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51.
Dante Borelli 《Mycopathologia》1972,46(3):233-236
The author's criteria about the modus operandi in the administration of amphothericin B are presented in detail. It is generally recommended that the minimal active dosis be uninterruptedly administered during the total scheduled time. Basic well-being of the patient is to be procured. Doses of 0,10 to 0,50 mg/kg of body weight, administered during 15 to 60 minutes 4 times a week, are the correct ones for most infections. Amphotericin B may be administered that way during several months, until 1 year, without producing irreversible functional impairment of the kidneys.It is the author's opinion that all the infections must be treated by the continuous administration of the corresponding drugs, whereas the criterion of cycles and intervals is altogether irrational. 相似文献
52.
THE FINE LOCALIZATION OF NUCLEOSIDE TRIPHOSPHATASE ACTIVITY IN THE RETINA OF THE FROG 总被引:5,自引:5,他引:0 下载免费PDF全文
Nucleoside triphosphatase (NTPase) activity was demonstrated at the submicroscopic level in the frog retina by the Wachstein-Meisel method utilizing various purine and pyrimidine nucleosides. Under the electron microscope magnesium-activated NTPase was localized in the outer and inner segments, and in the plexiform layers. NTPase active sites in the cones were localized diffusely in the 70 to 80 A interspaces between the double membranes of the stacked lamellae and in the investing cytoplasm. In the rods, on the other hand, sites of activity were observed at the periphery of the stacked lamellae as discrete electron opaque deposits measuring 1000 to 1500 A which interdigitated between the lamellae for short distances. Deposits of reaction product appeared more numerous in rods of dark-adapted frogs stimulated with monochromatic light with a wave length of 510 mµ. Enzyme activity was also observed in mitochondria of the rod and cone ellipsoids. In the outer and inner plexiform layers NTPase active sites were present on and between the membranes of axons and the plasma membranes of some of the neurons. 相似文献
53.
Reinier Oropesa-Nuñez Sandeep Keshavan Silvia Dante Alberto Diaspro Benedetta Mannini Claudia Capitini Cristina Cecchi Massimo Stefani Fabrizio Chiti Claudio Canale 《Biophysical journal》2018,114(6):1357-1367
The deposition of fibrillar protein aggregates in human organs is the hallmark of several pathological states, including highly debilitating neurodegenerative disorders and systemic amyloidoses. It is widely accepted that small oligomers arising as intermediates in the aggregation process, released by fibrils, or growing in secondary nucleation steps are the cytotoxic entities in protein-misfolding diseases, notably neurodegenerative conditions. Increasing evidence indicates that cytotoxicity is triggered by the interaction between nanosized protein aggregates and cell membranes, even though little information on the molecular details of such interaction is presently available. In this work, we propose what is, to our knowledge, a new approach, based on the use of single-cell force spectroscopy applied to multifunctional substrates, to study the interaction between protein oligomers, cell membranes, and/or the extracellular matrix. We compared the interaction of single Chinese hamster ovary cells with two types of oligomers (toxic and nontoxic) grown from the N-terminal domain of the Escherichia coli protein HypF. We were able to quantify the affinity between both oligomer type and the cell membrane by measuring the mechanical work needed to detach the cells from the aggregates, and we could discriminate the contributions of the membrane lipid and protein fractions to such affinity. The fundamental role of the ganglioside GM1 in the membrane-oligomers interaction was also highlighted. Finally, we observed that the binding of toxic oligomers to the cell membrane significantly affects the functionality of adhesion molecules such as Arg-Gly-Asp binding integrins, and that this effect requires the presence of the negatively charged sialic acid moiety of GM1. 相似文献
54.
Lanping Li Zhikuo Li Marc W. Cadotte Peng Jia Guanguang Chen Lanna S. Jin Guozhen Du 《Oecologia》2016,182(2):419-428
The study of phylogenetic conservatism in alpine plant phenology is critical for predicting climate change impacts; currently we have a poor understanding of how phylogeny and climate factors interactively influence plant phenology. Therefore, we explored the influence of phylogeny and climate factors on flowering phenology in alpine meadows. For two different types of alpine plant communities, we recorded phenological data, including flowering peak, first flower budding, first flowering, first fruiting and the flowering end for 62 species over the course of 5 years (2008–2012). From sequences in two plastid regions, we constructed phylogenetic trees. We used Blomberg’s K and Pagel’s lambda to assess the phylogenetic signal in phenological traits and species’ phenological responses to climate factors. We found a significant phylogenetic signal in the date of all reproductive phenological events and in species’ phenological responses to weekly day length and temperature. The number of species in flower was strongly associated with the weekly day lengths and followed by the weekly temperature prior to phenological activity. Based on phylogenetic eigenvector regression (PVR) analysis, we found a highly shared influence of phylogeny and climate factors on alpine species flowering phenology. Our results suggest the phylogenetic conservatism in both flowering and fruiting phenology may depend on the similarity of responses to external environmental cues among close relatives. 相似文献
55.
Direct and label‐free detection of the human growth hormone in urine by an ultrasensitive bimodal waveguide biosensor 下载免费PDF全文
Ana Belén González‐Guerrero Jesús Maldonado Stefania Dante Daniel Grajales Laura M. Lechuga 《Journal of biophotonics》2017,10(1):61-67
A label‐free interferometric transducer showing a theoretical detection limit for homogeneous sensing of 5 × 10–8 RIU, being equivalent to a protein mass coverage resolution of 2.8 fg mm–2, is used to develop a high sensitive biosensor for protein detection. The extreme sensitivity of this transducer combined with a selective bioreceptor layer enables the direct evaluation of the human growth hormone (hGH) in undiluted urine matrix in the 10 pg mL–1 range.
56.
Migliaccio AR Rotili D Nebbioso A Atweh G Mai A 《The international journal of biochemistry & cell biology》2008,40(11):2341-2347
Epigenomic modifiers, such as histone deacetylase inhibitors, are compounds that regulate gene expression by interfering with the enzymatic machinery that maintains the proper chromatin structure of the nucleus. These compounds are at the forefront of novel therapeutic agents for the treatment of several diseases including cancer and genetic disorders such as beta-thalassemia and sickle cell disease. Here we review the current understanding of the mechanism of action of epigenomic modifiers in the treatment of beta-thalassemia and sickle cell anemia. We also discuss how the lessons learned from the study of the effects of these compounds on the beta-globin locus, one of the best characterized regions of the human genome, might contribute to the understanding of the mechanism of action of these same compounds in cancer, where the specific regions of the genome that are responsible for the pathophysiology of the disease are often poorly defined. 相似文献
57.
Mai A Perrone A Nebbioso A Rotili D Valente S Tardugno M Massa S De Bellis F Altucci L 《Bioorganic & medicinal chemistry letters》2008,18(8):2530-2535
A novel series of non-hydroxamate HDAC inhibitors (HDACi) showing a uracil group at the left and a 2-aminoanilide/2-aminoanilide-like portion at the right head have been reported. In particular, the new compounds incorporating a 2-aminoanilide moiety behaved as class I-selective HDACi. Compound 8, the most potent and class I-selective, showed weak apoptosis (higher than MS-275) joined to cytodifferentiating activity on U937 cells. Surprisingly, the highest differentiation was observed with 13, through an effect that seems to be unrelated to HDAC inhibition. 相似文献
58.
PD Dr. D. Wieczorek 《Medizinische Genetik》2009,21(2):224-230
Clarification of the cause of mental retardation, which has a prevalence of 2–3%, is a common reason for genetic consultation. On the basis of the cardinal sign of microcephaly, which also has a prevalence of 2–3%, an overview on different conditions with developmental delay/mental retardation is given according to the mode of inheritance. The current version of the Winter–Baraitser Dysmorphology Database lists 558 conditions with the combination of microcephaly and developmental delay/mental retardation. This makes clear that the following overview gives only a limited look at the comprehensive field of clinical genetics/dysmorphology. 相似文献
59.
Renate Radek PD Dr. 《当今生物学》2009,39(4):242-248
Three new, membrane‐bounded organelles were detected in the last decade. Acidocalcisomes which occur in pro‐ and eukaryotes are acidic and store calcium, and further also phosphate, oxygen, magnesium, zink, sodium, potassium, and iron. Furthermore, they are engaged in osmoregulation, pH‐ and Ca2+‐homeostasis. Mitosomes are strongly reduced mitochondria of different parasitic protists, which were previously grouped as primarily mitochondria‐free organisms. Apicoplasts are the strongly reduced plastids of the parasitic apicomplexans (formerly sporozoa). They are a target for the development of new drugs, e.g. against the cause of malaria, Plasmodium. 相似文献
60.
Andrea Savarino Antonello Mai Sandro Norelli Sary El Daker Sergio Valente Dante Rotili Lucia Altucci Anna Teresa Palamara Enrico Garaci 《Retrovirology》2009,6(1):1-10