Nhờ lấy giúp bài báo khoa học

The Carotenoid Pigment Zeaxanthin—A Review

M.G. Sajilata 1 , R.S. Singhal 1 , and M.Y. Kamat 1 1 Authors are with Food Engineering and Technology Dept., Inst. of Chemical Technology, Univ. of Mumbai, Matunga, Mumbai-400 019, India. Direct inquiries to author Singhal (E-mail: rekha@udct.org).

Copyright 2008 Institute of Food Technologists

ABSTRACT


ABSTRACT: Scientific evidence linking several diseases with diet has brought to light the beneficial effects of a number of natural food ingredients. Zeaxanthin is one such natural pigment emphasized for its critical role in the prevention of age-related macular degeneration (AMD), the leading cause of blindness. The review highlights zeaxanthin as a carotenoid pigment with promising nutraceutical implications, and enumerates the important plant and microbial sources for its production, the absorptive pathway of zeaxanthin in human system, and methods to assess its bioavailability besides other relevant aspects.
 
[SIZE=+2]Engineered isoprenoid pathway enhances astaxanthin production in Escherichia coli[/SIZE]

Chia-Wei Wang, Min-Kyu Oh, James C. Liao[SIZE=-1] *[/SIZE]Department of Chemical Engineering, University of California, Los Angeles, California 90095-1592
email: James C. Liao (liaoj@ucla.edu)[SIZE=-1]*[/SIZE]Correspondence to James C. Liao, Department of Chemical Engineering, University of California, Los Angeles, California 90095-1592

Keywords
isoprenoids; astaxanthin; isopentenyl diphosphate isomerase; geranylgeranyl diphosphate; metabolic engineering

Abstract

The isoprenoid pathway is a versatile biosynthetic network leading to over 23,000 compounds. Similar to other biosynthetic pathways, the production of isoprenoids in microorganisms is controlled by the supply of precursors, among other factors. To engineer a host that has the capability to supply geranylgeranyl diphosphate (GGPP), a common precursor of isoprenoids, we cloned and overexpressed isopentenyl diphosphate (IPP) isomerase (encoded by idi) from Escherichia coli and GGPP synthase (encoded by gps) from the archaebacterium Archaeoglobus fulgidus. The latter was shown to be a multifunctional enzyme converting dimethylallyl diphosphate (DMAPP) to GGPP. These two genes and the gene cluster (crtBIYZW) of the marine bacterium Agrobacterium aurantiacum were introduced into E. coli to produce astaxanthin, an orange pigment and antioxidant. This metabolically engineered strain produces astaxanthin 50 times higher than values reported before. To determine the rate-controlling steps in GGPP production, the IDI-GPS pathway was compared with another construct containing idi, ispA (encoding farnesyl diphosphate (FPP) synthase in E. coli), and crtE (encoding GGPP synthase from Erwinia uredovora). Results show that the conversion from FPP to GGPP is the first bottleneck, followed sequentially by IPP isomerization and FPP synthesis. Removal of these bottlenecks results in an E. coli strain providing sufficient precursors for in vivo synthesis of isoprenoids. © 1999 John Wiley & Sons, Inc. Biotechnol Bioeng 62: 235-241, 1999.
 

Mấy bài interscience của đc Cường bị sao ấy nhỉ? click vào nó bảo không set được cookies. Cho title nhé.

Các bác dán link Wiley chỉ copy đến hết cái ..../abstract là được, bỏ hết mấy cái sau dấu ? đi :mrgreen: Ví dụ link của bác Cường: http://www3.interscience.wiley.com/journal/119423783/abstract

Nói đâu bỏ đấy, đợi các bác đọc xong rồi xóa cho khỏi lạc đề :cry:
 
Nhờ lấy hộ bài báo:
"Correlation between yield and osmotic adjustment of peas (Pisum sativum L.) under drought stress"
B. Rodríguez-Maribonaa, J. L. Tenorioa, J. R. Condeb and L. Ayerbea
a Dpto. de Producción y Tecnología de Alimentos, CIT, INIA, Apdo. 8111, 280280-, Madrid, Spain
b Dpto. de Fitotecnia, EUITA, Ciudad Universitaria, 28040-, Madrid, Spain


Accepted 21 January 1991. ;
Available online 7 July 2003.

http://www.sciencedirect.com/scienc...f6ad722f3d13c5659b7&ie=/sdarticle.pdf:thanks:
 
Nhờ lấy hộ bài báo:
"Correlation between yield and osmotic adjustment of peas (Pisum sativum L.) under drought stress"
B. Rodríguez-Maribonaa, J. L. Tenorioa, J. R. Condeb and L. Ayerbea
a Dpto. de Producción y Tecnología de Alimentos, CIT, INIA, Apdo. 8111, 280280-, Madrid, Spain
b Dpto. de Fitotecnia, EUITA, Ciudad Universitaria, 28040-, Madrid, Spain


Accepted 21 January 1991. ;
Available online 7 July 2003.

http://www.sciencedirect.com/scienc...f6ad722f3d13c5659b7&ie=/sdarticle.pdf:thanks:

:welcome::welcome::welcome:
 

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