A Flicker In The Dark Epub Download
Leslee Galyan
Purpose: The rodent retina does not exhibit a positive OFF-response in the electroretinogram (ERG), which makes it difficult to evaluate its OFF-pathway functions in vivo. We studied the rod-driven OFF pathway responses by using a dark-adapted 10-Hz flicker ERG procedure in mouse.
Materials and methods: Conventional ERGs and 10-Hz dark-adapted flicker ERGs were obtained in wild-type mice (C57BL/6), in mice with pure rod (cpfl1) or pure cone (rho(-/-)) function, and in nob1 mice which have a selective ON-pathway defect. To isolate the response from ON or OFF pathway, glutamate analogs 2-amino-4-phosphobutyric acid (APB, an ON pathway blocker) and cis-2, 3-piperidine-dicarboxylic acid (PDA, an OFF pathway blocker), were injected intravitreally.
Results: The amplitude-intensity profile of the dark-adapted 10-Hz flicker ERG in the wild-type mice exhibits two peaks at middle and high light intensities. The two peaks represent rod- and cone-driven responses respectively. In APB-treated C57BL/6 mice and in nob1 mice, the dark-adapted ERG b-waves were absent. However, both rod- and cone-driven OFF pathway responses were evident with flicker ERG recording. At middle light intensities that activate only rod system, the flicker ERG responses in saline-injected nob1 mice were similar to those in APB-injected cpfl1 mice and wild-type mice. These responses are sensitive to PDA. The amplitudes of these rod-driven OFF pathway responses were approximately 20% of the total rod-driven flicker ERG responses.
Conclusion: We demonstrate that the rod-OFF bipolar cell pathway is functional in the outer retina. The dark-adapted flicker ERG is practical for the evaluation of rod- and cone-driven responses, and the residual OFF pathway signals in subjects with ON pathway defects.
In order to get dark background and light font in the Ebook viewer, just open an ebook with it (with the viewer, not with Calibre itself; or, from Calibre main, select the book and press "View" (Read books) button); then, right-click, then Preferences. Or alternatively open the book and right-click anywhere in it and click Preferences.
With certain ebook documents I have seen an odd problem where the font color stayed black no matter the above settings, in which case making the background dark is not an option. In such cases some other ebook readers had the same problem (Foliate), while some could fix it (Bookworm).
As said here in relation to the font type, the CSS file inside the ebook may override the software settings, including font color. Testing that, I have extracted the epub file (it's a zip in fact; some archive managers need the zip extension, some can extract directly) and found an /EXTRACTED_LOCATION/OEBPS/Content/Content.css where the line color:Black appeared multiple times. Replacing that with "Gray" gives a rather dark (but readable) gray, while "#DBDBDB" gives a lighter gray. (After that change, compress the extracted files and folders back into a zip file and change that extension to epub.)
The newer version of calibre 4.16 has an option in Preferences -> Colors called "override book colors" which could be used to enforce consistent colors in dark mode: Here is a snapshot.Click OK and you are all set.
Be prepared to unravel your thoughts and share your unanswered questions about this book with your group. Use these A Flicker in the Dark book club questions to get your convo going. This discussion guide for A Flicker in the Dark includes a synopsis, 10 book club questions, some selected reviews (some folks loved it, others hated it) and three (dark and twisty) related reads.
We have quite a few book club guides for dark mysteries and psychological thrillers. Check out our discussion guides for The Silent Patient, Verity, Into the Water, The Paris Apartment, The Last Thing He Told Me, The Guest List, Run Rose Run, I Have Some Questions for You, The Housemaid, The Northern Spy, and None of This is True. Each has a synopsis at the top of the page.
There are woods, and the woods are dark, though there are lights hung from the trees. Many of the lights no longer light up. Around the edge of the clearing, someone has strung a long chain of origami animals on barbed wire, some gilded paper and some newsprint, some pages torn out of books, some photographs, each animal snagged on its own spike. The animals have been rained on, and more than once. Not all of them are animals, not exactly. There are some shapes unknown here. The grass is trampled down in the center of the clearing, and there are muddy swathes deep enough to drown in.
Wren can see shadows, cast inward toward her. Spiny shadows, antlers, horns, fur. Tails. Something lashing and coiled. She hears her cat again, yowling, and she clucks for him to come to her. Susurrus bolts out of the dark, running, fur on end, ears flattened.
We know that no one can resist popcorn, and so we pop it here. They used to come from miles around, baited by the show, tickets clutched in grubby fists. Families, and single men looking for the carnival strippers. Women used to arrive in groups, holding hands in the dark, fearful, but ready. Grandfathers with their grandchildren. There are fewer now than there were.
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