743 research outputs found

    Crassulacean acid metabolism in the Gesneriaceae

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    The occurrence of the Crassulacean acid metabolism (CAM) was studied in four epiphytic species of the Gesneriaceae: two neotropical species, Codonanthe crassifolia and Columnea linearis, and two paleotropical species, Aoschynanthus pulcher and Saintpaulia ionantha. Gas exchange parameters, enzymology, and leaf anatomy, including mesophyll succulence and rel­ ative percent of the mesophyll volume occupied by airspace, were studied for each species. Codonanthe crassifolia was the only species to show nocturnal CO2 uptake and a diurnal organic acid fluctuation. According to these results, Codonanthe crassifolia shows CAM-cycling under well-watered conditions and when subjected to drought, it switches to CAM-idling. Other characteristics, such as leaf anatomy, mesophyll succulence, and PEP carboxylase and NADP malic enzyme activity, indicate attributes of the CAM pathway. All other species tested showed C3 photosynthesis. The most C3-like species is Columnea linearis, according to the criteria tested in this investigation. The other two species show mesophyll succulence and relative percent of the leaf volume occupied by airspace within the CAM range, but no other characters of the CAM pathway. The leaf structure of certain genera of the Gesneriaceae and of the genus Peperomia in the Piperaceae are similar, both having an upper succulent, multiple epidermis, a medium palisade of one or a few cell layers, and a lower, succulent spongy parenchyma not too unlike CAM photosynthetic tissue. We report ecophysiological similarities between these two distantly related families. Thus, the occurrence of CAM-cycling may be more common among epiphytic species than is currently known

    One method of promoting continuity of nursing care to the maternity patient.

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    Thesis (M.S.)--Boston Universit

    Kinetic Meditative Experimental Drawing

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    This lesson for high school students provides an opportunity to make a work of art without a preconceived plan by using their bodies and spontaneous movements to control mark-making. Symmetry is explored along with the art of Heather Hansen and Tony Orrico.https://digitalcommons.kennesaw.edu/zuckermanmuseum_p12/1008/thumbnail.jp

    Gait in Parkinson’s disease: a visuo-cognitive challenge

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    Vision and cognition have both been related to gait impairment in Parkinson’s disease (PD) through separate strands of research. The cumulative and interactive effect of both (which we term visuo-cognition) has not been previously investigated and little is known about the influence of cognition on vision with respect to gait. Understanding the role of vision, cognition and visuo-cognition in gait in PD is critical for data interpretation and to infer and test underlying mechanisms. The purpose of this comprehensive narrative review was to examine the interdependent and interactive role of cognition and vision in gait in PD and older adults. Evidence from a broad range of research disciplines was reviewed and summarised. A key finding was that attention appears to play a pivotal role in mediating gait, cognition and vision, and should be considered emphatically in future research in this field

    Walking the Path of the Law: How Law Graduates Navigate Career Choices and Tolerate Jobs that Fail to Meet Expectations

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    If one talks to law students about the their career expectations, one is likely to hear a common story: when the student graduates, she plans to go into private practice, or possibly take a government job, or even less probably, take a public interest job. The students think their initial choices of legal jobs set them on a career trajectory that is fairly immutable. However, the students\u27 beliefs may not be based on actual information about how lawyers choose their career paths. This empirical study of 2800 lawyers who graduated from law school between 1970 and 1999 analyzes whether lawyers have standard career trajectories. The study considers whether gender or time of graduation affects career choices. The study also examines whether there are dominant reasons that lawyers give for changing jobs. Finally, the study considers whether lawyers are satisfied with their jobs by using a unique measure that gauges the level of congruency between lawyers\u27 hopes for the kind of job they have with their actual experiences of a job. Consistent with other empirical studies of lawyers\u27 career paths, this study finds that a large number of lawyers start their careers in private practice, and that most lawyers will change jobs a couple of times, with most staying within the same practice setting (i.e., moving from private firm to private firm.) However, this study challenges other well-held notions of career trajectories. Notably, this study does not find that women leave the law more than men, nor that women enter government or public interest work more than men. Further, the study documents that women and men both experience conflict between the demands of their jobs and their responsibilities outside work, and that both are equally concerned about that conflict. In other words, male lawyers say work-life balance is as concerning for them as it is for female lawyers. Finally, the study refutes the widely-held belief that lawyers do not like their jobs. The study provides law students and the profession with an important reminder that there is not a right career path, nor an immutable one, and that much of the practice of law is engaging and rewarding

    Extended fisheries jurisdiction and the development problems of small island countries.

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    Thesis. 1979. M.C.P.--Massachusetts Institute of Technology. Dept. of Urban Studies and Planning.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ROTCH.Bibliography: leaves 120-123.M.C.P

    Vision, visuo-cognition and postural control in Parkinson's disease: An associative pilot study

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    Introduction Impaired postural control (PC) is common in patients with Parkinson's disease (PD) and is a major contributor to falls, with significant consequences. Mechanisms underpinning PC are complex and include motor and non-motor features. Research has focused predominantly on motor and sensory inputs. Vision and visuo-cognitive function are also integral to PC but have largely been ignored to date. The aim of this observational cross-sectional pilot study was to explore the relationship of vision and visuo-cognition with PC in PD. Methods Twelve people with PD and ten age-matched healthy controls (HC) underwent detailed assessments for vision, visuo-cognition and postural control. Vision assessments included visual acuity and contrast sensitivity. Visuo-cognition was measured by visuo-perception (object identification), visuo-construction (ability to copy a figure) and visuo-spatial ability (judge distances and location of object within environment). PC was measured by an accelerometer for a range of outcomes during a 2-min static stance. Spearman's correlations identified significant associations. Results Contrast sensitivity, visuo-spatial ability and postural control (ellipsis) were significantly impaired in PD (p = 0.017; p = 0.001; and p = 0.017, respectively). For PD only, significant correlations were found for higher visuo-spatial function and larger ellipsis (r = 0.64; p = 0.024) and impaired attention and reduced visuo-spatial function (r = −0.62; p = 0.028). Conclusions Visuo-spatial ability is associated with PC deficit in PD, but in an unexpected direction. This suggests a non-linear pattern of response. Further research is required to examine this novel and important finding

    ‘Why has my world become more confusing than it used to be?’ Professional doctoral students reflect on the development of their identity

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    This article reports on research into the experience of professional doctoral students and is written by the students themselves. We, the authors, are currently studying for the Doctorate in Education at the University of Manchester, UK. We place our work in the context of recent empirical research into the development of doctoral student identity, noting that these literatures are usually authored by programme directors and supervisors. Using a theoretical approach based on the work of Etienne Wenger, we examine how the aims and curriculum of our programme interplay with our professional learning. In interviews with our cohort of students, we explore the complexity and non-linearity of learning. We do not find a simple progression from practitioner to researcher; rather, we find a fluid and complex relationship between those two identities. We consider the extent to which Wenger’s modes of identification are a useful conceptual tool for understanding this interplay and for theorising about our findings. We conclude that there is further scope for the development of our theoretical framework by drawing on other scholarly work on identity development and reflexivit
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