Colorimetric Detection of Acidic Pesticides in Water

A water-stable, porphyrin-based metal-organic framework (MOF) produces a distinct colour change in response to acids’ pKa and concentrations. This colour change is associated with the protonation of the N-atoms within...

Revision of the Asian pseudoscorpion genus Tullgrenius Chamberlin, 1933 (Pseudoscorpiones: Atemnidae: Miratemninae), a tale of intraspecific variation

The Asian pseudoscorpion genus Tullgrenius Chamberlin, 1933 is revised. A neotype is designated for Tullgrenius indicus Chamberlin, 1933, based on topotype material and a detailed description of its male is provided. Two new synonymies are proposed: Tullgrenius vachoni Murthy, 1962 syn. nov. and Tullgrenius orientalis Sivaraman, 1980 syn. nov. = T. indicus. Two distinct colour morphs of T. indicus are recognized: a brown and black morph. Supplementary descriptions and illustrations for Tullgrenius afghanicus Beier, 1959 and Tullgrenius compactus Beier, 1951 are detailed with current distribution of all the known Tullgrenius spp..

Direct evidence for distinct colour origins in ROY polymorphs

Alternative colour origins in ROY polymorphs are conclusively determined for the first time, using high-pressure diffraction and hybrid DFT.

Organoleptic Analysis Of The Honeycomb Cake (Kue Sarang Semut)

The Honeycomb Cake or Caramel Cake or widely known in Indonesia as "Kue Sarang Semut" is a type of cake that preferred by many people and has a distinct colour, texture and aroma. Some of its main ingredients are caramel and wheat flour. But the caramel-making is generally sugarcane-based, and the flour is still usually from wheat, which its availability is always depended on import traffic and its import activity is now increasing. Therefore, it is necessary to research the cake's organoleptic test using different types of sugar and the flour substitution of tofu dregs. This research is classified as a pure experiment and conducted in two stages and uses Completely Randomised Design, which is consisted of four treatments. The first stage uses four different types of sugar (granulated sugarcane, aren sugar, palm sugar, and rock sugar) and the second stage is four types of tofu dregs flour amount (0%, 15%, 30%, and 45%) used, with three-time repetition. The obtained data later tabulated into a table and will be examined using Analysis of Variance test. If there is any significant difference, the Duncan test will then applied. This research concludes that the different types of sugar significantly affect the colour and aroma quality. Furthermore, the amount of the wheat flour substitute of tofu dregs flour significantly affect the volume, colour, aroma, chewiness texture, hollow texture, and taste satisfaction. The best treatment of the Honeycomb Cake is obtained from the usage of pam sugar and 15% amount of tofu dregs flour.

First photographic evidence of the Asiatic Golden Cat Catopuma temminckii Vigors & Horsfield, 1827 (Mammalia: Carnivora: Felidae) in Sakteng Wildlife Sanctuary, Bhutan

The Asiatic Golden Cat Catopuma temminckii is among Asia’s least studied wild felids. We report the first photographic evidence of its presence in Sakteng Wildlife Sanctuary, eastern Bhutan, where it was recorded above 3,000m. The photographs show three distinct colour morphs, viz., golden, buff brown, and melanistic. The main threat to the species in the sanctuary appears to be habitat loss due to increasing developmental activities and land use change. Future studies are needed to determine the conservation status of Asiatic Golden Cats in Sakteng Wildlife Sanctuary.

Revision of the Neotropical hoverfly genus Peradon Reemer (Diptera, Syrphidae, Microdontinae)

The species of the Neotropical hoverfly genus Peradon Reemer, 2013 are revised, based on morphological characters with aid of mitochondrial DNA barcodes. The resulting number of valid species is increased to 31, of which the following seven are described as new: P. ballux Reemer, sp. nov., P. brevis Reemer, sp. nov., P. costaricensis Reemer, sp. nov., P. notialus Reemer, sp. nov., P. palpator Reemer, sp. nov., P. pompiloides Reemer, sp. nov., and P. surinamensis Reemer, sp. nov. Two new synonymies are established: Microdon langi Curran, 1925, syn. nov. and Microdon flavomarginatum Curran, 1925, syn. nov. are both junior synonyms of Mulio bidens Fabricius, 1805. A neotype is designated for Microdon diaphanus Sack, 1921. This neotype, which has been reared from an ant nest, also represents the first case of a larval record for this genus. In some species, most notably in P. bidens (Fabricius) and P. normalis (Curran), discrete and distinct colour morphs are recognized, with strongly differing colouration of wings and abdomen.

I Walk With Vanessa: A Story About a Simple Act of Kindness by Kerascoët

Kerascoët. I Walk With Vanessa: A Story About a Simple Act of Kindness. Random House Children’s Books, 2018. This is a wordless picture book from French illustrators, Kerascoët. This husband and wife duo, Marie and Sébastien solely illustrate, without the use of text, the ability to combat bullying in modern society. They accomplish this difficult task by placing emphasis on the characters’ emotions through the use of distinct colour throughout the images, clearly depicting the story’s message. Because there are no words, this amazing resource provides students with the ability to interpret the book individually, creating unique perspectives such as an idea, "who else needs help other than Vanessa?" This book provides fresh insight into how society can unite together by creating a positive chain reaction when faced with bullying. Throughout the illustrations, this team accomplished this task extremely well, by providing the audience with diverse characters, creating a sense of belonging. This allows the reader to view the characters as if they were looking at their own reflection, seeing into their lives, therefore enabling them to relate to the book. With this, I truly believe that it is essential for children's books to act either as a window or a mirror for children. Overall, I feel that this book is ideal for a target audience of pre-kindergarten to grade two. The drawings are simplistic, with few details, allowing children to predict the storyline easily, leaving a thorough investigation of the book. I cannot wait for students to "read" this book to me. Highly recommended: 4 out of 4 starsReviewer: Terri Beach

Cost-effective approach to detect Cu(ii) and Hg(ii) by integrating a smartphone with the colorimetric response from a NBD-benzimidazole based dyad

A new optical chemosensor N1 was designed and synthesized by condensing 4-chloro-7-nitrobenzofurazan with 2-aminophenylbenzimidazole. In CH3OH : H2O (1 : 1, v/v) medium, sensor N1 exhibited high selectivity and sensitivity towards Cu2+ and Hg2+ ions by showing a distinct colour change from pale yellow to pink due to the internal charge transfer occurring between the sensor N1 and the Cu2+/Hg2+ ions upon complexation in 1 : 1 stoichiometry.

Circular Polarization and Wavelength Selective Gratings Based on Holographic Cholesteric Liquid Crystal Templates

Refilling cholesteric liquid crystal (CLC) template gratings with circular polarization, wavelength selectivity, and dual operation mode are first demonstrated. The gratings with template and nontemplate regions are obtained through the two-beam interfering photo-polymerization, washing-out, and refilling procedure. The refilling CLC has different chiral handedness (left or right) and reflection band (at green and red regions). When the wavelength of a probe beam is within the refilled CLC reflection band of the nontemplate region, the device works as an amplitude grating since the sample in the template and nontemplate regions reflects distinct colour region. In addition, the diffraction intensity of the grating can be electrically controlled. Therefore, this CLC-based device can be potentially used in controllable diffraction elements in optics.

New species of Heteropterna Skuse and Keroplatus Bosc (Diptera: Keroplatidae) become the second records of this family for Cuba

Two new species of Keroplatini (Diptera: Keroplatidae: Keroplatinae), Heteropterna (Heteropterna) garae n. sp. and Keroplatus maxi n. sp. are described from Cuba, the second record of the family from this territory since Matile’s paper in 1977. Heteropterna garae n. sp. is characterized by the last three flagellomeres being a silvery white colour (the last with a light brown apical border), the wings with a distinct colour pattern, and the unique shape of the terminalia and gonostylus. Keroplatus maxi n. sp. is principally yellow with almost no marks except for the particular pattern of stripes on the dorsal part of thorax. The wings have a slight pale yellowish tint with no pattern of coloured spots, and the gonostylus is characteristically shaped. A key to Neotropical Heteropterna and Keroplatus species is provided.