Gynecological emergency ultrasound in daytime and at night: differences that cannot be ignored

Biological Risks and Laboratory-Acquired Infections: A Reality That Cannot be Ignored in Health Biotechnology

Advances and research in biotechnology have applications over a wide range of areas, such as microbiology, medicine, the food industry, agriculture, genetically modified organisms, and nanotechnology, among others. However, research with pathogenic agents, such as virus, parasites, fungi, rickettsia, bacterial microorganisms, or genetic modified organisms, has generated concern because of their...

Editorial comment: Ventricular assist devices for advanced heart failure: evidence that cannot be ignored.

Workplace bullying in nursing: a problem that can't be ignored.

Workplace bullying is a serious problem affecting nursing. Abusive workplaces result in lack of job satisfaction, poor retention, and adverse patient outcomes. The purpose of this article is to present the history of this problem in nursing and offer potential solutions.

Aspherical manifolds that cannot be triangulated

Although Kirby and Siebenmann [13] showed that there are manifolds which do not admit PL structures, the possibility remained that all manifolds could be triangulated. In the late seventies Galewski and Stern [10] constructed a closed 5–manifold M 5 so that every n–manifold, with n 5, can be triangulated if and only if M 5 can be triangulated. Moreover, M 5 admits a triangulation if and only if...

Modeling Daytime and Night Illumination

Modeling illumination of outdoor objects by natural light sources the Sun, the Moon and the stars is a very difficult problem due to highly complex physics of light rays and the Earth’s atmosphere. Although there are many studies in the literature on modeling of astronomic and atmospheric phenomena, of emission, scattering and absorption of light rays through the atmosphere, and of the illumina...