|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Relationship between Physical and Chemical Soil Attributes and Plant Species Diversity in Tropical Mountain Ecosystems from Brazil显示文摘Although the high diversity of plant species in the rupestrian fields has been primarily attributed to the existence of a set of distinct habitats, few studies support this assertion. The present study aimed to further investigate the relationship between physical and chemical attributes of soils with the diversity of plant species in this unique ecosystem. The rupestrian field is a unique vegetation formation that covers some of the southeastern Brazilian mountains in the transition of the Atlantic rain forest and the Cerrado(savanna). Different habitats occur according to soil characteristics(e.g., presence of rocks, sand, fertility, hydrology, etc.). These attributes ultimately influence the vegetation that is highly adapted to the harsh edaphic and climatic mountain conditions. Five distinct habitats were studied by us: rocky outcrops, peat bogs, sandy bogs, quartz gravel fields, and 'cerrado'(savanna). A floristic survey indicated that four families are found at greater frequency: Poaceae, Asteraceae, Cyperaceae, and Leguminosae. The greatest diversity of plant species was found in the rocky outcrops habitat, followed by cerrado, peat bog, quartz gravel grassland, and sandy bogs, respectively. The main difference in the floristic composition among these habitats was related to the dominant species. Trachypogon spicatus(Poaceae) was the most dominant species in the rocky outcrops, Axonopus siccus(Poaceae) in the peat bogs, Lagenocarpus rigidus(Cyperaceae) in the sandy bogs, Schizachyrium tenerum(Poaceae) in the cerrado, while Vellozia sp. 8(Velloziaceae) dominated the vegetation in the quartz gravel grassland. This study demonstrated that physical and chemical soil properties strongly related the diversity of plant species occurring in the different habitats of rupestrian fields. | Ferna de CARVALHO Edward Luis GODOY Francy J. G. LISBOA Fatima Maria de Souza MOREIRA Francisco Adriano de SOUZA Ricardo Luis Louro BERBARA G Wilson FERNES | 2014 | Journal of Mountain Science2014，11，4： | 7 |
| 2 | Juvenile polyposis syndrome显示文摘Juvenile polyposis syndrome is a rare autosomal dominant syndrome characterized by multiple distinct juvenile polyps in the gastrointestinal tract and an increased risk of colorectal cancer.The cumulative life-time risk of colorectal cancer is 39% and the relative risk is 34.Juvenile polyps have a distinctive histology characterized by an abundance of edematous lamina propria with inflammatory cells and cystically dilated glands lined by cuboidal to columnar epithelium with reactive changes.Clinically,juvenile polyposis syndrome is defined by the presence of 5 or more juvenile polyps in the colorectum,juvenile polyps throughout the gastrointestinal tract or any number of juvenile polyps and a positive family history of juvenile polyposis.In about 50%-60% of patients diagnosed with juvenile polyposis syndrome a germline mutation in the SMAD4 or BMPR1A gene is found.Both genes play a role in the BMP/TGF-beta signalling pathway.It has been suggested that cancer in juvenile polyposis may develop through the socalled 'landscaper mechanism' where an abnormal stromal environment leads to neoplastic transformation of the adjacent epithelium and in the end invasive carcinoma.Recognition of this rare disorder is important for patients and their families with regard to treatment,follow-up and screening of at risk individuals.Each clinician confronted with the diagnosis of a juvenile polyp should therefore consider the possibility of juvenile polyposis syndrome.In addition,juvenile polyposis syndrome provides a unique model to study colorectal cancer pathogenesis in general and gives insight in the molecular genetic basis of cancer.This review discusses clinical manifestations,genetics,pathogenesis and management of juvenile polyposis syndrome. | Lodewijk AA Brosens Danielle Langeveld W Arnout van Hattem Francis M Giardiello G Johan A Offerhaus | 2011 | World Journal of Gastroenterology2011，17，44： | 7 |
| 3 | Rescue Surgery for Unresectable Colorectal Liver Metastases Downstaged by Chemotherapy: A Model to Predict Long-term Survival显示文摘 | René Adam Valérie Delvart Gérard Pascal Adrian Valeanu Denis Castaing Daniel Azoulay Sylvie Giacchetti Bernard Paule Francis Kunstlinger Odile Ghémard Francis Levi Henri Bismuth | 2004 | Annals of Surgery2004，，4： | 2 |
| 4 | 在 7T 的多原子的磁性的回声光谱学的应用显示文摘 AIM: To discuss the advantages of ultra-high field (7T) for 1H and 13C magnetic resonance spectroscopy (MRS) studies of metabolism.made at both 3 and 7T using 1H MRS. Measurements of glycogen and lipids in muscle were measured using 13C and 1H MRS respectively. RESULTS: In the brain, increased signal-to-noise ratio (SNR) and dispersion allows spectral separation of the amino-acids glutamate, glutamine and γ-aminobutyric acid (GABA), without the need for sophisticated editing sequences. Improved quantification of these me-tabolites is demonstrated at 7T relative to 3T. SNR was 36% higher, and measurement repeatability (% coefficients of variation) was 4%, 10% and 10% at 7T, vs 8%, 29% and 21% at 3T for glutamate, glutamine and GABA respectively. Measurements at 7T were used to compare metabolite levels in the anterior cingulate cortex (ACC) and insula. Creatine and glutamate levels were found to be significantly higher in the insula compared to the ACC (P < 0.05). In muscle, the increased SNR and spectral resolution at 7T enables interleaved studies of glycogen (13C) and intra-myocellular lipid (IMCL) and extra-myocellular lipid (EMCL) (1H) following exercise and refeeding. Glycogen levels were sig-nificantly decreased following exercise (-28% at 50% VO2 max; -58% at 75% VO2 max). Interestingly, levels of glycogen in the hamstrings followed those in the quadriceps, despite reduce exercise loading. No changes in IMCL and EMCL were found in the study. CONCLUSION: The demonstrated improvements in brain and muscle MRS measurements at 7T will increase the potential for use in investigating human metabolism and changes due to pathologies. | Mary C Stephenson Frances Gunner Antonio Napolitano Paul L Greenhaff Ian A MacDonald Nadeem Saeed William Vennart Susan T Francis Peter G Morris | 2011 | World Journal of Radiology2011，3，4： | 2 |
| 5 | Insulin-like growth factors in poultry 显示文摘 | MCMURTYR J P FRANCIS G L UPTON Z | 1997 | Domest Anim Endocrinol1997，14，4： | 1 |
| 6 | Finite Basis Set Corrections to Total Energy Pseudopotential Calculations显示文摘 | Francis G P Payne M C | 1990 | J Phys Condens Matter1990，2，19： | 1 |
| 7 | Relationship quality and burden among caregivers for latestage cancer 显示文摘 | Francis L E Worthington J Kypriotakis G | 2009 | Support Care Cancer2009，18，11： | 1 |
| 8 | HRT: a new predictor for risk of sudden cardiac death 显示文摘 | Francis J Watanabe MA Schmidt G | 2005 | Ann Noninvasive Electrocardiol2005，10，1： | 1 |
| 9 | Grass pollen immunotherapy:IL-10 induction and suppression of late responses precedes IgG4 inhibitory antibody activity显示文摘 | Francis JN James LK Paraskevopoulos G | 2008 | J Allergy Clin Immunol2008，121，5： | 1 |
| 10 | Antinutri- tional factors present in plant-derived alternate fish feed ingredients and their effects in fish 显示文摘 | FRANCIS G MAKKAR H P S KLAUS B K | 2001 | Aquaculture2001，199，： | 1 |
| 11 | Differential gene expression in coronary arteries from patients presenting with ischemic heart disease: further evidence for the inflammatory basis of atherosclerosis显示文摘 | Satterthwaite G Francis SE Suvarna K | 2005 | Am Heart J2005，150，3： | 1 |
| 12 | Ferrocene-mediated enzyme electrode for amperometric determination of glucose显示文摘 | Cass A Davis G Francis G | 1984 | Anal Chem1984，56，4： | 1 |
| 13 | Effect of restricted feeding on the relationship between hypophysial portal concentrations of growth hormone ( GH)-releasing factor and somatostatin, and jugular concentrations of GH in ovariectomized ewes 显示文摘 | Thomas G B Cummins J T Francis H | 1991 | Endocrinology1991，128，： | 1 |
| 14 | CdTe and CdZnTe detectors behavior in X-ray computed tomography conditions 显示文摘 | Stephane R Francis G Michel G | 2000 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment2000，442，13： | 1 |
| 15 | The biological action of saponins in animal systems: a review显示文摘 | FRANCIS G KEREM Z MAKKAR H P | 2002 | British Journal of Nutrition2002，88，6： | 1 |
| 16 | Transmission ecology of Echinococcus multilocularis: What are the ranges of parasite stability among various host communities in China显示文摘 | Patrick G David P Francis R et ol | 2006 | Parasitol Inter2006，，： | 1 |
| 17 | Antinutntional factors present in plant-derived alternate fish feed ingredients and their effects in fish显示文摘 | Francis G Harinder P S M Becker K | 2001 | Aquaculture2001，199，： | 1 |
| 18 | Diffusion controlled growth of metallic nanoclusters at selected surface sites显示文摘 | Francis G M Kuipers L Palmer R E | 1996 | J Appl Phys1996，79，6： | 1 |
| 19 | The role of AI in CSH:NMR,XRD, and compositional results for precipi- tated samples显示文摘 | SUN G K FRANCIS Y J JAMES KIRKPATRICK R | 2006 | Cement and Concrete Research2006，36，1： | 1 |
| 20 | Phorbol esters: structure, biological activity, and toxicity in animals 显示文摘 | Goel G Makkar I-I P Francis G | 2007 | Int J Toxicol2007，26，4： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员