bluuebunny/crossref_metadata_2025_split huggingface dataset:
Rotary Gas Separators in High GOR Wells, Field and Lab Tests Comparison
Authors: Drozdov A. N. , Verbitckiy V. S. , Dengaev A. V. , Arseniev A. A. , Litvinenko V. A. , Khabibullin R. A. , Litvinenko K. V. , Elichev V. A. 
Published: October 2008

Abstract
Monitoring and testing of subsurface equipment is crucial when stepping up artificial lift efficiency. Oil production using electrical submersible pumps (ESP) in RN-Purneftegas was initially complicated by a strong gas influence. The main method to increase ESP performance in wells with a high GOR is using rotary gas separators. Subsurface equipment adjustment for high GOR conditions, including gas separator calibration, is of primary importance, due to a strong influence of the ESP design on well performance.
To perform the corresponding calculations, appropriate data is necessary. Currently, there are many tools and measurement devices for oil production monitoring and controlling, however, it is impossible to use its data without a good understanding of all the parts of the "reservoir-well-pump" production chain. The artificial lift team formed under Rosneft's New Technology System program conducted a wide range of field tests. The main goal of such tests was gathering information for parameter analysis and proper timing of ESPs with malfunctions in rotary gas separators. The collected information about real field performance was then used for validation of the accuracy of the lab data for gas separator performance, acquired by Russian State Oil&Gas University. It was concluded that the gas separator performance data obtained in laboratory if combined with correlation for natural separation prediction can be used for total separation efficiency estimation. The test results allowed us to estimate the potential for oil production increase at over 700 tons per day in Purneftegas.
Retrieving Vuggy-Fractured Porosity from Standard Well Log Data
Authors: Nadezhdin Oleg , Borisov Gleb , Savichev Vladimair 
Published: October 2008

Abstract
While FMI-logged wells are quite scarce at the field under investigation, the standard log complex is normally present in all the wells. This paper tackles the task of retrieving vuggy-fractured porosity using standard log data with the end of further transferring the synthetic vuggy-fractured porosity (VFP) data across all the field's wells having standard log data.
A consensus map of chromosome 6R in rye (Secale cereale L.)
Authors: Stojałowski Stefan , Myśków Beata , Milczarski Paweł , Masojć Piotr 
Published: October 2008

AbstractFour F2 mapping populations derived from crosses between rye inbred lines DS2×RXL10, 541×Ot1-3, S120×S76 and 544×Ot0-20 were used to develop a consensus map of chromosome 6R. Thirteen marker loci that were polymorphic in more than one mapping population constituted the basis for the alignment of the four maps using the JoinMap v. 3.0 software package. The consensus map consists of 104 molecular marker loci including RFLPs, RAPDs, AFLPs, SSRs, ISSRs, SCARs, STSs and isozymes. The average distance between the marker loci is 1.3 cM, and the total map length is 135.5 cM. This consensus map may be used as a source of molecular markers for the rapid development of new maps of chromosome 6R in any mapping population.
The ceramide structure of GM1 ganglioside differently affects its recovery in low-density membrane fractions prepared from HL-60 cells with or without triton-X100
Authors: Panasiewicz Mirosława , Domek Hanna , Hoser Grażyna , Fedoryszak Natalia , Kawalec Maciej , Pacuszka Tadeusz 
Published: October 2008

AbstractGangliosides are characteristically enriched in various membrane domains that can be isolated as low density membrane fraction insoluble in detergents (detergent-resistant membranes, DRMs) or obtained after homogenization and sonication in 0.5 M sodium carbonate (low-density membranes, LDMs). We assessed the effect of the ceramide structure of four [3H]-labeled GM1 ganglioside molecular species (GM1s) taken up by HL-60 cells on their occurrence in LDMs, and compared it with our previous observations for DRMs. All GM1s contained C18 sphingosine, which was acetylated in GM1(18:1/2) or acylated with C14, C18 or C18:1 fatty acids (Fas)
Prognostic factors in the persistence of posttraumatic epilepsy after penetrating head injuries sustained in war
Authors: Eftekhar Behzad , Sahraian Mohammad Ali , Nouralishahi Banafsheh , Khaji Ali , Vahabi Zahra , Ghodsi Mohammad , Araghizadeh Hassan , Soroush Mohammad Reza , Esmaeili Sima Karbalaei , Masoumi Mehdi 
Published: October 2008

Object
The goal of this paper was to investigate the long-term outcome and the possible prognostic factors that might have influenced the persistence of posttraumatic epilepsy after penetrating head injuries sustained during the Iraq–Iran war (1980–1988).

Methods
In this retrospective study, the authors evaluated 189 patients who sustained penetrating head injury and suffered posttraumatic epilepsy during the Iraq–Iran war (mean 18.6 ± 4.7 years after injury). The probabilities of persistent seizures (seizure occurrence in the past 2 years) in different periods after injury were estimated using the Kaplan-Meier method. The possible prognostic factors (patients and injury characteristics, clinical findings, and seizure characteristics) were studied using log-rank and Cox regression analysis.

Results
The probability of persistent seizures was 86.4% after 16 years and 74.7% after 21 years. In patients with < 3 pieces of shrapnel or no sphincter disturbances during seizure attacks, the probability of being seizure free after these 16 and 21 years was significantly higher.

Conclusions
Early seizures, prophylactic antiepileptics drugs, and surgical intervention did not significantly affect long-term outcome in regard to persistence of seizures.
Treatment of intracranial aneurysms with the Enterprise stent: a multicenter registry
Authors: Mocco J , Snyder Kenneth V. , Albuquerque Felipe C. , Bendok Bernard R. , Boulos Alan S. , Carpenter Jeffrey S. , Fiorella David J. , Hoh Brian L. , Howington Jay U. , Jankowitz Brian T. , Liebma N Kenneth M. , Rai Ansaar T. , Rodriguez-Mercado Rafael , Siddiqui Adnan H. , Veznedaroglu Erol , Hopkins L. Nelson , Levy Elad I. 
Published: October 2008

Object
The development of self-expanding stents dedicated to intracranial use has significantly widened the applicability of endovascular therapy to many intracranial aneurysms that would otherwise have been untreatable by endovascular techniques. Recent Food and Drug Administration approval of the Enterprise Vascular Reconstruction Device and Delivery System (Cordis) has added a new option for self-expanding stent-assisted intracranial aneurysm coiling.

Methods
The authors established a collaborative registry across multiple institutions to rapidly provide largevolume results regarding initial experience in using the Enterprise in real-world practice. Ten institutions (University at Buffalo, Thomas Jefferson University, University of Florida, Cleveland Clinic, Northwestern University, West Virginia University, University of Puerto Rico, Albany Medical Center Hospital, the Neurological Institute of Savannah, and the Barrow Neurological Institute) have provided consecutive data regarding their initial experience with the Enterprise.

Results
In total, 141 patients (119 women) with 142 aneurysms underwent 143 attempted stent deployments. The use of Enterprise assistance with aneurysm coiling was associated with a 76% rate of ≥ 90% occlusion. An inability to navigate or deploy the stent was experienced in 3% of cases, as well as a 2% occurrence of inaccurate deployment. Procedural data demonstrated a 6% temporary morbidity, 2.8% permanent morbidity, and 2% mortality (0.8% unruptured, 12% ruptured).

Conclusions
The authors report initial results of the largest series to date in using the Enterprise for intracranial aneurysm treatment. The Enterprise is associated with a high rate of successful navigation and low occurrence of inaccurate stent deployment. The overall morbidity and mortality rates were low; however, caution should be exercised when considering Enterprise deployment in patients with subarachnoid hemorrhage as the authors' experience demonstrated a high rate of associated hemorrhagic complications leading to death.
Maffucci syndrome associated with a pituitary adenoma and a probable brainstem tumor
Authors: Ruivo Joana , Antunes João Lobo 
Published: October 2008

Malignancies are a common feature of Maffucci syndrome, with chondrosarcomas being the most common tumor type. The authors present the first case of Maffucci syndrome associated with a pituitary adenoma and a probable brainstem glioma and review the literature concerning intracranial tumors related to this disease.
They report the case of a 35-year-old woman with Marfucci syndrome (diagnosed when she was 22 years old) who presented with complaints of decreased visual acuity and visual field defect. Neuroimaging revealed a pituitary macroadenoma and a suspected brainstem tumor. The macroadenoma was partially removed. There were no postoperative complications and the patient experienced rapid improvement in visual acuity. On follow-up examination 2 years later, the lesion in the pons showed the same dimensions. No sarcomatous changes of enchondromas or hemangiomas occurred.
To the authors' knowledge, including the present case, only 7 cases of Maffucci syndrome associated with glioma and 7 cases associated with pituitary adenoma have been reported in the literature. This report emphasizes that patients with this disease are at a higher risk for primary intracranial tumors and reinforces the concept of the multiplicity of tumors that may arise in this syndrome. It also underscores the importance of early diagnosis, regular clinical surveillance, and follow-up studies of these patients.
Gamma Knife radiosurgery for skull base meningioma: long-term results of low-dose treatment
Authors: Iwai Yoshiyasu , Yamanaka Kazuhiro , Ikeda Hidetoshi 
Published: October 2008

Object
In this study, the authors evaluate the long-term results after Gamma Knife radiosurgery of cranial base meningiomas. This study is a follow-up to their previously published report on the early results.

Methods
Between January 1994 and December 2001, the authors treated benign cranial base meningiomas in 108 patients using low-dose Gamma Knife radiosurgery. The tumor volumes ranged from 1.7 to 55.3 cm3 (median 8.1 cm3), and the radiosurgery doses ranged from 8 to 12 Gy (median 12 Gy) to the tumor margin.

Results
The mean duration of follow-up was 86.1 months (range 20–144 months). Tumor volume decreased in 50 patients (46%), remained stable in 51 patients (47%), and increased (local failure) in 7 patients (6%). Eleven patients experienced tumor recurrence outside the treatment field. Among these patients, marginal failure was seen in 5 and distant recurrence was seen in 6. Seven patients were thought to have malignant transformation based on histological or radiological characteristics of the lesion. The actuarial progression-free survival rate, including malignant transformation and outside recurrence, was 93% at 5 years and 83% at 10 years. Neurological status improved in 16 patients (15%). Permanent radiation injury occurred in 7 patients (6%).

Conclusions
Gamma Knife radiosurgery is a safe and effective treatment for cranial base meningiomas as demonstrated with a long-term follow-up period of > 7 years. Surgeons must be aware of the possibility of treatment failure, defined as local failure, marginal failure, and malignant transformation; however, this may be the natural course of meningiomas and not related to radiosurgery.
Resection of insular gliomas: the importance of lenticulostriate artery position
Authors: Moshel Yaron A. , Marcus Joshua D.S. , Parker Erik C. , Kelly Patrick J. 
Published: October 2008

Object
The object of this study was to identify characteristic preoperative angiographic and MR imaging features of safely resectable insular gliomas and describe the surgical techniques and postoperative clinical outcomes.

Methods
Thirty-eight patients with insular gliomas underwent transsylvian resection between 1995 and 2007. Patient demographics, presenting symptoms, pathological findings, and neurological outcomes were retrospectively reviewed. Preoperative MR imaging–defined tumor volumes were superimposed onto the preoperative stereotactic cerebral angiograms to determine whether the insular tumor was confined lateral to (Group I) or extended medially around (Group II) the lenticulostriate arteries (LSAs).

Results
Twenty-five patients (66%) had tumors situated lateral to the LSAs and 13 (34%) had tumors encasing the LSAs. Insular gliomas situated lateral to the LSAs led to significant medial displacement of these vessels (161 ± 39%). In 20 (80%) of these 25 cases the boundaries between tumor and brain parenchyma were well demarcated on preoperative T2-weighted MR images. In contrast, there was less displacement of the LSAs (130 ± 14%) in patients with insular gliomas extending around the LSAs on angiography. In 11 (85%) of these 13 cases, the tumor boundaries were diffuse on T2-weighted MR images. Postoperative hemiparesis or worsening of a preexisting hemiparesis, secondary to LSA compromise, occurred in 5 patients, all of whom had tumor volumes that extended medial to the LSAs. Gross-total or near-total resection was achieved more frequently in cases in which the insular glioma remained lateral to the LSAs (84 vs 54%).

Conclusions
Insular gliomas with an MR imaging–defined tumor volume located lateral to the LSAs on stereotactic angiography displace the LSAs medially by expanding the insula, have well-demarcated tumor boundaries on MR images, and can be completely resected with minimal neurological morbidity. In contrast, insular tumors that appear to surround the LSAs do not displace these vessels medially, are poorly demarcated from normal brain parenchyma on MR images, and are associated with higher rates of neurological morbidity if aggressive resection is pursued. Preoperative identification of these anatomical growth patterns can be of value in planning resection.
Recurrence following neurosurgeon-determined gross-total resection of adult supratentorial low-grade glioma: results of a prospective clinical trial
Authors: Shaw Edward G. , Berkey Brian , Coons Stephen W. , Bullard Dennis , Brachman David , Buckner Jan C. , Stelzer Keith J. , Barger Geoffrey R. , Brown Paul D. , Gilbert Mark R. , Mehta Minesh 
Published: October 2008

Object
In 1998, the Radiation Therapy Oncology Group initiated a Phase II study of observation for adults < 40 years old with cerebral low-grade glioma who underwent a neurosurgeon-determined gross-total resection (GTR).

Methods
Patient eligibility criteria included the presence of a World Health Organization Grade II astrocytoma, oligodendroglioma, or mixed oligoastrocytoma confirmed histologically; age 18–39 years; Karnofsky Performance Scale score ≥ 60; Neurologic Function Scale score ≤ 3; supratentorial tumor location; neurosurgeon-determined GTR; and pre- and postoperative MR imaging with contrast enhancement available for central review by the principal investigator. Patients were observed following GTR and underwent MR imaging every 6 months. Prognostic factors analyzed for their contribution to patient overall survival, progression-free survival (PFS), and tumor recurrence included age, sex, Karnofsky Performance Scale score, Neurologic Function Scale score, histological type, contrast enhancement on preoperative MR imaging, preoperative tumor diameter, residual disease based on postoperative MR imaging, and baseline Mini-Mental State Examination score.

Results
Between 1998 and 2002, 111 eligible patients were entered into the study. In these 111 patients, the overall survival rates at 2 and 5 years were 99 and 93%, respectively. The PFS rates in these 111 patients at 2 and 5 years were 82 and 48%, respectively. Three prognostic factors predicted significantly poorer PFS in univariate and multivariate analyses: 1) preoperative tumor diameter ≥ 4 cm; 2) astrocytoma/oligoastrocytoma histological type; and 3) residual tumor ≥ 1 cm according to MR imaging. Review of the postoperative MR imaging results revealed that 59% of patients had < 1 cm residual disease (with a subsequent 26% recurrence rate), 32% had 1–2 cm residual disease (with a subsequent 68% recurrence rate), and 9% had > 2 cm residual disease (with a subsequent 89% recurrence rate).

Conclusions
These data suggest that young adult patients with low-grade glioma who undergo a neurosurgeondetermined GTR have a > 50% risk of tumor progression 5-years postoperatively, warranting close follow-up and consideration for adjuvant treatment.
Demonstration of uneven distribution of intracranial pulsatility in hydrocephalus patients
Authors: Eide Per K. 
Published: October 2008

Object
Data from intracranial pressure (ICP) recordings in patients with hydrocephalus were reviewed to determine whether intracranial pulsatility within the cerebrospinal fluid (CSF) of cerebral ventricles (ICPLV) may differ from that within the brain parenchyma (ICPPAR), and whether pulsatility may differ between noncommunicating ventricles.

Methods
The authors retrieved data from recordings previously obtained in 7 patients with hydrocephalus (noncommunicating in 4 and communicating in 3) and shunt failure who received both an external ventricular drainage (EVD) and an ICP sensor as part of surveillance during intensive care. Simultaneous ICPLV and ICPPAR signals were available in 6 cases, and simultaneous signals from the lateral and fourth ventricles (ICPLV and ICP4V, respectively) were recorded in 1 case. The recordings with both signals were parsed into 6-second time windows. Pulsatility was characterized by the wave amplitude and rise time coefficient, and differences in pulsatility between the ICPLV and ICPPAR signals (6 cases) or ICPLV and ICP4V signals (1 case) were determined.

Results
There was uneven distribution of intracranial pulsatility in all 7 patients, shown as significantly elevated pulsatility (that is, higher wave amplitudes and rise time coefficients) within the ventricles (ICPLV) than within brain parenchyma (ICPPAR) in 6 patients, and significantly higher pulsatility in the fourth (ICP4V) than in the lateral (ICPLV) ventricles in 1 patient. Differences ≥1 mm Hg in ICP wave amplitude were found in 0.5–100% (median 9.4%) of observations in the 7 patients (total number of 6-second time windows, 68,242).

Conclusions
The present observations demonstrate uneven distribution of intracranial pulsatility in patients with hydrocephalus, higher pulse pressure amplitudes within the ventricular CSF (ICPLV) than within the brain parenchyma (ICPPAR). This may be one mechanism behind ventricular enlargement in hydrocephalus.
Combined endoscopic third ventriculostomy and choroid plexus cauterization as primary treatment of hydrocephalus for infants with myelomeningocele: long-term results of a prospective intent-to-treat study in 115 East African infants
Authors: Warf Benjamin C. , Campbell Jeffrey W. 
Published: October 2008

Object
Shunt dependence is more dangerous for children in less developed countries. Combining endoscopic third ventriculostomy (ETV) with choroid plexus cauterization (CPC) was previously shown to treat hydrocephalus more effectively than ETV alone in infants < 1 year of age. The goal of this prospective study was to evaluate the effectiveness of ETV-CPC as primary treatment of hydrocephalus in infants with myelomeningocele.

Methods
One hundred fifteen consecutive East African infants with myelomeningocele requiring treatment for hydrocephalus were intended for primary management using ETV-CPC. Patient information was prospectively entered into a database. Outcomes were evaluated by life table analysis. Potential predictors for treatment failure were evaluated using multivariate logistic regression.

Results
Ninety-three patients had a completed ETV-CPC with > 1 month of follow-up. The ETV-CPC procedure was successful in 71 patients (76%), with a mean and median follow-up of 19.0 months. Treatment failures occurred before 6 months in 86% of the patients, and none occurred after 10 months. The operative mortality rate was 1.1%, and there were no infections. Life table analysis suggested that 72% of the patients would be successfully treated using a single ETV-CPC and 78% would remain shunt-independent with reopening of a closed ETV stoma. Multivariate logistic regression showed scarring of the cistern (p = 0.021) or choroid plexus (p = 0.026) as predictors of failure, but age at the time of surgery was not a significant predictor.

Conclusions
Using ETV-CPC appears to successfully provide a more durable primary treatment of hydrocephalus for infants with spina bifida than does shunt placement. These results support ETV-CPC as the better treatment option for these children in developing countries.
Diagnosing cranial fasciitis based on distinguishing radiological features
Authors: Johnson Keyne K. , Dannenbaum Mark J. , Bhattacharjee Meenakshi B. , Illner Anna , Dauser Robert C. , Whitehead William E. , Jea Andrew , Luerssen Thomas G. 
Published: October 2008

Primary skull lesions, albeit rare in the pediatric population, have been well described and classified. These lesions are usually benign and commonly present as a painless mass. The most common lesions are epidermoid, dermoid, and Langerhans cell histiocytosis. Cranial fasciitis, encountered less frequently, is usually not considered in this differential diagnosis. Given such few cases reported, it is commonly misdiagnosed preoperatively.
The authors retrospectively reviewed data obtained in 4 patients with cranial fasciitis in whom the diagnosis was based on histopathological findings. In 2 patients the onset of the lesion was spontaneous. One patient had a lesion 4 months following a vacuum extraction and subsequent cephalohematoma formation. One patient developed a lesion following a previous craniectomy. Presentation, imaging studies, and histopathological findings were all reviewed and analyzed. All patients presented with a firm nontender mass. Radiological features included a lytic bone lesion with a mildly sclerotic margin, T1 isodensity, T2 heterogeneous hyperdensity, and heterogeneous enhancement. The enhancing portion was not bright on T2-weighted MR images, likely representing the fibrous component; the nonenhancing portion was bright on T2-weighted images, likely representing the myxoid matrix. Histopathological examination revealed proliferating fibroblasts in a myxoid matrix.
Cranial fasciitis is a benign, painless but rapidly growing lesion of the skull mainly limited to the pediatric population. It is histologically similar to nodular fasciitis, a fibroblastic proliferation of varying size. These lesions are often related to trauma but can also be insidious or can develop at a prior craniectomy site. The appropriate clinical picture and distinguishing radiographic features may help to differentiate cranial fasciitis from other lesions of the skull allowing for earlier intervention.