Plasmonic Sensor Based On Silver Nanoparticles For The Detection of Glucose

Sensors for detecting glucose concentrations are crucial to medical testing. Here, we introduce silver nanoparticles (Ag NPs) uniformly distributed in space to investigate the sensing properties for detecting glucose by using the finite-different time-domain (FDTD) and experimental methods. The results show that the transmittance of dip for the proposed structural model gradually decreases as the number of Ag NPs increases, when the concentration of glucose is constant. And the transmission spectrum shows slight red shift with the increasing of the glucose concentration. Moreover, the simulation results are in agreement with the experimental results. Especially, the maximum sensitivity S=1144.07407 nm/RIU can be realized for glucose concentration variation from 0.3 to 0.4 mol/L. The research results reveal an excellent sensing property that has important application value in medical detection.

Terahertz radiation in ophthalmology (review)

Terahertz (THz) radiation is one of the new, intensively studied interdisciplinary fi elds of scientifi c knowledge, including medicine, in the fi rst decades of the 21st century. At the beginning of this article (review), in a brief form, the basic statements on THz radiation, the main parameters and properties are presented; the modern THz biophtonics technologies used in biology and medicine are considered – THz refl ectometry, THz spectroscopy methods. Then a number of directions and examples of possible use of THz technologies in biology and medicine, including pharmaceuticals, are given. The main part of the review presents the progress of experimental research and the prospects for the clinical application of medical technologies of THz spectroscopy, THz imaging, in ophthalmology in the study of the morphological and functional state of the ocular surface structures, diagnosis, medical testing, and treatment of ophthalmopathology of the ocular surface. The article concludes with a review of experimental studies on the safety of using THz waves for medical diagnostics and treatment of ophthalmopathology. In the fi nal part, the main problems and prospects of introducing medical THz technologies into the clinical practice of an ophthalmologist are considered.

Introduction: Diagnostics, Medical Testing, and Value in Medical Anthropology

Introduction to the Special Issue on Diagnostics, Medical testing, and Value

Why Perfect Tests May Not Be Worth Waiting For: Information as a Commodity

Information products provide agents with additional information that can be used to update actions. In many situations, access to such products can be quite limited. For instance, in epidemics, there tends to be a limited supply of medical testing kits, or tests. These tests are information products because their output of a positive or a negative answer informs individuals and authorities on the underlying state and the appropriate course of action. In this paper, using an analytical model, we show how the accuracy of a test in detecting the underlying state affects the demand for the information product differentially across heterogeneous agents. Correspondingly, the test accuracy can serve as a rationing device to ensure that the limited supply of information products is appropriately allocated to the heterogeneous agents. When test availability is low and the social planner is unable to allocate tests in a targeted manner to the agents, we find that moderately good tests can outperform perfect tests in terms of social outcome. This paper was accepted by Charles Corbett, operations management.

Bioethical Quandaries during the Period of a Pandemic

The period of the pandemic gave rise to multiple and intractable bioethical quandaries arising. In the context of the present study, we will limit ourselves to the examination of the critical issues of mandatory vaccination to manage the pandemic; compulsory medical testing, including temperature screening of the population; the use of experimental drugs; making the wearing of face masks mandatory; and the individual responsibility of each of us for the prevention of the pandemic. Participation stresses the importance of education in bioethics. Accordingly, it supports the notion that, once we win the fight for life and health, constitutional lawyers ought to take the reins and determine that the character of restrictive measures and healthcare policies adopted in periods of crisis, when a prime opportunity for their formulation presented itself because of the pandemic, is one of extraordinariness.

Relating SARS-CoV-2 shedding rate in wastewater to daily positive tests data: A consistent model based approach

During the COVID-19 pandemic, wastewater-based epidemiology (WBE) has been engaged to complement medical surveillance and in some cases to also act as an early diagnosis indicator of viral spreading in the community. Most efforts worldwide by the scientific community and commercial companies focused on the formulation of protocols for SARS CoV-2 analysis in wastewater and approaches addressing the quantitative relationship between WBE and medical surveillance are lacking. In the present study, a mathematical model is developed which uses as input the number of daily positive medical tests together with the highly non-linear shedding rate curve of individuals to estimate the evolution of virus shedding rate in wastewater along calendar days. A comprehensive parametric study by the model using medical surveillance data for the city of Thessaloniki (~700,000 inhabitants, North Greece) reveals the conditions under which WBE can be used as an early warning tool for predicting pandemic outbreaks. It is shown that early warning capacity is not the same along the days of an outbreak and varies strongly with the number of days apart between the day of maximum shedding rate of individuals in their disease cycle and the day of their medical testing. Moreover, the present data show that there exists a proportion between unreported cases (asymptomatic persons and patients with mild symptoms that do not seek medical advice) and reported cases. The proportion is not steady but increases with the number of reported cases. The early detection capacity of WBE improves substantially in the presence of an increasing number of unreported cases. For Thessaloniki at the peak of the pandemic in mid-November 2020, the number of unreported cases reached a maximum around 4 times the number of reported people.

‘In the Meantime’: Ordinary Life in Continuous Medical Testing for Lung Cancer

Based on ethnographic fieldwork among Danes undergoing CT scans as part of follow-up testing for potential lung cancer, we explore how access to technologies generates diagnostic uncertainty and trends of continuous testing. Our research is set in the context of a welfare state that has cultivated forms of government whose public health branches focus on early diagnosis and cancer control. Many studies on biotechnologies emphasise subject-making and power relations. Inspired by the work of Veena Das, we adopt an approach that focuses on the entanglement of diagnostic investigations with everyday life. We argue that being followed establishes a mode of being which we call ‘in the meantime’. Life in the meantime is equally characterised by a dramatic mode of being—that is, waiting for death—and an ambiguous mode of being: feeling quite well. As with any life crisis, it involves some sense of agency. We show in this paper how life in the meantime informs an ordinary ethics that encourages three ethical concerns in everyday life: firstly, how to inhabit life in the meantime? Secondly, what good is the testing for? And finally, what is a good death?

Guidelines for Reopening a Nation in a SARS-CoV-2 Pandemic: A Path Forward

Action, not fear, is the path forward in the coronavirus infectious disease 2019 (COVID-19) pandemic. Since early 2020, the world’s nations have faced conundrums over severe acute respiratory syndrome corona virus type 2 (SARS-CoV-2) infections resulting in COVID-19 resulting in national closures, and thus, a clear understandable plan that nations can implement is required to reopen. The healthcare benefits of reopening a nation more likely than not exceed the benefits of continued pandemic-related closure. Pandemic-related closures have resulted in countless delayed or avoided urgent care evaluations. Furthermore, routine care of acute and chronic illnesses, including evaluations, diagnoses, and treatments, has also been delayed. Isolation, loss of income, and fear have resulted in mental health conditions or exacerbated existing conditions. The magnitude of untoward ramifications is unknown and may ultimately represent an inestimable degree of danger and morbidity, and even death. Purpose. The pandemic of SARS-CoV-2 has created an atmosphere of fear of COVID-19 that has directly and indirectly injured the world’s population. Since this has resulted in increasing morbidity and mortality, creating economic chaos, and near systemic collapse of educational systems with no well described plan forward, it is the purpose of this study to provide guidelines that provide a path forward to safely open a nation. Physicians often equipped by their education, training, and experiences across disciplines are uniquely positioned to comprehend, coordinate, and teach other physicians, business owners, and municipal and government leaders from guidelines. As such, physicians may take the lead in a path forward to reopening a nation, including opening businesses, educational facilities, and religious establishments, while minimizing the risk of SARS-CoV-2 infection. Method. Reviews of the literature among the disciplines of environmental air, sanitation, social interaction, medical testing, vaccination, protection, and disease prevention and safety allowed for the conceptualization and eventual genesis of identifiable interventions which either reduce the viral load in the environment or inactivate the virus from replication. Each of the guidelines was selected based on the principle that it involved the elimination or inactivation of the viral particle. With a reduction in viral load or inactivation of replication, the implementation of these guidelines is expected to allow for reopening a nation with an increased level of safety. Results. The guidelines identified, including air exchange (ventilation), air filtration, personal protective filtering devices (masks), hand hygiene, social distancing, screening and testing, vaccines, high-risk patient protection, medical management, and adjunctive therapies, are described and referenced. Conclusions. In that the pandemic is primarily a public health issue, the path forward is best coordinated by local, regional, and national physicians. Many physicians with a breadth of experiences are uniquely positioned to coordinate the implementation of these interdisciplinary guidelines. Using these guidelines as a planned, coordinated action, not fear, is a path forward. Nations have a decision to make: closuring versus opening.