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1.
RegB is involved in the control of the phage T4 life cycle. It inactivates the phage early mRNAs when their translation is
no more required. We determined its structure and identified residues involved in substrate binding. For this, all backbone
and 90% of side-chain resonance frequencies were assigned. 相似文献
2.
Catherine Bonaïti-Pellié Françoise Clerget-Darpoux Marie-Claude Babron 《Human genetics》1990,86(2):203-208
Summary Although the retinoblastoma gene has been isolated and sequenced, the difference in penetrance and expressivity among families has not yet been fully explained. Balanced chromosomal insertion involving the 13q14 regions has been shown to account for some families with several unaffected carriers. Since there could be cases with karyotypically undetectable insertions, we tested whether this mechanism was general enough to explain the whole difference in expressivity among families. Using 166 pedigrees, reported in nine series available in the literature (including our own), we conclude that balanced insertion cannot entirely explain the familial data, even if we allow for a reduced viability of unbalanced gametes. Other mechanisms are proposed and discussed in this paper. 相似文献
3.
A Lacoursière-Roussel DG Bock ME Cristescu F Guichard P Girard P Legendre CW McKindsey 《Molecular ecology》2012,21(17):4227-4241
The relative importance of multiple vectors to the initial establishment, spread and population dynamics of invasive species remains poorly understood. This study used molecular methods to clarify the roles of commercial shipping and recreational boating in the invasion by the cosmopolitan tunicate, Botryllus schlosseri. We evaluated (i) single vs. multiple introduction scenarios, (ii) the relative importance of shipping and boating to primary introductions, (iii) the interaction between these vectors for spread (i.e. the presence of a shipping-boating network) and (iv) the role of boating in determining population similarity. Tunicates were sampled from 26 populations along the Nova Scotia, Canada, coast that were exposed to either shipping (i.e. ports) or boating (i.e. marinas) activities. A total of 874 individuals (c. 30 per population) from five ports and 21 marinas was collected and analysed using both mitochondrial cytochrome c oxidase subunit I gene (COI) and 10 nuclear microsatellite markers. The geographical location of multiple hotspot populations indicates that multiple invasions have occurred in Nova Scotia. A loss of genetic diversity from port to marina populations suggests a stronger influence of ships than recreational boats on primary coastal introductions. Population genetic similarity analysis reveals a dependence of marina populations on those that had been previously established in ports. Empirical data on marina connectivity because of boating better explains patterns in population similarities than does natural spread. We conclude that frequent primary introductions arise by ships and that secondary spread occurs gradually thereafter around individual ports, facilitated by recreational boating. 相似文献
4.
Structure and growth pattern of the bizarre hemispheric prominence on the rostrum of the fossil beaked whale Globicetus hiberus (Mammalia,Cetacea, Ziphiidae)
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Maïtena Dumont Vivian de Buffrénil Ismael Miján Olivier Lambert 《Journal of morphology》2016,277(10):1292-1308
The rostrum of most ziphiids (beaked whales) displays bizarre swollen regions, accompanied with extreme hypermineralisation and an alteration of the collagenous mesh of the bone. The functional significance of this specialization remains obscure. With the voluminous and dense hemispheric excrescence protruding from the premaxillae, the recently described fossil ziphiid Globicetus hiberus is the most spectacular case. This study describes the histological structure and interprets the growth pattern of this unique feature. Histologically, the prominence in Globicetus is made up of an atypical fibro‐lamellar complex displaying an irregular laminar organization and extreme compactness (osteosclerosis). Its development is suggested to have resulted from a protraction of periosteal accretion over the premaxillae, long after the end of somatic growth. Complex shifts in the geometry of this tissue are likely to have occurred during its accretion and no indication of Haversian remodeling could be found. X‐ray diffraction and Raman spectroscopy indicate that the bone matrix in the premaxillary prominence of Globicetus closely resembles that of the rostrum of the extant beaked whale Mesoplodon densirostris: apatite crystals are of common size and strongly oriented, but the collagenous meshwork within bone matrix seems to be extremely sparse. These morphological and structural data are discussed in the light of functional interpretations proposed for the highly unusual and diverse ziphiid rostrum. J. Morphol. 277:1292–1308, 2016. © 2016 Wiley Periodicals, Inc. 相似文献
5.
6.
High level of divergence of male-reproductive-tract proteins, between Drosophila melanogaster and its sibling species, D. simulans 总被引:1,自引:0,他引:1
We compared male-reproductive-tract polypeptides of Drosophila melanogaster
and D. simulans by using two-dimensional gel electrophoresis. Approximately
64% of male-reproductive-tract polypeptides were identical between two
randomly chosen isofemale lines from these two species, compared with 83%
identity for third-instar imaginal wing-disc polypeptides. Qualitatively
similar differences were found between reproductive tracts and imaginal
discs when D. sechellia was compared with D. melanogaster and with D.
simulans. When genic polymorphism was taken into account, approximately 10%
of male- reproductive-tract polypeptides were apparently fixed for
different alleles between D. melanogaster and D. simulans; this proportion
is the same as that found for soluble enzymes by one-dimensional gel
electrophoresis. Strikingly, approximately 20% of male-reproductive- tract
polypeptides of either D. melanogaster or D. simulans had no detectable
homologue in the other species. We propose that proteins of the Drosophila
male reproductive tract may have diverged more extensively between species
than have other types of proteins and that much of this divergence may
involve large changes in levels of polypeptide expression.
相似文献
7.
Adriaan P. de Bruïne Winand N. M. Dinjens Margriet M. J. Pijls Edith P. M. v. d. Linden Mat J. M. Rousch Peter T. Moerkerk Antony F. P. M. de Goeij Fred T. Bosnian 《Virchows Archiv. B, Cell pathology including molecular pathology》1992,62(1):311-320
In colonic neoplasms, endocrine differentiation is encountered not only in carcinoid tumors but also in adenocarcinomas, where
endocrine cells may represent a distinct line of differentiation in the tumor. The significance of endocrine differentiation
in colorectal cancer is not well established, partly because of the paucity of tumor cell lines which can serve as a model
for studying endocrine differentiation. In this report we describe the properties of NCI-H716 cells, a cell line derived from
a poorly differentiated adenocarcinoma of the caecum, under various in vitro conditions and as xenografts in athymic mice.
Phenotypical properties were immunohistochemically assessed using a panel of differentiation related antibodies, and also
by Northern blot analysis and by electron microscopy. Receptors for biogenic amines and peptide hormones were analyzed by
ligand binding assay. These studies show that:
相似文献
1. | NCI-H716 cells can be undifferentiated, or show endocrine, mucin-producing or “amphicrine” properties. |
2. | Endocrine differentiation of NCI-H716 cells preferentially occurs in xenografts in athymic mice, which suggests that mesenchymal elements induce endocrine differentiation. |
3. | NCI-H716 cells express large amounts of high affinity receptors for gastrin, serotonin and somatostatin and these substances can regulate growth. Thus, NCI-H716 cells form a suitable model for the study of endocrine differentiation in intestinal epithelium and of auto- or paracrine growth regulation in intestinal neoplasia. |
8.
More than 750 plants were regenerated from protoplasts isolated from microspore callus-derived cell suspensions of the Mediterranean japonica rice Miara, using a nurse-feeder technique and N6-based culture medium. The mean plating efficiency and the mean regeneration ability of the protocalluses were 0.5% and 49% respectively. Flow cytometric evaluation of the DNA contents of 7 month old-cell and protoplast suspensions showed that they were still haploid. Contrastingly, the DNA contents of leaf cell nuclei of the regenerated protoclones ranged from 1C to 5C including 60% 2C plants. This was consistent with the morphological type and the fertility of the mature plants. These results and the absence of chimeric plants suggest that polyploidization occurred during the early phase of protoplast culture.Abbreviations BAP
6-benzylamino purine
- 2,4-D
2,4-dichlorophenoxyacetic acid
- FDA
fluorescein diacetate
- GA3
gibberellic acid
- NAA
-naphthaleneacetic acid
- PAS
periodic acid Schiff
- PCM
protoplast culture medium
- PCV
packed cell volume 相似文献
9.
Expression of a Rhizobium phaseoli Sym plasmid in R. trifolii and Agrobacterium tumefaciens: incompatibility with a R. trifolii Sym plasmid 总被引:5,自引:0,他引:5
P.J.J. Hooykaas H. den Dulk-Ras A.J.G. Regensburg-Tuïnk A.A.N. van Brussel R.A. Schilperoort 《Plasmid》1985,14(1):47-52
Identification of the Sym plasmid in Rhizobium phaseoli strain RCC3622 is described. Introduction of this plasmid into R. trifolii or Agrobacterium tumefaciens strains resulted in bacteria capable of forming characteristic spherical root nodules on beans. This Sym plasmid, designated pSym9, was characterized as 275 MDa and nonconjugative. pSym9 was incompatible with the R. trifolii Sym plasmid pSym5, and carries genes determining a melanin-like black pigment. A second plasmid of 135 MDa, pRph3622a, was also transferred from R. phaseoli to R. trifolii and A. tumefaciens. Transconjugants carrying this plasmid did not form root nodules on beans. In contrast to other Rhizobium plasmids, pRph3622a was unstable in A. tumefaciens. 相似文献
10.