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  • Life and Medical Sciences  (391)
  • Humans  (339)
  • 1980-1984  (504)
  • 1975-1979  (226)
  • 1
    Electronic Resource
    Electronic Resource
    Preparation of biological tissue sections for correlative ion, electron, and light microscopy (1984)
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 1 (1984), S. 299-309 
    Details
    ISSN: 0741-0581
    Keywords: Electron microscopy ; Ion microscopy ; Correlative microscopy ; Electron probe microanalysis ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: In order to correctly interpret the chemical images obtained using ion microscopy (IM), it is useful to correlate them with the information provided by conventional light microscopy (LM), secondary electron imaging (SEI), backscattered electron imaging (BEI), and electron probe microanalysis (EPMA). Accordingly, we have devised a technique of specimen preparation which allows for the application of several different microanalytical techniques to a single histologic section mounted on the same substrate. Sections are cut onto polyester plastic coverslips (devoid of peaks for any element with atomic number 〉 9 using EPMA) and studied by LM. After a light rotary coating with carbon (to prevent charging), the section can then be examined by SEI, BEI, and EPMA. Specific areas can be marked for IM study either with an objective-mounted pin tissue microlocater, or by placing small pieces of metal foil, cut in specific geometric shapes, over features of interest. After sputter-coating the sample with platinum, metal-free shadows are visible using a low-power reflected light microscope available on a typical IM sample chamber as a guide for ion beam placement. The conductive coatings also minimize specimen charging during IM. Post-IM light microscopy, SEI, and BEI are used to confirm the location of specific areas probed in the IM experiments and to provide information on differential ion-sputtering artifacts and tissue contaminants. This new correlative technique should permit better understanding of the images obtained with these diverse instruments.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1060010309
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  • 2
    Electronic Resource
    Electronic Resource
    Polyadenylate-deficient analogues of poly(A)-containing mRNA sequences in cultured AKR mouse embryo cells (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 103 (1980), S. 417-428 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Five to six percent (by mass) of AKR-2B mouse embryo cell polysomal RNA consists of messenger RNA sequences which may exist in polyadenylated form. In the steady state, however, only 30-40% of these molecules are retained by extensive passage over oligo(dT)-cellulose, the remainder being present in the form of poly(A)-deficient analogues. Within experimental limits, these poly(A)-deficient analogues contain representatives of all poly(A)-containing mRNA sequences in these cells. An analysis of the kinetics of hybridization of cDNA probes enriched for either abundant or rare poly(A)-containing mRNA sequences suggests that the frequency distributions of poly(A)-containing and poly(A)-deficient analogues are dissimilar, and that a relationship exists between the intracellular frequency of a given mRNA sequence and the number of poly(A)-deficient analogues of that sequence. High frequency sequences appear to be enriched in the poly(A)-containing fraction, while low frequency sequences are predominately associated with the poly(A)-deficient fraction, thus, poly(A) may play a role in the regulation of mRNA frequency in the cytoplasm.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041030307
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  • 3
    Electronic Resource
    Electronic Resource
    Development of calcium and secretory responses in the human promyelocytic leukemia cell line HL60 (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 119 (1984), S. 241-246 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: We have begun to characterize the development of the excitation - response coupling sequence in the human promyelocytic leukemia cell line HL60. Using the recently developed fluorescent calcium probe quin-2, it was found that DMSO induced myeloid differentiation of the HL60 cells is accompanied by the development of a calcium response to the addition of the chemotactic factors fMet-Leu-Phe and leukotriene B4. The characteristics (time course, concentration dependence, stereospecificity, and metabolic dependence) of the calcium response are extremely similar to those previously described in human neutrophils. These results imply that functional receptors for leukotriene B4 appear in HL60 cells upon the induction of differentiation and also lend strong support to the use of these HL60 cells as a model of human myeloid differentiation. We have also characterized the emergence of a secretory response to fMet-Leu-Phe and leukotriene B4 in cytochalasin B treated HL60 cells. In addition, it is found that differentiation was required for the calcium ionophore A23187 to express its secretory activity toward the HL60 cells. This last set of results implies that differentiation is accompanied by the coordinated appearance of surface receptors and cytoplasmic factors required for the expression of cellular responsiveness.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041190215
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  • 4
    Electronic Resource
    Electronic Resource
    Cellular regulatory role of leukotriene B4: Its effects on cation homeostasis in rabbit neutrophils (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 108 (1981), S. 401-408 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: We have found that exogenous leukotriene B4 modifies calcium homeostasis in rabbit neutrophils in a manner essentially analogous to that of the chemotactic peptide f-Met-Leu-Phe. Leukotriene B4 causes a rapid and dose-dependent increase in membrane permeability to calcium and a release of calcium from previously unexchangeable intracellular pool(s). The net result of these changes is to transiently elevate the intracellular level of exchangeable calcium. A stereoisomer of leukotriene B4 with greatly reduced secretory activity toward neutrophils (5S, 12S-di HETE) is essentially without effect on the rate of 45Ca uptake at concentrations equal to those that produce near maximal enhancement by leukotriene B4. Leukotriene B4, in addition to its effects on calcium metablolism, also increases the rate of 22Na influx into rabbit neutrophils. The relationships between the action of leukotriene B4 on calcium homeostasis and the neutrophil-directed activities of arachidonic acid and its lipoxygenase metabolites are discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041080314
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanism of action of leukotriene B4: Intracellular calcium redistribution in rabbit neutrophils (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 118 (1984), S. 13-18 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The possible involvement of membrane-bound calcium in the mechanism of action of leukotriene B4 was examined using the fluorescent chelate probe, chlortetracycline. Leukotriene B4 was found to cause a rapid release of membrane-bound calcium at physiologically relevant concentrations. This effect of leukotriene B4 is stereospecific and its magnitude is decreased upon the transformation of leukotriene B4 into its ω-hydroxy and ω-carboxy metabolites. The pool of calcium affected by leukotriene B4 appears to be the same as that released by other chemotactic factors such as formyl-methionyl-leucyl-phenylalanine (f-Met-Leu-Phe). Similarly, preincubation with f-Met-Leu-Phe results in a decreased responsiveness of the cells to the addition of leukotriene B4. These results extend further the analogy between the mechanism of action of peptidic and lipid chemotactic factors, and emphasize the central role of the intracellular redistribution of calcium, as inferred and monitored by chlortetracycline fluorescence and steady-state isotopic flux studies, in neutrophil activation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041180104
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of progesterone and estradiol on gonadotropin - induced oocyte maturation in isolated ovarian follicles from mice (1980)
    New York, NY : Wiley-Blackwell
    Gamete Research 3 (1980), S. 59-66 
    Details
    ISSN: 0148-7280
    Keywords: mouse follicles in vitro ; progesterone ; estradiol ; gonadotropin ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Ovaries from pubertal mice were dissected into fragments containing 1-4 antral follicles, which were cultured on the surface of a chemistry defined medium. After 17-20 hrs oocytes were released from the cultured follicles and their meiotic status recorded. In the presence or absence of exogenous gonadotropins oocytes in these cultures behaved meiotically as expected if they had been studied in the intact animal. Media containing 100 μM of progesterone for the duration of the culture period caused atresia of the oocytes, and although the addition of gonadotropins reduced this necrosis they did not induce the resumption of meiosis. The meiotic stimulating effect of gonadotropins was also inhibited if progesterone was present in the culture media for the first 3 hours only. Estradiol (100 μM) similarly inhibited the meiotic inducing action of gonadotropins when left in the medium for the duration of culture, but had no effect when administrated for a shorter period. The results from this model system, would indicate that the meiotic-initiating action of gonadotropins can be modulated by exposure to progesterone and estradiol.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120030107
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  • 7
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    Visual phenomena induced by relativistic carbon ions with and without Cerenkov radiation (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-07-28
    Description: Exposing the human eye to individual carbon ions (6C+) moving at relativistic speeds results in visual phenomena that include point flashes, streaks, and larger diffuse flashes. The diffuse flashes have previously been observed by astronauts in space but not in laboratory experiments with particles of high atomic number and energy. They are observed only when the nucleus moves fast enough to generate Cerenkov radiation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McNulty, P J -- Pease, V P -- Bond, V P -- New York, N.Y. -- Science. 1978 Jul 28;201(4353):341-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/663660" target="_blank"〉PubMed〈/a〉
    Keywords: *Carbon ; Cations, Monovalent ; Humans ; Motion ; *Space Flight ; Vision, Ocular/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    Cancer incidence in the Love Canal area (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-06-19
    Description: Data from the New York Cancer Registry show no evidence for higher cancer rates associated with residence near the Love Canal toxic waste burial site in comparison with the entire state outside of New York City. Rates of liver cancer, lymphoma, and leukemia, which were selected for special attention, were not consistently elevated. Among the other cancers studied, a higher rate was noted only for respiratory cancer, but it was not consistent across age groups and appeared to be related to a high rate for the entire city of Niagara Falls. There was no evidence that the lung cancer rate was associated with the toxic wastes buried at the dump site.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Janerich, D T -- Burnett, W S -- Feck, G -- Hoff, M -- Nasca, P -- Polednak, A P -- Greenwald, P -- Vianna, N -- New York, N.Y. -- Science. 1981 Jun 19;212(4501):1404-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7233229" target="_blank"〉PubMed〈/a〉
    Keywords: Carcinogens ; Female ; Humans ; Leukemia/epidemiology ; Liver Neoplasms/epidemiology ; Lymphoma/epidemiology ; Male ; Neoplasms/*epidemiology ; New York ; Registries ; Soil Pollutants/*adverse effects
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Bimodal distribution of dopamine receptor densities in brains of schizophrenics (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-17
    Description: The dopamine hypothesis of schizophrenia was examined by measuring the density of dopamine receptors in the postmortem brains of 81 control subjects and 59 schizophrenics from four different countries. The densities of dopamine receptors in the tissues from the schizophrenic patients had a bimodal distribution in the caudate nucleus, putamen, and nucleus accumbens. One mode occurred 25 percent above the control density, and a second mode occurred at a density 2.3 times that of the control density for all three regions. Although almost all the patients had been medicated with neuroleptics, the two modes had the same dissociation constant for the labeled ligand used, suggesting that the neuroleptic doses were similar for the two populations of schizophrenics. The results thus provide direct evidence for two distinct categories of schizophrenia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Seeman, P -- Ulpian, C -- Bergeron, C -- Riederer, P -- Jellinger, K -- Gabriel, E -- Reynolds, G P -- Tourtellotte, W W -- New York, N.Y. -- Science. 1984 Aug 17;225(4663):728-31.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6147018" target="_blank"〉PubMed〈/a〉
    Keywords: Antipsychotic Agents/pharmacology ; *Brain Chemistry/drug effects ; Caudate Nucleus/analysis ; Dopamine/physiology ; Humans ; Nucleus Accumbens/analysis ; Putamen/analysis ; Receptors, Dopamine/*analysis/drug effects ; Schizophrenia/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Psychological stress induces sodium and fluid retention in men at high risk for hypertension (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-04-22
    Description: Exposure to competitive mental tasks significantly reduced the urinary sodium and fluid excreted by young men with one or two hypertensive parents or with borderline hypertension. In this high-risk group, the degree of retention was directly related to the magnitude of heart rate increase during stress, suggesting common mediation by way of the sympathetic nervous system. Thus, psychological stress appears to induce changes in renal excretory functions that may play a critical role in long-term blood pressure regulation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Light, K C -- Koepke, J P -- Obrist, P A -- Willis, P W 4th -- HL-01096/HL/NHLBI NIH HHS/ -- HL-18976/HL/NHLBI NIH HHS/ -- HL-23718/HL/NHLBI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1983 Apr 22;220(4595):429-31.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6836285" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Blood Pressure ; Heart Rate ; Humans ; Hypertension/etiology/*physiopathology ; Kidney/physiopathology ; Male ; Risk ; Sodium/*metabolism ; Stress, Psychological/metabolism/*physiopathology ; *Water-Electrolyte Balance
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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