[Black tartar deposits (black spot--black stain) in light of the most recent literature].
Explore the source record for details and available documents.
Child↗
SEARCH · Search PubMed
Results for “Blacks”
Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Role of Chemically Modified Carbon Black Surfaces in Enhancing Interfacial Adhesion between Carbon Black and Rubber in a Composite System.
The surface and adsorption characteristics of carbon blacks treated with H(3)PO(4), KOH, and C(6)H(6) were investigated. The equilibrium spreading pressure (pi(e)), surface energy (gamma(s)), and specific surface area (S(BET)) were studied by the BET method with N(2) adsorption. In this work, an interpretation based on the nitrogen amount adsorbed for filling a monolayer (a(0)) was proposed for the determination of the Gibbs free energy of nitrogen adsorption, allowing evaluation of the equilibrium spreading pressure or London dispersive component of the surface free energy of the carbon blacks studied. Also, the microstructures of the carbon blacks treated were investigated by transmission electron microscopy. Acidic treatment led to significant decreases in adsorption amount, S(BET), and surface free energy of the carbon blacks, due to aggregation of the microstructures and increasing weight of the swollen specimen in an equilibrium state. Polar basic and nonpolar chemical treatments resulted in an increase of the equilibrium spreading pressure or London dispersive component of surface free energy of the carbon blacks without significantly changing the surface and adsorption properties and microstructures. Results from the surface energetics and parameter of polymer-filler interaction (chi) showed that the tearing energy of the composites is greatly dependent on the carbon blacks studied in the treatment. Copyright 2000 Academic Press.
Journal Article↗
[Stability and antioxidant activity of black currant and black aronia berry juices].
The berries of black currant and black aronia are rich in polyphenolic compounds and especially in anthocyanins, demonstrating antioxidant activity. The aim of the study was to evaluate the possible effect of thermal technological processes on the quantity of polyphenols and anthocyanins in berry juice concentrates, and on the antioxidant activity. After 8 hour storage of black currant and black aronia berry juice concentrates at 60 degrees C, the amount of polyphenols decreased by 46% and 22%, anthocyanins 31% and 35%, respectively. Antioxidant activity decreased by 26% and 56%, respectively. The results demonstrated insufficient stability of juice concentrates, and impropriety of application of long lasting drying processes in manufacturing of black currant and black aronia berry dry products. Fast and efficient drying methods for liquid products should be applied to preserve qualitative and quantitative composition and their antioxidant activity.
Anthocyanins↗
Black identity in biracial black/white people: a comparison of Jacqueline who refuses to be exclusively black and Adolphus who wishes he were.
Two biracial college freshmen, both of whom identify as Black, were chosen from a larger sample of participants in a qualitative study of biracial identity development to exemplify the differences in the paths that 2 biracial individuals could take to achieve racial identity resolution. Through the case study method, the authors describe the course and progression of racial identity development (RID) in these 2 individuals and discuss some key themes in their lives that have contributed to the development of their RID. The purposes are fourfold: to describe nonclinical subjective experiences of being biracial in the United States, to explore the differences in the paths that 2 biracial individuals can take to achieve what looks superficially like similar Black racial identity resolution, to demonstrate how identifying as Black can have different meanings and consequences for 2 biracial people, and to contribute to the differentiation of Black RID from biracial Black/White RID. The authors raise questions about the generalizability of monoracial Black and ethnic identity theories to biracial individuals.
Adolescent↗
Lung cancer mortality and carbon black exposure: a nested case-control study at a German carbon black production plant.
OBJECTIVE: The objective of this study was to conduct a case-control study of lung cancer nested within a cohort of 1528 German carbon black workers, 1976-1998. METHODS: The authors conducted risk-set sampling of two controls matched on year of birth and conditional logistic regression modeling of cumulative carbon black exposure, duration of work in different departments, feedstock contact, asbestos exposure, smoking, age at hire, exposures before the carbon black job, and serving as a soldier in World War II or being a prisoner of war. Analyses were performed with both the full cohort and members of an inception cohort subset. Exposures were lagged by 10 years. RESULTS: Analysis of 50 lung cancer deaths showed no association to carbon black exposure. CONCLUSIONS: Carbon black exposure was not linked to lung cancer risk. Suggestions of positive associations with asbestos exposure, feedstock contact, and work in specific departments are inconclusive due to small numbers.
Asbestos↗
Preventing AIDS among black gay men and black gay and heterosexual male intravenous drug users.
The black population is disproportionately affected by acquired immune deficiency syndrome (AIDS). Among those black people most at risk of becoming infected with the human immunodeficiency virus are black men who use intravenous drugs and black men who are gay. This article explores the complex cultural, economic, and social factors obstructing the reduction of the AIDS rate among these men. Implications and recommendations are made for developing effective AIDS prevention efforts by highlighting race-specific resources and supports for high-risk black men.
Acquired Immunodeficiency Syndrome↗
The help-seeking behavior of black Americans. A summary of findings from the National Survey of Black Americans.
In 1977, the National Institute of Mental Health funded the National Survey of Black Americans (NSBA). The NSBA was an omnibus, nationally representative sample (N = 2,107) of adult black Americans that explored numerous issues relevant to black quality of life. One topic that has received much attention is where blacks go for help during periods of crisis. This article provides a brief summary of NSBA findings on the use of informal help, professional help, and insurance coverage. Suggestions for future research directions for those interested in the help-seeking behavior of black Americans are provided.
Adolescent↗
Greater renal vascular involvement in the black patient with essential hypertension. A comparison of systemic and renal hemodynamics in black and white patients.
Systemic, splanchnic, and renal hemodynamic data were derived from 60 male and female, black and white, untreated and uncomplicated patients with essential hypertension. The systemic hemodynamic data confirmed our previous findings that at any level of arterial pressure, when black and white patients are matched for age, sex, and mean arterial pressure, cardiac index and total peripheral resistance were similar. This suggests that hypertensive vascular disease is no more severe in the black. This concept was supported further with respect to the splanchnic vasculature; however, renal blood flow was less and renal vascular resistance was higher at any level of mean arterial pressure (or total peripheral resistance) in the black. These physiological findings lend credence to those reports suggesting that at any level of pressure, hypertensive disease and morbidity (e.g., renal impairment) are more severe in the black patient. In addition, these data underscore the importance of understanding regional circulatory characteristics and they do not necessarily follow pari passu measured indices of systemic hemodynamics.
Black People↗
Fine structural aspects of the black thyroid induced by minocycline, and the effects of a low iodine diet, propylthiouracil, thyroxine tablet and TSH, on the black discoloration of the rat thyroid.
Fine structural aspects of the effect of minocycline, an antibiotic of the tetracycline group, on the rat thyroid were studied. In all the rats administered minocycline (100 mg/kg/day) for 21 days, diffuse black discoloration of the thyroid gland occurred. However, when the rats were fed on a low iodine diet, given propylthiouracil (PTU) or thyroxine tablet with minocycline the black pigmentation of the thyroid gland did not take place. On the other hand, black discoloration of the thyroid was accelerated in the rats administered TSH and minocycline simultaneously. Ultrastructurally, numerous dense bodies containing highly electron-dense deposits were seen in the supranuclear region of the follicular epithelial cells of the black thyroid. These dense bodies, which showed positive acid phosphatase activity, are considered to be lysosomes containing minocycline or its derivatives. It is speculated that minocycline is taken up into follicular epithelial cells with iodine, and that the black discoloration of the thyroid gland is intimately related to iodine metabolism.
Animals↗
Neurotoxic effects of venoms from seven species of Australasian black snakes (Pseudechis): efficacy of black and tiger snake antivenoms.
1. Pseudechis species (black snakes) are among the most widespread venomous snakes in Australia. Despite this, very little is known about the potency of their venoms or the efficacy of the antivenoms used to treat systemic envenomation by these snakes. The present study investigated the in vitro neurotoxicity of venoms from seven Australasian Pseudechis species and determined the efficacy of black and tiger snake antivenoms against this activity. 2. All venoms (10 microg/mL) significantly inhibited indirect twitches of the chick biventer cervicis nerve-muscle preparation and responses to exogenous acetylcholine (ACh; 1 mmol/L), but not to KCl (40 mmol/L), indicating activity at post-synaptic nicotinic receptors on the skeletal muscle. 3. Prior administration of either black or tiger snake antivenom (5 U/mL) prevented the inhibitory effects of all Pseudechis venoms. 4. Black snake antivenom (5 U/mL) added at t90 (i.e. the time-point at which the original twitch height was reduced by 90%) significantly reversed the effects of P. butleri (28+/-5%), P. guttatus (25+/-8%) and P. porphyriacus (28+/-10%) venoms. Tiger snake antivenom (5 U/mL) added at the t90 time-point significantly reversed the neurotoxic effects of P. guttatus (51+/-4%), P. papuanus (47+/-5%) and P. porphyriacus (20+/-7%) venoms. 5. We show, for the first time, the presence of neurotoxins in the venom of these related snake species and that this activity is differentially affected by either black snake or tiger snake antivenoms.
Animals↗
Qualitative analysis of MDR-reversing Anastasia Black (Russian black sweet pepper, Capsicum annuum, Solanaceae) extracts and fractions by HPLC and LC-MS-MS methods.
In earlier experiments, the MDR (multidrug resistance)-reversal activities of Anastasia Black (Russian black sweet pepper) extracts had been analysed. Recently, the most effective MDR reversing extracts and fractions have been separated by HPLC (high-performance liquid chromatography, for carotenoids) and LC-MS-MS (HPLC combined with mass spectrometry, for phenolic compounds) methods. As a result of the analytical studies, the following flavonoids had been identified: feruloyl glucopyranoside, quercetin rhamnopyranoside glucopyranoside, luteolin glucopyranoside arabinopyranoside, apigenin glucopyranoside arabinopyranoside, quercetin rhamnopyranoside, luteolin arabinopyranoside diglucopy-ranoside, hesperidine and luteolin glucuronide. According to the literature, the aglycones of these phenolic compounds exhibit MDR-reversal activity in vitro, and the connection between the phenolic content of Anastasia Black and MDR-reversal action was therefore studied by different analytical methods. The results of this study revealed that the identified flavonoids of Anastasia Black may be only partially responsible for the modulation of the MDR of mouse lymphoma cells. Other lipophilic compounds, most probably carotenoids, present in Russian black sweet pepper may act as inhibitors of MDR reversal.
Animals↗
Cancer of the skin in blacks. I. A review of 163 black patients with cutaneous squamous cell carcinoma.
Cancer of the skin, in general, is believed to be rather uncommon in black persons. Information from the Tumor Registry of Charity Hospital of Louisiana in New Orleans was reviewed in reference to black patients who were diagnosed as having squamous cell carcinoma (SCC) of the skin between 1948 and 1979. During this period, 163 black patients had a total of 176 SCCs of the skin. The lesions were about 20% more common than basal cell carcinomas (BCCs) in blacks of the same patient population. A mortality of 18.4% was a significant finding. The most common sites of involvement were the face and the lower extremity. Collectively, involvement of the non-sun-exposed areas was more common. The most common predisposing conditions were scarring processes.
Adolescent↗
The role of a historically black university and the black church in community-based health initiatives: the project DIRECT experience.
This work explores the role of North Carolina Central University (NCCU), a historically Black university, and local Black churches in serving as community resources in Project Diabetes Interventions Reaching and Educating Communities Together (Project DIRECT). Project DIRECT is a federally funded participatory research project sponsored by the Centers for Disease Control and Prevention. The rationale for involving NCCU is presented. The authors review how faith-centered strategies were used in local churches to create social and environmental changes to support diabetes prevention and control. Involving historically Black colleges and universities and Black churches in health promotion at the community level represents an excellent example of how local institutional resources can help eliminate health disparities.
Black People↗
Negro, Black, Black African, African Caribbean, African American or what? Labelling African origin populations in the health arena in the 21st century.
Broad terms such as Black, African, or Black African are entrenched in scientific writings although there is considerable diversity within African descent populations and such terms may be both offensive and inaccurate. This paper outlines the heterogeneity within African populations, and discusses the strengths and limitations of the term Black and related labels from epidemiological and public health perspectives in Europe and the USA. This paper calls for debate on appropriate terminologies for African descent populations and concludes with the proposals that (1) describing the population under consideration is of paramount importance (2) the word African origin or simply African is an appropriate and necessary prefix for an ethnic label, for example, African Caribbean or African Kenyan or African Surinamese (3) documents should define the ethnic labels (4) the label Black should be phased out except when used in political contexts.
Black People↗
Mati-ism and black lesbianism: two idealtypical expressions of female homosexuality in black communities of the Diaspora.
There are different ways in which black women in the Diaspora have given expression to their erotic fascination with other women. In this article two idealtypical expressions of black female homosexuality and the outlines of their underlying cosmologies are sketched: mati-ism and black lesbianism. Mati (or matisma) is the Sranan Tongo word for women who have sexual relations with other women, but who typically also will have had or still have relationships with men, simultaneously. More often than not they will also have children. While both types can only be understood via a constructionist view of homosexuality, the institution of mati-ism will be shown to have retained more Afrocentric, working class elements, while black lesbianism has more middle class, Eurocentric features.
Adult↗
Survival rates with coronary artery disease for black women compared with black men.
OBJECTIVE: To evaluate the influence of gender on the prognosis of coronary heart disease among black patients. DESIGN: Cohort study based on a consecutive sample from a hospital registry, with a mean follow-up of 4 years. SETTING: An inner-city public hospital in Chicago, Ill. PATIENTS: The study included 1719 consecutive black patients (780 men and 939 women) who had any one of the following events: cardiac catheterization for presumed coronary heart disease, hospitalization for acute myocardial infarction, or coronary artery bypass grafting. RESULTS: Hospital and operative mortality rates following acute myocardial infarction and coronary artery bypass grafting were similar between the two sexes. The relative risks for cardiac death in women vs men were 0.88 (95% confidence interval [CI], 0.60 to 1.28), 0.79 (95% CI, 0.53 to 1.17), and 0.79 (95% CI, 0.34 to 1.85) for coronary artery disease, acute myocardial infarction, and coronary artery bypass grafting, respectively, after adjusting for age, history of diabetes, hypertension, angina pectoris and myocardial infarction, number of diseased vessels, and ejection fraction. Compared with patients of the same sex with normal angiograms, relative risk estimates were 5.0, 10.1, and 6.3 for women and were 1.8, 4.0, and 2.0 for men in the same three groups of patients, respectively. CONCLUSIONS: Survival with coronary artery disease in black women is similar to that observed in black men, but relative to members of the same sex without the disease, the prognosis for women is considerably worse than for men.
Black or African American↗
Perspectives of hypertension in black patients: black vs. white differences.
Hypertension is a major disease in the black population of sub-Saharan Africa and the U.S. The prevalence of hypertension varies from 1-30% of the adult population. Differences in blood pressure (BP) between black and white patients have been documented. In this review, genetic, endocrine, and environmental characteristics, renal physiology, and cardiac function are reviewed. Racial differences in renal physiology and socioeconomic status seem to account for BP differences. Black hypertensive patients in sub-Saharan Africa are prone to cerebral hemorrhage, malignant hypertension leading to uremia, and congestive heart failure, whereas coronary artery disease is uncommon. Responses to hypotensive agents like beta-blockers and angiotensin-converting enzyme inhibitors are poor unless these agents are combined with a thiazide diuretic. Black hypertensive patients respond best to diuretics, vasodilators, or calcium channel blockers. A profiled approach to the treatment of hypertension is suggested.
Black People↗
Health care crisis in the black community: challenges prospects, and the black nurse.
The Black community, particularly in major urban settings, is faced with escalating social, economic, and life-style problems, which threaten the life and well-being of current and future generations of Black people in crisis proportion. The rising number of deaths due to heart disease and stroke, homicide and accidents related to substance abuse, AIDS, cancer, and infant mortality are among the leading culprits. They interfere with prospects of longevity, joblessness, poverty, and homelessness and further complicate the crisis. These problems have implications for the practice of nursing. The magnitude of the problems dictate the need for modifications in the health care delivery system and how future practitioners of nursing are educated. The inextricable role of the community, although often underaddressed, in solving its own problems is among the promising strategies for resolving the crisis. Black nurses, in particular, must accept the challenge and the opportunity to test innovative and sensitive interventive strategies which will enable the Black community to emerge from the complex and haunting problems which threaten well-being.
Black or African American↗