Documentation of the Development of Various Visuomotor Responses in Typically Reared Kittens and Those Reared With Early Selected Visual Exposure by Use of a New Procedure

A new procedure was used to study the development of gaze (responses to moving targets or laser spots in normal kittens, those that had been reared in total darkness to 6 weeks of age, and others that received a period of monocular deprivation (MD). Gaze responses were observed to all stimuli in normal kittens at between 25–30 days of age and striking responses occurred on the same day or the next. Despite slow acquisition of spatial vision in the dark reared kittens over 3 months, they were able to follow and even strike at moving visual stimuli within a day of their initial exposure to light. By contrast, for a week following a period of MD, kittens showed no gaze or striking responses to moving stimuli when using their previously deprived eye. The very different profiles of acquisition of visuomotor skills and spatial vision in visually deprived kittens point to a dissociation between the neuronal populations that support these functions.

Photoprotection is regulated by light-independent CO2 availability

Photosynthetic algae cope with suboptimal levels of light and CO2. In low CO2 and excess light, the green alga Chlamydomonas reinhardtii activates a CO2 Concentrating Mechanism (CCM) and photoprotection; the latter is mediated by LHCSR1/3 and PSBS. How light and CO2 signals converge to regulate photoprotective responses remains unclear. Here we show that excess light activates expression of photoprotective and CCM-related genes and that depletion of CO2 drives these responses, even in total darkness. High CO2 levels, derived from respiration or impaired photosynthetic fixation, repress LHCSR3 and CCM genes while stabilizing the LHCSR1 protein. We also show that CIA5, which controls CCM genes, is a major regulator of photoprotection, elevating LHCSR3 and PSBS transcript accumulation while inhibiting LHCSR1 accumulation. Our work emphasizes the importance of CO2 in regulating photoprotection and the CCM, demonstrating that the impact of light on photoprotection is often indirect and reflects intracellular CO2 levels.

Vision-Less Sensing for Autonomous Micro-Drones

This work presents a concept of intelligent vision-less micro-drones, which are motivated by flying animals such as insects, birds, and bats. The presented micro-drone (named BAT: Blind Autonomous Tiny-drone) can perform bio-inspired complex tasks without the use of cameras. The BAT uses LIDARs and self-emitted optical-flow in order to perform obstacle avoiding and maze-solving. The controlling algorithms were implemented on an onboard micro-controller, allowing the BAT to be fully autonomous. We further present a method for using the information collected by the drone to generate a detailed mapping of the environment. A complete model of the BAT was implemented and tested using several scenarios both in simulation and field experiments, in which it was able to explore and map complex building autonomously even in total darkness.

A Theology of Paradoxes

Why does God’s Spirit grant the gift of faith to some but not to others? Erasmus solved the dilemma by admitting minimal freedom to the human side, a wrong use of free choice is to be blamed. This is the way of maintaining credibility in the justice of God. Luther’s solution to the dilemma was a distinction between the concepts of “the revealed God,” Deus revelatus, and of “the hidden God,” Deus absconditus. On the notitia level, i.e. in regard to knowing who is elected, we are in total darkness; it is a secret of the hidden majesty. We are restricted to the usus level of election, i.e. to revelation which says that God wills everyone to be saved. God’s will does not follow any human logic of justice, God’s will itself is the norm for itself and cannot be subjected to any rule outside itself. Asking why God does what he does is a concern arising from religious pride; the sovereignty of the divine will utterly annihilates speculation about any grounds for bargaining with God. Luther follows the paradigm of “the theology of the cross”: Anyone who has become “desperate about him/herself” is, paradoxically, already in the state of grace. This paradox brings about certainty of salvation: God has taken the question of salvation completely “outside ourselves” into his hands, this results in peace in the scruples of salvation, the believer is liberated from “the pestilence of uncertainty.” Luther prefers the Biblical term “election” to the philosophical concept “predestination.”

The Nocturnal Ovipositon Behavior of Chrysomya megacephala (Diptera: Calliphoridae) in Brazil and Its Forensic Implications

Chrysomya megacephala (Fab. 1794) (Diptera: Calliphoridae) is a very important species for forensic entomology, mainly contributing estimations of the postmortem interval (PMI) in judicial investigations. There are some doubts about the nocturnal oviposition of these flies, which could lead to errors in the PMI calculation. This study aimed to monitor the nocturnal oviposition behavior of this species through four experimental conditions carried out in laboratory. Ten cages, each containing five males and females (n = 100), were kept in a fume hood and subjected to total darkness or to artificial light for 11 consecutive hours. Two verifications were performed to determine whether the females deposited eggs on the substrate of ~20 g of chicken gizzards per cage. The first verification occurred at 9:00 pm in nocturnal experiments and at 09:00 am in diurnal experiments. The second verification occurred at 05:00 am in nocturnal experiments and at 05:00 pm in diurnal experiments. Each experiment lasted 5 d. Chrysomya megacephala deposited eggs at night under artificial light and in total darkness, but the amount of eggs was significantly lower when compared with the daytime experiments in dark conditions and under natural light. Oviposition occurred when the average temperature was around 25°C (± 2°C) and relative humidity around 73% (± 6%). Night oviposition is a possibility which should not be ruled out. Thus, future experiments are recommended.

Thomas Hardy's Groundwork

Thomas Hardy strategically exposes what he calls the “groundwork” of his fictional worlds in scenes depicting blizzards or total darkness that scrub away all points of orientation. When Hardy reveals the empty field—”forms without features”—within which the details of the novel take shape, he aims to investigate the ontological, rather than epistemological or aesthetic, questions raised by novelistic realism. By tracing Hardy's groundwork through several novels, primarily Far from the Madding Crowd (1874), The Return of the Native (1878), and Tess of the d’Urbervilles (1891), the essay shows that Hardy's vexed relation to the realist tradition arises out of the metaphysical paradoxes endemic to novelistic mimesis.