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At least 757 records · Page 42Linked to original sources
PubMed1995

Effect of bone cylinder length on distraction osteogenesis in the rabbit tibia.

The viability and osteogenic potential of bone cylinders for bone transport was investigated in one tibia of 18 mature male New Zealand rabbits. The length of the bone cylinder was equal to or twice that of the diameter of the tibia. The cylinder was cut subperiosteally with an externally cooled oscillating saw from a lateral approach, after a specific unilateral external fixator had been applied. To simulate bone transport, one end of the cylinder was fixed to the distal bone stump by a cerclage wire and healing and revascularization was prevented by an interposed expanded polytetrafluoroethylene membrane. The periosteum was re-adapted and sutured, and distraction began 10 days postoperatively at 0.25 mm/12 hours for 22 days. New bone formation in the distraction gap was quantified by dual energy x-ray absorptiometry and by computer-assisted histomorphometry of polyfluorochrome-labeled undecalcified bone sections and corresponding microradiographs. In half of the animals with each size cylinder, osseous bridging occurred, so the findings on distraction osteogenesis are reported only for the remaining nine animals. Generally, centripetal mineralization of the gap with two distinct zones of ripening bone structures and a central radiolucent fibrocartilaginous zone could be distinguished. Neither absorptiometry nor histomorphometry showed significant differences in the overall amount of this new bone formation for the bone cylinders of two different lengths. However, osteogenesis was significantly greater at the proximal end than at the cylinder. New bone was formed predominantly from endosteal sites in the smaller cylinders and from periosteal sites in the larger cylinders. Histologically, there was complete necrosis of both sizes of cylinders, followed by revitalization through newly formed vascular channels.(ABSTRACT TRUNCATED AT 250 WORDS)

Absorptiometry, Photon↗
PubMed2000

A modular femoral implant for uncemented stem revision in THR.

We present the early results of 142 uncemented femoral stem revisions using the modular MRP-Titan system. There were 70 cases with marked preoperative femoral bone defects (Paprosky type 2C and type 3); and bone grafts were used in 31 cases. At a mean follow-up of 2.3 years five cases were re-revised due to dislocation and two due to aseptic loosening. The mean Harris hip score improved from 37.4 preoperatively to 92.4. In 122 cases progressive bone regeneration on X-ray was seen; and no further osteolysis was observed.

Adult↗
PubMed1982

What do early bone scans tell about breast cancer patients?

In 1978, 1012 out of a total of 1888 Danish breast cancer patients registered for a nationwide therapeutical trial were bone-scanned to find osseous metastases. A re-reading group (N.R., O.M. and S.P.N.) interpreted 842 of the scans produced in the twelve participating hospitals. Specific criteria were used for grading the scintiscans. Of the 842 scans 682 were performed within 30 days of the operation and were defined as initial. The re-reading group found 50 (7%) of these scans to be equivocal and 46 (7%) to be indicative of bone metastases at the time of operation. The number of X-ray-verified bone metastases was only 5 (0.6%). The frequency of positive bone scans correlated with the age of the patients and tumor size, but not with clinical staging at the time of operation, number of positive axillary lymph nodes or degree of tumor anaplasia. Recurrences and death rates during a 2-yr follow-Up period correlated significantly with initial clinical staging. In the clinical low-risk group a positive initial bone scan worsened the prognosis, but this was not statistically significant for all patients grouped together. Although the prognostic value of the initial bone scan per se is dubious, it serves as a guidance for elective X-ray examination and as a basis for comparing subsequent scans.

Age Factors↗
PubMed2000

The phase diagram of the monoolein/water system: metastability and equilibrium aspects.

Interest in the liquid crystal structure, transport and membrane protein crystallizing properties of the monoolein/water system has grown in the recent past. Monoolein is also an important homolog in a series of monoacylglycerols used to decipher how lipid molecular structure relates to liquid crystal phase behavior--information needed for rational design applications and for understanding the origin of membrane lipid diversity. To make intelligent use of the monoolein/water system, a reliable and detailed temperature-composition phase diagram is needed. The phase diagram of Briggs et al. (J Phys II France 1996;6:723-51) was constructed for this purpose. However, we have established that the liquid crystal phases in the latter below ca. 20 degrees C are metastable. By implementing a sub-zero degree (degrees C) sample incubation prior to data collection in the heating direction, we can reset the system into the lamellar crystal phase which we assume represents equilibrium behavior. We have re-examined the low-temperature part of the phase diagram and characterized structurally the new 'equilibrium' phases by static and time-resolved low- and wide-angle X-ray diffraction and by differential scanning calorimetry. A more complete phase diagram that incorporates the new equilibrium behavior at low temperatures is reported.

Calorimetry, Differential Scanning↗
PubMed1989

[The effect of UV rays on parasitic arthropods. 3. In vitro and in vivo studies of the effect of a fractionated UV irradiation on the development stages of Psoroptes cuniculi (Acaridida: Psoroptidae)].

In vitro studies were conducted into Psoroptes (Ps.) cuniculi larvae and nymphs of undefined age and gender. 30 males and females were involved in each of the experiments. Evidence was found the life expectancy of mites exposed to daily UV irradiation for 1, 2, 3, 4 or 5 minutes was reduced with significance, as compared to non-irradiated mites or to those with only one irradiation of the same length. Developmental stages of Ps. cuniculi responded in differentiated ways to the same dose rate, when applied by one single extended or fractionated shorter irradiation. Fractionated irradiation was more often survived by females than one single extended irradiation, whereas earlier death occurred to larvae following exposure to fractionated irradiation. Mange mites were not eliminated from rabbits with moderate ear mange by fractionated locally delimited in vivo irradiation, up to 16 applications of 10 minutes each or 6 or 9 applications of 10, 20 or 40 minutes each, with one-week intervals in between. Ear mange was clinically re-manifested, after irradiations had been discontinued.

Animals↗
PubMed1987

[Cardiological findings in acromegaly].

Acromegaly involves cardiovascular complications mostly due to the presence of hypertension, diabetes and atherosclerosis. However the appearance of cardiac decompensation and arrhythmias in the absence of predisposing factors tends to support the hypothesis of a specific myocardiopathy caused by excess GH. In order to assess the existence and course of subclinical cardiac alterations, 8 acromegaly patients were examined: 4 males and 4 females aged 31-56 with GH levels of 24-70 ng/ml (M + CD X 47 +/- 16) and no cardiovascular symptoms. One of the patients had moderate hypertension and 2 reduced glucose tolerance. The basal ECG showed sporadic ventricular extrasystoles in 2 cases and alterations compatible with left ventricular hypertrophy in another, while the effort ECG produced an asymptomatic depression of the ST segment in the hypertensive patient. The chest X-ray was normal in all cases. The echocardiography study investigated: the thickness of the interventricular septum (IVS = 13.9 +/- 2.8 mm), the thickness of the posterior wall of the left ventricle (LPW = 10.6 +/- 2.9 mm), the septum/posterior wall ratio (IVS/LPW = 1.3 +/- 0.2 the diastolic diameter (DD = 15.4 +/- 11.4 mm), the fraction of shortening (FS = 39.1 +/- 14.5%), the ejection fraction (EF = 64.1 +/- 18.4%) and revealed asymmetrical septal hypertrophy in 3 cases, concentric hypertrophy in another two. In two cases the DD and EF were distinctly altered. The patients were re-examined 2-4 years after surgical or radiation treatment. GH levels (M +/- SD = 10.3 +/- 10.1 ng/ml) were normal in 4 cases and still high, though lower in another two. The remaining two patients had borderline GH levels with high Sm-C. The ECG and chest X-ray were unchanged while echocardiography revealed a significant deterioration in heart function as far as DD (56.4 +/- 10.8 mm, p less than 0.05) were concerned with frankly pathological results in 4 and 3 cases respectively. These data confirm the view that most acromegalic patients present subclinical abnormalities in cardiac function and that the evolution of these is slightly influenced by the reduction in GH and Sm-C. levels. In fact, while the persistence of high GH and Sm-C. levels may explain the progression of cardiac alterations in some cases, it does not in others. It is also emphasised that echocardiography appears to be the most sensitive non-invasive technique for the diagnosis and follow-up of cardiac involvement in acromegaly.

Acromegaly↗
PubMed1989

Gamma irradiation as a substitute for H2O2 in peroxidase-labelled enzyme immunoassays.

The ability of gamma irradiation to substitute for H2O2 in peroxidase-labelled enzyme immunoassays was investigated. Colouring of TMB (3,3',5,5'-tetramethylbenzidine), ABTS [2,2'-azino-di(3-ethylbenzthiazoline-6-sulphonic acid)], and OPD (o-phenylenediamine) was produced with doses of 10 and 20 Gy. Addition of superoxide dismutase enhanced TMB and ABTS, and inhibited OPD. The reaction was terminated when the irradiation was stopped. The use of denaturing compounds to stop the reaction was unnecessary and coated antigens could be re-used for a second immunoassay.

Free Radicals↗
PubMed2003

Cochlear implant failure: imaging evaluation of the electrode course.

Cochlear implant (CI) is an electronic device used to rehabilitate patients with sensorineural hearing loss. The intent of this review is to demonstrate the normal position of the electrode on computed tomography (CT) and contrast this with various examples of the electrode malpositioning. Post-implantation CT is performed to localize the cause of implant failure in patients in which radiographs suggest an anomalous course of the electrode. A common cause of device failure is extrusion or malpositioning of the electrode. It is important for the radiologists to recognize this important aspect of device failure. Post-implant CT can help identify patients with malpositioned electrode in whom another attempt can be made by correctly re-implanting the electrode.

Cochlea↗
PubMed2003

[Advances in plant ecophysiological studies on re-vegetation of degraded ecosystem].

Natural force and human intervention lead to many local, regional, and sometimes global changes in plant community patterns. Regardless of the cause and intensity of these changes, ecosystem can recover most of their attributes through natural succession, or can be repaired by human assistance. The essentiality of restoration of degraded ecosystem is community succession, a process during which an ecosystem evolves from primary stage to advanced stage, and its structure and function change from simple to complex plant. Ecophysiological study could explain some macroscopical phenomena of the ecology of re-vegetation of degraded ecosystem, and provide a scientific base for assembling pioneering plant community. The advances in plant ecophysiological study on re-vegetation of degraded ecosystems were reviewed in this paper.

Biomass↗
PubMed2003

Redox-induced coordination isomerization of a phosphoniobenzophospholide.

1-Triphenylphosphoniobenzo[c]phospholide 1 reacts with [M(CO)(5)Br] (M = Mn, Re) and [Mn(CO)(3)(naphthalene)][BF(4)] to give complexes cis-[M(CO)(4)(1)Br] (5 a,b) and [Mn(CO)(3)(1)][BF(4)] (6 a[BF(4)]), respectively, featuring eta(1)(P)- and eta(5)(pi)-coordination of the phosphole ring. The corresponding reactions with [M(2)(CO)(10)] proceed with conservation of the metal-metal bond and yield, depending on the reaction temperature, dinuclear complexes [M(2)(CO)(8)(1)] (M=Mn, 7 a) or [M(2)(CO)(6)(1)(2)] (M=Mn, Re, 8 a,b) with mu(2)-bridging eta(1)(P):eta(2)(Pdbond;C) coordination of the phosphole moiety. All complexes formed were characterized by spectroscopic data; 5 b, 6 a[BF(4)], and 8 a,b were characterized by X-ray diffraction studies as well. The structural and (31)P NMR data of the dinuclear manganese complex 8 a suggest that the interaction between the metal atoms and the eta(2)-bound Pdbond;C double bond moieties is dominated by the L-->M charge-transfer contribution; this hints at a very low back-donation ability of the central M(2)(CO)(6) fragment. Investigation of the reactions of the Mn complexes 6 a and 8 a with Mg or ferrocenium hexafluorophosphate ([Fc][PF(6)]), respectively, revealed that the chemically reversible mutual interconversion between both species was feasible. Likewise, oxidation of the rhenium complex 8 b with [Fc][PF(6)] gave spectroscopic evidence for the formation of a Re analogue of 6 a. Electrochemical studies suggested that the oxidation 8 a-->2 6 a involves two consecutive single-electron-transfer steps, the first of which is electrochemically reversible and produces a metastable radical cation that is detectable by ESR spectroscopy. The mutual interconversion between 6 a and 8 a represents the first case of a reversible coordination isomerization of a phosphaarene that is triggered by a redox process and might stimulate further studies directed at the use of dinuclear phosphaarene complexes in redox-catalysis.

Journal Article↗
PubMed2004

Reactivity of molybdenum and rhenium hydroxo-carbonyl complexes toward organic electrophiles.

The hydroxo compounds [Re(OH)(CO)(3)(N-N)] (N-N=bipy, 2 a; Me(2)-bipy, 2 b) were prepared in a biphasic H(2)O/CH(2)Cl(2) medium by reaction of [Re(OTf)(CO)(3)(N-N)] with KOH. In contrast, when anhydrous CH(2)Cl(2) was used, the binuclear hydroxo-bridged compound [[Re(CO)(3)(bipy)](2)(mu-OH)]OTf (3-OTf) was obtained. Compound [Re(OH)(CO)(3)(Me(2)-bipy)] (2 b) reacted with phenyl acetate or vinyl acetate to afford [Re(OAc)(CO)(3)(Me(2)-bipy)] (4) and phenol or acetaldehyde, respectively. The reactions of [Mo(OH)(eta(3)-C(3)H(4)-Me-2)(CO)(2)(phen)] (1), 2 a, and 2 b toward several unsaturated organic electrophiles were studied. The reaction of 1 with (p-tolyl)isocyanate afforded an adduct of N,N'-di(p-tolyl)urea and the carbonato-bridged compound [[Mo(eta(3)-C(3)H(4)-Me-2)(CO)(2)(phen)](2)(mu-eta(1)(O),eta(1)(O)-CO(3))] (5). In contrast, the reaction of 2 a with phenylisocyanate afforded [Re(OC(O)NHPh)(CO)(3)(bipy)] (6); this results from formal PhNCO insertion into the O-H bond. On the other hand, compounds [Mo[SC(O)NH(p-tolyl)](eta(3)-C(3)H(4)-Me-2)(CO)(2)(phen)] (7), [Re[SC(O)NH(p-tolyl)](CO)(3)(Me(2)-bipy)] (8 a), and [Re[SC(O)NHEt](CO)(3)(Me(2)-bipy)] (8 b) were obtained by reaction of 1 or 2 b with the corresponding alkyl or aryl isothiocyanates. In those cases, RNCS was inserted into the M-O bond. The reactions of 1, 2 a, and 2 b with dimethylacetylenedicarboxylate (DMAD) gave the complexes [Mo[C(OH)-C(CO(2)Me)C(CO(2)Me)-O](eta(3)-C(3)H(4)-Me-2)(CO)(phen)] (9) and [Re[C(OH)C(CO(2)Me)C(CO(2)Me)O](CO)(2)(N-N)] (N-N=bipy, 10 a; Me(2)-bipy, 10 b). The molecules of these compounds contain five-membered metallacycles that are the result of coupling between the hydroxo ligand, DMAD, and one of the CO ligands. The new compounds were characterized by a combination of IR and NMR spectroscopy, and for [[Re(CO)(3)(bipy)(2)(mu-OH)]BF(4) (3-BF(4)), 4, 5, 6, 7, 8 b, 9, and 10 b, also by means of single-crystal X-ray diffraction.

Models, Chemical↗
PubMed1993

Structural studies on the conformations of myosin.

Myosin is the major motor protein found in vertebrate striated and smooth muscle and in non-muscle cells where, in association with actin, its main role is to convert chemical energy into mechanical work. Smooth muscle and non-muscle myosin adopts a number of different conformations: for example an unfolded (6S) form which is capable of forming filaments and generating force and a 'folded' (10S) form, which is most probably a storage form incapable of forming filaments. In the 10S form the products of ATP cleavage are trapped by the folded tails and the ATPase activity of myosin is greatly reduced. It is believed that a transition to the unfolded 6S form is necessary prior to filament formation. We report here on two relatively low resolution structural techniques for studying hydrated myosin. We have used a relatively recent development in microscopy, the scanning tunneling microscope, to image a series of biologically interesting specimen, mainly to evaluate the potential of the technique. There are significant potential advantages for imaging biological specimen with the STM as the imaging is done in air and the specimen can be imaged without a metal coating. Our experience with imaging myosin suggests that good images of hydrated myosin can be obtained but with poor reproducibility. We have also carried out small angle solution x-ray scattering studies on the two myosin conformations to explore the possibilities of doing kinetic measurements on the transition between the two states. Small angle scattering from the S1 fragment are re-constituted parts of the rod have also been carried out and the data is compared with expected scattering from model structures.

Animals↗
PubMed2006

Persistence of host response against glochidia larvae in Micropterus salmoides.

Host fish acquire resistance to the parasitic larvae (glochidia) of freshwater mussels (Unionidae). Glochidia metamorphose into juvenile mussels while encysted on host fish. We investigated the duration of acquired resistance of largemouth bass, Micropterus salmoides (Lacepède, 1802) to glochidia of the broken rays mussel, Lampsilis reeveiana (Call, 1887). Fish received three successive priming infections with glochidia to induce an immune response. Primed fish were held at 22-23 degrees C and were challenged (re-infected) at intervals after priming. Metamorphosis success was quantified as the percent of attached glochidia that metamorphosed to the juvenile stage and were recovered alive. Metamorphosis success at 3, 7, and 12 months after priming was significantly lower on primed fish (26%, 40%, and 68% respectively) than on control fish (85%, 93%, and 92% respectively). A second group of largemouth bass was similarly primed and blood was extracted. Immunoblotting was used to detect host serum antibodies to L. reeveiana glochidia proteins. Serum antibodies were evident in primed fish, but not in naive control fish. Acquired resistance of host fish potentially affects natural reproduction and artificial propagation of unionids, many of which are of conservation concern.

Age Factors↗
PubMed2005

Diagnosis and management of tuberculosis by private practitioners in Manila, Philippines.

SETTING: Private for-profit health care providers are prominent in the health system of the Philippines. OBJECTIVES: To examine the practices of the private practitioners in Malabon, Metropolitan Manila, Philippines, concerning diagnosis and treatment of tuberculosis (TB). DESIGN: Forty-five private practitioners of Malabon who treat adult TB patients were interviewed. RESULTS: For diagnosis, most private practitioners relied on the clinical presentation and result of an X-ray. Only 13% of the respondents routinely also asked for sputum examination. Ninety-six percent used X-ray as a tool to monitor treatment. Sixty percent of the respondents prescribed a regimen consisting of isoniazid, rifampicin, pyrazinamide, and ethambutol. Except for rifampicin, over-dosage was common. For re-treatment cases, none prescribed the WHO-recommended re-treatment regimen. The private practitioners perceived the main reasons for patient non-adherence to be the patients' lack of finances to buy drugs and patients' perceived well being after a certain period of treatment. Patients' lack of money was seen as the main obstacle to compliance. The only case holding mechanism mentioned was occasional clinic appointments of the TB patients. CONCLUSION: Private practices for diagnosis and treatment of TB typically deviate from guidelines. The quality of care among private practitioners needs improvement. Innovative strategies are required.

Adult↗