Per Halkjaer Nielsen Books

FISH handbook for biological wastewater treatment

By Per Halkjaer Nielsen, Hilde Lemmer, Holger Daims

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Microbial Ecology of Activated Sludge

By Per Halkjaer Nielsen, Robert Seviour

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FISH Handbook for Biological Wastewater Treatment

By Tugba Olmez Hanci, Per Halkjaer Nielsen, Idil Arslan Alaton, Hilde Lemmer, Holger Daims

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Experimental Methods in Wastewater Treatment

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Over the past twenty years, the knowledge and understanding of wastewater treatment has advanced extensively and moved away from empirically based approaches to a fundamentally-based first principl...

Community Analysis of Activated Sludge and Anaerobic Digesters with FISH and Amplicon Sequencing

By Simon McIlroy, Per Halkjaer Nielsen, Holger Daims

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Metodos Experimentales para el Tratamiento de Aguas Residuales

By C. M. Lopez Vazquez, Per Halkjaer Nielsen, Mark C. M. Van Loosdrecht

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.