GEOGRAPHICAL REVIEW, Issue 2 2003
GREIG TOR GUTHEY
ABSTRACT. Farmers in Marin and Sonoma Counties, located north of San Francisco, are experimenting with numerous alternatives to California's widely known industrial dairy style. Many analysts suggest that consumer politics, food scares, and globalization explain such shifts to organic and other types of "quality" food production. While acknowledging the importance of these factors, we argue that the alternatives in this region are best understood as an outcome of broad-based land-conservation efforts developed through historical and ongoing struggles over urban growth, rising concerns about environmental values, and deep regional interests in dairy preservation. Over time, preservation of this agricultural landscape has contributed to the emergence of a quality food industry historically rooted in the region's politics of place. [source]

PRESERVATION OF COMMERCIAL FISH BALL QUALITY WITH EDIBLE ANTIOXIDANT-INCORPORATED ZEIN COATINGS

JOURNAL OF FOOD PROCESSING AND PRESERVATION, Issue 5 2009
LIAN-SYUN LIN
ABSTRACT Fish ball, a surimi product rich in lipid and protein, is a popular food in Taiwan. Because lipid oxidation is one of the major deterioration reactions for fish ball, the feasibility of preservation of fish ball quality by the application of antioxidant-incorporated zein coating was investigated. Three antioxidants including butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and n-propyl gallate (PG) were used to formulate the antioxidant zein coatings. Infrared spectroscopy was used to confirm the successful incorporation of antioxidant with zein protein; peroxide value (POV), thiobarbituric acid reactive substance (TBARS) and weight loss were used as the quality indicators of fish ball stored at 4C. While all three types of antioxidant-incorporated zein coatings significantly retarded the quality deterioration, PG-incorporated zein coating exerted better quality preservation effectiveness than BHA- and BHT-incorporated zein coatings. PRACTICAL APPLICATIONS Edible coatings have been under research for several decades. However, most of the studies are conducted for the investigations of physiochemical or mechanical properties and usually using simulated food systems. The lack of applications on the commercial food products manufactured from food plants makes the edible coatings somewhat unrealistic. Not prepared in a laboratory for academic purpose only, the fish ball used in the present study was a real commercial product. The promising results of antioxidant-incorporated zein coatings on commercial products presented in this report will enhance the confidence of food manufacturers on the edible coatings. [source]

PRESERVATION OF "UMBU" (SPONDIAS TUBEROSA ARRUDA CÂMARA) PULP IN THE GREEN STAGE OF MATURATION BY COMBINED METHODS

JOURNAL OF FOOD PROCESSING AND PRESERVATION, Issue 3 2007
ELIDA CONCEIÇÃO JORGE
ABSTRACT "Umbu" (Spondias tuberosa Arruda Câmara) is a typical fruit from northeastern Brazil of considerable economic importance to this region, because several products are derived from it and commercialized, especially the pulp, which can be used as a raw material for preserves and juices. The objective of this research was to study the preservation of umbu in the green stage of maturation by combined methods, including heat treatment and the addition of preservatives and sucrose. The pulps were blanched, pasteurized and mixed with the preservatives and sucrose according to a complete factorial design with three variables (ratio pulp/sucrose, potassium sorbate and sodium metabisulfite), two levels and two repetitions. The products were filled into high-density polyethylene packages and exposed to a temperature of 40C for 120 days. Physicochemical, color and chemical (SO2) analyses showed that the concentrations of sodium metabisulfite and potassium sorbate used did not significantly alter product quality. The addition of sucrose significantly decreased the water activity and led to intense browning. The microbiological evaluations showed good product stability for 120 days. The overall results indicated that the heat treatment applied was effective if high levels of hygiene were maintained during the preparatory stages and the packaging materials were well sanitized. The combined preservation methods appear to be an economic way to preserve these high-acid pulps. [source]

EFFECT OF METHOD OF PRESERVATION OF PULP ON THE QUALITY OF CARBONATED AND NONCARBONATED BEVERAGES PREPARED FROM PEACH FRUIT

JOURNAL OF FOOD QUALITY, Issue 6 2009
SHEETU ARORA
ABSTRACT Peach pulp preserved by different methods, i.e., processing at 100C for 30 min, potassium metabisulphite (KMS; 2,000 ppm), sodium benzoate (750 ppm) and mixture of KMS and sodium benzoate (1,000 and 375 ppm) had no significant effect on total soluble solids (TSS), acidity, TSS : acid ratio, pH of carbonated as well as noncarbonated beverages. Carbonated beverages prepared from pulp with 750 ppm of sodium benzoate retained significantly (P , 0.05) higher carbon dioxide (CO2) content and CO2 gas : volume during storage. Color of the beverages prepared from peach pulp containing KMS was better but the beverages prepared from peach pulp preserved by processing and addition of sodium benzoate were organoleptically more acceptable. Both carbonated and noncarbonated drinks remained organoleptically acceptable throughout storage. Suspension of carbonated beverages was significantly (P , 0.05) higher during storage as compared with noncarbonated beverages. PRACTICAL APPLICATIONS Peaches are valued as a table fruit for a short period of time from end of April to end of May. The acceptability and utilization of this fruit can be increased by processing it into delicious carbonated and noncarbonated beverages. This will provide nutritious drink to the consumers and also help in increasing the fruit cultivation resulting in good returns to the growers. This study will also help to give a fillip to the establishment of a peach beverage industry world wide. [source]

EFFECT OF PROCESSING, PRESERVATION AND STORAGE ON RHEOLOGY OF GUAVA PULP

JOURNAL OF TEXTURE STUDIES, Issue 4 2001
S. W. HARNANAN
ABSTRACT Rheological behavior of white and pink guava pulps was investigated using Rheotest 2 coaxial cylinder viscometer over shear rates of 0.6 to 145.8 s,1. The shear rate-shear stress data followed the power law, Casson, Herschel-Bulkley, Michaels and Bolger models. The power law flow behavior index values were in the range of 0.14 to 0.19. Presence of measurable yield stress indicated Bingham model of the pulps. Storage of pulps for 30 weeks had negligible influence on flow behavior index values. The consistency index and yield stress values decreased with extending storage from 0 to 30 weeks. The Michaels and Bolger model distinctly described the non-Newtonian nature of cold- and hot-break pulps as well as different behavior of the pink guava pulps. The structure shear resistance values for hot-break pulps at zero shear rate were considerably higher than those of the cold-break, indicating their high pseudoplasticity. [source]

IDEOLOGICAL DEVELOPERS AND THE FORMATION OF LOCAL DEVELOPMENT POLICY: THE CASE OF INNER-CITY PRESERVATION IN TEL AVIV

JOURNAL OF URBAN AFFAIRS, Issue 5 2008
NURIT ALFASI
ABSTRACT:,This article studies the role of ideological developers (IDs) in the formation and implementation of local development policy. The IDs are developers whose motivation is ideological as opposed to financial, and they initiate ideas rather than plans and projects. Based on a case study regarding inner-city preservation, we claim that in Tel Aviv, IDs have much leverage on local decision making. The IDs are individuals with high personal capital, who focus on an issue that it is not championed by existing civil groups. As the IDs seek out influential routes to policy makers, they build circumstantial coalitions. Through these limited and conditional partnerships with administrators and other influential actors, the IDs apply pressure and advance their specific cause. [source]

SOFT-TISSUE PRESERVATION OF THE HIND GUT IN A NEW GENUS OF CLADID CRINOID FROM THE MISSISSIPPIAN (VISEAN, ASBIAN) AT ST ANDREWS, SCOTLAND

PALAEONTOLOGY, Issue 4 2007
THOMAS W. KAMMER
Abstract:, Soft-tissue preservation of the hind gut, or anal sac, in the tegmen of Tubulusocrinus (gen. nov.) doliolus (Wright) from the Mississippian (Visean, Asbian) Pittenweem Formation at St Andrews, Scotland, is the first of its kind known in crinoids; it sheds important new light on the nature of the cladid tegmen. Many cladid crinoids had a calcite-plated anal sac that may have functioned like a chimney to prevent fouling of the ambulacra. The tubular, uncalcified anal sac of Tubulusocrinus may have functioned like a hose by pointing down current between the arms to avoid fouling of the ambulacra. Its smaller size may also have required less energy to produce than a heavy-plated sac. The hind gut is apparently preserved by haematite replacement, which was probably altered from original authigenic pyrite that formed soon after catastrophic burial. [source]

CARBONATE DEPOSITIONAL ENVIRONMENTS, SEQUENCE STRATIGRAPHY AND EXCEPTIONAL SKELETAL PRESERVATION IN THE MUCH WENLOCK LIMESTONE FORMATION (SILURIAN) OF DUDLEY, ENGLAND

PALAEONTOLOGY, Issue 1 2007
DAVID C. RAY
Abstract:, The Much Wenlock Limestone Formation of the Dudley inliers, West Midlands, contains one of the world's richest and most exquisitely preserved Silurian marine biotas. However, for most museum specimens, little is known of their exact provenance and mode of preservation. Detailed comparisons between outcrops and museum collections allow the identification of five faunal-lithological associations and numerous horizons of exceptional skeletal preservation. The associations are interpreted as a series of transient carbonate mid-platform environments extending from below storm wave-base to above fair-weather wave-base. Erosive surfaces, condensed sections, flooding surfaces and the stacking patterns of genetically related bed-sets (parasequences) have allowed the formation to be interpreted as a single third-order sequence stratigraphic cycle of sea-level change. The articulated preservation of taxa such as pelmatozoan echinoderms and trilobites can be attributed to either rapid burial by obrution deposits close to fair-weather wave-base or smothering by storm sequestered muds in slightly deeper-water settings. Such intervals of exceptional preservation are commonly associated with flooding surfaces, presumably reflecting reduced likelihood of reworking once rapid burial had taken place. [source]

AN EXCEPTIONALLY PRESERVED ANTLION (INSECTA, NEUROPTERA) WITH COLOUR PATTERN PRESERVATION FROM THE CRETACEOUS OF BRAZIL

PALAEONTOLOGY, Issue 6 2005
SAM W. HEADS
Abstract:, A new species of palaeoleontid neuropteran Baisopardus cryptohymen sp. nov. is described. The holotype is remarkable for the preservation of fine body structures and colour patterning on all of its four wings. The specimen is nearly complete, lacking only the abdomen and the right mesothoracic leg, and is preserved as a black-brown compression in laminated limestone of the Nova Olinda Member, Crato Formation (late Aptian, Early Cretaceous), Ceará, Brazil. The colour pattern of the forewings comprises a series of dark brown bands that overlap with colourless bands of the hindwings; it produced a cryptic colour pattern when the wings were folded. [source]

3. THE ESTABLISHMENT OF THE ROYAL COMMISSION FOR THE PRESERVATION OF ANTIQUITIES

ACTA ARCHAEOLOGICA, Issue 1 2007
Article first published online: 16 MAY 200
No abstract is available for this article. [source]

SENSATION RECOVERY IMPROVED BY GREAT AURICULAR NERVE PRESERVATION IN PAROTIDECTOMY: A PROSPECTIVE DOUBLE-BLIND STUDY

ANZ JOURNAL OF SURGERY, Issue 5 2007
Dacita T. K. Suen
Background: The great auricular nerve (GAN) is frequently sacrificed during parotidectomy and causes sensory disturbance of the auricle. Our study is to investigate whether GAN preservation can improve the sensory recovery. Methods: Patients undergoing superficial or total conservative parotidectomy for benign tumours were recruited consecutively from November 1998 to September 2001. Different sensory methods (light touch, two-point discrimination and sharp pain) of the auricle were evaluated by a designated physiotherapist preoperatively as well as at 1, 3, 6 and 12 months postoperatively. The patients and the physiotherapist were blinded to the integrity of the GAN. Long-term subjective assessment was also carried out beyond 2 years postoperatively. Results: A total of 21 patients were recruited for the study. GAN were preserved in 10 patients. The mean follow up was 16 months (12,42 months). There was no difference in sex distribution, type of operation and pathology of parotid tumour between the two groups. No postoperative mortality occurred and postoperative morbidity did not differ between the two groups. Patients with GAN preserved had significantly better light touch and sharp pain recovery at 1 year postoperatively. Subjective assessment of sensory dysfunction also favoured GAN preservation. Conclusion: Great auricular nerve preservation minimizes the postoperative sensory disturbance and should be considered whenever tumour clearance is not compromised. [source]

Mechanical removal of necrotic periodontal ligament by either Robinson bristle brush with pumice or scalpel blade.

DENTAL TRAUMATOLOGY, Issue 6 2007
Histomorphometric analysis, scanning electron microscopy
Abstract,,, One of the important factors accounting for successful delayed replantation of avulsed teeth is seemingly the type of root surface treatment. Removal of necrotic cemental periodontal ligament remnants may prevent the occurrence of external root resorption, which is the major cause of loss of teeth replanted in such conditions. The purpose of this study was to compare the efficacy of two mechanical techniques for removal of root-adhered periodontal ligament. Preservation or removal of the cementum layer concomitantly with these procedures was also assessed. Forty-five roots of healthy premolars extracted for orthodontic purposes were selected. After extraction, the teeth were kept dry at room temperature for 1 h and then immersed in saline for rehydration for an additional 10 min. Thereafter, the roots were assigned to three groups, as follows: group 1 (control) - the cemental periodontal ligament was preserved; group 2 - removal of the periodontal ligament by scraping root surface with a scalpel blade (SBS); group 3 - periodontal ligament remnants were removed using a Robinson bristle brush at low-speed with pumice/water slurry (RBP). The specimens were analysed histomorphometrically and examined by scanning electron microscopy. The quantitative and qualitative analyses of the results showed that the RBP technique was significantly more effective than the SBS technique for removal of the periodontal ligament remnants adhered to root surface. Both techniques preserved the cementum layer. [source]

Single-tooth implant treatment in the anterior region of the maxilla for treatment of tooth loss after trauma: a retrospective clinical and interview study

DENTAL TRAUMATOLOGY, Issue 3 2003
Lars Andersson
Abstract,,, The aim of this study was to evaluate the results of single-tooth implant treatment in patients where teeth have been lost as a result of trauma. Also, the patients' and professionals' opinions regarding the final outcome of treatment were assessed. Thirty-four patients with 42 lost teeth were evaluated by clinical and radiographic examinations and interviews 2,5 years after treatment. A professional who had not taken part in the treatment evaluated the implant crowns. Central maxillary incisors were the most frequently lost and replaced teeth after trauma (75%) followed by lateral incisors (21%). In patients with incomplete growth, implant treatment was generally postponed until completion of growth. Lack of space was treated by presurgical orthodontics (7%) or by selecting an implant with a reduced diameter (5%). Deficiency of bone was seen in 17% and was treated by bone grafting or local augmentation prior to implant surgery. Patients who had lost two or more teeth after trauma were all subjected to bone grafting. Preservation of roots in the alveolar process seemed to maintain the bone volume enabling better conditions for later implant placement. Forty-one implants (97.6%) were integrated successfully. Complications were few and of minor importance (9.5% before and 12% after cementation of crowns) and could all be managed. No or minimal bone loss was seen. In general, the patients felt that they received good care and that they were well informed about their treatment. Some patients reported that the local anesthesia procedure was not pain-free, but 71% of the patients experienced the treatment as pain-free. For each of the variables (color, shape, height, and size of the crowns), the highest degree of satisfaction was noted in 93,98% of the patients and 91,95% of the single evaluating professional. Given that the patients have finished growth and a careful treatment planning and timing are performed, the functional and esthetical outcome of single-tooth implant treatment today is excellent and can be recommended for replacing tooth losses after trauma in the anterior region of the maxilla. [source]

Preservation of sight in diabetes: developing a national risk reduction programme

DIABETIC MEDICINE, Issue 9 2000
L. Garvican
SUMMARY Background Early treatment for diabetic retinopathy is effective at saving sight, but dependent on pre-symptomatic detection. Although 60% of people with diabetes have their eyes examined annually, few UK health authorities have systematic programmes that meet the British Diabetic Association's standards for sensitivity (> 80%) and specificity (> 95%). Screening is generally performed by general practitioners and optometrists, with some camera-based schemes, operated by dedicated staff. The National Screening Committee commissioned a group to develop a model and cost estimates for a comprehensive national risk-reduction programme. Ophthalmoscopy Evidence indicates that direct ophthalmoscopy using a hand-held ophthalmoscope does not give adequate specificity and sensitivity, and should be abandoned as a systematic screening technique. Indirect ophthalmoscopy using a slit lamp is sensitive and specific enough to be viable, and widespread availability in high street optometrists is an advantage, but the method requires considerable skill. Photographic schemes The principal advantage of camera-based screening is the capturing of an image, for patient education, review of disease progression, and quality assurance. Digital cameras are becoming cheaper, and are now the preferred option. The image is satisfactory for screening and may be transmitted electronically. With appropriate training and equipment, different professional groups might participate in programme delivery, based on local decisions. Cost issues Considerable resources are already invested in ad hoc screening, with inevitable high referral rates incurring heavy outpatient costs. Treatment for advanced disease is expensive, but less likely to be effective. The costs of a new systematic screening and treatment programme appear similar to current expenditure, as a result of savings in treatment of late-presenting advanced retinopathy. Conclusion A systematic national programme based on digital photography is proposed. [source]

First record of the brachiopod Lingulella waptaensis with pedicle from the Middle Cambrian Burgess Shale

ACTA ZOOLOGICA, Issue 2 2010
Sandra Pettersson Stolk
Abstract Pettersson Stolk, S., Holmer, L. E. and Caron, J -B. 2010. First record of the brachiopod Lingulella waptaensis with pedicle from the Middle Cambrian Burgess Shale. ,Acta Zoologica (Stockholm) 91: 150,162 The organophosphatic shells of linguloid brachiopods are a common component of normal Cambrian,Ordovician shelly assemblages. Preservation of linguloid soft-part anatomy, however, is extremely rare, and restricted to a few species in Lower Cambrian Konservat Lagerstätten. Such remarkable occurrences provide unique insights into the biology and ecology of early linguloids that are not available from the study of shells alone. Based on its shells, Lingulella waptaensis Walcott, was originally described in 1924 from the Middle Cambrian Burgess Shale but despite the widespread occurrence of soft-part preservation associated with fossils from the same levels, no preserved soft parts have been reported. Lingulella waptaensis is restudied herein based on 396 specimens collected by Royal Ontario Museum field parties from the Greater Phyllopod Bed (Walcott Quarry Shale Member, British Columbia). The new specimens, including three with exceptional preservation of the pedicle, were collected in situ in discrete obrution beds. Census counts show that L. waptaensis is rare but recurrent in the Greater Phyllopod Bed, suggesting that this species might have been generalist. The wrinkled pedicle protruded posteriorly between the valves, was composed of a central coelomic space, and was slender and flexible enough to be tightly folded, suggesting a thin chitinous cuticle and underlying muscular layers. The nearly circular shell and the long, slender and highly flexible pedicle suggest that L. waptaensis lived epifaunally, probably attached to the substrate. Vertical cross-sections of the shells show that L. waptaensis possessed a virgose secondary layer, which has previously only been known from Devonian to Recent members of the Family Lingulidae. [source]

Characterization of Neuronal Migration Disorders in Neocortical Structures: Loss or Preservation of Inhibitory Interneurons?

EPILEPSIA, Issue 7 2000
Petra Schwarz
Summary: Purpose: Neuronal migration disorders (NMD) are often associated with therapy-resistant epilepsy. In human cerebral cortex, this hyperexcitability has been correlated with a loss of inhibitory interneurons. We used a rat model of focal cortical NMD (microgyria) to determine whether the expression of epileptiform activity in this model coincides with a decrease in inhibitory interneurons. Methods: In 2- to 4-month-old rats, the density of interneurons immunoreactive for ,-aminobutyric acid (GABA), cal-bindin, and parvalbumin was determined in fronto-parietal cortex in nine 200-,m-wide sectors located up to 2.5 mm lateral and 2.0 mm medial from the lesion center in primary parietal cortex (Par 1). Quantitative measurements in homotopic areas of age-matched sham-operated rats served as controls. Results: The freeze lesion performed in newborn rat cortex resulted in adult rats with a microgyrus extending in a rostro-caudal direction from frontal to occipital cortex. The density of GABA- and parvalbumin-positive neurons in fronto-parietal cortex was not significantly different between lesioned and control animals. Only the density of calbindin-immunoreactive neurons located 1.0 mm lateral and 0.5 mm medial from the lesion was significantly (Student t test, p > 0.05) larger in freeze-lesioned rats (5.817 ± 562 and 6,400 ± 795 cells per mm3, respectively; n = 12) compared with measurements in homotopic regions in Parl cortex of controls (4,507 ± 281 and 4,061 ± 319 cells per mm3, respectively; n = 5). Conclusions: The previously reported widespread functional changes in this model of cortical NMD are not related to a general loss of inhibitory interneurons. Other factors, such as a decrease in GABA receptor density, modifications in GABAA receptor subunit composition, or alterations in the excitatory network, e.g., an increase in the density of calbindin-immunoreactive pyramidal cells, more likely contribute to the global disinhibition and widespread expression of pathophysiological activity in this model of cortical NMD. [source]

NMR Study of L-Shaped (Quinoxaline)platinum(II) Complexes , Crystal Structure of [Pt(DMeDPQ)(bipy)](PF6)2

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 23 2004
Enrico Rotondo
Abstract A 1H and 13C NMR study of nine PtII complexes of DMeDPQ [6,7-dimethyl-2,3-bis(2-pyridyl)quinoxaline] and BDPQ [2,3-bis(2-pyridyl)benzo[g]quinoxaline], and the crystal structure of one of them, are reported. The results are consistent with Cs symmetry of "L-shaped square-planar complexes". The rigid seven-membered chelated quinoxaline ligand holds the fused aromatic rings nearly perpendicular to the PtII coordination plane, generating the peculiar L-shaped structure. Ancillary ligands in the residual coordination sites are: a) bidentate flexible-planar 2,2,-bipyridine (bipy; complexes 1 and 2); b) bidentate rigid-planar dipyrido[3,2- a:2,3,- c]phenazine (dppz) or benzo[b]dipyrido[3,2- h:2,,3,- j]phenazine (bdppz; complexes 3,6); or c) 3-substituted monodentate pyridines (3-Rpy; complexes 7,9). The L-shaped geometry has been exploited to gain insight into the steric and dynamic features that regulate the noncovalent interactions of these square-planar complexes with DNA. We have shown previously, for [Pt(bipy)(n -Rpy)2]2+, that bipy twisting can be frozen out on the NMR timescale below 260 K. Preservation of the Cs symmetry at low temperature indicates a lack of bipy fluxionality within these L-shaped structures. The static butterfly-like symmetric orientation of the quinoxaline pyridyl rings accounts for the hampered twisting of Pt(bipy), which is otherwise assisted by the synchronous "windscreen wiper" conrotatory rocking of the ancillary pyridine rings. The L-geometry can also be used to monitor the ancillary n -Rpy rotation by NMR spectroscopy. The quasi-vertical quinoxaline pyridyl rings alignment leave room in the coordination plane for the crossing of the opposite pyridine rings, thereby reducing their rotational barriers about the Pt,N bond. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004) [source]

Habitat-mediated size selection in endangered Atlantic salmon fry: selectional restoration assessment

EVOLUTIONARY APPLICATIONS (ELECTRONIC), Issue 4 2010
Michael M. Bailey
Abstract Preservation of adaptive variation is a top priority of many species restoration programs, but most restoration activities are conducted without direct knowledge of selection that might foster or impair adaptation and restoration goals. In this study, we quantified geographic variation in selection on fry size of endangered Atlantic salmon (Salmo salar) during the 6-week period immediately following stocking in the wild. We also used a model selection approach to assess whether habitat variables influence patterns of such selection. We found evidence for significant size-selection in five out of six selection trials. Interestingly, the strength and pattern of selection varied extensively among sites, and model selection suggested that this variation in phenotypic selection was related to geographic variation in the presence of large woody debris and the slope of the stream gradient. The strong selection differentials we observed should be a concern for endangered salmon restoration, whether they reflect natural processes and an opportunity to maintain adaptation, or an indicator of the potentially deleterious phenotypic consequences of hatchery practices. [source]

Microtubules in basalt glass from Hawaii Scientific Driling Project #2 phase 1 core and Hilina slope, Hawaii: evidence of the occurrence and behavior of endolithic microorganisms

GEOBIOLOGY, Issue 4 2008
A. W WALTON
ABSTRACT Elongate, fine tubes, ~1 µm wide and up to 200 µm long, extend from fractured surfaces, vesicle walls, and internal fractures into fragments of basalt glass in samples from the Hawaii Scientific Drilling Project #2 phase 1 (HSDP #21) core and the Hilina slope, Hawaii. Several features indicate that these tubes are microbial endolithic microborings: the tubes resemble many described microborings from oceanic basalt glass, their formation is postdepositional but restricted to certain but different ranges of time in the two sets of samples, and they are not uniformly distributed throughout glass fragments. Microtubules record several characteristic behaviors including boring into glass, mining, seeking olivine, and avoiding plagioclase. They also are highly associated with a particular form of glass-replacing smectite. Evidence of behavior should join morphological and geochemical criteria in indicating microbial alteration of basalt glass. In some samples, steeply conical tubes, ~10,20 µm in diameter tapering to 1 µm and commonly filled with smectite, appear to be modifications or elaborations of the microtubules. These also curve toward olivine and are associated with replacement smectite. In HSDP #21 samples, microtubules initiated at margins of shards before palagonite replaced those margins and are preserved during palagonitization. In fact, microtubules appear to have provided routes that enhanced the efficiency of water's reaching of unaltered glass. In Hilina Slope samples, the microtubules appear to postdate palagonitization because they initiate at the boundary between palagonite and unaltered sideromelane. Preservation of microtubules during palagonitization in samples together with recognition of other associated characteristics representing behavior suggests that such features may be recognizable in more heavily altered ancient rocks. [source]

Recharge and Preservation of Laurentide Glacial Melt Water in the Canadian Shield

GROUND WATER, Issue 5 2000
Ian D. Clark
Ground water inflows to drifts ranging from 700 to 1615 m below ground surface at the Con Mine, Yellowknife, Northwest Territories, Canada, were used to study deep hydrogeological flow regimes in Shield terrain. Salinity trends are due to mixing between low-TDS ground water and deep Ca(Na)-C1 brines (>290 g/L) likely derived from Devonian sea water. C1 - ,,18O relationships demonstrate that all inflows are a mixture of three distinct components: modern meteoric ground water (,18O ,,18.9 ± 0.1%o), brine (,18O ,,10%o), and an isotopically depleted water (,18O ,,28%o). The origin of this third endmember is attributed to glacial melt water injected into the subsurface during ablation of the Laurentide Ice Sheet at ca. 10 ka. A mechanism is proposed where high hydrostatic pressure in the ablation zone imposes strong downward gradients beneath the ice sheet margin. Numerical simulation with the SWIFT II finite-difference code recreates the observed salinity gradients within a modeled 50-year interval, corresponding with the rate of retreat of the ice sheet across the landscape at this time. The persistence of this melt water in the subsurface for some 10,000 years following retreat of the ice and decay of the steep hydraulic gradients highlights the importance of gradient, in addition to permeability, as a major control on ground water flow and transport in deep crystalline settings. [source]

Fracture of the pancreas in two patients after a go-kart accident

HPB, Issue 1 2001
M J Govaert
Background After blunt abdominal trauma, an isolated injury to the pancreatic duct is uncommon. Physical signs and laboratory parameters are often inaccurate, and missing this diagnosis can cause serious clinical problems. Case outlines Two young women (aged 18 and 20 years) are reported who sustained isolated trauma to the pancreatic duct in go-kart accidents. Each patient sustained a fracture of the pancreas. This injury was diagnosed only after a period of clinical observation with repeated laboratory parameters, ultrasound and CT scan. Pancreatic tissue was conserved by performing a pancreaticojejunostomy. Discussion After any episode of blunt abdominal trauma, isolated injury to the pancreatic duct should be considered. Serum analysis, ultrasonography and CT scanning can be helpful in early diagnosis. Preservation of pancreatic tissue can be achieved with a good clinical outcome. [source]

Preservation of a transgenic strain of the sawfly, Athalia rosae (Hymenoptera) by artificial fertilization using cryopreserved sperm

INSECT MOLECULAR BIOLOGY, Issue 1 2005
M. Hatakeyama
Abstract Germline transformation using a piggyBac -derived vector is feasible in the sawfly, Athalia rosae. A previously generated transgenic line carrying green fluorescence protein (GFP) genes as reporters was successfully maintained and preserved without consecutive rearing. Sperm taken from males that were frozen directly in liquid nitrogen and stored at ,80 °C for a year were microinjected into mature unfertilized eggs dissected from female ovaries. A fraction of the sperm-injected eggs was fertilized and developed into diploid females, and all of them expressed GFP. Haploid male progeny from these females segregated into GFP-positive and GFP-negative individuals in a ratio of 1 : 1 indicating heterozygosity of the parental females. The GFP genes were stably inherited staying at the location where they were originally integrated. [source]

High-order stable interpolations for immersed boundary methods

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, Issue 11 2006
Nikolaus Peller
Abstract The analysis and improvement of an immersed boundary method (IBM) for simulating turbulent flows over complex geometries are presented. Direct forcing is employed. It consists in interpolating boundary conditions from the solid body to the Cartesian mesh on which the computation is performed. Lagrange and least squares high-order interpolations are considered. The direct forcing IBM is implemented in an incompressible finite volume Navier,Stokes solver for direct numerical simulations (DNS) and large eddy simulations (LES) on staggered grids. An algorithm to identify the body and construct the interpolation schemes for arbitrarily complex geometries consisting of triangular elements is presented. A matrix stability analysis of both interpolation schemes demonstrates the superiority of least squares interpolation over Lagrange interpolation in terms of stability. Preservation of time and space accuracy of the original solver is proven with the laminar two-dimensional Taylor,Couette flow. Finally, practicability of the method for simulating complex flows is demonstrated with the computation of the fully turbulent three-dimensional flow in an air-conditioning exhaust pipe. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Residual rickets or osteomalacia: a case dating from the 16,18th centuries from Krosno Odrza,skie, Poland

INTERNATIONAL JOURNAL OF OSTEOARCHAEOLOGY, Issue 5 2009
E. Haduch
Abstract A skeleton from a 16,18th century burial site in Krosno Odrza,skie, Poland, was examined using classical morphological, metric and macroscopic palaeopathological observations, as well as radiography and tomography of the skull and long bones. A wide variety of the observed bone deformations probably occurred as a consequence of past rickets and/or osteomalacia, whose primary cause may also have been chronic renal failure. Preservation of the bones enables a discussion of the cause of such pathological changes. The subject under study appears to be a very interesting example of an individual whose skeleton shows advanced pathological alterations associated with the subject's vitamin D deficiency, overall health conditions and relatively long lifespan. Copyright © 2008 John Wiley & Sons, Ltd. [source]

Irreversible Perforations in Vertebral Trabeculae?,

JOURNAL OF BONE AND MINERAL RESEARCH, Issue 7 2003
X Banse
In human cancellous bone, osteoclastic perforations resulting from normal remodeling were generally considered irreversible. In human vertebral samples, examined by backscatter electron microscopy, there was clear evidence of bridging of perforation defects by new bone formation. Hence trabecular perforations may not be irreversible. Introduction: Preservation of the trabecular bone microarchitecture is essential to maintain its load-bearing capacity and prevent fractures. However, during bone remodeling, the osteoclasts may perforate the platelike trabeculae and disconnect the structure. Large perforations (>100 ,m) are generally considered irreversible because there is no surface on which new bone can be laid down. In this work, we investigated the outcome of these perforations on human vertebral cancellous bone. Materials and Methods: Using backscatter electron microscopy, we analyzed 264 vertebral bone samples from the thoracic and lumbar spine of nine subjects (44,88 years old). Nine fields (2 × 1.5 mm) were observed on each block. Several bone structural units (BSUs) were visible on a single trabecula, illustrating a dynamic, historical aspect of bone remodeling. A bridge was defined as a single and recent BSU connecting two segments of trabeculae previously separated by osteoclastic resorption. They were counted and measured (length and breadth, ,m). Results and Conclusion: We observed 396 bridges over 2376 images. By comparison, we found only 15 microcalluses on the same material. The median length of the bridge was 165 ,m (range, 29,869 ,m); 86% being longer than 100 ,m and 35% longer than 200 ,m. Their breadth was 56 ,m (range, 6,255 ,m), but the thinnest were still in construction. Bridges were found in all nine subjects included in the study, suggesting that it is a common feature of normal vertebral bone remodeling. These observations support the hypothesis that perforation could be repaired by new bone formation. and hence, might not be systematically irreversible. [source]

Phosphorylcholine-Coated Circuits Improve Preservation of Platelet Count and Reduce Expression of Proinflammatory Cytokines in CABG: A Prospective Randomized Trial

JOURNAL OF CARDIAC SURGERY, Issue 4 2009
Costas J. Schulze M.D.
Phosphorylcholine (PC) is a new-generation coating material designed to ameliorate biocompatibility and thereby to reduce the detrimental interactions of CPB. We studied the effects of PC-coated perfusion circuits on platelet function and the humoral and cellular response to CPB. Methods: Thirty patients undergoing coronary artery bypass grafting were randomized to PC-coated (PC group, n = 15) and noncoated (control group, n = 15) circuit groups. Clinical data, total blood loss, and pre- and postoperative platelet counts were recorded and IL-6 and TNF-,, CD41a, CD42b, and CD62p were measured at induction of anesthesia, after the initiation of CPB and at termination of CPB. Results: There was a significantly improved preservation of platelet count following CPB in the PC group (p = 0.028), which was sustained over a period of 72 hours. The use of PC-coated circuits further resulted in a significant attenuation of TNF-, and IL-6 expression (p < 0.05 and p < 0.01); however, we were unable to detect any differences in clinical outcomes. Conclusions: Despite similar clinical outcome, the obvious reduction of cytokine expression and improved preservation of platelet count suggest superior biocompatibility of PC-coated circuits. [source]

On "Onlay Patch for Complete Intercostals Artery Preservation During Thoracic and Thoracoabdominal Aortic Aneurysm Repair"

JOURNAL OF CARDIAC SURGERY, Issue 6 2005
Irving L. Kron M.D.
No abstract is available for this article. [source]

Long-Term Effectiveness of Operative Procedures for Stanford Type A Aortic Dissections

JOURNAL OF CARDIAC SURGERY, Issue 3 2004
Rudolf Driever
Methods: From 1990 to 1999, 50 patients (32 men (64.07%); 18 women, (36.0%); mean age 57.4 ± 11.1 years) underwent operation for ascending aortic dissection. Surgical strategies included aortic root replacement with a composite graft (21/50; 42.0%), valve replacement with supracoronary ascending aortic graft (3/50, 6%), and valve preservation or repair (26/50; 52.0%). Results: Overall hospital mortality rate was 18.0%. Follow-up was completed for 47 patients (94.0%) and ranged from 1 month to 10.5 years (mean 28.8 months). Actuarial survival for patients discharged from the hospital was 84% at 1 year, 75% at 5 years, and 66% at 10 years. There was no significant difference between the various procedures regarding mortality, neurological complications, long-term survival, and proximal reoperations. The ascending aorta alone was replaced in 8 of 50 patients (16%), ascending and hemiarch in 30 of 50 patients (60%), and arch and proximal descending aorta in 12 of 50 patients (24%). Hospital mortality (11.5%, 20.0%, and 16.7%, respectively; p > 0.05) and 5- and 10-year survival (p > 0.05) were not statistically dependent on the extension of the resection distally. Residual distal dissection was not associated with a decrease in late survival. With regard to emergency surgery (36/50) there was no significant difference in hospital mortality (p > 0.05) and 5-year survival (p > 0.05) between those who had undergone coronary angiography (19/36; 52.8%) on the day of surgery with those who had not (17/36; 47.2%). Conclusions: Preservation or repair of the aortic valve can be recommended in the majority of patients with type A dissection. Distal extension of the resection does not increase surgical risk. Residual distal dissection does not decrease late survival. Preoperative coronary angiography may not affect survival in patients undergoing emergency surgery. (J Card Surg 2004;19:240-245) [source]

Overview and Future Practice Patterns in Cardiac and Pulmonary Preservation

JOURNAL OF CARDIAC SURGERY, Issue 2 2000
John V. Conte M.D.
Successful transplantation requires preservation of allografts until they can be implanted and reperfused. In the decades since the transplantation of thoracic organs became a clinical reality, many advances have been made in preoperative donor management, procurement, and preservation techniques. This article summarizes the state of the art in heart and lung preservation and review some of the areas of current research that may lead to improvements in preservation techniques in the future. [source]

Heart and Lung Preservation for Transplantation

JOURNAL OF CARDIAC SURGERY, Issue 2 2000
Charles B. Huddleston M.D.
One of the major causes of death early following heart or lung transplantation is graft failure. Factors that play a role in this problem include recipient and donor issues, but clearly procurement techniques and preservation solutions are important. This article summarizes the history, current clinical practice, and research devoted to heart and lung preservation for transplantation. [source]