Higher photosynthetic efficiency was found in mats with a thinner and more densely populated euphotic zone. Microbial mats exhibit a lower https://www.selleckchem.com/products/acalabrutinib.html photosynthetic efficiency compared with ecosystems with a more open canopy-like organization of photosynthetic elements, where light propagation is not hindered to the same

extent by photosynthetically inactive components; such components contributed about 40-80% to light absorption in the investigated microbial mats, which is in a similar range as in oceanic planktonic systems.”
“A decline in estrogen levels during menopause is considered to be an important factor in the pathogenesis of Alzheimer’s disease (AD). Since neuroprotective effects of estrogens are mediated largely

through their cognate receptors, investigations of the expression of estrogen receptors (ER) in the human brain areas this website involved in the regulation of cognitive functions is of great importance. This mini-review summarizes the data obtained by the author on the ER expression in hippocampus, cholinergic basal forebrain nuclei, tuberomamillary and medial mamillary hypothalamic nuclei. The studies were carried out on postmortem brain material of men and women with AD and in control cases that were matched for age and gender. Immunocytochemical expression of the nuclear ER alpha in the basal forebrain and in the hypothalamus was markedly higher in AD patients than in control subjects. On the contrary, nuclear ER alpha in the hippocampus of AD patients was diminished. Using polymerase chain reaction, 62 ER alpha mRNA splice variants were isolated from different human brain areas. Fifty of them were found for the first time. The dominant negative variant Delta 7 (deletion of selleck chemicals exon 7) that can suppress estrogen signaling through classical ERs appeared to be the most common. The number of ER alpha mRNA splice variants detected per brain area

was more prominently decreased in AD women as compared to control. Moreover, the m RNA levels of the major ER alpha splice forms in the medial temporal cortex and in the hippocampus were notably diminished in AD women. Two novel ER alpha splice variants MB1 and TADDI were studied in detail at the protein level with the help of polyclonal antibodies. Immunocytochemical expression of TADDI was significantly elevated in the nucleus basalis of Meynert, tuberomamillary hypothalamic nucleus and in the hippocampus of postmenopausal women. In the same brain areas TADDI immunoreactivity was decreased in AD women. Taken together, the data show a clear tendency for the accumulation of the mutant forms of the ER alpha in the brain of postmenopausal women and for the down-regulation of the ER alpha mRNA alternative splicing in the brain of AD women.”
“Drug-resistant supraventricular tachycardia can cause hemodynamic instability, especially in infants.