Motivation For Further Studies Research Articles

Plantas medicinais utilizadas na comunidade caiçara da Praia do Sono, Paraty, Rio de Janeiro, Brasil

A comunidade caiçara da Praia do Sono ainda sustenta hábitos e tradições de antigas gerações, o que foi facilitado pelo difícil acesso a esta praia. O presente trabalho objetiva investigar o conhecimento sobre as plantas medicinais nesta comunidade. Foram realizadas entrevistas com 12 informantes especialistas (6 homens e 6 mulheres). As 89 espécies citadas estão distribuídas em 43 famílias, sendo Lamiaceae e Asteraceae as mais representativas. As indicações terapêuticas das plantas medicinais citadas foram agrupadas em 13 categorias de doenças, seguindo a CID-10, adotada pela OMS. As informações sobre as partes das plantas utilizadas, as indicações de uso e os locais de coleta foram indicados. Dez espécies apresentaram grande versatilidade quanto aos seus usos, com IR>1. Treze espécies, sendo Cecropia pachystachya Trec.; Davilla rugosa Poiret e Trema micrantha (L.) Blume nativas do bioma Mata Atlântica, apresentaram valores de CUPc maior que 50%. Estes resultados servem de estímulo para novos trabalhos nessa área e para futuros estudos sobre os constituintes químicos e as propriedades farmacológicas destas plantas.

How to organize a professional development workshop for high school CS teachers

Students' introduction to the subject of computer science (CS) can have long-lasting effects on their ability and motivation for further study. For that reason, it is particularly important that hi...

Response to “Comment on ‘Resonant dissociative electron transfer of the presolvated electron to CCl4 in liquid: Direct observation and lifetime of the CCl4∗− transition state’ [J. Chem. Phys. 129, 027101 (2008)

In our recent paper [J. Chem. Phys.128, 041102 (2008)], we reported a femtosecond time-resolved laser spectroscopic study of the electron transfer reaction of CCl4 in liquid ethanol. Our results provide direct evidence of the resonant dissociative electron transfer (RDET) of the presolvated electron to CCl4, and indicate that RDET can be an efficient process in an aqueous environment. In a recent Comment, the author argues that the relevance of diethanolamine (DEA) induced destruction of chlorofluorocarbons (CFCs) in the polar stratosphere as a possible pathway for chemical ozone destruction should not be a motivation for further studies of DEA on CFC molecules, as no correlation is observed between polar chemical ozone loss and cosmic ray activity. Here, we show that this claim is misleading: it is made by using inconclusive and ambiguous data while ignoring pronounced and well-documented data.

Resistance is skin‐deep: innate immunity may help amphibians to survive a deadly fungus

Resistance is skin‐deep: innate immunity may help amphibians to survive a deadly fungus

Early clerkships

Background: Early clinical experience is being introduced in innovative, vertically integrated undergraduate medical curricula. While in many cases, this early clinical experience is limited to the presence of patients during lectures, in Utrecht students gain ‘hands on’ experience of daily clinical practice during 6-week clerkships. We studied students’ and teachers’ opinions of these full clerkships in the third year of a medical course.Methods: All 238 clinical teachers and 89 students involved in the 2003/2004 third year clerkships of the new Utrecht medical curriculum were asked to fill in a 16-item questionnaire about background knowledge, clinical skills, communication skills, and readiness for clerkships. Answers were given on a 5-point Likert scale. Response was 61%.Results: Both students and clinical teachers answered all statements positively (score > 3.00), although some statements were awarded higher scores by students than teachers. In conclusion, students and teachers appear to appreciate clerkships early in the curriculum.Conclusions: Less background knowledge and a lower age than is usual for the more traditional (later) clerkships do not appear to hinder successful completion of an early clerkship. Indeed, early clerkships have several advantages, such as early observation of the future profession, increased motivation for further study, contextual learning, and improvement of clinical skills.

Close clustering of anthers and stigma in Ipomoea hederacea enhances prezygotic isolation from Ipomoea purpurea

Theory predicts that, for taxa that are already substantially postzygotically isolated but for which hybrid mating is still costly, enhanced prezygotic isolation will be favored. Here, we tested this hypothesis by examining the potential contribution of one particular floral trait, herkogamy, to prezygotic isolation between two species of morning glory, Ipomoea hederacea and Ipomoea purpurea. This trait was experimentally manipulated to determine whether it is a likely prezygotic isolating barrier in naturally pollinated arrays in the field. Emasculated I. hederacea flowers set significantly fewer seeds than did control flowers, indicating that clustering of anthers and stigma in I. hederacea enhances prezygotic isolation from I. purpurea. We hypothesize that this occurs through some combination of mechanical protection and increased self-pollination, with the effect of mechanical protection estimated to be 30% greater than the effect of increased selfing. Our results identify stigma-anther proximity as a likely prezygotic isolating barrier and target of selection in the presence of heterospecific pollen flow, and provide motivation for further study of the role of floral morphology in reproductive isolation in this system.

The maxi K+ channel of human myometrium reveals a split personality

The maxi K⁺ channel of human myometrium reveals a split personality

The viscoelastic compression behavior of liquid composite molding preforms

The compressive deformation of reinforcements is an important consideration for many composites manufacturing processes. The apparent viscoelastic behavior of three common Liquid Composite Molding reinforcements has been studied, and the implications for modeling mold filling processes discussed. Though no resin was present, these fibrous structures have displayed complex time-dependent response, including loading hysteresis, stress relaxation, and strain rate dependent loading behavior. Stress relaxations have been observed to be as high as 64% of the peak stress, with the magnitude of relaxation being dependent on the preform fiber volume fraction. Increasing peak stresses are generated with faster strain rates, and two of the materials studied displayed stress relaxation sensitive to the initial strain rate. Two mold filling experiments are also presented, demonstrating the significant influence of preform viscoelasticity, and providing motivation for further study of these effects.

Seismic Testing of Two-Story Woodframe House: Influence of Wall Finish Materials

A two-story, single-family woodframe house, designed according to current engineered code seismic design requirements, was tested on a uniaxial shake table. The main objectives of this experimental study were to determine the dynamic characteristics and the seismic performance of the test structure under various base input intensities representative of both ordinary and near-field ground motions in southern California. The structure was tested with and without interior (gypsum wall board) and exterior (stucco) wall finish materials. The test results revealed good performance of the engineered woodframe structure. Wall finish materials are usually considered in design as nonstructural elements. However, the structure incorporating wall finish materials exhibited a substantial increase in its lateral stiffness and a dramatic reduction in its seismic displacement response. Furthermore, the seismic acceleration response of the structure was only moderately increased by the presence of wall finish materials. These shake table test results provide the motivation for further studies on the evaluation of the long-term effectiveness of wall finish materials as potential structural components of lateral load-resisting systems of woodframe structures.

ClC chloride channels.

Chloride-conducting ion channels of the ClC family are emerging as critical contributors to a host of biological processes. These polytopic membrane proteins form aqueous pathways through which anions are selectively allowed to pass down their concentration gradients. The ClCs are found in nearly all organisms, with members in every mammalian tissue, yet relatively little is known about their mechanism or regulation. It is clear, however, that they are fundamentally different in molecular construction and mechanism from the well-known potassium-, sodium-, and calcium-selective channels. The medical importance of ClC channels - four inherited diseases have been blamed on familial ClC dysfunction to date - highlights their diverse physiological functions and provides strong motivation for further study.

Future studies of brown dwarfs from space

Current understanding of brown dwarfs is summarized and motivation for further studies is described. The potential of the space missions, IRIS and SIRTF, in brown dwarf detection is discussed in contrast to what can be done from the ground. Observations of brown dwarf companions and giant planets by space telescopes and interferometers are also considered. Space missions are capable of detecting many cool/cold brown dwarfs, while ground based searches are sensitive only to warm and cool brown dwarfs.

Strong Electroweak Phase Transition up tomH∼105GeV

Non-perturbative lattice simulations have shown that there is no electroweak phase transition in the Standard Model for the allowed Higgs masses, m_H \gsim 75 GeV. In the Minimal Supersymmetric Standard Model, in contrast, it has been proposed that the transition should exist and even be strong enough for baryogenesis up to m_H ~ 105 GeV, provided that the lightest stop mass is in the range 100...160 GeV. However, this prediction is based on perturbation theory, and suffers from a noticeable gauge parameter and renormalization scale dependence. We have performed large-scale lattice Monte Carlo simulations of the MSSM electroweak phase transition. Extrapolating the results to the infinite volume and continuum limits, we find that the transition is in fact stronger than indicated by 2-loop perturbation theory. This guarantees that the perturbative Higgs mass bound m_H ~ 105 GeV is a conservative one, allows slightly larger stop masses (up to ~ 165 GeV), and provides a strong motivation for further studies of MSSM electroweak baryogenesis.

Impulsive control in management: Prospects and applications

An outline of impulsive control and its applications in management is reviewed. Conditions for optimal impulsive controls when the dynamic process is given by a stochastic differential equation with Wiener and jump processes are given. Applications to inventory control, capacity expansion, vehicle dispatching, maintenance-replacement-inspection, and pricing problems are formulated, and optimality conditions found. Although there are many other applications that can be outlined, these provide some motivation for further study in this emerging field.