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  • 11
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 918-927 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 12
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract HeLa metaphase chromosomes were exammed by means of “in lens” field emission scanning electron microscopy, which permits high resolution detection of uncoated biological samples. By using uncoated chromosomes as a model for comparison we report evidence of how traditional scanning electron microscopy techniques such as metal coating and conductive methods can generate errors in chromosome structure evaluation, since both give rise to morphological artifacts. By comparing the morphology of uncoated chromosomes obtained by two different isolation procedures, such as that utilized in standard cytogenetics and the polyamine method, we have drawn the following conclusions: (a) the standard cytogenetic method gives rise to a chromosome structure consisting of a flattened network of 10 nm fibers, in which higher order chromatin organization is absent. (b) Chromosomes obtained by the polyamine method show both three-dimensional profile and higher level folding of chromatin fibers, supporting the loop chromosome organization previously suggested by scanning electron microscopy observation of hexylene glycol isolated chromosomes.
    Type of Medium: Electronic Resource
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  • 13
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. HeLa metaphase chromosomes were examined by means of “in lens” field emission scanning electron microscopy, which permits high resolution detection of uncoated biological samples. By using uncoated chromosomes as a model for comparison we report evidence of how traditional scanning electron microscopy techniques such as metal coating and conductive methods can generate errors in chromosome structure evaluation, since both give rise to morphological artifacts. By comparing the morphology of uncoated chromosomes obtained by two different isolation procedures, such as that utilized in standard cytogenetics and the polyamine method, we have drawn the following conclusions: (a) the standard cytogenetic method gives rise to a chromosome structure consisting of a flattened network of 10 nm fibers, in which higher order chromatin organization is absent. (b) Chromosomes obtained by the polyamine method show both three-dimensional profile and higher level folding of chromatin fibers, supporting the loop chromosome organization previously suggested by scanning electron microscopy observation of hexylene glycol isolated chromosomes.
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A number of techniques are currently employed for the fractionation of heterogeneous cell populations or for the separation of cells in different phases of their cycle. With the development of osmotically inert colloidal silica particles media, density gradient centrifugation became an established method for the separation and purification of cells and subcellular particles. We have applied this technique to the separation of cycling from resting Friend erythroleukemia cells, to obtain purified populations for further biological assays. The flow cytometric analysis of DNA content of the different fractions obtained by the gradient and stained with Propidium lodide (PI), showed the S compartment highly concentrated in the 1.073/77g/ml interface, while the upper levels of the gradient were highly enriched of cells in G1 phase. Moreover, the dual parameter analysis of DNA content by means of Bromodeoxyuridine (BrdUrd) incorporation and PI staining, showed that part of the cells in the 1.067/73 fraction represented the early S phase even if their DNA level, measured on the basis of PI fluorescence was within the diploid cell cluster. This method seems to be suitable to obtain pure cell fractions even when dealing with numerically large populations.
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In order to investigate at ultrastructural level the mechanism of DNA synthesis progression during the different moments of S-phase a bromodeoxyuridine-anti bromodeoxyuridine (BrdU-anti BrdU) method has been applied to synchronized 3T3 fibroblasts. After 30 min BrdU incorporation, five different labelling patterns can be identified and should be related to early, middle and late S-phase. These patterns are represented mainly by diffuse labelling localized in different nuclear domains and by quite rare cases in which the labelling is limited to isolated clusters of gold particles. After a 5-min pulse with BrdU it is possible to observe isolated clusters of gold particles at each moment of S-phase, which, however, exhibit the same distribution of the five principal labelling patterns observed after 30 min incorporation. In both cases labelling can be detected in the interchromatin regions during early S-phase, at the boundary between interchromatin and heterochromatin during middle S-phase and in the heterochromatin domains during late S-phase. Considering their size, the isolated spots of labelling could be interpreted as single replication units which are subsequently activated throughout the different moments of the S-phase.
    Type of Medium: Electronic Resource
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  • 16
    ISSN: 1435-2451
    Keywords: Key words External pancreatic fistulas ; Octreotide ; Pancreatic cancer ; Pancreatic surgery ; Pancreatitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Introduction: Octreotide was studied in the treatment of pure external pancreatic fistulas. Methods: Eighteen cases (12 males, 6 females) were prospectively observed. Six patients (four after radical surgery for periampullary cancer, one endocrine tumor enucleation and one pancreojejunostomy in chronic pancreatitis) were treated as outpatients with octreotide alone because of low basal fistula output (mean±SD: 96.6±27.4 cc/24 h). Twelve (five radical surgery for cancer, five surgery for severe pancreatitis, one enucleation and one pancreojejunostomy) were treated as inpatients with octreotide plus total parenteral nutrition because of the high output (mean±SD: 448.4±248.2 cc/24 h). Results: Ten of the 12 high-output fistulas healed in 27.8±27.7 days, whereas all low-output fistulas healed in 12.1±6.6 days. Conclusion: Octreotide appears useful in the treatment of external pancreatic fistulas. For optimal results to be achieved, there must be no local infection and no mechanical or anatomical obstacles to the free flow of juice.
    Type of Medium: Electronic Resource
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  • 17
    ISSN: 1436-0691
    Keywords: pancreatic cancer ; small ; diagnosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The size of a pancreatic ductal carcinoma is one of the factors that has the greatest impact on the prognosis of the disease. Precise measurement of tumor size in such cases can obviously be achieved only by the pathologist, but, as a result of the increasingly widespread use and refinement of imaging procedures, a fairly accurate preoperative estimate now appears feasible for identifying those lesions which measure ≤2 m in size and which are conventionally defined as “small tumors.” At tomography, 15/72 patients (20.8%) with cancer of the head of the pancreas observed in our department over the period 1991 to 1994 were prospectively identified as having tumors measuring ≤2 cm. Histology subsequently confirmed that the growths measured 2 cm or less in size in only 4 of these patients, thus revealing that the imaging technique tended to underestimate the tumor diameters. If we exclude the mean time elapsing from onset of symptoms to diagnosis, which was found to be significantly shorter in small than in non-small tumors (6.3 vs 34.2 days,P 〈0.01), no statistically significant differences were observed in any of the clinical and blood chemistry data evaluated (including CA 19-9 values) in patients with small vs non-small tumors who underwent radical resection. Small tumors of the pancreas are still rare and their diagnosis is often incidental (2/4 in this case series) and can only be confirmed by pathology findings. The radiological detection of a small tumor, however, is strongly suggestive of resectability (more than 70% in this series). This should prompt the surgeon to adopt an aggressive approach, even though the topographical location and biological nature of tumors measuring ≤2 cm are known to be capable of substantially undermining their potentially better prognosis.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 227 (1991), S. 60-64 
    ISSN: 1617-4623
    Keywords: Translational initiation ; AUU initiation triplet ; Gene regulation ; Transcriptional signals ; Expression of thermophilic proteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary By Northern blot and primer extension analyses it was shown that inBacillus stearothermophilus the genesinfC, rpmI andrplT constitute a single transcriptional unit; the promoter and the transcriptional start-point used in vivo were identified and the half-life of the transcript (1.2 min) was determined. No indication of multiple initiation sites nor of differential stability of different regions of the transcript was found. The results suggest thatEscherichia coli andB. stearothermophilus have a different pattern of transcription around theinfC gene cluster and that differential translational efficiency within theinfC-rpmI-rplT transcriptional unit accounts for the different levels of 1173, L35 and L20 expression. The rare AUU initiation codon is the only strictly conserved element of the several peculiar transcriptional and translational features found inE. coli infC. Upon changing this codon to AUG, we found a ca. 30-fold increased expression ofB. stearothermophilus infC, which is similar to that previously found withE. coli infC (i.e. 40-fold), and provided evidence that regulation ofinfC expression through its rare AUU initiation codon might be a general phenomenon in bacteria.
    Type of Medium: Electronic Resource
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  • 19
    ISSN: 0749-503X
    Keywords: Chromosome III ; Ty insertion ; gene disruption ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: We report the 9210 bp sequence from a segment of yeat chromosome III cloned from strain AB972 in λPM3270. Analysis of this sequence and its comparison with the one derived from the corresponding segment of strain XJ24-24A revealed that the AB972 region contains a duplication of about 2 kb and a Ty element, which are not found in XJ24-24A and cause a quite significant rearrangement of the whole region. We performed analysis of YCR28, the largest open reading frame we found in both AB972 and XJ24-24A. YCR28 encodes a putative protein of 512 amino acids with some similarities to yeast allontoate permease. Its disruption does not cause any detectable phenotype on rich medium or on allantoate medium, while we observed a strain-dependent effect on senstivity to amino acid balance and to 3-aminotriazole, when cells were grown in synthetic medium.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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