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Lopez-Cornejo P, Bote B, Felix R, Infantes I, Lopez P, Martin A, Mateos E, Perez M, Rojas A, Suarez R. Binding of Ru(NH3)5pz2+ to 4-sulfocalix[4]arene sodium salt. Effects of the host-guest interaction on electron transfer processes. J Phys Chem B 2009; 113:12721-6. [PMID: 19722494 DOI: 10.1021/jp903715t] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reactions [Ru(NH3)5pz]2++S2O8(2-) and [Ru(NH3)5pz]2++[Co(C2O4)3]3- have been studied in solutions of 4-sulfocalix[4]arene sodium salt. Results show a binding of the ruthenium complex to the calixarene with a 2:1 stoichiometry; that is, a ruthenium molecule binds to two calixarene molecules. This stoichiometry changes when NaCl is added to the medium. Thus, a mixture of 1:1 and 2:1 adducts is found in the presence of 0.1 mol dm(-3) NaCl and only 1:1 adducts when the salt concentration is increased up to 0.3 mol dm(-3). Results show that the binding of the ruthenium complex to the calixarene is due to electrostatic and nonelectrostatic interactions. Kinetic data are interpreted by using the pseudophase model and taking into account the stoichiometry of the ruthenium binding to calixarene. The presence of a supporting electrolyte in the medium produces ion pair formation which exerts an influence on the kinetic rate constants.
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Suarez R, Jimenez M, Romo R, Mendez V, Vargas M, Fernandez-Sanchez M. Down's syndrome risk prevalence related to tobacco smoking in ART patients. Fertil Steril 2008. [DOI: 10.1016/j.fertnstert.2008.07.805] [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]
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Gonzalez M, Romo R, Jimenez M, Suarez R, Mendez V, Fernandez-Sanchez M. Nurse approach to patient's mood previous to embryo transfer and βhCG test. Fertil Steril 2008. [DOI: 10.1016/j.fertnstert.2008.07.806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Lucas M, Suarez R, Marcos A, Solano F, Venegas A, Garcia-Sanchez MI, Ortiz L, Izquierdo G. Arg113His mutation of vanishing white matter is not present in multiple sclerosis. Mult Scler 2007; 13:424-7. [PMID: 17439913 DOI: 10.1177/1352458506070248] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Vanishing white matter (VWM) is a childhood leukoencephalopathy with central hypomyelination, white matter rarefaction, and cystic degeneration. Adult onset, variable phenotype, and high frequency characterize Arg113His mutation caused by G338A polymorphism associated with VWM. A patient with trauma-associated onset, and clinical features compatible with multiple sclerosis (MS), was homozygous for G338A mutation of eukaryotic translation initiation factor (eIF2B5). The authors checked a cohort of 101 MS patients, including 19 with head/neck trauma-associated onset, and failed to find the mutation, described above, in MS chromosomes. Our report does not exclude the presence in MS chromosomes of other mutations in the eIF2B gene family. Multiple Sclerosis 2007; 13: 424-427. http://msj.sagepub.com
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Renison D, Cingolani A, Suarez R, Menoyo E, Coutsiers C, Sobral A, Hensen I. The Restoration of Degraded Mountain Woodlands: Effects of Seed Provenance and Microsite Characteristics on Polylepis australis Seedling Survival and Growth in Central Argentina. Restor Ecol 2005. [DOI: 10.1111/j.1526-100x.2005.00015.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Caris L, Suarez R, Covarrubias G, Fernández E, Roca E. Rapid assessment of drug consumption at Santa Cruz de la Sierra, Bolivia. BULLETIN ON NARCOTICS 1998; 48:99-119. [PMID: 9839039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The present paper describes a rapid assessment carried out in 1996 at Santa Cruz de la Sierra, Bolivia, with a view to defining the sociocultural groups at risk and gaining insight, through the comments of those interviewed, into their perceptions of the phenomenon of drug abuse, their reasons for abusing drugs, the drugs most frequently abused and the psychological and social factors involved when they enter, remain in and finally leave drug-abusing circles. By using qualitative methodology and techniques it was possible to gain access to the typical world inhabited by the interviewees, and thus to characterize the subjects of the study in the light of their closest social reference points (family, peer group, education and work). Among the conclusions of the study are the following: drug abuse is a complex and dynamic phenomenon that has occurred throughout the society of Santa Cruz, fostered by cultural and economic factors; there is a need for society, and especially the Government, to devise a specific, focused and diversified range of services, both in prevention and in rehabilitation, with integration and participation being key features of such initiatives; and the mechanisms for controlling the production of drugs and drug trafficking need to be strengthened.
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Staples J, Suarez R. Honeybee flight muscle phosphoglucose isomerase: matching enzyme capacities to flux requirements at a near-equilibrium reaction. J Exp Biol 1997; 200:1247-54. [PMID: 9319107 DOI: 10.1242/jeb.200.8.1247] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In honeybee flight muscle, there are close matches between physiological flux rates and the maximal activities (Vmax; determined using crude homogenates) of key enzymes catalyzing non-equilibrium reactions in carbohydrate oxidation. In contrast, phosphoglucose isomerase (PGI), which catalyzes a reaction believed to be close to equilibrium, occurs at Vmax values greatly in excess of glycolytic flux rates. In this study, we measure the Vmax of flight muscle PGI, the kinetic parameters of the purified enzyme, the apparent equilibrium constants for the reaction and the tissue concentrations of substrate and product. Using the Haldane equation, we estimate that the forward flux capacity (Vf) for PGI required to achieve physiological glycolytic flux rates is between 800 and 1070 units ml-1 cell water, approximately 45­60 % of the empirically measured Vmax of 1770 units ml-1 cell water at optimal pH (8.0) and low ionic strength (no added KCl). When measured at physiological pH (7.0) and ionic strength (120 mmol l-1 KCl) with saturating levels of substrate, PGI activity is 1130 units ml-1 cell water, a value close to the calculated Vf. These results reveal a very close match between predicted and measured PGI flux capacities, and support the concept of an economical design of muscle metabolism in systems working at very high metabolic rates.
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Vargas R, Hewes B, Rego A, Farhat MY, Suarez R, Ramwell PW. Estradiol effect on rate of proliferation of rat carotid segments: effect of gender and tamoxifen. J Cardiovasc Pharmacol 1996; 27:495-9. [PMID: 8847865 DOI: 10.1097/00005344-199604000-00007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Using organ culture of carotid artery segments from sexually mature male and female rats, we examined the effect of estradiol 17 beta on proliferation. The index of cell proliferation was [3H]thymidine uptake. Estradiol 17 beta (0.18-0.36 microM) inhibited the uptake of thymidine in a concentration-dependent manner (p < 0.05). Estradiol 17 beta inhibited [3H]thymidine uptake only in the absence of the weak estrogen receptor agonist phenol red and in carotid artery segments from sexually mature female (p < 0.01) but not male rats. Tamoxifen (0.1 and 1 microM), a partial agonist of estrogen receptors, significantly inhibited thymidine uptake (p < 0.01). However, preincubation of the segments with tamoxifen (0.1 and 1.0 microM) for 4 h before the exposure to estradiol, blocked estradiol 17 beta-induced inhibition of thymidine uptake (p < 0.05 and p < 0.01 for 0.1 and 1.0 microM, respectively). The cyclooxygenase inhibitor indomethacin (5 microM) did not affect either the basal [3H]thymidine uptake or the estradiol 17 beta-induced inhibition of that uptake. This latter finding suggests that prostacyclin or prostaglandin E2 does not mediate the inhibitory response to estradiol 17 beta. The results of these experiments suggest that estradiol 17 beta-induced inhibition of proliferation of rat carotid artery segments is mediated through activation of estrogen receptors.
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Tormo C, Calvo R, Ferrandis S, Parra V, Maravall JL, Lacuevo V, Dreyfuss D, Mier L, Leviel F, Lanore JJ, Djedaïni K, Costa F, Paillard M, Del Rio F, Cardenal C, De Castro J, Blesa A, Martín-Benitez J, Hermo B, Suarez R, Martín SF, Le Cacheux P, de Ligny BH, Cardineau E, Ryckelvnck JP, Marggraf G, Schumann V, Doetsch N, Wagner K, Philipp T, Reidemeister JC, Aykaç B, Öz H, Sun S, Bozkurt P, Cotonel B, Mercatello A, HadjAïssa A, Chery C, Pozet N, Clermont N, Bégou C, Tissot E, Fisher LP, Moskovtchenko JF, Laurent V, Coronel B, Bret M, Colon S, Colpart JJ, Woittiez AJJ, Drenth IM, Jamali M, Bollaert PE, Cao T, Bauer P, Kessler M, Lambert H, Larcan A, Rogiere PE, Leeman M, Kahn RJ, Vincent JL, Nagler J, Neels H, Singer M, Screaton G, McNally T, Mackie I, Machin S, Cohen S, Haller M, Schönfelder R, Briegel J, Jauch KW, Zwiebel F, Forst H, Sicignano A, Vesconi S, Bellato V, De Pietri P, Minuto A, Foroni C, Comité C, Caprioli R, Gemignani R, Stefani M, Russo V, Mazzei A, Rusehi R, Pardelli M, Matamis D, Tsagourias M, Melekos T, Bitzani M, Rodini I, Rigos D, Inglis TJJ, Kuteifan K, Martin-Barbaz F, Man NK, Descamps JM, Bosch FH, van Genderen W, van Leusen R, de Boer JP, Creasey AA, Chang A, Roem D, Eerenberg AJM, Brouwer MC, Hack CE, Taylor FB. Kidney. Intensive Care Med 1992. [DOI: 10.1007/bf03216356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Natelson BH, Tapp WN, Drastal S, Suarez R, Ottenweller JE. Hamsters with coronary vasospasm are at increased risk from stress. Psychosom Med 1991; 53:322-31. [PMID: 1882013 DOI: 10.1097/00006842-199105000-00006] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Results of earlier experiments suggested that hamsters with inherited heart disease were at a higher risk of succumbing to stress during the vasospastic, lesion-forming period of their lives rather than later when the process of congestive heart failure had begun. To test this hypothesis, we stressed cardiomyopathic hamsters (CMH) whose ages differed by about 3 months; the younger of the two groups of stressed hamsters was in the vasospastic phase of the disease. The stressor was cold immobilization in which stressor intensity was manipulated using two durations of cold exposure. Log rank survival curves revealed no difference in mortality with the more intense stressor. However, significantly fewer of the older hamsters succumbed to the less intense stressor (46% as compared with 85% of the younger CMHs). Examination of the hearts in the experiment where mortality rate was the same for both groups revealed evidence of cardiac dilatation, indicative of heart failure, only in the older hamsters following stress. Since the younger hamsters did not show these changes and since they, but not the older animals, have coronary microvascular spasm and an increased susceptibility to stress, it would appear that the process of coronary vasospasm should be viewed as an independent and additional risk factor in determining the consequences of stress. Because of the effects of stress in the younger cardiomyopathic hamster, we believe that a neural link--which can be activated by stress--may be involved in the pathogenetic process of coronary vasospasm.
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Sheahan K, Page DV, Kemper T, Suarez R. Childhood sudden death secondary to accidental aspiration of black pepper. Am J Forensic Med Pathol 1988; 9:51-3. [PMID: 3354525 DOI: 10.1097/00000433-198803000-00014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The case history is presented of a 4-year-old boy, with a history of pica, who aspirated table pepper with subsequent respiratory arrest, severe anoxia, and death. We believe this to be the first case reported in the literature of fatal accidental aspiration of pepper.
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White RH, Suarez R, Lee MJ. Impaction and disintegration of a swallowed table knife. JOURNAL OF THE ROYAL COLLEGE OF SURGEONS OF EDINBURGH 1987; 32:62-4. [PMID: 3560025] [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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Desenne JJ, Suarez R, Sanchez M. Levels of IgE and delayed type skin reactivity in Hodgkin's disease with and without eosinophilia. Am J Med 1986; 81:1118-9. [PMID: 3799651 DOI: 10.1016/0002-9343(86)90430-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Suarez R, Lynn AH. Echo-free renal masses on ultrasound: the stethoscope as an adjunct to their diagnosis. Postgrad Med J 1985; 61:363-4. [PMID: 3895208 PMCID: PMC2418227 DOI: 10.1136/pgmj.61.714.363] [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: 01/07/2023]
Abstract
A patient with an intrarenal arteriovenous malformation is described. Ultrasound suggested this to be a renal cyst but auscultation revealed a loud bruit and, on the basis of this, arteriography rather than cyst puncture was carried out.
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Abstract
One hundred forty-six patients with clinically nonmetastatic carcinoma of the prostate were treated at Columbia-Presbyterian Medical Center from 1964 through 1976. Of these 146 patients, 24 (16.4%) had developed at least one additional primary cancer. This review contrasts the 122 patients who had a single primary prostate cancer only with the 24 patients who had additional primary carcinomas with respect to age, racial distribution, clinical stage, and prostate cancer histology including Gleason's score, patterns of failure of prostate cancer, and survival data. Local failure and distant failure were less in the multiple primary group. Patients with high Gleason's scores appear to be at greater risk for second primaries. Five-year observed survival (by actuarial life table method) for the single prostate primary group was 76.5%, and 5-year observed survival of the prostate multiple primary group where prostate cancer appeared first was 71%.
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Cornell DG, Suarez R, Berent S. Psychomotor retardation in melancholic and nonmelancholic depression: cognitive and motor components. JOURNAL OF ABNORMAL PSYCHOLOGY 1984. [PMID: 6725748 DOI: 10.1037//0021-843x.93.2.150] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Cornell DG, Suarez R, Berent S. Psychomotor retardation in melancholic and nonmelancholic depression: cognitive and motor components. JOURNAL OF ABNORMAL PSYCHOLOGY 1984; 93:150-7. [PMID: 6725748 DOI: 10.1037/0021-843x.93.2.150] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Cantor JO, Osman M, Cerreta JM, Suarez R, Mandl I, Turino GM. Amiodarone-induced pulmonary fibrosis in hamsters. Exp Lung Res 1984; 6:1-10. [PMID: 6734540 DOI: 10.3109/01902148409087891] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Amiodarone, a cardiac antiarrhythmic agent, has been associated with the development of interstitial pulmonary fibrosis in patients receiving prolonged therapy with the drug. To further assess the toxic effects of amiodarone on lung tissue, Syrian hamsters were given a single intratracheal insufflation of the agent and evaluated for histologic evidence of lung injury. Control animals received intratracheal insufflations of the vehicle in which amiodarone was dissolved. After an initial, transient alveolitis in both experimental and control animals, the amiodarone-treated lungs developed increased interstitial thickening due to fibrinous exudates, alveolar epithelial hyperplasia, inflammatory cell infiltrates, and marked deposition of collagen manifested on trichrome staining. Controls, in contrast, showed nearly complete resolution of the initial alveolitis. An unusual feature of the amiodarone-induced lung injury was reemergence of the alveolitis between 5 and 14 days, which included a marked influx of eosinophils into the lung. Although the precise mechanism of the lung injury is not known, the persistence of the acute inflammatory cells as well as the presence of eosinophils suggests a hypersensitivity-type reaction. Furthermore, the progression of lung injury to fibrosis after a single insult with the drug suggests that mere discontinuation of amiodarone therapy in humans may not reverse the disease process, but that corticosteroid therapy may also be required. Amiodarone appears to be a useful agent to induce diffuse fibrotic reactions in the lung that morphologically resemble idiopathic pulmonary fibrosis in humans.
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Valdivia Alvarez JA, Jimenez Misas CA, Rodriguez R, Mederos Cuervo L, Echemendia Font M, Valdes L, Suarez R, Gonzalez R, Romero V, Heredia C, Tudela H, Hernandez M, Ruiz Landa A, Alvarez J. [Cooperative study of resistance to antibacilli drugs in M. Tuberculosis strains isolated from Tuberculosis patients. (Preliminary study)]. REVISTA CUBANA DE MEDICINA TROPICAL 1982; 34:119-25. [PMID: 6820701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Nissenblatt MJ, Suarez R. Pseudofontanelle in multiple myeloma. JAMA 1981; 245:2298. [PMID: 7230455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Menezo JL, Suarez R, Francés J. Clinical survey of the forms, number and localization of retinal tears in cases of relapses and recurrences in retinal detachment. Ophthalmologica 1977; 174:210-6. [PMID: 859714 DOI: 10.1159/000308604] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This study deals with the clinical observations of the different forms and shapes of retinal tears, their number and localizations in cases of relapses and recurrences in retinal detachement surgery. Two groups of patients were considered, the first belongs to our own centre and the second to referred patient operated in other hospitals. 45.1% of both groups account for relapses. We find 7.35% of undetected retinal breaks. The greater number of tears are mainly distributed in the temporal quandrants. The most common shapes of breaks are the punched-out hole, fingernail-tip-like tears, small and medium horseshoe tears, oval and 'pebbled'-like (cluster of microholes) holes. Approximately 25% of the breaks were seen in areas where thermotherapy had not been applied and 15% of them were found beside most probably overtreated areas.
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Pascasio FM, Suarez R, Manuel-Limson GA, Gonzales-Germar EG. Serum protein changes in hydatidiform moles. Am J Obstet Gynecol 1970; 107:972-3. [PMID: 5429030 DOI: 10.1016/s0002-9378(16)34064-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Suarez R. The silent patient in group therapy. JOURNAL OF PSYCHIATRIC NURSING AND MENTAL HEALTH SERVICES 1970; 8:10-2. [PMID: 4319034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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