scholarly journals A primer on tissue pH and local anesthetic potency

2020 ◽  
Vol 44 (3) ◽  
pp. 305-308
Author(s):  
Rebecca L. E. Pope ◽  
Angus M. Brown

The relationship between pH, p Ka, and degree of local anesthetic ionization is quantified by the Henderson-Hasselbalch equation. As presented in standard textbooks, the effect of pH on the degree of ionization of any particular local anesthetic is not immediately clear due to the x-axis displaying pH − p Ka, which requires conversion to pH, based on the p Ka for each local anesthetic, a complex process. We present a graphical solution that clarifies the interrelationships between pH, p Ka, and degree of ionization by plotting p Ka on the x-axis versus the percentage of unionized local anesthetic on the y-axis. The vertical intercept from the x-axis to the pH curves allows rapid and accurate estimation of the degree of ionization of any local anesthetic of known p Ka.

2021 ◽  
pp. 019394592110029
Author(s):  
Nisreen Alnuaimi ◽  
Audrey Tluczek

There is no current theory that explains the process of a fathers’ bonding with their infants born prematurely. Through meta-synthesis of 19 qualitative studies, we developed a conceptual framework to illustrate how fathers perceive the relationship with their premature infant formed over the first 18 months of life. It details the contextual factors that contribute to that process. Findings reveal a complex process comprised of five stages, derived from five core themes and related subthemes. Fathers progress through five sequential stages to establish their role as fathers and form emotional connections with their child. Stages include: (a) feeling alien and lacking emotional connection to the infant, (b) caregiving engagement and claiming the role as a father, (c) claiming the infant as their own, (d) adjusting to having the infant home, and (5) normalizing family life. This conceptual framework can inform future research and clinical interventions designed to foster father−infant bonding.


1989 ◽  
Vol 25 (1) ◽  
pp. 73-78 ◽  
Author(s):  
Adriaan P. Van Den Berg ◽  
Jennifer L. Wike-Hooley ◽  
M. Pia Broekmeyer-Reurink ◽  
Jacoba Van Der Zee ◽  
Hubert S. Reinhold

2019 ◽  
Vol 32 (3-4) ◽  
pp. 361-392 ◽  
Author(s):  
Norig Neveu

Abstract In the Emirate of Transjordan, the interwar period was marked by the emergence of the Melkite Church. Following the Eastern rite and represented by Arab priests, this church appeared to be an asset from a missionary perspective as Arab nationalism was spreading in the Middle East. New parishes and schools were opened. A new Melkite archeparchy was created in the Emirate in 1932. The archbishop, Paul Salman, strengthened the foundation of the church and became a key partner of the government. This article tackles the relationship between Arabisation, nationalisation and territorialisation. It aims to highlight the way the Melkite Church embodied the adaptation strategy of the Congregation for the Oriental Churches in Transjordan. The clergy of this national church was established by mobilising regional and international networks. By considering these clerics as go-between experts, this article aims to decrypt a complex process of territorialisation and transnationalisation of the Melkite Church.


2013 ◽  
Vol 19 (2) ◽  
pp. 7
Author(s):  
Barry King ◽  
Allison Oosterman ◽  
Rosser Johnson

THIS ISSUE of Pacific Journalism Review engages with the theme of the dynamics of fame in a small country. In contrast to the dominant focus in the newly emergent field of Celebrity Studies on celebrity as a global phenomenon, the emphasis in this issue is on the interface between the global and the local; on questions of how the distinctiveness of national and local values fares when caught up in or of willingly imitating the circulation of global fame and influence. Accounts of celebrity often focus on the notion of fetishism—the complex process through which specific idols become objects of veneration on whose admirable or even infamous qualities are presented as emanating from the inner recesses of a luminous personality. The importance of this aspect of celebrity and celebrity worship is not to be denied. But there is another feature of celebrity and stardom that complements and energises the engagement of fans, the interest of the general public and the ambitions of the press and media to create and sustain a market for copy. Celebrities and stars are also totems that create a sense of unity, an imagined community. Individuals express and explore a sense of collective identity, define rituals of belonging, separate themselves from others and manage the relationship between society and nature—in the case of celebrities, the nature in question, is most often, human nature (Rojek, 2012, pp. 130-131). In the case of small countries, like New Zealand, the internal impact of Hollywood stars and celebrities on American popular culture is intensified by the fact that the celebrity system is a totemic import. Patterns and processes for rewarding talent and ascribing fame that have reached the acme of intensity in Global Hollywood, interface with locally situated systems of beliefs and values. This might be seen as a process of colonisation—and to an extent it is.


2007 ◽  
Vol 39 (1) ◽  
pp. 115-133 ◽  
Author(s):  
Nada Polovina ◽  
Jelena Stanisic

Family-school cooperation is a very complex process that can be studied at different levels in a number of different ways. This study has covered only some aspects of cooperation between parents and teachers, based on school documentation of a Belgrade elementary school. The study covered analyses of 60 Attendance Registers pertaining to 60 classes with 1289 students from Grade 1 through Grade 8 during an academic year. The unit of analysis included: parents attendance at PTA meetings and individual meetings between parents and teachers. In addition to the frequency of parents? visits to school, the relationship between such registered parents' visits and overall academic performance, grades in conduct, excused and unexcused absence from classes were also considered. The research findings indicated interference between development factors (attitude change in parent-child relationship and growing-up) and parents? informal "theory of critical grades" i.e. transitional processes in schooling. The findings confirmed that parents? individual visits to school were mainly meant to offer an excuse for the student?s absence from school, while attendance at PTA meetings was linked to poor grades in conduct and missed classes (both excused and unexcused). The findings also showed that parents pursued visiting strategies which were pragmatic, less time-consuming and less emotionally draining ones. The closing part refers to discussions on practical use of the study and possible further research. .


Author(s):  
A. Maiti ◽  
S. Kumar ◽  
V. Tolpekin ◽  
S. Agarwal

Abstract. The PolSAR calibration ensures that the relationship between the SAR observations and the target characteristics on the ground are consistent and resembles the theoretical estimation which in turn improves the overall data quality. Essentially, calibration prevents the propagation of uncertainty into further analysis to characterise the target. In this study, the UAVSAR L-Band data of Rosamond dry lake bed has been calibrated. The calibration of amplitude and phase are carried out with the help of the corner reflector array present in the Rosamond site. The dataset is further calibrated for the crosstalk and channel imbalance using the Quegan’s distortion model. Since the crosstalk distortion model requires an accurate estimation of the covariance matrix, the optimal kernel size for the its computation is selected based on the distortion model behaviour with varying window sizes. Furthermore, the effectiveness of the calibration process has been studied using polarimetric signatures and other statistical measures.


2017 ◽  
Vol 48 (3) ◽  
pp. 616-633 ◽  
Author(s):  
G. Farina ◽  
S. Alvisi ◽  
M. Franchini

This paper presents a procedure for estimating discharge in a river cross-section based on the combined use of dimensionless isovels and point velocity measurements. Specifically, taking the Biot–Savart law on the magnetic field induced by an electric current in a wire as their basis as already done by other researchers, the authors propose a new formulation of the relationship characterizing the effect of the wetted perimeter on the range of velocities in a cross-section in order to take explicit account of roughness, expressed by means of Manning's coefficient. Once appropriately nondimensionalized, the isoeffect contours can be read as dimensionless isovels. Assuming in situ velocity measurements are available, discharge at a cross-section can be computed using two different methods. The proposed procedure was applied to six case studies characterized by river cross-sections which differed greatly from one another. The results show that the two methods proposed for estimating discharge lead to equivalent outcomes, and in all the cases the procedure as a whole enables a sufficiently accurate estimation of discharge, even when it is based on a limited number of velocity measurements or on the measurement of maximum surface-water velocity alone.


Author(s):  
Shaker Ali Al-Mohammadi ◽  
Emira Derbel

Writing is a complex process and used of course for an incalculable range of purposes and audiences. Teaching students to write in their mother tongue is hard, but teaching them to do this in a second or foreign language is even harder. This chapter focuses on the question of audience in teaching and learning writing, arguing that it is vital for students to be aware of an audience that eventually determines what, why, and how they will write. It seeks to provide a thorough understanding of Omani EFL students' conception of audience and their current level of audience awareness and also to explore the relationship between audience awareness and students' performance in composition classes and tests.


Author(s):  
Priyanka Verma ◽  
Monika Gupta ◽  
Shraddha Verma

Background: Accurate estimation of gestational age and fetal wellbeing is mandatory to ensure safe pregnancy and healthy delivery. With recent development in USG, basic scan, Doppler imaging and interventional radiology helped greatly in accurate estimation of gestational age and delivering timely care. The objectives of this study was to determine the USG placental thickness at the level of insertion of cord in antenatal women from gestational age 11 to 40 weeks. To correlate placental thickness with gestational age. To calculate composite gestational age from USG parameters; CRL, BPD, HC, AC, FL. To compare the relationship of menstrual gestational age with placental thickness and composite gestational age separatelyMethods: It is a comparative study of 2 years duration. Total 322 patients were included. Gestational age was determined from LMP. Patient’s routine obstetric USG was done and composite gestational age was calculated from fetal parameters like BPD, HC, AC and FL (CRL in 11 to 14 weeks). At the same time placental thickness was determined at the level of insertion of umbilical cord. The plane of USG image was adjusted so that the thickness measured from cord insertion is perpendicular to the margin of uterine wall.Results: The following parameters were noted: correlation of period of gestation (weeks) with composite gestational age (weeks) correlation of period of gestation (weeks) with gestational age calculated by placental thickness (weeks).Conclusions: Placental thickness can give an estimation of gestational age. The linear correlation and statistical compatibility of placental thickness makes it an alternate parameter for gestational age. Knowledge of correct gestational age helps in delivering proper antenatal care, assessing fetal wellbeing, identifying pathology at the earliest and timely decision of termination and providing safe motherhood.


2015 ◽  
Vol 6 (2) ◽  
pp. 241-260 ◽  
Author(s):  
Aliya Sorgen

AbstractThe integration of refugees/asylum seekers is a complex process that is affected by factors such as reasons for fleeing one’s home country, linguistic proficiency, education, housing issues, and reception from the host community. While past research has focused on these issues, there is a lack of attention on the development of practical and psychological integration skills through participation in a social space ofmutual accommodation(Berry 2005). This article fills this gap by analysing the relationship between mutual accommodation and integration in relation to spaces for language acquisition and the resulting impact of participation. This study illustrates, from the migrant perspective, how language acquisition in terms of resettlement not only focuses on linguistic proficiency but also on how such spaces provide a supportive place of refuge and support. This research underscores a deeper discussion of the migrantnew speakerprofile, providing evidence for ways in which to broaden an understanding of this key shift away from previously held notions of thenativeversusnon-nativeindividual. Ethnographic research was conducted in two UK-based conversation clubs. Data analysis followed Braun and Clarke’s (2006) Thematic Analysis structure.


Sign in / Sign up

Export Citation Format

Share Document