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Results for “Cultural Evolution”

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At least 721 records · Page 40Linked to original sources
PubMed1993

[Various nuclear and cytoplasmic parameters in relation to the evolution of an in vitro culture of rat fibroblasts].

A cytokinetic study was performed on progressive subcultures of a cellular strain represented by fibroblasts (FG: Fibroblasts Galliera). Our previous studies on these cells showed morphofunctional changes in relation to cell ageing, indicating the stabilization of a cell line with high proliferative capacity. Furthermore, in the present work, we carried out a comparative analysis with a neoplastic strain (SGS/3A cells), characterized by a low state of cell differentiation. The morphological (fluorescence microscopy) and quantitative (flow cytometry) analysis, examined the relative DNA/protein and DNA/RNA ratios. Moreover, the replicative and mitotic activity and the apoptotic degeneration was determined. The results obtained indicated the existence in this biological model of a different relation between cell growth and cell proliferation. The analysis of our results allowed us to hypothesize that the cellular subpopulation selected during the culture progression of FG cells constitutes a cell line highly able of survival in vitro. In these cells the high proliferative activity is opposite to a reduced metabolism.

Animals↗
PubMed1995

Adaptation of the resettled Kenyah Dayak villagers to riverine environment in east Kalimantan: a preliminary report.

The Kenyah Dayak in East Kalimantan (Indonesia), who migrated from their mountainous homeland to a riverine village in the 1940s, have subsisted on slash-and-burn rice cultivation. To cope with rapidly increasing population, the villagers have not changed their farming practice to increase land productivity but instead have exploited fields in remote riverbanks, using motorized canoes.

Agriculture↗
PubMed1995

[Effect of major epidemics on cultural awareness].

Mankind has been stricken with "major" epidemic diseases throughout its history. The most serious among them immediately threaten man's life e.g. plague, cholera, smallpox, typhus, and dysentery, besides, there are others which take a slower course e.g. lues, leprosy, leishmaniasis, tuberculosis, and malaria. Yet, the "lesser" epidemic diseases like diphtheria, scarlet fever, mumps, pneumococcosis, influenza, and most recently AIDS may also turn into "major" ones. Originally, man exclusively depended on his genetic makeup for protection, and being particularly prone to attacks of disease he was subject to natural selection. Thus, only one human species survived, the homo sapiens. Interbreeding achieved biologic adaptation and created a balanced genetic polymorphism. Advancing in his degree of civilization, man formed groups, developed clothing, fire, houses, and tools, and his increasing cultural awareness allowed him to migrate from the tropical climates to more temperate, and less disease-infested zones. Immigration and wars, and the accompanying infections jeopardized and diminished entire populations and eradicated highly developed cultures like that of the American Indians. The plague, coming from Asia, and lues, from America, as well as cholera, influenza, and smallpox spread around the whole globe. Fear and terror led to irrational conclusions and triggered persecutions. The attitude of accepting disease as a God-sent fate (Hiob), or a God-sent punishment suppressed reasonable measures against disease. The necessary official measures have increasingly restricted liberty, and this patronizing treatment needs to be opposed with a higher sense of responsibility. Medical art has developed from more healing towards prophylactic and predictive medicine, which prognosticates the individual susceptibility to particular infections, and other risk factors.

Cultural Evolution↗
PubMed1996

Force, development, and neoplasia: development from another perspective as illustrated through a study of in vitro plant development from neoplasm.

Differentiation from the neoplastic state can be a dynamic adaptation to the localized stress of increasing cohesive forces in tissue. Repulsive forces, occurring within and between cells, are seen as leading to de-differentiation into the neoplastic state or neoplasm. During early development, especially where and when mitosis occurs frequently, cohesive and repulsive forces may necessarily coexist in oscillating degrees. Correspondingly, cohesive-force and repulsive-force generating metabolites may co-exist in oscillating concentrations. Cancer or neoplasia occurs, according A. Szent-Gyorgyi, when cohesiveness breaks down locally, probably thru the conversion of methylglyoxal into lactic acid. Cancer may also occur due to the accumulation of such putatively, repulsion-generating factors as lactic acid. Plant tumors in vitro respond adaptively to cohesion-generating chemicals, such as ascorbic acid and methylglyoxal, by generating buds, embryos, and plantlets.

Adaptation, Physiological↗
PubMedDate not supplied

[The streptococcal and staphylococcal toxic shock syndrome. Comments on 4 cases].

Between 1989 and 1995 in the Hospital of Infectious Diseases from Iaşi have been diagnoses 4 cases of streptococcal/staphylococcal toxic syndrome. Three patients have been grown up and one child. Two of them were immunocompromised hosts (cirrhosis, lung tuberculosis, alcoholism). The gate of entry was cutaneous in 3 cases and probably mucous in the 4th case. The clinical symptoms were fever, generalized erythematous rush followed by desquamation, low arterial pressure with oliguria, tachycardia, jaundice moderate, elevated ALAT. The bacteriological diagnosis was confirmed by isolating the pathogen agent from the erysipelatous placard and from blood culture. The evolution of the illness was nefavourable in 2 cases. The cause of the death was the MSOF (multiple systemic organic failure).

Adolescent↗
PubMed1998

Women in cultural transition: suicidal behavior in South African Indian women.

Young South African Indian women are a population with relatively high rates of suicidal behavior. This article presents three illustrative case studies of nonfatal suicidal behavior by South African Indian women. The cases are discussed in relation to a review of epidemiological, historical, and sociocultural perspectives on South African Indian women. It is argued that suicidal behaviors in this group can be understood in the context of sociocultural transition. Transitional tensions between traditional Indian culture and Westernization have an impact on traditional gendered power relations and generate conflicts that have intrapsychic and interpersonal consequences for women and for men. These in turn may have adverse effects on marital functioning, quality of life, and specific aspects of emotional functioning, which have been identified as precursors of suicidal behavior. The case studies are discussed with reference to gender narratives. Implications for prevention, intervention, and future research are discussed.

Adult↗