Research Output 1977 2018

  • 67 Article
  • 1 Chapter
  • 1 Conference contribution
  • 1 Comment/debate
2018
1 Citation (Scopus)

A Markedly Improved Synthetic Approach for the Preparation of Multifunctional Au-DNA Nanoparticle Conjugates Modified with Optical and MR Imaging Probes

Rotz, M. W., Holbrook, R. J., Macrenaris, K. W. & Meade, T. J., Nov 21 2018, In : Bioconjugate Chemistry. 29, 11, p. 3544-3549 6 p.

Research output: Contribution to journalArticle

Optical Imaging
Nanoparticles
DNA
Imaging techniques
Nucleic acids
2017
4 Citations (Scopus)

Catalytically Active Silicon Oxide Nanoclusters Stabilized in a Metal–Organic Framework

Rimoldi, M., Gallington, L. C., Chapman, K. W., Macrenaris, K. W., Hupp, J. T. & Farha, O. K., Jun 22 2017, In : Chemistry - A European Journal. 23, 35, p. 8532-8536 5 p.

Research output: Contribution to journalArticle

Aluminum Oxide
Nanoclusters
Silicon oxides
Aluminum
Oxides
11 Citations (Scopus)

Exploring the Association between Demographics, SLC30A8 Genotype, and Human Islet Content of Zinc, Cadmium, Copper, Iron, Manganese and Nickel

Wong, W. P., Allen, N. B., Meyers, M. S., Link, E. O., Zhang, X., Macrenaris, K. W. & El Muayed, M., Dec 1 2017, In : Scientific Reports. 7, 1, 473.

Research output: Contribution to journalArticle

Manganese
Nickel
Cadmium
Zinc
Copper
11 Citations (Scopus)

Gd(III)-gold nanoconjugates provide remarkable cell labeling for high field magnetic resonance imaging

Rammohan, N., Holbrook, R. J., Rotz, M. W., Macrenaris, K. W., Preslar, A. T., Carney, C. E., Reichova, V. & Meade, T. J., Jan 1 2017, In : Bioconjugate Chemistry. 28, 1, p. 153-160 8 p.

Research output: Contribution to journalArticle

Nanoconjugates
Magnetic resonance
Gold
Labeling
Magnetic Resonance Imaging
6 Citations (Scopus)

Synthesis and evaluation of MR probes for targeted-reporter imaging

Verma, K. D., Massing, J. O., Kamper, S. G., Carney, C. E., Macrenaris, K. W., Basilion, J. P. & Meade, T. J., Jan 1 2017, In : Chemical Science. 8, 8, p. 5764-5768 5 p.

Research output: Contribution to journalArticle

Imaging techniques
Chemical activation
Enzymes
2016
20 Citations (Scopus)

Cell-Permeable Esterase-Activated Ca(II)-Sensitive MRI Contrast Agent

Macrenaris, K. W., Ma, Z., Krueger, R. L., Carney, C. E. & Meade, T. J., Feb 17 2016, In : Bioconjugate Chemistry. 27, 2, p. 465-473 9 p.

Research output: Contribution to journalArticle

Esterases
Magnetic resonance imaging
Contrast Media
Esters
Central Nervous System
42 Citations (Scopus)

DNA-gadolinium-gold nanoparticles for in vivo T1 MR imaging of transplanted human neural stem cells

Nicholls, F. J., Rotz, M. W., Ghuman, H., Macrenaris, K. W., Meade, T. J. & Modo, M., Jan 1 2016, In : Biomaterials. 77, p. 291-306 16 p.

Research output: Contribution to journalArticle

Neural Stem Cells
Gadolinium
Stem cells
Gold
Nanoparticles
34 Citations (Scopus)

Gd(III)-Dithiolane Gold Nanoparticles for T1-Weighted Magnetic Resonance Imaging of the Pancreas

Holbrook, R. J., Rammohan, N., Rotz, M. W., Macrenaris, K. W., Preslar, A. T. & Meade, T. J., May 11 2016, In : Nano letters. 16, 5, p. 3202-3209 8 p.

Research output: Contribution to journalArticle

pancreas
Gold
magnetic resonance
Tissue
gold
9 Citations (Scopus)

In situ biomineralization and particle deposition distinctively mediate biofilm susceptibility to chlorine

Li, X., Chopp, D. L., Russin, W. A., Brannon, P. T., Parsek, M. R. & Packman, A. I., May 1 2016, In : Applied and Environmental Microbiology. 82, 10, p. 2886-2892 7 p.

Research output: Contribution to journalArticle

biomineralization
Chlorine
Biofilms
chlorine
biofilm
25 Citations (Scopus)

Nanodiamond-Gadolinium(III) Aggregates for Tracking Cancer Growth in Vivo at High Field

Rammohan, N., Macrenaris, K. W., Moore, L. K., Parigi, G., Mastarone, D. J., Manus, L. M., Lilley, L. M., Preslar, A. T., Waters, E. A., Filicko, A., Luchinat, C., Ho, D. & Meade, T. J., Dec 14 2016, In : Nano letters. 16, 12, p. 7551-7564 14 p.

Research output: Contribution to journalArticle

Nanodiamonds
Gadolinium
gadolinium
magnetic resonance
cancer
2015
64 Citations (Scopus)

Amorphous intergranular phases control the properties of rodent tooth enamel

Gordon, L. M., Cohen, M. J., Macrenaris, K. W., Pasteris, J. D., Seda, T. & Joester, D., Feb 13 2015, In : Science. 347, 6223, p. 746-750 5 p.

Research output: Contribution to journalArticle

Rodent Control
Dental Enamel
Tooth
Nanowires
Acids

Erratum: To Gd(III)-Labeled Peptide Nanofibers for Reporting on Biomaterial Localization in Vivo(ACS Nano (2014) 8 (7325-7332) DOI: 10.1021/nn502393u)

Preslar, A. T., Parigi, G., McClendon, M. T., Sefick, S. S., Moyer, T. J., Haney, C. R., Waters, E. A., MacRenaris, K. W., Luchinat, C., Stupp, S. I. & Meade, T. J., Nov 24 2015, In : ACS Nano. 9, 11, 1 p.

Research output: Contribution to journalComment/debate

Biocompatible Materials
Nanofibers
Peptides
49 Citations (Scopus)

High relaxivity Gd(III)-DNA gold nanostars: Investigation of shape effects on proton relaxation

Rotz, M. W., Culver, K. S. B., Parigi, G., Macrenaris, K. W., Luchinat, C., Odom, T. W. & Meade, T. J., Mar 24 2015, In : ACS nano. 9, 3, p. 3385-3396 12 p.

Research output: Contribution to journalArticle

Gold
Protons
DNA
deoxyribonucleic acid
Nanoconjugates
2 Citations (Scopus)

Investigation of the optical response of photonic crystal nanocavities in ferroelectric oxide thin film

Lin, P. T., Russin, W. A., Joshi-Imre, A., Ocola, L. E. & Wessels, B. W., Sep 4 2015, In : Journal of Optics (United Kingdom). 17, 10, 105402.

Research output: Contribution to journalArticle

Photonic crystals
Oxide films
Ferroelectric materials
photonics
Thin films
37 Citations (Scopus)

Multimeric Near IR-MR Contrast Agent for Multimodal in Vivo Imaging

Harrison, V. S. R., Carney, C. E., Macrenaris, K. W., Waters, E. A. & Meade, T. J., Jul 22 2015, In : Journal of the American Chemical Society. 137, 28, p. 9108-9116 9 p.

Research output: Contribution to journalArticle

Optical Imaging
Heterografts
Contrast Media
Coloring Agents
Fluorescence
13 Citations (Scopus)

Nanodiscs as a modular platform for multimodal MR-optical imaging

Carney, C. E., Lenov, I. L., Baker, C. J., Macrenaris, K. W., Eckermann, A. L., Sligar, S. G. & Meade, T. J., May 20 2015, In : Bioconjugate Chemistry. 26, 5, p. 899-905 7 p.

Research output: Contribution to journalArticle

Optical Imaging
Contrast Media
Imaging techniques
Membrane Proteins
Lipid bilayers
24 Citations (Scopus)

Spatial patterns of carbonate biomineralization in biofilms

Li, X., Chopp, D. L., Russin, W. A., Brannon, P. T., Parsek, M. R. & Packman, A. I., Jan 1 2015, In : Applied and Environmental Microbiology. 81, 21, p. 7403-7410 8 p.

Research output: Contribution to journalArticle

biomineralization
Carbonates
Biofilms
biofilm
carbonates
81 Citations (Scopus)

Towards non-invasive diagnostic imaging of early-stage Alzheimer's disease

Viola, K. L., Sbarboro, J., Sureka, R., De, M., Bicca, M. A., Wang, J., Vasavada, S., Satpathy, S., Wu, S., Joshi, H., Velasco, P. T., Macrenaris, K. W., Waters, E. A., Lu, C., Phan, J., Lacor, P., Prasad, P., Dravid, V. P. & Klein, W. L., Jan 1 2015, In : Nature nanotechnology. 10, 1, p. 91-98 8 p.

Research output: Contribution to journalArticle

oligomers
Oligomers
Imaging techniques
Magnetic resonance
magnetic resonance
1 Citation (Scopus)

Water-soluble lipophilic MR contrast agents for cell membrane labeling

Carney, C. E., Macrenaris, K. W. & Meade, T. J., Sep 24 2015, In : Journal of Biological Inorganic Chemistry. 20, 6, p. 971-977 7 p.

Research output: Contribution to journalArticle

Cell membranes
Labeling
Contrast Media
Cell Membrane
Water
2014
17 Citations (Scopus)

A multimeric MR-optical contrast agent for multimodal imaging

Harrison, V. S. R., Carney, C. E., Macrenaris, K. W. & Meade, T. J., Oct 9 2014, In : Chemical Communications. 50, 78, p. 11469-11471 3 p.

Research output: Contribution to journalArticle

Fluorophores
Contrast Media
Imaging techniques
Solubility
Water
14 Citations (Scopus)

Cell labeling via membrane-anchored lipophilic MR contrast agents

Carney, C. E., Macrenaris, K. W., Mastarone, D. J., Kasjanski, D. R., Hung, A. H. & Meade, T. J., May 21 2014, In : Bioconjugate Chemistry. 25, 5, p. 945-954 10 p.

Research output: Contribution to journalArticle

Labeling
Contrast Media
Membranes
Labels
Cell Tracking
32 Citations (Scopus)

Gd(III)-labeled peptide nanofibers for reporting on biomaterial localization in vivo

Preslar, A. T., Parigi, G., McClendon, M. T., Sefick, S. S., Moyer, T. J., Haney, C. R., Waters, E. A., Macrenaris, K. W., Luchinat, C., Stupp, S. & Meade, T. J., Jul 22 2014, In : ACS nano. 8, 7, p. 7325-7332 8 p.

Research output: Contribution to journalArticle

Amphiphiles
Biocompatible Materials
Nanofibers
Biomaterials
Peptides
41 Citations (Scopus)

Graphene oxide enhances cellular delivery of hydrophilic small molecules by co-incubation

Hung, A. H., Holbrook, R. J., Rotz, M. W., Glasscock, C. J., Mansukhani, N. D., Macrenaris, K. W., Manus, L. M., Duch, M. C., Dam, K. T., Hersam, M. & Meade, T. J., Jan 1 2014, In : ACS Nano. 8, 10, p. 10168-10177 10 p.

Research output: Contribution to journalArticle

Graphite
Oxides
Graphene
delivery
graphene
4 Citations (Scopus)

Progesterone-targeted magnetic resonance imaging probes

Townsend, T. R., Moyle-Heyrman, G., Sukerkar, P. A., Macrenaris, K. W., Burdette, J. E. & Meade, T. J., Aug 20 2014, In : Bioconjugate Chemistry. 25, 8, p. 1428-1437 10 p.

Research output: Contribution to journalArticle

Progesterone Receptors
Magnetic resonance
Progesterone
Gadolinium
Magnetic Resonance Imaging
14 Citations (Scopus)

Synthesis and characterization of a porphyrazine-Gd(III) MRI contrast agent and in vivo imaging of a breast cancer xenograft model

Trivedi, E. R., Ma, Z., Waters, E. A., Macrenaris, K. W., Subramanian, R., Barrett, A. G. M., Meade, T. J. & Hoffman, B. M., Jan 1 2014, In : Contrast Media and Molecular Imaging. 9, 4, p. 313-322 10 p.

Research output: Contribution to journalArticle

Heterografts
Contrast Media
Breast Neoplasms
Alkynes
Azides
2013
20 Citations (Scopus)

Mechanisms of gadographene-mediated proton spin relaxation

Hung, A. H., Duch, M. C., Parigi, G., Rotz, M. W., Manus, L. M., Mastarone, D. J., Dam, K. T., Gits, C. C., Macrenaris, K. W., Luchinat, C., Hersam, M. & Meade, T. J., Aug 8 2013, In : Journal of Physical Chemistry C. 117, 31, p. 16263-16273 11 p.

Research output: Contribution to journalArticle

Graphite
Graphene
Protons
graphene
Carbon
9 Citations (Scopus)

PH-responsive theranostic polymer-caged nanobins: Enhanced cytotoxicity and T1 MRI contrast by Her2 targeting

Hong, B. J., Swindell, E. P., Macrenaris, K. W., Hankins, P. L., Chipre, A. J., Mastarone, D. J., Ahn, R. W., Meade, T. J., O'Halloran, T. V. & Nguyen, S., Sep 1 2013, In : Particle and Particle Systems Characterization. 30, 9, p. 770-774 5 p.

Research output: Contribution to journalArticle

Magnetic resonance
Cytotoxicity
magnetic resonance
Polymers
Imaging techniques
22 Citations (Scopus)

Structural optimization of Zn(II)-activated magnetic resonance imaging probes

Matosziuk, L. M., Leibowitz, J. H., Heffern, M. C., Macrenaris, K. W., Ratner, M. A. & Meade, T. J., Nov 4 2013, In : Inorganic Chemistry. 52, 21, p. 12250-12261 12 p.

Research output: Contribution to journalArticle

Structural optimization
Magnetic resonance
magnetic resonance
Imaging techniques
optimization
2012
38 Citations (Scopus)

Accumulation of cadmium in insulin-producing β cells

El Muayed, M., Raja, M. R., Zhang, X., Macrenaris, K. W., Bhatt, S., Chen, X., Urbanek, M., O'Halloran, T. V. & Lowe Jr, W. L., Nov 1 2012, In : Islets. 4, 6, p. 405-416 12 p.

Research output: Contribution to journalArticle

Cadmium
Insulin
Oxidative Stress
Cadmium Chloride
Type 2 Diabetes Mellitus
10 Citations (Scopus)

Synthesis, characterization, and in vitro testing of a bacteria-targeted MR contrast agent

Matosziuk, L. M., Harney, A. S., Macrenaris, K. W. & Meade, T. J., Apr 1 2012, In : European Journal of Inorganic Chemistry. 12, p. 2099-2107 9 p.

Research output: Contribution to journalArticle

Contrast Media
Bacteria
Testing
Labeling
Escherichia coli
2011
23 Citations (Scopus)

A steroid-conjugated magnetic resonance probe enhances contrast in progesterone receptor expressing organs and tumors in vivo

Sukerkar, P. A., Macrenaris, K. W., Meade, T. J. & Burdette, J. E., Aug 1 2011, In : Molecular Pharmaceutics. 8, 4, p. 1390-1400 11 p.

Research output: Contribution to journalArticle

Progesterone Receptors
Magnetic Resonance Spectroscopy
Steroids
Neoplasms
Magnetic Resonance Imaging
5 Citations (Scopus)

Polystyrene microsphere-ferritin conjugates: A robust phantom for correlation of relaxivity and size distribution

Sukerkar, P. A., Rezvi, U. G., Macrenaris, K. W., Patel, P. C., Wood, J. C. & Meade, T. J., Feb 1 2011, In : Magnetic Resonance in Medicine. 65, 2, p. 522-530 9 p.

Research output: Contribution to journalArticle

Polystyrenes
Ferritins
Microspheres
Iron
Hemosiderin
48 Citations (Scopus)

Probing the chemical stability of mixed ferrites: Implications for magnetic resonance contrast agent design

Schultz-Sikma, E. A., Joshi, H. M., Ma, Q., Macrenaris, K. W., Eckermann, A. L., Dravid, V. P. & Meade, T. J., May 24 2011, In : Chemistry of Materials. 23, 10, p. 2657-2664 8 p.

Research output: Contribution to journalArticle

Ferrites
Chemical stability
Magnetic resonance
Contrast Media
Nanoparticles
31 Citations (Scopus)

Synthesis and biological evaluation of water-soluble progesterone- conjugated probes for magnetic resonance imaging of hormone related cancers

Sukerkar, P. A., Macrenaris, K. W., Townsend, T. R., Ahmed, R. A., Burdette, J. E. & Meade, T. J., Nov 16 2011, In : Bioconjugate Chemistry. 22, 11, p. 2304-2316 13 p.

Research output: Contribution to journalArticle

Hormones
Progesterone Receptors
Magnetic resonance
Progesterone
Magnetic Resonance Imaging
2010
224 Citations (Scopus)

Gd(III)-nanodiamond conjugates for MRI contrast enhancement

Manus, L. M., Mastarone, D. J., Waters, E. A., Zhang, X. Q., Schultz-Sikma, E. A., Macrenaris, K. W., Ho, D. & Meade, T. J., Feb 10 2010, In : Nano Letters. 10, 2, p. 484-489 6 p.

Research output: Contribution to journalArticle

Nanodiamonds
Magnetic resonance imaging
augmentation
monomers
protons
91 Citations (Scopus)

Highly dispersible, superparamagnetic magnetite nanoflowers for magnetic resonance imaging

Hu, F., Macrenaris, K. W., A. Waters, E., Schultz-Sikma, E. A., Eckermann, A. L. & Meade, T. J., Jan 1 2010, In : Chemical Communications. 46, 1, p. 73-75 3 p.

Research output: Contribution to journalArticle

Nanoflowers
Ferrosoferric Oxide
Magnetite
Magnetic resonance
Imaging techniques
43 Citations (Scopus)

Modular polymer-caged nanobins as a theranostic platform with enhanced magnetic resonance relaxivity and pH-responsive drug release

Lee, S. M., Song, Y., Hong, B. J., Macrenaris, K. W., Mastarone, D. J., O'Halloran, T. V., Meade, T. J. & Nguyen, S., Dec 17 2010, In : Angewandte Chemie - International Edition. 49, 51, p. 9960-9964 5 p.

Research output: Contribution to journalArticle

gemcitabine
Magnetic resonance
Polymers
Gadolinium
Pharmaceutical Preparations
2009
5 Citations (Scopus)

Ferroelectric thin film microcavities and their optical resonant properties

Lin, P. T., Russin, W. A., Imre, A., Ocola, L. E. & Wessels, B. W., Dec 1 2009, Materials for Nanophotonics - Plasmonics, Metamaterials and Light Localization. Vol. 1182. p. 21-26 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ferroelectric thin films
Microcavities
Photonic crystals
photonics
Fluorescence
132 Citations (Scopus)

Multimodal gadolinium-enriched DNA-gold nanoparticle conjugates for cellular imaging

Song, Y., Xu, X., Macrenaris, K. W., Zhang, X. Q., Mirkin, C. A. & Meade, T. J., Nov 16 2009, In : Angewandte Chemie - International Edition. 48, 48, p. 9143-9147 5 p.

Research output: Contribution to journalArticle

Gadolinium
Gold
DNA
Nanoparticles
Imaging techniques
102 Citations (Scopus)

Ultrasmall, water-soluble magnetite nanoparticles with high relaxivity for magnetic resonance imaging

Hu, F., Macrenaris, K. W., Waters, E. A., Liang, T., Schultz-Sikma, E. A., Eckermann, A. L. & Meade, T. J., Dec 1 2009, In : Journal of Physical Chemistry C. 113, 49, p. 20855-20860 6 p.

Research output: Contribution to journalArticle

Magnetite Nanoparticles
Magnetite nanoparticles
Magnetic resonance
magnetite
magnetic resonance
2008
16 Citations (Scopus)

A novel cholic acid-based contrast enhancement agent for targeted MRI

Chong, H. S., Song, H. A., Lim, S., Macrenaris, K. W., Ma, X., Lee, H., Bui, P. & Meade, T. J., Apr 1 2008, In : Bioorganic and Medicinal Chemistry Letters. 18, 7, p. 2505-2508 4 p.

Research output: Contribution to journalArticle

Cholic Acid
Magnetic resonance imaging
Contrast Media
Micelles
Nanoparticles
46 Citations (Scopus)

Cell-permeable MR contrast agents with increased intracellular retention

Endres, P. J., Macrenaris, K. W., Vogt, S. & Meade, T. J., Oct 1 2008, In : Bioconjugate Chemistry. 19, 10, p. 2049-2059 11 p.

Research output: Contribution to journalArticle

Contrast Media
Arginine
Cell-Penetrating Peptides
Pentetic Acid
Polypeptides
2007
33 Citations (Scopus)

Rational Design, Synthesis, and Biological Evaluation of Progesterone-Modified MRI Contrast Agents

Lee, J., Burdette, J. E., Macrenaris, K. W., Mustafi, D., Woodruff, T. K. & Meade, T. J., Jul 30 2007, In : Chemistry and Biology. 14, 7, p. 824-834 11 p.

Research output: Contribution to journalArticle

Magnetic resonance
Contrast Media
Progesterone
Magnetic Resonance Imaging
Imaging techniques
2006
85 Citations (Scopus)

Multifunctional polymeric nanoparticles from diverse bioactive agents

Bertin, P. A., Gibbs, J. M., Shen, C. K. F., Thaxton, C. S., Russin, W. A., Mirkin, C. A. & Nguyen, S. T., Apr 5 2006, In : Journal of the American Chemical Society. 128, 13, p. 4168-4169 2 p.

Research output: Contribution to journalArticle

Antibodies
Nanoparticles
Cells
Breast Neoplasms
Neoplasm Antibodies
27 Citations (Scopus)

Quantitative imaging of cell-permeable magnetic resonance contrast agents using X-ray fluorescence

Endres, P. J., Macrenaris, K. W., Vogt, S., Allen, M. J. & Meade, T. J., Oct 1 2006, In : Molecular Imaging. 5, 4, p. 485-497 13 p.

Research output: Contribution to journalArticle

Magnetic resonance
Contrast Media
Magnetic Resonance Spectroscopy
Fluorescence
X-Rays
2005
45 Citations (Scopus)

A novel mechanism for protein delivery: Granzyme B undergoes electrostatic exchange from serglycin to target cells

Raja, S. M., Metkar, S. S., Höning, S., Wang, B., Russin, W. A., Pipalia, N. H., Menaa, C., Belting, M., Cao, X., Dressel, R. & Froelich, C. J., May 27 2005, In : Journal of Biological Chemistry. 280, 21, p. 20752-20761 10 p.

Research output: Contribution to journalArticle

Granzymes
Static Electricity
Electrostatics
A73025
Proteins
2004
68 Citations (Scopus)

Cellular delivery of MRI contrast agents

Allen, M. J., MacRenaris, K. W., Venkatasubramanian, P. N. & Meade, T. J., Mar 1 2004, In : Chemistry and Biology. 11, 3, p. 301-307 7 p.

Research output: Contribution to journalArticle

Magnetic resonance imaging
Contrast Media
Magnetic Resonance Imaging
Oligomers
Imaging Phantoms
2001
6 Citations (Scopus)

Carbonic anhydrase localization in charophycean green algae: Ecological and evolutionary significance

Arancibia-Avila, P., Coleman, J. R., Russin, W. A., Graham, J. M. & Graham, L. E., Jan 1 2001, In : International Journal of Plant Sciences. 162, 1, p. 127-135 9 p.

Research output: Contribution to journalArticle

Chara
Chlamydomonas
carbonate dehydratase
green alga
Mougeotia

Vacuum-Microwave Combination for Processing Plant Tissues for Electron Microscopy

Russin, W. A. & Trivett, C. L., 2001, Microwave Techniques and Protocols. Giberson, R. T. & Demaree, R. S. (eds.). Totowa, NJ: Humana Press Inc., p. 25-35

Research output: Chapter in Book/Report/Conference proceedingChapter

vacuoles
plant tissues
electron microscopy
plastids
solutes
2000
9 Citations (Scopus)

Effects of pH on cell morphology and carbonic anhydrase activity and localization in bloom-forming Mougeotia (Chlorophyta, Charophyceae)

Arancibia-Avila, P., Coleman, J. R., Russin, W. A., Wilcox, L. W., Graham, J. M. & Graham, L. E., Jan 1 2000, In : Canadian Journal of Botany. 78, 9, p. 1206-1214 9 p.

Research output: Contribution to journalArticle

Charophyceae
Mougeotia
carbonate dehydratase
chloroplast
Chlorophyta