Soluble in Chloroform,Dichloromethane,Ethyl Acetate,DMSO,Acetone,etc.
HS Code Reference
Personal Projective Equipment
For Reference Standard and R&D, Not for Human Use Directly.
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We have employed microprojectiles to deliver genes involved in anthocyanin biosynthesis to cells within intact aleurone and embryo tissues of maize. Clones of the A1 or Bz1 genes were introduced into aleurone tissue that lacked anthocyanins due to mutations of the endogenous A1 or Bz1 gene. Following bombardment, cells within the aleurone developed purple pigmentation, indicating that the mutation in the a1 or bz1 genotypes was corrected by the introduced gene. To analyze the expression of these genes in different genetic backgrounds, chimeric genes containing the 5′ and 3′ regions of the A1 or Bz1 genes fused to a luciferase coding region were constructed. These constructs were introduced into aleurones of genotypes carrying either dominant or recessive alleles of the C1 and R genes, which are known to regulate anthocyanin production. Levels of luciferase activity in permissive backgrounds (C1, R) were 30- to 200-fold greater than those detected in tissue carrying one or both of the recessive alleles (c1, r) of these genes. These results show that genes delivered to intact tissues by microprojectiles are regulated in a manner similar to the endogenous genes. The transfer of genes directly to intact tissues provides a rapid means for analyzing the genetic and tissue-specific regulation of gene expression.
Regulation of anthocyanin biosynthetic genes introduced into intact maize tissues by microprojectiles
Theodore M. Klein, Bradley A. Roth, and Michael E. Fromm
The nerve growth factor (NGF) receptor was characterized by using a new series of anti-receptor monoclonal antibodies (MAbs). These MAbs (i) showed significantly greater reactivity with a melanoma cell line expressing higher levels of NGF receptor, (ii) inhibited the binding of 125I-labeled NGF to its receptor, and (iii) immunoprecipitated both metabolically labeled and 125I-labeled NGF affinity-labeled receptor. These experiments defined the receptor as a 75-kDa cell-surface protein. The NGF receptor was visualized by immunoperoxidase staining in tissue sections of human nevi, melanomas, neurofibromas, a pheochromocytoma, and peripheral nerves. Uniform staining of the cytoplasm suggests that, in addition to cell-surface NGF receptors, there is a population of intracellular receptors.
Characterization of nerve growth factor receptor in neural crest tumors using monoclonal antibodies.
A H Ross, P Grob, M Bothwell, D E Elder, C S Ernst, N Marano, B F Ghrist, C C Slemp, M Herlyn, B Atkinson
Nonadherent (NA), low density (LD), wheat germ agglutinin-positive (WGA+) murine hemopoietic stem cell-enriched preparations (HSCPs) were tested for the capability to reconstitute lymphohemopoietic elements in lethally irradiated mice. HSCPs from BALB/c mice reconstituted lethally irradiated, major histocompatibility complex (MHC)-matched DBA/2 mice to normal histology of the thymus and spleen and normal humoral and cellular immune functions. By contrast, lethally irradiated B6 mice could not be reconstituted after transplantation with NA, LD, WGA+ cells from MHC-mismatched BALB/c mice. We previously observed frequent survival, stable chimerism, and normally vigorous functioning immune systems in B6 mice transplanted with T-cell-depleted bone marrow from both BALB/c and B6 donors. To extend these findings to a stem cell transplantation system, lethally irradiated B6 mice were transplanted with NA, LD, WGA+ cells from both BALB/c and B6 mice. These mixed stem cell-enriched preparations did not reconstitute the lethally irradiated, MHC-mismatched mice. By contrast, such HSCPs from BALB/c plus DBA/2 into DBA/2 mice reconstituted the hematologic and lymphoid tissues and functional immune systems when the donor and the recipient pairs were matched at MHC and mismatched at multiminor histocompatibility barriers. These purified blood progenitors thus appear to lack certain cells/factors essential for engraftment and reconstituting recipients in a fully allogeneic environment.
Lymphohemopoietic reconstitution using wheat germ agglutinin-positive hemopoietic stem cell transplantation within but not across the major histocompatibility antigen barriers.
N S el Badri and R A Good
1993 Jul 15;