abuse in a community sample in Beni Suef, Egypt: prevalence and risk factors. East Mediterr Health J 2006 0.87
30 Exchange of K+ or Cs+ for Na+ induces local and long-range changes in the three-dimensional structure of the tryptophan synthase alpha2beta2 complex. Biochemistry 1996 0.87
31 Purification and properties of the Escherichia coli K-12 NAD-dependent nucleotide diphosphosugar epimerase, ADP-L-glycero-D-mannoheptose 6-epimerase. J Biol Chem 1994 0.86
32 The influence of testosterone on the development of autoimmune thyroiditis in thymectomized and irradiated rats. Clin Exp Immunol 1982 0.86
33 Comparison of multiple assays for kinetic detection of apoptosis in thymocytes exposed to dexamethasone or diethylstilbesterol. Cytometry 1999 0.86
34 Flow disturbance measurements through a constricted tube at moderate Reynolds numbers. J Biomech 1983 0.86
35 Microspectrophotometric studies on single crystals of the tryptophan synthase alpha 2 beta 2 complex demonstrate formation of enzyme-substrate intermediates. J Biol Chem 1989 0.86
36 Pulsatile poststenotic flow studies with laser Doppler anemometry. J Biomech 1984 0.86
37 CD5 B cells in autoimmunity. Ann N Y Acad Sci 1992 0.86
38 Hematological reference values of healthy Malaysian population. Int J Lab Hematol 2008 0.86
39 Pathological changes in inbred strains of mice following early thymectomy and irradiation. Experientia 1981 0.85
40 PCR mutagenesis and overexpression of tryptophan synthase from Salmonella typhimurium: on the roles of beta2 subunit Lys-382. Protein Expr Purif 1996 0.85
41 Site-specific mutagenesis of the alpha subunit of tryptophan synthase from Salmonella typhimurium. Changing arginine 179 to leucine alters the reciprocal transmission of substrate-induced conformational changes between the alpha and beta 2 subunits. J Biol Chem 1987 0.84
42 Using phenothiazines to detect micro amounts of blood in urine. Clin Chem 1981 0.84
43 Evaluation of serological transfusion-transmitted viral diseases and mutliplex nucleic acid testing in malaysian blood donors. Transfus Apher Sci 2013 0.84
44 The association of increased plasma MB CPK activity and irreversible ischemic myocardial injury in the dog. Circulation 1976 0.83
45 Temporal lobe involvement in Japanese encephalitis: problems in differential diagnosis. AJNR Am J Neuroradiol 2006 0.82
46 The effect of unilateral E.C.T. on schizophrenic delusions and hallucinations. Br J Psychiatry 1970 0.82
47 Intracellular pH measured in isolated normal human leucocytes, by using 5,5-dimethyl-2,4-oxazolidinedione under conditions of varying extracellular PCo 2 NS BICARBONATE. Clin Sci 1971 0.82
48 Imaging of the inflammatory response in ischemic canine myocardium with 111indium-labeled leukocytes. Am J Cardiol 1977 0.82
49 Trends in hepatitis B virus infection among blood donors in Kelantan, Malaysia: a retrospective study. Southeast Asian J Trop Med Public Health 2007 0.82
50 Mutations in the contact region between the alpha and beta subunits of tryptophan synthase alter subunit interaction and intersubunit communication. Biochemistry 1998 0.81
51 Monovalent cations partially repair a conformational defect in a mutant tryptophan synthase alpha 2 beta 2 complex (beta-E109A). J Biol Chem 1995 0.81
52 Quantification of infarction in cross sections of canine myocardium in vivo with positron emission transaxial tomography and 11C-palmitate. Circulation 1977 0.81
53 Animal model of human disease. Lymphocytic thyroiditis. Autoimmune thyroiditis in rats induced by thymectomy and irradiation. Am J Pathol 1982 0.80
54 The development of metastases within a field of previous irradiation: a case report. Cancer 1981 0.80
55 Hormonal approaches to immunotherapy of autoimmune disease. Ann N Y Acad Sci 1986 0.80
56 Mechanism of alpha-amino-epsilon-caprolactam racemase reaction. Biochemistry 1986 0.80
57 Effect of temperature on heavy metal toxicity to earthworm Lumbricus terrestris (Annelida: Oligochaeta). Environ Toxicol 2007 0.80
58 N-substituted phenothiazines as redox indicators in bromatometry. Talanta 1979 0.79
59 Potential and limitations of energy-transfer processes in pulsed and cw dye laser mixtures: comparison of theory and experiments. Appl Opt 1992 0.79
60 Acarboxy prothrombin (PIVKA II) as a tumour marker for hepatocellular carcinoma and other liver diseases. East Afr Med J 1995 0.79
61 Crystallization and preliminary X-ray crystallographic data of the tryptophan synthase alpha 2 beta 2 complex from Salmonella typhimurium. J Biol Chem 1985 0.78
62 Examination of temperature effects on the lasing characteristics of rhodamine cw dye lasers. Appl Opt 1990 0.78
63 Interleukin 2, T cell receptor and sex hormone studies in autoimmune mice. J Rheumatol Suppl 1987 0.78
64 Effect of multiple light scattering and self-absorption on the fluorescence and excitation spectra of dyes in random media. Appl Opt 1994 0.78
65 Prevalence of syphilis in South Sudan. J Commun Dis 1985 0.78
66 Lack of protection of ischemic myocardium by verapamil in conscious dogs. Eur J Pharmacol 1977 0.78
67 Mandates to develop non-mammalian models for chemical immunotoxicity evaluation: are fish a viable alternate to rodents? Toxicol Lett 1999 0.78
68 Purification and properties of alpha-amino-epsilon-caprolactam racemase from Achromobacter obae. FEBS Lett 1982 0.78
69 The cellular transport of magnesium in rat liver. J Gen Physiol 1970 0.77
70 Distribution pattern of haemoglobinopathies in northern areas of Pakistan. J Pak Med Assoc 1985 0.77
71 Sputum neurokinin A in Egyptian asthmatic children and adolescents: relation to exacerbation severity. Allergy 2008 0.77
72 Beta-elimination of indole from L-tryptophan catalyzed by bacterial tryptophan synthase: a comparison between reactions catalyzed by tryptophanase and tryptophan synthase. Biochemistry 1986 0.77
73 Identification of three sites of proteolytic cleavage in the hinge region between the two domains of the beta 2 subunit of tryptophan synthase of Escherichia coli or Salmonella typhimurium. Biochemistry 1986 0.77
74 Hepatitis B surface antigen in South Sudan. J Commun Dis 1984 0.77
75 Thalassemia among blood donors at the Hospital Universiti Sains Malaysia. Southeast Asian J Trop Med Public Health 2006 0.77
76 Spectral shifting by dyes to enhance algae growth. Biotechnol Bioeng 1984 0.76
77 Autoimmune lesions: is the C57BL/6 mouse strain normal or autoimmunity-prone? Immunol Today 1994 0.76
78 Dissociation equilibria of the tryptophan synthase alpha 2 beta 2 complex in saline buffer and guanidine isothiocyanate, as studied by sedimentation equilibrium. Biophys Chem 1997 0.76
79 Importance of conserved and variable C-terminal residues for the activity and thermal stability of the beta subunit of tryptophan synthase. J Biol Chem 1997 0.76
80 Effect of temperature on heavy metal toxicity to juvenile crayfish, Orconectes immunis (Hagen). Environ Toxicol 2006 0.76
81 Mutation of an active site residue of tryptophan synthase (beta-serine 377) alters cofactor chemistry. J Biol Chem 1998 0.76
82 Expression of a novel protein by regenerating hepatocytes and peripheral blood lymphocytes. Clin Diagn Lab Immunol 2001 0.75
83 Species, interindividual, and tissue specificity in endocrine signaling. Environ Health Perspect 1999 0.75
84 Provocative testing of human growth hormone release in short statured children. J Pak Med Assoc 1987 0.75
85 On the feasibility of generating cw argon laser pumped energy transfer dye laser emission in the near IR spectral region. Appl Opt 1991 0.75
86 Learning in year-old female autoimmune BXSB mice. Physiol Behav 1998 0.75
87 Addison's disease (case report). J Assoc Physicians India 1979 0.75
88 Identification of hemoglobin AC heterozygote status in a Malay family: a decision between hemoglobin electrophoresis and high performance liquid chromotography. Southeast Asian J Trop Med Public Health 2007 0.75
89 Fluorescence and gain predictions in laser dye mixtures. Appl Opt 1989 0.75
90 Phenothiazines as reagents for the detection of faecal occult blood. Clin Chim Acta 1981 0.75
91 Abdominal tuberculosis in surgical practice in northern Nigeria. Niger J Med 2011 0.75
92 Acute sporadic hepatitis non A non B clinical features and biochemical profile. J Pak Med Assoc 1989 0.75
93 Sex hormones, CD5+ (Lyl+) B-cells, and autoimmune diseases. Isr J Med Sci 1988 0.75
94 Experimental verification of a theoretical model for continuous wave energy transfer dye mixture lasers in the near infrared. Appl Opt 1992 0.75
95 Radiation doses to radiologists in the west of Scotland. Br J Radiol 1982 0.75
96 The use of ferrous sulphate for dosimetry by post. Phys Med Biol 1970 0.75
97 Intracellular pH measured in isolated normal human leucocytes by the DMO procedure. Clin Sci 1969 0.75
98 A study of immunoperoxidase technique in the immunohistopathological diagnosis of autoimmune bullous diseases. J Pak Med Assoc 1988 0.75
99 In vitro cytotoxic activity of equine lymphocytes on equine herpesvirus-1 infected allogenic fibroblasts. Vet Immunol Immunopathol 1996 0.75
100 Viability and function in lymphocytes cultured from the horse, chicken, and mouse: effects of different leukocyte enrichment techniques. J Immunoassay Immunochem 2008 0.75
101 Hepatitis non A-non B--report of a water-borne outbreak. J Pak Med Assoc 1988 0.75
102 Imaging objects hidden in scattering media using a fluorescence-absorption technique. Opt Lett 1991 0.75
103 A case of Pseudomonas pyocyaneus septicaemia with pulmonary complications. J Assoc Physicians India 1977 0.75
104 Kinetic properties of two transaminases and lactate dehydrogenase of Biomphalaria alexandrina snails, intermediate hosts of Schistosoma mansoni. Cell Mol Biol 1990 0.75
105 Functional platelet defects: a clinicopathological study of 10 cases. J Pak Med Assoc 1987 0.75
106 Carcinoid tumours in a tertiary hospital in northern Nigeria: morphological pattern and review of the literature. West Afr J Med 2014 0.75
107 Commercial dry-reagent tests as a route for staff contamination. Lab Pract 1977 0.75
108 Synthesis of some biologically active agents derived from thieno[2,3-d]pyrimidine derivatives. Pharmazie 1997 0.75
109 Induced minor malformations in the neocortex of normal mice do not alter immunological functions. Immunol Invest 2000 0.75
110 Manipulation of behavioral disorders in autoimmune mice via prolactin. Physiol Behav 1997 0.75
111 Ofloxacin--a possible breakthrough in the treatment of typhoid fever caused by chloramphenicol resistant Salmonella typhi. J Chemother 1989 0.75
112 DNCB sensitivity in healthy Pakistani subjects and patients with liver disease. Pahlavi Med J 1978 0.75
113 Genetic regulation of testosterone-induced immune suppression. Cell Immunol 1987 0.75
114 Physiological responses to temperature and haeme synthesis modifiers in earthworm Lumbricus terrestris (Annelida: Oligochaeta). Environ Toxicol 2010 0.75
115 Histiocytosis X. Ann Afr Med 2009 0.75
116 The structure of NADH peroxidase from Streptococcus faecalis at 3.3 A resolution. FEBS Lett 1990 0.75
117 Molecular air pollution monitoring by dye laser measurement of differential absorption of atmospheric elastic backscatter. Appl Opt 1973 0.75
118 Reflectance of an absorbing medium for incident light of arbitrary polarization: correlation between the oscillatory behavior and the complex plane. Appl Opt 1990 0.75
119 Non-suture intestinal anastomosis by invagination. J Small Anim Pract 1972 0.75
120 Anaemia in hospital patients in southern Sudan. Indian J Physiol Pharmacol 1985 0.75
121 The role of protein folding in the evolution of protein sequences. Cold Spring Harb Symp Quant Biol 1987 0.75
122 Patterns in 51chromium red cell survival and sequestration studies. J Pak Med Assoc 1990 0.75
123 OKB7 recognizes antigen on T-cell malignancies. Am J Clin Pathol 1987 0.75
124 Reduction of incubation time in citric acid fermentation by vermiculite. Experientia 1966 0.75
125 Leptospiral infection due to serotype castellonis of the ballum serogroup. A case report. Practitioner 1982 0.75
126 Radiological case of the month. Gallstone ileus. J Ark Med Soc 1997 0.75
127 Dracunculiasis: an approach to hasten worm expulsion. J Trop Med Hyg 1991 0.75
128 Practical method for obtaining spectral distribution of gain in energy transfer dye lasers: comparison of theory and experiment. Appl Opt 1990 0.75
129 Benzo[a]pyrene-induced hypocellularity of the pronephros in tilapia (Oreochromis niloticus) is accompanied by alterations in stromal and parenchymal cells and by enhanced immune cell apoptosis. Vet Immunol Immunopathol 1998 0.75
130 Prediction of cigarette consumption level with personality and socioeconomic variables. J Appl Psychol 1972 0.75
131 Acute sporadic viral hepatitis--a sero marker study in 50 consecutive cases. J Pak Med Assoc 1987 0.75
132 Radionuclide techniques in the diagnosis of primary hyperparathyroidism. The role of technetium 99m--thallium 201 subtraction scanning. J Pak Med Assoc 1987 0.75
133 Tc-99m DTPA dynamic renal scintigraphy in the evaluation of renal transplants: the importance of perfusion index in the diagnosis of renal allograft rejection. J Pak Med Assoc 1988 0.75
134 A brief concept of clinical immunology. J Pak Med Assoc 1975 0.75
135 A shared B-T cell phenotype in autoimmune mice bearing the lpr gene. Clin Immunol Immunopathol 1987 0.75
136 Prevalence of blood groups in tribals of South Sudan. Indian J Physiol Pharmacol 1985 0.75
137 N-substituted phenothiazines as redox indicators in titrations with chloramine-T and chloramine-B. Talanta 1980 0.75
138 Subunit assembly in the tryptophan synthase alpha 2 beta 2 complex. Stabilization by pyridoxal phosphate aldimine intermediates. J Biol Chem 1995 0.75