bluuebunny/crossref_metadata_2025_split huggingface dataset:
How private contract enforcement mechanisms can succeed where public institutions
Authors: Gow Hamish R. , Streeter Deborah H. , Swinnen Johan F.M. 
Published: May 2008

AbstractThe enforcement of contracts is necessary for efficient exchange and investment in economic activities. Contracts can be enforced through a variety of mechanisms, both public and private. However, in many developing and transitional countries these public institutions are either absent or ineffective in ensuring contract enforcement. Under such conditions, private enforcement mechanisms may provide a suitable replacement for public enforcement institutions. This may be done externally through a third party or internally through self‐enforcing agreements. This paper analyzes the use of “self‐enforcing” arrangements or “internal” private enforcement mechanisms. Using a case study of an agri‐business in a transition economy — Juhocukor a.s., a Slovakian sugar processor — we show that the use of “internal” private contract enforcement mechanisms can have a significant positive effect on output and efficiency for both partners to the exchange transaction in an environment characterized by the absence or ineffectiveness of public enforcement institutions.
Cracking the whip on childhood mortality – role of the specialized neonatal unit in Eritrea
Authors: Zemichael O , Nyarang'o P , Mufunda J 
Published: May 2008

AbstractHealth care services in developing countries are being challenged by high childhood mortality rates. Although there have been tremendous strides made in reducing infant mortality rates largely due to vaccinations and improved standards of living, a lot remains to be done to reduce neonatal mortality. Achievement of the Millennium Development Goal (MDG) number 4 on childhood mortality will remain unattainable in most developing countries unless purpose based interventions targeted at reducing neonatal mortality are instituted. This viewpoint is based on the experiences gained in Eritrea, a country that gained independence less than twenty years ago following a protracted war that left a trail of destruction of infrastructure in general and health facilities in particular. War that broke out with Ethiopia less than 10 years into its independence and border conflicts followed by a no peace no war stalemate situation aggravated by frequent droughts have continued to throttle economic recovery, reconstruction and rehabilitative efforts. The population is estimated at 3.5 million comprising of nine ethnic groups who speak different languages. The country has a surface area of 124 000 km2 which shares borders with Sudan, Ethiopia, Djibouti and the Red Sea.Conclusion: Attainment of the MDG number 4 on reduction of childhood mortality can be achieved by addressing morbidities of the neonate where the bottle neck currently appears to be sited.
Isolation and characterization of new polymorphic microsatellite loci in the mixotrophic orchid Limodorum abortivum L. Swartz (Orchidaceae)
Authors: LOMBARDO V. TRANCHIDA , HOPKINS S. E. , SELOSSE M.‐A. , COZZOLINO S. , TAYLOR D. L. 
Published: May 2008

AbstractHere, we report the isolation and characterization of 11 polymorphic microsatellites in Limodorum abortivum. Allele variability has been characterized in three populations from Southern Italy and France. The number of alleles ranged from one to six per locus with an average of 3.8 alleles per locus. Observed and expected heterozygosity values ranged from 0.000 to 1.000 and from 0.492 to 0.806, respectively, with striking differences among populations. These microsatellites should be valuable tools for studying fine‐scale genetic structure of scattered Limodorum abortivum populations, patterns of relationship with closely related taxa and the evolutionary ecology of its mycorrhizal interactions.
Listeria monocytogenes and Salmonella spp. in Raw Milk Produced in Brazil: Occurrence and Interference of Indigenous Microbiota in their Isolation and Development
Authors: Nero L. A. , De Mattos M. R. , De Aguiar Ferreira Barros M. , Ortolani M. B. T. , Beloti V. , De Melo Franco B. D. G. 
Published: May 2008

SummaryThis study aimed to verify the occurrence of Listeria monocytogenes and Salmonella spp. in raw milk produced in Brazil. On account of the poor microbiological quality of this product, possible interference from the indigenous microbiota in these pathogens was also evaluated. Two‐hundred and ten raw milk samples were collected in four important milk‐producing areas in Brazil, tested for L. monocytogenes and Salmonella spp. presence, and for enumeration of indicator microorganisms: mesophilic aerobes, total coliforms and Escherichia coli. The interference of the indigenous microbiota in the isolation procedures was also tested, as well the frequency of naturally occurring raw milk strains with antagonistic activity against both pathogens. The pathogens were not isolated in any raw milk sample, but poor microbiological quality was confirmed by the high levels of indicator microorganisms. When present at high levels, the indigenous microbiota generated an evident interference in the methodologies of L. monocytogenes and Salmonella spp. isolation, mainly when the pathogens appeared at low levels. Three‐hundred and sixty raw milk strains were tested for antagonistic activity against both pathogens, and 91 (25.3%) showed inhibitory activity against L. monocytogenes and 33 (9.2%) against Salmonella spp. The majority of the antagonistic strains were identified as Lactic Acid Bacteria species, mainly Lactococcus lactis subsp. lactis and Enterococcus faecium, known by antimicrobial substance production.
Multiplex PCR and RPLA Identification of Staphylococcus aureus Enterotoxigenic Strains From Bulk Tank Milk
Authors: Zouharova M. , Rysanek D. 
Published: May 2008

SummaryEnterotoxigenic Staphylococcus aureus in raw milk poses a potential health hazard to consumers, and the identification of such strains should be used as part of a risk analysis of milk and milk products. The primary purpose of this study was to investigate the occurrence of enterotoxigenic S. aureus strains in raw milk supplied for dairy processing in the Czech Republic. A further aim was to compare the production of staphylococcal enterotoxins (SEs) with the presence of the corresponding genes. This was undertaken using multiplex polymerase chain reaction (PCR) and reversed passive latex agglutination (RPLA). Out of 440 bulk tank milk samples from 298 dairy herds, 70 proved positive for S. aureus (15.9%). Staphylococcal enterotoxin genes (ses) were detected in 39 (55.7%) isolates. The genes most commonly detected were sei (38.6%), seg (31.4%) and sea (27.1%). Genes seb, seh, sed, sej and sec were observed in 10%, 4.3%, 2.9%, 2.9% and 1.4% of strains respectively. Genes see and sel did not occur. The most frequently detected genotypes were seg, sei at 11.4%; sea at 10.0%; and sea, seg, sei at 8.6%. Toxin production was observed in nine (12.9%) S. aureus isolates. Seven strains were detected as SEB‐ (10%) and two as SED‐ (2.9%) producing. A relatively high number (32%) of discrepancies between the results with multiplex PCR and RPLA assays was obtained, particularly on account of SEA. Nineteen strains were sea positive by PCR but SEA negative by RPLA, and one strain was sec positive and SEC negative. The results of both methods were identical concerning SEB and SED. It was concluded that detection of ses by PCR was a useful additional tool to support identification of enterotoxigenic strains.
A Review of Management Practices for the Control of Anthrax in Animals: The 2005 Anthrax Epizootic in North Dakota – Case Study
Authors: Ndiva Mongoh M. , Dyer N. W. , Stoltenow C. L. , Hearne R. , Khaitsa M. L. 
Published: May 2008

SummaryOutbreaks of anthrax have diverse consequences on society. Establishing the appropriate control strategies is very important and crucial in reducing the socio‐economic impact of the disease. Control measures are aimed at breaking the cycle of infection, and their implementation must be adhered to rigorously. The objectives of this paper were: (i) to review the control strategies currently used in management of anthrax in animals and (ii) to describe management strategies used by producers in North Dakota during the 2005 anthrax outbreak in livestock. Anthrax control strategies were divided in to strategies that apply before, during, and after an anthrax outbreak. This paper also highlights the problems or constraints faced by North Dakota producers in controlling anthrax during the outbreak of 2005.
Prevalence of Tibiofemoral Osteoarthritis 15 Years after Nonoperative Treatment of Anterior Cruciate Ligament Injury
Authors: Neuman Paul , Englund Martin , Kostogiannis Ioannis , Friden Thomas , Roos Harald , Dahlberg Leif E. 
Published: May 2008

Background The occurrence of osteoarthritis (OA), associated meniscal injuries, meniscectomy, and patient-related measures for patients treated nonoperatively after anterior cruciate ligament (ACL) injuries have not been well described in the literature in terms of natural history. Hypothesis Patients with ACL injury can achieve a low occurrence of tibiofemoral OA and good knee function when treated without ACL reconstruction. Study Design Cohort study (prognosis); Level of evidence, 2. Methods One hundred consecutive patients with an acute, complete ACL injury were observed for 15 years. All patients were primarily treated with activity modification and without ACL reconstruction. To achieve improved functional stability, supervised physical therapy was initiated early after injury. The patients were examined using anteroposterior weightbearing radiography. The Knee injury and Osteoarthritis Outcome Score (KOOS) was used to quantify knee-related symptoms and knee function. Results Seventy-nine patients consented to radiographic examination and 93 completed the KOOS questionnaire. Thirteen patients (16%), all of whom were among the 35 patients whose knees were meniscectomized, developed radiographic tibiofemoral OA. In contrast, none of the remaining nonmeniscectomized and radiographed knees developed OA (n = 44) ( P < .0001). Sixty-three patients (68%) had an asymptomatic knee. Twenty-two patients (23%) had undergone ACL reconstruction with a mean time of 4 years after injury. Conclusion The study had a favorable long-term outcome regarding incidence of radiographic knee OA, knee function and symptoms, and need for ACL reconstruction. Although risk factors for posttraumatic OA are multifactorial, the primary risk factor that stood out in this study was if a meniscectomy had been performed. Early activity modification and neuromuscular knee rehabilitation might also have been related to the low prevalence of radiographic knee OA. In patients with ACL injury willing to moderate activity level to avoid reinjury, initial treatment without ACL reconstruction should be considered.
Prospective Evaluation of Concurrent Meniscus Transplantation and Articular Cartilage Repair
Authors: Rue John-Paul H. , Yanke Adam B. , Busam Matthew L. , McNickle Allison G. , Cole Brian J. 
Published: May 2008

Background Recognition of the symbiotic relationship between the meniscus and articular cartilage is critical to the success of meniscal allograft transplantation. Simultaneous combined meniscal allograft transplantation and cartilage restoration procedures have been proposed for patients with a symptomatic postmeniscectomy knee with a focal chondral defect that would have traditionally been considered a contraindication to meniscal allograft transplantation. Hypothesis Combined meniscal allograft transplantation and cartilage restoration procedures can be used to neutralize traditional contraindications to meniscal allograft transplantation with results comparable to either procedure performed in isolation. Study Design Case series; Level of evidence, 4. Methods Thirty patients underwent 31 combined meniscal allograft transplantation and cartilage restoration procedures between 1997 and 2004. These patients were prospectively studied, and completed standardized outcome surveys (including Lysholm, International Knee Documentation Committee, and Short Form-12 scales) preoperatively and annually thereafter for a minimum of 2-year follow-up. Patients were grouped according to concomitant procedure: 16 (52%) underwent meniscal allograft transplantation combined with autologous chondrocyte implantation; 15 (48%) had meniscal allograft transplantation combined with an osteochondral allograft. Two patients were lost to follow-up, leaving 29 procedures for review. Results As a combined group, statistically significant improvements were observed in all standardized outcomes scores and satisfaction scales, except Short Form-12 mental, at a mean 3.1-year follow-up. Excluding the 2 lost to follow-up, 76% of all study participants (80% autologous chondrocyte implantation; 71 % osteochondral allograft) reported that they were completely (31 %) or mostly (45%) satisfied with their results. Overall, 48% of patients (60% autologous chondrocyte implantation; 36% osteochondral allograft) were classified as normal or nearly normal at their most recent follow-up using the International Knee Documentation Committee examination score. Ninety percent of patients would have the surgery again. Conclusion Combined meniscal allograft transplantation and cartilage restoration offers a safe alternative for patients with persistent symptoms after meniscectomy and focal cartilage injury. Results of combined procedures were comparable to published reports of these procedures performed in isolation. Long-term follow-up is needed to define the survivorship of these procedures in a young patient population.
Alternative contingency table measures improve the power and detection of multifactor dimensionality reduction
Authors: Bush William S , Edwards Todd L , Dudek Scott M , McKinney Brett A , Ritchie Marylyn D 
Published: May 2008

Abstract

Background
Multifactor Dimensionality Reduction (MDR) has been introduced previously as a non-parametric statistical method for detecting gene-gene interactions. MDR performs a dimensional reduction by assigning multi-locus genotypes to either high- or low-risk groups and measuring the percentage of cases and controls incorrectly labelled by this classification – the classification error. The combination of variables that produces the lowest classification error is selected as the best or most fit model. The correctly and incorrectly labelled cases and controls can be expressed as a two-way contingency table. We sought to improve the ability of MDR to detect gene-gene interactions by replacing classification error with a different measure to score model quality.

Results
In this study, we compare the detection and power of MDR using a variety of measures for two-way contingency table analysis. We simulated 40 genetic models, varying the number of disease loci in the model (2 – 5), allele frequencies of the disease loci (.2/.8 or .4/.6) and the broad-sense heritability of the model (.05 – .3). Overall, detection using NMI was 65.36% across all models, and specific detection was 59.4% versus detection using classification error at 62% and specific detection was 52.2%.

Conclusion
Of the 10 measures evaluated, the likelihood ratio and normalized mutual information (NMI) are measures that consistently improve the detection and power of MDR in simulated data over using classification error. These measures also reduce the inclusion of spurious variables in a multi-locus model. Thus, MDR, which has already been demonstrated as a powerful tool for detecting gene-gene interactions, can be improved with the use of alternative fitness functions.
FLI-1 Flightless-1 and LET-60 Ras control germ line morphogenesis in C. elegans
Authors: Lu Jiamiao , Dentler William L , Lundquist Erik A 
Published: May 2008

Abstract

Background
In the C. elegans germ line, syncytial germ line nuclei are arranged at the cortex of the germ line as they exit mitosis and enter meiosis, forming a nucleus-free core of germ line cytoplasm called the rachis. Molecular mechanisms of rachis formation and germ line organization are not well understood.

Results
Mutations in the fli-1 gene disrupt rachis organization without affecting meiotic differentiation, a phenotype in C. elegans referred to here as the germ line morphogenesis (Glm) phenotype. In fli-1 mutants, chains of meiotic germ nuclei spanned the rachis and were partially enveloped by invaginations of germ line plasma membrane, similar to nuclei at the cortex. Extensions of the somatic sheath cells that surround the germ line protruded deep inside the rachis and were associated with displaced nuclei in fli-1 mutants. fli-1 encodes a molecule with leucine-rich repeats and gelsolin repeats similar to Drosophila flightless 1 and human Fliih, which have been shown to act as cytoplasmic actin regulators as well as nuclear transcriptional regulators. Mutations in let-60 Ras, previously implicated in germ line development, were found to cause the Glm phenotype. Constitutively-active LET-60 partially rescued the fli-1 Glm phenotype, suggesting that LET-60 Ras and FLI-1 might act together to control germ line morphogenesis.

Conclusion
FLI-1 controls germ line morphogenesis and rachis organization, a process about which little is known at the molecular level. The LET-60 Ras GTPase might act with FLI-1 to control germ line morphogenesis.
Testing a hypothesis of unidirectional hybridization in plants: Observations on Sonneratia, Bruguiera and Ligularia
Authors: Zhou Renchao , Gong Xun , Boufford David , Wu Chung-I , Shi Suhua 
Published: May 2008

AbstractBackgroundWhen natural hybridization occurs at sites where the hybridizing species differ in abundance, the pollen load delivered to the rare species should be predominantly from the common species. Previous authors have therefore proposed a hypothesis on the direction of hybridization: interspecific hybrids are more likely to have the female parent from the rare species and the male parent from the common species. We wish to test this hypothesis using data of plant hybridizations both from our own experimentation and from the literature.ResultsBy examining the maternally inherited chloroplast DNA of 6 cases of F1 hybridization from four genera of plants, we infer unidirectional hybridization in most cases. In all 5 cases where the relative abundance of the parental species deviates from parity, however, the direction is predominantly in the direction opposite of the prediction based strictly on numerical abundance.ConclusionOur results show that the observed direction of hybridization is almost always opposite of the predicted direction based on the relative abundance of the hybridizing species. Several alternative hypotheses, including unidirectional postmating isolation and reinforcement of premating isolation, were discussed.
Differences in mtDNA haplogroup distribution among 3 Jewish populations alter susceptibility to T2DM complications
Authors: Feder Jeanette , Blech Ilana , Ovadia Ofer , Amar Shirly , Wainstein Julio , Raz Itamar , Dadon Sarah , Arking Dan E , Glaser Benjamin , Mishmar Dan 
Published: May 2008

Abstract

Background
Recent genome-wide association studies searching for candidate susceptibility loci for common complex diseases such as type 2 diabetes mellitus (T2DM) and its common complications have uncovered novel disease-associated genes. Nevertheless these large-scale population screens often overlook the tremendous variation in the mitochondrial genome (mtDNA) and its involvement in complex disorders.

Results
We have analyzed the mitochondrial DNA (mtDNA) genetic variability in Ashkenazi (Ash), Sephardic (Seph) and North African (NAF) Jewish populations (total n = 1179). Our analysis showed significant differences (p < 0.001) in the distribution of mtDNA genetic backgrounds (haplogroups) among the studied populations. To test whether these differences alter the pattern of disease susceptibility, we have screened our three Jewish populations for an association of mtDNA genetic haplogroups with T2DM complications. Our results identified population-specific susceptibility factors of which the best example is the Ashkenazi Jewish specific haplogroup N1b1, having an apparent protective effect against T2DM complications in Ash (p = 0.006), being absent in the NAF population and under-represented in the Seph population. We have generated and analyzed whole mtDNA sequences from the disease associated haplogroups revealing mutations in highly conserved positions that are good candidates to explain the phenotypic effect of these genetic backgrounds.

Conclusion
Our findings support the possibility that recent bottleneck events leading to over-representation of minor mtDNA alleles in specific genetic isolates, could result in population-specific susceptibility loci to complex disorders.
Comparative analysis of transcriptional profiling of CD3+, CD4+ and CD8+ T cells identifies novel immune response players in T-Cell activation
Authors: Wang Min , Windgassen Dirk , Papoutsakis Eleftherios T 
Published: May 2008

Abstract

Background
T-cell activation is an essential step of the immune response and relies on the tightly controlled orchestration of hundreds of genes/proteins, yet the cellular and molecular events underlying this complex process are not fully understood, especially at the genome-scale. Significantly, a comparative genome-scale transcriptional analysis of two T-cell subsets (CD4+ and CD8+) against each other and against the naturally mixed population (CD3+ cells) remains unexplored.

Results
Comparison of the microarray-based gene expression patterns between CD3+ T cells, and the CD4+ and CD8+ subsets revealed largely conserved, but not identical, transcriptional patterns. We employed a Gene-Ontology-driven transcriptional analysis coupled with protein abundance assays in order to identify novel T-cell activation genes and cell-type-specific genes associated with the immune response. We identified potential genes involved in the communication between the two subsets (including IL23A, NR4A2, CD83, PSMB2, -8, MIF, IFI16, TNFAIP1, POU2AF1, and OTUB1) and would-be effector-function-specific genes (XCL2, SLAMF7, TNFSF4, -5, -9, CSF3, CD48 and CD244). Chemokines induced during T-cell activation, but not previously identified in T cells, include CCL20, CXCL9, -10, -11 (in all three populations), and XCL2 (preferentially in CD8+ T cells). Increased expression of other unexpected cytokines (GPI, OSM and MIF) suggests their involvement in T-cell activation with their functions yet to be examined. Differential expression of many receptors, not previously reported in the context of T-cell activation, including CCR5, CCR7, IL1R2, IL1RAP, IL6R, TNFRSF25 and TNFRSF1A, suggests their role in this immune process. Several receptors involved in TCR activation (CD3D, CD3G, TRAT1, ITGAL, ITGB1, ITGB2, CD8A and B (CD8+ T-cell specific) along with LCK, ZAP70 and TYROBP were synchronously downregulated. Members of cell-surface receptors (HLA-Ds and KLRs), none previously identified in the context of T-cell activation, were also downregulated.

Conclusion
This comparative genome-scale, transcriptional analysis of T-cell activation in the CD4+ and CD8+ subsets and the mixed CD3+ populations made possible the identification of many immune-response genes not previously identified in the context of T-cell activation. Significantly, it made possible to identify the temporal patterns of many previously known T-cell activation genes, and also identify genes implicated in effector functions of and communication between CD4+ and CD8+ T cells.