The fundamental unit of rapid, physiological color change in vertebrates is the dermal chromato- phore unit. This unit, comprised of cellular associations between different chromatophore types, is relatively conserved...The fundamental unit of rapid, physiological color change in vertebrates is the dermal chromato- phore unit. This unit, comprised of cellular associations between different chromatophore types, is relatively conserved across the fish, amphibian, and reptilian species capable of physiological color change and numerous attempts have been made to understand the nature of the four major chro- matophore types （melanophores, erythrophores, xanthophores, and iridophores） and their bio- chemical regulation. In this review, we attempt to describe the current state of knowledge regard- ing what classifies a pigment cell as a dynamic chromatophore, the unique characteristics of each chromatophore type, and how different hormones, neurotransmitters, or other signals direct pig- ment reorganization in a variety of vertebrate taxa.展开更多
NEWTON’s laws of motion predicted that light would travel faster from a moving source—it doesn’t.Einstein was convinced that unruly electrons had no place in an orderly,understandable universe.Both assumed that hum...NEWTON’s laws of motion predicted that light would travel faster from a moving source—it doesn’t.Einstein was convinced that unruly electrons had no place in an orderly,understandable universe.Both assumed that human knowledge could be perfected,mathematically,and that a coherent scientific account of the world we find ourselves in,not only exists,but is available and open to dedicated human enquiry.This paper argues that Hume,Kant and recent work on Hubble’s Constant render this idealistic position untenable.The remedy proposed is not to tighten scientific definitions ever further,but to reposition Science so as to prioritise the biosphere.This entails placing the process of living organisms centre stage,since they defy the Second Law of Thermodynamics,thereby reducing Uncertainty for all—an approach best exemplified in clinical medicine,where despite unbridgeable gaps in medical knowledge,healing can and does take place.Using Quaker insights developed in the 1650s,a non-theological pathway is offered which emphasises human creativity and social cohesion.Unhappily psychiatry today,under the guise of being 100%scientific in the Einstein way,discards three counts of millennial medical wisdom,with catastrophic consequences,as shown by scientifically valid data.A healthier approach to mental and social health,emphasising trust and consent,is described.展开更多
文摘The fundamental unit of rapid, physiological color change in vertebrates is the dermal chromato- phore unit. This unit, comprised of cellular associations between different chromatophore types, is relatively conserved across the fish, amphibian, and reptilian species capable of physiological color change and numerous attempts have been made to understand the nature of the four major chro- matophore types （melanophores, erythrophores, xanthophores, and iridophores） and their bio- chemical regulation. In this review, we attempt to describe the current state of knowledge regard- ing what classifies a pigment cell as a dynamic chromatophore, the unique characteristics of each chromatophore type, and how different hormones, neurotransmitters, or other signals direct pig- ment reorganization in a variety of vertebrate taxa.
文摘NEWTON’s laws of motion predicted that light would travel faster from a moving source—it doesn’t.Einstein was convinced that unruly electrons had no place in an orderly,understandable universe.Both assumed that human knowledge could be perfected,mathematically,and that a coherent scientific account of the world we find ourselves in,not only exists,but is available and open to dedicated human enquiry.This paper argues that Hume,Kant and recent work on Hubble’s Constant render this idealistic position untenable.The remedy proposed is not to tighten scientific definitions ever further,but to reposition Science so as to prioritise the biosphere.This entails placing the process of living organisms centre stage,since they defy the Second Law of Thermodynamics,thereby reducing Uncertainty for all—an approach best exemplified in clinical medicine,where despite unbridgeable gaps in medical knowledge,healing can and does take place.Using Quaker insights developed in the 1650s,a non-theological pathway is offered which emphasises human creativity and social cohesion.Unhappily psychiatry today,under the guise of being 100%scientific in the Einstein way,discards three counts of millennial medical wisdom,with catastrophic consequences,as shown by scientifically valid data.A healthier approach to mental and social health,emphasising trust and consent,is described.
