检索结果-南通市图书馆

Impact on Soil Organic C and total Soil N from Cool- and Warm-Season Legumes Used in a Green manure-Forage Cropping System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Sciences 2024年第3期15卷 333-357页

作者： Clark B. Neely Francis m. Rouquette Jr. Cristine L.S. morgan frank m. Hons William L. Rooney Gerald R. smith Department of Soil and Crop Science Washington State University Pullman WA USA texas A&m AgriLife Research Overton TX USA Chief Scientific Officer Soil Health Institute Morrisville NC USA Department of Soil and Crop Science Texas A&M University College Station TX USA

Annual forage legumes are important components of livestock production systems in East texas and the southeastern US. Forage legumes contribute nitrogen (N) to cropping systems through biological N fixation, and their seasonal biomass production can be managed to complement forage grasses. Our research objectives were to evaluate both warm- and cool-season annual forage legumes as green manure for biomass, N content, ability to enhance soil organic carbon (SOC) and soil N, and impact on post season forage grass crops. Nine warm-season forage legumes (WSL) were spring planted and incorporated as green manure in the fall. Forage rye (Secale cereale L.) was planted following the incorporation of WSL treatments. Eight cool-season forage legumes (CSL) were fall planted in previously fallow plots and incorporated as green manure in late spring. Sorghum-sudangrass (Sorghum bicolor x Sorghum bicolor var. sudanense) was planted over all treatments in early summer after forage rye harvest and incorporation of CSL treatments. Sorghum-sudangrass was harvested in June, August and September, and treatments were evaluated for dry matter and N concentration. Soil cores were taken from each plot, split into depths of 0 to 15, 15 to 30 and 30 to 60 cm, and soil C and N were measured using combustion analysis. Nylon mesh bags containing plant samples were buried at 15 cm and used to evaluate decomposition rate of above ground legume biomass, including change in C and N concentrations. mungbean (Vigna radiata L. [Wilczek]) had the highest shoot biomass yield (6.24 t Dm ha-1) and contributed the most total N (167 kg∙ha-1) and total C (3043 kg∙ha-1) of the WSL tested. Decomposition rate of WSL biomass was rapid in the first 10 weeks and very slow afterward. Winter pea (Pisum sativum L. spp. sativum), arrow leaf clover (trifolium vesiculosum Savi.), and crimson clover (trifolium incarnatum L.) were the most productive CSL in this trial. Austrian winter pea

关键词： Annual Legumes Soil N Soil Organic C Green manure Deer Browse Forage Cropping Systems

Legume Green manure and Intercropping for High Biomass Sorghum Production

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Sciences 2024年第6期15卷 605-621页

作者： Clark B. Neely Francis m. Rouquette Jr. Cristine L. S. morgan frank m. Hons William L. Rooney Gerald R. smith Department of Soil and Crop Science Washington State University Pullman WA USA texas A&m AgriLife Research Overton TX USA Soil Health Institute Morrisville NC USA Department of Soil and Crop Science Texas A&M University College Station TX USA

Before the advent of cheap, synthetic fertilizers, legumes were commonly used as green manure crops for their ability to fix atmospheric nitrogen (N). A three-year study at Overton, tX examined legume integration into high-biomass sorghum (Sorghum bicolor L.) production systems on a Lilbert loamy fine sand recently cultivated after a fertilized bermudagrass [Cynodon dactylon (L.) Pers.] pasture. In this split-split plot design, ‘Dixie’ crimson clover (trifolium incarnatum L.) and ‘Iron and Clay’ cowpea (Vigna unguiculata L.) were integrated into a high-biomass sorghum production system to evaluate impacts on N concentration, C concentration, and yield of high-biomass sorghum and their impacts on soil total N and soil organic carbon (SOC). main plots were split into crimson clover green manure (CLGm) and winter fallow (FALL) followed by three sub-plots split into warm-season crop rotations: cowpea green manure (CPGm), cowpea-sorghum intercrop (CPSR), and sorghum monocrop (SORG). three N fertilizer treatments (0, 45, 90 kg N∙ha−1) were randomized and applied as sub-sub plots. the CLGm increased (P sorghum biomass yield (16.5 t Dm∙ha−1) 28% in year three but had no effect in the first two years. the CPSR treatment reduced sorghum yield up to 62% compared to SORG;whereas CPGm increased sorghum yield 56% and 18% the two years following cowpea incorporation. Rate of N fertilizer had no effect on sorghum biomass yield. Decrease in SOC and soil N over time indicated mineralization of organic N and may explain why no N fertilizer response was observed in sorghum biomass yield. Cowpea showed strong potential as a green manure crop but proved to be too competitive for successful intercropping in high-biomass sorghum production systems.

关键词： High-Biomass Sorghum Legumes Green manure Intercrop Cowpea Crimson Clover Soil Organic Carbon Soil Nitrogen

Effective data sampling strategies and boundary condition constraints of physics-informed neural networks for identifying material properties in solid mechanics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2023年第7期44卷 1039-1068页

作者： W.WU m.DANEKER m.A.jolley K.t.tURNER L.LU Department of Anesthesiology and Critical Care medicine Children's Hospital of PhiladelphiaPhiladelphiaPA 19104U.S.A. Division of Pediatric Cardiology Children's Hospital of PhiladelphiaPhiladelphiaPA 19104U.S.A. Department of Chemical and Biomolecular Engineering University of PennsylvaniaPhiladelphiaPA 19104U.S.A. Department of mechanical Engineering and Applied mechanics University of PennsylvaniaPhiladelphiaPA 19104U.S.A.

material identification is critical for understanding the relationship between mechanical properties and the associated mechanical ***,material identification is a challenging task,especially when the characteristic of the material is highly nonlinear in nature,as is common in biological *** this work,we identify unknown material properties in continuum solid mechanics via physics-informed neural networks(PINNs).to improve the accuracy and efficiency of PINNs,we develop efficient strategies to nonuniformly sample observational *** also investigate different approaches to enforce Dirichlet-type boundary conditions(BCs)as soft or hard ***,we apply the proposed methods to a diverse set of time-dependent and time-independent solid mechanic examples that span linear elastic and hyperelastic material *** estimated material parameters achieve relative errors of less than 1%.As such,this work is relevant to diverse applications,including optimizing structural integrity and developing novel materials.

关键词： solid mechanics material identification physics-informed neural network(PINN) data sampling boundary condition(BC)constraint

Exome sequencing identifies a likely causative variant in 53%of families with ciliopathy-related features on renal ultrasound after excluding NPHP1 deletions

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 2024年第5期11卷 40-43页

作者： Konstantin Deutsch Verena Klambt thomas m.Kitzler tilman Jobst-Schwan Ronen Schneider Florian Buerger Steve Seltzsam Sherif El Desoky Jameela A.Kari Farkhanda Hafeez maria Szczepanska Loai A.Eid Hazem S.Awad muna Al-Saffar Neveen A.Soliman Velibor tasic Camille Nicolas-frank Kirollos Yousef Luca m.Schierbaum Sophia Schneider Abdul Halawi Izzeldin Elmubarak Katharina Lemberg Shirlee Shril Shrikant m.mane Nancy Rodig Friedhelm Hildebrandt Division of Nephrology Department of PediatricsBoston Children’s HospitalHarvard Medical SchoolBostonMA 02215USA Department of Pediatric Gastroenterology Nephrology and Metabolic DiseasesCharite Universitatsmedizin BerlinBerlin 13353Germany Berlin Institute of Health at Charitee Universitatsmedizin Berlin BIH Biomedical Innovation AcademyBIH Charite Clinician Scientist ProgramBerlin 10178Germany Department of Nephrology and Hypertension FriedrichAlexander-Universitat Erlangen-NurnbergErlangen 91054Germany Department of Pediatrics Faculty of Medicine King Abdulaziz UniversityPediatric Nephrology Center of ExcellenceKing Abdulaziz University HospitalJeddah 21589Saudi Arabia Department of Pediatric Nephrology The Children’s Hospital and Institute of Child HealthLahore 54000Pakistan Department of Pediatrics Faculty of Medical Sciences in ZabrzeMedical University of Silesia in KatowiceKatowice 40-752Poland Dubai Hospital and Al-Jalila Children’s Specialty Hospital Kidney Center of ExcellenceDubai 4545United Arab Emirates Department of Genetics and Genomics UAE UniversityAbu Dhabi 15551United Arab Emirates Department of Pediatrics Division of Genetics and GenomicsBoston Children’s HospitalHarvard Medical SchoolBostonMA 02215USA Department of Pediatrics Center of Pediatric Nephrology and TransplantationKasr Al Ainy School of MedicineCairo UniversityCairo 11562Egypt Egypt Center for Research and Regenerative medicine(ECRRm) Cairo 11511Egypt medical Faculty Skopje University Children’s HospitalSkopje 1000North Macedonia Department of Genetics Yale University School of MedicineNew HavenCT 06520USA

Nephronophthisis-related ciliopathies(NPHP-RC)represent one of the most common causes of chronic kidney disease in the first three decades of life and are characterized by a broad genetic and clinical heterogeneity.1 to date,more than 90 genes have been identified that cause autosomalrecessive NPHP-RC if mutated,accounting for up to 60%of cases.1 Among these,homozygous deletions of NPHP1 are the most common *** genes localize to primary cilia,basal bodies,or the centrosome and lead to a primary ciliary disruption if mutated,thereby causing a broad phenotypical spectrum.1 Patients that suffer from NPHP-RC can either have an isolated renal phenotype,such as polyuria,polydipsia,decreased urinary concentration ability,and secondary enuresis due to loss of tubular function,or present with extrarenal symptoms including retinal degeneration,cerebellar vermis hypoplasia,or hepatic *** are often diagnosed in early adolescence,reaching end-stage renal disease before 25 years of age,but early onset and rapidly progressive forms of NPHP-RC also exist.1 Renal ultrasound indicates kidneys of normal or reduced renal length with increased echogenicity and corticomedullary cysts.

关键词： degeneration urinary likely

Using occupancy models to determine mammalian responses to landscape changes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2009年第2期4卷 232-239页

作者： Jeremy m.NICHOLSON frank t.VAN mANEN Department of Forestry Wildlifeand FisheriesUniversity of TennesseeKnoxvilleTennesseeUSA US Geological Survey Southern Appalachian Research BranchUniversity of TennesseeKnoxvilleTennesseeUSA

Determining impacts of anthropogenic landscape changes on wildlife populations is *** the challengesDetermining impacts of anthropogenic landscape changes on wildlife populations is *** the challenges of designing field studies to document conditions before and after landscape changes occur,assessment of popula-of designing field studies to document conditions before and after landscape changes occur,assessment of popula-tion responses(*** in population density)often provide poor inference because of sampling *** responses(*** in population density)often provide poor inference because of sampling *** of occupancy,however,only requires data on detection or non-detection of a species and might provideEstimation of occupancy,however,only requires data on detection or non-detection of a species and might provide better *** demonstrate the utility of occupancy models,we used data from an American black bear(Ursusbetter *** demonstrate the utility of occupancy models,we used data from an American black bear(Ursus americanus Pallas)population in North Carolina,USA to test our research hypothesis that documented declines inamericanus Pallas)population in North Carolina,USA to test our research hypothesis that documented declines in site occupancy of black bears would be greater near a new four-lane *** used multi-season occupancysite occupancy of black bears would be greater near a new four-lane *** used multi-season occupancy models to estimate site occupancy based on bear visitation to survey sites before and after completion of the newmodels to estimate site occupancy based on bear visitation to survey sites before and after completion of the new highway and as a function of distance to the *** occupancy declined from 0.81 to 0.35 between the twohighway and as a function of distance to the *** occupancy declined from 0.81 to 0.35 between the two s

关键词： landscape changes mammalian responses occupancy models transportation infrastructure Ursus americanus.

Breakthrough in the challenging P450-catalyzed chemoenzymatic synthesis of C14-functionalized steroids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国科学:化学英文版 2023年第9期66卷 2435-2436页

作者： manfred t.Reetz frank Hollmann max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 145480 MülheimGermany tianjin Institute of Industrial Biotechnology Chinese Academy of SciencesTianjin 300308China Department of Biotechnology Delft Universityvan der Maasweg 92629 HZ DelftNetherlands

Intensive past research has demonstrated that cytochrome P450 monooxygenases are involved in the biosynthesis of numerous natural products and in human metabolism of various pharmaceuticals [1]. this inspired synthetic organic and pharmaceutical chemists to test them as catalysts in the oxidative hydroxylation of steroids. Unfortunately, wildtype P450s generally proved to show low levels of regio-and diastereoselectivity as well as suboptimal activity.

关键词： steroids catalyzed synthesis

HIV protease:late action to prevent immune detection

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

Signal transduction and targeted therapy 2021年第5期6卷 1408-1409页

作者： Konstantin m.J.Sparrer frank Kirchhoff Institute of molecular Virology Ulm University Medical CenterUlmGermany

A recent study published in Science by Wang and colleagues shows that premature activation of the HIV-1 protease leads to caspase activation and recruitment domain 8(CARD8)inflammasome-mediated pyroptosis of infected macrophages and CD4+t cells(Fig.1).these findings might help to improve approaches aiming to eliminate the latent viral reservoirs upon HIV-1 *** invading viral pathogens trigger the innate immune system and are usually rapidly controlled and eventually *** sense viral intruders via so-called pattern recognition receptors(PRRs)capable of detecting pathogen-associated molecular patterns(PAmPs)allowing discrimination between self and *** many cases,these patterns are viral nucleic acids that show pathogen-specific structures or emerge at the wrong localization in the ***,activation of PRRs by their respective ligands leads to the induction of various anti-viral signaling cascades,among them the inflammasome.

关键词： eventually action eliminate

Selective Suspension in Aqueous Sodium Dodecyl Sulfate According to Electronic Structure type Allows Simple Separation of metallic from Semiconducting Single-Walled Carbon Nanotubes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2009年第8期2卷 599-606页

作者： Kai moshammer frank Hennrich manfred m.Kappes Forschungszentrum Karlsruhe Institut für NanotechnologieD-76021 KarlsruheGermany Institut für Physikalische Chemie Universität KarlsruheD-76128 KarlsruheGermany

Both density gradient centrifugation and gel electrophoresis have been reported to allow high throughput separation of metallic from semiconducting single-walled carbon nanotubes(SWNts)when using aqueous sodium dodecyl sulphate(SDS)*** show here that both methods rely on an initial dispersion-by-sonication step,which is already selective with respect to electronic structure *** corresponding aqueous SDS“starting”suspensions obtained after sonication and purifi cation by simple centrifugation(70,000 g,1 h)contain semiconducting SWNts primarily in the form of small bundles whereas metallic SWNts are predominantly suspended as individual *** gradient centrifugation then separates the bundles from the individual tubes on the basis of differences in their overall buoyant *** electrophoresis separates the longer bundles from the shorter individual tubes on the basis of their different *** also demonstrate that such starting suspensions can be fractionated according to electronic structure type by even simpler techniques such as size exclusion chromatography or gel fi ltration,thus opening the way for simple scale-up.

关键词： Single-walled carbon nanotubes metallic–semiconducting separation electrophoresis density gradient centrifugation size exclusion chromatography

Growth of the tropical Pinus kesiya as influenced by climate and nutrient availability along an elevational gradient

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2020年第1期13卷 97-106页

作者： Le tuan Ho Raimund Schneider frank m.thomas Department of Geobotany University of TrierFaculty of Regional and Environmental SciencesBehringstraße 2154296 TrierGermany Department of Forest Resources management Faculty of ForestryNong Lam University HCMCThu Duc DistrictHo Chi Minh CityVietnam Department of Soil Science University of TrierFaculty of Regional and Environmental SciencesBehringstraße 2154296 TrierGermany

Aims In contrast to temperate regions,the reasons for growth reductions of individual tree species along elevational gradients in tropical mountain ranges are poorly known,especially for tropical *** aimed at testing whether climatic or edaphic conditions are responsible for the reduced growth of Pinus kesiya,a widely distributed pine species of southern and south-eastern Asia,at higher *** We analysed the stem diameter increment and the isotope discrimination against ^(13)C(△^(13)C)in tree rings of *** along an elevational gradient of~900 to~2000 m *** the mountain ranges of South-Central Vietnam,and related growth to△^(13)C and to climatic and edaphic *** findings We found no consistent correlation patterns between the basal area increment(BAI)of the trees and temperature or *** contrast,across the elevational gradient,we obtained significantly negative correlations of BAI with△^(13)C and with the C/N ratios and theδ^(15)N signature of the upper mineral *** was positively correlated with the concentrations of plant-available phosphorus(P_(a))and of“base”cations(calcium,magnesium,potassium)in the *** conclude that lower temperatures at higher elevations exert an indirect effect on tree growth by inducing higher C/N ratios and by reducing the rate of nitrogen(N)and P mineralization,which may be further hampered by lower concentrations of“base”cations(upon enhanced leaching by precipitation)and a negative feedback from low availability of mineralized N and P at higher *** results may be transferable to the uppermost growth limit of *** and to other montane regions of the species’occurrence.

关键词： dendroecology pine pointer year soil nutrient stable isotope