Discoveries In Physiology Research Articles

A Conversation with Samuel Refetoff, MD: How Treating One Family Stimulated a Lifelong Series of Major Discoveries in Thyroid Physiology and Disease.

None.

Responses of animals and plants to physiological doses of ethanol: a molecular messenger of hypoxia?

Our viewpoint is that ethanol could act as a molecular messenger in animal and plant organisms under conditions of hypoxia or other stresses and could elicit physiological responses to such conditions. There is evidence that both animal and plant organisms have endogenous levels of ethanol, but reports on the changes induced by this alcohol at physiological levels are sparse. Studies have shown that ethanol has different effects on cell metabolism at low and high concentrations, resembling a hormetic response. Further studies have addressed the potential cellular and molecular mechanisms used by organisms to sense changes in physiological concentrations of ethanol. This article summarizes the possible mechanisms by which ethanol may be sensed, particularly at the cell membrane level. Our analysis shows that current knowledge on this subject is limited. More research is required on the effects of ethanol at very low doses, in plants and animals at both molecular and physiological levels. We believe that further research on this topic could lead to new discoveries in physiology and may even help us understand metabolic adjustments related to climate change. As temperatures rise more frequently, dissolved oxygen levels drop, leading to hypoxic conditions and consequently, an increase in cellular ethanol levels.

Discoveries in Retina Physiology and Disease Biology Using Single-Cell RNA Sequencing.

The retina, a component of the central nervous system, is composed of six distinct neuronal types and various types of glial cells. A technique for single-cell transcriptome analysis called single-cell RNA sequencing (scRNA-seq) can be employed to study the complicated dynamics of several types of retinal cells. It meticulously examines how various cell types express their genes, shedding light on all biological processes. scRNA-seq is an alternative to regular RNA-seq, which cannot identify cellular heterogeneity. Understanding retinal diseases requires research on retinal cell heterogeneity. The identification of novel cell subpopulations can provide information about disease occurrence and progression as well as the specific biological functions of particular cells. We currently have a better understanding of the interactions among the brain, the retina, and its visual pathways thanks to the use of scRNA-seq to examine retinal development and disease pathogenesis. Additionally, this technology offers fresh perspectives on the sensitivity and molecular basis of cell subtypes linked to retinal diseases. Thanks to scRNA-seq technology, we now have a better understanding of the most recent developments and difficulties in retinal development and disorders. We believe that scRNA-seq is an important tool for developing cutting-edge treatments for retinal diseases. This paper presents a systematic review of the history of sRNA-seq technology development and provides an overview of the unique subtypes of retinal cells and the specific gene markers this technology identifies.

Canaries, camouflets, and carbon monoxide: making ‘Proto Man’ in Britain’s tunnelling war 1915–1918

ABSTRACT Focused mainly on the gas mask, historians of technology have paid little attention to the use of oxygen breathing apparatus in World War I. This article explores how an assemblage of technology, avian life, and experimental physiology resulted in the ‘Proto Man’ – a militarized mine rescuer vital for fighting Britain’s tunnelling war. Wartime mobilization of science pushed the improvement of oxygen equipment and the study of human performance. The success of ‘Proto Man’ was not narrowly limited to technical refinements of equipment or discoveries in physiology. Instead, this article argues for the centrality of the canary as a living gas detector endowing ‘Proto Man’ with more-than-human sensing of carbon monoxide. Easily surpassing chemical testing methods in utility and practicality, the trench canary provided an essential role for the non-human amidst the broad militarization of extreme environments during the twentieth century.

Fundamental Discovery in Physiology of the 21st Century and Validation of Psychoactive Substance Dependence

The article shows that the current level of physiology does not disclose the biological mechanisms of the organism transition from one range to adapt to a higher with an increase in the regular forces of the stimulus above sub-extreme. A new trend in the physiology of adaptation - proqredient adaptation, explains the mechanism of increasing the tolerance of the organism, with dependence on psychoactive substances (PAS). It is scientifically proved, that dependences of the organism on PAS not the disease, and the states like proqredient (progressive) adaptation.

Discomfort Glare Perception by Drivers—Establishing a Link between Subjective and Psychophysiological Assessment

The broad application of LEDs for automotive lighting purposes, together with new discoveries in vision physiology, is creating new challenges in the field of glare perception. The purpose of this study was to link subjective and objective measures of driver-perceived glare following different light sources used in car headlamps. In order to achieve this, a combination of subjective evaluation using an adapted version of the de Boer scale and objective measures based on psychophysiological data was applied. Predominantly, skin conductance response (SCR), heart rate variability (HRV), and eye-blinking frequency (vertical electrooculography, vEOG) were recorded. Though there was some evidence suggesting lower discomfort with glare from light sources with a lower correlated color temperature, the results were generally inconclusive. This illustrates the urgent need to study the linkage between light source properties and subjective and objective glare measures in deeper detail, so that the technical norms governing car headlamps can reflect the needs of human physiology and psychophysiology.

The ecology and physiology of fern gametophytes: A methodological synthesis.

All green plants alternate between the gametophyte and sporophyte life stages, but only seed‐free vascular plants (ferns and lycophytes) have independent, free‐living gametophytes. Fern and lycophyte gametophytes are significantly reduced in size and morphological complexity relative to their sporophytic counterparts and have often been overlooked in ecological and physiological studies. Understanding the ecological and physiological factors that directly impact this life stage is of critical importance because the ultimate existence of a sporophyte is dependent upon successful fertilization in the gametophyte generation. Furthermore, previous research has shown that the dual nature of the life cycle and the high dispersibility of spores can result in different geographic patterns between gametophytes and their respective sporophytes. This variation in distribution patterns likely exacerbates the separation of selective pressures acting on gametophyte and sporophyte generations, and can uniquely impact a species’ ecology and physiology. Here, we provide a review of historical and contemporary methodologies used to examine ecological and physiological aspects of fern gametophytes, as well as those that allow for comparisons between the two generations. We conclude by suggesting methodological approaches to answer currently outstanding questions. We hope that the information covered herein will serve as a guide to current researchers and stimulate future discoveries in fern gametophyte ecology and physiology.

Discoveries in Pancreatic Physiology and Disease Biology Using Single-Cell RNA Sequencing

Transcriptome analysis is used to study gene expression in human tissues. It can promote the discovery of new therapeutic targets for related diseases by characterizing the endocrine function of pancreatic physiology and pathology, as well as the gene expression of pancreatic tumors. Compared to whole-tissue RNA sequencing, single-cell RNA sequencing (scRNA-seq) can detect transcriptional activity within a single cell. The scRNA-seq had an invaluable contribution to discovering previously unknown cell subtypes in normal and diseased pancreases, studying the functional role of rare islet cells, and studying various types of cells in diabetes as well as cancer. Here, we review the recent in vitro and in vivo advances in understanding the pancreatic physiology and pathology associated with single-cell sequencing technology, which may provide new insights into treatment strategy optimization for diabetes and pancreatic cancer.

Renalase—A new understanding of its enzymatic and non‐enzymatic activity and its implications for future research

Renalase was first described in 2005 and since then it became an object of scientific interest because of its proposed ability to catalyse circulating neurotransmitters and its promising antihypertensive effects. However, further research on the enzymatic activity of renalase did not confirm these initial findings and yielded that renalase serves to oxidize isomeric forms of β-NAD(P)H and recycle them by forming β-NAD(P)+. Moreover, in contrast to initial assumptions, it is indicated that renalase's enzymatic activity is confined to the cell and that extracellular renalase loses its enzymatic properties. These new reports led scientists to question as to whether renalase, as an enzyme, still has the potential to influence various systemic physiological responses (e.g. blood pressure). It was also put into question whether many physiological discoveries published based on the notion that renalase is secreted into the blood and acts by oxidation of catecholamines can still be considered valid. In this article, we attempt to review the literature to confront these doubts and find further possible directions of research on the importance of renalase. Our aim was to evaluate recent reports of non-enzymatic activity for renalase.

Gastric Organoids: Progress and Remaining Challenges.

The stomach is a complex and physiologically necessary organ, yet large differences in physiology between mouse and human stomachs have impeded translation of physiological discoveries and drug screens performed using murine gastric tissues. Gastric cancer (GC) is a global health threat, with a high mortality rate and limited treatment options. The heterogeneous nature of GC makes it poorly suited for current “one size fits all” standard treatments. In this review, we discuss the rapidly evolving field of gastric organoids, with a focus on studies expanding cultures from primary human tissues and describing the benefits of mouse organoid models. We introduce the differing methods for culturing healthy gastric tissue from adult tissues or pluripotent stem cells, discuss the promise these systems have for preclinical drug screens, and highlight applications of organoids for precision medicine. Finally, we discuss the limitations of these models and look to the future to present potential ways gastric organoids will advance treatment options for patients with GC.

Reflections of an Outgoing Editor-in-Chief

Reflections of an Outgoing Editor-in-Chief

Update on Ghanem’s new scientific discoveries in physics, Physiology, and Medicine

Introduction and objective: To report the new scientific discoveries in physics, physiology and medicine by one author. Material and Methods: Results of my research are summarized. It is based on 2 clinical studies one prospective and the second case series on hyponatraemia (HN) of the transurethral resection of the prostate (TURP) syndrome. A physics study on porous orifice (G) tube proves Starling’s law is wrong. I reported prospective study on nephroptosis revealing its link with the loin pain haematuria syndrome (LPHS) and curative surgery for it. Results: Two physics and two physiological discoveries are reported. Acute HN presents as shock during surgery. It is induced by massive gain of sodium-free fluid recognized as volumetric overload shock (VOS). Features of the multiple organ dysfunction syndrome occur, include ARDS, Acute renal failure (ARF) and Coma. The prospective study demonstrated volumetric overload is the most significant in patho-aetiology. The case series demonstrated mistaking VOS for a known shock and treating it with further volume expansion cause death. Correct diagnoses as VOS and treating it with hypertonic sodium is lifesaving. The physics study on the G tube demonstrated that proximal, akin to arterial, pressure induces suction not filtration producing the hydrodynamic phenomenon that replaces Starling’s law. The link of LPHS with nephroptosis is demonstrated by the IVU 7 sign. The curative surgery for LPHS is renal sympathetic denervation and nephropexy. Conclusion: Dilution HN presents as shock that is mistaken for known shocks and treated with volume expansion causing death or ARDS. Manifestations include shock, ARDS, ARF and Coma. The correct treatment is hypertonic sodium. Starling s law has proved wrong. The correct replacement is the hydrodynamics of G tube. The puzzle of LPHS was also resolved.

Discoveries in structure and physiology of mechanically activated ion channels.

The ability to sense physical forces is conserved across all organisms. Cells convert mechanical stimuli into electrical or chemical signals via mechanically activated ion channels. In recent years, the identification of new families of mechanosensitive ion channels-such as PIEZO and OSCA/TMEM63 channels-along with surprising insights into well-studied mechanosensitive channels have driven further developments in the mechanotransduction field. Several well-characterized mechanosensory roles such as touch, blood-pressure sensing and hearing are now linked with primary mechanotransducers. Unanticipated roles of mechanical force sensing continue to be uncovered. Furthermore, high-resolution structures representative of nearly every family of mechanically activated channel described so far have underscored their diversity while advancing our understanding of the biophysical mechanisms of pressure sensing. Here we summarize recent discoveries in the physiology and structures of known mechanically activated ion channel families and discuss their implications for understanding the mechanisms of mechanical force sensing.

Update on Ghanem’s New Scientific Discoveries in physics, Physiology, and Medicine

Introduction and objective: To report the new scientific discoveries in physics, physiology and medicine by one author. Materials and methods: Results of my research are summarized. It is based on 2 clinical studies one prospective and the second case series on Hyponatraemia (HN) of The Transurethral Resection of the Prostate (TURP) syndrome. A physics study on porous orifice (G) tube proves Starling’s law is wrong. I reported prospective study on nephroptosis revealing its link with the Loin Pain Haematuria Syndrome (LPHS) and curative surgery for it. Results: Two physics and two physiological discoveries are reported. Acute HN presents as shock during surgery. It is induced by massive gain of sodium-free fluid recognized as Volumetric Overload Shock (VOS). Features of the multiple organ dysfunction syndrome occur, include ARDS, Acute Renal Failure (ARF) and Coma. The prospective study demonstrated volumetric overload is the most significant in patho-aetiology. The case series demonstrated mistaking VOS for a known shock and treating it with further volume expansion cause death. Correct diagnoses as VOS and treating it with hypertonic sodium are lifesaving. The physics study on the G tube demonstrated that proximal, akin to arterial, pressure induces suction not filtration producing the hydrodynamic phenomenon that replaces Starling’s law. The link of LPHS with nephroptosis is demonstrated by the IVU 7 sign. The curative surgery for LPHS is renal sympathetic denervation and nephropexy. Conclusion: Dilution HN presents as shock that is mistaken for known shocks and treated with volume expansion causing death or ARDS. Manifestations include shock, ARDS, ARF and Coma. The correct treatment is hypertonic sodium. Starling s law has proved wrong. The correct replacement is the hydrodynamics of G tube. The puzzle of LPHS was also resolved.

Essential Role of Hemoglobin βCys93 in Cardiovascular Physiology.

The supply of oxygen to tissues is controlled by microcirculatory blood flow. One of the more surprising discoveries in cardiovascular physiology is the critical dependence of microcirculatory blood flow on a single conserved cysteine within the β-subunit (βCys93) of hemoglobin (Hb). βCys93 is the primary site of Hb S-nitrosylation [i.e., S-nitrosothiol (SNO) formation to produce S-nitrosohemoglobin (SNO-Hb)]. Notably, S-nitrosylation of βCys93 by NO is favored in the oxygenated conformation of Hb, and deoxygenated Hb releases SNO from βCys93. Since SNOs are vasodilatory, this mechanism provides a physiological basis for how tissue hypoxia increases microcirculatory blood flow (hypoxic autoregulation of blood flow). Mice expressing βCys93A mutant Hb (C93A) have been applied to understand the role of βCys93, and RBCs more generally, in cardiovascular physiology. Notably, C93A mice are unable to effect hypoxic autoregulation of blood flow and exhibit widespread tissue hypoxia. Moreover, reactive hyperemia (augmentation of blood flow following transient ischemia) is markedly impaired. C93A mice display multiple compensations to preserve RBC vasodilation and overcome tissue hypoxia, including shifting SNOs to other thiols on adult and fetal Hbs and elsewhere in RBCs, and growing new blood vessels. However, compensatory vasodilation in C93A mice is uncoupled from hypoxic control, both peripherally (e.g., predisposing to ischemic injury) and centrally (e.g., impairing hypoxic drive to breathe). Altogether, physiological studies utilizing C93A mice are confirming the allosterically controlled role of SNO-Hb in microvascular blood flow, uncovering essential roles for RBC-mediated vasodilation in cardiovascular physiology and revealing new roles for RBCs in cardiovascular disease.

The Nobel Mabel. The woman who discovered that low oxygen stimulates hemoglobin production.

The research of Mabel Purefoy FitzGerald (1872-1973) was recently recognized by Sir Peter Ratcliffe in his public lecture at the awarding of the Nobel Prize in Physiology or Medicine as a critical step in the recent delineation of the oxygen sensing pathway. This brief article offers a tantalizing glimpse into the life of a woman whose scientific career spanned four countries, worked with eminent scientists and clinicians including Haldane and Osler, and published important physiologic discoveries. Her accomplishments and astounding life were lost to history for more than one hundred years and it is time to bring her back. When this diminutive and proper English woman set out on her own to the wild and remote mining towns of Colorado, little did she know that this would be the moment for which she would be remembered in her long, productive research career and ludicrous struggle to become a physician more than a century ago. Hers is an extraordinary tale of privilege, hardship, discrimination, shocking perseverance, and grand adventure.

New Discoveries in Medicine and Physiology Originated in Urology

Surgical Medicine Open Access Journal New Discoveries in Medicine and Physiology Originated in Urology Ahmed N Ghanem* Department of Urology, Egypt *Corresponding author: Ahmed N Ghanem, Department of Urology, Egypt Submission: January 07, 2020;Published: February 20, 2020 DOI: 10.31031/SMOAJ.2020.03.000564 ISSN 2578-0379 Volume3 Issue3

Update on Ghanem’s New Scientific Discoveries in Physics, Physiology, and Medicine

Introduction and objective: To report the new scientific discoveries in physics, physiology and medicine by one author. Materials and methods: Results of my research are summarized. It is based on 2 clinical studies one prospective and the second case series on Hyponatraemia (HN) of The Transurethral Resection of the Prostate (TURP) syndrome. A physics study on porous orifice (G) tube proves Starling’s law is wrong. I reported prospective study on nephroptosis revealing its link with the Loin Pain Haematuria Syndrome (LPHS) and curative surgery for it. Results: Two physics and two physiological discoveries are reported. Acute HN presents as shock during surgery. It is induced by massive gain of sodium-free fluid recognized as Volumetric Overload Shock (VOS). Features of the multiple organ dysfunction syndrome occur, include ARDS, Acute Renal Failure (ARF) and Coma. The prospective study demonstrated volumetric overload is the most significant in patho-aetiology. The case series demonstrated mistaking VOS for a known shock and treating it with further volume expansion cause death. Correct diagnoses as VOS and treating it with hypertonic sodium are lifesaving. The physics study on the G tube demonstrated that proximal, akin to arterial, pressure induces suction not filtration producing the hydrodynamic phenomenon that replaces Starling’s law. The link of LPHS with nephroptosis is demonstrated by the IVU 7 sign. The curative surgery for LPHS is renal sympathetic denervation and nephropexy. Conclusion: Dilution HN presents as shock that is mistaken for known shocks and treated with volume expansion causing death or ARDS. Manifestations include shock, ARDS, ARF and Coma. The correct treatment is hypertonic sodium. Starling s law has proved wrong. The correct replacement is the hydrodynamics of G tube. The puzzle of LPHS was also resolved.

A 20-year experience in surgical treatment of steno-occlusive lesion of craniocervical arteries at the Burdenko Neurosurgical Center

Surgical treatment of cerebral ischemia at the Burdenko Neurosurgical Center for the period from 1999 to 2019 is analyzed in the paper. The details of the treatment strategy in patients with steno-occlusive lesion of craniocervical arteries followed by cerebral ischemia developed over 20 years are discussed in the article. We have analyzed the features of surgical interventions on the major craniocervical arteries in a neurosurgical clinic and the results of this treatment. To demonstrate management of various lesions of major cerebral arteries in modern neurosurgical vascular hospital. In total, there were 3098 interventions on the major cerebral arteries in 2527 patients for this period. Mean age of patients ranged from 1.5 to 91 years (58±14 years). Interventions included open reconstructions of the carotid arteries (2031 surgeries), reconstructions of the vertebrobasilar arteries (135 surgeries), brain revascularization (658 surgeries), excision of the tumors of neurovascular bundle on the neck compressing carotid arteries (51 interventions). Endovascular interventions were performed in 223 cases and consisted of angioplasty and stenting of the extracranial segments of craniocervical arteries (185 surgeries), stenting of the intracranial arteries (30 surgeries) and endovascular thrombextraction (8 cases). Staged surgeries were performed in 541 patients (22.3%). Favorable outcomes were obtained in 87.6% of cases, satisfactory results - in 9% of patients. Clinical deterioration due to long-term postoperative complications and recurrent strokes occurred in 2.9% of cases. Postoperative morbidity rate was 4.6%, persistent neurological deficit developed in 2.6% of cases. Mortality rate was 0.5%. Surgical treatment of stenotic and occlusive lesion of the major cerebral arteries is an interdisciplinary problem. Solution of this issue is closely associated with technological progress, new discoveries in normal and pathological physiology, as well as clinical researches. Individualized choice of surgical approach is one the main modern trends of neurosurgical approach to this problem. At the same time, own surgical experience is the most important factor determining the results of arterial reconstructions.

Physiological discoveries abound within NASA samples

Physiological discoveries abound within NASA samples