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  • 1
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The rabbit lens can be maintained in culture under conditions which retain the block to proliferation characteristic of many of the cells in the normal tissue in vivo. Proliferation and cell migration subsequently can be triggered at will by the addition of serum to the medium. Serum is not required throughout the whole period of culture in order to elicit this response but only during an initial period which ends prior to the onset of both DNA synthesis and mitosis. The duration of this period of serum-dependency is specifically related to the location (and hence the state of organization) of the cells within the epithelial layer. Some of the characteristics of the serum factors which promote these reactions and the conditions of culture which affect their activity are reported.
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  • 2
    ISSN: 0197-8462
    Keywords: magnetic fields ; exposure system ; stray fields ; Merritt coils ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Exposure systems that provide good magnetic field uniformity, minimum stray fields, and minimal heating, vibration, and hum, as well as capability for true sham exposure in which current flows in the coils, are needed to determine rigorously the biological effects of weak magnetic fields. Designs based on acrylic polymer coil support structures and twisted pair bifilary coil windings were employed to fabricate several different systems for the exposure of laboratory animals and cell cultures to magnetic fields. These systems exhibit excellent performance characteristics in terms of exposure field uniformity, stray field containment, and exposure field cancellation in the sham exposure mode. A custom-written computer program was used to determine the best arrangement for coils with regard to field uniformity in the exposure volume and stray field containment. For in vivo exposures, modules were made up of four Merritt four-coil sets, built into a single structure and positioned to form an octapole with fields directed in the horizontal plane. For in vitro applications, two different coil configurations were selected to produce the vertical fields required. A quadrupole system, comprising modules consisting of two Merritt four-coil sets arranged side by side to limit stray fields, was built as a prototype. In the second configuration, one Merritt four-coil set was positioned inside the other to form a concentric coil set. In both in vitro systems, exposure chambers were connected to remote commercial incubators in order to reduce ambient magnetic fields in the exposure volume. An active field cancellation circuit was developed for reducing ambient AC magnetic fields in the in vitro sham exposure chamber, when necessary. These design and fabrication approaches provide systems that offer uniform field exposures and excellent stray field containment when needed and are portable, washable, and relatively inexpensive. © 1994 Wiley-Liss, Inc.This article is a US Government work and, as such, is in the public domain in the United States of America.
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  • 3
    Publication Date: 2010-08-06
    Description: Plasma concentrations of total cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol and triglycerides are among the most important risk factors for coronary artery disease (CAD) and are targets for therapeutic intervention. We screened the genome for common variants associated with plasma lipids in 〉100,000 individuals of European ancestry. Here we report 95 significantly associated loci (P 〈 5 x 10(-8)), with 59 showing genome-wide significant association with lipid traits for the first time. The newly reported associations include single nucleotide polymorphisms (SNPs) near known lipid regulators (for example, CYP7A1, NPC1L1 and SCARB1) as well as in scores of loci not previously implicated in lipoprotein metabolism. The 95 loci contribute not only to normal variation in lipid traits but also to extreme lipid phenotypes and have an impact on lipid traits in three non-European populations (East Asians, South Asians and African Americans). Our results identify several novel loci associated with plasma lipids that are also associated with CAD. Finally, we validated three of the novel genes-GALNT2, PPP1R3B and TTC39B-with experiments in mouse models. Taken together, our findings provide the foundation to develop a broader biological understanding of lipoprotein metabolism and to identify new therapeutic opportunities for the prevention of CAD.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3039276/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3039276/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Teslovich, Tanya M -- Musunuru, Kiran -- Smith, Albert V -- Edmondson, Andrew C -- Stylianou, Ioannis M -- Koseki, Masahiro -- Pirruccello, James P -- Ripatti, Samuli -- Chasman, Daniel I -- Willer, Cristen J -- Johansen, Christopher T -- Fouchier, Sigrid W -- Isaacs, Aaron -- Peloso, Gina M -- Barbalic, Maja -- Ricketts, Sally L -- Bis, Joshua C -- Aulchenko, Yurii S -- Thorleifsson, Gudmar -- Feitosa, Mary F -- Chambers, John -- Orho-Melander, Marju -- Melander, Olle -- Johnson, Toby -- Li, Xiaohui -- Guo, Xiuqing -- Li, Mingyao -- Shin Cho, Yoon -- Jin Go, Min -- Jin Kim, Young -- Lee, Jong-Young -- Park, Taesung -- Kim, Kyunga -- Sim, Xueling -- Twee-Hee Ong, Rick -- Croteau-Chonka, Damien C -- Lange, Leslie A -- Smith, Joshua D -- Song, Kijoung -- Hua Zhao, Jing -- Yuan, Xin -- Luan, Jian'an -- Lamina, Claudia -- Ziegler, Andreas -- Zhang, Weihua -- Zee, Robert Y L -- Wright, Alan F -- Witteman, Jacqueline C M -- Wilson, James F -- Willemsen, Gonneke -- Wichmann, H-Erich -- Whitfield, John B -- Waterworth, Dawn M -- Wareham, Nicholas J -- Waeber, Gerard -- Vollenweider, Peter -- Voight, Benjamin F -- Vitart, Veronique -- Uitterlinden, Andre G -- Uda, Manuela -- Tuomilehto, Jaakko -- Thompson, John R -- Tanaka, Toshiko -- Surakka, Ida -- Stringham, Heather M -- Spector, Tim D -- Soranzo, Nicole -- Smit, Johannes H -- Sinisalo, Juha -- Silander, Kaisa -- Sijbrands, Eric J G -- Scuteri, Angelo -- Scott, James -- Schlessinger, David -- Sanna, Serena -- Salomaa, Veikko -- Saharinen, Juha -- Sabatti, Chiara -- Ruokonen, Aimo -- Rudan, Igor -- Rose, Lynda M -- Roberts, Robert -- Rieder, Mark -- Psaty, Bruce M -- Pramstaller, Peter P -- Pichler, Irene -- Perola, Markus -- Penninx, Brenda W J H -- Pedersen, Nancy L -- Pattaro, Cristian -- Parker, Alex N -- Pare, Guillaume -- Oostra, Ben A -- O'Donnell, Christopher J -- Nieminen, Markku S -- Nickerson, Deborah A -- Montgomery, Grant W -- Meitinger, Thomas -- McPherson, Ruth -- McCarthy, Mark I -- McArdle, Wendy -- Masson, David -- Martin, Nicholas G -- Marroni, Fabio -- Mangino, Massimo -- Magnusson, Patrik K E -- Lucas, Gavin -- Luben, Robert -- Loos, Ruth J F -- Lokki, Marja-Liisa -- Lettre, Guillaume -- Langenberg, Claudia -- Launer, Lenore J -- Lakatta, Edward G -- Laaksonen, Reijo -- Kyvik, Kirsten O -- Kronenberg, Florian -- Konig, Inke R -- Khaw, Kay-Tee -- Kaprio, Jaakko -- Kaplan, Lee M -- Johansson, Asa -- Jarvelin, Marjo-Riitta -- Janssens, A Cecile J W -- Ingelsson, Erik -- Igl, Wilmar -- Kees Hovingh, G -- Hottenga, Jouke-Jan -- Hofman, Albert -- Hicks, Andrew A -- Hengstenberg, Christian -- Heid, Iris M -- Hayward, Caroline -- Havulinna, Aki S -- Hastie, Nicholas D -- Harris, Tamara B -- Haritunians, Talin -- Hall, Alistair S -- Gyllensten, Ulf -- Guiducci, Candace -- Groop, Leif C -- Gonzalez, Elena -- Gieger, Christian -- Freimer, Nelson B -- Ferrucci, Luigi -- Erdmann, Jeanette -- Elliott, Paul -- Ejebe, Kenechi G -- Doring, Angela -- Dominiczak, Anna F -- Demissie, Serkalem -- Deloukas, Panagiotis -- de Geus, Eco J C -- de Faire, Ulf -- Crawford, Gabriel -- Collins, Francis S -- Chen, Yii-der I -- Caulfield, Mark J -- Campbell, Harry -- Burtt, Noel P -- Bonnycastle, Lori L -- Boomsma, Dorret I -- Boekholdt, S Matthijs -- Bergman, Richard N -- Barroso, Ines -- Bandinelli, Stefania -- Ballantyne, Christie M -- Assimes, Themistocles L -- Quertermous, Thomas -- Altshuler, David -- Seielstad, Mark -- Wong, Tien Y -- Tai, E-Shyong -- Feranil, Alan B -- Kuzawa, Christopher W -- Adair, Linda S -- Taylor, Herman A Jr -- Borecki, Ingrid B -- Gabriel, Stacey B -- Wilson, James G -- Holm, Hilma -- Thorsteinsdottir, Unnur -- Gudnason, Vilmundur -- Krauss, Ronald M -- Mohlke, Karen L -- Ordovas, Jose M -- Munroe, Patricia B -- Kooner, Jaspal S -- Tall, Alan R -- Hegele, Robert A -- Kastelein, John J P -- Schadt, Eric E -- Rotter, Jerome I -- Boerwinkle, Eric -- Strachan, David P -- Mooser, Vincent -- Stefansson, Kari -- Reilly, Muredach P -- Samani, Nilesh J -- Schunkert, Heribert -- Cupples, L Adrienne -- Sandhu, Manjinder S -- Ridker, Paul M -- Rader, Daniel J -- van Duijn, Cornelia M -- Peltonen, Leena -- Abecasis, Goncalo R -- Boehnke, Michael -- Kathiresan, Sekar -- 068545/Z/02/Wellcome Trust/United Kingdom -- 076113/B/04/Z/Wellcome Trust/United Kingdom -- 077016/Z/05/Z/Wellcome Trust/United Kingdom -- 079895/Wellcome Trust/United Kingdom -- 1Z01 HG000024/HG/NHGRI NIH HHS/ -- 5R01DK06833603/DK/NIDDK NIH HHS/ -- 5R01DK07568102/DK/NIDDK NIH HHS/ -- 5R01HL087679-02/HL/NHLBI NIH HHS/ -- 5R01HL08770003/HL/NHLBI NIH HHS/ -- 5R01HL08821502/HL/NHLBI NIH HHS/ -- CA 047988/CA/NCI NIH HHS/ -- CZB/4/710/Chief Scientist Office/United Kingdom -- DK062370/DK/NIDDK NIH HHS/ -- DK063491/DK/NIDDK NIH HHS/ -- DK072193/DK/NIDDK NIH HHS/ -- DK078150/DK/NIDDK NIH HHS/ -- DK56350/DK/NIDDK NIH HHS/ -- ES10126/ES/NIEHS NIH HHS/ -- G0000934/Medical Research Council/United Kingdom -- G0401527/Medical Research Council/United Kingdom -- G0601966/Medical Research Council/United Kingdom -- G0700931/Medical Research Council/United Kingdom -- G0701863/Medical Research Council/United Kingdom -- G0801056/Medical Research Council/United Kingdom -- G0801566/Medical Research Council/United Kingdom -- G9521010/Medical Research Council/United Kingdom -- G9521010D/Medical Research Council/United Kingdom -- HHSN268200625226C/PHS HHS/ -- HL 04381/HL/NHLBI NIH HHS/ -- HL 080467/HL/NHLBI NIH HHS/ -- HL-54776/HL/NHLBI NIH HHS/ -- HL085144/HL/NHLBI NIH HHS/ -- K99 HL098364/HL/NHLBI NIH HHS/ -- K99 HL098364-01/HL/NHLBI NIH HHS/ -- K99HL094535/HL/NHLBI NIH HHS/ -- M01-RR00425/RR/NCRR NIH HHS/ -- MC_QA137934/Medical Research Council/United Kingdom -- MC_U106179471/Medical Research Council/United Kingdom -- MC_U106188470/Medical Research Council/United Kingdom -- MC_U127561128/Medical Research Council/United Kingdom -- N01 HC-15103/HC/NHLBI NIH HHS/ -- N01 HC-55222/HC/NHLBI NIH HHS/ -- N01-AG-12100/AG/NIA NIH HHS/ -- N01-HC-25195/HC/NHLBI NIH HHS/ -- N01-HC-35129/HC/NHLBI NIH HHS/ -- N01-HC-45133/HC/NHLBI NIH HHS/ -- N01-HC-55015/HC/NHLBI NIH HHS/ -- N01-HC-55016/HC/NHLBI NIH HHS/ -- N01-HC-55018/HC/NHLBI NIH HHS/ -- N01-HC-55019/HC/NHLBI NIH HHS/ -- N01-HC-55020/HC/NHLBI NIH HHS/ -- N01-HC-55021/HC/NHLBI NIH HHS/ -- N01-HC-55022/HC/NHLBI NIH HHS/ -- N01-HC-75150/HC/NHLBI NIH HHS/ -- N01-HC-85079/HC/NHLBI NIH HHS/ -- N01-HC-85080/HC/NHLBI NIH HHS/ -- N01-HC-85081/HC/NHLBI NIH HHS/ -- N01-HC-85082/HC/NHLBI NIH HHS/ -- N01-HC-85083/HC/NHLBI NIH HHS/ -- N01-HC-85084/HC/NHLBI NIH HHS/ -- N01-HC-85085/HC/NHLBI NIH HHS/ -- N01-HC-85086/HC/NHLBI NIH HHS/ -- N01-HG-65403/HG/NHGRI NIH HHS/ -- N02-HL-6-4278/HL/NHLBI NIH HHS/ -- PG/02/128/British Heart Foundation/United Kingdom -- PG/08/094/British Heart Foundation/United Kingdom -- PG/08/094/26019/British Heart Foundation/United Kingdom -- R01 DK072193/DK/NIDDK NIH HHS/ -- R01 DK078150/DK/NIDDK NIH HHS/ -- R01 HL087647/HL/NHLBI NIH HHS/ -- R01 HL087676/HL/NHLBI NIH HHS/ -- R01 HL089650/HL/NHLBI NIH HHS/ -- R01HL086694/HL/NHLBI NIH HHS/ -- R01HL087641/HL/NHLBI NIH HHS/ -- R01HL087652/HL/NHLBI NIH HHS/ -- R01HL59367/HL/NHLBI NIH HHS/ -- R24 HD050924/HD/NICHD NIH HHS/ -- RC1 HL099634/HL/NHLBI NIH HHS/ -- RC1 HL099634-02/HL/NHLBI NIH HHS/ -- RC1 HL099793/HL/NHLBI NIH HHS/ -- RC2 HL101864,/HL/NHLBI NIH HHS/ -- RC2 HL102419/HL/NHLBI NIH HHS/ -- RG/07/005/23633/British Heart Foundation/United Kingdom -- RR20649/RR/NCRR NIH HHS/ -- SP/08/005/25115/British Heart Foundation/United Kingdom -- T32 GM007092/GM/NIGMS NIH HHS/ -- T32 HG00040/HG/NHGRI NIH HHS/ -- T32HL007208/HL/NHLBI NIH HHS/ -- TW05596/TW/FIC NIH HHS/ -- U01 DK062370/DK/NIDDK NIH HHS/ -- U01 DK062418/DK/NIDDK NIH HHS/ -- U01 HL069757/HL/NHLBI NIH HHS/ -- U01 HL080295/HL/NHLBI NIH HHS/ -- U01HG004402/HG/NHGRI NIH HHS/ -- U54 RR020278/RR/NCRR NIH HHS/ -- UL1RR025005/RR/NCRR NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2010 Aug 5;466(7307):707-13. doi: 10.1038/nature09270.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Statistical Genetics, Department of Biostatistics, University of Michigan, Ann Arbor, Michigan 48109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20686565" target="_blank"〉PubMed〈/a〉
    Keywords: African Americans/genetics ; Animals ; Asian Continental Ancestry Group/genetics ; Cholesterol, HDL/blood ; Cholesterol, LDL/blood ; Coronary Artery Disease/blood/genetics/therapy ; Europe/ethnology ; European Continental Ancestry Group/genetics ; Female ; Genetic Loci/*genetics ; *Genome-Wide Association Study ; Genotype ; Humans ; Lipid Metabolism/*genetics ; Lipids/*blood ; Liver/metabolism ; Male ; Mice ; N-Acetylgalactosaminyltransferases/genetics/metabolism ; Phenotype ; Polymorphism, Single Nucleotide/genetics ; Protein Phosphatase 1/genetics/metabolism ; Reproducibility of Results ; Triglycerides/blood
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2012-01-13
    Description: Retinoblastoma is an aggressive childhood cancer of the developing retina that is initiated by the biallelic loss of RB1. Tumours progress very quickly following RB1 inactivation but the underlying mechanism is not known. Here we show that the retinoblastoma genome is stable, but that multiple cancer pathways can be epigenetically deregulated. To identify the mutations that cooperate with RB1 loss, we performed whole-genome sequencing of retinoblastomas. The overall mutational rate was very low; RB1 was the only known cancer gene mutated. We then evaluated the role of RB1 in genome stability and considered non-genetic mechanisms of cancer pathway deregulation. For example, the proto-oncogene SYK is upregulated in retinoblastoma and is required for tumour cell survival. Targeting SYK with a small-molecule inhibitor induced retinoblastoma tumour cell death in vitro and in vivo. Thus, retinoblastomas may develop quickly as a result of the epigenetic deregulation of key cancer pathways as a direct or indirect result of RB1 loss.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3289956/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3289956/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Jinghui -- Benavente, Claudia A -- McEvoy, Justina -- Flores-Otero, Jacqueline -- Ding, Li -- Chen, Xiang -- Ulyanov, Anatoly -- Wu, Gang -- Wilson, Matthew -- Wang, Jianmin -- Brennan, Rachel -- Rusch, Michael -- Manning, Amity L -- Ma, Jing -- Easton, John -- Shurtleff, Sheila -- Mullighan, Charles -- Pounds, Stanley -- Mukatira, Suraj -- Gupta, Pankaj -- Neale, Geoff -- Zhao, David -- Lu, Charles -- Fulton, Robert S -- Fulton, Lucinda L -- Hong, Xin -- Dooling, David J -- Ochoa, Kerri -- Naeve, Clayton -- Dyson, Nicholas J -- Mardis, Elaine R -- Bahrami, Armita -- Ellison, David -- Wilson, Richard K -- Downing, James R -- Dyer, Michael A -- CA21765/CA/NCI NIH HHS/ -- CA64402/CA/NCI NIH HHS/ -- EY014867/EY/NEI NIH HHS/ -- EY018599/EY/NEI NIH HHS/ -- GM81607/GM/NIGMS NIH HHS/ -- R01 CA155202/CA/NCI NIH HHS/ -- R01 EY014867/EY/NEI NIH HHS/ -- R01 EY014867-02/EY/NEI NIH HHS/ -- R01 EY018599/EY/NEI NIH HHS/ -- R01 EY018599-03/EY/NEI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2012 Jan 11;481(7381):329-34. doi: 10.1038/nature10733.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Computational Biology and Bioinformatics, St Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22237022" target="_blank"〉PubMed〈/a〉
    Keywords: Aneuploidy ; Animals ; Cell Death/drug effects ; Cell Line ; Cell Survival/drug effects ; Chromosomal Instability/genetics ; Epigenesis, Genetic/*genetics ; Gene Expression Regulation, Neoplastic ; Genes, Retinoblastoma/genetics ; *Genomics ; Humans ; Intracellular Signaling Peptides and Proteins/antagonists & ; inhibitors/genetics/metabolism ; Mice ; *Molecular Targeted Therapy ; Mutation/genetics ; Protein Kinase Inhibitors/*pharmacology/therapeutic use ; Protein-Tyrosine Kinases/antagonists & inhibitors/genetics/metabolism ; Retinoblastoma/*drug therapy/*genetics/pathology ; Retinoblastoma Protein/deficiency/genetics ; Sequence Analysis, DNA ; Xenograft Model Antitumor Assays
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 152 (1974), S. 525-542 
    ISSN: 1432-0878
    Keywords: Nidation ; Mice ; Cell interaction ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The interaction between the trophoblast and the maternal epithelium at early implantation was studied by means of light and electron microscopy. The uterine horns were fixed in situ and a double-embedding method was used to locate implantation sites. Observations were made on mice killed at 2 hour intervals 90–116 h. post coitum which covered the following stages: pre-attachment (i) with zona pellucida intact (ii) with zona pellucida in dissolution (iii) after loss of the zona; attachment; adherence; and invasion. The intact zona pellucida was electron opaque and of uniform density. In the stage of apparent dissolution it became electron dense and was trapped between trophoblast and epithelium. At preattachment the trophoblast cells were round. Subsequently they became long and attenuated, often with lysosomes in the cytoplasm proximal to the epithelial layer. Epithelial cells, which could be seen in various stages of degeneration were apparently phagocytosed by the trophoblast. Occasional pyknotic epithelial cells were seen, as well as some apparently normal ones which contained cytosegresomes. The possible reasons for their presence are discussed. The microvilli of the epithelial cells changed from regular and pointed at preattachment to short and irregular at adherence and invasion.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 15 (1899), S. 667-696 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 22 (1911), S. 71-110 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 9 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 53 (1932), S. 443-471 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A cyst of tetraploid first spermatocyte metaphases is described in the coreid hemipter Archimerus alternatus (Say), all other divisions in the testis being of normal diploid constitution. The striking fact is that in spite of the doubling of their number the chromosomes closely follow the group pattern characteristic of the corresponding normal divisions. In the latter the first metaphase always shows a ring of six autosome bivalents with a single m-chromosome bivalent at its center and a single univalent X-chromosome lying outside the ring (as in coreids generally). In corresponding tetraploids the numbers are respectively 12, 2, and 2. Three additional interesting features of the tetraploids are: 1) the fact that the two m-bivalents are always lined up end to end to form an axial quadrivalent chain; 2) that although two X-chromosomes are present (as in the normal female), they are never united to form a bivalent as in that sex; and, 3) that in the prophases (of which a few are present in the cyst), at least one pycnotic X, or chromosome nucleolus, is present.A critical discussion is offered of the general problem of the mechanism of chromosome movements and groupings, together with a review of recent literature. The conclusion is urged that the chromosomes themselves play an active and important part in these processes, and the possible genetic relations between chromosomes and spindle substance are discussed.
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 60 (1937), S. 407-443 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The Mexican scorpion Centruroides shows exactly the same type of chondriokinesis (by ring formation) as that hitherto known only in the related form Centrurus, as earlier reported by one of us ('31). The Golgi bodies show no trace of ring formation but are distributed by random assortment like that of the chondriosomes in other scorpions. The Golgi bodies, clearly visible in vivo, show the typical plate-like or lamellar structure characteristic of them in other forms. In the first division, after Weigl, there appear to be two metaphase stages, an earlier one in which the dictyosomes are irregularly scattered and a later one in which they tend to mass near the mitotic poles. In the same division, after Champy-Kull, the (presumable) dictyosomes are regularly massed near the poles and may be traced through the whole mitosis. The neural red bodies (‘vacuome’) undergo an irregular distribution and are cast out in the slough. The problem of distribution and localization in the sperm-cell formation are discussed with reference to the principle of genetic continuity in the germ cell.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 66 (1940), S. 463-479 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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