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Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge Volume 40-41 by American Philosophical Society - Paperback
149.10 درهم

Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge Volume 40-41 by American Philosophical Society - Paperback

كن أول من يقيِّم هذا المنتج 

149.10 درهم 

  - ستوفر -149.10 درهم
الأسعار تشمل ضريبة القيمة المضافة  التفاصيل
الشحن مجاني التفاصيل
رقم ال ISBN
9781130267921
الفئات
تاريخ
الكاتب
American Philosophical Society
الناشر
Rarebooksclub.com
الوصف:

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ... a fusion of some of the intra-nuclear globules; and a considerable portion of the complicated karyokinetic figures, with their centrosomes, pseudosomes and dictyosomes, appear to be ...

تشحن من الولايات المتحدة
اشحن الى دبي (تغيير المدينة)
التوصيل خلال السبت ١٤ يوليو - الأحد ١٥ يوليو الي دبي

حالة السلعة:
جديدة
البائع:
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معلومات المنتج

  •  

    المواصفات

    رقم ال ISBN
    9781130267921
    الفئات
    تاريخ
    اللغات
    الانجليزية
    الرقم المميز للسلعة
    2724353188311
    المؤلفين
    الكاتب
    American Philosophical Society
    رقم ال ISBN
    9781130267921
    الفئات
    تاريخ
    اللغات
    الانجليزية
    الرقم المميز للسلعة
    2724353188311
    المؤلفين
    الكاتب
    American Philosophical Society
    المؤلفين
    الناشر
    Rarebooksclub.com
    معلومات تقنية
    غلاف الكتاب
    غلاف عادي
    اللغات والبلدان
    لغة الكتاب
    الانجليزية
    إقرأ المزيد
  •  

    الوصف:

    This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ... a fusion of some of the intra-nuclear globules; and a considerable portion of the

    This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ... a fusion of some of the intra-nuclear globules; and a considerable portion of the complicated karyokinetic figures, with their centrosomes, pseudosomes and dictyosomes, appear to be the logical as well as the actual consequence of the continuance of this process." The question of reduction is not entered upon in much detail. From the nucleus of the resting spermatocyte, however, are shown to arise ten chromosomes of dumbbell-shape. These become arranged in the equatorial plate with the transverse constriction in the plane of the equator. This division consequently is apparently reducing. No longitudinal split is. shown and the second spermatocyte division is very inadequately worked out. b. Commentary. Although agreeing with many points in the description of Gilson concerning the metamorphosis of the spermatids of Oniscus, my observations do not entirely coincide with his account of the earlier stages. The statement defining the most favorable season for obtaining preparations of the first stage does not hold true for the locality of Philadelphia, for I have sectioned material collected during every month of the year, except December and January, and have not found one month to be preferred over another with regard to the abundance of any particular stage. I feel sure that the function of replacing the evacuated elements which he ascribes to the spermatogonia is the true one, but that their multiplication takes place by direct division I am unable to believe. On the one hand the weight of the evidence of modern research is against the occurrence normally of amitotic division in the germ cells. Moreover the work of vom Rath on Astacus creates a strong probability that the phenomena are similar in Oniscus. I have never seen amitotic division in the germ.

    خصائص المنتج:
    • الفئات: تاريخ
    • غلاف الكتاب: غلاف عادي
    • لغة الكتاب: الانجليزية
    • الكاتب: American Philosophical Society
    • الناشر: Rarebooksclub.com
    • رقم ال ISBN: 9781130267921
    • عدد الصفحات: 224
    • لأبعاد (الارتفاع*العرض*العمق): 9.69 x 7.44 x 0.47 inches
 

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