Oral parasitic protozoan Entamoeba gingivalis in periodontal disease patients, northeastern Thailand.

Entamoeba gingivalis is present in the oral cavity of humans and is associated with periodontal disease. Consequently, this study aimed to comprehensively investigate the E. gingivalis infection and the associated risk factors among individuals suffering from periodontal conditions. A cross-sectional descriptive study was carried out within a cohort of periodontal patients. Dental plaque specimens were meticulously collected and subsequently subjected to thorough examination using the polymerase chain reaction (PCR)-based technique targeting the small subunit ribosomal RNA (SrRNA) gene of the organism. The occurrence of risk factors for E. gingivalis infection was analyzed by the chi-square test and binary logistic regression. Out of the 230 participants, 60 were clinically diagnosed with periodontitis, while 170 were afflicted with gingivitis. Out of the 230 patients, 25 (10.9%) tested positive for E. gingivalis infections. An in-depth analysis unveiled that a significant majority of infections were recorded within subgroups characterized by a marital status (15.45%), manifestation of periodontitis (25.00%), and concomitant presence of underlying disease (20.83%). Furthermore, the high risk factor associated with E. gingivalis infection was the female (ORadj = 13.65, 95% CI = 1.08-173.21), followed by periodontitis (ORadj = 3.30, 95% CI = 1.21-9.00), respectively. The study employs a molecular diagnostic approach to screen for E. gingivalis enrichment within a subset of periodontal patients with advancing disease. The findings emphasize the necessity for further research to elucidate the pathogenesis of E. gingivalis and advocate for vigilant surveillance within a substantial population of periodontal patients.

Oral parasitic protozoan Entamoeba gingivalis in periodontal disease patients, northeastern Thailand

@#Entamoeba gingivalis is present in the oral cavity of humans and is associated with periodontal disease. Consequently, this study aimed to comprehensively investigate the E. gingivalis infection and the associated risk factors among individuals suffering from periodontal conditions. A cross-sectional descriptive study was carried out within a cohort of periodontal patients. Dental plaque specimens were meticulously collected and subsequently subjected to thorough examination using the polymerase chain reaction (PCR)-based technique targeting the small subunit ribosomal RNA (SrRNA) gene of the organism. The occurrence of risk factors for E. gingivalis infection was analyzed by the chi-square test and binary logistic regression. Out of the 230 participants, 60 were clinically diagnosed with periodontitis, while 170 were afflicted with gingivitis. Out of the 230 patients, 25 (10.9%) tested positive for E. gingivalis infections. An in-depth analysis unveiled that a significant majority of infections were recorded within subgroups characterized by a marital status (15.45%), manifestation of periodontitis (25.00%), and concomitant presence of underlying disease (20.83%). Furthermore, the high risk factor associated with E. gingivalis infection was the female (ORadj = 13.65, 95% CI = 1.08-173.21), followed by periodontitis (ORadj = 3.30, 95% CI = 1.21-9.00), respectively. The study employs a molecular diagnostic approach to screen for E. gingivalis enrichment within a subset of periodontal patients with advancing disease. The findings emphasize the necessity for further research to elucidate the pathogenesis of E. gingivalis and advocate for vigilant surveillance within a substantial population of periodontal patients.

Perceptions of general and postpresidential election discrimination are associated with loss of control eating among racially/ethnically diverse young men.

OBJECTIVE: The purpose of this study was to examine the association between young men's perceived experiences with discrimination, both general and following the 2016 presidential election, and their loss of control (LOC) eating. The degree to which men identified with their ethnic identity was evaluated as a moderator. METHOD: The sample included 798 men (18-30 years; M = 24.0 ± 3.6) who identified as African American (n = 261), Asian/Asian American (n = 266), or Hispanic/Latino (n = 271). Participants completed an online survey of items assessing demographic characteristics; perceived discrimination; perceptions of race-related discrimination following the 2016 U.S. presidential election; ethnic identity; and LOC eating. RESULTS: After adjusting for income, education, generational status and body mass index, perceived discrimination was positively associated with LOC eating frequency in African American and Hispanic/Latino men (ps < .01). Ethnic identity was inversely associated with LOC eating frequency in Hispanic/Latino men (p < .001). In Asian/Asian American men, perceived discrimination was only associated with more LOC eating among those with a low ethnic identity (p < .001). Higher levels of perceived discrimination following the presidential election were uniquely associated with more frequent LOC eating (p < .01) only among Asian/Asian American men who were not born in the United States or whose parents were not born in the United States. DISCUSSION: LOC eating may partially explain known associations between discrimination and heightened risk for obesity and chronic diseases among African American and Hispanic/Latino men. Asian/Asian American men's LOC eating may be linked to postpresidential election and general experiences with racial discrimination, particularly if they report a low sense of belonging to their ethnic group.

A Comparison of Two Models of Risky Sexual Behavior During Late Adolescence.

Two models of risky sexual behavior (RSB) were compared in a community sample of late adolescents (N = 223). For the traumagenic model, early negative sexual experiences were posited to lead to an association between negative affect with sexual relationships. For the cognitive escape model, depressive affect was posited to lead to engagement in RSB as a way to avoid negative emotions. The current study examined whether depression explained the relationship between sexual trauma and RSB, supporting the cognitive escape model, or whether it was sexual trauma that led specifically to RSB, supporting the traumagenic model. Physical trauma experiences were also examined to disentangle the effects of sexual trauma compared to other emotionally distressing events. The study examined whether the results would be moderated by participant sex. For males, support was found for the cognitive escape model but not the traumagenic model. Among males, physical trauma and depression predicted engagement in RSB but sexual trauma did not. For females, support was found for the traumagenic and cognitive escape model. Among females, depression and sexual trauma both uniquely predicted RSB. There was an additional suppressor effect of socioeconomic status in predicting RSB among females. Results suggest that the association of trauma type with RSB depends on participant sex. Implications of the current study for RSB prevention efforts are discussed.

Use of coercive sexual tactics across 10 years in at-risk young men: developmental patterns and co-occurring problematic dating behaviors.

Men's use of two coercive sexual tactics was tracked over 10 years in a sample of at-risk young men (N = 201). Patterns were identified for each tactic. For the tactic using drugs or alcohol to go further sexually, non-coercers (63%) and coercers (37%) were identified. For the tactic of going further sexually after the woman said "no," three patterns were identified-noncoercers (10%), low-level coercers who used the tactic five times or less over 10 years (42%), and high level coercers who used the tactic more than five times over 10 years (48%). The associations between coercive tactics and two dating behaviors-physical aggression toward a partner and risky sexual behaviors-were examined using multilevel linear modeling. For both coercive tactics, main effects and interaction effects with time occurred for physical aggression toward a partner. The most coercive men perpetrated the most physical aggression toward a partner between ages 18 and 22 years, but sexual coercion was unrelated to partner abuse between ages 22 and 27 years. Results suggest men vary in their use of coercive sexual tactics over time and the frequency of coercion varies based on tactic. Preliminary evidence suggests the use of coercive sexual tactics is associated with physical aggression toward a partner but not risky sexual behaviors, though the strength of the association varies over time.

Culture and Personality Among European American and Asian American Men.

Personality differences between Asian American (N = 320) and European American men (N = 242) and also among Asian American ethnic groups (Korean, Chinese, Japanese, Filipino, and mixed Asian) are examined on the Big Five personality dimension. Personality structures for Asian Americans and European Americans closely replicate established norms. However, congruence is greater for European American and highly acculturated Asian American men than for low acculturated Asian American men. Similar patterns are found for the construct loss of face (LOF). Asian American men with a high concern for LOF are less similar in their personality structure to European American men than Asian American men with low LOF concern. Mean differences are also found among Asian American and European American men, who differ significantly on Extraversion, Conscientiousness, Openness, and Neuroticism. Results indicate that acculturation and LOF are significantly associated with these four personality dimensions for both Asian American and European American men.

Chromatin behaviour during the mitotic cell cycle of Saccharomyces cerevisiae.

Chromatin behaviour during the cell division cycle of the yeast Saccharomyces cerevisiae has been investigated in cells which have been depleted of 90% of their RNA by digestion with ribonuclease. Removal of large amounts of RNA from the yeast nucleus before treatment of the cells with heavy metal fixatives and stains permits chromatin to be visualized with extreme clarity in thin sections of cells processed for electron microscopy by conventional procedures. Spindle pole bodies were also visualized by this treatment, although the associated microtubules were not. Chromatin is dispersed during interphase and occupies the non-nucleolar region of the nucleus which is known to be Feulgen-positive from light microscopy. Because spindle microtubules are not visualized, direct attachment of microtubules to chromatin fibrils could not be verified. However, chromatin was not attached directly to the spindle pole bodies and kinetochore differentiations were not observed in the nucleoplasm. During nuclear division chromatin remains dispersed and does not condense into discrete chromatids. As the nucleus expands into the bud, chromosomal distribution to the daughter cells is thought to result from the separation of the poles of the spindle apparatus with attached chromatin fibrils. However, that such distribution is occurring as the nucleus elongates is not obvious until an advanced stage of nuclear division is reached and partition of the nucleus is nearly complete. Thus, no aggregation of chromatin into metaphase or anaphase plates occurs and the appearance of chromatin during mitosis is essentially the same as in interphase. These observations indicate that the marked changes in the topological structure of chromatin which characterize mitosis in the higher eukaryotes do not occur in S. cerevisiae.

Fractionation of Saccharomyces cerevisiae cell populations by centrifugal elutriation.

An exponential population of Saccharomyces cerevisiae cells was fractionated by centrifugal elutriation, using water as the elutriating liquid. Evidence that the population had been fractionated according to age in the cell cycle was obtained by examining the fractions for their size distribution, their microscopic appearance after Giemsa staining, and their ability to initiate synchronous growth.

Electron microscopy of an oligomeric protein stabilized by polyfunctional cross-linking.

Oligomeric proteins can be intramolecularly cross-linked with polylysine in a reaction in which a water soluble carbodiimide mediates an amide linkage between the protein carboxyl groups and the epsilon-amino groups of polylysine. Studies carried out with a cytochrome p-450 indicate that a small number of molecules in a population which has been cross-linked in this way retain important features of their tertiary and quaternary structure when negatively stained and examined in the electron microscope. Use of the method in determining the subunit geometry of oligomeric proteins is discussed.

Circular deoxyribonucleic acid from Shigella dysenteriae Y6R.

Circular deoxyribonucleic acid was isolated from Shigella dysenteriae Y6R and was found to consist of six species having molecular weights of 10(6), 1.3 x 10(6), 2.6 x 10(6), 3.8 x 10(6), 20 x 10(6), and 24 x 10(6) daltons. These size classes were partially resolved by sucrose density gradient centrifugation. The minicircles (10(6) and 1.3 x 10(6)) were found to have a buoyant density in CsCl of 1.710 g/ml. The 3.8 x 10(6) dalton class had a density of 1.707 g/ml. The two largest species had a density of 1.702 g/ml. Two other strains, S. sonnei II and S. dysenteriae 60, also contained circular deoxyribonucleic acid.

Penicillinase plasmid DNA from Staphylococcus aureus.

A penicillinase plasmid from Staphylococcus aureus and three of its derivatives, all previously identified as extrachromosomal genetic elements, have been isolated in high yield as circular duplex DNA molecules. The wild-type plasmid was found by contour-length measurements of electron micrographs to have a molecular weight of 18.6 x 10(6) daltons. Two plasmids with deletions encompassing six and eight of the eleven known plasmid cistrons had molecular weights of 16.4 x 10(6) and 15.3 x 10(6) daltons, respectively. This information was used to establish approximate physical distances for the genetic map. A high-frequency transducing element also derived from the plasmid had a molecular weight of approximately 24 x 10(6) daltons. Although each plasmid preparation appeared homogeneous by ultracentrifugal analysis, electron micrographs always revealed the presence of a low percentage of complex oligomeric forms, particularly circular and catenated dimers.