Academia.edu no longer supports Internet Explorer.
To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser.
* Giảm phân gồm 2 lần phân bào nhưng bộ NST chỉ nhân đôi duy nhất 1 lần Các kỳ GP Những diễn biến cơ bản của NST trong giảm phân Lần phân bào I Lần phân bào II Kỳ trước-Có sự tiếp hợp của các NST kép theo từng cặp tương đồng. Sau tiếp hợp NST dần co xoắn lại.-Thoi phân bào hình thành. Màng nhân và nhân con dần tiêu biến. Các NST ở trạng thái co xoắn. Kỳ giữa NST kép co xoắn cực đại. Các NST tập trung thành 2 hàng trên mặt phẳng xích đạocủa thoi phân bào. Các NST kép tập trung thành 1 hàng trên mặt phẳng xích đạo. Kỳ sau Mỗi NST kép trong cặp NST tương đồng di chuyển theo thoi phân bào đi về 2 cực của TB. Mỗi NST kép tách nhau ra ở tâm động và đi về 2 cực của tế bào. Kỳ cuối Các NST kép dãn xoắn. Màng nhân và nhân con dần xuất hiện. Thoi phân bào tiêu biến. + Tế bào chất phân chia tạo thành 2 tế bào con có số lượng NST kép giảm đi một nửa. NST dãn xoắn. Màng nhân và nhân con dần xuất hiện. Thoi phân bào tiêu biến. +Tế bào chất phân chia tạo thành 2 tế bào con có số lượng NST đơn giảm đi một nửa. * Ý nghĩa của giảm phân: Về mặt lí luận:-Nhờ giảm phân giao tử được tạo thành mang bộ NST đơn bội (n). Thông qua thụ tinh mà bộ NST (2n) của loài được khôi phục.-Sự kết hợp 3 quá trình nguyên phân, giảm phân và thụ tinh mà bộ NST của loài sinh sản hữu tính được duy trì ổn định qua các thế hệ cơ thể. Về mặt thực tiễn: Sử dụng lai hữu tính giúp tạo ra nhiều biến dị tổ hợp phục vụ trong công tác chọn giống..
Background: Vibroacoustic therapy (VAT) uses low-frequency sound, often combined with listening to music, for therapeutic purposes. However, the impact of low-frequency vibration (LFV) on physiological functions and subjective perception is relatively unknown. Methods: We conducted a randomized cross-over study with the aim of comparing the effect of constant LFV of 40 Hz, its amplitude modulation, and the placebo condition on heart rate variability (HRV), stress perception (measured by visual analogue scales for stress) and mood (measured by UWIST Mood Adjective Check List). Results: Research experiments with various interventions (constant LFV with sound of nature (river in forest), amplitude modulation of the same LFV with sounds of nature and sounds of nature without LFV) were realised involving 24 participants. It was found there was an effect on HRV, stress perception and mood after the interventions. However, there were only seldomly experienced, and mostly nonsignificant, di...
2019 •
The research objective of the author is to find out what the values contained in the Reog Ponorogo ritual process are as well as to find out the reason why the ritual ceremonies are still performed today. The theory used in this study is about values and rituals. Value is an order that is used as a guide by individuals to weigh and choose alternative decisions in certain social situations. While the Ritual is a series of words, acts of religion followers or rituals with certain objects, equipment and equipment, in certain places and wearing certain clothes. The research method used is a qualitative research method that can be interpreted as a type of research which is referred to as a new method because of its recent popularity. Also called postpositivisic methods because they are based on the philosophy of postpositivism. This method is also called an artistic method, because the research process is more artistic (less patterned) and is called an interpretive method because the res...
European Journal of Organic Chemistry
Copper- and Cobalt-Catalyzed Syntheses of Thiophene-Based Tertiary Amines2019 •
Physical review letters
Engineered Unique Elastic Modes at a BaTiO_{3}/(2×1)-Ge(001) Interface2016 •
The strong interaction at an interface between a substrate and thin film leads to epitaxy and provides a means of inducing structural changes in the epitaxial film. These induced material phases often exhibit technologically relevant electronic, magnetic, and functional properties. The 2×1 surface of a Ge(001) substrate applies a unique type of epitaxial constraint on thin films of the perovskite oxide BaTiO_{3} where a change in bonding and symmetry at the interface leads to a non-bulk-like crystal structure of the BaTiO_{3}. While the complex crystal structure is predicted using first-principles theory, it is further shown that the details of the structure are a consequence of hidden phases found in the bulk elastic response of the BaTiO_{3} induced by the symmetry of forces exerted by the germanium substrate.
Revista De Economia Institucional
Rationality and Cooperation Between Firms. Testing Habitual Behavior in Greek Industries2005 •
Asian Review of Social Sciences
Triple Marginalization and Struggle for Autonomy: A Study on Dalit Women in BangladeshDalit people have been marginalized in different spheres of life since the dawn of modern civilization. The situation of Dalit women is even more complex. This paper aims at understanding the marginalization of Dalit women at a local context in Bangladesh based on empirical evidences. Data for the study were collected using mixed-method approach. The findings of the study reveal that Dalit women have to confront different forms of discrimination both in their own community as well as wider society. They face various types of patriarchal customs, such as dowry, domestic violence, dehumanization, and child marriage within their society. In addition, they frequently face inequalities in job and not treated with dignity in the wider society. The findings of the study reveal that these realities are constantly changing and Dalit women are continuously working for the betterment of their community as the soulful agents.
Sedimentary Geology
A model of early calcite cementation in alluvial fans: Evidence from the Burdigalian sandstones and limestones of the Vallès-Penedès half-graben (NE Spain)2005 •
Frontiers in Communication
Corrigendum: Moving Toward Inclusion: Participant Responses to the Inclusive SciComm Symposium2020 •
2019 •
Applied Mathematics and Computation
Free vibration analysis of functionally graded size-dependent nanobeams2012 •
The American Journal of Surgery
Modifications in the production of cytokines and growth factors in drainage fluids following mesh implantation after incisional hernia repair2006 •
1961 •
European History Quarterly, 53
Resisting Models, Building Bridges: The Present and Future of Gender History in Spain2023 •
Toàn Huỳnh