Tài liệu miễn phí Sinh học
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Lecture Campbell biology: Concepts and connections (Seventh edition) - Chapter 2: The chemical basis of life. In this chapter we will discuss: Elements, atoms, and compounds; chemical bonds; water's life supporting properties.
3/18/2021 4:23:39 AM +00:00
Lecture Campbell biology: Concepts and connections (Seventh edition) - Chapter 1: Biology: Exploring life. In this chapter we will discuss: Themes in the study of biology, evolution: the core theme of biology, the process of science, biology and everyday life.
3/18/2021 4:23:32 AM +00:00
This chapter describe the contributions made by Garrod, Beadle, and Tatum to our understanding of the relationship between genes and enzymes; briefly explain how information flows from gene to protein; compare transcription and translation in bacteria and eukaryotes; explain what it means to say that the genetic code is redundant and unambiguous;...
3/18/2021 4:23:24 AM +00:00
The chapter describe the contributions of the following people: Griffith; Avery, McCary, and MacLeod; Hershey and Chase; Chargaff; Watson and Crick; Franklin; Meselson and Stahl; describe the structure of DNA; describe the process of DNA replication; include the following terms: antiparallel structure, DNA polymerase, leading strand, lagging strand, Okazaki fragments, DNA ligase, primer, primase, helicase, topoisomerase, single-strand binding proteins.
3/18/2021 4:23:14 AM +00:00
This chapter distinguish between the following terms: somatic cell and gamete, autosome and sex chromosomes, haploid and diploid; describe the events that characterize each phase of meiosis; describe three events that occur during meiosis I but not mitosis; name and explain the three events that contribute to genetic variation in sexually reproducing organisms.
3/18/2021 4:23:07 AM +00:00
This chapter presents the following content: Most cell division results in genetically identical daughter cells, the mitotic phase alternates with interphase in the cell cycle, the eukaryotic cell cycle is regulated by a molecular control system.
3/18/2021 4:22:59 AM +00:00
This chapter presents the following content: Photosynthesis converts light energy to the chemical energy of food, the light reactions converts solar energy to the chemical energy of ATP and NADPH, the Calvin cycle uses the chemical energy of ATP and NADPH to reduce CO2 to sugar, alternative mechanisms of carbon fixation have evolved in hot, arid climates.
3/18/2021 4:22:51 AM +00:00
This chapter presents the following content: Catabolic pathways yield energy by oxidizing organic fuels; glycolysis harvests chemical energy by oxidizing glucose by pyruvate; after pyruvate is oxidized, the citric acid cycle completes the energy-yielding oxidation of organic molecules;...
3/18/2021 4:22:44 AM +00:00
This chapter presents the following content: An organism's metabolism transform matter and energy, of thermodynamics, The free-energy change of a reaction tells us whether or not the reaction occurs spontaneously, ATP powers cellular work by coupling exergonic reactions to engergonic reactions, enzymes speed up metabolic reactions by lowering energy barriers, regulation of enzyme activity helps control metabolism.
3/18/2021 4:22:36 AM +00:00
This chapter presents the following content: Cellular membranes are fluid mosaics of lipids and proteins, membranes structure results in selective permeability, passive transport in diffusion of a substance across a membrane with no energy investment, active transport uses energy to move solutes against their gradients, bulk transport across the plasma membrane occurs by exocytosis and endocytosis.
3/18/2021 4:22:28 AM +00:00
This chapter presents the following content: Biologists use microscopes and the tools of biochemistry to study cells, eukaryotic cells have internal membranes that compartmentalize their functions, the eukaryotic cell's genetic instructions are housed in the nucleus and carried out by the ribosomes, the endomembrane system regulates protein traffic and performs metabolic functions in the cell,...
3/18/2021 4:22:20 AM +00:00
This chapter presents the following content: Macromolecules are polymers, built from monomers; Carbohydrates serve as fuel and building material; Lipids are a diverse group of hydrophobic molecules.
3/18/2021 4:22:11 AM +00:00
This chapter presents the following content: Organic chemistry in the study of carbon compounds, carbon atoms can form diverse molecules by bonding to four other atoms, a few chemical groups are key to the functioning of biological molecules.
3/18/2021 4:22:04 AM +00:00
This chapter presents the following content: Polar covalent bonds in water molecules result in hydrogen bonding, four emergent properties of water contribute to Earth's suitability for life, acidic and basic conditions affect living organisms.
3/18/2021 4:21:57 AM +00:00
Lecture Campbell biology (9th edition) - Chapter 2: The chemical context of life. This chapter presents the following content: Matter consists of chemical elements in pure form and in combination called compounds, an element's properties depends on the structure of its atoms, the formation and function of molecules depend on chemical bonding between atoms, chemical reaction make and break chemical bonds.
3/18/2021 4:21:50 AM +00:00
Chapter 3 - Water and the fitness of the environment. After reading this chapter and attending lecture, the student should be able to: Describe how water contributes to the fitness of the environment to support life; describe the structure and geometry of a water molecule, and explain what properties emerge as a result of this structure; explain the relationship between the polar nature of water and its ability to form hydrogen bonds;...
3/18/2021 4:00:23 AM +00:00
Chapter 2 - The chemical context of life. After reading this chapter and attending lecture, the student should be able to: Define element and compound, state four elements essential to life that make up 96% of living matter, describe the structure of an atom,...
3/18/2021 4:00:15 AM +00:00
Chapter 1 - Introduction: Ten themes in the study of life. After reading this chapter and attending lecture, the student should be able to: Briefly describe unifying themes that pervade the science of biology, diagram the hierarchy of structural levels in biology, explain how the properties of life emerge from complex organization,...
3/18/2021 4:00:08 AM +00:00
The aim of the present investigation was to evaluate synergistic potential of cinnamon essential oil. The synergistic potential was evaluated with some commercial antibiotics and some other essential oils against multidrug resistant microorganisms.
3/18/2021 1:05:48 AM +00:00
The purpose of this study was to increase bacteria amylase activity of Bacillus licheniformis strain SEM11 through optimization of bacteria amylase activity and production medium. Amylase which could be a potential in various industries because it has a high bacteria amylase activity.
3/18/2021 1:03:58 AM +00:00
Nghiên cứu này trình bày kết quả khảo sát điều kiện nuôi cấy tối ưu nhằm kích thích sự sinh trưởng và khả năng phân hủy thuốc trừ sâu chlorpyrifos của các dòng vi khuẩn hiếu khí bản địa tại Đà Lạt. Thí nghiệm khảo sát ảnh hưởng của nhiệt độ, pH, nồng độ thuốc trừ sâu chlorpyrifos lên khả năng sinh trưởng và tốc độ phân hủy chlorpyrifos của 3 chủng vi khuẩn B2 (Acinetobacter calcoaceticus), T1 (Bacillus megaterium) và W3 (Sphingomonas pseudosanguims) được tiến hành trong môi trường muối khoáng tối thiểu MSM (minimal salt medium) lỏng có bổ sung chlorpyrifos làm nguồn cacbon duy nhất.
3/18/2021 12:48:22 AM +00:00
Nghiên cứu này được tiến hành với mục đích thủy phân sụn khớp chân gà với xúc tác enzyme Protamex nhằm thu axit amin. Thành phần hóa học của sụn khớp chân gà được phân tích, kết quả phân tích cho thấy hai thành phần chính trong chất khô của sụn khớp chân gà là lipid (19,72 ± 0,05%) và protein (13,34 ± 0,08%).
3/17/2021 11:04:44 PM +00:00
Nghiên cứu nhằm xác định khả năng kháng khuẩn của 7 loại tinh dầu: tinh dầu tần ( Plectranthus amboinicus), quế ( Cinnamon zeylanicum), sả ( Cymbopogon citratus), hương nhu ( Ocimum gratiss ium), bạc hà ( Mentha arvensis), chúc ( Citrus hystrix) và rau om ( Limnophila aromatica) đối với 8 chủng vi khuẩn: Escherichia coli (ATCC 25922, E. coli 92E, E. coli 82E, E. coli 74E); S. typhimurium; P. aeruginosa; S. aureus và L. monocytogenes bằng phương pháp khuếch tán trên đĩa thạch.
3/17/2021 11:04:37 PM +00:00
This study was conducted at Sasaki Animal Hospital in Ho Chi Minh City to manage this disease by the synthetic mesh implant. A 10-year castrated male Pomeranian (5.2 kg) was referred to clinical examination because of a 4-month complaint of the return of a mass at the perineal area.
3/17/2021 11:03:23 PM +00:00
Nghiên cứu được thực hiện nhằm đánh giá hiệu quả ức chế hình thành tinh thể Calcium oxalate gây sỏi thận của cây dược liệu, hướng tới tạo ra nguồn nguyên liệu cho quá trình sản xuất các sản phẩm có dược tính phòng và điều trị bệnh.
3/17/2021 10:54:55 PM +00:00
The aim of this study was to identify and evaluate for antimicrobial activity and phytochemical properties of the extracts from some plants belonging to different species such as Piper betle L., Allium cepa L., Allium ascalonium L., Allium Sativum L., Curcuma longa L., Paederia tomentosa L., Wedelia chinensis M. and Chromolaena odorata L. These extracts have been prepared and the antimicrobial activities have been examined on some bacteria strains like Escherichia coli T1 , Bacillus cereus M1 , Salmonella sp. ST, Shigella sp. AT and one fungus strain Aspegillus flavus KN by agar disc diffusion method. Results showed that the extracts from total of eight plant species have been inhibited the growth of all over the microorganisms strains used in the test at a different ratio, but the ethanol extracts from Piper betle and Wedelia chinensis M. showed the highest effect.
3/17/2021 10:09:12 PM +00:00
The present study is carried out to evaluate non- systemic fungicides and systemic and some bio-control agents against the disease and the results are presented herein.
3/17/2021 9:18:51 PM +00:00
The aim of this research was focused on studying the stability of ethanol–biodiesel– diesel three-component systems at different temperatures along with some basic fuel properties such as density, viscosity, heat value, cetane number and flash point.
3/17/2021 9:15:08 PM +00:00
Root-knot nematode caused by Meloidogyne incognita is the major constraints in production of tomato and other solanaceous crops. Nematode diseases have been controlled more recently by means of certain beneficial bacteria that are indigenous to the rhizosphere of plants. Among the PGPR, Bacillus spp. is very important bio-agent that has several benefits compared to other rhizobacteria. Biological control is free from residual and adverse environmental effects.
3/17/2021 8:59:00 PM +00:00
Nghiên cứu được thực hiện với mục tiêu xác định tính đa dạng thành phần loài động vật nổi và sử dụng chúng làm sinh vật chỉ thị để đánh giá chất lượng nước ở kênh Bún Xáng của thành phố Cần Thơ. Nghiên cứu thực hiện gồm 3 điểm thu mẫu (Đầu kênh, giữa kênh và cuối kênh) từ tháng 9 đến tháng 10 năm 2018 với 3 đợt thu mẫu.
3/17/2021 8:37:01 PM +00:00