Chapter 2 The Microsporangium and the Pollen Grain
... 2.4.4 Synthesis of Sporopollenin: Deposition Sporopollenin is a highly resistant chemical substance(s) in the pollen exine and exosporium of a large number of spore walls. The synthesis of sporopollenin occurs both in the tapetum and in the cytoplasm of young spores. In the microspores it is deposit ...
... 2.4.4 Synthesis of Sporopollenin: Deposition Sporopollenin is a highly resistant chemical substance(s) in the pollen exine and exosporium of a large number of spore walls. The synthesis of sporopollenin occurs both in the tapetum and in the cytoplasm of young spores. In the microspores it is deposit ...
Untitled - University of Guelph
... Although the final shapes of these model cells differ greatly, they do share a common growth mechanism [7]. Based on the area over which growth is spread during the development of a cell, the different cell types can be placed into two broad categories. Root hairs and pollen tubes are recognized as ...
... Although the final shapes of these model cells differ greatly, they do share a common growth mechanism [7]. Based on the area over which growth is spread during the development of a cell, the different cell types can be placed into two broad categories. Root hairs and pollen tubes are recognized as ...
7-2 Eukaryotic Cell Structure
... Vacuoles Some cells contain saclike structures called vacuoles that store materials such as water, salts, proteins, and carbohydrates. ...
... Vacuoles Some cells contain saclike structures called vacuoles that store materials such as water, salts, proteins, and carbohydrates. ...
7-2 Eukaryotic Cell Structure
... Vacuoles Some cells contain saclike structures called vacuoles that store materials such as water, salts, proteins, and carbohydrates. ...
... Vacuoles Some cells contain saclike structures called vacuoles that store materials such as water, salts, proteins, and carbohydrates. ...
7-2 Eukaryotic Cell Structure
... Vacuoles Some cells contain saclike structures called vacuoles that store materials such as water, salts, proteins, and carbohydrates. ...
... Vacuoles Some cells contain saclike structures called vacuoles that store materials such as water, salts, proteins, and carbohydrates. ...
Actions of plant hormones on shoot systems (stems and
... Increases size of seedless grapes; delays senescence in citrus fruits; stimulates bolting & flowering in long ...
... Increases size of seedless grapes; delays senescence in citrus fruits; stimulates bolting & flowering in long ...
Text - Enlighten: Publications
... composition and architecture, and its role in polar expansion of root hairs than for other polar expanding plant cells. This is due to the exceptionally fragile nature of the hairs, especially when handling during experimental manipulation, and the difficulty in obtaining sufficient amounts of root ...
... composition and architecture, and its role in polar expansion of root hairs than for other polar expanding plant cells. This is due to the exceptionally fragile nature of the hairs, especially when handling during experimental manipulation, and the difficulty in obtaining sufficient amounts of root ...
AGL80 Is Required for Central Cell and Endosperm Development in
... not significantly different from that of the wild-type allele (P > 0.5), indicating that the male gametophyte is not affected. As shown in Table 1, the penetrance of the fem111 mutation is 100% in the female gametophyte. As a consequence, we were not able to isolate homozygous mutants and, thus, wer ...
... not significantly different from that of the wild-type allele (P > 0.5), indicating that the male gametophyte is not affected. As shown in Table 1, the penetrance of the fem111 mutation is 100% in the female gametophyte. As a consequence, we were not able to isolate homozygous mutants and, thus, wer ...
A Simple 1-D Physical Model for the Crawling Nematode Sperm Cell
... Biochemical Regulation. The precise role played by pH in MSP turnover, bundling and adhesion is yet to be established. In the model, we use pH distribution as a marker for these processes. We assume that protons constantly appear at the cell body, and that protons leak out from the lamellipod, maint ...
... Biochemical Regulation. The precise role played by pH in MSP turnover, bundling and adhesion is yet to be established. In the model, we use pH distribution as a marker for these processes. We assume that protons constantly appear at the cell body, and that protons leak out from the lamellipod, maint ...
pdf: Xu et al. 2008
... (A) Structures of the predicted FEI and ERECTA proteins. The percentage identities between the kinase or LRR N-terminal domains of FEI1 and FEI2 or FEI2 and ERECTA are indicated. aa, amino acids. (B) Cartoon of fei1, fei2-1, and fei2-2 alleles. Boxes represent exons (blue area represents the kinase ...
... (A) Structures of the predicted FEI and ERECTA proteins. The percentage identities between the kinase or LRR N-terminal domains of FEI1 and FEI2 or FEI2 and ERECTA are indicated. aa, amino acids. (B) Cartoon of fei1, fei2-1, and fei2-2 alleles. Boxes represent exons (blue area represents the kinase ...
Using monoclonal antibodies to label living root hairs: a novel tool
... composition and architecture, and its role in polar expansion of root hairs than for other polar expanding plant cells. This is due to the exceptionally fragile nature of the hairs, especially when handling during experimental manipulation, and the difficulty in obtaining sufficient amounts of root ...
... composition and architecture, and its role in polar expansion of root hairs than for other polar expanding plant cells. This is due to the exceptionally fragile nature of the hairs, especially when handling during experimental manipulation, and the difficulty in obtaining sufficient amounts of root ...
Plant architecture
... after they have ceased to divide. The fact that cell size is usually quite uniform over the area of a leaf suggests that cell number, rather than cell size, determines the dimensions of an organ. Does this mean that the number and direction of cell divisions define organ shape and size, whereas expa ...
... after they have ceased to divide. The fact that cell size is usually quite uniform over the area of a leaf suggests that cell number, rather than cell size, determines the dimensions of an organ. Does this mean that the number and direction of cell divisions define organ shape and size, whereas expa ...
... biomass (dry weight), limiting substrate and the production of secondary metabolite (anthocyanin); but its main limitation is to assume that the degradation of anthocyanins is an independent cell growth process. Zhang et al. [3] propose a structured model for strawberry cell cultures (Fragaria anana ...
Tissues Response to Injury
... refers to ‘Structural Abnormalities’ of which there are 10 groups including Inflammation, Thrombosis and Neoplasia. • ‘Tissue Response to Injury’ Concept include the concept of Degeneration and Necrosis for Reversible and Irreversible Injury respectively! • You as students of Pathology should apprec ...
... refers to ‘Structural Abnormalities’ of which there are 10 groups including Inflammation, Thrombosis and Neoplasia. • ‘Tissue Response to Injury’ Concept include the concept of Degeneration and Necrosis for Reversible and Irreversible Injury respectively! • You as students of Pathology should apprec ...
The Gram
... between two distantly related groups of bacteria - those that retained the stain (Gram-positive) and those that did not (Gram-negative) b. The Gram-stain is one of the first steps in identifying an unknown bacterial culture c. Gram reaction is important in medicine because some antibiotics are effec ...
... between two distantly related groups of bacteria - those that retained the stain (Gram-positive) and those that did not (Gram-negative) b. The Gram-stain is one of the first steps in identifying an unknown bacterial culture c. Gram reaction is important in medicine because some antibiotics are effec ...
Staining Bacteria
... method to stain bacteria so they can be visible in specimen samples. • Differentiate bacteria into two large groups (the Gram Positive and the Gram negative) • Gram status is important in medicine; the presence or absence of a cell wall will change the bacterium's susceptibility to some antibiotics ...
... method to stain bacteria so they can be visible in specimen samples. • Differentiate bacteria into two large groups (the Gram Positive and the Gram negative) • Gram status is important in medicine; the presence or absence of a cell wall will change the bacterium's susceptibility to some antibiotics ...
Matching Terms Test
... pocket folds for large molecules to enter the cell basic substance for life produces, stores & packages secretion for discharge from the cell cell structures that help with function creates even cell division allows for transport of materials forms chromosomes contain digestive enzymes that destroy ...
... pocket folds for large molecules to enter the cell basic substance for life produces, stores & packages secretion for discharge from the cell cell structures that help with function creates even cell division allows for transport of materials forms chromosomes contain digestive enzymes that destroy ...
to the complete text
... show that a ‘microtip’ can form at the apex of Aspergillus niger hyphae under conditions of nutrient stress, so that the cell resembles the shape of a dolphin’s head (Fig 3). The function of this morphology is not known, though Bowen et al. (2007) speculate that it may play some role in sensing the ...
... show that a ‘microtip’ can form at the apex of Aspergillus niger hyphae under conditions of nutrient stress, so that the cell resembles the shape of a dolphin’s head (Fig 3). The function of this morphology is not known, though Bowen et al. (2007) speculate that it may play some role in sensing the ...
PDF Full-text
... The application of reverse genetics to the protoplast-based cell wall regeneration system also provides an attractive approach for characterizing cell wall proteins. It is not easy, however, to establish a suspension culture cell line with specific genes knocked out. We therefore recently developed ...
... The application of reverse genetics to the protoplast-based cell wall regeneration system also provides an attractive approach for characterizing cell wall proteins. It is not easy, however, to establish a suspension culture cell line with specific genes knocked out. We therefore recently developed ...
Section 2
... Cell biologists divide the eukaryotic cell into two major parts: the nucleus and the cytoplasm. The cytoplasm is the portion of the cell outside the nucleus. Slide 3 of 49 Copyright Pearson Prentice Hall ...
... Cell biologists divide the eukaryotic cell into two major parts: the nucleus and the cytoplasm. The cytoplasm is the portion of the cell outside the nucleus. Slide 3 of 49 Copyright Pearson Prentice Hall ...
7-2 Eukaryotic Cell Structure
... Cell biologists divide the eukaryotic cell into two major parts: the nucleus and the cytoplasm. The cytoplasm is the portion of the cell outside the nucleus. Slide 3 of 49 Copyright Pearson Prentice Hall ...
... Cell biologists divide the eukaryotic cell into two major parts: the nucleus and the cytoplasm. The cytoplasm is the portion of the cell outside the nucleus. Slide 3 of 49 Copyright Pearson Prentice Hall ...
Cell wall
The cell wall is a tough, flexible and sometimes rigid layer that surrounds some types of cells. It surrounds the cell membrane and provides these cells with structural support and protection. In addition, the cell wall acts as a filtering mechanism. A major function of the cell wall is to act as a pressure vessel, preventing over-expansion when water enters the cell. Cell walls are found in plants, fungi and prokaryotic cells but not in mycoplasmas.The composition of the cell wall varies between species and may depend on cell type and developmental stage. The primary cell wall of land plants is composed of the polysaccharides cellulose, hemicellulose and pectin. In bacteria, peptidoglycan forms the cell wall. Archaean cell walls have various compositions, and may be formed of glycoprotein S-layers, pseudopeptidoglycan, or polysaccharides. Fungi possess cell walls made of the glucosamine polymer chitin, and algae typically possess walls made of glycoproteins and polysaccharides. Unusually, diatoms have a cell wall composed of biogenic silica. Often, other accessory molecules are found anchored to the cell wall.