Belar karl (17 risultati)

Hardcover. Condizione: Gut. 412 S., m. Abb. Guter Zustand. Bibliotheksexemplar mit Stempeln und Signatur auf Einband. Sonst Seiten sauber. Sprache: Deutsch Gewicht in Gramm: 1215.

Hardcover-Großformat. Condizione: Gut. Mit 280 Abbildungen, 412 Seiten; Der Erhaltungszustand des hier angebotenen Werks ist trotz seiner Bibliotheksnutzung sehr sauber. Es befindet sich neben dem Rückenschild lediglich ein Bibliotheksstempel im Buch; ordnungsgemäß entwidmet. Leichte altersbedingte Anbräunung des Papiers. Sprache: Deutsch Gewicht in Gramm: 1110.…

8°. 8 Tafeln, 76 Abb. im Text, S. (359)-484. Original-Broschur (leicht fleckig und wasserrandig, kleine Randläsuren). Die ersten 9 Bl. geringfügig wasserrandig. Sonst innen sauber und gut erhalten. Sprache: Deutsch.

Softcover. Originalbroschur gr. 8° 402-407 Seiten. m. 13 Textfiguren.l. ausgeschiedenes Bibliotheksexemplar. etwas angerändert und berieben. leicht knittrig, gebräunt. sehr guter Zustand. Sonderabdruck aus den Verhandlungen des V. Internationalen Kongresses für Vererbungswissenschaft Berlin 1927. Supplementband I der Zeitschrift für induktive Abstammungs- und Vererbungslehre 1928. in deutscher Sprache. …

Softcover. Originalbroschur 4° 717-723 SS. ausgeschiedenes Bibliotheksexemplar. m. Querknick. angerändert, knittrig, eselsohrig und berieben. gebräunt. Sonderabdruck aus Die Naturwissenschaften", 13. Jahrgang, Heft 34. in deutscher Sprache.

Gr.-8°. 262 Abb. und 3 Tab. im Text, 1 Bl. 420 S. Unbeschnittene Original-Broschur. Sehr sauber und gut erhalten. Sonderabdruck aus "Ergebnisse und Fortschritte der Zoologie", 6. Band. Sprache: Deutsch.

Hardcover. Condizione: Very Good. No Jacket. 1st Edition. First separate edition. Pp. 359 484; 8 plates; 76 figs. Contemporary cloth-backed boards. Very Good. 'Belar next studied the mechanism of mitosis in the cells of higher plants and animals, particularly the formation and activity of the achromatic apparatus and its function in the separation of the chromosomes. His work was based on live observation of dividing cells, primarily spermatocytes of a grasshopper (Chorihippus) and mitosis in the hair cells of the anthers of the spiderwort, Tradescantia. In the spindle he distinguishes chromosomal fibers that are attached at one end to the centromere of the chromosomes and at the other end to the spindle poles. These fibers shorten considerably during anaphase and thus pull the chromosomes toward the spindle poles. The other component is the middle region of the spindle, which connects the two poles and in araphase lengthens and pushes the spindle poles further apart, thus aiding the further separation of the chromosomes attached to the poles. The action of the middle region was suggested by experiments in which dividing cells were put into hypertonic solutions. In this treatment the cytoplasm shrinks due to loss of water, finally forming a thin layer around the spindle. The spindle, on the other hand. lengthens considerably, particularly in anaphase cells. and frequently gets bent on itself because it meets the resistance of the reduced cytoplasm. Belar's findings and conclusions formed the basis of later discussions of the nature of mitosis. The reality of the spindle fibers and the longitudinal structure of the central spindle was in doubt for twenty years because, though quite conspicuous in fixed preparations, they cannot be seen in living cells. Belar supported their existence by indirect observations and conclusions. Only in 1953 was Inoue able to demonstrate their existence in living cells by means of polarization microscopy and to show the fibrous nature of the middle region. Since that time the picture has become more concrete by the employment of the electron microscope, which has shown both chromosomal fibers and central spindle fibers, and by biochemical studies of the behavior of tubulins, the main protein component of the spindle. The fibers of the middle region, which extend from one pole to the other, lengthen during anaphase, as Belar envisioned; but it is now generally agreed that sliding of fibers against each other is probably the source of spindle elongation. . . . Belar had a very sharp and critical mind, and was famous and feared for his severe criticisms. He had little patience with inexact technique and sloppy thinking, and had the courage to attack even the most influential biologists of his time for instance. Rudolf Flick, the head of the Anatomy Department in Berlin; the protozoologist Franz Doflein; the zoologist Alfred Kühn; and even his supervisor Hartmann, who complains about Belar's sharply critical remarks in the foreword he wrote for Belar's monograph on protozoan nuclei. But Belar used the same ruthless criticism against his own work and his earlier publications. . . . Belar's significance in the history of cytology consists in the fact that he mercilessly destroyed many assumptions that were based on poor observations and wrong interpretations, and replaced them with carefully considered and solidly based ideas. Most of these are still valid, though superior methods have made them more concrete' (Ernst Caspari, 'Karl Belar', Dictionary of Scientific Biography). 'He was invited as a guest lecturer at California Institute of Technology by T.H. Morgan and worked there between 1929 and 1931. Just before his return to Berlin he was killed in a car accident in the Mojave desert near Victorville where he had visited so as to paint a landscape.'.…

Condizione: Gut. Sonderdruck. 420 S. : Mit 263 Abb. u. 3 Tab. im Text ; Sauberes Exemplar ohne Einträge. Sprache: Deutsch Gewicht in Gramm: 1100 Gr.-8°, schwarzer Halbleinen mit mont. Rückenschild.

Gr.8°, 420 S., zahlr. Abb., Halbleinen d. Zeit mit marmor. Überzugspapier, Einbd.-Kanten berieben, Vorsatz mit Besitzereintrag, sonst innen sehr sauber.

Pamphlet. Condizione: Collectible; Very Good. Prompt Shipment, shipped in Boxes, Tracking PROVIDEDOffprint. Very good condition. First separate edition. Offprint. Original wrappers. Spine is splitting. Reprinted from Archiv fur Protistenkunde, Vol. 53, 1926, pp. 312-325. Science. Biology.*.

Die Naturwissenschaften, 15/36. - Berlin, 9. September 1927, 4°, pp.721-752, orig. Broschur; St. a. Umschlag. First Edition! Karl Franz Josef Belar (1895-1931) Austrian microbiologist. He was among the first to demonstrate that cell division by protists involved mitosis.

n.d., 124 pp., 8 plates and ill. (bibl.ex.) b534.

Condizione: Gut. XIV, 1425 S. : Miit 493 Abb. + 1 Farbtafel; X, 1219 S. : Mit 358 Abb.; Einbände etwas bestoßen und lichtrandig, Titel und wenige Seiten fleckig, keine Einträge. Sprache: Deutsch Gewicht in Gramm: 2550 26 cm, grüner Halbleinen mit Rückentitel.

Leather Bound. Condizione: New. Language: German. Language: German. Presenting an Exquisite Leather-Bound Edition, expertly crafted with Original Natural Leather that gracefully adorns the spine and corners. The allure continues with Golden Leaf Printing that adds a touch of elegance, while Hand Embossing on the rounded spine lends an artistic flair. This masterpiece has been meticulously reprinted in 2025, utilizing the invaluable guidance of the original edition published many years ago in 1928. The contents of this book are presented in classic black and white. Its durability is ensured through a meticulous sewing binding technique, enhancing its longevity. Imprinted on top-tier quality paper. A team of professionals has expertly processed each page, delicately preserving its content without alteration. Due to the vintage nature of these books, every page has been manually restored for legibility. However, in certain instances, occasional blurriness, missing segments, or faint black spots might persist. We sincerely hope for your understanding of the challenges we faced with these books. Recognizing their significance for readers seeking insight into our historical treasure, we've diligently restored and reissued them. Our intention is to offer this valuable resource once again. We eagerly await your feedback, hoping that you'll find it appealing and will generously share your thoughts and recommendations. Lang: - German, Pages:- 432, Print on Demand. If it is a multi-volume set, then it is only a single volume. We are specialised in Customisation of books, if you wish to opt different color leather binding, you may contact us. This service is chargeable. Product Disclaimer: Kindly be informed that, owing to the inherent nature of leather as a natural material, minor discolorations or textural variations may be perceptible. Explore the FOLIO EDITION (12x19 Inches): Available Upon Request. 432 432.…

LeatherBound. Condizione: NEW. BOOKS ARE EXEMPT FROM IMPORT DUTIES AND TARIFFS; NO EXTRA CHARGES APPLY. Leatherbound edition. Condition: New. Leather Binding on Spine and Corners with Golden leaf printing on spine. Bound in genuine leather with Satin ribbon page markers and Spine with raised gilt bands. Pages: 228. A perfect gift for your loved ones. Reprinted from 1922 edition. NO changes have been made to the original text. This is NOT a retyped or an ocr'd reprint. Illustrations, Index, if any, are included in black and white. Each page is checked manually before printing. As this print on demand book is reprinted from a very old book, there could be some missing or flawed pages, but we always try to make the book as complete as possible. Fold-outs, if any, are not part of the book. If the original book was published in multiple volumes then this reprint is of only one volume, not the whole set. IF YOU WISH TO ORDER PARTICULAR VOLUME OR ALL THE VOLUMES YOU CAN CONTACT US. Resized as per current standards. Sewing binding for longer life, where the book block is actually sewn (smythe sewn/section sewn) with thread before binding which results in a more durable type of binding. Volume V1-2 Language: German Pages: 228 Volume V1-2.…

Leather Bound. Condizione: New. Language: German. Language: German. Presenting an Exquisite Leather-Bound Edition, expertly crafted with Original Natural Leather that gracefully adorns the spine and corners. The allure continues with Golden Leaf Printing that adds a touch of elegance, while Hand Embossing on the rounded spine lends an artistic flair. This masterpiece has been meticulously reprinted in 2025, utilizing the invaluable guidance of the original edition published many years ago in 1922. The contents of this book are presented in classic black and white. Its durability is ensured through a meticulous sewing binding technique, enhancing its longevity. Imprinted on top-tier quality paper. A team of professionals has expertly processed each page, delicately preserving its content without alteration. Due to the vintage nature of these books, every page has been manually restored for legibility. However, in certain instances, occasional blurriness, missing segments, or faint black spots might persist. We sincerely hope for your understanding of the challenges we faced with these books. Recognizing their significance for readers seeking insight into our historical treasure, we've diligently restored and reissued them. Our intention is to offer this valuable resource once again. We eagerly await your feedback, hoping that you'll find it appealing and will generously share your thoughts and recommendations. Lang: - German, Vol:- Volume V1-2, Pages:- 228, Print on Demand. If it is a multi-volume set, then it is only a single volume. We are specialised in Customisation of books, if you wish to opt different color leather binding, you may contact us. This service is chargeable. Product Disclaimer: Kindly be informed that, owing to the inherent nature of leather as a natural material, minor discolorations or textural variations may be perceptible. Explore the FOLIO EDITION (12x19 Inches): Available Upon Request. Volume V1-2 228 228.…

LeatherBound. Condizione: New. BOOKS ARE EXEMPT FROM IMPORT DUTIES AND TARIFFS; NO EXTRA CHARGES APPLY. Leatherbound edition. Condition: New. Leather Binding on Spine and Corners with Golden leaf printing on spine. Bound in genuine leather with Satin ribbon page markers and Spine with raised gilt bands. Pages: 436. A perfect gift for your loved ones. Reprinted from 1926 edition. NO changes have been made to the original text. This is NOT a retyped or an ocr'd reprint. Illustrations, Index, if any, are included in black and white. Each page is checked manually before printing. As this print on demand book is reprinted from a very old book, there could be some missing or flawed pages, but we always try to make the book as complete as possible. Fold-outs, if any, are not part of the book. If the original book was published in multiple volumes then this reprint is of only one volume, not the whole set. IF YOU WISH TO ORDER PARTICULAR VOLUME OR ALL THE VOLUMES YOU CAN CONTACT US. Resized as per current standards. Sewing binding for longer life, where the book block is actually sewn (smythe sewn/section sewn) with thread before binding which results in a more durable type of binding. Language: German Pages: 436.…