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Microbes and Environments 2023The umbilicus accumulates more dirt than other body surfaces and is difficult to clean. Hygiene in this area is vital, particularly for surgery, because of its proximity...
The umbilicus accumulates more dirt than other body surfaces and is difficult to clean. Hygiene in this area is vital, particularly for surgery, because of its proximity to the laparotomy site. Although microorganisms in the umbilicus have been extensively examined, those in umbilical dirt have not due to the lack of an efficient method of collection. We previously established a technique to extract umbilical dirt using the anchor effect of polymers, which are injected into the umbilicus. In the present study, we applied this technique for the first time to investigate umbilical dirt. The results obtained revealed an abundance of Corynebacterium among various bacteria, whereas Cutibacterium and Staphylococcus, which are abundant at other skin sites, were rare. The relationships between the microbiota and issues related to the umbilicus were investigated and some covariates, including the odor score and several bacteria, were identified. A detailed ana-lysis of the genera associated with odor revealed no correlation with Corynebacterium; however, some minor anaerobic bacteria, such as Mobiluncus, Arcanobacterium, and Peptoniphilus, were more abundant in the high odor score group. Therefore, this technique to collect umbilical dirt provided insights into the microbiota in umbilical dirt and suggested functions for minor anaerobes. Furthermore, since various pathogenic microorganisms were detected, their control may contribute to the prevention of both odor production and infectious diseases caused by these microorganisms.
Topics: Umbilicus; Odorants; Microbiota; Bacteria; Bacteria, Anaerobic; RNA, Ribosomal, 16S
PubMed: 37407492
DOI: 10.1264/jsme2.ME23007 -
Acta Endocrinologica (Bucharest,... 2021Sodium-glucose co-transporter 2 inhibitors (SGLT2-I) are a new class of oral antidiabetic drugs.
CONTEXT
Sodium-glucose co-transporter 2 inhibitors (SGLT2-I) are a new class of oral antidiabetic drugs.
OBJECTIVE
Side effects of drugs are frequently encountered with increasing use in clinical practice.
DESIGN/SUBJECTS AND METHODS
We present a case with an unidentified body odor that has not been described yet in the literature as an adverse effect of SGLT2-I.
RESULTS
A 49-year-old female patient with Type 2 DM was applied to our clinic for routine control. She had been receiving sitagliptin/metformin 50/1000 mg b.i.d. Her fasting plasma glucose was 160 mg/dL and HbA1c was 8%. Empagliflozin 10 mg/day was added to therapy. The patient noticed that two weeks after starting empagliflozin treatment, she began to smell herself and felt a bad/foul odor was released from her body. The patient associated these complaints with the new drug(empagliflozin) stopped two weeks ago. She also stated that all these complaints had disappeared one week after stopping the medication and there were no complaints at the moment.
CONCLUSIONS
Here we report an unidentified body odor as a potential empagliflozin-associated adverse event. There was a close temporal relationship between empagliflozin intake and the development and the occurrence of the described odor.
PubMed: 35747857
DOI: 10.4183/aeb.2021.554 -
Animal Cognition Jan 2023The extension of cognition beyond the brain to the body and beyond the body to the environment is an area of debate in philosophy and the cognitive sciences. Yet, these... (Review)
Review
The extension of cognition beyond the brain to the body and beyond the body to the environment is an area of debate in philosophy and the cognitive sciences. Yet, these debates largely overlook olfaction, a sensory modality used by most animals. Here, I use the philosopher's framework to explore the implications of embodiment for olfactory cognition. The philosopher's 4E framework comprises embodied cognition, emerging from a nervous system characterized by its interactions with its body. The necessity of action for perception adds enacted cognition. Cognition is further embedded in the sensory inputs of the individual and is extended beyond the individual to information stored in its physical and social environments. Further, embodiment must fulfill the criterion of mutual manipulability, where an agent's cognitive state is involved in continual, reciprocal influences with its environment. Cognition cannot be understood divorced from evolutionary history, however, and I propose adding evolved, as a fifth term to the 4E framework. We must, therefore, begin at the beginning, with chemosensation, a sensory modality that underlies purposive behavior, from bacteria to humans. The PROUST hypothesis (perceiving and reconstructing odor utility in space and time) describers how olfaction, this ancient scaffold and common denominator of animal cognition, fulfills the criteria of embodied cognition. Olfactory cognition, with its near universal taxonomic distribution as well as the near absence of conscious representation in humans, may offer us the best sensorimotor system for the study of embodiment.
Topics: Humans; Animals; Smell; Cognition; Brain; Odorants
PubMed: 36542172
DOI: 10.1007/s10071-022-01734-1 -
Journal of Radiation Research Sep 2022Light flash and odor during radiotherapy are well-known phenomena. Two prospective observational studies have indicated that 55% of patients observed a light flash... (Observational Study)
Observational Study
Light flash and odor during radiotherapy are well-known phenomena. Two prospective observational studies have indicated that 55% of patients observed a light flash during irradiation of the retina and 27% of patients sensed an odor during radiotherapy for the nasal cavity. A prospective observational study was performed in all patients at our hospital who received total body irradiation (TBI) between January 2019 to October 2021. Light flash and odor during TBI were examined using the same method as that used in previous studies. A total of 32 patients received TBI during the study period. The patients had a median age of 41 (18-60) years, and included 20 males and 12 females. A survey checklist showed that 14 patients (44%) sensed light and 14 patients (44%) sensed odor during TBI,. The color of the light during irradiation was yellow in six cases, white in four cases, and blue in four cases. The intensity of the light was 2-5 (median 3, 1 is very weak, 5 is very strong) and the time over which the light flash was felt was 4-60 s (median 10 s). Two patients each sensed smells of plastic, ozone and bleach, and others sensed one smell each. The intensity of the odor was 1-4 (median 3, 1 is very weak, 5 is very strong) and the time over which the odor was sensed was 1-25 s (median 3 s). We conclude that light flashes and odors are each sensed by 44% of patients during TBI. Various types of light flashes and odors were reported in this study.
Topics: Adult; Female; Humans; Male; Middle Aged; Odorants; Ozone; Plastics; Smell; Whole-Body Irradiation
PubMed: 35818297
DOI: 10.1093/jrr/rrac042 -
Hormone Research in Paediatrics 2015Adrenarche refers to a maturational increase in the secretion of adrenal androgen precursors, mainly dehydroepiandrosterone (DHEA) and its sulfate (DHEAS). In premature... (Review)
Review
Adrenarche refers to a maturational increase in the secretion of adrenal androgen precursors, mainly dehydroepiandrosterone (DHEA) and its sulfate (DHEAS). In premature adrenarche (PA), clinical signs of androgen action appear before the age of 8/9 years in girls/boys, concurrently with the circulating DHEA(S) concentrations above the usually low prepubertal level. The most pronounced sign of PA is the appearance of pubic/axillary hair, but also other signs of androgen effect (adult type body odor, acne/comedones, greasy hair, accelerated statural growth) are important to recognize. PA children are often overweight and taller than their peers, and the higher prevalence of PA in girls than in boys is probably explained by higher female adiposity and peripheral DHEA(S) conversion to active androgens. PA diagnosis requires exclusion of other causes of androgen excess: congenital adrenal hyperplasia, androgen-producing tumors, precocious puberty, and exogenous source of androgens. PA has been linked with unfavorable metabolic features including hyperinsulinism, dyslipidemia, and later-appearing ovarian hyperandrogenism. Although this common condition is usually benign, PA children with additional risk factors including obesity should be followed up, with the focus on weight and lifestyle. Long-term follow-up studies are warranted to clarify if the metabolic changes detected in PA children persist until adulthood.
Topics: Adrenal Glands; Adrenarche; Female; Humans; Hyperandrogenism; Male
PubMed: 25676474
DOI: 10.1159/000369458 -
Scientific Reports May 2021The skin microbiome, especially the axillary microbiome, consists of odor-causing bacteria that decompose odorless sweat into malodor compounds, which contributes to the...
The skin microbiome, especially the axillary microbiome, consists of odor-causing bacteria that decompose odorless sweat into malodor compounds, which contributes to the formation of body odor. Plant-derived products are a cheap source of bioactive compounds that are common ingredients in cosmetics. Microbial bioconversion of natural products is an ecofriendly and economical method for production of new or improved biologically active compounds. Therefore, in this study, we tested the potential of a Lactobacillus acidophilus KNU-02-mediated bioconverted product (BLC) of Lotus corniculatus seed to reduce axillary malodor and its effect on the associated axillary microbiota. A chemical profile analysis revealed that benzoic acid was the most abundant chemical compound in BLC, which increased following bioconversion. Moreover, BLC treatment was found to reduce the intensity of axillary malodor. We tested the axillary microbiome of 18 study participants, divided equally into BLC and placebo groups, and revealed through 16S rRNA gene sequencing that Staphylococcus, Corynebacterium, and Anaerococcus were the dominant taxa, and some of these taxa were significantly associated with axillary malodor. After one week of BLC treatment, the abundance of Corynebacterium and Anaerococcus, which are associated with well-known odor-related genes that produce volatile fatty acids, had significantly reduced. Likewise, the identified odor-related genes decreased after the application of BLC. BLC treatment enhanced the richness and network density of the axillary microbial community. The placebo group, on the other hand, showed no difference in the microbial richness, odor associated taxa, and predicted functional genes after a week. The results demonstrated that BLC has the potential to reduce the axillary malodor and the associated odor-causing bacteria, which makes BLC a viable deodorant material in cosmetic products.
Topics: Axilla; Female; Humans; Lotus; Metagenomics; Microbiota; Odorants; Phytochemicals; Plant Extracts; Seeds; Skin
PubMed: 33980951
DOI: 10.1038/s41598-021-89606-5 -
Frontiers in Behavioral Neuroscience 2022In mammals, odor information detected in the olfactory epithelium is converted to a topographic map of activated glomeruli in the olfactory bulb. Odor signals are then... (Review)
Review
In mammals, odor information detected in the olfactory epithelium is converted to a topographic map of activated glomeruli in the olfactory bulb. Odor signals are then conveyed by projection neurons to the olfactory cortex for decision making. Odor information is processed by two distinct pathways, one is innate and the other is learned, which are separately activated during exhalation and inhalation, respectively. There are two types of odor signals, exteroceptive and interoceptive, which are also processed in different phases of respiration. Exteroceptive sensory information whether attractive/pleasant or aversive/stressful, is evaluated by the valence regions in the amygdala. Stress is an alert signal telling the body to take an action so that the normal condition can be recovered. When the odor quality is negative, the brain sets up a behavioral strategy to avoid the danger or to improve the situation. In this review article, we will describe the recent progress in the study of olfactory perception focusing on stress responses to external and internal odors.
PubMed: 35783233
DOI: 10.3389/fnbeh.2022.943647 -
ENeuro 2018Sampling regulates stimulus intensity and temporal dynamics at the sense organ. Despite variations in sampling behavior, animals must make veridical perceptual judgments...
Sampling regulates stimulus intensity and temporal dynamics at the sense organ. Despite variations in sampling behavior, animals must make veridical perceptual judgments about external stimuli. In olfaction, odor sampling varies with respiration, which influences neural responses at the olfactory periphery. Nevertheless, rats were able to perform fine odor intensity judgments despite variations in sniff kinetics. To identify the features of neural activity supporting stable intensity perception, in awake mice we measured responses of mitral/tufted (MT) cells to different odors and concentrations across a range of sniff frequencies. Amplitude and latency of the MT cells' responses vary with sniff duration. A fluid dynamics (FD) model based on odor concentration kinetics in the intranasal cavity can account for this variability. Eliminating sniff waveform dependence of MT cell responses using the FD model allows for significantly better decoding of concentration. This suggests potential schemes for sniff waveform invariant odor concentration coding.
Topics: Action Potentials; Animals; Body Weight; Conditioning, Psychological; Drinking; Electrophysiology; Male; Mice; Mice, Inbred C57BL; Mice, Transgenic; Models, Neurological; Odorants; Olfactory Bulb; Olfactory Pathways; Rats; Rats, Long-Evans; Reaction Time; Reward; Sensory Receptor Cells; Smell
PubMed: 30627641
DOI: 10.1523/ENEURO.0149-18.2018 -
Depression and Anxiety Jun 2010The published literature on olfactory reference syndrome (ORS) spans more than a century and provides consistent descriptions of its clinical features. The core symptom... (Review)
Review
The published literature on olfactory reference syndrome (ORS) spans more than a century and provides consistent descriptions of its clinical features. The core symptom is preoccupation with the belief that one emits a foul or offensive body odor, which is not perceived by others. This syndrome is associated with substantial distress and disability. DSM-IV and ICD-10 do not explicitly mention ORS, but note convictions about emitting a foul body odor in their description of delusional disorder, somatic type. However, the fact that such symptoms can be nondelusional poses a diagnostic conundrum. Indeed, DSM-IV also mentions fears about the offensiveness of one's body odor in the social phobia text (as a symptom of taijin kyofusho). There also seems to be phenomenological overlap with body dysmorphic disorder, obsessive-compulsive disorder, and hypochondriasis. This article provides a focused review of the literature to address issues for DSM-V, including whether ORS should continue to be mentioned as an example of another disorder or should be included as a separate diagnosis. We present a number of options and preliminary recommendations for consideration for DSM-V. Because research is still very limited, it is unclear how ORS should best be classified. Nonetheless, classifying ORS as a type of delusional disorder seems problematic. Given this syndrome's consistent clinical description across cultures for more than a century, substantial morbidity and a small but growing research literature, we make the preliminary recommendation that ORS be included in DSM-Vs Appendix of Criteria Sets Provided for Further Study, and we suggest diagnostic criteria.
Topics: Depressive Disorder; Diagnostic and Statistical Manual of Mental Disorders; Humans; Odorants; Olfaction Disorders; Syndrome; Terminology as Topic
PubMed: 20533369
DOI: 10.1002/da.20688 -
The Journal of Nutrition, Health & Aging 2022Dementia can lead to decreased appetite and nutritional intake. Food odor exposure has been shown to increase appetite and nutritional intake in young healthy adults.... (Clinical Trial)
Clinical Trial
OBJECTIVES
Dementia can lead to decreased appetite and nutritional intake. Food odor exposure has been shown to increase appetite and nutritional intake in young healthy adults. This study investigates the effect of food odor exposure on appetite, nutritional intake and body weight of Dutch nursing home residents with dementia.
DESIGN
This was a one-armed, non-randomized, non-blinded intervention study consisting of a four-week control period followed by a twelve-week intervention period.
SETTING
Four nursing homes in the Netherlands.
PARTICIPANTS
Forty-five nursing home residents with dementia.
INTERVENTION
During the intervention period, odors were dispersed prior to the main meals.
MEASUREMENTS
General and specific appetite for sweet and savory foods was measured weekly. Nutritional intake was measured once during the control period and three times during the intervention period through a 3-day food record. Body weight was assessed at the start and end of the control period and at the start, end and halfway the intervention period. Data were analyzed with linear mixed models.
RESULTS
Small changes in general and specific appetite were observed after odor exposure. Overall energy intake did not change during the first four intervention weeks, but increased during the second and third (+118kcal/d, p=0.003 and +122kcal/d, p=0.004). Protein intake and body weight did not significantly change during the study.
CONCLUSION
In this study, no clinically relevant changes in appetite, nutritional intake and body weight were observed after food odor exposure. Future studies should assess the effect of natural food odors and/or meal-tailored odors on nutritional intake of older adults with dementia.
Topics: Aged; Appetite; Dementia; Eating; Energy Intake; Humans; Odorants
PubMed: 35166301
DOI: 10.1007/s12603-021-1719-y