196,040 research outputs found
Remotely-sensed phenology of Italian forests. Going beyond the species
No full textRemotely sensed observations of seasonal greenness dynamics represent a valuable tool for studying vegetation phenology at regional and ecosystem-level scales. We investigated the seasonal variability of forests in Italy, examining the different mechanisms of phenological response to biophysical drivers. For each point of the Italian National Forests Inventory, we processed a multitemporal profile of the MODIS Enhanced Vegetation Index. Then we applied a multivariate approach for the purpose of (i) classifying the Italian forests into phenological clusters (i.e. pheno-clusters), (ii) identifying the main phenological characteristics and the forest compositions of each pheno-cluster and (iii) exploring the role of climate and physiographic variables in the phenological timing of each cluster. Results identified four pheno-clusters, following a clear elevation gradient and a distinct separation along the Mediterranean-to-temperate climatic transition of Italy. The “High-elevation coniferous” and the “High elevation deciduous” resulted mainly affected by elevation, with the former characterized by low annual productivity and the latter by high seasonality. To the contrary, the “Low elevation deciduous” showed to be mostly associated to moderate climate conditions and a prolonged growing season. Finally, summer drought was the main driving variable for the “Mediterranean evergreen”, characterized by low seasonality. The discrimination of vegetation phenology types can provide valuable information useful as a baseline framework for further studies on forests ecosystem and for management strategies
Outcomes associated with fetal hepatobiliary cysts: a systematic review and meta-analysis
No full textTo explore the outcome of fetal hepatobiliary cysts
P0428 Cardiac Sympathetic and Parasympathetic Balance Before and After Gluten Free Diet in Children With Celiac Disease
No full textCeliac disease (CD) is often associated with other autoimmune disorders such as IDDM, autoimmune thyroiditis, rheumatoid arthritis, idiopathic dilated cardiomyopathy. Recently, an increased prevalence of antibodies versus neurons of central and enteric autonomic nervous system has been reported in celiac patients affected by various neurological disorders with improvement of neurological sign in a high percentage of patients after gluten free diet (GFD). We wished to evaluate the cardiac sympathetic and parasympathetic balance (detected with time and frequency analysis of Heart Rate Variability [HRV]) in untreated CD children. Data were compared with healthy subjects and the same patients after GFD. Methods: 10 children with CD (mean age 8.4±3.9 years) were studied at diagnosis and after six months of GFD. The control group consisted of 10 healthy age, sex and weight matched children. Standard 12-lead electrocardiograms (ECG) and ECG monitoring in two leads for HRV evaluation were performed in all patients at diagnosis and after six months of GFD, under standardized experimental conditions. The analysis of the normal beat to beat series (612 interval) and the analysis of variability of R-R interval were performed in time and in frequency domain with a commercially available software (Norav System). All recordings were also visually examined and manually revised to verify beat classification. The following indexes were calculated in time domain: R-R mean length SDNN (standard deviation of all normal RR intervals), rMSSD (square root of the mean of the sum of the squares of differences between adjacent intervals), triangular Index. The following indexes were calculated for spectral analysis: low frequency (LF) power (0.04 to 0.15 Hz) in ms2, high frequency (HF) and LF/HF ratio. Ultra low frequency (ULF) and very low frequency (VLF) were not calculated because they reflect circadian and other long-term variations in heart rhythm. Statistics results were analysed by the Student's t Test
Pp Nutritional Therapy Alone With A Polymeric Diet (Modulen) Is More Effective Than Corticosteroids in Inducing Healing of Intestinal Mucosal Lesions in Active Crohn's Disease
No full textDr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Characterizing the climatic niche of mast seeding in beech: Evidences of trade-offs between vegetation growth and seed production
No full textMasting is a complex mechanism which is mainly driven by a combination of internal plant resources and climatic conditions. While the driving role of climate in masting is being intensively studied, the interplay among climate, seed production, vegetation growth and phenology still needs further investigation. The objectives of this study were to identify the climatic determinants of different levels of seed production and of NDVI-based vegetation growth and phenology in European beech, and to evaluate if exists a trade-off between these two plant processes. To answer these questions, we used a 25-year-long dataset of beech seed production. We exploited the concept of ecological niche assuming that a mast year can be modeled like a species with variable preferences for different resources, which are the underlying annual climatic conditions; we performed an Ecological Niche Factor Analysis (ENFA), a presence-only modeling tool conventionally used in zoology and botany, and used seasonal (spring, summer, autumn) Standardized Precipitation-Evaporation Index (SPEI) observations, considering the current year (y−0), and up to one (y−1) and two (y−2) years before the masting event. For analyzing the role of vegetation growth and phenology, we used seasonal Normalized Difference Vegetation Index (NDVI) values and associated NDVI-based phenological metrics derived from Landsat imagery. Results indicated the driving role of climate for masting, especially in VHSP years. A moist summer and dry spring at y−2 and a dry summer at y−1 represented the main driving climatic conditions for masting; while a moist spring during the observation year represented the key condition for triggering higher intensities of seed production. Summer NDVI at y−0 and y−1 represented the variables discriminating best between masting and non-masting years and resulted as driven by opposite summer climatic conditions than seed production, thus indicating a trade-off between seed production and vegetation phenology. We concluded that reproduction and vegetation growth act as two different climate-dependent plant responses in beech, in a way that certain conditions through the years promote mast seeding and the opposite conditions favor vegetation growth. The understanding of climate-growth-masting relationships represents indispensable knowledge for providing a holistic view of masting mechanisms and developing adaptive forest management strategies in this species
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Successful treatment of pyoderma gangrenosum with low concentration topical tacrolimus in a girl with ulcerative colitis in remission
No full textDispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
- …
