Among the terrestrial epilithic cyanobacteria isolated from Roman hypogea at extremely low light intensity, a non-heterocystous strain, belonging to the genus Leptolyngbya, showed a marked photobehavior. These red cyanobacteria possess an orange spot at the tip of the apical cell. Micro-spectrophotometric analysis of this tip showed an absorption spectrum with two bands, centered at 456 and 504 nm, respectively. Experiments on photo-orientation impairment of these cells, and micro-spectrophotometric analysis of the tip of impaired trichomes showed that a rhodopsin-like protein might be present in this structure. All these data could support the hypothesis of the presence of a complex photoreceptive system in this prokaryote.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/s0968-4328(99)00063-3 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Differences in Behavior During Early Nectarine Infection Among Main spp. Causing Brown Rot.
Phytopathology
January 2025
Centro de Investigaciones Biologicas, Departament of Cellular and Molecular Biology, Ramiro de Maeztu, 9, Madrid, Madrid, Madrid, Spain, 28040.
Brown rot is a disease that affects stone and pome fruit crops worldwide. It is caused by fungal members of the genus , mainly , and . This study presents evidence that, despite having a very similar battery of Cell Wall Degrading Enzymes (CWDEs), the three species behave differently during the early stages of infection, suggesting differences at the regulatory level, which could also explain the differences in host preference among the three species.
View Article and Find Full Text PDFBlue light-driven cell cycle arrest in thyroid cancer via Retinal-OPN3 complex.
Cell Commun Signal
November 2024
Department of Endocrinology, Nanjing Drum Tower Hospital, School of Life Science and Technology, China Pharmaceutical University, Nanjing, 211198, China.
Background: Papillary thyroid carcinoma (PTC) is the most common type of thyroid malignancy, with a rising incidence. Traditional treatments, such as thyroidectomy and radiotherapy, often lead to significant side effects, including impaired thyroid function. Therefore, there is an urgent need for non-invasive therapeutic approaches.
View Article and Find Full Text PDFA one-day journey to the suburbs: circadian clock in the Drosophila visual system.
FEBS J
November 2024
Department of Biology, University of Padua, Padua, Italy.
Living organisms, which are constantly exposed to cyclical variations in their environment, need a high degree of plasticity in their visual system to respond to daily and seasonal fluctuations in lighting conditions. In Drosophila melanogaster, the visual system is a complex tissue comprising different photoreception structures that exhibit daily rhythms in gene expression, cell morphology, and synaptic plasticity, regulated by both the central and peripheral clocks. In this review, we briefly summarize the structure of the circadian clock and the visual system in Drosophila and comprehensively describe circadian oscillations in visual structures, from molecules to behaviors, which are fundamental for the fine-tuning of visual sensitivity.
View Article and Find Full Text PDFAll-In-One Optoelectronic Transistors for Bio-Inspired Visual System.
Adv Mater
November 2024
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Visual perception has profound effects on human decision-making and emotional responses. Replicating the functions of the human visual system through device development has been a constant pursuit in recent years. However, to fully simulate the various functions of the human visual system, it is often necessary to integrate multiple devices with different functions, resulting in complex, large-volume device structures and increased power consumption.
View Article and Find Full Text PDFPhotoneuroendocrine, circadian and seasonal systems: from photoneuroendocrinology to circadian biology and medicine.
Cell Tissue Res
September 2024
Institute Anatomy I, Medical Faculty, Heinrich Heine University, Duesseldorf, Federal Republic of Germany.
This contribution highlights the scientific development of two intertwined disciplines, photoneuroendocrinology and circadian biology. Photoneuroendocrinology has focused on nonvisual photoreceptors that translate light stimuli into neuroendocrine signals and serve rhythm entrainment. Nonvisual photoreceptors first described in the pineal complex and brain of nonmammalian species are luminance detectors.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!