Clarksville, Tennessee, has a fascinating railroad history. The push for a railroad in the community dates to the 1830s, but it wasn't until 1852 that the state of Tennessee chartered the Memphis, Clarksville & Louisville Railroad. A street railroad, in one form or another, operated in Clarksville from 1885 until 1928. Mules powered the first cars, and the line later electrified. What is perhaps most interesting about streetcars in the city is the sheer number of companies organized to operate. Considering the history of the city's street railway system stretches less than a half-century, its history is dizzying.
This 3-volume handbook brings together contributions by the world ́s leading specialists that reflect the broad spectrum of modern palaeoanthropology, thus presenting an indispensable resource for professionals and students alike. Vol. 1 reviews principles, methods, and approaches, recounting recent advances and state-of-the-art knowledge in phylogenetic analysis, palaeoecology and evolutionary theory and philosophy. Vol. 2 examines primate origins, evolution, behaviour, and adaptive variety, emphasizing integration of fossil data with contemporary knowledge of the behaviour and ecology of living primates in natural environments. Vol. 3 deals with fossil and molecular evidence for the evolution of Homo sapiens and its fossil relatives.
The study of primate locomotion is a unique discipline that by its nature is interdis ciplinary, drawing on and integrating research from ethology, ecology, comparative anat omy, physiology, biomechanics, paleontology, etc. When combined and focused on particular problems this diversity of approaches permits unparalleled insight into critical aspects of our evolutionary past and into a major component of the behavioral repertoire of all animals. Unfortunately, because of the structure of academia, integration of these different approaches is a rare phenomenon. For instance, papers on primate behavior tend to be published in separate specialist journals and read by subgroups of anthropologists and zoologists, thus precluding critical syntheses. In the spring of 1995 we overcame this compartmentalization by organizing a con ference that brought together experts with many different perspectives on primate locomo tion to address the current state of the field and to consider where we go from here. The conference, Primate Locomotion-1995, took place thirty years after the pioneering confer ence on the same topic that was convened by the late Warren G. Kinzey at Davis in 1965.
This 3-volume handbook brings together contributions by the world ́s leading specialists that reflect the broad spectrum of modern palaeoanthropology, thus presenting an indispensable resource for professionals and students alike. Vol. 1 reviews principles, methods, and approaches, recounting recent advances and state-of-the-art knowledge in phylogenetic analysis, palaeoecology and evolutionary theory and philosophy. Vol. 2 examines primate origins, evolution, behaviour, and adaptive variety, emphasizing integration of fossil data with contemporary knowledge of the behaviour and ecology of living primates in natural environments. Vol. 3 deals with fossil and molecular evidence for the evolution of Homo sapiens and its fossil relatives.
How can geckoes walk on the ceiling and basilisk lizards run over water? What are the aerodynamic effects that enable small insects to fly? What are the relative merits of squids' jet-propelled swimming and fishes' tail-powered swimming? Why do horses change gait as they increase speed? What determines our own vertical leap? Recent technical advances have greatly increased researchers' ability to answer these questions with certainty and in detail. This text provides an up-to-date overview of how animals run, walk, jump, crawl, swim, soar, hover, and fly. Excluding only the tiny creatures that use cilia, it covers all animals that power their movements with muscle--from roundworms to whales, clams to elephants, and gnats to albatrosses. The introduction sets out the general rules governing all modes of animal locomotion and considers the performance criteria--such as speed, endurance, and economy--that have shaped their selection. It introduces energetics and optimality as basic principles. The text then tackles each of the major modes by which animals move on land, in water, and through air. It explains the mechanisms involved and the physical and biological forces shaping those mechanisms, paying particular attention to energy costs. Focusing on general principles but extensively discussing a wide variety of individual cases, this is a superb synthesis of current knowledge about animal locomotion. It will be enormously useful to advanced undergraduates, graduate students, and a range of professional biologists, physicists, and engineers.
Finalist for the National Book Award When Lonnie was seven years old, his parents died in a fire. Now he's eleven, and he still misses them terribly. And he misses his little sister, Lili, who was put into a different foster home because "not a lot of people want boys-not foster boys that ain't babies." But Lonnie hasn't given up. His foster mother, Miss Edna, is growing on him. She's already raised two sons and she seems to know what makes them tick. And his teacher, Ms. Marcus, is showing him ways to put his jumbled feelings on paper. Told entirely through Lonnie's poetry, we see his heartbreak over his lost family, his thoughtful perspective on the world around him, and most of all his love for Lili and his determination to one day put at least half of their family back together. Jacqueline Woodson's poignant story of love, loss, and hope is lyrically written and enormously accessible.
From flying pterodactyls to walking primates, the story of life as told through the evolution of locomotion. Most of us never think about how we get from one place to another. For most people, putting one foot in front of the other requires no thought at all. Yet the fact that we and other species are able to do so is one of the great triumphs of evolution. To truly understand how life evolved on Earth, it is crucial to understand movement. Restless Creatures makes the bold new argument that the true story of evolution is the story of locomotion, from the first stirrings of bacteria to the amazing feats of Olympic athletes. By retracing the four-billion-year history of locomotion, evolutionary biologist Matt Wilkinson shows how the physical challenges of moving from place to place-when coupled with the implacable logic of natural selection-offer a uniquely powerful means of illuminating the living world. Whales and dolphins look like fish because they have been molded by the constraints of underwater locomotion. The unbending physical needs of flight have brought bats, birds, and pterodactyls to strikingly similar anatomies. Movement explains why we have opposable thumbs, why moving can make us feel good, how fish fins became limbs, and even why-classic fiction notwithstanding-there are no flying monkeys nor animals with wheels. Even plants aren't immune from locomotion's long reach: their seeds, pollen, and very form are all determined by their aptitude to disperse. From sprinting cheetah to spinning maple fruit, soaring albatross to burrowing worm, crawling amoeba to running human-all are the way they are because of how they move. There is a famous saying: "nothing in biology makes sense unless in the light of evolution." As Wilkinson makes clear: little makes sense unless in the light of locomotion. A powerful yet accessible work of evolutionary biology, Restless Creatures is the essential guide for understanding how life on Earth was shaped by the simple need to move from point A to point B.
Authored by an acknowledged expert on muscle and movement imbalances, this well illustrated book presents a classification system of mechanical pain syndromes that is designed to direct the exercise prescription and the correction of faulty movement patterns. The diagnostic categories, associated muscle and movement imbalances, recommendations for treatment, examination, exercise principles, specific corrective exercises, and modification of functionalactivities for case management are described in detail. This book is designed to give practitioners an organized and structured method of analyzing the mechanical cause of movement impairment syndrome, the contributing factors and a strategy for management. * Provides the tools for the physical therapist to identify movement imbalances, establish the relevant diagnosis, develop the corrective exercise prescription and carefully instruct the patient about how to carry out the exercise program. * Authored by the acknowledged expert on movement system imbalances. * Covers both the evaluation process and therapeutic treatment. * Detailed descriptions of exercises for the student or practitioner. * Includes handouts to be photocopied and given to the patient for future reference.
Three distinct types of contractions perform colonic motility functions. Rhythmic phasic contractions (RPCs) cause slow net distal propulsion with extensive mixing/turning over. Infrequently occurring giant migrating contractions (GMCs) produce mass movements. Tonic contractions aid RPCs in their motor function. The spatiotemporal patterns of these contractions differ markedly. The amplitude and distance of propagation of a GMC are several-fold larger than those of an RPC. The enteric neurons and smooth muscle cells are the core regulators of all three types of contractions. The regulation of contractions by these mechanisms is modifiable by extrinsic factors: CNS, autonomic neurons, hormones, inflammatory mediators, and stress mediators. Only the GMCs produce descending inhibition, which accommodates the large bolus being propelled without increasing muscle tone. The strong compression of the colon wall generates afferent signals that are below nociceptive threshold in healthy subjects. However, these signals become nociceptive; if the amplitudes of GMCs increase, afferent nerves become hypersensitive, or descending inhibition is impaired. The GMCs also provide the force for rapid propulsion of feces and descending inhibition to relax the internal anal sphincter during defecation. The dysregulation of GMCs is a major factor in colonic motility disorders: irritable bowel syndrome (IBS), inflammatory bowel disease (IBD), and diverticular disease (DD). Frequent mass movements by GMCs cause diarrhea in diarrhea predominant IBS, IBD, and DD, while a decrease in the frequency of GMCs causes constipation. The GMCs generate the afferent signals for intermittent short-lived episodes of abdominal cramping in these disorders. Epigenetic dysregulation due to adverse events in early life is one of the major factors in generating the symptoms of IBS in adulthood.
