Abstract: A virtual reality system for quantifying functional visual capabilities of a user at varying assessment conditions (e.g., varying light, contrast, color conditions), using a head-mountable display. In addition to the high relevance to users with optical conditions, the present embodiments can lead to rapid and simple measurements within the controlled and reproducible testing conditions that virtual reality can offer. The virtual environment system can obtain a selection of a task to be performed. During execution of the task, a virtual environment optical setting (e.g., a modified lighting setting in the virtual environment display) can be dynamically modified. The user can interact with the objects during execution of the task, which can provide an insight into functional visual capabilities of the user. After completion of the task, an output can be generated that quantifies a functional visual capability of the user during execution of the task.

Abstract: Novel pyridine and pyrazine derivatives of the formula ##STR1## wherein R.sup.4 is 3-pyridyl, 3-pyridyl-1-oxide, 2-pyrazinyl, 2-pyrazinyl-1-oxide, 2-pyrazinyl-4-oxide or 2-pyrazinyl-1,4-dioxide, and R, R.sup.1, R.sup.2 and R.sup.3 are as hereinafter set forth, processes for their preparation, fungicidal compositions containing said compounds, and methods for the use of such compounds or compositions for combatting fungi in agriculture and in horticulture are disclosed. Novel starting materials and fungicidal active substances of the formula ##STR2## wherein R.sup.4' is 3-pyridyl or 2-pyrazinyl, and R and R.sup.1" as hereinafter set forth, which are used for the preparation of the compounds of formula I, and their N-oxides, as well as fungicidal compositions containing these compounds as the active substance, are also described.

Abstract: Novel pyridine, pyrazine and pyrimidine derivatives of the formula ##STR1## wherein R, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as hereinafter set forth, and acid addition salts thereof, processes for their preparation, fungicidal compositions containing these compounds as the active ingredient as well as the use of such compounds or compositions for the control of fungi in agriculture and in horticulture are disclosed.

Abstract: Pyridine and pyrazine compounds of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as hereinafter set forth and acid addition salts of these compounds, processes for their preparation, fungicidal compositions containing these compounds as the active ingredients and methods for the use of such compounds or compositions for combating fungi in agriculture and horticulture are disclosed.

Abstract: Novel pyridine and pyrazine derivatives of the formula ##STR1## wherein R.sup.4 is 3-pyridyl, 3-pyridyl-1-oxide, 2-pyrazinyl, 2-pyrazinyl-1-oxide, 2-pyrazinyl-4-oxide or 2-pyrazinyl-1,4-dioxide, and R, R.sup.1, R.sup.2 and R.sup.3 are as hereinafter set forth, processes for their preparation, fungicidal compositions containing said compounds, and methods for the use of such compounds or compositions for combatting fungi in agriculture and in horticulture are disclosed. Novel starting materials and fungicidal active substances of the formula ##STR2## wherein R.sup.4' is 3-pyridyl or 2-pyrazinyl, and R and R.sup.1" as hereinafter set forth, which are used for the preparation of the compounds of formula I, and their N-oxides, as well as fungicidal compositions containing these compounds as the active substance, are also described.

Abstract: 1,3-Dioxolane derivatives of the formula ##STR1## wherein R is hydrogen or C.sub.1-4 -alkyl, and acid addition salts of these compounds, a process for their preparation, fungicidal compositions containing these compounds as the active ingredient and methods for the use of such compounds or compositions for combatting fungi in agriculture and in horticulture are disclosed.

Abstract: N-alkynylanilides, a process for their preparation, fungicidal compositions containing the N-alkynylanilides as the active ingredient and methods for the use of such compounds or compositions for combatting plant fungi are disclosed.