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Cold adaptation does not alter ATP homeostasis during cold exposure in Drosophila melanogaster

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Integrative Zoology 2018年第4期13卷 471-481页

作者： Caroline M.WILLIAMS James R.ROCCA Arthur S.EDISON David B.ALLISON Theodore J.MORGAN daniel A.hahn Department of Integrative Biology University of CaliforniaBerkeleyCaliforniaUSA Departments of Entomology and Nematology University of FloridaGainesvilleFloridaUSA Biochemistry University of FloridaGainesvilleFloridaUSA Advanced Magnetic Resonance Imaging and Spectroscopy Facility McKnight Brain InstituteUniversity of FloridaGainesvilleFloridaUSA Departments of Genetics and Biochemistry Complex Carbohydrate Research CenterUniversity of GeorgiaAthensGeorgiaUSA Department of Epidemiology and Biostatistics School of Public HealthIndiana University BloomingtonBloomingtonIndianaUSA Division of Biology Kansas State UniversityManhattanKansasUSA

In insects and other ectotherms,cold temperatures cause a coma resulting from loss of neuromuscular function,during which ionic and metabolic homeostasis are progressively *** adaptation improves homeostasis during cold exposure,but the ultimate targets of selection are still an open *** acclimation and adaptation remodels mitochondrial metabolism in insects,suggesting that aerobic energy production during cold exposure could be a target of ***,we test the hypothesis that cold adaptation improves the ability to maintain rates of aerobic energy production during cold exposure by using^(31)P NMR on live *** lines of Drosophila melanogaster artificially selected for fast and slow recovery from a cold coma,we show that cold exposure does not lower ATP levels and that cold adaptation does not alter aerobic ATP production during cold ***-hardy and cold-susceptible lines both experienced a brief transition to anaerobic metabolism during cooling,but this was rapidly reversed during cold exposure,suggesting that oxidative phosphorylation was sufficient to meet energy demands below the critical thermal minimum,even in cold-susceptible *** thus reject the hypothesis that performance under mild low temperatures is set by aerobic ATP supply limitations in ***,excluding oxygen and capacity limitation as a weak link in energy *** work suggests that the modulations to mitochondrial metabolism resulting from cold acclimation or adaptation may arise from selection on a biosynthetic product(s)of those pathways rather than selection on ATP supply during cold exposure.

关键词： chill coma energetics insect oxygen limitation thermal tolerance

Spatial heterogeneity of flesh-cell osmotic potential in sweet cherry affects partitioning of absorbed water

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Horticulture Research 2020年第1期7卷 2104-2113页

作者： Eckhard Grimm daniel Pflugfelder Jan hahn Moritz Jonathan Schmidt Hendrik Dieckmann Moritz Knoche Institut für Gartenbauliche Produktionssysteme Leibniz Universität HannoverAbteilung ObstbauHerrenhäuser Straße 2D-30419 HannoverGermany Forschungszentrum Jülich IBG-2:PflanzenwissenschaftenWilhelm-Johnen-StraßeD-52428 JülichGermany Laser Zentrum Hannover e.V. Hollerithallee 8D-30419 HannoverGermany

A fleshy fruit is commonly assumed to resemble a thin-walled pressure vessel containing a homogenous carbohydrate *** sweet cherry(Prunus avium L.)as a model system,we investigate how local differences in cell water potential affect H2O and D2O(heavy water)*** partitioning of H2O and D2O was mapped nondestructively using magnetic resonance imaging(MRI).The change in size of mesocarp cells due to water movement was monitored by optical coherence tomography(OCT,non-destructive).Osmotic potential was mapped using microosmometry(destructive).Virtual sections through the fruit revealed that the H2O distribution followed a net pattern in the outer mesocarp and a radial pattern in the inner *** patterns align with the disposition of the vascular bundles.D2O uptake through the skin paralleled the acropetal gradient in cell osmotic potential gradient(from less negative to more negative).Cells in the vicinity of a vascular bundle were of more negative osmotic potential than cells more distant from a vascular *** revealed net H2O uptake was the result of some cells loosing volume and other cells increasing volume.H2O and D2O partitioning following uptake is non-uniform and related to the spatial heterogeneity in the osmotic potential of mesocarp cells.

关键词： potential Spatial bundle

Establishment of Withania somnifera Hairy Root Cultures for the Production of Withanolide A

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Journal of Integrative Plant Biology 2008年第8期50卷 975-981页

作者： Hosakatte N. Murthy Camelia Dijkstra Paul Anthony daniel A. White Mike R. Davey J. Brian Power Eun J. hahn Kee Y. Paek Plant Sciences Division School of Biosciences University of Nottingham Sutton Bonington Campus Loughborough LE12 5RD UK Department of Botany Karnatak University Dharwad 580 003 India Research Center for the Development of Advanced Horticultural Technology Chungbuk National University Cheongju 361-763 Korea Department of Botany Karnatak University Dharwad 580 003 India Food Sciences Division School of Biosciences University of Nottingham Sutton Bonington Campus Loughborough LE12 5RD UK Research Center for the Development of Advanced Horticultural Technology Chungbuk National University Cheongju 361-763 Korea

Withania sominifera （Indian ginseng） was transformed by Agrobacterium rhizogenes. Explants from seedling roots, stems, hypocotyls, cotyledonary nodal segments, cotyledons and young leaves were inoculated with A. rhizogenes strain R1601. Hairy （transformed） roots were induced from cotyledons and leaf explants. The transgenic status of hairy roots was confirmed by polymerase chain reaction using nptll and rolB specific primers and, subsequently, by Southern analysis for the presence of nptll and rolB genes in the genomes of transformed roots. Four clones of hairy roots were established; these differed in their morphology. The doubling time of faster growing cultures was 8-14 d with a fivefold increase in biomass after 28 d compared with cultured, non-transformed seedling roots. MS-based liquid medium was superior for the growth of transformed roots compared with other culture media evaluated （SH, LS and N6）, with MS-based medium supplemented with 40 g/L sucrose being optimal for biomass production. Cultured hairy roots synthesized withanolide A, a steroidal lactone of medicinal and therapeutic value. The concentration of withanolide A in transformed roots （157.4 μg/g dry weight） was 2.7-fold more than in non-transformed cultured roots （57.9 μg/g dry weight）.

关键词： Agrobacterium rhizogenes hairy (transformed) roots Indian ginseng transformation withanolide A

Localized bursting of mesocarp cells triggers catastrophic fruit cracking

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Horticulture Research 2019年第1期6卷 764-773页

作者： Eckhard Grimm Jan hahn daniel Pflugfelder Moritz Jonathan Schmidt Dagmar van Dusschoten Moritz Knoche Abteilung Obstbau Institut für Gartenbauliche ProduktionssystemeLeibniz Universität HannoverHerrenhäuser Straße 230419 HannoverGermany Laser Zentrum Hannover e.V. Hollerithallee 830419 HannoverGermany IBG-2:Grimm et al.Horticulture Research(2019)6:79 Page 9 of 10 Pflanzenwissenschaften Forschungszentrum JülichWilhelm-Johnen-Straße52428 JülichGermany

The so-called rain-cracking of sweet cherry fruit severely threatens commercial *** observation tells us that cuticular microcracking(invisible)always precedes skin macrocracking(visible).The objective here was to investigate how a macrocrack *** detached sweet cherry fruit in deionized water induces *** fruit in D2O and concurrent magnetic resonance imaging demonstrates that water penetration occurs only(principally)through the microcracks,with nondetectable amounts penetrating the intact *** coherence tomography of detached,whole fruit incubated in deionized water,allowed generation of virtual cross-sections through the zone of a developing *** mesocarp cell volume increased before macrocracks developed but increased at a markedly higher rate *** change in mesocarp cell volume occurred in a control zone distant from the *** water incubation continued,the cell volume in the crack zone decreased,indicating leaking/bursting of individual mesocarp *** incubation continued still longer,the crack propagated between cells both to form a long,deep *** mesocarp cell turgor did not differ significantly before and after incubation between fruit with or without macrocracks;nor between cells within the crack zone and those in a control zone distant from the *** cumulative frequency distribution of the logtransformed turgor pressure of a population of outer mesocarp cells reveals all cell turgor data followed a normal *** results demonstrate that microcracks develop into macrocracks following the volume increase of a few outer mesocarp cells and is soon accompanied by cell bursting.

关键词： markedly cracking continued

Observation of a single protein by ultrafast X-ray diffraction

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Light(Science & Applications) 2024年第1期13卷 80-90页

作者： Tomas Ekeberg Dameli Assalauova Johan Bielecki Rebecca Boll Benedikt J.Daurer Lutz A.Eichacker Linda E.Franken Davide E.Galli Luca Gelisio Lars Gumprecht Laura H.Gunn Janos Hajdu Robert Hartmann Dirk Hasse Alexandr Ignatenko Jayanath Koliyadu Olena Kulyk Ruslan Kurta Markus Kuster Wolfgang Lugmayr Jannik Lübke Adrian P.Mancuso Tommaso Mazza Carl Nettelblad Yevheniy Ovcharenko daniel E.Rivas Max Rose Amit K.Samanta Philipp Schmidt Egor Sobolev Nicusor Timneanu Sergey Usenko daniel Westphal Tamme Wollweber Lena Worbs Paul Lourdu Xavier Hazem Yousef Kartik Ayyer Henry N.Chapman Jonas A.Sellberg Carolin Seuring Ivan A.Vartanyants Jochen Küpper Michael Meyer Filipe R.N.C.Maia Laboratory of Molecular Biophysics Department of Cell and Molecular BiologyUppsala UniversityHusargatan 3(Box 596)SE-75124 UppsalaSweden Deutsches Electronen-Synchrotron DESY Notkestrasse 8522607 HamburgGermany European XFEL Holzkoppel 422869 SchenefeldGermany Diamond Light Source Harwell Science&Innovation CampusDidcot OX110DEUK University of Stavanger Centre Organelle ResearchRichard-Johnsensgate 44021 StavangerNorway Leibniz Institute for Experimental Virology(HPI) Centre for Structural Systems BiologyNotkestraße 8522607 HamburgGermany Dipartimento di Fisica“Aldo Pontremoli” Universitàdegli Studi di Milanovia Celoria 1620133 MilanoItaly Center for Free-Electron Laser Science DESY22607 HamburgGermany Plant Biology Section School of Integrative Plant ScienceCornell UniversityIthacaNY 14853USA PNSensor GmbH Otto-Hahn-Ring 6D-81739 MünchenGermany Biomedical and X-Ray Physics Department of Applied PhysicsAlbaNova University CenterKTH Royal Institute of TechnologySE-10691 StockholmSweden ELI Beamlines/IoP Institute of Physics AS CR v.v.i.Na Slovance 218221 Prague 8Czech Republic Multi-User CryoEM Facility Centre for Structural Systems BiologyNotkestr.8522607 HamburgGermany University Medical Center Hamburg-Eppendorf(UKE) Martinistrasse 5220246 HamburgGermany The Hamburg Center for Ultrafast Imaging Universität HamburgLuruper Chaussee 14922761 HamburgGermany Department of Physics Universität HamburgLuruper Chaussee 14922761 HamburgGermany Department of Chemistry and Physics La Trobe Institute for Molecular ScienceLa Trobe UniversityMelbourneVIC 3086Australia Division of Scientific Computing Science for Life LaboratoryDepartment of Information TechnologyUppsala UniversityBox 337SE-75105 UppsalaSweden European Molecular Biology Laboratory c/o DESYNotkestrasse 8522607 HamburgGermany Department of Physics and Astronomy Uppsala UniversityBox 516SE-75120 UppsalaSweden Max Planck Institute for the Structure and Dynamics of Matter Luruper Chaussee 14922761 HamburgGe

The idea of using ultrashort X-ray pulses to obtain images of single proteins frozen in time has fascinated and inspired *** was one of the arguments for building X-ray free-electron *** to theory,the extremely intense pulses provide sufficient signal to dispense with using crystals as an amplifier,and the ultrashort pulse duration permits capturing the diffraction data before the sample inevitably *** was first demonstrated on biological samples a decade ago on the giant *** then,a large collaboration has been pushing the limit of the smallest sample that can be *** ability to capture snapshots on the timescale of atomic vibrations,while keeping the sample at room temperature,may allow probing the entire conformational phase space of *** we show the first observation of an X-ray diffraction pattern from a single protein,that of Escherichia coli GroEL which at 14 nm in diameter is the smallest biological sample ever imaged by X-rays,and demonstrate that the concept of diffraction before destruction extends to single *** the pattern,it is possible to determine the approximate orientation of the *** experiment demonstrates the feasibility of ultrafast imaging of single proteins,opening the way to single-molecule time-resolved studies on the femtosecond timescale.

关键词： smallest intense ultrafast

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光动力疗法治疗非小细胞肺癌

国际病理科学与临床杂志 2013年第3期33卷 185-197页

作者： Charles B Simone II Joseph S Friedberg Eli Glatstein James P Stevenson daniel H Sterman Stephen M hahn Keith A Cengel 袁光金李金銮朱宇熹凌扬 Department of Radiation Oncology Department of Surgery Division of Thoracic Surgery Department of Medicine Division ofMedical Oncology Department of Medicine Division of PulmonaryAllergy and Critical CareHospital of the University of PennsylvaniaPhiladelphiaPAUSA 解放军第82医院肿瘤内科江苏淮安215008 福建省肿瘤医院放疗科福州350014 重庆医科大学附一院肿瘤科重庆400042 日本京都大学附属病院放射性肿瘤科苏州大学附属常州肿瘤医院肿瘤内科常州江苏213001

光动力疗法被越来越多地应用于治疗胸部恶性肿瘤。对于早期非小细胞肺癌(如支气管腔内肺癌)、X线检查阴性或同时性原发癌,光动疗法可作为主要治疗手段进行腔内根治性治疗。作为单一根治疗法,光动力疗法是治疗支气管镜可见≤1 cm且无软... 详细信息

光动力疗法被越来越多地应用于治疗胸部恶性肿瘤。对于早期非小细胞肺癌(如支气管腔内肺癌)、X线检查阴性或同时性原发癌,光动疗法可作为主要治疗手段进行腔内根治性治疗。作为单一根治疗法,光动力疗法是治疗支气管镜可见≤1 cm且无软骨外浸润的肺部肿瘤的最有效方法。对于晚期非小细胞癌患者,光动力治疗可以作为综合根治疗法的一部分,用于减轻阻塞性支气管内病变,增加可手术性或缩小所需手术范围。本文对现有发表的应用光动力疗法治疗至少10例以上非小细胞肺癌病例的研究文献进行综述,提出了光动力疗法应用的治疗建议并进行了总结。

关键词：光动力疗法肺癌支气管内姑息疗法非小细胞肺癌

Eliminating viscosity bias in lateral flow tests

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Microsystems & Nanoengineering 2021年第5期7卷 195-204页

作者： daniel M.Kainz Bastian J.Breiner Susanna M.Fruh Tobias Hutzenlaub Roland Zengerle Nils Paust Laboratory for MEMS Applications IMTEK-Department of Microsystems EngineeringUniversity of FreiburgGeorges-Koehler-Allee 10379110 FreiburgGermany hahn-Schickard Georges-Koehler-Allee 10379110 FreiburgGermany

Despite the widespread application of point-of-care lateral flow tests,the viscosity dependence of these assay results remains a significant ***,we employ centrifugal microfluidic flow control through the nitrocellulose membrane of the strip to eliminate the viscosity *** key feature is the balancing of the sample flow into the cassette of the lateral flow test with the air flow out of the cassette.A viscosity-indepen3ent flow rate of 3.01±0.18 min(±6%)is demonstrated for samples with viscosities ranging from 1.1 mPas to 24 mPas,a factor greater than *** a model human IgG lateral flow assay,signal-intensity shifts caused by varying the sample viscosity from 1.1 mPas to 23 mPas could be reduced by more than 84%.

关键词： viscosity flow eliminate

finDr:A web server for in silico D-peptide ligand identification

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Synthetic and Systems Biotechnology 2021年第4期6卷 402-413页

作者： Helena Engel Felix Guischard Fabian Krause Janina Nandy Paulina Kaas Nico Hofflin Maja Kohn Normann Kilb Karsten Voigt Steffen Wolf Tahira Aslan Fabian Baezner Salom´e hahne Carolin Ruckes Joshua Weygant Alisa Zinina Emir Bora Akmeriç Enoch B.Antwi Dennis Dombrovskij Philipp Franke Klara L.Lesch Niklas Vesper daniel Weis Nicole Gensch Barbara Di Ventura Mehmet Ali Oztürk Signalling Research Centres BIOSS and CIBSS University of FreiburgSchanzlestr.1879104FreiburgGermany Institute of Biology III Faculty of BiologyUniversity of FreiburgSchanzlestr.179104FreiburgGermany Institute of Biology II Faculty of BiologyUniversity of FreiburgSchanzlestr.179104FreiburgGermany AG Roth-Lab for MicroarrayCopying ZBSA-Centre for Biological Systems AnalysisUniversity of FreiburgHabsburgerstrasse 4979104FreiburgGermany Biomolecular Dynamics Institute of PhysicsUniversity of FreiburgHermann-Herder-Strasse 3a79104FreiburgGermany Core Facility Signalling Factory Centre for Biological Signaling Studies(BIOSS)University of FreiburgSchanzlestr.1879104FreiburgGermany Spemann Graduate School of Biology and Medicine(SGBM) University of FreiburgAlbertstraße 19A79104FreiburgGermany Internal Medicine IV Department of MedicineMedical CenterUniversity of FreiburgHugstetter Straße 5579106FreiburgGermany Institute for Biochemistry University of FreiburgAlbertstr.2179104FreiburgGermany

In the rapidly expanding field of peptide therapeutics,the short in vivo half-life of peptides represents a considerable limitation for drug action.D-peptides,consisting entirely of the dextrorotatory enantiomers of naturally occurring levorotatory amino acids(AAs),do not suffer from these shortcomings as they are intrinsically resistant to proteolytic degradation,resulting in a favourable pharmacokinetic *** experimentally identify D-peptide binders to interesting therapeutic targets,so-called mirror-image phage display is typically performed,whereby the target is synthesized in D-form and L-peptide binders are screened as in conventional phage *** technique is extremely powerful,but it requires the synthesis of the target in D-form,which is challenging for large *** we present finDr,a novel web server for the computational identification and optimization of D-peptide ligands to any protein structure(https://***/).finDr performs molecular docking to virtually screen a library of helical 12-mer peptides extracted from the RCSB Protein Data Bank(PDB)for their ability to bind to the *** a separate,heuristic approach to search the chemical space of 12-mer peptides,finDr executes a customizable evolutionary algorithm(EA)for the de novo identification or optimization of D-peptide *** a proof of principle,we demonstrate the validity of our approach to predict optimal binders to the pharmacologically relevant target phenol soluble modulin alpha 3(PSMα3),a toxin of methicillin-resistant Staphylococcus aureus(MRSA).We validate the predictions using in vitro binding assays,supporting the success of this *** to conventional methods,finDr provides a low cost and easy-to-use alternative for the identification of D-peptide ligands against protein targets of choice without size *** believe finDr will facilitate D-peptide discovery with implications in biotechnology and biomedicine.

关键词： D-peptide Web server Evolutionary algorithm Peptide design Molecular docking Mirror-image phage display