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Search Results: 1 - 10 of 406078 matches for " Barbara M. Sanborn "
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Long Chain Polyunsaturated Fatty Acids Alter Oxytocin Signaling and Receptor Density in Cultured Pregnant Human Myometrial Smooth Muscle Cells
Paul Y. Kim, Miao Zhong, Yoon-Sun Kim, Barbara M. Sanborn, Kenneth G. D. Allen
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041708
Abstract: Epidemiological studies and interventional clinical trials indicate that consumption of long chain n-3 polyunsaturated fatty acids (LC n-3 PUFA) such as docosahexaenoic acid (DHA) lengthen gestational duration. Although the mechanisms are not well understood, prostaglandins (PG) of the 2-series are known to play a role in the initiation and progress of labor. In animal studies, modest DHA provision has been shown to reduce placental and uterine PGE2 and PGF2α, matrix metalloproteinase (MMP)-2 and MMP-9 expression, and placental collagenase activity. However, modulation of PG biosynthesis may not account for all the effects of LC n-3 PUFAs in labor. We investigated one potential PG-independent mechanism of LC PUFA action using cultured pregnant human myometrial smooth muscle cells. Our goal was to characterize the effect of LC PUFA treatment on oxytocin signaling, a potent uterotonic hormone involved in labor. The addition of 10 μM–100 μM DHA or arachidonic acid (AA) to the culture media for 48 h resulted in dose dependent enrichment of these fatty acids in membrane lipid. DHA and AA significantly inhibited phosphatidylinositol turnover and [Ca2+]i mobilization with oxytocin stimulation compared to bovine serum albumin control and equimolar oleic acid. DHA and AA significantly reduced oxytocin receptor membrane concentration without altering binding affinity or rate of receptor internalization. These findings demonstrate a role for LC n-3 PUFAs in regulation of oxytocin signaling and provide new insight into additional mechanisms pertaining to reports of dietary fish and fish oil consumption prolonging gestation.
Dynamical Invariants and Berry's Phase for Generalized Driven Harmonic Oscillators
Barbara Sanborn,Sergei K. Suslov,Luc Vinet
Physics , 2011,
Abstract: We present quadratic dynamical invariant and evaluate Berry's phase for the time-dependent Schroedinger equation with the most general variable quadratic Hamiltonian.
New records of Brazilian cicadas including the description of a new species (Hemiptera: Cicadoidea, Cicadidae)
Sanborn, Allen F.;
Neotropical Entomology , 2008, DOI: 10.1590/S1519-566X2008000600010
Abstract: a new species of proarna st?l is described from southern brazil. proarna gianucai sp. nov. is distinguished by its coloration and genitalia. the species inhabits coastal dune environments and is associated with the perennial grass panicum racemosum (p. beauv.) spreng. adults are active from december to march. the first records of carineta durantoni boulard, carineta gemella boulard, carineta pilifera walker, fidicina christinae boulard & martinelli, fidicina torresi boulard & martinellli, fidicinoides determinata (walker), fidicinoides distanti (goding), fidicinoides glauca (goding), majeorona truncata goding, and zammara columbia distant for brazil are provided. the new species and new records bring the total cicada diversity of brazil to 146 species.
Nonequilibrium total dielectric function approach to the electron Boltzmann equation for inelastic scattering in doped polar semiconductors
B. A. Sanborn
Physics , 1995, DOI: 10.1103/PhysRevB.51.14247
Abstract: This paper describes a simple and general method for deriving the inelastic collision term in the electron Boltzmann equation for scattering from a coupled electron-phonon system, and applies the method to the case of doped polar semiconductors. In the Born approximation, the inelastic differential scattering rate $W^{inel}$ can be expressed in terms of the nonequilibrium total dynamic dielectric function, which includes both electronic and lattice contributions. Within the random-phase approximation $W^{inel}$ separates into two components: an electron-electron interaction containing the nonequilibrium distribution function for excitations of the electron gas, and a Fr\"{o}hlich interaction including the phonon distribution function and self-energy due to polarization of the electrons. Each of these two interactions is screened by only the electronic part of the total dielectric function which contains the high frequency dielectric constant, unlike commonly used expressions which contain the static dielectric constant. Detailed balance between plasmons and electron-hole pairs in steady state is used to eliminate the nonequilibrium plasmon distribution from the Boltzmann equation, resulting in a dynamically screened electron-electron collision term. The phonon self-energy modifies the longitudinal optical phonon dispersion so that two hybrid normal modes contribute to the electron-phonon collision term.
Electron-electron interactions, coupled plasmon-phonon modes, and mobility in n-type GaAs
B. A. Sanborn
Physics , 1995, DOI: 10.1103/PhysRevB.51.14256
Abstract: This paper investigates the mobility of electrons scattering from the coupled system of electrons and longitudinal optical (LO) phonons in n-type GaAs. The Boltzmann equation is solved exactly for low electric fields by an iterative method, including electron-electron and electron-LO phonon scattering dynamically screened in the random-phase-approximation (RPA). The LO phonon self-energy is treated in the plasmon-pole approximation. Scattering from ionized impurities screened in static RPA is calculated with phase-shift cross sections, and scattering from RPA screened deformation potential and piezoelectric acoustic phonons is included in the elastic approximation. The results show that dynamic screening and plasmon-phonon coupling significantly modify inelastic scattering at low temperatures and densities. The effect on mobility is obscured by ionized impurity scattering in conventionally doped material, but should be important in modulation doped structures. For uncompensated bulk n-type GaAs, the RPA phase-shift model for electron-impurity scattering gives lower drift mobilities than the standard Thomas-Fermi or Born calculations which are high compared to experiment. Electron-electron scattering lowers the mobility further, giving improved agreement with experiment though discrepancies persist at high donor concentrations ($n>10^{18}{\rm cm}^{-3}$). When impurities are ignored, inelastic scattering from the coupled electron-phonon system is the strongest scattering mechanism at 77 K for moderate doping. This result differs from the standard model neglecting mode coupling and electron-electron scattering which has the acoustic modes dominant in this regime.
Total dielectric function approach to the electron Boltzmann equation for scattering from a two-dimensional coupled mode system
B. A. Sanborn
Physics , 1995,
Abstract: The nonequilibrium total dielectric function lends itself to a simple and general method for calculating the inelastic collision term in the electron Boltzmann equation for scattering from a coupled mode system. Useful applications include scattering from plasmon-polar phonon hybrid modes in modulation doped semiconductor structures. This paper presents numerical methods for including inelastic scattering at momentum-dependent hybrid phonon frequencies in the low-field Boltzmann equation for two-dimensional electrons coupled to bulk phonons. Results for mobility in GaAs show that the influence of mode coupling and dynamical screening on electron scattering from polar optical phonons is stronger for two-dimensional electrons than was previously found for the three dimensional case.
昆虫学报 , 2006,
Abstract: 描述了1936年6月采自陕西省的蝉科两新种:Neotannashensiensissp.n.和Terpnosia.shaanxiensissp.n.。正模标本保存在北卡罗来纳州立大学昆虫标本馆(NCSU);副模保存在作者处。
A Survey on Context-Aware Sensing for Body Sensor Networks  [PDF]
Barbara T. Korel, Simon G. M. Koo
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.28069
Abstract: Context awareness in Body Sensor Networks (BSNs) has the significance of associating physiological user activity and the environment to the sensed signals of the user. The context information derived from a BSN can be used in pervasive healthcare monitoring for relating importance to events and specifically for accurate episode detection. In this paper, we address the issue of context-aware sensing in BSNs, and survey different techniques for deducing context awareness.
Comparison of Medical Education between Germany and Poland Considering Internal Medicine, General Medicine, and Anaesthesia  [PDF]
Monika Kolodziej, Ursula Gresser, Barbara M. Richartz
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.715203
Abstract: With the continuing shortage of physicians in Germany, healthcare is increasingly being sustained by foreign physicians. The present paper addresses the comparability of medical education curricula in Germany and Poland and the qualification of physicians having Polish exams and specialist medical training for clinics and practices in Germany. The Medical Licensing Act and the Model Specialty Training Regulation of the German Medical Association were compared to the respective Polish regulations for medical education. In orienting surveys, physicians with Polish exams were questioned and they provided information regarding their current situation in German healthcare. Based on educational criteria, physicians with Polish exams and specialist training are well suited to work in medicine in Germany. They receive theoretical education comparable to that of German physicians; practical education during specialist medical training is more extensive in Germany. The survey could yield that Germany, as a job market, is very appealing for physicians with Polish exams. The primary reasons for this are better opportunities for training as well as better compensation. The solicitation of physicians equates to an economic loss for Poland. Nevertheless, the solicited physicians benefit from working in Germany. The European Union lacks common, detailed European standards for medical education.
Secular States, Muslim Law and Islamic Religious Culture: Gender Implications of Legal Struggles in Hybrid Legal Systems in Contemporary West Africa Les états la ques, le droit musulman et la pratique culturelle dite islamique : Implications pour les femmes des luttes juridiques dans les systèmes juridiques hybrides de l’Afrique de l’Ouest contemporaine
Barbara M. Cooper
Droit et Cultures , 2010,
Abstract: This article sets out the differing approaches of three West African states (Niger, Senegal, and Nigeria) towards reconciling the multiple legal systems (Islamic, western, military) they have inherited as ostensibly secular states in regions with prominent Muslim populations. While Senegal has adopted a Family Code that appears to modify and regulate some of the perceived injustices of Islamic law in family life, a number of states within Nigeria have gone in the opposite direction, expanding Islamic law beyond family law into the criminal domain. In Niger, on the other hand, multiple systems of law co-exist uneasily, without any effective hierarchy or definitive conclusion to legal disputes carried into different legal domains. In all three cases the state does not have the capacity to effectively enforce a single coherent legal system, nor does it succeed in controlling the justice that so commonly occurs in extra-legal settings. Throughout West Africa legal reform must contend with the dual problems of weak state capacity to impose a unified legal system and of the vigilantism of pressure groups that may have limited mastery of the Islamic juridical tradition in an atmosphere that is nevertheless heavy with the rhetoric of a return to Islamic purity. Cet article expose les différentes approches de trois états ouest-africains que sont le Niger, le Sénégal et le Nigeria en vue de concilier les divers systèmes juridiques (islamique, occidental, militaire) dont ils ont hérité en tant qu’états ostensiblement la ques dans des régions majoritairement musulmanes. Si le Sénégal a adopté un Code de la famille qui para t modifier et réglementer les dites injustices du droit musulman dans la vie de famille, un certain nombre d'états du Nigéria sont allés en sens inverse, en élargissant le droit islamique au-delà du droit de la famille en l’étendant au domaine pénal. Au Niger, d’autre part, plusieurs systèmes de droit coexistent de manière précaire, sans hiérarchie réelle et sans aboutir à la résolution définitive des conflits juridiques. Dans les trois cas, l’état n’a ni la capacité d’appliquer efficacement un système juridique unitaire et cohérent, ni ne réussit à contr ler la justice qui a lieu si souvent dans des milieux extra-légaux. Partout en Afrique de l’Ouest, les partisans des réformes juridiques affrontent deux épreuves : la faible capacité de l’état à imposer un système juridique unitaire, et la coercition des groupes de pression qui ma trisent mal la tradition juridique islamique dans une atmosphère chargée d’un discours sur le retour à une cer
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