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Valoppi F, Calligaris S, Barba L, Nicoli MC. Compositional Phase Diagram, Rheological and Structural Properties of Systems Containing UHT Skim Milk, Sunflower Oil, Saturated Monoglycerides and Co-Surfactants. FOOD BIOPHYS 2014. [DOI: 10.1007/s11483-014-9363-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Yenamandra A, Wheeler F, Hollis A, Barba L, Wang Y, Geng L. Detection of Genomic Imbalances Involved in Common Chromosomal Rearrangements of Acute Leukemia by Cytogenomic SNP Microarray Analysis. Cancer Genet 2014. [DOI: 10.1016/j.cancergen.2014.06.018] [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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Mao L, Calligaris S, Barba L, Miao S. Monoglyceride self-assembled structure in O/W emulsion: formation, characterization and its effect on emulsion properties. Food Res Int 2014. [DOI: 10.1016/j.foodres.2014.01.042] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Barba L, Arrighetti G, Calligaris S. Crystallization and melting properties of extra virgin olive oil studied by synchrotron XRD and DSC. EUR J LIPID SCI TECH 2012. [DOI: 10.1002/ejlt.201200259] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Fumagalli E, Campione M, Raimondo L, Sassella A, Moret M, Barba L, Arrighetti G. Grazing-incidence X-ray diffraction study of rubrene epitaxial thin films. JOURNAL OF SYNCHROTRON RADIATION 2012; 19:682-687. [PMID: 22898945 DOI: 10.1107/s0909049512027562] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 06/18/2012] [Indexed: 06/01/2023]
Abstract
The growth of organic semiconductors as thin films with good and controlled electrical performances is nowadays one of the main tasks in the field of organic semiconductor-based electronic devices. In particular it is often required to grow highly crystalline and precisely oriented thin films. Here, thanks to grazing-incidence X-ray diffraction measurements carried out at the ELETTRA synchrotron facility, it is shown that rubrene thin films deposited by organic molecular beam epitaxy on the surface of tetracene single crystals have the structure of the known orthorhombic polymorph, with the (2 0 0) plane parallel to the substrate surface. Moreover, the exact epitaxial relationship between the film and the substrate crystalline structures is determined, demonstrating the presence of a unique in-plane orientation of the overlayer.
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Vohra V, Arrighetti G, Barba L, Higashimine K, Porzio W, Murata H. Enhanced Vertical Concentration Gradient in Rubbed P3HT:PCBM Graded Bilayer Solar Cells. J Phys Chem Lett 2012; 3:1820-1823. [PMID: 26291866 DOI: 10.1021/jz300710a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Graded bilayer solar cells have proven to be at least as efficient as the bulk heterojunctions when it comes to the Poly(3-hexylthiophene) (P3HT) - [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) donor-acceptor system. However, control of the vertical concentration gradient using simple techniques has never been reported. We demonstrate that rubbing the P3HT layer prior to PCBM deposition induces major morphological changes in the active layer. Using the newly introduced energy-dispersive X-ray spectroscopy element mapping technique, we found that rubbing P3HT induces the formation of an ideal vertical donor-acceptor concentration gradient. Furthermore, the P3HT crystallites undergo a molecular reorientation from edge-on to face-on configuration inducing a better charge transport in the vertical direction. The combination of these two major morphological changes leads to the fabrication of high-performance solar cells that exhibit, to date, the record efficiencies for spin-coated graded bilayers solar cells.
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Poccia N, Fratini M, Ricci A, Campi G, Barba L, Vittorini-Orgeas A, Bianconi G, Aeppli G, Bianconi A. Evolution and control of oxygen order in a cuprate superconductor. NATURE MATERIALS 2011; 10:733-736. [PMID: 21857676 DOI: 10.1038/nmat3088] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Accepted: 07/01/2011] [Indexed: 05/31/2023]
Abstract
The disposition of defects in metal oxides is a key attribute exploited for applications from fuel cells and catalysts to superconducting devices and memristors. The most typical defects are mobile excess oxygens and oxygen vacancies, which can be manipulated by a variety of thermal protocols as well as optical and d.c. electric fields. Here we report the X-ray writing of high-quality superconducting regions, derived from defect ordering, in the superoxygenated layered cuprate, La₂CuO(4+y). Irradiation of a poor superconductor prepared by rapid thermal quenching results first in the growth of ordered regions, with an enhancement of superconductivity becoming visible only after a waiting time, as is characteristic of other systems such as ferroelectrics, where strain must be accommodated for order to become extended. However, in La₂CuO(4+y), we are able to resolve all aspects of the growth of (oxygen) intercalant order, including an extraordinary excursion from low to high and back to low anisotropy of the ordered regions. We can also clearly associate the onset of high-quality superconductivity with defect ordering in two dimensions. Additional experiments with small beams demonstrate a photoresist-free, single-step strategy for writing functional materials.
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Porzio W, Scavia G, Barba L, Arrighetti G, Milita S. Depth-resolved molecular structure and orientation of polymer thin films by synchrotron X-ray diffraction. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2010.12.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Scavia G, Porzio W, Destri S, Barba L, Arrighetti G. Micro-contact printing of poly(3-hexylthiophene) on silicon oxide: Effect of stamp stretching. Eur Polym J 2010. [DOI: 10.1016/j.eurpolymj.2010.05.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Calligaris S, Pieve SD, Arrighetti G, Barba L. Effect of the structure of monoglyceride–oil–water gels on aroma partition. Food Res Int 2010. [DOI: 10.1016/j.foodres.2009.10.011] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Calligaris S, Munari M, Arrighetti G, Barba L. Insights into the physicochemical properties of coffee oil. EUR J LIPID SCI TECH 2009. [DOI: 10.1002/ejlt.200900042] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Moreau J, Giovanella U, Bombenger JP, Porzio W, Vohra V, Spadacini L, Di Silvestro G, Barba L, Arrighetti G, Destri S, Pasini M, Saba M, Quochi F, Mura A, Bongiovanni G, Fiorini M, Uslenghi M, Botta C. Highly Emissive Nanostructured Thin Films of Organic Host-Guests for Energy Conversion. Chemphyschem 2009; 10:647-53. [DOI: 10.1002/cphc.200800682] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Calligaris S, Arrighetti G, Barba L, Nicoli MC. Phase Transition of Sunflower Oil as Affected by the Oxidation Level. J AM OIL CHEM SOC 2008. [DOI: 10.1007/s11746-008-1241-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bhalla V, Nast CC, Stollenwerk N, Tran S, Barba L, Kamil ES, Danovitch G, Adler SG. Recurrent and de novo diabetic nephropathy in renal allografts. Transplantation 2003; 75:66-71. [PMID: 12544873 DOI: 10.1097/00007890-200301150-00012] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Histologic findings of diabetic nephropathy (DN) are observed in allografts of patients with pretransplant (PreTx) diabetes mellitus (DM) and in patients who develop DM posttransplant (PostTx). Patients with allograft biopsies (Bx) were retrospectively studied to determine the incidence of recurrent and de novo DN and to ascertain what, if any, risk factors predispose to histologic DN in either patient population. METHODS From the renal transplant services at four hospitals from 1992 to 2000, the authors identified all patients with PreTxDM and PostTxDM (n=81). Those with renal biopsies performed >/=18 months PostTx were classified according to the presence or absence of histologic DN (Bx-positive, n=23; Bx-negative, n=35). Patients were then subdivided into four categories-recurrent DN (n=16), de novo DN (n=7), no recurrent DN (n=27), and no de novo DN (n=8)-for analyses. RESULTS Among these 58 patients, 74.1% had PreTx and 25.9% had PostTx diabetes. Of those with histologic DN, 69.6% were recurrent DN and 30.4% were de novo DN, making de novo DN at least as likely to develop as recurrent DN. After the onset of diabetes in the de novo population, the time to development of histologic DN was similar in the recurrent and the de novo patients (6.68+/-3.86 years vs. 5.90+/-3.13 years, P=0.66) and more rapid than previously reported. Apart from a more frequent family history of hypertension in patients with allograft DN compared with those without allograft DN, known risk factors for the development of native DN did not significantly differ among patients in the four cohorts. Proposed risk factors related to transplantation did not correlate with the development of recurrent or de novo DN. CONCLUSION Among patients with histologic DN, de novo DN occurred at least as frequently as recurrent DN, and the time to onset of histologically apparent DN was more rapid than previously reported. Neither the usual clinical predictors of DN nor clinical variables related to transplantation clearly distinguished the group with DN from the group without it, potentially implicating novel mechanisms in its pathogenesis.
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Farré M, Fernandez J, Paez M, Granada L, Barba L, Gutierrez HM, Pulgarin C, Barceló D. Analysis and toxicity of methomyl and ametryn after biodegradation. Anal Bioanal Chem 2002; 373:704-9. [PMID: 12194027 DOI: 10.1007/s00216-002-1413-9] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2001] [Revised: 06/13/2002] [Accepted: 06/14/2002] [Indexed: 10/27/2022]
Abstract
The controlled biodegradation of ametryn and methomyl has been performed, in accordance with the OECD Zahn-Wellens/EMPA procedure, by use of an enriched mixture of activated sludge collected from three domestic waste-water-treatment plants (WWTP). During the process concentrations of ametryn and methomyl in the water samples were isolated by solid-phase extraction (SPE); recovery rates were 98.9 and 93.2 for methomyl and ametryn, respectively. Liquid chromatography-mass spectrometry (LC-MS) was used to determine final pesticide concentrations and for metabolite identification. The efficiency of aerobic biodegradation of ametryn and methomyl was evaluated by measuring both the decrease in the concentration of the pesticides and global properties such as the chemical oxygen demand (COD). The acute toxicity of ametryn and methomyl was evaluated by use of the ToxAlert100 biological test, which is based on inhibition of the bioluminescence of Vibrio fischeri. There was significant correlation between results from primary and ultimate biodegradation and those from determination of toxicity. Pesticide concentrations were always reduced to below the limit of detection in less than 17 days. High COD removal (90-96%) was achieved in 28 and 18 days for methomyl and ametryn, respectively.
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Adler SG, Kang SW, Feld S, Cha DR, Barba L, Striker L, Striker G, Riser BL, LaPage J, Nast CC. Glomerular mRNAs in human type 1 diabetes: biochemical evidence for microalbuminuria as a manifestation of diabetic nephropathy. Kidney Int 2001; 60:2330-6. [PMID: 11737607 DOI: 10.1046/j.1523-1755.2001.00073.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
BACKGROUND In patients with type 1 diabetes, some consider microalbuminuria to be a predictor of diabetic nephropathy while others believe it is an early feature of diabetic nephropathy. METHODS Levels of mRNAs that are of pathogenetic relevance in diabetic nephropathy were compared in glomeruli isolated from microalbuminuric and overtly proteinuric subjects and in control normoalbuminuric diabetic subjects and living renal transplant donors. RESULTS In subjects with microalbuminuria and overt proteinuria, glomerular mRNAs were virtually identical and approximately twofold higher for connective tissue growth factor (CTGF; P < 0.01) and collagen alpha2(IV) (P < 0.03) compared to living renal donors and normoalbuminuric patients. Glomerular glyceraldehyde-3-phosphate dehydrogenase (GAPDH) levels were not significantly different among the groups (P = 0.4). Weak but statistically significant correlations were noted between CTGF mRNA and albuminuria (assessed by rank), fractional mesangial surface area, and a composite renal biopsy index. Glomerular CTGF mRNA correlated inversely with creatinine clearance. Glomerular collagen alpha2(IV) mRNA levels correlated with albuminuria (by rank) and less strongly with fractional mesangial area. CONCLUSION To our knowledge, these data provide the first biochemical evidence demonstrating that the glomeruli of microalbuminuric patients and those with overt proteinuria do not differ significantly. The data support the concept that microalbuminuria is not "predictive" of diabetic nephropathy, but rather is an earlier point in the spectrum of diabetic nephropathy.
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Nourissat C, Barba L, Chambaud D, Gacon G. [Single-compartment knee arthroplasty prosthesis and idiopathic necrosis of the medial tibia surface]. REVUE DE CHIRURGIE ORTHOPEDIQUE ET REPARATRICE DE L'APPAREIL MOTEUR 2001; 87:367-72. [PMID: 11431632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
PURPOSE OF THE STUDY Idiopathic necrosis of the medial articular surface of the tibia is exceptional. Diagnosis is quite difficult and often made late. Among the different treatments proposed, we preferred single-compartment arthroplasty. MATERIAL AND METHODS We report 8 cases in women with a mean age of 71.1 years. Diagnosis was suspected due to drug-resistant knee pain, particularly frequent at night, initially with radiographically normal knees. The first radiographic signs, seen 3 months after the onset of pain, were pathognomonic for osteonecrosis evidencing subchondral defects of the tibial surface with a dense peripheral rim and apparently "sequestered" in a notch. Bone scintigraphy evidenced intense uptake in the medial compartment. MRI confirmed the diagnosis evidencing a band of low intensity signals completely surrounding a sequestered zone reaching the cortical. This band was stable and irreversible. In 5 cases CT scan and in 3 cases tomography identified the width and height of the necrotic area that was limited to the medial compartment in all cases. All patients were treated with a single compartment implant. The diagnosis of necrosis was confirmed at pathology. RESULTS At 4,6 years of mean follow up all patients had an excellent outcome, "forgetting" their knee. No lucent lines developed along the femoral or tibial implants. DISCUSSION Necrosis of the medial articular surface of the tibia is exceptional and often diagnosed late by bone scintigraphy or MRI. Surgical treatment is usually based on tibial osteotomy for valgisation or a single or three-compartment prosthesis. In our 8 cases, the necrosis was limited to the medial compartment, warranting our therapeutic option.
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Adler SG, Feld S, Striker L, Striker G, LaPage J, Esposito C, Aboulhosn J, Barba L, Cha DR, Nast CC. Glomerular type IV collagen in patients with diabetic nephropathy with and without additional glomerular disease. Kidney Int 2000; 57:2084-92. [PMID: 10792628 DOI: 10.1046/j.1523-1755.2000.00058.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
BACKGROUND Type IV collagen is a constituent of mesangial matrix and is increased in amount in many forms of glomerular injury. METHODS We performed renal biopsies in patients who (1) were donating a kidney to a relative (LRD, N = 6), (2) had diabetic glomerulopathy with or without nephrosclerosis (DM, N = 6), or (3) had diabetic glomerulopathy with a superimposed glomerular lesion (DM+, N = 5). Glomerular collagen alpha2(IV) and control glyceraldehyde-3-phosphate dehydrogenase (GAPDH) mRNAs were measured, and the former correlated with clinical and morphological data to assess its usefulness in reflecting glomerular injury. RESULTS Collagen alpha2(IV) mRNA levels were lowest in LRD (2.9 +/- 0.6 attomol/glomerulus), higher in DM (5.9 +/- 1.6, P = 0.05), and highest in DM+ (12.7 +/- 2.8 attm/glomerulus, P < 0.05 vs. LRD and vs. DM). Control GAPDH mRNA levels were not significantly different (P > 0.05). Levels of proteinuria, serum creatinine, and glomerular size did not correlate with collagen alpha2(IV) mRNA levels. The fractional mesangial area and the fractional mesangial area occupied by type IV collagen were higher in both diabetic groups than in LRD (P < 10-6), but the intensity of type IV collagen staining in the diabetic patients was significantly less than that seen in the LRD (P < 0.01). In DM+ patients, extramesangial type IV collagen was present. Fractional mesangial area and glomerular collagen alpha2(IV) mRNA levels correlated (r = 0.45, P < 0.05). CONCLUSION These data are consistent with a view of diabetic nephropathy as a lesion of increased alpha2 type IV collagen transcription, increased total amount of collagen present, but decreased mesangial density relative to other matrix molecules. These data further demonstrate that glomerular injury superimposed on diabetic nephropathy contributes to additional structural damage by inducing increased synthesis of type IV collagen at extramesangial sites.
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Gacon G, Philippe M, Barba L, Frayssinet P. [Osteolysis after total knee prosthesis]. REVUE DE CHIRURGIE ORTHOPEDIQUE ET REPARATRICE DE L'APPAREIL MOTEUR 2000; 86:20-8. [PMID: 10669821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
PURPOSE OF THE STUDY The aim of our work was to study X-rays showing osteolysis after 5 years and more in 122 prosthesis and to try and assess such complication, often described in the United States but seldom in Europ. MATERIAL We are dealing here with 122 retaining posterior cruciate ligament, mostly cementless prothesis implanted between 1985 and 1992 84 chromium-cobalt prosthesis (PCA and Themis) implanted in 34 males and 88 females with an average age of 67 (45-81), 87,7 p. 100 had femoral cementless components and 70 p. 100 tibial cementless components. METHODS All patients were examined and had X-rays at an average of 6,9 years. Specially considered were X-rays showing a possible osteolysis. We looked for possible complication (external laxity, anterior femoral dislocation and polyethylene wear), assessment of the mechanical axis and for clinical results (Hungerford score) RESULTS Revisions: 19 arthroplasties were revised for PE wear tibial loosening metallosis or patella problems The postoperative score according to Hungerford was 84,5 p. 100 for PCA prosthese and 87 p.100 for the Themis. On the X-rays were only few osteolysis to be found: 9 cases (7,3 p. 100). For the PCA series: 3 femoral osteolysis, 1 tibial at 12 years, and one patellar osteolysis. For the Themis series: no femoral osteolysis, 3 tibial and one patellar osteolysis. Osteolysis are apparent on X-rays in profile for the femur and the patella, and in both profile and frontal X-rays for the tibia. Clinicaly 4 osteolysis really asymptomatic were not re-operated. 5 were revised: one 11 years later for femoral and tibial loosening, two for a patellar loosening, the other two patients had to be reoperated on for metallism (titanium's femoral component) and for those two instances osteolysis were discovered during the complication. DISCUSSION Osteolysis after TKA appears unusual in our experience without bearing on frequency finded by american authors with a lesser follow-up (Engh 11,1 p. 100 after 4,5y, Peters 16 p. 100 after 2,9 y, Robinson 9,18 p. 100 after 4,6 y). American litteratur analysis shows that the important number of osteolysis is due to: - either to dual-metal using (Co-Cr component with Titanium screws for exemple), - or bad quality of polyethylene (compressed), - or a bad design of former prosthesis. CONCLUSION Interface illness, linked to the production of wear debris, osteolysis after total knee arthroplasty is rarer than after a hip one, probably because size of debris is different, larger in knee than in hip. It is likely that the improvement of PE quality, design of prosthesis, as well as a better knowledge of osteolysis mechanism will allow to delay this complication wich is in a long term ineluctable.
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Pettinari C, Accorroni F, Cingolani A, Marchetti F, Cassetta A, Barba L. (1-Phenyl-3-methyl-4-acetylpyrazolon-5-ato)rhodium(I) complexes, synthesis, structural and spectroscopical characterization: Reactivity of diolefin- and dicarbonyl-rhodium complexes toward N-, P- and O-donors. J Organomet Chem 1998. [DOI: 10.1016/s0022-328x(98)00692-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Gliubich F, Berni R, Colapietro M, Barba L, Zanotti G. Structure of sulfur-substituted rhodanese at 1.36 A resolution. ACTA CRYSTALLOGRAPHICA SECTION D: BIOLOGICAL CRYSTALLOGRAPHY 1998; 54:481-6. [PMID: 9761843 DOI: 10.1107/s090744499701216x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
1.36 A resolution X-ray diffraction data have been recorded at 100 K for bovine liver sulfur-substituted rhodanese, using synchrotron radiation. The crystal structure has been refined anisotropically to a final R factor of 0.159 (Rfree = 0.229) for 53034 unique reflections. The model contains 2327 protein atoms and 407 solvent molecules, with a good geometry. The high resolution allows full details for helices, beta-sheets, tight turns and of all inter- and intramolecular interactions stabilizing the enzyme molecule to be given. The situation at the active site is described, particularly in regard to the network of hydrogen bonds made by Sgamma and Sdelta of the sulfur-substituted catalytic Cys247 and surrounding groups and solvent molecules. The replacement of the precipitant ammonium sulfate with cryoprotectants in the crystal-suspending medium led to the removal of the sulfate ion from the enzyme active site. Only limited changes of the enzyme structure have been found as a result of the drastic change in the crystal medium.
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Shoskes DA, Ty R, Barba L, Sender M. Prediction of early graft function in renal transplantation using a computer neural network. Transplant Proc 1998; 30:1316-7. [PMID: 9636534 DOI: 10.1016/s0041-1345(98)00257-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Shoskes DA, Avelino L, Barba L, Sender M. Patient death or renal graft loss within 3 yr of transplantation in a county hospital: importance of poor initial graft function. Clin Transplant 1997; 11:618-22. [PMID: 9408696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Our purpose was to study the factors predictive of graft loss or patient death within 3 yr of renal transplant in a county population. 363 renal transplants performed between 1984 and 1991 at the Harbor-UCLA Medical Center were reviewed. There were 16 recipients (4%) who died and 76 (21%) who lost their grafts within 3 yr. Known causes of death were cardiac (44%), infection (38%) and malignancy (6%). There was a higher proportion of diabetics (44%), hypertensives (69%) and those with a past cardiac history (38%). There was also a high delayed graft function rate (56%). Of the 76 grafts that failed in the first 3 yr, 14% were due to noncompliance, 20% to grafts that never functioned, 9% to technical problems, 21% to acute rejection, 9% to recurrent disease and 26% to chronic rejection. The noncompliance group were younger (mean 34 yr), and more likely to be a first transplant (90%) and be non-white (82%). The rejection group was significant for high delayed graft function rate (84%) and frequent and early rejection (76% at least one rejection). We conclude that fair organ allocation requires a balance between equity and utility, but patient death or graft loss within 3 yr benefits neither the patient or society. Patient survival may be improved with diligent cardiac evaluation, particularly in older patients and diabetics. Patient education and monitoring for noncompliance is essential, particularly in young first-time recipients. Maneuvers to decrease delayed graft function are essential to improve long-term results.
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Bretan PN, Koyle M, Singh K, Barba L, Ward H, Sender M, Avelino L, Rajfer J. Improved survival of en bloc renal allografts from pediatric donors. J Urol 1997; 157:1592-5. [PMID: 9112483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
PURPOSE We developed a technical and immunological protocol to increase survival of renal transplants from pediatric donors. MATERIALS AND METHODS En bloc kidneys (22) were procured from donors weighing 2 to 14 kg. (1 to 60 months old) and transplanted into adult recipients. In group 1 (12 patients) sequential therapy was used for kidneys with more than 35 hours of cold storage and immediate triple therapy (cyclosporine, azathioprine and prednisone) was used for those with less than 35 hours of cold storage. In group 2 (10 patients) OKT3 induction therapy was used. Mean followup was 4.7 years. RESULTS Mean blood pressure at 1 and 4 years was not significantly different between the groups. Mean serum creatinine was not significantly different between the groups at 1 year but it was significantly less in group 2 at 4 years (1.9 +/- 1.0 versus 1.2 +/- 0.24 mg./dl., p <0.05). At 1 year of followup the complication rate was 75% in 9 of 12 patients in group 1, including 4 infections or leaks (2 lost), 6 rejections (3 lost) and 3 cases of thrombosis or hemorrhage, and 20% (p <0.01) in group 2 (1 patient had the hemolytic uremic syndrome leading to graft loss). Graft survival was significantly greater in group 2 at all 4 years of followup (p = 0.05). CONCLUSIONS The success of pediatric en bloc renal transplantation can be enhanced by induction therapy in healthy recipients.
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Spagna R, Barba L, Camalli M, Cassetta A, Catricala' M, Marciante C, Pifferi A, Colapietro M, Portalone G. The four-circle diffractometer at ELETTRA. Acta Crystallogr A 1996. [DOI: 10.1107/s0108767396098364] [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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