Well-Lit: A programmable and customizable assistant for manual multi-well plate pipetting

A very large number of biology and biochemistry laboratory protocols require transferring liquid aliquots from individual containers into individual wells of a multi-well plate, from plates to individual containers, or from one plate to another. Doing this by hand without errors, such as skipping wells, placing two samples in the same well, or swapping sample locations, especially when using plates with 96 wells or more, is difficult and requires enormous operator focus and/or a tedious manual error checking system. We present here a device built to facilitate error-free pipetting of samples from individual barcoded tubes to a multi-well plate or between multi-well plates (both 96 and 384 wells are supported). The device is programmable, modular and easily customizable to accommodate plates with different form-factors, and different protocols. The main components are only a 12.3" touch screen, a small form-factor PC, and a barcode scanner, combined with custom-made parts can be easily fabricated with a laser cutter and a hobby-grade 3D printer. The total cost is between approximately US$550 and US$600, depending on the configuration.

Sangam Landscape and its Theological Soctrines

This article is about the primary deities worshiped by the Pentateuch and the system of worship of those deities, as well as the reasons for which these rituals are included. Furthermore, this article does not show all the gods worshiped by the Pentateuch, but only in a small form the five mentioned by Tolkappiahar as the Lord of the Pentateuch. So this article is set in the context of the meaning of theology, the need for theology, and the worship of the five gods. Theology in general was initially the rites of man who feared nature. Innumerable gods have appeared in every department over the course of the day. However, this article only deals with the deities, including Murugan, Thirumal, Indra, Varuna and Koravai, who are considered to be the foremost.

Helix lutescens (Gastropoda, Pulmonata, Helicidae) is a new introduced species in malacofauna of the Moscow Region

Three small but abundant in specimens isolated colonies of Helix lutescens have been found in the eastern part of Moscow City in the central part of European Russia for the first time. This is an easternmost known colony of the species. Differences from the related and similar small form of H. pomatia are given and discussed.

Design and Implementation Scheme of QSFP28 Optical Transceiver for Long-Reach Transmission Using PAM4 Modulation

A quad, small form-factor pluggable 28 Gbps optical transceiver design scheme is proposed. It is capable of transmitting 50 Gbps of data up to a distance of 40 km using modulation signals with a level-four pulse-amplitude. The proposed scheme is designed using a combination of electro-absorption-modulated lasers, transmitter optical sub-assembly, low-cost positive-intrinsic-native photodiodes, and receiver optical sub-assembly to achieve standard performance and low cost. Moreover, the hardware and firmware design schemes to implement the optical transceiver are presented. The results confirm the effectiveness of the proposed scheme and the performance of the manufactured optical transceiver, thereby confirming its applicability to real industrial sites.