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Open Access Publications from the University of California

Scholarly Works (51285 results, showing first 10000)

  • Article
Western Journal of Emergency Medicine: Integrating Emergency Care with Population Health, Volume 16, Issue 4.1 (2015)
    Cover page: Do You Come Here Often? “Speed-Advising” for Medical Students Matching in Emergency MedicineCreative Commons 'BY' version 4.0 license
    • Article
    • Peer Reviewed
    UC San Diego Previously Published Works (2010)
    Within boulder forming corals, fixation of dissolved inorganic carbon is performed by symbiotic dinoflagellates within the coral tissue and, to a lesser extent, endolithic algae within the coral skeleton. Endolithic algae produce distinctive green bands in the coral skeleton, and their origin may be related to periods of coral bleaching due to complete loss of dinoflagellate symbionts or “paling” in which symbiont populations are patchily reduced in coral tissue. Stable carbon isotopes were analyzed in coral skeletons across a known bleaching event and 12 blooms of endolithic algae to determine whether either of these types of changes in photosynthesis had a clear isotopic signature. Stable carbon isotopes tended to be enriched in the coral skeleton during the initiation of endolith blooms, consistent with enhanced photosynthesis by endoliths. In contrast, there were no consistent δ13C patterns directly associated with bleaching, suggesting that there is no unique isotopic signature of bleaching. On the other hand, isotopic values after bleaching were lighter 92% of the time when compared to the bleaching interval. This marked drop in skeletal δ13C may reflect increased kinetic fractionation and slow symbiont recolonization for several years after bleaching.
      Cover page: Stable isotopic records of bleaching and endolithic algae blooms in the skeleton of the boulder forming coral Montastraea faveolata
      • Article
      Western Journal of Emergency Medicine: Integrating Emergency Care with Population Health, Volume 16, Issue 4.1 (2015)
        Cover page: An Expert Educator Teaching Shift Used as a Method to Assess Milestones in StudentsCreative Commons 'BY' version 4.0 license
        • Article
        LBL Publications (1982)
          Cover page: Component Leakage Testing in Residential Buildings
          • Article
          • Peer Reviewed
          UC Davis Previously Published Works (2004)

          Accessory gland proteins are a major component of Drosophila seminal fluid. These proteins have a variety of functions and may be subject to sexual selection and/or antagonistic evolution between the sexes. Most population genetic data from these proteins are from D. melanogaster and D. sinulans. Here, we extend the population genetic analysis of Acp genes to the other simulans complex species, D. mauritiana. and D. sechellia. We sequenced population samples of seven Acp's from D. mauritiana, D. sechellia, and D. simulans. We investigated the population genetics of these genes on individual simulans complex lineages and compared Acp polymorphism and divergence to polymorphism and divergence from a set of non-Acp loci in the same species. Polymorphism and divergence data from the simulans complex revealed little evidence for adaptive protein evolution at individual loci. However, we observed a dramatically inflated index of dispersion for amino acid Substitutions in the simulans complex at Acp genes, but not at non-Acp genes. This pattern of episodic bursts of protein evolution in Acp's provides the strongest evidence to date that the Population genetic mechanisms driving Acp divergence are different from the mechanisms driving evolution at most Drosophila genes.

            Cover page: Molecular population genetics of male accessory gland proteins in the Drosophila simulans complex
            • Article
            LBL Publications (1971)
              Cover page: K-Electron Binding Energy Shifts in Fluorinated Methanes and Benzenes: Comparison of a CNDO Potential Model with ExperimentCreative Commons 'BY' version 4.0 license
              • Article
              • Peer Reviewed
              UC Santa Barbara Previously Published Works (2005)

              This paper proposes several definitions of "norm-observability" for nonlinear systems and explores relationships among them. These observability properties involve the existence of a bound on the norm of the state in terms of the norms of the output and the input on some time interval. A Lyapunov-like sufficient condition for norm-observability is also obtained. As an application, we prove several variants of LaSalle's stability theorem for switched nonlinear systems. These results are demonstrated to be useful for control design in the presence of switching as well as for developing stability results of Popov type for switched feedback systems.

                Cover page: Nonlinear norm-observability notions and stability of switched systems
                • Article
                • Peer Reviewed
                UCLA Previously Published Works (2019)
                A recent article in the journal reported analyses of KDQOL-36™ survey data collected from 240,343 adults (330,412 surveys) dialyzed at a large dialysis organization in the United States during 2014-2016. The authors concluded that the KDQOL-36™ Symptoms and Problems of Kidney Disease scale had the highest mean score of the KDQOL-36™ scales. We note that this inference was erroneous because the scales are not scored on the same numeric scale. In addition, the authors found that responses to a general health perceptions item ("In general, would you say your health is excellent, very good, good, fair, or poor") was not significantly associated with any of the 5 KDQOL-36 scale scores. In contrast, we find significant and noteworthy correlations in two other datasets. These analytic issues call into question the accuracy and validity of the conclusions of this paper.
                  Cover page: Problems with analyses and interpretation of data in “use of the KDQOL-36™ for assessment of health-related quality of life among dialysis patients in the United States”
                  • Article
                  LBL Publications (1982)
                    Cover page: Component Leakage Testing in Residential BuildingsCreative Commons 'BY' version 4.0 license
                    • Article
                    • Peer Reviewed
                    UC Irvine Previously Published Works (2014)
                    Visual signaling in animals can serve many uses, including predator deterrence and mate attraction. In many cases, signals used to advertise unprofitability to predators are also used for intraspecific communication. Although aposematism and mate choice are significant forces driving the evolution of many animal phenotypes, the interplay between relevant visual signals remains little explored. Here, we address this question in the aposematic passion-vine butterfly Heliconius erato by using color- and pattern-manipulated models to test the contributions of different visual features to both mate choice and warning coloration. We found that the relative effectiveness of a model at escaping predation was correlated with its effectiveness at inducing mating behavior, and in both cases wing color was more predictive of presumptive fitness benefits than wing pattern. Overall, however, a combination of the natural (local) color and pattern was most successful for both predator deterrence and mate attraction. By exploring the relative contributions of color versus pattern composition in predation and mate preference studies, we have shown how both natural and sexual selection may work in parallel to drive the evolution of specific animal color patterns.
                      Cover page: Warning signals are seductive: Relative contributions of color and pattern to predator avoidance and mate attraction in Heliconius butterfliesCreative Commons 'BY' version 4.0 license
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