The Lecithans: Their Function in the Life of the Cell (Classic Reprint)
Idioma: inglés
Editorial: Forgotten Books, 2024
- Tapa blanda
- Nuevo
Librería: Forgotten Books, London, Reino UnidoForgotten Books
Vendedor de IberLibro desde 2 de junio de 2021
Condición: Nuevo
EUR 15,74
Cantidad disponible: Más de 20 disponibles
Añadir al carritoDescripción del artículo del vendedor
Print on Demand. This book delves into the mysterious world of lecithans, organic compounds vital to living organisms. The author's meticulous research sheds light on their physical properties and chemical behavior. Their ability to form emulsions reminiscent of living protoplasm and their interactions with ions hint at their profound role in cellular processes. The discovery that different lecithans, such as brain lecithin and kephalin, display distinct compositions underscores their diverse functions. Moreover, the author introduces a reliable method for quantifying lecithans, opening up new avenues for studying their metabolism and physiological impact. The significance of this work lies in its comprehensive exploration of lecithans, revealing their essential nature for life and providing a valuable tool for investigating their contributions to health and disease. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book.…
N° de ref. del artículo 9781333329082_0
- Título
- The Lecithans: Their Function in the Life of the Cell (Classic Reprint)
- Autor
- Waldemar Koch
- Editorial
- Forgotten Books
- Año de publicación
- 2024
- Estado
- New
- Tipo de libro
- print-on-demand item
- Encuadernación
- Paperback
- Idioma
- inglés
- ISBN 10
- 1333329083
- ISBN 13
- 9781333329082
- Catálogos de vendedores
- Chemistry
The ash left on the incineration Of tissues obtained from various parts Of the body, especially the brain, has long been known to contain phosphorus. Of the chemical combination in which this phosphorus was present in the original tissues nothing was known until Gobleyl carefully studied an organic phosphorus-containing body, which he isolated from eggs and called lecithin. He Obtained as Splitting products glycero phosphoric acid and some Of the fatty acids. Diaconow2 continued this work at the suggestion of Hoppe Seyler, and isolated as splitting products glycerophosphoric acid, stearic and oleic acids, and a base which he identified with Baeyer's neurin and the neurin Obtained by Liebreich3 from his protagon by decomposition with barium hydrate. From the ease with which his lecithin could be Split up Diaconow con cluded that it was a neurin salt of distearyl glycerophosphoric acid. This View was, however, disproved by Hundeshagen4 on account of the fact that the body prepared by the union Of neurin and distearyl glycerophosphoric acid in alcohol solution would not give the characteristic myelin forms, although it possessed all the other properties of lecithin. Strecker5 brought confusion into this subject by identifying the base obtained by him from lecithin with the cholin he had isolated from bile.6 Thudichum7 pointed out the difference between the body derived from bile and the base isolated from lecithin, and identified the latter as neurin by a number of analyses made with carefully purified material. In the book above referred to Thudichum also records someother important Observations. Among the large number of compounds isolated by him from the brain there are some which do not contain glycerin; as he always finds phosphorus in the form Of orthophosphoric acid, he concludes to call these bodies Phosphatids and consider them rather as derivatives Of orthophosphoric acid than glycerophosphoric acid, as previously accepted. His formulas resemble the types of the T ypentheom'e of Gerhardt and Wurtz, in leaving the exact building up of the molecule a matter of doubt. From a Study of the fatty acids in his various compounds Thudichum concludes, contrary to Diaconow, that there are no phosphatids with only one fatty acid, but that each one contains either palmitic, stearic, or mar.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
“Sinopsis” puede pertenecer a otra edición de este título.
Reseña del editor
The ash left on the incineration Of tissues obtained from various parts Of the body, especially the brain, has long been known to contain phosphorus. Of the chemical combination in which this phosphorus was present in the original tissues nothing was known until Gobleyl carefully studied an organic phosphorus-containing body, which he isolated from eggs and called lecithin. He Obtained as Splitting products glycero phosphoric acid and some Of the fatty acids. Diaconow2 continued this work at the suggestion of Hoppe Seyler, and isolated as splitting products glycerophosphoric acid, stearic and oleic acids, and a base which he identified with Baeyer's neurin and the neurin Obtained by Liebreich3 from his protagon by decomposition with barium hydrate. From the ease with which his lecithin could be Split up Diaconow con cluded that it was a neurin salt of distearyl glycerophosphoric acid. This View was, however, disproved by Hundeshagen4 on account of the fact that the body prepared by the union Of neurin and distearyl glycerophosphoric acid in alcohol solution would not give the characteristic myelin forms, although it possessed all the other properties of lecithin. Strecker5 brought confusion into this subject by identifying the base obtained by him from lecithin with the cholin he had isolated from bile.6 Thudichum7 pointed out the difference between the body derived from bile and the base isolated from lecithin, and identified the latter as neurin by a number of analyses made with carefully purified material. In the book above referred to Thudichum also records someother important Observations. Among the large number of compounds isolated by him from the brain there are some which do not contain glycerin; as he always finds phosphorus in the form Of orthophosphoric acid, he concludes to call these bodies Phosphatids and consider them rather as derivatives Of orthophosphoric acid than glycerophosphoric acid, as previously accepted. His formulas resemble the types of the T ypentheom'e of Gerhardt and Wurtz, in leaving the exact building up of the molecule a matter of doubt. From a Study of the fatty acids in his various compounds Thudichum concludes, contrary to Diaconow, that there are no phosphatids with only one fatty acid, but that each one contains either palmitic, stearic, or mar.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
“Acerca de” puede pertenecer a otra edición de este título.
Forgotten Books
London, Reino Unido
Vendedor de IberLibro desde 2 de junio de 2021
Tarifas de envío de Reino Unido a Estados Unidos de America
| Artículo | De 5 a 10 días hábiles | De 5 a 10 días hábiles |
|---|---|---|
| Primer artículo | EUR 0,00 | EUR 0,00 |
Métodos de pago
Descripción de la tienda
Forgotten Books’ Classic Reprint Series utilizes the latest technology to regenerate facsimiles of historically important writings. Careful attention has been made to accurately preserve the original format of each page whilst digitally enhancing the quality of the aged text.
Especialidad
TradeInformación empresarial del vendedor
FB &c Ltd
Dalton House, 60 Windsor Avenue
London, Reino Unido SW19 2RR
Forgotten Books publica cientos de miles de libros raros y clásicos.
Este libro es una reproducción de una importante obra histórica. Forgotten Books utiliza tecnología de punta para reconstruir digitalmente la obra, preservando el formato original mientras repara las imperfecciones presentes en la copia envejecida. En casos raros, una imperfección en el original, como una imperfección o una página faltante, puede replicarse en nuestra edición. Sin embargo, reparamos con éxito la gran mayoría de las imperfecciones; cualquier imperfección que permanezca se deja intencionalmente para preservar el estado de tales obras históricas.
Este texto se ha restaurado digitalmente a partir de una edición histórica. Algunos errores pueden persistir, sin embargo, consideramos que vale la pena publicarlo debido al valor histórico de la obra.
La edición digital de todos los libros se puede ver en nuestro sitio web antes de la compra.
Condiciones de venta
Todos los libros se imprimen bajo demanda y se imprimirán al momento de la compra y se enviarán en nuevas condiciones. Los pedidos generalmente se envían dentro de 5 días hábiles. Si no está satisfecho con su compra (libro incorrecto / no como se describe / dañado) o si el pedido no ha llegado, es elegible para un reembolso dentro de los 30 días posteriores a la fecha de entrega estimada. Si ha cambiado de opinión sobre un libro que ha pedido, utilice el enlace Preguntar al librero para ponerse en contacto con nosotros y le responderemos en un plazo de 2 días laborables.
Derecho al desistimiento
Si es un consumidor, puede rescindir el contrato de acuerdo con lo siguiente. Por consumidor se entiende cualquier persona física que actúe con fines ajenos a su actividad comercial, empresarial, oficio o profesión.
Información sobre el derecho de desistimiento
Derecho legal de desistimiento
Tiene derecho a rescindir este contrato en un plazo de 14 días sin dar ningún motivo.
El periodo de desistimiento vencerá a los 14 días desde que usted, o un tercero que no sea el transportista e indicado por usted, adquiera la posesión física del último bien o del último lote o pieza.
Para ejercer el derecho de desistimiento, complete de forma electrónica y envíe una declaración clara en nuestro sitio web, desde "Mis compras" en "Mi cuenta". Le enviaremos sin demora un acuse de recibo de dicho desistimiento a través de un soporte duradero (por ejemplo, por correo electrónico).
Para cumplir con el plazo de desistimiento, basta con que envíe su comunicación relativa al ejercicio del derecho de desistimiento antes de que venza el periodo de desistimiento.
Efectos del desistimiento
Si rescinde este contrato, le reembolsaremos todos los pagos que hayamos recibido de usted, incluidos los gastos de envío (excepto los gastos adicionales que surjan si elige un tipo de envío que no sea el tipo de envío estándar más económico que ofrecemos).
Podemos hacer una deducción del reembolso por la pérdida de valor de cualquier bien suministrado, si la pérdida es el resultado de una manipulación innecesaria por su parte.
Efectuaremos el reembolso sin demoras indebidas y, a más tardar, 14 días después de que se nos informe de su decisión de rescindir este contrato.
Efectuaremos el reembolso utilizando el mismo medio de pago que utilizó para la transacción inicial, a menos que haya acordado expresamente lo contrario; en cualquier caso, no incurrirá en ningún cargo como resultado de dicho reembolso.
Podremos retener el reembolso hasta que hayamos recibido los bienes o hasta que nos haya presentado una prueba de que los ha devuelto, lo que ocurra primero.
Deberá devolver los bienes o entregarlos a Forgotten Books, London, United Kingdom, sin demoras indebidas y, en cualquier caso, en un plazo máximo de 14 días a partir del día en que nos comunique su desistimiento del presente contrato. El plazo se cumple si devuelve la mercancía antes de que venza el periodo de 14 días. Tendrá que asumir los gastos directos de devolución de los bienes. Usted solo es responsable de la disminución del valor de los bienes como resultado de una manipulación distinta a la necesaria para establecer la naturaleza, las características y el funcionamiento de los bienes.
Excepciones al derecho de desistimiento
El derecho de desistimiento no se aplica a lo siguiente:
- La entrega de periódicos, diarios o revistas, con la excepción de los contratos de suscripción; y
- El suministro de contenido digital que no se proporcione en un soporte tangible (por ejemplo, en un CD o DVD) si, al hacer el pedido, aceptó que podíamos empezar a entregarlo y que no podría desistir una vez iniciada la entrega.
Condiciones de envío
Ci impegniamo a ridurre al minimo il nostro impatto ambientale e a diminuire i costi di spedizione producendo e spedendo i nostri prodotti il più vicino possibile ai nostri clienti. Per gli ordini negli Stati Uniti, gli articoli vengono spediti dagli USA. Gli ordini per il Regno Unito e l’Europa vengono evasi dal Regno Unito. Gli ordini canadesi possono essere spediti dal Canada o dagli Stati Uniti, a seconda delle dimensioni dell’ordine.
Per i nostri clienti in altre regioni del mondo, ci assicuriamo che gli ordini vengano spediti dalla località più vicina disponibile per ridurre i tempi di consegna e l’impronta di carbonio. Il nostro obiettivo è consegnare i tuoi prodotti in modo efficiente, ovunque tu sia.
Ti preghiamo di notare che, in base alla dimensione dell’ordine e alla legislazione locale del tuo paese, potrebbero essere applicate tasse, dazi doganali e spese aggiuntive dal paese di destinazione. Questi costi non sono inclusi nel prezzo dell’articolo o nelle spese di spedizione. Sono a carico del cliente e devono essere pagati alla consegna.
Ti consigliamo di verificare con il tuo ufficio doganale locale per maggiori informazioni su eventuali costi prima di effettuare l’ordine. Forgotten Books non è responsabile per eventuali dazi doganali, tasse o spese sostenute.