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Mechanisms of Organelle Inheritance in Dividing Plant Cells

Journal of Integrative Plant biology 2007年第8期49卷 1208-1218页

作者： Michael b Sheahan Ray J Rose david W McCurdy School of Environmental and Life Sciences The University of NewcastleCallaghan NSW 2308Australia Australian Research Council Centre of Excellence for Integrative Legume ResearchSchool of Environmental and Life SciencesThe University of NewcastleCallaghan NSW 2308Australia School of Environmental and Life Sciences The University of NewcastleCallaghan NSW 2308Australia

Organelles form essential compartments of all eukaryotic cells. Mechanisms that ensure the unbiased inheritance of organelles during cell division are therefore necessary to maintain the viability of future cell generations. Although inheritance of organelles represents a fundamental component of the cell cycle, surprisingly little is known about the underlying mechanisms that facilitate unbiased organelle inheritance. Evidence from a select number of studies, however, indicates that ordered organelle inheritance strategies exist in dividing cells of higher plants. The basic requirement for unbiased organelle inheritance is the duplication of organelle volume and distribution of the resulting organelle populations in a manner that facilitates unbiased partitioning of the organelle population to each daughter cell. Often, partitioning strategies are specific to the organelle, being influenced by the functional requirements of the organelle and whether the cells are mitotically active or re-entering into the cell cycle. Organelle partitioning mechanisms frequently depend on interactions with either the actin or microtubule cytoskeleton. In this focused review, we attempt to summarize key findings regarding organelle partitioning strategies in dividing cells of higher plants. We particularly concentrate on the role of the cytoskeleton in mediating unbiased organelle partitioning.

关键词： Actin cytoskeleton cell division green fluorescent protein-fimbrin AbD2 organelle partitioning protoplast

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Molecular cloning and differential expression patterns of the regulatory subunit b' gene of PP2A in goldfish,Carassius auratus

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Science China(Life Sciences) 2009年第8期52卷 724-732页

作者： LI david WanCheng Key Laboratory of Protein Chemistry & Developmental biology of Education Ministry of China College of Life SciencesHunan Normal University Department of biochemistry and Molecular biology College of MedicineUniversity of Nebraska Medical Center Department of Ophthalmology and Visual Sciences College of MedicineUniversity of Nebraska Medical Center

It is well established that the protein serine/threonine phosphatase 2A(PP2A) plays very important roles in many different cellular processes,including cell proliferation and differentiation,gene expression,neurotransmission,apoptosis,and ***2A consists of three heterogenic subunits:the scaffold subunit A,the catalytic subunit C,and the regulatory subunit *** both the scaffold and the catalytic subunits contain only two forms,at least four families of the regulatory subunits,b,b',b'',and b''' have been *** regulatory subunits from different families are encoded by different genes and bear other functions besides directing the specificity of *** study the functions of the regulatory subunits of PP2A in lower vertebrates,we have cloned the full-length cDNA sequence of the gene encoding the regulatory subunit b'δ of PP2A from gold fish,Carassius auratus using 3'-RACE and 5'-RACE cloning *** results revealed that the full-length b'δ cDNA contains 2415 bp and encodes a protein of 555 amino *** b'δ protein displays a very high level of sequence identity with the b'δ regulatory subunit from other species of *** its expression pattern,RT-PCR revealed that the highest level of mRNA was detected in brain,a less level detected in liver,spermary,ovary,kidney and gill,and the lowest level detected in the *** different developmental stages of gold fish,the highest level of mRNA expression was detected at the stages of two-cell,multiple-cell,blastula and gastrula,and a decreased level of b'δ mRNA was detected in other developmental *** the protein level,the highest expression level of b'δ protein was found in spermary,ovary,brain and heart,a less amount found in liver and the lowest level detected in kidney,gill and ***,b'δ protein was strongly expressed at the stages of two-cell,multiple-cell,blastula,gastrula,neurula,and optic vesicle,and then decreased at the stages of brain differentiatio

关键词： PP2A Protein dephosphorylation PP2A-b’δ regulatory subunit.

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Enhanced Hoek-brown(H-b)criterion for rocks exposed to chemical corrosion

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International Journal of Mining Science and Technology 2024年第5期34卷 609-630页

作者： Hao Li Leo Pel Zhenjiang You david Smeulders Department of Mechanical Engineering Eindhoven University of TechnologyEindhoven 5600 MBthe Netherlands Department of Applied Physics Eindhoven University of TechnologyEindhoven 5600 MBthe Netherlands Center for Sustainable Energy and Resources School of EngineeringEdith Cowan UniversityJoondalupWA 6027Australia School of Chemical Engineering The University of QueenslandBrisbaneQLD 4072Australia Gas and Energy Transition Research Centre The University of QueenslandBrisbaneQLD 4072Australia

Underground constructions often encounter water environments,where water–rock interaction can increase porosity,thereby weakening engineering ***,the failure criterion for chemically corroded rocks becomes essential in the stability analysis and design of such *** study enhances the applicability of the Hoek-brown(H-b)criterion for engineering structures operating in chemically corrosive conditions by introducing a kinetic porosity-dependent instantaneous mi(KPIM).A multiscale experimental investigation,including nuclear magnetic resonance(NMR),X-ray diffraction(XRD),scanning electron microscopy(SEM),pH and ion chromatography analysis,and triaxial compression tests,is employed to quantify pore structural changes and their linkage with the strength responses of limestone under coupled chemical-mechanical(C-M)*** employing ion chromatography and NMR analysis,along with incorporating the principles of free-face dissolution theory accounting for both congruent and incongruent dissolution,a kinetic chemical corrosion model is *** model aims to calculate the kinetic porosity alterations within rocks exposed to varying H+concentrations and ***,utilizing the generalized mixture rule(GMR),the kinetic porositydependent mi is *** of the KPIM-enhanced H-b criterion using compression test data from 5 types of rocks demonstrated a high level of consistency between the criterion and the experimental results,with a coefficient of determination greater than 0.96,a mean absolute percentage error less than 4.84%,and a root-mean-square deviation less than 5.95 ***,the physical significance of the porosity-dependent instantaneous mi is clarified:it serves as an indicator of a rock’s capacity to leverage the confining pressure effect.

关键词： Hoek-brown(H-b)criterion Instantaneous mi Kinetic porosity-dependency Chemical corrosion Compressive strength

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Classic axon guidance molecules control correct nerve bridge tissue formation and precise axon regeneration

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Neural Regeneration Research 2020年第1期15卷 6-9页

作者： Xin-Peng Dun david bParkinson Faculty of Medicine and Dentistry Plymouth UniversityPlymouthDevonUK The Co-Innovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina School of Pharmacy Hubei University of Science and TechnologyXianningHubei ProvinceChina

The peripheral nervous system has an astonishing ability to regenerate following a compression or crush injury;however,the potential for full repair following a transection injury is much ***,the major clinical challenge for peripheral nerve repair come from long gaps between the proximal and distal nerve stumps,which prevent regenerating axons reaching the distal *** axon targeting during nervous system development is controlled by families of axon guidance molecules including Netrins,Slits,Ephrins and *** recent studies have indicated key roles of Netrin1,Slit3 and Ephrinb2 signalling in controlling the formation of new nerve bridge tissue and precise axon regeneration after peripheral nerve transection *** the nerve bridge,nerve fibroblasts express Ephrinb2 while migrating Schwann cells express the receptor ***2/Ephb2 signalling between nerve fibroblasts and migrating Schwann cells is required for Sox2 upregulation in Schwann cells and the formation of Schwann cell cords within the nerve bridge to allow directional axon growth to the distal nerve *** in the outermost layer of the nerve bridge express Slit3 while migrating Schwann cells and regenerating axons express the receptor Robo1;within Schwann cells,Robo1 expression is also ***3/Robo1 signalling is required to keep migrating Schwann cells and regenerating axons inside the nerve *** addition to the Slit3/Robo1 signalling system,migrating Schwann cells also express Netrin1 and regenerating axons express the DCC *** appears that migrating Schwann cells could also use Netrin1 as a guidance cue to direct regenerating axons across the peripheral nerve *** neural tissues have been suggested as promising alternatives for the repair of large peripheral nerve ***,understanding the function of classic axon guidance molecules in nerve bridge formation and their roles in axon regeneration could be h

关键词： axonal guidance Ephrinb2 nerve bridge Netrin1 peripheral nerve regeneration Slit3 Sox2 transection injury

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Type 2 autoimmune pancreatitis associated with severe ulcerative colitis: Three case reports

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World Journal of Clinical Cases 2022年第24期10卷 8788-8796页

作者： Mark Ghali Karen bensted david b Williams Simon Ghaly Department of Gastroenterology St Vincent's HospitalDarlinghurst 2010NSWAustralia School of Clinical Medicine Faculty of Medicine and HealthThe University of New South WalesSydney 1466NSWAustralia

bACKGROUND Type two autoimmune pancreatitis is a rare and difficult to diagnose,steroid responsive non-IgG4 inflammatory pancreatopathy that can be associated with inflammatory bowel *** SUMMARY This case series describes three cases with varied clinical presentations and representations of autoimmune pancreatitis,and all associated with an aggressive course of ulcerative *** pancreatopathy was independent of bowel disease activity and developed in one case following *** Clinician awareness about this condition is important to allow early diagnosis,treatment and avoid unnecessary pancreatic surgery.

关键词： Autoimmune pancreatitis Inflammatory bowel disease Ulcerative colitis Colectomy Case report

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Physiological and Growth Responses of C_3 and C_4 Plants to Reduced Temperature When Grown at Low CO_2 of the Last Ice Age

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Journal of Integrative Plant biology 2008年第11期50卷 1388-1395页

作者： Joy K.Ward david A.Myers Richard b.Thomas Department of Ecology and Evolutionary biology University of Kansas Department of biology West Virginia University

During the last ice age, CO2 concentration （[CO2]） was 180-200 umol/mol compared with the modern value of 380 umol/mol, and global temperatures were -8 ℃ cooler. Relatively little is known about the responses of C3 and C4 species to longterm exposure to glacial conditions. Here Abutilon theophrasti Medik. （C3） and Amaranthus retroflexus L. （C4） were grown at 200 umol/mol CO2 with current （30/24℃） and glacial （22/16℃） temperatures for 22d. Overall, the C4 species exhibited a large growth advantage over the C3 species at low [CO2]. However, this advantage was reduced at low temperature, where the C4 species produced 5x the total mass of the C3 species versus 14x at the high temperature. This difference was due to a reduction in C4 growth at low temperature, since the C3 species exhibited similar growth between temperatures. Physiological differences between temperatures were not detected for either species, although photorespiration/net photosynthesis was reduced in the C3 species grown at low temperature, suggesting evidence of improved carbon balance at this treatment. This system suggests that C4 species had a growth advantage over C3 species during low [CO2] of the last ice age, although concurrent reductions in temperatures may have reduced this advantage.

关键词： Abutilon theophrasti Amaranthus retroflexus C3 species C4 species climate change low CO2 low temperature photorespiration Pleistocene.

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Two-Factor Cancelable biometrics Authenticator

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Journal of Computer Science & Technology 2007年第1期22卷 54-59页

作者：彭颖涵 Andrew T. b. J david N. C. L Faculty of Information Science and Technology Multimedia University dalan Ayev Keroh Lama 75450 Melaka Malaysia

biometrics-based authentication system offers advantages of providing high reliability and accuracy. However the contemporary authentication system is impuissance to compromise. If a biometrics data is compromised, it cannot be replaced and rendered unusable. In this paper, a cancelable biometrics-based authenticator is proposed to solve this irrevocability issue. The proposed approach is a two-factor authentication system, which requires both of the random data and facial feature in order to access the system. In this system, tokenized pseudo-random data is coupled with momentbased facial feature via inner product algorithm. The output of the product is then discretized to generate a set of private binary code, coined as 2factor-Hashing code, which is acted as verification key. If this biometrics-based verification key is compromised, a new one can be issued by replacing a different set of random number via token replacement. Then, the compromised one is rendered completely useless. This feature offers an extra protection layer against biometrics fabrication since the verification code is replaceable. Experimental results demonstrate that the proposed system provides zero Equal Error Rate in which there is a clear separation in between the genuine and the imposter distribution populations.

关键词： cancelable biometrics face recognition Geometric moments,pseudo Zernike moment

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A metabolic signalling role for arginine in liver cancer

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Life Metabolism 2024年第1期3卷 1-3页

作者： david Sokolov Lucas b.Sullivan Human biology Division Fred Hutchinson Cancer CenterSeattleWA 98109United States

In addition to their canonical roles in biosynthetic pathways,metabolites can be active participants in oncogenic signal-ling,but our understanding of these signalling mechanisms is *** a recent article published in Cell,Mossmann et *** a novel signalling role for accumulated arginine in hepato-cellular carcinoma(HCC)mediated by the RNA splicing factor and transcriptional modifier RNA-binding protein 39(RbM39).

关键词： incomplete cancer

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Growth rates of Eucalyptus and other Australian native tree species derived from seven decades of growth monitoring

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Journal of Forestry Research 2015年第4期26卷 811-826页

作者： Michael R.Ngugi david Doley Mark Cant Daniel b.botkin Ecological Sciences Queensland HerbariumDepartment of ScienceInformation Technology and InnovationQueensland Government Centre for Mined Land Rehabilitation Sustainable Minerals InstituteThe University of Queensland Technical Services Pest ManagementDepartment of National ParksRecreationSport and RacingQueensland Government Department of biology University of Miami

There is widespread interest in estimating and forecasting individual tree and forest growth rates for restoration and carbon sequestration objectives. Outside intensively managed forests, past attempts have been limited by the lack of accurate long-term monitoring in multi-age mixed native forests to provide estimates of both expected mean diameter increments and the statistical variation in those estimates. A dataset from Eucalyptus-dominated native forests in subtropical Queensland, Australia offers an opportunity to provide accurate estimates of tree and forest growth rates. Over 86,400 trees from 155 native species were identified and remeasured between 1936 and 2011 in 641 permanent sample plots across a 500-2000 mm mean annual rainfall gradient. Individual tree diameter at breast height （DbH） increments observed for all species ranged mainly from 0.01 to 0.5 cm yr-1 （94 % of values）, with consistentdifferences between rainfall zones （mean of 500- 2000 mm yr-1）, and varying differences between species （155） and stem diameter class （10-100 cm）. For some spe- cies, diameter increment increased progressively with rain- fall （e.g. Eucalyptus siderophloia, Eucalyptus propinqua, and Lophostemon confertus）, but in others （e.g. Corymbia citriodora subsp, variegata, Corymbia intermedia, and Eucalyptus biturbinata） the greatest diameter increments were recorded between 1200 and 1600 mm yr-1. Where there were sufficient data, most species exhibited a quadratic relationship between DbH increment and DbH class, but two species （ Callitris glaucophylla and Eucalyptus crebra） native to the 500-800 mm annual rainfall zone showed lin- ear increases in DbH increment with increasing DbH. Continued monitoring of these plots would add to their already great value.

关键词： Diameter increments Ecological restoration Forest management Eucalypt forests Natural forests

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Astronomical time scale for the lower Doushantuo Formation of early Ediacaran,South China

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Science bulletin 2018年第22期63卷 1485-1494页

作者： Yu Sui Chunju Huang Rui Zhang Zhixiang Wang James Ogg david b.Kemp State Key Laboratory of biogeology and Environmental Geology School of Earth SciencesChina University of GeosciencesWuhan 430074China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Department of Earth Atmospheric and Planetary SciencesPurdue UniversityWest LafayetteIN 47907USA School of Geosciences University of AberdeenAberdeenScotland AB243UEUK

Nearly 90% of the Ediacaran Period(635–541 Ma) of the Neoproterozoic is represented by the Doushantuo Formation(DST Fm) in South *** lowest Member I is a 3.7 m-thick cap carbonate deposited at the termination of the Cryogenian Marinoan *** DST Fm consists of alternating organic-rich black shale and thinly bedded dolostone, and it contains some of the oldest records of multicellular life and three pronounced negative carbon isotope *** Jiulongwan(JLW) section is a well-studied reference section for these Ediacaran *** analysis of geochemical data through the lower DST Fm(22.3 m) shows 27 predominant ～90 cm sedimentary cycles that correspond to 405-ka long eccentricity *** power spectra of the 405-ka tuned Ca and Fe/Ti series show significant peaks at ～1.2-Ma, 405-ka, 133-ka, 128-ka, 100-ka, 82-ka, ～31-ka and 29-ka periods, respectively.A 11.16 Malong astronomical time scale has been constructed for the lower DST Fm and provide a duration of 1.6 Ma for the cap carbonate(Member Ⅰ) based on the 405-ka long eccentricity cycle *** the U-Pb age of 635.2 ± 0.6 Ma for the volcanic ash bed at the Member Ⅰ/Ⅱboundary, we proposed a 636.8 Ma age for the base of the DST *** ages and astronomical timescale provide important new constraints on the subdivision of Ediacaran strata, and have implications for understanding the character of the first negative δ^(13)C excursion(EN1).Orbital forcing may have been played an important role for the climate changes and the evolution of Ediacaran multi-cellular life and the carbon cycle variations.

关键词： Ediacaran Doushantuo Formation Astronomical time scale Orbital forcing Jiulongwan section

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