TY - JOUR TI - On the sperm transport through vas deferens: Review of hypotheses and suggestions for a quantitative model AU - Batra, S. T2 - Fertility and Sterility AB - Study of the mechanism of sperm transport through the vas deferens stems from the need to develop acceptable male contraceptive devices or procedures. The object of this paper is to review all the hypothese related to the innervation structure and function of the vas. Also considered are the experimental data and theoretical analyses necessary for understanding seminal fluid transport through the vas. Similarities in structure and function of the ureter are noted. Histologically the vas deferens lumen is bounded by a 3-layer musular wall. The inner and outer layers of smooth muscle wall are arranged longitudinally. The middle layer is circumferential. The vas deferns epididymis prostate and seminal vesicles have only an autonomic nerve suppply via the inferior hypogastric plexus. Studies of the fine details are described as they occur in man and experimental animals. Experiments suggest that the innervation of the vas is seriously damaged by local anesthesia used for vasectomy or reanstamosis when attempted. However the mechanisms of veurotransmission in the vas remain controversial. The various theories of muscular activity of the vas are reviewed. These data may be useful in the design of reversible vas occlusion devices. The improved understanding may suggest simple and effective methods of reversible vasectomy. DA - 1974/// PY - 1974/// DO - 10.1016/s0015-0282(16)40220-7 VL - 25 IS - 2 SP - 186-202 ER - TY - CHAP TI - Consumer reference section AU - Berry, R. AU - King, M.W. AU - Vaisey, M. AU - Watts, B. T2 - Principles and practices of commercial farming (4th ed.) PY - 1974/// SP - 676-739 PB - [Winnipeg]: Faculty of Agriculture, University of Manitoba ER - TY - JOUR TI - STRUCTURAL STUDIES IN CONTINUOUS FILAMENT YARNS .1. STUDIES IN MODEL RIBBON YARNS AU - GUPTA, BS T2 - TEXTILE RESEARCH JOURNAL AB - In this, the first of a series of papers on fiber migration in continuous filament yarns, the broad objectives of the entire program of research are described. The experimental investigation included in this entire series is based on yarns produced under carefully controlled conditions which provided a bundle of either parallel filaments, for preparing yarns by the ideal ribbon method, or co-axial filaments, for yarns by the ideal circular method, prior to final twisting. It is shown that by a detailed study of migration in these extreme examples of carefully twisted yarns, it has been possible to obtain a much greater understanding of the nature and origin of migration which is generally observed in commercially prepared yarns than has been possible from the studies described thus far. Some of the important objectives emphasized in this study are: The proportion of total migration which cannot be assigned to any of the known and analysable causes of migration and thus must be of random nature; the extent of migration which can be assigned to the known and analysable causes; and the nature of the local variations in migration. The experimental investigation described in this first paper was restricted to the study of the yarns made by the ribbon method wherein the variables contre the positions of the tracers in the parent sheet of filaments, the initial twist in the strand, and the final twist and the twisting tension of the yarns being produced. DA - 1974/// PY - 1974/// DO - 10.1177/004051757404400207 VL - 44 IS - 2 SP - 125-135 SN - 0040-5175 ER - TY - JOUR TI - GENERALIZED MODEL FOR CRIMP ANALYSIS OF MULTICOMPONENT FIBERS .2. ILLUSTRATIVE EXAMPLE AU - BATRA, SK T2 - TEXTILE RESEARCH JOURNAL AB - The theoretical development of a generalized model to predict the crimp radius of a multi-component fiber has been reported in Part I [1]. The model is based on the linear theory of elasticity and attempts to provide a first-order estimate for multi-component fibers without any restrictions on the number of components or their geometrical arrangement in the cross section. This paper illustrates the application of the formulation in [1] to a bicomponent structure. Within the limitations of the basic assumptions, the influences of dimensionless parameters (geometrical and material) on the crimp radius are investigated in some detail. DA - 1974/// PY - 1974/// DO - 10.1177/004051757404400510 VL - 44 IS - 5 SP - 386-392 SN - 0040-5175 ER - TY - JOUR TI - GENERALIZED MODEL FOR CRIMP ANALYSIS OF MULTICOMPONENT FIBERS .1. THEORETICAL DEVELOPMENT AU - BATRA, SK T2 - TEXTILE RESEARCH JOURNAL AB - The present status of bicomponent fiber crimp frequency analysis is briefly reviewed. In order to develop a generalized model for the prediction of radius of curvature (or crimp frequency) of multi- (or bi-) component fiber, with an arbitrary shape of the cross-section and interfacial curves, the background of compound bars in the literature of classical theory of elasticity is also reviewed. Employing the semi-inverse method of St. Venant, the radius of curvature in the generalized case is derived through the use of the principle of minimum potential energy (see Appendix A). Both the limitations and the usefulness of the results are discussed. DA - 1974/// PY - 1974/// DO - 10.1177/004051757404400509 VL - 44 IS - 5 SP - 377-385 SN - 0040-5175 ER -