检索结果-南通市图书馆

Grazing Pressure and Plant Functional Types in Puna Highlands,Northwestern Argentina

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第5期93卷 1067-1080页

作者： quiroga Mendiola Mariana Tálamo Andrés IPAF NOA—INTA(National Institute for Agricultural Technology) Posta de HornillosJujuy4622Argentina Facultad de Ciencias Naturales Universidad Nacional de SaltaSalta4400Argentina Instituto de Bio y Geociencias del NOA(IBIGEO) UNSa-CONICET.Laboratorio de Ecología Aplicada a la Conservación(LEAC)Facultad de Ciencias NaturalesUniversidad Nacional de SaltaSalta4400Argentina Maestría en Gestión Ambiental Escuela de NegociosUniversidad Católica de Salta(UCASAL)Salta4400Argentina

The Puna grasslands support grazing systems that produce meat and wool in multi-species herds,especially from llama(Lama glama)and sheep.However,it is yet unknown whether grazing pressure can modify grassland structure and Plant Functional Types diversity and cover in Puna grasslands.We analyzed the relationship between grazing pressure and Plant Functional Types by comparing transects located near stockyards(high grazing pressure)and far from them(low pressure)and by evaluating the relationship between the Plant Functional Types cover to a Grazing Pressure Index(GPI).This index incorporates the heterogeneity of traditional pastoral management.At two ecological sites(Ciénego and Tolar),we sampled paired transects(near-far).Plots near and far from corrals were similar in all the variables measured except for plots in Tolar,which tend to have higher total cover,possibly due to fecal fertilization near stockyards.Furthermore,we recorded an increase in total cover and grass cover at higher GPI in Ciénego,while in Tolar we found lower values of total cover and herbaceous dicotyledonous cover at intermediate intensities of GPI.The only negative relationship found was the cover of clonal and non-clonal shrubs,possibly explained by the greater use of these shrubs as firewood near stockyards.In summary,our study does not show important changes in Plant Functional Types as a function of grazing pressure in the studied grasslands probably because grazing pressure is diluted or diminished when livestock rotates in different areas and grazing durations vary.Finally,the long grazing history with which the Puna has evolved could also contribute to the co-structuration between native vegetation and livestock farming.

关键词： Natural grasslands Puna herbivory ecological perturbation

Letter to the Editor concerning:Gallbladder perforation:A single-center experience in north India and a step-up approach for management

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2022年第6期21卷 617-618页

作者： Hermilo Jeptef Angeles-Mar Mariano Garcia-Camp RodrigoEnrique Elizondo-Omaña Santos Guzmán-López Javier Humberto Martinez-Garza Alejandro quiroga-Garza Universidad Autonoma de Nuevo Leon School of MedicineHuman Anatomy DepartmentMonterreyNuevo León CP 64460México Universidad Autonoma de Nuevo Leon School of MedicinePlataforma INVEST-KER Unito Mayo Clinic(KER Unit Mexico)MonterreyNuevo LeónMéxico General Surgery Division Instituto Mexicano del Seguro SocialMonterreyNuevo LeónMéxico

To the Editor:We sincerely applaud the work done by Gupta et al.,in which they analyzed a single-center experience regarding gallbladder per-foration(GBP)management[1].Currently,there is a lack of cohort studies to adequately describe the approach strategies and man-agement for this pathology,with international guidelines making ambiguous recommendations[2,3].Their study stratified GBP types and provided details regarding clinical presentation,comorbidities,preoperative diagnosis,etiology,imaging techniques,and surgical approach.The study reported a high conversion rate when a la-paroscopic approach was attempted for cholecystectomy.

关键词： diagnosis concerning approach

Regulatory effects of miR-19a on MAD2 expression and tumorigenesis in gastric cancer

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Genes & Diseases 2023年第4期10卷 1180-1182页

作者： J.Bargiela-Iparraguirre J.M.Herrero N.Pajuelo-Lozano M.Perez R.Perona A.G.quiroga C.Calés I.Sanchez-Perez Dpto.de Bioquímica.Fac.Medicina UAMMadrid 28029Spain Biomedical Research Institute of Madrid CSIC/UAMMadrid 28029Spain Cancer Stem Cell and Fibroinflammatory Microenvironment Group Chronic Diseases and Cancer Area 3-Instituto Ramón y Cajal de Investigación Sanitaria(IRYCIS)Madrid 28034Spain Unidad Asociada de Biomedicina UCLM-CSIC Madrid 28029 Spain CIBER for Rare Diseases(CIBERER) Instituto de Salud CarlosⅢ Madrid 28029Spain Dpto.de Anatomía Histología y Neurociencia.Fac.Medicina UAMMadrid 28029Spain g Dpto.de Química Inorgánica Fac.Ciencias UAMMadrid 28049Spain

Gastric cancer(GC)is worldwide the sixth most diagnosed and third leading cause of cancer deaths,with poor and late prognosis,probably due to post-surgery adjuvant treatment resistance and lack of a thorough panel of prognostic markers.We have previously shown that mitotic arrest deficient 2(MAD2,encoded by MAD2L1),a key protein of the spindle assembly checkpoint,is relevant in GC cells;its interference impairs migration and growth,while its overexpression cor-relates with tumorigenesis.

关键词： MAD2 tumorigenesis Gastric

Distribution of action movements （DAM）： a descriptor for human action recognition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2015年第6期9卷 956-965页

作者： Franco RONCHETTI Facundo quiroga Laura LANZARINI Cesar ESTREBOU Instituto de Investigacion en Informatica III-LIDI Facultad de Informatica Universidad Nacional de La Plata La Plata B 1900AWX Argentina

Human action recognition from skeletal data is an important and active area of research in which the state of the art has not yet achieved near-perfect accuracy on many well- known datasets. In this paper, we introduce the Distribution of Action Movements Descriptor, a novel action descriptor based on the distribution of the directions of the motions of the joints between frames, over the set of all possible mo- tions in the dataset. The descriptor is computed as a normal- ized histogram over a set of representative directions of the joints, which are in turn obtained via clustering. While the descriptor is global in the sense that it represents the overall distribution of movement directions of an action, it is able to partially retain its temporal structure by applying a window- ing scheme. The descriptor, together with performs several state-of-the-art known datasets. a standard classifier, out- techniques on many well-

关键词： human action recognition descriptor Prob-SOM MSRC12 Action3D

Helicobacter pylori CagA protein polymorphisms and their lack of association with pathogenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第31期16卷 3936-3943页

作者： Nicole Acosta Andrés quiroga Pilar Delgado María Mercedes Bravo Carlos Jaramillo Molecular Diagnostics and Bioinformatics Laboratory Biological Sciences DepartmentLos Andes University Infectious Agents and Cancer Research Group National Cancer Institute(Colombia)

AIM: To investigate Helicobacter pylori (H. pylori) CagA diversity and to evaluate the association between protein polymorphisms and the occurrence of gastric pathologies. METHODS: One hundred and twenty-two clinical isolates of H. pylori cultured from gastric biopsies obtained from Colombian patients with dyspepsia were included as study material. DNA extracted from isolates was used to determine cagA status, amplifying the C-terminal cagA gene region by polymerase chain reaction. One hundred and six strains with a single amplicon were sequenced and results were used to characterize the 3' variable region of the cagA gene. To establish the number and type of tyrosine phosphorylation motifs Glutamine acid-Proline-Isoleucine-Tyrosine-Alanine (EPI-YA) bioinformatic analysis using Amino Acid Sequence Analyzer-Amino Acid Sequence Analyzer software was conducted. Analysis of the association between the number of EPIYA motifs and the gastric pathology was performed using χ2 test and analysis of the presence of EPIYA-C motifs in relation to the pathology was made by logistic regression odds ratios. Comparisons among EPIYA types found and those reported in GenBank were performed using a proportion test in Statistix Analytical Software version 8.0. RESULTS: After amplification of the 3' of the cagA gene, 106 from 122 isolates presented a single amplicon and 16 showed multiple amplicons. As expected, diversity in the size of the cagA unique fragments among isolates was observed. The 106 strains that presented a single amplicon after 3' cagA amplification came from patients with gastritis (19 patients), atrophic gastritis (21), intestinal metaplasia (26), duodenal ulcer (22) and gastric cancer. DNA sequence analysis showed that the differences in size of 3' cagA unique fragments was attributable to the number of EPIYA motifs: 1.9% had two EPIYA motifs, 62.3% had three, 33.0% had four and 2.8% had five motifs. The majority of tested clinical strains (62.3%) were found to harbor the ABC combination of EPIYA motifs and a signi

关键词： Helicobacter pylori CagA-protein polymorphisms Molecular characterization Bioinformatic analysis Pathogenesis Cancer

New perspectives in occult hepatitis C virus infection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2012年第23期18卷 2887-2894页

作者： Vicente Carreño Javier Bartolomé Inmaculada Castillo Juan Antonio quiroga Foundation for the Study of Viral Hepatitis C/Guzmán el Bueno 7228015 MadridSpain

Occult hepatitis C virus (HCV) infection, defined as the presence of HCV RNA in liver and in peripheral blood mononuclear cells (PBMCs) in the absence of detectable viral RNA in serum by standard assays, can be found in anti-HCV positive patients with normal serum levels of liver enzymes and in anti-HCV negative patients with persistently elevated liver enzymes of unknown etiology. Occult HCV infection is distributed worldwide and all HCV genotypes seem to be involved in this infection. Occult hepatitis C has been found not only in anti-HCV positive subjects with normal values of liver enzymes or in chronic hepatitis of unknown origin but also in several groups at risk for HCV infection such as hemodialysis patients or family members of patients with occult HCV. This occult infection has been reported also in healthy populations without evidence of liver disease. Occult HCV infection seems to be less aggressive than chronic hepatitis C although patients affected by occult HCV may develop liver cirrhosis and even hepatocellular carcinoma. Thus, anti-HCV negative patients with occult HCV may benefit from antiviral therapy with pegylated-interferon plus ribavirin. The persistence of very low levels of HCV RNA in serum and in PBMCs, along with the maintenance of specific T-cell responses against HCV-antigens observed during a long-term follow-up of patients with occult hepatitis C, indicate that occult HCV is a persistent infection that is not spontaneously eradicated. This is an updated report on diagnosis, epidemiology and clinical implications of occult HCV with special emphasis on anti-HCV negative cases.

关键词：丙型肝炎病毒病毒感染隐匿性外周血单个核细胞肝脏疾病抗病毒治疗 T细胞反应抗原特异性

Substance use and inhalation injury in adult burn patients:retrospective study of the impact on outcomes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Burns & Trauma 2019年第1期7卷 132-138页

作者： Kevin M.Klifto Luis quiroga C.Scott Hultman Department of Plastic and Reconstructive Surgery Johns Hopkins Burn CenterThe Johns Hopkins Hospital4940 Eastern AvenueBaltimore 21224USA

Background:Substance use,alcohol use,and smoking use have all been associated with burn injury.Few studies have investigated associations with substances,alcohol,smoking,inhalational only burns,and patient outcomes.The purpose of the study was to identify risk factors for pulmonary failure in patients suffering inhalation injury,focusing on the impact of substance,alcohol,and cigarette use.Methods:This is a single-center retrospective analysis of 115 patients admitted to the Johns Hopkins Bayview Burn Center with inhalational injury from January 1,2010,through September 30,2018.Patients were excluded if they were under the age of 18 years or had burn involvement of the skin>5%.Primary outcome variables measured were if patients were intubated,length of total time intubated,substance use,alcohol use,and smoking use.Secondary outcome variables measured were types of substances used(amphetamines,barbiturates,benzodiazepines,cannabinoids,cocaine,methadone,codeine/morphine),total number of substances used,intensive care unit(ICU)length of stay(LOS),hospital LOS,secondary complications,and patient mortality.Analysis was performed with Fisher’s exact test and the Mann-Whitney U test.A sub-group analysis for each substance,alcohol,smoking,and control subgroup was compared to its respective sub-group without substance,alcohol,smoking,and control within the no intubation and intubation group.A sub-group analysis of substance use,alcohol use,smoking use,and control was further analyzed with binomial logistic regression within the intubation group.Results:Following inhalation injury,50/115(43%)patients required intubation.Forty-two of the 50(84%)patients intubated had substance use(p<0.001).Thirty-one of the 50(62%)patients intubated had history of smoking(p=0.038).Among the specific substances used,26/50(52%)patients intubated were using benzodiazepines(p<0.001)and 7/50(14%)patients were using cocaine(p=0.022).The lengths of intubation,ICU LOS,and hospital LOS with no substance use were shorter than with substance use(p<0.0

关键词： Intubation Smoking Burn Risk factors Cocaine Benzodiazepines Morphine Inhalation

Gallbladder perforation with fistulous communication

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2023年第6期15卷 1191-1201页

作者： Alejandro quiroga-Garza Neri Alejandro Alvarez-Villalobos Milton Alberto Muñoz-Leija Mariano Garcia-Campa Hermilo Jeptef Angeles-Mar Guillermo Jacobo-Baca Rodrigo Enrique Elizondo-Omana Santos Guzman-Lopez Human Anatomy Department Universidad Autonoma de Nuevo LeonSchool of MedicineMonterrey 64460Nuevo LeonMexico General Surgery Division Hospital de Traumatología y Ortopedia No.21Instituto Mexicano del Seguro SocialMonterrey 64000Nuevo LeonMexico Plataforma INVEST Medicina UANLKER Unit Mayo Clinic Universidad Autonoma de Nuevo LeonSchool of MedicineMonterrey 64460Nuevo LeonMexico Family Medicine Division Instituto Mexicano del Seguro SocialMonterrey 64000Nuevo LeonMexico Surgery Division Hospital General de Zona No.6Instituto Mexicano del Seguro SocialMonterrey 64000Nuevo LeonMexico

BACKGROUND The management of gallbladder perforation(GBP)with fistulous communication(Neimeier type I)is controversial.AIM To recommend management options for GBP with fistulous communication.METHODS A systematic review of studies describing the management of Neimeier type I GBP was performed according to the PRISMA guidelines.The search strategy was conducted in Scopus,Web of Science,MEDLINE,and EMBASE(May 2022).Data extraction was obtained for patient characteristics,type of intervention,days of hospitalization(DoH),complications,and site of fistulous communication.RESULTS A total of 54 patients(61%female)from case reports,series,and cohorts were included.The most frequent fistulous communication occurred in the abdominal wall.Patients from case reports/series had a similar proportion of complications between open cholecystectomy(OC)and laparoscopic cholecystectomy(LC)(28.6 vs 12.5;P=0.569).Mortality was higher in OC(14.3 vs 0.0;P=0.467)but this proportion was given by only one patient.DoH were higher in OC(mean 26.3 d vs 6.6 d).There was no clear association between higher rates of complications of a given intervention in cohorts,and no mortality was observed.CONCLUSION Surgeons must evaluate the advantages and disadvantages of the therapeutic options.OC and LC are adequate options for the surgical management of GBP,with no significant differences.

关键词： Gallbladder perforation Open cholecystectomy Laparoscopic cholecystectomy Fistulous communication

Study of reverse osmosis membranes fouling by inorganic salts and colloidal particles during seawater desalination

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2020年第3期28卷 733-742页

作者： Santiago Gutiérrez Ruiz Juan Antonio López-Ramírez Mohammed Hassani Zerrouk Agata Egea-Corbacho Lopera JoséMaría quiroga Alonso Department of Environmental Technologies Faculty of Marine and Environmental SciencesUniversity of Cadiz11510Puerto RealCadizSpain

Fouling phenomenon is considered among the major reasons that cause significant increase of operating cost of desalination plants equipped with reverse osmosis(RO)membranes.This phenomenon is studied in the present work in the case of RO polyamide aromatic membranes using model seawater containing inorganic salts and colloidal compounds.Different solubility conditions of CaCO3 and CaSO4 were applied to study RO performances with and without colloid presence.During experiments,the membrane permeate fluxes were continuously monitored.Moreover,studies of chemical composition,structure,and morphology of the materials deposited on the membrane surface were conducted using energy dispersive microanalysis(EDS)X-ray diffraction and scanning electronic microscopy(SEM).Results show that in conditions of calcium carbonate oversaturation there is a reduction in the permeate flow of 11.2%due to fouling of the membrane by the precipitation of this compound.While in the same conditions of calcium sulphate oversaturation the reduction of the flow is 5%,so we can conclude that in conditions of oversaturation of both salts,calcium carbonate produces a greater fouling of the membrane that in its view causes greater decrease in the flow of permeate.All this based on the results of the test with both salts in oversaturated conditions.Resulting in the formation of calcite and gypsum crystals onto the membranes as XRD analyses stated.Additional presence of colloidal silica in those conditions intensifies strongly the fouling,leading until to 24.1%of permeate flux decrease.

关键词： Reverse osmosis Desalination Fouling Seawater Scaling