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Quasi-Networks in Social Relational Systems

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Systems Science and Systems Engineering 1992年第1期2卷 25-33页

作者： robert p.Gilles pieter H.M.Ruys Department of Economies Virginia Polytechnic Institute & State UniversityDepartment of Econometrics Tilburg University Blacksburg Virginia USATilburgthe Netherlands

In social sciences it is more or less generally acknowledged that (social) networks seem to be the natural tool in the organization of social activity. In the liteature on the mathematical description of social phenomena the concept of a network is hardly *** this paper we focus on the development of a’possible mathematical formualtion of the properties of a social network and a minimal and nearly complete social relational subsystem as a quasi-network within the setting of an economic trade system.

关键词： social relational system quasi-network.

phylogeny of the industrial relevant,thermophilic genera Myceliophthora and Corynascus

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Fungal Diversity 2012年第1期52卷 197-207页

作者： Joost van den Brink robert A.Samson Ferry Hagen Teun Boekhout Ronald p.de Vries CBS-KNAW Fungal Biodiversity Centre P.O.Box 851673508 AD UtrechtThe Netherlands

Species of the genus Myceliophthora and its teleomorph Corynascus have attracted increasing interest due to their potential to produce thermostable *** study re-assessed the phylogenetic relationship of 49 isolates of nine species belonging to Myceliophthora and *** species,***,was shown not to belong to the genus Myceliophthora and should be placed in the genus *** other species belonged to two phylogenetic clusters:mesophilic fungi with the type species *** and ***,and thermophilic fungi with ***,*** and *** phylogenetic data provides no clear separation of the two genera Corynascus and *** avoid confusion in future taxonomic studies,it is proposed that all existing Corynascus species be renamed to Myceliophthora,which is the old name and the one more frequently ***,this study identified two groups within the isolates listed as *** and assigned one group(five isolates)to *** based on AFLp analysis and mating *** study provides new insights into the genetic differences within the genus Myceliophthora and will therefore be essential for the interpretation of future genomic and physiological studies of these species.

关键词： Myceliophthora Corynascus Thermophiles M.heterothallica M.thermophila.Thermophilic fungi Multigene phylogeny AFLp analysis Mating behavior

Colonic manifestations of pTEN hamartoma tumor syndrome: Case series and systematic review

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World Journal of Gastroenterology 2014年第7期20卷 1833-1838页

作者： peter p Stanich robert pilarski Jonathan Rock Wendy L Frankel Samer El-Dika Marty M Meyer Division of Gastroenterology Hepatology and Nutritionthe Ohio State University Wexner Medical CenterColumbusOH 43210United States Division of Human Genetics the Ohio State University Wexner Medical CenterColumbusOH 43210United States Department of pathology the Ohio State University Wexner Medical CenterColumbusOH 43210United States

AIM: To investigate our clinical experience with the colonic manifestations of phosphatase and tensin homolog on chromosome ten (pTEN) hamartoma tumor syndrome (pHTS) and to perform a systematic literature review rega... 详细信息

关键词： Adenoma Bannayan-Riley-Ruvalcaba syndrome Colon polyps Colorectal cancer Cowden syndrome Endoscopy Ganglioneuroma Hamartoma Hyperplastic phosphatase and tensin homolog on chromosome ten

Gene bank scheduling of seed regeneration: Interim report on a long term storage study

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Journal of Integrative Agriculture 2019年第7期18卷 1529-1540页

作者： robert Redden Debra partington Australian Temperate Field Crops Collection Private Bag 260Agriculture Victoria

A major challenge for the management of gene banks is the maintenance of good seed health in the *** germplasm collections >10 000 accessions often have been acquired from different sources over a range of dates,may differ in germination at time of deposition in the gene bank,and may have genetic differences in seed *** major storage variables affecting seed longevity are temperature and seed moisture *** varieties of each pea(pisum sativus L.),lentil(Lens culinaris Medikus ***),and chickpea(Cicer arietinum L.),were stored at three temperatures;40,20,and 2°C,each with three seed moisture levels of 10.9–13.8%(high),7.9–10.3%(medium),and 7–7.8%(low),in the Australian Temperate Field Crops Collection gene *** longevity at a given storage period was estimated by the corresponding germination percentage for each *** paper is an interim report on seed viability decline in the first seven years of this seed longevity study,in which viability decline towards zero was almost completed in the three seed moisture treatments at 40°C and the 20°C high seed moisture treatment,but had not declined in the other *** longevity positively responded to a reduction in temperature and then to a reduction in seed *** number of days in storage for seed germination decline to 85%(p85),and to 50%(p50) for mean seed viability,are reported by storage/varietal *** p85 and p50 showed significant inverse linear responses with seed moisture at 40°C for pea and lentil varieties,with intra-specific variation for *** long term trial aims to provide informed timing of seed regeneration for accessions in a gene bank.

关键词： gene bank storage moisture level temperature regeneration pea lentil chickpea

Digital imaging approaches for phenotyping whole plant nitrogen and phosphorus response in Brachypodium distachyon

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Journal of Integrative plant Biology 2014年第8期56卷 781-796页

作者： Richard poiré Vincent Chochois Xavier R.R.Sirault John p.Vogel Michelle Watt robert T.Furbank CSIRO plant Industry High Resolution plant phenomics Centre CSIRO Plant Industry USDA-ARS Western Regional Research Center

This work evaluates the phenotypic response of the model grass （Brachypodium distacbyon （L.） p. Beauv.） to nitrogen and phosphorus nutrition using a combination of imaging techniques and destructive harvest of shoots and roots. Reference line Bd21-3 was grown in pots using 11 phosphorus and 11 nitrogen concentrations to establish a dose-response curve. Shoot biovolume and biomass, root length and biomass, and tissue phosphorus and nitrogen concentrations increased with nutrient concentration. Shoot biovolume, estimated by imaging, was highly correlated with dry weight （R2 〉 0.92） and both biovolume and growth rate responded strongly to nutrient availability. Higher nutrient supply increased nodal root length more than other root types. photochemical efficiency was strongly reduced by low phosphorus concentrations as early as 1 week after germination, suggesting that this measurement may be suitable for high throughput screening of phosphorus response. In contrast, nitrogen concentration had little effect on photochemical efficiency. Changes in biovolume over time were used to compare growth rates of four accessions in response tonitrogen and phosphorus supply. We demonstrate that a time series image-based approach coupled with mathematical modeling provides higher resolution of genotypic response to nutrient supply than traditional destructive techniques and shows promise for high throughput screening and determina- tion of genomic regions associated with superior nutrient use efficiency.

关键词： Nutrients uptake phenomics photosynthesis root shootCitation: poire R, Chochois V, Sirault XRR, Vogel Jp, Watt M, Furbank RT(2o14) Digital imaging approaches for phenotyping whole plantnitrogen and phosphorus response in Brachypodium distachyon.

Strong Laws of Large Numbers for Double Sums of Banach Space Valued Random Elements

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Acta Mathematica Sinica,English Series 2019年第5期35卷 583-596页

作者： robert pARKER Andrew ROSALSKY Department of Biostatistics University of Florida Department of Statistics University of Florida

For a double array {V_(m,n), m ≥ 1, n ≥ 1} of independent, mean 0 random elements in a real separable Rademacher type p(1 ≤ p ≤ 2) Banach space and an increasing double array {b_(m,n), m ≥1, n ≥ 1} of positive constants, the limit law ■ and in L_p as m∨n→∞ is shown to hold if ■ This strong law of large numbers provides a complete characterization of Rademacher type p Banach spaces. Results of this form are also established when 0 p ≤ 1 where no independence or mean 0 conditions are placed on the random elements and without any geometric conditions placed on the underlying Banach space.

关键词： Real separable Banach space double array of independent random elements strong law of large numbers almost sure convergence Rademacher type p Banach space convergence in Lp

Travelling Waves for a Density Dependent Diffusion Nagumo Equation over the Real Line

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Communications in Theoretical physics 2012年第7期58卷 5-11页

作者： robert A. Van Gorder Department of Mathematics University of Central FloridaP.O.Box 161364OrlandoFL 32816-1364USA

We consider the density dependent diffusion Nagumo equation, where the diffusion coefficient is a simple power function. This equation is used in modelling electrical pulse propagation in nerve axons and in population genetics (amongst other areas). In the present paper, the δ-expansion method is applied to a travelling wave reduction of the problem, so that we may obtain globally valid perturbation solutions (in the sense that the perturbation solutions are valid over the entire infinite domain, not just locally; hence the results are a generalization of the local solutions considered recently in the literature). The resulting boundary value problem is solved on the real line subject to conditions at z →±∞. Whenever a perturbative method is applied, it is important to discuss the accuracy and convergence properties of the resulting perturbation expansions. We compare our results with those of two different numerical methods (designed for initial and boundary value problems, respectively) and deduce that the perturbation expansions agree with the numerical results after a reasonable number of iterations. Finally, we are able to discuss the influence of the wave speed c and the asymptotic concentration value α on the obtained solutions. Upon recasting the density dependent diffusion Nagumo equation as a two-dimensional dynamical system, we are also able to discuss the influence of the nonlinear density dependence (which is governed by a power-law parameter m) on oscillations of the travelling wave solutions.

关键词： density dependent diffusion equation nonlinear partial differential equation perturbation method δ-expansion method

prognostic factors and survival after surgical resection of pancreatic neuroendocrine tumor with validation of established and modified staging systems

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Hepatobiliary & pancreatic Diseases International 2018年第2期17卷 169-175页

作者： Nikolaos Benetatos James Hodson Ravi Marudanayagam robert p Sutcliffe John R Isaac John Ayuk Tahir Shah Keith J roberts The HpB Unit Queen Elizabeth Hospital Birmingham University Hospitals Birmingham NHS Foundation Trust Institute of Translational Medicine Queen Elizabeth Hospital Birmingham University Hospitals Birmingham Endocrinology Queen Elizabeth Hospital Birmingham University Hospitals Birmingham Liver Unit Queen Elizabeth Hospital Birmingham University Hospital of Birmingham NHS Foundation Trust

Background: pancreatic neuroendocrine tumors(pNETs) display wide heterogeneity with highly variable prognosis. This study aimed to identify variables related to survival after surgical resection of ***: A total of 143 patients were identified from a prospectively maintained database. patient characteristics were analyzed and prognostic factors for overall survival and progression-free survival were evaluated. The WHO, ENETS and AJCC scoring systems were applied to the cohort, and their ability to predict patient outcomes were ***: Multivariate analysis found that female gender, lymph node metastases and increasing WHO2010 grade to be independently associated with reduced overall survival(p patients requiring multi-visceral resection or debulking surgery found to be associated with shortest survival. ROC analysis found the ENETS and AJCC scoring systems to be similarly predictive of 5-year overall survival. Modified Ki67 significantly improved its accuracy in predicting 5-year overall survival(AUROC: 0.699 vs 0.605;p poor outcomes. There seems to be no significant difference between enucleation and anatomical segmental resection. Available scoring systems have reasonable accuracy in stratifying disease severity, with no system identified as being *** stratification with modified grading systems needs further validation before applied in clinical practice.

关键词： pancreatic neuroendocrine tumors prognostic factors Validation of staging systems

Inhibition of sperm motility does not affect live-dead separation of bull sperm by glass beads

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Asian Journal of Andrology 2001年第3期3卷 193-198页

作者： robert H.Foote Department of Animal Science Cornell University Ithaca NY 14853-4801 USA

Aim: This study was designed to explore factors which influence binding of dead versus live sperm to glass ***: Multiple semen collections from bulls were used to explore selective filtration of bull sperm as influencedby nonlethal inhibition of sperm motility with fluoride, killing of sperm by quick-freezing, alteration of the glass sur-face with silicone, and different intervals of sexual rest between semen collections. Results: A comparison of glassspheres 100, 200 and 390μm in diameter indicated that 200 μm spheres were optimal for selective filtration. Quantita-tive separation of live from dead sperm was demonstrated with a correlation between the percentage of motile sperm andretention of sperm by the filter of r = -0.87 (p p to 0.02 mol/L NaFl did not alter the proportion ofsperm retained by the filter despite inhibiting sperm motility during filtration, an inhibition which was reversible. pro-portions of live-dead sperm, based upon eosin staining, were unaffected by fluoride. Coating the glass spheres with sil-icone greatly reduced selective filtration. Dead sperm adherence to glass was reduced and resistance to NaFl inhibitionwas increased by daily ejaculation versus one-week intervals of sexual rest. Conclusion; These studies indicate thatthe adherence of sperm to glass is primarily due to some form of physico-chemical change accompanying death of thesperm cell independent of active sperm motility. This attraction between the sperm plasma membrane and glass is modi-fied by the age of the ejaculated sperm. This information is useful in evaluating different clinical procedures used forsperm separation. (Asian J Androl 2001 Sep; 3: 193-198)

关键词： sperm motility glass spere filters silicone fluorides inhibition