ПОРУШЕННЯ ВСМОКТУВАННЯ ТА НЕПЕРЕНОСИМОСТІ ЛАКТОЗИ: ПАТОГЕНЕЗ, ДІАГНОСТИКА ТА ЛІКУВАННЯ

The problem of lactose metabolism remains relevant from the standpoint of various areas of medical research. Clinicians, anthropologists, physiologists and geneticists are engaged in the study of lactose digestion devices and various types of disorders associated with it, including lactose intolerance.Determination of such mechanisms allows us to understand not only the nutritional causes of the development of functional intestinal symptoms, but also the evolution of man and nutrition, culture and lifestyle. Symptoms of lactose intolerance are abdominal pain, flatulence, nausea, bloating, and diarrhea after drinking milk or dairy products. These symptoms may be caused by malabsorption of lactose, which is the result of low levels of lactase in the small intestine. Symptoms also occur after consumption of lactose or lactose products, with no apparent effect on the human microbiota and overall health. Therefore, of particular concern are the strict dairy-free diets commonly prescribed for patients with such complaints.This article discusses modern recommendations for the diagnosis and treatment of lactose malabsorption and lactose intolerance, which largely comply with European recommendations.The problem of lactose metabolism remains relevant from the standpoint of various areas of medical research. Clinicians, anthropologists, physiologists and geneticists are engaged in the study of lactose digestion devices and various types of disorders associated with it, including lactose intolerance.Determination of such mechanisms allows us to understand not only the nutritional causes of the development of functional intestinal symptoms, but also the evolution of man and nutrition, culture and lifestyle. Symptoms of lactose intolerance are abdominal pain, flatulence, nausea, bloating, and diarrhea after drinking milk or dairy products. These symptoms may be caused by malabsorption of lactose, which is the result of low levels of lactase in the small intestine. Symptoms also occur after consumption of lactose or lactose products, with no apparent effect on the human microbiota and overall health. Therefore, of particular concern are the strict dairy-free diets commonly prescribed for patients with such complaints.This article discusses modern recommendations for the diagnosis and treatment of lactose malabsorption and lactose intolerance, which largely comply with European recommendations

Malabsorption and Lactose Intolerance: Pathophysiology, Diagnosis and Treatment of Pathogenesis

The problem of lactose metabolism remains relevant from the standpoint of various areas of medical research. Clinicians, anthropologists, physiologists and geneticists are engaged in the study of lactose digestion devices and various types of disorders associated with it, including lactose intolerance.Determination of such mechanisms allows us to understand not only the nutritional causes of the development of functional intestinal symptoms, but also the evolution of man and nutrition, culture and lifestyle. Symptoms of lactose intolerance are abdominal pain, flatulence, nausea, bloating, and diarrhea after drinking milk or dairy products. These symptoms may be caused by malabsorption of lactose, which is the result of low levels of lactase in the small intestine. Symptoms also occur after consumption of lactose or lactose products, with no apparent effect on the human microbiota and overall health. Therefore, of particular concern are the strict dairy-free diets commonly prescribed for patients with such complaints.This article discusses modern recommendations for the diagnosis and treatment of lactose malabsorption and lactose intolerance, which largely comply with European recommendations

Single-Crystal Permanent Magnets: Extraordinary Magnetic Behavior in the Ta-,Cu-, and Fe-Substituted CeCo 5 Systems

To reduce material and processing costs of commercial permanent magnets and to attempt to fill the empty niche of energy products, 10–20 MGOe, between low-flux (ferrites, alnico) and high-flux (Nd2Fe14B- and SmCo5-type) magnets, we report the synthesis, structure, magnetic properties, and modeling of Ta-, Cu-, and Fe-substituted CeCo5. Using a self-flux technique, we grow single crystals of Ce15.1Ta1.0Co74.4Cu9.5, Ce16.3Ta0.6Co68.9Cu14.2, Ce15.7Ta0.6Co67.8Cu15.9, Ce16.3Ta0.3Co61.7Cu21.7, and Ce14.3Ta1.0Co62.0Fe12.3Cu10.4. X-ray-diffraction analysis shows that these materials retain a CaCu5 substructure and incorporate small amounts of Ta in the form of “dumbbells,” filling the 2e crystallographic sites within the one-dimensional hexagonal channel with the 1a Ce site, whereas Co, Cu, and Fe are statistically distributed among the 2c and 3g crystallographic sites. Scanning-electron-microscopy, energy-dispersive-x-ray-spectroscopy, and scanning-transmission-electron-microscopy examinations provide strong evidence of the single-phase nature of the as-grown crystals, even though they readily exhibit significant magnetic coercivities of approximately 1.6 kOe to approximately 1.8 kOe caused by Co-enriched, nanosized structural defects and faults that can serve as pinning sites. Heat treatments at 1040∘C for 10 h and hardening at 400∘Cfor 4 h lead to the formation of a so-called composite crystal with a bimodal microstructure that consists of a Ta-poor matrix and Ta-rich laminal precipitates. Formation of the composite crystal during the heat treatment creates a three-dimensional array of extended defects within a primarily single-grain single crystal, which greatly improves its magnetic characteristics. Possible causes for the formation of the composite crystal may be associated with Ta atoms leaving matrix interstices at lower temperatures and/or matrix degradation induced by decreased miscibility at lower temperatures. Fe strongly increases both the Curie temperature and magnetization of the system resulting, in (BH)max≈13MGOe at room temperature.</p