776
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García-Ochoa F, Romero A. The dead zone in a catalyst particle for fractional-order reactions. AIChE J 1988. [DOI: 10.1002/aic.690341120] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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777
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Lucas M, Mata R, Romero A. Comparison of the active calcium extrusion, calcium buffering capacity and ATPase activity in rabbit reticulocytes and mature red cells. BIOCHIMICA ET BIOPHYSICA ACTA 1988; 942:65-72. [PMID: 2968119 DOI: 10.1016/0005-2736(88)90275-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The purpose of the present work was to study the changes in the pattern of calcium homeostasis following the loss of intracellular organella during red cell maturation. Reticulocytes and mature red cells were prepared from anaemic rabbits blood after daily bleeding. Experimental protocols were designed to study the calcium buffering capacity in intact and digitonin-disrupted cells, the calcium pumping rate and, the Ca2+-translocating ATPase activity in the aforementioned red cells subpopulations. In digitonin-disrupted cells, a vesicular calcium pool, sharing the properties of mitochondria, could be detected in reticulocytes but no in mature red cells. Calcium content and calcium buffering capacity were significantly lower in reticulocytes than in mature red cells. The pattern of active calcium extrusion was quite similar in the two cell subpopulations, although reticulocytes had somewhat higher calcium affinity. Besides, an estimation of the calcium pumping rate gave higher values in reticulocytes than in mature erythrocytes. These values were 21 and 9 mmol/l cells per h, respectively. Maximal activities of the high-affinity (Ca2+ + Mg2+)-ATPase and basal Mg2+-ATPase were significantly higher in reticulocytes than in mature red cells, but no differences were observed regarding calcium affinity. The results show that changes in the properties of the Ca2+-translocating ATPase and intracellular calcium buffering systems are mechanisms involved in the process of red cell maturation.
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778
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Muniain MA, Mata R, Pozuelo F, Rodriguez C, Rodriguez D, Romero A, Trueba A, Spilberg I. Circadian rhythmicity in neutrophil chemotaxis. J Rheumatol Suppl 1988; 15:1044-5. [PMID: 3418638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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779
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Romero A, Segovia I, Gómez B. [Hepatic function in acute malaria]. G.E.N 1988; 42:43-7. [PMID: 3152432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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780
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Allasia D, Angelini C, Baldini A, Bianchi F, Bobisut F, Borg A, Capiluppi P, Cirio R, Derkaoui J, Faccini-Turluer ML, Frodesen AG, Gamba D, Giacomelli G, Jongejans B, Loreti M, Louedec C, Mandrioli G, Margiotta-Neri A, Marzari-Chiesa A, Pazzi R, Patrizii L, Predieri F, Romero A, Rossi AM, Sconza A, Serra-Lugaresi P, Spurio M, Tenner AG, Vignaud D. Search for fractionally charged particles in (anti)neutrino-deuterium interactions. Int J Clin Exp Med 1988; 37:219-221. [PMID: 9958538 DOI: 10.1103/physrevd.37.219] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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781
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Romero A, Vegas A, Santos A, Lopez de Lerma J. Structure of hexamethyl benzenehexacarboxylate. Acta Crystallogr C 1987. [DOI: 10.1107/s0108270187088504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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782
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Valencia Hitte R, Palomino M, Romero A. [Comparison of the diagnosis of enamel dysplasias between the dentist in general practice and the pedodontist]. ADM (ASOCIACION DENTAL MEXICANA : 1986) 1987; 44:93-5. [PMID: 3483592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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783
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Romero A, Fuentes N, Shrestha K. [Mercury concentration and gastrointestinal symptoms in patients from mines of the State of Bolívar]. G.E.N 1987; 41:41-7. [PMID: 3147206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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784
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Polo J, Romero A, Gonzalez L. The Use of Balloon Tipped CA theter to Trea T Occlusive Malfunction in CAPD Patients. Perit Dial Int 1987. [DOI: 10.1177/089686088700700118] [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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785
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Romero A, Vegas A, Santos A, Martinez-Ripoll M. Cationic ruthenium hydrido complexes containing N- and P-donor ligands. Crystal structure of carbonylhydrido(1,4-bis(cyclohexyl)-diaza-1,3-butadiene)bis-(methyldiphenylphosphine)ruthenium(II) · perchlorate. J Organomet Chem 1987. [DOI: 10.1016/0022-328x(87)80352-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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786
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Perez JE, Macchiavelli M, Leone BA, Romero A, Rabinovich MG, Goldar D, Vallejo C. High-dose alpha-tocopherol as a preventive of doxorubicin-induced alopecia. CANCER TREATMENT REPORTS 1986; 70:1213-4. [PMID: 3756942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The effectiveness of alpha-tocopherol acetate as a preventive of doxorubicin-induced alopecia was evaluated in 20 patients with different types of solid tumors. All received therapy containing doxorubicin in a dose range of 50-60 mg/m2/cycle of treatment. The observed hair loss was severe in 90% and moderate in 10% of the patients. No protective activity of alpha-tocopherol was demonstrated in this trial.
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787
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Romero A, Vegas A, Santos A. Reaction of [Ru(CO)H(NCMe)2(PPh3)2]ClO4 with 1-hydroxymethyl-3,5-dimethylpyrazole. Formation of an amidine complex. The crystal structure of [Ru(CO)H{NHCMe(Me2pz)}(PPh3)2]ClO4. J Organomet Chem 1986. [DOI: 10.1016/s0022-328x(00)99670-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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788
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Romero A, Polo JR, Garcia Morato E, Garcia Sabrido JL, Quintans A, Ferreiroa JP. Salvage of angioaccess after late thrombosis of radiocephalic fistulas for hemodialysis. Int Surg 1986; 71:122-4. [PMID: 3733357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
A retrospective study of 44 surgical procedures performed in 39 patients with late occlusions of radiocephalic fistulas for hemodialysis is reported. In 6 cases (13.6%) no apparent anatomical cause was found, and a simple thrombectomy was performed as a corrective procedure. Some sort of arterial and/or venous stenosis was present in the other 38 cases. In 11 cases with evidence of mild localized vascular stenosis we performed a thrombectomy and then an endoluminal angioplasty with a balloon catheter and Bakes dilators. In 26 cases, with more severe degrees of stenosis, we made a proximal new fistula in the distal portion of the forearm, bypassing the vascular stenosis, either end-to-end radiocephalic or with interposition of a short segment of PTFE graft. The best results were achieved with the creation of a proximal new fistula, which resulted in almost 50% cumulative patency rates at 2 years, with no immediate failures. We think that an attempt at angioaccess salvage should be made in every case of late thrombosis of radiocephalic fistulas.
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789
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Leone BA, Romero A, Rabinovich MG, Perez JE, Macchiavelli M, Strauss E. Sequential therapy with methotrexate and 5-fluorouracil in the treatment of advanced colorectal carcinoma. J Clin Oncol 1986; 4:23-7. [PMID: 3941331 DOI: 10.1200/jco.1986.4.1.23] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Twenty-nine patients with advanced colorectal carcinoma were entered in this study to evaluate the efficacy and toxicity of a sequential chemotherapeutic schedule with methotrexate (MTX), 200 mg/m2 intravenously (IV) (push injection) and 5-fluorouracil (5-FU), 1,200 mg/m2 in continuous IV infusion, using a 20-hour time interval. All patients received calcium leucovorin (LV), 25 mg, intramuscularly (IM) every six hours for eight doses beginning 24 hours after methotrexate administration. Courses were administered every 15 days. Of the 24 patients evaluable for response, 11 (46%) had major objective regressions (one complete remission [CR] and ten partial remissions [PR]). The survival rate of patients who responded to treatment was 60% at 16 months, whereas patients with no change and those in whom the disease progressed had a median survival of 9 months and 3 months, respectively. The median duration of response has not yet been reached in patients who presented objective tumor regression, and was 7.5 months in those with no change. Significant differences were found between objective regression and no change (P less than .0005) and between no change and tumor progression (P less than .05). All patients were evaluable for toxicity. There were three toxic-related deaths (10%) because of severe myelosuppresion, sepsis, and hemorrhage. These promising results, despite important toxicity, reveal the synergism between the two chemotherapeutic agents and also indicate that the response rate achieved could be a consequence of the 20-hour interval and high dose of 5-FU. Further studies are necessary to determine the optimal time interval and the adequate 5-FU dose.
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790
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Allasia D, Angelini C, Baldini A, Bertanza L, Bigi A, Bisi V, Bobisut F, Bolognese T, Borg A, Calimani E, Capiluppi P, Casali R, Ciampolillo S, Cirio R, Derkaoui J, Faccini-Turluer ML, Flaminio V, Frodesen AG, Gamba D, Giacomelli G, Huzita H, Iongejans B, Lippi I, Loreti M, Louedec C, Mandrioli G, Margiotta A, Marzari-Chiesa A, Nappi A, Pazzi R, Riccati L, Romero A, Rossi AM, Sconza A, Serra-Lugaresi P, Tenner A, Apeldoorn GW, Dam P, Eijndhoven N, Vignaud D, Visser C, Wigmans R. Q 2 dependence of the proton and neutron structure functions from neutrino and antineutrino scattering in deuterium. ACTA ACUST UNITED AC 1985. [DOI: 10.1007/bf01413595] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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791
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Allasia D, Angelini C, Baldini A, Bertanza L, Bisi V, Bobisut F, Bolognese T, Borg A, Calimani E, Capiluppi P, Ciampolillo S, Derkaoui J, Faccini-Turluer ML, Fantechi R, Flaminio V, Frodesen AG, Gamba D, Giacomelli G, Huzita H, Jongejans B, Loreti M, Louedec C, Mandrioli G, Margiotta A, Marzari-Chiesa A, Pazzi R, Ramello L, Riccati L, Romero A, Rossi AM, Sconza A, Serra-Lugaresi P, Tenner A, Vignaud D, Wigmans R. Search for micro* pi * mass enhancements in neutrino- and antineutrino-deuterium charged-current interactions. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1985; 31:2996-2998. [PMID: 9955619 DOI: 10.1103/physrevd.31.2996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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792
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Mehlman IJ, Romero A, Wentz BA. Improved enrichment for recovery of Shigella sonnei from foods. JOURNAL - ASSOCIATION OF OFFICIAL ANALYTICAL CHEMISTS 1985; 68:552-5. [PMID: 3894320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Shigella species were recovered from foods by the procedure described in the Bacteriological Analytical Manual, 5th Ed. The method is effective if Shigella species are present at about 10(6) cells/g. A 25 g food portion was incubated in Gram-negative (GN) and selenite cystine broths for 16 h at 35 degrees C and streaked onto MacConkey, Levine's eosin methylene blue, desoxycholate citrate, and xylose lysine desoxycholate agars. S. sonnei cells were recovered quantitatively at 44.5 degrees C, and along with other Shigella species, were grown with Escherichia coli in a tryptone broth under anaerobic conditions. Shigella species were also grown in a mixed microflora from foods. S. sonnei cells were inoculated into an enrichment broth containing 20 g tryptone, 2 g K2HPO4, 2 g KH2PO4, 1 g glucose, 5 g NaCl, 1.5 mL Tween 80, and 0.5 mg novobiocin/L (pH 7.0) and incubated for 20 h at 44 degrees C. Enrichments were streaked onto MacConkey agar and the plates were incubated 20 h at 35 degrees C. Suspect Shigella colonies were screened in glucose, tryptone, and lysine broths and in triple sugar iron and motility agars. The sensitivity varied from 0.3 to 1000 bacteria/g. The method has been examined with artificially inoculated lettuce, celery, brussels sprouts, mushrooms, and hamburger. It is also applicable to S. flexneri if incubation is conducted at 42 degrees C.
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793
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Romero A, Bacigalupo A, Bressani R. [Effect of the extrusion process on the functional characteristics and protein quality of quinua (Chenopodium quinoa, Willd)]. ARCHIVOS LATINOAMERICANOS DE NUTRICION 1985; 35:148-62. [PMID: 3834873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
In order to have available a human food of high nutritive value, and conscious of the protein quality of the quinua, as well as its carbohydrate, vitamin and mineral content, its behavior during the extrusion process was tested in the present study. To eliminate saponins, a simple method was developed which consisted of washing the seeds through an aluminum container, using a wooden stirrer. Seven treatments were studied: washed quinua, washed and cooked quinua, washed and expanded quinua No. 1 and No. 2, and washed and texturized quinua No. 1 and No. 2; casein was used as control. Biological evaluation trials were carried out in Holtzman rats, following the PER method. To detect the possible effects of the processed quinua on the experimental animals, hematological as well as histopathological studies of the vital organs were performed. A maximum PER of 2.43 was obtained for the texturized quinua, 2.16 for the expanded quinua, 2.6 for the cooked quinua, while the casein control yielded a PER of 3.00. The physico-chemical characteristics of the quinua flour were determined, as well as those of the expanded and texturized products. The product obtained was subjected to an organoleptic trial and it can be stated that the results obtained were satisfactory. The product can be consumed directly without major modifications and has an acceptable flavor. The nutritive value of quinua was not impaired; it compared favorably with the best diets recommended for the population, especially of those with a lower income. The results obtained in the present study suggest the possibility of increasing the nutritional value of the product, as well as its acceptability.
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794
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Krishnamoorthi R, La Mar GN, Mizukami H, Romero A. A 1H NMR comparison of the met-cyano complexes of elephant and sperm whale myoglobin. Assignment of labile proton resonances in the heme cavity and determination of the distal glutamine orientation from relaxation data. J Biol Chem 1984; 259:8826-31. [PMID: 6746625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The met-cyano complex of elephant myoglobin has been investigated by high field 1H NMR spectroscopy, with special emphasis on the use of exchangeable proton resonances in the heme cavity to obtain structural information on the distal glutamine. Analysis of the distance dependence of relaxation rates and the exchange behavior of the four hyperfine shifted labile proton resonances has led to the assignment of the proximal His-F8 ring and peptide NHs and the His-FG3 ring NH and the distal Gln-E7 amide NH. The similar hyperfine shift patterns for both the apparent heme resonances as well as the labile proton peaks of conserved resonances in elephant and sperm whale met-cyano myoglobins support very similar electronic/molecular structures for their heme cavities. The essentially identical dipolar shifts and dipolar relaxation times for the distal Gln-E7 side chain NH and the distal His-E7 ring NH in sperm whale myoglobin indicate that those labile protons occupy the same geometrical position relative to the iron and heme plane. This geometry is consistent with the distal residue hydrogen bonding to the coordinated ligand. The similar rates and identical mechanisms of exchange with bulk water of the labile protons for the three conserved residues in the elephant and sperm whale heme cavity indicate that the dynamic stability of the proximal side of the heme pocket is unaltered upon the substitution (His----Gln). The much slower exchange rate (by greater than 10(4] of the distal NH in elephant relative to sperm whale myoglobin supports the assignment of the resonance to the intrinsically less labile amide side chain.
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795
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López Acuña D, Romero A. [Perspectives in epidemiological investigation in the control and surveillance of disease]. SALUD PUBLICA DE MEXICO 1984; 26:281-96. [PMID: 6474263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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796
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Fuentes Olano C, Romero A, Martińez F. [Placental weights at the National Institute of Perinatology]. GINECOLOGIA Y OBSTETRICIA DE MEXICO 1984; 52:47-9. [PMID: 6479662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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797
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Krishnamoorthi R, La Mar GN, Mizukami H, Romero A. A proton NMR investigation of the influence of distal glutamine on structural and dynamic properties of elephant metmyoglobin. J Biol Chem 1984; 259:265-70. [PMID: 6706935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The proton NMR spectra of metmyoglobin from the Asian elephant, which has the replacement of glutamine for the usual distal histidine, are reported and analyzed. In the low pH region, we detect two interconvertible forms of the met-aquo-protein whose relative stabilities are independent of pH, but depend strongly on both temperature and solvent isotope composition. As the pH is raised, both species convert to the met-hydroxy form, as found for other myoglobins. The temperature dependence of the heme methyl shifts for both acidic protein forms indicates essentially high spin character for the iron, and the mean heme methyl shifts are interpreted as indicating one form with a very slightly weaker, and the other with a significantly stronger, axial ligand field than for the unique sperm whale met-aquo-myoglobin. The thermodynamic data for the equilibrium between the two species are consistent with differences of one hydrogen bond between coordinated water and the distal glutamine. Models are proposed where one form of the protein has not only the glutamine carboxyl oxygen acting as a hydrogen-bond acceptor, but also the amine group. We conclude that a distal glutamine can act both as a stronger and as a weaker hydrogen-bond acceptor towards coordinated water than the usual distal histidine. The relative rates of conversion of the two met-aquo-myoglobin forms to MetMbOH is found to be consistent with the proposed structures for the two forms.
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798
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Romero A, Locascio IC. [Prevention of blindness. Various clinico-epidemiological features of eye diseases]. BOLETIN DE LA OFICINA SANITARIA PANAMERICANA. PAN AMERICAN SANITARY BUREAU 1983; 94:22-36. [PMID: 6220723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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799
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Romero A. [Policies and strategies for leprosy control programs]. BOLETIN DE LA OFICINA SANITARIA PANAMERICANA. PAN AMERICAN SANITARY BUREAU 1982; 93:220-32. [PMID: 6216896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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800
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Mehlman IJ, Romero A, Atkinson JC, Aulisio C, Sanders AC, Campbell W, Cholenski J, Ferreira J, Forney E, O'Brian K, Palmieri M, Weagant S. Detection of invasiveness of mammalian cells by Escherichia coli: collaborative study. JOURNAL - ASSOCIATION OF OFFICIAL ANALYTICAL CHEMISTS 1982; 65:602-7. [PMID: 7047484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
In a collaborative study of 2 standard procedures (Procedure I, presented in J. Assoc. Off. Anal. Chem. 60, 546-562 (1977) and Procedure II in the Bacteriological Analytical Manual, 1978), 7 laboratories evaluated the invasive potential of Escherichia coli. Monolayers of HeLa cultures were infected with E. coli (infectivity ratio 100 bacteria/mammalian cell) suspended in 2 menstrua: heat-inactivated fetal bovine serum (Procedure I) and 0.2% bovine albumin Fraction V dissolved in Earle's buffered salts (Procedure II). After uptake of the bacteria, intracellular growth, and differential staining, the percentages of HeLa cells containing a minimum of 5 bacteria were determined microscopically. All laboratories correctly identified invasiveness of E. coli by Procedure I; 5 of 6 laboratories recognized invasiveness by Procedure II. Although Procedure I was more reproducible than Procedure II, repeatability did not differ significantly. Procedure I was adopted official first action for presumptive recognition of invasiveness in E. coli.
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