Endocardial Fibroelastosis in Growth-Discordant Monozygotic Twins

1998 ◽  
Vol 1 (6) ◽  
pp. 522-527 ◽  
Author(s):  
E.J. Lazda
Keyword(s):  
Multiple Pregnancy ◽  
Vascular Anatomy ◽  
Monozygotic Twins ◽  
Endocardial Fibroelastosis ◽  
Relationship Of ◽  
The Relationship

Two cases of fetal endocardial fibroelastosis are reported in the larger of growth-discordant monozygotic twins. The growth discordance in these two cases is regarded as a manifestation of twin-twin transfusion syndrome, but other causes are considered and the difficulties posed by the observed placental vascular anatomy are discussed. The literature on endocardial fibroelastosis in multiple pregnancy is briefly reviewed, and the relationship of endocardial fibroelastosis to the cardiovascular compromise seen in twin-twin transfusion syndrome is considered.

Studies in the Alismataceae. III. Floral anatomy of Ranalisma humile

1973 ◽  
Vol 51 (5) ◽  
pp. 891-897 ◽  
Author(s):  
W. A. Charlton ◽  
A. Ahmed
Keyword(s):  
Vascular System ◽  
Floral Anatomy ◽  
Vascular Anatomy ◽  
Vascular Supply ◽  
Variable Amount ◽  
Peripheral Vascular ◽  
Two Systems ◽  
A Minor ◽  
Relationship Of ◽  
The Relationship

The flower of Ranalisma humile is comparable in morphology to those of other alismads. The vascular anatomy is noteworthy. Flowers of R. humile are provided with a major (central) vascular system supplying androecial and gynoecial vasculature and a variable amount of the sepal and petal vasculature, and a minor (peripheral) system which supplies the rest of the perianth vasculature. There is very little anastomosis between the two systems. It is suggested that the variability of perianth vascular supply reflects variability in timing of differentiation events. The occurrence of an almost independent peripheral vascular system is probably of significance in a consideration of the relationship of Ranalisma humile to other alismads.

Lifetime prevalence of mood and anxiety disorders in twin pairs discordant for schizophrenia

Twin Research ◽  
2000 ◽  
Vol 3 (1) ◽  
pp. 28-32 ◽  
Author(s):  
Michael J Lyons ◽  
Jonathan Huppert ◽  
Rosemary Toomey ◽  
Rebecca Harley ◽  
Jack Goldberg ◽  
...  
Keyword(s):  
Mental Disorders ◽  
Anxiety Disorders ◽  
Genetic Factors ◽  
Statistical Significance ◽  
Monozygotic Twins ◽  
Twin Registry ◽  
Mood And Anxiety Disorders ◽  
Vietnam Era ◽  
Relationship Of ◽  
The Relationship

AbstractThere have been long questions about the relationship of schizophrenia to other mental disorders. Lifetime DSM-III-R diagnoses of mood and anxiety disorders in twins with clinically diagnosed schizophrenia (n = 24) and their non-affected co-twins (n = 24) were compared with twins from pairs without schizophrenia (n = 3327) using a sample from the Vietnam Era Twin Registry. Schizophrenic probands had significantly elevated rates of all included disorders (bipolar disorder, major depression, dysthymia, generalized anxiety disorder, panic disorder, and PTSD) compared with controls (P < 0.01). The odd ratios comparing co-twins of schizophrenic probands with controls was greater than three for every disorder, but did not attain statistical significance. A similar pattern was observed when analyses were restricted to only monozygotic twins (n = 12). Consistent with other studies, schizophrenics appeared to have higher rates of a range of mental disorders. Our results suggest that schizophrenia per se represents a risk factor for other psychiatric disorders, but the absence of significantly elevated risk among non-schizophrenic co-twins suggested that family environmental and/or genetic factors that contribute to risk of schizophrenia do not increase the risk of mood and anxiety disorders to the same extent that the risk of these other disorders is increased by the presence of schizophrenia. Twin Research (2000) 3, 28–32.

The Relationship of Tension-Free Vaginal Tape Insertion and the Vascular Anatomy

2003 ◽  
Vol 101 (5, Part 1) ◽  
pp. 933-936
Author(s):  
Tristi W. Muir ◽  
Paul K. Tulikangas ◽  
Marie Fidela Paraiso ◽  
Mark D. Walters
Keyword(s):  
Vascular Anatomy ◽  
Tension Free ◽  
Tension Free Vaginal Tape ◽  
Relationship Of ◽  
The Relationship

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Studies on Leukemogenic and Sarcomagenic Viruses

1970 ◽  
Vol 28 ◽  
pp. 156-157
Author(s):  
Leon Dmochowski
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Morphological Properties ◽  
Mode Of Development ◽  
Relationship Of ◽  
The Relationship

Electron microscopy has proved to be an invaluable discipline in studies on the relationship of viruses to the origin of leukemia, sarcoma, and other types of tumors in animals and man. The successful cell-free transmission of leukemia and sarcoma in mice, rats, hamsters, and cats, interpreted as due to a virus or viruses, was proved to be due to a virus on the basis of electron microscope studies. These studies demonstrated that all the types of neoplasia in animals of the species examined are produced by a virus of certain characteristic morphological properties similar, if not identical, in the mode of development in all types of neoplasia in animals, as shown in Fig. 1.

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