Institution
University of Gothenburg
Education•Gothenburg, Sweden•
About: University of Gothenburg is a education organization based out in Gothenburg, Sweden. It is known for research contribution in the topics: Population & Health care. The organization has 23855 authors who have published 65241 publications receiving 2606327 citations. The organization is also known as: Göteborg University & Gothenburg University.
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TL;DR: The results suggest that the Rubiaceae originated in the Paleotropics and used the boreotropical connection to reach South America, and the biogeographic patterns found corroborate the existence of a long-lasting dispersal barrier between the Northern and Central Andes, the “Western Andean Portal.”
Abstract: Recent phylogenetic studies have revealed the major role played by the uplift of the Andes in the extraordinary diversification of the Neotropical flora. These studies, however, have typically considered the Andean uplift as a single, time-limited event fostering the evolution of highland elements. This contrasts with geological reconstructions indicating that the uplift occurred in discrete periods from west to east and that it affected different regions at different times. We introduce an approach for integrating Andean tectonics with biogeographic reconstructions of Neotropical plants, using the coffee family (Rubiaceae) as a model group. The distribution of this family spans highland and montane habitats as well as tropical lowlands of Central and South America, thus offering a unique opportunity to study the influence of the Andean uplift on the entire Neotropical flora. Our results suggest that the Rubiaceae originated in the Paleotropics and used the boreotropical connection to reach South America. The biogeographic patterns found corroborate the existence of a long-lasting dispersal barrier between the Northern and Central Andes, the “Western Andean Portal.” The uplift of the Eastern Cordillera ended this barrier, allowing dispersal of boreotropical lineages to the South, but gave rise to a huge wetland system (“Lake Pebas”) in western Amazonia that prevented in situ speciation and floristic dispersal between the Andes and Amazonia for at least 6 million years. Here, we provide evidence of these events in plants.
561 citations
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TL;DR: The pharmacological prevention of acellular capillaries without the rescue of pericyte loss in experimental diabetic retinopathy suggests that the endothelium is the primary therapeutic target.
Abstract: Pericytes provide vascular stability and control endothelial proliferation. Pericyte loss, microaneurysms, and acellular capillaries are characteristic for the diabetic retina. Platelet-derived growth factor (PDGF)-B is involved in pericyte recruitment, and brain capillaries of mice with a genetic ablation of PDGF-B show pericyte loss and microaneurysms. We investigated the role of capillary coverage with pericytes in early diabetic retinopathy and the contribution to proliferative retinopathy using mice with a single functional allele of PDGF-B (PDGF-B(+/-) mice). As assessed by quantitative morphometry of retinal digest preparations, pericyte numbers in nondiabetic PDGF-B(+/-) mice were reduced by 30% compared with wild-type mice, together with a small but significant increase in acellular capillaries. Pericyte numbers were reduced by 40% in diabetic wild-type mice compared with nondiabetic wild-type controls. Pericyte numbers were decreased by 50% in diabetic PDGF-B(+/-) mice compared with nondiabetic wild-type littermates, and the incidence of acellular capillaries was increased 3.5-fold when compared with nondiabetic PDGF-B(+/-) mice. To investigate the effect of pericyte loss in the context of ongoing angiogenesis, we subjected mice to hypoxia-induced proliferative retinopathy. As a result, PDGF-B(+/-) mice developed twice as many new blood vessels as their wild-type littermates. We conclude that retinal capillary coverage with pericytes is crucial for the survival of endothelial cells, particularly under stress conditions such as diabetes. At high vascular endothelial growth factor levels, such as those in the retinopathy of prematurity model, pericyte deficiency leads to reduced inhibition of endothelial proliferation in vivo.
560 citations
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560 citations
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TL;DR: Estimated upper boundaries for selective concentrations (lowest MICs) and PNECs for resistance selection for all common antibiotics are provided, which can guide implementation of compound-specific emission limits that take into account risks for resistance promotion.
558 citations
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TL;DR: The molecular structure of 1,2-dimyristoyl-sn-glycero-3-phosphorylcholine (DMPC), a lecithin species in the naturally occurring configuration, is solved from a water-containing solution, with two water molecules (5% w/w) of hydration.
Abstract: Lecithin is a major structural component of biological membranes. Because of their amphipathic nature, lecithin and related phospholipids tend to aggregate as bilayer structures in which the hydrophilic head groups are orientated towards the surface and the hydrophobic hydrocarbon chains towards the interior. A detailed knowledge of the three-dimensional structure of lecithins will aid in the understanding of their role in membrane structure and function, but is still lacking. To this end we have now crystallised and solved the molecular structure of 1,2-dimyristoyl-sn-glycero-3-phosphorylcholine (DMPC), a lecithin species in the naturally occurring configuration. This compound crystallises from a water-containing solution, with two water molecules (5% w/w) of hydration.
558 citations
Authors
Showing all 24120 results
Name | H-index | Papers | Citations |
---|---|---|---|
Peter J. Barnes | 194 | 1530 | 166618 |
Luigi Ferrucci | 193 | 1601 | 181199 |
Richard H. Friend | 169 | 1182 | 140032 |
Napoleone Ferrara | 167 | 494 | 140647 |
Timothy A. Springer | 167 | 669 | 122421 |
Anders Björklund | 165 | 769 | 84268 |
Hua Zhang | 163 | 1503 | 116769 |
Kaj Blennow | 160 | 1845 | 116237 |
Leif Groop | 158 | 919 | 136056 |
Tomas Hökfelt | 158 | 1033 | 95979 |
Johan G. Eriksson | 156 | 1257 | 123325 |
Naveed Sattar | 155 | 1326 | 116368 |
Paul Elliott | 153 | 773 | 103839 |
Claude Bouchard | 153 | 1076 | 115307 |
Hakon Hakonarson | 152 | 968 | 101604 |