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Abstract
Myocardial nuclei have been found to undergo a dramatic change in nuclear conformation during the contraction-relaxation cycle. This was demonstrated with electron micrographs of longitudinally and transversely oriented nuclei in contracted and relaxed fibers of rat myocardium. The contracted fibers had a mean sarcomere length of l.7µ ± 0.1µ (±1 SD), and extended fibers had a mean sarcomere length of 2.1µ ± 0.3µ. The amount of membrane wrinkling was quantified by comparing a straight-line distance of 6.64µ between two points on the nuclear membrane to the distance along the membrane (NML) between the same points. The degree of wrinkling was expressed as "redundancy" which is [(NML - 6.64)/6.64] x 100. Longitudinal sections showed a marked difference in mean length and width in the two populations of nuclei, with an axial ratio of 2.2 in the contracted, and 4.8 in the extended fibers. The most obvious difference between the two populations, however, was the nuclear membrane redundancy, which was 2.1% and 27.0% for the extended and contracted fibers, respectively. Although a difference in nuclear membrane redundancy was clear in longitudinal sections, it was not apparent in transverse sections. It is concluded that during systole myocardial nuclei become longitudinally compressed with folding of the membrane perpendicular to the long axis. The correlation of the change in sarcomere length with the change in nuclear length and membrane redundancy suggests a coupling of the nuclear membrane to some sarcomere segment.
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152
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Bloom S. Pulmonary edema following a grand mal epileptic seizure. THE AMERICAN REVIEW OF RESPIRATORY DISEASE 1968; 97:292-4. [PMID: 4966164 DOI: 10.1164/arrd.1968.97.2.292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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153
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Ison JR, Bloom S. Note on abortive jumping in the Lashley jumping stand. Psychol Rep 1967; 21:708. [PMID: 6079629 DOI: 10.2466/pr0.1967.21.3.708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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154
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Bloom S, Todaro GJ, Green H. RNA synthesis during preparation for growth in a resting population of mammalian cells. Biochem Biophys Res Commun 1966; 24:412-7. [PMID: 5967104 DOI: 10.1016/0006-291x(66)90175-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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155
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Bloom S. Case report: tracheostomy in status asthmaticus. ANNALS OF ALLERGY 1965; 23:538-42. [PMID: 5848199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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156
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Bloom S, Jacobson N, Allen R, McGilliard L, Homeyer P. Effects of Various Hay: Concentrate Ratios on Nutrient Utilization and Production Responses of Dairy Cows. II. Observations on Ration Digestibility and on the Excretion Pattern of Chromic Oxide. J Dairy Sci 1957. [DOI: 10.3168/jds.s0022-0302(57)94470-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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157
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Bloom S, Jacobson N, McGilliard L, Homeyer P, Heady E. Effects of Various Hay-Concentrate Ratios on Nutrient Utilization and Production Responses of Dairy Cows. I. Relationships among Feeding Level, Predicted Producing Ability, and Milk Production. J Dairy Sci 1957. [DOI: 10.3168/jds.s0022-0302(57)94443-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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158
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Bloom S, Knodt C. The Value of Aureomycin and Vitamin B12 in Milk Replacement Formulas for Dairy Calves. J Dairy Sci 1952. [DOI: 10.3168/jds.s0022-0302(52)93775-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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161
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162
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Bloom S. Diphtheria in South Wales. West J Med 1935. [DOI: 10.1136/bmj.1.3863.131-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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