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David W. Johnson

Bio: David W. Johnson is an academic researcher from University of Queensland. The author has contributed to research in topics: Peritoneal dialysis & Kidney disease. The author has an hindex of 160, co-authored 2714 publications receiving 140778 citations. Previous affiliations of David W. Johnson include Minnesota Department of Transportation & Open University.


Papers
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Journal ArticleDOI
01 Aug 1990-Virology
TL;DR: Results support the conclusion that both gE and gI are required for full Fc receptor activity, although gE alone can bind IgG to a lesser extent.

58 citations

Journal ArticleDOI
TL;DR: Measurements of the spatial structure of the transport coefficients of He²+ on the Tokamak Fusion Test Reactor is reported, showing that the helium diffusivity is on the order of the ion momentum and thermaldiffusivity and is greater than the electron thermal diffuivity.
Abstract: Measurements of the spatial structure of the transport coefficients of He²+ on the Tokamak Fusion Test Reactor is reported. He²+ profiles were measured using charge-exchange spectroscopy after a helium puff into corotating L-mode plasmas. Modeling shows that the He²+ diffusivity is about 10 m²/s near the plasma edge and drops to below 1 m²/s inside of the q =1 surface. The convective velocity ranges from 1–3 m/s near q =1 to 20–40 m/s near the edge. The helium diffusivity is on the order of the ion momentum and thermal diffusivity and is greater than the electron thermal diffusivity.

58 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined the effects of positive interdependence vs. no-interdependence on students' academic achievement and found that students in the positive-interdependent condition engaged in significantly more interaction and more promotive interaction while taking the electronic quizzes and achieved higher scores on the subsequent examinations taken individually.
Abstract: The authors examined the effects of positive interdependence vs. no interdependence on students' academic achievement. Participants included 151 U.S. college students who took weekly electronic quizzes on which they could interact with group mates in a chat room. In the positive interdependence condition, 1 member was chosen at random, and his or her score was given to all members of the group. In the no-interdependence condition, each group member received his or her own score on each quiz. Achievement was measured by biweekly examinations that students took by themselves and that produced their own independent scores. Students in the positive-interdependence condition engaged in significantly more interaction and more promotive interaction while taking the electronic quizzes and achieved higher scores on the subsequent examinations taken individually.

58 citations

Journal ArticleDOI
TL;DR: This paper found that the similarity of another person's attitudes has a positive effect on a subject's attraction toward the other only when the subject did not expect to interact with the other in a goal interdependent situation.

58 citations

Journal ArticleDOI
TL;DR: Elevated CO2 had no effect on soil pCO2 or calculated soil respiration at any time, further suggesting that plant rather than microbial uptake was the primary factor responsible for the observed changes in N and P availability with elevated CO2.
Abstract: The results of a 3-yr study on the effects of elevated CO 2 on soil N and P, soil pCO 2 , and calculated CO 2 efflux in a fire-regenerated Florida scrub oak ecosystem are summarized. We hypothesized that elevated CO 2 would cause (i) increases in soil pCO 2 and soil respiration and (ii) reduced levels ofsoil-available N and P. The effects of elevated CO 2 on soil N availability differed according to the method used. Results of resin lysimeter collections and anion exchange membrane tests in the field showed reduced NO 3 in soils in Years 1 and 3. On the other hand, re-analysis of homogenized, buried soil bags after 1 yr suggested a relative increase in N availability (lower C to N ratio) under elevated CO 2 . In the case of P, the buried bags and membranes suggested a negative effect of CO 2 on P during the first year; this faded over time, however, as P availability declined overall, probably in response to P uptake. Elevated CO 2 had no effect on soil pCO 2 or calculated soil respiration at any time, further suggesting that plant rather than microbial uptake was the primary factor responsible for the observed changes in N and P availability with elevated CO 2 .

58 citations


Cited by
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Journal ArticleDOI
Eric S. Lander1, Lauren Linton1, Bruce W. Birren1, Chad Nusbaum1  +245 moreInstitutions (29)
15 Feb 2001-Nature
TL;DR: The results of an international collaboration to produce and make freely available a draft sequence of the human genome are reported and an initial analysis is presented, describing some of the insights that can be gleaned from the sequence.
Abstract: The human genome holds an extraordinary trove of information about human development, physiology, medicine and evolution. Here we report the results of an international collaboration to produce and make freely available a draft sequence of the human genome. We also present an initial analysis of the data, describing some of the insights that can be gleaned from the sequence.

22,269 citations

28 Jul 2005
TL;DR: PfPMP1)与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作�ly.
Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1(PfPMP1)与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员,通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

18,940 citations

Book ChapterDOI
09 Jan 2004
TL;DR: A theory of intergroup conflict and some preliminary data relating to the theory is presented in this article. But the analysis is limited to the case where the salient dimensions of the intergroup differentiation are those involving scarce resources.
Abstract: This chapter presents an outline of a theory of intergroup conflict and some preliminary data relating to the theory. Much of the work on the social psychology of intergroup relations has focused on patterns of individual prejudices and discrimination and on the motivational sequences of interpersonal interaction. The intensity of explicit intergroup conflicts of interests is closely related in human cultures to the degree of opprobrium attached to the notion of "renegade" or "traitor." The basic and highly reliable finding is that the trivial, ad hoc intergroup categorization leads to in-group favoritism and discrimination against the out-group. Many orthodox definitions of "social groups" are unduly restrictive when applied to the context of intergroup relations. The equation of social competition and intergroup conflict rests on the assumptions concerning an "ideal type" of social stratification in which the salient dimensions of intergroup differentiation are those involving scarce resources.

14,812 citations

Journal ArticleDOI
TL;DR: In this paper, Imagined communities: Reflections on the origin and spread of nationalism are discussed. And the history of European ideas: Vol. 21, No. 5, pp. 721-722.

13,842 citations

Journal ArticleDOI
TL;DR: Reading a book as this basics of qualitative research grounded theory procedures and techniques and other references can enrich your life quality.

13,415 citations