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1

Localized sclerotic bone response demonstrated reduced nanomechanical creep properties.  

Science.gov (United States)

Sclerosis (tissue hardening) development is a common occurrence in slow growing or benign osteolytic lesions. However, there is lack of knowledge on the mechanical and material property changes associated with sclerotic bone response. The immune system is postulated to play a relevant role in evoking sclerotic bone responses. In this study, localized sclerotic response in an immunocompetent model of Walker 256 breast carcinoma in SD rats showed an apparent increase in new reactive bone formation. Sclerotic rat femurs had significant increases in bone mineral density (BMD), bone mineral content (BMC), bone volume fraction (BV/TV), bone surface density (BS/TV), trabecular number (Tb.N) and a significant decrease in trabecular separation (Tb.Sp) and structural model index (SMI) as compared to control rat femurs. Significantly reduced creep responses (increased ?) were observed for both trabecular and cortical bone in sclerotic bones while no significant difference was observed in elastic modulus (E) and hardness (H) values. Therefore, we conclude that viscoelastic creep property using nanoindentation would serve as a more sensitive indicator of localized bone modeling than elastic properties. Moreover, reduced viscoelasticity can contribute towards increased microcrack propagation and therefore reduced toughness. Since significant positive correlations between elastic properties (E) and (H) with viscosity (?) were also observed, our results indicate that sclerotic response of bone metastasis would cause reduced toughness (increased ?) with stiffening of material (increased E and H). PMID:23127639

Chen, Xiuli; Goh, James Cho Hong; Teoh, Swee Hin; De, Shamal Das; Soong, Richie; Lee, Taeyong

2013-01-01

2

Detection of Mycobacterium tuberculosis DNA in the sclerotic spinal wall.  

Science.gov (United States)

Recent studies have shown that the major spinal lesion in spinal tuberculosis is predominantly sclerotic and accounts for >70% of the lesion. In this type of sclerosis, apart from spinal reactive hyperplasia and increased bone density, the most severe lesion is the formation of a hard outer osteoid shell (the sclerotic wall) around the cheese-like substances and granulated tissues. In the current study, polymerase chain reaction detection of Mycobacterium tuberculosis in the sclerotic wall was performed. Surgical specimens were obtained from 18 patients with spinal tuberculosis with peripheral sclerotic wall (as shown by computed tomography) and included the sclerotic wall, subnormal bone tissue outside the sclerotic wall, and iliac bone tissue (control). The IS986 gene in the samples was amplified by polymerase chain reaction followed by DNA sequencing. The obtained sequences were then compared with the published sequences in GenBank using DNATools version 5.1 software (International Centre for Genetic Engineering and Biotechnology, Trieste, Italy). The polymerase chain reaction results showed that 16 specimens from the sclerotic spinal wall, 3 from the subnormal bone, and 0 from the controls were positive for M tuberculosis, indicating a statistically significant difference (P<.05). These results indicated that M tuberculosis was present in the spinal sclerotic wall. Combined with our previous studies, we conclude that the sclerotic wall should be considered a lesion in patients with spinal tuberculosis. PMID:22385454

Si, Jianwei; Geng, Guangqi; Wang, Zili

2012-03-01

3

An Inflammatory Dentigerous Cyst Shows Rim Uptake on Bone Scan: A Case Report  

International Nuclear Information System (INIS)

Dentigerous cysts are developmental odontogenic jaw cysts, commonly manifesting in the 2nd and 3rd decades of life. This article presents an extremely rare case of dentigerous cyst showing increased uptake in the peripheral rim on bone scan. Herein, we discuss the clinical, radiographic, and histologic features of dentigerous cysts as well as the pathological mechanism underlying their activities on the bone scan. Bone scan was a sensitive tool for detecting the biologic activity of dentigerous cyst in our case

4

A study on the healing process of bone defect-examination of healing stages of bone defect in the irradiated mandibular rim by microradiography and autoradiography  

International Nuclear Information System (INIS)

The mandibular rim of 150 female Donryu strain rats was exposed to 2000 rads (B group) or to 3000 rads (C group), and a bone defect of 1 x 1 x 2 mm in size was formed in the madibular rim. Cure process of this bone defect was observed periodically by microradiography and autoradiography using 45Ca as a tracer, compared with that in the control group (A group, non-irradiated). Irradiated rats having bone defects recovered smoothly. Microradiographic findings of the A group showed that new bone was formed on the surface of the perosteum of the mandible on the 7th days after the irradiation. Bone defects in all rats were repaired completely by the 49th days after the irradiation. Microradiographic findings of the B and C groups showed that new bone was formed on the tongue side surface of the periosteum of the mandible in the early stage after the irradiation. However, after that, osteogenesis became slower, and the edge of bone defects or a part of the mandible became smaller. Bone defects were not repaired and became larger. These findings were more marked in the C group than in the B group. Autoradiographic findings showed marked uptake of 45Ca into new bone in the A group. Rats of which bone defects were repaired showed the uptake of 45Ca in accordance with the shape of the mandibular rim. The edge of bone defect of the B and C groups where new bone was not formed was destroyed since the 14th day after the irradiation. There were someday after the irradiation. There were some cases in which the uptake of 45Ca into the surface of the periosteum of the mandible near bone defect was observed even when bone defect was enlarged. (Tsunoda, M.)

5

Sclerotic Vertebral Metastases: Pain Palliation Using Percutaneous Image-Guided Cryoablation  

International Nuclear Information System (INIS)

Cryoablative therapies have been proposed to palliate pain from soft-tissue or osteolytic bone tumors. A case of a patient with painful thoracic and sacral spine sclerotic metastases successfully treated by image-guided percutaneous cryoablation with the aid of insulation techniques and thermosensors is reported in this case report.

6

Pinhole bone scintigraphic manifestation of fibrous dysplasia  

International Nuclear Information System (INIS)

To evaluate the pinhole scintigraphic findings and its significance, authors retrospectively compared the pinhole bone scintigrams and corresponding radiograms of 16 lesions in 14 patients with fibrous dysplasia. They were diagnosed pathologically in 10 lesions and radiologically in 6 lesions. The mean age of patients was 41.1 years. The mean interval between two studies was 1.1 days. Locations were ribs 7, pelvic bone 4, clavicle 1, long bones 4(femur 2, tibia 1, humerus 1). The radiographic findings were as follows: the central portions were radiolucent (n=9), ground-glass opacities (n=5) or sclerotic (n=2) and the peripheral appearance were sclerotic rim(n=5), septation (n=7), cortical perforation (n=10) and invisible cortical thinning (n=9). Pinhole scintigraphic findings were as follows; Central portions showed normal 1+ uptake in 6 cases (radiolucent 5, ground-glass opacity 1), slightly increased 2+ uptake in 7 cases (radiolucent 4, ground-glass opacity 3), and marked 3+ uptake in 3 cases (ground-glass opacity 1, sclerotic 2). The 15 of 16 lesions showed more intense uptake in the peripheral portion; slightly increased 2+ uptake corresponding to the sclerotic rim(5/5) and unvisible cortical thinning (1/9), and irregular foci of marked 3 + uptake corresponding to septation (7/7), cortical perforation (10/10) and invisible cortical thinning (8/9). One of 16 lesions showed homogeneous 2+ uptake. In conclusion, pinhole scintigram provides information on regional activity of the fibrous dysplasia, which would be helpful in diagnosis, prediction of prognosis and determination of treatment plan

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Pinhole bone scintigraphic manifestation of fibrous dysplasia  

Energy Technology Data Exchange (ETDEWEB)

To evaluate the pinhole scintigraphic findings and its significance, authors retrospectively compared the pinhole bone scintigrams and corresponding radiograms of 16 lesions in 14 patients with fibrous dysplasia. They were diagnosed pathologically in 10 lesions and radiologically in 6 lesions. The mean age of patients was 41.1 years. The mean interval between two studies was 1.1 days. Locations were ribs 7, pelvic bone 4, clavicle 1, long bones 4(femur 2, tibia 1, humerus 1). The radiographic findings were as follows: the central portions were radiolucent (n=9), ground-glass opacities (n=5) or sclerotic (n=2) and the peripheral appearance were sclerotic rim(n=5), septation (n=7), cortical perforation (n=10) and invisible cortical thinning (n=9). Pinhole scintigraphic findings were as follows; Central portions showed normal 1+ uptake in 6 cases (radiolucent 5, ground-glass opacity 1), slightly increased 2+ uptake in 7 cases (radiolucent 4, ground-glass opacity 3), and marked 3+ uptake in 3 cases (ground-glass opacity 1, sclerotic 2). The 15 of 16 lesions showed more intense uptake in the peripheral portion; slightly increased 2+ uptake corresponding to the sclerotic rim(5/5) and unvisible cortical thinning (1/9), and irregular foci of marked 3 + uptake corresponding to septation (7/7), cortical perforation (10/10) and invisible cortical thinning (8/9). One of 16 lesions showed homogeneous 2+ uptake. In conclusion, pinhole scintigram provides information on regional activity of the fibrous dysplasia, which would be helpful in diagnosis, prediction of prognosis and determination of treatment plan.

Baek, Jee Hee; Lee, Sung Yong; Kim, Sung Hoon [College of Medicine, The Catholic Univ. of Korea, Seoul (Korea, Republic of)] [and others

1997-07-01

8

Morphology of autogenous bone graft and castor oil polyurethane in the infraorbital rim of rabbits: a comparative study  

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PURPOSE: Morphological study comparing castor oil polyurethane and autogenous bone graft to repair bone defect in zygomatic bone of rabbits. METHODS: Twenty-four adult, male New Zealand rabbits were randomly distributed between two groups of twelve. Bone defects of 5mm in diameter were cut through the zygomatic bone and filled with polyurethane discs in the experimental group or autogenous bone harvested from the tibia in the control group. Animals were sacrificed after 30, 60 or 90 days, and...

Mendonça José Carlos Garcia de; De Rossi Rafael; Inouye Celso Massaschi; Bazan Diego Rodrigo Paulillo; Monteiro João Carlos Castro; Mendonça Juliana Pedroso de

2006-01-01

9

Bone Scintigraphy and Panoramic Radiography in Deciding the Extent of Bone Resection in Benign Jaw Lesions  

Science.gov (United States)

Objective: To find out the value of correlating radiographic and scintigraphic imaging for defining the extent and nature of benign jaw lesions (BJL). Material and Methods: Twenty patients with histologically proven benign lesions of the jaws were investigated pre-operatively by panoramic radiography (PR) and bone scintigraphy (BS). To test the efficacy of combination of these two imaging modalities, their results were compared with intra-operative and histopathological findings. Result: Most of the benign lesions presented radiographically as well-defined bone destructions with fine sclerotic rims. Such lesions were found to be silent on scintigraphs and the extent of radionuclide uptake was same as radiographically visible extent of bone involvement. However, aggressive lesions showed ill-defined bone destructions without sclerotic rims on radiographs and their scintigraphic uptake correctly exceeded the radiographic extent of the bone involvement. Conclusion: The efficacy of combination of both complementary imagings is rewarding in defining the extent of the BJL, especially when radiographic margins are not so well defined. So, that surgical excisions will be complete and the possibility recurrences is reduced. PMID:24298527

Jamdade, Anshuman; John, Ani

2013-01-01

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Morphology of autogenous bone graft and castor oil polyurethane in the infraorbital rim of rabbits: a comparative study  

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Full Text Available PURPOSE: Morphological study comparing castor oil polyurethane and autogenous bone graft to repair bone defect in zygomatic bone of rabbits. METHODS: Twenty-four adult, male New Zealand rabbits were randomly distributed between two groups of twelve. Bone defects of 5mm in diameter were cut through the zygomatic bone and filled with polyurethane discs in the experimental group or autogenous bone harvested from the tibia in the control group. Animals were sacrificed after 30, 60 or 90 days, and the zygomatic bones were macro- and microscopically analyzed. Student's, Fisher's, chi-squared and McNemar's tests were used for statistical analysis. RESULTS: Both the castor oil polyurethane and the autograft adapted well to the defect, with no need for fixation. Fibrous connective tissue encapsulated the polyurethane, but no inflammation or giant cell reaction was observed. Acidophilic and basophilic areas were observed inside the micropores of the polyurethane, suggesting cell nuclei. After 90 days, bone repair with a lamellar pattern of organization was observed in the control group. CONCLUSION: The castor oil polyurethane was biocompatible and did not cause inflammation. It may be considered an alternative to fill bone defects.

Mendonça José Carlos Garcia de

2006-01-01

11

The sclerotic pedicle - how many causes are there?  

International Nuclear Information System (INIS)

The sclerotic pedicle is a commonly encountered roentgen sign that may be associated with numerous conditions, both benign and malignant. The following paper discusses the common as well as the unusual causes of this interesting phenomenon and demonstrates the radiographic presentations of the various etiologies. (orig.)

12

Fiber composite flywheel rim  

Science.gov (United States)

A flywheel 2 comprising a hub 4 having at least one radially projecting disc 6, an annular rim 14 secured to said disc and providing a surface circumferential to said hub, a first plurality of resin-impregnated fibers 22 wound about said rim congruent to said surface, and a shell 26 enclosing said first plurality of fibers and formed by a second plurality of resin-impregnated fibers wound about said rim tangentially to said surface.

Davis, Donald E. (Thousand Oaks, CA); Ingham, Kenneth T. (Woodland Hills, CA)

1987-01-01

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Dopamine-Mediated Sclerotization of Regenerated Chitin in Ionic Liquid  

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Full Text Available Chitin is a promising structural material for biomedical applications, due to its many advantageous properties and abundance in nature. However, its usage and development in the biomedical field have been stagnant, because of chitin’s poor mechanical properties in wet conditions and the difficulties in transforming it into an applicable form. To overcome these challenges, we created a novel biomimetic chitin composite. This regenerated chitin, prepared with ionic liquid, showed improved mechanical properties in wet conditions by mimicking insect cuticle and squid beak sclerotization, i.e., catechol-meditated cross-linking. By ionic liquid-based heat treatment, dopamine oxidation produced melanin-like compounds and dopamine-meditated cross-links without any solvent evaporation and oxidant utilization. The dopamine-meditated sclerotization increased the ultimate tensile strength (UTS of the regenerated chitin by 2.52-fold, measured after six weeks of phosphate-buffered saline (PBS submersion. In addition, the linear swelling ratio (LSR of the chitin film was reduced by about 22%. This strategy raises a possibility of using regenerated chitin as an artificial hard tissue in wet conditions.

Dongyeop X. Oh

2013-09-01

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Multifocal sclerotic BCG spondylitis in a 13-year-old girl  

International Nuclear Information System (INIS)

A case is reported of multifocal BCG osteomyelitis in a 13-year-old girl. The lesions in the skull, ribs and in several vertebrae were mainly sclerotic and healed with antituberculotic therapy. The case is unusual because of the late onset, sclerotic changes, and involvement of the spine. (orig.)

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Micromorphological and hardness analyses of human and bovine sclerotic dentin: a comparative study.  

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The purpose of this study was to test the hypothesis that both human and bovine sclerotic dentin have similar hardness properties, in addition to similar micromorphological characteristics. Sixteen teeth (8 human and 8 bovine) exhibiting exposed dentin in the incisal edge and showing characteristics typical of sclerosis were used. Vickers surface microhardness testing was conducted. Three areas of the dentin surface of each specimen were selected. All teeth were processed for scanning electron microscopy in order to estimate the amount (in percentage) of solid dentin on the sclerotic dentin surface. The data were compared by Student's t test (? = 0.05). The micromorphological and microhardness data were compared by Pearson's linear correlation test (? = 0.05). The mean percentages of solid dentin of human and bovine sclerotic dentin were similar (human 90.71 ± 0.83 and bovine 89.08 ± 0.81, p = 0.18). The mean microhardness value (VHN) of human sclerotic dentin was significantly higher than that of bovine sclerotic dentin (human 45.26 ± 2.92 and bovine 29.93 ± 3.83, p = 0.006). No correlation was found between the microhardness values and the amount of solid dentin in the sclerotic dentin, irrespective of the species considered (human R² = 0.0240, p = 0.714; bovine R² = 0.0017, p = 0.923; and combined R² = 0.038, p = 0.46). We concluded that although both bovine and human sclerotic dentin present a similar amount of solid tissue, human sclerotic dentin presents higher microhardness than bovine sclerotic dentin. PMID:21670860

Castanho, Gisela Muassab; Marques, Márcia Martins; Marques, Juliana Barbosa; Camargo, Maitê André; De Cara, Antonio Alberto

2011-01-01

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Micromorphological and hardness analyses of human and bovine sclerotic dentin: a comparative study  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english The purpose of this study was to test the hypothesis that both human and bovine sclerotic dentin have similar hardness properties, in addition to similar micromorphological characteristics. Sixteen teeth (8 human and 8 bovine) exhibiting exposed dentin in the incisal edge and showing characteristics [...] typical of sclerosis were used. Vickers surface microhardness testing was conducted. Three areas of the dentin surface of each specimen were selected. All teeth were processed for scanning electron microscopy in order to estimate the amount (in percentage) of solid dentin on the sclerotic dentin surface. The data were compared by Student's t test (? = 0.05). The micromorphological and microhardness data were compared by Pearson's linear correlation test (? = 0.05). The mean percentages of solid dentin of human and bovine sclerotic dentin were similar (human 90.71 ± 0.83 and bovine 89.08 ± 0.81, p = 0.18). The mean microhardness value (VHN) of human sclerotic dentin was significantly higher than that of bovine sclerotic dentin (human 45.26 ± 2.92 and bovine 29.93 ± 3.83, p = 0.006). No correlation was found between the microhardness values and the amount of solid dentin in the sclerotic dentin, irrespective of the species considered (human R² = 0.0240, p = 0.714; bovine R² = 0.0017, p = 0.923; and combined R² = 0.038, p = 0.46). We concluded that although both bovine and human sclerotic dentin present a similar amount of solid tissue, human sclerotic dentin presents higher microhardness than bovine sclerotic dentin.

Gisela Muassab, Castanho; Márcia Martins, Marques; Juliana Barbosa, Marques; Maitê André, Camargo; Antonio Alberto De, Cara.

2011-06-01

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Micromorphological and hardness analyses of human and bovine sclerotic dentin: a comparative study  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english The purpose of this study was to test the hypothesis that both human and bovine sclerotic dentin have similar hardness properties, in addition to similar micromorphological characteristics. Sixteen teeth (8 human and 8 bovine) exhibiting exposed dentin in the incisal edge and showing characteristics [...] typical of sclerosis were used. Vickers surface microhardness testing was conducted. Three areas of the dentin surface of each specimen were selected. All teeth were processed for scanning electron microscopy in order to estimate the amount (in percentage) of solid dentin on the sclerotic dentin surface. The data were compared by Student's t test (? = 0.05). The micromorphological and microhardness data were compared by Pearson's linear correlation test (? = 0.05). The mean percentages of solid dentin of human and bovine sclerotic dentin were similar (human 90.71 ± 0.83 and bovine 89.08 ± 0.81, p = 0.18). The mean microhardness value (VHN) of human sclerotic dentin was significantly higher than that of bovine sclerotic dentin (human 45.26 ± 2.92 and bovine 29.93 ± 3.83, p = 0.006). No correlation was found between the microhardness values and the amount of solid dentin in the sclerotic dentin, irrespective of the species considered (human R² = 0.0240, p = 0.714; bovine R² = 0.0017, p = 0.923; and combined R² = 0.038, p = 0.46). We concluded that although both bovine and human sclerotic dentin present a similar amount of solid tissue, human sclerotic dentin presents higher microhardness than bovine sclerotic dentin.

Gisela Muassab, Castanho; Márcia Martins, Marques; Juliana Barbosa, Marques; Maitê André, Camargo; Antonio Alberto De, Cara.

18

Degraded Crater Rim  

Science.gov (United States)

(Released 3 May 2002) The Science The eastern rim of this unnamed crater in Southern Arabia Terra is very degraded (beaten up). This indicates that this crater is very ancient and has been subjected to erosion and subsequent bombardment from other impactors such as asteroids and comets. One of these later (younger) craters is seen in the upper right of this image superimposed upon the older crater rim material. Note that this smaller younger crater rim is sharper and more intact than the older crater rim. This region is also mantled with a blanket of dust. This dust mantle causes the underlying topography to take on a more subdued appearance. The Story When you think of Arabia, you probably think of hot deserts and a lot of profitable oil reserves. On Mars, however, Southern Arabia Terra is a cold place of cratered terrain. This almost frothy-looking image is the badly battered edge of an ancient crater, which has suffered both erosion and bombardment from asteroids, comets, or other impacting bodies over the long course of its existence. A blanket of dust has also settled over the region, which gives the otherwise rugged landscape a soft and more subdued appearance. The small, round crater (upper left) seems almost gemlike in its setting against the larger crater ring. But this companionship is no easy romance. Whatever formed the small crater clearly whammed into the larger crater rim at some point, obliterating part of its edge. You can tell the small crater was formed after the first and more devastating impact, because it is laid over the other larger crater. How much younger is the small one? Well, its rim is also much sharper and more intact, which gives a sense that it is probably far more youthful than the very degraded, ancient crater.

2002-01-01

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Rim Sign in Acute Cholecystitis  

International Nuclear Information System (INIS)

The 'rim sign' is a rim of increased hepatic activity adjacent to the gall bladder fossa and known as an useful indicator of acute cholecystitis. Also, many reports suggested that if rim sign is positive there is an increased risk for complications such as perforation and gangrene. To evaluate the usefulness of this rim sign, we reviewed 32 cases that were pathologically confirmed. The incidence of rim sign was 47% similar to other reports but with our results, the rim sign was not specific to acute cholecystitis nor indicator of increased risk for complications.

20

Imaging features and diagnostic value of bone lipoma  

International Nuclear Information System (INIS)

Objective: To study the imaging manifestations of bone lipoma and their diagnostic value. Methods: Ten cases with pathologically proved lipoma of bone were analyzed, and the literature was reviewed. Results: Eight of 10 cases were intraosseous lipomas which were located in the femoral neck (1 case), the femoral neck-intertrochanter area (1 case), the acetabulum (4 cases) and the calcaneus (2 cases), respectively. All foci showed oval or irregular radiolucent area on X-ray film and adipose tissue area with thin or thick sclerotic rim on CT images. The fat attenuation values within the lesion were in the range of -22 to - 120 Hounsfield units. Focal intralesional calcifications in the center or margin within the intraosseous lipoma were present in 6 foci. The other 2 cases were juxtacortical lipomas, which showed the irregular adipose tissue area beside bone with reactive bony proliferation. Conclusion: The lipoma of bone has common imaging features, that is, mainly composed of fatty tissue. However, the imaging manifestations of bone lipoma in different locations are somewhat different, and they could be diagnosed correctly before operation by using CT. (authors)

 
 
 
 
21

RIMS: Resource Information Management System  

Science.gov (United States)

An overview is given of the capabilities and functions of the resource management system (RIMS). It is a simple interactive DMS tool which allows users to build, modify, and maintain data management applications. The RIMS minimizes programmer support required to develop/maintain small data base applications. The RIMS also assists in bringing the United Information Services (UIS) budget system work inhouse. Information is also given on the relationship between the RIMS and the user community.

Symes, J.

1983-01-01

22

Rim of 'Erebus'  

Science.gov (United States)

The center upper portion of this image shows a portion of the rim of 'Erebus Crater' in the Meridiani Planum region of Mars. This approximately true-color view from the panoramic camera on NASA's Mars Exploration Rover Opportunity is a composite of frames acquired on the rover's 657th Martian day, or sol, (Nov. 28, 2005). This is a small portion of a large panorama. Other portions of the panorama were still being shot three sols later. This view is a composite of separate images taken through the camera's 750-nanometer, 530-nanometer and 430-nanometer filters.

2005-01-01

23

Arsia Mons Caldera Rim  

Science.gov (United States)

[figure removed for brevity, see original site] This VIS image shows part of the caldera rim and floor of Arsia Mons. The arcuate fractures along the rim indicate multiple periods of activity -- both eruptions and collapse after eruptions. The floor of the caldera is very flat, having been filled by lava. Image information: VIS instrument. Latitude -9, Longitude 238.8 East (121.2 West). 17 meter/pixel resolution. Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.

2005-01-01

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CUTANEOUS MYXOID CYST ON THE SCLEROTIC FINGER IN A PATIENT WITH DIFFUSE SYSTEMIC SCLEROSIS  

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Full Text Available Skin tumors occurring on the scleroderma fingers are rarely seen. Swollen fingers are hallmarks of systemic sclerosis, and mucin deposition in the lesional skin is a constant feature in systemic sclerosis. Here we describe a case of cutaneous myxoid cyst on the flexor aspect of the sclerotic fingers in a patient with severe diffuse cutaneous systemic sclerosis. Cutaneous myxoid cyst is a relatively common benign tumor; however, cases of cutaneous myxoid cysts developing on the scleroderma fingers have not been reported to date. Mucin deposition in the sclerotic skin may be a predisposing factor in the induction of myxoid cyst on the scleroderma finger in our patient.

Taeko Nakamura-Wakatsuki

2013-10-01

25

Pacific Rim Archive  

Science.gov (United States)

The Pacific Rim Archive features archival materials related to America's first century of involvement in and impressions of East Asia, broadly defined as the period from 1840 to 1940. Housed at the University of Southern California Digital Library, the five subcollections here include the Mark L. Moody Collection and the Saidee Pettus Hoose Collection. The Moody Collection contains the most items, featuring hundreds of photographs from around China in the 1920s and 1930s, including many images of Shanghai. As Moody owned a car dealership there, it's not surprising that many of the photos here are of cars, along with motor and gas stations. Additionally, users can browse suggested topics, such as "Marines,â "Chrysler,â and "Trains.âÂÂ

26

The use of qualitative and quantitative polymerase chain reactions for diagnosis of cytomegalovirus infections in bone marrow and kidney transplant recipients Desenvolvimento e aplicação de PCRs quali-quantitativas para diagnóstico de citomegalovirose em transplantados de rim e medula óssea  

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Full Text Available The purpose of this work was to test a cytomegalovirus qualitative PCR and a semi-quantitative PCR on the determination of CMV load in leukocytes of bone marrow and kidney transplanted (RT patients. Thirty three BMT and 35 RT patients participated of the study. The DNA was subjected to a qualitative PCR using primers that amplify part of CMV gB gene. CMV load of positive samples was determined by a semi-quantitative PCR using quantified plasmids inserted with part of the gB gene of CMV as controls. The sensitivity of the test was determined to be 867 plasmid copies/µg DNA. CMV loads between 2,118 and 72,443 copies/µg DNA were observed in 12.1% BMT recipients and between 1,246 and 58,613 copies/µg DNA in 22.9% RT recipients. Further studies are necessary to confirm the usefulness of this CMV semi-quantitative PCR in transplanted patients.O objetivo deste trabalho foi testar uma PCR qualitativa e uma PCR semiquantitativa para CMV para determinar a carga de CMV nos leucócitos de pacientes transplantados de medula óssea e transplantados de rim. Trinta e três pacientes TMO e 35 TR participaram deste estudo. O DNA foi testado pela PCR qualitativa utilizando primers que amplificam parte do gene gB de CMV. As cargas de CMV das amostras positivas foram determinadas pela PCR semi-quantitativa utilizando como controle plasmídios quantificáveis inseridos com parte do gene gB de CMV. A sensibilidade do teste foi de 867 plamídios/µg DNA. Cargas de CMV entre 2.118 e 72.443 copias/µg DNA foram observadas em 12,1% dos TMO entre 1,246 e 58,613 cópias/µg DNA foram observadas em 22,9% dos TR. Futuros estudos, com maiores casuísticas são necessários para confirmar a utilidade desta PCR semiquantitativa para CMV em pacientes transplantados.

Lauro Juliano Marin

2004-03-01

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Parietal epithelial cells participate in the formation of sclerotic lesions in focal segmental glomerulosclerosis.  

Science.gov (United States)

The pathogenesis of the development of sclerotic lesions in focal segmental glomerulosclerosis (FSGS) remains unknown. Here, we selectively tagged podocytes or parietal epithelial cells (PECs) to determine whether PECs contribute to sclerosis. In three distinct models of FSGS (5/6-nephrectomy + DOCA-salt; the murine transgenic chronic Thy1.1 model; or the MWF rat) and in human biopsies, the primary injury to induce FSGS associated with focal activation of PECs and the formation of cellular adhesions to the capillary tuft. From this entry site, activated PECs invaded the affected segment of the glomerular tuft and deposited extracellular matrix. Within the affected segment, podocytes were lost and mesangial sclerosis developed within the endocapillary compartment. In conclusion, these results demonstrate that PECs contribute to the development and progression of the sclerotic lesions that define FSGS, but this pathogenesis may be relevant to all etiologies of glomerulosclerosis. PMID:21719782

Smeets, Bart; Kuppe, Christoph; Sicking, Eva-Maria; Fuss, Astrid; Jirak, Peggy; van Kuppevelt, Toin H; Endlich, Karlhans; Wetzels, Jack F M; Gröne, Hermann-Josef; Floege, Jürgen; Moeller, Marcus J

2011-07-01

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Astrocytic expression of cannabinoid type 1 receptor in rat and human sclerotic hippocampi.  

Science.gov (United States)

Cannabinoid type 1 receptor (CB1R), which is traditionally located on axon terminals, plays an important role in the pathology of epilepsy and neurodegenerative diseases by modulating synaptic transmission. Using the pilocarpine model of chronic spontaneous recurrent seizures, which mimics the main features of mesial temporal lobe epilepsy (TLE) with hippocampal sclerosis (HS) in humans, we examined the expression of CB1R in hippocampal astrocytes of epileptic rats. Furthermore, we also examined the expression of astrocytic CB1R in the resected hippocampi from patients with medically refractory mesial TLE. Using immunofluorescent double labeling, we found increased expression of astrocytic CB1R in hippocampi of epileptic rats, whereas expression of astrocytic CB1R was not detectable in hippocampi of saline treated animals. Furthermore, CB1R was also found in some astrocytes in sclerotic hippocampi in a subset of patients with intractable mesial TLE. Detection with immune electron microscopy showed that the expression of CB1R was increased in astrocytes of epileptic rats and modest levels of CB1R were also found on the astrocytic membrane of sclerotic hippocampi. These results suggest that increased expression of astrocytic CB1R in sclerotic hippocampi might be involved in the cellular basis of the effects of cannabinoids on epilepsy. PMID:25031702

Meng, Xian-Dong; Wei, Dong; Li, Juan; Kang, Jun-Jun; Wu, Chen; Ma, Lei; Yang, Feng; Zhu, Ge-Min; Ou-Yang, Tang-Peng; Liu, Ying-Ying; Jiang, Wen

2014-01-01

29

Ewing's sarcoma of the tarsal bone  

International Nuclear Information System (INIS)

The Ewing's sarcoma comprises approximately less than 10 percent of malignant bone tumors and 5 percent of all bone tumors, occurs in almost all bones of the body, and presents a widely divergent roentgenographic manifestations. The tarsal bones are involved only 2 percent in the Ewing's sarcoma. Two cases experienced by authors and ten cases published in literatures of Ewing's sarcoma of the tarsal bone were analyzed retrospectively. The result were as follows: 1. Of the tarsal bones, the calcaneus was 7 cases, the talus 4 cases, cuneiform 1 case. 2. Female was affected more commonly than male, the ratio being 4 to 1 in the tarsal bones. 3. About sixty percent of total cases in the tarsal bones had evidence of diffuse sclerotic pattern. All the cases of the talus had evidence of diffuse sclerotic pattern. 4. The diseases to be considered in differential diagnosis are as follows: avascular necrosis, tuberculous osteomyelitis, osteosarcoma, and pyogenic osteomyelitis. 5. The diffuse sclerosis radiographically showed a close relation with dead bone resulting from avascular necrosis due to tumor infiltration histologically. Periosteal reactive new bone and osteoid deposition on the dead bone were also correlated with diffuse sclerosis. 6. Because it is difficult to differentiate sclerotic lesions in the tarsal bones by radiographic methods alone, all such lesions should be subject to biopsy as early as possible

30

Portable basketball rim testing device  

Science.gov (United States)

A portable basketball rim rebound testing device 10 is illustrated in two preferred embodiments for testing the rebound or energy absorption characteristics of a basketball rim 12 and its accompanying support to determine likely rebound or energy absorption charcteristics of the system. The apparatus 10 includes a depending frame 28 having a C-clamp 36 for releasably rigidly connecting the frame to the basketball rim 12. A glide weight 60 is mounted on a guide rod 52 permitting the weight 60 to be dropped against a calibrated spring 56 held on an abutment surface on the rod to generate for deflecting the basketball rim and then rebounding the weight upwardly. A photosensor 66 is mounted on the depending frame 28 to sense passage of reflective surfaces 75 on the weight to thereby obtain sufficient data to enable a processing means 26 to calculate the rebound velocity and relate it to an energy absorption percentage rate of the rim system 12. A readout is provided to display the energy absorption percentage.

Abbott, W. Bruce (610 Clover St., Cheney, WA 99004); Davis, Karl C. (Box 722, Richland, WA 99352)

1993-01-01

31

Singular structures on liquid rims  

Science.gov (United States)

This experimental note is concerned with a new effect we discovered in the course of studying water hammering phenomena. Namely, the ejecta originating from the solid plate impact on a water surface brings about a liquid rim at its edge with the fluid flowing towards the rim center and forming a singular structure resembling a "pancake." Here, we present the experimental observations and a qualitative physical explanation for the effect, which proves to be fundamental to the situation when the size and speed of the impacting body are such that the capillary effects become important.

Mayer, Hans C.; Krechetnikov, Rouslan

2014-03-01

32

Window prototype investigations : Rim seal construction  

DEFF Research Database (Denmark)

This chapter describes the requirements to be set for a proper rim seal construction for aerogel glazings and includes theoretically parameter analyses of thermal bridge effect, water vapour diffusion and gas diffusion through the rim seal. Different ideas for rim seal solutions are described.

Schultz, JØrgen Munthe

1996-01-01

33

Anterior glenoid rim fracture: the value of helical CT with threedimensional reconstruction and electronic humeral disarticulation  

Directory of Open Access Journals (Sweden)

Full Text Available Objectives: To show a new three-dimensional reconstructiontechnique based on helical computed tomography images withelectronic humeral disarticulation in anterior glenoid rim fractures,correlating the anatomic specimen with simulation of an anteriorglenoid rim fracture, as well as evaluating the extension of thefracture, the bone fragment position and distance in relation to theglenoid cavity in six patients. Methods: One scapula and onehumerus with no signs of fracture or congenital malformationswere placed in anatomical position using an adhesive tape aftersimulating an anterior glenoid rim fracture made by an osteotome.Helical CT imaging was acquired and three-dimensionalreconstructions were made based on these images, with andwithout electronic humeral disarticulation. The bone fragment waslocated, measured and its position in relation to the glenoid cavitywas assessed. Six patients with anterior glenoid rim fracture weresubmitted to CT of the shoulder using the same parameters asthose applied to the anatomic specimen. Results: In the anatomicspecimen and in all six patients the bone fragment was clearlydemonstrated; bone fragment measurements in the anatomicspecimen and in three-dimensional reconstructions wereequivalent. The fragment was better demonstrated in the imagestaken with electronic humeral disarticulation, particularly in thefrontal view of the glenoid cavity as observed in all six patients.Conclusion: We concluded that our experiment with the anatomicspecimen and the study of six patients allow us to state that thistechnique is safe and accurate to demonstrate the extension, sizeand location of the bone fragment in anterior glenoid rim fractures,and it provides essential elements for therapeutic planning.

Heverton César de Oliveira

2003-06-01

34

On the Rim of 'Erebus'  

Science.gov (United States)

[figure removed for brevity, see original site] Click on the image for On the Rim of 'Erebus' (QTVR) This is the Opportunity panoramic camera's 'Erebus Rim' panorama, acquired on sols 652 to 663 (Nov. 23 to Dec. 5, 2005 ), as NASA's Mars Exploration Rover Opportunity was exploring sand dunes and outcrop rocks in Meridiani Planum. The panorama originally consisted of 635 separate images in four different Pancam filters, and covers 360 degrees of terrain around the rover and the full rover deck. Since the time that this panorama was acquired, and while engineers have been diagnosing and testing Opportunity's robotic arm, the panorama has been expanded to include more than 1,300 images of this terrain through all of the Pancam multispectral filters. It is the largest panorama acquired by either rover during the mission. The panorama shown here is an approximate true-color rendering using Pancam's 750 nanometer, 530 nanometer and 430 nanometer filters. It is presented here as a cylindrical projection. Image-to-image seams have been eliminated from the sky portion of the mosaic to better simulate the vista a person standing on Mars would see. This panorama provides the team's highest resolution view yet of the finely-layered outcrop rocks, wind ripples, and small cobbles and grains along the rim of the wide but shallow 'Erebus' crater. Once the arm diagnostics and testing are completed, the team hopes to explore other layered outcrop rocks at Erebus and then eventually continue southward toward the large crater known as 'Victoria.'

2006-01-01

35

Chondroblastoma of the Medial Cuneiform Bone in a 32-Year-Old Woman  

Science.gov (United States)

Patient: Female, 32 Final Diagnosis: Chondroblastoma Symptoms: Pain Medication: — Clinical Procedure: — Specialty: Oncology Objective: Unusual clinical course Background: 1% of all bone tumors are Chondroblastomas. Chondroblastomas, initially considered to be an osteoclastoma variant are benign, cartilaginous tumors which usually occur in the epiphysis of long bones, especially in the humerus, tibia, and femur, most common in children and young adults between the ages of 10 and 20 years. 4% of all chondroblastomas settle in the talus whereas cuneiform and other tarsal bones are very rare sites for the development of this benign chondroid lesion. Case Report: A case of chondroblastoma involving the medial cuneiform of the left foot of a 32-year-old woman is described. The patient presented with moderate localized pain and tenderness over the medial aspect of her left foot. Radiographs showed a lytic expansile lesion within the right cuneiform bone indicating a bone tumor. Biopsy demonstrated cellular areas made up of round, polygonal cells, with round-oval nucleus and chondroblasts that appear with a thin calcification rim. Intralesional curettage and synthetic bone grafting with PRP (Platelet-Rich Plasma) application was performed for its treatment. After 18 month follow up, osteointegration was observed with the defect completely filled and the patient was free of disease and pain. Conclusions: A painful, expansile, thin, sclerotic lesion detected at the cuneiform should arise suspicion for chondroblastoma even at age over 20 years. Meticulous curettage of the lesion from a small window with removal of the lesion followed by injectable phosphocalcic cement application with autologous PRP can be considered as a curative and technically simple treatment method. PMID:25072961

Ar?kan, Murat; Aktas, Erdem; Togral, Guray; Y?ld?r?m, Ahmet; Kandemir, Olcay

2014-01-01

36

Morphology of autogenous bone graft and castor oil polyurethane in the infraorbital rim of rabbits: a comparative study / Estudo morfológico comparativo do enxerto ósseo autógeno e polímero de mamona em rebordo infra-orbitário de coelhos  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese OBJETIVO: Estudo morfológico comparativo do implante de poliuretana de mamona e enxerto ósseo autógeno em defeito ósseo padrão em osso zigomático de coelhos. MÉTODOS: Vinte e quatro coelhos Nova Zelândia, machos, adultos, foram distribuídos aleatoriamente em dois grupos de 12. Defeitos de 5mm de diâ [...] metro, perenes, foram confeccionados em osso zigomático e preenchidos com discos pré-fabricados de poliuretana no grupo experimento ou osso autógeno extraído da tíbia no grupo controle. Os animais foram sacrificados após 30, 60 e 90 dias e as peças anatômicas foram avaliadas macro e microscopicamente. Foram utilizados os testes de Student, Fisher,qui-quadrado e McNemar para a análise estatística dos resultados. RESULTADOS: A poliuretana e o osso autógeno se adaptaram ao defeito sem necessidade de fixação. Houve formação de tecido conjuntivo fibroso envolvendo a poliuretana, sem reação inflamatória ou presença de células gigantes. Verificaram-se áreas acidófilas e basófilas nos poros do material implantado, sugestivas de núcleos celulares. No grupo controle, observou-se aos 90 dias o reparo ósseo de padrão lamelar clássico. CONCLUSÃO: A poliuretana de mamona foi biocompatível e não causou reação inflamatória deletéria. Pode ser uma alternativa para o preenchimento de defeitos ósseos. Abstract in english PURPOSE: Morphological study comparing castor oil polyurethane and autogenous bone graft to repair bone defect in zygomatic bone of rabbits. METHODS: Twenty-four adult, male New Zealand rabbits were randomly distributed between two groups of twelve. Bone defects of 5mm in diameter were cut through t [...] he zygomatic bone and filled with polyurethane discs in the experimental group or autogenous bone harvested from the tibia in the control group. Animals were sacrificed after 30, 60 or 90 days, and the zygomatic bones were macro- and microscopically analyzed. Student's, Fisher's, chi-squared and McNemar's tests were used for statistical analysis. RESULTS: Both the castor oil polyurethane and the autograft adapted well to the defect, with no need for fixation. Fibrous connective tissue encapsulated the polyurethane, but no inflammation or giant cell reaction was observed. Acidophilic and basophilic areas were observed inside the micropores of the polyurethane, suggesting cell nuclei. After 90 days, bone repair with a lamellar pattern of organization was observed in the control group. CONCLUSION: The castor oil polyurethane was biocompatible and did not cause inflammation. It may be considered an alternative to fill bone defects.

José Carlos Garcia de, Mendonça; Rafael, De Rossi; Celso Massaschi, Inouye; Diego Rodrigo Paulillo, Bazan; João Carlos Castro, Monteiro; Juliana Pedroso de, Mendonça.

2006-10-01

37

Ewing's sarcoma of the tarsal bone  

Energy Technology Data Exchange (ETDEWEB)

The Ewing's sarcoma comprises approximately less than 10 percent of malignant bone tumors and 5 percent of all bone tumors, occurs in almost all bones of the body, and presents a widely divergent roentgenographic manifestations. The tarsal bones are involved only 2 percent in the Ewing's sarcoma. Two cases experienced by authors and ten cases published in literatures of Ewing's sarcoma of the tarsal bone were analyzed retrospectively. The result were as follows: 1. Of the tarsal bones, the calcaneus was 7 cases, the talus 4 cases, cuneiform 1 case. 2. Female was affected more commonly than male, the ratio being 4 to 1 in the tarsal bones. 3. About sixty percent of total cases in the tarsal bones had evidence of diffuse sclerotic pattern. All the cases of the talus had evidence of diffuse sclerotic pattern. 4. The diseases to be considered in differential diagnosis are as follows: avascular necrosis, tuberculous osteomyelitis, osteosarcoma, and pyogenic osteomyelitis. 5. The diffuse sclerosis radiographically showed a close relation with dead bone resulting from avascular necrosis due to tumor infiltration histologically. Periosteal reactive new bone and osteoid deposition on the dead bone were also correlated with diffuse sclerosis. 6. Because it is difficult to differentiate sclerotic lesions in the tarsal bones by radiographic methods alone, all such lesions should be subject to biopsy as early as possible.

Kwon, Jung Hyeok; Kim, Yong Sun; Kim, Tae Hun; Park, In Kyu; Kim, Yong Joo; Kang, Duk Sik; Sohn, Kyung Rak [College of Medicine, Kyungpook National University, Daegu (Korea, Republic of)

1985-06-15

38

CT-guided once-through bilateral percutaneous needle puncturing sclerotic therapy for bilateral multiple renal cysts: preliminary results  

International Nuclear Information System (INIS)

Objective: To evaluate CT-guided once-through bilateral percutaneous needle puncturing, aspiration and injection of sclerotic agents (ethanol) in treating bilateral multiple renal cysts. Methods: CT-guided once-through bilateral percutaneous needle puncturing sclerotic therapy was performed in 19 patients with bilateral multiple renal cysts. First, under CT guidance the puncture points and puncture routs were decided, then, puncturing, aspiration, rinsing and ethanol injection of the cysts were taken place by turn. The clinical results were analyzed. Results: bilateral percutaneous needle puncturing sclerotic therapy was successfully completed in all 19 cases. The whole procedure was well tolerated by all patients. The mean operative time was 23 minutes with a range of 20-35 minutes. No severe complications occurred. Conclusion: With proficient manipulation, CT-guided bilateral percutaneous needle puncturing sclerotic therapy for bilateral multiple renal cysts can be smoothly carried out. The technique can reduced the number of sclerotherapy times, cut down the medical expenses and, therefore, get twofold results with half the effort. (authors)

39

Facing rim cavities fluctuation modes  

Science.gov (United States)

Cavity modes taking place in the rims of two opposite wheels are investigated through Lattice-Boltzmann CFD simulations. Based on previous observations carried out by the authors during the BANC-II/LAGOON landing gear aeroacoustic study, a resonance mode can take place in the volume between the wheels of a two-wheel landing gear, involving a coupling between shear-layer vortical fluctuations and acoustic modes resulting from the combination of round cavity modes and wheel-to-wheel transversal acoustic modes. As a result, side force fluctuations and tonal noise side radiation take place. A parametric study of the cavity mode properties is carried out in the present work by varying the distance between the wheels. Moreover, the effects due to the presence of the axle are investigated by removing the axle from the two-wheel assembly. The azimuthal properties of the modes are scrutinized by filtering the unsteady flow in narrow bands around the tonal frequencies and investigating the azimuthal structure of the filtered fluctuation modes. Estimation of the tone frequencies with an ad hoc proposed analytical formula confirms the observed modal properties of the filtered unsteady flow solutions. The present study constitutes a primary step in the description of facing rim cavity modes as a possible source of landing gear tonal noise.

Casalino, Damiano; Ribeiro, André F. P.; Fares, Ehab

2014-06-01

40

Imaging features of hemangioma in the long bone  

International Nuclear Information System (INIS)

Objective: To explore the imaging features of hemangioma in the long bone and improve the diagnostic level of this disease. Methods: The X-ray (14 cases), CT (9 cases) and MRI (6 cases) findings of 18 patients with histologically proven hemangioma in the long bone after surgery were retrospectively reviewed. Results: Ten tumors occurred in medullary cavity or bone end (medullary type), 6 on the surface of bone (periosteal type) and 3 in cortex (intracortical type). X-ray findings: among 8 cases of medullary type, 3 showed honeycomb appearance, 3 lytic areas with sclerotic borders, one purely osteolytic changes, and 1 frosted glass; 3 cases of periosteal type showed sclerosis and thickening of the underlying cortex; 3 cases of intracortical type showed well defined osteolytic foci. CT findings: among 6 cases of medullary type, 5 appeared as expansile lytic lesion with uneven selerotic rim (3 cases) orhoneycomb appearance (2 cases), 1 cribriform appearance in the cortical bone, 2 periostealnew bone formation in vertical radiation pattern; 1 ground-glass appearance; among 2 cases of periosteal type-one showed regular cortical thickening, and the other irregular periosteal proliferation with marrowing of medullarycavity; 1 case of intracortical type showed density similar to that of soft tissue, with cortical thickening and expansion. MRI findings: 2 appeared as well-defined lesions with low signal intensity on T1WI and high signal intensity on T2WI; 1 appeared as ill-defined lesion with low to intermediate signal intensity on T1WI and T2WI. One showed breakthrough of cortex and formation of soft, tissue mass with low signal intensity on T1WI and high signal on T2WI. Two showed thickening of periosteum with intermediate signal intensity in one of them and very low signal intensity in the other. Two showed abnormal signal intensity in surrounding muscles, which was high on T2WI and intermediate on T1WI. Conclusions: The soap-bubble or honeycomb appearance is the typical radiographic finding of hemangioma in long bone. CT and MRI can provide useful information for the diagnosis of hemangioma in long bone. (authors)

 
 
 
 
41

Antifibrotic effects of crocetin in scleroderma fibroblasts and in bleomycin-induced sclerotic mice  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english OBJECTIVE: To investigate the antifibrotic effects of crocetin in scleroderma fibroblasts and in sclerotic mice. METHODS: Skin fibroblasts that were isolated from three systemic scleroderma (SSc) patients and three healthy subjects were treated with crocetin (0.1, 1 or 10 ?M). Cell proliferation [...] was measured with an MTT assay. Alpha-smooth muscle actin was detected via an immunohistochemical method. Alpha 1 (I) procollagen (COL1A1), alpha 1 (III) procollagen (COL3A1), matrix metalloproteinase (MMP)-1 and tissue inhibitor of matrix metalloproteinase (TIMP)-1 mRNA levels were measured using real-time PCR. SSc mice were established by the subcutaneous injection of bleomycin. Crocetin (50 mg/kg/d) was injected intraperitoneally for 14 days. Dermal thickness and lung fibrosis were assessed with Masson's trichrome staining. Plasma ET-1 was detected with an enzyme-linked immunosorbent assay (ELISA). Skin and lung ET-1 and COL1A1 mRNA levels were measured via real-time PCR. RESULTS: Crocetin inhibited the proliferation of SSc and normal fibroblasts, an effect that increased with crocetin concentration and incubation time. Crocetin decreased the expression of ?-SMA and the levels of mRNA for COL1A1, COL3A1 and matrix metalloproteinase-1, while crocetin increased TIMP-1 mRNA levels in both SSc and normal fibroblasts. Skin and lung fibrosis was induced, and the levels of ET-1 in the plasma, skin and lungs were elevated in bleomycin-injected mice. Crocetin alleviated the thickening of the dermis and lung fibrosis; decreased COL1A1 mRNA levels in the skin and lung; and simultaneously decreased ET-1 concentrations in the plasma and ET-1 mRNA levels in the skin and lungs of the bleomycin-induced sclerotic mice, especially during the early phase (weeks 1-3). CONCLUSION: Crocetin inhibits cell proliferation, differentiation and collagen production in SSc fibroblasts. Crocetin alleviates skin and lung fibrosis in a bleomycin-induced SSc mouse model, in part due to a reduction in ET-1.

Yinghua, Song; Lubing, Zhu; Ming, Li.

1350-13-01

42

Antifibrotic effects of crocetin in scleroderma fibroblasts and in bleomycin-induced sclerotic mice  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english OBJECTIVE: To investigate the antifibrotic effects of crocetin in scleroderma fibroblasts and in sclerotic mice. METHODS: Skin fibroblasts that were isolated from three systemic scleroderma (SSc) patients and three healthy subjects were treated with crocetin (0.1, 1 or 10 ?M). Cell proliferation [...] was measured with an MTT assay. Alpha-smooth muscle actin was detected via an immunohistochemical method. Alpha 1 (I) procollagen (COL1A1), alpha 1 (III) procollagen (COL3A1), matrix metalloproteinase (MMP)-1 and tissue inhibitor of matrix metalloproteinase (TIMP)-1 mRNA levels were measured using real-time PCR. SSc mice were established by the subcutaneous injection of bleomycin. Crocetin (50 mg/kg/d) was injected intraperitoneally for 14 days. Dermal thickness and lung fibrosis were assessed with Masson's trichrome staining. Plasma ET-1 was detected with an enzyme-linked immunosorbent assay (ELISA). Skin and lung ET-1 and COL1A1 mRNA levels were measured via real-time PCR. RESULTS: Crocetin inhibited the proliferation of SSc and normal fibroblasts, an effect that increased with crocetin concentration and incubation time. Crocetin decreased the expression of ?-SMA and the levels of mRNA for COL1A1, COL3A1 and matrix metalloproteinase-1, while crocetin increased TIMP-1 mRNA levels in both SSc and normal fibroblasts. Skin and lung fibrosis was induced, and the levels of ET-1 in the plasma, skin and lungs were elevated in bleomycin-injected mice. Crocetin alleviated the thickening of the dermis and lung fibrosis; decreased COL1A1 mRNA levels in the skin and lung; and simultaneously decreased ET-1 concentrations in the plasma and ET-1 mRNA levels in the skin and lungs of the bleomycin-induced sclerotic mice, especially during the early phase (weeks 1-3). CONCLUSION: Crocetin inhibits cell proliferation, differentiation and collagen production in SSc fibroblasts. Crocetin alleviates skin and lung fibrosis in a bleomycin-induced SSc mouse model, in part due to a reduction in ET-1.

Yinghua, Song; Lubing, Zhu; Ming, Li.

43

The detection of sclerotic changes of the coronaries and heart valves by scanning beams (ultrafast computed tomography using EVOLUTION)  

International Nuclear Information System (INIS)

With the advent of ultrafast computed tomography the range of diagnostic procedures for the quantitative determination of pathological changes in the coronary arteries has been broadened. The calcified coronary plaques found in this study, which in some of the patients were markedly pronounced, gave no immediate clue as to what extent sclerotic changes had already occurred in the coronaries examined. Nor was it possible on the basis of this method to pinpoint the vascular sections showing calcified plaques in patients undergoing maintenance dialysis. It may, however, permit careful predictions to be made for patients at a high risk of developing coronary artery disease. Sclerotic changes of the heart values occur with above-average frequency in dialysis patients and may be assessed quantitatively by the method described. The results described show that findings revealed by scanning electron beams may provide indirect information on metabolic processes in patients suffering from chronic ailments. (orig./MG)

44

Modulation of renin angiotensin system predominantly alters sclerotic phenotype of glomeruli in HIVAN.  

Science.gov (United States)

HIV-associated nephropathy (HIVAN) is a common complication of HIV-1 infection in patients with African ancestry in general and with APOL1 gene risk variants in particular. Although collapsing glomerulopathy is considered a hallmark of HIVAN, significant numbers of glomeruli in patients with HIVAN also display other variants of focal segmental glomerulosclerosis (FSGS). We propose that collapsed glomeruli as well as glomeruli with other variants of FSGS are manifestations of HIVAN and their prevalence depends on associated host factors. We explored the role of the renin-angiotensin system (RAS) in the manifestation of any specific glomerular phenotype in HIVAN. To evaluate the role of the RAS we have used a genetically engineered mouse model of HIVAN (Tg26) with two and four copies of angiotensinogen (Agt) gene (Tg26/Agt2 and Tg26/Agt4). In Tg26/Agt2, 1 out of 6 glomeruli exhibited sclerosed phenotype, whereas 1 out of 25 glomeruli displayed collapsed phenotype; on the other hand, in Tg26/Agt4, 1 out of 3 glomeruli exhibited sclerotic phenotype and only 1 out of 7 glomeruli showed collapsed phenotype. To inhibit the effect of RAS, Tg26/Agt2 were administered captopril, aliskiren, aliskiren plus captopril or aliskiren plus telmisartan by miniosmotic pumps for 4 weeks. In all experimental groups there was a significant reduction in percentage of sclerosed glomeruli and only minimal reduction in collapsed glomeruli compared to normal saline receiving Tg26/Agt2. These findings suggest that the manifestation of the sclerosed phenotype in HIVAN is predominantly dependent on activation of the RAS. PMID:24892944

Plagov, Andrei; Lan, Xiqian; Rai, Partab; Kumar, Dileep; Lederman, Rivka; Rehman, Shabina; Malhotra, Ashwani; Ding, Guohua; Chander, Praveen N; Singhal, Pravin C

2014-12-01

45

Renal subcapsular rim sign. Radionuclide pattern  

International Nuclear Information System (INIS)

The renal cortical rim sign is a radiological term describing the thin peripheral nephrogram of 2-4 mm thick which is from the peri-renal capsular collateral circulation in an otherwise nonfunctioning kidney. Radionuclides are used frequently in the estimation of renal function. A neonate with renal vein thrombosis demonstrated a rim sign on renal scan with Technetium DTPA. The rim sign on renal scan can be differentiated from severe hydronephrosis or multicystic kidney both of which may have a peripheral thin cortex which functions late on the renal scan. The rim sign in renal vein thrombosis was best visualized during the early blood pool phase when there was a considerable amount of radioactivity in the blood pool

46

Rim sign: association with acute cholecystitis  

International Nuclear Information System (INIS)

In a retrospective analysis of 218 hepatobiliary studies in patients clinically suspected of acute cholecystitis, a rim of increased hepatic activity adjacent to the gallbladder fossa (the rim sign) has been evaluated as a scintigraphic predictor of confirmed acute cholecystitis. Of 28 cases with pathologic confirmation of acute cholecystitis in this series, 17 (60%) demonstrated this sign. When associated with nonvisualization of the gallbladder at 1 hr, the positive predictive value of this photon-intense rim for acute cholecystitis was 94%. When the rim sign was absent, the positive predictive value of nonvisualization of the gallbladder at 1 hr for acute cholecystitis was only 36%. As this sign was always seen during the first hour postinjection, it can, when associated with nonvisualization, reduce the time required for completion of an hepatobiliary examination in suspected acute cholecystitis

47

Association between the proportion of globally sclerotic glomeruli and various morphologic variables and clinical data of IgA nephropathy patients  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction: Immunoglobulin A nephropathy is the most common form of glomerular nephropathy among children and young adults.Objectives: To evaluate the possible correlation between the extent of sclerotic glomeruli and various morphologic variables and clinical data of IgA nephropathy (IgAN patients, we conducted an observational study, on 136 IgAN patients’ biopsies.Patients and Methods: Of the 136 patients, 94 (69.1% were male. The mean age of the patients was 37.6 ± 13.4 years. The mean of serum creatinine was 1.94±3.7 mg/dl (median=1.2mg/dl, also mean of proteinuria was 1726±1247 mg/day (median=1500 mg/day. In this study of 14.9±3.7 glomeruli in biopsies, 2.5±3.2 (median=2 were globally sclerotic.Results: In this study we found, significant positive correlation between proportion of globally sclerotic glomeruli and serum creatinine, amount of proteinuria, and also quantity of tubulointerstitial fibrosis. Also, in this study, the association of proportion of globally sclerotic glomeruli with M, E, S and T variables of Oxford classification was significantly positive.Conclusion: We propose firstly that, sclerotic glomeruli reported routinely in the pathology reports of IgA nephropathy patients and secondly we suggest further investigations to possible inclusion of other morphologic variables like proportion of sclerotic glomeruli to Oxford classification of IgAN to widen the scope of this classification.

Nasri Hamid

2012-12-01

48

Three-dimensional trabecular bone architecture of the lumbar spine in bone metastasis from prostate cancer: comparison with degenerative sclerosis  

Energy Technology Data Exchange (ETDEWEB)

Prostate cancer frequently metastasizes to bone, inducing osteosclerotic lesions. The objective of this study was to clarify the three-dimensional (3D) trabecular bone microstructure in bone metastasis from prostate cancer by comparison with normal and degenerative sclerotic bone lesions, using microcomputed tomography (micro-CT). A total of 32 cancellous bone samples were excised from the lumbar spine of six autopsy patients: 15 metastatic samples (one patient), eight degenerative sclerotic samples (four patients) and the rest from normal sites (three patients). The samples were serially scanned cross-sectionally by micro-CT with a pixel size of 23.20 {mu}m, slice thickness of 18.56 {mu}m, and image matrix of 512 x 512. Each image data set consisted of 250 consecutive slices. The volumes of interest (96 x 96 x 120 voxels) were defined in the original image sets and 3D indices of the trabecular microstructure were determined. The trabecular thickness (Tb.Th) in degenerative sclerotic lesions was significantly higher than that in normal sites, whereas no significant difference was observed in trabecular number (Tb.N). By contrast, in metastatic lesions, the Tb.N was significantly higher with increased bone volume fraction (BV/TV) than in normal sites, and no significant difference was found in Tb.Th. The characteristics of the trabecular surface in the metastatic samples showed concave structural elements with an increase in BV/TV, indicating osteolysis of the trabecular bone. In 3D reconstructed images, increased trabecular bone with an irregular surface was observed in samples from metastatic sites, which were uniformly sclerotic on soft X-ray radiographs. These results support, through 3D morphological features, the strong bone resorption effect in bone metastasis from prostate cancer. (orig.)

Tamada, Tsutomu; Sone, Teruki; Imai, Shigeki; Kajihara, Yasumasa; Fukunaga, Masao [Kawasaki Medical School, Department of Radiology, Kurashiki, Okayama (Japan); Jo, Yoshimasa [Kawasaki Medical School, Department of Urology, Kurashiki, Okayama (Japan)

2005-03-01

49

Three-dimensional trabecular bone architecture of the lumbar spine in bone metastasis from prostate cancer: comparison with degenerative sclerosis  

International Nuclear Information System (INIS)

Prostate cancer frequently metastasizes to bone, inducing osteosclerotic lesions. The objective of this study was to clarify the three-dimensional (3D) trabecular bone microstructure in bone metastasis from prostate cancer by comparison with normal and degenerative sclerotic bone lesions, using microcomputed tomography (micro-CT). A total of 32 cancellous bone samples were excised from the lumbar spine of six autopsy patients: 15 metastatic samples (one patient), eight degenerative sclerotic samples (four patients) and the rest from normal sites (three patients). The samples were serially scanned cross-sectionally by micro-CT with a pixel size of 23.20 ?m, slice thickness of 18.56 ?m, and image matrix of 512 x 512. Each image data set consisted of 250 consecutive slices. The volumes of interest (96 x 96 x 120 voxels) were defined in the original image sets and 3D indices of the trabecular microstructure were determined. The trabecular thickness (Tb.Th) in degenerative sclerotic lesions was significantly higher than that in normal sites, whereas no significant difference was observed in trabecular number (Tb.N). By contrast, in metastatic lesions, the Tb.N was significantly higher with increased bone volume fraction (BV/TV) than in normal sites, and no significant difference was found in Tb.Th. The characteristics of the trabecular surface in the metastatic samples showed concave structural elements with an increase in BV/TV, indicating osteolysis of the trabecular bone. In 3D reconstructed images, increased trabecular bone with an irregular surface was observed in samples from metastatic sites, which were uniformly sclerotic on soft X-ray radiographs. These results support, through 3D morphological features, the strong bone resorption effect in bone metastasis from prostate cancer. (orig.)

50

Imaging appearance of bone tumors of the maxillofacial region  

Directory of Open Access Journals (Sweden)

Full Text Available This paper reviews the imaging appearance of benign and malignant bone tumors of the maxillofacial region. A benign bone tumor commonly appears as a well circumscribed lesion. The matrix of the tumor may be calcified or sclerotic. Malignancies often display aggressive characteristics such as cortical breakthrough, bone destruction, a permeative pattern and associated soft-tissue masses. Computed tomography scan is an excellent imaging modality for accurate localization of the lesion, characterization of the tumor matrix and detection of associated osseous changes such as bone remodeling, destruction or periosteal reaction. Magnetic resonance imaging is of limited value in the evaluation of maxillofacial bone tumors.

Ahmed Abdel Khalek Abdel Razek

2011-01-01

51

The Role of Divided Injections of a Sclerotic Agent over Two Days in Balloon-Occluded Retrograde Transvenous Obliteration for Large Gastric Varices  

Science.gov (United States)

Objective To determine the safety and usefulness of a two-tiered approach to balloon-occluded retrograde transvenous obliteration (B-RTO) as a treatment for large gastric varices after portal hypertension. Materials and Methods 50 patients were studied who underwent B-RTO for gastric varices between October 2004 and October 2011 in our institution. The B-RTO procedure was performed from the right femoral vein and the B-RTO catheter was retained until the following morning. Distribution of sclerotic agents in the gastric varices on fluoroscopy was evaluated in all patients on days 1 and 2. When distribution of sclerotic agents in the gastric varices on day 1 had been none or very scanty even though the volume of the sclerotic agent infused was above the acceptable level, a second infusion was administered on day 2. When distribution was satisfactory, the B-RTO catheter was removed. Results In 8 (16%) patients, little or no sclerotic agent infused on day 1 was distributed in the gastric varices. However, on day 2, sclerotic agents were distributed in all gastric varices. Mean volume of ethanolamine oleate-iopamidol infused on day 1 was 24.6 mL and was 19.4 mL on day 2. Gastric varices were well obliterated with no recurrence. Complications caused by the sclerotic agent such as pulmonary edema or renal insufficiencies were not seen. Conclusion When gastric varices are very large, a strategy involving thrombosis of only the drainage vein on the first day followed by infusing the sclerotic agent on the following day might be effective and feasible. PMID:23690710

Yoshimatsu, Rika; Miura, Hiroshi; Matsumoto, Tomohiro; Hasebe, Terumitsu

2013-01-01

52

Ossicular bone modeling in acute otitis media  

DEFF Research Database (Denmark)

A number of middle ear diseases are associated with pathologic bone modeling, either formative or resorptive. As such, the pathogenesis of a sclerotic mastoid has been controversial for decades. Experimental studies on acute middle ear infection have shown progressive osteoneogenesis in the bone structures surrounding the middle ear cavity, and a few studies have reported acute changes of the ossicular chain. However, detailed qualitative and quantitative information on ossicular bone modeling dynamics has not been accounted for and is thus the purpose of this study.

Salomonsen, Rasmus Lysholdt; Hermansson, Ann

2010-01-01

53

Carcinoma medular do rim Renal medullary carcinoma  

Directory of Open Access Journals (Sweden)

Full Text Available É relatado caso de paciente de 24 anos, portador de traço falciforme, com imagem sólida no rim direito, submetido a nefrectomia radical que revelou tumor, cujo exame anatomopatológico permitiu o diagnóstico de carcinoma medular do rim. Os autores discutem aspectos dessa neoplasia, tais como freqüência, patogênese, apresentação clínica, histopatologia e evolução.We report the case of a 24-year-old patient who presented a left kidney tumor that was diagnosed as a medullary renal cell carcinoma. The following aspects of this neoplasia are discussed in this communication: frequency, pathogenesis, clinical presentation, histopathological findings, differential diagnosis and follow-up.

Paulo Guilherme de Oliveira Salles

2006-04-01

54

Rimmed and edge thickened Stodola shaped flywheel  

Science.gov (United States)

A flywheel (10) is described that is useful for energy storage in a hybrid vehicle automotive power system or in some stationary applications. The flywheel (10) has a body (15) composed of essentially planar isotropic high strength material. The flywheel (10) body (15) is enclosed by a rim (50) of circumferentially wound fiber (2) embedded in resin (3). The rim (50) promotes flywheel (10) safety and survivability. The flywheel (10) has a truncated and edge thickened Stodola shape designed to optimize system mass and energy storage capability.

Kulkarni, Satish V. (San Ramon, CA); Stone, Richard G. (Oakland, CA)

1983-01-01

55

North Rim of Endeavour Crater on Horizon  

Science.gov (United States)

[figure removed for brevity, see original site] A northern portion of the rim of Endeavour Crater is visible on the horizon of this image taken by the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity on March 7, 2009, during the 1,820st Martian day, or sol, of the rover's mission on Mars. That portion of Endeavour's rim is about 20 kilometers (12 miles) away from Opportunity's position west of the crater when the image was taken. The width of the image covers approximately one degree of the horizon.

2009-01-01

56

East Rim of Endeavour Crater on Horizon  

Science.gov (United States)

[figure removed for brevity, see original site] A high point on the distant eastern rim of Endeavour Crater is visible on the horizon in this image taken by the panoramic camera (Pancam) on NASA's Mars Exploration Rover Opportunity on March 8, 2009, during the 1,821st Martian day, or sol, of the rover's mission on Mars. That portion of Endeavour's rim is about 34 kilometers (21 miles) away from Opportunity's position west of the crater when the image was taken. The width of the image covers approximately one degree of the horizon.

2009-01-01

57

Aneurysmal bone cyst of the temporal bone  

International Nuclear Information System (INIS)

Aneurysmal bone cyst (ABC) of the temporal bone is rare. The nature of the underlying disorder that converted into the ABC might, however, be difficult to ascertain on imaging as well as on histopathology. The unusual CT and MRI findings in a case of ABC of the temporal bone are presented. This had transdural intracerebral spread with a large component of solid enhancing matrix but no peripheral calcific rim. The patient was an adult of 45 years with a history of headache for more than 1 year Copyright (2004) Blackwell Publishing Asia Pty Ltd

58

Radio observations of bright ionized rims  

International Nuclear Information System (INIS)

Radio images of ionized bright rim structures in NGC 2264, IC 1396, and S140 show discrete condensations which are not optically evident. These condensations may be the result of Rayleigh-Taylor instabilities at the interface between the ionized and neutral phases of the interstellar medium. 10 references

59

Chronic epidural haematoma with partial rim enhancement  

International Nuclear Information System (INIS)

A change in behavior was noted in a 40-year-old male. After 3 weeks a CT scan was performed and disclosed a parietal epidural lesion with partial rim enhancement. A chronic, clotted, epidural haematoma was removed by operation. (orig.)

60

Metastatic breast carcinoma to bone disguised by osteopoikilosis  

Energy Technology Data Exchange (ETDEWEB)

A case of metastatic lobular carcinoma of the breast in conjunction with osteopoikilosis is described. Widespread diffuse sclerotic bone lesions were identified on radiographs in a patient with breast carcinoma. In addition computed tomography demonstrated discrete spherical areas of increased density throughout the skeleton manifest typically by osteopoikilosis. No systemic symptoms were evident, blood parameters were normal and the lesions did not demonstrate any increased uptake of technetium on bone scan. An iliac crest bone biopsy, however, revealed metastatic disease in addition to osteopoikilosis. Conventional radiological investigations may not delineate metastasis on a background of bone dysplasia. (orig.)

Kennedy, J.G.; Donahue, J.R.; Hoang, B.H.; Morris, C. [Department of Orthopaedic Surgery, A342, Memorial Sloan Kettering Cancer Center, Affiliate of Weil Cornell Medical School, 1275 York Avenue, New York, NY 10021 (United States); Aydin, H.; Huvos, A. [Department of Pathology, Memorial Sloan Kettering Cancer Center, Affiliate of Weil Cornell Medical School, 1275 York Avenue, New York, NY 10021 (United States)

2003-04-01

 
 
 
 
61

Hallazgo de cuerpos escleróticos en un canino: sospecha de cromoblastomicosis cutánea Sclerotic bodies found in a dog: suspected cutaneous chromoblastomycosis  

Directory of Open Access Journals (Sweden)

Full Text Available Una paciente canina se presenta a consulta con prurito generalizado de curso crónico. El examen dermatológico evidencia lesiones alopécicas descamativas con hiperqueratosis en la cara interior caudal de ambos muslos. El examen microscópico directo de muestra de escamas cutáneas con KOH más tinta Quinck Parker evidencia la presencia de cuerpos escleróticos, elementos diagnósticos de cromoblastomicosis, una patología micótica muy infrecuente en Chile y previamente no reportada en cánidos. La terapia antimicótica tópica con peróxido de benzoílo consiguió la remisión clínica y micológica de las lesiones.A female canine patient presented a history of chronic generalized pruritus. In the dermatological examination, scaly alopecic lesions with hyperkeratosis were detected on the inner posterior face of both thighs. Microscopical examinations of skin scrapings showed the presence of sclerotic bodies, diagnostic elements of chromoblastomycosis, a mycotic infection rare in Chile and not previously described in dogs. Topical antifungal therapy with benzoyl peroxide resulted in clinical and mycological cure of lesions.

V Silva

2007-01-01

62

Managing oil logistics around the Baltic Rim  

International Nuclear Information System (INIS)

Finland's Neste Group is a major player in the oil business in the Baltic area. Neste tankers and petroleum product logistics services comprehensively serve the region. Neste's main Baltic Rim terminal outside Finland is located at Muuga close to the Estonian capital, Tallinn. This will be joined by one in Riga in Latvia at the end of this year. A terminal for St. Petersburg is in the planning stage

63

Crater Rim Path, Sol 1,215  

Science.gov (United States)

The route followed by NASA's Mars Exploration Rover Opportunity during its exploration partway around the rim of Victoria Crater is marked on this map. The rover first reached the edge of the crater on it's 951st Martian day, or sol (Sept. 26, 2006). This map shows travels through sol 1,215 (June 24, 2007). The underlying image is from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter.

2007-01-01

64

MRI evaluation of tibial tunnel wall cortical bone formation after platelet-rich plasma applied during anterior cruciate ligament reconstruction  

Science.gov (United States)

Background After anterior cruciate ligament (ACL) reconstruction, formation of cortical sclerotic bone encircling the femoral and tibial tunnel is a part of intratunnel graft healing. During the physiological cascades of soft tissue healing and bone growth, cellular and hormonal factors play an important role. The purpose of this study was to non-invasively but quantitatively assess the effect of intraoperatively applied platelet-rich plasma (PRP) on the formation of cortical bone encircling the tibial tunnel. Patients and methods In fifty patients, standard arthroscopic ACL reconstructions were performed. The PRP group (n = 25) received a local application of PRP while the control group (n = 25) did not receive PRP. The proximal tibial tunnel was examined by MRI in the paraxial plane where the portion of the tibial tunnel wall circumference consisting of sclerotic cortical bone was assessed with testing occurring at one, two and a half and six months after surgery. Results At one month after surgery, differences between the groups in the amount of cortical sclerotic bone encircling the tunnel were not significant (p = 0.928). At two and a half months, the sclerotic portion of the tunnel wall in the PRP group (36.2%) was significantly larger than in the control (22.5%) group (p = 0.004). At six months, the portion of sclerotic bone in the PRP group (67.1%) was also significantly larger than in the control (53.5%) group (p = 0.003). Conclusions Enhanced cortical bone formation encircling the tibial tunnel at 2.5 and 6 months after ACL graft reconstruction results from locally applied platelet-rich plasma. PMID:23801907

Rupreht, Mitja; Vogrin, Matjaz; Hussein, Mohsen

2013-01-01

65

Autosomal dominant type of endosteal hyperostosis with unusual manifestations of sclerosis of the jaw bones  

International Nuclear Information System (INIS)

We report three cases of autosomal dominant type endosteal hyperostosis which occurred in one Japanese family. A new pattern of sclerotic changes in the jaw bones is evident. In all members of the family there was a symmetrical thickening of the diaphyseal cortices of the long bones. The affected bones were only minimally widened and the epiphyses and metaphyses were spared. Endosteal sclerosis of the neurocranium was present with loss of the diploe. The sclerotic changes included enlargement and mottled sclerosis of both the maxilla and mandible, with multiple embedded teeth and odontomas. The ramus of the mandible was spared. Severe sclerosis of the jaw bones was present only in a 28-year-old women. The 2-year-son showed only focal sclerosis in the mandible, and his grandmother had minimal changes in the skeleton. (orig.)

66

Hallazgo de cuerpos escleróticos en un canino: sospecha de cromoblastomicosis cutánea / Sclerotic bodies found in a dog: suspected cutaneous chromoblastomycosis  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: Spanish Abstract in spanish Una paciente canina se presenta a consulta con prurito generalizado de curso crónico. El examen dermatológico evidencia lesiones alopécicas descamativas con hiperqueratosis en la cara interior caudal de ambos muslos. El examen microscópico directo de muestra de escamas cutáneas con KOH más tinta Qui [...] nck Parker evidencia la presencia de cuerpos escleróticos, elementos diagnósticos de cromoblastomicosis, una patología micótica muy infrecuente en Chile y previamente no reportada en cánidos. La terapia antimicótica tópica con peróxido de benzoílo consiguió la remisión clínica y micológica de las lesiones. Abstract in english A female canine patient presented a history of chronic generalized pruritus. In the dermatological examination, scaly alopecic lesions with hyperkeratosis were detected on the inner posterior face of both thighs. Microscopical examinations of skin scrapings showed the presence of sclerotic bodies, d [...] iagnostic elements of chromoblastomycosis, a mycotic infection rare in Chile and not previously described in dogs. Topical antifungal therapy with benzoyl peroxide resulted in clinical and mycological cure of lesions.

V, Silva; H, Madrid; S, Anticevic.

67

Incidence, Risk Factors, and Long-Term Outcomes of Sclerotic Graft-versus-Host Disease after Allogeneic Hematopoietic Cell Transplantation.  

Science.gov (United States)

Sclerotic chronic graft-versus-host disease (sclGVHD) is associated with significant morbidity and a poor quality of life. We reviewed 502 patients diagnosed with chronic GVHD and analyzed the incidence and risk factors of sclGVHD and long-term outcomes and immunosuppressive therapy (IST) cessation in patients with sclGVHD. With a median onset at 18 months the cumulative incidence of sclGVHD was estimated at 22.6% at 5 years (95% confidence interval, 18.6% to 26.8%). Univariate and multivariate analysis identified 2 risk factors for sclGVHD: non-T cell depletion (hazard ratio [HR] 9.09, P longer IST duration in the sclGVHD group compared with the non-sclGVHD group (median 71.6 months versus 62.9 months). In conclusion, T cell depletion and graft source affect the risk of sclGVHD. SclGVHD did not adversely affect long-term outcomes or IST duration. PMID:25042736

Uhm, Jieun; Hamad, Nada; Shin, Elizabeth M; Michelis, Fotios V; Shanavas, Mohamed; Gupta, Vikas; Kuruvilla, John; Lipton, Jeffrey H; Messner, Hans A; Seftel, Matthew; Kim, Dennis Dong Hwan

2014-11-01

68

Effect of the application time of phosphoric acid and self-etch adhesive systems to sclerotic dentin  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english Objective: To evaluate the effect of application time on the resin-dentin bond strength (µTBS) and etching pattern of adhesive systems applied on sclerotic dentine. Material and Methods: A total of forty-two bovine incisors had their roots removed. The 1-step self-etch GO (SDI), the 2-step self- [...] etch Adper SE Bond (3MESPE) and the 35% phosphoric acid (3MESPE) from the 2-step etch-and-rinse Adper Single Bond 2 (3MESPE) were applied on the bovine incisal surfaces according to the manufacturer's instructions or duplicating the recommended conditioning time. After adhesive application, thirty teeth were restored with composite resin, stored for 24 h in distilled water at 37°C, and sectioned into resin-dentin bonded sticks (0.8 mm 2 ) and tested according to the µTBS at 0.5 mm/min. The etching pattern of the remaining twelve teeth (n=4 for each material) was examined under scanning electron microscopy. Each tooth was divided into a buccal-to-lingual direction into three thirds, and each third randomly assigned to the groups: control (no treatment), according to the manufacturers' instructions and duplicating the recommended application time. The µTBS and the relative percentage of the tubule area opening were evaluated by two-way repeated measures ANOVA and Tukey's tests (?=0.05). Results: The duplication of the conditioning time favored only the GO adhesive (p

Alexandra Patricia, Mena-Serrano; Eugenio Jose, Garcia; Miguel Munoz, Perez; Gislaine Cristine, Martins; Rosa Helena Miranda, Grande; Alessandro Dourado, Loguercio; Alessandra, Reis.

2013-04-01

69

West Rim of Endeavour and a Farther Crater's Rim on Horizon  

Science.gov (United States)

[figure removed for brevity, see original site] In the left half of this view from the panoramic camera (Pancam) of NASA's Mars Exploration Rover Opportunity, a western portion of the rim of Endeavour Crater is visible on the horizon. In the right half, the rim of a smaller crater, farther away, appears faintly on the horizon. Opportunity's Pancam took this image on March 8, 2009, during the 1,821st Martian day, or sol, of the rover's mission on Mars. The width of the image covers approximately one degree of the horizon. The part of Endeavour's rim visible here is about 16 kilometers (10 miles) from where Opportunity was when the image was taken. The rover was at the same location as when its Pancam took images after a drive on Sol 1820. Opportunity remained at that location until a drive on Sol 1823. The more-distant rim to the right, part of Iazu Crater, is about 38 kilometers (24 miles) away. Iazu is south of Endeavour and about 7 kilometers (4 miles) in diameter.

2009-01-01

70

Genetic Relationships Between Chondrules, Rims and Matrix  

Science.gov (United States)

The most primitive chondrites are composed of chondrules and chondrule fragments, various types of inclusions, discrete mineral grains, metal, sulfides, and fine-grained materials that occur as interchondrule matrix and as chondrule/inclusion rims. Understanding how these components are related is essential for understanding how chondrites and their constituents formed and were processed in the solar nebula. For example, were the first generations of chondrules formed by melting of matrix or matrix precursors? Did chondrule formation result in appreciable transfer of chondrule material into the matrix? Here, we consider three types of data: 1) compositional data for bulk chondrites and matrix, 2) mineralogical and textural information, and 3) the abundances and characteristics of presolar materials that reside in the matrix and rims. We use these data to evaluate the roles of evaporation and condensation, chondrule formation, mixing of different nebular components, and secondary processing both in the nebula and on the parent bodies. Our goal is to identify the things that are reasonably well established and to point out the areas that need additional work.

Huss, G. R.; Alexander, C. M. OD.; Palme, H.; Bland, P. A.; Wasson, J. T.

2004-01-01

71

On the Rim of 'Victoria Crater'  

Science.gov (United States)

NASA's Mars rover Opportunity reached the rim of 'Victoria Crater' in Mars' Meridiani Planum region with a 26-meter (85-foot) drive during the rover's 951st Martian day, or sol (Sept. 26, 2006). After the drive, the rover's navigation camera took the three exposures combined into this view of the crater's interior. This crater has been the mission's long-term destination for the past 21 Earth months. A half mile in the distance one can see about 20 percent of the far side of the crater framed by the rocky cliffs in the foreground to the left and right of the image. The rim of the crater is composed of alternating promontories, rocky points towering approximately 70 meters (230 feet) above the crater floor, and recessed alcoves. The bottom of the crater is covered by sand that has been shaped into ripples by the Martian wind. The position at the end of the sol 951 drive is about six meters from the lip of an alcove called 'Duck Bay.' The rover team planned a drive for sol 952 that would move a few more meters forward, plus more imaging of the near and far walls of the crater. Victoria Crater is about five times wider than 'Endurance Crater,' which Opportunity spent six months examining in 2004, and about 40 times wider than 'Eagle Crater,' where Opportunity first landed. This view is presented as a cylindrical projection with geometric seam correction.

2006-01-01

72

Aquaporin-4 expression in distal myopathy with rimmed vacuoles  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Distal myopathy with rimmed vacuoles/hereditary inclusion body myopathy is clinically characterized by the early involvement of distal leg muscles. The striking pathological features of the myopathy are muscle fibers with rimmed vacuoles. To date, the role of aquaporin-4 water channel in distal myopathy with rimmed vacuoles/hereditary inclusion body myopathy has not been studied. Case presentation Here, we studied the expression of aquaporin-4 in muscle fibers of a patient with distal myopathy with rimmed vacuoles/hereditary inclusion body myopathy. Immunohistochemical and immunofluorescence analyses showed that sarcolemmal aquaporin-4 immunoreactivity was reduced in many muscle fibers of the patient. However, the intensity of aquaporin-4 staining was markedly increased at rimmed vacuoles or its surrounding areas and in some muscle fibers. The fast-twitch type 2 fibers were predominantly involved with the strong aquaporin-4-positive rimmed vacuoles and TAR-DNA-binding protein-43 aggregations. Rimmed vacuoles with strong aquaporin-4 expression seen in the distal myopathy with rimmed vacuoles/hereditary inclusion body myopathy patient were not found in control muscles without evidence of neuromuscular disorders and the other disease-controls. Conclusions Aquaporin-4 might be crucial in determining the survival or degeneration of fast-twitch type 2 fibers in distal myopathy with rimmed vacuoles/hereditary inclusion body myopathy.

Hoshi Akihiko

2012-04-01

73

Wheel rim stress detecting using ultrasonic testing technology  

Science.gov (United States)

Train wheels should undergo heat treatment, thus producing circumferential compressive force on the tread to void crack propagation, and this way eventually increases the train wheel service life, excluding situations like wheel burst due to crack. Hem shoes braking will lead to calorification and cooling of wheel rim,in this case stress state of wheel rim will would change under the influence of caloric and mechanical load, and compressive stress will turn to circumferential tensile force. For wheels in service, small flaws appear in the shallow layer of wheel tread, and will expand into depth. Consequently, detecting of wheel rim stress state should be attached more importance. Ultrasonic testing technology is an extremely important method for convenient, fast and non-destructive detecting in routine application of wheel sets. Verification of ultrasonic detecting method in detecting stress of wheel rim is given in this paper. On experimentation platform established with wheel rim stress detecting equipment and tensile stress mechanism, ultrasonic wheel rim stress detecting method is verified to be reliable and stable in the light of contrast between theoretical and experimental results. Basing on wheel rim stress measurement method using transverse straight probe, results are obtained by measuring test block and wheel rim stress, and ultrasonic wheel rim stress detecting method is approved to be feasible in application.

Guo, Jianqiang; Wang, Pei; Gao, Xiaorong; Wang, Zeyong; Zhao, Quanke

2013-01-01

74

On the Rim of 'Victoria Crater' (Stereo)  

Science.gov (United States)

[figure removed for brevity, see original site] Left-eye view of a stereo pair for PIA08780 [figure removed for brevity, see original site] Right-eye view of a stereo pair for PIA08780 NASA's Mars rover Opportunity reached the rim of 'Victoria Crater' in Mars' Meridiani Planum region with a 26-meter (85-foot) drive during the rover's 951st Martian day, or sol (Sept. 26, 2006). After the drive, the rover's navigation camera took the three exposures combined into this view of the crater's interior. This crater has been the mission's long-term destination for the past 21 Earth months. A half mile in the distance one can see about 20 percent of the far side of the crater framed by the rocky cliffs in the foreground to the left and right of the image. The rim of the crater is composed of alternating promontories, rocky points towering approximately 70 meters (230 feet) above the crater floor, and recessed alcoves. The bottom of the crater is covered by sand that has been shaped into ripples by the Martian wind. The position at the end of the sol 951 drive is about six meters from the lip of an alcove called 'Duck Bay.' The rover team planned a drive for sol 952 that would move a few more meters forward, plus more imaging of the near and far walls of the crater. Victoria Crater is about five times wider than 'Endurance Crater,' which Opportunity spent six months examining in 2004, and about 40 times wider than 'Eagle Crater,' where Opportunity first landed. This view is presented as a cylindrical-perspective projection with geometric seam correction.

2006-01-01

75

Effect of the application time of phosphoric acid and self-etch adhesive systems to sclerotic dentin  

Directory of Open Access Journals (Sweden)

Full Text Available Objective: To evaluate the effect of application time on the resin-dentin bond strength (µTBS and etching pattern of adhesive systems applied on sclerotic dentine. Material and Methods: A total of forty-two bovine incisors had their roots removed. The 1-step self-etch GO (SDI, the 2-step self-etch Adper SE Bond (3MESPE and the 35% phosphoric acid (3MESPE from the 2-step etch-and-rinse Adper Single Bond 2 (3MESPE were applied on the bovine incisal surfaces according to the manufacturer's instructions or duplicating the recommended conditioning time. After adhesive application, thirty teeth were restored with composite resin, stored for 24 h in distilled water at 37°C, and sectioned into resin-dentin bonded sticks (0.8 mm 2 and tested according to the µTBS at 0.5 mm/min. The etching pattern of the remaining twelve teeth (n=4 for each material was examined under scanning electron microscopy. Each tooth was divided into a buccal-to-lingual direction into three thirds, and each third randomly assigned to the groups: control (no treatment, according to the manufacturers' instructions and duplicating the recommended application time. The µTBS and the relative percentage of the tubule area opening were evaluated by two-way repeated measures ANOVA and Tukey's tests (?=0.05. Results: The duplication of the conditioning time favored only the GO adhesive (p<0.05. Both application methods significantly increased the tubule area opening (p<0.05 compared to the controls. Conclusions: The efficacy of duplicating the conditioning time was only effective for the 1-step self-etch adhesive system tested.

Alexandra Patricia Mena-Serrano

2013-04-01

76

Computerized phased array UT system for turbine disc rim inspection  

International Nuclear Information System (INIS)

Turbine disc rim cracking in the nuclear power plants has been a major reliability issue in recent years. This problem has led to increased interest in periodic nondestructive examination and the computerized inspection system using phased array probe called PADRIS (phased array disc rim inspection system) has been developed. It provides for rapid assessment of disk rim integrity without removing blades from the disc rim during a brief unit shutdown and in highly confined spaces. PADRIS has performed successfully during recent field trials at the nuclear power plants, and both the rapid inspection and the precise evaluation capability for the disc rim cracking was established. This paper summarizes the outline of the PADRIS system and the results of the field trial

77

Rim for rotary inertial energy storage device and method  

Science.gov (United States)

The present invention is directed to an improved rim or a high-performance rotary inertial energy storage device (flywheel). The improved rim is fabricated from resin impregnated filamentary material which is circumferentially wound in a side-by-side relationship to form a plurality of discretely and sequentially formed concentric layers of filamentary material that are bound together in a resin matrix. The improved rim is provided by prestressing the filamentary material in each successive layer to a prescribed tension loading in accordance with a predetermined schedule during the winding thereof and then curing the resin in each layer prior to forming the next layer for providing a prestress distribution within the rim to effect a self-equilibrating compressive prestress within the windings which counterbalances the transverse or radial tensile stresses generated during rotation of the rim for inhibiting deleterious delamination problems.

Knight, Jr., Charles E. (Knoxville, TN); Pollard, Roy E. (Powell, TN)

1980-01-01

78

Pattern of onychomycosis--a RIMS study.  

Science.gov (United States)

Onychomycosis is a fungal infection of nails caused by dermatophytes, yeasts or non-dermatophytes moulds. In this study, 500 patients suspected of having onychomycosis reffered from the out patient department (OPD), Dermatology, Regional Institute of Medical Sciences (RIMS) Hospital Imphal Manipur during the period from January 2007 to December 2008 were processed in the Department of Microbiology RIMS. Nail clippings or scrapings depending on the variety of onychomycosis were collected with sterile blades under all aseptic measures. Specimens were put up for 10% KOH mount, fungal cultures on two sets of SDA (Sabouraud's dextrose agar) incorporated with antibiotics and lactophenol cotton blue preparation (LCB) from the cultures and examined microscopically. Slide cultures were also put up if necessary. Out of 500 samples processed, a total of 444 (88.8%) were positive for the various fungi. The positive fungi were dermatophytes 258 (58.1%), non-dermatophytes 139 (31.3%), yeasts and yeast-like 17 (3.8%) and mixed fungal isolates 30 (6.7%). Of the 230 males and 270 females studied,193 (83.9%) males and 251 (92.9%) females respectively were positive for various fungi causing onychomycosis. Maximum number of suspected cases were in the age group of 21-30 years. Among the dermatophytes, Trichophyton species (spp.) 250 (50%) was the commonest isolate followed by Epidermophyton spp. 8 (1.6%). Among the non-dermatophytes, Aspergillus spp. 70 (14%) was the commonest followed by Penicillium spp. 24 (4.8%), Acremonium spp. 9 (1.8%), Fusarium spp. 8 (1.6%), Curvularia spp. 7 (1.4%), Alternaria spp. 5 (1%), Scopulariopsis spp. 4 (0.8%), Cladosporium spp. 4 (0.8%), Nigrospora spp. 2 (0.4%), Mucor spp. 1 (0.2%), Paecilomyces spp. 1 (0.2%), Pseudallescheria spp. (0.2%), Rhizopus spp. 1 (0.2%), Verticillium spp. 1 (0.2%), Exophiala jeanselmei 1 (0.2%). Among the yeast and yeast-like i.e. Candida spp. 15, Geotrichum spp. 1, Rhodotorula spp. 1 were 17 (3.8%), mixed fungal isolates 30 (6.7%), respectively. Reports were given to the patient for follow up and treatment. Health awareness and suggestions were given for prevention and further spread of onychomycosis. PMID:23785867

Pukhrambam, Pratita Devi; Devi, Kh Ranjana; Singh, Ng Brajachand

2011-06-01

79

30 CFR 56.19074 - Riding the bail, rim, bonnet, or crosshead.  

Science.gov (United States)

...2010-07-01 false Riding the bail, rim, bonnet, or crosshead. 56.19074 ...Procedures § 56.19074 Riding the bail, rim, bonnet, or crosshead. Persons shall not ride the bail, rim, bonnet, or crosshead of any shaft...

2010-07-01

80

30 CFR 57.19074 - Riding the bail, rim, bonnet, or crosshead.  

Science.gov (United States)

...2010-07-01 false Riding the bail, rim, bonnet, or crosshead. 57.19074 ...Procedures § 57.19074 Riding the bail, rim, bonnet, or crosshead. Persons shall not ride the bail, rim, bonnet, or crosshead of any shaft...

2010-07-01

 
 
 
 
81

Business Strategy Analysis of RIM in China's Smartphone Industry  

Digital Repository Infrastructure Vision for European Research (DRIVER)

China, the biggest mobile phone market in the world, is crucial for the future of Research In Motion (RIM). While RIM entered China’s market in 2006, its market share is still very small in China. The launch of 3G amid the restructuring of China’s telecom industry proved crucial to the company’s development. RIM has partnered with all mobile operators in China to provide BlackBerry Enterprise Service and BlackBerry Internet Service to both business and individual users. It has gained a ...

Chen, Lei

2011-01-01

82

Denonvilliers' advancement flap in congenital alar rim defects correction  

Directory of Open Access Journals (Sweden)

Full Text Available Background. Alar rim defects are mostly acquired, resulting from burns, traumas or tumor excision. Sometimes they can accompany craniofacial clefts. However, isolated congenital alar defects are extremely rare. Case report. We presented two cases of congenital isolated alar cleft. The defect was closed by the use of an advancement flap, the technique described by Denonvilliers. We achieved both symmetry and appropriate thickness of the nostrils. Skin color and texture of the alar rim were excellent, with scars not excessively visible. Conclusion. Denonvilliers' z-plasty technique by using advancement flap provides both functionally and aesthetically satisfying outcome in patients with congenital alar rim defects.

Novakovi? Marijan

2009-01-01

83

A Frosty Rim In False Color  

Science.gov (United States)

[figure removed for brevity, see original site] The theme for the weeks of 1/17 and 1/24 is the north polar region of Mars as seen in false color THEMIS images. Ice/frost will typically appear as bright blue in color; dust mantled ice will appear in tones of red/orange. Our final image combines the features of the past two days, with a dust covered frosty crater rim and the bluer sand dunes of the north polar region. Image information: VIS instrument. Latitude 70.1, Longitude 351.8 East (8.2 West). 40 meter/pixel resolution. Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time. NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.

2005-01-01

84

Rimmed and edge thickened stodola shaped flywheel. [Patent application  

Science.gov (United States)

A flywheel is described that is useful for energy storage in a hybrid vehicle automotive power system or in some stationary applications. The flywheel has a body composed of essentially planar isotropic high strength material. The flywheel body is enclosed by a rim of circumferentially wound fiber embedded in resin. The rim promotes flywheel safety and survivability. The flywheel has a truncated and edge thickened Stodola shape designed to optimize system mass and energy storage capability.

Kulkarni, S.V.; Stone, R.G.

1980-09-24

85

RIM as an implementation tool for a distributed heterogeneous database  

Science.gov (United States)

The another distributed database system (ADDS) prototype supports interactive, d hoc retrieval from several of the Amoco/Standard DHDBMS. The ADDS conceptual design, the usage of RIM in several components of ADDS, and some enhancements ot RIM that were used by the developers of the ADDS prototype are outlined. Topics covered include: (1) ADDS Overview; (2) composite database dictionary/directory; (3) user interface and user profiles; (4) subrequest execution; (5) merger/formatter; and (6) a transportable implamentation.

Breitbart, Y. J.; Hartweg, L. R.

1984-01-01

86

Rim region growth and its composition in reaction bonded boron carbide composites with core-rim structure  

International Nuclear Information System (INIS)

Aluminum was detected in reaction-bonded boron carbide that had been prepared by pressureless infiltration of boron carbide preforms with molten silicon in a graphite furnace under vacuum. The presence of Al2O3 in the heated zone, even though not in contact with the boron carbide preform, stands behind the presence of aluminium in the rim region that interconnects the initial boron carbide particles. The composition of the rim corresponds to the Bx(C,Si,Al)y quaternary carbide phase. The reaction of alumina with graphite and the formation of a gaseous aluminum suboxide (Al2O) accounts for the transfer of aluminum in the melt and, subsequently in the rim regions. The presence of Al increases the solubility of boron in liquid silicon, but with increasing aluminum content the activity of boron decreases. These features dominate the structural evolution of the rim-core in the presence of aluminum in the melt.

87

Bone scintigraphy, radiography and MRI in the diagnosis and evaluation of treatment response of calcaneal tuberculosis  

International Nuclear Information System (INIS)

Aim: We describe the role of various imaging modalities in the diagnosis and follow up of calcaneal tuberculosis. Materials and methods: Six patients (5 males, 1 female; age range 16-49 years) presented with heel pain. All patients underwent routine laboratory and radiological investigations e.g. radiographs, MRI and skeletal scintigraphy as part of initial diagnostic work-up. In all patients the diagnosis of tuberculosis was confirmed based on histopathology or culture. Standard multi-drug anti-tubercular therapy (ATT) was administered for 15 months. All patients were subsequently followed up with clinical evaluation, laboratory investigations and imaging. Skeletal scintigraphy, MRI and radiographs were repeated at 12 to 15 months from the initiation of anti-tubercular treatment in all patients. Results: Five out of six patients had lytic lesions at presentation on radiographs. Four of these 5 patients also had surrounding sclerosis. Follow-up radiographs obtained 12-15 months after starting ATT, showed an increase in surrounding sclerosis with progressive reduction in area of osteopenia in four and mild sclerotic changes in one. In the remaining one patient radiograph were normal both at presentation and follow up. Three phase bone scintigraphy revealed increased blood flow and blood pool activity and 'hot spots' in 5 and a central photopenic area in the calcaneum in one patient at the time of diagnosis. After starting ATT, significant reduction in vascularity and rsignificant reduction in vascularity and reactive bone changes in 5 patients and mild improvement in one patient. MRI was done in three patients, which revealed hyperintense lesion with erosion of the superior articular surface in 2 and 'Bull's eye' lesion with a hypointense centre and a surrounding hyperintense rim on post contrast T1W images in one patient. Follow-up MRI showed intermediate signal intensity on T2 weighted images that corresponded to caseous necrosis and high signal intensity related to granulomas or effusion. Conclusion: Radiography alone may not always reveal the presence of disease or its activity in calcaneal tuberculosis. Skeletal scintigraphy has a promising role in the early detection of calcaneal tuberculosis, and in the subsequent follow-up. It also offers the added advantage of whole body screening to detect multiple foci. MRI seems to offer similar sensitivity and better specificity in the diagnosis and follow-up compared to skeletal scintigraphy. MRI also offers better characterization of tubercular lesions

88

Bone tumor  

Science.gov (United States)

Tumor - bone; Bone cancer; Primary bone tumor; Secondary bone tumor ... The cause of bone tumors is unknown. They often occur in areas of the bone that grow rapidly. Possible causes include: Genetic defects ...

89

Does rim microstructure formation degrade the fuel rod performance?  

International Nuclear Information System (INIS)

High burnup extension of LWR fuel is progressing to reduce the total process flow and eventually the costs of the nuclear fuel cycle. A particular fuel restructuring at high burnups, commonly observed at the periphery of LWR fuel pellets (rim structure), but also in FBR fuels to some extent and in the Plutonium rich clusters of the MOX Fuels, was considered a priori as a limitation for burnup extension. Since more than ten years this rim effect have been deeply investigated. Its causes and consequences are however not yet totally elucidated. The three steps actually identified of this phenomenon are first a progressive disappearing of the intra-granular Xenon, the outset of numerous 0.5 to 1 m pores and finally a grain subdivision around the pores. Penalty of the porosity increase on the thermal conductivity is obvious. One expect the fission gases to remain trapped in the rim porosity up to a 75 MWd/kgUO2 local burnup. Above this threshold, 15 to 20 % of the fission gases seem to be quickly released. Microindentation tests conducted at ITU have shown the rim structure to resist fracture extension under punching. It is still open whether this implies certain ductility and viscosity of the material, or if it corresponds to stress relaxation by microcracking. Whatever the case be, it is suggested that the rim material would be able to decrease the interaction stresses and to equalise the cladding strains during a power ramp. Moreover, in the RIA tests, it was concluded so far that the grain de-cohesion caused by gas expansion at the grain boundaries was responsible for the cladding strain and failure. However, not the rim zone was affected by grain de-cohesion but the region adjacent to it. Therefore, in front of the question whether the rim structure degrades the fuel rod behaviour, we continue to argue on its benefit for fuel burnup extension. (author)

90

The natural history of disappearing bone tumours and tumour-like conditions  

Energy Technology Data Exchange (ETDEWEB)

We describe 27 cases of bone tumours or tumour-like lesions where there was spontaneous regression. The follow-up period was 2.8-16.7 years (average, 7.0 years). Fourteen of these cases were no longer visible on plain radiographs. Histological diagnosis included exostosis, eosinophilic granuloma, fibrous dysplasia, fibrous cortical defect, non-ossifying fibroma, osteoid osteoma and bone island. Most cases began to reduce in adolescence or earlier, although sclerotic type lesions showed their regression in older patients. All lesions thought to be eosinophilic granuloma began to regress after periods of less than 3 months, while the duration of the other lesions showed wide variation (1-74 months). As resolution of the lesions took between 2 and 79 months (mean, 25.0 {+-} 20.3 months) we consider that the most likely mechanism was recovery of normal skeletal growth control. In exostosis with fracture, alteration of vascular supply may contribute to growth arrest, but not to subsequent remodelling stage. In inflammatory-related lesions such as eosinophilic granuloma, cessation of inflammation may be the mechanism of growth arrest, whilst temporary inflammation may stimulate osteogenic cells engaged in remodeling. In the sclerotic type, growth arrest is a less probable mechanism. Necrosis within the tumour and/or local changes in hormonal control, plus remodelling of the sclerotic area takes longer. Knowledge of the potential for spontaneous resolution may help in management of these tumour and tumour-like lesions of bone. Yanagawa, T. et al. (2001)

Yanagawa, Takashi; Watanabe, Hideomi; Shinozaki, Tetsuya; Ahmed, Adel Refaat; Shirakura, Kenji; Takagishi, Kenji

2001-11-01

91

Aqueous Alteration of Endeavour Crater Rim Apron Rocks  

Science.gov (United States)

Mars Exploration Rover Opportunity is exploring Noachian age rocks of the rim of 22 km diameter Endeavour crater. Overlying the pre-impact lithologies and rim breccias is a thin apron of fine-grained sediments, the Grasberg fm, forming annuli on the lower slopes of rim segments. Hesperian Burns fm sandstones overly the Grasberg fm. Grasberg rocks have major element compositions that are distinct from Burns fm sandstones, especially when comparing interior compositions exposed by the Rock Abrasion Tool. Grasberg rocks are also different from Endeavour rim breccias, but have general compositional similarities to them. Grasberg sediments are plausibly fine-grained materials derived from the impact breccias. Veins of CaSO4 transect Grasberg fm rocks demonstrating post-formation aqueous alteration. Minor/trace elements show variations consistent with mobilization by aqueous fluids. Grasberg fm rocks have low Mn and high Fe/Mn ratios compared to the other lithologies. Manganese likely was mobilized and removed from the Grasberg host rock by redox reactions. We posit that Fe2+ from acidic solutions associated with formation of the Burns sulfate-rich sandstones acted as an electron donor to reduce more oxidized Mn to Mn2+. The Fe contents of Grasberg rocks are slightly higher than in other rocks suggesting precipitation of Fe phases in Grasberg materials. Pancam spectra show that Grasberg rocks have a higher fraction of ferric oxide minerals than other Endeavour rim rocks. Solutions transported Mn2+ into the Endeavour rim materials and oxidized and/or precipitated it in them. Grasberg has higher contents of the mobile elements K, Zn, Cl, and Br compared to the rim materials. Similar enrichments of mobile elements were measured by the Spirit APXS on West Spur and around Home Plate in Gusev crater. Enhancements in these elements are attributed to interactions of hydrothermal acidic fluids with the host rocks. Interactions of fluids with the Grasberg fm postdate the genesis of the Endeavour rim phyllosilicates. The aqueous alteration history of Endeavour rim rocks is complicated by different styles of alteration that have spanned the Noachian and Hesperian. Late stage acidic aqueous alteration of Grasberg fm materials is likely penecontemporaneous with the diagenesis of the sulfate-rich sediments of Meridiani Planum.

Mittlefehldt, David W.; Ming, Douglas W.; Gellert, Ralf; Clark, Benton C.; Morris, Richard V.; Yen, Albert S.; Arvidson, Raymond E.; Crumpler, Larry S.; Farrand, William H.; Grant, John A.; Jolliff, Bradley L.; Parker, Timothy J.; Peretyazhko, Tanya

2014-01-01

92

Parosteal osteoma of the iliac bone  

Energy Technology Data Exchange (ETDEWEB)

A 33-year-old patient with a 2-year history of intermittent pain in the right gluteal region and thigh presented with a large sclerotic lesion of the iliac bone. From the findings on radiography, scintigraphy, CT and MRI, a giant parosteal osteoma was suspected. The histological examination confirmed the diagnosis. Since the lesion was extensive it was observed with periodic follow-up examinations. At present, 5 years after the diagnosis, the patient is asymptomatic and imaging studies show that the lesion persists with reduction of sclerosis and size. The tumor was on the surface as well as intramedullary - only one other case with such a distribution is known to us - and it was also in the iliac bone. (orig.) With 7 figs., 14 refs.

Soler, R.R.; Martinez, S.; Granados, J. [Department of Rheumatology, Hospital Mutua de Terrassa, Barcelona (Spain); de Marcos, J.A. [Department of Radiology, Hospital Mutua de Terrassa, Barcelona (Spain); Salas, A. [Department of Pathology, Hospital Mutua de Terrassa, Barcelona (Spain); Lluc, P. [Primary Care Setting, Sa Canal Salat, Menorca (Spain)

1998-03-01

93

Histologia e ultraestrutura do rim e rim cefálico do pacu / Histology and ultrastructure of kidney and cephalic kidney in Pacu  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese O pacu, Piaractus mesopotamicus, é um teleósteo da Família Characidae, intensivamente cultivado no Brasil devido sua rusticidade, crescimento rápido e fácil adaptação. O conhecimento morfológico dos sistemas corpóreos, incluído órgãos linfóide, se faz necessário, para uma melhor produção no cultivo [...] de peixes, fornecendo subsídios na manutenção dos estoques. O objetivo deste estudo foi descrever morfologicamente o rim e rim cefálico de Piaractus mesopotamicus, analisando os perfis celulares de cada órgão com o uso de microscopia de luz e microscopia eletrônica de transmissão. O resultado da análise macroscópica mostrou que a localização do rim e rim cefálico são as mesmas encontradas na maioria dos teleósteos. O rim apresentou uma forma em "H", onde a região média se expandia sobre a bexiga natatória. O rim cefálico se apresentou como uma dilatação na região cranial do rim, mostrando-se bem visível. Na microscopia eletrônica de transmissão também foram observadas similaridades ultraestruturais com outros teleósteos. Observando nossos resultados concluímos que histologicamente e ultraestruturalmente, os órgãos linfóides rim e rim cefálico de Piaractus mesopotamicus são similares aos de outros teleósteos. Abstract in english The Pacu, Piaractus mesopotamicus, is a teleostei of the Characidae family, intensively cultivated in Brazil due to its rusticity, fast growth and easy adaptation. Morphological knowledge of the body systems including the lymphoid organs is necessary to improve fish production and supply subsidies f [...] or the maintenance of stocks. This study aimed to describe morphologically kidney and head kidney of Piaractus mesopotamicus, analyzing the cellular profile of each organ with the use of light microscopy and electronic transmission microscopy. The result of the macroscopic analysis showed that the localization of the kidney and head kidney is the same as found in the majority of the teleostei. The kidney presented a form in "H", where the medium region is expanded on the natatorium bladder. The head kidney presented a dilatation in the cranial region of the kidney. In the transmission electronic microscopy we found ultrastructural similarities with other teleostei fish. It can be concluded that the lymphoid organs (kidney and head kidney) of Piaractus mesopotamicus are histologically and ultra-structurally similar to the other teleostei.

Gerlane M., Costa; Ana R., Lima; Mendelson G. de, Lima; José R, Kfoury Jr.

94

Histologia e ultraestrutura do rim e rim cefálico do pacu Histology and ultrastructure of kidney and cephalic kidney in Pacu  

Directory of Open Access Journals (Sweden)

Full Text Available O pacu, Piaractus mesopotamicus, é um teleósteo da Família Characidae, intensivamente cultivado no Brasil devido sua rusticidade, crescimento rápido e fácil adaptação. O conhecimento morfológico dos sistemas corpóreos, incluído órgãos linfóide, se faz necessário, para uma melhor produção no cultivo de peixes, fornecendo subsídios na manutenção dos estoques. O objetivo deste estudo foi descrever morfologicamente o rim e rim cefálico de Piaractus mesopotamicus, analisando os perfis celulares de cada órgão com o uso de microscopia de luz e microscopia eletrônica de transmissão. O resultado da análise macroscópica mostrou que a localização do rim e rim cefálico são as mesmas encontradas na maioria dos teleósteos. O rim apresentou uma forma em "H", onde a região média se expandia sobre a bexiga natatória. O rim cefálico se apresentou como uma dilatação na região cranial do rim, mostrando-se bem visível. Na microscopia eletrônica de transmissão também foram observadas similaridades ultraestruturais com outros teleósteos. Observando nossos resultados concluímos que histologicamente e ultraestruturalmente, os órgãos linfóides rim e rim cefálico de Piaractus mesopotamicus são similares aos de outros teleósteos.The Pacu, Piaractus mesopotamicus, is a teleostei of the Characidae family, intensively cultivated in Brazil due to its rusticity, fast growth and easy adaptation. Morphological knowledge of the body systems including the lymphoid organs is necessary to improve fish production and supply subsidies for the maintenance of stocks. This study aimed to describe morphologically kidney and head kidney of Piaractus mesopotamicus, analyzing the cellular profile of each organ with the use of light microscopy and electronic transmission microscopy. The result of the macroscopic analysis showed that the localization of the kidney and head kidney is the same as found in the majority of the teleostei. The kidney presented a form in "H", where the medium region is expanded on the natatorium bladder. The head kidney presented a dilatation in the cranial region of the kidney. In the transmission electronic microscopy we found ultrastructural similarities with other teleostei fish. It can be concluded that the lymphoid organs (kidney and head kidney of Piaractus mesopotamicus are histologically and ultra-structurally similar to the other teleostei.

Gerlane M. Costa

2012-05-01

95

Analytical capabilities of RIMS: absolute sensitivity and isotopic analysis  

International Nuclear Information System (INIS)

Resonance ionization mass spectrometry (RIMS) with thermal filament sources is becoming an established analytical technique. The results of recent isotope ratio measurements carried out on small (60 - 200ng) lutetium samples are presented. The sensitivity and selectivity of continuous wave (CW) laser RIMS allow the accurate determination of very large ratios (approx. 106) in real samples containing numerous isobaric interferences. In addition, high resolution optical spectra of lutetium isotopes have been generated using RIMS as a prelude to isotopically selective resonance ionization. Also, the results of two-color spectroscopic studies for isotope ratio measurements in technetium are presented. A large number of multiply-resonant sequences have been explored; however, the presence of Tc molecular species appears to limit the potential sensitivity of the measurement. (author)

96

Observations of neutral carbon in the NGC 1977 bright rim  

International Nuclear Information System (INIS)

Strong neutral carbon emission at 610 ?m (429 GHz) has been detected from a bright-rimmed cloud abutting and H II region NGC 1977. The similarity of velocity and width between 13CO and C I lines suggests both lines originate in the same region. A model for the density and temperature structure of the cloud, based on 13CO and 12CO observations, has been used to estimate the carbon abundance. the abundances of both C I and 13CO increase with depth into the cloud away from the rim. The carbon abundance reaches its peak value nearer the rim than does the 13CO abundance. This variation in the relative abundance distributions of CO and C I confirms the importance of photodissociation in the chemistry of molecular clouds, and the C I line to studies of the interaction of hot stars with clouds

97

Experimental study of a TAHGEM detector with mini-rims  

International Nuclear Information System (INIS)

The gas gain and energy resolution of single and double THGEM detectors (5 cm × 5 cm effective area) with mini-rims (rim less than 10 ?m) were studied. The maximum gain was found to reach 5 × 103 and 2 × 105 for single and double THGEMs respectively, while the energy resolution for 5.9 keV X-rays varied from 18% to 28% for both single and double THGEM detectors of different hole sizes and thicknesses. Different combinations were also investigated of noble gases (argon, neon) mixed with a quantity of other gases (isobutane, methane) at atmospheric pressure. (authors)

98

Experimental study of THGEM detector with mini-rim  

CERN Document Server

The gas gain and energy resolution of single and double THGEM detectors (5{\\times}5cm2 effective area) with mini-rims (rim is less than 10{\\mu}m) were studied. The maximum gain can reach 5{\\times}103 and 2{\\times}105 for single and double THGEM respectively, while the energy resolution of 5.9 keV X-ray varied from 18% to 28% for both single and double THGEM detectors of different hole sizes and thicknesses.All the experiments were investigated in mixture of noble gases(argon,neon) and small content of other gases(iso-butane,methane) at atmospheric pressure.

Zhang, Ai-Wu; Xie, Yu-Guang; Liu, Hong-Bang; An, Zheng-Hua; Wang, Zhi-Gang; Cai, Xiao; Sun, Xi-Lei; Shi, Feng; Fang, Jian; Xue, Zhen; Lu, Qi-Wen; Sun, Li-Jun; Ge, Yong-Shuai; Liu, Ying-Biao; Hu, Tao; Zhou, Li; Lu, Jun-Guang

2011-01-01

99

Bone grafting with platelet-rich plasma in alveolar cleft. Case report.  

Science.gov (United States)

Bone grafting of the alveolus has become an essential part of the contemporary surgical management of oral clefts. The benefits of this procedure are the stabilization of the maxillary arch, elimination of oronasal fistulae, the reconstruction of the soft tissue nasal base support, creation of bony support for subsequent tooth eruption or, when they are not present or not preserved, for implants application. The authors show a case of bone grafting with the aid of platelet-rich plasma (PRP). Because of the difficulties due to the oral cleft and to its surgical reparation (big size of bone defect, hard scars and sclerotic soft tissue) the authors decided to add PRP to a bone graft taken from the chin. PRP contains a high concentration of growth factors and is able to stimulate both wound and bone regeneration. Infact, the authors have observed very good results both in bone integration and in soft tissue reparation. PMID:17287708

Rullo, R; Festa, V M; Guida, L; Laino, G

2007-01-01

100

Posterior glenoid rim deficiency in recurrent (atraumatic) posterior shoulder instability  

Energy Technology Data Exchange (ETDEWEB)

Objective. To assess the shape of the posterior glenoid rim in patients with recurrent (atraumatic) posterior instability.Design and patients. CT examinations of 15 shoulders with recurrent (atraumatic) posterior instability were reviewed in masked fashion with regard to abnormalities of the glenoid shape, specifically of its posterior rim. The glenoid version was also assessed. The findings were compared with the findings in 15 shoulders with recurrent anterior shoulder instability and 15 shoulders without instability. For all patients, surgical correlation was available.Results. Fourteen of the 15 (93%) shoulders with recurrent (atraumatic) posterior shoulder instability had a deficiency of the posteroinferior glenoid rim. In patients with recurrent anterior instability or stable shoulders such deficiencies were less common (60% and 73%, respectively). The craniocaudal length of the deficiencies was largest in patients with posterior instability. When a posteroinferior deficiency with a craniocaudal length of 12 mm or more was defined as abnormal, sensitivity and specificity for diagnosing recurrent (atraumatic) posterior instability were 86.7% and 83.3%, respectively. There was a statistically significant difference in glenoid version between shoulders with posterior instability and stable shoulders (P=0.01).Conclusion. Recurrent (atraumatic) posterior shoulder instability should be considered in patients with a bony deficiency of the posteroinferior glenoid rim with a craniocaudal length of more than 12 mm. (orig.)

Weishaupt, D.; Zanetti, M.; Hodler, J. [Dept. of Radiology, University Hospital Balgrist, Zurich (Switzerland); Nyffeler, R.W.; Gerber, C. [Dept. of Orthopedic Surgery, University Hospital Balgrist, Zurich (Switzerland)

2000-04-01

 
 
 
 
101

Parent to Parent Peer Support across the Pacific Rim  

Science.gov (United States)

In Pacific Rim countries parents of children with developmental disabilities have organized peer support organizations. One form of peer support is Parent to Parent based on one to one connections between two parents. The movements to create and sustain peer support in the U.S., New Zealand, China, and Korea are described. Qualitative evidence…

Singer, George H. S.; Hornby, Garry; Park, Jiyeon; Wang, Mian; Xu, Jiacheng

2012-01-01

102

Children's and Adolescent Literature from the Pacific Rim.  

Science.gov (United States)

Noting that literature written for children and adolescents can help students gain an understanding of the Pacific Rim area and its people, this paper presents advice on selecting appropriate literature, a children's literature bibliography, and an adolescent literature bibliography. The paper notes that to select appropriate literature, a teacher…

Spiegel, Lisa A.; Richardson, Maurine

103

Ultrasensitive analysis of thorium by resonance ionization mass spectroscopy (RIMS)  

International Nuclear Information System (INIS)

This communication presents results on a RIMS analysis of thorium. Thorium is of interest for geochronological and geochemical purposes. The measurement of uranium series disequilibrium is a well established and valuable approach for geochronological studies: disequilibrium between 234/238U and 230Th can be used to date samples younger than 350,000 years. Both continuous wave (cw) and pulsed lasers were utilized in this study for resonantly exciting and subsequently ionizing thorium. In the case of the pulsed laser RIMS experiments, two excimer laser-pumped dye lasers were used in conjunction with a 0.4 m time-of-flight mass spectrometer. The cw RIMS experiments used an Ar+ laser-pumped dye laser and a second Ar+ in combination with a single magnetic sector mass spectrometer (NBS 12-90 design). Experiments performed with the pulsed RIMS apparatus were aimed at determining the autoionization state structure and re-determining the ionization potential (IP). By tuning one dye laser to a resonance and scanning the second laser such that the total energy was equal to or above the IP, over 150 autoionization states were determined. The IP was re-determined to be 6.211±.002 eV (50900 ± 20 cm-1). In addition, the typical cross section for ionization of an autoionizing state was determined to be 1 x 10-15 cm2

104

16 CFR Figure 8 to Part 1512 - Reflectorized Bicycle Wheel Rim Abrasion Test Device  

Science.gov (United States)

...2010-01-01 2010-01-01 false Reflectorized Bicycle Wheel Rim Abrasion Test Device 8 Figure 8 to Part 1512 Commercial...Fig. 8 Figure 8 to Part 1512—Reflectorized Bicycle Wheel Rim Abrasion Test Device...

2010-01-01

105

49 CFR 238.119 - Rim-stamped straight-plate wheels.  

Science.gov (United States)

...2010-10-01 2010-10-01 false Rim-stamped straight-plate wheels. 238...and General Requirements § 238.119 Rim-stamped straight-plate wheels...than a private car, that is equipped with a rim-stamped straight-plate wheel if a...

2010-10-01

106

29 CFR 1910.177 - Servicing multi-piece and single piece rim wheels.  

Science.gov (United States)

...Servicing multi-piece and single piece rim wheels. 1910.177 Section 1910.177...Servicing multi-piece and single piece rim wheels. (a) Scope. (1) This...servicing of multi-piece and single piece rim wheels used on large vehicles such...

2010-07-01

107

Interesting bone scans - unusual findings  

International Nuclear Information System (INIS)

A 59-year-old female with carcinoma of the colon and known liver metastatic disease was referred for bone scan to evaluate for bone metastases. Although no bone metastases were found, there was abnormal uptake noted in the liver corresponding to a metastatic calcified lesion. The only other findings were of degenerative disease in the cervical spine, right shoulder and small joints of the hands. A 69-year-old male with carcinoma of the prostate and right side low back pain was referred for bone scan. No focal abnormalities to suggest metastatic disease were identified; findings within the cervical spine, lumber spine and knees were presumed secondary to degenerative disease. Intermittent pain persisted and the patient was referred for a repeat bone scan six months later. Previous scan findings of degenerative disease and no metastatic disease were confirmed; however, closer inspection revealed an enlarged right kidney with significant retention of tracer in the pelvicalyceal system suggesting possible obstruction. A Retrograde pyelogram was performed, and no obvious obstruction demonstrated. As bone scan findings were very suggestive of obstruction, a DTPA scan with lasix was performed showing a dilated right collecting system with no functional obstruction. Given the degree of dilation, it is possible that the patient experiences intermittent PUJ obstruction causing his symptoms. A 33-year-old male with insulin dependent diabetes mellitus and viral arthritis was referred for a bone scan. A three phase revealed increased uptake in the region of the knee and leR proximal tibia. Delayed whole body images revealed multiple focal areas of osteoblastic activity in the leR tibia. Abnormal uptake was also seen in the upper third of the leR femur. The remainder of the skeletal survey was normal. X-ray correlation of the leR tibia and femoral findings was undertaken. Combinating unilateral changes on bone scan and X-ray although very suggestive of sclerotic polyostotic fibrous dysplasia. Three cases with interesting and unusual bone scan findings assisted in further management and treatment of patients

108

Interesting bone scans - unusual findings  

Energy Technology Data Exchange (ETDEWEB)

A 59-year-old female with carcinoma of the colon and known liver metastatic disease was referred for bone scan to evaluate for bone metastases. Although no bone metastases were found, there was abnormal uptake noted in the liver corresponding to a metastatic calcified lesion. The only other findings were of degenerative disease in the cervical spine, right shoulder and small joints of the hands. A 69-year-old male with carcinoma of the prostate and right side low back pain was referred for bone scan. No focal abnormalities to suggest metastatic disease were identified; findings within the cervical spine, lumber spine and knees were presumed secondary to degenerative disease. Intermittent pain persisted and the patient was referred for a repeat bone scan six months later. Previous scan findings of degenerative disease and no metastatic disease were confirmed; however, closer inspection revealed an enlarged right kidney with significant retention of tracer in the pelvicalyceal system suggesting possible obstruction. A Retrograde pyelogram was performed, and no obvious obstruction demonstrated. As bone scan findings were very suggestive of obstruction, a DTPA scan with lasix was performed showing a dilated right collecting system with no functional obstruction. Given the degree of dilation, it is possible that the patient experiences intermittent PUJ obstruction causing his symptoms. A 33-year-old male with insulin dependent diabetes mellitus and viral arthritis was referred for a bone scan. A three phase revealed increased uptake in the region of the knee and leR proximal tibia. Delayed whole body images revealed multiple focal areas of osteoblastic activity in the leR tibia. Abnormal uptake was also seen in the upper third of the leR femur. The remainder of the skeletal survey was normal. X-ray correlation of the leR tibia and femoral findings was undertaken. Combinating unilateral changes on bone scan and X-ray although very suggestive of sclerotic polyostotic fibrous dysplasia. Three cases with interesting and unusual bone scan findings assisted in further management and treatment of patients

Dobson, M.; Wadhwa, S.S.; Mansberg, R.; Fernandes, V.B. [Wollongong Hospital, Wollongong, NSW (Australia)

1997-12-01

109

Bone Markers  

Science.gov (United States)

... of this website will be limited. Search Help? Bone Markers Share this page: Was this page helpful? ... decrease bone marker results? 1. Should everyone have bone marker testing performed? Bone marker testing is typically ...

110

Hemangioendotelioma Hepático Infantil e Rim Displásico Multiquístico: uma nova associação?  

Scientific Electronic Library Online (English)

Full Text Available SciELO Portugal | Language: Portuguese Abstract in portuguese O hemangioendotelioma hepático infantil tem uma incidência que é a terceira entre os tumores hepáticos da criança e é o tumor benigno hepático vascular mais frequente na infância. Apresentamos o caso clínico de uma criança com o diagnóstico de hemangioendotelioma hepático associado a rim displásico [...] multiquístico transitório. O diagnóstico de rim multiquístico foi confirmado por ecografia no período pré e pós natal. Numa ecografia realizada aos 5 meses detectaram-se lesões hepáticas sugestivas de hemangioendotelioma. Realizou ressonância magnética aos 8 meses que não mostrou o rim direito. A biópsia hepática confirmou o diagnóstico de hemangioendotelioma infantil tipo1. Em ecografias seriadas verificou-se redução das lesões hepáticas que desapareceram aos 19 meses. Esta associação de hemangioendotelioma hepático e rim multiquístico não se encontra descrita, embora sejam conhecidas associações com agenesia renal. Abstract in english Infantile hemangioendothelioma has an incidence that is the third most common between hepatic tumours in children and the most common benign vascular tumour of the liver in infancy. In this paper we report a clinical case of a child with hepatic hemangioendothelioma associated with a transitory mult [...] icystic dysplastic kidney. The multicystic disorder was evident pre and post natally. At 5 months an ultrasonography imaging showed multiple hepatic lesions suggestive of hemangioendothelioma. At 8 months a magnetic resonance imaging did not show the right kidney. Hepatic biopsy confirmed the diagnosis of infantile hemangioendothelioma. On ultrasonographies performed during follow up focal hepatic lesions reduced and disappeared by 19 months. This association has not been reported although cases associated with unilateral renal agenesis are known.

M. Carneiro de, Moura; P. Sampaio, Nunes; H., Flores; P. Sande, Lemos.

111

Selective Isotope Determination of Uranium using HR-RIMS  

International Nuclear Information System (INIS)

The detection of lowest abundances of the ultra trace isotope 236U in environmental samples requires an efficient detection method which allows a high elemental and isotopic selectivity to suppress neighbouring isotopes of the same element and other background. High Resolution Laser Resonance Ionization Mass Spectrometry (HR-RIMS) uses the individual electron structure of each isotope to provide an outstanding element and isotope selective ionization.

112

Factors influencing diagnostic yield of CT-guided percutaneous core needle biopsy for bone lesions  

International Nuclear Information System (INIS)

Aim: To evaluate the factors influencing diagnostic yield of computed tomography (CT)-guided percutaneous core needle biopsy (CNB) for bone lesions. Materials and methods: Between September 2005 and July 2011, 162 consecutive CT-guided CNB procedures were performed in 155 patients. The variables analysed were age, sex, lesion location, lesion type, lesion size, specimen size, biopsy needle gauge, and individual radiologist. The factors influencing diagnostic yield of CT-guided percutaneous CNB for bone lesions were determined by multivariate analysis of variables. Results: The diagnostic yield was 81.5%. Diagnostic yield was 89.9% for lytic bone lesions and 48.5% for sclerotic bone lesions (p < 0.001), and 89.2% for lesions ?3 cm and 73.4% for lesions <3 cm (p = 0.010). The significant factors influencing diagnostic yield of CT-guided percutaneous CNB for bone lesions were lesion type [p < 0.001; odds ratio (OR) for a lytic lesion was approximately 12 times higher than that for a sclerotic lesion; 95% confidence interval (CI): 4.22–34.01], and lesion size (p = 0.012; OR for a lesion size ?3 cm was about five-times higher than that for a lesion size <3 cm; 95% CI: 1.42–16.71). Conclusion: Lesion type and lesion size are determining factors in diagnostic yield. The higher diagnostic yield is correlated with lytic lesion and lesion size ?3 cm

113

Modelo de tumor experimental em rim de ratos  

Directory of Open Access Journals (Sweden)

Full Text Available O carcinossarcoma 256 de Walker tem despertado o interesse de muitos pesquisadores como modelo experimental para estudo da biologia tumoral. OBJETIVO: estabelecer um modelo de tumor renal que possa ser usado para estudar in vivo e in vitro, as alterações impostas pelas neoplasias. MÉTODOS: utilizados vinte ratos Wistar, machos, adultos, pesando entre 250-300 g, oriundos do Laboratório de Cirurgia Experimental da Universidade Federal do Ceará. Sob anestesia inalatória procedia-se uma pequena incisão supraumbilical, e com manobra delicada fazia-se a exposição do rim direito. Neste órgão eram inoculadas 3x10(5 células tumorais viáveis. Os animais então eram mantidos em gaiolas individuais com as mesmas condições ambientais e com água e dieta ad libitum. RESULTADOS: o Carcinossarcoma 256 de Walker, implantado no parênquima do rim direito de ratos Wistar apresentou índice de pega de 100%, e crescimento rápido, invadiu por contiguidade as estruturas vizinhas, porém sem apresentar metástases, no entanto, levando os animais a óbito no curso médio de 14 dias. CONCLUSÃO: o modelo de implante de tumor de Walker no parênquima do rim direito de ratos Wistar é eficiente, tem reprodutibilidade, apresentando um índice de pega de 100%, e permitindo seu uso em linhas de pesquisa.

Silva Lúcio Flávio Gonzaga

2002-01-01

114

Ultrasonic Resonance Spectroscopy of Composite Rims for Flywheel Rotors  

Science.gov (United States)

Flywheel energy storage devices comprising multilayered composite rotor systems are being studied extensively for utilization in the International Space Station. These composite material systems were investigated with a recently developed ultrasonic resonance spectroscopy technique. The ultrasonic system employs a continuous swept-sine waveform and performs a fast Fourier transform (FFT) on the frequency response spectrum. In addition, the system is capable of equalizing the amount of energy at each frequency. Equalization of the frequency spectrum, along with interpretation of the second FFT, aids in the evaluation of the fundamental frequency. The frequency responses from multilayered material samples, with and without known defects, were analyzed to assess the capabilities and limitations of this nondestructive evaluation technique for material characterization and defect detection. Amplitude and frequency changes were studied from ultrasonic responses of thick composite rings and a multiring composite rim. A composite ring varying in thickness was evaluated to investigate the full thickness resonance. The frequency response characteristics from naturally occurring voids in a composite ring were investigated. Ultrasonic responses were compared from regions with and without machined voids in a composite ring and a multiring composite rim. Finally, ultrasonic responses from the multiring composite rim were compared before and after proof spin testing to 63,000 rpm.

Harmon, Laura M.; Baaklini, George Y.

2002-01-01

115

Constraints on chondrule agglomeration from fine-grained chondrule rims  

Science.gov (United States)

Fine-grained rims around chondrules, Ca,Al-rich inclusions, and other coarse-grained components occur in most types of unequilibrated chondrites, most prominently in carbonaceous chondrites of the CM group. Based on mineralogical and petrographic investigations, it was suggested that rim structures in unequilibrated ordinary chondrites could have formed in the solar nebula by accretion of dust on the surfaces of the chondrules. Dust mantles in CM chondrites seem to have formed by accretion of dust on the surfaces of chondrules and other components during their passage through dust-rich regions in the solar nebula. Concentric mantles with compositionally different layers prove the existence of various distinct dust reservoirs in the vicinity of the accreting parent body. Despite mineralogical and chemical differences, fine-grained rims from other chondrite groups principally show striking similarities to dust mantle textures in CM chondrite. This implies that the formation of dust mantles was a cosmically significant event like the chondrule formation itself. Dust mantles seem to have formed chronologically between chondrule-producing transient heating events and the agglomeration of chondritic parent bodies. For this reason the investigation of dust mantle structures may help to answer the question of how a dusty solar nebula was transformed into a planetary system.

Metzler, K.; Bischoff, A.

1994-01-01

116

Bone metastases in stomach cancer patients: comparison of Tc-99m HDP scintigraphy and FDG PET/CT scan  

Energy Technology Data Exchange (ETDEWEB)

To evaluate the values of FDG PET/CT and Tc-99m HDP bone scan in the detection of bone metastases in stomach cancer patients. PET/CT and bone scan images obtained within a month of each other from patients with confirmed stomach cancer, from November 2003 to November 2006, were evaluated. The number and location of the bone lesions were noted. On PET ICT, discrete focal FDG uptake distinguishable from the background cortex or marrow activity was considered a positive finding. The CT portion of the PET/CT was also reviewed for osteoblastic or osteolytic lesions. Confirmation was made by further follow up images with PET/CT, bone scan, CT, and/or MRI. Images of 203 patients were included (69 female, 134 male, average age 60.5 yrs), of which 187 cases were concluded as free from bone metastasis and 16 cases positive for bone metastases. On patient basis, the overall sensitivity, specificity, and accuracy of PET/CT were 99.5%, 87.5%, and 98.5%, and of bone scan were 96.8%, 75.0%, and 95.1 %, respectively. On lesion basis, PET/CT detected more lesions in the cervical vertebrae, while bone scan detected more lesions in the rib cage and skull. There were 5 cases where PET/CT missed lesions seen on bone scan, and the CT portion of the PET/CT demonstrated sclerotic lesions in 3 cases, mixed osteolytic and sclerotic lesion in 1 case, and equivocal finding in 1 other case. In the diagnosis of bone metastasis in stomach cancer patients, PET/CT showed higher accuracy than bone scan. However, bone scan detected more lesions in the ribs and skull. The CT portion of the PET/CT should be carefully examined for osteoblastic metastases.

Na, Sae Jung; Yoo, I. R.; O, J. H.; Choi, W. H.; Kim, S. H.; Chung, S. K. [The Catholic University of Korea, Seoul (Korea, Republic of)

2007-07-01

117

Symptomatic giant (10-cm) bone island of the tibia  

International Nuclear Information System (INIS)

A bone island represents a focus of mature compact bone within the cancellous bone, and it can be diagnosed based on characteristic clinical and radiologic features. The lesion is typically asymptomatic with a preference for the pelvis, femur, and other long bones. On radiographs, the lesion appears as an ovoid, round or oblong homogeneously dense and sclerotic focus in the cancellous bone. The characteristic features of this lesion are radiating bony streaks, known as thorny radiations or pseudopodia. Most bone islands are small, and the majority of these lesions measure from 0.1 to 2.0 cm. A giant bone island, defined as having a diameter greater than 2 cm, has been rarely reported in the English-language literature. We report here on a case of a giant bone island that measured 10 x 1.7 x 1 cm in the diaphysis of the right tibia in a 31-year-old man who complained of right lower leg pain for 3 weeks. (orig.)

118

Rim formation and fission gas behaviour: some structure remarks  

International Nuclear Information System (INIS)

In high burn-up LWR nuclear fuel an increase of the Xe-mobility is observed in the rim region according to EPMA. This often coincides with an increase of the local porosity and the grain subdivision of the material in regions around the pores. The restructuring does not always imply disappearance of the prior grain boundaries. This seems to occur in a final step. Micro-XRD studies also show a contraction of the fuel lattice in the rim zone, reflecting mainly the release of accumulated stresses during irradiation, via reordering of defects and defect complexes, including sub-grain formation and displacement of Xe traps. The lattice contraction is not measurable when the fraction of restructured areas is low and the prior grain structure still remains. Nevertheless, in such a case, even the Xe signal by EPMA is observed to decrease, anticipating the displacement of Xe inside the grains, probably towards cavities. However, the quantitative proportion of Xe in matrix and pores can not be given by EPMA. This is confirmed by TEM examinations, showing still plenty of gas bubbles inside restructured grains, in spite of the low Xe signal detected by EPMA. An alternative determination therefore appears necessary. The fission gas release (FGR) behaviour of the rim zone seems then to depend basically on the efficiency of gas retention in its porosity. The closed character of these pores and the low percolation probability derived from the high pore to grain size ratio anticipate high pore to grain size ratio anticipate a low incidence of open porosity. Also, mechanical tests suggest a low pore interconnection probability by microcracking. However, at very high local burn-ups (>150 GWd/tM), too high porosity values are determined compared to the values derived from immersion density and solid swelling, suggesting the potential existence of open channels. Also, abnormally high porosity values by quantitative metallography might arise from grain pullout during sample preparation. Here, a rough estimation of the release fraction from the rim zone is made, considering the persistence of all prior grain boundaries and the interconnection of all pores near these boundaries in a range of one pore radius. In this mostly improbable case, a maximum release of about 15% is estimated. For a precise FGR characterisation of the rim zone, quantitative determinations of the pore connectivity and of the real ratio: Xe in matrix/Xe in pores still seem to be lacking. (authors)

119

The detection of sclerotic changes of the coronaries and heart valves by scanning beams (ultrafast computed tomography using EVOLUTION). Diagnostik von Coronar- und Herzklappenverkalkungen mit dem Elektronenstrahl-CT (Ultrafast-CT, Evolution)  

Energy Technology Data Exchange (ETDEWEB)

With the advent of ultrafast computed tomography the range of diagnostic procedures for the quantitative determination of pathological changes in the coronary arteries has been broadened. The calcified coronary plaques found in this study, which in some of the patients were markedly pronounced, gave no immediate clue as to what extent sclerotic changes had already occurred in the coronaries examined. Nor was it possible on the basis of this method to pinpoint the vascular sections showing calcified plaques in patients undergoing maintenance dialysis. It may, however, permit careful predictions to be made for patients at a high risk of developing coronary artery disease. Sclerotic changes of the heart values occur with above-average frequency in dialysis patients and may be assessed quantitatively by the method described. The results described show that findings revealed by scanning electron beams may provide indirect information on metabolic processes in patients suffering from chronic ailments. (orig./MG)

Oldendorf, M. (Abt. fuer Roentgendiagnostik, Klinikum Nord der Stadt Nuernberg (Germany)); Zeitler, E. (Abt. fuer Roentgendiagnostik, Klinikum Nord der Stadt Nuernberg (Germany)); Braun, J. (Abt. fuer Roentgendiagnostik, Klinikum Nord der Stadt Nuernberg (Germany)); Weber, P. (Abt. fuer Roentgendiagnostik, Klinikum Nord der Stadt Nuernberg (Germany))

1994-02-01

120

Computed tomographic scanning and radioisotope bone scanning  

International Nuclear Information System (INIS)

We report here a comparative study of bone scans, radiographs, and computed tomographic (CT) scanning in 30 patients with cancer of the breast. All the bone scans had focally increased uptake in the axial skeleton and were assessed with the corresponding radiographs. CT scans were made of the regions of focally increased uptake. In three patients with solitary bone scan abnormalities, two were shown on CT scans to have lytic and sclerotic lesions when the conventional radiographs showed only osteophytes and degenerative joint disease, and in one patient CT scans demonstrated degenerative disease of a costovertebral joint not shown on the radiographs. In two patients with multifocal abnormalities in the lumbar spine that could be accounted for by benign disease shown on the CT scans, radiography could explain only one lesion. In the remaining patients, there was agreement between the three methods. The results confirm the importance of excluding benign causes for bone scan abnormalities. (orig./MG) 891 MG/orig.- 892 MB

 
 
 
 
121

IISD RS @ ECLAC RIM, Summary Highlights, Bogotá, Colombia  

...ECLAC RIM, Summary Highlights, Bogotá, Colombia IISD RS, ENB, Sustainable Development, UNCSD, Rio+20, Post-2015 Development Agenda, ECLAC, Caribbean Forum: ...Latin America and the Caribbean: Follow-up to the development agenda beyond 2015 and Rio+20, 5-9 March 2013, Bogotá, Colombia on ...Sustainable Development (UNCSD or Rio+20), Post-2015 Development Agenda, Economic Comission for Latin America and the Caribbean (ECLAC), ...Latin America and the Caribbean: Follow-up to the development agenda beyond 2015 and Rio+ 20, 5-9 March 2013, Summary Highlights, Bogotá...

122

Evolution of the east rim of the Hellas basin, Mars  

Science.gov (United States)

The Hellas basin is a dominant feature in the ancient, southern cratered highlands of Mars. The east rim of Hellas is a complex geologic region affected by volcanism, tectonism, and channeling. A detailed study of the area between 27.5-42.4 degrees S and 260-275 degrees W was initiated to analyze the processes forming surface materials and to decipher the evolution of this geologically important highland area. Major units include Hadriaca and Tyrrhena Paterae in the north and Hesperian and Amazonian channeled plains and outflow channels in the south. A brief discussion of the findings is presented.

Crown, David A.; Price, Katherine H.; Greeley, Ronald

1991-01-01

123

Investigation about crack propagation paths in thin rim gears  

Directory of Open Access Journals (Sweden)

Full Text Available Crack propagation in gears is a problem related not only to the life of the components, but also to the concept of failsafe design. Fail safe design means to design a component in order that, if a failure occurs, this may cause a “safe failure”. This aspect is very important above all in aerospace industry. As a matter of fact, in aerospace application, the need of reducing weight brings to produce gears with very thick rim and web. Considering thin rim gears, when a crack is nucleated near the tooth root, it may propagate through the tooth (causing the loss of the entire tooth or a portion of it or the propagation may follow a path across the wheel diameter (causing the projection of big parts of the gear that may break the gearbox and may cause serious damage to the aircraft. The first failure mode is define as “failsafe failure” and the second one as “catastrophic failure” and of course has to be avoided. Designers need to have robust design criteria in order to predict crack propagation paths and to avoid catastrophic failures. In literature, few works are present concerning this topic, in particular related to the effect of geometrical parameters that may affect the crack propagation. In this work a numerical analysis about crack propagation in gears with respect to the backup ratio (ratio between tooth height and rim thickness, initial crack position and shape has been done by means of the Extended FEM (XFEM technique, realizing 3D models. XFEM 3D is a relatively new technique consisting in enriching traditional finite elements with more complex shape functions; in this way it is possible to propagate crack also between mesh nodes and to have mesh independent results. Aim of this paper is to highlight the crack propagation path in order to give to designers an high confident design criterion, related to the gear geometry. In particular, the effect of both rim thickness and orientation of the initial crack have been considered in order to enrich the literature knowledge. Numerical results obtained in this work have been compared with those found in the literature, showing a very good correlation.

F. Curà

2014-11-01

124

49 CFR 571.120 - Tire selection and rims and motor home/recreation vehicle trailer load carrying capacity...  

Science.gov (United States)

...2010-10-01 false Tire selection and rims and motor home/recreation vehicle trailer...Standards § 571.120 Tire selection and rims and motor home/recreation vehicle trailer...Scope. This standard specifies tire and rim selection requirements, rim marking...

2010-10-01

125

[Diagnostic imaging of liposclerosing myxofibrous tumor of bone].  

Science.gov (United States)

Liposclerosing myxofibrous tumor of bone is a benign lesion with a complex histologic structure. Its origin is uncertain, although it seems to be related to intraosseous lipomas and fibrous dysplasia, and it is sometimes impossible to distinguish from these two entities. It is usually located in the intertrochanteric region of the femur. Radiologically, it is a well-defined lytic lesion with sclerotic margins and high signal intensity in T2- weighted MR images. We present two cases with radiologic characteristics and location compatible with liposclerosing myxofibrous tumor of bone. In one case, PET studies suggested a malignant lesion. The diagnosis can be established on the basis of the radiological characteristics and location of the lesion: PET and histologic examination can sometimes lead to the wrong diagnosis. PMID:20303559

Nieto, A; Pérez-Andrés, R; Lorenzo, J C; Vilanova, J C

2010-01-01

126

Bone Cancer  

Science.gov (United States)

Cancer that starts in a bone is uncommon. Cancer that has spread to the bone from another part of the body is more common. There are three types of bone cancer: Osteosarcoma - occurs most often between ages 10 ...

127

Bone Diseases  

Science.gov (United States)

Your bones help you move, give you shape and support your body. They are living tissues that rebuild constantly ... childhood and your teens, your body adds new bone faster than it removes old bone. After about ...

128

Chandra Observations of the Northeastern Rim of the Cygnus Loop  

CERN Document Server

We present results from spatially resolved spectral analyses of the northeastern (NE) rim of the Cygnus Loop supernova remnant (SNR) based on two Chandra observations. One pointing includes northern outermost abundance-enhanced regions discovered by recent Suzaku observations, while the other pointing is located on regions with "normal" abundances in the NE rim of the Cygnus Loop. The superior spatial resolving power of Chandra allows us to reveal that the abundance-enhanced region is concentrated in an about 200"-thickness region behind the shock front. We confirm absolute metal abundances (i.e., relative to H) as well as abundance ratios between metals are consistent with those of the solar values within a factor of about 2. Also, we find that the emission measure in the region gradually decreases toward the shock front. These features are in contrast with those of the ejecta fragments around the Vela SNR, which leads us to believe that the abundance enhancements are not likely due to metal-rich ejecta. We ...

Katsuda, Satoru; Kimura, Masashi; Mori, Koji

2008-01-01

129

On the Rim of 'Victoria Crater' (Polar Projection)  

Science.gov (United States)

NASA's Mars rover Opportunity reached the rim of 'Victoria Crater' in Mars' Meridiani Planum region with a 26-meter (85-foot) drive during the rover's 951st Martian day, or sol (Sept. 26, 2006). After the drive, the rover's navigation camera took the three exposures combined into this view of the crater's interior. This crater has been the mission's long-term destination for the past 21 Earth months. A half mile in the distance one can see about 20 percent of the far side of the crater framed by the rocky cliffs in the foreground to the left and right of the image. The rim of the crater is composed of alternating promontories, rocky points towering approximately 70 meters (230 feet) above the crater floor, and recessed alcoves. The bottom of the crater is covered by sand that has been shaped into ripples by the Martian wind. The position at the end of the sol 951 drive is about six meters from the lip of an alcove called 'Duck Bay.' The rover team planned a drive for sol 952 that would move a few more meters forward, plus more imaging of the near and far walls of the crater. Victoria Crater is about five times wider than 'Endurance Crater,' which Opportunity spent six months examining in 2004, and about 40 times wider than 'Eagle Crater,' where Opportunity first landed. This view is presented as a polar projection with geometric seam correction.

2006-01-01

130

On the Rim of 'Victoria Crater' (Vertical Projection)  

Science.gov (United States)

NASA's Mars rover Opportunity reached the rim of 'Victoria Crater' in Mars' Meridiani Planum region with a 26-meter (85-foot) drive during the rover's 951st Martian day, or sol (Sept. 26, 2006). After the drive, the rover's navigation camera took the three exposures combined into this view of the crater's interior. This crater has been the mission's long-term destination for the past 21 Earth months. A half mile in the distance one can see about 20 percent of the far side of the crater framed by the rocky cliffs in the foreground to the left and right of the image. The rim of the crater is composed of alternating promontories, rocky points towering approximately 70 meters (230 feet) above the crater floor, and recessed alcoves. The bottom of the crater is covered by sand that has been shaped into ripples by the Martian wind. The position at the end of the sol 951 drive is about six meters from the lip of an alcove called 'Duck Bay.' The rover team planned a drive for sol 952 that would move a few more meters forward, plus more imaging of the near and far walls of the crater. Victoria Crater is about five times wider than 'Endurance Crater,' which Opportunity spent six months examining in 2004, and about 40 times wider than 'Eagle Crater,' where Opportunity first landed. This view is presented as a vertical projection with geometric seam correction.

2006-01-01

131

Multi-element RIMS Analysis of Genesis Solar Wind Collectors  

Science.gov (United States)

The samples of Solar Wind (SW) delivered by the NASA Genesis mission, present significant challenges for surface analytical techniques, in part due to severe terrestrial contamination of the samples on reentry, in part due to the ultra-shallow and diffused ion implants in the SW collector materials. We are performing measurements of metallic elements in the Genesis collectors using Resonance Ionization Mass Spectrometry (RIMS), an ultra-sensitive analytical method capable of detecting SW in samples with lateral dimensions of only a few mm and at concentrations from above one ppm to below one ppt. Since our last report at 2008 AGU Fall Meeting, we have (a) developed and tested new resonance ionization schemes permitting simultaneous measurements of up to three (Ca, Cr, and Mg) elements, and (b) improved reproducibility and accuracy of our RIMS analyses for SW-like samples (i.e. shallow ion implants) by developing and implementing an optimized set of new analytical protocols. This is important since the quality of scientific results from the Genesis mission critically depends on the accuracy of analytical techniques. In this work, we report on simultaneous RIMS measurements of Ca and Cr performed on two silicon SW collector samples, (#60179 and #60476). First, we have conducted test experiments with 3×1013 at/cm2 52Cr and 44Ca implants in silicon to evaluate the accuracy of our quantitative analyses. Implant fluencies were measured by RIMS to be 2.73×1013 and 2.71×1013 at/cm2 for 52Cr and 44Ca, respectively, which corresponds to an accuracy of ?10%. Using the same implanted wafer as a reference, we conducted RIMS analyses of the Genesis samples: 3 spots on #60179 and 4 spots on #60476. The elemental SW fluencies expected for Cr and Ca are 2.95×1010 and 1.33×1011 at/cm2 , respectively. Our measurements of 52Cr yielded 3.0±0.6×1011 at/cm2 and 5.1±4.1×1010 at/cm2 for #60179 and #60476, respectively. For 40Ca, SW fluencies of 1.39±0.70×1011 at/cm2 in #60179 and 3.6±2.5×1013 at/cm2 in #60476 were measured. Thus, only one element in each sample showed reasonable agreement with the expected values, Ca in #60179 and Cr in #60476. However the cleaning procedures applied to these samples were different: #60179 was only Megasonicated in ultra-pure water, while #60476 was subjected to longer Megasonication and an RCA cleaning procedure involving multiple rinsing steps with acid solutions. It is apparent that the surface contamination and cleaning procedures influenced the results of our measurements. We will present these experimental results and discuss procedures - including improved sample cleaning, dual-beam high resolution sputter depth profiling from front and back sides of the sample, and modeling of near-surface impurity transport - aimed at improving the accuracy of determination of elemental abundances by ion sputtering based analytical methods. This work is supported by NASA through a grant NNH08AH761 and by UChicago Argonne, LLC, under contract No. DE-AC02-06CH11357.

Veryovkin, I. V.; Tripa, C. E.; Zinovev, A. V.; King, B. V.; Pellin, M. J.; Burnett, D. S.

2009-12-01

132

A Microanalytical (TEM) Study of Fine-grained Chondrule Rims in NWA 5717  

Science.gov (United States)

Northwest Africa (NWA) 5717 is a highly primitive ordinary chondrite of petrologic type 3.05 with ubiquitous fine-grained chondrule rims [1, 2]. Rims appear around approximately 60% of chondrules and are comprised of micron-sized mineral and lithic fragments and microchondrules that are embdedded in an FeO-rich submicron groundmass that compositionally resembles fayalitic olivine. Some rim clasts appear overprinted with FeO-rich material, suggesting secondary alteration that postdates rim formation. Here we present a microanalytical (TEM) study of the submicron component (i.e. the groundmass) of the rims in order to determine the crystal structures and compositions of their constituent phases and decipher the accretion and alteration history recorded in rims.

Bigolski, J. N.; Frank, D. R.; Zolensky, Michael E.; Weisberg, M. K.; Ebel, D. S.; Rahman, Z.

2013-01-01

133

Analysis of the energy capacity of rim-spoke composite flywheels  

International Nuclear Information System (INIS)

The rim-spoke flywheel consisting of a rim, connected to the hub by spokes encompassing the rim periphery, is one of the most promising types of energy accumulators. For the rational design of rim-spoke flywheels, the authors investigate the dependence of their mass energy capacity and their volume energy capacity; the limit speed on the geometric parameters of the flywheel and the properties of the composites used in making the rim and the spokes are also examined. It is shown through various programs, worked out for analyzing the energy capacity of rim-spoke flywheels, that they can substantially facilitate the designing of such flywheels according to specified requirements that their operational characteristics have to meet

134

Percutaneous treatment of symptomatic aneurysmal bone cyst of L5 by percutaneous injection of osteoconductive material (Cerament).  

Science.gov (United States)

We present a case report of a 33-year-old woman with back pain for several months which was resistant to medical treatment. Thoracolumbar MRI and multidetector CT showed an aneurysmal bone cyst intersecting the body and pedicles of L5. Minimally invasive treatment was performed with percutaneous injection of osteoconductive cement (Cerament) to induce sclerosis and bone remodeling of the bone cyst lesion with an analgesic effect. Before treatment, spinal angiography was performed to exclude arterial afferents. No bone biopsy was done. Under general anesthesia and fluoroscopic guidance, a first vertebroplasty was performed by a bilateral transpedicular approach using the osteoconductive cement followed 2?months later by a second treatment with CT-fluoro-guided direct injection of Cerament. No complications occurred during the procedure. At 4 and 6?months follow-up the MRI/CT showed sclerotic bone remodeling of the walls of the aneurysmal cyst with clinical improvement. PMID:24211854

Guarnieri, Gianluigi; Vassallo, Pasquale; Muto, Massimo; Muto, Mario

2014-10-01

135

Measurement of the wear of railway wheel-rims by radioisotopes  

International Nuclear Information System (INIS)

A relative measuring method based on the ratio of the activities of prepared railway wheel-rim surfaces before and after the wear test was developed and tested. In a 5 ?m thick plated layer 59Fe isotope was electrolitically deposited onto the rim surface. The relative decrease of the recorded intensities and the application of the Wickers-track technique provide a rapid and reliable method to measure the wear of railway wheel-rim under operation conditions. (Sz.J.)

136

RIM, Munc13, and Rab3A interplay in acrosomal exocytosis  

International Nuclear Information System (INIS)

Exocytosis is a highly regulated, multistage process consisting of multiple functionally definable stages, including recruitment, targeting, tethering, priming, and docking of secretory vesicles with the plasma membrane, followed by calcium-triggered membrane fusion. The acrosome reaction of spermatozoa is a complex, calcium-dependent regulated exocytosis. Fusion at multiple sites between the outer acrosomal membrane and the cell membrane causes the release of the acrosomal contents and the loss of the membranes surrounding the acrosome. Not much is known about the molecules that mediate membrane docking in this particular fusion model. In neurons, the formation of the ternary RIM/Munc13/Rab3A complex has been suggested as a critical component of synaptic vesicles docking. Previously, we demonstrated that Rab3A localizes to the acrosomal region in human sperm, stimulates acrosomal exocytosis, and participates in an early stage during membrane fusion. Here, we report that RIM and Munc13 are also present in human sperm and localize to the acrosomal region. Like Rab3A, RIM and Munc13 participate in a prefusion step before the efflux of intra-acrosomal calcium. By means of a functional assay using antibodies and recombinant proteins, we show that RIM, Munc13 and Rab3A interplay during acrosomal exocytosis. Finally, we report by electron transmission microscopy that sequestering RIM and Rab3A alters the docking of the acrosomal membrane to the plasma membrane during calcium-activated acrosomal exocytosis. Our results suggest that the RIM/Munc13/Rab3 A complex participates in acrosomal exocytosis and that RIM and Rab3A have central roles in membrane docking. -- Highlights: ? RIM and Munc13 are present in human sperm and localize to the acrosomal region. ? RIM and Munc13 are necessary for acrosomal exocytosis. ? RIM and Munc13 participate before the acrosomal calcium efflux. ? RIM, Munc13 and Rab3A interplay in human sperm acrosomal exocytosis. ? RIM and Rab3A have critical roles in membrane docking.

137

Bone Densitometry (Bone Density Scan)  

Science.gov (United States)

• Overview Bone density scanning, also called dual-energy x-ray absorptiometry (DXA) or bone densitometry , is an enhanced form of x-ray technology that is used to measure bone loss. DXA is today's established standard for measuring ...

138

Bone Mass Measurement (Bone Density)  

Science.gov (United States)

... service covered? Search Medicare.gov for covered items Bone mass measurement (bone density) How often is it covered? Medicare Part ... see if you're at risk to broken bones, once every 24 months (more often if medically ...

139

The natural history of disappearing bone tumours and tumour-like conditions  

International Nuclear Information System (INIS)

We describe 27 cases of bone tumours or tumour-like lesions where there was spontaneous regression. The follow-up period was 2.8-16.7 years (average, 7.0 years). Fourteen of these cases were no longer visible on plain radiographs. Histological diagnosis included exostosis, eosinophilic granuloma, fibrous dysplasia, fibrous cortical defect, non-ossifying fibroma, osteoid osteoma and bone island. Most cases began to reduce in adolescence or earlier, although sclerotic type lesions showed their regression in older patients. All lesions thought to be eosinophilic granuloma began to regress after periods of less than 3 months, while the duration of the other lesions showed wide variation (1-74 months). As resolution of the lesions took between 2 and 79 months (mean, 25.0 ± 20.3 months) we consider that the most likely mechanism was recovery of normal skeletal growth control. In exostosis with fracture, alteration of vascular supply may contribute to growth arrest, but not to subsequent remodelling stage. In inflammatory-related lesions such as eosinophilic granuloma, cessation of inflammation may be the mechanism of growth arrest, whilst temporary inflammation may stimulate osteogenic cells engaged in remodeling. In the sclerotic type, growth arrest is a less probable mechanism. Necrosis within the tumour and/or local changes in hormonal control, plus remodelling of the sclerotic area takes longer. Knowledge of the potential for spontaneous resolution may help in managemeontaneous resolution may help in management of these tumour and tumour-like lesions of bone. Yanagawa, T. et al. (2001)

140

Eastern rim of the Chesapeake Bay impact crater: Morphology, stratigraphy, and structure  

Science.gov (United States)

This study reexamines seven reprocessed (increased vertical exaggeration) seismic reflection profiles that cross the eastern rim of the Chesapeake Bay impact crater. The eastern rim is expressed as an arcuate ridge that borders the crater in a fashion typical of the "raised" rim documented in many well preserved complex impact craters. The inner boundary of the eastern rim (rim wall) is formed by a series of raterfacing, steep scarps, 15-60 m high. In combination, these rim-wall scarps represent the footwalls of a system of crater-encircling normal faults, which are downthrown toward the crater. Outboard of the rim wall are several additional normal-fault blocks, whose bounding faults trend approximately parallel to the rim wall. The tops of the outboard fault blocks form two distinct, parallel, flat or gently sloping, terraces. The innermost terrace (Terrace 1) can be identified on each profile, but Terrace 2 is only sporadically present. The terraced fault blocks are composed mainly of nonmarine, poorly to moderately consolidated, siliciclastic sediments, belonging to the Lower Cretaceous Potomac Formation. Though the ridge-forming geometry of the eastern rim gives the appearance of a raised compressional feature, no compelling evidence of compressive forces is evident in the profiles studied. The structural mode, instead, is that of extension, with the clear dominance of normal faulting as the extensional mechanism. ?? 2005 Geological Society of America.

Poag, C.W.

2005-01-01

 
 
 
 
141

The Effects of Hydride Rim on the Ductility of Zr-based Nuclear Fuel Cladding  

International Nuclear Information System (INIS)

During operation in nuclear reactor the cladding tube forms a hydride rim that resides above a substrate that is relatively free of hydrides. A prediction of the ductility of such cladding tubes must take into account: the density of the hydrides as a layer/rim and the rim thickness, the ability of the hydrides to deform, their circumferential orientation within the layer, and the presence of a relatively unhydrided substrate. Recent experiments based on unirradiated cladding tubes containing hydrides in the form of a rim indicate a significant loss of ductility with increasing hydrogen content and/or increasing hydride rim thicknesses. These results suggest that a ductile-tobrittle transition occurs with increasing hydride rim thickness. Since the hydride rim initiates a crack early in the deformation process, fracture mechanics has been recently used to predict failure on the basis of crack propagation. While this type of analysis can be applied to brittle cladding with thick hydride rims, failure of cladding with small-thickness hydride rims exhibits significant ductility; importantly, this cladding does not appear to obey fracture mechanics, as the fracture stress approaches the tensile strength of the cladding

142

Intraosseous pneumatocysts of the ilium: findings on radiographs and CT scans  

International Nuclear Information System (INIS)

CT scans demonstrated a localized collection of gas adjacent to a normal sacroiliac joint in 5 patients. In each case the lesion was sharply demarcated by a thin sclerotic rim. A benign bone cyst was confirmed histologically in 2 cases. The radiologist should be aware of this appearance so as to avoid invasive procedures based on a misdiagnosis of infection or neoplasm

143

DATA MINING: A ‘RIM’ ALGORITHM FOR SPYWARE DETECTION WITH PRUNING  

Directory of Open Access Journals (Sweden)

Full Text Available The aim of this paper is to employ the principles of data mining and classify a new algorithm. In this method, we have proposed a new anti-spyware system (Spyware Detection, which is capable for classifying spyware files from legitimate files. Also we have evaluated the performance of our anti-spyware system with the existing anti- spywares in terms of overall accuracy (ACC and false positive rate (FPR... This paper describes the use of classification trees and shows the methods of pruning them using the new Algorithm.The RIM algorithm which can be classified and compared with other algorithms like Naïve Bayes, HNB (Hidden Naïve Bayes , Random Tree Algorithm The experimental results suggest that our method is better than the existing methods and shows the best result.

Mrs. Indulakshmi

2014-05-01

144

Donor corneoscleral rim contamination by gentamicin-resistant organisms  

Directory of Open Access Journals (Sweden)

Full Text Available Gentamicin is the most widely used antibiotic in the decontamination of donor cornea for penetrating keratoplasty. However, the incidence of resistance to gentamicin is on the rise. Bacterial isolates from 178 donor corneal rims were studied for gentamicin sensitivity. The overall rate of gentamicin resistance was 63.4%. At 86.2% the Pseudomonas. species had the highest rate of resistance, followed by Streptococci at 84.6%. The high rate of gentamicin resistance encountered by us and others suggest that either addition of a second antibiotic to corneal storage media or replacement of gentamicin by an antibiotic with a broader spectrum of activity may help reduce the risk of endophthalmitis following penetrating keratoplasty

Gopinathan Usha

1994-01-01

145

Infecção gonocócica em rim carcinomatoso / Gonococcal infection in carcinomatous kidney  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Os A.A. observaram um caso de infecção renal gonocócica, que relatam com as necessarias minucias, tanto sob o ponto de vista clinico-cirurgico como bacteriologico. 2 - Revendo a bibliografia sobre o assunto, verificaram que as infecções renais gonocócias são raras, e rarissimas as que apresentam pro [...] vas de identificação bacteriologica completa do gonocóco, como se fez no presente caso que deve figurar em 15º lugar, desde a descoberta do germen por Neisser, ha 59 anos. 3 - As provas bacteriologicas consistiram no exame bacterioscopico do sedimento urinario e pús renal, caracteres das colonias e culturas, seguidas de exames de esfregaços, provas de fermentação de glicose e maltose; sôro aglutinação e gono fixação. Todas as provas foram positivas para o gonocóco. 4- O rim não deve ser favoravel á proliferação do gonocóco, ou pela natureza do seu epitelio ou pela secreção de substancias que impeçam o seu desenvolvimento ou outra causa qualquer. Dada a frequencia das infecções gonocócicas no parelho urinario inferior, seria de esperar que, em grande numero de casos, fosse atingido o superior.5 - Como causas predisponentes a esse ataque secundario que se processa por vias sanguinea, linfatica ou contiguidade, cita Uhle as seguintes: 1º - perturbações congenitas, lesões obstrutoras, principalmente do ureter. 2º - calculos, tumores, etc. 3º - traumatismos seguidos de rutura e hemorragia e 4º - antecedentes patologícos não demonstrados. O nosso caso cabe no 2º paragrafo. O rim apresentava um tumor maligno e tinha inumeros calculos. 6 - Depois que o rim foi retirado pela intervenção cirurgica, que correu sem acidentes, o doente entrou logo a melhorar, tendo alta curado, do Hospital. Nada tem havido, até a presente data, que faça suspeitar, no desenvolvimento de qualquer metastase do tumor. Aliás, a operação foi indicada em virtude do estado infeccioso, sendo posterior á mesma a descoberta do carcinoma. 7 - Interessante referir tambem que, muito embora o rim estivesse atacado pelo gonocóco, o aparelho urinario inferior nada acusou nesse sentido, nem antes da operação, nem depois do doente ter tido alta. 8 - Casos como o presente, se bem que raros, pois que assim se têm mostrado nos centros onde a pesquiza é sistematica, devem aparecer outras vezes, sendo, portanto, sempre aconselhavel o exame bacteriologico dos casos de infecções renais supuradas. Abstract in english 1 - The AA. observed a case of gonococcal infection of kidney which they report with the necessary details, both from the clinico-surgical and bacteriological standpoints. 2 - In perusing the bibliography on the matter, they verified that gonococcal infections of kidney are rare, and very rare those [...] which present proofs of thorough bacteriological identification of the gonococcus, such as was furnished in the present case, which should occupy the 15th place since the discovery of the germ by Neisser, 59 years ago. 3 - In the bacterioscopical examination of the urinary sediment and of the pus from the kidney the bacteriological proofs are constituted by the characteristic features of the colonies and cultures, followed by examinations of the smears, by fermentation tests for glucose and maltose, by sero-agglutination and gono-fixation. All tests were positive for gonococcus. 4 - The kidney does not favour the proliferation of the gonococcus, either thanks to the nature of its epithelium, or thanks to the secretion of substances which prevent the development of the gonococcus, or thanks to any other cause. Taking into consideration the frequency of gonococcal infections of the lower urinary apparatus, it was to be expected that also the upper one should be attained in a great deal of cases. 5 - As to the causes which predispose to such a secondary attack proceeding by the way of blood, of lymphatic current or by contiguity, uhle quotes the following: 1º - Congenital disorders, obstruction changes, mainly of the ureter; 2º

Jorge de, Gouvêa; J. Guilherme, Lacorte.

146

Soft tissue aneurysmal bone cyst  

International Nuclear Information System (INIS)

A soft tissue aneurysmal bone cyst located in the right gluteus medius of a 21-year-old man is reported. On conventional radiography, the lesion demonstrated a spherically trabeculated mass with a calcific rim. On CT scan, it showed a well-organized peripheral calcification resembling a myositis ossificans. On MRI, it presented as a multilocular, cystic lesion with fluid-fluid levels. The lesion had no solid components except for intralesional septa. Although findings on imaging and histology were identical to those described in classical aneurysmal bone cyst, diagnosis was delayed because of lack of knowledge of this entity and its resemblance to the more familiar post-traumatic heterotopic ossification (myositis ossificans). (orig.)

147

Soft tissue aneurysmal bone cyst  

Energy Technology Data Exchange (ETDEWEB)

A soft tissue aneurysmal bone cyst located in the right gluteus medius of a 21-year-old man is reported. On conventional radiography, the lesion demonstrated a spherically trabeculated mass with a calcific rim. On CT scan, it showed a well-organized peripheral calcification resembling a myositis ossificans. On MRI, it presented as a multilocular, cystic lesion with fluid-fluid levels. The lesion had no solid components except for intralesional septa. Although findings on imaging and histology were identical to those described in classical aneurysmal bone cyst, diagnosis was delayed because of lack of knowledge of this entity and its resemblance to the more familiar post-traumatic heterotopic ossification (myositis ossificans). (orig.)

Wang, X.L.; Gielen, J.L.; Delrue, F.; De Schepper, A.M.A. [Department of Radiology, Universitair Ziekenhuis Antwerpen (University of Antwerp), Wilrijkstraat 10, 2650, Edegem (Belgium); Salgado, R. [Department of Pathology, Universitair Ziekenhuis Antwerpen (University of Antwerp), Wilrijkstraat 10, 2650, Edegem (Belgium)

2004-08-01

148

Bone Densitometry  

Medline Plus

Full Text Available ... less frequently. Osteoporosis is a major cause of hip and vertebral fractures in older people. Our bones are continually being replaced. New bone is deposited while the body recycles old bone. ... easier. New bone in the hips and vertebrae has the highest possibility of becoming ...

149

Whale bones  

Science.gov (United States)

Vertebrates, or animals that have a skeletal structure for body support, leave bones behind after their death. These bones can be placed together to recreate the skeletal frame of that animal. Bones can be examined to determine what animal the bones came from.

N/A N/A (Go Card USA;)

2007-12-21

150

La Niña diversity and Northwest Indian Ocean Rim teleconnections  

Science.gov (United States)

The differences in tropical Pacific sea surface temperature (SST) expressions of El Niño-Southern Oscillation (ENSO) events of the same phase have been linked with different global atmospheric circulation patterns. This study examines the dynamical forcing of precipitation during October-December (OND) and March-May (MAM) over East Africa and during December-March (DJFM) over Central-Southwest Asia for 1950-2010 associated with four tropical Pacific SST patterns characteristic of La Niña events, the cold phase of ENSO. The self-organizing map method along with a statistical distinguishability test was used to isolate La Niña events, and seasonal precipitation forcing was investigated in terms of the tropical overturning circulation and thermodynamic and moisture budgets. Recent La Niña events with strong opposing SST anomalies between the central and western Pacific Ocean (phases 3 and 4), force the strongest global circulation modifications and drought over the Northwest Indian Ocean Rim. Over East Africa during MAM and OND, subsidence is forced by an enhanced tropical overturning circulation and precipitation reductions are exacerbated by increases in moisture flux divergence. Over Central-Southwest Asia during DJFM, the thermodynamic forcing of subsidence is primarily responsible for precipitation reductions, with moisture flux divergence acting as a secondary mechanism to reduce precipitation. Eastern Pacific La Niña events in the absence of west Pacific SST anomalies (phases 1 and 2), are associated with weaker global teleconnections, particularly over the Indian Ocean Rim. The weak regional teleconnections result in statistically insignificant precipitation modifications over East Africa and Central-Southwest Asia.

Hoell, Andrew; Funk, Chris; Barlow, Mathew

2014-11-01

151

Out of the Blue: The Pacific Rim as a Region  

Directory of Open Access Journals (Sweden)

Full Text Available In 1993, in advance of what was to be the first Asia Pacific Economic Cooperation (APEC leader’s summit, US president Bill Clinton gave a lecture at Waseda University in Japan. In his speech, Clinton called for the creation of a “community of the Pacific.” The idea of a Pacific community is neither Clinton’s nor the Democratic Party’s invention, however. In the previous decade Ronald Reagan had already used it, going even beyond later conceptualizations, by referring to the 21st century as the Pacific’s century. But Reagan's prophecy concerning the Great Ocean was not new back in the 1980s either. In 1900 then US Secretary of State John Hay wrote: “the Mediterranean is the ocean of the past, the Atlantic the ocean of the present and the Pacific is the ocean of the future.” In a more general manner, as Christopher Coker has observed, the notion of the “Century of the Pacific” is plausible because it is consistent with the idea, popularized by Hegel, that the spirit of civilization is moving toward that part of the globe. Thus, the century of the Pacific has become a kind of zeitgeist. In this paper I undertake a conceptual, historical, and theoretical journey through the “Pacific Rim” or “Asia-Pacific,” as it has been called more recently. Although I will question the utility of the term, I want to make clear that my purpose is only to undertake a critical survey of “the Pacific.” As in any trip, however, one needs a starting point. But, What is the starting point of the Pacific Rim, that geographic zone that has been compared to Pascal’s sphere: “with periphery indeterminable and a center that may be anywhere”?

Arturo Santa-Cruz

2005-08-01

152

La Niña diversity and Northwest Indian Ocean Rim teleconnections  

Science.gov (United States)

The differences in tropical Pacific sea surface temperature (SST) expressions of El Niño-Southern Oscillation (ENSO) events of the same phase have been linked with different global atmospheric circulation patterns. This study examines the dynamical forcing of precipitation during October-December (OND) and March-May (MAM) over East Africa and during December-March (DJFM) over Central-Southwest Asia for 1950-2010 associated with four tropical Pacific SST patterns characteristic of La Niña events, the cold phase of ENSO. The self-organizing map method along with a statistical distinguishability test was used to isolate La Niña events, and seasonal precipitation forcing was investigated in terms of the tropical overturning circulation and thermodynamic and moisture budgets. Recent La Niña events with strong opposing SST anomalies between the central and western Pacific Ocean (phases 3 and 4), force the strongest global circulation modifications and drought over the Northwest Indian Ocean Rim. Over East Africa during MAM and OND, subsidence is forced by an enhanced tropical overturning circulation and precipitation reductions are exacerbated by increases in moisture flux divergence. Over Central-Southwest Asia during DJFM, the thermodynamic forcing of subsidence is primarily responsible for precipitation reductions, with moisture flux divergence acting as a secondary mechanism to reduce precipitation. Eastern Pacific La Niña events in the absence of west Pacific SST anomalies (phases 1 and 2), are associated with weaker global teleconnections, particularly over the Indian Ocean Rim. The weak regional teleconnections result in statistically insignificant precipitation modifications over East Africa and Central-Southwest Asia.

Hoell, Andrew; Funk, Chris; Barlow, Mathew

2014-03-01

153

Radial Internal Material Handling System (RIMS) for Circular Habitat Volumes  

Science.gov (United States)

On planetary surfaces, pressurized human habitable volumes will require a means to carry equipment around within the volume of the habitat, regardless of the partial gravity (Earth, Moon, Mars, etc.). On the NASA Habitat Demonstration Unit (HDU), a vertical cylindrical volume, it was determined that a variety of heavy items would need to be carried back and forth from deployed locations to the General Maintenance Work Station (GMWS) when in need of repair, and other equipment may need to be carried inside for repairs, such as rover parts and other external equipment. The vertical cylindrical volume of the HDU lent itself to a circular overhead track and hoist system that allows lifting of heavy objects from anywhere in the habitat to any other point in the habitat interior. In addition, the system is able to hand-off lifted items to other material handling systems through the side hatches, such as through an airlock. The overhead system consists of two concentric circle tracks that have a movable beam between them. The beam has a hoist carriage that can move back and forth on the beam. Therefore, the entire system acts like a bridge crane curved around to meet itself in a circle. The novelty of the system is in its configuration, and how it interfaces with the volume of the HDU habitat. Similar to how a bridge crane allows coverage for an entire rectangular volume, the RIMS system covers a circular volume. The RIMS system is the first generation of what may be applied to future planetary surface vertical cylinder habitats on the Moon or on Mars.

Howe, Alan S.; Haselschwardt, Sally; Bogatko, Alex; Humphrey, Brian; Patel, Amit

2013-01-01

154

Space Plasma Ion Processing of the Lunar Soil: Modeling of Radiation-Damaged Rim Widths on Lunar Grains  

Science.gov (United States)

Chemically and microstructurally complex altered rims around grains in the finest size fraction (grain rims, and to delineate the portions of rims that represent Radiation-Amorphized (RA) host grain from overlying amorphous material that represents vapor/sputter deposits. For the portion of rims formed by host grain amorphization (henceforth called RA rims), we have been investigating the feasibility of using Monte Carlo-type ion-atom collision models, combined with experimental ion irradiation data, to derive predictive numerical models linking the width of RA rims to the grain s integrated solar ion radiation exposure time.

Chamberlin, S.; Christoffersen, R.; Keller, L.

2007-01-01

155

From Theory to Practice: "Kaizen" and the Academy of the Pacific Rim  

Science.gov (United States)

In this article, the author profiles the Academy of the Pacific Rim Charter Public School (Hyde Park, Massachusetts) and describes the school's culture. The school's students, who are in grades 6 through 12, are surrounded by rituals, routines, and relationship-building activities. Pacific Rim's culture stems from and supports the school's…

Blasdale, Spencer

2004-01-01

156

78 FR 15920 - Federal Motor Vehicle Safety Standards; Tire Selection and Rims  

Science.gov (United States)

...Standards; Tire Selection and Rims AGENCY...rulemaking process, see the...Recreational Vehicle Industry Association...the National Automotive Sampling...products and processes, such as...product, process or material...Society of Automotive Engineers...110 Tire selection and rims...

2013-03-13

157

Nonspecificity of the rim sign in the scintigraphic diagnosis of missed testicular torsion  

International Nuclear Information System (INIS)

Causes of a hyperemic peritesticular rim on dynamic and static scintigrams are reviewed. Of 6 patients exhibiting such a pattern, 3 had missed testicular torsion; the other 3 had tumor, trauma, or inflamation. The authors conclude that a hyperemic peritesticular rim is a nonspecific finding reflecting underlying pathophysiological changes and is not pathognomonic of missed torsion

158

Nonspecificity of the rim sign in the scintigraphic diagnosis of missed testicular torsion  

Energy Technology Data Exchange (ETDEWEB)

Causes of a hyperemic peritesticular rim on dynamic and static scintigrams are reviewed. Of 6 patients exhibiting such a pattern, 3 had missed testicular torsion; the other 3 had tumor, trauma, or inflamation. The authors conclude that a hyperemic peritesticular rim is a nonspecific finding reflecting underlying pathophysiological changes and is not pathognomonic of missed torsion.

Vieras, F.; Kuhn, C.R.

1983-02-01

159

Analysis of bubble pressure in the rim region of high burnup PWR fuel  

Energy Technology Data Exchange (ETDEWEB)

Bubble pressure in the rim region of high burnup PWR UO{sub 2} fuel has been modeled based on measured rim width, porosity and bubble density. Using the assumption that excessive bubble pressure in the rim is inversely proportional to its radius, proportionality constant is derived as a function of average pellet burnup and bubble radius. This approach is possible because the integration of the number of Xe atoms retained in the rim bubbles, which can be calculated as a function of bubble radius, over the bubble radius gives the total number of Xe atoms in the rim bubbles. Here the total number of Xe atoms in the rim bubbles can be derived from the measured Xe depletion fraction in the matrix and the calculated rim thickness. Then the rim bubble pressure is obtained as a function of fuel burnup and bubble size from the proportionality constant. Therefore, the present model can provide some useful information that would be required to analyze the behavior of high burnup PWR UO{sub 2} fuel under both normal and transient operating conditions. 28 refs., 9 figs. (Author)

Koo, Yang Hyun; Lee, Byung Ho; Sohn, Dong Seong [Korea Atomic Energy Research Institute, Taejeon (Korea)

2000-02-01

160

The RIMS Beginning Teacher Support and Assessment Partnership: A Study of Eight Years of Collaboration.  

Science.gov (United States)

In the year 2003, the Beginning Teacher Support and Assessment Program (BTSA) will become a mandatory credentialing program for California's new teachers. At a local level, the Riverside, Inyo, Mono, San Bernardino Beginning Teacher Support and Assessment Program (RIMS/BTSA) is one of 147 BTSA programs. Now entering its eighth year, the RIMS/BTSA…

Hendrick, Linda Scott; Childress, Linda J.

 
 
 
 
161

Anomalous linewidths and peak height ratios in continuous-wave RIMS  

International Nuclear Information System (INIS)

This paper describes effects of optical pumping in certain RIMS experiments. We show that anomalous peak height ratios and broadening effects can result from optically-induced redistribution of magnetic substate populations. We also show how lineshapes and peak heights in RIMS can be altered by branching to metastable electronic states. 6 refs., 5 figs., 1 tab

162

Nonspecificity of the rim sign in the scintigraphic diagnosis of missed testicular torsion  

International Nuclear Information System (INIS)

Causes of a hyperemic peritesticular rim on dynamic and static scintigrams are reviewed. Of 6 patients exhibiting such a pattern, 3 had missed testicular torsion; the other 3 had tumor, trauma, or inflammation. The authors conclude that a hyperemic peritesticular rim is a nonspecific finding reflecting underlying pathophysiological changes and is not pathognomonic of missed torsion

163

Fabrication of occlusal rims to record the maxillomandibular relation for complete dentures.  

Science.gov (United States)

This article describes an alternative method to establish the inclination of the occlusal plane by using the hamular notch, incisive papilla plane. By using this plane, the fabrication of occlusal rims that conform to an ideal relationship may make chairside trimming of the rims more straightforward. PMID:24461948

Jayachandran, Sivakumar; Grey, Nicholas

2014-08-01

164

Prostate cancer with lytic bone metastases: 18F-fluorodeoxyglucose positron emission tomography-computed tomography for diagnosis and monitoring response to medical castration therapy  

International Nuclear Information System (INIS)

Lytic bone metastases are rare in prostate cancer. We here present 18 fluorine fluorodeoxyglucose (18F-FDG) positron emission tomography computed tomography (PET-CT) images of a 67-year-old male patient with lytic metastases from prostate cancer. Repeat 18F-FDG PET-CT done 6 months later showed response to medical castration therapy. While the role of 18F-FDG PET-CT for sclerotic bone metastases in prostate cancer remains controversial, it appears to be useful for detection and response assessment of lytic prostate cancer metastases. (author)

165

A quantitative approach to understanding amphibole reaction rims: Texture, mineralogy, and processes of formation  

Science.gov (United States)

Amphibole is an important mineral present in many calc-alkaline volcanic deposits. A hydrous phase, volcanic amphibole is only stable at pressures greater than 100 MPa (approx. 4 km) and in melts containing at least 4 wt % H2O. When removed from their thermal and barometric stability field, amphiboles decompose to form aggregate rims of anhydrous minerals. Reaction rim thicknesses have been used to estimate timescales and rates of magma ascent, important parameters in determining eruptive style. However, the textures and mineralogy of reaction rims are complex; multiple forcing factors, such as heating and decompression, are responsible for their formation. Few studies have performed in-depth, systematic, and quantitative investigations of reaction rim textures and mineralogy: as a result, amphibole reaction rims are poorly understood. Based on natural reaction rims from Augustine Volcano Alaska, we have developed a new crystallization kinetics model for reaction rim formation in which the differences in reaction rim textures represent different degrees of forcing away from equilibrium. We present the results of an experimental study used to test this model. We performed experiments using a sintered high-silica andesite glass from the 2006 eruption of Augustine volcano. The starting powder was seeded with unrimmed amphibole phenocrysts. After at least 24 hours of equilibration at Augustine storage conditions (140 MPa/ 860oC), experiments were heated or decompressed. The experimental series experiments took samples to differing degrees of thermal of barometric instability, over different time scales, ranging from 3 hours to several days. The resulting reaction rims were analyzed using a variety of analytical imaging and X-ray mapping techniques. Reaction rims thickened and became more texturally and mineralogically complex as a result of 1) greater time spent outside of stability and; 2) the magnitude of instability experienced.

De Angelis, S. H.; Larsen, J. F.; Coombs, M. L.; Dunn, A.

2012-12-01

166

The RimL transacetylase provides resistance to translation inhibitor microcin C.  

Science.gov (United States)

Peptide-nucleotide antibiotic microcin C (McC) is produced by some Escherichia coli strains. Inside a sensitive cell, McC is processed, releasing a nonhydrolyzable analog of aspartyl-adenylate, which inhibits aspartyl-tRNA synthetase. The product of mccE, a gene from the plasmid-borne McC biosynthetic cluster, acetylates processed McC, converting it into a nontoxic compound. MccE is homologous to chromosomally encoded acetyltransferases RimI, RimJ, and RimL, which acetylate, correspondingly, the N termini of ribosomal proteins S18, S5, and L12. Here, we show that E. coli RimL, but not other Rim acetyltransferases, provides a basal level of resistance to McC and various toxic nonhydrolyzable aminoacyl adenylates. RimL acts by acetylating processed McC, which along with ribosomal protein L12 should be considered a natural RimL substrate. When overproduced, RimL also makes cells resistant to albomycin, an antibiotic that upon intracellular processing gives rise to a seryl-thioribosyl pyrimidine that targets seryl-tRNA synthetase. We further show that E. coli YhhY, a protein related to Rim acetyltransferases but without a known function, is also able to detoxify several nonhydrolyzable aminoacyl adenylates but not processed McC. We propose that RimL and YhhY protect bacteria from various toxic aminoacyl nucleotides, either exogenous or those generated inside the cell during normal metabolism. PMID:25002546

Kazakov, Teymur; Kuznedelov, Konstantin; Semenova, Ekaterina; Mukhamedyarov, Damir; Datsenko, Kirill A; Metlitskaya, Anastasija; Vondenhoff, Gaston H; Tikhonov, Anton; Agarwal, Vinayak; Nair, Satish; Van Aerschot, Arthur; Severinov, Konstantin

2014-10-01

167

Low Bone Density (Osteopenia)  

Science.gov (United States)

... You are here Home » Low Bone Density Low Bone Density Low bone density is when your bone ... to people with normal bone density. Detecting Low Bone Density A bone density test will determine whether ...

168

Bone Crusher  

Science.gov (United States)

Students use a tension-compression machine (or an alternative bone-breaking setup) to see how different bones fracture differently and with different amounts of force, depending on their body locations. Teams determine bone mass and volume, calculate bone density, and predict fracture force. Then they each test a small animal bone (chicken, turkey, cat) to failure, examining the break to analyze the fracture type. Groups conduct research about biomedical challenges, materials and repair methods, and design repair treatment plans specific to their bones and fracture types, presenting their design recommendations to the class.

National Science Foundation GK-12 and Research Experience for Teachers (RET) Programs,

169

Living Bones, Strong Bones  

Science.gov (United States)

In this activity about engineering, nutrition, and physical activity, learners design and build a healthy bone model of a space explorer which is strong enough to withstand increasing amounts of weight. This activity contains several engaging mini-activities and stresses the importance of the scientific method. Learners can complete this activity as part of NASA's Fit Explorer Challenge, in which learners train like astronauts, set goals, track their progress, and accumulate points to progress through Exploration Levels and earn certificates.

Center, Nasa J.

2012-06-26

170

"Repair of cranial bone defects using endochondral bone matrix gelatin in rat "  

Directory of Open Access Journals (Sweden)

Full Text Available Bone matrix gelatin (BMG has been used for bone induction intramuscularly and subcutaneously by many investigators since 1965. More recently, some of the researchers have used BMG particles for bone repair and reported various results. In present study for evaluation of bone induction and new bone formation in parital defects, BMG particles were used in five groups of rats. The BMG was prepared as previously described using urist method. The defects wee produced with 5 –mm diameter in pariteal bones and filled by BMG particles. No BMG was used in control group.For evaluation of new bone formation and repair, the specimens were harvested on days 7 , 14 , 21 and 28 after operation. The samples were processed histologically, stained by H& E, alizarin red S staining, and Alcian blue, and studied by a light microscope.The results are as follows:In control group: Twenty-eight days after operation a narrow rim of new bone was detectable attached to the edge of defect.In BMG groups: At day 7 after operation young chondroblast cells appeared in whole area of defect. At 14th day after operation hypertrophic chondrocytes showed by Alcian blue staining and calcified cartilage were detectable by Alizarin red S staining. The numerous trabeculae spicules, early adult osteocytes and highly proliferated red bone marrow well developed on dayd 21 . finally typic bone trabeculae with regulated osteoblast cells and some osteoclast cells were detectable at day 28 after operation. In conclusion,BMG could stimulate bone induction and new bone formation in bony defects. So, it seems that BMG could be a godd biomaterial substance for new bone inducation in bone defects

"Sobhani A

2001-05-01

171

49 CFR 571.120 - Tire selection and rims and motor home/recreation vehicle trailer load carrying capacity...  

Science.gov (United States)

...follows: (1) “T” indicates The Tire and Rim Association. (2) “E” indicates The European Tyre and Rim Technical Organisation (3) “J” indicates Japan Automobile Tire Manufacturers' Association, Inc. (4) “D” indicates Deutsche...

2010-10-01

172

75 FR 14243 - Pacific Rim Railway Company, Inc.-Acquisition and Operation Exemption-City of Keokuk, IA  

Science.gov (United States)

...Surface Transportation Board [STB Finance Docket No. 35359] Pacific Rim Railway Company, Inc.--Acquisition and Operation Exemption--City of Keokuk, IA Pacific Rim Railway Company, Inc. (PRIM), a noncarrier, has filed a...

2010-03-24

173

Bone Densitometry  

Medline Plus

Full Text Available X-Plain Bone Densitometry Reference Summary Introduction Bone densitometry is a helpful radiological test for detecting the early stages of osteoporosis, before any symptoms occur. Your doctor ...

174

Bone Densitometry  

Medline Plus

Full Text Available X-Plain Bone Densitometry Reference Summary Introduction Bone densitometry is a helpful radiological test for detecting the early stages of osteoporosis, before any symptoms occur. Your doctor may have ...

175

Bone Densitometry  

Medline Plus

Full Text Available ... well as bed rest, weakens the bones. A diet low in dairy products and calcium can make ... with oral medication, staying active and a healthy diet. Bone density tests are available and very helpful ...

176

Bone scan  

Science.gov (United States)

... seen on a regular x-ray (most commonly hip fractures, stress fractures in the feet or legs, or spine fractures) Diagnose a bone infection (osteomyelitis) Diagnose or determine the cause of bone ...

177

Bone Densitometry  

Medline Plus

Full Text Available X-Plain Bone Densitometry Reference Summary Introduction Bone densitometry is a helpful radiological test for detecting the early stages of osteoporosis, before any symptoms occur. ...

178

Upper rim guanidinocalix[4]arenes as artificial phosphodiesterases.  

Science.gov (United States)

Calix[4]arene derivatives, blocked in the cone conformation and functionalized with two to four guanidinium units at the upper rim were synthesized and investigated as catalysts in the cleavage of the RNA model compound 2-hydroxypropyl p-nitrophenyl phosphate. When compared with the behavior of a monofunctional model compound, the catalytic superiority of the calix[4]arene derivatives points to a high level of cooperation between catalytic groups. Combination of acidity measurements with the pH dependence of catalytic rates unequivocally shows that a necessary requisite for effective catalysis is the simultaneous presence, on the same molecular framework, of a neutral guanidine acting as a general base and a protonated guanidine acting as an electrophilic activator. The additional guanidinium (guanidine) group in the diprotonated (monoprotonated) trifunctional calix[4]arene acts as a more or less innocent spectator. This is not the case with the tetrasubstituted calix[4]arene, whose mono-, di-, and triprotonated forms are slightly less effective than the corresponding di- and triguanidinocalix[4]arene derivatives, most likely on account of a steric interference with HPNP caused by overcrowding. PMID:22364173

Baldini, Laura; Cacciapaglia, Roberta; Casnati, Alessandro; Mandolini, Luigi; Salvio, Riccardo; Sansone, Francesco; Ungaro, Rocco

2012-04-01

179

The Frosty Rims of Lomonosov Crater in Winter  

Science.gov (United States)

It is still winter in the northern hemisphere of Mars. On April 20, 2000, the Mars Orbiter Camera (MOC) onboard Mars Global Surveyor (MGS) captured this view of a chilly Lomonosov Crater. The rims of the crater appear white because they are covered with wintertime frost. A dark patch just right of center on the crater floor is a sand dune field. Both low-lying ground fogs(fuzzy, patchy areas around the lower perimeter of the crater) and higher cloud layers (fuzzy white arcs seen within the crater and towards the upper right) obscure much of the surface. The sun, only 12o above the horizon, bathes the scene in a reddish-brown hue. Lomonosov Crater is about 150 km (93 mi) across and located on the martian northern plains at 64.8o N, 8.8o W. The crater is named for the 18th Century Russian chemist, Mikhail V. Lomonosov (1741-1765). Spring will arrive in the martian northern hemisphere around June 1, 2000, and summer will come in December 2000. Sunlight illuminates this scene from the lower left.

2000-01-01

180

3He film flow on a round rim beaker  

International Nuclear Information System (INIS)

The superfluid properties of thin (100-150 nm) of 3He were investigated by measuring the rate at which a beaker of liquid 3He emptied itself through the adsorbed film, with the film thickness ? decreasing as the level dropped. A beaker rim with a semicircular cross-section was used to provide a well defined geometry and to avoid the effects of small scratches that may have affected earlier experiments. The film thicknesses were determined by Atkins' oscillation measurements of 4He films on the same surface. The superfluid transition temperature in the film TFc was suppressed below the bulk value TBc, and was close to being described by 2?/?(TFc) = ?, as expected for A-phase. The critical current density was more than an order of magnitude smaller than expected for pair-breaking. When a 4He monolayer was adsorbed on the substrate, there was no suppression of TFc and the critical current density was much larger. With or without the 4He monolayer an abrupt decrease in the flow rate was observed as the film thinned, which may be associated with the B to A-phase transition that should occur

 
 
 
 
181

Compositional evidence regarding the origins of rims on Semarkona chondrules  

Science.gov (United States)

The compositions of the interiors and abraded surfaces of 7 chondrules from Semarkona (LL3.0) were measured by neutron activation analysis. For nonvolatile elements, the lithophile and siderophile element abundance patterns in the surfaces are generally similar to those in the corresponding interiors. Siderophile and chalcophile concentrations are much higher in the surfaces, whereas lithophile concentrations are similar in both fractions. Most of the similarities in lithophile patterns and some of the similarities in siderophile patterns between surfaces and interiors may reflect incomplete separation of the fractions in the laboratory, but for 3 or 4 chondrules the siderophile resemblance is inherent, implying that the surface and interior metal formed from a single precursor assemblage. Metal and sulfide-rich chondrule rims probably formed when droplets of these phases that migrated to the chondrule surface during melting were reheated and incorporated into matrix-like material that had accreted onto the surface. The moderately-volatile to volatile elements K, As and Zn tend to be enriched in the surfaces compared with other elements of similar mineral affinity; both enrichments and depletions are observed for other moderately volatile elements. A small fraction of chondrules experienced fractional evaporation while they were molten. ?? 1987.

Grossman, J.N.; Wasson, J.T.

1987-01-01

182

Bone Basics  

Science.gov (United States)

This is an activity (on page 2 of the PDF) about the two main components of bone - collagen and minerals (like calcium) - and how they each contribute to its flexibility and strength. Learners will submerge 3 chicken bones in water, bleach, and vinegar, wait 24 hours, then observe and test each bone. This resource includes information about how nanoscientists are trying to produce artificial analogs to these components and relates to linked video, DragonflyTV Nano: Bone Regrowth.

Twin Cities Public Television, Inc.

2008-01-01

183

Near-IR Imaging Polarimetry toward a Bright-Rimmed Cloud: Magnetic Field in SFO 74  

CERN Document Server

We have made near-infrared (JHKs) imaging polarimetry of a bright-rimmed cloud (SFO 74). The polarization vector maps clearly show that the magnetic field in the layer just behind the bright rim is running along the rim, quite different from its ambient magnetic field. The direction of the magnetic field just behind the tip rim is almost perpendicular to that of the incident UV radiation, and the magnetic field configuration appears to be symmetric as a whole with respect to the cloud symmetry axis. We estimated the column and number densities in the two regions (just inside and far inside the tip rim), and then derived the magnetic field strength, applying the Chandrasekhar-Fermi method. The estimated magnetic field strength just inside the tip rim, ~90 uG, is stronger than that far inside, ~30 uG. This suggests that the magnetic field strength just inside the tip rim is enhanced by the UV radiation induced shock. The shock increases the density within the top layer around the tip, and thus increases the str...

Kusune, Takayoshi; Miao, Jingqi; Tamura, Motohide; Sato, Yaeko; Kwon, Jungmi; Watanabe, Makoto; Nishiyama, Shogo; Nagayama, Takahiro; Sato, Shuji

2014-01-01

184

Bone Biopsy  

Science.gov (United States)

• Overview A bone biopsy is an image-guided procedure in which a small sample of a bone is removed from the body and ... is often called a closed or needle bone biopsy , because it involves inserting a needle directly into ...

185

The PacC-family protein Rim101 prevents selenite toxicity in Saccharomyces cerevisiae by controlling vacuolar acidification.  

Science.gov (United States)

Saccharomyces cerevisiae Rim101 is a member of the fungal PacC family of transcription factors involved in the response to alkaline pH stress. Further studies have also implicated Rim101 in the responses to other stresses, and have shown its genetic interaction with the iron deprivation-responsive factor Aft1. The present study shows that the absence of Rim101 leads to hypersensitivity to oxidants such as t-butyl hydroperoxide and diamide, and also to the prooxidant agent selenite. The protective role of Rim101 against selenite requires the sensing complex component Rim8, the ESCRT-I/II/III complexes and the Rim13 protease involved in proteolytic activation of Rim101. The Nrg1 transcriptional repressor is a downstream effector of Rim101 in this response to selenite, as occurs in the responses to alkaline pH, Na(+) and Li(+) stresses. Deletion of RIM101 causes downregulation of the vacuolar ATPase genes VMA2 and VMA4, which becomes accentuated compared to wild type cells upon selenite stress, and activation of the Rim101 protein prevents inhibition of vacuolar acidification caused by selenite. These observations therefore support a role of Rim101 in modulation of vacuolar acidity necessary for selenite detoxification. In addition, a parallel Rim101-independent pathway requiring the complete ESCRT machinery (including the ESCRT-0 complex) also participates in protection against selenite. PMID:25239548

Pérez-Sampietro, Maria; Herrero, Enrique

2014-10-01

186

49 CFR 571.110 - Tire selection and rims and motor home/recreation vehicle trailer load carrying capacity...  

Science.gov (United States)

...2010-10-01 false Tire selection and rims and motor home/recreation vehicle trailer...Standards § 571.110 Tire selection and rims and motor home/recreation vehicle trailer...passenger vehicles. Non-pneumatic rim is used as defined in § 571.129....

2010-10-01

187

76 FR 55708 - Servicing Multi-Piece and Single Piece Rim Wheels; Extension of the Office of Management and...  

Science.gov (United States)

...Servicing Multi-Piece and Single Piece Rim Wheels; Extension of the Office of Management...Servicing Multi-Piece and Single Piece Rim Wheels (29 CFR 1910.177). The paperwork...Servicing Multi- Piece and Single Piece Rim Wheels (29 CFR 1910.177). OSHA is...

2011-09-08

188

76 FR 14697 - Aleris Blanking and Rim Products, Inc., a Division of Aleris International, Inc., Terre Haute, IN...  

Science.gov (United States)

...TA-W-72,041] Aleris Blanking and Rim Products, Inc., a Division of Aleris...determine that workers of Aleris Blanking and Rim Products, Inc., a division of Aleris...certification: All workers of Aleris Blanking and Rim Products, Inc., a division of...

2011-03-17

189

Space weathered rims found on the surfaces of the Itokawa dust particles  

Science.gov (United States)

On the basis of observations using Cs-corrected STEM, we identified three types of surface modification probably formed by space weathering on the surfaces of Itokawa particles. They are (1) redeposition rims (2-3 nm), (2) composite rims (30-60 nm), and (3) composite vesicular rims (60-80 nm). These rims are characterized by a combination of three zones. Zone I occupies the outermost part of the surface modification, which contains elements that are not included in the unchanged substrate minerals, suggesting that this zone is composed of sputter deposits and/or impact vapor deposits originating from the surrounding minerals. Redeposition rims are composed only of Zone I and directly attaches to the unchanged minerals (Zone III). Zone I of composite and composite vesicular rims often contains nanophase (Fe,Mg)S. The composite rims and the composite vesicular rims have a two-layered structure: a combination of Zone I and Zone II, below which Zone III exists. Zone II is the partially amorphized zone. Zone II of ferromagnesian silicates contains abundant nanophase Fe. Radiation-induced segregation and in situ reduction are the most plausible mechanisms to form nanophase Fe in Zone II. Their lattice fringes indicate that they contain metallic iron, which probably causes the reddening of the reflectance spectra of Itokawa. Zone II of the composite vesicular rims contains vesicles. The vesicles in Zone II were probably formed by segregation of solar wind He implanted in this zone. The textures strongly suggest that solar wind irradiation damage and implantation are the major causes of surface modification and space weathering on Itokawa.

Noguchi, Takaaki; Kimura, Makoto; Hashimoto, Takahito; Konno, Mitsuru; Nakamura, Tomoki; Zolensky, Michael E.; Okazaki, Ryuji; Tanaka, Masahiko; Tsuchiyama, Akira; Nakato, Aiko; Ogami, Toshinori; Ishida, Hatsumi; Sagae, Ryosuke; Tsujimoto, Shinichi; Matsumoto, Toru; Matsuno, Junya; Fujimura, Akio; Abe, Masanao; Yada, Toru; Mukai, Toshifumi; Ueno, Munetaka; Okada, Tatsuaki; Shirai, Kei; Ishibashi, Yukihiro

2014-02-01

190

Bone poroelasticity.  

Science.gov (United States)

Poroelasticity is a well-developed theory for the interaction of fluid and solid phases of a fluid-saturated porous medium. It is widely used in geomechanics and has been applied to bone by many authors in the last 30 years. The purpose of this work is, first, to review the literature related to the application of poroelasticity to the interstitial bone fluid and, second, to describe the specific physical and modeling considerations that establish poroelasticity as an effective and useful model for deformation-driven bone fluid movement in bone tissue. The application of poroelasticity to bone differs from its application to soft tissues in two important ways. First, the deformations of bone are small while those of soft tissues are generally large. Second, the bulk modulus of the mineralized bone matrix is about six times stiffer than that of the fluid in the pores while the bulk moduli of the soft tissue matrix and the pore water are almost the same. Poroelasticity and electrokinetics can be used to explain strain-generated potentials in wet bone. It is noted that strain-generated potentials can be used as an effective tool in the experimental study of local bone fluid flow, and that the knowledge of this technique will contribute to the answers of a number of questions concerning bone mineralization, osteocyte nutrition and the bone mechanosensory system. PMID:10093022

Cowin, S C

1999-03-01

191

Intraosseous ganglion cyst of the capitate treated by intralesional curettage, autogenous bone marrow graft and autogenous fibrin clot graft.  

Science.gov (United States)

We report a very rare case of intraosseous ganglion cyst of the capitate in a 54-year-old female who complained of a painful right wrist mass for 1 year. Computed tomography study showed an expansile osteolytic lesion with sclerotic margin and thinning of the cortex. Combined soft tissue ganglion cyst was also noted at operation and confirmed by pathologic study. The case was treated by a new method of autogenous bone marrow and fibrin clot graft after intralesional curettage. After a 2-year follow-up, the capitate revealed complete bony union and the symptoms were relieved with good functional results. PMID:17525002

Chen, Ying-Chieh; Wang, Shyu-Jye; Shen, Pei-Hung; Huang, Guo-Shu; Lee, Herng-Sheng; Wu, Shing-Sheng

2007-05-01

192

Indentifying dikes in the eastern Hellas rim region, Mars  

Science.gov (United States)

Abstract The Hadriaca Patera (HP) volcano [e.g. 1-9] on Mars is situated on the north-easten rim of the giant Hellas impact basin, and on the western edge of the vast volcanic plains of Hesperia Planum [10, 11]. The eastern Hellas rim region harbours also other, possibly separate centers of volcanism that have only recently been proposed [12, 13]. The area is additionally characterized by a multitude of fluvial features, extending from small, partly dendritic channel networks (e.g 14-16, references therein) to vast, several km deep and hundreds of km long outflow valleys (e.g. 14, 16-19, references therein). The origins of the latter type have been theorized to be in volcanism and creation of sills and dikes beneath or near the channel heads [7, 19]. The Hesperia-Hellas region also shows evidence of even more significant volatile erosion prior to the formation of the outflow channels, also induced by endogenic activity [20]. We study a roughly 1200-km wide region around the HP volcano in search of real-life dike-indicative formations [for details and more discussion, see 21]. The origin and distribution of the dikes in the east Hellas region is of importance when discussing the regional geology, and especially when attempting to synthesize a chronology and causal relationships between regional events such as outflow channel formation. The dike patterns and sizes are related to the whereabouts and characteristics of their feeding magma bodies. Thus, the dike distribution around HP gives a hint about the heat flux in the region. This reflects on the possible formation scenarios of e.g. the outflow channels near HP as well as the formation of the several floor-fractured craters in the NE Hellas region. We have identified and documented a large number of straight/curvilinear ridges, fractures and grabens on the volcano itself, on its flanks, and on the whole eastern Hellas rim region. The best candidates for actual dike manifestations include e.g. transitions from linear fractures or grabens to linear ridges as well as grabens harbouring narrow ridges on their floors. Most dike candidates near HP are either radial or concentric to the volcano, indicating a causal relationship. However, many clusters farther away appear not to have been controlled directly by any HPrelated magma reservoirs. The existence of the latter kind hint towards regions of separate - and so far unrecognized - magmatic centres, and may thus help put together e.g. the long-disputed formation scenarios of the outflow channels adjacent to them. Acknowledgements We would like to thank Prof. Dr. H. Hiesinger for his imput in compiling this work. Funding for the work was provided by Alfred Kordelin foundation, and attending this meeting would not have been possible without the graciousness of the University of Oulu rector, Dr. L. Lajunen. References [1] Plescia, J. (2004) JGR, 109, E03003. [2] Gulick, V.C. & Baker, V.R. (1990) JGR, 95, 14325- 14344. [3] Crown, D. (1991) Ph.D. Thesis, ASU, Tempe, AZ. [4] Plescia, J.B. & Saunders, R.S. (1979) LPSCP. X, 2841- 2859. [5] Greeley, R. & Spudis, P.D. (1981) RevGeopSpacPhys, 19, 13-41. [6] Greeley, R. & Crown, D. (1990) JGR, 95, 7133-7149. [7] Crown, D. & Greeley, R. (1993) JGR, 98, 3431-3451. [8] Byrnes, J.M. & deSilva, S.L. (2003) LPSC XXXIV, 1175. [9] Gregg, T. & Williams, S.N. (1993) LPSC XXIV, 575-576. [10] Greeley, R. & Guest, J. (1987) USGS map, I-1802-B. [11] Leonard, G.J. & Tanaka, K.L. (2001) USGS map, I- 2694. [12] van Gasselt, S. et al. (2007) JGR 112, E9, E09006. [13] Kostama et al. (2007) 7th Mars Conf., LPI Contrib. 1353, 3308. [14] Carr, M.H. (1996) Water on Mars. [15] Cabrol, N.A. & Grin, E.A. (2001) Geomorphology, 37, 269-287. [16] Crown, D.A. et al. (2005) JGR, 110, E12S22. [17] Carr, M.H. & Schaber, G.G. (1977) JGR, 82, 4039- 4054. [18] Crown, D.A. et al. (1992) Icarus, 100, 1-25. [19] Kostama, V.-P. et al. (2008) LPSC XXXIX, #2018. [20] Ivanov, M. I. et al. (2005) JGR, 110, E12S21. [21] Korteniemi, J. et al. (2008) LPSC XXXIX, #1829.

Korteniemi, J.; Raitala, J.; Kostama, V.-P.; Aittola, M.; Hyvärinen, M.

2008-09-01

193

{sup 99m}Tc-MDP pinhole bone scintigraphic feature of fibrovascular zone: a new diagnostic sign of osteoid osteoma  

Energy Technology Data Exchange (ETDEWEB)

Osteoid osteoma is a common benign tumor. Histologically, the tumor is characterized by the presence of the nidus, fibrovascular zone (FVZ) and reactive host bone scleroses of various intensities. A nidus consists of core meshwork of osteoid trabeculae, woven bone and osteoblastic rim and a FVZ, 1-2 mm rim, is composed of loose fibrovascular tissue and nerve fibers. The nidus and FVZ are readily identifiable on pathological specimen and CT when sclerosis is not too extensive. Recently on pinhole bone scan, we observed a peculiar rim sign that denoted FVZ in a patient with pathologically proven osteoid osteoma. Not previously described the sign appears to be pathognomonic of osteoid osteoma, uniquely providing metabolic information. The finding was correlated with that of radiography, CT and MRI and low power light microscopy.

Bahk, Yong Whee [Sung Ae Hospital, Seoul (Korea, Republic of); Kim, Sung Hoon; Choi, Yeong Jin [Catholic University Medical School, Seoul (Korea, Republic of)

2007-02-15

194

Bone metastases as the presenting manifestation of rhabdomyosarcoma in childhood  

Energy Technology Data Exchange (ETDEWEB)

Rarely, rhabdomyosarcoma can present with bone pain and bone lesions on radiographs without evidence of a primary tumor. Of 428 children with biopsy-proven rhabdomyosarcoma, four presented with radiographic evidence of bone metastases, but no primary tumor was found on subsequent evaluation. On radiographs, these metastases, located most commonly in the metaphyses of the extremities and in the spine, displayed a destructive or diffusely permeative pattern without sclerotic margins and mimicked the more common neuroblastoma. One patient also had diaphyseal cortical lytic metastases of the tibia. Radiographs defined metastases of the extremities better than the correlative bone scans. In the spine, on T2-weighted magnetic resonance (MR) images, metastases displayed high signal intensity which contrasted with the low-signal-intensity marrow in these pediatric patients. On histopathologic examination, metastatic rhabdomyosarcoma was composed of small cells of variable size, shape, and growth pattern similar to other round cell tumors. A positive desmin immunohistochemical test helped to establish the diagnosis. The radiologist, pathologist, and clinician should be aware of this unusual presentation of rhabdomyosarcoma so that suitable immunohistochemical tests are performed and appropriate chemotherapy given. (orig.)

Shapeero, L.G. (Dept. of Radiology, Inst. Gustave-Roussy, Villejuif (France) Dept. of Radiology, California Univ., San Francisco, CA (United States)); Couanet, D. (Dept. of Radiology, Inst. Gustave-Roussy, Villejuif (France)); Vanel, D. (Dept. of Radiology, Inst. Gustave-Roussy, Villejuif (France)); Ackerman, L.V. (Dept. of Pathology, State Univ., Stony Brook, NY (United States)); Terrier-Lacombe, M.J. (Dept. of Pathology, Inst. Gustave-Roussy, Villejuif (France)); Flamant, F. (Dept. of Pediatrics, Inst. Gustave-Roussy, Villejuif (France)); Contesso, G. (Dept. of Pathology, Inst. Gustave-Roussy, Villejuif (France)); Lumbroso, J. (Dept. of Nuclear Medicine, Inst. Gustave-Roussy, Villejuif (France))

1993-08-01

195

CT Guided Bone Biopsy Using a Battery Powered Intraosseous Device  

Energy Technology Data Exchange (ETDEWEB)

Purpose: To evaluate the feasibility of a battery powered intraosseous device to perform CT-fluoroscopy guided bone biopsy. Methods: Retrospective analysis of 12 patients in whom bone specimen were acquired from different locations under CT-fluoroscopy guidance using the OnControl bone marrow biopsy system (OBM, Vidacare, Shavano Park, TX, USA). Data of the 12 were compared to a historic cohort in whom the specimen were acquired using the classic Jamshidi Needle, as reference needle using manual force for biopsy. Results: Technical success was reached in 11 of 12 cases, indicated by central localisation of the needle within the target lesion. All specimen sampled were sufficient for histopathological workup. Compared to the historical cohort the time needed for biopsy decreased significantly from 13 {+-} 6 to 6 {+-} 4 min (P = 0.0001). Due to the shortened intervention time the radiation dose (CTDI) during CT-fluoroscopy was lowered significantly from 169 {+-} 87 to 111 {+-} 54 mGy Multiplication-Sign cm (P = 0.0001). Interventional radiologists were confident with the performance of the needle especially when using in sclerotic or osteoblastic lesions. Conclusion: The OBM is an attractive support for CT-fluoroscopy guided bone biopsy which is safe tool and compared to the classical approach using the Jamshidi needle leading to significantly reduced intervention time and radiation exposure.

Schnapauff, Dirk, E-mail: dirk.schnapauff@charite.de; Marnitz, Tim, E-mail: tim.marnitz@charite.de; Freyhardt, Patrick, E-mail: Patrick.freyhardt@charite.de; Collettini, Federico, E-mail: Federico.collettini@charite.de [Charite Universitaetsmedizin Berlin, Campus Virchow-Klinikum, Department of Radiology (Germany); Hartwig, Kerstin, E-mail: kerstin.hartwig@charite.de [Charite Universitaetsmedizin Berlin, Campus Charite Mitte, Department of Haematology and Oncology (Germany); Joehrens, Korinna, E-mail: korinna.joehrens@charite.de [Charite Universitaetsmedizin Berlin, Campus Charite Mitte, Department of Pathology (Germany); Hamm, Bernd, E-mail: bernd.hamm@charite.de; Kroencke, Thomas, E-mail: thomas.kroencke@charite.de; Gebauer, Bernhard, E-mail: Bernhard.gebauer@charite.de [Charite Universitaetsmedizin Berlin, Campus Virchow-Klinikum, Department of Radiology (Germany)

2013-10-15

196

CT Guided Bone Biopsy Using a Battery Powered Intraosseous Device  

International Nuclear Information System (INIS)

Purpose: To evaluate the feasibility of a battery powered intraosseous device to perform CT-fluoroscopy guided bone biopsy. Methods: Retrospective analysis of 12 patients in whom bone specimen were acquired from different locations under CT-fluoroscopy guidance using the OnControl bone marrow biopsy system (OBM, Vidacare, Shavano Park, TX, USA). Data of the 12 were compared to a historic cohort in whom the specimen were acquired using the classic Jamshidi Needle, as reference needle using manual force for biopsy. Results: Technical success was reached in 11 of 12 cases, indicated by central localisation of the needle within the target lesion. All specimen sampled were sufficient for histopathological workup. Compared to the historical cohort the time needed for biopsy decreased significantly from 13 ± 6 to 6 ± 4 min (P = 0.0001). Due to the shortened intervention time the radiation dose (CTDI) during CT-fluoroscopy was lowered significantly from 169 ± 87 to 111 ± 54 mGy × cm (P = 0.0001). Interventional radiologists were confident with the performance of the needle especially when using in sclerotic or osteoblastic lesions. Conclusion: The OBM is an attractive support for CT-fluoroscopy guided bone biopsy which is safe tool and compared to the classical approach using the Jamshidi needle leading to significantly reduced intervention time and radiation exposure

197

Bone Lesions and Damage  

Science.gov (United States)

... NOW Home » About Multiple Myeloma » Symptoms » Bone Damage Bone Lesions and Damage Bone lesions from multiple myeloma ... have some degree of bone loss. Causes of bone destruction in myeloma Normally, osteoclasts function with bone- ...

198

Search Efficient Representation of Healthcare Data based on the HL7 RIM  

Directory of Open Access Journals (Sweden)

Full Text Available The Reference Information Model (RIM of Health Level Seven (HL7 standard is a conceptual information model for health care. Data of HL7 RIM Observation class are sparse, high dimensional, and require frequent schema change. Entity Attribute Value (EAV is the widely used solution to handle these above challenges of medical data, but EAV is not search efficient for knowledge extraction. In this paper, we have proposed a search efficient data model:  Optimized Entity Attribute Value (OEAV for physical representation of medical data as alternative of widely used EAV model. We have implemented EAV or OEAV individually to model RIM Observation class and used relational model for the remaining RIM classes. We have shown that OEAV is dramatically search efficient   and occupy less storage space compared to EAV.

Razan Paul

2010-12-01

199

Bright-rimmed molecular cloud around S140 IRS. I. CS (J = 1-0) observations  

International Nuclear Information System (INIS)

The bright-rimmed molecular cloud around S140 IRS has been mapped in the CS (J = 1-0) emission with an angular resolution of 33''. The relation between the CS emission and the distance from the ionization front is discussed, based on the position of the optical rim determined from an H? photograph. The CS intensity decreases rapidly like a step function toward the rim. The step lies 40'' away from the optical rim. The distribution of the CS emission in the vicinity of S140 IRS shows a barlike east-west elongation which is prominent at V/sub LSR/ = -6 km s-1, and an archlike structure clearly seen at V/sub LSR/ = -8 km s-1

200

The Anatomy and Bulk Composition of CAI Rims in the Vigarano (CV3) Chondrite  

Science.gov (United States)

A striking feature of Ca,Al-rich inclusions (CAIs) in chondrites is the presence of mineralogical layers that typically form rim sequences up to 50 micrometers thick [1]. Many ideas regarding the origin of CAI rims have been proposed, but none are entirely satisfactory. The detailed mineralogy and bulk compositions of relatively unaltered CAI rims in the Vigarano (CV3) chondrite described here provide constraints on hypotheses of rim formation. Rim Mineralogy: CAIs in Vigarano consist of melilite (mel)- and spinel (sp)- rich varieties, both of which are rimmed [2]. Around mel-rich objects, the layer sequence is CAI interior --> sp-rich layer (sometimes absent) --> mel/anorthite (anor) layer --> Ti-Al-rich clinopyroxene (Tpx) layer --> Al- diopside (Al-diop) layer --> olivine (ol) +/- Al-diop layer --> host matrix. The sequence around sp-rich objects differs from this in that the mel/anor layer is absent. Both the sp-rich layer around mel-cored CAIs and the cores of sp-rich CAIs in Vigarano are largely comprised of a fine-grained (gehlenitic than mel in the CAI interiors, especially compared to mel in the interior adjacent to the rims. The Tpx layer (>2 and up to 15 wt% TiO2) and Al-diop layer (gehlenite-anorthite-forsterite ternary diagram of Stolper [3], and are unattainable by the igneous crystallization of a mel-rich CAI composition. Moreover, a hypothetical melt with the composition of the rims has a predicted crystallization sequence (sp --> sp + fo --> sp + fo + anor or mel or Tpx) that does not correspond to observed rim sequences. It thus appears that (1) the rim region did not form through crystallization of molten CAIs; and (2) rim layers did not originate solely by the crystallization of a melt layer present on a solid CAI core [4,5]. References: [1] Wark D. A. and Lovering J. F. (1977) Proc. LSC 8th, 95-112. [2] Ruzicka A. and Boynton W. V. (1991) Meteoritics, 26, 390-391. [3] Stolper E. (1982) GCA, 46, 2159-2180. [4] Korina M. I. et al. (1982) LPS XIII, 399- 400. [5] Bunch T. E. and Chang S. (1980) Meteoritics, 15, 270- 271.

Ruzicka, A.; Boynton, W. V.

1993-07-01

 
 
 
 
201

Ruthenium concentrations in geological boundary deposits and their correlation with Iridium by RIMS  

International Nuclear Information System (INIS)

The reason the biological mass extinctions in the earth history is a great concern of geologists. A method using RIMS to determine the concentration of Ru has been developed. The Ru/Ir concentration ratios favour the impact model of extraterrestrial material on the earth to explain the dinosaur extinction at the end of the Cretaceous. This is the first data on Ru abundances in geological boundary deposits analyzed by RIMS

202

Metallurgical analysis of rim cracking in an lp steam turbine disc  

International Nuclear Information System (INIS)

An investigation of the nature of in-service cracking in LP turbine rotors encountered in a PWR nuclear power plant was performed. The investigation was based on a metallurgical evaluation of disc rim samples from one of the two rotors involved. The program included a detailed magnetic particle inspection of the rim samples, in-depth metallographic and fractographic examinations of cracked blade attachment steeples and chemical analyses of the disc material

203

Resurfacing monoblock of steel R7T wheel rims (MBW for the train wagons  

Directory of Open Access Journals (Sweden)

Full Text Available The steel R7T monoblock wheel material properties are defined by the International Declaration UIC 812-3. Taking into consideration the resurfacing of the rim, the analyzed conditions for the resurfacing, as well as the analysis of the chemical compounds, mechanical characteristics (material hardness, pulling strength, and tenacity, ultrasound and metallographic testing, which proved that the resurfaced rim area has the required characteristics, according to the Declaration UIC 812-3.

V. Vukovi?

2011-04-01

204

Rim formation is not a prerequisite for distribution of cone photoreceptor outer segment proteins.  

Science.gov (United States)

Retinal degeneration slow (RDS/PRPH2) is critical for the formation of the disc/lamella rim in photoreceptor outer segments (OSs), but plays a different role in rods vs. cones. Without RDS, rods fail to form OSs, however, cones lacking RDS (in the rds(-/-)/Nrl(-/-)) exhibit balloon-like OSs devoid of lamellae. We show that distribution of most proteins in the lamella and PM domains is preserved even in the absence of RDS, rim, and lamella structures. However, the rim protein prominin-1 exhibits altered trafficking and OS localization, suggesting that proper targeting and distribution of rim proteins may require RDS. Our ultrastructural studies show that in cones, OS formation is initiated by the growth of opsin-containing membrane with RDS-mediated rim formation as a secondary step. This is directly opposite to rods and significantly advances our understanding of the role of the rim in cone OS morphogenesis. Furthermore, our results suggest that the unique folded lamella architecture of the cone OS may maximize density or proximity of phototransduction proteins, but is not required for OS function or for protein distribution and retention in different membrane domains. PMID:24736412

Conley, Shannon M; Al-Ubaidi, Muayyad R; Han, Zongchao; Naash, Muna I

2014-08-01

205

Noachian Impact Breccias on the Rim of Endeavour Crater, Mars: Opportunity APXS Results  

Science.gov (United States)

Mars Exploration Rover Opportunity has been investigating the geology of Meridiani Planum since January 2004, and is currently approx. 3830% into its primary mission. Opportunity reached the rim of 22 km diameter Endeavor crater at Spirit Point on the south end of Cape York on sol 2681 and began exploring the geology of Endeavour rim. She left Cape York on sol 3316 and arrived at the next rim remnant to the south, Solander Point, on sol 3387 to begin geological investigations at the contact and up onto Murray Ridge. The Burns fm. of Meridiani Planum lies near the top of the plains-forming unit of western Sinus Meridiani and onlaps onto the Endeavour rim rocks (hereafter rim rocks). Endeavour crater would have excavated approx. 4 km into the existing stratigraphy. Thus, the ejecta that form the rim rocks offer windows into the deeper lithologies of Sinus Meridiani. Here we discuss the polymict breccias of the Shoemaker fm. on Cape York and the breccias from Murray Ridge, with a focus on compositions determined by the Alpha Particle X-Ray Spectrometer (APXS).

Mittlefehldt, D. W.; Gellert, R.; Arvidson, R. E.; Bell, J. F., III; Farrand, W. H.; Herkenhoff, K. E.; Jolliff, B. L.; Ming, D. W.; Schroeder, C.; Sullivan, R. J.

2014-01-01

206

Magnetic Field Amplification in the Thin X-Ray Rims of SN 1006  

Science.gov (United States)

Several young supernova remnants, including SN 1006, emit synchrotron X-rays in narrow filaments, hereafter thin rims, along their periphery. The widths of these rims imply 50-100 ?G fields in the region immediately behind the shock, far larger than expected for the interstellar medium compressed by unmodified shocks, assuming electron radiative losses limit rim widths. However, magnetic field damping could also produce thin rims. Here we review the literature on rim width calculations, summarizing the case for magnetic field amplification. We extend these calculations to include an arbitrary power-law dependence of the diffusion coefficient on energy, DvpropE ?. Loss-limited rim widths should shrink with increasing photon energy, while magnetic-damping models predict widths almost independent of photon energy. We use these results to analyze Chandra observations of SN 1006, in particular the southwest limb. We parameterize the FWHM in terms of energy as FWHM \\propto E^{m_E}_{\\gamma }. Filament widths in SN 1006 decrease with energy; mE ~ -0.3 to -0.8, implying magnetic field amplification by factors of 10-50, above the factor of four expected in strong unmodified shocks. For SN 1006, the rapid shrinkage rules out magnetic damping models. It also favors short mean free paths (small diffusion coefficients) and strong dependence of D on energy (? >= 1).

Ressler, Sean M.; Katsuda, Satoru; Reynolds, Stephen P.; Long, Knox S.; Petre, Robert; Williams, Brian J.; Winkler, P. Frank

2014-08-01

207

Magnetic-Field Amplification in the Thin X-ray Rims of SN1006  

CERN Document Server

Several young supernova remnants (SNRs), including SN1006, emit synchrotron X-rays in narrow filaments, hereafter thin rims, along their periphery. The widths of these rims imply 50 to $100 \\mu$G fields in the region immediately behind the shock, far larger than expected for the interstellar medium compressed by unmodified shocks, assuming electron radiative losses limit rim widths. However, magnetic-field damping could also produce thin rims. Here we review the literature on rim width calculations, summarizing the case for magnetic-field amplification. We extend these calculations to include an arbitrary power-law dependence of the diffusion coefficient on energy, $D \\propto E^{\\mu}$. Loss-limited rim widths should shrink with increasing photon energy, while magnetic-damping models predict widths almost independent of photon energy. We use these results to analyze Chandra observations of SN 1006, in particular the southwest limb. We parameterize the full widths at half maximum (FWHM) in terms of energy as FW...

Ressler, Sean M; Reynolds, Stephen P; Long, Knox S; Petre, Robert; Williams, Brian J; Winkler, P Frank

2014-01-01

208

Bendy Bones  

Science.gov (United States)

In this activity (on pages 19-24 of PDF), learners soak chicken bones or eggshells in vinegar for several days. Learners observe what happens to the material as the acid dissolves the calcium that provides the strength to the material. The lesson includes information about calcium, calcium-rich foods that keep bones strong, and an explanation of how the acidic vinegar solution causes the bone or eggshell to become weak.

Omsi

2004-01-01

209

Outline of norbornene resin-application to RIM (reaction injection molding); Shinki noborunen jushi no tokusei to RIM seikei eno oyo  

Energy Technology Data Exchange (ETDEWEB)

The reaction injection molding (RIM) is the molding system that two kinds of monomers each of which is low viscous and high reactive liquid are mixed and then immediately injected into a mold. Though the RIM has been developed already for urethane, urea resin, nylon, epoxy resin and polyester, this writer explained about the RIM for norbornene resin which has been developed and produced by the firm to which he belongs. Norbornene monomers are cyclopentadiene (CPD) which can be obtained by cracking of naphtha and its dimer, dicyclopentadiene (DCP), and these are possible to form bridging polymer by the ring-opening polymerization with the help of catalyst (WCl6) and its activator (Et2AlCl). The TIM system which is the leading injection molding for thermoplastic resin being suitable for mass production, and on the other hand, the HLU (hand-lay up) system which developed as molding system for large-sized mold goods being handwork-centered system, it can be said that the RIM system is situated in the middle position among these systems from the viewpoint of productivity. 2 refs., 10 figs., 1 tab.

Nakano, M. [Nippon Zeon Co., Ltd., Tokyo (Japan)

1996-04-01

210

Pacific Rim: A Simulation of a Race through the Western Pacific Rim Countries, Developing Awareness of Their Lands, Peoples, and Customs.  

Science.gov (United States)

This simulation allows students to learn about the lands and customs of the people living in the countries found along the western rim of the Pacific Ocean. The class is divided into eight teams. The phases of the unit include: (1) research; (2) activities; (3) race; and (4) summing up and festival. Each stage of play involves completion of tasks…

Plantz, Connie; Callis, Janette M.

211

Systemic mastocytosis (SM) and associated malignant bone marrow histiocytosis - a hitherto undescribed form of SM-AHNMD.  

Science.gov (United States)

An elderly woman presented with anaemia, thrombocytopenia and multifocal lytic and sclerotic bone lesions. Trephine bone marrow biopsy demonstrated widespread involvement by systemic mastocytosis (SM). The neoplastic mast cells expressed mast cell tryptase, CD117, CD25 and CD9, and were accompanied by compact sheets of atypical large histiocytic cells, expressing CD68, CD4, S-100 protein and CD14, in keeping with a concomitant histiocytosis (SM-AHNMD). Mutation analysis revealed the activating point mutation D816V of the c-kit proto-oncogene in microdissected pooled bone marrow mast cells. Partial remission was achieved using interferon alpha. To the best of our knowledge this is the first reported case of SM-AHNMD with histiocytosis as the non-mast cell component. PMID:21866466

Rudzki, Zbigniew; Sotlar, Karl; Kudela, Andrzej; Starzak-Gwó?d?, Jolanta; Horny, Hans-Peter

2011-01-01

212

Ossificans myositis: inflammatory changes and contrast enhancement of adjacent bone shown by MR imaging  

International Nuclear Information System (INIS)

The authors report a case of ossificans myositis, in which magnetic resonance imaging (MRI) showed inflammatory changes of the adjacent bone. T 1 weighted fat saturation sequence with gadolinium injection showed enhancement of medullary and cortical bone. This potentially mistaking pattern must be known, to avoid mis diagnosing with malignant osseous tumor, specially before achievement of the characteristic pattern of zonal maturation and its calcified rim. (authors). 15 refs., 6 figs

213

99mTc MDP bone scan in evaluation of painful scoliosis  

International Nuclear Information System (INIS)

A 18-year-old male presented with low back ache. The patient was investigated and was diagnosed to have painful scoliosis. X-ray and other examinations could not reveal any diagnosis. The patient was referred to undergo bone scan on clinical suspicion of osteoid osteoma and to rule out stress fracture if any. Planar bone scan was performed, which showed a lesion in L3 vertebra and was further evaluated with SPECT (Single photon emission computed tomography) study to characterize the lesion. On SPECT examination, the classical features of osteoid osteoma, the double density sign (11), was noted in the pars interarticularis region. These findings were confirmed by a CT scan, which showed a sclerotic lesion in pars interarticularis of L3 vertebra. The patient was posted for operation and was relieved of symptoms in the postoperative follow-up. (author)

214

Computed tomography of temporal bone pneumatization. 1. Normal pattern and morphology  

International Nuclear Information System (INIS)

The pneumatization of 141 normal temporal bones on computed tomography (CT) was evaluated in 100 patients. Because of the controversy surrounding the sclerotic squamomastoid (mastoid), temporal bones with this finding were discarded. A CT index of pneumatization was based on the pneumatized area and the number of cells seen within a representative scanning section. Results suggest that squamomastoid pneumatization follows the classic normal distribution and does not correlate with age, gender, or laterality. A high degree of symmetry was found in 41 patients who had both ears examined. Air-cell configuration was variable. Air-cell size tended to increase progressively from the mastoid antrum. The scutum pseudotumor appearance caused by incomplete pneumatization was seen frequently, and should not be mistaken for mastoiditis or an osteoma. Thick sections producing partial-volume effect may also produce this spurious finding. Therefore, when searching for mucosal thickening due to mastoiditis, large air cells should preferably be analyzed

215

PET/MR imaging of bone lesions - implications for PET quantification from imperfect attenuation correction  

International Nuclear Information System (INIS)

Accurate attenuation correction (AC) is essential for quantitative analysis of PET tracer distribution. In MR, the lack of cortical bone signal makes bone segmentation difficult and may require implementation of special sequences. The purpose of this study was to evaluate the need for accurate bone segmentation in MR-based AC for whole-body PET/MR imaging. In 22 patients undergoing sequential PET/CT and 3-T MR imaging, modified CT AC maps were produced by replacing pixels with values of >100 HU, representing mostly bone structures, by pixels with a constant value of 36 HU corresponding to soft tissue, thereby simulating current MR-derived AC maps. A total of 141 FDG-positive osseous lesions and 50 soft-tissue lesions adjacent to bones were evaluated. The mean standardized uptake value (SUVmean) was measured in each lesion in PET images reconstructed once using the standard AC maps and once using the modified AC maps. Subsequently, the errors in lesion tracer uptake for the modified PET images were calculated using the standard PET image as a reference. Substitution of bone by soft tissue values in AC maps resulted in an underestimation of tracer uptake in osseous and soft tissue lesions adjacent to bones of 11.2 ± 5.4 % (range 1.5-30.8 %) and 3.2 ± 1.7 % (range 0.2-4 %), respectively. Analysis of the spine and pelvic osseous lesions revealed a substantial dependence of the error on lesion composition. For predominantly sclerotic spine lesions, the mean underestimation was 15.9 ± 3.4 % (range 9.9-23.5 %) and for osteolytic spine lesions, 7.2 ± 1.7 % (range 4.9-9.3 %), respectively. CT data simulating treating bone as soft tissue as is currently done in MR maps for PET AC leads to a substantial underestimation of tracer uptake in bone lesions and depends on lesion composition, the largest error being seen in sclerotic lesions. Therefore, depiction of cortical bone and other calcified areas in MR AC maps is necessary for accurate quantification of tracer uptake values in PET/MR imaging. (orig.)

216

PET/MR imaging of bone lesions - implications for PET quantification from imperfect attenuation correction  

Energy Technology Data Exchange (ETDEWEB)

Accurate attenuation correction (AC) is essential for quantitative analysis of PET tracer distribution. In MR, the lack of cortical bone signal makes bone segmentation difficult and may require implementation of special sequences. The purpose of this study was to evaluate the need for accurate bone segmentation in MR-based AC for whole-body PET/MR imaging. In 22 patients undergoing sequential PET/CT and 3-T MR imaging, modified CT AC maps were produced by replacing pixels with values of >100 HU, representing mostly bone structures, by pixels with a constant value of 36 HU corresponding to soft tissue, thereby simulating current MR-derived AC maps. A total of 141 FDG-positive osseous lesions and 50 soft-tissue lesions adjacent to bones were evaluated. The mean standardized uptake value (SUVmean) was measured in each lesion in PET images reconstructed once using the standard AC maps and once using the modified AC maps. Subsequently, the errors in lesion tracer uptake for the modified PET images were calculated using the standard PET image as a reference. Substitution of bone by soft tissue values in AC maps resulted in an underestimation of tracer uptake in osseous and soft tissue lesions adjacent to bones of 11.2 {+-} 5.4 % (range 1.5-30.8 %) and 3.2 {+-} 1.7 % (range 0.2-4 %), respectively. Analysis of the spine and pelvic osseous lesions revealed a substantial dependence of the error on lesion composition. For predominantly sclerotic spine lesions, the mean underestimation was 15.9 {+-} 3.4 % (range 9.9-23.5 %) and for osteolytic spine lesions, 7.2 {+-} 1.7 % (range 4.9-9.3 %), respectively. CT data simulating treating bone as soft tissue as is currently done in MR maps for PET AC leads to a substantial underestimation of tracer uptake in bone lesions and depends on lesion composition, the largest error being seen in sclerotic lesions. Therefore, depiction of cortical bone and other calcified areas in MR AC maps is necessary for accurate quantification of tracer uptake values in PET/MR imaging. (orig.)

Samarin, Andrei [University Hospital of Zurich, Department of Medical Radiology, Zurich (Switzerland); University Hospital Zurich, Nuclear Medicine, Zurich (Switzerland); Burger, Cyrill; Crook, David W.; Burger, Irene A.; Schmid, Daniel T.; Schulthess, Gustav K. von; Kuhn, Felix P. [University Hospital of Zurich, Department of Medical Radiology, Zurich (Switzerland); Wollenweber, Scott D. [GE Healthcare, Waukesha, WI (United States)

2012-07-15

217

Behaviour of a rimmed elliptical inclusion in 2D slow incompressible viscous flow  

Science.gov (United States)

The shape preferred orientation of natural populations of inclusions (or "porphyroclasts") is often inconsistent with predictions from established analytical theory for inclusions with coherent boundaries (e.g., Pennacchioni et al. 2001). A totally incoherent or slipping interface can explain observed stable back-rotated (or antithetic) orientations but not the observed cut-off axial ratio, below which inclusions still rotate. However, this behaviour is reproduced by a rimmed inclusion with a rim viscosity that is not infinitely weak but still weaker than the matrix (e.g., Schmid and Podladchikov 2005; Johnson et al. 2009). In this study, finite-element numerical modelling (FEM) is employed to investigate this system in 2D over a very wide parameter space, from a viscosity ratio (relative to the matrix) of the inclusion from 106 to 1, the rim from 10-6 to 1, the axial ratio from 1.00025 to 20, and the rim thickness from 5% to 20%. Theoretical consideration of a concentric elliptical inclusion and ellipse reduces the number of scalar values to be determined to fully characterize the system to two: one for the rate of stretch of the inclusion and one for the rate of rotation. From these two values, the rotation and stretching rate can be calculated for any orientation and 2D background flow field. For effectively rigid particles, the cut-off axial ratio between rotation and stabilization is determined by the remaining two parameters, namely the rim viscosity and the thickness, with low rim viscosity or thick rims promoting stabilization. The shape fabric of a population of particles in a high strain shear zone, presented as a typical Rf/? plot, can be forward modelled using an initial value Ordinary Differential Equation (ODE) approach. Because the rim does not remain elliptical to high strain, this method cannot accurately model the behaviour of individual inclusions. However, a statistical approach, allowing variation in rim viscosity, which is also a proxy for variation in rim thickness, reproduces the characteristics of the shape preferred orientation of natural clast populations remarkably well. Deformable inclusions with a very weak rim show very similar behaviour to rigid inclusions. As inclusion viscosity is decreased and rim viscosity is increased toward that of the matrix, there is an increasing tendency for inclusions to elongate, which promotes back-rotation and development of (quasi-) stable orientations, rather than the continued rotation of low axial ratio inclusions. Power-law rheology increases the effective viscosity ratios between inclusion, rim and matrix: the slowly deforming strong inclusion is stronger and generally nearly rigid, whereas high strain rate in (parts of) the rim lowers the effective viscosity, tending to stabilize the inclusion. Because of the range of controlling parameters involved, any attempt at "vorticity analysis" based on clast shape preferred orientation or on the "stable" orientation of individual clasts is not really practical. Measurement of apparently stable back-rotated angles or estimation of the cut-off axial ratio below which inclusions continuously rotate does not allow a unique determination of the vorticity of flow.

Mancktelow, N. S.

2012-04-01

218

Bone regeneration with systemic administration of lactoferrin in non-critical-sized rat calvarial bone defects.  

Science.gov (United States)

Using in vivo microfocus computed tomography (micro-CT) and tissue sections, we evaluated bone regeneration in non-critical-sized rat calvarial flat bone defects during systemic administration of lactoferrin (LF). Ten 11-week-old male Fischer rats were used. Non-critical-sized calvarial bone defects (diameter, 2.7 mm) were trephined into the dorsal parietal bone on both sides of the midsagittal suture, and a collagen sponge soaked in saline was placed on each side. LF was injected intraperitoneally every day, starting on the day of the operation (day 0; groups: control, 10 mg/kg LF, 100 mg/kg LF). Micro-CT imaging was performed repeatedly from 1 to 4 weeks after surgery. The defect sites were then removed, along with surrounding bone and soft tissues, and stained with hematoxylin and eosin. During weeks 1-4, micro-CT showed a significant difference in reossification ratio between the controls and the 100 mg/kg LF group. Histological analysis revealed that there were more osteoblast-like cells around the bony rim in the 100 mg/kg group than in the control group. In summary, micro-CT and histological analyses showed that systemic administration of LF accelerated bone regeneration in non-critical-sized rat calvarial bone defects. PMID:24351923

Yoshimaki, Tomohiro; Sato, Shuichi; Tsunori, Katsuyoshi; Shino, Hiromichi; Iguchi, Shinya; Arai, Yoshinori; Ito, Koichi; Ogiso, Bunnai

2013-01-01

219

Talking Bones.  

Science.gov (United States)

Describes cooperation with the Saint Louis Zoo to provide opportunities for elementary school students to learn about bones, how animals move, what they eat, and how much they grow. Uses biofacts which include bones, skulls, and other parts to make the laboratory a hands-on experience for students. (YDS)

Johnson, Jaclyn; Kassing, Sharon

2002-01-01

220

A FIB/TEM/Nanosims Study of a Wark-Lovering Rim on an Allende CAI  

Science.gov (United States)

Ca- Al-rich inclusions (CAIs) are commonly surrounded by Wark-Lovering (WL) rims - thin (approx. 50 micrometers) multilayered sequences - whose mineralogy is dominated by high temperature minerals similar to those that occur in the cores of CAIs [1]. The origins of these WL rims involved high temperature events in the early nebula such as condensation, flashheating or reaction with a nebular reservoir, or combinations of these processes. These rims formed after CAI formation but prior to accretion into their parent bodies. We have undertaken a coordinated mineralogical and isotopic study of WL rims to determine the formation conditions of the individual layers and to constrain the isotopic reservoirs they interacted with during their history. We focus here on the spinel layer, the first-formed highest- temperature layer in the WL rim sequence. Results and Discussion: We have performed mineralogical, chemical and isotopic analyses of an unusual ultrarefractory inclusion from the Allende CV3 chondrite (SHAL) consisting of an approx. 500 micrometers long single crystal of hibonite and co-existing coarsegrained perovskite. SHAL is partially surrounded by WL rim. We previously reported on the mineralogy, isotopic compositions and trace elements in SHAL [2-4]. The spinel layer in the WL rim is present only on the hibonite and terminates abruptly at the contact with the coarse perovskite. This simple observation shows that the spinel layer is not a condensate in this case (otherwise spinel would have condensed on the perovskite as well). The spinel layer appears to have formed by gas-phase corrosion of the hibonite by Mg-rich vapors such that the spinel layer grew at the expense of the hibonite. We also found that the spinel layer has the same 16Orich composition as the hibonite. The spinel layer is polycrystalline and individual crystals do not show a crystallographic relationship with the hibonite. An Al-diopside layer overlies the spinel layer, and is present on both the hibonite and perovskite. While the spinel is 16O-rich, WL-rim perovskite and pyroxene are 16O-poor. This isotopic heterogeneity likely reflects O isotopic equilibration of WL-rim perovskite and pyroxene with a planetary O isotopic reservoir after the WL rim formation. The hibonite is zoned and contains wt.% levels of Ti, Mg and Fe in contact with the Fe-bearing spinel (Sp60Hc40) in the WL rim. The Fe enrichment in spinel is likely related to the Na-Fe metasomatism that is ubiquitous in Allende. Conclusions: The petrography and microstructure of the spinel layer in a WL rim sequence shows that it formed by gas phase reactions at high temperature in the nebula. The oxygen isotopic composition of the spinel indicates that this WL rim layer formed in the same (or similar) nebular gas reservoir as the host CAI.

Keller, L. P.; Needham, A. W.; Messenger, S.

2014-01-01

 
 
 
 
221

Rapid progression of a severe femoral bone loss in a stable revision hip prosthesis: causes and management.  

Science.gov (United States)

We report a case of a severe bone loss of the proximal femur with a rapid progression, in a 72-year-old male patient with a stable total revision hip prosthesis. The patient had a persistent mechanical thigh pain. The blood laboratory values were normal. Infection disease and osteolytic bone tumor were excluded. A surgical procedure was performed. The native bone of the proximal femur was resorbed and replaced by a dense fibrous tissue with some sclerotic bone fragments. A large amount of a brownish fluid and a red-brown and friable tissue were found in the pseudojoint cavity. The proximal femur was reconstructed using a large amount of cryopreserved cancellous bone allograft, with retention of the femoral prosthesis. The mechanism of the bone lesion can be related not only to the host response to the wear particles, but mainly to the fluid pressure in the effective joint space. Femoral progressive osteolysis in a stable hip prosthesis is an indication for surgery in useful time, before adverse bone remodeling can begin and lead to major bone loss. PMID:23149643

Judas, Fernando; Marques, Alexandre; Maximino, Luís; Lucas, Francisco

2012-01-01

222

Experimentally Produced Spinel Rims on Ca-Al-Rich Inclusion Bulk Compositions  

Science.gov (United States)

Most Ca-Al-rich inclusions (CAls) from Allende are surrounded by a series of mineralogically distinct rim layers. Proposed modes of formation for these layers include flash heating, evaporation, and condensation. The innermost of these rim layers is generally spinel (SP), in some cases intergrown with perovskite (PV), and commonly containing varying amounts of secondary iron increasing towards the edge of the CAI. The SP or SP+PV rim is not always contiguous with the other rim layers, indicating that it is probably the result of a separate event. We have produced continuous SP rims on synthetic analogs representing Type A/B1, average Type B, and Type B2 bulk compositions by reheating a solid glass experimental charge to subliquidus crystallization temperatures. This experimental result is consistent with the formation of chondrules; and CAIs by more than one sequence of heating and cooling. Previous work indicated that prior crystallization events produced observable effects in the texture and chemistry of the final run product. Information on the nature of the heating/cooling cycles experienced by CAls and chondrules is important in modeling the environment of their formation. Additional information is contained in the original extended abstract.

Paque, Julie M.; Le, L.; Lofgren, G. E.

1998-01-01

223

Modelling of Rim-layer features in frames of START-3 code development  

International Nuclear Information System (INIS)

'Rim-effect' is a conventional term implying a number of microstructure and thermal physical phenomena, oriented from the periphery of a highly irradiated LWR fuel pellet, also called 'rim layer', 'rim', 'high burnup structure' (HBS) etc. One of the rim-effect consequences, important for fuel reliability, is evident intensification of fission gas release (FGR) and increase of rod internal pressure after certain threshold of fuel burnup. Results from post irradiation examinations (PIE) of WWER fuel demonstrate this tendency in a range of rod average burnup from 42-45 MWd/kgU to 60-65 Mwd/kgU. A recently developed dynamic model of FGR behavior based on analysis of a number of interrelated microstructure processes, differing by their rates and magnitudes and depending on external operational conditions, is briefly described in this paper. A verification of the model is performed using experimental data on matrix xenon EPMA and on fuel porosity. The verified model is integrated in the START-3 code and full-scale calculations of FGR are performed with the code. The developed model has demonstrated a good prediction for some important parameter of rim microstructure and for values of integral fission gas release in highly irradiated WWER fuel rods

224

Rim current and coastal eddy mechanisms in an eddy-resolving Black Sea general circulation model  

Science.gov (United States)

The DieCAST ocean model is applied to a study of the circulation in the Black Sea, using 1/12° horizontal resolution and with 20 vertical layers. Boundary forcings are monthly wind stress, evaporation minus precipitation, air-sea heat flux, freshwater influx from 11 rivers and exchange with the Mediterranean Sea through the Bosphorus Strait. The model reproduces fundamental physical features of the Black Sea: seasonal fluctuations in the quasi-permanent cyclonic Rim Current, numerous anticyclonic meanders and eddies lying between the Rim Current and the coast, Rossby waves propagating westward across the basin, coastally trapped waves, and the annual cycle of vertical mixing. Model results shed light on the mechanisms affecting such features. These include interactions of the Rim Current with coastal bathymetry abutments, leading to recirculations that pinch off vortices as in island wakes, and possible baroclinic instability of the Rim Current; these are modulated by the large annual stratification cycle above a relatively shallow and strong pycnocline, as is the Rim Current itself. The resulting wake eddies often merge into major coastal circulation features such as the seasonal Batumi and Sevastopol eddies. These anticyclonic eddies play a fundamental role in coastal and open-sea exchange processes. Hydrographic data from sampling cruises and recent Topex-Poseiden (T/P) altimeter data strongly supports our analysis.

Staneva, Joanna V.; Dietrich, David E.; Stanev, Emil V.; Bowman, Malcolm J.

2001-11-01

225

Impact of slippage on the morphology and stability of a dewetting rim  

International Nuclear Information System (INIS)

In this study lubrication theory is used to describe the stability and morphology of the rim that forms as a thin polymer film dewets from a hydrophobized silicon wafer. Thin film equations are derived from the governing hydrodynamic equations for the polymer to enable the systematic mathematical and numerical analysis of the properties of the solutions for different regimes of slippage and for a range of timescales. Dewetting rates and the cross sectional profiles of the evolving rims are derived for these models and compared to experimental results. Experiments also show that the rim is typically unstable in the spanwise direction and develops thicker and thinner parts that may grow into 'fingers'. Linear stability analysis as well as nonlinear numerical solutions are presented to investigate shape and growth rate of the rim instability. It is demonstrated that the difference in morphology and the rate at which the instability develops can be directly attributed to the magnitude of slippage. Finally, a derivation is given for the dominant wavelength of the bulges along the unstable rim.

226

[Computed tomography of the temporal bone in diagnosis of otitis media chronica purulenta].  

Science.gov (United States)

Computed tomography (CT) of the temporal bone has been used to study thirty-eight 5-72-year-old patients with otitis media chronica purulenta (OMCP), in 14 of them the process was bilateral. A scheme of CT assessment of the temporal bone is proposed. The analysis of 52 CTs of the temporal bone with consideration of otoscopic and operative findings helped to distinguish CT signs of non-cholesteatomic OMCP. These signs include sclerotic alterations of the bone tissue of the mastoid process (82.7%), defective pneumaticity of the middle ear cavities (tympanic cavity - 80.7%) due to pathological substrate, destructive changes of the auditory bones (50%), carious alterations of the walls of the middle ear cavities (21%). The study of the temporal bone by the proposed scheme detected such anomalies and structural features as presentation of the sigmoid sinus (36.5%), elevation of the bulb of the jugular vein (3.8%), diverticulum of the jugular vein (3.8%), low fundus of the middle cranial fossa (7.7%). PMID:15496836

Zelikovich, E I

2004-01-01

227

Mechanical fracture study of nuclear fuel high burn-up structure (HBS or RIM) during annealing test; Etude de la fracturation mecanique de la structure a haut taux de combustion des combustibles irradies (RIM) en traitement thermique  

Energy Technology Data Exchange (ETDEWEB)

The ceramics used in Power Water Reactors ar made of uranium dioxide. Irradiated at high Burn-up, they present a characteristic zone in periphery called High Burn-Up Structure or RIM zone with micrometer pores containing over-pressurized gas bubbles. Annealing texts simulating incidental or accidental reactor situations, a strong release of the RIM zone is observed. We have considered that the fission gas release mechanism is the mechanical fracture of the RIM grain boundaries. The we have compared the different types of mechanical stress applied to a grain boundary with the fracture stress of the oxide. The first stress is due to RIM over-pressurized gas bubbles, these bubbles apply a stress field determined at a microscopic level i.e. at the gas bubbles scale and its local environment. The second stress is generated by the Pellet-Cladding Mechanical Interaction (PCMI). This stress applies a stress field on a microscopic scale i.e. at the RIM zone and its overall environment. The last stress is occurred by a strain due to the RIM structural evolution during annealing test. The experimental results show that microscopic and macroscopic stress fields to do not explain the RIM grain boundary fracture during annealing test. The stresses induced by the RIM structural evolution as a function of the temperature is a possible mechanism to explain the overall mechanical behavior of the RIM zone during annealing test. (author)

Marcet, M.

2010-12-07

228

A FIB/TEM Study of a Complex Wark-Lovering Rim on a Vigarano CAI  

Science.gov (United States)

Wark-Lovering (WL) rims are thin multilayered mineral sequences that surround most Ca, Al-rich inclusions (CAIs). Several processes have been proposed for WL rim formation, including condensation, flash-heating or reaction with a nebular reservoir, or combinations of these [e.g. 1-7], but no consensus exists. Our previous coordinated transmission electron microscope (TEM) and NanoSIMS O isotopic measurements showed that a WL rim experienced flash heating events in a nebular environment with planetary O isotopic composition, distinct from the (16)O-rich formation environment [6]. Our efforts have focused on CAIs from the CV(sub red) chondrites, especially Vigarano, because these have escaped much of the parent body alteration effects that are common in CAIs from CV(sub ox) group.

Keller, L. P.; Needham, A. W.; Messenger, S.

2013-01-01

229

Development of phased array UT technique for inspection of turbine wheel rim  

International Nuclear Information System (INIS)

A phased array UT technique has been developed for the improvement of defect detection under the keyway region of shrunk-on type turbine wheel. The sector scanning mode operation with plexiglas wedge of phased array capability was applied to construct the B-scope image of turbine wheel rim region. Preceding to the inspection test of the model specimen having real shape of rim region, the distribution of sound field intensity along the steering angle of the scanning line was measured on the test block. Then, the minimum depth of detectable defect by the B-scope imaging was evaluated on the dovetail shape specimens which had different depth EDM notches at the each hook fillet. As the results, it has been realized that the B-scope imaging of the sector scanning mode phased array technique has a capability for distinguishing the defect echoes from the many reflection echoes caused by the complexed shape of wheel rim region

230

Cracking of an Aircraft Wheel Rim Made From Al-Alloy 2014-T6  

Directory of Open Access Journals (Sweden)

Full Text Available Generally failures of different aircraft components and parts are revealed and examined by the use of non-destructive examination methods. In further detailed explanation and interpretation of failures optical and scanning electron microscopy are used. This paper deals with a problem of a crack on aircraft wheel rim made from aluminium alloy 2014-T6.The crack was observed during regular control by the maintenance unit for non-destructive examination of the Slovenian air carrier Adria Airways. The crack on the rim of an aircraft wheel investigated was a typical fatigue crack. At same time a numerous pits were found which served as stress concentrations on the rim surface.

G. Kosec

2010-10-01

231

Flight testing of the AIM/RIM-7M missile, preflight analysis  

Science.gov (United States)

The AIM/RIM-7M missile is the most recent version of the AIM-7 missile series. It is in the preproduction phase and has completed most of the preproduction flight test evaluation. A description is presented of the preflight simulation techniques used, taking into account the value of the techniques in predicting the results of actual flights. The AIM/RIM-7M is a semiactive, radar-guided homing missile with sophisticated onboard digital processing. It may be launched from either an aircraft or a surface system. To a large degree, the AIM/RIM-7M represents problems typical of all guided missiles. The described techniques are directly applicable to radar-guided missiles and generically to all types of guided missiles. Attention is given to simulation bay activities, the anechoic chamber, aspects of RF control, the target array, computer models, aspects of preflight simulations, and the test setup.

Hicks, W.; Greenberg, E.

1981-11-01

232

Mechanical fracture study of nuclear fuel high burn-up structure (HBS or RIM) during annealing test  

International Nuclear Information System (INIS)

The ceramics used in Power Water Reactors ar made of uranium dioxide. Irradiated at high Burn-up, they present a characteristic zone in periphery called High Burn-Up Structure or RIM zone with micrometer pores containing over-pressurized gas bubbles. Annealing texts simulating incidental or accidental reactor situations, a strong release of the RIM zone is observed. We have considered that the fission gas release mechanism is the mechanical fracture of the RIM grain boundaries. The we have compared the different types of mechanical stress applied to a grain boundary with the fracture stress of the oxide. The first stress is due to RIM over-pressurized gas bubbles, these bubbles apply a stress field determined at a microscopic level i.e. at the gas bubbles scale and its local environment. The second stress is generated by the Pellet-Cladding Mechanical Interaction (PCMI). This stress applies a stress field on a microscopic scale i.e. at the RIM zone and its overall environment. The last stress is occurred by a strain due to the RIM structural evolution during annealing test. The experimental results show that microscopic and macroscopic stress fields to do not explain the RIM grain boundary fracture during annealing test. The stresses induced by the RIM structural evolution as a function of the temperature is a possible mechanism to explain the overall mechanical behavior of the RIM zone during annealing test. (author)

233

Bone Densitometry  

Medline Plus

Full Text Available ... is NOT painful. Depending on what type of machine is used, you may be asked to either ... your ankle in a special device. Bone Densitometry Machine Most machines use x-rays but some use ...

234

Bone Densitometry  

Medline Plus

Full Text Available ... In people with osteoporosis, new bone has less calcium in it and is therefore weaker than the ... 1 Some antacids contain aluminum hydroxide, which prevents calcium from being absorbed by the body. People who ...

235

Bone Densitometry  

Medline Plus

Full Text Available ... prevented with oral medication, staying active and a healthy diet. Bone density tests are available and very helpful in detecting osteoporosis early. Most patients with osteoporosis live very healthy and productive lives! This document is for informational ...

236

Bone Densitometry  

Medline Plus

Full Text Available ... make osteoporosis worse. Smoking and excessive use of alcohol tend to also make osteoporosis worse. Sustained exercise, such as running marathons, decreases the levels of estrogen in the blood and may predispose to osteoporosis. Bone Densitometry Test ...

237

Bone Tumor  

Science.gov (United States)

... shows a tumor that causes a saucer-like erosion in the end of the thighbone. The insert ... of the types of bone tumors and their behaviors. Researchers are studying the design of metallic implants. ...

238

Study on thd relationship between serum fibrosis markers levels, bone marrow scintigraphy patterns and clinical staging in patients with chronic ldiopathic myelofibrosis (CIMF)  

International Nuclear Information System (INIS)

Objective: To study the changes of serum fibrosis markers levels and the pattern of bone marrow scintigraphy and their relationship with clinical stages in patients with chronic idiopathic myelofibrosis (CIMF). Methods: Transforming growth factor-?1 (TGF-?1) and platelet derived growth factor (PDGF) (with ELISA), serum typeIII procollagen (PCIII), type IV collagen (C-IV), and laminin (LN) (with RIA) were detected in 46 with patients with chronic idiopathic myelofibrosis and 34 controls. Bone marrow scintigraphy 99m Tc-sulfur colloid was performed in the 46 CIMF patients. Results: Five fibrosis markers in patients with CIMF were significantly higher than those in controls. There were significantly differences among the levels in different stages, especially with sclerotic stage in CIMF patients. The imaging patterns were classified into three types according to the radio-distribution and activity of bone marrow: 13 cases of increased imaging in 14 patients of cellular stage, 17 cases with creased expansion imaging in 19 patients of collagen fiber stage and 13 cases (100%) with totally depressed imaging in patients of sclerotic stage. Conclusion: As the disease progressed, the serum fibrosis markers levels gradually incroased and the scintigraphy patterns corresponded well to the clinical staging. (authors)

239

What is the future of western US steam coal in the Pacific Rim  

International Nuclear Information System (INIS)

This paper reports that approximately one-fourth of the world's recoverable coal reserves are located in the United States and about 50% of that coal is deposited in the Western Region. Because of its proximity to West Coast ports, Western steam coal is the best positioned U.S. coal which could play a diversification role in meeting the expanding energy demands of the Pacific Rim. Currently Western U.S. coal has achieved less than a 5% share of the rapidly growing steam coal market in the Pacific Rim

240

IISD RS @ CSD-20 Arab RIM, 29-30 May 2013, Dubai, UAE  

...IISD RS @ CSD-20 Arab RIM, 29-30 May 2013, Dubai, UAE Session of the Commission for Sustainable Development (CSD-20), 29-30 May 2013, ... Dubai, United Arab Emirates (UAE) Sustainable Development (CSD), Arab RIM for the 20th Session of the Commission for ...Sustainable Development (CSD-20), 29-30 May 2013, Dubai, United Arab Emirates (UAE) Summary Report Reporting Services (IISD RS) has produced a summary ...for the Twentieth Session of the Commission for Sustainable Development (CSD-20) 29-30 May 2013 | Dubai, United Arab Emirates (UAE) The Arab Regional Implementation ...

 
 
 
 
241

Nonimaging secondary concentrators for large rim angle parabolic troughs with tubular absorbers  

Science.gov (United States)

For parabolic trough solar collectors with tubular absorbers, we design new tailored secondary concentrators. The design is applicable for any rim angle of a parabolic reflector. With the secondary, the concentration can be increased by a factor of more than 2 with a compact secondary reflector consisting of a single piece, even for the important case of a rim angle of 90 deg. The parabolic reflector can be used without changes; the reduced absorber is still tubular but smaller than the original absorber and slightly displaced toward the primary. concentrators, solar trough collectors, tailored reflectors.

Ries, Harald; Spirkl, Wolfgang

1996-05-01

242

Past, Present, Future: Developing Linkages Around the Pacific Rim. Proceedings of the Annual Conference of the Pacific Rim Association for Higher Education (3rd, Vancouver, British Columbia, October 12-13, 1982).  

Science.gov (United States)

Issues facing higher education around the Pacific Rim are considered in 12 conference papers. Titles and authors include the following: "Developing Linkages around the Pacific Rim" (Stephen Foster); "A Cooperative Approach to Professional Development: The Canadian Connection" (Peter Murphy); "Using Film in Teaching Concepts--Some Significant…

Foster, Stephen F., Ed.; Moir, Philip E., Ed.

243

Bone tumors  

International Nuclear Information System (INIS)

As a functional technique, bone scintigraphy can yield clinical information which cannot be obtained by morphological methods. It is used to find tumors, undetectable by means of radiological techniques, to prove multifocal disease, to image metastases (osseous and non-osseous), and to evaluate the follow-up during therapy. Bone scintigraphy has only limited value for the differentiation of benign from malignant lesions. Compared with conventional X-ray, magnetic resonance imaging (MRI) and computed tomography (CT), bone scintigraphy has an extremely high sensitivity and a relatively low specificity. MRI is particularly useful for the evaluation of soft tissue infiltration, whereas the exact spatial extent can best be imaged using CT. During the recent few years, first experiences have been gained with positron emission tomography (PET) in clinical bone tumor diagnosis. Like bone scintigraphy, this method does not allow a specific diagnosis, particularly no differentiation between benign and malignant tumors, but it has the advantage that alterations of tumor viability (e.g. during therapy) can be measured early. (orig./MG)

244

Detection of solar wind-produced water in irradiated rims on silicate minerals.  

Science.gov (United States)

The solar wind (SW), composed of predominantly ?1-keV H(+) ions, produces amorphous rims up to ?150 nm thick on the surfaces of minerals exposed in space. Silicates with amorphous rims are observed on interplanetary dust particles and on lunar and asteroid soil regolith grains. Implanted H(+) may react with oxygen in the minerals to form trace amounts of hydroxyl (-OH) and/or water (H2O). Previous studies have detected hydroxyl in lunar soils, but its chemical state, physical location in the soils, and source(s) are debated. If -OH or H2O is generated in rims on silicate grains, there are important implications for the origins of water in the solar system and other astrophysical environments. By exploiting the high spatial resolution of transmission electron microscopy and valence electron energy-loss spectroscopy, we detect water sealed in vesicles within amorphous rims produced by SW irradiation of silicate mineral grains on the exterior surfaces of interplanetary dust particles. Our findings establish that water is a byproduct of SW space weathering. We conclude, on the basis of the pervasiveness of the SW and silicate materials, that the production of radiolytic SW water on airless bodies is a ubiquitous process throughout the solar system. PMID:24449869

Bradley, John P; Ishii, Hope A; Gillis-Davis, Jeffrey J; Ciston, James; Nielsen, Michael H; Bechtel, Hans A; Martin, Michael C

2014-02-01

245

Rim uplift and crater shape in Meteor Crater: Effects of target heterogeneities and trajectory obliquity  

Science.gov (United States)

We have analyzed the rim structure of Meteor Crater, Arizona, in order to understand the mechanism of rim uplift in simple craters and the causes of the shape of polygonal impact craters. For this purpose, we systematically determined bedding orientation of the autochthonous crater wall and overturned flap and analyzed the kinematics of major radial faults. We found that rim uplift correlates with the crater shape and increases in the corners of the crater. The two main mechanisms of differential uplift are the formation of horizontal interthrust wedges, leading to the doubling of strata in the rim, and radial corner faults, or tear faults, that vertically displace bedrock. The development of Meteor Crater's quadrangular shape is caused by more effective crater excavation flow parallel to major joint sets. Additionally, we infer the impact direction with a newly developed technique, the two corners model, and review the arguments in favor of an oblique trajectory. While the data set is ambiguous, several indicators suggest an impact direction from the NNW. We conclude that oblique impacts should have an effect on early cratering and excavation flow, whereas target heterogeneities like joints start to play a prominent role in later stages when the stresses induced by the excavation flow are in the same order of strength as the material involved.

Poelchau, Michael H.; Kenkmann, Thomas; Kring, David A.

2009-01-01

246

RIMS/sup tm/ - radiological information management system: software package EI-029-S86  

Energy Technology Data Exchange (ETDEWEB)

RIMS/sup tm/ has been developed for health physics record keeping and reporting. It provides for the management needs relating to radiological information control at a nuclear facility. The program is comprised of the following modules: Personnel Radiological Information, Radiological Work Permit, Radiation Survey Records, Access Control, ALARA Reporting, and Respirator and Survey Instrument Inventory Modules.

1988-01-01

247

A Humble Opinion on the Development Strategies for Bohai Rim Cultural Tour Industry  

Science.gov (United States)

strengthening the impression of the tour, enhancing the attractiveness of tour resources, making traditional classic products to develop sustainably are the goals of a tour city and its tourism's development, this article expatiate on the development strategies: how to realize the linkage exploitation, the product upgrading and influence expanding for Bohai rim tour cities’ cultural tour industry.

Qi, Zhaochuan; Li, Qianghua

248

Detection of solar wind-produced water in irradiated rims on silicate minerals  

Science.gov (United States)

The solar wind (SW), composed of predominantly ?1-keV H+ ions, produces amorphous rims up to ?150 nm thick on the surfaces of minerals exposed in space. Silicates with amorphous rims are observed on interplanetary dust particles and on lunar and asteroid soil regolith grains. Implanted H+ may react with oxygen in the minerals to form trace amounts of hydroxyl (?OH) and/or water (H2O). Previous studies have detected hydroxyl in lunar soils, but its chemical state, physical location in the soils, and source(s) are debated. If ?OH or H2O is generated in rims on silicate grains, there are important implications for the origins of water in the solar system and other astrophysical environments. By exploiting the high spatial resolution of transmission electron microscopy and valence electron energy-loss spectroscopy, we detect water sealed in vesicles within amorphous rims produced by SW irradiation of silicate mineral grains on the exterior surfaces of interplanetary dust particles. Our findings establish that water is a byproduct of SW space weathering. We conclude, on the basis of the pervasiveness of the SW and silicate materials, that the production of radiolytic SW water on airless bodies is a ubiquitous process throughout the solar system. PMID:24449869

Bradley, John P.; Ishii, Hope A.; Gillis-Davis, Jeffrey J.; Ciston, James; Nielsen, Michael H.; Bechtel, Hans A.; Martin, Michael C.

2014-01-01

249

Summary of the CSD-20 Arab RIM, 29-30 May 2013, Dubai, UAE  

...Session of the Commission for Sustainable Development (CSD-20), 29-30 May 2013, Dubai, United Arab Emirates (UAE) Sustainable Development (CSD), Summary ...for the 20th Session of the Commission for Sustainable Development (CSD-20), 29-30 May 2013, Dubai, United Arab Emirates (UAE) Summary of the CSD-20 ...Arab RIM, 29-30 May 2013, Dubai, UAE ...

250

Incident laser modulation of a repaired damage site with a rim in fused silica rear subsurface  

International Nuclear Information System (INIS)

Local CO2 laser treatment has proved to be an effective method to prevent the 351-nm laser-induced damage sites in a fused silica surface from exponentially growing, which is responsible for limiting the lifetime of optics in high fluence laser systems. However, the CO2 laser induced ablation crater is often surrounded by a raised rim at the edge, which can also result in the intensification of transmitted ultraviolet light that may damage the downstream optics. In this work, the three-dimensional finite-difference time-domain method is developed to simulate the distribution of electrical field intensity in the vicinity of the CO2 laser mitigated damage site located in the exit subsurface of fused silica. The simulated results show that the repaired damage sites with raised rims cause more notable modulation to the incident laser than those without rims. Specifically, we present a theoretical model of using dimpled patterning to control the rim structure around the edge of repaired damage sites to avoid damage to downstream optics. The calculated results accord well with previous experimental results and the underlying physical mechanism is analysed in detail. (electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics)

251

RIMS/sup tm/ - radiological information management system: software package EI-029-S86  

International Nuclear Information System (INIS)

RIMS/sup tm/ has been developed for health physics record keeping and reporting. It provides for the management needs relating to radiological information control at a nuclear facility. The program is comprised of the following modules: Personnel Radiological Information, Radiological Work Permit, Radiation Survey Records, Access Control, ALARA Reporting, and Respirator and Survey Instrument Inventory Modules

252

49 CFR 238.119 - Rim-stamped straight-plate wheels.  

Science.gov (United States)

(b) A rim-stamped straight-plate wheel shall not be used as a replacement wheel on a private car that operates in a passenger train if a brake shoe acts on the tread of the wheel for the purpose of slowing the...

2010-10-01

253

29 CFR 1910.177 - Servicing multi-piece and single piece rim wheels.  

Science.gov (United States)

...be applied to a single piece wheel. (12) Cracked, broken, bent, or otherwise damaged wheels shall not be reworked, welded...who service large vehicle rim wheels. Reprints of the charts...The address and telephone number of the nearest OSHA...

2010-07-01

254

Study on High Sensitive FFDL Technique for Monju and next generation SFR Using RIMS  

International Nuclear Information System (INIS)

The high sensitive Failed Fuel Detection and Location technique for fast reactors has been developed using RIMS. Major achievements: - Tag gas (krypton and Xenon) was successfully identified with no concentration process in Joyo. - Burn-up of the failed fuel subassembly can be assumed. - Prototype FFDL system for Monju was proposed. ? Further enhancement of fast reactor safety

255

RIM: A Random Item Mixture Model to Detect Differential Item Functioning  

Science.gov (United States)

In this paper we present a new methodology for detecting differential item functioning (DIF). We introduce a DIF model, called the random item mixture (RIM), that is based on a Rasch model with random item difficulties (besides the common random person abilities). In addition, a mixture model is assumed for the item difficulties such that the…

Frederickx, Sofie; Tuerlinckx, Francis; De Boeck, Paul; Magis, David

2010-01-01

256

Early Identification for Special Education: Implications for Research and Development in the Pacific Rim  

Science.gov (United States)

Early identification and intervention for children with disabilities can significantly improve longer term outcomes, but in developing nations like many in the Pacific Rim, such programs and practices can be expensive and must compete against other needs. We argue that early identification and intervention by schools leads not only to life…

Cook, Bryan; Gerber, Michael; Hong, Li-Yu; Mannan, Hasheem; Zhang, Weng-jing

2012-01-01

257

Stereological evolution of the rim structure in PWR-fuels at prolonged irradiation: Dependencies with burn-up and temperature  

International Nuclear Information System (INIS)

The stereology of the rim-structure was studied for PWR-fuels up to the ninth irradiation cycle, achieving maximum local burn-ups of 240 GWd/tM and beyond. At intermediate radial positions (0.55 0 c = 0.29. Rim-cavities are expected to remain closed at least up to this limit

258

76 FR 69720 - NaturEner Rim Rock Wind Energy, LLC; Supplemental Notice That Initial Market-Based Rate Filing...  

Science.gov (United States)

...Regulatory Commission [ Docket No. ER12-295-000] NaturEner Rim Rock Wind Energy, LLC; Supplemental Notice That Initial Market-Based...supplemental notice in the above-referenced proceeding of NaturEner Rim Rock Wind Energy, LLC's application for market-based...

2011-11-09

259

Type I Chondrules with Ferroan Igneous Rims from Yamato 81020 CO3 and Acfer 094 Ungrouped Type 3 Carbonaceous Chondrites  

Science.gov (United States)

We found type I chondrules surrounded by FeO-rich igneous rims in Y-81020 and Acfer 094. These chondrules provide direct evidences that some type I chondrules were recycled in type II chondrule-forming region to form the FeO-rich igneous rims.

Nagashima, K.; Krot, A. N.; Libourel, G.

2014-09-01

260

Diffusion-controlled growth of bimineralic merwinite - diopside reaction rims between wollastonite - monticellite interfaces  

Science.gov (United States)

At temperatures of 800 °C to 900 °C and 1.2 GPa, monticellite and wollastonite react to form merwinite and diopside after the reaction: 2 monticellite (CaMgSiO4) + 2 wollastonite (CaSiO3) â?? merwinite (Ca3MgSi2O8) + diopside (CaMgSi2O6) We synthesized bimineralic merwinite - diopside reaction rims along the interfaces of cylindric crystals of monticellite and wollastonite. The samples were loaded in a platinum capsule and annealed at 800 °C to 900 °C and 1.2 GPa in a piston cylinder apparatus for 5 to 65 hours. Natural CaF2 was used as pressure medium and the charges were nominally dry. In all experiments, a single layer consisting of bimineralic aggregates of merwinite and diopside was produced in about equal molar amounts. Time series revealed that rim growth is parabolic, indicating that the reaction kinetics is controlled by component diffusion. SEM analysis of the microstructure showed that the original monticellite-wollastonite interface is located in the centre of the reaction rim. This implies that rim growth primarily occurred by transfer of the mobile component MgO from the rim-monticellite interface to the rim-wollastonite interface. The bulk reaction is thus divided into two half reactions occurring at the two reaction fronts. At the rim-monticellite interface the reaction is: 2 monticellite â?? 0.5 merwinite + 0.5 diopside + MgO, and at the rim-wollastonite interface, it is: 2 wollastonite + MgO â?? 0.5 merwinite + 0.5 diopside Using the model of Abart et al. (2009), the effective diffusion coefficients DMgO at 800 °C are estimated at 1.55×10-16± 2.18×10-17 m2/s, and at 900 °C at 2.46×10-16± 3.45×10-17 m2/s. This yields an activation energy of Ea= 45.6 ± 16.4 kJ/mol and a pre-exponential factor log D0 = -13.59 ± 1.26 for the Arrhenius relations to describe the temperature-dependent effective diffusivity of the MgO component in the bimineralic aggregate. IR-spectra revealed distinctive OH-contents in the nominally dry phases monticellite and wollastonite after the experiments, which had not been present in the reactants. Obviously, some hydrogen released by the natural, water-containing CaF2 pressure medium diffused into the capsule, thus producing traces of water inside. The presence of minute amounts of water may strongly enhance the kinetics of the reaction. In fact, if completely waterfree Al2O3-powder is used as pressure medium, no significant reaction occurred, and accordingly, reactants remain OH-free. An Al2O3-layer of 3 mm thickness between the capsule and the CaF2 surrounding delays the onset of rim growth for about one hour. However, once initiated, the reaction progress is the same in instantaneous and delayed reactions. References: Abart R., Petrishcheva E., Fischer F.D., Svoboda J. (2009), Thermodynamic model for diffusion controlled reaction rim growth in a binary system: application to the forsterite-enstatite-quartz system, American Journal of Science, Vol. 309, pp. 114-131

Joachim, B.; Gardes, E.; Heinrich, W.; Abart, R.

2009-04-01

 
 
 
 
261

Calculation of ejecta thickness and structural uplift for Lunar and Martian complex crater rims.  

Science.gov (United States)

Crater rims of simple and complex craters have an elevation that is formed during the excavation stage of crater formation. For simple crater rims it is believed that the elevation is due to the sum of two equal parts, the thickness of the most proximal impact ejecta blanket (overturned flap) plus the thickness that results from plastic deformation including injection [1, 2, 3]. We intend to measure and quantify the kinematics of mass movements, especially concerning the question why complex impact craters have elevated crater rims like simple craters and precisely constrain the ejecta thickness and structural uplift of Lunar and Martian crater rims to understand what the main contributor to the elevated rim is [4]. We investigated a pristine 16 km-diameter unnamed Martian complex crater (21.52°N, 184.35°) and the lunar complex craters Bessel (21.8°N, 17.9°E) 16 km in diameter and Euler (23.3°N, 29.2°W) 28 km in diameter [5, 6]. In the crater walls of these craters we found columnar lavas on Mars and basaltic layering on the Moon. We used the uppermost layers of these exposed outcrops along the crater wall to determine the dip of the target rocks (Mars) and to distinguish between the bedrock and the overlying ejecta. We precisely measured the structural uplift and ejecta thickness of these complex craters. The unnamed crater on Mars has a mean rim height of 375.75 m, with a structural uplift of 233.88 m (57.44%), exposed as columnar lavas and the superposing ejecta has a height of 141.87 m (43.56%). For the Lunar complex crater Euler the mean total rim height is 790 ± 100 m, with a minimal structural uplift of 475 ± 100 m (60 ± 10 %), exposed as basaltic layers [e.g., 7, 8] and a maximum ejecta thickness of 315 ± 100 m (40 ± 10%). The Lunar complex crater Bessel has a total rim height of 430 ± 15 m , with a minimal structural uplift of 290 ± 15 m (67 ± 3 %), exposed as basaltic layers and a maximum ejecta thickness of 140 ± 115 m (33 ± 3%). For the Martian crater, the calculated structural uplift has a value of 215.83 m [9]. For Euler and Bessel crater calculated values for the structural uplift are 310.76 m and 262.8 m, respectively [10]. The structural uplift of the crater rim only by dike injection and plastic deformation in the underlying target material seems unlikely at distances ~1 km beyond the transient crater cavity. Other mechanisms, like reverse faulting, beginning in the excavation stage of crater formation, could be responsible for additional structural uplift of the crater rim. Nevertheless, our results show that structural uplift is a more dominant effect than ejecta emplacement for complex impact craters. References: [1] Melosh H.J. (1989) Oxford monographs on geology and geophysics, 11, Impact cratering: a geologic process. [2] Poelchau M.H. et al. (2009) JGR, 114, E01006. [3] Shoemaker E. M. (1963) The Solar System, 4, 301-336. [4] Settle M., and Head J.W. (1977) Icarus, v. 31, p. 123. [5] Sturm, S. et al. (2014) LPSC 45, #1801. [6] Krüger T. et al. (2014) LPSC 45, #1834. [7] Hiesinger H. et al. (2002) GRL, 29. [8] Enns A.C. (2013) LPSC XLIV, #2751. [9] Steward S. T. and Valiant G. J. (2006) Meteoritics & Planet. Sci., 41, 1509-1537. [10] Pike R. J. (1974) EPSL, 23, 265-274. [11]Turtle, E. et al. (2005) GSA-SP. 384, 1.

Krüger, Tim; Sturm, Sebastian; Kenkmann, Thomas

2014-05-01

262

Buried Bones  

Science.gov (United States)

This fun Web site is part of OLogy, where kids can collect virtual trading cards and create projects with them. Here, they learn about paleontology with a hands-on activity. The activity opens with an explanation covering how fossilized bones are usually very delicate and buried deeply in rock fossils. Students are then given step-by-step directions for working with a friend to create two make-believe dig sites by burying bones in plaster of Paris. The activity ends with three discussion questions: What was surprising about excavating the bones? What strategies did you find worked well for removing the plaster? How would you have worked differently if you had no idea what was buried inside? Adult supervision is recommended.

263

Constraints on the height of the inner disk rim in pre-main-sequence stars  

Science.gov (United States)

The structure of inner region of protoplanetary disks around young pre-main-sequence stars is still poorly understood. This part of the disk is shaped by various forces that influence dust and gas dynamics, and by dust sublimation, which creates abrupt drops in the dust density. This region also emits strong near-infrared excess that cannot be explained by classical accretion disk models, which suggests the existence of some unusual dust distribution or disk shape. The most prevalent explanation to date is the puffed-up inner disk rim model, where the disk exhibits an optically thin cavity around the star up to the distance of dust sublimation. The critical parameter in this model is the inner disk rim height zmax relative to the rim distance from the star Rin. Observations often require zmax/Rin ? 0.2 to reproduce the near-infrared excess in the spectra. We compile a comprehensive list of processes that can shape the inner disk rim and combine them into a self-consistent model. Two of them, radiation pressure force and the gas velocity profile, have never been applied in this context before. The aim was to find the most plausible theoretical values of zmax/Rin. The results show that this value is ?0.13 for Herbig Ae stars, ?0.11 for T Tau stars, and ?0.10 for young brown dwarfs. This is lower than the observational requirements for Herbig Ae stars. We argue that the same problem exists in T Tau stars as well. We conclude that the puffed-up inner rim model cannot be the sole explanation for the near-infrared excess in young pre-main-sequence stars. Appendix is available in electronic form at http://www.aanda.org

Vinkovi?, D.

2014-06-01

264

Recent studies on the formation of the rim structure and on polygonization in LWR fuel  

International Nuclear Information System (INIS)

At cross sectional burnups in excess of - 40 MWd/kgUO2, a grain subdivision process occurs at the outer rim of LWR UO2 fuel. A similar phenomenon can be observed in the Pu-rich inclusions in MOX fuel. Three phenomena are usually observed in the resulting 'Rim zone': formation of small grains of sub?m size, formation of pores of about ?m size, and reduction of the signal of fission Xe in EPMA measurements. The mechanisms for rim-structure formation are still not fully understood, and it is not completely obvious, whether the above three processes occur simultaneously or one after the other in sequential steps. Also, two different types of small grains have recently been found at CEA in France.The present state of knowledge on rim structure formation in LWR fuel is reviewed, as well as recent progress in observing and understanding the formation of nanocrystals and of polygonization in other ceramics. Controlled ion irradiation techniques, including fission product ions at fission energy (e.g. 72 MeV iodine ions) have been applied to UO2 and to simulated high burnup UO2, so-called SIMFUEL. The process of polygonization, i.e. the rearrangement of dislocations into dislocation walls forming low energy 'sub-boundaries' and rather perfect, but slightly misoriented subgrains, was studied in these experiments. The same experiments confirmed the extreme radiation stability of UO2 and demonstrated effects of fission spikes: fission-induced bubble formation, re-solution of fission gases from bubbles and fission-enhanced gas diffusion and release. No temperature dependence was found between room temperature and 500 deg. C. The combined results are used to discuss possible mechanisms for polygonization and rim structure formation in UO2. (author)

265

Bone Stress  

Science.gov (United States)

In this optics activity, learners examine how polarized light can reveal stress patterns in clear plastic. Learners place a fork between two pieces of polarizing material and induce stress by squeezing the tines together. Learners will observe the colored stress pattern in the image of the plastic that is projected onto a screen using an overhead projector. Learners rotate one of the polarizing filters to explore which orientations give the most dramatic color effects. This activity can be related to bones, as bones develop stress patterns from the loads imposed upon them every day.

Exploratorium, The

2011-12-07

266

Development of an Upper Cambrian rimmed shelf along the Mississippi Valley Graben, Reelfoot Rift, and the southeastern Ozarks, southern Missouri  

Energy Technology Data Exchange (ETDEWEB)

The paleogeographic distribution of intrashelf basin shales and limestones in the Bonneterre (Dresbachian) and Davis (Franconian) Formations, and associated data, suggests that rimmed shelf conditions separated the central Missouri part of the shelf from the Mississippi Valley Graben (MVG) of the Reelfoot Rift to the southeast. Middle Dresbachian rocks of the intrashelf basin area, predominantly limestones, indicate a discontinuous carbonate shelf rim. The succeeding widespread shales of the Franconian intrashelf basin indicate that a continuous rim had developed. The margin of the shelf rim is preserved in part of the 4,700-ft-thick Upper Cambrian succession along the northwest margin of the Mississippi Valley Graben (MVG) of the Reelfoot Rift. Equivalent rocks within the MVG are dominantly dark shales (1,600+ ft thick). The Amoco Spence test well penetrated the rim succession on the northwest margin of the MVG. At least 11 large-scale transgressive-regressive (T-R) carbonate cycles (120--600 ft thick) have been defined in this well; 7 cycles are equivalent to the Bonneterre and Davis Formations. These latter cycles have shaly limestone, or limestone at the base, and grade upward to dolostone or coarsely crystalline dolostone, which are interpreted to be shallowing-upward, bank margin-peritidal carbonates. Northwest of the rim margin and on the southeast side of the St. Francois Mountains, rocks equivalent to the rim succession consist of a series of ramp to platform cycles made up of dolostones and local limestones. Many carbonate shelves on passive margins are rimmed. The development of this Upper Cambrian rimmed shelf along the northwest margin of the MVG suggests that failed rifts can also localized such rims.

Palmer, J.R. (Missouri Geological Survey Program, Rolla, MO (United States). Dept. of Natural Resources)

1993-03-01

267

Association between rim enhancement of breast cancer on dynamic contrast-enhanced MRI and patient outcome: impact of subtype.  

Science.gov (United States)

The heterogeneous nature of breast cancer is represented by three breast cancer subtypes associated with different patient outcome. However, within subtypes, variations still exist. Additional stratification is necessary for more individualized therapy. Functional tumor characteristics on dynamic contrast-enhanced (DCE)-MRI may play a role. Rim enhancement of breast cancers has been associated with unfavorable pathology characteristics in the context of outcome. However, existence of a direct link is unknown. The purpose was to retrospectively determine the association between rim enhancement on DCE-MRI and long-term patient outcome, and whether it has complementary value to subtype. Preoperative DCE-MRI was performed in 556 consecutive female patients who were eligible for breast-conserving therapy. Presence of rim enhancement was assessed. Tumor characteristics were derived from resection specimens. Patients were stratified according to subtype. Association was assessed between rim enhancement and patient, pathology and treatment characteristics, recurrence-free interval and invasive disease-free survival. Median follow-up was 84 months. Patients were stratified into ER-positive/HER2-negative (N = 416), HER2-positive (N = 75), or triple-negative (N = 65) subtypes. Rim enhancement was seen in 29.0 % (N = 161/556) of tumors and was associated with higher histologic grade, negative ER-status, and triple-negative subtype. Only within triple-negative tumors, an association was seen with outcome. Recurrence was lower in non-rim-enhancing tumors (N = 1/36; 2.8 %) compared to rim-enhancing tumors (N = 9/28; 32.1 %) (p = 0.001). Survival was higher in non-rim-enhancing tumors (N = 34/36; 94.4 %) compared to rim-enhancing tumors (N = 18/28; 64.3 %) (p = 0.001). Rim enhancement on DCE-MRI is associated with long-term outcome of patients with triple-negative breast cancer and may potentially serve as a prognostic biomarker in these patients. PMID:25376743

Schmitz, Alexander M Th; Loo, Claudette E; Wesseling, Jelle; Pijnappel, Ruud M; Gilhuijs, Kenneth G A

2014-12-01

268

Bone marrow culture  

Science.gov (United States)

... of your pelvic bone or front of your breast bone. This is done with a small needle inserted into your bone. The process is called a bone marrow aspiration or a biopsy. The tissue sample is sent to a lab. ...

269

Bone Graft Alternatives  

Science.gov (United States)

... deformity or during a surgical procedure such as spinal fusion. What Types of Bone Grafts are There? Bone ... of bone grafts in spine surgery is during spinal fusion. The use of autogenous bone grafts for spinal ...

270

Bone biopsy (image)  

Science.gov (United States)

A bone biopsy is performed by making a small incision into the skin. A biopsy needle retrieves a sample of bone and it ... examination. The most common reasons for bone lesion biopsy are to distinguish between benign and malignant bone ...

271

Bone lesion biopsy  

Science.gov (United States)

Bone biopsy; Biopsy - bone ... biopsy needle is pushed and twisted into the bone. Once the sample is obtained, the needle is ... stitches are applied, and covered with a bandage. Bone biopsy may also be done under general anesthesia ...

272

Dem Bones  

Science.gov (United States)

In this case, students enter the world of a forensic anthropologist who must determine the sex and age of an individual from a collection of bones. Students, in turn, simulate some of the actual procedures conducted in a forensic anthropologist's lab, exa

Bruce, Alease

2001-09-01

273

Osteoclasts prefer aged bone  

DEFF Research Database (Denmark)

We investigated whether the age of the bones endogenously exerts control over the bone resorption ability of the osteoclasts, and found that osteoclasts preferentially develop and resorb bone on aged bone. These findings indicate that the bone matrix itself plays a role in targeted remodeling of aged bones.

Henriksen, K; Leeming, Diana Julie

2007-01-01

274

Rim versus Non-Rim States in the Arctic Region: Prospects for a Zero-Sum Game or a Win-Win One?  

Directory of Open Access Journals (Sweden)

Full Text Available The present paper aims to develop a critical approach on one of the most urgent energy security challenges: the Arctic region. Until recently, it was considered to be a frozen desert, upon which no one raised any legal demands or interests. The global warming, the technological development and the increased need for energy resources had transformed the frozen High North into a very hot spot, where states like US, Canada, Norway, Denmark or Russia started an energy race that threatens to escalate. The Arctic became a strategic area given its opportunities: besides the energy resources, new commercial routes could become available for a longer period of time. But, due to legal uncertainties, the lack of coherent and direct legal procedures of international law, the Arctic game is an open one, in which any state can intervene and ask for a solution that is suitable for its interests. This aspect complicates even further the already unstable region. Some of the actors see the region as an international area, as a common good, where everyone has the right to explore or exploit, while the rim states see the Arctic in sovereign rights terms. Therefore, the game tends to complicate as non-rim players (the EU, China, Japan, NATO and South Korea want to intervene in the region and try to influence its development.

Ana-Maria Ghimi?

2013-09-01

275

FIB-NanoSIMS-TEM Coordinated Study of a Wark-Lovering Rim in a Vigarano Type A CAI  

Science.gov (United States)

Wark-Lovering (WL) rims are thin multi layered mineral sequences that surround most Ca, Al-rich inclusions (CAIs). Unaltered WL rims are composed of the same primary high temperature minerals as CAIs, such as melilite, spinel, pyroxene, hibonite, perovskite, anorthite and olivine. It is still unclear whether the rim minerals represent a different generation formed by a separate event from their associated CAIs or are a byproduct of CAI formation. Several models have been proposed for the origins of WL rims including condensation, flashheating, reaction of a CAI with a Mg-Si-rich reservoir (nebular gas or solid); on the basis of mineralogy, abundances of trace elements, O and Mg isotopic studies. Detailed mineralogical characterizations of WL rims at micrometer to nanometer scales have been obtained by TEM observations, but so far no coordinated isotopic - mineralogical studies have been performed. Thus, we have applied an O isotopic imaging technique by NanoSIMS 50L to investigate heterogeneous distributions of O isotopic ratios in minerals within a cross section of a WL rim prepared using a focused ion beam (FIB) instrument. After the isotopic measurements, we determine the detailed mineralogy and microstructure of the same WL FIB section to gain insight into its petrogenesis. Here we present preliminary results from O isotopic and elemental maps by NanoSIMS and mineralogical analysis by FE-SEM of a FIB section of a WL rim in the Vigarano reduced CV3 chondrite.

Cai, A.; Ito, M.; Keller, L. P.; Ross, D. K.; Nakamura-Messenger, K.

2010-01-01

276

Solitary myofibroma of the lumbar vertebra: adult case  

International Nuclear Information System (INIS)

We present the first known adult case of solitary myofibroma of bone, which affected a lumbar vertebra in a 33-year-old male. Radiography identified a purely lytic lesion with a sclerotic rim in the right pedicle of L1. CT showed an expansile lytic lesion with a sclerotic rim. MRI of the lesion revealed an isointense signal on T1-weighted images, an inhomogeneously hyperintense signal on T2-weighted images, and marked enhancement with gadolinium. Pathological study showed a mixed picture of nodular proliferation of spindle-shaped myoid cells and hemangiopericytomatous proliferation of short spindle/small round cells. The tumor cells were immunoreactive for smooth muscle actin and immunonegative for desmin. This case of solitary myofibroma of bone is exceptionally rare because of its occurrence in an adult older than 20 years of age and its location at an extra-craniofacial site. (orig.)

277

Solitary myofibroma of the lumbar vertebra: adult case  

Energy Technology Data Exchange (ETDEWEB)

We present the first known adult case of solitary myofibroma of bone, which affected a lumbar vertebra in a 33-year-old male. Radiography identified a purely lytic lesion with a sclerotic rim in the right pedicle of L1. CT showed an expansile lytic lesion with a sclerotic rim. MRI of the lesion revealed an isointense signal on T1-weighted images, an inhomogeneously hyperintense signal on T2-weighted images, and marked enhancement with gadolinium. Pathological study showed a mixed picture of nodular proliferation of spindle-shaped myoid cells and hemangiopericytomatous proliferation of short spindle/small round cells. The tumor cells were immunoreactive for smooth muscle actin and immunonegative for desmin. This case of solitary myofibroma of bone is exceptionally rare because of its occurrence in an adult older than 20 years of age and its location at an extra-craniofacial site. (orig.)

Konishi, E.; Yanagisawa, A. [Kyoto Prefectural University of Medicne, Department of Pathology, Kyoto (Japan); Mazaki, T.; Urata, Y. [Kyoto City Hospital, Department of Pathology, Kyoto (Japan); Tanaka, K.; Kanoe, H.; Ikenaga, M. [Kyoto City Hospital, Department of Orthopedic Surgery, Kyoto (Japan); Hayakawa, K. [Kyoto City Hospital, Department of Radiology, Kyoto (Japan)

2007-06-15

278

Rim15 and the crossroads of nutrient signalling pathways in Saccharomyces cerevisiae  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract In recent years, the general understanding of nutrient sensing and signalling, as well as the knowledge about responses triggered by altered nutrient availability have greatly advanced. While initial studies were directed to top-down elucidation of single nutrient-induced pathways, recent investigations place the individual signalling pathways into signalling networks and pursue the identification of converging effector branches that orchestrate the dynamical responses to nutritional cues. In this review, we focus on Rim15, a protein kinase required in yeast for the proper entry into stationary phase (G0. Recent studies revealed that the activity of Rim15 is regulated by the interplay of at least four intercepting nutrient-responsive pathways.

Cameroni Elisabetta

2006-04-01

279

Rim15 and the crossroads of nutrient signalling pathways in Saccharomyces cerevisiae.  

Science.gov (United States)

In recent years, the general understanding of nutrient sensing and signalling, as well as the knowledge about responses triggered by altered nutrient availability have greatly advanced. While initial studies were directed to top-down elucidation of single nutrient-induced pathways, recent investigations place the individual signalling pathways into signalling networks and pursue the identification of converging effector branches that orchestrate the dynamical responses to nutritional cues. In this review, we focus on Rim15, a protein kinase required in yeast for the proper entry into stationary phase (G0). Recent studies revealed that the activity of Rim15 is regulated by the interplay of at least four intercepting nutrient-responsive pathways. PMID:16759348

Swinnen, Erwin; Wanke, Valeria; Roosen, Johnny; Smets, Bart; Dubouloz, Frédérique; Pedruzzi, Ivo; Cameroni, Elisabetta; De Virgilio, Claudio; Winderickx, Joris

2006-01-01

280

Theoretical and experimental research of hammer forging process of RIM from AZ31 magnesium alloy  

Directory of Open Access Journals (Sweden)

Full Text Available The results of theoretical analysis and experimental tests of hammer forging process of rim part from AZ31 magnesium alloy are presented in this paper. On the basis of numerical simulation results, the analysis of limiting phenomena was made. These phenomena include: possibility of overlapping presence, not filling of die impression, overheating of material and cracks. The results of theoretical analysis provided the support for planning of experimental tests in industrial conditions. Forging tests were conducted in one of Polish forming plants, applying steam-air hammer of blow energy 63 kJ. On the basis of experimental verification, it was stated that it is possible to obtain rim forging from AZ31 alloy of assumed quality in the hammer forging process.

A. Gontarz

2014-10-01

 
 
 
 
281

Astronaut John Young on rim of Plum crater gathering lunar rock samples  

Science.gov (United States)

Astronaut John W. Young, commander of the Apollo 16 lunar landing mission, stands on the rim of Plum crater while collecting lunar rock samples at Station No.1 during the first Apollo 16 extravehicular activity (EVA-1) at the Descartes landing site. This scene, looking eastward, was photographed by Astronaut Charles M. Duke Jr., lunar module pilot. The small boulder in the center foreground was chip sampled by the crewmen. Plum crater is 40 meters in diameter and 10 meters deep. The Lunar Roving Vehicle is parked on the far rim of the crater. The gnomon, which is used as a photographic reference to establish local vertical sun angle, scale, and lunar color, is deployed in the center of the picture. Young holds a geological hammer in his right hand.

1972-01-01

282

Upper lid transconjunctival versus transcutaneous approach for fracture repair of the lateral orbital rim.  

Science.gov (United States)

The use of the lower eyelid transconjunctival approach in the setting of orbital trauma has becoming increasingly popular in recent years. However, experience has found that access to the lateral orbital rim can be somewhat limited with this type of incision. Many authors supplement the approach with a lateral canthotomy in order to gain adequate access laterally. Although usually well tolerated, there can be side effects associated with this incision. We examine the upper lid transconjunctival approach to the lateral orbital rim. Furthermore, we compare this technique to the more traditional transcutaneous approaches used for orbital trauma. We have found this technique to be safe, effective, and to cause no more complications than the more traditional approaches. PMID:20548223

Langsdon, Phillip R; Rohman, Grant T; Hixson, Rob; Stumpe, Matthew R; Metzinger, Stephen E

2010-07-01

283

Lybia Montes: A Safe, Ancient Cratered Terrain, Mars Surveyor Landing Site at the Isidis Basin Rim  

Science.gov (United States)

The Isidis basin rim may be key to understanding Mars' past with future lander missions: this area enables the mission objective to explore Mars' climatic and geologic history, including the search for liquid water and evidence of prior or extant life in ancient terrains. While two safe candidate landIng sites for Mars Pathfinder were identified in Isidis Planitia, and one is being pursued for the Mars Surveyor 2001 Lander, the region around Isidis Planitia. in contrast to Tharsis for example, has only been lightly studied. The advent of new high resolution data sets provides an opportunity to re-assess the geologic context of this Impact basin and its rim within the Martian geologic sequence as a candidate site for studying Mars' ancient cratered terrain and ancient hydrosphere. This reexamination is warranted by the various hypotheses that Isidis was once filled with ice or water.

Haldemann, A. F. C.; Anderson, R. C.; Harbert, W.

2000-01-01

284

Radiometric tracing of dross and aluminium oxide in rimmed steel ingots  

International Nuclear Information System (INIS)

The reduction of mechanical properties of rimmed steels may be caused by the local increase in the content of non-metallic impurities generated in the process of casting accompanied by forced interruption of the cast-iron mould boil. The contamination of rimmed steel with dross was studied by radioactive labelling of the dross with 141Ce in form of oxide and 46Sc as the Al-Sc alloy. The radioactive tracers were added to the steel surface and the ingots were mechanically covered. The results of operating trials proved unambiguously that dross penetrated from the surface to the ingot body, the highest impurity levels were found in the neighbourhood of the head and heal of the ingot and along the longitudinal axis of the rolled sections. (author). 2 figs., 2 tabs., 3 refs

285

Asia/Pacific Rim renewable energy market assessments by the State of Hawaii  

International Nuclear Information System (INIS)

The State of Hawaii has begun to encourage its economic growth and diversification by increasing the export of U.S. energy, environment, ocean, and information technologies. Hawaii's Strategic Technology Market Assessment and Development (STMAD) program promotes the transfer of U.S. technology into Asia and the Pacific Rim, locations having phenomenal growth potential and vast technological infrastructure demands. The STMAD program is managed by the State's Department of Business, Economic Development and Tourism (DBEDT). Under the auspices of STMAD, the Hawaii Natural Energy Institute (HNEI) of the University of Hawaii is assessing biomass energy resources of Asian and Pacific Rim countries to identify and investigate sustainable energy markets. This paper reviews the STMAD program and reports findings of renewable energy assessment performed by HNEI and DBEDT. (author)

286

Development of SFR Research and Integration Management System (S-RIMS)  

International Nuclear Information System (INIS)

Up to the present, the management of research and development (R and D) for a sodium cooled fast reactor (SFR) could be individually performed on each project without an organic relationship. However, a more systemic and effective integrated management of a project is required because the research and development environment is currently changing. Thus, we developed a Research and Integration Management System for SFR (S-RIMS) based on the enterprise project management (EPM) solution. The functional goals of the S-RIMS are as follows: 1. Provide data that show the progress and status of a project 2. Manage the design process and R and D products 3. Share the consistent design data between sub-projects

287

Performance improvement of the RIMS device for application to FFDL system of the fast reactor  

International Nuclear Information System (INIS)

In the fast reactors, it's crucial to install an effective failed fuel detection and location (FFDL) system for the purpose of protecting workers from radiation exposure and reducing radiation contamination. A new type of FFDL technique focused on the gas tagging method has been proposed by using resonance ionization mass spectrometry (RIMS) for the isotope analysis of the Ar cover gas. Though precise analysis of ppt level Kr and Xe in Ar needed is difficult because of the Ar+ and Ar2+ ions generated by the photoelectron, we could successfully decrease the signal amount of these ions by applying an electrode with a slit-type hole to permit ppt level detection of 80Kr without any obvious Ar2 interference. Some promising methods concerning effective utilization of laser light are also presented to increase the photoionization efficiency for further reliability improvement of RIMS in the FFDL system. (author)

288

Distribution of skeletal muscle involvement in distal myopathy with rimmed vacuoles  

International Nuclear Information System (INIS)

Distribution of skeletal muscle involvement was studied clinically and by computed tomography (CT) in 6 cases (including 5 sporadic cases) with rimmed vacuolar distal myopathy. Although a predilection for the extensors in the lower leg was noted as stressed so far, there were certain cases without this selectivity. The thigh disclosed a selectivity that the flexors and adductors were severely affected while the m. quadriceps femoris was well preserved. The selectivity in the thigh was still found in the cases without selectivity in the lower leg. The neck flexors were also liable to be involved. In addition, CT revealed no compensatory hypertrophy of the specific muscles which was clearly shown in the thigh of distal muscular dystrophy (Miyoshi). The pattern of skeletal muscle involvement was thought to be a characteristic feature of distal myopathy with rimmed vacuoles. It was visualized very clearly and easily by CT of skeletal muscles although it could be noted to a certain degree by physical examination. (author)

289

Dorsal acetabular rim radiographic view for evaluation of the canine hip  

International Nuclear Information System (INIS)

A dorsal acetabular rim (DAR) radiographic view and positioning was devised to visualize the weight-bearing of the acetabulum of dogs for hip evaluation. The DAR view was performed on 250 dogs including 38 breeds. Both males and females were evaluated; ages ranged from six weeks to 11 years. The value of this technique is to evaluate the dorsal rim of the acetabulum for damage and secondary osteoarthritic changes, to correlate palpation of joint capsule laxity and crepitation with the radiographic appearance, to show acetabular filling, and to have an objective reproducible tool for determining whether a hip is normal, dysplastic or injured. This view is recommended as part of the routine procedure for hip examination

290

Computed tomography of temporal bone pneumatization: 1. Normal pattern and morphology.  

Science.gov (United States)

The pneumatization of 141 "normal" temporal bones on computed tomography (CT) was evaluated in 100 patients (age range, 6-85 years). Because of the controversy surrounding the sclerotic squamomastoid (mastoid), temporal bones with this finding were discarded. A CT index of pneumatization was based on the pneumatized area and the number of cells seen within a representative scanning section. Results suggest that squamomastoid pneumatization follows the classic normal distribution and does not correlate with age, gender, or laterality. A high degree of symmetry was found in 41 patients who had both ears examined. In 35% of all temporal bones, the petrous apex was pneumatized, concordant with the findings of other investigators. Pneumatization extending into other regions of the temporal bone corresponded linearly with squamomastoid pneumatization. Air-cell configuration was variable. Air-cell size tended to increase progressively from the mastoid antrum. The scutum "pseudotumor" appearance caused by incomplete pneumatization was seen frequently, and should not be mistaken for mastoiditis or an osteoma. Thick sections producing partial-volume effect may also produce this spurious finding. Therefore, when searching for mucosal thickening due to mastoiditis, large air cells should preferably be analyzed. PMID:3875250

Virapongse, C; Sarwar, M; Bhimani, S; Sasaki, C; Shapiro, R

1985-09-01

291

Aeolian activity during the last 9200 calendar years BP along the southwestern coastal rim of Norway  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Aeolian sand deposits intercalated with organic layers have been reported from Holocene sediment sequences below the marine limit (ML) at twelve sites along the coastal rim of southwestern Norway for over a century. This study, based on field investigations, stratigraphical analysis, radiocarbon dates and archaeological information, has revealed several phases of aeolian activity. The premises and factors permitting sand drift, as well as the timing of this activity, have been compiled and sy...

Prøsch-danielsen, Lisbeth; Selsing, Lotte

2009-01-01

292

Oxygen Isotope Measurements of a Rare Murchison Type A CAI and Its Rim  

Science.gov (United States)

Ca-, Al-rich inclusions (CAIs) from CV chondrites commonly show oxygen isotope heterogeneity among different mineral phases within individual inclusions reflecting the complex history of CAIs in both the solar nebula and/or parent bodies. The degree of isotopic exchange is typically mineral-specific, yielding O-16-rich spinel, hibonite and pyroxene and O-16-depleted melilite and anorthite. Recent work demonstrated large and systematic variations in oxygen isotope composition within the margin and Wark-Lovering rim of an Allende Type A CAI. These variations suggest that some CV CAIs formed from several oxygen reservoirs and may reflect transport between distinct regions of the solar nebula or varying gas composition near the proto-Sun. Oxygen isotope compositions of CAIs from other, less-altered chondrites show less intra-CAI variability and 16O-rich compositions. The record of intra-CAI oxygen isotope variability in CM chondrites, which commonly show evidence for low-temperature aqueous alteration, is less clear, in part because the most common CAIs found in CM chondrites are mineralogically simple (hibonite +/- spinel or spinel +/- pyroxene) and are composed of minerals less susceptible to O-isotopic exchange. No measurements of the oxygen isotope compositions of rims on CAIs in CM chondrites have been reported. Here, we present oxygen isotope data from a rare, Type A CAI from the Murchison meteorite, MUM-1. The data were collected from melilite, hibonite, perovskite and spinel in a traverse into the interior of the CAI and from pyroxene, melilite, anorthite, and spinel in the Wark-Lovering rim. Our objectives were to (1) document any evidence for intra-CAI oxygen isotope variability; (2) determine the isotopic composition of the rim minerals and compare their composition(s) to the CAI interior; and (3) compare the MUM-1 data to oxygen isotope zoning profiles measured from CAIs in other chondrites.

Matzel, J. E. P.; Simon, J. I.; Hutcheon, I. D.; Jacobsen, B.; Simon, S. B.; Grossman, L.

2013-01-01

293

The significance of evaluating the craniolateral acetabular rim for hip dysplasia  

International Nuclear Information System (INIS)

The weight-bearing part of the canine hip is its dorsocraniolateral portion. On the radiograph the configuration of the craniolateral acetabular rim is important for evaluation of hip dysplasia. Changes in formation of this area should be differentiated from artefacts due to malpositioning. When the pelvis is tilted dorsally, the cranial acetabular rim is superimposed on the cranioventral acetabular contour and the acetabular roof. The craniolateral contour then seems to be missing. The contours of a ventrally tilted pelvis do not overlap, but it is difficult to discern the craniolateral rim. The reference points for Norberg-Olsson's measurements are difficult to choose in both cases and the angles may vary up to 10 degrees. A symmetrically positioned pelvis shows one point of reference for Norberg-Olsson's measurement where the cranial acetabular contour, the cranioventral margin and the acetabular roof intersect. Therefore poor positioning of the pelvis for radiographic evaluation of hip dysplasia should be avoided when using Norberg-Olsson's measurements

294

A Compact Array imaging survey of southern bright-rimmed clouds  

CERN Document Server

We have carried out a radio-wavelength imaging survey of 45 bright-rimmed clouds (BRCs), using the Australia Telescope Compact Array to characterise the physical properties in their ionised boundary layers. We detected radio emission from a total of 25 clouds and using a combination of Digitised Sky Survey and mid-infrared MSX micron images classified the emission into that associated with the ionised cloud rims, that associated with embedded possible massive YSOs and that unlikely to be associated with the clouds at all. A total of 18 clouds display radio emission clearly associated with the cloud rim and we determine the ionising photon flux illuminating these clouds and the electron density and pressure of their ionised boundary layers. Using a global estimate for the interior molecular pressure of these clouds we show that the majority are likely to be in pressure equilibrium and hence are currently being shocked by photoionisation-induced shocks. We identify those clouds where the predicted ionising phot...

Thompson, M A; White, G J

2004-01-01

295

Young stellar population of bright-rimmed clouds BRC 5, BRC 7 and BRC 39  

Science.gov (United States)

Bright-rimmed clouds (BRCs), illuminated and shaped by nearby OB stars, are potential sites of recent/ongoing star formation. Here we present an optical and infrared photometric study of three BRCs: BRC 5, BRC 7 and BRC 39 to obtain a census of the young stellar population, thereby inferring the star formation scenario, in these regions. In each BRC, the Class I sources are found to be located mostly near the bright rim or inside the cloud, whereas the Class II sources are preferentially outside, with younger sources closer to the rim. This provides strong support to sequential star formation triggered by radiation-driven implosion due to the ultraviolet radiation. Moreover, each BRC contains a small group of young stars being revealed at its head, as the next-generation stars. In particular, the young stars at the heads of BRC 5 and BRC 7 are found to be intermediate-/high-mass stars, which, under proper conditions, may themselves trigger further star birth, thereby propagating star formation out to long distances.

Panwar, Neelam; Chen, W. P.; Pandey, A. K.; Samal, M. R.; Ogura, K.; Ojha, D. K.; Jose, J.; Bhatt, B. C.

2014-09-01

296

Young Stellar Population of the Bright-Rimmed Clouds BRC 5, BRC 7 and BRC 39  

CERN Document Server

Bright-rimmed clouds (BRCs), illuminated and shaped by nearby OB stars, are potential sites of recent/ongoing star formation. Here we present an optical and infrared photometric study of three BRCs: BRC 5, BRC 7 and BRC 39 to obtain a census of the young stellar population, thereby inferring the star formation scenario, in these regions. In each BRC, the Class I sources are found to be located mostly near the bright rim or inside the cloud, whereas the Class II sources are preferentially outside, with younger sources closer to the rim. This provides strong support to sequential star formation triggered by radiation driven implosion due to the UV radiation. Moreover, each BRC contains a small group of young stars being revealed at its head, as the next-generation stars. In particular, the young stars at the heads of BRC 5 and BRC 7 are found to be intermediate/high mass stars, which, under proper conditions, may themselves trigger further star birth, thereby propagating star formation out to long distances.

Panwar, Neelam; Pandey, A K; Samal, M R; Ogura, K; Ojha, D K; Jose, J; Bhatt, B C

2014-01-01

297

Energy indicators series: analyzing the energy-related evidence of economic transition in the Pacific Rim  

International Nuclear Information System (INIS)

In recent years, much attention has been focused upon the Asian Pacific countries as constituting an economic 'miracle' over the last two decades. Economic growth in the Pacific Rim has been higher than in any other area of the world. The rapid industrialization process and its impact on the economies of these countries, at both macro and micro levels, are discussed widely in the economic literature. Of particular interest are the fundamental structural changes these countries have experienced in their transition to industrialized economies. This instalment of the annual 'Energy indicators' series concentrates on Pacific Rim countries, namely Hong Kong, the Philippines, Singapore, South Korea, Taiwan and Thailand. Similar to other experiences, rapid economic growth in these countries has been accompanied by 'spectacular' growth in demand for energy. Therefore, this year's paper not only underlines certain trends in these six energy markets but also attempts to test the phenomenon 'threshold country', i.e., shifting from the developing to the industrialized world by using common indicators and methodologies. The analysis starts with a comparison of energy intensities. Section 2 provides an overview of the socio-economic and energy indicators of the Pacific Rim countries. Section 3 introduces a standard econometric model on the most dynamic consuming sector, namely transport. Section 4 presents the projections of consumption in this sector and discusses policy issues. Sthis sector and discusses policy issues. Some concluding remarks in Section 6 complete the paper. (author)

298

Infarct rim: effect of hyperglycemia on direct current potential and [14C]2-deoxyglucose phosphorylation  

International Nuclear Information System (INIS)

Focal ischemia was produced by occlusion of the right middle cerebral artery (MCA) in normo- and hyperglycemic rats. In the cortical infarct rim, regional [14C]2-deoxyglucose [( 14C]2-DG) phosphorylation was correlated to spontaneous transient changes in extracellular potassium recorded as direct current (DC) potential deflections. In normoglycemic rats the DC potential showed transient but recurrent deflections in the first hours following MCA occlusion. The 2-DG phosphorylation was elevated by 200% in the same area. In contrast, hyperglycemic rats had no, or a single, deflection of the DC potential in the rim, and the 2-DG phosphorylation remained normal. The same pattern was obtained by application of 3 M KCl to the exposed cortex. In normoglycemia potassium application resulted in recurrent deflections of the DC potential, and 2-DG phosphorylation increased in most parts of the hemisphere. Hyperglycemic animals had a nearly stable DC potential, and 2-DG phosphorylation increased only in the tissue area situated directly below the site of potassium application. The results indicate that metabolism in the cortical infarct rim is stimulated by spontaneous and recurrent changes in extracellular potassium--a phenomenon that may be related to spreading depression--and that the metabolism remained normal in the same area in hyperglycemic animals owing to an inhibition of transient increases of extracellular potassium

299

Does Oxygen Isotopic Heterogeneity in Refractory Inclusions and Their Wark-Lovering Rims Record Nebular Repressing?  

Science.gov (United States)

Large systematic variations in O-isotopic compositions found within individual mineral layers of rims surrounding Ca-, Al-rich inclusions (CAIs) and at the margins of some CAIs imply formation from distinct environments [e.g., 1-3]. The O-isotope compositions of many CAIs preserve a record of the Solar nebula gas believed to initially be O-16-rich (delta O-17 less than or equal to -25%0) [4-5]. Data from a recent study of the compact Type A Allende CAI, A37, preserve a diffusion profile in the outermost 70 micrometers of the inclusion and show greater than 25%0 variations in delta O-17 within its 100 micrometer-thick Wark-Lovering rim (WL-rim) [3]. This and comparable heterogeneity measured in several other CAIs have been explained by isotopic mixing between the O-16-rich Solar reservoir and a second O-16-poor reservoir (probably nebular gas) with a planetary-like isotopic composition, e.g., [1,2,3,6]. However, there is mineralogical and isotopic evidence from the interiors of CAIs, in particular those from Allende, for parent body alteration. At issue is how to distinguish the record of secondary reprocessing in the nebula from that which occurred on the parent body. We have undertaken the task to study a range of CAI types with varying mineralogies, in part, to address this problem.

Simon, J. I.; Matzel, J. E. P.; Simon, S. B.; Weber, P. K.; Grossman, L.; Ross, D. K.; Hutcheon, I. D.

2013-01-01

300

49 CFR 571.110 - Tire selection and rims and motor home/recreation vehicle trailer load carrying capacity...  

Science.gov (United States)

...column of Table I. Passenger car tire means a tire intended for use on passenger...Rim type designation means the industry of manufacturer's designation... Vehicle maximum load on the tire means that load on an...

2010-10-01

 
 
 
 
301

49 CFR 571.120 - Tire selection and rims and motor home/recreation vehicle trailer load carrying capacity...  

Science.gov (United States)

...spare tire assemblies for use on those vehicles. S4. Definitions. All terms defined in the Act and the rules and standards...2) “E” indicates The European Tyre and Rim Technical Organisation (3) “J” indicates Japan Automobile Tire...

2010-10-01

302

75 FR 9436 - Aleris Blanking and Rim Products, Inc., a Division of Aleris International, Inc., Terre Haute, IN...  

Science.gov (United States)

...DEPARTMENT OF LABOR Employment and Training Administration [TA-W-72,041] Aleris Blanking and Rim Products, Inc., a Division of Aleris International, Inc., Terre Haute, IN; Notice of Affirmative Determination...

2010-03-02

303

Facts about Broken Bones  

Science.gov (United States)

... How Do Broken Bones Heal? Your bones are natural healers. At the location of the fracture, your bones will produce lots of new cells and tiny blood vessels that rebuild the bone. These cells cover both ends of the broken part of the bone and close up the break until it's as good as new. ...

304

Development of high sensitive and reliable FFD and sodium leak detection technique for fast reactor using RIMS  

International Nuclear Information System (INIS)

The high sensitive fuel failure and sodium leak detection technique for fast reactors has been developed using laser resonance ionization mass spectrometry (RIMS) method. The RIMS is suitable for the isotope analysis of the element of ultra trace level, since there is no increase of the background by interfering ion and isobaric interference except for measuring element, because the measuring element is selectively ionized. The RIMS was applied to measure the artificially blended xenon and krypton gas (tag gas) which is used for the pressurized steel capsule of in-pile creep rupture experiment in the experimental fast reactor Joyo. This system can measure the tag gas isotopic ratios of about 100 ? 102 ppb level and the measured results could identify tag gas. The RIMS system can detect stable xenon nuclides and 133Xe in the sample of cover gas which was stored in the stainless steel container during the fuel failure simulation test in Joyo. The result shows the applicability of the RIMS system for assuming the burn-up of the failed fuel subassembly by the ratio of stable and radioactive xenon isotopes. The RIMS is then applied to detect a small amount of sodium leaks from the fast reactor cooling system. In case of detecting sodium isotopes using RIMS, the aerodynamic lens was newly introduced, which can transfer aerosols at atmospheric pressure into a vacuum chamber while increasing the aerosol density at the same time. We performedl density at the same time. We performed the experiments using stable isotope 23Na to evaluate the detection sensitivity of the prototype system. The preliminary test results showed that prototype system could easily detect sodium aerosol of 2.7 ppt, of which sensitivity is 400 times higher than the conventional sodium leak detectors currently used. The RIMS system is expected to be a promising innovative instrumentation system not only for Monju, but also for the future sodium cooled fast reactors. (author)

305

Ossificans myositis: inflammatory changes and contrast enhancement of adjacent bone shown by MR imaging; Myosite ossifiante circonscrite: remaniements osseux deceles en IRM  

Energy Technology Data Exchange (ETDEWEB)

The authors report a case of ossificans myositis, in which magnetic resonance imaging (MRI) showed inflammatory changes of the adjacent bone. T 1 weighted fat saturation sequence with gadolinium injection showed enhancement of medullary and cortical bone. This potentially mistaking pattern must be known, to avoid mis diagnosing with malignant osseous tumor, specially before achievement of the characteristic pattern of zonal maturation and its calcified rim. (authors). 15 refs., 6 figs.

David, H.; Jolles, E.; Le Friant, G.; Silvestre, A.; Sarrazin, J.L.; Gordoliani, Y.S. [Hopital des Armees du Val-de-Grace, 75 - Paris (France)

1995-07-01

306

A ceramic/slag interface as an analog for accretion of hot refractory objects and rim formation  

Science.gov (United States)

Refractory inclusions or Ca-Al-rich inclusions (CAI's) from carbonaceous chondrites span a wide range of bulk compositions that cannot be explained either by segregation from a gas of solar composition at different points in the condensation sequence or by fractional crystallization from a parent liquid. CAI's are commonly rimmed by Wark-Lovering (W-L) rims, a series of nearly monomineralic layers that have been a source of controversy since the variety of rim sequences occurring on different types of CAI's from Allende were described. The origin of these distinctive features has not yet been resolved, with proponents of accretion, condensation, flash heating, ablation, evaporation, etc. Rims have generated considerable interest because they potentially contain clues to conditions experienced by CAI's after the formation of the inclusion and prior to incorporation into the parent body. Ceramic bricks in contact with hot steel slag may produce reaction products in rim-like fashion similar to those found in CAI's. The similarity between the mineralogy of blast furnace slags and CAI's has long been recognized, with both containing unusual phases not found in terrestrial materials. We provide here a comparison between a ceramic brick/slag multiple-layered interface and a multiple-layered interface between a melilite-perovskite object and a melilite-spinel object in the Allende inclusion USNM 4691-1. These results have implications in interpreting the origin of rims and the textures and compositions of CAI's.

Paque, J. M.; Bunch, T. E.

307

Chondrites: The Compaction of Fine Matrix and Matrix-like Chondrule Rims  

Science.gov (United States)

Primitive chondritic meteorites mainly consist of chondrules, sulfide+/-metal, and fine-grained matrix. The most unequilibrated chondrites preserve in their phase compositions and, to a lesser degree, their textures, many details about processes that occurred in the solar nebula. On the other hand, much of the textural evidence records processes that occurred in or on the parent body. I suggest that the low-porosity of chondrule matrix and matrix-like rims reflects compaction processes that occurred in asteroid-size bodies, and that neither matrix lumps nor compact matrix-like rims on chondrules could have achieved their observed low porosities in the solar nebula. Recent theoretical studies by Donn and Meakin (1) and Chokshi et al. (2) have concluded that grain-grain sticking in the solar nebula mainly produces fluffy structures having very high porosities (probably >>50%). If these structures grow large enough, they can provide an aerogel-like matrix that can trap chondrules as well as metal and sulfide grains, and thus form suitable precursors of chondritic meteorites. However, the strength of any such structure formed in the solar nebula must be a trivial fraction of that required to survive passage through the Earth's atmosphere in order to fall as a meteorite. The best evidence of accretionary structures appears to be that reported by Metzler et al. (3). They made SEM images of entire thin sections of CM chondrites, and showed that, in the best preserved chondrites, rims are present on all entitities--on chondrules, chondrule fragments, refractory inclusions, etc. A study by Krot and Wasson (4) shows a more complex situation in ordinary chondrites. Although matrix is common, a sizable fraction of chondrules are not surrounded by matrix-like rims. As summarized by Rubin and Krot (1995), there are reports of small textural and compositional differences between matrix lumps and mean matrix-like chondrule rims, but there is so much overlap in properties between these two classes that I will assume that they can be treated as parts of a single statistical population. Published SEM images of matrix lumps and matrix-like rims show them to be relatively compact. Although some porosity is surely present as indicated by broad-beam electron-probe analysis totals 100%, it never reaches values comparable to those expected from low-velocity collisions in the solar nebula. Most chondrite researchers seem to hold that the low porosities reflect efficient packing of each grain as it accreted to the assemblage (i.e., as micrometer-size grains gradually covered the surface of a chondrule to form the matrix-like rim). I find this process very difficult to envision. If the velocities are low, the fluffy structures of Dodd and Meakin (1) should result; if the velocities are high, then rim erosion would seem to be more probable than growth. A possible scenario that avoids this dilemma is to form cm to m-size fluffy structures in low-turbulence regions of the nebular midplane. During accretion of these larger objects these experienced enough compaction to form tough, low-porosity (but unequilibrated) chondrites. If no chondrules were in a region, matrix lumps formed; if chondrules were widely separated, a matrix-like rim resulted. And, if chondrules were close to other chondrules or chondrule fragments, only small amounts of intervening fine-grained materials now separate them from their neighbors. During the compaction event, gas and dust migration occurred, and matrix filled all interstices, as now observed in the most primitive chondrites. According to this picture there could have been more diversity in the fine-grained nebular component before compaction occurred. These differences would be best preserved in matrix-like rims and matrix lumps. Much of the interchondrule matrix should consist of homogenized dust that was mixed during compaction-induced transport. References: [1] Donn B. and Meakin P. (1989) Proc. LPSC 19th, 577-580. [2] Chokshi A. et al. (1993) Astrophys. J., 407, 806-819. [3] Metzler K. et al. (1992) GCA,

Wasson, J. T.

1995-09-01

308

Subperiosteal ganglion associated with Paget's disease of bone  

International Nuclear Information System (INIS)

Tumoral lesions related to Paget's disease may be classified as malignant, benign or pseudotumoral. While sarcomatous degeneration is the most feared complication, awareness of benign and pseudotumoral lesions is essential for assisting in accurate histological interpretation of the biopsy sample, which may avoid unnecessary repeat biopsies. We present the first case of a juxta-articular subperiosteal ganglion associated with Paget's disease, with classic imaging characteristics, especially on CT examination. The well-defined soft tissue mass at the medial aspect of the obturator rim, adjacent to a small fracture in pagetic quadrilateral plate, showed an ossified rim and internal gas lucencies, these being the hallmarks of a juxta-articular subperiosteal ganglion. On MRI, the lesion was of intermediate signal intensity on T1-weighted sequences, increased signal intensity on T2-weighted sequences, with rim enhancement after gadolinium contrast injection and preservation of fatty marrow signal of the underlying pagetic bone. Identification of the entity avoided an unnecessary biopsy or surgical intervention. (orig.)

309

Malignant bone tumors  

International Nuclear Information System (INIS)

Clinicoroentgenologic semiotics of malignant bone tumors as well as metastatic bone tumors are presented. Diagnosis of malignant and metastatic bone tumors should be always complex, representing a result of cooperation of a physician, roentgenologist, pathoanatomist

310

Bone marrow biopsy  

Science.gov (United States)

Biopsy - bone marrow ... A bone marrow biopsy may be done in the health care provider's office or in a hospital. The sample may be taken from the pelvic or breast bone. Sometimes, other areas are used. Marrow is removed ...

311

Food and Your Bones  

Science.gov (United States)

... Home » Food and Your Bones Food and Your Bones The food that you eat can affect your ... by taking multivitamins or supplements . Good-for-Your-Bones Foods Food Nutrient Dairy products such as low- ...

312

Silicon and oxygen self diffusion in enstatite polycrystals: the Milke et al. (2001) rim growth experiments revisited  

Science.gov (United States)

Milke et al. (Contrib Mineral Petrol 142:15-26, 2001) studied the diffusion of Si, Mg and O in synthetic polycrystalline enstatite reaction rims. The reaction rims were grown at 1,000°C and 1 GPa at the contacts between forsterite grains with normal isotopic compositions and a quartz matrix extremely enriched in 18O and 29Si. The enstatite reaction rim grew from the original quartz-forsterite interface in both directions producing an inner portion, which replaced forsterite and an outer portion, which replaced quartz. Here we present new support for this statement, as the two portions of the rim are clearly distinguished based on crystal orientation mapping using electron backscatter diffraction (EBSD). Milke et al. (Contrib Mineral Petrol 142:15-26, 2001) used the formalism of LeClaire (J Appl Phys 14:351-356, 1963) to derive the coefficient of silicon grain boundary diffusion from stable isotope profiles across the reaction rims. LeClaire's formalism is designed for grain boundary tracer diffusion into an infinite half space with fixed geometry. A fixed geometry is an undesired limitation in the context of rim growth. We suggest an alternative model, which accounts for simultaneous layer growth and superimposed silicon and oxygen self diffusion. The effective silicon bulk diffusivity obtained from our model is approximately equal within both portions of the enstatite reaction rim: DSi,Eneff=1.0-4.3×10-16 m2 s-1. The effective oxygen diffusion is relatively slow in the inner portion of the reaction rim, DO,Eneff=0.8-1.4×10-16 m2 s-1, and comparatively fast, DO,Eneff=5.9-11.6×10-16 m2 s-1, in its outer portion. Microstructural evidence suggests that transient porosity and small amounts of fluid were concentrated at the quartz-enstatite interface during rim growth. This leads us to suspect that the presence of an aqueous fluid accelerated oxygen diffusion in the outer portion of the reaction rim. In contrast, silica diffusion does not appear to have been affected by the spatial variation in the availability of an aqueous fluid.

Abart, R.; Kunze, K.; Milke, R.; Sperb, R.; Heinrich, W.

313

The Enigmatic Bench Unit of Endeavour Crater Rim in Meridiani Planum, Mars  

Science.gov (United States)

For the first 2680 sols of its mission, the Mars Exploration Rover Opportunity traversed across essentially the same rocks: sulfur-rich sandstones known as the Burns formation. On August 8, 2011 Opportunity completed a ~21 km traverse from Victoria crater to the rim of the ~22 km diameter Endeavour crater where it crossed a slightly raised smooth bench unit that surrounds an interior core of higher standing and more rugged terrain on a rim segment named Cape York. As recognized by its distinctive morphologic character evident in orbital images, the inward sloping bench feature is found associated with portions of other segments of the discontinuous raised rim of Endeavour crater. Viewed by Opportunity, it appears as platy, fractured, relatively light-toned outcrop that is fine-grained, lacks hematite concretions and in places hosts veins of Ca- and S-rich composition, likely due to precipitation of gypsum in fractures that cut the bench unit (1). The bench outcrop target named Grasberg included a grind using the Rock Abrasion Tool (RAT) to obtain a cleaner surface for the Alpha Particle X-ray Spectrometer chemistry measurement compared with the initially investigated target named Deadwood. In addition to its greater strength than Burns formation as determined by the RAT grind operation, Grasberg and other examples of the bench unit have lower S, higher Cl and other elemental characteristics that depart from typical Burns formation. Thus the 'Grasberg unit' clearly represents a distinct rock type compared to the Meridiani plains. A second unit makes up the exposed core of the Cape York rim segment. Known as Shoemaker formation, it is composed of breccias that are recognized as a suevite deposit produced from the Endeavour impact event (1). The Shoemaker formation appears to be onlapped by the Grasberg unit with Burns formation onlapping it (1). However, a well-exposed section observed in a wedge-shaped fracture known as Whim Creek on the northeast portion of the Cape York bench clearly presents Grasberg rocks above Burns rocks. Erosion of a plunging synclinal form could explain this apparent inverted relationship, or it reveals that the Grasberg unit is younger than Burns formation. But this latter interpretation implies that Grasberg rocks, which have been observed only at the Endeavour rim, have been stripped off of Burns formation everywhere else. The Grasberg bench unit has recently been encountered in an isthmus setting between two low knobs of presumed Shoemaker formation called Nobbys Head and Sutherland Point just south of Cape York. The isthmus also presents Grasberg as topographically elevated above the Burns formation rocks. Despite its broad, smooth exposure, no remnants of Burns formation have been found on top of Grasberg at this location or anywhere on the Cape York bench. So the stratigraphic relationship between Grasberg and Burns rocks remains enigmatic. At the time of writing, Opportunity is at the edge of Solander Point, another bench feature on the northern tip of a rim segment known as Cape Tribulation. The erosional expression of this example appears different from those examined previously and perhaps offers the best chance to understand stratigraphic relationships. 1. S. W. Squyres et al., Ancient impact and aqueous processes at Endeavour Crater, Mars. Science 336, 570 (2012).

Ruff, S. W.

2013-12-01

314

RIMS: An Integrated Mapping and Analysis System with Applications to Earth Sciences and Hydrology  

Science.gov (United States)

A web-based information and computational system for analysis of spatially distributed Earth system, climate, and hydrologic data have been developed. The System allows visualization, data exploration, querying, manipulation and arbitrary calculations with any loaded gridded or vector polygon dataset. The system's acronym, RIMS, stands for its core functionality as a Rapid Integrated Mapping System. The system can be deployed for a Global scale projects as well as for regional hydrology and climatology studies. In particular, the Water Systems Analysis Group of the University of New Hampshire developed the global and regional (Northern Eurasia, pan-Arctic) versions of the system with different map projections and specific data. The system has demonstrated its potential for applications in other fields of Earth sciences and education. The key Web server/client components of the framework include (a) a visualization engine built on Open Source libraries (GDAL, PROJ.4, etc.) that are utilized in a MapServer; (b) multi-level data querying tools built on XML server-client communication protocols that allow downloading map data on-the-fly to a client web browser; and (c) data manipulation and grid cell level calculation tools that mimic desktop GIS software functionality via a web interface. Server side data management of the system is designed around a simple database of dataset metadata facilitating mounting of new data to the system and maintaining existing data in an easy manner. RIMS contains "built-in" river network data that allows for query of upstream areas on-demand which can be used for spatial data aggregation and analysis of sub-basin areas. RIMS is an ongoing effort and currently being used to serve a number of websites hosting a suite of hydrologic, environmental and other GIS data.

Proussevitch, A. A.; Glidden, S.; Shiklomanov, A. I.; Lammers, R. B.

2011-12-01

315

Technical Efficiency and Port Competition: Revisiting the Bohai Economic Rim, China  

Directory of Open Access Journals (Sweden)

Full Text Available The Bohai Economic Rim plays an important role in supporting China’s economic growth. For this research, we selected nine main ports in the region to study whether intra-port competition or corporatization would improve efficiency. Using a panel fixed effect model and stochastic frontier model, we found that the technical efficiency of selected ports is significantly influenced by the time of the initial public offering than by regional competition. The results are supportive and encouraging for policy makers to move toward the decentralized port governance in China.

Grace Wang

2012-12-01

316

Geologic evolution of the east rim of the Hellas basin, Mars  

Science.gov (United States)

The east rim of the Hellas basin, one of the largest obvious impact features on Mars, is studied. The distribution of geologic materials in the region is documented, and their modes of origin are constrained based on their geomorphologic characteristics. Superposition relationship and crater size-frequency distributions allow the relative ages of the geologic units to be determined and provide information regarding the timing and extent of the geologic processes emplacing and modifying the surface materials. Systematic analysis of the degradation of the Hellas basin is used to illustrate the sequence of events and interplay of geologic processes which control the evolution of many regions on Mars.

Crown, David A.; Price, Katherine H.; Greeley, Ronald

1992-01-01

317

Neutron beam research in the Pacific Rim region - an Australian perspective  

International Nuclear Information System (INIS)

A program of research in neutron scattering was established in Australia in the early 1960's, shortly after the reactor HIFAR commenced full power operation. The program has included elements of regional cooperation from the very early days. A report is given on the present status of australian neutron scattering research, and the activities (including several major new developments) in other Pacific Rim countries are briefly reviewed. Given the increasing sophistication of neutron scattering facilities and techniques, the case for regional cooperation is strongly advocated. 13 refs., 1 tab

318

Improvements in RIMS Isotopic Precision: Application to in situ atom-limited analyses  

International Nuclear Information System (INIS)

Resonance ionization mass spectrometry offers high sensitivity and elemental selectivity in microanalysis, but the isotopic precision attainable by this technique has been limited. Here we report instrumental modifications to improve the precision of RIMS isotope ratio measurements. Special attention must be paid to eliminating pulse-to-pulse variations in the time-of-flight mass spectrometer through which the photoions travel, and resonant excitation schemes must be chosen such that the resonance transitions can substantially power-broadened to cover the isotope shifts. We report resonance ionization measurements of chromium isotope ratios with statistics-limited precision better than 1%.

319

Improvements in RIMS isotope precision: applications to in situ atom-limited isotopic analysis  

International Nuclear Information System (INIS)

Resonance ionization mass spectrometry offers high sensitivity and elemental selectivity in microanalysis, but the isotopic precision attainable by this technique has been limited. Here we report instrumental modifications to improve the precision of RIMS isotope ratio measurements. Special attention must be paid to eliminating pulse-to-pulse variations in the time-of-flight mass spectrometer through which the photoions travel, and resonant excitation schemes must be chosen such that the resonance transitions can be substantially power-broadened to cover the isotope shifts. We report resonance ionization measurements of chromium isotope ratios with statistics-limited precision better than 1%.

320

The rim effect and other high-burnup modeling for NRC fuel performance codes  

International Nuclear Information System (INIS)

The U.S. Nuclear Regulatory Commission (NRC) has recently initiated a new program to review data on the material properties of fuel and cladding at high burnup levels. The objective of this program is to update NRC fuel performance models within fuel performance codes to improve their predictive capability to rod-average burnup levels of 60 GWd/MTM. Models being reviewed for improvement at the higher burnup levels are fission gas release, fuel swelling, gap conductance, fuel thermal conductivity, pellet rim structure, radial power distribution, cladding corrosion/hydriding, and cladding mechanical properties

 
 
 
 
321

Wake Flow Simulations for a Mid-Sized Rim Driven Wind Turbine  

Energy Technology Data Exchange (ETDEWEB)

The onshore land where wind farms with conventional wind turbines can be places is limited by various factors including a requirement for relatively high wind speed for turbines' efficient operations. Where such a requirement cannot be met, mid-and small-sized turbines can be a solution. In the current paper simulations for near and for wakes behind a mid-sized Rim Driven Wind Turbine developed by Keuka Energy LLC is analyzed. The purposes of this study is to better understand the wake structure for more efficient wind farm planning. Simulations are conducted with the commercial CFD software STARCCM+

Rob O. Hovsapian; Various

2014-06-01

322

Positron emission tracking of individual particles in particle-laden rimming flow  

Science.gov (United States)

The motion of a single tracer particle in particle-laden rimming flows is investigated experimentally by means of Positron Emission Particle Tracking (PEPT). Semi-dilute suspensions, with a volume fraction of 8% of heavy particles are considered. The trajectory of the tracer particle is monitored for several thousand cylinder revolutions and related to the optically recorded drift of the large-scale granular segregation bands developing in the cylinder. Results of the data analysis provide first insights into the relation between behaviour of individual particles and the spatiotemporal dynamics displayed by the macroscopic particle-segregation patterns.

Denissenko, P.; Guyez, E.; Thomas, P. J.; Parker, D. J.; Seville, J. P. K.

2014-05-01

323

[Potentialities of temporal bone CT in the diagnosis of chronic purulent otitis media and its complications].  

Science.gov (United States)

Temporal bone CT was used to examine a group of 87 patients with chronic purulent otitis media (103 temporal bones). The patients' age ranged from 2 to 74 years. A scheme was developed and proposed to evaluate the temporal bone by CT. The CT signs of chronic purulent otitis media uncomplicated by cholesteatoma and those of cholesteatomic purulent otitis were identified. The CT symptomatology of chronic purulent otitis includes: sclerotic changes in the bone tissue of the mastoid process, impaired pneumatization of the cavities of the middle ear, including the tympanic cavity, destructive changes in auditory ossicles, carious changes in the walls of the cavities of the middle ear. The CT semiotics of cholesteatoma depends on its site and spread into the temporal bone and includes as follows: deformation of the epitympanum due to soft tissue mass-induced destruction of the lateral wall; the dilated entrance into the antrum; the presence of a cavity with the sclerosed walls in the antromastoid area; carious changes in the auditory ossicles; the displacement of a chain of ossicles medially or laterally in relation to the initial site of cholesteatoma. CT reflects carious changes in the walls of the cavities of the middle ear, including the roof and labyrinthine wall of the tympanum, which allows labyrinthine fistula and intracranial cholesteatomic complications. The study of the temporal bone by the proposed scheme may reveal anomalies and the specific features of its structure: the presentation of the sigmoid sinus, the high elevation of the bulb of the jugular vein, diverticulum of the latter, the low standing of the bottom of the ACH. PMID:15462050

Zelikovich, E I

2004-01-01

324

Bone demineralization  

Science.gov (United States)

Crew members of the Gemini 4, Gemini 5, and Gemini 7 missions were compared regarding skeletal changes in three major anatomic sites with respect to changes in skeletal density during space flight. Bone-mass changes have been found for the command pilot and the pilot of each mission in the conventional os calcis section, in the combined sections covering 60 percent of the os calcis, and in hand phalanges 5-2 and 4-2. Comparison of radiographically determined losses in X-ray absorbence with X-ray absorbence losses in healthy young men subjected to bedrest immobilization for the same length of time showed that losses for the crewmembers exceeded losses for the bedrest subjects in all cases; this was an indication that restriction of body movement did not represent the only factor involved.

Mack, P. B.; Vose, G. P.; Vogt, F. B.; Lachance, P. A.

1971-01-01

325

Paget's sarcoma of bone  

International Nuclear Information System (INIS)

The most sinister complication of Paget's disease is malignant degeneration. The true etiology of Paget's disease remains unproven and unknown. The relative incidence of sarcoma ranges from 0.9% to 20% depending upon the population source. The anatomical distribution of lesions is similar to that of uncomplicated Paget's disease except for the high incidence in the humerus and rare occurrence in the spine. Approximately 50% of the lesions histologically represent osteosarcomas, with fibrosarcoma, fibrous histiocytoma, chondrosarcoma and giant cell tumor rarely occurring. The radiographic presentation is most commonly lytic, but sclerotic and mixed patterns occur. Cortical destruction and soft tissue mass are the cardinal radiographic signs. Malignant periosteal response is seldom found associated with Paget's sarcoma. The most common sites are femur, humerus, pelvis, skull and tibia. The prognosis is fatal at a very rapid rate. There are but a few isolated cases of long-term survival reported. (orig.)

326

The CT flare response of metastatic bone disease in prostate cancer  

Energy Technology Data Exchange (ETDEWEB)

Background New or worsening bone lesions in patients responding to treatment, known as the flare phenomenon is well described on 99mTc-MDP bone scintigraphy, but to our knowledge has not previously been described on CT. The appearance of new or worsening bone sclerosis on CT in patients with prostate cancer may therefore be erroneously classified as disease progression. Purpose To assess the incidence of osteoblastic healing flare response at 3-month CT assessment in patients with castrate-resistant prostate cancer and to identify associated features that enable differentiation from progressive metastatic bone disease at 3 months. Material and Methods CT scans of 67 patients with castrate-resistant prostate cancer undergoing treatment were reviewed by a radiologist blinded to clinical outcome. Changes in number, size, and density of metastatic bone lesions were documented and Response Evaluation Criteria in Solid Tumours (RECIST) in soft tissue lesions, alkaline phosphatase, prostate specific antigen, and 99mTc-MDP bone scans were used for correlation. Results Of the 39 patients who had 3- and 6-month follow-up, eight patients (21%) demonstrated an increase in number, size, or density of sclerotic lesions on the 3-month CT scan despite improvement in PSA and soft tissue lesions. Three out of eight patients (8%) maintained partial response/remained stable at follow-up and were defined as showing a flare response: in this group bone metastases evident on CT showed a qualitative and quantitative increase in density and no lesions faded at 3 months. In contrast, in all patients who progressed at 3 months by PSA/RECIST criteria (n = 8) bone lesions showed a mixed pattern with some lesions increasing and others decreasing in density. Conclusion The incidence of flare response of metastatic bone disease evident at 3-month post-treatment CT in patients with prostate cancer undergoing systemic treatment is 8%. In patients with falling PSA and stable/responding soft tissue disease at 3 months an increase in bone sclerosis in the absence of fading bone metastases can be interpreted as flare and is likely to represent a response

Messiou, Christina; deSouza, Nandita M. (Cancer Research UK Clinical Magnetic Resonance Research Group, Inst. of Cancer Research and Royal Marsden NHS Foundation Trust, Surrey (United Kingdom)), email: Christina.Messiou@icr.ac.uk; Cook, Gary (Dept. of Nuclear Medicine, Royal Marsden NHS Foundation Trust, Surrey (United Kingdom)); Reid, Alison H.M.; Attard, Gerhardt; Dearnaley, David; deBono, Johann S. (Inst. of Cancer Research and Royal Marsden NHS Foundation Trust, Surrey (United Kingdom))

2011-06-15

327

Bone grafting: An overview  

Directory of Open Access Journals (Sweden)

Full Text Available Bone grafting is the process by which bone is transferred from a source (donor to site (recipient. Due to trauma from accidents by speedy vehicles, falling down from height or gunshot injury particularly in human being, acquired or developmental diseases like rickets, congenital defects like abnormal bone development, wearing out because of age and overuse; lead to bone loss and to replace the loss we need the bone grafting. Osteogenesis, osteoinduction, osteoconduction, mechanical supports are the four basic mechanisms of bone graft. Bone graft can be harvested from the iliac crest, proximal tibia, proximal humerus, proximal femur, ribs and sternum. An ideal bone graft material is biologically inert, source of osteogenic, act as a mechanical support, readily available, easily adaptable in terms of size, shape, length and replaced by the host bone. Except blood, bone is grafted with greater frequency. Bone graft indicated for variety of orthopedic abnormalities, comminuted fractures, delayed unions, non-unions, arthrodesis and osteomyelitis. Bone graft can be harvested from the iliac crest, proximal tibia, proximal humerus, proximal femur, ribs and sternum. By adopting different procedure of graft preservation its antigenicity can be minimized. The concept of bone banking for obtaining bone grafts and implants is very useful for clinical application. Absolute stability require for successful incorporation. Ideal bone graft must possess osteogenic, osteoinductive and osteocon-ductive properties. Cancellous bone graft is superior to cortical bone graft. Usually autologous cancellous bone graft are used as fresh grafts where as allografts are employed as an alloimplant. None of the available type of bone grafts possesses all these properties therefore, a single type of graft cannot be recomm-ended for all types of orthopedic abnormalities. Bone grafts and implants can be selected as per clinical problems, the equipments available and preference of the surgeon. A search for ideal bone graft is on and may continue till time to time. [Vet World 2010; 3(4.000: 198-200

D. O. Joshi

2010-08-01

328

Nonthermal emission properties of the northwestern rim of supernova remnant RX J0852-4622  

CERN Document Server

The supernova remnant (SNR) RX J0852-4622 (Vela Jr., G266.6-1.2) is one of the most important SNRs for investigating the acceleration of multi-TeV particles and the origin of Galactic cosmic rays because of its strong synchrotron X-ray and TeV gamma-ray emission, which show a shell-like morphology similar to each other. Using the XMM-Newton archival data consisting of multiple pointing observations of the northwestern rim of the remnant, we investigate the spatial properties of the nonthermal X-ray emission as a function of distance from an outer shock wave. All X-ray spectra are well reproduced by an absorbed power-law model above 2 keV. It is found that the spectra show gradual softening from a photon index 2.56 in the rim region to 2.96 in the interior region. We show that this radial profile can be interpreted as a gradual decrease of the cutoff energy of the electron spectrum due to synchrotron cooling. By using a simple spectral evolution model that includes continuous synchrotron losses, the spectral s...

Kishishita, Tetsuichi; Uchiyama, Yasunobu

2013-01-01

329

Spatial-temporal variability of coastline in Bohai Rim based on fractal dimension  

Science.gov (United States)

This paper extracted the spatial distribution of the continental coastline of Bohai Rim utilizing Remote Sensing and GIS spatial analysis techniques, and calculated the fractal dimension of the coastline by boxcounting method, with a time from 1990 to 2010. Moreover, we analyzed the characteristics of spatialtemporal variability of the coastline's length and fractal dimension, the relationship between the large scales length change and fractal dimension change. During the research period, the coastline length of the study area increased progressively and the most significant change in coastline length was found in Tianjin Municipality. Especially after 2000, the coastline length entered a period of rapid growth. In addition, the fractal dimension of the overall coastline of the study area was between the fractal dimensions of the regional coastlines and was close to the maximum fractal dimensions of these regional coastlines. The fractal dimension of the coastline in Bohai Rim was increasing during the research period, large scale project such as ports construction, reduced tortuous degree of the coastline.

Xu, Ning; Gao, Zhiqiang; Ning, Jicai; Liu, Xiangyang

2014-10-01

330

A Radio and Mid-Infrared Survey of Northern Bright-Rimmed Clouds  

CERN Document Server

We have carried out an archival radio, optical and infrared wavelength imaging survey of 44 Bright-Rimmed Clouds (BRCs) using the NRAO/VLA Sky Survey (NVSS) archive, images from the Digitised Sky Survey (DSS) and the Midcourse Space eXperiment (MSX). The data characterise the physical properties of the Ionised Boundary Layer (IBL) of the BRCs. A total of 25 clouds display 20 cm radio continuum emission that is associated with their bright optical rims. The ionising photon flux illuminating these clouds, the ionised gas pressure and the electron density of the IBL are determined. We derive internal molecular pressures for 9 clouds using molecular line data from the literature and compare these pressures to the IBL pressures to determine the pressure balance of the clouds. We find three clouds in which the pressure exerted by their IBLs is much greater than that measured in the internal molecular material. A comparison of external pressures around the remaining clouds to a global mean internal pressure shows th...

Morgan, L K; Urquhart, J S; Miao, G J; Miao, Glenn.J.White & J.

2001-01-01

331

Definition imaging of an orebody with the radio imaging method (RIM)  

International Nuclear Information System (INIS)

Waste rock dilution is an economic concern in the planning and design of mining methods for mineralized ore zones. Diamond core drilling and mineralogical examination of core are routinely used to determine the general shape of the ore body. Drilling on closer centers enhances the definition of the mineralization and oregrade across the orebody. In a practical sense, drilling time and cost limit definition. Crosshole scanning between drillholes with the radio imaging method (RIM) has been used to map changes in mineralization in the rock mass. The magnitude and phase of the RIM radio wave depend on the electrical conductivity of the rock mass. The conductivity strongly depends on the percent mineralization. Since the attenuation rate and phase constants of the radio wave are proportional to the one half power of conductivity, the measured crosshole radio wave data can be processed in a tomography algorithm to reconstruct images (map the change in conductivity (mineralization)). The tomography image enhances definition in the orebody while reducing the number of drillholes. This paper compares reconstructed images of the radio wave propagation constants to percent mineralization in the ore body

332

Effects of Magnetic Field and FUV Radiation on the Structures of Bright-rimmed Clouds  

CERN Document Server

The bright-rimmed cloud SFO 22 was observed with the 45 m telescope of Nobeyama Radio Observatory in the ^{12}CO (J = 1-0), ^{13}CO (J = 1-0), and C^{18}O (J = 1-0) lines, where well-developed head-tail structure and small line widths were found. Such features were predicted by radiation-driven implosion models, suggesting that SFO 22 may be in a quasi-stationary equilibrium state. We compare the observed properties with those from numerical models of a photo-evaporating cloud, which include effects of magnetic pressure and heating due to strong far-ultraviolet (FUV) radiation from an exciting star. The magnetic pressure may play a more important role in the density structures of bright-rimmed clouds, than the thermal pressure that is enhanced by the FUV radiation. The FUV radiation can heat the cloud surface to near 30 K, however, its effect is not enough to reproduce the observed density structure of SFO 22. An initial magnetic field of 5 \\mu G in our numerical models produces the best agreement with the ob...

Motoyama, Kazutaka; Shang, Hsien; Hasegawa, Tatsuhiko

2013-01-01

333

Candida glabrata endophthalmitis following penetrating keratoplasty in a patient with negative donor rim culture  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Candida glabrata endophthalmitis following keratoplasty is rare and almost always associated with positive donor rim culture. Case presentation A 63-year-old patient, diagnosed Fuch's endothelial dystrophy in both eyes underwent a penetrating keratoplasty in his right eye. He had multiple underlying medical problems, which included diabetes mellitus, hypertension, hypoadrenalism on oral dexamethasone and fatty liver secondary to hypertrigliseridemia. He developed multiple suture abscesses, corneal haziness, retrocorneal white plaques and a level of hypopyon two weeks after an uneventful penetrating keratoplasty in his right eye. Cultures of the donor button and the transport media culture were negative. Candida glabrata was isolated successfully from the aqueous and vitreous taps. He was treated with a combination of topical, intracameral, intravitreal and intravenous Amphotericin B. His final visual acuity remained poor due to the haziness of the corneal button. Conclusion Candida glabrata endophthalmitis following penetrating keratoplasty can occur in negative donor rim and transport media cultures. The growth of the organism is facilitated by the patient's immunocompromised status. Awareness by the ophthalmologists and appropriate choice of antibiotics are mandatory in this challenging condition.

Ibrahim Mohtar

2010-06-01

334

Review of psychiatric services to mentally disordered offenders around the Pacific Rim.  

Science.gov (United States)

This article was commissioned to collate and review forensic psychiatric services provided in a number of key Pacific Rim locations in the hope that it will assist in future dialogue about service development. The Board of the Pacific Rim College of Psychiatrists identified experts in forensic psychiatry from Australia, Canada, China, Hong Kong, Japan, Russia, Singapore, Taiwan, and the US. Each contributor provided an account of issues in their jurisdiction, including mental health services to mentally disordered offenders in prison, competence or fitness to stand trial, legal insanity as a defense at trial, diminished responsibility, and special forensic services available, including forensic hospitals and community forensic mental health services. Responses have been collated and are presented topic by topic and country by country within the body of this review. The availability of mental health screening and psychiatric in-reach or forensic liaison services within prisons differed considerably between countries, as did provisioning of community forensic mental health and rehabilitation services. Diversion of mentally disordered offenders to forensic, state, or hybrid hospitals was common. Legal constructs of criminal responsibility (insanity defense) and fitness to stand trial ("disability") are almost universally recognized, although variably used. Disparities between unmet needs and resourcing available were common themes. The legislative differences between contributing countries with respect to the mental health law and criminal law relating to mentally disordered offenders are relatively subtle. The major differences lie in operationalizing and resourcing forensic services. PMID:24249353

Every-Palmer, Susanna; Brink, Johann; Chern, Tor P; Choi, Wing-Kit; Hern-Yee, Jerome Goh; Green, Bob; Heffernan, Ed; Johnson, Sarah B; Kachaeva, Margarita; Shiina, Akihiro; Walker, David; Wu, Kevin; Wang, Xiaoping; Mellsop, Graham

2014-03-01

335

Analysis of physical processes affecting restructuring of UO2 fuel in Rim-zone  

International Nuclear Information System (INIS)

The purpose of the presented paper is the analysis of the processes affecting so-called 'rim-zone' formation in UO2 and the development of the model describing isotope content profiles at extended burnup. The influence of rim-zone and extended burnup on fuel temperatures is also considered. A brief review of the worldwide models for fission rate and isotope content profiles at extended burnup is given. In this frame, a new model for for prediction of radial profiles of burnup, fission rate and plutonium isotopes have been developed in the TRINITY (Russia). The results from the comparison of the model predictions with experimental data show that the model has good predictability. A new model describing the conditions of dislocation loop nucleation from interstitial atom clusters on fission spikes is also proposed in this paper. The results of the model show that the fuel grain diameter significantly affects the concentration of point defects and dislocation loops. The paper presents the results from the RTOP code calculations of fuel temperature, taking into account non-uniform fission rate and thermal conductivity degradation as result of burnup increasing

336

A bright-rimmed cloud sculpted by the H ii region Sh2-48  

CERN Document Server

To characterize a bright-rimmed cloud embedded in the HII region Sh2-48 searching for evidence of triggered star formation. We carried out observations towards a region of 2'x2' centered at RA=18h 22m 11.39s, dec.=-14deg 35m 24.81s (J2000) using the Atacama Submillimeter Telescope Experiment (ASTE; Chile) in the 12CO J=3-2,13CO J=3-2, HCO+ J=4-3, and CS J=7-6 lines with an angular resolution of about 22". We also present radio continuum observations at 5 GHz carried out with the Jansky Very Large Array (JVLA; EEUU) interferometer with a synthetized beam of 7"x5". The analysis of our molecular observations reveals the presence of a relatively dense clump with n(H_2)~3x10^3 cm^-3, located in projection onto the interior of the HII region Sh2-48. The emission distribution of the four observed molecular transitions has, at VLSR~38 kms^-1, morphological anti-correlation with the bright-rimmed cloud as seen in the optical emission. From the new radio continuum observations we identify a thin layer of ionized gas lo...

Ortega, M E; Giacani, E; Rubio, M; Dubner, G

2013-01-01

337

Bone Marrow Diseases  

Science.gov (United States)

Bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. It contains immature cells, called stem cells. The ... help with blood clotting. If you have a bone marrow disease, there are problems with the stem ...

338

Bone Marrow Transplantation  

Science.gov (United States)

Bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. It contains immature cells, called stem cells. The ... platelets, which help the blood to clot. A bone marrow transplant is a procedure that replaces a ...

339

Bone scan in rheumatology  

International Nuclear Information System (INIS)

In this chapter a revision is made concerning different uses of bone scan in rheumatic diseases. These include reflex sympathetic dystrophy, osteomyelitis, spondyloarthropaties, metabolic bone diseases, avascular bone necrosis and bone injuries due to sports. There is as well some comments concerning pediatric pathology and orthopedics. (authors). 19 refs., 9 figs

340

Effect of head contact on the rim of the cup on the offset loading and torque in hip joint replacement.  

Science.gov (United States)

Head contact on the rim of the cup causes stress concentration and consequently increased wear. The head contact on the rim of the cup may in addition cause an offset load and torque on the cup. The head-rim contact resulting from microseparation or subluxation has been investigated. An analytical model has been developed to calculate the offset loading and resultant torque on the cup as a function of the translational displacement of the head under simplified loading condition of the hip joint at heel strike during a walking cycle. The magnitude of the torque on the cup was found to increase with the increasing translational displacement, larger diameter heads, eccentric cups, and the coefficient of friction of the contact. The effects of cup inclination, cup rim radius, and cup coverage angle on the magnitude of the torque were found to be relatively small with a maximum variation in the torque magnitude being lower than 20%. This study has shown an increased torque due to the head loading on the rim of the cup, and this may contribute to the incidence of cup loosening. Particularly, metal-on-metal hip joints with larger head diameters may produce the highest offset loading torque. PMID:23886972

Liu, Feng; Williams, Sophie; Jin, Zhongmin; Fisher, John

2013-11-01

 
 
 
 
341

[Bone and androgens].  

Science.gov (United States)

Sexual steroids are major determinants of skeletal maturation and steady state. Estrogens are mandatory in both sexes. They induce endochondral bone formation and growth plate knitting. Androgens are mainly active in male. They increase length and radial bone growth. These differences explain the duality of biomechanics in both sexes. Deep androgen deficiency induces rapid bone loss and increases bone fracture risk. The androgen treatment of andropause has weak rationale. Androgens interact with bone metabolism within the medulla-bone unit. They activate the whole osteoblastic lineage and interact with preosteoclastic regulation. Androgens found their place in bone metabolism regulation through RANK/osteoprotegerin and Wnt/sclerostin pathways. PMID:24332181

Weryha, Georges; Angelousi, Anna; Diehdiou, Demba; Cuny, Thomas

2014-02-01

342

[Imaging of bone metastases].  

Science.gov (United States)

Bone metastases are detected at initial diagnosis of cancer in 25% of cases and bone metastases are common in the course of a majority of cancer types. The spine and proximal long bones are the most affected sites. Knowledge of the basic radiological semiology is important to make the proper diagnosis of metastasis(s) bone(s), especially in situations in which the clinical context is not suggestive of metastases (such as cases where bone metastases are inaugural or cases of peripheral solitary metastasis). Tumor aggressiveness can be assessed at the level of the cortical bone and periosteum. Lodwick criteria are useful for the diagnosis of malignancy and tumor aggressiveness at initial diagnosis on plain radiographs, which are very important in the context of bone metastases. A CT scanner is required to confirm the malignancy of a bone lesion. MRI is complementary to the scanner including for the assessment of bone marrow involvement and tumor extensions. PMID:24184968

Amoretti, Nicolas; Thariat, Juliette; Nouri, Yasir; Foti, Pauline; Hericord, Olivier; Stolear, Sandy; Coco, Lucia; Hauger, Olivier; Huwart, Laurent; Boileau, Pascal

2013-11-01

343

Petrographic and SIMS pyrite sulfur isotope analyses of Ediacaran chert nodules: Implications for microbial processes in pyrite rim formation, silicification, and exceptional fossil preservation  

Science.gov (United States)

The lower Ediacaran Doushantuo Formation in the Yangtze Gorges area contains exceptionally preserved microfossils, including the earliest known animal resting eggs and embryos. These fossils are preserved in cm-sized chert nodules, which typically have a microbial mat fragment in the center, a silica cortex, a pyrite rim, and an outer rim of blocky calcite. Petrographic analysis indicates that the formation of the blocky calcite rim postdates that of the pyrite rim and silica cortex. The pyrite rim grew centripetally during early diagenesis, representing a reaction front that was determined by the dynamics between ambient Fe 2+ and H 2S, the latter of which was derived from bacterial sulfate reduction (BSR) of mat fragment in nodule center. The silica cortex was formed pervasively through replacement of carbonate sediments prior to compaction. Secondary ion mass spectroscopy (SIMS) sulfur isotopes of individual pyrite crystals (? 34S py - SIMS) in pyrite rims and matrices show highly positive values (15.2-39.8‰). The pyrite rims do not show an isotopic gradient between small crystals formed in outer rim during early diagenesis and large crystals formed in inner rim during subsequent overgrowth. Although rim pyrite in the same chert nodule has consistent ? 34S py - SIMS values, there are significant spatial and stratigraphic variations in ? 34S py - SIMS values of both matrix and rim pyrite. Overall, isotopic fractionation between pyrite and carbonate associated sulfate (CAS) is small (clay diagenesis. Like the pyrite rim, the silica cortex was also formed rapidly during early diagenesis, leading to the exceptional preservation of microfossils within these nodules.

Xiao, Shuhai; Schiffbauer, James D.; McFadden, Kathleen A.; Hunter, Jerry

2010-09-01

344

Fine-grained rims surrounding chondrules in the Tagish Lake carbonaceous chondrite: Verification of their formation through parent-body processes  

Science.gov (United States)

A petrographic and electron microscopic study of the carbonate-poor lithology of the Tagish Lake carbonaceous chondrite reveals that most chondrules contain many pseudomorphs of opaque nodules and are surrounded by phyllosilicate-rich altered zones that were formed by replacing enstatite and opaque nodules along the chondrule peripheries. Most chondrules and other coarse-grained components are surrounded by fine-grained rims, which are commonly disaggregated and partly lacking. The altered zones and the rims are compositionally and texturally similar, although they exhibit some differences in secondary minerals. In comparison, the rims and the host matrix show more significant differences in bulk chemical composition, texture, and mineralogy. The observations suggest that the chondrules and the rims experienced aqueous alteration simultaneously, whereas the rims and the matrix experienced aqueous alteration under distinct conditions. We also found a clast that contains multiple coarse-grained components embedded in a matrix and numerous smaller matrix clasts. The coarse-grained components in the clast have no rims, and the matrices of the clasts are mineralogically identical to the rims. The results suggest that the chondrules, other coarse-grained components, and their rims (generically referred to as chondrules/rims) and the clasts originated from a common precursor region in the meteorite parent-body that was different from the location where the host meteorite was finally lithified. That is, the chondrules/rims are actually clasts produced by brecciation and later transported and incorporated into the present host matrix. The rims are, therefore, remnants of matrix material that formerly filled interspaces between the chondrules and other coarse-grained components. This model is essentially consistent with those previously proposed for the carbonate-rich lithology of Tagish Lake and the hydrated chondrules/rims in the Vigarano and Mokoia CV3 chondrites.

Takayama, Akiko; Tomeoka, Kazushige

2012-12-01

345

Anorexia Nervosa and Bone  

Science.gov (United States)

Anorexia nervosa (AN) is a condition of severe low weight that is associated with low bone mass, impaired bone structure and reduced bone strength, all of which contribute to increased fracture risk., Adolescents with AN have decreased rates of bone accrual compared with normal-weight controls, raising addition concerns of suboptimal peak bone mass and future bone health in this age group. Changes in lean mass and compartmental fat depots, hormonal alterations secondary to nutritional factors contribute to impaired bone metabolism in AN. The best strategy to improve bone density is to regain weight and menstrual function. Oral estrogen-progesterone combinations are not effective in increasing bone density in adults or adolescents with AN, and transdermal testosterone replacement is not effective in increasing bone density in adult women with AN. However, physiologic estrogen replacement as transdermal estradiol with cyclic progesterone does increase bone accrual rates in adolescents with AN to approximate that in normal-weight controls, leading to a maintenance of bone density Z-scores. A recent study has shown that risedronate increases bone density at the spine and hip in adult women with AN. However, bisphosphonates should be used with great caution in women of reproductive age given their long half-life and potential for teratogenicity, and should be considered only in patients with low bone density and clinically significant fractures when non-pharmacological therapies for weight gain are ineffective. Further studies are necessary to determine the best therapeutic strategies for low bone density in AN. PMID:24898127

Misra, Madhusmita; Klibanski, Anne

2014-01-01

346

Summary of CFSSD-8 and Africa-RIM in preparation for CSD-20, 19-21 November 2012, Addis Ababa, Ethiopia  

...for Sustainable Development - Reporting Services (IISD RS), Sustainable Development, CFSSD, CFSSD-8, Africa-RIM, CSD-20, Eighth Session of the Committee on Food Security ...and Sustainable Development (CFSSD-8) and Africa Regional Implementation Meeting (Africa-RIM) in preparation for the Twentieth Session of the UN Commission on Sustainable ...Development (CFSSD-8), Eighth Session of the CFSSD, Africa Regional Implementation Meeting (Africa-RIM), Twentieth Session of the UN Commission on Sustainable (...CSD-20), Summary Report of the CFSSD-8 and Africa-RIM in preparation for CSD-20, 19-21 November 2012, Addis Ababa, Ethiopia Summary of ...

347

Quantitative analysis of hyperintensity rim sign surrounding MS plaque on T1 weighted images. Comparison with lacunar infarction  

International Nuclear Information System (INIS)

This study evaluated the incidence of MR findings showing a hyperintensity rim surrounding multiple sclerosis (MS) plaque on T1-weighted images using image analysis software. We also evaluate the efficacy of this MR finding for differentiating between MS and lacunar infarction. We reviewed T1-weighted images in clinically diagnosed MS patients who underwent MR imaging between February 2006 and July 2007. Two hundred and thirty-nine nodular low signal intensities over 5 mm in minimal diameter were observed in 39 MS patients. To compare the incidence of MR findings, we also reviewed T1-weighted images in randomly selected lacunar infarction patients who underwent MR imaging during the same period. There were 51 nodular low signal intensities over 5 mm in shortest diameter in 34 lacunar infarction patients. After standardization of MR images, we calculated each signal intensity at the plaque margin (M.I.) and surrounding white matter (Wh.I.) using plot-profile analysis. We judged that hyperintensity rim sign was positive when the M.I/Wh.I. ratio was over 1.05. Among 239 T1 low intensity plaques in 39 MS patients, hyperintensity rim sign was positive for 81 (33.9%) plaques in 21 (53.8%) patients. Among 51 T1 low intensity lesions in 34 lacunar infarction patients, hyperintensity rim sign was positive for only one lesion in one patient. There were significant differences in the incidence of hyperintensity rim sign between the two patients groups (p<0.0001). On quantitativeatients groups (p<0.0001). On quantitative analysis using imaging standardization and plot-profile analysis, hyperintensity rim sign was observed in one-third of T1 low intensity MS plaques. This finding seems to be useful to differentiate multiple sclerosis from lacunar infarction. (author)

348

MRI of degenerative bone marrow lesions in experimental osteoarthritis of canine knee joints  

Energy Technology Data Exchange (ETDEWEB)

Objective. The objective of this study was to determine the value of MRI in the detection of degenerative bone marrow abnormalities in an animal osteoarthritis model. Design. In 10 dogs with experimentally induced unilateral osteoarthritis of the knee, MRI was performed using two-dimensional spin-echo (2D-SE) and three-dimensional gradient-echo (3D-GE) imaging. Contrast enhanced T1-weighted 2D-SE sequences were also obtained after injection of gadolinium-DTPA. The results were compared with the gross and histopathologic findings and with radiography. Results. Histopathologic specimens revealed 21 osteosclerotic lesions and 5 intraosseous cysts. On 2D-SE images, 24 of 26 lesions were detected, while 21 of 26 lesions were identified on 2D-GE sequences. Radiography, including conventional tomography, demonstrated 9 of 26 lesions. Regardless of the sequence weighting, all osteosclerotic lesions appeared hypointense on MRI. Signal loss in bone sclerosis resulted primarily from the reduction of intact fat marrow, the increased bone density being of secondary importance. Quantitative signal analysis allowed approximate estimation of the grade of sclerosis. On postcontrast images, sclerotic bone remained hypointense, although significant but non-specific enhancement relative to the normal fat marrow was observed. The extent of contrast enhancement did not correlate with the grade of osteosclerosis. All five cysts were readily diagnosed by MRI. Cysts displayed either central or marginal contrast enhancement within their cavities. Conclusions. MRI provides a sensitive method for the diagnosis of osteoarthritic bone abnormalities, allowing their differentiation from most non-degenerative subarticular lesions. (orig.). With 1 tab.

Nolte-Ernsting, C.C.A. [Department of Diagnostic Radiology, University of Technology, Aachen, Pauwelsstrasse 30, D-52057 Aachen (Germany); Adam, G. [Department of Diagnostic Radiology, University of Technology, Aachen, Pauwelsstrasse 30, D-52057 Aachen (Germany); Buehne, M. [Department of Diagnostic Radiology, University of Technology, Aachen, Pauwelsstrasse 30, D-52057 Aachen (Germany); Prescher, A. [Department of Anatomy, University of Technology, Aachen (Germany); Guenther, R.W. [Department of Diagnostic Radiology, University of Technology, Aachen, Pauwelsstrasse 30, D-52057 Aachen (Germany)

1996-07-01

349

MRI of degenerative bone marrow lesions in experimental osteoarthritis of canine knee joints  

International Nuclear Information System (INIS)

Objective. The objective of this study was to determine the value of MRI in the detection of degenerative bone marrow abnormalities in an animal osteoarthritis model. Design. In 10 dogs with experimentally induced unilateral osteoarthritis of the knee, MRI was performed using two-dimensional spin-echo (2D-SE) and three-dimensional gradient-echo (3D-GE) imaging. Contrast enhanced T1-weighted 2D-SE sequences were also obtained after injection of gadolinium-DTPA. The results were compared with the gross and histopathologic findings and with radiography. Results. Histopathologic specimens revealed 21 osteosclerotic lesions and 5 intraosseous cysts. On 2D-SE images, 24 of 26 lesions were detected, while 21 of 26 lesions were identified on 2D-GE sequences. Radiography, including conventional tomography, demonstrated 9 of 26 lesions. Regardless of the sequence weighting, all osteosclerotic lesions appeared hypointense on MRI. Signal loss in bone sclerosis resulted primarily from the reduction of intact fat marrow, the increased bone density being of secondary importance. Quantitative signal analysis allowed approximate estimation of the grade of sclerosis. On postcontrast images, sclerotic bone remained hypointense, although significant but non-specific enhancement relative to the normal fat marrow was observed. The extent of contrast enhancement did not correlate with the grade of osteosclerosis. All five cysts were readily diagnosed by MRI. Cysts displayed either central od by MRI. Cysts displayed either central or marginal contrast enhancement within their cavities. Conclusions. MRI provides a sensitive method for the diagnosis of osteoarthritic bone abnormalities, allowing their differentiation from most non-degenerative subarticular lesions. (orig.). With 1 tab

350

Modelo de tumor experimental em rim de ratos / Experimental tumor model in rats kidney  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese O carcinossarcoma 256 de Walker tem despertado o interesse de muitos pesquisadores como modelo experimental para estudo da biologia tumoral. OBJETIVO: estabelecer um modelo de tumor renal que possa ser usado para estudar in vivo e in vitro, as alterações impostas pelas neoplasias. MÉTODOS: utilizado [...] s vinte ratos Wistar, machos, adultos, pesando entre 250-300 g, oriundos do Laboratório de Cirurgia Experimental da Universidade Federal do Ceará. Sob anestesia inalatória procedia-se uma pequena incisão supraumbilical, e com manobra delicada fazia-se a exposição do rim direito. Neste órgão eram inoculadas 3x10(5) células tumorais viáveis. Os animais então eram mantidos em gaiolas individuais com as mesmas condições ambientais e com água e dieta ad libitum. RESULTADOS: o Carcinossarcoma 256 de Walker, implantado no parênquima do rim direito de ratos Wistar apresentou índice de pega de 100%, e crescimento rápido, invadiu por contiguidade as estruturas vizinhas, porém sem apresentar metástases, no entanto, levando os animais a óbito no curso médio de 14 dias. CONCLUSÃO: o modelo de implante de tumor de Walker no parênquima do rim direito de ratos Wistar é eficiente, tem reprodutibilidade, apresentando um índice de pega de 100%, e permitindo seu uso em linhas de pesquisa. Abstract in english Walker carcinossarcoma 256 has a great interest as experimental model for studies on tumoral biology. OBJECTIVE: develop a kidney tumor model to be used in the evaluation of the biological behavior of neoplasms in vitro and in vivo environments. METHODS: twenty adult male Wistar rats weighting betwe [...] en 250-300 g were obtained from the Federal University of the Ceará Experimental Surgery Laboratory. Upon ether anesthesia, the right kidney of each animal was accessed through a supraumbelical incision and inoculated with a solution containing 3 x 10(5) tumor cells (Walker 256 carcinossarcoma tumor cells). Following anesthetic recovery the rats were returned to their cages, housed individually and allowed to eat and drink ad libitum. RESULTS: the post-operative average survival was 14 days. Tumor growth was encountered in all animals. The rats exhibited destruction of the kidney, invasion of the adjacent structures, but absence of metastasis. CONCLUSION: the kidney Walker tumor model proved to be an excellent tool for experimental studies on tumor behavior, due to its rapid growth and its easy reproduction.

Lúcio Flávio Gonzaga, Silva; Felipe dos Santos Dias, Soares; José Nilson Nunes, Anselmo; Daniel Mota Moura, Fé; João Luiz Barbosa Gurgel, Cavalcante; Manoel Odorico de, Moraes; Paulo Roberto Leitão de, Vasconcelos.

351

New prospects for plutonium speciation - CE-RIMS and CE-DAD-ICP-MS  

International Nuclear Information System (INIS)

Full text of publication follows: In the last years, capillary electrophoresis (CE)-ICP-MS has been applied successfully for the speciation of plutonium and neptunium [1] in aqueous solutions, especially in groundwater samples. To achieve lower detection limits and to determine complexing agents, two detection methods, namely RIMS and DAD, coupled with the separation technique CE are under investigation. A detection limit of 20 ppb was found for plutonium with an ICP-QMS, whereas with the coupling with a sector field ICP-HRMS 100 ppt could be detected. The off-line coupling of CE to the very sensitive resonance ionisation mass spectrometry (RIMS) with an absolute detection limit of 106 atoms gives new options. For this, a sample is injected into the CE-capillary and the separated oxidation states of Pu(III), Pu(VI/V) and Pu(IV) are collected in different fractions from which filaments are prepared for the RIMS measurements [2]. The migration times of the different Pu species have been previously calibrated by means of the CE-ICP-MS. The second innovation is the combination of a diode array detector (DAD) with the CE-ICP-MS. In addition to the information on the metal ions detected by the ICP-MS, the DAD can detect complexing agents like humic acid and also the electro-osmotic flow (EOF) by a suitable marker like acetone. This is necessary for internal standardisation of the migration times of the species in the capillary. By applying both detection methods, it is possible to determine in an anionic run free humic acid, humate complexed metal ions, and other (humate free) anionic metal species. In a cationic run, the free metal ions can be detected. This will enable the determination of complex formation constants. Related results will be presented at the conference. [1] B. Kuczewski et al.: Analytical Chemistry, 2003, 75, 6769-6774. [2] N. Trautmann et al.: Analytical and Bioanalytical Chemistry, 2004, 378, 348-355. (authors)

352

TRIGGERED STAR FORMATION AND YOUNG STELLAR POPULATION IN BRIGHT-RIMMED CLOUD SFO 38  

International Nuclear Information System (INIS)

We have investigated the young stellar population in and around SFO 38, one of the massive globules located in the northern part of the Galactic H II region IC 1396, using the Spitzer IRAC and MIPS observations (3.6-24 ?m), and followed up with ground-based optical photometric and spectroscopic observations. Based on the IRAC and MIPS colors and H? emission, we identify ?45 young stellar objects (Classes 0/I/II) and 13 probable pre-main-sequence candidates. We derive the spectral types (mostly K- and M-type stars), effective temperatures, and individual extinction of the relatively bright and optically visible Class II objects. Most of the Class II objects show variable H? emission as well as optical and near-infrared photometric variability, which confirm their 'youth'. Based on optical photometry and theoretical isochrones, we estimate the spread in stellar ages to be between 1 and 8 Myr with a median age of 3 Myr and a mass distribution of 0.3-2.2 Msun with a median value around 0.5 Msun. Using the width of the H? emission line measured at 10% peak intensity, we derive the mass accretion rates of individual objects to be between 10-10 and 10-8 Msun yr-1. From the continuum-subtracted H? line image, we find that the H? emission of the globule is not spatially symmetric with respect to the O-type ionizing star HD 206267, and the interstellar extinction toward the globule is also anomalous. We che globule is also anomalous. We clearly detect an enhanced concentration of YSOs closer to the southern rim of SFO 38 and identify an evolutionary sequence of YSOs from the rim to the dense core of the cloud, with most of the Class II objects located at the bright rim. The YSOs appear to be aligned along two different directions toward the O6.5V type star HD 206267 and the B0V type star HD 206773. This is consistent with the Radiation Driven Implosion (RDI) model for triggered star formation. Further, the apparent speed of sequential star formation is consistent with the speed of propagation of shocks in dense globules as derived from numerical simulations of RDI.

353

Modelo de tumor experimental em rim de ratos / Experimental tumor model in rats kidney  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese O carcinossarcoma 256 de Walker tem despertado o interesse de muitos pesquisadores como modelo experimental para estudo da biologia tumoral. OBJETIVO: estabelecer um modelo de tumor renal que possa ser usado para estudar in vivo e in vitro, as alterações impostas pelas neoplasias. MÉTODOS: utilizado [...] s vinte ratos Wistar, machos, adultos, pesando entre 250-300 g, oriundos do Laboratório de Cirurgia Experimental da Universidade Federal do Ceará. Sob anestesia inalatória procedia-se uma pequena incisão supraumbilical, e com manobra delicada fazia-se a exposição do rim direito. Neste órgão eram inoculadas 3x10(5) células tumorais viáveis. Os animais então eram mantidos em gaiolas individuais com as mesmas condições ambientais e com água e dieta ad libitum. RESULTADOS: o Carcinossarcoma 256 de Walker, implantado no parênquima do rim direito de ratos Wistar apresentou índice de pega de 100%, e crescimento rápido, invadiu por contiguidade as estruturas vizinhas, porém sem apresentar metástases, no entanto, levando os animais a óbito no curso médio de 14 dias. CONCLUSÃO: o modelo de implante de tumor de Walker no parênquima do rim direito de ratos Wistar é eficiente, tem reprodutibilidade, apresentando um índice de pega de 100%, e permitindo seu uso em linhas de pesquisa. Abstract in english Walker carcinossarcoma 256 has a great interest as experimental model for studies on tumoral biology. OBJECTIVE: develop a kidney tumor model to be used in the evaluation of the biological behavior of neoplasms in vitro and in vivo environments. METHODS: twenty adult male Wistar rats weighting betwe [...] en 250-300 g were obtained from the Federal University of the Ceará Experimental Surgery Laboratory. Upon ether anesthesia, the right kidney of each animal was accessed through a supraumbelical incision and inoculated with a solution containing 3 x 10(5) tumor cells (Walker 256 carcinossarcoma tumor cells). Following anesthetic recovery the rats were returned to their cages, housed individually and allowed to eat and drink ad libitum. RESULTS: the post-operative average survival was 14 days. Tumor growth was encountered in all animals. The rats exhibited destruction of the kidney, invasion of the adjacent structures, but absence of metastasis. CONCLUSION: the kidney Walker tumor model proved to be an excellent tool for experimental studies on tumor behavior, due to its rapid growth and its easy reproduction.

Lúcio Flávio Gonzaga, Silva; Felipe dos Santos Dias, Soares; José Nilson Nunes, Anselmo; Daniel Mota Moura, Fé; João Luiz Barbosa Gurgel, Cavalcante; Manoel Odorico de, Moraes; Paulo Roberto Leitão de, Vasconcelos.

2002-02-01

354

Reactive endosteal bone formation  

Energy Technology Data Exchange (ETDEWEB)

The microstructure of reactive endosteal new bone was examined using undecalcified ground sections in five pathologic conditions (bone metastasis from prostate cancer in seven cases, intervertebral osteochondrosis in five, Paget disease in four, chronic suppurative osteomyelitis in two, and fracture healing in one). To determine a basic form of rapid intramembranous bone formation, fetal rat calvaria and primitive bones made in clonal osteogenic cell culture were also observed. In slow bone-forming conditions, lamellar new bone was deposited on pre-existing trabecular surface and caused trabecular thickening on radiographs. In contrast, in rapid bone-forming conditions, woven bone was deposited as spicules extending from trabecular surface so as to form new networks on intertrabecular space. This causes obscurity of trabecular margins radiographically. Reactive endosteal bone formation may be nonspecific and have a significance for assessing the virulence of underlying pathologic conditions like periosteal reactions.

Aoki, Jun; Yamamoto, Itsuo; Hino, Megumu; Kitamura, Nobuyasu; Sone, Teruki; Itoh, Harumi; Torizuka, Kanji

1987-10-01

355

Unicameral bone cyst of a cervical vertebral body and lateral mass with associated pathological fracture in a child. Case report and review of the literature.  

Science.gov (United States)

The authors present the case of a 10-year-old girl with a history of cervical trauma in whom a cystic lesion was found to involve all three columns of C-7 with evidence of pathological fracture. Computerized tomography scanning revealed a lytic lesion with sclerotic margins involving the left vertebral body, pedicle, lateral mass, and lamina of C-7 with an associated pathological compression fracture. Magnetic resonance imaging demonstrated mixed signal on both T1- and T2-weighted sequences, with cystic and enhancing solid portions. Magnetic resonance angiography demonstrated anterior displacement of the left vertebral artery at C-7. The patient underwent C-7 subtotal corpectomy and posterior resection of the tumor mass; anterior and posterior fusion were performed in which instrumentation was placed. Histological examination disclosed cystic areas lined by fibromembranous tissue with calcification and osteoid deposits consistent with unicameral bone cyst. Of the four previously reported cases of unicameral bone cysts in the cervical spine, none involved all three columns simultaneously or was associated with pathological fracture. The most common differential diagnostic considerations for cystic lesions in the spine are aneurysmal bone cyst, osteoblastoma, or giant cell tumor of bone. Unicameral bone cyst, in this location, although rare, must be considered in the differential diagnosis and may require resection and spinal reconstruction. PMID:11599845

Snell, B E; Adesina, A; Wolfla, C E

2001-10-01

356

Aneurysmal bone cyst of temporal bone.  

Science.gov (United States)

Aneurysmal bone cysts (ABC) are benign neoplasms frequently occurring in the long tubular bones. It is very rare in temporal bone. We report a case of ABC of the left temporal bone in an 8-year-old Asian boy who presented clinically with swelling over the left temporal region for 5 months. CT and MRI features were suggestive of ABC. Surgical resection was performed and on follow-up the patient was doing well. CT and MRI are the imaging modalities for proper evaluation of ABC, aiding to diagnosis and helpful in treatment planning. PMID:24014580

Ansari, Sajid; Ahmad, Kaleem; Gupta, Mukesh Kumar; Rauniyar, Raj Kumar

2013-01-01

357

Growth and instability of the liquid rim in the crown splash regime  

CERN Document Server

We study the formation, growth, and disintegration of jets following impact of a drop on a thin film of the same liquid for We < 1000 and Re < 2000 using a combination of numerical simulations and linear stability theory (Agbaglah et al. 2013). Our simulations faithfully capture this phenomena and are in good agreement with experimental profiles obtained from high-speed X-ray imaging.We obtain scaling relations from our simulations and use these as inputs to our stability analysis. The resulting prediction for the most unstable wavelength are in excellent agreement with experimental data. Our calculations show that the dominant destabilizing mechanism is a competition between capillarity and inertia but that deceleration of the rim provides an additional boost to growth. We also predict over the entire parameter range of our study the number and timescale for formation of secondary droplets formed during a splash, based on the assumption that the most unstable mode sets the droplet number.

Agbaglah, G

2014-01-01

358

The insect-trapping rim of Nepenthes pitchers: surface structure and function.  

Science.gov (United States)

Carnivorous pitcher plants of the genus Nepenthes capture prey with a pitfall trap that relies on a micro-structured, slippery surface. The upper pitcher rim (peristome) is fully wettable and causes insects to slip by aquaplaning on a thin water film. The high wettability of the peristome is probably achieved by a combination of hydrophilic surface chemistry, surface roughness and the presence of hygroscopic nectar. Insect foot attachment could be prevented by the delayed drainage of the thin water film between the adhesive pad and the surface. Drainage should be faster for insects with a hairy adhesive system; however, they slip equally on the wet peristome. Therefore the stability of the water film against dewetting appears to be the key factor for aquaplaning. New experimental techniques may help to clarify the detailed function of the pitcher plant peristome and to explore its potential for biomimetic applications. PMID:20009546

Bauer, Ulrike; Federle, Walter

2009-11-01

359

Numerical Simulation of Stresses in Thin-rimmed Spur Gears with Keyway  

Directory of Open Access Journals (Sweden)

Full Text Available This paper contains an investigation of the key on a stress distribution in a thin-rimmed spur gear. A stress analysis was carried out by means of the Finite Element Method (FEM. The 2D-FE analysis has helped to find the influence of turning the gearing towards the keyway on the stress in the loaded root of the tooth and in the keyway. 2D and 3D numerical analysis has been used to find mutual influence of every single notch (root of tooth and keyway, influence of thickness of the hub, length of the key and the form of loading. Verification has been carried out through experimental method.

B. Br?žek

2003-01-01

360

Arthroscopic Removal of a Displaced Cannulated Screw after Glenoid Rim Fracture: A Case Report  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction: Internal fixation has been shown to successfully prevent recurrent dislocations after fractures of the glenoid rim. With regards to fixation either suture anchors or screws can be used, depending on the fragment size. Complications regarding suture anchors and their management have been described previously but not the arthroscopic management of screw impingement.Case Report: We present a case of a 70 year old women who suffered from limited range of motion after fixation of a Ideberg III fracture using cannulated screws. X-rays showed one of the screws to be proud. The proud screw could be successfully removed arthroscopically resulting in an improved range of motion, function and decreased pain.Conclusion: Our report describes a possible technique for performing a procedure arthroscopically that used to be done as an open procedure before and highlights it’s limitations.

Elias T. Berning

2013-01-01

 
 
 
 
361

Infrared observations of Barnard 35: Heat sources for bright-rimmed molecular clouds  

International Nuclear Information System (INIS)

We have conducted a deep 2 mm wavelength infrared survey of an extended region of enhanced 12CO emission in the bright-rimmed molecular cloud Barnard 35 in order to search for embedded heat sources. Twelve infrared sources were detected, all of which have been identified with visible, apparently foreground stars. Optical spectra were obtained for most of these sources, and we found them to be of relatively late spectral type (i.e., F8 and later). Two of the sources we detected are Ha emission-line, Orion population stars, one of which had been previously classified as Gea. However, we found no evidence for an embedded population of either early type (i.e., B and earlier) or intermediate type (F and earlier) stars in the cloud

362

Management of subtrochanteric femur fractures with internal fixation and recombinant human bone morphogenetic protein-7 in a patient with osteopetrosis: a case report  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Introduction Osteopetrosis is a group of conditions characterized by defects in the osteoclastic function of the bone resulting in defective bone resorption. Clinically, the condition is characterized by a dense, sclerotic, deformed bone which, despite an increased density observable by radiography, often results in an increased propensity to fracture and delayed union. Case Presentation We report the case of a 27-year-old Asian man presenting with bilateral subtrochanteric femur fractures. He had a displaced right subtrochanteric femur fracture after a low-energy fall, which was treated surgically. The second fracture that our patient endured was diagnosed as a stress fracture ten weeks later when he complained of pain in the contralateral left thigh. By that time, the right-sided fracture exhibited no radiographic evidence of healing, and when the left-sided stress fracture was being treated surgically, bone grafting with recombinant human bone morphogenetic protein-7 was also performed on the right side. Conclusion While there are no data supporting the use of bone morphogenic proteins in the management of delayed healing in patients with osteopetrosis, no other reliable osteoinductive grafting options are available to treat this condition. Both fractures in our patient healed, but based on the serial radiographic assessment it is uncertain to what degree the recombinant human bone morphogenetic protein-7 may have contributed to the successful outcome. It may have also contributed to the formation of heterotopic bone around the fracture site. Further investigation of the effectiveness and indications of bone morphogenic protein use for the management of delayed fracture healing in patients with osteopetrosis is warranted.

Golden Robert D

2010-05-01

363

Tumor primitivo neuroectodérmico de rim em criança Primitive neuroectodermal tumor of the kidney in children  

Directory of Open Access Journals (Sweden)

Full Text Available Objetivos: Caracterizar o tumor primitivo neuroectodérmico de rim como diagnóstico diferencial de tumor de Wilms e enfatizar a gravidade da doença. Métodos: Apresentamos um paciente com diagnóstico de tumor primitivo neuroectodérmico de rim, submetido a nefrectomia e ressecção completa do tumor, associadas a quimioterapia. Resultado: Inicialmente o paciente apresentou evolução favorável ao tratamento realizado, com poucas intercorrências, as quais eram relacionadas principalmente à agranulocitose decorrente da quimioterapia. Após dez meses do término da terapia o paciente apresentou recidiva tumoral em região cervical paramedular e abandonou o tratamento. Conclusão: O tumor primitivo neuroectodérmico de localização renal é muito raro e também muito grave. O papel do médico patologista é fundamental na caracterização da doença, pois utilizando de métodos histológicos e imunohistoquímicos, proporciona o diagnóstico definitivo.Objectives: To characterize primitive neuroectodermal tumor of the kidney as a differential diagnosis for Wilms tumor, and to emphasize the severity of the disease. Methods: We report the case of a patient with a diagnosis of primitive neuroectodermal tumor of the kidney who underwent nephrectomy and complete tumor resection combined with chemotherapy. Results: At the beginning, the patient had a favorable outcome, with few problems, especially related to the agranulocytosis. After ten months of the end of treatment the patient had a relapse at the paraspinal cervical region and abandoned the treatment. Conclusions: The primitive neuroectodermal tumor located in the kidney is very rare and also very aggressive. The role of the pathologist is fundamental for the characterization of the disease: using histological and immunohistochemical methods, he provides the final diagnosis.

Ana P. Kuczynski

2001-02-01

364

Tumor primitivo neuroectodérmico de rim em criança / Primitive neuroectodermal tumor of the kidney in children  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Objetivos: Caracterizar o tumor primitivo neuroectodérmico de rim como diagnóstico diferencial de tumor de Wilms e enfatizar a gravidade da doença. Métodos: Apresentamos um paciente com diagnóstico de tumor primitivo neuroectodérmico de rim, submetido a nefrectomia e ressecção completa do tumor, ass [...] ociadas a quimioterapia. Resultado: Inicialmente o paciente apresentou evolução favorável ao tratamento realizado, com poucas intercorrências, as quais eram relacionadas principalmente à agranulocitose decorrente da quimioterapia. Após dez meses do término da terapia o paciente apresentou recidiva tumoral em região cervical paramedular e abandonou o tratamento. Conclusão: O tumor primitivo neuroectodérmico de localização renal é muito raro e também muito grave. O papel do médico patologista é fundamental na caracterização da doença, pois utilizando de métodos histológicos e imunohistoquímicos, proporciona o diagnóstico definitivo. Abstract in english Objectives: To characterize primitive neuroectodermal tumor of the kidney as a differential diagnosis for Wilms tumor, and to emphasize the severity of the disease. Methods: We report the case of a patient with a diagnosis of primitive neuroectodermal tumor of the kidney who underwent nephrectomy an [...] d complete tumor resection combined with chemotherapy. Results: At the beginning, the patient had a favorable outcome, with few problems, especially related to the agranulocytosis. After ten months of the end of treatment the patient had a relapse at the paraspinal cervical region and abandoned the treatment. Conclusions: The primitive neuroectodermal tumor located in the kidney is very rare and also very aggressive. The role of the pathologist is fundamental for the characterization of the disease: using histological and immunohistochemical methods, he provides the final diagnosis.

Ana P., Kuczynski; Elizabeth S., Gugelmin; Rodrigo A.S., Netto.

2001-02-01

365

Nonthermal emission properties of the northwestern rim of supernova remnant RX J0852.0-4622  

Science.gov (United States)

The supernova remnant (SNR) RX J0852.0-4622 (Vela Jr., G266.6-1.2) is one of the most important SNRs for investigating the acceleration of multi-TeV particles and the origin of Galactic cosmic rays because of its strong synchrotron X-ray and TeV ?-ray emission, which show a shell-like morphology similar to each other. Using the XMM-Newton archival data consisting of multiple pointing observations of the northwestern rim of the remnant, we investigate the spatial properties of the nonthermal X-ray emission as a function of distance from an outer shock wave. All X-ray spectra are well reproduced by an absorbed power-law model above 2 keV. It is found that the spectra show gradual softening from a photon index ? = 2.56 in the rim region to ? = 2.96 in the interior region. We show that this radial profile can be interpreted as a gradual decrease of the cutoff energy of the electron spectrum due to synchrotron cooling. By using a simple spectral evolution model that includes continuous synchrotron losses, the spectral softening can be reproduced with the magnetic field strength in the post-shock flow to less than several tens of ?G. If this is a typical magnetic field in the SNR shell, ?-ray emission would be accounted for by inverse Compton scattering of high-energy electrons that also produce the synchrotron X-ray emission. Future hard X-ray imaging observations with Nustar and ASTRO-H and TeV ?-ray observations with the Cherenkov Telescope Array (CTA) will allow us to explore other possible explanations of the systematic softening of the X-ray spectra.

Kishishita, T.; Hiraga, J.; Uchiyama, Y.

2013-03-01

366

An upper mantle model for a western rim of the East European Craton  

Science.gov (United States)

The upper mantle structure is a subject of many seismological analysis but existent global models are often too general to depict regional variations. Our seismic model is a trial to construct a new reference model for the regional upper mantle structure in the western rim of the East European Craton. It is based on the P-wave traveltime analysis from seismograms recorded on Suwalki (SUW) seismic station belonging to the Polish Seismological Network. SUW station is situated in NE part of Poland on the East European Craton. The data from 249 natural seismic events were divided into four groups referring to the epicenters in the Western Mediterranean Sea region, Greece and Turkey region, Caucasus region and Mid-Atlantic Ridge region. Our analysis is based on the P-wave traveltimes observed up to 3000 km distance, which is sufficient to investigate upper mantle structure down to about 500 km. For each region, we established a single model which was fitted to all sections. 1D model was calculated for all regions except Jan Mayen region, for which we had to estimate 2D model because waves propagate through both oceanic and continental structure. However, the continental part of the Jan Mayen region model is similar to 1D model established for other regions. We also include data from TOR and SVEKALAPKO experiments to check the presence of the 300-km discontinuity. Our model of the upper mantle in the western rim of the East European Craton documents low velocity zone (LVZ), 300-km discontinuity and zone with the reduction of P-wave velocity above 410-km discontinuity. We attribute the existence of the 300-km discontinuity to the paleotectonic interaction between Laurentia, Baltica and Avalonia during the closure of the Tornquist Sea.

Dec, M.; Malinowski, M.; Nita, B.; Perchuc, E.

2012-04-01

367

RPPAML/RIMS: A metadata format and an information management system for reverse phase protein arrays  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Reverse Phase Protein Arrays (RPPA are convenient assay platforms to investigate the presence of biomarkers in tissue lysates. As with other high-throughput technologies, substantial amounts of analytical data are generated. Over 1000 samples may be printed on a single nitrocellulose slide. Up to 100 different proteins may be assessed using immunoperoxidase or immunoflorescence techniques in order to determine relative amounts of protein expression in the samples of interest. Results In this report an RPPA Information Management System (RIMS is described and made available with open source software. In order to implement the proposed system, we propose a metadata format known as reverse phase protein array markup language (RPPAML. RPPAML would enable researchers to describe, document and disseminate RPPA data. The complexity of the data structure needed to describe the results and the graphic tools necessary to visualize them require a software deployment distributed between a client and a server application. This was achieved without sacrificing interoperability between individual deployments through the use of an open source semantic database, S3DB. This data service backbone is available to multiple client side applications that can also access other server side deployments. The RIMS platform was designed to interoperate with other data analysis and data visualization tools such as Cytoscape. Conclusion The proposed RPPAML data format hopes to standardize RPPA data. Standardization of data would result in diverse client applications being able to operate on the same set of data. Additionally, having data in a standard format would enable data dissemination and data analysis.

Hennessy Bryan T

2008-12-01

368

X-ray Proper Motions and Shock Speeds along the Northwest Rim of SN1006  

Science.gov (United States)

We report the results of an X-ray proper motion measurement for the NW rim of SN 1006, carried out by comparing Chandra observations from 2001 and 2012. The NW limb has predominantly thermal X-ray emission, and it is the only location in SN 1006 with signi cant optical emission: a thin, Balmer-dominated lament. For most of the NW rim, the proper motion is approximately equal to 0.30"yr(exp -1), essentially the same as has been measured from the H alpha lament. Isolated regions of the NW limb are dominated by nonthermal emission, and here the proper motion is much higher, 0:49"yr(exp -1), close to the value measured in X-rays along the much brighter NE limb, where the X-rays are overwhelmingly nonthermal. At the 2.2 kpc distance to SN 1006, the proper motions imply shock velocities of approximately 3000 kms(exp -1) and approximately 5000 kms(exp -1) in the thermal and nonthermal regions, respectively. A lower velocity behind the H alpha filament is consistent with the picture that SN 1006 is encountering denser gas in the NW, as is also suggested by its overall morphology. In the thermally-dominated portion of the X-ray shell, we also see an o set in the radial profiles at different energies; the 0.5-0.6 keV peak dominated by O VII is closer to the shock front than that of the 0.8-3 keV emission|due to the longer times for heavier elements to reach ionization states where they produce strong X-ray emission.

Katsuda, Satoru; Long, Knox S.; Petre, Robert; Reynolds, Stephen P.; Williams, Brian J.; Winkler, P. Frank

2012-01-01

369

X-RAY PROPER MOTIONS AND SHOCK SPEEDS ALONG THE NORTHWEST RIM OF SN 1006  

International Nuclear Information System (INIS)

We report the results of an X-ray proper-motion measurement for the NW rim of SN 1006, carried out by comparing Chandra observations from 2001 to 2012. The NW limb has predominantly thermal X-ray emission, and it is the only location in SN 1006 with significant optical emission: a thin, Balmer-dominated filament. For most of the NW rim, the proper motion is ?0.''30 yr–1, essentially the same as has been measured from the H? filament. Isolated regions of the NW limb are dominated by nonthermal emission, and here the proper motion is much higher, 0.''49 yr–1, close to the value measured in X-rays along the much brighter NE limb, where the X-rays are overwhelmingly nonthermal. At the 2.2 kpc distance to SN 1006, the proper motions imply shock velocities of ?3000 km s–1 and ?5000 km s–1 in the thermal and nonthermal regions, respectively. A lower velocity behind the H? filament is consistent with the picture that SN 1006 is encountering denser gas in the NW, as is also suggested by its overall morphology. In the thermally dominated portion of the X-ray shell, we also see an offset in the radial profiles at different energies; the 0.5-0.6 keV peak dominated by O VII is closer to the shock front than that of the 0.8-3 keV emission—due to the longer times for heavier elements to reach ionization states where they produce strong X-ray emission.

370

RPPAML/RIMS: A metadata format and an information management system for reverse phase protein arrays  

Science.gov (United States)

Background Reverse Phase Protein Arrays (RPPA) are convenient assay platforms to investigate the presence of biomarkers in tissue lysates. As with other high-throughput technologies, substantial amounts of analytical data are generated. Over 1000 samples may be printed on a single nitrocellulose slide. Up to 100 different proteins may be assessed using immunoperoxidase or immunoflorescence techniques in order to determine relative amounts of protein expression in the samples of interest. Results In this report an RPPA Information Management System (RIMS) is described and made available with open source software. In order to implement the proposed system, we propose a metadata format known as reverse phase protein array markup language (RPPAML). RPPAML would enable researchers to describe, document and disseminate RPPA data. The complexity of the data structure needed to describe the results and the graphic tools necessary to visualize them require a software deployment distributed between a client and a server application. This was achieved without sacrificing interoperability between individual deployments through the use of an open source semantic database, S3DB. This data service backbone is available to multiple client side applications that can also access other server side deployments. The RIMS platform was designed to interoperate with other data analysis and data visualization tools such as Cytoscape. Conclusion The proposed RPPAML data format hopes to standardize RPPA data. Standardization of data would result in diverse client applications being able to operate on the same set of data. Additionally, having data in a standard format would enable data dissemination and data analysis. PMID:19102773

Stanislaus, Romesh; Carey, Mark; Deus, Helena F; Coombes, Kevin; Hennessy, Bryan T; Mills, Gordon B; Almeida, Jonas S

2008-01-01

371

Roentgenological semiotics of bone and bone joints pathology  

International Nuclear Information System (INIS)

Physiologic and pathologic processes in bones followed by alternations of bone structure and reflected on roentgenograms are considered and described. Most frequent reasons for roentgenodiagnosis errors in diseases of bone and bone joint apparatus are presented

372

Radionuclide bone scan  

International Nuclear Information System (INIS)

Recently, the clinical use of radionuclide bone scan has been populized for the detection of bone lesions. For the sensitivity rate of this modality is superior to that of the radiography in the reflexion of local bone pathology. Especially, bone scanning offers reliable means for establishing the early detection, determining the extent of the disease and assessing the therapeutic response in bone tumor, infection and trauma. A comparative study of bone scans to radiographies with 45 proven cases of bone tumors, inflammations and fractures was tried at Department of Radiology, Chung Ang university hospital, during January 1980 to October 1980. Results were as follows: 1. Increased radioactivities were seen in all primary malignant bone tumors, but exostosis and bone cyst were showed negative finding in bone scans. 2. No evidence of increases uptake was noted in one case of destructive metastatic lesion without osteoblastic reaction. 3. Inflammations of skeletal system were detected by bone scan at early time than by orthodox radiography. It was difficult to differentiate osteomyelitis from other inflammatory disease, such as cellulitis or septic arthritis, by bone scan only. 4. Fresh fractures were identified as increased radioactivity, but healed fractures were negative in bone scans. Prolongation of increased uptake

373

Radionuclide bone scan  

Energy Technology Data Exchange (ETDEWEB)

Recently, the clinical use of radionuclide bone scan has been popularized for the detection of bone lesions. For the sensitivity rate of this modality is superior to that of the radiography in the reflexion of local bone pathology. Especially, bone scanning offers reliable means for establishing the early detection, determining the extent of the disease and assessing the therapeutic response in bone tumor, infection and trauma. A comparative study of bone scans to radiographies with 45 proven cases of bone tumors, inflammations and fractures was tried at Department of Radiology, Chung Ang university hospital, during January 1980 to October 1980. Results were as follows: 1. Increased radioactivities were seen in all primary malignant bone tumors, but exostosis and bone cyst were showed negative finding in bone scans. 2. No evidence of increased uptake was noted in one case of destructive metastatic lesion without osteoblastic reaction. 3. Inflammations of skeletal system were detected by bone scan at an earlier time than by orthodox radiography. It was difficult to differentiate osteomyelitis from other inflammatory disease, such as cellulitis or septic arthritis, by bone scan only. 4. Fresh fractures were identified as increased radioactivity, but healed fractures were negative in bone scans. Prolongation increased uptake.

Park, J.H.; Lee, Y.C.; Lee, K.S.; Kim, K.S.; Park, S.S. (Chungang Univ., Seoul (Republic of Korea))

1982-03-01

374

[Bone metabolic markers for evaluation of bone metastases].  

Science.gov (United States)

Bone metabolic markers consist of bone formation markers, which are secreted from osteoblasts (BAP, OC, P1CP, P1NP) , and bone resorption markers, which are metabolites of bone type 1 collagen or secreted from osteoclasts (PYD, DPD, NTX, CTX, 1CTP, TRACP) . Those bone metabolic markers are useful for : (1) diagnosis of bone metastases, (2) follow-up during treatment of bone metastases, and (3)predicting prognosis of bone metastases. PMID:23445893

Takahashi, Shunji

2013-03-01

375

Low Bone Mass in Thalassemia  

Science.gov (United States)

Why is low bone mass an issue in thalassemia? Having bones that grow and develop into strong, healthy bones is important ... these supplements. What can be done to treat low bone mass? Following all of the above prevention ...

376

Bone marrow imaging  

International Nuclear Information System (INIS)

Bone marrow imaging is of limited value in most patients with hematologic disorders. Frequently marrow aspirate or biopsy can reveal detailed information for accurate diagnosis. However in patients with nonuniform marrow distribution bone marrow imaging may be of considerable help in localizing the diseased sites for marrow sampling. Marrow scintigraphy in conjunction with bone imaging has been used in the evaluation of bone and joint complaints in patients with sickle cell disorders. Marrow scanning with Fe-52 has been utilized in the investigation of mass lesions that may represent extramedullary hematopoiesis. Bone marrow imaging is of limited value in the metastatic workup of patients with malignancy. This paper discusses how bone marrow scanning is useful in evaluating the distribution of active marrow in various hematologic disorders. It is also useful in evaluation of the complications of these disorders. It may be used, in conjunction with bone imaging, to aid in the differential diagnosis of bone pain in patients with predisposition to marrow infarction

377

Broken Bones (For Parents)  

Science.gov (United States)

... will remove the pin. When Will a Broken Bone Heal? Fractures heal at different rates, depending upon ... doctor says it's OK. Back Continue Preventing Broken Bones Although fractures are a common part of childhood, ...

378

Smoking and Bone Health  

Science.gov (United States)

... supported by your browser. Home Bone Basics Lifestyle Smoking and Bone Health Publication available in: PDF (217 ... Overtraining Risks for Women Oral Health Partner Resources Smoking: It’s Never Too Late to Stop (NIA)

379

Skeletal Scintigraphy (Bone Scan)  

Science.gov (United States)

... abnormalities that may be missed in a Bone Radiography or X-ray (http://www.radiologyinfo.org/en/ ... radiopharmaceuticals can be transmitted to the baby through breast milk. top of page • Limitations Bone scans cannot ...

380

Autoinflammatory bone disorders.  

Science.gov (United States)

Autoinflammatory bone disorders are characterized by chronic non-infectious osteomyelitis and inflammation-induced bone resorption and result from aberrant activation of the innate immune system. Sporadic chronic non-bacterial osteomyelitis (CNO) is the most common disease subtype. The clinical picture is highly variable and the exact underlying pathophysiology remains to be determined. Recently, novel insights in the pathophysiology of sterile bone inflammation have been gathered by analyzing patients with rare, monogenic inflammatory diseases. In this overview CNO and Majeed syndrome, cherubism, hypophosphatasia and primary hypertrophic osteoarthropathy will be discussed. For the latter four disorders, a genetic cause affecting bone metabolism and leading to chronic bone inflammation has been described. The exact pathophysiology of CNO remains to be determined. Insights from monogenic autoinflammatory bone diseases and the identification of distinct inflammatory pathways may help to understand the pathogenesis of bone inflammation and inflammation-induced bone resorption in more common diseases. PMID:23369460

Morbach, Henner; Hedrich, Christian M; Beer, Meinrad; Girschick, Hermann J

2013-06-01

 
 
 
 
381

Bone mineral density test  

Science.gov (United States)

BMD test; Bone density test; Bone densitometry; DEXA scan; DXA; Dual-energy x-ray absorptiometry; p-DEXA; Osteoporosis-BMD ... need to undress. This scan is the best test to predict your risk of fractures. Peripheral DEXA ( ...

382

Photon absorptiometry of bone and bone standards  

International Nuclear Information System (INIS)

Measured and parametrised values of the attenuation coefficients of bone and several bone standards are presented for the photon energies 33, 75, 145, 279 and 662 keV. The values are compared, inadequacies are highlighted and possible new formulations are discussed. (author)

383

Myocardial first-pass perfusion: influence of spatial resolution and heart rate on the dark rim artifact.  

Science.gov (United States)

Myocardial perfusion images can be affected by the dark rim artifact. This study aimed to evaluate the effects of the spatial resolution and heart rate on the transmural extent of the artifact. Six pigs under anesthesia were scanned at 1.5T using an echo-planar imaging/fast gradient echo sequence with a nonselective saturation preparation pulse. Three short-axis slices were acquired every heart beat during the first pass of a contrast agent bolus. Two different in-plane spatial resolutions (2.65 and 3.75 mm) and two different heart rates (normal and tachycardia) were used, generating a set of four perfusion scans. The percentage drop of signal in the subendocardium compared to the epicardium and the transmural extent of the artifact were extracted. Additionally, the signal-to-noise and the contrast-to-noise ratios were evaluated. The signal drop as well as the width of the dark rim artifact increased with decreased spatial resolution and with increased heart rates. No significant slice-to-slice variability was detected for signal drop and width of the rim within the four considered groups. signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) ratios decreased with increasing spatial resolution. In conclusion, low spatial and temporal resolution could be correlated with increased extent of the dark-rim artifact and with lower SNR and CNR. PMID:21702061

Meloni, Antonella; Al-Saadi, Nidal; Torheim, Geir; Hoebel, Nadja; Reynolds, H Glenn; De Marchi, Daniele; Positano, Vincenzo; Burchielli, Silvia; Lombardi, Massimo

2011-12-01

384

TOR and PKA signaling pathways converge on the protein kinase Rim15 to control entry into G0.  

Science.gov (United States)

The highly conserved Tor kinases (TOR) and the protein kinase A (PKA) pathway regulate cell proliferation in response to growth factors and/or nutrients. In Saccharomyces cerevisiae, loss of either TOR or PKA causes cells to arrest growth early in G(1) and to enter G(0) by mechanisms that are poorly understood. Here we demonstrate that the protein kinase Rim15 is required for entry into G(0) following inactivation of TOR and/or PKA. Induction of Rim15-dependent G(0) traits requires two discrete processes, i.e., nuclear accumulation of Rim15, which is negatively regulated both by a Sit4-independent TOR effector branch and the protein kinase B (PKB/Akt) homolog Sch9, and release from PKA-mediated inhibition of its protein kinase activity. Thus, Rim15 integrates signals from at least three nutrient-sensory kinases (TOR, PKA, and Sch9) to properly control entry into G(0), a key developmental process in eukaryotic cells. PMID:14690612

Pedruzzi, Ivo; Dubouloz, Frédérique; Cameroni, Elisabetta; Wanke, Valeria; Roosen, Johnny; Winderickx, Joris; De Virgilio, Claudio

2003-12-01

385

49 CFR 571.110 - Tire selection and rims and motor home/recreation vehicle trailer load carrying capacity...  

Science.gov (United States)

...or tire and rim assemblies, or minor finishing...in the English language, lettered in...controlled braking application. Table I...Non-Pneumatic Spare Tire Assemblies S7.1Vehicle...non-pneumatic spare tire assembly, shall display the...in the English language and in not less...

2010-10-01

386

49 CFR 571.120 - Tire selection and rims and motor home/recreation vehicle trailer load carrying capacity...  

Science.gov (United States)

...place of manufacture of the vehicle with retreaded or used tires...also appear on each other part of the rim. (a) A designation...complies with all applicable motor vehicle safety standards. (d...the interrelationship of the component parts of the symbol as...

2010-10-01

387

RIMS (real-time imprint monitoring by scattering of light) study of pressure, temperature and resist effects on nanoimprint lithography  

Energy Technology Data Exchange (ETDEWEB)

To optimize nanoimprint lithography (NIL), it is essential to be able to characterize and control the NIL process in situ and in real time. Recently we have developed a real-time imprint monitoring by the scattering-of-light (RIMS) approach, which allows us to detect the degree of resist deformation and the duration of resist penetration by a mould during the imprint process in real time. In this paper we report the performances of RIMS under a broad range of working conditions. RIMS data shows that the resist penetration is facilitated by increasing processing temperature, pressure and the resist film thickness; a prolonged pre-NIL resist baking step, on the other hand, has the effect of slowing it down. Our results provide further demonstration of the effectiveness of this method under different working conditions. RIMS measurements show not only how long an imprint takes to complete, but also how an imprint progresses with time and how it is affected by differences in processing parameters. These measurements provide information crucial for a better understanding and process optimization in NIL.

Yu Zhaoning; Gao He; Chou, Stephen Y [NanoStructure Laboratory, Department of Electrical Engineering, Princeton University, Princeton, NJ 08544 (United States)

2007-02-14

388

49 CFR 571.110 - Tire selection and rims and motor home/recreation vehicle trailer load carrying capacity...  

Science.gov (United States)

...mirrors or tire and rim assemblies, or minor finishing...shall be in the English language, lettered in block...Non-Pneumatic Spare Tire Assemblies S7.1Vehicle Placarding...non-pneumatic spare tire assembly, shall display the information...writing in the English language and in not less than 10...

2010-10-01

389

Spatially Resolved XRF, XRD and Fe-XANES Analysis of Fine-Grained Rims in the Murchison (CM2) Meteorite  

Science.gov (United States)

Fe3+/?Fe ratios suggest that hydration of fine-grained rims and matrix in the Murchison meteorite occurred in a similar environment. However, local variations in mineralogy and crystal chemistry indicate that the alteration varied at the ?m-scale.

King, A. J.; Schofield, P. F.; Mosselmans, J. F. W.; Russell, S. S.

2014-09-01

390

Apparatus for efficient sidewall containment of molten metal with horizontal alternating magnetic fields utilizing low reluctance rims  

Science.gov (United States)

A method and apparatus for casting sheets of metal from molten metal. The apparatus includes a containment structure having an open side, a horizontal alternating magnetic field generating structure and rollers including low reluctance rim structures. The magnetic field and the rollers help contain the molten metal from leaking out of the containment structure.

Praeg, Walter F. (Palos Park, IL)

1999-01-01

391

Heterogenous Oxygen Isotopic Composition of a Complex Wark-Lovering Rim and the Margin of a Refractory Inclusion from Leoville  

Science.gov (United States)

Wark-Lovering (WL) rims [1] surrounding many refractory inclusions represent marker events in the early evolution of the Solar System in which many inclusions were exposed to changes in pressure [2], temperature [3], and isotopic reservoirs [4-7]. The effects of these events can be complex, not only producing mineralogical variability of WL rims [2], but also leading to mineralogical [8-10] and isotopic [7, 11, 12] changes within inclusion interiors. Extreme oxygen isotopic heterogeneity measured in CAIs has been explained by mixing between distinct oxygen gas reservoirs in the nebula [13]. Some WL rims contain relatively simple mineral layering and/or are isotopically homogeneous [14, 15]. As part of a larger effort to document and understand the modifications observed in some CAIs, an inclusion (L6) with a complex WL rim from Leoville, a member of the reduced CV3 subgroup was studied. Initial study of the textures and mineral chemistry was presented by [16]. Here we present NanoSIMS oxygen isotopic measurements to complement these petrologic observations.

Simon, J. I.; Matzel, J. E. P.; Simon, S. B.; Weber, P. K.; Grossman, L.; Ross, D. K.; Hutcheon, I. D.

2014-01-01

392

Isotopic distribution from core to rim of a PWR spent nuclear fuel by shielded laser ablation ICP MS  

International Nuclear Information System (INIS)

Spent nuclear fuel discharged from a pressurized light water reactor contains fission products, U, Pu, and other actinides. Due to a neutron capture by 238U in the rim region and a temperature gradient between the center and the rim of a fuel pellet, a considerable increase in the concentration of fission products, U, Pu, and other actinides are expected at a pellet periphery. Characterization of the local chemical properties with a varying radial gradient is our main concern. For an analysis, a spent nuclear fuel originating from the Yeonggwang 4 PWR reactor with an average burn up of 55,600 MWd/MtU was chosen as a test specimen. The isotopic ratio was measured from core to rim of the spent fuel by a radiation shielded LA ICP MS system. Sampling was performed along the diameter of a sample specimen by reducing the intervals from 500?m to 100?m. It was observed that the isotopic ratios in the center of a sample specimen remain almost constant and increased near the pellet periphery due to the rim effect. In addition, the isotopic distribution measured by the radiation shielded LA ICP MS was compared with that of the calculated value by the Origin2 code

393

Regeneration of Mastoid Air Cells in Vivo Using Autologous Cortical Bone  

Directory of Open Access Journals (Sweden)

Full Text Available Purpose: This was a preliminary study to assess surgical construction and regeneration of mastoid air cells in the treatment of cholesteatoma. Methods: Two-stage tympanoplasty with mastoidectomy was performed in four cases of unilateral cholesteatoma with sclerotic mastoid. During the first-stage operation, small fragments of autologous cortical bone were inserted into the cavity after mastoidectomy to form a honeycomb-like structure. Reconstruction of the lateral wall of the mastoid cavity was performed using the mastoid cortical bony plate. Pre- and postoperative mastoid volume was evaluated by three-dimensional reconstruction based on high-resolution computed tomography (HR-CT images. Results: HR-CT images after the first-stage operation showed that mastoid volume had increased in all subjects. Macroscopic inspection during the second-stage operation revealed that the honeycomb-like structure made of bony fragments and covered by thin mucosa in the mastoid cavity was stable, with no evidence of effusion or granulation tissue. No retraction of the eardrum, middle ear effusion or recurrence of cholesteatoma was observed, and the hearing level on a pure-tone audiogram was improved in any subject 60 - 94 months after the second-stage operation. Conclusion: Surgical construction and regeneration of mastoid air cells using autologous cortical bone can be useful in treatment of cholesteatoma with arrested mastoid pneumatization.

Ken-ichi Kaneko

2012-11-01

394

Saccular function in otosclerosis patients: bone conducted-vestibular evoked myogenic potential analysis.  

Science.gov (United States)

Vestibular involvements have long been observed in otosclerotic patients. Among vestibular structures saccule has the closest anatomical proximity to the sclerotic foci, so it is the most prone vestibular structure to be affected during the otosclerosis process. The aim of this study was to investigate the saccular function in patients suffering from otosclerosis, by means of Vestibular Evoked Myogenic Potential (VEMP). The material consisted of 30 otosclerosis patients and 20 control subjects. All participants underwent audiometric and VEMP testing. Analysis of tests results revealed that the mean values of Air-Conducted Pure Tone Average (AC-PTA) and Bone-Conducted Pure Tone Average (BC-PTA) in patients were 45.28 ± 15.57 and 19.68 ± 10.91, respectively and calculated 4 frequencies Air Bone Gap (ABG) was 25.64 ± 9.95. The VEMP response was absent in 14 (28.57%) otosclerotic ears. A statistically significant increase in latency of the p13 was found in the affected ears (P=0.004), differences in n23 latency did not reach a statistically significant level (P=0.112). Disparities in amplitude of p13-n23 in between two study groups was statistically meaningful (P=0.009), indicating that the patients with otosclerosis had lower amplitudes. This study tends to suggest that due to the direct biotoxic effect of the materials released from the otosclerosis foci on saccular receptors, there might be a possibility of vestibular dysfunction in otosclerotic patients. PMID:24659067

Amali, Amin; Mahdi, Parvane; Karimi Yazdi, Alireza; Khorsandi Ashtiyani, Mohammad Taghi; Yazdani, Nasrin; Vakili, Varasteh; Pourbakht, Akram

2014-01-01

395

Monofunctionalization of Calix[4]arene Tetracarboxylic Acid at the Upper Rim with Isothiocyanate Group: First Bifunctional Chelating Agent for Alpha-Emitter Ac-225  

Digital Repository Infrastructure Vision for European Research (DRIVER)

A procedure is reported for synthesizing a novel, water-soluble bifunctional chelating agent derived from calix[4]arene. This chelate features tetracarboxylic acid groups at the lower rim as an actinium-225 ionophore, and an isothiocyanate functional group at the upper rim for labeling of the N-terminus of monoclonal antibodies through thiourea linkage.

Chen, Xiaoyuan; Ji, Min; Fisher, Darrell R.; Wai, Chien M.

1999-01-01

396

Thermal and fluid processes of a thin melt zone during femtosecond laser ablation of glass: the formation of rims by single laser pulses  

Energy Technology Data Exchange (ETDEWEB)

We study the formation mechanism of rims created around femtosecond laser ablated craters on glass. Experimental studies of the surface morphology reveal that a thin rim is formed around the smooth craters and is raised above the undamaged surface by about 50-100 nm. To investigate the mechanism of rim formation following a single ultrafast laser pulse, we perform a one-dimensional theoretical analysis of the thermal and fluid processes involved in the ablation process. The results indicate the existence of a very thin melted zone below the surface and suggest that the rim is formed by the high pressure plasma producing a pressure-driven fluid motion of the molten material outwards from the centre of the crater. The numerical solutions of pressure-driven fluid motion of the thin melt demonstrate that the melt can flow to the crater edge and form a rim within the first nanoseconds of the ablation process. The possibility that a tall rim can be formed during the initial stages of the plasma is suggestive that the rim may tilt outwards towards the low pressure region creating a resolidified melt splash as observed in the experiments. The possibility of controlling or suppressing the rim formation is discussed also.

Ben-Yakar, Adela [Mechanical Engineering Department, University of Texas at Austin, Austin, TX 78712 (United States); Harkin, Anthony [School of Mathematical Sciences, Rochester Institute of Technology, Rochester, NY 14623 (United States); Ashmore, Jacqueline [Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138 (United States); Byer, Robert L [Applied Physics Department, Ginzton Lab, Stanford University, CA 94305 (United States); Stone, Howard A [Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138 (United States)

2007-03-07

397

Thermal and fluid processes of a thin melt zone during femtosecond laser ablation of glass: the formation of rims by single laser pulses  

International Nuclear Information System (INIS)

We study the formation mechanism of rims created around femtosecond laser ablated craters on glass. Experimental studies of the surface morphology reveal that a thin rim is formed around the smooth craters and is raised above the undamaged surface by about 50-100 nm. To investigate the mechanism of rim formation following a single ultrafast laser pulse, we perform a one-dimensional theoretical analysis of the thermal and fluid processes involved in the ablation process. The results indicate the existence of a very thin melted zone below the surface and suggest that the rim is formed by the high pressure plasma producing a pressure-driven fluid motion of the molten material outwards from the centre of the crater. The numerical solutions of pressure-driven fluid motion of the thin melt demonstrate that the melt can flow to the crater edge and form a rim within the first nanoseconds of the ablation process. The possibility that a tall rim can be formed during the initial stages of the plasma is suggestive that the rim may tilt outwards towards the low pressure region creating a resolidified melt splash as observed in the experiments. The possibility of controlling or suppressing the rim formation is discussed also

398

16 CFR Table 3 to Part 1512 - Minimum Acceptable Values for the Quantity A Defined in the Retroreflective Tire and Rim Test...  

Science.gov (United States)

...Values for the Quantity A Defined in the Retroreflective Tire and Rim Test Procedure 3 Table 3 to Part 1512 Commercial Practices...Values for the Quantity A Defined in the Retroreflective Tire and Rim Test Procedure Observation angle (degrees) Entrance...

2010-01-01

399

Petrographic Studies of Fine-grained Rims in the Yamato 791198 cm Carbonaceous Chondrite and Comparison to Murchison and ALH81002  

Science.gov (United States)

Fine-grained rims in Y791198 (CM2) have been studied in detail using SEM and EPMA techniques. In comparison with the more highly altered CM chondrite, ALH 81002, the rims are texturally and compositionally more heterogeneous. Additional information is contained in the original extended abstract.

Chizmadia, L. J.; Brearley, A. J.

2001-01-01

400

Aneurysmal bone cyst of the frontal bone  

Directory of Open Access Journals (Sweden)

Full Text Available Background. Aneurysmal bone cyst (ABC is a benign, expansive, osteolytic lesion that mainly occurs in young people, and involves the skull bones only exceptionally. The origin of ABC is controversial: secondary reactive bone lesion, or primary disease that represents an independent nosological entity. Blunt head trauma was suggested as a possible etiological factor. Case report. A case of a 19-year old man with primary ABC of the right frontal bone was reported. The lesion was totally excised through frontal craniotomy, and the skull bone defect primarily reconstructed with an acrilate cranioplasty. Five years after the surgery, the patient was without signs of local recurrence. Conclusion. Clinical and neuroradiological presentation of the skull ABC was not specific. Pathohistology confirmed the diagnosis. Total excision was the treatment of choice.

Peri? Predrag

2005-01-01