Abstract：
:Rates of movement of univalents at prometaphase and of half-bivalents at anaphase in living cricket and grasshopper spermatocytes were determined as a function of the distance from the pole toward which the movement was directed. In the artificially produced univalents of cricket cells, correlation coefficients for rate versus distance form the pole were widely disparate from movement to movement and there was no consistent relationship between velocity and distance from the pole. However, in the naturally occurring univalents of grasshopper cells, there was a significant positive correlation between velocity and distance from the pole. In both cricket and grasshopper cells, there was no consistent correlation between rate of movement and distance from the pole for half-bivalents at anaphase. The prometaphase data from grasshopper cells support the simple hypothesis of Ostergren (1950) that congression results from the application to chromosomes of forces which increase with increasing distance from the pole. Furthermore, these data are consistent with models of force production which suppose that the relationship between force (reflected as velocity) and distance from the pole is a linear one.
journal_name
Chromosomajournal_title
Chromosomaauthors
Wise Ddoi
10.1007/BF00329921subject
Has Abstractpub_date
1978-11-22 00:00:00pages
231-41issue
2eissn
0009-5915issn
1432-0886journal_volume
69pub_type
杂志文章相关文献
CHROMOSOMA文献大全abstract：:Previous studies of the Robertsonian polymorphism in the Atlantic dog-whelk, Nucella lapillus (2n = 26-36), have been limited by the inability to identify unequivocally individual chromosomes in the karyotype. This species, as with many other marine invertebrates, has proven largely refractory to the standard (mammali...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00352269
更新日期：1996-03-01 00:00:00
abstract：:The putative nucleolus in Saccharomyces cerevisiae is visible in electron micrographs as a darkly stained, crescent-shaped structure associated with the nuclear envelope. The haploid yeast genome contains 100-200 tandem copies of a 9.1 kb ribosomal DNA (rDNA) repeat predicted to reside in this structure. We combined i...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00352202
更新日期：1991-09-01 00:00:00
abstract：:The immunodeficiency, centromeric region instability, facial anomalies (ICF) syndrome is a rare autosomal recessive disease. Usually, it is caused by mutations in the DNA methyltransferase 3B gene, which result in decreased methylation of satellite DNA in the juxtacentromeric heterochromatin at 1qh, 16qh, and 9qh. Sat...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s00412-005-0343-7
更新日期：2005-07-01 00:00:00
abstract：:Dioecious species accounted for 6% of all plant species, including a number of crops and economically important species, such as poplar. However, sex determination and sex chromosome evolution have been studied only in few dioecious species. In poplar, the sex-determining locus was mapped to chromosome 19. Interesting...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s00412-018-0664-y
更新日期：2018-09-01 00:00:00
abstract：:Heterochromatin in eukaryotic interphase cells frequently localizes to the nucleolar periphery (nucleolus-associated domains (NADs)) and the nuclear lamina (lamina-associated domains (LADs)). Gene expression in somatic cell NADs is generally low, but NADs have not been characterized in mammalian stem cells. Here, we g...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s00412-020-00734-9
更新日期：2020-06-01 00:00:00
abstract：:A clone of highly repetitive DNA, designated C5, was isolated from DNA of female Chinese muntjac cells. The nucleotide sequence of this clone is 80%-85% homologous to that of the satellite IA clone and other highly repetitive DNA clones previously obtained from the Indian muntjac. Using C5 as a probe for in situ hybri...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00360682
更新日期：1991-10-01 00:00:00
abstract：:Meiosis is a conserved cell division process that is used by sexually reproducing organisms to generate haploid gametes. Males and females produce different end products of meiosis: eggs (females) and sperm (males). In addition, these unique end products demonstrate sex-specific differences that occur throughout meios...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s00412-019-00692-x
更新日期：2019-09-01 00:00:00
abstract：:With an improved N-banding technique, the location of nucleolar organizing region was determined in 27 kinds of material including mammals, a marsupial, birds, amphibians, fishes, an insect and plants. In most cases the N-bands were clearly located on certain specific regions of chromosomes, such as the secondary cons...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00285128
更新日期：1975-01-01 00:00:00
abstract：:Position-effect variegation (PEV) is the mosaic expression of a euchromatic gene brought into juxtaposition with heterochromatin. Fourteen different transformed Drosophila melanogaster lines with variegating P-element inserts were used to examine the DNA levels of these transgenes. Insert sites include pericentric, te...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00352116
更新日期：1996-04-01 00:00:00
abstract：:DNA reassociation kinetics were studied, by means of the hydroxyapatite chromatography method, for four species of Amphibians with different nuclear DNA content: Xenopus laevis (3 pg DNA per haploid genome) and Bufo bufo (7 pg) of the Anura subclass and Triturus cristatus (23 pg) and Necturus maculosus (52 pg) of the ...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00327706
更新日期：1976-12-06 00:00:00
abstract：:We describe a mammalian artificial mini-chromosome lacking human alphoid DNA and mouse minor and major satellite DNA repeats. This mini-chromosome, initially recovered in a mouse embryonic stem (ES) cell line (CGR8), is 2.6 Mb in size and consists of sequences derived from the human Y chromosome and mouse chromosomes ...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s004120100160
更新日期：2001-11-01 00:00:00
abstract：:A higher order organization of the centromeres in the form of clustering of these DNA loci has been observed in many organisms. While centromere clustering is biologically significant to achieve faithful chromosome segregation, the underlying molecular mechanism is yet to be fully understood. In budding yeast, a kinet...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s00412-019-00694-9
更新日期：2019-06-01 00:00:00
abstract：:The genomic DNA organisation patterns of four sauropsidian species, namely Python reticularis, Caiman crocodilus, Terrapene carolina triungius and Columba livia domestica were investigated by reassociation of short and long DNA fragments, by hyperchromicity measurements of reannealed fragments and by length estimation...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00292208
更新日期：1979-11-01 00:00:00
abstract：:Drosophila melanogaster was transformed with an 18 kb fragment of the C3 DNA puff of Rhynchosciara americana, including the C3-22 gene and the origins of replication that direct amplification. Different tissues and developmental stages of five independent transgenic lines were analyzed by quantitative Southern blot hy...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s00412-003-0254-4
更新日期：2003-10-01 00:00:00
abstract：:The sex chromosomes in Sauropsida (reptiles and birds) have evolved independently many times. They show astonishing diversity in morphology ranging from cryptic to highly differentiated sex chromosomes with male (XX/XY) and female heterogamety (ZZ/ZW). Comparing such diverse sex chromosome systems thus provides unpara...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s00412-015-0531-z
更新日期：2016-03-01 00:00:00
abstract：:The spatial distribution of parental genomes has attracted much interest because intranuclear chromosome distribution can modulate the transcriptome of cells and influence the efficacy of meiotic homologue pairing. Pairing of parental chromosomes is imperative to sexual reproduction as it translates into homologue seg...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s00412-014-0479-4
更新日期：2014-12-01 00:00:00
abstract：:A complete human metaphase chromosome has been reconstructed from a series of electron microscopical projections obtained by tilting the specimen stage at 3 degree intervals from -60 to +60 degrees. The reconstructed structure is about 3.0 microns long, 1.6 micron wide, and 0.8 micron thick. The mass distribution was ...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00293184
更新日期：1987-01-01 00:00:00
abstract：:It is reported that chromatin can be prepared from highly purified polytene nuclei from the salivary glands of third instar larvae of Drosophila hydei; such chromatin differs from that of diploid nuclei mainly by deficiencies in certain nonhistone chromosomal proteins. It is suggested that these proteins are important...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00319831
更新日期：1975-01-01 00:00:00
abstract：:BrdU-substituted Chinese hamster chromosomes were treated with a hog Na2HPO4 solution and stained with Giemsa to produce sister chromatid differential staining (SCD). The process of SCD was examined with the Nomarski differential interference microscope and the scanning electron microscope. After the Na2HPO4 treatment...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00285754
更新日期：1981-01-01 00:00:00
abstract：:Minute elements detected in Megaselia scalaris (Phoridae, Diptera) lack chromosome arms but carry centromeres and possess kinetochore microtubules in mitosis as well as in meiosis. These centromere-like elements (CLEs) were present in two geographically independent strains of the fly. This indicates that their origin ...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00357059
更新日期：1991-11-01 00:00:00
abstract：:We have studied the diameter of chromatin fibres embedded in epoxy resins for three different materials: mouse thymus, chicken erythrocytes and sea cucumber spermatozoa. We confirm that the diameter of chromatin fibres increases with linker length, both values being influenced by the protein composition of chromatin. ...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00293338
更新日期：1989-06-01 00:00:00
abstract：:Macronuclear DNA was isolated from purified macronuclei of Paramecium aurelia and the size distribution was determined with regard to growth phase and method of extraction. DNA molecules as long as 105 microns and as short as 0.2 microns were observed. It was concluded that the method of extraction affected the observ...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00329171
更新日期：1975-12-10 00:00:00
abstract：:Nucleosome assembly involves deposition of a heterotetramer of histones H3/H4 onto DNA followed by two heterodimers of histones H2A/H2B. Cycles of nucleosome assembly and disassembly are essential to cellular events such as replication, transcription, and DNA repair. After synthesis in the cytoplasm, histones are shut...
journal_title：Chromosoma
pub_type： 杂志文章,评审
doi：10.1007/s00412-006-0087-z
更新日期：2007-04-01 00:00:00
abstract：:We studied the karyotype of specimens of Callithrix emiliae (Callithricidae, Primates) from Rondonia, Brazil. Comparison with the karyotype of Callithrix jacchus showed that, even though these two species show many karyotypic similarities, they differ by a Robertsonian translocation, a paracentric inversion and large-...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF01726697
更新日期：1990-10-01 00:00:00
abstract：:The antigens in HeLa and Trichosia pubescens cells, recognized by sera from patients with rheumatic diseases containing anti-Ku antibodies, were compared by means of immunoprecipitation of labeled cell extracts. The autoantibodies present in the tested sera precipitate at least two polypeptides of approximately Mr = 7...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF01735325
更新日期：1990-04-01 00:00:00
abstract：:The Smc5/6 complex, along with cohesin and condensin, is a member of the structural maintenance of chromosome (SMC) family, large ring-like protein complexes that are essential for chromatin structure and function. Thanks to numerous studies of the mitotic cell cycle, Smc5/6 has been implicated to have roles in homolo...
journal_title：Chromosoma
pub_type： 杂志文章,评审
doi：10.1007/s00412-015-0518-9
更新日期：2016-03-01 00:00:00
abstract：:One of the subjects within the meiotic field that has been actively investigated in the recent years is the temporal and functional relationships between meiotic recombination, cohesin loading and synaptonemal complex (SC) assembly. Although the study of meiotic mutants has shed some light, many questions remain to be...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s00412-009-0204-x
更新日期：2009-06-01 00:00:00
abstract：:Compelling evidence has been obtained in favour of the idea that the nuclear surface of higher plant cells is a microtubule-nucleating and/or organizing site (MTOC), in the absence of defined centrosomes. How these plant MTOC proteins are redistributed and function during the progression of the cell cycle remains enti...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00417882
更新日期：1994-09-01 00:00:00
abstract：:Four different inversion heterozygotes of maize were examined for the occurrence of synaptic adjustment. Three substages of pachytene were identified in synaptonemal complex (SC) spreads using side-by-side comparisons of chromosome squashes with two-dimensional spreads of SCs. In SC spreads, inversion loop frequency d...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/BF00286917
更新日期：1988-01-01 00:00:00
abstract：:Chromosome segregation ensures the equal partitioning of chromosomes at mitosis. However, long chromosome arms may pose a problem for complete sister chromatid separation. In this paper we report on the analysis of cell division in primary cells from field vole Microtus agrestis, a species with 52 chromosomes includin...
journal_title：Chromosoma
pub_type： 杂志文章
doi：10.1007/s00412-006-0077-1
更新日期：2006-12-01 00:00:00
