Institution
Colorado Mesa University
Education•Grand Junction, Colorado, United States•
About: Colorado Mesa University is a education organization based out in Grand Junction, Colorado, United States. It is known for research contribution in the topics: Fluvial & Population. The organization has 330 authors who have published 540 publications receiving 19977 citations. The organization is also known as: Colorado Mesa & Mesa State College.
Topics: Fluvial, Population, Creativity, Higher education, Biodiversity
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the authors present a set of guidelines for the selection and interpretation of methods for use by investigators who aim to examine macro-autophagy and related processes, as well as for reviewers who need to provide realistic and reasonable critiques of papers that are focused on these processes.
Abstract: In 2008 we published the first set of guidelines for standardizing research in autophagy. Since then, research on this topic has continued to accelerate, and many new scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Accordingly, it is important to update these guidelines for monitoring autophagy in different organisms. Various reviews have described the range of assays that have been used for this purpose. Nevertheless, there continues to be confusion regarding acceptable methods to measure autophagy, especially in multicellular eukaryotes.
For example, a key point that needs to be emphasized is that there is a difference between measurements that monitor the numbers or volume of autophagic elements (e.g., autophagosomes or autolysosomes) at any stage of the autophagic process versus those that measure flux through the autophagy pathway (i.e., the complete process including the amount and rate of cargo sequestered and degraded). In particular, a block in macroautophagy that results in autophagosome accumulation must be differentiated from stimuli that increase autophagic activity, defined as increased autophagy induction coupled with increased delivery to, and degradation within, lysosomes (in most higher eukaryotes and some protists such as Dictyostelium) or the vacuole (in plants and fungi). In other words, it is especially important that investigators new to the field understand that the appearance of more autophagosomes does not necessarily equate with more autophagy. In fact, in many cases, autophagosomes accumulate because of a block in trafficking to lysosomes without a concomitant change in autophagosome biogenesis, whereas an increase in autolysosomes may reflect a reduction in degradative activity. It is worth emphasizing here that lysosomal digestion is a stage of autophagy and evaluating its competence is a crucial part of the evaluation of autophagic flux, or complete autophagy.
Here, we present a set of guidelines for the selection and interpretation of methods for use by investigators who aim to examine macroautophagy and related processes, as well as for reviewers who need to provide realistic and reasonable critiques of papers that are focused on these processes. These guidelines are not meant to be a formulaic set of rules, because the appropriate assays depend in part on the question being asked and the system being used. In addition, we emphasize that no individual assay is guaranteed to be the most appropriate one in every situation, and we strongly recommend the use of multiple assays to monitor autophagy. Along these lines, because of the potential for pleiotropic effects due to blocking autophagy through genetic manipulation, it is imperative to target by gene knockout or RNA interference more than one autophagy-related protein. In addition, some individual Atg proteins, or groups of proteins, are involved in other cellular pathways implying that not all Atg proteins can be used as a specific marker for an autophagic process. In these guidelines, we consider these various methods of assessing autophagy and what information can, or cannot, be obtained from them. Finally, by discussing the merits and limits of particular assays, we hope to encourage technical innovation in the field.
5,187 citations
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TL;DR: In this article, two studies were conducted to analyze how hope, resilience, optimism, and efficacy individually and as a composite higher-order factor predicted work performance and satisfaction, and the results indicated that the composite factor may be a better predictor of performance than the individual facets.
Abstract: Two studies were conducted to analyze how hope, resilience, optimism, and efficacy individually and as a composite higher-order factor predicted work performance and satisfaction. Results from Study 1 provided psychometric support for a new survey measure designed to assess each of these 4 facets, as well as a composite factor. Study 2 results indicated a significant positive relationship regarding the composite of these 4 facets with performance and satisfaction. Results from Study 2 also indicated that the composite factor may be a better predictor of performance and satisfaction than the 4 individual facets. Limitations and practical implications conclude the article.
3,071 citations
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TL;DR: In this paper, the authors investigated whether the recently emerging core construct of positive psychological capital (consisting of hope, resilience, optimism, and efficiency) plays a role in mediating the effect of supportive organizational climate with employee outcomes.
Abstract: Summary Although the value of a supportive organizational climate has been recognized over the years, there is a need for better understanding of its relationship with employee outcomes. This study investigates whether the recently emerging core construct of positive psychological capital (consistingofhope,resilience,optimism,andefficacy)playsaroleinmediatingtheeffectsofa supportive organizational climate with employee outcomes. Utilizing three diverse samples, results show that employees’ psychological capital is positively related to their performance, satisfaction, and commitment and a supportive climate is related to employees’ satisfaction and commitment. The study’s major hypothesis that employees’ psychological capital mediates the relationship between supportive climate and their performance was also supported. The implications of these findings conclude the article. Copyright # 2008 John Wiley & Sons, Ltd.
1,124 citations
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Wageningen University and Research Centre1, University of Puerto Rico2, University of Alabama3, National Autonomous University of Mexico4, Brown University5, University of Connecticut6, University of São Paulo7, Leipzig University8, Smithsonian Tropical Research Institute9, Federal University of Pernambuco10, Tulane University11, University of Stirling12, Clemson University13, University of Alberta14, National Institute of Amazonian Research15, Colorado Mesa University16, State University of New York at Purchase17, World Agroforestry Centre18, University of Wisconsin-Madison19, Columbia University20, Aarhus University21, University of Minnesota22, University of California, Santa Barbara23, Pedagogical and Technological University of Colombia24, University of Maryland, College Park25, Yale-NUS College26, National University of Singapore27, Puerto Rico Department of Agriculture28, University of Amsterdam29, Museu Paraense Emílio Goeldi30, Louisiana State University31, University of Regina32
TL;DR: A biomass recovery map of Latin America is presented, which illustrates geographical and climatic variation in carbon sequestration potential during forest regrowth and will support policies to minimize forest loss in areas where biomass resilience is naturally low and promote forest regeneration and restoration in humid tropical lowland areas with high biomass resilience.
Abstract: Land-use change occurs nowhere more rapidly than in the tropics, where the imbalance between deforestation and forest regrowth has large consequences for the global carbon cycle. However, considerable uncertainty remains about the rate of biomass recovery in secondary forests, and how these rates are influenced by climate, landscape, and prior land use. Here we analyse aboveground biomass recovery during secondary succession in 45 forest sites and about 1,500 forest plots covering the major environmental gradients in the Neotropics. The studied secondary forests are highly productive and resilient. Aboveground biomass recovery after 20 years was on average 122 megagrams per hectare (Mg ha(-1)), corresponding to a net carbon uptake of 3.05 Mg C ha(-1) yr(-1), 11 times the uptake rate of old-growth forests. Aboveground biomass stocks took a median time of 66 years to recover to 90% of old-growth values. Aboveground biomass recovery after 20 years varied 11.3-fold (from 20 to 225 Mg ha(-1)) across sites, and this recovery increased with water availability (higher local rainfall and lower climatic water deficit). We present a biomass recovery map of Latin America, which illustrates geographical and climatic variation in carbon sequestration potential during forest regrowth. The map will support policies to minimize forest loss in areas where biomass resilience is naturally low (such as seasonally dry forest regions) and promote forest regeneration and restoration in humid tropical lowland areas with high biomass resilience.
724 citations
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Sewanee: The University of the South1, Academy of Sciences of the Czech Republic2, University of Nevada, Reno3, University of Papua New Guinea4, Smithsonian Tropical Research Institute5, University of Utah6, Griffith University7, University of Brasília8, University of Ostrava9, Tulane University10, University of Oxford11, George Washington University12, University of Missouri–St. Louis13, American Museum of Natural History14, Chiba University15, University of Göttingen16, Wesleyan University17, Wright State University18, University of Connecticut19, Colorado Mesa University20, University of Minnesota21
TL;DR: A global dataset is used to investigate host range for over 7,500 insect herbivore species covering a wide taxonomic breadth and interacting with more than 2,000 species of plants in 165 families to ask whether relatively specialized and generalized herbivores represent a dichotomy rather than a continuum from few to many host families and species attacked and whether diet breadth changes with increasing plant species richness toward the tropics.
Abstract: Understanding variation in resource specialization is important for progress on issues that include coevolution, community assembly, ecosystem processes, and the latitudinal gradient of species richness. Herbivorous insects are useful models for studying resource specialization, and the interaction between plants and herbivorous insects is one of the most common and consequential ecological associations on the planet. However, uncertainty persists regarding fundamental features of herbivore diet breadth, including its relationship to latitude and plant species richness. Here, we use a global dataset to investigate host range for over 7,500 insect herbivore species covering a wide taxonomic breadth and interacting with more than 2,000 species of plants in 165 families. We ask whether relatively specialized and generalized herbivores represent a dichotomy rather than a continuum from few to many host families and species attacked and whether diet breadth changes with increasing plant species richness toward the tropics. Across geographic regions and taxonomic subsets of the data, we find that the distribution of diet breadth is fit well by a discrete, truncated Pareto power law characterized by the predominance of specialized herbivores and a long, thin tail of more generalized species. Both the taxonomic and phylogenetic distributions of diet breadth shift globally with latitude, consistent with a higher frequency of specialized insects in tropical regions. We also find that more diverse lineages of plants support assemblages of relatively more specialized herbivores and that the global distribution of plant diversity contributes to but does not fully explain the latitudinal gradient in insect herbivore specialization.
457 citations
Authors
Showing all 331 results
Name | H-index | Papers | Citations |
---|---|---|---|
Pierre Y. Julien | 44 | 226 | 7618 |
Lee A. Dyer | 42 | 139 | 5994 |
Bruce Richardson | 42 | 116 | 6127 |
Deborah K. Letourneau | 40 | 79 | 6431 |
Keah Choon Tan | 39 | 58 | 8635 |
John M. Marshall | 33 | 112 | 3215 |
Joseph Prescott | 28 | 48 | 1909 |
Louis S. Nadelson | 28 | 108 | 2123 |
Samuel E. Lohse | 22 | 27 | 2886 |
Robert D. Walker | 22 | 29 | 3254 |
Timothy W. Hanks | 22 | 61 | 1842 |
Deborah K. Kennard | 21 | 34 | 2394 |
Craig D. Dodson | 19 | 34 | 1270 |
Cassandra R. Fenton | 19 | 28 | 912 |
Robert W. Pettitt | 19 | 28 | 731 |