检索结果-南通市图书馆

The Medicago truncatula Sucrose Transporter Family： Characterization and Implication of Key Members in Carbon Partitioning towards Arbuscular Mycorrhizal Fungi

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2012年第6期5卷 1346-1358页

作者： joan Doidy Diederik van Tuinen Olivier Lamotte Marion Corneillat Gerard Alcaraz Daniel Wipf UMR INRA 1347 Agrosup Universite de Bourgogne Agro~cologie P61e Interactions Plantes Microorganismes ERL CNRS 6300 BP 86510 21065 DijonCedex France

We identified de novo sucrose transporter （SUT） genes involved in long-distance transport of sucrose from photosynthetic source leaves towards sink organs in the model leguminous species Medicago truncatula. The iden- tification and functional analysis of sugar transporters provide key information on mechanisms that underlie carbon partitioning in plant-microorganism interactions. In that way, full-length sequences of the M. truncatula SUT （MtSUT） family were retrieved and biochemical characterization of MtSUT members was performed by heterologous expression in yeast. The MtSUT family now comprises six genes which distribute among Dicotyledonous clades. MtSUTI-1 and MtSUT4-1 are key members in regard to their expression profiles in source leaves and sink roots and were characterized as functional H~/sucrose transporters. Physiological and molecular responses to phosphorus supply and inoculation by the arbuscular mycorrhizal fungus （AMF） Glomus intraradices was studied by gene expression and sugar quantification analyses. Sucrose represents the main sugar transport form in M. truncatula and the expression profiles of MtSUTI-1, MtSUT2, and MtSUT4-1 highlight a fine-tuning regulation for beneficial sugar fluxes towards the fungal symbiont. Taken together, these results suggest distinct functions for proteins from the SUT1, SUT2, and SUT4 clades in plant and in bio- trophic interactions.

关键词： sugar transport sucrose transporter SUT sugar partitioning Medicago truncatula Glomus intraradices.

Landscape effects on the thermotolerance of carabid beetles and the role of behavioral thermoregulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2023年第1期30卷 251-263页

作者： Luck Alford Sacha Roudine Jean-Sébastien Pierre Francoise Burel joan van Baaren UMR 6553 ECOBIO Universitede Rennes 1Rennes CedexFrance School of Biological Sciences Universityof BristolBristolUK

Physiological thermotolerance and behavioral thermoregulation are central to seasonal cold adaptation in ectothermic *** species with enhanced mobility,behavioral responses may be of greater importance in the cold stress *** the carabid beetles as a study organism,the current study compared physiological thermotolerance and behavioral thermoregulation in carabid species inhabiting cereal fields in different landscape contexts,from fine grain heterogeneous“complex”landscapes to homogenous“simple”*** thermotolerance was determined via measurement of the CTmin and chill coma *** responses to cold temperature exposure were determined employing a purpose built arena,and thoracic temperature measured to estimate the efficacy of the behavior as a form of behavioral *** revealed an influence of landscape composition on the cold tolerance of carabid beetles,although species differed in their sensitivity to landscape intensification.A reduced effect of landscape on the thermotolerance of larger carabid beetles was observed,thought to be the consequence of greater mobility preventing local acclimation to microclimatic variation along the landscape intensification *** into behavioral thermoregulation of the 3 largest species revealed burrowing behavior to be the main behavioral response to cold stress,acting to significantly raise carabid body *** finding highlights the importance of behavioral thermoregulation as a strategy to evade cold *** use of behavioral thermoregulation may negate the need to invest in physiological thermotolerance,further offering explanation for the lack of landscape effect on the physiological thermotolerance of larger carabids.

关键词： agroecosystems local adaptation physiological thermal tolerance plasticity winter resistance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Lady Liberty

Lady Liberty

Impact of the COVID-19 pandemic and generational heterogeneity on ecommerce shopping styles-A case study of Sacramento,California

作者： essays by joan Marans Dim

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

Communications in Transportation Research 2023年第1期3卷 53-61页

作者： Qianhua Luo Teddy Forscher Susan Shaheen Elizabeth Deakin joan L.Walker Department of Civil and Environmental Engineering University of CaliforniaBerkeleyCA94720USA Transportation Sustainability Research Center University of CaliforniaBerkeleyCA94704USA Department of City and Regional Planning University of CaliforniaBerkeleyCA94720USA Center for Global Metropolitan Studies University of CaliforniaBerkeleyCA94720USA

The COVID pandemic has accelerated the growth of ecommerce and reshaped shopping patterns,which in turn impacts trip-making and vehicle miles *** objectives of this study are to define shopping styles and quantify their prevalence in the population,investigate the impact of the pandemic on shopping style transition,understand the generational heterogeneity and other factors that influence shopping styles,and comment on the potential impact of the pandemic on long-term shopping *** months after the initial shutdown(May/June 2021),we collected ecommerce behavioral data from 313 Sacramento Region households using an online survey.A K-means clustering analysis of shopping behavior across eight commodity types identified five shopping styles,including ecommerce independent,ecommerce dependent,and three mixed modes *** found that the share of ecommerce independent style shifted from 55%pre-pandemic to 27%during the ***,30%kept the same style as pre-pandemic,54%became more ecommerce dependent,and 16%became less ecommerce dependent,with the latter group more likely to view shopping an excuse to get *** was found across ***-pandemic,Millennials and Gen Z were the most ecommerce dependent,but during the pandemic they made relatively small shifts toward increased ecommerce *** Boomers and the Silent Generation were bimodal,either sticking to in-person shopping or shifting to ecommercedependency during the ***-pandemic intentions varied across styles,with households who primarily adopt non-food ecommerce intending to reverse back to in-person shopping,while the highly ecommerce dependent intend to limit future in-store activities.

关键词： Ecommerce COVID pandemic Shopping patterns Generational heterogeneity

Intraspecific maternal competition in insect parasitoids induces summer diapause in insect parasitoids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2018年第6期25卷 1080-1088页

作者： Kévin Tougeron George Hraoui Cécile Le Lann joan van Baaren Jacques Brodeur UMR-CNRS 6553Ecobio Universitéde Rennes 1RennesFrance Université Bretagne Loire Cité InternationaleRennesFrance Département de Sciences Biologiques Institut de Recherche en Biologie VegétaleUniversitéde MontréalMontréalCanada

Organisms often live in unpredictable environments and have to adopt life history strategies that optimize their fitness under these *** to bet-hedging theory,individuals can reduce variation in fitness outcomes by investing in different strategies at the same *** arthropods,facultative summer diapause enables survival during dry and hot periods of the year,and can be triggered by a decrease in resource abundance. However,the effect of resource depletion on diapause induction has never been disentangled from the effect of the perception of the presence of *** two solitary parasitoid species of cereal aphids as a model system,Aphidius avenae (Haliday)and Aphidius rhopalosiphi (De Stefani-Perez)(Hymenoptera:Braconidae),we tested whether (i)low absolute host density and/or (ii)high levels of parasitoid females'competition lead to maternal-induced summer diapause in parasitoid *** summer-like climatic conditions,emerging parasitoid females were (i)reared alone and exposed to different host densities (from 5 to 130 aphids),or (ii)reared together with competing females (from 2 to 20 females)and then exposed individually to 50 *** both parasitoid species, low aphid densities did not induce summer ***,the incidence of summer diapause increased up to a maximum of 11% with increasing levels of competition expe rienced by female *** than 60% of the females produced both diapausing and nondiapausing offspring after being kept at the two highest competition densities. Such a "spreading-the-risk"strategy has likely evolved to optimize parasitoid fitness by preventing the following generation from exposure to low populations of suitable hosts and high mortality from *** results provide the first experimental evidence of direct maternal competition-induced diapause in insects,and may change the way we apprehend the evolution of arthropod seasonal ecology,by considering intraspecific c

关键词： aestivation bet-hedging host density intraspecific competition superparasitism

Case report of acute-on-chronic liver failure secondary to diffuse large B-cell lymphoma

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 2014年第44期20卷 16774-16778页

作者： Yahuza Siba Kenechukwu Obiokoye Richard Ferstenberg James Robilotti joan Culpepper-Morgan Department of Medicine Columbia University Medical Center Harlem Hospital Center Division of Gastroenterology Department of Medicine Columbia University Medical Center Harlem Hospital Center

Acute liver failure is a rare presentation of hematologic malignancy. Acute on chronic liver failure(ACLF) is a newly recognized clinical entity that describes acute hepatic decompensation in persons with preexisting liver disease. Diffuse large B-cell lymphoma(DLBCL) is an aggressive non-Hodgkin's lymphoma(NHL) with increasing incidence in older males, females and blacks. However, it has not yet been reported, to present with acute liver failure in patients with preexisting chronic liver disease due to human immunodeficiency virus(HIV)/hepatitis C virus(HCV) co-infection. We describe a case of ACLF as the presenting manifestation of DLBCL in an elderly black man with HIV/HCV coinfection and prior Hodgkin's disease in remission for three years. The rapidly fatal outcome of this disease is highlighted as is the distinction of ACLF from decompensated cirrhosis. Due to the increased prevalence of HIV/HCV co-infection in the African American 1945 to 1965 birth cohort and the fact that both are risk factors for chronic liver disease and NHL we postulate that the incidence of NHL presenting as ACLF may increase.

关键词： Diffuse large B-cell lymphoma Acute-on-chronic liver failure Human immunodeficiency virus Hepatitis C virus Hodgkin's disease Fatal outcome

Ubiquitin-proteasome system and oxidative stress in liver transplantation

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 2018年第31期24卷 3521-3530页

作者： Norma Alva Arnau Panisello-Roselló Marta Flores joan Roselló-Catafau Teresa Carbonell Department of Cell Biology Physiology and ImmunologyUniversity of Barcelona Experimental Pathology Department Institute of Biomedical Research of Barcelona

A major issue in organ transplantation is the development of a protocol that can preserve organs under optimal conditions. Damage to organs is commonly a consequence of flow deprivation and oxygen starvation following the restoration of blood flow and reoxygenation. This is known as ischemia-reperfusion injury(IRI): a complex multifactorial process that causes cell damage. While the oxygen deprivation due to ischemia depletes cell energy, subsequent tissue oxygenation due to reperfusion induces many cascades, from reactive oxygen species production to apoptosis initiation. Autophagy has also been identified in the pathogenesis of IRI, although such alterations and their subsequent functional significance are controversial. Moreover, proteasome activation may be a relevant pathophysiological mechanism. Different strategies have been adopted to limit IRI damage, including the supplementation of commercial preservation media with pharmacological agents or additives. In this review, we focus on novel strategies related to the ubiquitin proteasome system and oxidative stress inhibition, which have been used to minimize damage in liver transplantation.

关键词： Liver transplant Ischemia-reperfusion injury Oxidative stress Proteasome Redox regulation Ubiquitin

Use of granulocyte/monocytapheresis in ulcerative colitis:A practical review from a European perspective

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 2021年第10期27卷 908-918页

作者： Eugeni Domènech joan-Ramon Grífols Ayesha Akbar Axel U Dignass Department of Gastroenterology Hospital Universitari Germans Trias i PujolBadalona 08916CataloniaSpain Department of Medicine Universitat Autònoma de BarcelonaBadalona 08916CataloniaSpain Centro de Investigaciones Biomédicas en Red de Enfermedades Hepáticas y Digestivas(CIBEREHD) Badalona 08916CataloniaSpain Blood and Tissue Bank Hospital Universitari Germans Trias i PujolBadalona 08916CataloniaSpain IBD Unit St.Mark’s Hospital and Academic InstituteLondon HA13UJUnited Kingdom Department of Medicine I Agaplesion Markus HospitalGoethe-UniversityFrankfurt am Main 60431Germany

Half of the patients with ulcerative colitis require at least one course of systemic corticosteroids in their *** 75%of these patients will also require immunosuppressive drugs(i.e.,thiopurines or biological agents)in the mid-term to avoid *** drugs raise some concerns due to an increased risk of serious and opportunistic infections and cancer,particularly in elderly and co-morbid patients,underlining the unmet need for safer alternative ***/monocytapheresis(GMA),a CE-marked,non-pharmacological procedure for the treatment of ulcerative colitis(among other immune-mediated diseases),remains the only therapy targeting neutrophils,the hallmark of pathology in ulcerative *** has proven its efficacy in different clinical scenarios and shows an excellent and unique safety *** spite of being a first line therapy in Japan,GMA use is still limited to a small number of centres and countries in *** this article,we aim to give an overview from a European perspective of the mechanism of action,recent clinical data on efficacy and practical aspects for the use of GMA in ulcerative colitis.

关键词： Granulocyte Monocyte Ulcerative colitis Inflammatory bowel disease Apheresis Safety

Esophageal intramural pseudodiverticulosis,a rare cause of food impaction:case report and review of the literature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Gastroenterology Report 2015年第2期3卷 175-178页

作者： Yahuza Siba Saritha Gorantla Anand Gupta Edward Lung joan Culpepper-Morgan Department of Medicine Columbia University Medical CenterHarlem Hospital CenterNew YorkNYUSA Division of Gastroenterology Department of MedicineColumbia University Medical CenterHarlem Hospital CenterNew YorkNYUSA

Esophageal intramural pseudodiverticulosis(EIPD)is a rare,benign condition of uncertain etiology and pathogenesis,which usually presents with either progressive or intermittent *** presentation with food impaction,requiring emergency esophago-gastroduodenoscopy(EGD),is *** report a case of EIPD presenting as food bolus impaction in an elderly black *** patient had no previous history of dysphagia or *** accepted risk factors,such as diabetes mellitus,chronic alcoholism,and reflux esophagitis,were not present in our *** EGD established the diagnosis and also dislodged the food *** evaluation of the mucosa diagnosed co-existent acute candidal *** treatment with proton pump inhibitor and azole antifungal led to resolution of her *** of the literature revealed that stenosis,strictures,perforation,gastro-intestinal bleed,and fistula formation are potential complications of *** motility abnormalities have been described but are not *** of the underlying inflammatory and or infectious condition is the mainstay of management of this unusual condition.

关键词： esophageal intramural pseudodiverticulosis food impaction dysphagia esophageal candidiasis