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... The developmental origins of both the epithelial and lymphocytic components of the thymus have been sources of controversy within the field. Lymphocytes were proposed to originate either from transformation of epithelium within the rudiment or from immigration from extrathymic sources. In an early e ...
To be or not to be alive: How recent discoveries challenge the
To be or not to be alive: How recent discoveries challenge the

... with phages studied by microbiologists and viruses by cellular biologists (cells being frequently assimilated to eukaryotic cells). The phage/virus paradigm persists because the “eukaryote/prokaryote” dichotomy became itself a paradigm that has remained dominant in cell biology until now (Pace, 2006 ...
SKIP controls lysosome positioning using a composite kinesin
SKIP controls lysosome positioning using a composite kinesin

... 2014; Vale, 2003; Vale et al., 1985; Verhey and Hammond, 2009b). Kinesin-1 is hijacked by pathogens including vaccinia virus, herpes viruses and HIV-1 during infection, as well as bacteria that replicate inside the cell such as Salmonella (Boucrot et al., 2005; Dodding and Way, 2011; Dumont et al., ...
Splice switching efficiency and specificity for oligonucleotides
Splice switching efficiency and specificity for oligonucleotides

... boundaries during pre-mRNA splicing [1]. Manipulation of pre-mRNA splicing is one approach to find novel therapies for inherited diseases such as cystic fibrosis [2], βthalassemia [3] and Duchenne’s muscular dystrophy [4]. An application that has gained increasing attention since its initial discove ...
Novel Regulators of Vascular Development in Arabidopsis
Novel Regulators of Vascular Development in Arabidopsis

... Xylem, the water transporting tissue, differentiates from the procambium during primary development, as mentioned above. In the Arabidopsis root, 4–5 cell files of xylem vessels are formed in the central axis of the vascular cylinder (Figure 2). During differentiation, the xylem vessels develop lign ...
The mating pair stabilization protein, TraN, of the F plasmid is an
The mating pair stabilization protein, TraN, of the F plasmid is an

... ability. TraN is a hallmark protein of F-type IV secretion systems as demonstrated by BLAST searches of the databases. The C-terminal region is highly conserved and contains five of the six completely conserved cysteines. Mutation of these residues to serine demonstrated their importance in TraN fun ...
Arrested Differentiation of Proplastids into Chloroplasts in
Arrested Differentiation of Proplastids into Chloroplasts in

... from the tip to the middle part of the FTL at 6 d. These data suggested that this is the stage where cells are destined to undergo normal chloroplast differentiation or a possible arrest of thylakoid development (feature 1, Fig. 6). Secondly, cells in green sectors form normal chloroplasts, but this ...
Wing Surface of Lepidopteran Insects (Butterflies and Moths
Wing Surface of Lepidopteran Insects (Butterflies and Moths

... were rarely adjacent; c-b’s, which are alternation units, are repeated in most regions of the scale rows while c-c-b’s and c-b-b’s, which are unalternation units, were rarely observed (Yoshida and Aoki, 1989). The ratio of the number of c-c-b and c-b-b to the total number of c-b, c-c-b, and c-b-b wa ...
OPTIMISATION OF CHO CELL GROWTH AND
OPTIMISATION OF CHO CELL GROWTH AND

... A statistical approach was used to identify important culture components for cell growth and LFN-y production. When the concentration of the resulting positive variables was initially increased in culture, improvements of approximately 40% in both of these parameters were achieved; the glycosylation ...
Homeomorphisms between homotopy manifolds and their resolutions
Homeomorphisms between homotopy manifolds and their resolutions

... topological manifold. This is demonstrated by Siebenmann in [10]. He omits the proof in the case where 0M :~0, but this is supplied by Glaser 1,4] in his recent work on homotopy manifolds. (It is unknown at present March, 1970 - whether every triangulated topological manifold is, in fact, a homotopy ...
Exploring glycoside hydrolase family 5 (GH5) enzymes
Exploring glycoside hydrolase family 5 (GH5) enzymes

... which they usually tightly bind onto the surface of cellulose via hydrogen bonds. Galactoglucomannan, glucomannan, arabinoglucoronoxylan, glucuronoxylan and xyloglucan (XG) are examples of common and abundant plant cell wall hemicelluloses [17]. In primary walls of dicotyledonous plants, XG is the m ...
A GH3-like Domain in Reaper Is Required for Mitochondrial
A GH3-like Domain in Reaper Is Required for Mitochondrial

... SMAC, an IAP inhibitory protein that, in its cytoplasmically released form, carries an N-terminal IBM motif (23, 24). Like Reaper, HID, and Grim, SMAC can interfere with IAP-mediated caspase inhibition. However, unlike the fly IBM proteins, SMAC does not appear to be a potent cell killer, consistent ...
Bacteriochlorophyll-Synthesizing Budding Bacterium
Bacteriochlorophyll-Synthesizing Budding Bacterium

... Erythrobacter longus. They also differ from members of the Plunctomycetules phenotypically in their synthesis of bacteriochlorophylland possession of a peptidoglycan cell wall. They can be distinguished from E. longus on the basis of their 16s rRNA sequence, the G+C content of their DNA, cellular fa ...
Light and Electron Microscopy of the Sheath of a Blue
Light and Electron Microscopy of the Sheath of a Blue

... portions sloughed off, it stained with Alcian blue and was probably polysaccharide. The sheath formed salt-like complexes with proteins at appropriate low pH values which rendered it visible by phase-contrast microscopy. The composition of the culture medium influenced sheath formation. Electron mic ...
Formation and excretion of autophagic plastids (plastolysomes) in
Formation and excretion of autophagic plastids (plastolysomes) in

... e-mail: [email protected] ...
Saliva of the Lyme Disease Vector, Lxodes dammini, Blocks
Saliva of the Lyme Disease Vector, Lxodes dammini, Blocks

... inoculation but these responses are greatly delayed or are nonexistent in animals infected with similar numbers of spirochetes delivered by infected ticks (12, 13). This suggests that tick saliva modifies the host-specific T and B cell response to the Lyme spirochete. However, the immunological mech ...
BTK, THE TYROSINE KINASE AFFECTED IN X-LINKED
BTK, THE TYROSINE KINASE AFFECTED IN X-LINKED

... Several PH domains have been found to associate with different phosphoinositides (56-65). It is possible that some PH domains serve as membrane-binding/associating units. Recently, PH domain of human βIΣII spectrin was localized to the plasma membrane in vivo (66). Dbl PH domains may mediate cellula ...
The Ovule and the Embryo Sac
The Ovule and the Embryo Sac

... The plant life cycle is characterized by the alternation of generations between a diploid sporophyte and a haploid gametophyte. The sporophyte functions to produce spores, which then develop into gametophytes. The differentiated gametophytes in turn produce either the male gametes (sperm) or female ...
1 - Utrecht University Repository
1 - Utrecht University Repository

Prions: Infectious Proteins with Genetic Properties
Prions: Infectious Proteins with Genetic Properties

... diseases may be explained by the increased ability of mutant proteins to convert into the pathogenic form. Two models have been suggested to explain rearrangement of the PrPC protein into the PrPSc form. According to the “heterodimer” model, the prion state is inherent for the monomer of PrP protein ...
POS-1 and germ cell specification
POS-1 and germ cell specification

... mex-1 appears to play a distinct role from pie-1, because at least some transcription is properly repressed in the germline blastomeres of mex-1 mutants (Guedes and Priess, 1997). PIE1 is a novel, predominantly nuclear, protein of unknown function that is localized to a germline blastomere at each o ...
Exocytosis acts as a modulator of the ILT4
Exocytosis acts as a modulator of the ILT4

... None ...
Malva verticillata seed extracts upregulate the Wnt pathway in
Malva verticillata seed extracts upregulate the Wnt pathway in

... Factors secreted from dermal papilla cells (DPCs) directly influence the surrounding matrix cells either to proliferate and differentiate or to stimulate hair stem cells to initiate a new anagen phase [5]. The Wnt/b-catenin pathway is known to be essential for these biological processes in hair foll ...
High-Molecular-Weight Forms of Tyrosinase and the
High-Molecular-Weight Forms of Tyrosinase and the

... TRP-2 migrated exclusively in a hig h - molecul ar-we ig ht form, as expected from its behavior on mol ecul ar sieve HPLC (Fig 1b, bottom). No TRP-2 was detected in association with th e peak of "free" tyrosinase from HPLC (Fig lb, lOp), Triton X-1 00 was used only in the initial phase of the purifi ...
Nitric Oxide Inhibits Matrix Metalloproteinase
Nitric Oxide Inhibits Matrix Metalloproteinase

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Amitosis

Amitosis (a- + mitosis) is absence of mitosis, the usual form of cell division in the cells of eukaryotes. There are several senses in which eukaryotic cells can be amitotic. One refers to capability for non-mitotic division and the other refers to lack of capability for division. In one sense of the word, which is now mostly obsolete, amitosis is cell division in eukaryotic cells that happens without the usual features of mitosis as seen on microscopy, namely, without nuclear envelope breakdown and without formation of mitotic spindle and condensed chromosomes as far as microscopy can detect. However, most examples of cell division formerly thought to belong to this supposedly ""non-mitotic"" class, such as the division of unicellular eukaryotes, are today recognized as belonging to a class of mitosis called closed mitosis. A spectrum of mitotic activity can be categorized as open, semi-closed, and closed mitosis, depending on the fate of the nuclear envelope. An exception is the division of ciliate macronucleus, which is not mitotic, and the reference to this process as amitosis may be the only legitimate use of the ""non-mitotic division"" sense of the term today. In animals and plants which normally have open mitosis, the microscopic picture described in the 19th century as amitosis most likely corresponded to apoptosis, a process of programmed cell death associated with fragmentation of the nucleus and cytoplasm. Relatedly, even in the late 19th century cytologists mentioned that in larger life forms, amitosis is a ""forerunner of degeneration"".Another sense of amitotic refers to cells of certain tissues that are usually no longer capable of mitosis once the organism has matured into adulthood. In humans this is true of various muscle and nerve tissue types; if the existing ones are damaged, they cannot be replaced with new ones of equal capability. For example, cardiac muscle destroyed by heart attack and nerves destroyed by piercing trauma usually cannot regenerate. In contrast, skin cells are capable of mitosis throughout adulthood; old skin cells that die and slough off are replaced with new ones. Human liver tissue also has a sort of dormant regenerative ability; it is usually not needed or expressed but can be elicited if needed.
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