Many people may be interested in Paleontology since the subject allows for large amounts of imagination and freedom in the creation of scenes. Dinosaurs draw the biggest interest because of their diversity in peculiar...Many people may be interested in Paleontology since the subject allows for large amounts of imagination and freedom in the creation of scenes. Dinosaurs draw the biggest interest because of their diversity in peculiar forms and often unusually large size of many species. There are people like artists who help the field paleontologists to describe, interpret and reconstruct fossils, and others that create drawings, restorations, sculptures and, most recently, computer animations for science, art and joy. To this end, a successful professional should have specific knowledge that will allow them to produce high-quality work. The current paper aims at: 1) providing knowledge on various topics of Paleontology, in order to understand the time scale of life on earth, its evolution and diversity;2) generating appreciation for the evolution of climatic conditions, continental plates and movement and the Mesozoic environment in which dinosaurs evolved;3) offering an understanding of scientific nomenclature used in Paleontology, and interpretation of drawings and meanings;4) helping one to realize how scientists extract information from bones, tracks, eggs, embryos and other remains;5) examining the physiology of dinosaurs, their metabolism, behaviors, growth rates estimated lifetime and diet;and 6) leading to the understanding of the relations between different dinosaur species and how Paleontologists complete missing parts from uncomplete skeletons. Examining the evolution of life, we observe that life began about 3.8 billion years ago in the deep sea. The first simple animals such as worms and jellyfish appeared in the oceans around 600 mya. The crust of the earth continuously moves to produce changes in the land masses and changes in the climatic conditions that affect the evolution of life. The life of the earth is divided into geological eras. At the end of each geological era, a major event of extinction occurred, which every time obliterated important groups of life. Dinosauria was one of the most successful clades of animals that lived on terrestrial ecosystems for over 160 million years, but was extinct at one of the major extinction events 66 mya. The remains of animals allow scientists and artists to recreate their forms usually in great detail and extract a lot of information about their lives. The paper describes in detail how and where to find information and explains how to interpret them in order to understand the meanings. The paper presents all the above in a simplified way giving the required knowledge without using difficult scientific terms and provides the essential knowledge to the interested person to appreciate the science of Paleontology.展开更多
Dinosaurs due to their diverse species and peculiar forms have drawn the interest of both artists and scientists. One way to unlock the unknown life of dinosaurs is to reconstruct dinosaurs through drawings, computer ...Dinosaurs due to their diverse species and peculiar forms have drawn the interest of both artists and scientists. One way to unlock the unknown life of dinosaurs is to reconstruct dinosaurs through drawings, computer animations or sculptures. Following the Introduction on “Dinosaur Reconstruction” by the present authors, where important Paleontological knowledge was presented, the next step is to examine some specific information along with necessary details for dinosaur reconstruction. The first and basic step to be taken for a reconstruction is the posture of the animal;this is the theme of the current paper. Dinosaurs would move either bipedally or quadrupedally depending on their kind and body construction. Based on the available literature, various issues in relation to the posture of an animal at different instances are examined. These are: postures of bipedal dinosaurs during walking, observation of living bipedal animals, postures of quadruped dinosaurs during walking, feeding styles, and dinosaur tails. Theropods had a locomotor behavior like modern birds, with the step width increasing when the animals decreased speed. The general posture and movement of quadrupeds and especially sauropods, remains a subject of great and much controversy. Some scientists believe that sauropod necks were generally held in a neutral or undeflected state during most of the time, while others believe that sauropod necks behaved like all present-day amniote with the mid-cervical region held nearly vertical. Also, there are indications that dinosaurs usually held their tails above ground. For all dinosaurs, the long tail was acting as a counterbalance to the head and body. As a validating example, the case of Amargasaurus is investigated with the help of a model, where the various positions of the animal are examined. A certain posture was chosen for a full-size steel and concrete reconstruction based on the features of the animal.展开更多
Complex facial trauma requires complex repair and solutions.This process is challenging for the surgeon who seeks to manage the expectations of the patient and family while achieving the best possible result.Historica...Complex facial trauma requires complex repair and solutions.This process is challenging for the surgeon who seeks to manage the expectations of the patient and family while achieving the best possible result.Historically,the use of pedicled flaps,and then free tissue transfer,were the primary techniques utilized.Advancements in soft-tissue reconstruction,such as perforator flaps and pre-expanded and prefabricated flaps,allow refinement of the soft-tissue reconstruction process to create the best initial soft-tissue coverage.The advent of contemporary technologies,such as virtual surgical planning,stereolithography and customized implants and plates,facilitates a tailored approach to the patient’s reconstructive needs for precise bony reconstruction.When surgical and technological techniques are combined in complementary multistage reconstructions,better reconstructive and aesthetic outcomes are achievable than ever before.In this review,the authors present a summary of the management of complex facial trauma based on the senior author’s broad experience.Initial management and contemporary reconstructive techniques and technology to provide optimal outcomes are reviewed.A case series of complex facial traumas and their reconstructive process is also presented to demonstrate how complementary staged procedures can yield an optimal result.We believe the reconstructive surgeon managing complex facial trauma should strive to incorporate contemporary technologies and techniques into their armamentarium to provide the best patient care.展开更多
文摘Many people may be interested in Paleontology since the subject allows for large amounts of imagination and freedom in the creation of scenes. Dinosaurs draw the biggest interest because of their diversity in peculiar forms and often unusually large size of many species. There are people like artists who help the field paleontologists to describe, interpret and reconstruct fossils, and others that create drawings, restorations, sculptures and, most recently, computer animations for science, art and joy. To this end, a successful professional should have specific knowledge that will allow them to produce high-quality work. The current paper aims at: 1) providing knowledge on various topics of Paleontology, in order to understand the time scale of life on earth, its evolution and diversity;2) generating appreciation for the evolution of climatic conditions, continental plates and movement and the Mesozoic environment in which dinosaurs evolved;3) offering an understanding of scientific nomenclature used in Paleontology, and interpretation of drawings and meanings;4) helping one to realize how scientists extract information from bones, tracks, eggs, embryos and other remains;5) examining the physiology of dinosaurs, their metabolism, behaviors, growth rates estimated lifetime and diet;and 6) leading to the understanding of the relations between different dinosaur species and how Paleontologists complete missing parts from uncomplete skeletons. Examining the evolution of life, we observe that life began about 3.8 billion years ago in the deep sea. The first simple animals such as worms and jellyfish appeared in the oceans around 600 mya. The crust of the earth continuously moves to produce changes in the land masses and changes in the climatic conditions that affect the evolution of life. The life of the earth is divided into geological eras. At the end of each geological era, a major event of extinction occurred, which every time obliterated important groups of life. Dinosauria was one of the most successful clades of animals that lived on terrestrial ecosystems for over 160 million years, but was extinct at one of the major extinction events 66 mya. The remains of animals allow scientists and artists to recreate their forms usually in great detail and extract a lot of information about their lives. The paper describes in detail how and where to find information and explains how to interpret them in order to understand the meanings. The paper presents all the above in a simplified way giving the required knowledge without using difficult scientific terms and provides the essential knowledge to the interested person to appreciate the science of Paleontology.
文摘Dinosaurs due to their diverse species and peculiar forms have drawn the interest of both artists and scientists. One way to unlock the unknown life of dinosaurs is to reconstruct dinosaurs through drawings, computer animations or sculptures. Following the Introduction on “Dinosaur Reconstruction” by the present authors, where important Paleontological knowledge was presented, the next step is to examine some specific information along with necessary details for dinosaur reconstruction. The first and basic step to be taken for a reconstruction is the posture of the animal;this is the theme of the current paper. Dinosaurs would move either bipedally or quadrupedally depending on their kind and body construction. Based on the available literature, various issues in relation to the posture of an animal at different instances are examined. These are: postures of bipedal dinosaurs during walking, observation of living bipedal animals, postures of quadruped dinosaurs during walking, feeding styles, and dinosaur tails. Theropods had a locomotor behavior like modern birds, with the step width increasing when the animals decreased speed. The general posture and movement of quadrupeds and especially sauropods, remains a subject of great and much controversy. Some scientists believe that sauropod necks were generally held in a neutral or undeflected state during most of the time, while others believe that sauropod necks behaved like all present-day amniote with the mid-cervical region held nearly vertical. Also, there are indications that dinosaurs usually held their tails above ground. For all dinosaurs, the long tail was acting as a counterbalance to the head and body. As a validating example, the case of Amargasaurus is investigated with the help of a model, where the various positions of the animal are examined. A certain posture was chosen for a full-size steel and concrete reconstruction based on the features of the animal.
文摘Complex facial trauma requires complex repair and solutions.This process is challenging for the surgeon who seeks to manage the expectations of the patient and family while achieving the best possible result.Historically,the use of pedicled flaps,and then free tissue transfer,were the primary techniques utilized.Advancements in soft-tissue reconstruction,such as perforator flaps and pre-expanded and prefabricated flaps,allow refinement of the soft-tissue reconstruction process to create the best initial soft-tissue coverage.The advent of contemporary technologies,such as virtual surgical planning,stereolithography and customized implants and plates,facilitates a tailored approach to the patient’s reconstructive needs for precise bony reconstruction.When surgical and technological techniques are combined in complementary multistage reconstructions,better reconstructive and aesthetic outcomes are achievable than ever before.In this review,the authors present a summary of the management of complex facial trauma based on the senior author’s broad experience.Initial management and contemporary reconstructive techniques and technology to provide optimal outcomes are reviewed.A case series of complex facial traumas and their reconstructive process is also presented to demonstrate how complementary staged procedures can yield an optimal result.We believe the reconstructive surgeon managing complex facial trauma should strive to incorporate contemporary technologies and techniques into their armamentarium to provide the best patient care.
