Irreversible Death Research Articles

The Correlation of Oxidative Stress Markers and Biochemical Cardiac Enzymes in Iraqi Patients Diagnosed with Acute Myocardial Infraction

A myocardial infarction (MI), is the irreversible death (necrosis) of heart muscle commonly known as a heart attack. Acute myocardial infarction (AMI) occurs when blood flow decreases or stops to the coronary artery of the heart, causing damage to the heart muscle. MI is associated with an intelligible imbalance in oxidative stress. After myocardial injury, many cardiac biomarkers become detectable in venous circulation such as cardiac enzymes. The study's main goals were to evaluate the clinical significant change in cardiac enzymes and investigate the positive and negative correlation with some serum oxidative stress markers total oxidative state (TOS), free amine and total antioxidant capacity (TAC) in patient and control groups. This study contained 120 subjects who were divided evenly into patients and control groups for the period between July and September 2022. The serum levels of oxidative stress markers were measured manually using spectrophotometer (model, Cecil, CE10N / England). The activity of cardiac enzymes and lipid profile were also determined by using Spectrophotometric kits supplied from Biolabo, France. The study showed that TOS had a significantly positive correlation with CK (r = 0.269*, p= 0.038) and ALT (r = 0.259*, p= 0.046), also for free amine, TnI (r = 0.287*, p= 0.026). Moreover, cardiac Troponin had highly positive correlation with oxidants and enzymes of the cardiomyocyte.

Effectiveness of Structured Teaching Programme Regarding Immediate Management of Myocardial Infarction on Level of Knowledge Among Hypertensive Patients at Selected Tertiary Care Hospitals, Coimbatore

Myocardial infarction is the irreversible death of heart muscle secondary to prolonged lack of oxygen supply. Methods: The Pre experimental study was undertaken Knowledge regarding myocardial infarction was assessed among hypertensive patients. Purposive sampling technique was used and data was collected using demographic variables Performa & knowledge Questionnaire. The collected data was entered into Excel sheet and analysed. Results: The result of the study reveals that pre – test mean score of patients knowledge on immediate management of myocardial infarction was 4.8±2 and post – test mean score was 12.9±3.The mean difference score was 8.1. The calculated paired t-test value was t=18.23, was found to be statistically significant at P <0.05 level. Conclusion: The study concluded that there was significant improvement in the level of knowledge regarding myocardial infarction among hypertensive patients after intervention of structured teaching programme. Key words: Effectiveness, Knowledge, Myocardial infarction, Hypertensive patients, Structured teachingprogramme.

The Correlation of Oxidative Stress Markers and Biochemical Cardiac Enzymes in Iraqi Patients Diagnosed with Acute Myocardial Infraction

A myocardial infarction (MI), is the irreversible death (necrosis) of heart muscle commonly known as a heart attack. Acute myocardial infarction (AMI) occurs when blood flow decreases or stops to the coronary artery of the heart, causing damage to the heart muscle. MI is associated with an intelligible imbalance in oxidative stress. After myocardial injury, many cardiac biomarkers become detectable in venous circulation such as cardiac enzymes. The study's main goals were to evaluate the clinical significant change in cardiac enzymes and investigate the positive and negative correlation with some serum oxidative stress markers total oxidative state (TOS), free amine and total antioxidant capacity (TAC) in patient and control groups. This study contained 120 subjects who were divided evenly into patients and control groups for the period between July and September 2022. The serum levels of oxidative stress markers were measured manually using spectrophotometer (model, Cecil, CE10N / England). The activity of cardiac enzymes and lipid profile were also determined by using Spectrophotometric kits supplied from Biolabo, France. The study showed that TOS had a significantly positive correlation with CK (r = 0.269*, p= 0.038) and ALT (r = 0.259*, p= 0.046), also for free amine, TnI (r = 0.287*, p= 0.026). Moreover, cardiac Troponin had highly positive correlation with oxidants and enzymes of the cardiomyocyte.

Highly effective decontamination in a hospital environment: An easy-to-operate, low-cost prototype.

Healthcare-associated infections (HAI) are illnesses acquired during healthcare and are often the most important adverse event during healthcare. With the aim of increasing the effectiveness of disinfection/decontamination processes in the health service with safe and not promote microbial resistance, we propose the development of portable equipment associated with type C ultraviolet light (UVC). The efficiency of the irradiance emitted by the equipment (at dosages 3.5, 5.0, and 60 mJ/cm2) was determined by the action exerted after exposure against four different bacterial (Acinetobacter baumannii, Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus) and three different fungi (Candida albicans, C. parapsilosis, and Aspergillus section Fumigati). It was possible to observe that all treatments were capable of inactivating the bacterial species evaluated (p < 0.05), causing the irreversible death of these microorganisms. The most effective elimination of fungal agents was at a dose of 60 mJ/cm2 of UVC radiation, with a decrease in the fungal inoculum varying between 94% and 100% in relation to the control without exposure. Thus, our study showed that the application of the portable prototype with UVC light (254 nm) at a distance of 48 mm, allowed an average irradiance of 3.5 mW/cm2, with doses of 3.5 ≈ 60 mJ/cm2 (from 1 to 60 s of exposure), which can promote the total reduction of the bacteria evaluated and significantly reduce fungal growth. Therefore, this prototype could be used safely and effectively in the hospital environment, considerably reducing contamination and contributing to the reduction of healthcare-associated infection risk.

Stem cell exosomes in the pathophysiology of cardiovascular diseases

This study focused on the current state of the therapeutic potential of extracellular vesicles, which depends on the methods of their isolation and composition and the characteristics of the vesicular and nonvesicular components. Myocardial damage, particularly as a result of acute myocardial infarction, leads to irreversible death of cardiomyocytes and sarcomeres and ultimately to heart failure. The adult heart has limited regenerative capacity; therefore, stimulation of endogenous repair and regenerative potentials using cell therapy has potential. Moreover, the benefit from the injection of stem cells and progenitor cells into the damaged myocardium is mediated by the factors they secrete. In particular, exosomes, nanosized secreted extracellular vesicles of endosomal origin, have become key signaling organelles in intercellular communication and are currently considered key regenerative components of the secretome of stem and progenitor cells. Exosomes released from cardiac embryonic and mesenchymal stem cells, resident stem and progenitor cells (including a specific subgroup of cardiosphere cells), induced pluripotent stem cells, and cardiomyocytes isolated from these cells have cardioprotective, immunomodulatory, and reparative abilities. The use of exosomes in the targeted transport of drugs in lipid-like nanocontainers and extracellular vesicles is another promising area. Because artificial drug carriers, including liposomes and lipid-based nanoparticles, are limited by potential toxicity, immunogenicity, and inability to target specific organs, exosomes hold good promise as potential drug carriers. Compounds can be transported both inside exosomes and on their surface. Secreted extracellular vesicles, particularly exosomes, can be considered a key functional component of the secretome of stem cells and cardiogenic progenitor cells (mesenchymal stem cells, endogenous cardiac progenitor cells, cardiospheres, bone marrow embryonic stem cells, and bone marrow induced pluripotent stem cells). They have demonstrated therapeutic efficacy in preclinical models in the study of cardiovascular pathology.

Screening and evaluation of antioxidants for retinal pigment epithelial cell protection: L-ergothioneine as a novel therapeutic candidate through NRF2 activation

The continual exposure of retinal tissues to oxidative stress leads to discernible anatomical and physiological alterations. Specifically, the onslaught of oxidative damage escalates the irreversible death of retinal pigmented epithelium (RPE) cells, pinpointed as the fundamental pathological event in dry age-related macular degeneration (AMD). There is a conspicuous lack of effective therapeutic strategies to counteract this degenerative process. This study screened a library of antioxidants for their ability to protect RPE cells against oxidative stress and identified L-ergothioneine (EGT) as a potent cytoprotective agent. L-ergothioneine provided efficient protection against oxidative stress-damaged RPE and maintained cell redox homeostasis and normal physiological functions. It maintained the normal structure of the retina in mice under oxidative stress conditions. Transcriptomic analysis revealed that EGT counteracted major gene expression changes induced by oxidative stress. It upregulated antioxidant gene expression and inhibited NRF2 translocation. The inhibition of NRF2 abolished EGT's protective effects, suggesting that NRF2 activation contributes to its mechanism of action. In conclusion, we identified EGT as a safe and effective small-molecule compound that is expected to be a novel antioxidative agent for treating AMD.

Sphingolipid biosynthetic inhibitor L-Cycloserine prevents oxidative-stress-mediated death in an in vitro model of photoreceptor-derived 661W cells

Oxidative stress plays a pivotal role in the pathogenesis of several neurodegenerative diseases. Retinal degeneration causes irreversible death of photoreceptor cells, ultimately leading to vision loss. Under oxidative stress, the synthesis of bioactive sphingolipid ceramide increases, triggering apoptosis in photoreceptor cells and leading to their death. This study investigates the effect of L-Cycloserine, a small molecule inhibitor of ceramide biosynthesis, on sphingolipid metabolism and the protection of photoreceptor-derived 661W cells from oxidative stress. The results demonstrate that treatment with L-Cycloserine, an inhibitor of Serine palmitoyl transferase (SPT), markedly decreases bioactive ceramide and associated sphingolipids in 661W cells. A nontoxic dose of L-Cycloserine can provide substantial protection of 661W cells against H2O2-induced oxidative stress by reversing the increase in ceramide level observed under oxidative stress conditions. Analysis of various antioxidant, apoptotic and sphingolipid pathway genes and proteins also confirms the ability of L-Cycloserine to modulate these pathways. Our findings elucidate the generation of sphingolipid mediators of cell death in retinal cells under oxidative stress and the potential of L-Cycloserine as a therapeutic candidate for targeting ceramide-induced degenerative diseases by inhibiting SPT. The promising therapeutic prospect identified in our findings lays the groundwork for further validation in in-vivo and preclinical models of retinal degeneration.

Injectable MXene conductive hydrogel improves myocardial infarction through scavenging ROS and repairing myocardium electrical integrity

Myocardial infarction (MI) caused by ischemia and hypoxia microenvironment leads to irreversible death of cardiomyocytes, in which excessive oxidative stress plays a key role. Moreover, MI breaks the effective conduction of electrical signals in myocardial tissue, leading to cardiac systolic and diastolic dysfunction, and subsequently adverse ventricular remodeling. Therefore, scavenging reactive oxygen species (ROS) and repairing myocardium electrical integrity are two key issues in MI treatment. In this study, we embedded MXene nanosheets (Ti3C2) into temperature-sensitive extracellular matrix (ECM) hydrogels to prepare antioxidant/conductive hydrogels (E-MXene). E-MXene efficiently eliminated ROS in vitro, and improved calcium signaling synchronization of human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) because of remarkable antioxidant and conductivity properties. Meanwhile, the upregulation of Connexin43(Cx43) confirmed that MXenes enhanced electrical conduction between hiPSC-CMs. The injection of E-MXene in the MI region of mice soon after surgery was found to reduce ROS and cardiomyocyte apoptosis in the early stage of MI, as well as enhanced the electrical signal transmission in infarcted tissue during the late stage of MI. The cardiac function and structure were improved 28 days post-MI. Therefore, the E-MXene combined ROS scavenging with tissue electrical integrity improvement, thus providing theoretical bases and new ideas for the treatment of MI.

Dual-Fuel Propelled Nanomotors with Two-Stage Permeation for Deep Bacterial Infection in the Treatment of Pulpitis.

Bacterial infection-induced inflammatory response could cause irreversible death of pulp tissue in the absence of timely and effective therapy. Given that, the narrow structure of root canal limits the therapeutic effects of passive diffusion-drugs, considerable attention has been drawn to the development of nanomotors, which have high tissue penetration abilities but generally face the problem of insufficient fuel concentration. To address this drawback, dual-fuel propelled nanomotors (DPNMs) by encapsulating L-arginine (L-Arg), calcium peroxide (CaO2 ) in metal-organic framework is developed. Under pathological environment, L-Arg could release nitric oxide (NO) by reacting with reactive oxygen species (ROS) to provide the driving force for movement. Remarkably, the depleted ROS could be supplemented through the reaction between CaO2 with acids abundant in the inflammatory microenvironment. Owing to high diffusivity, NO achieves further tissue penetration based on the first-stage propulsion of nanomotors, thereby removing deep-seated bacterial infection. Results indicate that the nanomotors effectively eliminate bacterial infection based on antibacterial activity of NO, thereby blocking inflammatory response and oxidative damage, forming reparative dentine layer to avoid further exposure and infection. Thus, this work provides a propagable strategy to overcome fuel shortage and facilitates the therapy of deep lesions.

Legal thanatology and the right to death: problems and prospects for studying somatic human rights

The article examines the somatic rights of a person through the prism of «discourse of death». Emphasis is placed on the problems of legal thanatology as a science about death. Philosophical, religious and cultural differences in concepts and definition of human death. It is noted that an important component of medical thanatology is the concept of thanatogenesis – the causes and mechanisms of the onset of death, a set of interdependent pathological processes that lead to the onset of clinical or biological death. Knowledge of the basic patterns of thanatogenesis and detection of changes that trigger the process of thanatogenesis are necessary for timely and adequate correction of critical conditions that occur in patients. The time of death of a person is the moment of his brain death or his biological death (irreversible death of a person). Brain death can occur with complete and irreversible cessation of all its functions, which is registered with a working heart and artificial ventilation of the lungs. The methodology for diagnosing death is not related to the concept that there are different types of death. Loss of cardiovascular and respiratory function can lead to death only when ischemia and anoxia are prolonged enough to cause irreversible brain damage. Legal thanatology should be considered as an independent direction in modern jurisprudence within the framework of general theoretical jurisprudence. It is related to medical bioethics, medical law, and, from this point of view, it identifies the gaps that exist in jurisprudence and medicine and, if possible, eliminates them. Legal thanatology is a kind of «bridge» and «filter» of achievements in the field of medicine and legal science, which further helps law to «go hand in hand» with medicine. It was concluded that in the conditions of an increase in the number of donor centers, the extreme ethical importance of diagnosing brain death determines the need for high accuracy, speed and safety of its establishment. The above data show that the problem of brain death, as before, remains an open scientific problem. The concept of brain death continues to develop, refine, and improve. Any new circumstances (clinical observations, scientific facts) have to be tested again and again as arguments in defense of life or in defense of death. Key words: human rights, right to death, somatic rights, legal thanatology, death, human body, time of death, brain death.

CREG Protects Retinal Ganglion Cells loss and Retinal Function Impairment Against ischemia-reperfusion Injury in mice via Akt Signaling Pathway.

The irreversible death of retinal ganglion cells (RGCs) plays an important role in the pathogenesis of glaucoma. Cellular repressor of E1A-stimulated genes (CREG), a secreted glycoprotein involved in cellular proliferation and differentiation, has been shown to protect against myocardial and renal ischemia-reperfusion damage. However, the role of CREG in retinal ischemia-reperfusion injury (RIRI) remains unknown. In this study, we aimed to explore the effect of CREG on RGCs apoptosis after RIRI. We used male C57BL/6J mice to establish the RIRI model. Recombinant CREG was injected at 1day before RIRI. The expression and distribution of CREG were examined by immunofluorescence staining and western blotting. RGCs survival was assessed by immunofluorescence staining of flat-mounted retinas. Retinal apoptosis was measured by the staining of TdT-mediated dUTP nick-end labeling and cleaved caspase-3. Electroretinogram (ERG)analysis and optomotor response were conducted to evaluate retinal function and visual acuity. The expressions of Akt, phospho-Akt (p-Akt), Bax, and Bcl-2 were analyzed by western blotting to determine the signaling pathways of CREG. We found that CREG expression was decreased after RIRI, and intravitreal injection of CREG attenuated RGCs loss and retinal apoptosis. Besides, the amplitudes of a-wave, b-wave, and photopic negative response (PhNR) in ERG, as well as visual function, were significantly restored after treatment with CERG. Furthermore, intravitreal injection of CREG upregulated p-Akt and Bcl-2 expression and downregulated Bax expression. Our results demonstrated that CREG protected RGCs from RIRI and alleviated retinal apoptosis by activating Akt signaling. In addition, CREG also improved retinal function and visual acuity.

Some issues of legal regulation of transplantation of anatomical materials to humans

The Constitution of Ukraine established that a person, his life and health are recognized as the highest social value in our state. In addition, everyone is guaranteed the right to health care, medical assistance and health insurance. At the same time, the issue of researching the legal regime of various objects of civil legal relations, including anatomical materials, biological materials, donor organs, etc., in the conditions of updating the civil legislation of Ukraine and the intentions of recodification, taking into account their special importance, have acquired the special relevance.&#x0D; Transplantation is a special method of treatment, which consists in transplanting human anatomical material from a donor to a recipient and is aimed at restoring human health. Every adult with legal capacity has the right to give written (electronic) consent or non-consent to the removal of anatomical materials from his body for transplantation and/or the manufacture of bio-implants after the determination of his condition as irreversible death (brain death or biological death) in accordance with the law. The identity of the donor should not be known to the recipient, and the identity of the recipient to the donor's family, except when the recipient and the donor are married or are close relatives.&#x0D; By their legal nature, consent or non-consent to donation are acts. After all, it is legally established that they must be done in writing, in particular in electronic form, in the order determined by the Cabinet of Ministers of Ukraine. Such transactions are unilateral and are not subject to notarization, and there is no requirement to certify the authenticity of a person's signature by a notary public.&#x0D; In has been concluded in the article about the expediency during the recodification of the detailed regulation of the legal regime of anatomical materials, organs, biological materials, reproductive cells, etc., with mandatory consideration of the identified problems of law enforcement and modern progress.

The Problem with the Anthropocene: Kainos, Not Anthropos

The Problem with the Anthropocene: <i>Kainos</i>, Not <i>Anthropos</i>

Defect-Modified nano-BaTiO3 as a Sonosensitizer for Rapid and High-Efficiency Sonodynamic Sterilization.

Multidrug-resistant bacteria caused by the unlimited overuse of antibiotics pose a great challenge to global health. An antibacterial method based on reactive oxygen species (ROS) is one of the effective strategies without inducing bacterial resistance. Owing to the ability of generating ROS, piezocatalytic material-mediated sonodynamic therapy (SDT) has drawn much attention. However, its major challenge is the low ROS generation efficiency in the piezocatalytic process due to the poor charge carrier concentration of piezoelectric materials. Vacancy engineering can regulate the charge density and largely promote ROS generation under ultrasound (US) irradiation. Herein, a US-responsive self-doped barium titanate with controlled oxygen vacancy (Vo) concentrations was successfully synthesized through a facile thermal reduction treatment at different temperatures (i.e., 350, 400, and 450 °C), and the corresponding samples were named as BTO-350, BTO-400, and BTO-450, respectively. Then, the effect of Vo concentrations on ROS generation efficiency during the piezocatalytic process was systematically studied. And BTO-400 was found to possess the highest piezocatalytic activity and excellent sonodynamic antibacterial performance against Escherichia coli and Staphylococcus aureus. Furthermore, its antibacterial mechanism was confirmed that the ROS generated under US could damage bacterial cell membrane and cause considerable leakage of cytoplasmic components and irreversible death of bacteria. Notably, the in vivo results illustrated that the BTO-400 could serve as an effective antibacterial agent and accelerate skin healing via SDT therapy. In all, the Vo defect-modified nano-BaTiO3 has a noticeable potential to induce a rapid and efficient sterilization as well as skin tissue repair by SDT.

ПЕРСПЕКТИВЫ РЕТРАСНПЛАНТАЦИИ ПОЧКИ. КЛИНИЧЕСКИЙ СЛУЧАЙ

According to a number of large epidemiological studies, about 10% of the world's population suffer from chronic kidney disease (CKD), the most severe stage of which is end-stage chronic renal failure (ESRD). Chronic renal failure is a symptom complex that develops in chronic bilateral kidney diseases due to the gradual irreversible death of nephrons and is characterized by a violation of the homeostatic function of the kidneys. The disease is diagnosed in 10-13% of the adult population, and 20% of them are people over 60 years of age. In Russia, according to international studies, up to 27 million people suffer from chronic kidney disease. The task of conservative therapy is to slow down the progression of chronic renal failure, to eliminate factors that aggravate its course, as well as to correct hormonal and metabolic disorders inherent in uremia - anemia, hyperphosphatemia, hyperlipidemia. The fifth stage of chronic kidney disease, also called the stage of end-stage renal disease, means a decrease in kidney function by more than 80%, which leads to life-threatening disorders of homeostasis and metabolism. The only way to continue life at this stage is lifelong use of renal replacement therapy, which includes three varieties: hemodialysis, peritoneal dialysis and kidney transplantation. The aim of each type of this therapy is to replenish, as far as possible, the lost functions of the patient's kidneys. Recently, the quality and reliability of dialysis machines, water purification systems, vascular access has improved significantly. However, there are complications associated with the procedure. This is also facilitated by an increase in the number of patients with diabetes mellitus, cardiovascular pathology, who are most susceptible to interaction with a dialysis machine. If there is no possibility of a transplant, a long waiting list, or there are contraindications to surgery, dialysis therapy is the treatment of choice. It must be remembered that dialysis is also supportive therapy for transplant rejection.

Boosting ROS-Mediated Lysosomal Membrane Permeabilization for Cancer Ferroptosis Therapy.

Due to the deficient catalase, abundant reduced iron and low acidic environment in lysosomes, inducing lysosomal membrane permeabilization (LMP) through Fenton reaction-based reactive oxygen species (ROS) generation recently attracts increasing attention in cancer therapy. However, the lysosomal membranes are protected by highly glycosylated membrane proteins and several endolysosomal damage-response mechanisms can rapidly repair the injured lysosomes. To produce sufficient ROS and cause complete lysosomal membranes rupture, a lysosome-targeted ROS inducer, N-(3-Aminopropyl) morpholine grafted cross-linked lipoic acid vesicles with vitamin C-loading (VC@N3AM cLAVs), is developed. VC@N3AM cLAVs efficiently accumulate in lysosomes and convert into two redox couples LA/DHLA (dihydrolipoic acid, reduced form of LA) and VC/DHA (dehydroascorbic acid, oxidized form of VC) by the lysosomal glutathione, which can not only produce a large amount of H2 O2 by pro-oxidant action but also accelerate iron transformation through the cyclic redox reactions between each other and cause the efficient conversion of the generated H2 O2 into highly toxic •OH. Both in vitro and in vivo experiments demonstrate that VC@N3AM cLAVs can effectively enhance ROS production and boost LMP, finally initiation irreversible death of tumor cells via ferroptosis pathway, thus representing a potential anticancer drug for cancer therapy.

Wernicke encephalopathy after chronic pancreatitis exacerbation. Case report

Wernicke encephalopathy (WE), is an emergency acute neuropsychiatric condition, which develops secondary to thiamine deficiency. According to data of multiple investigations, this disorder is greatly underdiagnosed. WE classically connected to chronic alcohol abuse, but also diagnosed in non‑alcoholic patients with different risk factors including severe vomiting, chronic malnutrition, systemic infections, malignancies, chemotherapy, HIV/AIDS, gastrointestinal surgeries or disease, and renal problems.&#x0D; We present a case of a 33‑year‑old woman with history of chronic pancreatitis exacerbation with prolonged vomiting, present to the neurological department with neurological symptoms consistent with WE. WE was suspected according to triad of symptoms, such as altered mental state, oculomotor disturbances and ataxia. Brain magnetic resonance imaging (MRI) and thiamine blood level aid us to confirm WE diagnosis. The patient was given thiamine, at the dosage of 200 mg 3 times per day intravenously for seven days, followed by oral thiamine. Gaze paresis disappeared at day 10, truncal ataxia noticeably improved after two weeks. The patient was left with some signs of anterograde amnesia, gaze‑provoked nystagmus at the two month follow‑up.&#x0D; Physicians should be familiar with clinical presentation of WE in non‑alcoholic patients with appropriate history and risk factors, like prolonged emesis, unbalanced diet, malignancies, etc. Presence of classic triad of clinical symptoms and pathological findings on brain MRI are the most important diagnostic tool, while the blood thiamine level may be within the normal range. Early diagnosis and therapy onset are crucial for patients to prevent further irreversible complications or death.&#x0D;

Bifunctional 2D/2D g-C3N4/BiO2−x nanosheets heterojunction for bacterial disinfection mechanisms under visible and near-infrared light irradiation

The efficient deployment of visible and near-infrared (NIR) light for photocatalytic disinfection is of great concern a matter. Herein, we report a specific bifunctional 2D/2D g-C3N4/BiO2−x nanosheets heterojunction, prepared through a self-assembly approach. Delightfully, the obtained 2D/2D heterojunctions exhibited satisfactory photocatalytic disinfection performance towards Escherichia coli K-12 (E. coli K-12) under visible light irradiation, which was credited to the Z-scheme interfacial heterojunction facilitating the migration of photogenerated carries. The photoactivity enhancement driven by NIR light illumination was ascribed to the cooperative synergy effect of photothermal effect and “hot electrons”, engineering efficient charge transfer. Intriguingly, the carboxyl groups emerged on g-C3N4 nanosheets contributed a vital role in establishing the enhanced photocatalytic reaction. Moreover, the disinfection mechanism was systematically described. The cell membrane was destroyed, evidenced by the generation of lipid peroxidation reaction and loss of energy metabolism. Subsequently, the damage of defense enzymes and release of intracellular constituents announced the irreversible death of E. coli K-12. Interestingly enough, considerable microbial community shifts of surface water were observed after visible and NIR light exposure, highlighting the critical feature of disinfection process in shaping microbial communities. The authors believe that this work gives a fresh light on the feasibility of heterostructures-enabled disinfection processes.

Карбоксикриоабляция почки. Экспериментальное исследование

The aim of this experimental study was to evaluate the effect of low temperatures of carbon dioxide on a "living" blood-supplying organ (pig kidney), to determine the possibility of performing cryoablation of kidney tissue with carbon dioxide (carboxycryoablation), as well as to establish experimentally modes of carboxycryoablation of the kidney.To carry out this experimental study, a female of the mini-pig line was used. We performed laparoscopic access to the kidney for carboxycryoablation. During the freezing of the kidney, three modes were compared: 60, 90, and 120 s on one kidney of one animal. Immediately after the completion of cryoablation, nephrectomy was performed, and the removed kidney was sent for histological examination. According to the histological study, the results of the use of carbon dioxide during cryoablation of porcine kidney tissue were evaluated.Cryoablation based on carbon dioxide (carboxycryoablation) leads to irreversible death (necrosis) and destruction of the affected tissue. A direct relationship between the exposure mode and the size of the cryonecrosis zone was noted. Thus, the most extensive zone of necrosis with a diameter of 10 mm was achieved when performing cryoablation in the exposure mode of 120 s.This experiment showed that carbon dioxide-based cryoablation remains a feasible procedure that leads to irreversible death (necrosis) and destruction of the affected tissue. However, further studies on the safety and efficacy of cryoablation of kidney tissue with carbon dioxide are required.

Minimal Exposure Times for Irreversible Euthanasia with Carbon Dioxide in Mice and Rats.

When using an anesthetic overdose to euthanize laboratory rodents, a secondary method of euthanasia is recommended to ensure that the apparent death is irreversible. This secondary method usually is accomplished through the collection of tissues that are required to complete the research project. However, frequently laboratory rodents must be euthanized because they cannot be used for studies; in these cases, caretakers must perform a secondary method of euthanasia. Performing physical methods of euthanasia, even on unconscious rodents, can contribute to compassion fatigue in these persons. The current study was designed based on existing literature regarding minimal exposure times for preweanling rats and mice euthanized with carbon dioxide. The study evaluated the minimal time that adult rats and mice must remain in 100% carbon dioxide for death to be irreversible on removal. Adult rats (14 stocks and strains) and mice (more than 40 stocks and strains) were euthanized using a 50% volume per minute displacement rate of carbon dioxide for 2 min. The cages were then left undisturbed for predetermined times, ranging from 0 to almost 12 min. Upon removal from the cage, the animals were stimulated to determine whether they could be resuscitated. If an animal recovered, it was euthanized by using a physical method of euthanasia, and a duration that was 30 s longer than the previous predetermined time was assessed using other animals. The study demonstrated that exposure times of at least 3 min in carbon dioxide reliably result in irreversible euthanasia of mice but that exposure times of at least 10.5 min in carbon dioxide were required to ensure irreversible euthanasia of rats. Although an irreversible death can be attained with carbon dioxide, the use of appropriate species-specific exposure times is critical.