Gotowe bibliografie tematyczne / Human cell types

Gotowa bibliografia na temat „Human cell types”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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Artykuły w czasopismach na temat "Human cell types"

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Liu, Zedao, i Zemin Zhang. "Mapping cell types across human tissues". Science 376, nr 6594 (13.05.2022): 695–96. http://dx.doi.org/10.1126/science.abq2116.

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Grünert, Ulrike, i Paul R. Martin. "Cell types and cell circuits in human and non-human primate retina". Progress in Retinal and Eye Research 78 (wrzesień 2020): 100844. http://dx.doi.org/10.1016/j.preteyeres.2020.100844.

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Bernstein, Matthew N., i Colin N. Dewey. "Annotating cell types in human single-cell RNA-seq data with CellO". STAR Protocols 2, nr 3 (wrzesień 2021): 100705. http://dx.doi.org/10.1016/j.xpro.2021.100705.

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Canals, Isaac, Ella Quist i Henrik Ahlenius. "Transcription Factor-Based Strategies to Generate Neural Cell Types from Human Pluripotent Stem Cells". Cellular Reprogramming 23, nr 4 (1.08.2021): 206–20. http://dx.doi.org/10.1089/cell.2021.0045.

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Kenney, M. Christina, Marilyn Chwa, Brian Lin, Gang-Hua Huang, Alexander V. Ljubimov i Donald J. Brown. "Identification of Cell Types in Human Diseased Corneas". Cornea 20, nr 3 (kwiecień 2001): 309–16. http://dx.doi.org/10.1097/00003226-200104000-00014.

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Butterworth, R. J., W. Jones-Williams i L. E. Hughes. "Quantification of cell types in human granulation tissue". Journal of Wound Care 1, nr 4 (2.11.1992): 32–33. http://dx.doi.org/10.12968/jowc.1992.1.4.32.

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Neumann, V., F. Siegemund i B. Bae�ler. "Electrically induced fusion of different human cell types". Journal of Neurology 233, nr 3 (czerwiec 1986): 153–56. http://dx.doi.org/10.1007/bf00314422.

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Jabari, Samir, Falk Schrödl, Alexandra Kaser-Eichberger, Barbara Kofler i Axel Brehmer. "Alarin in different human intestinal epithelial cell types". Histochemistry and Cell Biology 151, nr 6 (5.01.2019): 513–20. http://dx.doi.org/10.1007/s00418-018-1763-9.

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Hermann, Andreas, Martina Maisel, Stefan Liebau, Manfred Gerlach, Alexander Kleger, Johannes Schwarz, Kwang-Soo Kim, Gregor Antoniadis, Holger Lerche i Alexander Storch. "Mesodermal cell types induce neurogenesis from adult human hippocampal progenitor cells". Journal of Neurochemistry 98, nr 2 (lipiec 2006): 629–40. http://dx.doi.org/10.1111/j.1471-4159.2006.03916.x.

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Trounson, Alan. "Human embryonic stem cells: mother of all cell and tissue types". Reproductive BioMedicine Online 4 (styczeń 2002): 58–63. http://dx.doi.org/10.1016/s1472-6483(12)60013-3.

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Rozprawy doktorskie na temat "Human cell types"

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Yeudall, W. Andrew. "Human papillomavirus types in oral squamous cell carcinogenesis". Thesis, University of Glasgow, 1991. http://theses.gla.ac.uk/40921/.

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The DNAs of human papillomavirus (HPV) types 4, 16 and 18 have been detected in biopsies of normal and malignant human oral mucosa by Southern blot hybridisation and polymerase chain reaction (PCR). By the former technique HPV-4, HPV-16 and HPV-18 DNAs were detected in three separate carcinomas, but only found in adjacent dysplastic and normal tissue by PCR. The PCR technique also allowed detection of HPV-16 and HPV-18 DNA in additional carcinomas and normal samples. The oral HPV-4 DNA has been molecularly cloned and extensive restriction analysis and nucleotide sequencing showed identity with the prototype HPV-4 DNA. The HPV-18 DNA detected by Southern blot hybridisation showed an altered restriction pattern in the El region of the viral genome; however direct nucleotide sequencing of PCR products from the E6 ORF showed no sequence alterations in either normal or malignant samples. HPV-16 DNA detected in one carcinoma by Southern blot hybridisation revealed altered PstI and Hpall restriction patterns as compared with the prototype viral genome. The expected 2.6kb Hpall and 1.55kb PstI bands, which overlap, were absent, and an additional band of reduced molecular weight was visible in the Hpall digest, suggesting that the oral HPV-16 genome had undergone a deletion or rearrangement. In a further two carcinoma samples positive for HPV-16 DNA by PCR, amplification of a late region fragment of the viral genome produced fragments of reduced molecular weight. When these PCR fragments were used as probes, hybridisation was observed to the 1.78kb PstI and 1.81kb Hpall-BamHI bands of HPV-16 DNA, and also (as a smear) to human genomic DNA from both tumour and normal samples. This suggests that the viral DNA in these samples had undergone recombination events with repetitive cellular sequences, perhaps as a prelude to viral integration or as a means of activating cellular genes. A keratinocyte culture (T45) derived from an oral squamous cell carcinoma was found to be non-tumorigenic in vivo. PCR analysis revealed that a proportion of cells in the culture contained HPV-16 early sequences. The establishment of HPV-positive and HPV-negative clones from this culture will provide an excellent system for studying the role of viral and cellular factors in oral squamous cell carcinogenesis.
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Björklund, Frida. "Subcellular mapping of cell types in healthy human pancreatic islets". Thesis, KTH, Proteinvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302215.

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Pancreatic islets are composed of endocrine cells that secrete hormones essential for blood-glucose homeostasis. Prior research has revealed that the gene expression and functionality of human islet cells is heterogenous. However, it is not currently understood how the heterogeneity correlates to normal islet cell function and dysfunction in diabetes pathogenesis. Subsequently, an international collaborative project has been initiated to elucidate what constitutes islet cell heterogeneity from a transcriptional, proteomic, and functional perspective in both health and disease. In this study, a highly multiplex tissue image assay was developed to allow for the study of the localization and distribution of proteins previously identified to correlate with functional activity and heterogeneity in islet cells using the CO-Detection by indEXing (CODEX) platform. In total, 22 proteins were studied simultaneously of which 10 were specifically expressed in islet cells. These included generic pancreatic markers such as C-peptide (C-pep) marking insulin-secreting β-cells, glucagon (GCG) and somatostatin (SST), but also less well-characterized proteins such as Shisa like 2B (FAM159B) and Neural proliferation, differentiation and control 1 (NPDC1). The multiplex tissue imaging allowed for single-cell analysis of protein expression in human islet cells showing that most islet specific proteins were heterogeneously expressed. The observations made in this study serves as a validation to that the human islet microenvironment is highly complex due to islet cell heterogeneity. Additionally, the study demonstrated that multiplex tissue imaging has the potential to reveal novel cell types and interactions.
Langerhanska öar består av endokrina celler som utsöndrar hormoner nödvändiga för reglering av blodsockernivåerna. Tidigare forskning har visat att genuttrycket och funktionaliteten är heterogen i de celler som utgör mänskliga Langerhanska öar. Dock är förståelsen för hur heterogeniteten korrelerar till normal cellfunktion och dysfunktion i diabetespatogenes fortfarande ofullständig. Följaktligen har ett internationellt samarbete inletts i syfte att  undersöka  vad som utgör heterogenitet  i  Langerhanska öar ur ett transkriptionellt, proteomiskt och funktionellt perspektiv i såväl friska som sjuka individer. I denna studie utvecklades en metod för multiplex mikroskopisk avbildning av vävnad för att möjliggöra undersökningen av hur proteiner som tidigare korrelerats med endokrin cellspecifik aktivitet och heterogenitet i Langerhanska öar var lokaliserade med hjälp av plattformen för Co-Detection by indEXing (CODEX). Totalt undersöktes 22 proteiner samtidigt varav 10 var specifikt uttryckta i celler som utgör Langerhanska öar. Bland dessa proteiner fanns generella markörer för vanligt förekommande celltyper i Langerhanska öar såsom C-peptid (C-pep) som markör för insulinsekreterande β-celler, glukagon (GCG) och somatostatin (SST) såväl som proteiner med färre kända funktioner såsom Shisa like B (FAM159B) och Neural proliferation, differentiation and control 1 (NPDC1). Med hjälp av multiplex mikroskopisk avbildning av vävnad kunde uttrycket av proteiner specifikt uttryckta i celler som utgör Langerhanska öar analyseras för enskilda celler i vävnaden. Denna analys visade att de flesta proteiner specifikt uttryckta i celler som Langerhanska öar består av var heterogent uttrycka. Resultaten från denna studie validerar att mikromiljön i Langerhanska öar är mycket komplex på grund av cellernas heterogenitet. Vidare visade denna studie att multiplex mikroskopisk avbildning av vävnad har potentialen att identifiera nya celltyper och interaktioner.
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Butterworth, B. H. "Immunocytochemical characterization of the cell populations of the human placenta". Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372864.

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Reid, Fiona Jane. "Plasminogen activators and their inhibitor synthesized by human mesangial cells and other cell types". Thesis, University of Aberdeen, 1994. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU539471.

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The plasminogen activator synthesized by human mesangial cells was identified as tissue-type plasminogen activator (t-PA). Glomerular epithelial cells synthesized t-PA and urokinase (u-PA). Both mesangial cells and glomerular epithelial cells synthesized plasminogen activator inhibitor-1 (PAI-1) into culture supernatant. In this study experimental techniques were developed to allow quantification of matrix-associated PAI-1. PAI-1 associated with the matrix of mesangial cells was less than 1% of the total PAI-1 synthesized by the cells. Similar amounts were detected in the matrix of human umbilical vein endothelial cells and Hep G2 cells. When cultured in the presence of transforming growth factor- (TGF-), PAI-1 synthesized by mesangial cells was significantly increased and this up-regulation was shown to occur at the mRNA level. PAI-1 associated with the matrix of mesangial cells also significantly increased, though matrix-associated PAI-1 still constituted less than 1% of the total PAI-1 synthesized by the cells. TGF- stimulated the synthesis of PAI-1 by whole glomeruli, epithelial cells and epithelial-mesangial cell co-cultures, while decreasing their overall plasminogen activator synthesis. When cultured in the presence of platelet-derived growth factor-BB (PDGF-BB) there was no effect on either PA or PAI-1 synthesized by the glomerular cells examined. TGF- has been implicated in the development of glomerulonephritis via an effect on matrix production. Our results suggest tht TGF- also plays a role in the proteolytic balance within the glomerulus, leading to an environment favouring its deposition.
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Schnyder-Candrian, Silvia. "Gene expression of neutrophil-activating peptides in various human cell types /". [S.l.] : [s.n.], 1994. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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Gibson, Douglas Alistair. "Role for oestrogen in dynamic interactions between cell types within the human endometrium". Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/9890.

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The human endometrium is a complex multicellular tissue, located within the cavity of the uterus. Its luminal surface is defined by a layer of epithelial cells supported on a multicellular stroma containing fibroblasts, glands (lined by a secretory epithelium), blood vessels (lined with endothelial cells) and several populations of immune cells; the latter includes a unique population of natural killer (uNK) cells. The endometrium undergoes dynamic remodelling across the menstrual cycle in response to fluctuating levels of sex steroids secreted by ovarian cells. The phases of the endometrial cycle include an oestrogendominated proliferative phase, a progesterone-dominated secretory phase and menses (endometrial shedding precipitated by falling levels of progesterone). A key feature of the secretory phase is differentiation (decidualisation) of endometrial stromal fibroblasts (ESC) an event characterised by transformation of cell shape, secretion of growth factors/cytokines, angiogenesis/vascular remodelling and an increase in the numbers of resident immune cells. Decidualisation ensures an appropriate nutritional and hormonal environment exists during the establishment of pregnancy. Studies in mice suggest that de novo biosynthesis of oestrogen within the uterus may play an essential role in regulation of decidualisation but no data exist for human. Endometrial endothelial and uNK cells both contain oestrogen receptors but the impact of oestrogens on their function has not been explored. In the current studies three questions have been addressed: 1. Is oestrogen biosynthesis a feature of human endometrial stromal cell decidualisation? 2. What is the impact of oestrogen on uNK cell function? 3. What role (if any) does oestrogen play in the interplay between decidual, immune and vascular cells within the human endometrial stroma? Results obtained provide the first evidence that de novo biosynthesis of oestrogens occurs during decidualisation of human ESC. This was attributed to changes in expression patterns of mRNAs encoding proteins that play a critical role in regulation of oestrogen biosynthesis (STAR, CYP11A1, CYP19A1 [aromatase], HSD17B2 [17βHSD2] and STS [steroid sulphatase]). Changes in the pattern of metabolism were confirmed using thin layer chromatography and analysis of concentrations of oestrone (E1) and oestradiol (E2) in culture media. Secretion of E1 and E2 was reduced by addition of an aromatase inhibitor. Data derived from studies described within this thesis also show for the first time that incubation of uNK cells with E2 not only enhanced cell migration but also stimulated secretion of factors that had a significant impact on endothelial cell angiogenesis. These findings were supported by novel evidence that E2 had a significant impact on expression of genes associated with cell motility and angiogenesis. In addition, factors, including E1/E2, secreted by decidualised stromal cells, stimulated chemotaxis of uNK cells. Future experiments will focus on determining the identity of the angiogenic factors secreted by uNK cells in response to E2 and the mechanisms responsible for uNK cell movement. In summary, new data presented in this thesis provide evidence that local biosynthesis of oestrogens within the endometrial stroma may play a previously unrecognised role in regulating the function of uNK cells and endometrial endothelial cells in women. These results have implications for treatment of disorders such as infertility, heavy menstrual bleeding and endometriosis.
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WATANABE, KAZUYOSHI, MITSUO MAEHARA i MASAO KITO. "THREE TYPES OF VOLTAGE-DEPENDENT CALCIUM CURRENTS IN CULTURED HUMAN NEUROBLASTOMA CELLS". Nagoya University School of Medicine, 1995. http://hdl.handle.net/2237/16080.

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Ito, Akiko. "Histamine modulates three types of K^+ current in a human intestinal epithelial cell line". Kyoto University, 1997. http://hdl.handle.net/2433/202235.

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Dimas, Antigone. "The role of regulatory variation in sculpting gene expression across human populations and cell types". Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608695.

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Johnson, Travis Steele. "Estimation of Neural Cell types in the Allen Human Brain Atlas using Murine-derived Expression Profiles". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461243036.

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Książki na temat "Human cell types"

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El-Salam, Mahmoud Abd. The prevalence of different human papillomavirus types and p53 mutations in laryngeal squamous cell carcinomas. [s.l.]: typescript, 1994.

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Per, Höllsberg, i Hafler David A, red. Human T-cell lymphotropic virus type I. Chichester: J. Wiley and Sons, 1996.

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Connor, Sabrina. Extraction of Human papillomavirus type 16 DNA from the SiHa cervical cancer cell line. Sudbury, Ont: Laurentian University, 1991.

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Mckhann, Guy Mead. Isolation and characterization of human T-cell lymphotropic virus type-1 from patients with tropical spastic paraparesis. [New Haven: s.n.], 1990.

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Verfasser, Schließmann Stephan J., Kirschbaum Andreas Verfasser, Plönes Till 1976 Verfasser, Müller-Quernheim Joachim 1953 Verfasser, Zissel Gernot Verfasser, Klinik für Pneumologie, Albert-Ludwigs-Universität Freiburg Medizinische Fakultät i Albert-Ludwigs-Universität Freiburg, red. Roflumilast-N-oxide induces surfactant protein expression in human alveolar epithelial cells type II. Freiburg: Universität, 2012.

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Swingler, Simon. Cytokine regulation of human immunodeficiency virus type 1 gene expression in cells of neural origin. [s.l.]: typescript, 1992.

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Bourgeault, Geoffrey A. Energy metabolism of wild type MCF-7 human breast cancer cells and its adriamyacin resistant derivative. Sudbury, Ont: Laurentian University, 1997.

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Gutowski, Nicholas Jan. Cellular and molecular studies related to a cell line of the oligodendrocyte-type-2 astrocyte lineage derived from a human glioblastoma multiforme. Birmingham: University of Birmingham, 1995.

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The immortal life of Henriette Lacks. Waterville, Me: Thorndike Press, 2010.

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The immortal life of Henrietta Lacks. New York: Crown Publishers, 2009.

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Części książek na temat "Human cell types"

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Healy, Lyn, i Ludmila Ruban. "Miscellaneous Cell Types and Cell Lines of Interest". W Atlas of Human Pluripotent Stem Cells in Culture, 187–98. Boston, MA: Springer US, 2014. http://dx.doi.org/10.1007/978-1-4899-7507-2_12.

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Beale, Andrew D., Fatima H. Labeed, Stephen J. Kitcatt i John S. O’Neill. "Detecting Circadian Rhythms in Human Red Blood Cells by Dielectrophoresis". W Methods in Molecular Biology, 255–64. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2249-0_17.

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AbstractDielectrophoresis (DEP) enables the measurement of population-level electrophysiology in many cell types by examining their interaction with an externally applied electric field. Here we describe the application of DEP to the measurement of circadian rhythms in a non-nucleated cell type, the human red blood cell. Using DEP, population-level electrophysiology of ~20,000 red blood cells can be measured from start to finish in less than 3 min, and can be repeated over several days to reveal cell-autonomous daily regulation of membrane electrophysiology. This method is amenable to the characterization of circadian rhythms by altering entrainment and free-run conditions or through pharmacological perturbation.
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Murphy, Edward L., i Roberta L. Bruhn. "Human T-Cell Leukemia Viruses Types 1 and 2". W Viral Infections of Humans, 1105–34. Boston, MA: Springer US, 2014. http://dx.doi.org/10.1007/978-1-4899-7448-8_45.

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Murphy, Edward L., i Roberta L. Bruhn. "Human T-Cell Leukemia Viruses Types 1 and 2". W Viral Infections of Humans, 1–58. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-4939-9544-8_45-1.

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Caruso, Breanna, Raya Massoud i Steven Jacobson. "Human T-Cell Lymphotropic Virus Types 1 and 2". W Manual of Molecular and Clinical Laboratory Immunology, 674–81. Washington, DC, USA: ASM Press, 2016. http://dx.doi.org/10.1128/9781555818722.ch70.

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Hariharan, Krithika, Petra Reinke i Andreas Kurtz. "Generating Multiple Kidney Progenitors and Cell Types from Human Pluripotent Stem Cells". W Methods in Molecular Biology, 103–15. New York, NY: Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9021-4_9.

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Tomita, Yusuke, Hideaki Yamana i Teruo Kakegawa. "Two Types of Monoclonal Antibodies Against Human Esophageal Squamous Cell Carcinoma". W Recent Advances in Diseases of the Esophagus, 421–26. Tokyo: Springer Japan, 1993. http://dx.doi.org/10.1007/978-4-431-68246-2_67.

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Tokcaer-Keskin, Zeynep, i Dimitris G. Placantonakis. "Genetic Identification of Human Embryonic Stem Cell-Derived Neural Cell Types Using Bacterial Artificial Chromosomes". W Stem Cells and Cancer Stem Cells, Volume 10, 125–36. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6262-6_11.

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McClain, K., H. Chen, A. Filipovich, A. Feller i G. Bornkam. "Characterization of Cell Types and EBV Gene Expression in Lymphoproliferative Diseases (LPD) of Patients Receiving Bone Marrow Transplants (BMT) after T-Cell Depletion". W Epstein-Barr Virus and Human Disease • 1988, 293–96. Totowa, NJ: Humana Press, 1989. http://dx.doi.org/10.1007/978-1-4612-4508-7_44.

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Fenyö, E. M., i B. Åsjö. "Growth of the HTLV-III Strain of Human Immunodeficiency Virus in Different Cell Types". W Haematology and Blood Transfusion / Hämatologie und Bluttransfusion, 436–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72624-8_93.

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Streszczenia konferencji na temat "Human cell types"

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Hunter, N. R., I. R. MacGregor, J. Dawes i D. S. Pepper. "MICROCARRIER CULTURE OF HUMAN ENDOTHELIAL CELL TYPES - A SOURCE OF METABOLITES". W XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643348.

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The production of human endothelial cell secretory products in amounts sufficient for biochemical studies is largely restricted by the culture growth area. Conventional flat bed systems yield at best 20-30 x 106 cells per 180cm2 culture flask. To overcome this problem, cells may be grown on Cytodex 3 microcarriers allowing large numbers of cells to be grown and conditioned in small culture volumes. A typical microcarrier unit will contain 200-300 x 106 cells and may be expanded in excess of 1000 x 106 cells at confluence. High viability (95%) and recovery (70-80%) in sub-culturing of microcarrier to microcarrier culture can be achieved with careful management of culture conditions and brief exposure to enzymes.Human umbilical artery and vein, and saphenous vein endothelial cells were prepared and grogn on microcarrier cultures to cell populations of 200-450 x 106 cells and conditioned for 14 day periods in serum-free media.The production profiles of several endothelial cell proteins including thrombospondin (TSP), von Willebrand Factor (vWF) and issue plasminogen activator (t-PA) were measured by radioimmunoassay under these conditions, and demonstrate the use of microcarrier cultures in producing milligram quantities of engothelial cell protein. For example, a HUVEC culture of 200 x 106 cells conditioned with serum-free media for 14 days yielded a total of 6.9mg TSP, 0.7mg vWF and 48.9ug t-PA. In this laboratory one such application of the system was the purification of endothelial proteins in amounts sufficient for immunisation of mice prior to the production of monoclonal antibodies and for subsequent characterisation.
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Yasukawa, Tomoyuki, Masato Suzuki, Hitoshi Shiku i Tomokazu Matsue. "Micropatterning with different cell types by dielectrophoretic manipulation". W 2007 International Symposium on Micro-NanoMechatronics and Human Science. IEEE, 2007. http://dx.doi.org/10.1109/mhs.2007.4420848.

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Filippi, J. F., D. Arnoux, N. Tubiana, B. Boutière, F. Le Caär, J. Sampol, Lab Hématol, Pr J. Sampol i Pr Y. Carcassonne. "PLASMINOGEN ACTIVATOR ACTIVITY OF NORMAL AND MALIGNANT MONONUCLEAR HUMAN CELLS". W XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643167.

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Plasminogen activators (PA) are thought to play a role in the invasive and metastatic properties of many types of cancer cells. Though, discrepancies in correlations between fibrinolytic activity and metastatic potential of malignant cells have been described.In this study, we evaluated both tissue type (tPA) and urokinase type (UK) cellular PA activities in different mononuclear cell types : normal T and B human peripheral lymphocytes, B cells from patients with chronic lymphocytic leukemia (CLL), human blood monocytes, alveolar macrophages, U 937, RAJI and JM cell 1ines.Mononuclear cells were isolated by Ficoll-hypaque gradients and monocytes by plastic adhesion. T and B cells were separated by a rosetting technique using sheep red blood cells. Cellular extracts were prepared by 0.5 % Triton X 100 buffer treatment followed by sonication and centrifugation 10 ' at 2000 g. PA assays were performed on the supernatants.UK-type PA was evaluated by a liquid-phase assay in presence of human plasminogen (Kabi) and chromogenic substrate S 2251 (Kabi).tPA was determinated using a solid-phase fibrin activity assay which involves an affinity separation step and thus allows selective detection of tPA.In both cases, results were reported in international units by reference to standard curves of UK (Choay) or tPA (Kabi).In all cell types tested, PA detected was essentially urokinase-type. Highest PA activity was found in U 937 cells (0.7 IU/5×l06 cells). In normal blood lymphocytes, mean PA activity was 0.08 IU/5×l06 cells. Examination of lymphocytes from patients with CLL revealed a marked decrease in UK activity as compared to normals (< 0.01 IU/5×106 cells in more than 50 % cases).The function of PA in normal lymphocyte physiology and the potential pathogenic role of diminished PA in CLL lymphocytes remains to be investigated.
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Adany, R., A. Kiss, J. Kappelmayer, R. J. Ablin i L. Muszbek. "EXPRESSION OF FACTOR XIII SUBUNIT A IN DIFFERENT TYPES OF HUMAN MACROPHAGES". W XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644651.

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In addition to plasma the presence of subunit a of blood coagulation Factor XIII (FXIIl) has been verified in platelets and megakariocytes. Most recently, we demonstrated that human peripheral blood monocytes also contain FXIII subunit a. The present study was designed 1/ to determine the stage in the maturation sequence of bone marrow monocytopoesis in which FXIII appears 2/ to establish if FXIII is retained during differentiation into macrophages 3/ to assess how general is the presence of FXIII subunit a in different types of macrophages. FXIII subunit a was immunomorphologically detected in bone marrow smears, in cytospin preparations of cells from serous cavities (pleural, peritoneal, pericardial and synovial spaces), and paraformaldehyde-fixed paraffin-embedded or frozen sections of different organs where classical types of macrophages have been described earlier (liver, lung, thymus, skin, connective tissue, prostate and developing bone) . Cells containing FXIII subunit a were intensively characterized by immunofluorescent and enzymecytochemical techniques in double and treble labeling systems. Its presence was clearly demonstrated in promonocytes of bone marrow, and in all probability, it is present in monoblasts, as well. FXIII was also found in macrophages from different serous cavities and in embryonic osteoclasts. Cells containing FXIII subunit a of connective tissue were found to be tissue histiocytes, and not fibroblasts as previously thought. Kupffer cells of the liver and Langerhans cells of the epidermis were negative supporting theories that these cells are not members of monocyte-derived macrophage cell population. Immunomorphological detection of FXIII subunit a seems to be a useful marker for labeling the continuum of monocyte/macrophage cell line from the earliest ftrais in the bone marrow to the mature forms of macrophages and might be a valuable tool in the cytological diagnosis of malignant disorders of this cell line.
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Hashimoto, Shigehiro, Kiyoshi Yoshinaka i Hiroki Yonezawa. "Behavior of Cell Under Wall Shear Stress in Flow Field: Comparison Among Cell Types". W ASME 2021 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/fedsm2021-65205.

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Abstract Does the hysteresis effect remain in each cell after division? In the present study, the cell activity has been investigated after division under a shear stress field. To apply the constant shear stress field on cells, a Couette type flow device has been manufactured: between parallel walls (a lower stationary culture disk, and an upper rotating disk) with a constant gap. The wall shear stress was controlled by the rotating speed of the upper disk. Four types of cells were used in the test: C2C12 (mouse myoblast cell line), HUVEC (Human Umbilical Vein Endothelial Cells), 3T3-L1 (mouse fat precursor cells), and L929 (mouse fibroblast connective tissue). After cultivation without flow for 24 hours for adhesion of cells on the lower plate, the shear stress of 1 Pa was continuously applied on cells for 7 days at 310 K. The behavior (alignment and deformation) of each cell was traced at the time lapse image observed by an inverted phase contrast microscope placed in an incubator. The experimental results show the following behavior of each type of cell: C2C12 tends to return to the same direction as that of before division. Deformed 3T3-L1 tends to tilt to the flow direction.
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Semelsberger, Scott Daniel, Olga Sizova, Dan Li, Qing Ma, Lisa St. John, Gheath Al-Atrash i Jeffrey Molldrem. "Evaluation of newly generated LRP1 antibodies in different cell types: THP1 cancer cell line, human and mouse immune cells". W The MD Anderson Summer Experience 2022. The University of MD Anderson Cancer Center, 2022. http://dx.doi.org/10.52519/00015.

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Walsh, Michael J., Michael J. Nasse, F. Nell Pounder, Virgilia Macias, Andre Kajdacsy-Balla, Carol Hirschmugl, Rohit Bhargava, Adriana Predoi-Cross i Brant E. Billinghurst. "Synchrotron FTIR Imaging For The Identification Of Cell Types Within Human Tissues". W WIRMS 2009 5TH INTERNATIONAL WORKSHOP ON INFRARED MICROSCOPY AND SPECTROSCOPY WITH ACCELERATOR BASED SOURCES. AIP, 2010. http://dx.doi.org/10.1063/1.3326333.

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Hashimoto, Shigehiro, Hiroki Yonezawa i Ryuya Ono. "Cell Activity Change After Division Under Wall Shear Stress Field". W ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-69689.

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Abstract Does cell orientation depend on the cell type in the shear stress field? Does that tendency change after the division? In this study, the behavior of each cell after division was tracked by time-lapse microscopic images through 24 hours of culture under a shear stress field. A constant shear stress field was applied to the cells in the Couette flow between the parallel walls: the lower static culture disc and the upper rotating disc. For comparison, four types of cells were used: C2C12 (mouse myoblast), HUVEC (human umbilical vein endothelial cells), 3T3-L1 (mouse adipose progenitor cells), and L929 (mouse fibroblast). The result is as follows. In the wall shear stress field of 1 Pa, HUVEC is oriented parallel to the flow, regardless of the division. In other cell types (C2C12, 3T3-L1, and L929) after division, the deformed cell tends to tilt to the direction parallel to the flow. The experimental results are expected to be applied to engineered tissue technologies.
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Iwase, Masaki, Masumi Yamada i Minoru Seki. "Fabrication of vascular tissue models by assembling multiple cell types inside hydrogel microchannels". W 2012 International Symposium on Micro-NanoMechatronics and Human Science (MHS). IEEE, 2012. http://dx.doi.org/10.1109/mhs.2012.6492478.

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JOHNSON, TRAVIS, ZACHARY ABRAMS, YAN ZHANG i KUN HUANG. "MAPPING NEURONAL CELL TYPES USING INTEGRATIVE MULTI-SPECIES MODELING OF HUMAN AND MOUSE SINGLE CELL RNA SEQUENCING". W Proceedings of the Pacific Symposium. WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813207813_0055.

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Raporty organizacyjne na temat "Human cell types"

1

Williams, Thomas. Cell Biology Board Game: Cell Survival (School Version). University of Dundee, 2022. http://dx.doi.org/10.20933/100001270.

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Cells are the smallest units of life. The environment around cells is always changing. Cells need to adapt to survive. This curriculum linked game and lesson plan introduces the world of cells to pupils 8-13. But can they keep their cells alive? This is a guide to how the cell survival resources can be used in a lesson and can be adapted as the teacher sees fit to do so. This lesson is aimed at 8-13 year olds, and fits into an hour long session. The Cell Survival Game has been adapted for both home use and for use in the classroom, and is accompanied by a series of videos. Learning Outcomes – Cells are the smallest unit of life – There are many different types of cells, and some examples of cell types – Cells experience many dangers, and some examples of dangers – How cells notice and defend themselves against dangers Links to the Curriculum – Health and Wellbeing: I am developing my understanding of the human body – Languages: I can find specific information in a straight forward text (book and instructions) to learn new things, I discover new words and phrases (relating to cells) – Mathematics: I am developing a sense of size and amount (by using the dice), I am exploring number processes (addition and subtraction) and understand they represent quantities (steps to finish line), I am learning about measurements (cell sizes) and am exploring patterns (of cell defences against dangers) – Science: I am learning about biodiversity (different types of microbes), body systems, cells and how they work. – Technology: I am learning about new technologies (used to understand how cells work).
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Belkin, Shimshon, Sylvia Daunert i Mona Wells. Whole-Cell Biosensor Panel for Agricultural Endocrine Disruptors. United States Department of Agriculture, grudzień 2010. http://dx.doi.org/10.32747/2010.7696542.bard.

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Objectives: The overall objective as defined in the approved proposal was the development of a whole-cell sensor panel for the detection of endocrine disruption activities of agriculturally relevant chemicals. To achieve this goal several specific objectives were outlined: (a) The development of new genetically engineered wholecell sensor strains; (b) the combination of multiple strains into a single sensor panel to effect multiple response modes; (c) development of a computerized algorithm to analyze the panel responses; (d) laboratory testing and calibration; (e) field testing. In the course of the project, mostly due to the change in the US partner, three modifications were introduced to the original objectives: (a) the scope of the project was expanded to include pharmaceuticals (with a focus on antibiotics) in addition to endocrine disrupting chemicals, (b) the computerized algorithm was not fully developed and (c) the field test was not carried out. Background: Chemical agents, such as pesticides applied at inappropriate levels, may compromise water quality or contaminate soils and hence threaten human populations. In recent years, two classes of compounds have been increasingly implicated as emerging risks in agriculturally-related pollution: endocrine disrupting compounds (EDCs) and pharmaceuticals. The latter group may reach the environment by the use of wastewater effluents, whereas many pesticides have been implicated as EDCs. Both groups pose a threat in proportion to their bioavailability, since that which is biounavailable or can be rendered so is a priori not a threat; bioavailability, in turn, is mediated by complex matrices such as soils. Genetically engineered biosensor bacteria hold great promise for sensing bioavailability because the sensor is a live soil- and water-compatible organism with biological response dynamics, and because its response can be genetically “tailored” to report on general toxicity, on bioavailability, and on the presence of specific classes of toxicants. In the present project we have developed a bacterial-based sensor panel incorporating multiple strains of genetically engineered biosensors for the purpose of detecting different types of biological effects. The overall objective as defined in the approved proposal was the development of a whole-cell sensor panel for the detection of endocrine disruption activities of agriculturally relevant chemicals. To achieve this goal several specific objectives were outlined: (a) The development of new genetically engineered wholecell sensor strains; (b) the combination of multiple strains into a single sensor panel to effect multiple response modes; (c) development of a computerized algorithm to analyze the panel responses; (d) laboratory testing and calibration; (e) field testing. In the course of the project, mostly due to the change in the US partner, three modifications were introduced to the original objectives: (a) the scope of the project was expanded to include pharmaceuticals (with a focus on antibiotics) in addition to endocrine disrupting chemicals, (b) the computerized algorithm was not fully developed and (c) the field test was not carried out. Major achievements: (a) construction of innovative bacterial sensor strains for accurate and sensitive detection of agriculturally-relevant pollutants, with a focus on endocrine disrupting compounds (UK and HUJ) and antibiotics (HUJ); (b) optimization of methods for long-term preservation of the reporter bacteria, either by direct deposition on solid surfaces (HUJ) or by the construction of spore-forming Bacillus-based sensors (UK); (c) partial development of a computerized algorithm for the analysis of sensor panel responses. Implications: The sensor panel developed in the course of the project was shown to be applicable for the detection of a broad range of antibiotics and EDCs. Following a suitable development phase, the panel will be ready for testing in an agricultural environment, as an innovative tool for assessing the environmental impacts of EDCs and pharmaceuticals. Furthermore, while the current study relates directly to issues of water quality and soil health, its implications are much broader, with potential uses is risk-based assessment related to the clinical, pharmaceutical, and chemical industries as well as to homeland security.
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Coplin, David, Isaac Barash i Shulamit Manulis. Role of Proteins Secreted by the Hrp-Pathways of Erwinia stewartii and E. herbicola pv. gypsophilae in Eliciting Water-Soaking Symptoms and Initiating Galls. United States Department of Agriculture, czerwiec 2001. http://dx.doi.org/10.32747/2001.7580675.bard.

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Many bacterial pathogens of plants can inject pathogenicity proteins into host cells using a specialized type III secretion system encoded by hrpgenes. This system deliver effector proteins, into plant cells that function in both susceptible and resistant interactions. We have found that the virulence of Erwinia stewartii(Es; syn. Pantoea stewartii) and Erwinia herbicola pv. gypsophilae (Ehg, syn. Pantoea agglomerans), which cause Stewart's wilt of corn and galls on Gypsophila, respectively, depends on hrpgenes. The major objectives of this project were: To increase expression of hrpgenes in order to identify secreted proteins; to identify genes for proteins secreted by the type-III systems and determine if they are required for pathogenicity; and to determine if the secreted proteins can function within eukaryotic cells. We found that transcription of the hrp and effector genes in Es and Ehg is controlled by at least four genes that constitute a regulatory cascade. Environmental and/or physiological signaling appears to be mediated by the HrpX/HrpY two component system, with HrpX functioning as a sensor-kinase and HrpY as a response regulator. HrpYupregulateshrpS, which encodes a transcriptional enhancer. HrpS then activates hrpL, which encodes an alternate sigma factor that recognizes "hrp boxes". All of the regulatory genes are essential for pathogenicity, except HrpX, which appears only to be required for induction of the HR in tobacco by Es. In elucidating this regulatory pathway in both species, we made a number of significant new discoveries. HrpX is unusual for a sensor-kinase because it is cytoplasmic and contains PAS domains, which may sense the redox state of the bacterium. In Es, a novel methyl-accepting protein may function upstream of hrpY and repress hrp gene expression in planta. The esaIR quorum sensing system in Es represses hrp gene expression in Es in response to cell-density. We have discovered six new type III effector proteins in these species, one of which (DspE in Ehg and WtsE in Es) is common to both pathogens. In addition, Es wtsG, which is a homolog of an avrPpiB from P. syringae pv. pisi, and an Ehg ORF, which is a homolog of P. syringae pv. phaseolicola AvrPphD, were both demonstrated to encode virulence proteins. Two plasmidborne, Ehg Hop proteins, HsvG and PthG, are required for infection of gypsophilia, but interestingly, PthG also acts as an Avr elicitor in beets. Using a calmodulin-dependent adenylate cyclase (cyaA) reporter gene, we were successful in demonstrating that an HsvG-CyaA fusion protein can be transferred into human HeLa cells by the type-III system of enteropathogenic E. coli. This is a highly significant accomplishment because it is the first direct demonstration that an effector protein from a plant pathogenic bacterium is capable of being translocated into a eukaryotic cell by a type-III secretion system. Ehg is considered a limiting factor in Gypsophila production in Israel and Stewart’s Wilt is a serious disease in the Eastern and North Central USA, especially on sweet corn in epidemic years. We believe that our basic research on the characterization of type III virulence effectors should enable future identification of their receptors in plant cells. This may lead to novel approaches for genetically engineering resistant plants by modifying their receptors or inactivating effectors and thus blocking the induction of the susceptible response. Alternatively, hrp gene regulation might also provide a target for plant produced compounds that interfere with recognition of the host by the pathogen. Such strategies would be broadly applicable to a wide range of serious bacterial diseases on many crops throughout the USA and Israel.
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4

Hawkins, Brian T., i Sonia Grego. A Better, Faster Road From Biological Data to Human Health: A Systems Biology Approach for Engineered Cell Cultures. RTI Press, czerwiec 2017. http://dx.doi.org/10.3768/rtipress.2017.rb.0015.1706.

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Traditionally, the interactions of drugs and toxicants with human tissue have been investigated in a reductionist way—for example, by focusing on specific molecular targets and using single-cell-type cultures before testing compounds in whole organisms. More recently, “systems biology” approaches attempt to enhance the predictive value of in vitro biological data by adopting a comprehensive description of biological systems and using computational tools that are sophisticated enough to handle the complexity of these systems. However, the utility of computational models resulting from these efforts completely relies on the quality of the data used to construct them. Here, we propose that recent advances in the development of bioengineered, three-dimensional, multicellular constructs provide in vitro data of sufficient complexity and physiological relevance to be used in predictive systems biology models of human responses. Such predictive models are essential to maximally leveraging these emerging bioengineering technologies to improve both therapeutic development and toxicity risk assessment. This brief outlines the opportunities presented by emerging technologies and approaches for the acceleration of drug development and toxicity testing, as well as the challenges lying ahead for the field.
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Eshed, Yuval, i John Bowman. Harnessing Fine Scale Tuning of Endogenous Plant Regulatory Processes for Manipulation of Organ Growth. United States Department of Agriculture, 2005. http://dx.doi.org/10.32747/2005.7696519.bard.

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Background and objectives: Manipulation of plant organ growth is one of the primary reasons for the success of mankind allowing increasing amounts of food for human and livestock consumption. In contrast with the successful selection for desirable growth characteristics using plant breeding, transgenic manipulations with single genes has met limited success. While breeding is based on accumulation of many small alterations of growth, usually arise from slight changes in expression patterns, transgenic manipulations are primarily based on drastic, non-specific up-regulation or knock down of genes that can exert different effects during different stages of development. To successfully harness transgenic manipulation to attain desirable plant growth traits we require the tools to subtly regulate the temporal and spatial activity of plant growth genes. Polar morphology along the adaxial/abaxial axis characterizes lateral organs of all plants. Juxtaposition of two cell types along this axis is a prerequisite of laminar growth induction. In the study summarized here, we addressed the following questions: Can we identify and harness components of the organ polarity establishment pathway for prolonged growth? Can we identify specific regulatory sequences allowing spatial and temporal manipulation in various stages of organ development? Can we identify genes associated with YABBY-induced growth alterations? Major conclusions and implications: We showed that regulated expression, both spatially and temporally of either organ polarity factors such as the YABBY genes, or the organ maturation program such as the CIN-TCPs can stimulate substantial growth of leaves and floral organs. Promoters for such fine manipulation could be identified by comparison of non-coding sequences of KAN1, where a highly conserved domain was found within the second intron, or by examination of multiple 5” regions of genes showing transient expression along leaf ontogeny. These promoters illustrate the context dependent action of any gene we examined thus far, and facilitate fine tuning of the complex growth process. Implications, both scientific and agricultural. The present study was carried out on the model organism Arabidopsis, and the broad application of its findings were tested in the tomato crop. We learned that all central regulators of organ polarity are functionally conserved, probably in all flowering plants. Thus, with minor modifications, the rules and mechanisms outlined in this work are likely to be general.
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Noga, Edward J., Angelo Colorni, Michael G. Levy i Ramy Avtalion. Importance of Endobiotics in Defense against Protozoan Ectoparasites of Fish. United States Department of Agriculture, wrzesień 2003. http://dx.doi.org/10.32747/2003.7586463.bard.

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Infectious disease is one of the most serious causes of economic loss in all sectors of aquaculture. There is a critical need to understand the molecular basis for protection against infectious disease so that safer, more reliable and more cost-effective strategies can be designed for their control. As part of this effort, the major goal of our BARD project was to determine the importance of endobiotics as a defense against protozoan ectoparasites in fish. Endobiotics, or antimicrobial polypeptides, are peptides and small proteins that are increasingly recognized as having a vital role in the innate defense of virtually all animals. One objective of our BARD project was to determine the antiparasitic potency of one specific group of endobiotics that were isolated from hybrid striped bass (Morone saxatilis x M chrysops). We found that these endobiotics, which we had previously named histone-like proteins (HLPs), exhibited potent activity against Amyloodinium and that the putative levels of HLPs in the skin were well within the levels that we found to be lethal to the parasite in vitro. We also found evidence for the presence of similar antibiotics in sea bream (Sparus aurata) and Mediterranean sea bass (Dicentrarchus labrax). We also examined the effect of chronic stress on the expression of HLP in fish and found that HLP levels were dramatically decreased after only one week of a crowding/high ammonia sublethal stress. We also began to explore the feasibility of upregulating endobiotics via immunostimulation. However, we did not pursue this objective as fully as we originally intended because we spent a much larger effort than originally anticipated on the last objective, the attempted isolation of novel endobiotics from hybrid striped bass. In this regard, we purified and identified four new peptide endobiotics. These endobiotics, which we have named piscidins (from "Pisces" meaning fish), have potent, broad-spectrum activity against a number of both fish and human pathogens. This includes not only parasites but also bacteria. We also demonstrated that these peptides are present in the mast cell. This was the first time that the mast cell, the most common tissue granulocyte in vertebrates, was shown to possess any type of endobiotic. This finding has important implications in explaining the possible function of mast cells in the immune response of vertebrates. In summary, the research we have accomplished in this BARD project has demonstrated that endobiotics in fish have potent activity against many serious pathogens in aquaculture and that there is considerable potential to use these compounds as stress indicators in aquaculture. There is also considerable potential to use some of these compounds in other areas of medicine, including treatment of serious infectious diseases of humans and animals.
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Splitter, Gary A., Menachem Banai i Jerome S. Harms. Brucella second messenger coordinates stages of infection. United States Department of Agriculture, styczeń 2011. http://dx.doi.org/10.32747/2011.7699864.bard.

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Aim 1: To determine levels of this second messenger in: a) B. melitensiscyclic-dimericguanosinemonophosphate-regulating mutants (BMEI1448, BMEI1453, and BMEI1520), and b) B. melitensis16M (wild type) and mutant infections of macrophages and immune competent mice. (US lab primary) Aim 2: To determine proteomic differences between Brucelladeletion mutants BMEI1453 (high cyclic-dimericguanosinemonophosphate, chronic persistent state) and BMEI1520 (low cyclicdimericguanosinemonophosphate, acute virulent state) compared to wild type B. melitensisto identify the role of this second messenger in establishing the two polar states of brucellosis. (US lab primary with synergistic assistance from the Israel lab Aim 3: Determine the level of Brucellacyclic-dimericguanosinemonophosphate and transcriptional expression from naturally infected placenta. (Israel lab primary with synergistic assistance from the US lab). B. Background Brucellaspecies are Gram-negative, facultative intracellular bacterial pathogens that cause brucellosis, the most prevalent zoonosis worldwide. Brucellosis is characterized by increased abortion, weak offspring, and decreased milk production in animals. Humans are infected with Brucellaby consuming contaminated milk products or via inhalation of aerosolized bacteria from occupational hazards. Chronic human infections can result in complications such as liver damage, orchitis, endocarditis, and arthritis. Brucellaspp. have the ability to infect both professional and non-professional phagocytes. Because of this, Brucellaencounter varied environments both throughout the body and within a cell and must adapt accordingly. To date, few virulence factors have been identified in B. melitensisand even less is known about how these virulence factors are regulated. Subsequently, little is known about how Brucellaadapt to its rapidly changing environments, and how it alternates between acute and chronic virulence. Our studies suggest that decreased concentrations of cyclic dimericguanosinemonophosphate (c-di-GMP) lead to an acute virulent state and increased concentrations of c-di-GMP lead to persistent, chronic state of B. melitensisin a mouse model of infection. We hypothesize that B. melitensisuses c-di-GMP to transition from the chronic state of an infected host to the acute, virulent stage of infection in the placenta where the bacteria prepare to infect a new host. Studies on environmental pathogens such as Vibrio choleraeand Pseudomonas aeruginosasupport a mechanism where changes in c-di-GMP levels cause the bacterium to alternate between virulent and chronic states. Little work exists on understanding the role of c-di-GMP in dangerous intracellular pathogens, like Brucellathat is a frequent pathogen in Israeli domestic animals and U.S. elk and bison. Brucellamust carefully regulate virulence factors during infection of a host to ensure proper expression at appropriate times in response to host cues. Recently, the novel secondary signaling molecule c-di-GMP has been identified as a major component of bacterial regulation and we have identified c-di-GMP as an important signaling factor in B. melitensishost adaptation. C. Major conclusions, solutions, achievements 1. The B. melitensis1453 deletion mutant has increased c-di-GMP, while the 1520 deletion mutant has decreased c-di-GMP. 2. Both mutants grow similarly in in vitro cultures; however, the 1453 mutant has a microcolony phenotype both in vitro and in vivo 3. The 1453 mutant has increased crystal violet staining suggesting biofilm formation. 4. Scanning electron microscopy revealed an abnormal coccus appearance with in increased cell area. 5. Proteomic analysis revealed the 1453 mutant possessed increased production of proteins involved in cell wall processes, cell division, and the Type IV secretion system, and a decrease in proteins involved in amino acid transport/metabolism, carbohydrate metabolism, fatty acid production, and iron acquisition suggesting less preparedness for intracellular survival. 6. RNAseq analysis of bone marrow derived macrophages infected with the mutants revealed the host immune response is greatly reduced with the 1453 mutant infection. These findings support that microlocalization of proteins involved in c-di-GMP homeostasis serve a second messenger to B. melitensisregulating functions of the bacteria during infection of the host.
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Gillor, Osnat, Stefan Wuertz, Karen Shapiro, Nirit Bernstein, Woutrina Miller, Patricia Conrad i Moshe Herzberg. Science-Based Monitoring for Produce Safety: Comparing Indicators and Pathogens in Water, Soil, and Crops. United States Department of Agriculture, maj 2013. http://dx.doi.org/10.32747/2013.7613884.bard.

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Using treated wastewater (TWW) for crop irrigation represents an important opportunity for ensuring adequate food production in light of growing freshwater scarcity worldwide. However, the environmentally sustainable approach of using TWW for irrigation can lead to contamination of produce with fecal pathogens that may remain in treated water. The overall goal of this research was to evaluate the correlation between the presence of fecal indicator bacteria (FIB) and that of a suite of human pathogens in TWW, the irrigated soil, and crops. Field experiments were conducted to compare secondary and tertiary TWW with dechlorinated tap water for irrigation of tomatoes, a typical commercial crop, in Israel, a semi-arid country. Human pathogens including bacteria (Salmonella), protozoa (Cryptosporidiumand Giardia), and viruses (Adenovirus [AV Types A, B, C & 40/41] and Enterovirus [EV71 subtypes]) were monitored in two field trials using a combination of microscopic, cultivation-based, and molecular (qPCR) techniques. Results from the field trials indicate that microbial contamination on the surface of tomatoes did not appear to be associated with the source of irrigated waters; FIB contamination was not statistically different on tomatoes irrigated with TWW as compared to tomatoes irrigated with potable water. In fact, Indicator bacteria testing did not predict the presence of pathogens in any of the matrices tested. High concentrations of FIB were detected in water and on tomato surfaces from all irrigation treatment schemes, while pathogen contamination on tomato surfaces (Cryptosporidiumand Salmonella) was only detected on crops irrigated with TWW. These results suggest that regular monitoring for pathogens should take place to accurately detect presence of harmful microorganisms that could threaten consumer safety. A notable result from our study is that the large numbers of FIB in the water did not appear to lead to FIB accumulation in the soil. With the exception of two samples, E. coli that was present at 10³ to 10⁴ cells/100 mL in the water, was not detected in the soil. Other bacterial targets associated with the enteric environment (e. g., Proteusspp.) as well as protozoal pathogens were detected in the TWW, but not in the soil. These findings suggest that significant microbial transfer to the soil from TWW did not occur in this study. The pattern of FIB contamination on the surfaces of tomatoes was the same for all treatment types, and showed a temporal effect with more contamination detected as the duration of the field trial increased. An important observation revealed that water quality dramatically deteriorated between the time of its release from the wastewater treatment plant and the time it was utilized for irrigation, highlighting the importance of performing water quality testing throughout the growing season at the cultivation site.
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Miller, Gad, i Jeffrey F. Harper. Pollen fertility and the role of ROS and Ca signaling in heat stress tolerance. United States Department of Agriculture, styczeń 2013. http://dx.doi.org/10.32747/2013.7598150.bard.

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The long-term goal of this research is to understand how pollen cope with stress, and identify genes that can be manipulated in crop plants to improve reproductive success during heat stress. The specific aims were to: 1) Compare heat stress dependent changes in gene expression between wild type pollen, and mutants in which pollen are heat sensitive (cngc16) or heat tolerant (apx2-1). 2) Compare cngc16 and apx2 mutants for differences in heat-stress triggered changes in ROS, cNMP, and Ca²⁺ transients. 3) Expand a mutant screen for pollen with increased or decreased thermo-tolerance. These aims were designed to provide novel and fundamental advances to our understanding of stress tolerance in pollen reproductive development, and enable research aimed at improving crop plants to be more productive under conditions of heat stress. Background: Each year crop yields are severely impacted by a variety of stress conditions, including heat, cold, drought, hypoxia, and salt. Reproductive development in flowering plants is highly sensitive to hot or cold temperatures, with even a single hot day or cold night sometimes being fatal to reproductive success. In many plants, pollen tube development and fertilization is often the weakest link. Current speculation about global climate change is that most agricultural regions will experience more extreme environmental fluctuations. With the human food supply largely dependent on seeds, it is critical that we consider ways to improve stress tolerance during fertilization. The heat stress response (HSR) has been intensively studied in vegetative tissues, but is poorly understood during reproductive development. A general paradigm is that HS is accompanied by increased production of reactive oxygen species (ROS) and induction of ROS-scavenging enzymes to protect cells from excess oxidative damage. The activation of the HSR has been linked to cytosolic Ca²⁺ signals, and transcriptional and translational responses, including the increased expression of heat shock proteins (HSPs) and antioxidative pathways. The focus of the proposed research was on two mutations, which have been discovered in a collaboration between the Harper and Miller labs, that either increase or decrease reproductive stress tolerance in a model plant, Arabidopsis thaliana (i.e., cngc16--cyclic nucleotide gated channel 16, apx2-1--ascorbate peroxidase 2,). Major conclusions, solutions, achievements. Using RNA-seq technology, the expression profiles of cngc16 and apx2 pollen grains were independently compared to wild type under favourable conditions and following HS. In comparison to a wild type HSR, there were 2,776 differences in the transcriptome response in cngc16 pollen, consistent with a model in which this heat-sensitive mutant fails to enact or maintain a normal wild-type HSR. In a comparison with apx2 pollen, there were 900 differences in the HSR. Some portion of these 900 differences might contribute to an improved HSR in apx2 pollen. Twenty-seven and 42 transcription factor changes, in cngc16 and apx2-1, respectively, were identified that could provide unique contributions to a pollen HSR. While we found that the functional HS-dependent reprogramming of the pollen transcriptome requires specific activity of CNGC16, we identified in apx2 specific activation of flavonol-biosynthesis pathway and auxin signalling that support a role in pollen thermotolerance. Results from this study have identified metabolic pathways and candidate genes of potential use in improving HS tolerance in pollen. Additionally, we developed new FACS-based methodology that can quantify the stress response for individual pollen in a high-throughput fashion. This technology is being adapted for biological screening of crop plant’s pollen to identify novel thermotolerance traits. Implications, both scientific and agricultural. This study has provided a reference data on the pollen HSR from a model plant, and supports a model that the HSR in pollen has many differences compared to vegetative cells. This provides an important foundation for understanding and improving the pollen HSR, and therefor contributes to the long-term goal of improving productivity in crop plants subjected to temperature stress conditions. A specific hypothesis that has emerged from this study is that pollen thermotolerance can be improved by increasing flavonol accumulation before or during a stress response. Efforts to test this hypothesis have been initiated, and if successful have the potential for application with major seed crops such as maize and rice.
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Ohad, Itzhak, i Himadri Pakrasi. Role of Cytochrome B559 in Photoinhibition. United States Department of Agriculture, grudzień 1995. http://dx.doi.org/10.32747/1995.7613031.bard.

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The aim of this research project was to obtain information on the role of the cytochrome b559 in the function of Photosystem-II (PSII) with special emphasis on the light induced photo inactivation of PSII and turnover of the photochemical reaction center II protein subunit RCII-D1. The major goals of this project were: 1) Isolation and sequencing of the Chlamydomonas chloroplast psbE and psbF genes encoding the cytochrome b559 a and b subunits respectively; 2) Generation of site directed mutants and testing the effect of such mutation on the function of PSII under various light conditions; 3) To obtain further information on the mechanism of the light induced degradation and replacement of the PSII core proteins. This information shall serve as a basis for the understanding of the role of the cytochrome b559 in the process of photoinhibition and recovery of photosynthetic activity as well as during low light induced turnover of the D1 protein. Unlike in other organisms in which the psbE and psbF genes encoding the a and b subunits of cytochrome b559, are part of an operon which also includes the psbL and psbJ genes, in Chlamydomonas these genes are transcribed from different regions of the chloroplast chromosome. The charge distribution of the derived amino-acid sequences of psbE and psbF gene products differs from that of the corresponding genes in other organisms as far as the rule of "positive charge in" is concerned relative to the process of the polypeptide insertion in the thylakoid membrane. However, the sum of the charges of both subunits corresponds to the above rule possibly indicating co-insertion of both subunits in the process of cytochrome b559 assembly. A plasmid designed for the introduction of site-specific mutations into the psbF gene of C. reinhardtii. was constructed. The vector consists of a DNA fragment from the chromosome of C. reinhardtii which spans the region of the psbF gene, upstream of which the spectinomycin-resistance-conferring aadA cassette was inserted. This vector was successfully used to transform wild type C. reinhardtii cells. The spectinomycin resistant strain thus obtained can grow autotrophically and does not show significant changes as compared to the wild-type strain in PSII activity. The following mutations have been introduced in the psbF gene: H23M; H23Y; W19L and W19. The replacement of H23 involved in the heme binding to M and Y was meant to permit heme binding but eventually alter some or all of the electron transport properties of the mutated cytochrome. Tryptophane W19, a strictly conserved residue, is proximal to the heme and may interact with the tetrapyrole ring. Therefore its replacement may effect the heme properties. A change to tyrosine may have a lesser affect on the potential or electron transfer rate while a replacement of W19 by leucine is meant to introduce a more prominent disturbance in these parameters. Two of the mutants, FW19L and FH23M have segregated already and are homoplasmic. The rest are still grown under selection conditions until complete segregation will be obtained. All mutants contain assembled and functional PSII exhibiting an increased sensitivity of PSII to the light. Work is still in progress for the detailed characterization of the mutants PSII properties. A tobacco mutant, S6, obtained by Maliga and coworkers harboring the F26S mutation in the b subunit was made available to us and was characterized. Measurements of PSII charge separation and recombination, polypeptide content and electron flow indicates that this mutation indeed results in light sensitivity. Presently further work is in progress in the detailed characterization of the properties of all the above mutants. Information was obtained demonstrating that photoinactivation of PSII in vivo initiates a series of progressive changes in the properties of RCII which result in an irreversible modification of the RCII-D1 protein leading to its degradation and replacement. The cleavage process of the modified RCII-D1 protein is regulated by the occupancy of the QB site of RCII by plastoquinone. Newly synthesized D1 protein is not accumulated in a stable form unless integrated in reassembled RCII. Thus the degradation of the irreversibly modified RCII-D1 protein is essential for the recovery process. The light induced degradation of the RCII-D1 protein is rapid in mutants lacking the pD1 processing protease such as in the LF-1 mutant of the unicellular alga Scenedesmus obliquus. In this case the Mn binding site of PSII is abolished, the water oxidation process is inhibited and harmful cation radicals are formed following light induced electron flow in PSII. In such mutants photo-inactivation of PSII is rapid, it is not protected by ligands binding at the QB site and the degradation of the inactivated RCII-D1 occurs rapidly also in the dark. Furthermore the degraded D1 protein can be replaced in the dark in absence of light driven redox controlled reactions. The replacement of the RCII-D1 protein involves the de novo synthesis of the precursor protein, pD1, and its processing at the C-terminus end by an unknown processing protease. In the frame of this work, a gene previously isolated and sequenced by Dr. Pakrasi's group has been identified as encoding the RCII-pD1 C-terminus processing protease in the cyanobacterium Synechocystis sp. PCC 6803. The deduced sequence of the ctpA protein shows significant similarity to the bovine, human and insect interphotoreceptor retinoid-binding proteins. Results obtained using C. reinhardtii cells exposes to low light or series of single turnover light flashes have been also obtained indicating that the process of RCII-D1 protein turnover under non-photoinactivating conditions (low light) may be related to charge recombination in RCII due to back electron flow from the semiquinone QB- to the oxidised S2,3 states of the Mn cluster involved in the water oxidation process.
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